CN215032398U

CN215032398U - Moving core head for stretching copper pipe

Info

Publication number: CN215032398U
Application number: CN202121198290.7U
Authority: CN
Inventors: 娄助军; 刘俊彪; 张杨俊; 张德志; 李玉林
Original assignee: Chongqing Longyu Precise Copper Tube Co ltd
Current assignee: Chongqing Longyu Precise Copper Tube Co ltd
Priority date: 2021-05-31
Filing date: 2021-05-31
Publication date: 2021-12-07
Anticipated expiration: 2031-05-31

Abstract

The utility model relates to a copper pipe draws technical field, specifically is a tensile copper pipe is with core that moves about, including the core body, the core body includes big footpath section, path section and changeover portion, and changeover portion smooth connection is between big footpath section and path section, and the shape of the cross section of core body is the same with the shape of the cross section of product, and the compression zone angle of core body is 10 ~ 60. This scheme avoids its drunkenness around with the help of the structural feature of core print body self, need not to utilize the core bar can make the core print body fix in core hole department to can realize drawing in succession, improve the efficiency of drawing of tubular product.

Description

Moving core head for stretching copper pipe

Technical Field

The utility model relates to a copper pipe draws technical field, specifically is a tensile copper pipe is with core head that moves about.

Background

At present, special-shaped copper pipes such as double lugs and a cross are additionally arranged in a gas water heater to replace a common cylindrical copper pipe, so that the heat exchange efficiency is improved, and the water outlet time of hot water is shortened. The special-shaped copper pipes such as the double lugs and the cross are generally formed by drawing cylindrical copper pipe blanks.

The special-shaped copper pipe drawing die generally comprises an outer die and a core print, wherein in the prior art, the core print generally adopts a fixed core print, a core rod is inserted into the core print, the core print is fixed at a core hole of the outer die through the core rod, a copper pipe blank is sleeved outside the core print and is connected with a stretcher after penetrating through the core hole. During drawing, the shape of the copper pipe is determined by the core hole and the core head together, the outer diameter of the copper pipe is determined by the outer die, the inner diameter of the copper pipe is determined by the core head, and the wall thickness of the copper pipe is determined by the gap between the core head and the core hole, so that the drawing and shaping of the copper pipe are realized.

However, the core head is fixed by the core rod in the drawing mode, the length of the core rod is fixed, the core rod is limited by the length of the core rod, the copper pipe can be drawn only by one section, the copper pipe can not be drawn continuously by one single copper pipe, and the production efficiency is low.

SUMMERY OF THE UTILITY MODEL

The utility model provides a tensile copper pipe is with core head that moves about to solve the current problem that mode efficiency is not high of drawing the copper pipe.

In order to achieve the above object, the utility model provides a following technical scheme:

the utility model provides a tensile copper pipe is with core head that moves about, includes the core head body, and the core head body includes big footpath section, path section and changeover portion, and changeover portion smooth connection is between big footpath section and path section, and the shape of the cross section of core head body is the same with the shape of the cross section of product, and the compression district angle of core head body is 10 ~ 60.

The principle and the beneficial effect of the scheme are as follows:

when in drawing, the core print body is placed at the core hole of the outer die, the small diameter section faces the drawing direction, and a gap is formed between the core print body and the core hole for the pipe to pass through; and connecting the pipe blank with a stretcher after the pipe blank passes through the core hole, so that the core head body is sleeved in the pipe blank. During drawing, the small-diameter section and the core hole are matched to determine the formed shape of the pipe, the core hole determines the outer diameter of the pipe, the core print body determines the inner diameter of the pipe, and the gap between the core print body and the core hole determines the wall thickness of the pipe, so that drawing is realized. When the core print body tends to move towards the drawing direction, the diameter of the formed pipe is smaller due to the existence of the large-diameter section and the transition section, so that the transition section and the large-diameter section can be clamped at the formed pipe and cannot move forwards continuously; and due to the effect of forward pushing of the drawing force on the core print body, the core print body cannot move backwards towards the large-diameter section, so that the core print body can move around at the core hole, and the drawing of the pipe is realized. In the scheme, the core print body is prevented from moving back and forth by virtue of the structural characteristic of the core print body, and the core print body can be fixed at the core hole without utilizing the core rod, so that continuous drawing can be realized, and the drawing efficiency of the pipe is improved.

Further, the compression zone angle of the core print body is 22 °.

Has the advantages that: so set up the stability that prevents the core print body that can be better towards drawing the direction drunkenness, further improve the core print body.

Further, the cross section of the core print body is cross-shaped, and the length of the cross-shaped horizontal part is smaller than that of the vertical part.

Has the advantages that: the cross-shaped core print body is used for forming a cross-shaped pipe.

Further, the length of the transverse straight part of the cross section of the small-diameter section is 10-12 mm, and the length of the vertical part of the cross section of the small-diameter section is 25-27 mm.

Has the advantages that: the required pipe can be formed more accurately by the arrangement.

Further, the length of the transverse straight part of the cross section of the small-diameter section is 11mm, and the length of the vertical part of the cross section of the small-diameter section is 26 mm.

Further, the length of the transverse straight part of the cross section of the large-diameter section is 13-15 mm, and the length of the vertical part of the cross section of the large-diameter section is 28-30 mm.

Further, the length of the transverse straight part of the cross section of the large-diameter section is 14mm, and the length of the vertical part of the cross section of the large-diameter section is 29 mm.

Further, the length of the core print body is 29-31 mm, the length of the transition section is 5-7 mm, and the length of the small diameter section is 11-13 mm.

Has the advantages that: so set up the stability that prevents core head body drunkenness that can be better, further improve the core head body.

Further, the length of the core print body is 30mm, the length of the transition section is 6.17mm, and the length of the small-diameter section is 12 mm.

Drawings

Fig. 1 is an end view of the present invention;

FIG. 2 is a left side view of FIG. 1;

FIG. 3 is a top view of FIG. 1;

fig. 4 is an end view of the middle and outer molds of the present invention;

fig. 5 is a cross-sectional view taken along line D-D of fig. 4.

Detailed Description

The following is further detailed by way of specific embodiments:

reference numerals in the drawings of the specification include: the die comprises a vertical part 1, a transverse straight part 2, a large-diameter section 3, a transition section 4, a small-diameter section 5, a die sleeve 6, a core hole 7, a die core 8 and a through hole 9.

Example (b):

as shown in fig. 2, the traveling core print for the drawn copper pipe comprises a core print body, wherein the core print body comprises a large-diameter section 3, a small-diameter section 5 and a transition section 4, and the transition section 4 is smoothly connected between the large-diameter section 3 and the small-diameter section 5. In this embodiment, the length of the core print body is 30mm, the length of the transition section 4 is 6.17mm, and the length of the small diameter section 5 is 12 mm. The compression zone angle of the core print body is 22 deg., where the compression zone angle is shown as angle a in fig. 2.

As can be seen from fig. 1, the cross section of the core print body is cross-shaped, the length of the cross-shaped horizontal straight portion 2 is smaller than that of the vertical portion 1, specifically, in this embodiment, the length of the horizontal straight portion 2 (the horizontal straight portion 2 in fig. 1) of the cross section of the small-diameter section 5 is 11mm, and the length of the vertical portion 1 of the cross section of the small-diameter section 5 is 26 mm; the length of the transverse straight portion 2 of the cross section of the large diameter section 3 (length C in fig. 3) is 14mm, and the length of the vertical portion 1 of the cross section of the large diameter section 3 (length B in fig. 2) is 29 mm.

The specific implementation process is as follows:

the outer die shown in fig. 4 and 5 is adopted, the outer die comprises a die sleeve 6 and a die core 8, a through hole 9 axially penetrates through the die sleeve 6, the die core 8 is embedded in the through hole 9, a conical core hole 7 is formed in the die core 8, and the shape of the core hole 7 is the same as that of the core head body. When drawing, the core print body is placed at the core hole 7 of the outer die, the small diameter section 5 of the core print body faces the drawing machine, and the pipe passes through the gap between the core print body and the inner wall of the core hole 7. The pipe is sleeved outside the core head body and then penetrates out of the core hole 7 from left to right, and then is connected with a stretcher. The drawing machine is started to draw the pipe, the core head body is positioned inside the pipe, the pipe is drawn and formed into a cross shape when passing through a gap between the core hole 7 and the core head body, the outer diameter of the pipe is determined by the core hole 7, the inner diameter of the pipe is determined by the small-diameter section 5, and the pipe with the cross section being the cross shape is drawn. The stretcher used for copper tube drawing in the prior art is adopted in the stretcher in this embodiment, and details are not described in this embodiment.

During drawing, when the core print body is subjected to the drawing force of the drawing machine and tends to move forwards (towards the direction of the drawing machine), the core print body cannot move forwards (towards the direction of the drawing machine) in the pipe because the transition section 4 and the large-diameter section 3 exist, the pipe at the small-diameter section 5 is already formed, and the pipe at the small-diameter section 5 is smaller in diameter; and the core print body is drawn forward by the stretcher again, so the core print body can not move backwards in the pipe, and the core print body can move around at the core hole 7 without fixing the core print body by using the core rod and being limited by the core rod, thereby realizing the continuous drawing of the copper pipe.

In the embodiment, the moving core print body is adopted to realize the drawing of the pipe, the core print body moves at the core hole 7 by utilizing the structure of the core print body, the core print body is not required to be fixed at the core hole 7 by adopting the core rod, the limitation of the length of the core rod is avoided, the continuous drawing of the pipe can be realized, and the drawing efficiency of the pipe is greatly improved.

The above description is only an example of the present invention, and the common general knowledge of the known specific structures and characteristics of the embodiments is not described herein. It should be noted that, for those skilled in the art, without departing from the structure of the present invention, several modifications and improvements can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicability of the patent. The scope of the claims of the present application shall be determined by the contents of the claims, and the description of the embodiments and the like in the specification shall be used to explain the contents of the claims.

Claims

1. The utility model provides a tensile copper pipe is with core head that moves about which characterized in that: including the core head body, the core head body includes big footpath section, path section and changeover portion, and changeover portion smooth connection is between big footpath section and path section, and the shape of the cross section of core head body is the same with the shape of the cross section of product, and the compression zone angle of core head body is 10 ~ 60.

2. The traveling core print for drawing copper tubes as claimed in claim 1, wherein: the compressed zone angle of the core print body was 22 °.

3. The traveling core print for drawing copper tubes as claimed in claim 1, wherein: the cross section of the core print body is in a cross shape, and the length of a transverse straight part of the cross shape is smaller than that of a vertical part.

4. The traveling core print for drawing copper tubes as claimed in claim 3, wherein: the length of the transverse straight part of the cross section of the small-diameter section is 10-12 mm, and the length of the vertical part of the cross section of the small-diameter section is 25-27 mm.

5. The traveling core print for drawing copper tubes as claimed in claim 4, wherein: the length of the transverse straight part of the cross section of the small-diameter section is 11mm, and the length of the vertical part of the cross section of the small-diameter section is 26 mm.

6. The traveling core print for drawing copper tubes as claimed in claim 3, wherein: the length of the transverse straight part of the cross section of the large-diameter section is 13-15 mm, and the length of the vertical part of the cross section of the large-diameter section is 28-30 mm.

7. The traveling core print for drawing copper tubes as claimed in claim 6, wherein: the length of the transverse straight part of the cross section of the large-diameter section is 14mm, and the length of the vertical part of the cross section of the large-diameter section is 29 mm.

8. The traveling core print for drawing copper tubes as claimed in claim 1, wherein: the length of core head body is 29 ~ 31mm, and the length of changeover portion is 5 ~ 7mm, and the length of minor diameter section is 11 ~ 13 mm.

9. The traveling core print for drawing copper tubes as recited in claim 8, wherein: the length of core head body is 30mm, and the length of changeover portion is 6.17mm, and the length of footpath section is 12 mm.