Cast production technology for shell

Abstract

The invention discloses cast production technology for a shell. The technology sequentially comprises the steps of: manufacturing a mould, namely manufacturing an external metal mould, wherein the lower part of the external metal mould is provided with a molten iron inlet; manufacturing a sand mould, namely manufacturing a foaming mould, coating cast steel paint on the surface of the foaming mould, filling resin sands into the mould and hardening the sand mould by air blowing; setting a core, namely assembling the sand mould and the external metal mould, wherein a high temperature resistant material is coated on the core; pouring at the temperature of between 1,380 and 1,420 DEG C for 4 to 8 seconds and preserving the heat for 100 to 150 minutes, wherein a product yield reaches 50 to 70 percent; and performing subsequent operation, namely opening the mould to take the cast out, and cleaning and grinding the cast to obtain the required shell. The technology has the advantages of high sand mould quality, difficult cracking, good cooling effect and uniform internal density of the cast.

Description

technical field

[0001] The invention relates to a production method of a shell, in particular to a casting production process of the shell, which is particularly suitable for integral casting of metal shells. Background technique

[0002] The casing mainly refers to the casing of the pump or valve, such as the casing of the gear pump and the globe valve. The shell generally includes a bottom cover, an inner shell and an outer cover in an integrated structure. Since the function of the shell is mainly to protect the parts in the shell from the erosion and influence of the external environment, the shell is required to have strong toughness In addition to strength, it must also have certain corrosion resistance. All of these put forward higher requirements on the manufacturing method of the housing.

[0003] The Chinese patent authorization announcement number is CN100587252C, and the invention patent issued on February 3, 2010 discloses a fluid pump and its casting method. ...