CN210586786U

CN210586786U - Pipe reducing die for improving precision of ultra-long pipe reducing

Info

Publication number: CN210586786U
Application number: CN201921283952.3U
Authority: CN
Inventors: 徐羽一
Original assignee: Jiangyin Hongye Mechanical Co ltd
Current assignee: Jiangyin Hongye Mechanical Co ltd
Priority date: 2019-08-09
Filing date: 2019-08-09
Publication date: 2020-05-22
Anticipated expiration: 2029-08-09

Abstract

The utility model relates to a draw technical field, it discloses a draw mould for improving overlength draw precision, including draw mould body, be provided with the die cavity that is used for the draw on the draw mould body, just draw mould body includes three or three above edge the piecemeal die body of the mutual butt joint of axial of die cavity, the mutual coaxial alignment of die cavity of adjacent piecemeal die body. The utility model provides the high mould precision of overlength degree draw has ensured the quality of overlength degree draw.

Description

Pipe reducing die for improving precision of ultra-long pipe reducing

Technical Field

The utility model relates to a draw technical field, concretely relates to draw mould for improving overlength draw precision.

Background

Pipe shrinking is a forming process for reducing the diameter of the end of a pipe. Typically the pipe reduction is carried out on a special pipe reduction machine fitted with a pipe reduction die (as shown in figure 3). When the pipe is contracted, the pipe is extruded into a contraction cavity of a pipe contraction mold under the action of axial force, a radially contracted contraction opening is generated in a deformation area of the cavity and is plastically deformed, and then the pipe enters a stable area of the cavity to finally form a reduced end diameter.

In order to meet the requirements of pipe reducing operation, the cavity surface of the pipe reducing die must have a high hardness, which is usually required to be heat treated to a hardness of HRC60 or more. Since the processing is extremely difficult and very uneconomical, the high-hardness pipe-reducing die is not generally machined after heat treatment, but is directly put into use.

The pipe contracting mould in the prior art has the following problems when in super-long pipe contracting:

1. if the pipe reducing mold shown in fig. 3 is adopted, because the length of the mold is shorter than that of the pipe reducing mold, the front end of the pipe exceeds the mold cavity, the pipe at the front end is in a free state, the pipe is out of control and bent, and the straightness of the pipe body after pipe reducing is out of tolerance. In addition, some ultra-long reducing pipes need to have special reducing shapes, and the reducing pipe mould cannot be shortened by the special ultra-long reducing pipe.

2. If the mould is lengthened to be equal to or more than the length of the pipe reducing, the mould is subjected to larger bending deformation after heat treatment due to the longer length of the pipe reducing mould, and the straightness error of the mould cavity is caused to exceed the design requirement, so that the straightness of the pipe body after pipe reducing is out of tolerance.

SUMMERY OF THE UTILITY MODEL

In order to solve the problem, the utility model provides a draw mould for improving overlength draw precision aims at improving the mould precision of overlength draw, ensures the quality of overlength draw. The specific technical scheme is as follows:

the utility model provides a draw mould for improving overlength draw precision, includes draw the pipe mould body, be provided with the die cavity that is used for the draw on the draw pipe mould body, just draw the pipe mould body to include three or three above follow the piecemeal mould body of the mutual butt joint of axial of die cavity, the mutual coaxial alignment of die cavity of adjacent piecemeal mould body.

Preferably, the blocking die body is provided with an outer cylinder which is coaxial with the axis of the die cavity, and the outer cylinders of the blocking die bodies have the same diameter.

Because the split die bodies which are axially butted with each other are adopted, the length of each split die body is short, the heat treatment deformation is small, the coaxiality error of the die cavity of each split die body and the outer cylinder is small, and the integral straightness error of the die cavity is effectively controlled after the outer cylinder is used as the reference for butting.

Through practical tests, the pipe reducing precision of the pipe reducing mould with the partitioned mould body structure can be controlled within +/-0.1 mm of straightness.

The utility model discloses a draw mould for improving overlength draw precision still includes the overcoat and is in installation positioning flange dish on the outer cylinder of piecemeal die body.

Preferably, the blocking die body is a vacuum quenching blocking die body.

Preferably, the surface of the die cavity of the vacuum quenching split die body is provided with a quenching layer with the hardness of HRC60 or above.

Preferably, the surface of the quenching layer is the surface of the quenching layer which is not processed.

Preferably, the ratio of the axial length dimension of the pipe reducing mold body to the minimum inner diameter dimension of the mold cavity of the pipe reducing mold body is greater than 4.

Preferably, the ratio of the axial length dimension of the block mold body to the minimum inner diameter dimension of the mold cavity of the block mold body is less than 1.

The optimal design of the axial length dimension of the blocking die body and the size of the die cavity further improves the precision and the working reliability of the pipe reducing die.

The utility model has the advantages that:

first, the utility model discloses a draw mould for improving overlength draw precision is owing to adopted the piecemeal die body of the mutual butt joint of axial for the length of each piecemeal die body is short, the thermal treatment warp for a short time, and its die cavity of each piecemeal die body is all less with the axiality error of outer cylinder like this, utilizes outer cylinder to carry out the whole straightness accuracy error of its die cavity after the butt joint as the benchmark just obtained effectual control.

Second, the utility model discloses a draw mould for improving overlength draw precision adopts the draw mould of piecemeal die body structure, and its draw precision can be controlled within 0.1 mm's straightness accuracy.

Third, the utility model discloses a draw mould for improving overlength draw precision, the optimal design of piecemeal die body axial length size and die cavity size has further improved the precision and the operational reliability of draw mould.

Drawings

Fig. 1 is a schematic structural view of a pipe shrinking mold for improving the precision of ultra-long pipe shrinking according to the present invention;

FIG. 2 is a schematic view of the connection between the pipe-contracting mold body and the mounting flange of FIG. 1;

FIG. 3 is a prior art pipe contracting mold body.

In the figure: 1. the pipe reducing die comprises a pipe reducing die body, 2, a die cavity, 3, a blocking die body, 4, an outer cylinder, 5, a mounting and positioning flange plate, 6 and a pipe.

Detailed Description

The following description will further describe embodiments of the present invention with reference to the accompanying drawings and examples. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.

Fig. 1 to 3 show that the utility model discloses an embodiment of a draw mould for improving overlength draw precision, including draw mould body 1, be provided with the die cavity 2 that is used for the draw on the draw mould body 1, just draw mould body 1 to include three or three above edge the piecemeal die body 3 of the mutual butt joint of axial of die cavity, the mutual coaxial alignment of die cavity of adjacent piecemeal die body 3.

Preferably, the block die body 3 is provided with an outer cylinder 4 coaxial with the axis of the die cavity 2, and the outer cylinders 4 on the block die bodies 3 have the same diameter.

Due to the adoption of the split die bodies 3 which are axially butted with each other, the length of each split die body 3 is short, the heat treatment deformation is small, so that the coaxiality error of the die cavity 2 and the outer cylinder 4 of each split die body 3 is small, and the integral straightness error of the die cavity is effectively controlled after the outer cylinder 4 is used as a reference for butting.

Through practical tests, the pipe reducing precision of the pipe reducing mould with the structure of the block mould body 3 can be controlled within +/-0.1 mm of straightness.

The pipe reducing die for improving the precision of the ultra-long pipe reducing further comprises a mounting and positioning flange 5 sleeved on the outer cylinder 4 of the block die body 3.

Preferably, the block die body 3 is a vacuum quenching block die body.

Preferably, the ratio of the axial length dimension of the pipe reducing mold body 1 to the minimum inner diameter dimension of the mold cavity 2 of the pipe reducing mold body 1 is greater than 4.

The optimal design of the axial length dimension of the blocking die body 3 and the dimension of the die cavity 2 further improves the precision and the working reliability of the pipe reducing die.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the technical principle of the present invention, and these improvements and decorations should also be regarded as the protection scope of the present invention.

Claims

1. The utility model provides a draw mould for improving overlength draw precision, its characterized in that, includes the draw die body, be provided with the die cavity that is used for the draw on the draw die body, just the draw die body includes three or three above edge the mutual piecemeal die body that docks of axial of die cavity, the mutual coaxial alignment of die cavity of adjacent piecemeal die body.

2. A tube reducing die for improving accuracy of an ultra-long tube reducing according to claim 1, wherein an outer cylinder coaxial with an axis of the die cavity is provided on the split die bodies, and a diameter of the outer cylinder on each split die body is the same.

3. A tube reducing die for improving accuracy of an ultra-long tube reducing die according to claim 1, further comprising a mounting and positioning flange sleeved on an outer cylinder of the partitioned die body.

4. A tube reducing die for improving accuracy of an ultra-long tube reducing according to claim 1, wherein the partitioning die body is a vacuum quenching partitioning die body.

5. A pipe reducing die for improving accuracy of an ultra-long pipe reducing as claimed in claim 4, wherein a surface of the die cavity of said vacuum quenching split die body has a quenching layer with hardness of HRC60 or more.

6. A tube reducing die for improving accuracy of an ultra-long tube reducing according to claim 5, wherein the surface of the quenching layer is a non-processed quenching layer surface.

7. A pipe reducing die for improving accuracy of an ultra-long pipe reducing according to claim 1, wherein a ratio of an axial length dimension of said pipe reducing die body to a minimum inner diameter dimension of a die cavity of said pipe reducing die body is larger than 4.

8. A tube reducing die for improving accuracy of an ultra-long length of tube reducing as claimed in claim 1, wherein the ratio of the axial length dimension of said segmented die body to the minimum internal diameter dimension of the die cavity of said segmented die body is less than 1.