阅读说明：本技术 一体式万向节叉头冷镦成型方法 (Cold heading forming method for fork head of integrated universal joint ) 是由 陈昭旭 于 2020-05-22 设计创作，主要内容包括：本发明公开了一种一体式万向节叉头冷镦成型方法,它使用冷镦机加工一体式万向节叉头,包括取料、毛坯预成型、毛坯整形、叉头槽形定位及叉头槽拉伸等步骤。本发明得到的一体式万向节叉头冷镦成型方法,采用逐步冷镦成型的方法,可以利用多工位的形式,在冷镦机上直接加工出万向节叉头,提高了生产效率,节约了生产成本。(The invention discloses a cold heading forming method of an integrated universal joint fork head, which uses a cold heading machine to process the integrated universal joint fork head and comprises the steps of material taking, blank preforming, blank shaping, fork head groove shape positioning, fork head groove stretching and the like. The integrated universal joint fork cold heading forming method provided by the invention adopts a gradual cold heading forming method, and can directly process the universal joint fork on a cold heading machine in a multi-station mode, so that the production efficiency is improved, and the production cost is saved.)

1. The cold heading forming method of the integrated universal joint fork comprises the step of machining the integrated universal joint fork by using a cold heading machine, and is characterized by comprising the following steps of:

a. taking materials, namely feeding cylindrical bars into a cold header;

b. performing a fork blank, namely processing a bar material into the fork blank, wherein the fork blank comprises a blank section (1) with a rectangular section and the length and width dimensions of the blank section are larger than the diameter of the bar material, and a shaft section (2) which is still cylindrical;

c. the fork head blank shaping refers to trimming a blank formed at one end of a bar, and mainly comprises upsetting and flattening the end part of a blank section (1) and smoothing the joint of the blank section (1) and a shaft section (2) through upsetting;

d. fork head groove-shaped positioning refers to that a positioning groove (3) for further processing is formed at the end part of the blank section (1) in an upsetting mode;

e. and (3) stretching the fork head groove, namely stretching the metal on the two sides of the positioning groove (3) to form the fork head groove (4), and processing the fork head blank into the universal joint fork head meeting the size requirement.

2. The cold heading forming method for the fork head of the integral universal joint as claimed in claim 1, characterized by further comprising the steps of:

f. and (3) cold heading a tooth form on the shaft section (2) of the fork head blank so as to process the shaft section (2) into an external spline shaft.

3. The cold heading forming method for the fork head of the integral universal joint as claimed in claim 1 or 2, wherein before the step b, the fork head blank is preformed, the method further comprises the following steps:

g. the end of the cylindrical bar is chamfered.

4. The cold heading forming method for the fork head of the integral universal joint as claimed in claim 1 or 2, wherein in the step d, in the process of positioning the fork head in the groove shape, the fork head blank at the bottom of the positioning groove (3) is further subjected to bulging in a circle, so that the fork head blank is provided with a circular arc surface (5) which is axially the same as the shaft section (2).

5. The cold heading forming method for the fork head of the integral universal joint as claimed in claim 3, wherein in the step d, in the process of positioning the fork head in the groove shape, the fork head blank at the bottom of the positioning groove (3) is further subjected to bulging and rounding, so that the fork head blank is provided with a circular arc surface (5) which is axially the same as the shaft section (2).

6. The cold heading forming method for the fork head of the integral universal joint as claimed in claim 1 or 2, wherein when the fork head groove is stretched in the step e, arc-shaped concave surfaces (6) are further extruded on two side walls of the positioning groove (3) which is stretched to form the fork head groove (4).

7. The cold heading forming method for the fork head of the integral universal joint as claimed in claim 5, wherein when the fork head groove is stretched in the step e, circular arc-shaped concave surfaces (6) are further extruded on two side walls of the positioning groove (3) which is stretched to form the fork head groove (4).

Technical Field

The invention relates to a cold heading processing method of a metal part, in particular to a cold heading forming method of an integrated universal joint fork.

Background

The traditional universal joint is processed by mainly adopting the modes of turning, milling, hot forging, casting and the like, so that the loss of metal materials is large, part of processes need to be finished for many times, and the production efficiency is low on the premise of ensuring the precision.

Disclosure of Invention

The invention aims to solve the defects of the prior art and provide the cold heading forming method of the integrated universal joint fork head with small material loss and high production speed.

In order to achieve the purpose, the invention discloses a cold heading forming method of an integrated universal joint fork head, which uses a cold heading machine to process the integrated universal joint fork head, and comprises the following steps:

a. taking materials, namely feeding cylindrical bars into a cold header;

b. performing a fork blank, namely processing a bar into the fork blank, wherein the fork blank comprises a blank section with a rectangular section and the length and width dimensions of the blank section are larger than the diameter of the bar and a shaft section which is still cylindrical;

c. the fork head blank shaping refers to trimming a blank formed at one end of a bar, and mainly comprises the steps of upsetting and flattening the end part of a blank section, and smoothing the joint of the blank section and a shaft section through upsetting;

d. positioning the fork head in a groove shape, namely upsetting and extruding a positioning groove for further processing at the end part of the blank section;

e. and (4) stretching the fork head groove, namely stretching the metal on the two sides of the positioning groove to form the fork head groove, and processing the fork head blank into the universal joint fork head meeting the size requirement.

The method also comprises the following steps: f. and (3) cold upsetting tooth shapes on the shaft sections of the fork head blank so as to process the shaft sections into the external spline shaft.

In order to protect the cold header and reduce the abrasion of the die, before the fork head blank is preformed in the step b, the method further comprises the following steps: g. the end of the cylindrical bar is chamfered.

In order to facilitate positioning and improve the stress of the fork head blank in cold heading, in the step d, in the fork head groove-shaped positioning process, the fork head blank at the bottom of the positioning groove is bulged to form an arc surface which is the same as the axial direction of the shaft section.

And e, when the fork head groove is stretched, extruding arc-shaped concave surfaces on two side walls of the positioning groove which is elongated to form the fork head groove.

The integrated universal joint fork cold heading forming method provided by the invention adopts a gradual cold heading forming method, and can directly process the universal joint fork on a cold heading machine in a multi-station mode, so that the production efficiency is improved, and the production cost is saved.

Drawings

FIG. 1 is a flow chart of an embodiment 1 of the cold heading forming method of the integral type universal joint fork head of the invention;

FIG. 2 is a die diagram of example 1;

FIG. 3 is a flow chart of an embodiment 2 of the cold heading forming method of the integral type universal joint fork head of the invention;

FIG. 4 is a die diagram of example 2;

FIG. 5 is a die diagram of a partial process of an embodiment 3 of the cold heading forming method for an integral universal joint fork head according to the invention.

In the figure: the device comprises a blank section 1, a shaft section 2, a positioning groove 3, a jaw groove 4, an arc surface 5 and an arc concave surface 6.

Detailed Description

The invention is further illustrated with reference to the following figures and examples.