CN2418978Y

CN2418978Y - Liquid pressing mould for flywheel cover for gear chamber of multi-cylinder diesel engine

Info

Publication number: CN2418978Y
Application number: CN 00219247
Authority: CN
Inventors: 王秀清
Original assignee: Individual
Current assignee: Individual
Priority date: 2000-01-24
Filing date: 2000-01-24
Publication date: 2001-02-14
Anticipated expiration: 2010-01-24

Abstract

The utility model relates to an improvement of a casting multi-cylinder diesel engine gear chamber cover flywheel shell mold, which is characterized in that an upper mould cavity and a lower mould cavity of the step typing are changed; the upper mould is designed as a flywheel cavity, the lower mould cavity is designed as a gearwheel cavity, and the slope of a withdrawing mould is contracted; outer slide blocks are changed into cross pin pumping core slide blocks, inner pumping core blocks are added, and a groove is arranged at the reinforcing point so as to lighten the weight of the die cast flywheel shell. The internal organization is compact, the materials are even, and the grain is refined, which reduce the defect that the mechanical property is influenced by air holes and holes of products. The utility model can satisfy the requirements of high-power diesel engines.

Description

A kind of multi-cylinder diesel engine gear chamber cover cap bell housing TUBE BY LIQUID EXTRUSION mould

Utility model is about the improvement to die casting multi-cylinder diesel engine gear chamber cover cap bell housing mould, relates in particular to a kind of mould of suitable TUBE BY LIQUID EXTRUSION die casting.

Multi-cylinder diesel engine gear chamber cover cap bell housing (as a vapour multi-cylinder diesel engine gear chamber cover cap bell housing) is because special-shaped complicated, usually adopt aluminum alloy low-pressure casting process and gravity foundry technology mold casting forming, the step portion pattern tool that this technology is used, the patrix of mould is the gear cavity die cavity, and counterdie is a flywheel chamber die cavity.Owing to use the casting technique crystallization pressure of above-mentioned mould low, and the full aluminium liquid long flow path of the significant points of bell housing, the pressure loss is big, the die casting finished product is easy to generate defectives such as shrinkage cavity, crackle, not only cause the percent defective height, and influencing on mechanical performance index, the especially bell housings such as intensity, percentage elongation of bell housing contiguous block intensity difference with base, easily ruptures in the installation back; Secondly, the cast iron mould that above-mentioned die casting method adopts, its mold cavity surface is coarse, causes the finished product presentation quality poor, and dimensional accuracy is low; The mould of above-mentioned process using mechanization degree when die casting is low besides, thereby production efficiency is lower.In addition, the slide block demoulding of loosing core outward of above-mentioned low pressure casting die mould is by manually beaing, and it is big not only to operate labour intensity, the slide block life-span is short, and beat for a long time and cause that easily slide block distortion causes the mould shift, causing that the thick product surface quality that brings greatly of product overlap is poor, allowance increases.Especially adopt above-mentioned ingot casting mould, because of the technological requirement draw taper generally more greatly 3.5 the degree, cause die casting bell housing product sidewall and internal projection wall thickness big, increased consumption of raw materials and product weight.All these cause the die casting product cost higher relatively, and with the bell housing product of above-mentioned mould and method die casting, because intensity does not reach requirement, can not be used for high-power diesel engine.

The purpose of utility model is the improvement of doing at the defective of above-mentioned die casting method and mould existence, a kind of die casting product good mechanical property is provided, the appearance Functionality, quality and appealing design, the multi-cylinder diesel engine gear chamber cover cap bell housing TUBE BY LIQUID EXTRUSION mould that dimensional accuracy and production efficiency are high.

Another purpose of utility model is to provide the consumption of a kind of die casting product material few, and cost is low, lightweight multi-cylinder diesel engine gear chamber cover cap bell housing TUBE BY LIQUID EXTRUSION mould.

The utility model purpose realizes, it mainly is the last lower impressions that changes mould step portion profile, patrix is designed to the flywheel chamber, counterdie is designed to gear cavity, the significant points that can make bell housing like this when die casting shortens full aluminium liquid flow process more near cast gate, has reduced the pressure loss of aluminium liquid in cavity filling process, satisfy the feeding requirement, made it to be suitable for the TUBE BY LIQUID EXTRUSION technological requirement.Specifically, utility model multi-cylinder diesel engine gear chamber cover cap bell housing TUBE BY LIQUID EXTRUSION mould comprises upper die and lower die and two outer slides of ladder somatotype, it is characterized in that the said model flywheel chamber of going up, and counterdie is a gear cavity.

Another purpose of utility model realizes, is by reducing the mold cavity pattern draft, make pattern draft be reduced to the 1-2.5 degree by 3.5 original degree, reach and reduce unnecessary wall thickness, alleviating product weight and reduce material consumption.The upper and lower mould die cavity pattern draft of the described mould of utility model, can be identical, also can be different, but be the more convenient demoulding, especially not wait to well, the pattern draft of last model cavity is less to be the 1-2 degree to mold cavity upper and lower mould pattern draft, and the pattern draft of counterdie die cavity is the 1.5-2.5 degree slightly greatly, can make upper and lower mould die cavity package power difference like this, help shaped article and deviate from patrix.

Utility model is for improving product surface quality, reduce mould shift value, enhance productivity, reduce labor intensity, prolong die life, two outer slides that side form mould flywheel chamber outside is loosed core outward change the taper pin slide block of loosing core into, because of taper pin effect die sinking rear slider can be automatically and the product disengagement, do not need manually to beat, then can automatically reset behind the matched moulds.Utility model also is positioned at middle part, bell housing shirt rim in inboard, mould flywheel chamber increase a movable inner slide, can reduce the unnecessary wall thickness in this position like this, reaches shrinkage cavity and the rarefaction defect of eliminating this position.

For strengthening the contiguous block intensity of bell housing and base, utility model also is provided with groove on two taper pins of mould are loosed core outer slide, and the counterdie flywheel chamber side below two taper pins are loosed core outer slide has recessed groove, make the die casting product form the reinforcement that protrudes, so as to strengthening the rigidity and the intensity of contiguous block, avoid the fracture after bell housing is installed.

Below in conjunction with 6 cylinder diesel gear chamber cover cap bell housing TUBE BY LIQUID EXTRUSION moulds, further specify utility model structure and advantage.

Fig. 1 is the mould structure schematic diagram.

Fig. 2 turn 90 degrees back counterdie die opening state structural representation for mould revolves.

Fig. 3 be two taper pins loose core outer slide A to, B to side view.

Embodiment: referring to accompanying drawing, multi-cylinder diesel engine gear chamber cover cap bell housing mould has flywheel chamber patrix 1 and the gear cavity counterdie 2 that is the ladder somatotype, two outer slide blocks 5 of loosing core that intert on taper pin 4 are arranged between upper and lower mould, and inboard, mould flywheel chamber is positioned at movable inner slide 3 compositions at middle part, shirt rim.Aluminium liquid cast gate 8 is positioned at counterdie, and patrix pattern draft 9 is less to be 1.5 degree, and counterdie molding gradient 10 is 2 degree slightly greatly.Two taper pins outer slide of loosing core is positioned at the groove 6 that die cavity then has two depressions on the face, the counterdie flywheel chamber side of mould outer slide below have and groove 6 big to vertical recessed grooves 7, make the die casting product form the reinforcement that protrudes at above-mentioned groove position.During die casting, two separately upper and lower mould closes up, the two taper pins outer slide automatic wrapping (inwardly) of loosing core is located, aluminium liquid enters full die cavity from aluminium liquid cast gate; During the demoulding, along with upper and lower mould separates, the two taper pins outer slide of loosing core is outwards opened automatically, and the die casting product is deviate from patrix.

Utility model is owing to changed mould structure, thereby can adopt the good liquid extrusion casting method of die casting performance, overcome original mould and adopted the defective that low pressure casting caused, make die casting product dense internal organization, homogeneous, grain refinement has effectively reduced the defective that product pore, shrinkage cavity etc. influence mechanical performance, also strengthened the rigidity and the intensity of connecting portion simultaneously, tensile strength can be by the 160N/mm of low pressure casting ², bring up to 205N/mm ², percentage elongation brings up to 3.8% by original 1.3%, and shock resistance also improves greatly, more can satisfy the requirement of high-power diesel engine to bell housing.The die casting product surface is bright and clean, the dimensional accuracy height, bring up to the CT8 level by original C T9 level, allowance reduces, and has reduced the machining cost, reducing of pattern draft, not only make die casting product wall thickness even, the same specification product weight is alleviated about 1KG, the die casting yield rate is brought up to more than 90%, production efficiency obviously improves, and therefore has tangible quality-advantage and cost efficiency advantage.Taper pin is loosed core outward demoulding rear slider separately need not be beaten naturally, has avoided causing the mould shift because of beaing.

For convenience of description, the said multi-cylinder diesel engine gear chamber of utility model cover cap bell housing and bell housing two speech indications are same thing.

Claims

1, a kind of multi-cylinder diesel engine gear chamber cover cap bell housing TUBE BY LIQUID EXTRUSION mould comprises upper die and lower die and two outer slides of ladder somatotype it is characterized in that said patrix is the flywheel chamber that counterdie is a gear cavity.

2, according to the described multi-cylinder diesel engine gear chamber of claim 1 cover cap bell housing TUBE BY LIQUID EXTRUSION mould, it is characterized in that said mould pattern draft is the 1-2.5 degree.

3, according to the described multi-cylinder diesel engine gear chamber of claim 2 cover cap bell housing TUBE BY LIQUID EXTRUSION mould, it is characterized in that said mould upper and lower mould pattern draft does not wait.

4, according to the described multi-cylinder diesel engine gear chamber of claim 3 cover cap bell housing TUBE BY LIQUID EXTRUSION mould, it is characterized in that said upper mould pattern draft is less for the 1-2 degree, the counterdie pattern draft is the 1.5-2.5 degree slightly greatly.

5,, it is characterized in that said two outer slides are the taper pin slide block of loosing core according to the described multi-cylinder diesel engine gear chamber of claim 1 cover cap bell housing TUBE BY LIQUID EXTRUSION mould.

6,, it is characterized in that the said taper pin slide block die cavity of loosing core then has two grooves on the face according to the described multi-cylinder diesel engine gear chamber of claim 5 cover cap bell housing TUBE BY LIQUID EXTRUSION mould.

7,, it is characterized in that the counterdie flywheel chamber side of said mould outer slide below has recessed groove according to claim 1 or 6 described multi-cylinder diesel engine gear chamber cover cap bell housing TUBE BY LIQUID EXTRUSION moulds.

8,, it is characterized in that inboard, said mould flywheel chamber is positioned at the middle part, shirt rim one movable inner slide is arranged according to the described multi-cylinder diesel engine gear chamber of claim 1 cover cap bell housing TUBE BY LIQUID EXTRUSION mould.