Necking die

A mold and mold hole technology, which is applied in the field of shrinking molds, can solve the problems of clearance fit, wear through the inner tube, and scrapping of the unit.

Pending Publication Date: 2020-10-27
HANGZHOU SHENSHI ENERGY CONSERVATION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the limitations of market equipment and mold structure, there will be a clearance fit between the liner and the smooth pipe section at both ends of the processed inner pipe, which will cause the heat exchanger sleeve to loosen when it is installed on the complete machine. Under the impact of water flow, the liner will wear through the inner tube, causing the water side and the refrigerant side to be connected together, causing the entire unit to be scrapped, and the consumables and energy consumption are huge

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0032] Such as Figure 1-3 As shown, the present embodiment provides a necking die, which includes,

[0033] The mold body 1 has a mold hole in the mold body 1; the mold hole includes a sizing portion 3 and a diameter-reducing portion 2, and the diameter-reducing portion 2 has an end with a larger diameter and an end with a smaller diameter;

[0034] The diameter reducing part 2 has a first diameter reducing section 2-1 and a second diameter reducing section 2-2, the first diameter reducing section 2-1 is located at the end with a larger diameter, and the first diameter reducing section The diameter of any part of the diameter portion 2-1 is not smaller than the maximum diameter of the second diameter-reducing section 2-2; at least one of the protrusions 2-3 is provided on the first diameter-reducing section 2-1;

[0035] The sizing portion 3 communicates with the diameter-reducing portion 2 and is arranged coaxially, and the sizing portion 3 matches the end of the diameter-r...

Embodiment 2

[0044] Such as Figure 2-3 As shown, the mold body 1 is assembled from four mold bases, which can be processed from Cr12 material, and the surface is heat-treated until the surface hardness reaches HRC55-62. The mold body 1 is assembled from four mold bases, which is selected in consideration of mold accuracy and ease of forming. It can also be assembled from several other mold bases.

[0045] Further, the protrusions 2-3 are arranged on one of the mold bodies. When processing the spinning and compression opening, since the protrusions are provided on one of the mold bodies, it can reduce the spinning resistance, and the inner tube can The outer wall easily forms a stable quasi-annular concave fixing groove to fix its inner liner. Of course, the protrusions 2-3 can also be arranged on a plurality of mold bodies, which can also realize the fixing of the inner liner.

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Abstract

The invention relates to the technical field of pipe spinning necking, in particular to a necking die. The necking die comprises a die body, and the die body is internally provided with a die hole; the die hole comprises a sizing part and a necking part; the necking part is provided with a large-diameter end and a small-diameter end; the sizing part and the necking part communicate and are coaxially arranged, and the sizing part is matched with the small-diameter end of the necking part; and the necking part is provided with at least one protrusion. By arranging the at least one protrusion onthe necking part, when smooth pipe sections located at the two ends of an inner pipe and a lining pipe are subjected to necking, concave grooves corresponding to the protrusions in depth are generatedon the surfaces of the smooth pipe sections, it is ensured that the lining pipe and necking parts of at the two ends of the inner pipe after machining are not loosened, and accordingly, the inner pipe and the lining pipe are fixed.

Description

technical field [0001] The invention relates to the technical field of pipe spinning and compression necking, in particular to a necking die. Background technique [0002] The coaxial casing heat exchanger used to make condensers and evaporators in the refrigeration industry is processed with thin-walled tubes. The coaxial casing heat exchanger is composed of a concentric inner tube and an outer tube, and the hot and cold fluids are respectively inside. Heat transfer while flowing in the annulus of the tube and outer casing. The structure of the above-mentioned inner pipe is that the middle section is a threaded pipe section, and the two ends are bare pipe sections, and the bare pipe sections at both ends of the inner pipe are usually subjected to necking processing. [0003] However, with the development of environmental protection and innovation of refrigerants, the pressure used is getting higher and higher. Therefore, the inner tube in the tube heat exchanger will add a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21D41/04B21D37/10
CPCB21D37/10B21D41/04
Inventor 杨立福钱兵保冯付韬万观新方洪胡窕窕谭振兴余秀英
Owner HANGZHOU SHENSHI ENERGY CONSERVATION TECH
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