CN102371326A - Preforging mould structure for processing shaft fork part stamp forgings - Google Patents

Abstract

The invention relates to a mould structure for processing mechanical parts, in particular to a preforging mould structure for processing shaft fork stamp forgings. The preforging mould structure for processing the shaft fork part stamp forgings comprises a preforging upper mould and a preforging lower mould which are used for horizontally arranging a shaft fork part forging and pressing mould and is characterized in that: on the outer edge of the shaft fork part, mould joints of the preforging upper and lower moulds are positioned on the upper and lower symmetrical central surfaces of the part; and on the mould joint of an inner circle of a fork lug part, namely a U-shaped inner circle, the preforging upper mould is extended downward one circle, and the preforging lower mould is recessed downward one circle of the corresponding height. Due to the mould structure, under the condition of the same amount of the used materials, a cavity can be filled by metal conveniently, rejection rate of a forging is reduced, a flash width is smaller, a horizontal projection area is smaller, equipment tonnage can be reduced, the bearing load of the mould is smaller, the service life of the mould can be prolonged, and due to slight flash, materials and cost can be saved, and problems that blank is deflected and is not placed stably before can be solved.

Description

A kind of blocking mould structure of yoke class part forging part processing

Technical field

The present invention relates to a kind of machine components processed mould structure, specifically relate to the blocking mould structure of yoke class forging part processing.

Background technology

The yoke forging is to be widely used in the transmission of automobile and container ship and the heavy connection in the banding system, transmits the moment of torsion of engine and bears crooked combined load.At present, whole world automobile, truck, heavy truck, motor bus and other various vehicle transmission systems, and container ship all adopts transmission and the colligation fixed part of this yoke class forging part as key, market demand is very big.Therefore change slightly in its processing technology of process of manufacture, quality has raising slightly, and cost has reduction will produce great market clout and economic benefits slightly.

Yoke series products one end is a column output shaft, and the other end is the U-shaped prong, approximate Y word shape, and width size, the fork ear depth, fork length differ between the fork of prong, and fork ear wall thickness is relatively thin.At present domestic general manufacturing firm adopts contour forging technique to be processed into yoke class fork ear mold forging earlier, and then adopts processing or friction welding at two two circular holes of fork earphone processing and output shaft, accomplishes the manufacturing production of part.

So the technology of processing mode is more numerous and diverse, loaded down with trivial details, and two forks of tool earphone processing circular hole and output shaft adopt twice processing mode of processing or friction welding (FW), and weld defect is often arranged, and fracture accident takes place, and influence product quality even safety problem.

At present; Both at home and abroad processing yoke class forging part processing technology has that a kind of what be widely used is that mould structure all adopts plane symmetry branch modular form; Published (the 3rd edition) in 2008 in mechanical publishing house, " the sleeve pipe fork contour forging technique that forging and pressing handbook the 1st is introduced in rolling up the 784th page that plastic engineering association of Chinese Mechanical Engineering Society writes.At first the steel mill's bar with circle blocks blanking, heating, ejection, blocking, finish-forging, side cut, shaping.This technology is that the blank that ejection is good is placed in the blocker, then, along with the descending of blocking patrix exerted pressure to blank gradually, blank just squeezed respectively with the counter die cavity of clamp-oning counterdie and patrix in, through finish-forging formation product forging.

Bar is the big or small multidiameter shape of approximate grenade after blocking blanking, heating, ejection; Tentatively be Y word shape through blocking, finish-forging then is because the product horizontal positioned; Two fork ear integral body are overlooked and are the U font; Each fork ear wall is placed on lucky symmetry up and down in the forging die for vertically putting, and promptly the die joint of upper and lower mould is positioned on the horizontal symmetrical face of yoke.

Yet because yoke class part, fork portion wall thickness is all thinner, and it is bigger to open shelves between fork; When blocking was split material, metal was difficult to clamp-on in the die cavity of jaw portion, and the peak of jaw portion and edge angle are prone to lack material when causing finish forging at last; Cause forging to scrap, waste of material, the product in particularly a large amount of processing is found; The upper surface fork ear of the most of patrix of yoke that is arranged in mould is brighter and cleaner, full, and often there are some damaged, defectives in the lower surface of the fork ear in the blocking counterdie, influences the product mechanical processing quality; Cause to lack material, hole and forging structure tilt, and have improved percent defective.

Moreover, when prior art will be similar to grenade when blocking big or small multidiameter shape blank is put into counterdie, be difficult for centering, place unstablely with plain block in the middle of the counterdie, influence die forging speed of production and quality.

Traditional handicraft will strengthen the materials amount at the U-shaped prong in order to solve the problem that the blocking counterdie does not have abundance, lacks material, increase the consumption of blank; Caused the waste of material like this; Also increase the weight of the pressure that bears of mould, also must strengthen the tonnage of forging and pressing sometimes, increased power, electric power energy consumption; Simultaneously, the unstable defective of blank placement still can't solve in the production.Therefore, further ameliorative measure is hoped to have in this area.

Summary of the invention

The blocking mould structure that the purpose of this invention is to provide a kind of yoke class part forging part processing; Mainly be to solve existing Forging Technology to be prone to make the jaw portion of forging to produce the problem that is not fully filled; Realize saving material; Reduce the forging scrappage, increase die life, the consumption of input, investment and the energy of the minimizing and the equipment of saving; The purpose of improve the quality of products, reduce production costs, favorable environment being protected.Simultaneously, also hope to solve blank and place centering, problem stably.

The object of the invention is achieved by following technical scheme:

A kind of blocking mould structure of yoke class part forging part processing; The blocking patrix and the blocking counterdie that comprise horizontal positioned yoke class part forge die; It is characterized in that: at the outer edge of yoke class part, the die joint of upper and lower mould is positioned at part symmetrical centre face up and down; At the die joint of fork ear portions inner ring, promptly be the inner ring of U word, the blocking patrix stretches out a circle downwards, a circle of the downward recessed corresponding height of blocking counterdie.

The forging and pressing process of forge die has characteristics like this, and the blank that ejection is good is placed in the blocker, then, along with the descending of blocking patrix exerted pressure to blank gradually, blank just squeezed respectively with the counter die cavity of clamp-oning counterdie and patrix in.But owing to metal flow property and the reasons such as frictional resistance of material in mould; Raw metal is up filling easily in extrusion process, and the full condition of blocking patrix is better than counterdie, when this finally causes finish forging; Patrix is full of; But the counterdie part does not also have abundance, causes to lack material, and percent defective has improved.Therefore, the present invention has proposed in the art first: at the outer edge of yoke class part, the die joint of upper and lower mould is positioned at part symmetrical centre face up and down; The outer ring that can guarantee part can the demoulding, even be that circular axle is also unaffected, and at the die joint of fork ear portions inner ring, promptly is the inner ring of U word, and the blocking patrix stretches out a circle downwards, a circle of the downward recessed corresponding height of blocking counterdie.The relative counterdie of the degree of depth of patrix is dark; Patrix receives the bigger extruding force of relative counterdie in forging process; Even it is more plentiful, sufficient that the last mold cavity degree of depth deeply also can obtain, the finished product of any surface finish, and the blocking counterdie shoals owing to the degree of depth; Even filling power is little, also can reach full, the bright and clean lower surface of finished product in more shallow inner chamber.

The counterdie fork portion of blocking mould of the present invention opens the fork portion that part that the mould die joint in the shelves reduces equals the patrix co-located and opens a grade die joint protrusion height; Total flash thickness of mould is constant up and down; Just subrange becomes the branch mould that is curved surface, and other local die cavity divides the mould arc transition with an angle inclined-plane.

Further, establish the blocking patrix and stretch out a circle downwards, or the height of saying the recessed downwards circle of blocking counterdie is H

H=0.1a+0.006b then

Wherein: the depth capacity that a divides mould one side inner chamber for fork ear piece symmetrical plane

B is fork ear piece minimal wall thickness.

Under above condition, can forge all smooth, full, the qualified product of upper and lower surfaces.

Beneficial effect of the present invention: under equal materials situation, this kind mould structure more helps metal and is full of die cavity, reduces the forging scrappage; The overlap width is littler, and horizontal projected area is littler, reduces equipment tonnage; The mould bearing load is littler, increase die life, and overlap is little; More save material, practice thrift cost.

Because the recessed downwards circle of blocking counterdie; It is plain block in the middle of the counterdie step of depression that faces down; When the big or small multidiameter shape blank that when blocking, will be similar to grenade is put into counterdie, put into this recess step face just, make blank centering, location very naturally; Be convenient to blocking and be pressed into shape processing, this structure has also solved the hard nut to crack that original blank is put skew, shakiness.Had two very advantages of high-lighting, as previously mentioned, each field application market is extremely extensive in the whole world for the yoke forging; Quantity is extremely huge; Therefore, along with application, the enforcement of present technique, the economic worth of its generation and social benefit (saving of mass energy) are very big.

Description of drawings

Fig. 1 is the structural front view of yoke class part forging part;

Fig. 2 is the left view of Fig. 1;

Fig. 3 is the vertical view of Fig. 1;

Fig. 4 is a prior art yoke class part forging part, and the master of blocker cooperation looks sketch map up and down;

Fig. 5 is a prior art yoke class part forging part, up and down the schematic top plan view of blocker cooperation;

Fig. 6 is a yoke class part forging part of the present invention, and the master of blocker cooperation looks sketch map up and down;

Fig. 7 is a yoke class part forging part of the present invention, the schematic top plan view that cooperates of blocker up and down, and this figure can demonstrate many recessed outline lines in fork ear end than Fig. 5, and formation is to step surface of lower recess;

Fig. 8 is the A-A profile of Fig. 5;

Fig. 9 is the B-B profile of Fig. 7, can find out that the die joint blocking patrix of fork ear portions inner ring stretches out a circle downwards, a circle of the downward recessed corresponding height of blocking counterdie.

The specific embodiment

Below in conjunction with accompanying drawing further explain structure of the present invention.

The blocking mould structure of a kind of yoke class part forging part processing comprises the blocking upper die and lower die of horizontal positioned yoke class part forge die, and at the outer edge of yoke class part, the die joint of upper and lower mould is positioned at part symmetrical centre face up and down; At the die joint of fork ear portions inner ring, promptly be the inner ring of U word, the blocking patrix stretches out a circle downwards, a circle of the downward recessed corresponding height of blocking counterdie.

If said blocking patrix stretches out a circle downwards, or the height of saying the recessed downwards circle of blocking counterdie is H

H=0.1a+0.006b then

Wherein: the depth capacity that a divides mould one side inner chamber for fork ear piece symmetrical plane

B is fork ear piece minimal wall thickness.

Embodiment: for the yoke spare of automobile FB sleeve pipe forked type and AK1202 type; Through stretching H under the employing blocker die joint is 2.2 millimeters and 5.5 millimeters; Container ship colligation 1604,1608 profile shafts fork is 3.1 millimeters through stretching H under the employing blocker die joint; Still on the pressure of hot die forging machine equipment of original tonnage, process, all eliminated the insufficient defective of upper surface, this index qualification rate reaches absolutely; And originally both qualification rates were merely 88% to 92%, and the offset problem of blank also no longer existed during operation was put.Have this visible, one seems inconspicuous improvement, has obtained extremely huge excellent results.

Claims (2)

1. the blocking mould structure of yoke class part forging part processing; The upper die and lower die that comprise horizontal positioned yoke class part forge die; It is characterized in that: at the outer edge of yoke class part, the die joint of blocking upper and lower mould is positioned at part symmetrical centre face up and down; At the die joint of fork ear portions inner ring, promptly be the inner ring of U word, the blocking patrix stretches out a circle downwards, a circle of the downward recessed corresponding height of blocking counterdie.

2. according to the blocking mould structure of the said yoke class of claim 1 part forging part processing, it is characterized in that establishing said blocking patrix and stretch out a circle downwards, or say the blocking counterdie downwards the height of a recessed circle be H

H=0.1a+0.006b then

Wherein: the depth capacity that a divides mould one side inner chamber for fork ear piece symmetrical plane

B is fork ear piece minimal wall thickness.

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