CN105364017A

CN105364017A - Hollow valve lifter mold

Info

Publication number: CN105364017A
Application number: CN201510813200.3A
Authority: CN
Inventors: 赵逢荣; 李程; 李玉兰
Original assignee: CHENGDU XINGYU PRECISION CASTING Co Ltd
Current assignee: CHENGDU XINGYU PRECISION CASTING Co Ltd
Priority date: 2015-11-19
Filing date: 2015-11-19
Publication date: 2016-03-02

Abstract

The invention provides a hollow valve lifter mold. The hollow valve lifter die comprises a shell mold, eight cavities, diversion passages and a central cavity used for casting a hollow valve lifter are arranged in the shell mould, and the eight cavities are evenly distributed around the axis of the shell mold in a circle. Each cavity is communicated with the central cavity located in the middle of the shell mold through the corresponding diversion passage. A concave seat is arranged in the central cavity, smaller than the central cavity and provided with three diversion openings. An opening in the upper end of the central cavity is connected with an opening in the lower end of a sprue. A chilling plate is arranged at the lower end of the shell mold. The hollow valve lifter mold has the advantages that the valve lifter is cast through the shell mold but not solid, so that the raw materials are reduced, machining work hours and energy consumption are reduced, quality is improved, and the cost is reduced. The work conditions of workers are improved, small production line mechanical production can be realized, and the production efficiency is improved.

Description

Hollow valve tappet mould

Technical field

The present invention relates to technical field of mold, be specifically related to hollow valve tappet mould.

Background technology

Hollow valve tappet material is alloy-steel casting, thinnest part wall thickness only 2mm.Require that there is 4-5mm spoken parts in traditional operas at the tappet position that contacts with camshaft, all the other are grey mouth.

China continues to use solid cast always and generally adopts top pouring type and obtain spoken parts in traditional operas by Quench method at the position that tappet contacts with camshaft.Whole casting technique dead head ratio accounts for more than 50%.Product yield is quite low, large from the solid Lathe quantity be processed into needed for hollow tappet. and man-hour is many, and difficult quality guarantee.

Summary of the invention

The object of this invention is to provide a kind of hollow valve tappet mould, more than 50% is accounted in order to solve existing hollow valve tappet mould dead head ratio, product yield is quite low, large from the solid Lathe quantity be processed into needed for hollow tappet. and man-hour is many, and the problem of difficult quality guarantee.

For reaching foregoing invention object, the technical solution adopted in the present invention is: provide hollow valve tappet mould, comprise shell mould, in shell mould, be provided with eight die cavities for casting hollow valve lifter, runner and center cavity, eight die cavities around shell mould axial line and be uniformly distributed Cheng Yiquan; Each die cavity is communicated with the center cavity be positioned in the middle part of shell mould by runner; Be provided with dimple in center cavity, dimple is less than center cavity and establishes point three diffluence pass; Center cavity upper end open is connected with sprue lower ending opening; Shell mould lower end is provided with chill plate.

Center cavity upper end open is provided with filter screen.

Tool of the present invention has the following advantages:

(1) valve lifter changes shell moulded casting into by solid, has saved raw material, decreases the consumption of machining period and the energy, improves quality, reduce cost.

(2) improve the working condition of workman, little streamline mechanization production can be realized, improve productivity ratio.

Accompanying drawing explanation

Fig. 1 is structural representation of the present invention;

Fig. 2 is A-A sectional view in Fig. 1.

Wherein, chill plate (1), shell mould (2), runner (21), center cavity (22), dimple (3), sprue (4), filter screen (5), die cavity (6).

Detailed description of the invention

As depicted in figs. 1 and 2, this hollow valve tappet mould, comprises shell mould 2, is provided with eight die cavities 6 for casting hollow valve lifter, runner 21 and center cavity 22, eight die cavities 6 around the axial line of shell mould 2 and is uniformly distributed Cheng Yiquan in shell mould 2; Each die cavity 6 is communicated with the center cavity 22 be positioned in the middle part of shell mould 2 by runner 21; Be provided with dimple 3 in center cavity 22, dimple 3 is less than center cavity 22 and establishes point three diffluence pass; Center cavity 22 upper end open is connected with sprue 4 lower ending opening; Shell mould 2 lower end is provided with chill plate 1.Center cavity 22 upper end open is provided with filter screen 5.

The face that tappet contacts with camshaft, by chill plate 1 Quench, to produce the spoken parts in traditional operas of 4-5mm.Select granularity to be 100/200 order roughing sand, add resin, methenamine and calcium stearate, the precoated sand made by hot method.Add calcium stearate and can prevent from searching caking when film sand is deposited, increase the mobility of precoated sand, make type, wicking surface fine and close, easily eject during shell processed.Shell mould 2 precoated sand, dimple 3 self-hardening sand, filter screen 5 and sprue 4 etc. can select sand voluntarily according to existence conditions.Outer surface reserves the allowance of corase grind and fine grinding, and 3mm allowance is stayed at top; Pattern draft outer surface≤0.5 °, endoporus is l °.

Shell mould 2 manufactures on two station 40kg hot box shoot core machines, and shell mould 2 thickness is 6mm.Pattern draft is except tappet body, and all the other are at about 3 °.The thickness distribution of shell will be made even simultaneously as far as possible.

Molten metal enters dimple 3 from sprue 4 lower end through filter screen 5.The direction that its inflow direction and molten metal flow to casting mold is contrary, meanwhile, runner 21 tilts to make molten metal to rotate (this is conducive to skimming, plays similar centrifugal slag trap effect) by respective direction diametrically, makes the liquid metal filling entering runner 21 steady.Runner 21 plays the effect of ingate, and its structure adopts clearance type and high trapezoidal to combine, and this is conducive to the feeding to foundry goods, can realize consecutive solidification, avoids producing shrinkage cavity.Steam vent is offered in addition at each die cavity 6.Dimple 3 has eight claws, and its length is identical with the length of runner 21, and width is greater than ingate width, and this was both convenient to molding, in turn ensure that molten metal does not fill type from bottom.

Tool of the present invention has the following advantages:

Claims

1. hollow valve tappet mould, it is characterized in that: comprise shell mould (2), be provided with eight die cavities for casting hollow valve lifter (6), runner (21) and center cavity (22) in shell mould (2), eight die cavities (6) around shell mould (2) axial line and be uniformly distributed Cheng Yiquan; Each die cavity (6) is communicated with the center cavity (22) being positioned at shell mould (2) middle part by runner (21); Be provided with dimple (3) in center cavity (22), dimple (3) is less than center cavity (22) and establishes point three diffluence pass; Center cavity (22) upper end open is connected with sprue (4) lower ending opening; Shell mould (2) lower end is provided with chill plate (1).

2. hollow valve tappet mould according to claim 1, is characterized in that: center cavity (22) upper end open is provided with filter screen (5).