什么是精确铸造?

精确铸造是指获得精确铸件的一般术语。与传统的砂铸造过程相比,通过精确铸造获得的铸件具有更精确的尺寸和更好的表面饰面。它的产品精确,复杂,并且接近零件的最终形状。无需处理或处理即可直接使用。这是一个近网状的高级过程。它可以适用于低数量请求订单。

这包括投资铸造,陶瓷铸造,金属铸造,压力铸造,丢失的泡沫铸件。

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。

投资模具是通过使用合适的投资材料(例如石蜡)进行的。在投资模具上重复了难治性涂层和难治性的砂过程。硬化的外壳干燥。然后将内部熔化模具融化以获得空腔。获得了烘烤的外壳以获得足够的强度。剩余的投资材料被烧毁,并倒入所需的金属材料。固化,冷却,炮击,沙子清洁。从而获得高精度成品。根据产品要求,热处理和冷工作和表面处理。

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

接下来是主要的精确铸造过程简介。

什么是精确铸造Processes

Step 1. MOLD DESIGN

什么是精确铸造1

As per the drawing, our engineer will finish the mold design. The mold is purchased from a mold factory.

Step 2. WAX INJECTION

什么是精确铸造2

蜡是由机器注入的。所需铸件的蜡设计是通过注射成型产生的。此过程称为模式。

Step 3 . ASSEMBLY TREE

什么是精确铸造3

图案连接到中央蜡棒,称为浇口,形成铸造簇或组装树。

步骤4.壳制作

什么是精确铸造4

贝壳是通过将组件浸入液体陶瓷浆中,然后进入非常细的沙子来建造的。最多可以以这种方式应用六层。外壳在每一层制造中都会干燥。

Step 5. DEWAX

什么是精确铸造5

陶瓷干燥后,然后加热。蜡将被融化。融化的蜡将从外壳中流出。

Step 6. CASTING

什么是精确铸造6

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.

步骤7.淘汰赛

什么是精确铸造7

当金属冷却和固化时,陶瓷壳将被振动或敲除机折断。

Step 8. CUT OFF

什么是精确铸造8

使用高速摩擦锯将零件从中央云杉切开。

步骤9.研磨

什么是精确铸造9

铸造被切断后。浇铸零件将仔细地面地面。

步骤10.检查和治疗后。

什么是精确铸造10

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

什么是精确铸造11

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.
b。自由收缩率很高,这阻碍了收缩率。

(2)铸造材料的影响。

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.

(3)霉菌制造对铸件收缩的影响。

一种。蜡温度,蜡压和停留时间对熔体尺寸的影响最为明显。然后是蜡压。保留时间对确保注入成型后的最终投资尺寸几乎没有影响。
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.

锆石砂和锆石粉是由于其较小的膨胀系数,仅为4.6×10-6/°C,因此可以忽略它们。

(5) Effect of shell baking.

由于壳的膨胀系数很小,当壳温度为1150°C时,仅为0.053%,因此可以忽略它。

(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.

精确铸件的优点

Perfect-Surface Finish

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.

接近完成的零件设计

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.

Tighter Tolerances

Due to the nature of the process, Investment Castings can be held to much tighter tolerances than sand castings or forgings.

Competitive Tooling Costs

投资铸造工具的初始费用通常比沙铸件的费用便宜。

Thin wall castings

投资铸造过程能够比沙铸件具有更薄的墙壁更可靠的铸件。优势包括由于较薄的墙壁能力,重大的废料率和铸件的重量较小。

不太铸造缺陷

Being a cleaner process than sand molds, investment castings, generally, provide a much higher percentage of defect free-castings.

Typical Precision Casting

精密铸造产品均用于所有工业领域,尤其是电子,化学,能源,运输,光工业,纺织品,药品,医疗设备,泵和阀门。

Precision casting products:
Aluminum casting: general aluminum casting | aluminum box
铜和铝铸件:铜板,铜袖|精密铜铸件
Steel castings: large steel castings | small steel castings | precision steel castings | CDL1 | CGAS | CGKD | CGKA | CGA
Copper and aluminum castings
Ferro Tungsten

中国精密铸造铸造厂

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]