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Screw being locally heat treated and quenched

一种局部淬火、螺钉的技术，应用在热处理炉、热处理设备、螺钉等方向，能够解决螺钉变形、头部突然破碎、螺钉头断裂等问题

Inactive Publication Date: 2007-03-07
ILLINOIS TOOL WORKS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this quenching may cause the screw head and upper half to become so brittle that (1) the screw head breaks due to screw displacement when excessive torque is applied; (2) hydrogen embrittlement (if the screw is plated) And (3) the head is suddenly broken, which is caused by the thermal expansion and contraction of the base material tightened by the screw, which cannot be relieved by the elongation of the screw.
Furthermore, localized heating of the head during partial quenching has the potential to cause deformation of the screw when the entire screw (with a changing temperature profile) is exposed to the quenching fluid

Method used

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  • Screw being locally heat treated and quenched
  • Screw being locally heat treated and quenched
  • Screw being locally heat treated and quenched

Examples

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Embodiment Construction

[0020] Referring to FIG. 1, a carbon steel screw 10 of the present invention has a head 12, a shank portion 14 below the head, and a screw point 16 at one end of the shank portion opposite the head. A plurality of threads or threads 18 having cusps 20 and interdental grooves 22 wrap around the screw portion 14 and screw tip 16 .

[0021] Referring to FIGS. 1-3 , the head 12 has a top surface 24 , a bottom 26 , a central region 28 and an outer rim 30 . The central area 28 includes an in-line recess 32 suitable for receiving a standard screwdriver or similar driving tool or suitable for receiving a Phillips TM A pair of intersecting grooves 32 and 34 of a screwdriver or similar driving tool designed for cross-shaped grooves.

[0022] Each groove is defined by a pair of opposed generally upstanding walls 36 and 38 which intersect top surface 24 at edges 40 and 42 and groove bottom 44 at intersection lines 41 and 43 . The groove depth is the distance between the edges 40 and 42 ...

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Abstract

A carbon steel screw has one or more portions which have been selectively hardened by selective heat treatment and quenching. In one preferably embodiment, an upper portion of the screw head is selectively hardened to prevent or reduce damage when torque is applied using a driving tool. In another embodiment, The screw tip may be selectively hardened for more effective penetration into a substrate. Preferably, the selectively heated portions are selectively quenched to reduce or avoid distortion.

Description

[0001] This case is a divisional application of the Chinese invention patent application with the filing date of January 12, 2000 and the application number of 00100158.2. technical field [0002] This invention relates to carbon steel screws and similar fasteners which are partially hardened to provide desired properties and behavior, and methods of making such partially hardened screws. Background technique [0003] Stainless steel screws with partially quenched portions are disclosed in US Patent No. 3,376,780 to Tanczyn. The stainless steel screw disclosed by Tanczyn has partially hardened threads and a partially hardened head adapted to be inserted into a screwdriver. These areas are harder than the rest of the screw. The stainless steel screw contains no more than 0.20wt% (weight percent, the same below) of carbon, 10-25wt% of chromium, 5-20wt% of nickel, 1-5wt% of copper and 0.25-2.5wt% of aluminum. Quenching is accomplished by cold working the stainless steel at ap...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D9/00F16B25/00F16B19/00F16B35/00
CPCC21D2211/008C21D9/0093C21D2221/01F16B19/00
Inventor 马克·D·拜尔威廉姆·A·斯普林迈克·斯塔罗兹希特斯基S·雷斯·尤尔哈森
Owner ILLINOIS TOOL WORKS INC
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