Anti-slip tooth design applicable to high-hardness metal sectional material stretching and straightening

A technology of metal profiles and anti-slip teeth, which is applied in the design of anti-slip teeth on the jaws of stretching machines, and in the field of anti-slip teeth design, can solve problems such as too deep bite, inability to bite in, and broken ends, etc., to achieve moderate bite depth and avoid stress concentrated effect

Inactive Publication Date: 2015-04-29
GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Figure 1(a) and Figure 1(b) shows the commonly used anti-skid teeth, where, Figure 1(a) For densely arranged convex nails, Figure 1(b) They are straight teeth with a triangular section with a tooth height greater than 5mm. They can meet the tensile requirements of most profiles, but for profiles with high hardness and poor plasticity, this type of tooth shape is not suitable, either cannot bite in, or bite too much If it is too deep, it will cause broken ends, or because the teeth are too dense, the surface of the chuck will be scraped off in a large area, so it is necessary to design new anti-skid teeth in a targeted manner

Method used

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  • Anti-slip tooth design applicable to high-hardness metal sectional material stretching and straightening
  • Anti-slip tooth design applicable to high-hardness metal sectional material stretching and straightening
  • Anti-slip tooth design applicable to high-hardness metal sectional material stretching and straightening

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Experimental program
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Effect test

Embodiment 1

[0019] When stretching and straightening ultra-high-strength rare earth magnesium alloy extruded sheets, the convex nail type anti-skid teeth ( Figure 1(a) ) cannot avoid slipping, while the usual triangular-section straight teeth ( Figure 1(b) ) would cause broken ends, so the anti-skid teeth were redesigned. The size of the plate to be straightened is 300mm×25mm×10000mm. The parameters of the designed tooth shape are as follows: tooth height h=2mm, front bottom angle θ 1 = Rear base angle θ 2 =20°, the platform width between teeth w=5mm, the tooth profile is as follows image 3 shown. After the anti-skid teeth are processed, the surface layer of the jaw where the anti-skid teeth are located is quenched to improve its hardness and wear resistance. At the same time, remove the metal debris between the anti-slip teeth in time to avoid excessive accumulation of debris that will paste the anti-slip teeth and cause slippage.

[0020] practice shows that, image 3 The anti-...

Embodiment 2

[0022] When stretching and straightening the high-strength rare-earth magnesium alloy rectangular cross-section square bar with a specification of 210mm×95mm×14000mm, the usual anti-skid teeth cannot effectively avoid slipping and broken ends, so the anti-skid teeth were redesigned. The parameters of the designed tooth shape are as follows: tooth height h=5mm, front bottom angle θ 1 =30°, back bottom angle θ 2 =100°, the platform width between teeth w=0, the tooth profile is as follows Figure 4 shown. After the anti-skid teeth are processed, the surface layer of the jaw where the anti-skid teeth are located is quenched to improve its hardness and wear resistance. At the same time, remove the metal debris between the anti-slip teeth in time to avoid excessive accumulation of debris that will paste the anti-slip teeth and cause slippage.

[0023] After practice, Figure 4 The anti-skid teeth shown are effective in preventing slipping and end breaks.

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Abstract

The invention relates to an anti-slip tooth design applicable to high-hardness metal sectional material stretching and straightening. Anti-slip teeth arranged at a tong jaw of a stretching machine are straight teeth with isosceles-triangle-shaped cross sections, the extending direction of the teeth is vertical to the stretching direction, the height of the teeth is 2 to 5mm, the front bottom angle and the back bottom angle of the anti-slip teeth are 10 degrees to 80 degrees, and the width of a platform among the teeth is 0 to 50mm; or the anti-slip teeth of the tong jaw of the stretching machine are barb-shaped teeth, the extending direction of the teeth is vertical to the stretching direction, the height of the teeth is 2 to 5mm, the front bottom angle of the anti-slip teeth is 10 degrees to 80 degrees, the back bottom angle of the anti-slip teeth is 90 degrees to 170 degrees, and the width of the platform among the teeth is 0 to 50mm. When the anti-slip teeth designed by a method provided by the invention is adopted, the slippage between sectional materials and the tong jaw can be effectively avoided, so that the stretching can be smoothly carried out, and in the use process for high-hardness metal sectional material stretching and straightening, the biting depth of the teeth is proper, so that the fracture due to stress concentration is avoided, in addition, a proper gap is formed among the teeth, and the clamp head skin can be prevented from being easily peeled off.

Description

technical field [0001] The invention relates to a design of anti-slip teeth suitable for stretching and straightening of high-hard metal profiles, in particular to the design of anti-slip teeth of jaws of a stretching machine, and belongs to the field of stretching and straightening of metal profiles. Background technique [0002] The metal profiles manufactured by the pressure processing method often have distortions in shape, and the stretching method is usually used to straighten them in actual production. At the same time, for profiles with internal residual stress, pre-stretching can effectively eliminate residual stress, thereby avoiding deformation of the profile during subsequent machining. [0003] Preventing slipping between the jaws of the stretching machine and the profile is a prerequisite for stretching. The stretching machine has two clamping ends. When stretching, one clamping end is fixed, and the other clamping end is loaded with tension. Each clamping en...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21D22/22
CPCB21D3/12
Inventor 石国梁张奎李兴刚李永军马鸣龙袁家伟
Owner GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG
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