Intermediate-frequency induction quenching method for spline shaft fork

Abstract

The invention discloses an intermediate-frequency induction quenching method for a spline shaft fork. The intermediate-frequency induction quenching method comprises the following steps of: defining a water spraying area for a wrist part of the spline shaft fork and defining a heating area for a rod part of the spline shaft fork; performing intermediate-frequency induction heating on the heating area of the rod part while continuously or intermittently spraying water to two fork ear basal parts of the wrist part, and controlling the temperature of a transition area of the heating area within a range of 850-900 DEG C while controlling the temperature of the two fork ear basal parts of the wrist part below 200 DEG C; and lastly, enabling the depth of a hardening layer at the transition area to be 2-3mm, stopping heating, spraying water to the heating area to cool for 5-10 seconds, stopping spraying water for the water spraying area as well as the heating area, and then finishing quenching. According to the method disclosed by the invention, the two fork ear basal parts are never in a thermoplastic state, the higher strength of the two fork ear basal parts of the spline shaft fork is kept, the size change of a space between two clamp spring slots is within plus / minus 0.01mm, and the replacement frequency and cost are reduced under the condition of meeting the performance requirement of a transmission shaft.

Description

technical field [0001] The invention belongs to the technical field of heat treatment of mechanical parts, and in particular relates to a spline shaft fork medium-frequency induction heating and quenching method. Background technique [0002] Such as figure 1 As shown, the spline shaft fork is composed of the rod part 1 and the wrist part 2. The section A of the cylindrical heating area of ​​the bar part 1 needs to be quenched by intermediate frequency induction heating. The depth of the layer is between 3-4mm (the technical requirement is 2-4mm), and the heating temperature can reach between 1000-1005°C, which leads to the conduction of heat to the wrist 2, causing the temperature of the fork ear 3 and the root of the fork ear 4 to rise At 400-500°C, the material enters a plastic state, and plastic deformation occurs under the action of internal stress. The size of the fork lug 3 and the fork lug 4 shrinks, resulting in the snap ring groove 5 on the fork lug 3 and the snap...

AI Technical Summary

Problems solved by technology

[0002] like figure 1 As shown, the spline shaft fork is composed of the rod part 1 and the wrist part 2. The section A of the cylindrical heating area of ​​the bar part 1 needs to be quenched by intermediate frequency induction heating. The depth of the layer is between 3-4mm (the technical requirement is 2-4mm), and the heating temperature can reach between 1000-1005°C, which leads to the conduction of heat to the wrist 2, causing the temperature of the fork ear 3 and the root of the fork ear 4 to rise At 400-500°C, the material enters a plastic state, and plastic deformation occurs under the action of internal stress. The size of the fork lug 3 and the fork lug 4 shrinks, resulting in the snap ring groove 5 on the fork lug 3 and the snap ring on the fork lug 4. The distance L between the spring grooves 6 is reduced by 0.08-0.14mm, and the quality is extremely unstable, which directly affects the assembly of the universal joint and the circlip, causing the universal joint bowl to be easily crushed, and also affecting the use of the drive shaft life

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