CN103111596A

CN103111596A - Automobile gearbox shell body pressure casting technology

Info

Publication number: CN103111596A
Application number: CN2012105313605A
Authority: CN
Inventors: 沈成溜
Original assignee: CHONGQING BAIJI SIXING CASTING Co Ltd
Current assignee: CHONGQING BAIJI SIXING CASTING Co Ltd
Priority date: 2012-12-11
Filing date: 2012-12-11
Publication date: 2013-05-22

Abstract

The invention belongs to the technical field of pressure casting technologies, and particularly relates to an automobile gearbox shell body pressure casting technology which comprises a first step of preparation before pressure casting; a second step of a pressure casting process, namely a releasing agent layer is first coated on the surface of a pressure casting mould, then a pulling core is inserted, the inserting order of the pulling core is from a movable block, a front slide block and a back slide block to a left slide block and a right slide block, mould assembly is carried out next, pressure injection is carried out after mould assembly is finished, demoulding is carried out after the pressure injection, the pulling core is pulled out after the demoulding is finished, the pulling order of the pulling core from the left slide block and the right slide block to the front slide block and the back slide block, a blank is taken out finally, and a pushing device is used for pushing out the movable block; and a third step of pressure-casting postprocessing. The purposes of the automobile gearbox shell body pressure casting technology are that the multiple problems that an existing automobile gearbox shell body black sand casting technology is low in production efficiency, low in product pass rate, bad in production environment, high in production cost, not suitable for automobile light weight and the like are solved.

Description

The automobile speed variator extrusion process

Technical field

The invention belongs to the extrusion process technical field, be specifically related to the automobile speed variator extrusion process.

Background technology

The automobile speed variator of former domestic and international production adopts the manufacturing of black sand casting process to form mostly, and the material that wherein adopts is cast iron.There is following defective in this casting technique:

1, production efficiency is low, just can do 1 product in every 12～15 minutes;

2, sand mould shake sand is more difficult, and sand is easily stayed in product, causes the low qualified of product;

3, the raw material of sand mould is resin sand, pollutes greatlyr, and stronger pungent smell is arranged, and causes producing bad border more abominable;

4, sand mould can not be reused, and causes production cost higher;

5, rising head is larger, and the waste material causes production cost higher;

6, cast iron weight is 3.24 times of aluminium alloy, is not suitable for automotive light weight technology.

Summary of the invention

Purpose of the present invention: in order to solve that the production efficiency that existing automobile speed variator black sand casting process exists is low, product percent of pass is on the low side, production environment is abominable, production cost is higher and to be not suitable for the problems such as automotive light weight technology, and proposition automobile speed variator extrusion process.

Technical scheme of the present invention: the automobile speed variator extrusion process comprises the following steps:

Step 1: prepare before die casting, comprise the inspection of raw and process materials, storage, protection, melting and the conveying of aluminium water;

Step 2: the die casting operation, namely first at die casting surface spraying one deck releasing agent; Then insert and loose core, the order of inserting of loosing core is: loose piece → front-slider and rear slider → left slider and right slide block; Next be matched moulds; Begin injection after matched moulds is complete; After treating that injection is completed, the beginning die sinking; After die sinking was completed, extraction was loosed core, and the order of extracting out of loosing core is: left slider and right slide block → front-slider and rear slider; At last blank is taken out, and adopt liftout attachment that loose piece is ejected;

Step 3: the die casting post processing comprises that blank goes cast gate, blank conveying, blank cleaning, blank ball blast, blank passivation, primary product conveying, primary product machined, the whole inspection of finished product, finished product packing and storage.

Automobile speed variator extrusion process of the present invention, owing to adopting extrusion process to substitute existing black sand casting process, therefore have following beneficial effect:

1, production efficiency improves greatly, produces one by original every 12～15 minutes and has brought up to one of production in every 1.4～1.8 minutes;

2, fundamentally solved sand and stayed problem in product, product percent of pass increases substantially;

3, adopt compression mod to replace sand mould, greatly improved production environment;

4, compression mod can be reused, and greatly reduces production cost;

5, rising head is less, not only saves material, has reduced production cost; And the outward appearance of product is more beautiful, and surface quality also increases;

6, the weight ratio cast iron of aluminium alloy is light, is fit to very much the lightweight of automobile.

Further, in described step 2, the scope of system pressure is: 14MPa～16MPa, the scope of the time that shoots material is: 9s～10s, the scope of die sinking time is: 6s～7s, the delay time that ejects of loose piece is: 1s.

The setting of these parameters can improve the quality of product to a great extent, reduces the production cost of enterprise.

Description of drawings

Fig. 1 is the position view of slide block in the step 2 of embodiment of automobile speed variator extrusion process of the present invention.

The specific embodiment

As shown in Figure 1, the invention provides the automobile speed variator extrusion process, comprise the following steps:

Step 2: the die casting operation, namely first at die casting surface spraying one deck releasing agent; Then insert and loose core, the order of inserting of loosing core is: loose piece → front-slider 2 and rear slider 4 → left slider 1 and right slide block 3; Next be matched moulds; Begin injection after matched moulds is complete; After treating that injection is completed, the beginning die sinking; After die sinking was completed, extraction was loosed core, and the order of extracting out of loosing core is: left slider 1 and right slide block 3 → front-slider 2 and rear slider 4; At last blank is taken out, and adopt liftout attachment that loose piece is ejected, wherein, in this step, the scope of system pressure is: 14MPa～16MPa, the scope of time of shooting material is: 9s～10s, and the scope of die sinking time is: 6s～7s, the delay time that ejects of loose piece is: 1s;

In the present embodiment, material adopts aluminium alloy, and the weight ratio cast iron of aluminium alloy is little, like this, can guarantee the lightweight of automobile.

In addition, extrusion process is simpler than casting technique operation, has greatly improved operating efficiency, and whole manufacture process is time saving and energy saving, greatly reduces production cost.

In addition, the step 2 in this extrusion process is very crucial, and wherein, the mode of loosing core of employing is the mode of cross core-loosing, and the insertion of loosing core and the order of extraction are extremely important, and this mainly considers the particularity of transmission case body structure and be custom-designed.

In addition, the design of loose piece is extremely important, not only is convenient to the demoulding; And the wall thickness that can guarantee product is even.

In this extrusion process, the scope of system pressure is: 14MPa～16MPa, the scope of the time that shoots material is: 9s～10s, the scope of die sinking time is: 6s～7s, the delay time that ejects of loose piece is: 1s, the setting of these parameters can improve the quality of product.

Above-described is only the preferred embodiment of the present invention, should be understood that for a person skilled in the art, under the prerequisite that does not break away from structure of the present invention, can also make some distortion and improvement, these can not affect effect of the invention process and practical applicability.

Claims

1. automobile speed variator extrusion process is characterized in that: comprise the following steps:

Step 2: the die casting operation, namely first at die casting surface spraying one deck releasing agent; Then insert and loose core, the order of inserting of loosing core is: loose piece → front-slider (2) and rear slider (4) → left slider (1) and right slide block (3); Next be matched moulds; Begin injection after matched moulds is complete; After treating that injection is completed, the beginning die sinking; After die sinking was completed, extraction was loosed core, and the order of extracting out of loosing core is: left slider (1) and right slide block (3) → front-slider (2) and rear slider (4); At last blank is taken out, and adopt liftout attachment that loose piece is ejected;

2. automobile speed variator extrusion process according to claim 1, it is characterized in that: in described step 2, the scope of system pressure is: 14MPa～16MPa, the scope of time of shooting material is: 9s～10s, the scope of die sinking time is: 6s～7s, the delay time that ejects of loose piece is: 1s.