JPH0524414Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention is a spline for removing burrs generated on the tooth surface of a spline shaft when an annular groove is drilled on the tooth outer surface of the spline shaft. Regarding deburring dies.

[Prior Art] As shown in FIGS. 5 and 6, when an annular groove 2 is bored on the outer periphery of a general power transmission spline shaft 1, an annular groove 2 is formed on the periphery of each tooth 3 as shown in FIG. Burrs 4 as shown are generated. Conventionally, shaving press has been commonly used as this type of burr removal means.

For example, a shaving cutter as disclosed in Japanese Utility Model Application Publication No. 54-65092 is known. This is done by fixing a shaving cutter with chamfered tooth tips to a shaving press machine.
The end face is finished by cutting at a relatively slow press speed by matching each tooth of the spline that is the object to be cut.

[Problems to be solved by the invention] Although deburring using the above method can achieve high precision, the shaving processing speed is slow, resulting in poor processing efficiency, and the shaving cutter itself is made of die steel or carbide. Because it has to be used,
Processing costs become high.

For example, as a means other than the above,
There is a burr removal device for a gear shaper disclosed in Japanese Patent No. 170492. In this system, a gear material, which is a workpiece, is arranged so that it can freely rotate, and a pinion cutter installed in parallel cuts the teeth, while a gear on the opposite side of the gear material is moved in the X-axis direction. A movable body is provided, a cutting tool is fixed to this, and the end face of the cutting tool is brought into contact with the end face (burr generation surface) of the gear material to remove the burr by grinding.

However, with the above conventional means, although the number of processing steps and processing time is not as high as that of the shaving press, it requires a considerable amount of processing time, resulting in high processing costs, and is therefore unsuitable for high-volume, low-cost processing.

As described above, as a deburring means which requires a reduction in the number of man-hours, a means of press working using a spline hole die is suitable. For example, as shown in FIG. 8, a spline die 6 whose tooth profile matches the spline shaft 1 is fixed to a mounting base 5, and a guide plate in which a tapered guide hole 7 is formed on the upper surface of the spline die 6. 8 is fixed, the spline shaft 1 is inserted from above the guide plate 8, and the burrs 4 on each tooth are sheared off by pressing from above. In this case, the machining speed is faster than cutting with a shaving press or grinding with the burr removal device, so the machining cost is reduced, but backlash adjustment with the spline shaft is not possible, so as shown in Figure 9. A part of the tooth did not completely match the die hole 9, and as a result, the burr 4 remained.

Therefore, as a means to solve the above-mentioned problems, the present applicant proposed a spline deburring die shown in FIG. 10 in Utility Application No. 118563/1983. The spline hole die 13 fixed to the mounting base 11 is divided into three parts, and the uppermost and lowermost dies 16 and 18 have die holes 19a and 19c for shearing corresponding to the spline teeth. A spacer (dice 17) with a guide hole 19b that matches the tooth profile is inserted in the middle stage,
Furthermore, on top of the above three-stage spline hole die,
Guide plate 14 with tapered hole 20 formed therein
is arranged so that backlash adjustment with the axis of the spline shaft, which is the workpiece, can be performed. With this configuration, one side of the tooth 3 is sheared by the first die 16, and the burr 4 there is sheared by the second die 16.
Escape to dice 17. On the other hand, the opposite side of the tooth 3 is sheared by the third die 18. However, when processing workpieces with different overpin diameters,
During the above-mentioned buck crush adjustment, the operator manually moves the phase (between pin diameter) of each spline hole die, so as shown in FIG. It may be difficult to remove burrs.

[Purpose of the invention] The present invention was made in view of these circumstances, and it is a die that fully utilizes the advantages of a three-part die, has excellent processing ability, and has low processing costs. The spacer die placed in the middle stage is always movable in the circumferential direction so that it always automatically corresponds to the spline shaft that is the workpiece, ensuring reliable deburring even if the overpin diameter of the workpiece changes. The object of the present invention is to provide a spline deburring die that allows deburring.

[Means for solving the problem] A die with a spline hole for removing burrs generated on the spline tooth surface when an annular groove is formed on the outer periphery of the spline shaft is divided into three parts, and a guide plate for inserting the spline and a mounting base are formed. In addition, the first
The second stage die is pressed in the circumferential direction against the stage and third stage dies with a force that can resist the reaction force during deburring, and the second stage die is pressed against the spline holes of the first and second stage dies. A phase difference is formed in the spline hole of the second stage die.

[Operation] With this configuration, the first and third stages
The spline hole of the second stage die is in phase with the spline hole of the second stage die (between pin diameter)
The between-pin diameter is smaller than the over-pin diameter of the workpiece due to a difference between Since it is movable while being pressed by the pin, it reliably comes into close contact with all tooth surfaces of the workpiece, so even if the overpin diameter of the workpiece changes, it is possible to completely remove burrs without having to make backlash adjustments.

[Example] Hereinafter, an example of a spline deburring die according to the present invention will be described with reference to FIGS. 1 to 4.

Figure 1 is a central vertical sectional view of the die of the present invention, Figure 2
The figure is an explanatory plan view of the same as above, Fig. 3A is a perspective view showing the phase difference of the dies, Fig. 3B is an explanatory view showing the phase difference of the dies, and Figs. 4A and B are explanatory views showing the deburring operation. be.

In these figures, reference numeral 21 denotes a mounting base for fixing to a press machine (not shown), and an opening 22 is formed in the center of the mounting base. A die portion 23 is placed, and a guide plate 24 is placed above the die portion 23, and the above-mentioned members are securely fastened and fixed using bolts, oil pressure, air pressure, or the like. The die section 23 is divided into three layers as shown in the figure, from the top: a first die 25, a second die 26,
It has a structure in which third dies 27 are stacked in this order, and spline holes 28a, 28b, 28c are bored in the center of each of them to correspond to the tooth profile of the spline shaft 1, which is the workpiece. It functions as a spacer as well as deburring.

Further, the second die 26 is rotatable on its axis, and a coil spring 29 as a biasing member is interposed between one end of its circumference and the mounting base 21, so that the second die 26 has a rotational circumference. A predetermined pushing force capable of resisting the reaction force during deburring in the tangential direction is always applied. For example, three coil springs 29 are arranged at intervals of 120 degrees, and smooth the rotational force of the second die 26. The pressing force of the coil spring 29 against the second die 26 is adjusted by an adjusting screw 29a screwed into the mounting base 21. In addition, the mounting base 21 and the second
A stopper 30 is provided at another location on the die 26 to restrict the rotation range of the second die 26.

As a result, the second die 26 is constantly biased with rotational pushing force in its circumferential direction, and is free to move in the circumferential direction.

The dice divided into three parts are divided into three parts.
and each spline hole 28 of the third die 25, 27
a, 28c, the spline hole 28b of the second die 26, to which rotational force is applied in the circumferential direction by the elastic force of the coil spring 29, has a phase difference as shown in FIGS. 3A and 3B. It is occurring. Therefore,
When looking at the axis of the die from a plane, it means that the phase (between pin diameter) of the spline hole die with the split configuration is negative than the overpin diameter of the workpiece. Therefore, by inserting a workpiece with a different overpin diameter through the tapered supply port 24a of the guide plate 24 and pressing it, one side of the tooth 3 is inserted into the spline hole 28a of the first die 25 as shown in FIGS. 4A and 4B. The burr is sheared off, and then the second die 26 forces the spline teeth of the workpiece toward the opposite side to form the spline hole 28 of the second die 26.
The burr on the opposite side is sheared off at b, and then transferred to the third die 27, where the burr left behind by the first die 25 is sheared off at the spline hole 28c of the third die 27.

In the above state, even if the overpin diameter of the workpiece changes, the second die 26 can freely move in the circumferential direction with a constant force, so there is no need to manually adjust the backlash with the spline shaft. Done,
The spline hole reliably comes into close contact with all teeth of the workpiece, and burrs can be sheared off.

[Effects of the invention] As explained above, according to the invention, not only can all the tooth surfaces of the workpiece be reliably deburred, but even if the overpin diameter of the workpiece changes, the alignment with the spline shaft can be improved each time. Since there is no need for the operator to perform deburring adjustment, the deburring work is efficient, and has the effect of reducing processing costs and stabilizing quality.

[Brief explanation of drawings]

1 to 4 relate to an embodiment of the spline deburring die of the present invention, FIG. 1 is a longitudinal cross-sectional view showing the structure of the die, and FIG. 2 is a B--
A sectional view taken along line B, FIG. 3A is a perspective view showing the phase difference of the die, FIG. 3B is an explanatory view showing the phase difference, FIGS. 4A and B are explanatory views showing the deburring operation, and FIGS. 11 shows a conventional spline deburring means, FIG. 5 is a longitudinal sectional view of a workpiece (spline), FIG. 6 is a sectional view taken along line A-A in FIG. 5, and FIG.
The figure is a partially enlarged plan view showing the state of burrs formed on spline teeth, FIG. 8 is a vertical cross-sectional view showing the configuration of a conventional integrated spline hole die, and FIG. 9 is a plan view showing the state of deburring with the same die. Figure, 1st
FIG. 0 is a cross-sectional view showing the structure of the die according to the application of the present applicant, and FIG. 11 is a plan view showing a deburring state using the same die. 21...Mounting base, 23...Dice part, 24...
Guide plate, 25...1st die, 26...
Second die, 27...Third die, 28a, 28
b, 28c...Spline hole, 29...Coil spring, 30...Stopper.

Claims (1)

[Scope of utility model registration request] A die provided with a spline hole for removing burrs generated on the spline tooth surface when an annular groove is formed on the outer periphery of the spline shaft is divided into three parts and stacked and arranged between a guide plate for spline insertion and a mounting base, The second stage die is moved in the circumferential direction against the first and third stage dies to resist the reaction force during deburring so that the overpin diameter of the spline shaft, which is the workpiece, always comes into close contact with the tooth surface. A spline deburring die characterized in that the deburring die for splines is pressed and biased by the force obtained to form a phase difference between the spline holes of the second stage die and the spline holes of the first and second stage dies.