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Preparation method of titanium alloy bar for pedicle screw

A pedicle screw and titanium alloy technology, which is applied in the field of preparation of titanium alloy rods for pedicle screws, can solve the problems of stress imbalance and shrinkage of the U-shaped notch of pedicle screws, and achieve a simple preparation method , suitable for mass production and processing

Active Publication Date: 2014-09-24
西安赛特思迈钛业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a method for preparing titanium alloy rods for pedicle screws, which solves the problem of excessive internal stress of the titanium alloy rods prepared in the prior art, which causes the stress imbalance of the U-shaped notch of the pedicle screws to cause shrinkage The problem

Method used

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  • Preparation method of titanium alloy bar for pedicle screw
  • Preparation method of titanium alloy bar for pedicle screw
  • Preparation method of titanium alloy bar for pedicle screw

Examples

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preparation example Construction

[0021] A kind of preparation method of titanium alloy bar material for pedicle screw of the present invention, such as figure 1 As shown, it specifically includes the following steps:

[0022] Step 1: Use a linear drawing machine to carry out rough straightening of the titanium alloy strip billet at a temperature of 870 ° C to 920 ° C. The hole die of the drawing machine is The speed of the drawing machine is controlled at 5-6m / min to obtain the billet;

[0023] Step 2: Use a peeling machine to peel off the blank bar obtained in step 1. The running speed of the peeling machine is 2-3m / min, and the surface defects are removed. 3000~3050mm, to get the stripped bar;

[0024] Step 3: Use a vertical electric heating straightening machine to straighten the peeled bar obtained in step 2. The pressure is 0.005-0.3MPa, the straightening current is 1500-1670A, and the current is heated for 30-45s with an interval of 10-25s , and then heated for 20-35s to obtain straightened rods;

...

Embodiment 1

[0035] Step 1: Use a linear drawing machine to carry out rough straightening of the titanium alloy strip billet at a temperature of 870 ° C. The hole die of the drawing machine is The speed of the drawing machine is controlled at 5m / min to obtain the billet;

[0036] Step 2: Use a peeling machine to peel off the blank bar obtained in step 1. The running speed of the peeling machine is 2m / min to remove the surface defects. 3050mm, get the bar after skinning;

[0037] Step 3: Use a vertical electric heating straightening machine to straighten the peeled bar obtained in step 2. The pressure is 0.005MPa, the straightening current is 1650A, and the electric current is used to heat for 37s, with an interval of 20s, and then heated for 27s to obtain straightening After the bar;

[0038] Step 4: Use a centerless grinder to grind the straightened bar obtained in step 3 for 5 passes. The grinding amount of the first 4 passes is 0.05 mm / pass, and the grinding amount of the 5th pass is...

Embodiment 2

[0040] Step 1: Use a linear drawing machine to carry out rough straightening of the titanium alloy strip billet at a temperature of 890 ° C. The hole die of the drawing machine is The speed of the drawing machine is controlled at 5.5m / min to obtain the billet;

[0041] Step 2: Use a peeling machine to peel off the blank bar obtained in step 1. The running speed of the peeling machine is 2.5m / min to remove the surface defects. ~3500mm, to get the stripped bar;

[0042] Step 3: Use a vertical electric heating straightening machine to straighten the peeled bar obtained in step 2. The pressure is 0.15MPa, the straightening current is 1500A, and the current is heated for 30s with an interval of 10s, and then heated for 35s to obtain straightening After the bar;

[0043] Step 4: Use a centerless grinder to grind the straightened bar obtained in Step 3 for 4 passes, with a grinding amount of 0.05mm and a total machining allowance of 0.2mm, and conduct 100% by ultrasonic flaw detec...

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Abstract

The invention discloses a preparation method of a titanium alloy bar for a pedicle screw. The preparation method comprises the following steps: firstly, performing rounding coarse straightening treatment on original rolled bar blanks by adopting a straight drawbench, then removing surface defects by using a flaying machine, simultaneously performing sizing determining operation at a discharge hole, straightening in a vertical electrothermal straightening mode, and finally, performing centerless grinding treatment to obtain a finished bar. According to the preparation method of the titanium alloy bar for the pedicle screw, the rounding coarse straightening treatment is performed on the rolled bar blanks by adopting the straight drawbench, and a traditional two-roll or multi-roll straightening rounding mode is replaced, so as to prevent residual stress due to coarse straightening; the residual stress generated by traditional two-roll or multi-roll fine straightening is removed by utilizing the vertical straightening mode, and the problem of necking caused by unbalanced stress of a U-shaped groove of the pedicle screw due to excessive inner stress of the titanium alloy bar prepared in the prior art is solved; the preparation method has the advantage of simplicity and is suitable for mass production and machining.

Description

technical field [0001] The invention belongs to the technical field of processing titanium alloy rods, and in particular relates to a preparation method of titanium alloy rods for pedicle screws. Background technique [0002] At present, the material used for spinal pedicle screws at home and abroad is mainly titanium alloy (Ti 6 Al 4 V) Rod preparation, the specification is between Φ13mm~Φ15mm. Due to its unique structural design and the needs of the spinal surgery process, the screw product adopts the U-shaped groove opening method in the bar processing process, and the titanium alloy rod prepared by the prior art has too much internal stress, and the U-shaped groove opening is used. This method will destroy the stress balance of the rod, making the opening appear in a contracted state after trimming, which will damage the precision of the pedicle screw product and bring more troubles in clinical operations. Contents of the invention [0003] The purpose of the presen...

Claims

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Application Information

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IPC IPC(8): B21C37/04B21D3/12B21D3/00
Inventor 李雷王海魏芬绒邵晖樊亚军罗乾伟石金虎李雪萍陈志宏曹继敏
Owner 西安赛特思迈钛业有限公司
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