Manufacture method for superfine hard alloy blind hole bars

A cemented carbide rod and cemented carbide technology, which is applied in the field of preparation of ultra-fine cemented carbide rods with blind holes, can solve problems such as waste of materials, low yield, thermal cracks, etc., to improve production efficiency and product quality, Improve the precision of size control and the effect of uniform and dense tissue

Active Publication Date: 2014-07-23
武汉新锐合金工具有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

However, in recent years, with the increasing drilling efficiency, drilling depth and drilling quality, straight hole internal cooling drills gradually cannot meet the performance requirements of high-efficiency hole processing for drills.
In order to meet the drilling requirements of deep holes and special holes and improve the efficiency of chip removal, various types of side hole internal cooling tools have been designed. The traditional production method of this tool is to use the solid ultra-fine carbide rod with EDM The processing method is to drill a certain depth of internal cooling blind hole first, and then make the tool by opening the inner hole on the side according to the need. Since the blind h

Method used

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  • Manufacture method for superfine hard alloy blind hole bars
  • Manufacture method for superfine hard alloy blind hole bars

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preparation example Construction

[0020] The preparation method of superfine cemented carbide blind hole bar, such as figure 1 As shown, the soft billet 1 of the straight-hole ultra-fine cemented carbide rod is prepared by vacuum piston extrusion or vacuum screw extrusion, and the shrinkage coefficient of the straight-hole ultra-fine cemented carbide rod soft billet 1 is 20~ 40%, the solid bar soft billet 2 is prepared by extrusion or molding. By adjusting the content of forming agent in the superfine mixture or the pressing pressure, the shrinkage coefficient of the solid bar soft billet is 2-11% smaller than that of the straight hole bar, and the solid bar soft billet 2 is put into the straight hole bar soft billet up to a given length. The billet 1 is fixed in a hole at one end, placed in a low-pressure sintering furnace and sintered at 1340-1420°C for 36-60 hours. During high-temperature sintering, the alloy is densified by argon pressure. The sintering pressure is 1-10 MPa, so that the solid short rod So...

Embodiment

[0024] Firstly, the vacuum piston extrusion or screw vacuum extrusion method is used to form a straight-hole ultra-fine carbide round rod soft billet with a specified size. The ultra-fine cemented carbide WC grain size is 0.2-0.8 μm, and the Co content is 6-14. %, VC content is 0~0.8%, Cr 3 C 2 The content is 0.3-1.2%, and the shrinkage coefficient of the soft billet is controlled at 20-40%. At the same time, the mixture of the same formula is used to prepare the diameter The solid bar soft billet is 1-10% smaller than the diameter of the inner hole, and the shrinkage coefficient of the soft billet is 2-11% smaller than that of the straight hole ultra-fine carbide rod soft billet. Put the solid bar soft billet into the straight hole up to the specified length The soft billet of the bar is fixed in a hole at one end, placed in a low-pressure sintering furnace, and sintered at a temperature of 1340-1420 ° C for 36-60 hours. During high-temperature sintering, the alloy is densif...

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Abstract

The invention relates to a manufacture method for superfine hard alloy blind hole bars. Soft straight-hole superfine hard alloy bar billets are manufactured in an extruding forming mode, soft solid bar billets are manufactured in an extruding or mould pressing mode, the diameter of each soft solid bar billet is smaller than that of a straight hole of each soft straight-hole superfine hard alloy bar billet, the shrinkage coefficient of each soft solid bar billet is smaller than that of each soft straight-hole superfine hard alloy bar billet, the soft solid bar billets are cut off according to the fixed length, then put into the hole at one end of each soft straight-hole bar billet to be fixed, placed into a low-pressure sintering furnace to be sintered, the holes of the soft straight-hole bar billets are larger than the shrinkage coefficient of each soft solid bar billet in during sintering, prestress produced in the sintering process enable the soft straight-hole bar billets and the soft solid bar billets to be densified through metallurgical bonding, and the superfine hard alloy blind hole bars different in diameter and depth are manufactured. The manufactured superfine hard alloy blind hole bars are used for manufacturing automobiles and aviation machinery and non-standard and efficient hard alloy overall inner-cooling drill bits for machining other mechanical device parts.

Description

technical field [0001] The invention relates to a method for preparing an ultrafine cemented carbide blind hole rod. The ultrafine cemented carbide blind hole rod prepared by the method can be used to manufacture non-standard, High-efficiency solid carbide drills. Background technique [0002] Drilling is the most common process on modern automatic processing lines or machining centers. The drill bit is a common tool for drilling. During use, due to the large force it bears, it is prone to heat and wear, especially at the top of the tool tip. [0003] In order to prolong the service life of the drill bit, a series of methods are used, the most common is the external cooling process. However, under this process, due to the continuous discharge of debris during processing, it is difficult for the coolant to reach the top, and the ideal cooling effect cannot be achieved. As the processing depth and difficulty increase, the effect envisaged by this cooling process becomes mor...

Claims

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Application Information

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IPC IPC(8): B22F3/16B22F3/20B22F7/06B22F5/10C22C29/08
Inventor 徐纯芳武发绩邹宇星李友军黄庆明
Owner 武汉新锐合金工具有限公司
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