Method for processing involute spline hole and broaching tool
A technology of involute splines and spline holes, which is applied to metal processing equipment, manufacturing tools, components with teeth, etc. Problems such as keyholes, to achieve the effect of high processing pass rate
Pending Publication Date: 2019-04-02
AVIC LIYUAN HYDRAULIC
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Problems solved by technology
However, for some workpieces with special materials and high-precision parameter requirements, such as the rotor used in the plunger pump, the material is 40CrNiMoA, which requires heat treatment to 33-38HRC, and the parameters of the spline hole are very strict. The machining method with spline holes will cause very irregular deformation during the overall heat treatment. Even if the holes are pulled again, it is difficult to ensure qualified spline holes. The pass rate of spline holes is not higher than 10%. , the processing pass rate is low
Therefore, existing spline hole processing method and the spline hole processed by involute spline broach have the shortcoming of low processing pass rate
Method used
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[0022] The present invention will be further described below in conjunction with the accompanying drawings and embodiments, but not as a basis for limiting the present invention.
[0023] Example. Process the involute spline hole of the rotor in the plunger pump. The material of the rotor is 40CrNiMoA, which requires heat treatment to 33-38HRC. The spline hole is as follows: Figure 4 As shown, the parameters required for the spline hole are as follows, the diameter of the root circle of the spline hole Spline hole addendum circle diameter Spline hole pitch circle diameter D 3 =34mm, the width of the tooth groove of the spline hole S=1.69mm, the width of the tooth groove of the spline hole refers to the arc length of the tooth groove of the spline hole on its pitch circle.
[0024] A method for processing an involute spline hole, comprising the following steps,
[0025] a. According to the parameters of the spline hole, first use it to pull out the toothed hole on the wo...
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Abstract
The invention discloses a method for processing an involute spline hole and a broaching tool. The method comprises the following steps that a, according to the parameters of a spline hole, a tooth-shaped hole is formed in a workpiece, the section of the tooth groove of the tooth-shaped hole is in a trapezoid shape, and the cross section of the tooth-shaped hole is smaller than that of the spline hole so as to obtain a product A; b, heat treatment is performed on the product A, so that the hardness of the product A reaches 33-38 HRC, and a product B is obtained; and c, the tooth-shaped hole ofthe product B is pulled again, and the involute spline hole is obtained. The method has the advantage of being high in machining qualified rate.
Description
technical field [0001] The invention belongs to the field of spline hole processing of plunger pumps. In particular, it relates to a method for processing an involute spline hole and a broach. Background technique [0002] An involute spline is a type of spline used to transmit torque. The involute spline is used for the connection between different workpieces with large load, high centering accuracy and large size. There are multiple teeth in the hole matched with the involute spline (referred to as the spline hole), and there is a radial force on the teeth when loaded, so heat treatment is required to increase the hardness of the teeth. The processing of the spline hole is to first use the involute spline broach to roughly pull out the tooth-shaped hole on the workpiece, then heat-treat the workpiece, and then use the involute spline broach to pull the tooth-shaped hole again to obtain a spline. The key hole, the purpose of re-drawing the hole is to eliminate the deform...
Claims
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IPC IPC(8): B23F5/28B23F21/26B23P15/00
CPCB23F5/28B23F21/26B23P15/00
Inventor 倪玲蒋丹程琳舒代游
Owner AVIC LIYUAN HYDRAULIC