CN201124211Y

CN201124211Y - Trapezoidal thread rolling mould

Info

Publication number: CN201124211Y
Application number: CNU2007201779263U
Authority: CN
Inventors: 朱志远
Original assignee: Individual
Current assignee: ZHIYUAN VALVE ACCESSORIES Co Ltd
Priority date: 2007-09-29
Filing date: 2007-09-29
Publication date: 2008-10-01
Anticipated expiration: 2017-09-29

Abstract

The utility model relates to a trapezoidal thread rolling die, comprising two same rolling die bodies which are of cylinder shapes, the axial direction of the rolling die bodies is provided with axle holes, the sides of the rolling die bodies have screw threads. The utility model is characterized in that: the section of the screw threads is cambered teeth the arch of which refers to isosceles arc-bed trapezoid; two waists of the trapezoid are straight lines; the upper bottom of the trapezoid is a pitch arc; the included angel between two adjacent cambered teeth is 30 degrees in the metricsystem standard, namely the thread form angle is 30 degrees; and in the American (AKM) standard, the included angle is 29 degrees, namely the thread form angle is 29 degrees. The trapezoidal thread rolling die is used for rolling screw threads of workpieces, the stress surface of the teeth of the rolling die is decreased, the rolling die is not easy to damage and the rolling speed is fastened; the workpieces processed by the rolling die have low paths of the teeth of the screw threads be of cambered shapes, so that the twisting resistance and the tensile resistance between the teeth of the workpieces are strengthened, and the service life of the work efficiency is improved.

Description

The acme thread roll die

Technical field

The utility model relates to a kind of rolling screw-threads mould, particularly a kind of acme thread roll die.

Background technology

Existing acme thread roll die such as Fig. 1 are shown in Figure 2, and this mould is made up of two identical roll extrusion die bodys 1.Roll extrusion die body 1 is cylindrical, roll extrusion die body 1 axially have an axis hole 2, the side of roll extrusion die body 1 is a screw thread, the section of screw thread is a trapezoidal shape tooth 4, the cusp face of tooth 4 is flat.The roll die of this structure, stress surface is very wide in the roll extrusion process, and the resistance of its roll extrusion is bigger, and the pressure of roll extrusion is also big, and the speed of roll extrusion is slowed down; In addition, the workpiece that utilizes existing mold to roll out, diametric plane also is flat at the bottom of the tooth of its screw thread, makes tooth and the anti-twist power between the tooth and the stretching resistance reduction of workpiece, and shortened the service life of workpiece.

Summary of the invention

The purpose of this utility model is to overcome that existing rolling screw-threads mould rolling speed is slow, roll die damages easily, the defective of the anti-twist power difference of its workpiece that rolls out, and the cusp face of inventing a kind of mould tooth is the acme thread roll die of circular arc.

The purpose of this utility model is to finish by following technical scheme: described acme thread roll die, form by two identical roll extrusion die bodys, the roll extrusion die body is cylindrical, the roll extrusion die body axially have an axis hole, the side of roll extrusion die body is a screw thread, it is characterized in that: the section of screw thread is the arc shape tooth.

Described arc shape tooth, its arc refer at the bottom of the isosceles arc trapezoidal, and these two trapezoidal waists are straight line, and upper base is a circular arc line.

The angle of the side of described two adjacent arc shape teeth is 30 degree when metric system standard, and promptly the tooth form angle is 30 degree; At made in U.S.A＜Ai Kemu〉during standard 29 degree, promptly the tooth form angle is 29 degree.

Good effect of the present utility model is as follows: the utility model is under the prerequisite of the tolerance 7E that does not change original acme thread and tooth form angle 30 degree or tolerance 2G and tooth form angle 29 degree, make the cusp of mould tooth make arc surface into by the plane, like this when roll extrusion workpiece screw thread, the stress surface of roll die tooth reduces, rolling speed is accelerated, thereby improved production efficiency, increased output about 40%; Save electricity by about 50%; The workpiece that utilizes this Mould Machining to go out, the place, low footpath of the tooth of its screw thread be a circular arc type also, make between the tooth of workpiece and the tooth anti-twist power and stretching resistance enhancing, the service life of having improved workpiece.

Description of drawings

Fig. 1 is existing roll die cutaway view

Fig. 2 is existing roll die tooth cutaway view

Fig. 3 is the utility model stereo appearance figure

Fig. 4 is the utility model cutaway view

Fig. 5 is the utility model tooth cutaway view

Among the figure: 1 roll extrusion die body, 2 axis holes, 3 screw threads

4 trapezoidal shape teeth, 5 arc shape teeth

The specific embodiment

Shown in Figure 5 as Fig. 3 Fig. 4, described acme thread roll die is made up of two identical roll extrusion die bodys 1, roll extrusion die body 1 is cylindrical, roll extrusion die body 1 axially have an axis hole 2, the side of roll extrusion die body 1 is a screw thread 3, it is characterized in that: the section of screw thread 3 is an arc shape tooth 5.

Described arc shape tooth 5, its arc refer at the bottom of the isosceles arc trapezoidal, and these two trapezoidal waists are straight line, and upper base is the circular arc line (see figure 4).

The angle of the side of described two adjacent arc shape teeth 5 is 30 degree when metric system standard, and promptly the tooth form angle is 30 degree; At made in U.S.A＜Ai Kemu〉during standard 29 degree, promptly the tooth form angle is 29 degree.

During use, workpiece clamp is between two moulds, and the rotation of mould will be pushed workpiece, make it moulding.

Claims

1. acme thread roll die is characterized in that: described acme thread roll die, form by two identical roll extrusion die bodys, the roll extrusion die body is cylindrical, the roll extrusion die body axially have an axis hole, the side of roll extrusion die body is a screw thread, it is characterized in that: the section of screw thread is the arc shape tooth.

2. acme thread roll die according to claim 1 is characterized in that: described arc shape tooth, its arc refer at the bottom of the isosceles arc trapezoidal, and these two trapezoidal waists are straight line, and upper base is a circular arc line.

3. acme thread roll die according to claim 1 is characterized in that: the angle of the side of described two adjacent arc shape teeth is 30 degree when metric system standard, and promptly the tooth form angle is 30 degree; At made in U.S.A＜Ai Kemu〉during standard 29 degree, promptly the tooth form angle is 29 degree.