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Intermediate frequency quenching and tempering heat treatment process and special equipment for pin shaft

A quenching and tempering heat treatment and special equipment technology, which is applied in heat treatment equipment, heat treatment furnaces, manufacturing tools, etc., can solve problems such as uneven quenching and tempering, quenching and cracking of pin edges and corners, and achieve low production costs, strong mechanical properties, and high strength Effect

Active Publication Date: 2014-06-25
山东隆沃机械制造有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The invention provides an intermediate-frequency quenching and tempering heat treatment process for pin shafts and its special equipment, which are used to solve the uneven quenching and tempering and tempering heat treatment of pin shafts in the prior art, especially for large-diameter pin shafts above Φ80mm. The problem of quenching and cracking of edges and corners

Method used

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  • Intermediate frequency quenching and tempering heat treatment process and special equipment for pin shaft
  • Intermediate frequency quenching and tempering heat treatment process and special equipment for pin shaft
  • Intermediate frequency quenching and tempering heat treatment process and special equipment for pin shaft

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Example 1: The medium-frequency tempering heat treatment is carried out on a pin shaft with a diameter of φ85mm and a material of 40Cr. The special equipment for intermediate-frequency tempering heat treatment of the pin shaft is the same as the above-mentioned special equipment for intermediate frequency tempering heat treatment of the pin shaft.

[0047] After surface cleaning, the pin shaft with a diameter of φ85mm and a material of 40Cr is sent to the quenching heating mechanism 3 for heating under the guidance of the quenching feeding mechanism 1. During heating, the DC voltage of the special equipment for intermediate frequency quenching and tempering heat treatment of the pin shaft is 420V, the intermediate frequency voltage is 640V, the frequency of the intermediate frequency induction power supply is 1000Hz, and the intermediate frequency power is 250KW. The temperature is measured and controlled by the infrared photoelectric temperature measuring device, reachin...

Embodiment 2

[0048] Embodiment 2: The medium-frequency quenching and tempering heat treatment is carried out for the pin shaft with a diameter of φ95mm and the material is 40Cr. The special equipment for the intermediate frequency tempering heat treatment of the pin shaft is the same as that in Embodiment 1.

[0049] After surface cleaning, the pin shaft with a diameter of φ95mm and a material of 40Cr is sent to the quenching heating mechanism 3 for heating under the guidance of the quenching feeding mechanism 1. The DC voltage of the special equipment for intermediate frequency tempering heat treatment of the pin shaft is 460V, the intermediate frequency voltage is 680V, ​​the frequency of the intermediate frequency induction power supply is 1000Hz, and the intermediate frequency power is 220KW. The temperature is measured and controlled by the infrared photoelectric temperature measuring device, and it is operated after reaching 850°C. Out of the quenching heating mechanism 3 to the pre-c...

Embodiment 3

[0050] Embodiment 3: The medium-frequency quenching and tempering heat treatment is carried out for the pin shaft with a diameter of φ95 mm and the material is 42CrMo. The special equipment for the intermediate frequency tempering heat treatment of the pin shaft is the same as that in Embodiment 1.

[0051] After surface cleaning, the pin shaft with a diameter of φ95mm and a material of 42CrMo is sent to the quenching heating mechanism 3 for heating under the guidance of the quenching feeding mechanism 1. The traveling speed during heating is 8mm / s, and the quenching heating temperature is 830-840 ℃, when quenching and heating, the DC voltage of the special equipment for intermediate frequency quenching and tempering heat treatment of the pin shaft is 450V, the intermediate frequency voltage is 640V, the frequency of the intermediate frequency induction power supply is 1000Hz, and the intermediate frequency power is 220KW. It is measured and controlled by the infrared photoelect...

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Abstract

The invention discloses an intermediate frequency quenching and tempering heat treatment process and special equipment for a pin shaft, which belongs to the field of quenching and tempering heat treatment of metals and is mainly used for intermediate frequency quenching and tempering heat treatment of the pin shaft. The heat treatment process comprises the following steps: step one: surface treatment for the pin shaft having the big diameter of more than Phi 80mm; step two: quenching, wherein a quenching stage includes quenching heating, precooling an end face, water-cooling a quenching and spraying mechanism; step three: tempering, wherein a tempering stage includes tempering heating and warming, water-cooling or air-cooling; and step four: checking. The intermediate frequency quenching and tempering heat treatment special equipment for the pin shaft mainly comprises a quenching heating mechanism, a quenching spraying mechanism as well as a precooling device and a tempering heating mechanism which are cooperatively used with the quenching heating mechanism and the quenching spraying mechanism; and a feeding mechanism and a discharging mechanism corresponding to the quenching heating mechanism and the tempering heating mechanism are mounted on the quenching heating mechanism and the tempering heating mechanism. By using the intermediate frequency quenching and tempering heat treatment process and the special equipment for the pin shaft, the problems that the quenching crack of pin shaft edges and nonuniform quenching and tempering occur the pin shaft having a big diameter of more than Phi 80mm in the prior art are solved.

Description

technical field [0001] The invention belongs to the field of metal quenching and tempering heat treatment, and in particular relates to a medium-frequency quenching and tempering heat treatment process of a pin shaft and its special equipment. Background technique [0002] Quenching and tempering heat treatment for pin shafts, especially for large-diameter pin shafts above Φ80mm, if ordinary quenching methods are used for heat treatment, the hardenability is poor and the hardened layer is shallow, which often fails to meet the requirements after quenching and tempering Comprehensive mechanical properties of strengthening and toughness, so when quenching and tempering heat treatment of large-diameter pins above Φ80mm, medium-frequency induction penetration heating is often used for quenching and tempering, so that the pins can achieve diathermic heating, and quenching and tempering can be completed at one time , Automatic loading and unloading, low labor intensity, the cylind...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D9/28C21D1/25
Inventor 杨宝山
Owner 山东隆沃机械制造有限公司