CN210098752U

CN210098752U - Necking die

Info

Publication number: CN210098752U
Application number: CN201920554854.2U
Authority: CN
Inventors: 杨立福; 钱兵保; 冯付韬; 万观新; 方洪; 胡窕窕; 谭振兴; 余秀英
Original assignee: HANGZHOU SHENSHI ENERGY CONSERVATION TECHNOLOGY Co Ltd
Current assignee: HANGZHOU SHENSHI ENERGY CONSERVATION TECHNOLOGY Co Ltd
Priority date: 2019-04-22
Filing date: 2019-04-22
Publication date: 2020-02-21
Anticipated expiration: 2029-04-22

Abstract

The utility model relates to a tubular product spinning throat technical field, concretely relates to throat mould. The die comprises a die body, wherein a die hole is formed in the die body; the die bore includes a fixed diameter portion and a reduced diameter portion, the reduced diameter portion having a larger diameter end and a smaller diameter end; the fixed diameter part is communicated with the reduced diameter part and is coaxially arranged, and the fixed diameter part is matched with one end with a smaller diameter of the reduced diameter part; the reducing portion is provided with at least one protrusion. By arranging at least one bulge on the reducing part, when the optical pipe sections and the liner pipe at the two ends of the inner pipe are reduced, a groove with the depth corresponding to the bulge is formed on the surface of the optical pipe section, so that the liner pipe and the reduced openings of the optical pipe sections at the two ends of the processed inner pipe cannot be loosened, and the inner pipe and the liner pipe are fixed.

Description

Necking die

Technical Field

The utility model relates to a tubular product spinning throat technical field, concretely relates to throat mould.

Background

The coaxial sleeve heat exchanger for making condenser and evaporator in refrigeration industry is made up by using thin-wall tube as working material, and is formed from concentric inner tube and outer sleeve, and the cold and hot fluids can be respectively flowed in the ring gaps of inner tube and outer sleeve, at the same time can transfer heat. The inner pipe structure is characterized in that the middle section is a threaded pipe section, the two ends are light pipe sections, and the light pipe sections at the two ends of the inner pipe are usually subjected to necking processing.

However, with the development of environmental protection innovation of the refrigerant, the used pressure is higher and higher, so that a section of liner tube is added to the inner tube in the double-tube heat exchanger in the light tube section, and then the liner tube and the processed light tube section of the inner tube are subjected to spinning and necking processing together, so that the interference fit of the liner tube and the processed light tube section of the inner tube is ensured, and the pressure bearing capacity of the straight line section (light tube section) of the inner tube. However, in actual conditions, due to the limitation of market equipment and a mold structure, a clearance fit phenomenon exists after the pipe sections at the two ends of the liner pipe and the processed inner pipe are contracted, when the heat exchanger casing is installed on a whole machine to operate, the loose liner pipe per se can wear through the inner pipe under the impact of water flow, so that the water side and the refrigerant side are connected in series, the whole machine set is scrapped, and the material consumption and the energy consumption are huge.

SUMMERY OF THE UTILITY MODEL

Therefore, the to-be-solved technical problem of the utility model lies in overcoming the light pipe section throat at the inner tube both ends after the bushing pipe among the prior art and the processing and having not hard up defect to a throat mould is provided.

In order to solve the technical problem, the utility model discloses a technical scheme as follows:

the utility model provides a necking die, include:

a die body having a die hole therein;

the die bore includes a fixed diameter portion and a reduced diameter portion, the reduced diameter portion having a larger diameter end and a smaller diameter end; the fixed diameter part is communicated with the reduced diameter part and is coaxially arranged, and the fixed diameter part is matched with one end with a smaller diameter of the reduced diameter part;

the reducing portion is provided with at least one protrusion.

In the necking die, the necking part is provided with at least one necking section.

In the necking die, the two necking sections are respectively a first necking section and a second necking section, the first necking section is positioned at one end with a larger diameter, and the diameter of any position of the first necking part is not smaller than the maximum diameter of the second necking section; at least one of the protrusions is arranged on the first reducing section.

Preferably, the first reducing section is a cylindrical section.

In the necking die, the die body is formed by assembling a plurality of die matrixes.

In the necking die, a bulge is arranged at the corresponding necking part on at least one die base body.

Preferably, the protrusion is a rectangular convex groove. Further, the height of the rectangular convex groove is selected to be 0.8mm-1 mm.

In the necking die, the die hole further comprises a guide part, the guide part is communicated with the necking part and is coaxially arranged, and the guide part is matched with the end with the larger diameter of the necking part.

Preferably, the guide portion has a circular truncated cone shape.

The utility model discloses technical scheme has following advantage:

1. the necking die provided by the utility model comprises a die body, wherein a die hole is arranged in the die body; the die bore includes a fixed diameter portion and a reduced diameter portion, the reduced diameter portion having a larger diameter end and a smaller diameter end; the fixed diameter part is communicated with the reduced diameter part and is coaxially arranged, and the fixed diameter part is matched with one end with a smaller diameter of the reduced diameter part; the reducing portion is provided with at least one protrusion. By arranging at least one bulge on the reducing part, when the optical pipe sections and the liner pipe at the two ends of the inner pipe are reduced, a groove with the depth corresponding to the bulge is formed on the surface of the optical pipe section, so that the liner pipe and the reduced openings of the optical pipe sections at the two ends of the processed inner pipe cannot be loosened, and the inner pipe and the liner pipe are fixed.

2. The utility model provides a reducing section has two in the throat mould, and it is first reducing section and second reducing section respectively, first reducing section is located the great one end of diameter, just the diameter of the arbitrary department of first reducing portion is not less than the maximum diameter of second reducing section. The first reducing section, the second reducing section and the sizing part form a three-section type die hole, wherein the first reducing section can accommodate a joint part of the light pipe section and the inner pipe thread section during reducing processing to perform transition at the reducing part and prevent the joint part from being damaged; the second reducing section is a reducing forming section; the fixed diameter part forms the final size of the reducing part, and the reducing part can be connected with an upstream pipeline and a downstream pipeline. At least one bulge is arranged on the first reducing section, which is equivalent to the fixation of the inner pipe and the liner pipe at the initial end, and when the spinning reducing processing is carried out, because the inner diameter of the first reducing section is larger than that of the second reducing section, the inner pipe can form a stable annular concave fixing groove on the outer wall of the inner pipe, and the inner pipe is not damaged.

3. The utility model provides a mould hole still includes guide portion, guide portion with undergauge portion intercommunication and coaxial setting, guide portion with the great one end phase-match of undergauge portion diameter. The guiding part can guide the inner pipe to smoothly carry out the spinning necking of the die hole, and can accommodate partial thread section of the inner pipe without damaging the thread section of the inner pipe in the spinning necking construction process.

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 embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a perspective view of a necking die provided by the present invention;

FIG. 2 is a schematic view of the mold base structure provided by the present invention;

FIG. 3 is a schematic view of a necking die assembled by die bases according to the present invention;

description of reference numerals:

1: a mold body; 2: a diameter reducing portion; 2-1: a first reducing section; 2-2: a second reducing section; 2-3: a protrusion; 3: a fixed diameter part; 4: a guide portion.

Detailed Description

The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Furthermore, the technical features mentioned in the different embodiments of the invention described below can be combined with each other as long as they do not conflict with each other.

Example 1

As shown in fig. 1 to 3, the present embodiment provides a necking die, which includes,

the die comprises a die body 1, wherein a die hole is formed in the die body 1; the die hole comprises a fixed diameter part 3 and a reduced diameter part 2, wherein the reduced diameter part 2 is provided with one end with a larger diameter and one end with a smaller diameter;

the reducing part 2 is provided with a first reducing section 2-1 and a second reducing section 2-2, the first reducing section 2-1 is positioned at one end with a larger diameter, and the diameter of any position of the first reducing part 2-1 is not smaller than the maximum diameter of the second reducing section 2-2; at least one bulge 2-3 is arranged on the first reducing section 2-1;

the fixed diameter part 3 is communicated with the reduced diameter part 2 and is coaxially arranged, and the fixed diameter part 3 is matched with one end of the reduced diameter part 2 with a smaller diameter.

According to the necking die provided by the embodiment, the at least one bulge 2-3 is arranged on the necking part 2, so that a groove with the depth corresponding to the bulge 2-3 is formed on the surface of the smooth pipe section when the smooth pipe sections and the lining pipe at the two ends of the inner pipe are subjected to necking, the lining pipe and the necking of the light pipe sections at the two ends of the processed inner pipe are ensured not to be loosened, and the inner pipe and the lining pipe are fixed; the first reducing section 2-1, the second reducing section 2-2 and the sizing part form a three-section type die hole, wherein the diameter of any position of the first reducing section 2-1 is not smaller than the maximum diameter of the second reducing section 2-2, so that the combined part of the light pipe section and the inner pipe thread section can be accommodated during reducing processing, the transition of the reducing part is carried out, and the combined part is prevented from being damaged; the second reducing section 2-2 is a reducing forming section; the fixed diameter part forms the final size of the reducing part, and the reducing part can be connected with an upstream pipeline and a downstream pipeline. Further, at least one protrusion 2-3 is provided on the first reducing section 2-1, which is equivalent to ensure the fixing of the inner pipe and the liner pipe at the initial end, and when the spinning reducing process is performed, because the inner diameter of the first reducing section 2-1 is larger than that of the second reducing section 2-2, it can form a stable ring-like concave fixing groove on the outer wall of the inner pipe to fix the liner pipe therein without damaging the inner pipe.

As an alternative, the reduced diameter portion 2 may have only one reduced diameter section, which also performs the function of fixing the inner pipe and the liner pipe; alternatively, the reduced diameter portion 2 may have three or more reduced diameter sections, which may be set according to the material of the inner pipe and the requirement of reducing diameter.

Preferably, the first reducing section 2-1 is a cylindrical section which can accommodate a threaded section of the inner pipe; furthermore, the length of the cylindrical section can be selected to be 15mm, and the outer diameter of the cylindrical section is 1-2mm smaller than the outer diameter of the fine thread of the thread section, so that the thread section of the inner pipe is prevented from being damaged. At this time, the protrusions 2-3 may be disposed at the middle position of the cylindrical section, i.e., at 7.5mm, to form a stable ring-like concave fixing groove on the outer wall of the inner tube.

As an alternative embodiment, the protrusions 2 to 3 can be selected as rectangular convex grooves, and further, the protrusions can be selected as rectangular convex grooves, the length of the convex grooves is 5mm, and the height of the convex grooves is 0.8mm to 1 mm; the bulges 2-3 can also be selected to be bulge structures with other shapes, and when the spinning necking processing is carried out, stable annular-like concave fixing grooves can be formed on the outer wall of the inner pipe to fix the liner pipe inside the inner pipe without damaging the inner pipe.

In the necking die, the die hole further comprises a guide part 4, the guide part 4 is communicated with the necking part 2 and is coaxially arranged, and the guide part 4 is matched with the larger end of the necking part 2.

The guiding part can guide the inner pipe to smoothly carry out the spinning necking of the die hole, and can accommodate partial thread section of the inner pipe without damaging the thread section of the inner pipe in the spinning necking construction process.

Preferably, the guide portion 4 has a circular truncated cone shape, and can substantially match the shape of both ends of the inner tube, thereby achieving a better guiding effect.

Example 2

As shown in fig. 2-3, the die body 1 is assembled by four die bases, which can be machined from Cr12 material and the surface of which is heat treated to reach surface hardness range HRC 55-62. The die body 1 is assembled by four die bases, and is selected by comprehensively considering the accuracy and the easy forming degree of the die, or is assembled by other die bases.

Furthermore, the bulges 2-3 are arranged on one of the die bodies, when the spinning necking processing is carried out, because the bulges are arranged on one die body, the spinning resistance can be reduced, and a stable annular concave fixing groove can be easily formed on the outer wall of the inner pipe so as to fix the liner pipe inside the inner pipe. Of course, the projections 2-3 can also be provided on a plurality of mould bodies therein, which also enables the fixing of the inner liner.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications can be made without departing from the scope of the invention.

Claims

1. A necking die, comprising:

the die comprises a die body (1), wherein a die hole is formed in the die body (1);

the die hole comprises a fixed diameter part (3) and a reduced diameter part (2), wherein the reduced diameter part (2) is provided with one end with a larger diameter and one end with a smaller diameter; the fixed diameter part (3) is communicated with the reduced diameter part (2) and is coaxially arranged, and the fixed diameter part (3) is matched with one end of the reduced diameter part (2) with a smaller diameter;

the reducing part (2) is provided with at least one bulge (2-3).

2. A necking die according to claim 1, wherein the reduced diameter portion (2) has at least one reduced diameter section.

3. The necking die of claim 2, wherein the two reducing sections are a first reducing section (2-1) and a second reducing section (2-2), the first reducing section (2-1) is positioned at the end with the larger diameter, and the diameter of any position of the first reducing section (2-1) is not smaller than the maximum diameter of the second reducing section (2-2); at least one protrusion (2-3) is arranged on the first reducing section (2-1).

4. A necking die according to claim 3, wherein the first reducing section (2-1) is a cylindrical section.

5. A necking die according to any one of claims 1 to 4, wherein the die body (1) is assembled from a plurality of die bases.

6. A necking die according to claim 5, wherein at least one die base body is provided with a protrusion at the corresponding reduced diameter portion (2).

7. A necking die according to claim 6, wherein the protrusions (2-3) are rectangular grooves.

8. A necking die of claim 7, wherein the rectangular tongue height is 0.8mm to 1 mm.

9. A necking die according to claim 1, wherein the die hole further comprises a guiding portion (4), the guiding portion (4) communicating with the reduced diameter portion (2) and being coaxially arranged, the guiding portion matching the end of the reduced diameter portion having the larger diameter.

10. A necking die according to claim 9, wherein the guide (4) is frustoconical.