JPS59127928A - Correcting method of splined shaft - Google Patents

Abstract

PURPOSE:To correct the outside diameter of a splined shaft with good workability and accuracy by pressurizing the splined shaft and passing the same through a splined nut. CONSTITUTION:The outside diameter of a splined nut 3 is worked and is press- fitted into a heated holding ring 4, then the ring is allowed to cool to an ordinary temp. A pressure is exerted on a splined shaft 1 to pass the shaft about 1-3 times through the nut 3 thereby reducing and correcting the outside diameter thereof. The finish working of the shaft 1 is thus remarkably improved and the working method thereof requires just passing of the shaft through the splined nut, whereby the splined shaft is easily corrected.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] The present invention relates to a method for modifying a spline shaft. Spline shafts are rough-machined using a bob machine, and then finished using a tooth-type grinder.In mass production, the machining accuracy is determined by measuring the diameter using an overbin to avoid machining tolerances of 20 to 30 μm. I can do it. In FIG. 1, 1 is a spline shaft, 2 overbins, and α is the outer diameter of the spline shaft 1 measured by overbin 2. In FIG. Even smaller processing tolerances,
For example, in order to reduce the tolerance to 10 μm or less, a spline shaft with a tolerance of 10 μm or more must be refinished using a tooth type grinder. There is no guarantee that the refinished product will pass the test, as there is no guarantee that the refinished product will pass the test.
Moreover, it is difficult to implement because it disrupts the production process. Therefore, conventional machining methods are carried out within the range of machining tolerances of 20 μm to 30 μm, and therefore the production of spline shafts that require precision of machining tolerances of 10 μm or less should avoid a high incidence of rejected products. I can't. The present invention aims to solve this problem.

[Structure of the Invention] The present invention provides a spline shaft which has been finished with a tooth profile grinder, and which has the same tooth profile as the spline shaft and which is connected by shrink fit or press fit. A method for modifying a spline shaft, characterized in that the outer diameter of the spline shaft is modified by passing the spline nut under pressure, the inner diameter of which can be set to an arbitrary value in a smaller direction by adjusting the be.

An embodiment of the invention will be described with reference to FIGS. 2 and 3. FIG. 2 shows a correction processing device for correcting rejected spline shafts that have been finished using a tooth type grinder. Jin's correction processing device consists of a spline nut 3 made of a metal material with a hardness higher than that of the spline shaft to be processed, and a retaining ring 4 connected to the spline nut 3 by shrinkage (tight fit or press fitting). The spline nut 3 has a tooth pattern of the same shape as the spline shaft machined on its inner surface by broaching, and its outer diameter is slightly larger (maximum o, 1 m) than the inner diameter C of the retaining ring 4. The method of joining the spline nut 3 and the retaining ring 4 will be explained using a specific example.The outer diameter of the spline nut was machined to 35.08 m, and the thickness was 20 II.
The inner diameter C of the retaining ring 4 of I+I+ was machined to 35.00mm and the interference was adjusted to D8-, and the spline nut 3 was press-fitted into the retaining ring 4 heated to 400℃, and after cooling naturally to room temperature, the spline was removed. When we measured the inner diameter of nut 3, it was 0.065 m smaller than before shrink fitting. According to the results of the above experiment, the inner diameter of the spline nut 3 can be reduced by approximately 80% of the interference between the spline nut 6 and the retaining ring 4.

-! In addition, due to the expansion of the inner diameter, l at around φ35m
d It is possible to manufacture it if there is a tightening allowance of 0.1 max.
Moreover, it can be put to practical use.

FIG. 3 shows a state in which the spline shaft 1 is corrected by the correction processing apparatus shown in FIG. 2. As shown in FIG. Reference numeral 5 denotes a pedestal of a correction processing device, and 6 a processing piston, which applies pressure of 3 tons to 5 tons to the spline shaft 1. The spline shaft 1 passes through the spline nut 3 concavely by 1 m3, so that the outer diameter α measured by the over pin 2 is 0.0 from o, oos.
The reduction is corrected within the range of 15smt.

[Effects of the Invention] Since the present invention has the above-mentioned structure and operation, two problems that cannot be avoided in conventional finishing methods are achieved.
The machining tolerance of 0 to 30 μm can be reduced to 5 to 15 μm, and the accuracy of finishing the spline shaft is significantly improved. In addition, the processing method is extremely simple, requiring only pressurizing the spline shaft and simply passing the spline nut, and has many excellent effects, such as good stripability.

[Brief explanation of the drawing]

Fig. 1: A diagram showing the state in which the outer diameter of the spline shaft is measured with an over pin. Fig. 2N: A diagram showing the correction processing device used in the present invention, in which (a) is an exploded side view and (b) is an exploded plan view. ,(c)
is an assembled side view. Figure 3: Figure 1 showing the state in which the finishing method of the present invention is carried out. 1... Spline shaft, 2... Over pin, 3...
・Spline nut, 4... Retaining ring, 5... Pedestal, 6... Pressure piston 5- Figure 1

Claims (1)

[Claims] The spline shaft has been finished with a tooth type grinder.
The spline nut has the same tooth profile as this spline shaft, and its inner diameter can be set to any value in the smaller direction by adjusting the interference with the retaining ring, which is connected by shrink fit or press fit. A method for modifying a spline shaft, characterized in that the outer diameter of the spline shaft is modified by