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Method for improving stability of contracting sizes of TC4 medical U-shaped nails

A dimensional stability, TC4 technology, applied to nails, furnace types, pins, etc., can solve the problems of difficult control of surface quality and dimensional accuracy, large difference in residual stress, scratches on the surface of bars, etc., to reduce irreversible damage. The effect of destructive loss, stable necking size, and easy temperature adjustment

Active Publication Date: 2017-06-13
DALIAN SUNNY TITANIUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the amount of drawing deformation is large, the breakage of the drawing die will be accelerated, and the surface of the drawn bar is prone to scratches, strains, etc., and the surface quality and dimensional accuracy are not easy to control, and the subsequent cold straightening (Achieved by hyperbolic straightening) The resulting residual stress varies greatly, which also leads to poor consistency in the shrinkage size of the manufactured U-shaped nails, and even fluctuations of 0.08mm to 0.20mm
Therefore, the method of improving the degree of recrystallization of the bar by increasing the amount of drawing deformation has great limitations.

Method used

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  • Method for improving stability of contracting sizes of TC4 medical U-shaped nails
  • Method for improving stability of contracting sizes of TC4 medical U-shaped nails

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] The specific scheme of the heat treatment method for improving the dimensional stability of the shrinkage of TC4 medical staples in the present invention is provided in detail by the following examples.

[0047] The test material is a medical TC4 bar with a length of φ14mm and a length of 3m (for the production of medical U-shaped nails). After hot rolling, scaling, hot drawing and electric straightening, the bar is treated according to the following scheme.

[0048] First, keep the TC4 bar in a high-temperature car bench-type resistance furnace at 710°C for 1.5h, and then air-cool it out of the furnace. Cut a 6mm section to observe the microstructure of the longitudinal section, as shown in Fig. figure 1 shown.

[0049] Then, after hyperbolic straightening of the high-temperature heat-treated bar, it was kept in a low-temperature car bench-type resistance furnace at 620°C for 1.5 hours, and then air-cooled after it was released from the furnace. A 6mm section was cut t...

Embodiment 2

[0052] First, keep the TC4 bar in a high-temperature car bench-type resistance furnace at 710°C for 1.5h, and then air-cool it out of the furnace. Cut a 6mm section to observe the microstructure of the longitudinal section, as shown in Fig. figure 1 shown.

[0053] Then, after hyperbolic straightening of the high-temperature heat-treated bar, it was kept in a low-temperature car bench-type resistance furnace at 640°C for 1.5 hours, and then air-cooled after it was released from the furnace. A 6mm section was cut to observe the microstructure of the longitudinal section. The results are as follows Figure 6 shown. Use the HVS1000Z Vickers hardness tester to test the Vickers hardness of the longitudinal section. The loading load is 9.8N, the dwell time is 15s, and the hardness of 15 points is measured along the central axis of the sample from the center to the edge. The results are as follows Figure 7 shown.

[0054] Finally, after the low-temperature heat-treated bar is grou...

Embodiment 3

[0056] First, keep the TC4 bar in a high-temperature car bench-type resistance furnace at 750°C for 1.5h, and then air-cool it out of the furnace. Cut a 6mm section to observe the microstructure of the longitudinal section, as shown in Fig. Figure 10 shown.

[0057] Then, after hyperbolic straightening of the high-temperature heat-treated bar, it was kept in a low-temperature car bench-type resistance furnace at 620°C for 1.5 hours, and then air-cooled after it was released from the furnace. A 6mm section was cut to observe the microstructure of the longitudinal section. The results are as follows Figure 11 shown. Use the HVS1000Z Vickers hardness tester to test the Vickers hardness of the longitudinal section. The loading load is 9.8N, the dwell time is 15s, and the hardness of 15 points is measured along the central axis of the sample from the center to the edge. The results are as follows Figure 12 shown.

[0058] Finally, after the low-temperature heat-treated bar is ...

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Abstract

The invention discloses a method for improving the stability of the contracting sizes of TC4 medical U-shaped nails. The method for improving the stability of the contracting sizes of the TC4 medical U-shaped nails comprises the following steps of high-temperature heat treatment, hyperbolic curve straightening, low-temperature heat treatment, and detection of the contracting sizes of the U-shaped nails. According to the method for improving the stability of the contracting sizes of the TC4 medical U-shaped nails, a rod which is provided with an equiaxed structured and sufficient in re-crystallization is obtained through adjustment of the high-temperature heat treatment temperature; then, a rod meeting the GB / T 13810-2007 requirements is obtained through adjustment of the low-temperature heat treatment temperature; and finally, the rods obtained after different heat treatment technologies are conducted are each machined into 15 U-shaped nails, and the contracting size of each U-shaped nail is detected. Because the high-temperature heat treatment technology and the low-temperature heat treatment technology of the TC4 rods are adjusted, and detection is additionally conducted in each step, the contracting size of each U-shaped nail is guaranteed to be smaller than 0.10 mm, and the contracting sizes are kept stable. When the method for improving the stability of the contracting sizes of the TC4 medical U-shaped nails, it is only needed to conduct high-temperature and low-temperature heat treatment on the TC4 rods within a certain temperature range, other technological parameters do not need to be adjusted, and temperature adjustment is convenient, reliable and easy to operate.

Description

technical field [0001] The invention relates to the production and processing technology of TC4 alloy rods for medical staples, in particular to a method for improving the dimensional stability of the shrinkage of TC4 medical staples. Background technique [0002] U-shaped nails (pedicle screws), lock nuts and connecting rods are used as a spinal fixation system to treat fractures and deformities of the spine. After the U-shaped nail is processed and formed, it will shrink (the U-shaped mouth shrinks). The size and stability of the shrinkage are one of the important indicators for evaluating the performance of the U-shaped nail. Medical TC4 rods are processed into U-shaped nails and implanted into the human body as a spinal fixation system. When the shrinkage of the U-shaped nails is greater than 0.10mm, it will cause the matching connecting rods and lock nuts to be unable to be accurately clamped and positioned, which brings great difficulties to clinical applications. Inc...

Claims

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Application Information

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IPC IPC(8): B21C37/04B21D3/00B21G3/00C21D9/00
CPCB21C37/04B21D3/00B21G3/00C21D9/0075
Inventor 陶晓杰闵小华白鹏飞赵杰程从前钟功诚白树玉徐春宝
Owner DALIAN SUNNY TITANIUM IND
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