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High-strength fastening bolt production technology

A technology for fastening bolts and production process, applied in the field of production technology of high-strength fastening bolts, can solve the problems of delayed fracture, difficult to guarantee strength, fatigue fracture, etc., and achieve the effect of preventing corrosion and maintaining the shape and strength of bolts

Inactive Publication Date: 2018-12-14
森冈精机(南通)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] High-strength bolts are commonly used fasteners in the machinery industry. The current processing method is generally formed by turning, and its strength is often difficult to guarantee. The transition or thread root is easy to cause delayed fracture and fatigue fracture. Therefore, it is necessary to study and improve the production process of traditional high-strength bolts, so as to efficiently carry out mass production under the premise of ensuring its quality, and meet the social demand for steel structures. Extensive demand for high-strength large hexagon head bolts

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] S1. Steel material selection: 35CrMo is selected as the blank. 35CrMo alloy structural steel has high static strength, impact toughness and high fatigue limit. It is suitable for making high-strength fastening bolts, and the blanks are cut according to the specifications of the bolts;

[0039] S2. Spheroidizing annealing: Carry out isothermal spheroidizing annealing in a bell furnace. The annealing temperature is 785°C, the holding time is 8 hours, and the hardness is controlled between HB100-120. Anneal before forging to obtain uniform and fine balls Pearlite, to better meet the actual production needs, if forging is carried out directly without annealing, it will be difficult to form, the mold is easily damaged, and the extruded parts are prone to cracks;

[0040] S3. Peeling and descaling: First, use mechanical descaling method to remove most of the iron oxide scale; then use chemical pickling agent to remove all oxide scales. Mechanical descaling method has high work...

Embodiment 2

[0051] S1. Steel material selection: 35CrMo is selected as the blank. 35CrMo alloy structural steel has high static strength, impact toughness and high fatigue limit. It is suitable for making high-strength fastening bolts, and the blanks are cut according to the specifications of the bolts;

[0052] S2. Spheroidizing annealing: Carry out isothermal spheroidizing annealing in a bell furnace. The annealing temperature is 800°C, the holding time is 10 hours, and the hardness is controlled between HB100-120. Anneal before forging to obtain uniform and fine balls Pearlite, to better meet the actual production needs, if forging is carried out directly without annealing, it will be difficult to form, the mold is easily damaged, and the extruded parts are prone to cracks;

[0053] S3. Peeling and descaling: First, use mechanical descaling method to remove most of the iron oxide scale; then use chemical pickling agent to remove all oxide scales. Mechanical descaling method has high wor...

Embodiment 3

[0064] S1. Steel material selection: 35CrMo is selected as the blank. 35CrMo alloy structural steel has high static strength, impact toughness and high fatigue limit. It is suitable for making high-strength fastening bolts, and the blanks are cut according to the specifications of the bolts;

[0065] S2. Spheroidizing annealing: Carry out isothermal spheroidizing annealing in a bell furnace, the annealing temperature is 815°C, the holding time is 12 hours, the hardness is controlled between HB100-120, annealing before forging, in order to obtain uniform and fine balls Pearlite, to better meet the actual production needs, if forging is carried out directly without annealing, it will be difficult to form, the mold is easily damaged, and the extruded parts are prone to cracks;

[0066] S3. Peeling and descaling: First, use mechanical descaling method to remove most of the iron oxide scale; then use chemical pickling agent to remove all oxide scales. Mechanical descaling method has...

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Abstract

The invention belongs to the technical field of bolt processing, and aims at providing a high-strength fastening bolt production technology. The high-strength fastening bolt production technology comprises the following steps of: step 1. selecting a steel product; step 2. carrying out spheroidizing annealing; step 3. shelling and descaling; step 4. drawing; step 5. carrying out cold forging and shaping; step 6. carrying out thread machining; step 7. carrying out heat treatment; step 8. detecting; step 9. tempering; step 10. carrying out secondary detection; and step 11. plating an anti-corrosion layer. Bolts screened out finally through material selection, annealing, descaling, drawing, cold forging, heat treatment, screening and tempering have the characteristic of high strength. The bolts have the characteristic of corrosion resistance by coating the surfaces of the bolts with Fe-Ni-Cr alloy coatings, and can be prevented from be corroded under harsh physicochemical conditions, and thus, the shape and strength of the bolts are maintained.

Description

technical field [0001] The invention relates to the field of bolt processing technology, more specifically, it relates to a production technology of high-strength fastening bolts. Background technique [0002] High-strength bolts are commonly used fasteners in the machinery industry. The current processing method is generally formed by turning, and its strength is often difficult to guarantee. The transition or thread root is easy to cause delayed fracture and fatigue fracture. Therefore, it is necessary to study and improve the production process of traditional high-strength bolts, so as to efficiently carry out mass production under the premise of ensuring its quality, and meet the social demand for steel structures. Extensive demand for high-strength large hexagon head bolts. Contents of the invention [0003] The object of the present invention is to provide a production process for high-strength fastening bolts, which has the function of producing high-strength bolts...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P15/00
CPCB23P15/00
Inventor 童嘉舜
Owner 森冈精机(南通)有限公司
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