CN102152073A - Process for manufacturing reduction shell - Google Patents

Abstract

The invention discloses a process for manufacturing a reduction shell. The process comprises the following steps of: A, manufacturing a precision aluminum die; B, injecting liquid paraffin at a certain temperature into the die through a paraffin injector so as to obtain a paraffin die; C, repeatedly performing coating and sand drenching on the paraffin die, and hardening the profiled shell and drying; D, dewaxing to obtain a cavity; E, roasting the profiled shell; F, smelting molten steel by using a middle-frequency sensing furnace; G, pouring the molten steel into the roasted profiled shell; H, removing the profiled shell, cutting away the casting head, clearing the sands and polishing so as to obtain a blank; I, performing corresponding thermal treatment on the blank; and J, machining the blank so as to obtain a high-precision product. By the adoption of a silicon sol precision steel casting technology, the appearance of a workpiece is flat and smooth, so polishing is not needed; and the reduction shell has high strength, plasticity and flexibility. The shortcomings that the products in the same type are easy to crack and cannot be repaired and the size precision cannot be guaranteed are basically overcome; therefore, trucks are safer and more stable and reliable under the condition of a heavy load.

Description

A kind of shell production process that subtracts

Affiliated technical field

The invention belongs to automotive field, particularly relate to a kind of shell production process that subtracts.

Background technology

It is numerous to subtract the domestic and international manufacturer of shell at present, and it is similar that each manufacturer production subtracts shell, and structure seems to be, and all adopts the spheroidal graphite cast-iron casting to form.Because spheroidal graphite cast-iron phosphorus content height, plasticity is poor, and its mechanical performance, weldability are relatively poor, occur crackle easily and cause defectives such as leakage of oil in the process of using.Owing to welding performance is poor, spoken parts in traditional operas and hardened structure, the crackle that welds the continuous broad of the easy formation in back is inclined to greatly, case hardness is too high, therefore exists the product of crackle to repair to some.Poor for having solved in the cast iron retrospective, a series of shortcomings such as welding difficulty must be explored other improved production and make processing technology.

Summary of the invention

In order to overcome above shortcoming and to realize above-mentioned purpose, what the object of the invention was to provide a kind of improvement subtracts the shell production process.

According to the technical solution used in the present invention, a kind of shell production process preparation method that subtracts comprises the steps.

A, make accurate aluminum dipping form;

B, the liquid paraffin of uniform temperature is injected mould by wax injector, obtain wax-pattern;

C, on wax-pattern, repeat coating and drench sand and harden shell and drying;

D, dewaxing obtain die cavity;

E, roasting shell;

F, employing intermediate frequency furnace melting molten steel;

G, with pouring molten steel in the good shell of roasting;

Behind H, the place to go shell, prescind dead head and sand removal, ball blast, obtain blank;

I, blank is carried out corresponding heat treatment;

J, blank is carried out machining, thereby obtain high-precision product.

The invention has the beneficial effects as follows: adopt the accurate cast steel technology of silicon melten gel, the workpiece flat appearance is smooth, need not polishing, have the intensity height, good plasticity and toughness are arranged, fundamentally having solved the like product cracking can not repair, the unwarrantable shortcoming of dimensional accuracy makes truck safer under heavily loaded situation, more stable, more reliable.

The specific embodiment

A kind of shell production process that subtracts comprises the steps:

A, at first design and produce the Precision Aluminum mould according to product requirement;

B, the paraffin that proportioning is good inject mould, obtain original wax-pattern;

Thereby C, repetition coating and the shell that drenches sand acquisition sufficient intensity on wax-pattern

D, the paraffin wax in the shell is handled, obtained die cavity;

E, roasting shell are to uniform temperature;

F, employing intermediate frequency furnace melting molten steel

G with pouring molten steel in the good shell of roasting;

Behind H, the place to go shell, prescind dead head and sand removal, ball blast, obtain blank;

I, heat-treat according to product needed.

J, blank is carried out machining, thereby obtain high-accuracy product.

Subtract shell and adopt the accurate cast steel technology of silicon melten gel, avoided size shortcoming rambunctious; The casting flaw of simultaneously also having avoided ordinary sand casting to bring, and cause a series of adverse consequences such as cracking, leakage of oil.

The present invention is not limited to above-mentioned preferred forms, and anyone should learn the common variation of making and replace and should be included in protection scope of the present invention under the enlightenment of technical scheme.

Claims (1)

1. one kind subtracts the shell production process, comprises the steps:

A, make accurate aluminum dipping form;

B, the liquid paraffin of uniform temperature is injected mould by wax injector, obtain wax-pattern;

C, on wax-pattern, repeat coating and drench sand and harden shell and drying;

D, dewaxing obtain die cavity;

E, roasting shell;

F, employing intermediate frequency furnace melting molten steel;

G, with pouring molten steel in the good shell of roasting;

Behind H, the place to go shell, prescind dead head and sand removal, ball blast, obtain blank;

I, blank is carried out corresponding heat treatment;

J, blank is carried out machining, thereby obtain high-precision product.