Analysis of the Process of Yihui Casting Vacuum Wax Injection Machine | Wax Mold Forming Equipment for Lost Wax Casting

In the entire process chain of jewelry wax casting, the quality of wax molds directly determines the yield of subsequent castings. If there are problems such as bubbles, shrinkage pits, material shortage, and flying edges in the wax mold, it is difficult to recover the defects in the finished product no matter how the parameters are adjusted in the subsequent casting process. As the mainstream wax mold forming equipment in the jewelry industry, Yihui Casting Vacuum Wax Injection Machine relies on vacuum wax injection technology to stably output high-precision wax parts. It is widely used in wax mold production of gold, K gold, silver jewelry, and cultural and creative jewelry, and is an indispensable pre-processing equipment for jewelry casting factories.

01 Basic physical principles of vacuum wax injection machine

Core of Yihui Casting's vacuum wax injection machine adopts four physical mechanisms: vacuum degassing, constant temperature wax storage, pressure boosting wax injection, and pressure compensation. It is completely different from traditional ordinary pressure wax injection machines and solves the common problems of wax mold bubbles, shrinkage, and material shortage from the source.

Vacuum exhaust mechanism

Before wax injection molding, the equipment automatically extracts vacuum from the mold chamber and mold cavity, thoroughly eliminating dead corners of the internal patterns and residual air in the exhaust groove of the rubber mold, preventing liquid wax from trapping gas during the wax injection process, eliminating pinholes and bubble defects in the wax mold from the root, and ensuring the complete formation of fine threads, micro inlaid claws, and relief patterns.

Principle of Constant Temperature Melting and Wax Storage

Equipment is equipped with an independent constant temperature wax bucket system, which maintains stable liquid flowability of casting wax through precise temperature control, avoiding problems such as dilution shrinkage caused by high wax temperature and insufficient flowability caused by low temperature, ensuring consistent viscosity and stable filling capacity for each wax injection.

Principle of constant pressure filling molding

Using stable compressed air pressure as the driving force, liquid wax is uniformly and smoothly pressed into the mold cavity. Compared with manual wax injection and low-pressure wax injection, the pressure is uniform without dead corners, which can fully fill thin-walled, deep groove, and complex hollow structures. The formed contour is full and the edges are sharp.

Principle of pressure maintenance and shrinkage shaping

Cooling and solidification process of wax liquid will cause volume shrinkage. The equipment continuously stabilizes and maintains pressure, compensates for shrinkage gaps in real time, effectively solves the problems of surface shrinkage pits, local depressions, and shape deformation of wax molds, and ensures the dimensional accuracy and shape regularity of wax molds.

Equipment specific optimization principle

Whole machine adopts a segmented vacuum+pressure program, and the vacuum degree, wax injection pressure, holding time, and wax temperature are all digitally adjustable and can store formulas; Equipped with a silent vacuum system and a constant temperature anti carbonization wax storage structure, the wax material is not easily aged or deteriorated during long-term production, and the batch consistency is extremely strong. It is suitable for long-term standardized mass production of precision jewelry.

02 Complete standard process flow of Yihui vacuum wax injection machine

Entire process loop is standardized, reproducible, and traceable, fully compatible with factory standardized mass production management:

Wax melting constant temperature reserve

Pour the specialized jewelry casting wax into the wax storage bucket, and the equipment will melt at a constant temperature and maintain insulation for a long time. Filter out impurities and coarse particles in the wax to ensure the purity and uniform fluidity of the wax liquid, and prevent impurities from causing black spots and pockmarks on the wax mold.

Mold inspection and mold clamping

Check the integrity of the rubber mold, the smoothness of the exhaust groove, and clean the dust and residue inside the mold; Accurately aligning and locking the mold to prevent wax running, flying edges, and misalignment deformation during high-pressure wax injection.

Sealed and vacuumed warehouse body

Close the molding chamber door, start the vacuum system to extract air from the mold cavity, empty the gaps and dead corners of the mold, and provide molding conditions for bubble free filling.

Constant pressure high-speed wax injection molding

According to the preset pressure parameters of the style, the liquid wax is uniformly pressed into the mold to completely fill the cavity. The pressure gradient of complex and thin-walled parts is adapted to ensure that the patterns, hollows, and fine claws are fully filled.

Stabilize and maintain pressure, supplement and shrink cooling

Maintain a constant pressure for static cooling, compensate for the solidification shrinkage of the wax material, avoid surface collapse and shape deformation, and ensure the dimensional accuracy and surface flatness of the wax mold.

Relieve pressure, open the mold, take and repair parts

Automatic pressure relief after molding is completed, open the mold to remove the complete wax mold, trim the water nozzle, flash edge, and excess material edge, and check the appearance for no bubbles, deformation, or missing materials.

Wax pattern sorting and process flow

Good products are uniformly stored for future use, defective products are separately removed and reworked, and qualified wax molds are sent to the assembly, gypsum casting, roasting and wax removal processes to complete the pre casting closed loop.

03 Core process characteristics of Yihui vacuum wax injection machine

（1） Core process advantages

Vacuum degassing is thorough, resulting in a significant increase in the yield of wax molds

Vacuum environment eliminates gas entrapment during molding, completely solving the problems of internal bubbles and surface pinholes that occur frequently in ordinary wax injection machines. High precision styles such as filigree, micro inlay, and retro relief have extremely strong molding stability, reducing the scrap rate of castings from the source.

High degree of detail restoration, stable molding of complex styles

Constant pressure filling has uniform thrust and sufficient fluidity, which can stably form 0.2mm thin-walled structures, fine patterns, and multi-layer hollow jewelry with clear contours and regular edges, without the need for manual waxing and shaping.

Excellent pressure retention and shrinkage compensation, uniform dimensional accuracy

The cooling process stabilizes and compensates for shrinkage, effectively offsetting the solidification shrinkage of wax materials, preventing shrinkage pits, dents, and deformations. The size deviation of wax molds in the same batch is extremely small, and the batch casting specifications are uniform and the quality is stable.

Fully digital and controllable parameters, free from manual dependence

Wax temperature, vacuum degree, wax injection pressure, and holding time can all store formulas, and different styles can be called up with one click. Newcomers can standardize their operations, completely solving the quality fluctuations caused by differences in the techniques of experienced craftsmen.

Low wax material loss and anti carbonization aging

Accurate constant temperature wax storage system, avoiding over temperature burning of wax, carbonization and blackening of wax materials, extending the service life of wax materials, reducing consumable costs, and achieving significant long-term economic benefits in mass production.

Multi scenario adaptation, highly versatile

Compatible with all types of jewelry wax materials, including soft wax and hard wax, suitable for small batch sampling, customized development, and large-scale currency production. Perfectly compatible with centrifugal casting and vacuum casting equipment, suitable for the entire wax loss casting production line.

04 Provide one-stop casting solutions

As the first source process of lost wax casting, wax casting quality is the core cornerstone that determines the yield, stability, and detail expression of castings. The Yihui vacuum wax injection machine has four technical advantages, including vacuum degassing and bubble removal, constant temperature stable wax storage, constant pressure precise filling, and stable pressure shrinkage and shaping. It completely solves the industry pain points of traditional ordinary wax injection, such as many bubbles, large shrinkage pits, poor texture, unstable batches, and dependence on experienced hands.

Yihui Casting Technology Co., Ltd. was established in 2003. After more than 20 years of accumulation, Yihui has now developed into a national high-tech enterprise that integrates research and development, production, sales, consulting, installation, and training of lost wax casting equipment, and provides one-stop solutions for metal casting. Yihui Casting Technology products include metal casting equipment, casting wax, graphite products, quartz products, etc., which are exported to Southeast Asia, the Middle East, Europe, America and other regions.Company has its own R&D team, which independently develops and produces automated vacuum die-casting machines, G20 vacuum bead scattering machines, and intelligent system D5 vacuum pressure casting machines, breaking the industry's long-standing dependence on imported high-performance jewelry equipment.

For more information about Yihui Casting Technology Co., Ltd., please visit our official website or contact our team.

website: www.yihuicasting.com      email : info@yihuicasting.com     whatsapp : +86-13802830498