普遍使用的精确铸造是投资铸造，也称为Lost Wax Casting。它被广泛用于生产亚铁和非有产金属铸造。
Additionally, in both design and material choice of castings, Precision castings have huge freedom. It allows many types of steel or alloy steel for investment. So on the casting market, Precision casting is the highest quality castings.
Precision casting also faces a cost of molding and time. Each casting producing, requires a mold and one wax pattern. It will take more time and separate costs. So it is not a good cost-effective for low quantity products.
Precision casting has many process steps, so it will take more time for each casting. If with a flow line to show. It is :
蜡（蜡模） - 修复蜡 - 蜡检查 - 群树（蜡模块树） - 壳（首先糊状，沙子，重新涂层，最后模具空气干燥） - 浸润（蒸汽脱水） - 霉菌烘焙 -化学分析 - 播种（在模具外壳中铸造熔融钢） - 振动炮击 - 铸造和浇注杆的切割和倒入铸造和浇注杆 - 磨牙 - 磨碎的栅极 - 启动检查（毛茸茸的检查） - 拍摄爆炸 - 爆炸 - 抛光 - 抛光 - 抛光 - 固定 - 罚款贮存
Step 1. MOLD DESIGN
As per the drawing, our engineer will finish the mold design. The mold is purchased from a mold factory.
Step 2. WAX INJECTION
Step 3 . ASSEMBLY TREE
Step 5. DEWAX
Step 6. CASTING
In the conventional process, the shell is filled with molten metal by gravity pouring. As the metal cools, the parts and gates, sprue, and pouring cup become solid casting.
Step 8. CUT OFF
The casting will be inspected by the inspector as per the drawing and quality request. If there are unqualified parts. It will be repaired and inspected again.
Step 11. FINISHED CASTINGS
After surface finishing operations, the metal castings become identical to the original wax patterns and are ready for shipment to the customer.
For Precision Investment Casting Process Documents, you can download the精确投资铸造过程PDFas below:
If you are a precision manufacturer, you should know some Influence accuracy factors
Influence accuracy factor
Under normal circumstances, the dimensional accuracy of precision castings is affected by many factors such as the structure of the casting material, molding, shelling, roasting, and casting. Any one of the links set up and unreasonable operation will change the shrinkage rate of the casting. The dimensional accuracy of the casting has deviated from the requirements. The following are factors that can cause defects in the precision of precision castings:
(1) The influence of the structure of the casting.
一种。The casting has a thick wall and a large shrinkage. The casting has a thin wall and a small shrinkage.
一种。The higher the carbon content of the material, the smaller the line shrinkage. The lower the carbon content, the greater the line shrinkage.
b。The casting shrinkage of common materials is as follows: casting shrinkage K = (LM-LJ) / LJ × 100%, LM is the cavity size, and LJ is the casting size. K is affected by the following factors: wax mold K1, casting structure K2, alloy type K3, casting temperature K4.
b。The linear shrinkage of the wax (molding) material is about 0.9-1.1%.
c. When the investment mold is stored, further shrinkage will occur, and the shrinkage value is about 10% of the total shrinkage. However, after 12 hours of storage, the size of the investment was substantially stable.
d. The radial shrinkage of the wax mold is only 30-40% of the shrinkage in the longitudinal direction, and the effect of the wax temperature on the free shrinkage is far greater than the effect on the resistive shrinkage (the optimum wax temperature is 57-59 ° C, The higher the temperature, the greater the shrinkage).
(4) The influence of the shell material.
(5) Effect of shell baking.
(6) The influence of casting temperature.
铸造温度越高,th就越大e shrinkage. The pouring temperature is low and the shrinkage rate is smaller. Therefore, the pouring temperature should be appropriate.
The investment casting process provides a far superior surface finish as compared to forgings and sand castings. Sometimes this is important and can avoid machining or other finishing operations.
投资铸造s provide near net shapes for manufactured parts, thus eliminating or reducing machining costs. Holes, undercuts, slots, and other difficult detail that cannot be had with other processes can often be provided. An added benefit of near net shape is the savings on material, especially with expensive alloys such as nickel and cobalt alloys.
Due to the nature of the process, Investment Castings can be held to much tighter tolerances than sand castings or forgings.
Competitive Tooling Costs
Thin wall castings
Being a cleaner process than sand molds, investment castings, generally, provide a much higher percentage of defect free-castings.
Typical Precision Casting
Precision casting products:
Aluminum casting: general aluminum casting | aluminum box
Steel castings: large steel castings | small steel castings | precision steel castings | CDL1 | CGAS | CGKD | CGKA | CGA
Copper and aluminum castings
We are a China precision casting corporation located in Shandong. With a precision casting process, we can cast nearly 300 alloys. Our metals include stainless steel, tool steel, carbon steel, ductile iron, aluminum, copper, brass, and other alloy steels. Precision casting is suitable for complex and detailed part designs, such as impellers. Because it uses lost wax ceramic shells. Its patterns were injection molded in advance. After pouring, it can be finished. If a more perfect request, it can be made by machining and post-treatment.
With 23 years of history, we have made a range of high-grade investment and precision casting. Our business core is to provide quality precision castings with high working performance. Besides these, we can also provide precision die casting, precision aluminum casting, precision steel casting. We would like to be your reliable supplier for your precision cast parts. Our engineered precision casting department will give you a complete casting proposal about product design, material choice, machining details, etc for your reference.
If you want to get more details about what is precision casting or have precision casting projects needs, kindly contact us freely. email us at[email protected]