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Heat treatment method of connecting rod bolt

A heat treatment method and bolt technology, applied in heat treatment furnaces, heat treatment equipment, furnace types, etc., can solve problems such as cracks, achieve reliable connection, improve strength and rigidity, and improve service life

Inactive Publication Date: 2017-12-08
LIUZHOU JINTE NEW WEAR RESISTANT MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a heat treatment method for connecting rod bolts, so as to solve the problem that cracks are easily formed in the existing processing methods of connecting rod bolts

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] A heat treatment method for connecting rod bolts, comprising the following steps:

[0015] A. First, the bar is formed by die forging to form the connecting rod bolt forging blank. The initial forging temperature is 1100°C and the final forging temperature is 800°C; then the connecting rod bolt forging blank is normalized, and the connecting rod bolt forging blank is bulk packed In the furnace, the temperature is 870°C±10°C, keep warm for 10 minutes and then take it out and air-cool to room temperature;

[0016] B. Extruding the connecting rod bolt forging blank through a thread extrusion knife to obtain a connecting rod bolt, the connecting rod bolt has a rod portion and a threaded portion connected to the rod portion;

[0017] C. (1) Heat the threaded portion of the connecting rod bolt to 400°C-450°C and keep it warm for 10 hours; heat the threaded portion to 1000°C-1100°C within 20 minutes, keep it warm for 10 minutes, and then quench it with quenching oil ;Heat the...

Embodiment 2

[0022] A heat treatment method for connecting rod bolts, comprising the following steps:

[0023] A. First, the bar is formed by die forging to form the connecting rod bolt forging blank. The initial forging temperature is 1100°C and the final forging temperature is 800°C; then the connecting rod bolt forging blank is normalized, and the connecting rod bolt forging blank is bulk packed In the furnace, the temperature is 870°C±10°C, keep warm for 10 minutes and then take it out and air-cool to room temperature;

[0024] B. Extruding the connecting rod bolt forging blank through a thread extrusion knife to obtain a connecting rod bolt, the connecting rod bolt has a rod portion and a threaded portion connected to the rod portion;

[0025] C. (1) Heat the threaded portion of the connecting rod bolt to 400°C-450°C and keep it warm for 12 hours; heat the threaded portion to 1000°C-1100°C within 30 minutes, keep it warm for 10 minutes, and then quench it with quenching oil ;Heat the...

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PUM

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Abstract

The invention discloses a heat treatment method for connecting rod bolts, which comprises the following steps: A. forming a connecting rod bolt forging blank through die forging; B. extruding the connecting rod bolt forging blank through a thread extrusion knife to obtain a continuous Rod bolts; C. Quenching the threaded portion of the connecting rod bolts, and then quenching the rod portion of the connecting rod bolts; carburizing the quenched connecting rod bolts; D. Alkaline washing and degreasing of the heat-treated connecting rod bolts , pickling, and after drying, immerse the connecting rod bolts in the surface phosphating treatment solution; E. After blackening the connecting rod bolts, the heat treatment of the connecting rod bolts is completed. Compared with the prior art, the invention can solve the delayed fracture and fatigue fracture of the high-strength lower connecting rod bolts, the connection is reliable in use, not easy to break, and the service life of the connecting rod bolts is improved.

Description

technical field [0001] The invention relates to the technical field of bolt manufacturing, in particular to a heat treatment method for connecting rod bolts used for fastening connecting rods. Background technique [0002] The key part of the connecting rod bolt fastening connecting rod is the fastener that connects the split connecting rod cover and the big end of the connecting rod. Its quality directly affects the safety of the connecting rod work; usually the connecting rod bolts are made of high-quality Turning of alloy steel or high-quality carbon steel after quenching and tempering heat treatment; the strength and rigidity of turning-forming connecting rod bolts are difficult to guarantee, and the rods are prone to breakage, and the connecting rod bolts are prone to rust and corrosion when they are in a relatively humid environment , resulting in the easy formation of an accident source that produces cracks. Contents of the invention [0003] The technical problem ...

Claims

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Application Information

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IPC IPC(8): C23F17/00C21D9/00C21D1/18C21D1/28
CPCC23F17/00C21D1/18C21D1/28C21D9/0093
Inventor 何兴保何圣贤柯湘
Owner LIUZHOU JINTE NEW WEAR RESISTANT MATERIAL CO LTD
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