Lost wax casting process is one of the most effective production methods for jewelry casting. Regarded by numerous experts as a highly efficient method, its dominance in the creation of custom jewelry, such as rings, bracelets, and pendants can be seconded to none.
Vacuum pressure jewelry casting equipment is among the many lost wax casting methods that have propelled lost wax casting usage in the industry. Hundreds of renowned jewelry manufacturers fancy using a vacuum pressurized lost wax casting machine in casting metals such as pure gold, silver, copper, platinum, etc.
It’s of importance to note that casting jewelry via the traditional jewelry casting methods would easily leave you with finished piece prone to oxidation, bubbles, and cracks— making the post-casting process extremely cumbersome.
The vacuum pressure casting process, on the other hand, operates in a closed environment. This ensures that you do not have to worry about oxidation, densification, shrinkage, or porosity of the final product. Vacuum casting method provides high dimensional accuracy and excellent surface finish. Suitable for casting complex-shaped Jewelry, small holes, and thin-walled Jewelry.
Jewelry casting, also known as lost wax jewelry casting or investment casting, which refers to casting metal or alloy into a plaster mold with a designed size and style by heating and melting. After solidification, a complete jewelry shape or processed blank can be obtained.
Jewelry casting is most used in the jewelry manufacturing industry because of its high production efficiency and variety of styles.
Jewelry casting process includes design, sprue welding, wax tree making, gypsum slurry injection, vacuum treatment, wax burnout, metal casting, cleaning in water, sprue removal, and polishing.
For these steps, SuperbMelt has continuously developed casting equipment for jewelry to suitable for different customer needs.
Step 1: Making Wax Mold
Wax pattern technology is mainly used in jewelry mold making, it is used to form the cavity shape of the final casting. The methods of carve and shape wax include manual wax carving and 3D printing. Manual wax carving needs to carve the shape of jewelry on two regular pieces of wood, or directly carve a piece of wax into the shape of a jewelry.
3D wax printer is currently the most popular tool creating a precise wax or resin, It can print castable and uncastable materials, such as white wax and resin, which are all castable materials, send the design to the computer, and then the 3D printer will automatically print out the model, which can be used for direct casting.
It is also possible to use uncastable materials to make rubber molds, and then use automatic wax injection machines to reproduce them to achieve mass production.
Step 2: Making Wax Mold Tree
The production of the wax tree is to attach sprues and base making individual jewelry pieces on the same wax stick. At this step, it is necessary to clearly understand the movement rules of the metal liquid, and the wax trees planted according to reasonable rules will be more precise.
It is also necessary to consider the interval of the wax model. If the interval is too large, it will cause waste, and if the interval is too small, it will cause the plaster cavity to crack.
Step 3: Making Plaster Mold
In this step, the mold for making jewelry is obtained by solidifying the gypsum slurry, First of all, the ratio of powder and water needs to be adjusted. The common method is to stir the powder first and then put it into a vacuum machine for vacuum treatment.
This step is to avoid air bubbles and water droplets in the powder slurry, which will cause defects in the finished jewelry. some air will also be injected during pouring into the jewelry flask, so it needs to be vacuumed again.
Such a method is cumbersome and complicated. Therefore, SuperbMelt has developed a vacuum powder mixing machine, which integrates mixing, powder injection, vacuuming, and a vibration function, which makes the mold smooth and greatly improves production efficiency.
Step 4: Burning Wax
This step is to making wax burnout, and then get the plaster cavity. This step determines whether the subsequent casting can proceed normally, so temperature adjustment is very important.
In addition to melting the wax casting tree, heating can also increase the hardness of the gypsum shell and make the temperature of the shell close to the melting temperature, so as to avoid the formation of defects and blisters due to the rapid cooling of the metal.
Our wax burning equipment can be burn cycle, avoiding the damage of residual wax to the environment and employees.
Step 5: Metal Melting & Casting
The traditional way is to directly expose the metal to the air and melt it, and then pour it into a plaster mold. This method has a greater potential safety hazard, and with the entry of air, the quality of the workpiece will not be very high.
Using the SuperbMelt vacuum casting machine, melting and pouring can be integrated, and the whole process is in a vacuum environment, which makes the finished jewelry smooth and precise.
The temperature of the machine can reach 1600 degrees Celsius. When melting gold, silver, copper and other metals, the speed is faster, and the casting efficiency is higher. Under the action of gravity, the filling of the mold is more complete and defect-free.
It is recommended to use a centrifugal casting machine to obtain a better finished product.
Step 6: Cleaning the Casting
After cleaning the gypsum powder in this step, you can get the finished jewelry or rough embryo for further processing. Let the casted plaster mold rest for a few minutes, then put it in a bucket to cool and rinse it. Avoid putting it in water immediately, because it is easy to break and damage the casting, but it should not be too late, otherwise the plaster will be difficult to separate.
After the gypsum is detached, the branches can be cut off, and the impurities on the surface can be cleaned again, and finally the cut marks can be smoothed by polishing.
Step 7: Quality Control
Finally, the quality inspection of the casting is required. According to the relevant jewelry standards, the drawings to check whether there are defects on the surface of the casting, incomplete cleaning, roughness, etc., and whether there is any deviation in the accuracy of the size, quality and shape.
Generally, it is inspected with the naked eye, and a 10x magnifying glass is required if necessary.
Gold is popular in jewelry because it does not rust and lasts for a long time. Gold is advantageous for casting because of its relatively low melting point and its malleable properties.
Now, many jewelry on the market are actually gold alloys, that is, K gold with various gold contents. When casting gold with different purity, the temperature required is also different. For exsample pure gold, when heated to 1200 degrees, It already has strong fluidity, so it can make the casting complete without defects.
Some intricate bracelets can be easily made with our vacuum casting machines.
Silver Casting
Sterling silver has a very beautiful luster, and the casting process of sterling silver will be more difficult and requires the assistance of flux.
Blowhole is the most likely problem in silver casting. At the same time, silver is prone to rapid oxidation at high temperature, so the heating temperature of the plaster mold is critical, and the casting process needs to be in a vacuum environment.
Most silver jewelry on the market is actually an alloy of silver and copper, as they combine to melt at a lower temperature, but the finished product is stronger and more durable.
Platinum Casting
Nowadays, platinum is widely used in the jewelry industry because of its shining color. Jewelry manufacturers are keen to use it to make wedding rings, diamond rings, etc. Due to its relatively high melting point, it is easy to cool rapidly during the casting process, so it is likely to stick to the quartz cup, resulting in a large loss of material.
In order to solve this situation, we have developed an excellent jewelry casting equipment for platinum, the mini jewelry casting machine, which is often used by our customers to make platinum rings, because it is in a vacuum environment, and the finished product is very perfect.
Chapter 2:
How to Choose the Best jewelry Casting Equipment
When it comes to jewelry casting, the type of method you chose to use is of utmost importance. Unlike most other notable casting processes, Jewelry casting requires strict adherence and care. Mistakes or negligence during casting can cost you a fortune. While our FAQ section is designed to help you scale through each time you come across a blockade while casting, taking out time to ensure that you are on track during the process would save you a lot of hassle and stress.
Here are a Few Things to Consider before Choosing a Jewelry Casting Method
Suitable Casting Material: no individual would fancy going through the hectic process of casting to end up with a piece of jewelry with little to no strength or resistance to corrosion. Selecting the right alloy would require checking out the shape, size, texture and weight.
Specific Product Requirements: before diving in jewelry casting, you would have to make up your mind as to what you would like the end product to look like. Whether you are trying to cast a piece of jewelry for yourself or you have a huge customer base at your wake, operating without accessing the product requirement and specifications can lead to miscalculations in the metal casting process.
Project/Tool Cost: the type of jewelry casting machine required is dependent on the casting method. Jewelry casting is an expensive venture, to ensure that you don’t end up at the losing end, it’s essential an estimate on the project cost is carried out before the casting process begins.
Wax Casting: Amongst all the notable casting techniques that renowned jewelry casting experts have used in creating jewelrys since time inception, Wax casting technique is among the few that have been able to withstand the test of time.
Wax casting ring technique utilises a wax model of a specific object in creating the mold. After the creation of the mold, molten metal is poured into the created mold to produce a sculpture. Wax casting influential position in creating small jewelry settings of any shape and size have made it one of the most sought out casting technique of all time.
While there are tons of notable wax casting methods available, we would focus on the two jewelry wax casting methods operating with the lost wax casting jewelry {investment casting} technique ‘Vacuum casting method and Centrifugal casting method’.
Designed to enable users enjoy a stress-free process and well-polished jewelry designs, hundreds of notable jewelry casting companies utilise the productive influence that the above-listed jewelry casting methods provides.
Since we are familiar with all the facts attached to wax casting, lets jump into the casting methods and processes involved.
2.1, Vacuum casting method
Vacuum casting method involves the usage of vacuum casting machines to suck the molten metal into the mold. Functioning with almost the same tool and procedures as centrifugal, the vacuum lost wax casting method is notable for its requirement for the flask to be loaded in a sleeve within a chamber to enable the forced vacuum to inhale molten metal into the investment.
Tools required for Vacuum Casting
Pattern Wax: pattern wax are completely combustible materials that can be filled with soluble wax for hollow forms. Operating with a material void of this form would leave room for residue which is quite detrimental to the casting process.
Sprue wax:this is a wax used in attaching sprue to the main sprue tree.
Investment: adequate investment supply suitable for one to six-month casting project. Endeavour to apply hand lotion before using bare hands to mix investment.
Scale: a laboratory scale that can be used in weighing the size of metal, wax and investment needed for the job.
A Mixer: substantial mixing equipment for mixing the investment. A bowl and scoop would also suffice.
De-bubblizer:a vibrating platform capable of eliminating bubbles within the model and investment.
Burn out oven:a furnace system for heating the wax and investment.
Torch: Oxygen/Acetylene torch capable of melting metals.
Eye protection: a dark eye ware capable of keeping your eyes at a safe distance away from the lightning-caused by the torch.
Heat resistant gloves and tongs: you don’t want to use your hands in removing heated up flask. Heat resistant gloves and tongs provide speed and increase efficiency.
Crucible:a cubicle big enough to hold as much molten metal as desired for the casting process.
Stirring rod: suitable object such as carbon rod for stirring melted metal and for removing impurities.
Flux:Borax powder or any suitable flux for cleaning the flask after burn out.
Gallons of Water:used in cooling off the flask after finalising the casting process.
Fire extinguisher:in case of any unnecessary burn out that may occur.
Vacuum casting machine
Known for its ability to produce big series of functional materials, the first step in vacuum casting is placing a two-piece mold in a vacuum chamber. After the vacuum chamber absolves the mold, the end product is solidified in an oven.
Utilizing this prototyping method would ensure that you get to enjoy a small number of polyurethane prototype parts with highly accurate results.
Unlike most other jewelry casting methods, vacuum casting possesses a shorter production time. vacuum casting machines are a bit expensive but purchasing any would ensure that you don’t have to go through the rigorous balancing procedure that the other lost wax casting rings method requires.
2.2, Centrifugal casting method
Centrifugal casting method has been at the forefront of the casting industry for hundreds of years. The first centrifugal casting machines dates back to 1807. Generally known for casting hollow pipes and tubes, the smooth and efficient casting style involved has been inculcated into wax jewelry casting.
Centrifugal jewelry casting process involves the use of the centrifuge force to create inertia capable of distributing metal into the hollow cavity. Designed with a flask placed in a cradle on a swing arm in direct alignment with a crucible, the melted burn out produced from the hollow cavity is dependent on the heat frequency, induction and the torch used in melting the metal. After a maximum melting point has been attained, the inertia reduces and the burnout is poured into the flask.
Tools Required for Centrifugal Casting
Pattern Wax: pattern wax are completely combustible materials that can be filled with soluble wax for hollow forms. Operating with a material void of this form would leave room for residue which is quite detrimental to the casting process.
Sprue wax: this is a wax used in attaching sprue to the main sprue tree.
Sprue bases and flask: a flask big enough to carry the mold when placed in the furnace system.
Investment: adequate investment supply suitable for one to six-month casting project. Endeavour to apply hand lotion before using bare hands to mix investment.
Scale: a laboratory scale that can be used in weighing the size of metal, wax and investment needed for the job.
A Hand Mixer: substantial mixing equipment for mixing the investment. A bowl and scoop would also suffice.
De-bubblizer: a vibrating platform capable of eliminating bubbles within the model and investment.
Burn out oven: a furnace system for heating the wax and investment.
Torch: Oxygen/Acetylene torch capable of melting metals.
Eye protection: a dark eye ware capable of keeping your eyes at a safe distance away from the lightning-caused by the torch.
Heat resistant gloves and tongs: you don’t want to use your hands in removing heated up flask. Heat resistant gloves and tongs provide speed and increase efficiency.
Crucible: a cubicle big enough to hold as much molten metal as desired for the casting process.
Stirring rod: suitable object such as carbon rod for stirring melted metal and for removing impurities.
Flux: Borax powder or any suitable flux for cleaning the flask after burn out.
Gallons of Water: used in cooling off the flask after finalizing the casting process.
Fire extinguisher: in case of any unnecessary burn out that may occur.
Centrifugal casting machine
The casting process attached to using the centrifugal lost wax casting rings is dependent on the surface tension of the molten metal. Casting delicate metals would require more force to enable the machine to create durable molds.
When making use of centrifugal casting method, keeping a tab on the force been exacted by the centrifuge when creating a mold is of utmost importance. Excessive force can cause damage to the hollow cavity while too little wouldn’t be able to fill up tiny areas of the mold.
Centrifugal machines require the usage of a protective fence to ensure that molten metal doesn’t escape in situations where blow out occurs. While learning how to cast jewelry using the centrifugal method, adhering to the instructions listed below would enable you to avoid casting with flasks that are off-balance.
Insert the investment into the centrifugal machine {not burnout}
Slide the cubicle to the mold and insert the required amount of metal for the flask into it.
Endeavour to keep the centre nut loosened to avoid screeching.
Make a preferred adjustment to the counter-balance weights
Ensure that the weight nut is well tightened.
2.3, Other traditional casting methods
Lost wax casting might have been able to garner a reputable number of individuals and companies to its casting methods but it isn’t all there is. The other notable casting processes available are plaster mold casting and sand casting.
Sand Casting
You wouldn’t find a better casting method for casting small molds at a profitable cost. Sand casting has been in use since the dawn of ancient Egypt. Its reliance on silica-based materials enables users to gain access to a casting process void of tearing and cracking. With the inclusion of clay to the sand casting process, a durable amount of flexibility during the cooling phase is obtainable.
Sand casting does not provide much room for the creation of ornaments and jewelrys like investment casting. Its credibility is widely acknowledged in the automotive and housing industry. Amongst all the traditional casting methods available, sand casting is the most cost-effective and suitable casting method for casting ferrous and non-ferrous materials.
Sand casting, on the other hand, is a bit unreliable in terms of accuracy. Gaining accurate measurements while casting components with specified size and weights can keep you at its wheels all day. Sand casting process bounds objects together using clays, chemical binders, or polymerized oils. Sand casting does not require as much maintenance as other casting methods.
Plaster Mold Casting
Sand casting and plaster mold casting shares a similar process. The major difference between the two-casting process is the mold material being used. Plaster mold casting utilises gypsum, strengthening compound, and water.
This casting process also requires the use of anti-adhesive compounds. These compounds are coated around the pattern to avoid stockage with the mold and to fill up cracks that might occur during casting.
While the plaster mold casting method does not provide wax molds for casting jewelry, the method is a bit cost-efficient for casting large molds. Plaster mold casting provides users with a smoother and more accurate surface than sand casting.
The casting technique can only be used with low melting point non-ferrous materials. Plaster mold method is termed expensive by most casting companies due to the high cost of maintenance it possesses.
2.4, Comparison of multiple casting methods
Casting method
Advantages
Disadvantages
Uses
Burn out cycle
Vacuum casting method
Short production time.
Notable degree of accuracy.
Smooth surface finish.
A bit expensive.
jewelrys, pipes, flywheels, cylinder liners.
1600° F for 12 to 16 hours
Centrifugal casting method
A high degree of accuracy.
Capable of creating tiny wall parts with accurate geometrics.
Extremely smooth surface finish.
Quite expensive.
jewelry, pipes, flywheels, cylinder liners.
1600° F for 12 to 16 hours
Sand casting method
Little requirement for maintenance. Can be easily recycled.
Suitable for casting ferrous and non-ferrous materials.
Low accuracy level.
Creates products with a rough surface finish.
Automotive and housing equipment.
Less than a week
Plaster mold casting method
Smooth surface finish.
Can cast surface shape with thin walls.
Better dimensional accuracy than sand casting
Quite expensive
High requirement for maintenance
Casting equipment of complex geometry
Less than a week
Chapter 3:
How does SuperbMelt’s Vacuum Casting Process Solve the Problems Caused by The Casting Process
Superbmelt is designed to provide a one-stop casting service for your precious metal casting line. Known for our reputability with numerous famous brands, our machines are pack filled with features capable of providing an exceptional casting experience to individuals and companies.
With loads of jewelry casting equipment for sale, a 24 hours support service and a professional R&D team to enable us to keep up with the ever-changing pace of the digital world, you can expect reliability at its peak from the services we provide.
3.1, Air Entrapment in Wax
Air entrapment in wax patterns is one of the causes of casting defects in jewelry. Once the wax model has air inclusions, it may cause air bubbles to form inside the jewelry structure, causing breakage and reducing the texture.
Air of wax entrapment usually occurs for two reasons:
When the wax is injected into the mold, the flow rate is too fast, creating turbulence and air bubbles. Therefore the speed of wax injection into the mold should be reduced, and the diameter of wax injection can also be increased. At the same time, the durability of the mold ventilation system needs to be enhanced.
It could also be that the furnace system is not in optimal condition, so the gaskets and other parts of the furnace system will need to be cleaned periodically.
3.2, Wrinkled Surface
Wrinkling on the jewelry surface has a lot to do with the quality and placement of the plaster flask.
Good quality investment powder is a necessary condition, and attention should be paid to the time and temperature of firing to reduce the deformation of the investment mold.
The melting furnace wall is the place with the highest temperature, so avoid placing the flask too close to the furnace wall, and try to place it in the middle to ensure that the flask will not be heated unevenly during the melting process.
When there is a slight wrinkle, it can be solved by polishing and grinding in the later stage.
3.3, Wax Tree Defects
The delicacy of the finished jewelry is also affected by the perfection of the wax tree.
The connection points of the wax tree must be smooth and seamless, and there should be no wrinkling. If the connection parts are not fine enough, the finished product will be rough, and more time and cost will be spent on polishing and grinding in the later stage. When there are too obvious defects in the tree planting process, the wax should be melted directly and the wax tree should be replanted.
Another thing to consider is the spacing when making wax tree, avoid being too close to the flask, otherwise it will cause high temperature to break the workpiece and cause defects. The mechanical properties need to be considered when connecting, so that the molten metal can pass through each channel smoothly to avoid incompleteness, deformation and shrinkage.
3.4, Burning Wax Defects
In order to make the finished jewelry with high precision and completeness, the wax burning step needs to be precise.
When burning wax, avoid wax residue, otherwise the wax will solidify and leave watermarks, and when pouring, it will cause style defects, and you may get a finished product without texture. .
Therefore, we can use our wax burning machine, which has a secondary combustion function, which can melt the wax more thoroughly and avoid this problem.
3.5, Melting Temperature
It is also very important to control the temperature of the molten metal. If the temperature of the molten metal is too low or the insulation of the flask is not enough, it will cause the phenomenon of shrinkage cavity and loss of the metal workpiece when the molten metal is cooled too fast during the casting process.
At the same time, if the next step of washing is carried out too early, the internal stress will be increased, which may cause cracks in the metal workpiece, so the washing time also needs to be precisely controlled.
3.6, Excessive Stress
During the casting process, it is necessary to precisely control the pressure, only apply the required force, and avoid applying unnecessary pressure to the material, otherwise it will cause cracks in the workpiece.
Although cracks can be resolved by polishing and cleaning, this will take more time and effort, so it should be done in one step during casting, so that jewelry production can be completed more efficiently.
3.7, Inclusion Defect
Inclusions are a common problem in jewelry casting and generally occur during pouring, investment mixing and making wax tree. The generation of inclusions can easily make bad effect of the jewelry. Even if he can remove it, it will leave an obvious pores. This kind of problem cannot be solved by polishing.
Therefore, when selecting materials, high-purity metals should be used, and they need to be poured under the protection of vacuum and inert gas. The medium and high frequency induction furnace of SuperbMelt can handle it well, and its melting speed is fast and the whole process is in a vacuum environment. At the same time, the use of large amounts of flux should also be avoided, so as not to cause the metal to react with air to form impurities.
3.8, Pins Defect
Although the production of investment mold is very simple, it is also the key to whether the casting product can have good results. Increasing pressure during investment may lead to pin defects. The use of bad quality investment materials should be avoided.
Pins is generally produced at the bottom of the flask with the highest pressure and the edge of the workpiece, which will leave a very rough surface on the jewelry. Therefore, attention should be paid to the step of making the investment mold, and the water-powder ratio and mixing time of the investment mold should be accurate.
Chapter 4:
Conclusion
Jewelry casting dates as far back as 700 BC. Since its inception, hundreds of notable jewelry rings casting process has been created. Metals such as gold, silver and platinum are widely regarded as the best material for casting a fine piece of jewelry due to their malleability and rarity on the earth crust.
Whether you fancy the traditional jewelry casting process contained in this piece or the renowned vacuum pressurized jewellery casting machine and lost wax casting equipment we proffer is seeming like the perfect option, there are two must-haves ‘Time and Money’. Jewelry casting is a strenuous job, without adequate preparation and investment, exploring the profitability the craft offers would be impossible.
Chapter 5:
FAQs
What are the probable causes of small bubbles on casting?
When the investment is too vicious; 2. When the working time allocated to the investment to degas flask is too short; 3. When bubbles are trapped against the pattern.
Is there a dedicated time attached to mixing the investment and preparing the mold?
No specific time is dedicated to mixing the investment, although, if you would like to enjoy a smooth and clean casting process, it’s essential you utilise a powder mixer while mixing the investment.
How do I remove the porous surface on casting?
To remove the porous surface on casting, add reservoirs to the sprue tree.
Why am I having a pitted surface after casting?
Pitted surface is caused by the ash residue that results from incomplete burnout.
Apart from a wax heat pen, what other viable alternatives are available in joining a print to a wax tree?
In scenarios where the pattern is too fragile for a wax heat pen, you can use a fast setting epoxy or super glue in sticking print to the wax tree.
What are the effects of metal flashing in a mold?
Metal flashing can cause the investment to become weak thereby becoming cracked or damaged during burnout.
How can I remove Jagged blobs on casting?
There are a few things you can try out when jagged blobs are formed on casting. Some of the notable solutions are decreasing the amount of water during investment, increased the required bench set time after investment, create larger spacings between resin patterns.
Are they homemade methods for polishing a piece of fine jewellery?
There are a few homemade methods available for polishing fine jewelry. To get detailed instructions on all the processes required, you can check out this piece.
What is lost wax jewelry casting?
Lost wax jewelry casting is the process of creating a duplicate metal sculpture from the original. It’s notable for the precision it provides.
What is casting wax used for?
Casting wax is required when designing a fine piece of jewelry. After wax casting occurs, the liquified material is poured into a mold which is then left to form a solidified material.
What type of wax is used for investment casting?
Different types of wax can be used for investment casting. The preferred choice is dependent on the part of the wax pattern on which you are working on. The available wax are Filled Pattern waxes Un-filled or Non-filled Pattern waxes, Runner waxes, Water-soluble waxes, Repair Waxes and Sticky waxes
What materials can be used for casting?
The material that can be used for metal casting includes Titanium alloy, Gray iron, Aluminum alloy, Steel, Copper and Zinc.
Is investment casting expensive?
Compared to most other forms of casting, investment casting is a bit expensive. Note that most other forms of casting cannot provide you with the smooth surface finish and mechanical properties that investment casting provides.
Why is it called the lost wax method?
Investment casting is also known as lost wax casting, because in the beginning wax model is created as per your desired casting pattern, then the liquid metal is inserted into the mold and the wax model is melted and wipe-out. The metal gets harden and get the desired shape similar to casting pattern.
What are the advantages of investment casting?
The major advantage of investment casting is that unlike in traditional casting procedures were the molten metal depends on gravity to flow into the cavities of the mold, investment casting ensures that the molten metal is forced into the cavities of the mold with either centrifugal force or the vacuum casting method.
What is vacuum casting process?
Vacuum casting process is a technique whereby vacuum is used to draw the liquid material into the mold. This process is used when air entrapment is a problem, there are intricate details or undercuts, or if the material is fibre or wire reinforced.
What is shrinkage allowance in casting?
Shrinkage allowance in casting is known as a time during casting whereby the material in use shrinks {reduces in dimension and volume}. Shrinkage allowance taking place during the first two stages of casting is called liquid shrinkage while shrinkage during the third stage is known as solid shrinkage.
What is the difference between mold and cast?
A mold is an impression of an object or organism while a cast can be seen as the final step that follows after the mold. Notable known as two distinct processes in jewelry making, for only after the creation of a mold do you get to cast.
What materials can be used as molds for pewter casting?
The materials required for making a mold during pewter casting include Object to cast, Small box, Sulfur free clay, RTV rubber, Mold release spray, Liquid pewter and Baby powder.
Is that Possible to Cast with Stone?
Yes, you could cast with stone in our casting machine.
© Copyright 2008-2021 Superb Electromachinery Co., Limited