Mixed lap joint type ingate system of aluminum alloy die-casting gearbox shell

A technology of inner sprue and gearbox to avoid the generation of eddy current and turbulent flow area, slow down the frontal impact, reduce the local drag coefficient and pressure loss

Active Publication Date: 2022-06-10
NANJING TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] This invention aims at the problem that the traditional ingate system can no longer meet the dimensional accuracy and quality requirements of the aluminum alloy gearbox shell, and invents an aluminum alloy die-cast gearbox Hybrid Lap Ingate System for Housings

Method used

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  • Mixed lap joint type ingate system of aluminum alloy die-casting gearbox shell
  • Mixed lap joint type ingate system of aluminum alloy die-casting gearbox shell

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Embodiment Construction

[0020] A hybrid lap-type inrunner system for an aluminum alloy die-casting gearbox housing, the inrunner system consists of a housing cavity 400, an inrunner 310, an inrunner 320, an inrunner 330, a runner 200 and The four parts of the sprue 100 are sequentially connected, such as figure 1 shown. In order to make the molten aluminum advance smoothly in the runner system and enhance its filling capacity, the housing cavity 400, the runner 310, the runner 320, the runner 330, the runner 200 and The successive connections of the four parts of the sprue 100 are transitioned through rounded corners, and the radius of the rounded corners is in the range of 2 to 10 mm. Preferably, combined with the size of the runner in this embodiment, when the sprue 100 and the runner 200 are rounded at the junction Radius 10 mm, runner 200 and ingate 310, ingate 320, ingate 330 junction fillet radius 5 mm and ingate 310, ingate 320, ingate 330 and shell cavity 400 When the fillet radius of the c...

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Abstract

A mixed lap joint type ingate system of an aluminum alloy die-casting gearbox shell is characterized in that the mixed lap joint type ingate system is formed by sequentially connecting a shell cavity, an ingate, a transverse pouring gate and a straight pouring gate, and the outflow end of the ingate is arranged on the lower left portion, the lower middle portion and the lower right portion of the shell cavity in sequence; molten aluminum liquid enters a shell cavity at different jet flow angles through the ingate outflow end, and the cross section area of the cross gate outflow end is larger than the total cross section area of the ingate outflow end and tends to be gradually reduced. According to the invention, molten aluminum can stably and sequentially pass through the sprue, the cross gate and the ingate, enters the shell cavity and then is stably filled, so that the local resistance coefficient and pressure loss of the molten aluminum in the runner and the shell cavity are reduced, and the front impact of the molten aluminum on the inner side of the shell cavity is greatly relieved; the generation of eddy current and turbulent flow areas and the generation of defects such as air holes and loose structures are avoided, and the compactness and the yield of the shell structure are effectively improved.

Description

technical field [0001] The invention relates to the technical field of aluminum alloy die-casting, in particular to an ingate design technology, in particular to a hybrid lap-joint ingate system for an aluminum alloy die-casting gearbox housing. Background technique [0002] The gearbox housing is an important part of the automobile transmission system. It is generally made of cast iron or aluminum alloy. Its molding process includes low-pressure casting, pressure casting, etc. In order to reduce the weight of the car and meet the requirements of high speed, safety, energy saving and environmental protection, the material of the gearbox shell is replaced by aluminum alloy castings. Because of the beautiful appearance, good quality, high dimensional accuracy and high production efficiency of die-casting products, It is widely used in the production of gearbox housings, but it is prone to some casting defects in the die-casting process, such as air holes, loose structure and o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D17/22
CPCB22D17/2272Y02P10/20
Inventor 苏小平赵飞康正阳周大双
Owner NANJING TECH UNIV
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