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Chain wheel quenching method and quenching inductor

A technology for quenching inductors and sprockets, which is applied to furnace types, furnaces, heat treatment furnaces, etc., can solve the problems of quenching cracks in medium carbon alloy structural steel, difficulty in making intermediate frequency quenching inductors, and uneven hardness of tooth surfaces and roots. , to achieve the effect of ensuring quenching hardness, realizing mass production, and easy processing

Inactive Publication Date: 2014-12-10
CHONGQING DAJIANG IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The purpose of the present invention is to overcome the deficiencies in the prior art, to provide a simultaneous heating and quenching method of intermediate frequency quenching inductors connected in parallel by spot welding of the main and auxiliary profiling induction coils and intermediate frequency induction of all teeth of the sprocket, which can solve the problem of adopting The hardness of the tooth surface and tooth root along the alveolar single tooth intermediate frequency induction hardening method is uneven and the hardness difference is large, which causes the problem of low fatigue strength and wear resistance, and solves the difficulty of making the alveolar single tooth intermediate frequency quenching inductor. The carbon alloy structural steel tooth surface is prone to quenching cracks, while improving the efficiency of the sensor and production efficiency, reducing production costs, and realizing mass production of sprockets

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  • Chain wheel quenching method and quenching inductor
  • Chain wheel quenching method and quenching inductor
  • Chain wheel quenching method and quenching inductor

Examples

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Effect test

Embodiment 1

[0039] Example 1: According to ISO 6972, the number of teeth in ISO 6972 is 8, and the curved plate chain sprocket on the top surface of the W82 flat-topped teeth is quenched by medium-frequency induction and simultaneous heating and quenching of all teeth:

[0040] figure 2 13 in it is the sprocket used for agricultural machinery products and the chain number is W82. The material is 40Cr and 42CrMo, and the diameter of the addendum circle is d a is 227mm, the index circle diameter d is 204.2mm, and the dedendum circle diameter d f 172.5mm, pitch p 78.1mm, tooth depth 27.25mm, tooth width b f 35mm, pressure angle θ is 11°, alveolar center separation s is 8mm, there is a root arc between the tooth root and the tooth side, the chamfer is 56° on both ends of the tooth root, and the chain roller diameter is 31.75 mm, heat treatment requirements (1) Quenching and tempering after forging 225~255HBW; (2) Quenching on the surface of the tooth groove, the depth of the hardened layer...

Embodiment 2

[0045] Example 2—Surface heating and quenching process of full-tooth mid-frequency induction simultaneous heating and quenching process of arc tooth top surface sprocket with 8 teeth and tooth tops of R3

[0046] Figure 6 The sprocket 13 in the middle is made of 40Cr and 42CrMo, and the diameter of the addendum circle is d a is 254mm, the index circle diameter d is 204.2mm, and the dedendum circle diameter d f 171.45mm, pitch p 78.1mm, tooth depth 41.275mm, tooth width b f is 28mm, the separation distance s of the center of the alveolar is 4.76mm, there is a root arc between the tooth root and the tooth side, the two ends of the tooth root are chamfered at 30°, the diameter of the chain roller is 30.5mm, heat treatment requirements (1 ) Quenched and tempered after forging 241 ~ 286HBW; (2) Quenched on the surface of the tooth groove, the depth of the hardened layer is 7 ~ 9mm, and the hardness is ≥ 55HRC. The quenching and heating equipment, quenching and heating method, c...

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Abstract

The invention discloses a chain wheel quenching method and a quenching inductor. The inductor comprises a main induction coil, a connection plate, a water inlet pipe and a water outlet pipe, wherein the main induction coil comprises a valid ring profiled as per the full tooth profile of a chain wheel, bus-bars communicated with the two ends of the valid ring, and transitional pipes communicated with the bus-bars; the water inlet pipe and the water outlet pipe are communicated with the transitional pipes respectively; the connection plate is welded on the outer side of the transitional pipes; a rectangular copper tube serves as the main induction coil; the parts, corresponding to gear teeth, of the valid ring of the main induction coil are subjected to sequence welding as per tooth profile, so as to form a shape similar to the gear tooth profile; one or more turns of auxiliary induction coils are welded in parallel on the main induction coil. Through the adoption of the technology provided by the invention, the chain wheel full tooth intermediate frequency induction simultaneous heating and quenching can be realized, that is, the chain wheel is subjected to full tooth heating by adopting the intermediate frequency induction simultaneous heating method which comprises the steps of full tooth preheating, then air cooling, and finally reheating, so that the production efficiency is improved, and the volume production for the chain wheel surface quenching can be realized.

Description

technical field [0001] The invention relates to the technical field of heat treatment of metal materials, in particular to a medium-frequency induction simultaneous heating and quenching technology for heavy-duty sprockets. Background technique [0002] The sprocket is used in conjunction with the chain, and its main purposes are transmission, transportation and force transmission. When the chain meshes in and out smoothly on the sprocket, the root of the tooth bears a large friction force and torque, and the meshing position is on the tooth surface and the tooth root. Therefore, when the sprocket is induction heated and quenched, it is required that the tooth surface and the tooth root There is a certain hardened layer and distributed along the tooth profile to ensure the durability of the sprocket. figure 2 and Figure 7 The blackened part in the figure is the local hardened layer in the form of the best hardened layer distribution on the surface of large and medium-size...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D9/32C21D1/42
CPCY02P10/25
Inventor 李小银盛陈张种宝李国庆彭涛余长海
Owner CHONGQING DAJIANG IND
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