CN112439867A

CN112439867A - Forming method of universal joint

Info

Publication number: CN112439867A
Application number: CN202011634268.2A
Authority: CN
Inventors: 陈杨忠
Original assignee: Jinhua Zhongxin Hardware Tools Co ltd
Current assignee: Jinhua Zhongxin Hardware Tools Co ltd
Priority date: 2020-12-31
Filing date: 2020-12-31
Publication date: 2021-03-05

Abstract

The invention discloses a forming method of a universal joint, which comprises the working procedures of shaping and edge bundling, flattening, square pressing, through hole and the like.

Description

Forming method of universal joint

Technical Field

The invention relates to the field of production of mechanical parts by adopting a cold extrusion molding process, in particular to a molding method of a universal joint.

Background

The universal joint is a commonly used tool, at present, the universal joint is manufactured by generally adopting a turning and planing milling mode or a pouring molding mode, the profile is low in density in the pouring molding mode, the whole quality is poor, the procedures are multiple in the turning and planing milling mode, especially the machining difficulty of square holes and connecting parts is large, the efficiency is low, the waste of raw materials is great by using the traditional turning and planing milling machining means, and the cost is higher.

Disclosure of Invention

In order to solve the problems, the invention provides a universal joint forming method which can save raw materials, reduce the production cost and improve the product quality.

The technical scheme adopted by the invention is as follows: a forming method of a universal joint comprises the step of forming a universal joint material part by material breaking, and after the material breaking, the following cold extrusion treatment is carried out:

A. shaping and edge-binding two ends of the material part to form chamfers at the two ends,

B. one end of the material part is contracted twice or three times to form a contracted rod part, so that the contracted rod part forms a cone structure, the diameter of the contracted rod part is gradually increased from the end part to the middle part,

C. flattening the middle part of the reduced rod part to form a connecting groove, wherein two sides of the connecting groove are side walls which are not flattened, and radian transition is formed from two sides of the side walls to the excircle of the non-reduced rod part;

D. a positioning hole is pressed on the end surface of the end of the non-shrinkage rod,

E. on the basis of the positioning hole, a square hole is pressed out,

F. pressing the holes in the reverse direction of the square holes, cutting off the waste materials to enable the square holes to be communicated with the holes,

and typing on the surface of the non-rod-retracting part of the material piece.

Compared with the prior art, the invention has the following beneficial effects:

cold extrusion is a plastic working process, which plastically transfers the volume of metal without destroying the property of the metal, so as to form the metal with less cutting and no cutting. Thus, a large amount of metal scraps are avoided during cutting and processing, and a large amount of steel and various metal materials are saved.

The universal joint is designed aiming at the working position and the working procedure arrangement is one of the key points of cold extrusion, the invention reasonably outlines the working procedure of the working position, so that the universal joint can be manufactured by adopting a cold extrusion method, has high speed, high precision and high production efficiency, does not adopt traditional processes such as turning, planning and milling and the like, greatly saves raw materials and reduces the production cost. And cold extrusion makes metal material produce plastic deformation, makes metal internal structure change, has improved more in the aspect of the pulling force, and the square hole that forms and the mechanical properties of connecting portion are very good, have ensured product quality, make the product have more advantage on the use function.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

FIG. 1 is a process diagram of the present invention.

The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.

In addition, the descriptions related to "first", "second", etc. in the present invention are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.

The method comprises the step of cutting the material to form a cold extrusion material part, wherein the used raw material is a steel section with a circular section. After the material is broken, it is cold extruded according to the process of the invention. For the material piece, the upper end surface is a front end surface, the lower end surface is a rear end surface, the upper end of the material piece is the front end or the head of the material piece, the lower end of the material piece is the rear end or the tail of the material piece, the downward direction can be understood as the backward direction, and the upward direction can be understood as the forward direction; referring to fig. 1, the specific process after material breaking is as follows:

shaping and edge-binding, wherein the two ends of the material part are shaped and edge-bound to form chamfers 1, one end of the material part is shaped and edge-bound to form chamfers on a shaping station, and then the material part is rotated by 180 degrees to shape and edge-bound to form chamfers on the other end of the material part;

the taper head is used for performing two or three times of rod shrinkage on one end of the material part to form a rod shrinkage part 3, so that the rod shrinkage part 3 forms a cone structure, and the diameter of the rod shrinkage part 3 is gradually increased from the end part to the middle part of the rod shrinkage part, thereby forming a connected outer contour;

flattening, flattening the middle part of the rod reducing part to form a connecting groove 4, wherein two sides of the connecting groove 4 are side walls 5 which are not flattened, and radian transition 2 is formed from two sides of the side walls 5 to the excircle of the non-rod reducing part 10;

pressing a positioning hole, namely pressing a positioning hole 6 on the end face of the non-shrinkage rod part 10 end so as to press a square hole;

pressing a square, namely pressing a square hole 7 on the basis of the positioning hole 6,

a through hole, pressing the hole 8 in the reverse direction of the square hole 7, and cutting off the scrap so that the square hole 7 communicates with the hole 8,

typing, namely typing 9 on the surface of the non-rod-retracting part of the material piece;

the invention is provided with the above procedures, and all the procedures are completed on one station, thereby realizing one-time molding, namely, cold extrusion dies required by all the procedures are arranged on one machine at one time, and the material piece is conveyed to the dies on all the procedures at one time through a conveying tool for cold extrusion.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims

1. A forming method of a universal joint is characterized by comprising the step of forming a universal joint material part by material breaking, and after the material breaking, the following cold extrusion treatment is carried out:

A. shaping and edge-binding two ends of the material part to form chamfers (1) at the two ends,

B. one end of the material part is contracted twice or three times to form a contracted rod part (3), so that the contracted rod part (3) forms a cone structure, the diameter of the contracted rod part is gradually increased from the end part to the middle part,

C. flattening the middle part of the reduced rod part to form a connecting groove (4), wherein two sides of the connecting groove (4) are side walls (5) which are not flattened, and radian transition (2) is formed from two sides of each side wall (5) to the excircle of the non-reduced rod part;

D. a positioning hole (6) is pressed on the end surface of the end of the non-shrinkage rod,

E. a square hole (7) is pressed out on the basis of the positioning hole (6),

F. reversely pressing the hole (8) in the square hole (7), cutting off waste materials to enable the square hole (7) to be communicated with the hole (8),

typing (9) is carried out on the surface of the non-shrinkage rod part of the material piece.