CN210676797U - Novel structure of transmission shaft universal joint fork forging pre-forging die bridge part - Google Patents

Abstract

Drive shaft universal joint fork forging preforging die bridge part new construction, including the die body, the open die cavity in top has been seted up at die body top surface middle part, half slot and latter half circular slot before half slot and latter half circular slot have been seted up respectively at the front side of die cavity at die body top and rear side, symmetry and central line coincidence around preceding half slot and the latter half circular slot, the bottom rear side of half slot and the bottom front side of latter half circular slot are provided with preceding arc type lug and back arc type lug respectively in the front, preceding arc type lug back side contacts with die cavity front side, back arc type lug front side contacts with die cavity back side. The utility model optimizes the product structure, reduces the forming force, is beneficial to forming a deep cavity, reduces the damage to the equipment and improves the yield of products; the universal joint fork has the advantages that metal can flow to the bottom of the universal joint fork conveniently, the forming rate and the material utilization rate of a forge piece are improved, and the phenomenon that a die cracks in the forging process is reduced.

Description

Novel structure of transmission shaft universal joint fork forging pre-forging die bridge part

Technical Field

The utility model belongs to the technical field of auto industry accessories, concretely relates to transmission shaft universal joint fork forging preforging die bridge portion new construction.

Background

The cross section structure of cooperation between terrace die and the die of the universal joint fork forging preliminary forging process of current structure is shown as figure 1, has 5mm clearance (die parting mouth 3) between die body 1 bottom (become bridge in the trade) and terrace die body 2, and the preliminary forging bridge of this structure has following problem:

1. the schematic diagram of the universal joint fork forging is shown in fig. 2 and 3, a part A in fig. 3 is the position where the forging is most difficult to fill, when metal flows to the tail in the forging process, because the gap of the die parting port 3 is 5mm, when the metal is formed by pre-forging and striking, the metal transversely flows to the outside of the cavity along the die parting port 3, the metal flows to the side too fast, the amount of the metal flowing downwards is reduced, the part A in fig. 3 is difficult to fill, the bottom surface and the inner side of the bottom of the universal joint fork forging are easy to lack of materials, the bottom surface and the inner side of the bottom of the forging have a black skin phenomenon in the metalworking process, and due to the particularity of the technological requirement of the forging, the reworking treatment cannot be adopted, and the rejection rate of the forging is very.

2. Because the clearance of die parting 3 is too big, the metal flows very fast, just leads to this position to forge the wearing and tearing very fast of in-process, easily causes this position of die body 1 fatigue, is difficult for the demolding, leads to simultaneously that the process of cutting edge is placed not smooth, and the rejection rate that die body 1 later stage was cut edge and is caused is high.

In order to make the universal joint fork afterbody be full of, the workman need increase blank weight and preforging shaping pressure just can make the forging that produces satisfy the requirement, but such way can bring more serious result, make the department stress concentration that the universal joint fork forging corresponds, just produce the crackle about the mould production 500 of this position, the workman need grind the mould crackle of this department repeatedly, cause the mould life-span to reduce, cause the mould to follow the deepest fracture of universal joint fork forging die cavity in serious, cause the mould to scrap, increase production process cost.

SUMMERY OF THE UTILITY MODEL

The utility model discloses a solve the weak point among the prior art, provide a transmission shaft universal joint fork forging preforging die bridge part new construction that reduces preforging forming pressure, extension mould life-span, reduce the forging rejection rate.

In order to solve the technical problem, the utility model adopts the following technical scheme: drive shaft universal joint fork forging preforging die bridge part new construction, including the die body, the open die cavity in top has been seted up at die body top surface middle part, half slot and latter half circular slot before half slot and latter half circular slot have been seted up respectively at the front side of die cavity at die body top and rear side, symmetry and central line coincidence around preceding half slot and the latter half circular slot, the bottom rear side of half slot and the bottom front side of latter half circular slot are provided with preceding arc type lug and back arc type lug respectively in the front, preceding arc type lug back side contacts with die cavity front side, back arc type lug front side contacts with die cavity back side.

The front arc-shaped lug and the rear arc-shaped lug are symmetrically arranged in front and back of the center of the female die cavity, the width of the front arc-shaped lug and the width of the rear arc-shaped lug are 30mm, and the linear distance between the left end and the right end of the front arc-shaped lug and the right end of the rear arc-shaped lug are 114 mm.

The thickness of the bottom of the front arc lug and the bottom of the rear arc lug are gradually thinned from the bottommost part to the left side and the right side, the thickness of the thickest part of the bottom of the front arc lug and the bottom of the rear arc lug is 3mm, the left side edge and the right side edge of the front arc lug are in smooth transition with the surface of the front semicircular groove, and the left side edge and the right side edge of the rear arc lug are in smooth transition with the surface of the rear semicircular groove.

Adopt above-mentioned technical scheme, in order to make the quick effectual die cavity that is full of blank, the utility model discloses preceding semicircle flute and the latter half of a circle groove bottom (bridge portion) at the die body set up preceding arc lug and back arc lug respectively, can reduce the clearance of die orifice 3 like this, thereby increase the resistance that the metal flows outside the die cavity (including die cavity and die cavity), let more metals flow to die cavity depths (bottom), be convenient for the position A shaping of universal joint fork forging in figure 3, on the other hand has also prolonged the live time of terrace die body and die body, thereby improve the mould life, reduce the forging rejection rate, improve workman's production efficiency, obtain a low cost simultaneously, the fashioned universal joint fork forging of being convenient for.

The utility model optimizes the product structure by using a numerical simulation analysis method, reduces the forming force, is beneficial to forming a deep cavity, reduces the damage to equipment and improves the yield of products; through tests, the service life of the die of the improved universal joint fork forging piece is doubled, and the cost is effectively reduced; the labor intensity of workers is greatly reduced, the production efficiency is improved, and the number of forge pieces produced in each shift is improved to about 1350 from 750 original forge pieces; the universal joint fork has the advantages that metal can flow to the bottom of the universal joint fork conveniently, the forming rate and the material utilization rate of a forge piece are improved, and the phenomenon that a die cracks in the forging process is reduced.

Drawings

FIG. 1 is a schematic cross-sectional structure diagram of the fit between a male die and a female die in a pre-forging process of a conventional universal joint fork forging;

FIG. 2 is a schematic structural view of a prior art yoke forging;

FIG. 3 is a side view of FIG. 2;

FIG. 4 is a schematic structural view of a male mold;

fig. 5 is a top view of the present invention;

fig. 6 is a schematic perspective view of the present invention;

FIG. 7 is a schematic cross-sectional structure diagram of the cooperation between the male die and the female die of the improved preforging process of the universal joint fork forging.

Detailed Description

As shown in fig. 5, fig. 6 and fig. 7, the utility model discloses a transmission shaft universal joint fork forging preforging die bridge part new construction, including die body 1, the open die cavity 9 in top has been seted up at 1 top surface middle part of die body, half slot 4 and latter half circular slot 5 before die cavity 9's front side and rear side are seted up respectively at 1 top of die body, symmetry and central line coincidence around preceding half slot 4 and the latter half circular slot 5, half slot 4's bottom rear side and latter half circular slot 5's bottom front side are provided with preceding arc type lug 6 and back arc type lug 7 respectively in the front, preceding arc type lug 6 back side contacts with die cavity 9 front side, back arc type lug 7 front side contacts with die cavity 9 back side.

The front arc-shaped lug 6 and the rear arc-shaped lug 7 are symmetrically arranged in front and back of the center of the female die cavity 9, the width of the front arc-shaped lug 6 and the width of the rear arc-shaped lug 7 are 30mm, and the linear distance between the left end and the right end of the front arc-shaped lug 6 and the right end of the rear arc-shaped lug 7 is 114 mm.

The thickness of the bottoms of the front arc-shaped lug 6 and the rear arc-shaped lug 7 is gradually reduced from the bottommost part to the left side and the right side, the thickness of the thickest part of the bottoms of the front arc-shaped lug 6 and the rear arc-shaped lug 7 is 3mm, the left side edge and the right side edge of the front arc-shaped lug 6 are in smooth transition with the surface of the front semicircular groove 4, and the left side edge and the right side edge of the rear arc-shaped lug 7 are in smooth transition with the surface of the rear semicircular groove 5.

In order to make the blank quick effectual be full of die cavity 9, the utility model discloses preceding semicircle flute 4 and the 5 bottoms (bridge portion) of latter half circular groove at die body 1 set up preceding arc type lug 6 and back arc type lug 7 respectively, can reduce the clearance of die orifice 3 like this, thereby increase the resistance that the metal flows outside the die cavity (including die cavity 9 and convex mould cavity 8), let more metal flow to die cavity 9 depth (bottom), be convenient for the position A shaping of universal joint fork forging in the figure 3, on the other hand has also prolonged terrace die body 2 and die body 1's live time, thereby improve the mould life-span, reduce the forging rejection rate, improve workman's production efficiency, obtain a low cost simultaneously, the fashioned universal joint fork forging of being convenient for.

The width of the front arc-shaped lug 6 and the width of the rear arc-shaped lug 7 are 30mm, the linear distance between the left end and the right end of the front arc-shaped lug 6 and the rear arc-shaped lug 7 is 114mm, the thickness of the thickest part at the bottom of the front arc-shaped lug 6 and the bottom of the rear arc-shaped lug 7 is 3mm, the technical parameters can achieve the effect of reducing the gap (minimum 2 mm) of the split die opening 3, and metal can be split to the front side and the rear side through the split die opening 3.

The present embodiment is not intended to limit the shape, material, structure, etc. of the present invention in any form, and all of the technical matters of the present invention belong to the protection scope of the present invention to any simple modification, equivalent change and modification made by the above embodiments.

Claims (3)

1. Drive shaft universal joint fork forging preforging die bridge part new construction, including the die body, the open die cavity in top has been seted up at die body top surface middle part, half slot and latter half slot before half slot and latter half slot have been seted up respectively at the front side and the rear side of die cavity at die body top, symmetry and central line coincidence around preceding half slot and the latter half slot, its characterized in that: the rear side of the bottom of the front semicircular groove and the front side of the bottom of the rear semicircular groove are respectively provided with a front arc lug and a rear arc lug, the rear side edge of the front arc lug is contacted with the front side edge of the female die cavity, and the front side edge of the rear arc lug is contacted with the rear side edge of the female die cavity.

2. The new structure of the pre-forged die bridge part of the transmission shaft universal joint fork forging piece according to claim 1, characterized in that: the front arc-shaped lug and the rear arc-shaped lug are symmetrically arranged in front and back of the center of the female die cavity, the width of the front arc-shaped lug and the width of the rear arc-shaped lug are 30mm, and the linear distance between the left end and the right end of the front arc-shaped lug and the right end of the rear arc-shaped lug are 114 mm.

3. The new structure of the pre-forged die bridge part of the transmission shaft universal joint fork forging piece according to claim 2, characterized in that: the thickness of the bottom of the front arc lug and the bottom of the rear arc lug are gradually thinned from the bottommost part to the left side and the right side, the thickness of the thickest part of the bottom of the front arc lug and the bottom of the rear arc lug is 3mm, the left side edge and the right side edge of the front arc lug are in smooth transition with the surface of the front semicircular groove, and the left side edge and the right side edge of the rear arc lug are in smooth transition with the surface of the rear semicircular groove.

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