CN200957453Y

CN200957453Y - Vacuum die-casting mould

Info

Publication number: CN200957453Y
Application number: CN 200620103415
Authority: CN
Inventors: ***
Original assignee: Individual
Current assignee: Individual
Priority date: 2006-05-10
Filing date: 2006-05-10
Publication date: 2007-10-10
Anticipated expiration: 2016-05-10

Abstract

The utility model relates to a vacuum die-casting mold and belongs to the technical field of die structure. The utility model consists of cover half, a movable half, a topping device, a cooling system, and an exhaust system. A seal ring is provided at the external side of the parting face of the cover half and movable half. The seal ring is arranged at the external side of the air exhaust side, whose one end is sealed, and another end communicated with an overflow groove. The air exhaust structure is composed of one or several indention air exhaust grooves. The utility model has the advantages of good air exhaust effect, smooth product surface, stable product shape, etc.

Description

Vacuum die-casting mould

Technical field

The utility model technology relates to a kind of structure of mould, and especially a kind of exhaust sealing structure of vacuum die-casting mould belongs to the technical field of mechanical invention.

Technical background

In general, the compression mod structure comprises: cover half, dynamic model, and wherein cover half is to be fixed on the die casting machine cover half installing plate, connects with nozzle or pressure chamber with sprue; Dynamic model is to be fixed on the die casting machine dynamic model installing plate, and the servo-actuated mold mounting plate is when making the folding mould and moving matched moulds, closedly constitutes die cavity and casting system, and liquid metals under high pressure is full of die cavity, dynamic model separates with cover half during die sinking, by means of the ejecting mechanism that is located on the dynamic model foundry goods is released.The formation structure of compression mod according to effect be categorized as forming part, running gate system, lead accurate part, ejecting mechanism, side core-drawing mechanism, row overflow compositions such as system, cooling system, support accessory, wherein lead accurate part to form by guide pillar, guide pin bushing; Ejecting mechanism is by push rod (thimble), release link, and ejector pin retaining plate, push pedal, the push pedal guide pillar, ejector guide pillar constitutes.Wherein exhaust structure is to the outward appearance of final products, and particularly the adjusting range of the quality of foundry goods inside and extrusion process has significant impact.When molten metal when the hyperbaric chamber enters running channel, its injection speed comparatively fast makes a large amount of gas be involved in the die cavity, and gas sharply expands under the effect of HTHP, hindered flowing of molten metal, simultaneously also dissolved in the molten metal in a large number, defective such as surface cold shut current mark obviously increases when making the last moulding of product, and problems such as the gentle hole of the inner slag inclusion of foundry goods also obviously increase.Under the matched moulds state, because the effect of HTHP is sharply expanded gas and can't be got rid of rapidly, cause its moment type power that rises excessive, clamp force greater than die casting machine, mould jet mould occurs and the die joint place produces a large amount of overlaps, therefore bigger variation also takes place in the size and dimension of foundry goods, when serious even waste product in batches occurs.In sum, good exhaust structure is concerning die casting and die casting production, and is extremely important.Adopt novel Sealing Technology to make two die faces in conjunction with after tight now, with the mode that vacuumizes the vacuum of die cavity is reached about 0.05Mpa, molten metal die cavity gas inside pressure when injection reduces like this, and press casting procedure is more simple and convenient.But reach absolute vacuum is impossible, finally still has a small amount of gas to hinder flowing of molten metal in die cavity, offers what kind of seal venting system and remains the technical barrier of working as previous more complicated.

Summary of the invention

The utility model technical purpose is to provide a kind of vacuum die-casting mould exhaust structure preferably, and surface cold shut current mark, inside have slag inclusion and pore, jet mould and die joint place to produce technical problems such as a large amount of burrs when having solved the exhaust problem that exists on the prior art and causing the last moulding of product.

The purpose of the utility model technology mainly solves by the following technical programs:

A kind of vacuum die-casting mould, comprise cover half, dynamic model, liftout attachment, cooling system and exhaust structure, there is sealing ring the peripheral inboard along die joint that it is characterized in that described fixed half and moving half, the sealing of described exhaust structure one end with vacuumize groove and link to each other, the other end communicates with overflow launder, and described exhaust structure is made of one or more zigzag air discharge duct at least, and described exhaust structure is between sealing ring and the core rod.In general because the fixed half and moving half of the different moulds of the structure of product comprises template and core rod, the core rod inner face is inserted, the die cavity different according to product arranged on the core rod face, moving, the contact-making surface of fixed two core rods is a die joint, steam vent is set on die joint, in the back of moving platen the ejection system is set, core rod is fixed on the template by screw, reinforce that hermetically-sealed construction is located on the template it and die joint is in the same plane, can be located on dynamic model and the cover half simultaneously, also can only be located on one of them, usually the die joint of mould is square, and core rod is in the centre, and sealing ring is located at the outside and has stoped entering of extraneous gas to help the vacuum that keeps die cavity interior, exhaust structure is located on the template face non-intersect with sealing ring, has guaranteed the die cavity exhaust when die casting.Because the outer rim in template is provided with sealing ring, extraneous air is difficult for entering in the die cavity after die cavity is evacuated, the zigzag air discharge duct that links to each other with overflow launder is set on template, the other end of air discharge duct with vacuumize groove and be connected and be closed, its jagged structure prevents passing through in a large number of molten metal, do not hinder simultaneously the smooth and easy discharge of gas again, in die casting, gases at high pressure in the die cavity are compressed in the air discharge duct, enter by air discharge duct rapidly and vacuumize in the groove, with air scavenge, be unlikely to produce the size and dimension of affected by high foundry goods by outside vaccum-pumping equipment, and the internal soundness of product.

As preferably, described exhaust structure is made of at least one group of air discharge duct, and every group of air discharge duct is made up of 2-4 zigzag air discharge duct, and the zigzag air discharge duct of described exhaust structure is arranged in parallel.Select jagged grate flow channel, can make die cavity intracavity gas in quick die casting be discharged to rapidly vacuumizes in the groove, can prevent simultaneously that molten metal from causing the obstruction of exhaust duct and the overlap of product from the exhaust duct outflow, the form of 4 runners meets the exhaust mode of die cast metal, it is more reasonable to seem in this programme, better effects if.

As preferably, be provided with link slot between described overflow launder, link slot connects perforation with adjacent overflow launder.Make overflow launder integral body connect, the flow adjustment range of overflow launder is bigger.

As preferably, the tooth angle of described zigzag air discharge duct is between the 50-60 degree.Sawtooth similar " Z " type, described air discharge duct angle herein the time the mobile resistance that is subjected to of liquid bigger, the suffered influence of exhaust effect then is not very big.

As preferably, the cross section of described zigzag air discharge duct is that trapezoidal, trapezoidal side and base angle is the 120-150 degree, and the long limit of the cross section of described zigzag air discharge duct is at 6-9mm, and described minor face length is at 5-8mm, and is high at 0.3-0.7mm.Described air discharge duct is opened on die joint, and the cross section that the air discharge duct gained is cut on the plane of vertical-parting face is its cross section, adopts this cross section, the contact area that facts have proved the fluid of equal flow and mould still less, easier cooled and solidified.

As preferably, the long limit of the cross section of described zigzag air discharge duct is at 8mm, and described minor face length is at 7mm, and is high at 0.5mm.Experiment showed, the employing said structure, the appearance of exhaust and product is better.

Characteristics such as therefore, the utility model technology has good exhaust effect, and the products obtained therefrom overlap is few, and the size shape stabilized product quality is better.

Description of drawings

Accompanying drawing 1 is the structural representation of dynamic model face of the present utility model;

Accompanying drawing 2 is amplification assumption diagrams of Figure 1A portion.

The specific embodiment

Below by embodiment, and in conjunction with the accompanying

drawings

1 and 2, the technical solution of the utility model is described in further detail.

Embodiment 1: a kind of vacuum die-casting mould exhaust structure as shown in Figure 1, comprise cover half, dynamic model, liftout attachment, cooling system and exhaust structure, there is sealing ring 2 in the outside of the die joint of described fixed half and moving half, described sealing ring 2 is in exhaust structure 1 outside, one end of described exhaust structure 1 is connecting and vacuumizes groove other end in the close encapsulation circle and communicate with overflow launder 4, and described exhaust structure 1 is that one or more zigzag air discharge duct 8 constitutes.There is core rod 3 template 7 the insides, the die cavity 5 that product is arranged on 3 of the core rods, described exhaust structure 1 has two zigzag air discharge ducts 8 to constitute, these two zigzag air discharge duct parallel arrangements, described exhaust structure has five groups, an end of every group links to each other with overflow launder, and eight overflow launders are set on described die joint altogether, wherein has seven overflow launders to vacuumize the continuous perforation of groove by connection; The tooth angle 6 of described zigzag air discharge duct 8 is 53 degree.

Claims

1, a kind of vacuum die-casting mould, comprise cover half, dynamic model, liftout attachment, cooling system and exhaust structure, there is sealing ring the peripheral inboard along die joint that it is characterized in that described fixed half and moving half, described exhaust structure one end connection vacuumizes groove in the close encapsulation circle, the other end communicates with overflow launder, and described exhaust structure is made of one or more zigzag air discharge duct at least, and described exhaust structure is between sealing ring and the core rod.

2, vacuum die-casting mould according to claim 2 is characterized in that described exhaust structure is made of at least one group of air discharge duct, and every group of air discharge duct is made up of 2-4 zigzag air discharge duct, and the zigzag air discharge duct of described exhaust structure is arranged in parallel.

3, vacuum die-casting mould according to claim 1 and 2 is characterized in that being provided with between overflow launder link slot, and link slot connects perforation with adjacent overflow launder.

4, vacuum die-casting mould according to claim 2, the tooth angle that it is characterized in that described zigzag air discharge duct is between the 50-60 degree.

5, according to claim 1 or 2 or 4 described vacuum die-casting moulds, the cross section that it is characterized in that described zigzag air discharge duct is trapezoidal, trapezoidal side and base angle are the 120-150 degree, the long limit of the cross section of described zigzag air discharge duct is at 6-9mm, described minor face length is at 5-8mm, and is high at 0.3-0.7mm.

6, according to claim 1 or 2 or 4 described vacuum die-casting moulds, the long limit of cross section that it is characterized in that described zigzag air discharge duct is at 8mm, and described minor face length is at 7mm, and is high at 0.5mm.

7, vacuum die-casting mould according to claim 3, the cross section that it is characterized in that described zigzag air discharge duct is trapezoidal, trapezoidal side and base angle are the 120-150 degree, the long limit of the cross section of described zigzag air discharge duct is at 6-9mm, described minor face length is at 5-8mm, and is high at 0.3-0.7mm.

8, according to claim 1 or 2 or 4 described vacuum die-casting moulds, the long limit of cross section that it is characterized in that described zigzag air discharge duct is at 8mm, and described minor face length is at 7mm, and is high at 0.5mm.