CN2356779Y

CN2356779Y - Variable tooth type screw axial feed thread rolling die

Info

Publication number: CN2356779Y
Application number: CN 98221869
Authority: CN
Inventors: 王雪云; 徐守仁
Original assignee: Individual
Current assignee: Individual
Priority date: 1998-07-16
Filing date: 1998-07-16
Publication date: 2000-01-05
Anticipated expiration: 2008-07-16

Abstract

The utility model relates to a variable tooth type screw axial feed thread rolling die, which comprises a thread rolling die. The utility model is characterized in that the tooth tops of a first tooth of the start to an n tooth of the end of a cutting part b 1 are gradually pointed, and a deformation range can be selected in a range of over zero to tooth bottom. The limitation of metal plastic deformation makes some workpieces of which the tooth distances are larger and the tooth-shaped angles are smaller difficultly moulded in a cold rolling mode, such as an adjustment worm rod of a monkey spanner. The adoption of the variable tooth type screw axial feed thread rolling die of the utility model can effectively solve the difficulty.

Description

Become profile of tooth spiral axial feed thread rolling die

The utility model is the thread rolling die that is used for machining, is the improvement to existing thread rolling die structure.

The profile of tooth of existing thread rolling die is constant, and its tooth top is flat, and the quadrature pressure when contacting roll extrusion with workpiece is difficult to flow to flank, causes workpiece to be difficult to moulding, and die life is low.

The purpose of this utility model is in order to solve above-mentioned existing problems, a kind of shape changeable propeller axial feed thread rolling die to be provided.It can realize that workpiece is easy to moulding, improves purposes such as die life.

In order to achieve the above object, the utility model comprises thread rolling die, it is characterized in that cutting part b ₁The 1st tooth of beginning to the tooth top of terminal n tooth comes to a point by tooth, and deformation range is extremely being selected in the scope at the bottom of the tooth greater than zero.

The utlity model has following advantage and good effect: the tooth of incision part is to become profile of tooth, deepens by tooth from the 1---n tooth, deepens range of choice and exceeds at the bottom of tooth, and the tooth of least significant end can be deepened at the bottom of the tooth; Also can be less than at the bottom of the tooth.The tooth of incision part like this comes to a point by tooth, so when contact workpiece carried out roll extrusion, the sharp-tooth shaped wedging workpiece while, metal flow was convenient, resistance is little.So workpiece is easy to roll forming, and the service life of having improved thread rolling die.

Fig. 1 is the half sectional view of the utility model thread rolling die.

1, thread rolling die; b ₁The incision part; b ₂Shaping unit; b ₃Withdraw from part; The oblique angle of θ 1 incision part; θ ₂Withdraw from the oblique angle of part; The α workpiece requires profile angle; The profile angle that α ' thread rolling die changes; P pitch.

Referring to Fig. 1, the incision part b of thread rolling die 1 ₁Tooth be out of shape, crest top land comes to a point by tooth.Deformation range greater than zero at the bottom of tooth, selecting in the scope.If select terminal n tooth to be deformed at the bottom of the tooth, the tooth two sides of n tooth is deformed at the bottom of the tooth exactly, and certainly, the distortion of the n tooth of least significant end also can be less than at the bottom of the tooth.

Because the limitation of metal plastic deformation makes some tooth pitches bigger, the less again workpiece of profile angle is difficult to carry out the cold rolling moulding, for example the adjustment worm screw of adjustable wrench.And adopt the utility model to become profile of tooth spiral axial feed thread rolling die, then can solve this difficulty effectively.

Claims

1, a kind of change profile of tooth spiral axial feed thread rolling die, it comprises thread rolling die (1), it is characterized in that cutting part b ₁The 1st tooth of beginning to the tooth top of terminal n tooth comes to a point by tooth, and deformation range is extremely being selected in the scope at the bottom of the tooth greater than zero.