Production process for drawing copper pipe

A production process, copper tube technology, applied in wire drawing dies, mandrels, etc., can solve problems such as low production efficiency, and achieve the effects of improving quality, reducing friction, and reducing resistance

Pending Publication Date: 2021-08-24
CHONGQING LONGYU PRECISION COPPER TUBE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention intends to provide a production process for drawing copper

Method used

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  • Production process for drawing copper pipe
  • Production process for drawing copper pipe
  • Production process for drawing copper pipe

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] A production process for drawing copper pipes, which uses a drawing die as shown in the figure for drawing, and the drawing die includes an outer die and a moving core 10 . Such as figure 1 and figure 2 As shown, the outer mold includes a mold casing 1 and a mold core 6, the mold casing 1 has a through hole in the axial direction, and the mold core 6 is embedded in the through hole. A tapered core hole 2 is opened axially on the mold core 6 , and the right end of the core hole 2 is connected with a shaping hole 9 and a connecting hole 8 in sequence. Taper of core hole 2 ( figure 2 The C angle) is 15-70°, specifically, the taper of the core hole 2 in this embodiment is 26°. The cross-section of the core hole 2 is cross-shaped, and the length of the cross-shaped horizontal part is shorter than the length of the vertical part. Specifically, the length of the vertical part at the small diameter end of the core hole 2 is 27-29mm, which is 28mm in this embodiment. The co...

Embodiment 2

[0060] The difference between this embodiment and the first embodiment lies in that the structure of the oiling mechanism is different. Specifically, such as Figure 6 As shown, the oiling mechanism includes a sleeve 15, and the sleeve 15 is axially penetrated with a channel 14 for the copper pipe to pass through. The right end of the sleeve 15 can be installed on the left end of the outer mold by bolts. After installation, the channel 14 is connected to the outer mold. Via connected.

[0061] On the channel 14 inwalls, an oiling sleeve 22 is installed in rotation, combined with Figure 7 It can be seen that the oil-coated sleeve 22 includes a mesh-like skeleton 23, and the skeleton 23 is filled with an oil-absorbing layer 24. In this embodiment, the oil-absorbing layer 24 adopts oil-absorbing cotton, and the inner wall of the oil-coated sleeve 22 is glued and fixed with an oil-coated layer 25. The oil-coated layer 25 adopts soft and oil-absorbing materials such as sponge an...

Embodiment 3

[0068] Such as Figure 8 As shown, the difference between the present embodiment and the second embodiment is that there is an annular piston chamber 28 inside the sleeve 15, the piston chamber 28 is located on the left side of the oil storage chamber 16, and the piston chamber 28 and the sleeve 15 are arranged concentrically. An annular piston 27 is slidably installed in the piston chamber 28, and the piston 27 is connected with a cylinder. The left end of the piston cavity 28 is uniformly connected with several blowing pipes 26 , and the blowing pipes 26 are obliquely aligned with the entrance of the channel 14 . The right end of the piston chamber 28 is uniformly connected with some air suction pipes 30, the air suction pipe 30 is installed on the inside of the piston chamber 28, the free end of the air suction pipe 30 faces the passage 14, and the air suction pipe 30 is equipped with a unidirectional air inlet towards the piston chamber 28. one-way valve. The outside of ...

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Abstract

The invention relates to the technical field of copper pipe drawing, in particular to a production process for drawing a copper pipe. The production process comprises the following steps of A, mounting a core head; B, straightening a copper coil pipe through a straightening mechanism; C, conducting performing; D, conducting one-time drawing forming; and E, conducting cutting, specifically, a pipe obtained after drawing forming is cut, and a finished product is obtained. A drawing die comprises an outer die and a moving core head, the outer die comprises a die sleeve and a die core, the die sleeve is axially provided with a through hole, the die core is embedded in the through hole, the die core is provided with a conical core hole, the core hole is communicated with the through hole, the cross section of the core hole is in a cross shape, and the core hole is used for being matched with the moving core head; and the moving core head comprises a large-diameter section, a small-diameter section and a transition section, the transition section is smoothly connected between the large-diameter section and the small-diameter section, and the shape of the cross section of the moving core head is the same as that of the cross section of the core hole. The production process can solve the problem that an existing drawing manner is low in production efficiency.

Description

technical field [0001] The invention relates to the technical field of copper tube drawing, in particular to a production process for drawing copper tubes. Background technique [0002] At present, gas water heaters are equipped with double-eared, cross-shaped and other special-shaped copper tubes to replace ordinary cylindrical copper tubes to improve heat exchange efficiency and speed up the time for hot water to flow out. Special-shaped copper tubes such as double-eared and cross-shaped copper tubes are generally drawn from cylindrical copper tube blanks. [0003] The special-shaped copper tube drawing die generally includes an outer mold and a core head. In the prior art, the core head generally adopts a fixed core head, inserts a core rod into the core head, and fixes the core head to the core hole of the outer mold through the core rod. The copper tube blank is sleeved outside the core head, passed through the core hole and connected with the stretching machine. When...

Claims

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Application Information

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IPC IPC(8): B21C3/02B21C3/16B21C9/00B21C37/06
CPCB21C3/02B21C3/16B21C9/00B21C37/06
Inventor 刘俊彪娄助军张旭辉张德志李玉林
Owner CHONGQING LONGYU PRECISION COPPER TUBE CO LTD
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