JPS58173047A - Rolling tool for gear - Google Patents

Abstract

PURPOSE:To form a tooth part with a small thrusting force and a high thrusting speed by forming the peak surface in the roughly deformed region of rolled teeth of plural systems in a climbing staircase shape and arranging the peak surfaces of the respective steps on a circular conical coil-like curved surface. CONSTITUTION:The distance between the centers of both tools R3 and R4 is slightly narrowed and a blank gear material W2 is sandwiched between the tools. When the three of R3, R4, W2 are rotated synchronously, a rugged part is formed by plastic deformation on the outside circumferential surface. The material W2 is thereafter thrusted into a rough deformation region A. The rate of thrusting in this case is made the same as the pitch P of the region A. The peak surfaces 21, 22-2n with gradually increasing addendum of rolling teeth 1 gnaw in the recess on the outside circumferential surface of the material W2 and the teeth parts of the addendum increasing gradually from the front side in the rotating direction to the rear side are built up between the adjacent peak surfaces. The roughly shaped material W2 is thrusted into the region B and the thrusting is ceased in said position, whereby the gear is finished to a prescribed size under roration.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pinion-type gear rolling tool used for gear rolling.

Conventionally, this type of rolling tool has a plurality of rolling teeth 1 arranged at equal intervals on the circumference on the outer peripheral surface as shown in FIG. 4, and a gear material W1 is pushed into each rolling tooth 1. It is known to have a phase deformation region A whose tooth height is gradually higher than the starting end located on the side, and a finishing region B which is continuous with the terminal end of the phase deformation region A and has a constant height of tooth height.

A pair of rolling tools R, , R2 are arranged side by side at a predetermined interval, and during rolling, the rolling teeth 1 of the painting tools R, , R2 are rotated in the same direction. A disc-shaped gear material F is pushed between the phase deformation regions A from the tip side to gradually form teeth on the outer peripheral surface thereof, and then the finishing region 8 of the rolled tooth 1 in the drawing tool R, R2 is pushed. Each tooth is finished to the specified dimensions.

However, when rolling between the phase deformation regions A of the rolling tooth 1 with both tools RI=82, a larger null in the extrusion direction acts on the gear material rv than the inclined top surface of each rolling tooth, so In order to do this, a large push-in force is required, and as a result, the push-in amount per unit time is reduced, resulting in a problem that the rolling time per gear becomes longer. In addition, when pushing the gear material between the phase deformation areas A, slipping occurs between the material and both tools, and the rolled tooth crests of both tools R, , R, become damaged. There is also.

In view of the above, the present invention reduces the pushing force of the gear material,
It is an object of the present invention to provide a rolling tool that can increase the pushing speed, and that also prevents slippage between the gear material and both tools.

Hereinafter, embodiments of the present invention will be explained with reference to the drawings.
1st. Figure 2 shows a pair of spur gear rolling tools R installed in parallel so that they can rotate in the same direction and change the distance between the shafts.
3, R4, and they have the same shape. That is, the rolling tools R3 and R1 have a plurality of rolling teeth 1 arranged at equal intervals on the circumference on the outer peripheral surface, and each rolling tooth 1 has a gear material lr.
2. A chamfering region C located on the pushing side and having a tooth height of a constant height, a phase deformation region A that continues to the terminal end of the chamfering region C and whose tooth height gradually becomes higher than the starting end, and the phase deformation region A. A cutting area B that is connected to the end of the tooth and has a certain height.
and is provided. The top surface 2 of the phase deformation region A of the multi-striped rolled tooth 1 is formed in the shape of an upward step from the starting end of the region A, and the top surface 2++22t...21'L of each step is a cone concentric with the tool rotation center. The conical coil-shaped curved surface arranged on the coil-shaped curved surface S. ,i
In figure f, ゛ is set in the opposite clockwise direction, so that when the rolling tools R3 and R4 rotate during rolling work, the top surfaces 20, 2□ of each step with a higher tooth height gradually change, etc. 2n presses the outer peripheral surface of the gear material W2 (that is, the tip circle radius r2>rl). Sl is a conical coil-shaped curved surface S
The end of the winding is shown.

Further, the width of the top surfaces 21, 22+...2n of each stage in the direction of the tool rotation center line, that is, the pitch amount P, is set to have a relationship of p47 with respect to the thickness T of the gear material IV2. Further, the advance angle γ of the conical coil-shaped curved surface S is determined by the indentation amount a per rotation of the diameter of the rolling tools R8 and R1 in the finishing area B, and
The number of rolled teeth of gear material jV2 is Zw and both rolling tools R
3. During the rolling work of R, the distance between the chamfered areas C of the rolling teeth 1 in both rolling tools R3 and R4 is set as the gear material W2.
Rotate both tools R31R4 clockwise to make the gear slightly longer than the diameter of the gear element IW.
2 is placed on standby with its center line parallel to the tool rotation center. Then, the distance between the axes of both tools R3 and R4 is slightly narrowed, and the gear material V' is sandwiched between both tools R8 and R, and the three tools R,
, R4, and W2 are rotated synchronously. As a result, the gear material W
2 is rotated counterclockwise, and an uneven portion is formed on its outer peripheral surface by plastic deformation.

Next, the gear material W2 is pushed between the phase deformation regions A with its center line parallel to the tool rotation center. In this case, the pushing amount a is the same as the pitch amount P of the phase deformation area A. The gear material F2 is rotated counterclockwise between the tools R3 and R4, and phase deformation areas A in the rolled tooth 1 are formed on four parts of the outer peripheral surface of the gear material F2.
The top surfaces 20, 2□, . . . 2n, whose tooth heights gradually increase, dig in, and as a result, a tooth portion whose tooth height gradually increases from the front side to the rear side in the rotation direction is formed between the top surfaces adjacent in the rotation direction. Embankment 6- be raised. In this case, the top surface 21 of each stage of the drawing tools R3, R,
1221...2n are arranged on the conical coil-shaped curved surface S, so the top surface 21.2□ of the rolled tooth 1.

... 2yi and the outer circumferential surface of the gear JV 2 are in face-to-face contact with each other, and therefore no tension in the extrusion direction acts on the gear material jr2, so the pushing force can be reduced and the pushing speed can be increased. Then, the phase-deformed gear material IV2 is pushed between the finishing regions 8, and by stopping the pushing at that position, each tooth portion is finished to a predetermined size without being rotated.

FIG. 3 shows a rolling tool R6 for rolling helical gears. In this case, except for the fact that the rolling teeth 1 are inclined, the other configuration is the above-mentioned spur gear rolling tool R3. , R1.

As described above, according to the present invention, the outer circumferential surface has several rows of rolled teeth arranged at equal intervals on the circumference, and each rolled tooth has teeth gradually formed from the starting end located on the gear material pushing side. In a rolling tool for one-wheeled vehicle, which has a phase deformation region where the height increases, and an L-edge region that is connected to the end of the phase deformation region and has a tooth height of a constant height, each rolling tooth is A chamfered region with a constant height of tooth height is provided, which is connected to the starting end of the deformed region, and is formed in a step-like manner upward from the starting end of the region, which is the top surface of the phase deformed region of the multiple rolled teeth. Since the top surface is arranged on a conical coil-shaped curved surface concentric with the tool rotation center, an uneven part is formed on the outer circumferential surface of the gear material in the chamfering region of the rolled tooth, and the relationship between the rolled tooth and the gear material in the phase deformation region is reduced. The top surface of the phase deformation region of the rolled tooth and the outer circumferential surface of the gear material can be brought into face-to-face contact, and the nulliness in the extrusion direction with respect to the gear material can be prevented.
As a result, the outer peripheral surface of the gear material can be formed into a toothed shape with a small push-in force and speed, and the rolling productivity of the gear can be greatly improved. In addition, since the outer peripheral surface of the gear material is continuously plastically deformed in the phase deformation region of the rolled tooth, a uniform bulge is generated on the outer peripheral surface of the gear material in the circumferential direction, which causes the metal structure to be cut. It becomes a precise flow line without
A gear with high strength can be obtained.

[Brief explanation of the drawing]

1st. Fig. 2 shows a rolling tool for spur gears which is the first embodiment of the present invention, Fig. 1 is a front view, and Fig. 2 is a drawing shown in Fig. 1.
3 is a perspective view of a helical gear rolling tool according to the second embodiment of the present invention, and FIG. 4 is the same as FIG. 2 of a conventional semi-gear rolling tool. FIG. A... Phase deformation area, B... Finishing area, C... Biting area, S... Conical coil shaped curved surface, R5, R4...
Rolling tool, W2...Gear material, 1...Rolling tooth, 2.21.22-2n...Top surface 9
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Claims (1)

[Claims] The outer peripheral surface has a plurality of rolled teeth arranged at equal intervals on the circumference, and each rolled tooth has a phase deformation region where the tooth height gradually increases from the starting end located on the gear material pushing side. In a gear rolling tool that is provided with a finishing region that extends to the end of the phase deformation region and has a constant height, each rolling tooth has a finishing region that extends to the start end of the phase deformation region and has a tooth height of a constant height. The top surface of the phase deformation region of the plurality of rolled teeth is formed in the shape of a step ascending from the starting end of the region, and the top surface of each step is formed in the shape of a conical coil concentric with the tool rotation center. Gear rolling tool arranged on a curved surface.