JPH0442027Y2 - - Google Patents

Description

[Detailed explanation of the idea] (Industrial application field) This invention relates to a rolling tool.

(Prior art) In conventional rolling forming such as spline and serration, a workpiece 5 is rotatably supported at both ends by a center 7 as shown in FIG. The flattening dies 1 and 2 are moved parallel to each other in opposite directions only once.

Conventionally, the rolling tool was moved only once to perform rolling, which resulted in a large forming load, and the column of the rolling machine that supported the flat rolling die also needed to be strong, which allowed the forming load to be distributed. In order to do this, the rolled flat die also becomes larger. Further, in order to process a spline of a certain length, it is necessary to make the width of the flat rolling die larger than the length of the spline.

(Problems to be solved by this invention) The object of this invention is to provide a rolling tool that has a small forming load, does not have a sturdy rolling machine, and has a flat die whose width is smaller than the length of the tooth profile to be machined. .

(Means for Solving the Problems) In order to solve the above problems, the rolling tool of this invention is a rolling tool that forms a tooth profile in which the tooth trace extends in a straight line on the surface of the workpiece. The width of the tool in the linear direction is smaller than the width of the tooth profile to be formed, and the workpiece pressing surface of the rolling tool has a portion where the height of the teeth is high at approximately the center of the width and low at both ends. It has a configuration in which a plurality of arcuate blades are formed in parallel rows at a constant pitch in a direction perpendicular to the width of the blade.

(Function) When using the rolling tool with the above configuration, the workpiece is pushed between the opposing workpiece pressing surfaces of the rolling tool and moved parallel to the partially arcuate parallel blades. The workpiece is in approximately point contact with the top of the parallel blade, and the top forms a tooth profile such as a spline. When one of the opposing rolling tools is translated upward and the other downward, the workpiece is rotated about its axis. The desired tooth profile is then rolled by repeating the same process. Here, the pressing load of the rolling tool can be smaller than in the past, and the tool itself or the rolling device can be simplified.

(Description of Embodiment) This invention will be explained below with reference to FIGS. 1 to 3 showing one embodiment. Each blade 13 of the rolling flat die 11, 12
The planar shape of the tooth is such that the height of the teeth is high at approximately the center of the width, and the shape of a partial arc is low at both ends, with the apex 14 at the center. The blades 13 are formed parallel to the width B of the dies 11 and 12 at a constant pitch in a direction perpendicular to the width B, and are all of the same shape. The width B of the flat dies 11 and 12 is smaller than the length of the spline 6 to be machined on the surface of the cylindrical workpiece 5.

To perform spline processing on the workpiece 5, flat dies 11 and 12 are arranged opposite to each other with the workpiece 5 in between.
While pushing the workpiece 5 between the flat dies 11 and 12 from one end thereof along the rotation axis direction, the flat dies 11 and 12 are relatively reciprocated in directions parallel to each other in synchronization with the pushing to form the spline teeth. Form.

During the above processing, the top portion 14 of the blade 13 comes into contact with the workpiece 5 at approximately a point. Therefore, as shown in FIG. 3, material flows as indicated by arrows P and Q along the arcuate shapes of the flat dies 11 and 12, and the axis C of the workpiece 5 occurs.
The material also flows well in the direction of. The rolling force required for plastic working of the spline is reduced by the amount of material flow in the direction of the axis C of the workpiece 5. Conventionally, the flow in the direction of the axis C of the workpiece 5 indicated by the dotted line in Fig. 5 was not carried out well, and as a result, end face sag (insufficient bulge at both ends of the spline) occurred and a large rolling force was required. With this design, no edge sag occurs. Furthermore, in this embodiment, the flat die 11,
12 is symmetrical with respect to the center line _C1 , so the workpiece 5 can be pushed in from either direction and reciprocating processing is also possible.

(Effects of the invention) Since this invention has the above configuration, it has the following excellent effects.

(a) Since the tooth profile is machined by pushing the workpiece between the rolling tools, the machining is easy and the machining accuracy is good, and the width of the rolling tool can be shorter than the length of the tooth profile to be machined, making it compact.

(b) During machining, the workpiece is pressed into almost point contact with the top of the blade 13, so the material flows along the arc shape of the rolling tool, and the rolling force required for plastic working is small. It's over.

[Brief explanation of the drawing]

FIG. 1 shows a perspective view of one embodiment. FIG. 2 shows a plan view of a processing state according to one embodiment. FIG. 3 shows a detailed view of section A in FIG. 2. FIG. 4 shows a perspective view of spline processing using a conventional flat rolling die. FIG. 5 shows a plan view of spline processing using a conventional flat rolling die. 5... Workpiece, 11, 12... Rolling flat die, 13... Blade, 14... Top.

Claims (1)

[Claims for Utility Model Registration] A rolling tool for forming a tooth profile with tooth traces extending in a straight line on the surface of a workpiece, the width of the rolling tool in the linear direction being smaller than the width of the tooth profile to be formed. , and the workpiece pressing surface of the rolling tool has a plurality of partial arc-shaped blades whose teeth are high at approximately the center of the width and low at both ends at a constant pitch in a direction perpendicular to the width. A rolling tool characterized by being formed in parallel rows.