JPS6324782B2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a rolling device.

As a conventional rolling device, there is one shown in FIG. 1, for example. That is, 1 is a die holder, and a pair of parallel flat dies 2 and 3 are attached to this die holder 1 at a predetermined distance from each other. The mutually opposing surfaces of the flat dies 2 and 3 are die surfaces 4 and 5, and a plurality of teeth 6 for forming a spline as a tooth profile are formed on these die surfaces 4 and 5. There is. The flat dies 2 and 3 are moved relative to each other by a drive mechanism (not shown), that is, in synchronization with each other, one moves in the direction of arrow y and the other moves in the opposite direction to perform spline rolling. Using such a conventional rolling die, a workpiece having a spline on its outer periphery and an annular groove provided in the spline, for example, a spline portion of an automobile axle shaft having a groove for a C-shaped ring; The molding process is as follows. 1st
The second method is a method in which an annular groove is turned into a workpiece using a lathe, etc., and then a spline is formed on the outer periphery of the workpiece using the rolling device. This is a method in which a spline is rolled on the outer periphery of the workpiece, and then an annular groove is turned using a lathe or the like. However, when a workpiece having a spline and an annular groove is formed using such a conventional rolling die, no matter which of the above methods is adopted, the former has an annular groove due to the final processing. In the latter case, there was a problem in that burrs were generated on the spline side, and as a result, a burr removal process was required.

This invention was made by focusing on such conventional problems, and has a plurality of teeth for rolling on each die surface, and a workpiece is held between a pair of dies. , in a rolling device that forms a tooth profile on the outer periphery of a workpiece by relatively moving the dies, on a die surface of at least one die of the pair of dies, protruding from the die surface and extending in the direction of movement. An extending protrusion having a triangular cross section and a predetermined apex angle is provided, and the apex angle is equal to the first of the lower grooves that are preformed on the outer periphery of one end of the workpiece prior to forming the annular groove. is smaller than the opening angle of the slope portion and larger than the opening angle of the second slope portion of the lower groove, and forms an annular groove on the outer periphery of one end of the workpiece by engaging the protrusion with the lower groove, At the same time, it is an object of the present invention to solve the above-mentioned problems by forming grooves extending in the axial direction on the outer periphery using teeth on the die surface.

The present invention will be explained below based on the drawings.

Figures 2, 3, 4, 5, 6, and 7 are diagrams showing an embodiment of the present invention. First, let me explain the configuration.
10 is a pair of flat dies that are attached to the die holder 1 shown in FIG. 1 with their die faces 11 facing each other (only one is shown to avoid complexity); 1
1 has a plurality of teeth 12 for forming a spline as a tooth profile.

The flat die 10 is moved in the direction of the arrow y to process the workpiece, and the teeth 12 for spline rolling are formed as follows. First, in order to improve the bite during spline rolling, the height of the teeth 11 in the A section of the die surface 11 is not shown in detail, but the height is initially made low, and The height is gradually increased in the opposite direction, and finishing teeth 11 are provided all over the B section. Rectangular depressions 13 and 14 with a constant width extending along the moving direction of the flat die 10 are formed on one side of both ends of the die surface 11, and each depression 1
Rectangular rolling pieces 15 and 16 are attached to 3 and 14, respectively. Each rolled piece 15,1
6 is provided with protrusions 19, 20 extending along the moving direction of the rolling pieces 15, 16, that is, extending along the moving direction of the flat die 10. is for forming an annular groove 22 in the workpiece 21. Each protrusion 1
9 and 20 protrude from the die surface 11 and have a triangular cross section with a predetermined apex angle α.
Each rolled piece 15, 16 has a die surface 24, 25 on one end thereof, and each die surface 24, 2
A plurality of teeth 26 and 27 for spline rolling processing parallel to the teeth 12 are formed on each of the teeth 5 . These teeth 26 and 27 are arranged on the die surface 1.
The protrusions 19 and 20 are continuous to the teeth 12 formed in the tooth 1.

Next, the effect will be explained. First, the lower groove 28 of the annular groove 22 is turned on the outer periphery of one end of the workpiece 21 using a lathe or the like. As shown in FIG. 6, the lower groove 28 has a first slope portion 29 having a predetermined angle β larger than the apex angle α of the protrusions 19, 20 on the outside thereof, and the tops of the protrusions 19, 20 on the inside thereof. and a second slope portion 30 having a predetermined angle γ smaller than the angle α. Note that the predetermined angle β and the predetermined angle γ are
corresponds to each opening angle mentioned in the claims. Next, the drive mechanism is started to move one flat die 10 in the direction of arrow y, and move the other flat die 10 in the direction of arrow y.
are moved in the opposite direction in synchronization with each other, and the workpiece 21 in which the lower groove 28 is formed between these flat dies 10 is moved between the lower groove 28 and the protrusion 1.
9 and 20 are placed on a straight line. As a result, the workpiece 21 rotates around its axis as the flat die 10 moves. By such rolling process, first, while the workpiece 21 is being rotated while being held between the A section of one die surface 11 and the A section of the other die surface 11, the workpiece 21 is rotated.
A shallow spline 31 is rolled on the outer peripheral surface of the annular groove 22, and the protrusions 19 and 20 are engaged with the lower groove 28 to form an annular groove 22. That is, as shown in FIG. 7, the material 32 at the intersection of the first slope part 29 and the second slope part 30 is pressed by the protrusions 19, 20 and moves into the gaps 33, 34, A vertical surface 35 is formed on the slope portion 30, forming an annular groove 22 shown in FIG.
At this time, a part of the material 32 at the intersection is part of the workpiece 21.
It swells in the outer circumferential direction and becomes a burr on the spline 31 side. Next, the workpiece 21 is placed on the pair of die surfaces 1
The spline 31 becomes slightly deeper while being rotated while being held in the middle part of the spline 31. Then, the burrs generated on the spline 31 side disappear. However, at this time, excess material from when the spline 31 is rolled enters the annular groove 22 in the form of burrs. This burr is pressed by the protrusions 19 and 20 while the workpiece 21 is rotated while being held between the B section of one die surface 11 and the B section of the other die surface 11, and the gap 3
3, 34, etc., and finishing is performed to form a predetermined spline 31 and annular groove 22 at the same time. As described above, since the lower groove 28 is first turned, the protrusions 19 and 20 are used for finishing because the protrusions 19 have good bite.

Note that the protrusion formed on the die surface of the flat die may extend over the entire length of the die surface in the moving direction. In this case, a recess having an opening width of the protrusion may be formed on the die surface in the flat die, and the protrusion may be inserted and fixed into this recess. Furthermore, this protrusion may be provided only on one of the paired dies. Further, the protrusions can also be provided on a round die.

As explained above, according to the rolling device of the present invention, each die surface has a plurality of teeth for rolling, a workpiece is held between a pair of dies, and the die is In a rolling device that forms a tooth profile on the outer periphery of a workpiece by relative movement, a die surface of at least one of the paired dies protrudes from the die surface and extends in the movement direction; A protrusion having a triangular cross section and a predetermined apex angle is provided, and the apex angle corresponds to the opening of the first slope portion of the lower groove that is previously formed on the outer periphery of one end of the workpiece prior to forming the annular groove. smaller than the angle, the second of the lower groove
The protrusion is engaged with the lower groove to form an annular groove on the outer periphery of one end of the workpiece, and at the same time, the groove is extended in the axial direction on the outer periphery by the teeth on the die surface. Because the groove is provided, it is possible to simultaneously roll a tooth profile such as a spline or serration and an annular groove, and it also has the effect of eliminating the need for a deburring process after forming the annular groove or tooth profile. .

[Brief explanation of drawings]

FIG. 1 is a schematic front view showing a conventional rolling device, FIG. 2 is a front view showing an embodiment of a rolling die according to the present invention, FIG. 3 is a view taken in the direction of FIG. 2, and FIG. The figure is a side view of FIG. 3, FIG. 5 is an enlarged view of one end of a workpiece processed by an embodiment of the rolling device according to the present invention, and FIG. 6 is an embodiment of the rolling device according to the present invention. FIG. 7 is an enlarged sectional view of a lower groove formed in one end of a workpiece before being processed; FIG. 7 is an enlarged sectional view illustrating a state in which a protrusion is engaged with the lower groove of FIG. 6; . 11...Dice face, 12...Teeth, 19,20...
... protrusion, 21 ... annular groove, 27 ... workpiece.

Claims (1)

[Claims] 1 Each die surface has multiple teeth for rolling processing,
In a rolling device that sandwiches a workpiece between a pair of dies and forms a tooth profile on the outer periphery of the workpiece by moving the dies relative to each other, a die surface of at least one of the pair of dies. protruding from the die surface and extending in the direction of movement;
A protrusion having a triangular cross section and a predetermined apex angle is provided, and the apex angle is equal to the first of the lower grooves that are preformed on the outer periphery of one end of the workpiece prior to forming the annular groove.
The opening angle is smaller than the opening angle of the slope portion and larger than the opening angle of the second slope portion of the lower groove, and the protrusion is engaged with the lower groove to form an annular groove on the outer periphery of one end of the workpiece, while at the same time A rolling device characterized in that a groove extending in the axial direction is formed on the outer periphery by teeth on the die surface.