CN-122007315-A - Flash-free cross shaft forging die and forging and molding method

CN122007315ACN 122007315 ACN122007315 ACN 122007315ACN-122007315-A

Abstract

The invention relates to the field of forging and molding, in particular to a flash-free cross shaft forging die and a forging and molding method. The die comprises an upper die part formed by an upper die and an upper die seat, and a lower die part formed by a lower die and a lower die seat, wherein an upper cross shaft cavity is arranged on the bottom surface of the upper die, a corresponding lower cross shaft cavity is arranged on the bottom surface of the lower die, a shunting column is arranged at the joint of the shaft neck of the lower cross shaft cavity and an adjacent middle boss, and a shunting column hole corresponding to the shunting column is arranged at the joint of the shaft neck of the upper cross shaft cavity and the adjacent middle boss. The invention also provides a forging die pressing method using the forging die. The invention has the advantages of extremely simple structure, easy transformation, effective solution of the flash problem in the molding process, high material utilization rate, good metal flow linearity, short machining period and low production cost.

Inventors

ZHANG GUANGSEN
PU XUMING
ZHAO YANFENG
DUAN LAISHAN
QI BO
NIE WEI
BAI YU

Assignees

武汉重工铸锻有限责任公司

Dates

Publication Date: 20260512
Application Date: 20260330

Claims (8)

1. The utility model provides a no overlap cross forging mould, includes the last mould part that comprises last mould and upper die base, and the lower mould part that comprises lower mould and lower die base, its characterized in that, the bottom surface of going up the mould is equipped with the cross die cavity, and the bottom surface of lower mould is equipped with the lower cross die cavity that corresponds, the axle journal of lower cross die cavity all is equipped with the reposition of redundant personnel post with adjacent middle boss junction, the axle journal of last cross die cavity with adjacent middle boss junction be equipped with the reposition of redundant personnel post hole that the reposition of redundant personnel post corresponds.
2. The flash-free cross forging die as recited in claim 1, wherein an inner arc surface of the split column is consistent with an inner arc surface of a junction of a journal of the lower cross cavity and the intermediate boss.
3. The flash-free cross forging die as recited in claim 1, wherein the split post is an interference fit with the split post bore.
4. A flashless cross forging die according to any one of claims 1-3, wherein a dovetail is provided on a top surface of said upper die and a dovetail groove is provided on a bottom surface of said upper die holder.
5. The flashless cross forging die as recited in claim 4, wherein a tapered iron wedge is further interposed between the dovetail and one side of the dovetail slot.
6. The flash-free cross shaft forging die as recited in claim 5, wherein the top surface edge of the upper die is provided with an upper die key slot, the bottom surface edge of the upper die base is provided with a corresponding upper die base key slot, and the flat key is inserted into the corresponding upper die key slot and the upper die base key slot.
7. A flash-free cross shaft forging die as recited in any one of claims 1-3, wherein the lower die holder is provided with a lower die holder groove, the lower end of the lower die is inserted into the lower die holder, the outer circular surface of the lower die is provided with an axial narrow side, the inner circular surface of the lower die holder groove is correspondingly provided with an axial key groove, and the narrow side is correspondingly inserted into the key groove.
8. A forging press molding method of a flangeless cross-shaft, characterized in that the flangeless cross-shaft forging die according to any one of claims 1 to 7 is used, and the following steps are performed: Step 1, operating a press to align the upper surface of an upper die with the lower surface of a lower die; And 2, clamping the blank by using a jaw, placing the blank into the center of a lower cross shaft cavity of a lower die, operating a press to enable an upper die to move towards the lower die, and uniformly pressing the blank into each shaft neck and middle boss under the guiding and splitting of the split column in the downward pressing process until the upper die and the lower die are clamped, and forming the cross shaft in one step.

Description

Flash-free cross shaft forging die and forging and molding method Technical Field The invention relates to the field of forging and molding, in particular to a flash-free cross shaft forging die and a forging and molding method. Background The cross shaft is a key component in the cross shaft connector system, and the use amount of the cross shaft connector transmission system is gradually increased along with the wide application of the cross shaft connector transmission system in various industries such as metallurgy and the like. In recent years, forging factories have been devoted to research on a forging method of a cross shaft, and through continuous efforts for several years, the production mode of the cross shaft is from the direct forging of steel ingots in the original hammer forging factory to the current cogging and blanking production by a hydraulic press, and although the external dimension can barely meet the requirements of customers, the utilization rate of the steel ingots is low, the production cost is high, and the delivery period is long The production method of the large-sized cross shaft in China mainly comprises the steps of free forging or adopting a die forging forming method, and the large cross shaft forged by the traditional flat die has many defects of difficult forging of four-sided cylinders of the cross shaft due to the fact that the flat die forging is difficult in the forging process, low in material utilization rate and long in processing period after the forging forming, and when the die forging forming is adopted, due to the specificity of the structural shape of the cross shaft, if the using amount and the design amount of blanks are equal, the blanks are difficult to uniformly split into two journals and cavities of two middle bosses to be filled and compacted when the blanks are pressed down. Therefore, in order to ensure the molding precision, the usage amount of the blank is slightly larger than the design amount, so that excessive blank can overflow to the outside of the cross cavity (or overflow to a trimming groove outside of the cross cavity) under the action of pressure, and the problem of flash is inevitably caused. Therefore, the existing die forging forming process of the cross shaft needs to adopt the processes of preforming, finish forging forming, trimming and the like, the material utilization rate is slightly higher than that of free forging, but the flash ratio is higher, and the existing die forging forming process also needs a trimming process, so that the production cost is higher, the process is complex, more equipment is needed, and the production investment is large. Publication number 210231396U discloses a cross axle forging mould for use on friction press, and it is the inclined plane through the mould side, makes the shape of mould similar to the round platform, and the internal diameter of holding-down ring is greater than the minimum diameter of mould and is less than the maximum diameter of mould, when holding-down ring cover and fastening back on the mould, makes the position of mould fixed to solve the wrong mould and the aversion problem that adopts hasp location, the dovetailed locking mode to lead to. In the scheme, a guide post and a guide sleeve matched with the guide post are also arranged, but the guide post is only used for guiding the movement of the die, so that the movement accuracy is increased, and the problem of flash in the die pressing process is not solved. Disclosure of Invention The invention aims to solve the technical problems, and provides the flash-free cross shaft forging die which has the advantages of extremely simple structure, easiness in transformation, high material utilization rate, good metal flow linearity, short machining period and low production cost, and can effectively solve the flash problem in the die pressing process. The invention also provides a flash-free cross shaft forging die and a forging and molding method using the shaft forging die, which can omit the working procedures of preforming, trimming and the like, and can mold and mold the cross shaft at one time. The invention relates to a flash-free cross shaft forging die, which comprises an upper die part formed by an upper die and an upper die seat, and a lower die part formed by a lower die and a lower die seat, wherein an upper cross shaft cavity is arranged on the bottom surface of the upper die, a corresponding lower cross shaft cavity is arranged on the bottom surface of the lower die, split columns are arranged at the joints of the shaft necks of the lower cross shaft cavity and adjacent middle bosses, and split column holes corresponding to the split columns are arranged at the joints of the shaft necks of the upper cross shaft cavity and the adjacent middle bosses. The inner arc surface of the split column is consistent with the inner arc surface of the joint of the journal of the lower cross shaft cavity and the middle boss. The