CN1730195A

CN1730195A - Casting dies for engine cam shaft

Info

Publication number: CN1730195A
Application number: CN 200510060515
Authority: CN
Inventors: 鲍忠林
Original assignee: JUNXIANG MACHINE MOULD CO Ltd XIANGSHAN CITY
Current assignee: JUNXIANG MACHINE MOULD CO Ltd XIANGSHAN CITY
Priority date: 2005-08-23
Filing date: 2005-08-23
Publication date: 2006-02-08
Anticipated expiration: 2025-08-23
Also published as: CN100500326C

Abstract

The invention relates to a motor cam shaft casting mould, which is made by heat-proof die steel material and cast in the whole. Said heat-proof die steel material is brand of H13 or DAC. The mould comprises die cavity formed by mould body and work piece ejecting device. Die cavity equips pouring channel located at the bottom and connecting with sprue in it, inner pouring channel in the middle and feeding head on the top. Mould body equips water-cooling channel and compressed air channel on it. The invention has the advantages of high-quality casting surface, rapid forming, and accurate casting physical dimension and low cost.

Description

A kind of casting mould of engine cam

Technical field

The present invention relates to the transmission device technical field, especially relate to the casting mould technical field of camshaft.

Background technology

Making at present the engine cam method has and adopts integral cast, also has to adopt power transmission shaft and the cam to make respectively to make it to fuse by welding or fusion again; Wherein integral cast is used more generally, generally be with sand mold die cast technology, because the dark clip slot that the cam of camshaft and the diameter of axle constitute, cause very difficulty of moulding removing from mould, simultaneously because sand mold has bigger humidity, make the metallographic structure and the mechanical and physical performance of foundry goods can not get effective assurance, percent defective is higher.

Summary of the invention

The objective of the invention is provides a kind of casting mould of engine cam at above-mentioned prior art problem, makes the moulding removing from mould convenient, the hardening time shortening of molten iron in die cavity, foundry goods geometric accuracy height, any surface finish, mechanical and physical performance is good, and makes material cost relatively low.

For achieving the above object, technical scheme of the present invention is such: a kind of casting mould of engine cam, adopt the refractory steel manufacturing, to replace sand mold mould integral cast camshaft; Said refractory steel can be used the trades mark such as H13, DAC; On mould structure, remove and adopt the circulating cooling system cooling die originally external; other establishes high pressure air feed system and blows to the wall that foundry goods contacts with die cavity; make it to form betwixt one deck air film; and utilize flowing gas that heat is taken away; with the do not cast erosion of molten iron of protection mould; make the foundry goods removing from mould smooth, prolong die life.

The experimental result of this programme shows, when the moment that the molten iron of temperature 〉=1350 ℃ waters full die cavity, the temperature on mold cavity surface only is 370 ℃, along with contacting of molten iron and die cavity, cast(ing) surface forms the layer of surface cured layer rapidly, and feed compressed air at mold cavity surface this moment immediately, and local meeting nature forms air film between die cavity and the foundry goods, heat is taken away by moving air simultaneously, and gas is discharged from the air discharge duct that the mould die joint is provided with; Said air film owing to be to produce, so can not produce harmful effect to the moulding and the inherent quality of foundry goods, help the removing from mould of foundry goods on the contrary after the surface cure layer of foundry goods forms.

Owing to adopted technique scheme, moulding removing from mould of the present invention is all convenient than the sand mold mould, cast in metal die because of the foundry goods of camshaft and to form, so surface quality height of foundry goods, owing to be provided with water cooling system and air cooling system in the mould, make its shaping speed fast, the hardening time shortening of molten iron in die cavity, be generally for 12 seconds from watering molten iron to moulding, get final product the die sinking removing from mould, the mold cavity surface temperature is below 750 ℃ during removing from mould, and the temperature of foundry goods then is higher than 1000 ℃, the rapid shaping of cast(ing) surface during casting, do not influence the effective liquidate speed of iron liquid and the feeding of foundry goods inside, so the physical dimension of foundry goods is accurate, mechanical and physical performance is preferable, because the mold materials steel, cost is relatively low.

Description of drawings

Fig. 1 is a structural representation of the present invention.

Fig. 2 is the A-A view of Fig. 1.

Among the figure: 1, feeding head, 2, die cavity, 3, ingate, 4, cross gate, 5, the water cooling road, 6, top board, 7, backing plate, 8, knock-pin, 9, sealing ring, 10, the compressed air road.

The specific embodiment

Below in conjunction with drawings and Examples the present invention is described in detail.

Shown in accompanying drawing 1-2, the casting mould of a kind of engine cam of the present invention adopts the refractory steel manufacturing, to replace sand mold mould integral cast camshaft; Said refractory steel can be used the trades mark such as H13, DAC; Mould comprises die cavity 2 and the workpiece ejecting mechanism that is surrounded by die ontology, has in the die cavity to be located at cross gate 4, the ingate 3 at middle part and the feeding head 1 on top that the bottom links to each other with cast gate; The knock-pin 8 that said ejecting mechanism comprises top board 6 and is fixed thereon, knock-pin can contact connection with workpiece in the die cavity; One backing plate 7 is arranged between die ontology and top board, be provided with sealing ring 9 between backing plate and the die ontology, on die ontology, be provided with water cooling road 5, and compressed air road 10, compressed air outlet directes reach workpiece, by water and air cooling but system heat is taken away fast, make the cast(ing) surface curing of lowering the temperature rapidly, avoid the erosion of high temperature liquid iron, influence die life mould.

Claims

1, a kind of casting mould of engine cam is characterized in that: mould is made by the refractory steel material, with the integral cast camshaft.

2, the casting mould of a kind of engine cam according to claim 1 is characterized in that: said refractory steel material is the refractory steel of the H13 or the DAC trade mark.

3, the casting mould of a kind of engine cam according to claim 1, it is characterized in that: it comprises die cavity (2) and the workpiece ejecting mechanism that is surrounded by die ontology, has in the die cavity to be located at cross gate (4), the ingate (3) at middle part and the feeding head (1) on top that the bottom links to each other with cast gate; Said ejecting mechanism is by top board (6) and the knock-pin (8) that is fixed thereon, and knock-pin can contact connection with workpiece in the die cavity; One backing plate (7) is arranged between die ontology and top board, be provided with sealing ring (9) between backing plate and the die ontology, be provided with water cooling road (5) and compressed air road (10) on die ontology, compressed air outlet directes reach workpiece.