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Hinge pin and machining method thereof

A processing method and technology of pin shafts, which are applied in the direction of shafts, shafts, bearings, mechanical equipment, etc., can solve the problems of large disassembly space and disassembly force, limited size, large structural size of pin shafts, etc., and achieve improved Corrosion resistance, effect of grain refinement

Active Publication Date: 2015-12-02
宁波瑞国精机工业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the pin shaft connection between structural components with high load / large size, the pin shaft has a large structural size and a large force, and the pin shaft is exposed outside, which is very easy to be scratched and touched by external force, so , the required disassembly space and disassembly force are large
And there are many disadvantages in the pin shaft in the prior art, as the direct pin or taper pin size is limited, be applicable to between the two parts that stress is not big; After one use, the accuracy is not easy to control, and the reuse rate is low; the materials of many pin shafts are made of ordinary steel, and the strength, wear resistance, and accuracy still need to be improved.

Method used

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  • Hinge pin and machining method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0039] Embodiment 1: A pin shaft is processed through the following steps:

[0040] Pre-treatment: pickling, derusting and air-drying the alloy steel used for the pin shaft with the following chemical composition, and then performing spheroidizing annealing treatment on the air-dried raw material at 770°C, phosphating treatment and Wire drawing; the chemical composition of the pin shaft steel is: C: 0.30%, Cr: 2.70%, Mo: 0.50%, B: 0.45%, Ti: 0.48%, Al: 0.12%, Si≤0.10%, S≤0.030 %, P≤0.030%, and the rest is Fe.

[0041] Forming: The above-mentioned processed raw materials are formed into the shape required by the pin shaft under the action of upsetting force, and then turned, milled, and thread-rolled to obtain a semi-finished pin shaft.

[0042] Heat treatment: keep the semi-finished pin shaft at 530°C for 50 minutes, raise the temperature to 880°C for 50 minutes, rapidly cool down to 530°C for 80 minutes, heat to 880°C for 60 minutes, and then cool naturally to room temperatu...

Embodiment 2

[0044] Embodiment 2: A pin shaft is processed through the following steps:

[0045] Pre-treatment: pickling, derusting and air-drying the alloy steel used for the pin shaft with the following chemical composition, and then performing spheroidizing annealing treatment on the air-dried raw material at 765°C, phosphating treatment and Wire drawing; the chemical composition of the pin steel is: C: 0.32%, Cr: 2.66%, Mo: 0.55%, B: 0.42%, Ti: 0.46%, Al: 0.10%, Si≤0.10%, S≤0.030 %, P≤0.030%, and the rest is Fe.

[0046] Forming: The above-mentioned processed raw materials are formed into the shape required by the pin shaft under the action of upsetting force, and then turned, milled, and thread-rolled to obtain a semi-finished pin shaft.

[0047] Heat treatment: keep the semi-finished pin shaft at 525°C for 60 minutes, raise the temperature to 870°C for 60 minutes, quickly cool down to 540°C and hold for 90 minutes, heat to 870°C for 50 minutes, and then cool naturally to room temper...

Embodiment 3

[0049] Embodiment 3: A pin shaft is processed through the following steps:

[0050] Pre-treatment: pickling, derusting and air-drying the alloy steel used for the pin shaft with the following chemical composition, and then performing spheroidizing annealing treatment on the air-dried raw material at 760°C, phosphating treatment and Wire drawing; the chemical composition of the pin shaft steel is: C: 0.25%, Cr: 2.80%, Mo: 0.40%, B: 0.55%, Ti: 0.45%, Al: 0.15%, Si≤0.10%, S≤0.030 %, P≤0.030%, and the rest is Fe.

[0051] Forming: The above-mentioned processed raw materials are formed into the shape required by the pin shaft under the action of upsetting force, and then turned, milled, and thread-rolled to obtain a semi-finished pin shaft.

[0052] Heat treatment: Heat the semi-finished pin shaft at 540°C for 40 minutes, raise the temperature to 900°C for 40 minutes, rapidly cool down to 550°C for 70 minutes, heat to 900°C for 40 minutes, and then cool naturally to room temperatu...

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Abstract

The invention relates to a hinge pin and a machining method thereof and belongs to the technical field of machining of hinge pins. The hinge pin is prepared from high-strength alloy steel. The alloy steel is composed of, by mass, 0.20%-0.50% of C, 2.50%-2.80% of Cr, 0.30%-0.80% of Mo, 0.30%-0.60% of B, 0.40%-0.60% of Ti, 0.02%-0.20% of Al, 0-0.10% of Si, 0-0.030% of S, 0-0.030% of P and the balance Fe. The reasonable-compatibility alloy steel for the hinge pin is subjected to spheroidizing annealing, phosphating and other treatment firstly, and then is machined to form a semi-finished hinge pin, and the hinge pin is obtained through the specific carburizing heat treatment and black dacromet treatment, so that the hinge pin meets the requirements of high-strength hinge pin steel in strength and hardness, for example, the hardness reaches 25 HRC, the surface hardness reaches 31 HRC, and the corrosion resistance of the hinge pin is further improved greatly.

Description

technical field [0001] The invention relates to a pin shaft and a processing method thereof, belonging to the technical field of pin shaft processing. Background technique [0002] The pin connection structure is the most commonly used force transmission structure in engineering. For example, in order to meet the needs of separate transportation, the boom and turntable, pole and turntable of large-tonnage crawler cranes are connected by pins. For the pin shaft connection between structural components with high load / large size, the pin shaft has a large structural size and a large force, and the pin shaft is exposed outside, which is very easy to be scratched and touched by external force, so , The required disassembly space and disassembly force are relatively large. And there are many disadvantages in the pin shaft in the prior art, as the direct pin or taper pin size is limited, be applicable to between the two parts that stress is not big; After one use, the accuracy is...

Claims

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Application Information

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IPC IPC(8): C22C38/32F16C3/02
Inventor 张书麟
Owner 宁波瑞国精机工业有限公司