Vacuum Casting Alloy Steel Casting Parts

Cast Alloy Draft Gear Housing

A alloy draw gear (also known as a alloy draft gear) is the assembly behind the coupling at each end of the wagon to take care of the compression and tension forces between the wagons of trains. The draft gear housing’s job is to protect the railcar by absorbing the energy associated with pushing, pulling, starting, stopping, and coupling of railcars.

OEM & ODM Draft Gear Housings for Train Industry from Hengchang Foundry

We use vacuum casting process to produce custom railway darft gear. Vacuum casting is a casting process for elastomers using a vacuum to draw the liquid material into the mold. This process is used when air entrapment is a problem, there are intricate details or undercut, or if the material is fiber or wire  reinforced.

Advantages of Vacuum Casting Process

1)The casting has high dimensional accuracy, clear outline and smooth surface.

● The surface of the inner cavity of the mold is covered with plastic film, and the surface of the mold is smooth and flawless.

● The internal and external pressure difference of the sand mold makes the hardness of each part of the sand mold uniform and high (more than 85).

● The sand box is easy to remove the mold, and the draft angle is small (0 ～ -1 °).

● The cavity is not easily deformed by the heat of the molten metal.

● During pouring, the vacuum of the flask is favorable for filling the cavity with metal liquid.

2)High metal utilization

● Because the surface of the vacuum casting is smooth, the dimensional accuracy is high, and the machining allowance of the casting is small.

● Due to the slower cooling rate of the metal liquid in the cavity, which is conducive to the replenishment of the metal, the riser of the casting can be reduced and the utilization rate of the metal can be increased. The steel casting can be increased by 20%, and the cast iron can be increased by 25%.

3)Simple equipment and low investment

Due to the vacuum molding, in addition to the need to add a vacuum pump and a special sand box, other equipment is relatively simple, can eliminate the sand mixer and some auxiliary equipment, less investment costs, and convenient equipment maintenance.

4)Saving raw materials and power

Due to the use of dry sand in vacuum casting, falling sand is easy, and the sand recovery rate can reach more than 95%. The power consumed by the V method is less, only 60% of the wet method, which can reduce labor by 35%.

5) Pattern and flask long service life

Because the appearance is protected by a plastic film, the drafting force is very small, it is only slightly shaken and is not affected by high temperature and high pressure, so the appearance is not easy to deform and damage.

6)Improve the working environment

● Most of the trace gases generated during the molding and pouring process are removed by the vacuum pump, and the air pollution is small.

● After falling sand, there is no large amount of waste sand treatment.

7) Easy to manage and organize production

Vacuum casting has a short production cycle, simple process and easy operation, and does not require very skilled technical workers.

8)Wider scope of application

● Vacuum casting is suitable for small batch production of single pieces by manual operation, as well as large-scale production of mechanized automation.

● Can be used for ferrous metals such as cast iron and cast steel, as well as non-ferrous metals such as copper, aluminum and magnesium.

Vacuum Casting Materials:

• Carbon Steel: Low Carbon Steel, Medium Carbon Steel and High Carbon Steel from AISI 1020 to AISI 1060.• Cast Steel Alloys: ZG20SiMn, ZG30SiMn, ZG30CrMo, ZG35CrMo, ZG35SiMn, ZG35CrMnSi, ZG40Mn, ZG40Cr, ZG42Cr, ZG42CrMo...etc on request.
• Stainless Steel: AISI 304, AISI 304L, AISI 316, AISI 316L and other stainless steel grade.
• Other Materials and Standards on request

Product detail

Our Advantages in Sand Casting Field:

• Over 15 years of experience in sand casting, shell molding casting and machining technology.
• Dimensionally accurate cores for complex internal contours.
• Strictly control the raw materials.
• Quality management throughout the production process and maximum process reliability.

Zhangzhou Hengchang Machinery Manufacturing Co.,Ltd workshop