JPH0211949Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention relates to the structure of a flat cutter for a rolling machine that rolls splines, serrations, etc. on the outer periphery of a workpiece made of pipe material or a solid shaft. be.

(Prior Art) There was something described in the specification and drawings of Utility Application No. 1983-90725 filed by the applicant of the present application.

That is, as shown in FIG. 5, one side of the main body 1 formed in a prismatic shape in the longitudinal direction is raised stepwise around the diagonal line L of the main body 1, thereby forming a blade stand 2 having a substantially triangular shape in plan view. , and a large number of linear finishing blades 3 extending in the short (width) direction of the main body 1 are formed on the blade base 2.
A flat cutter A was obtained in which the end 3c of the finishing blade 3 on the diagonal line L side was chamfered along the diagonal line L as shown in FIGS. 6 to 8.

(Problem to be solved by the invention) The above conventional cutter has a flat cutter A with a finishing blade of 3.
By rolling the workpiece by moving it from the short width part 3a side to the long width part 3b direction, as the flat cutter A advances, the end 3c on the diagonal line L side of the finishing blade 3 moves against the workpiece. The machine moves gradually in the axial direction, and the workpieces are sequentially machined in the axial direction.

As a result, the pressing force of the finishing blade on the workpiece is reduced, and even if the workpiece is a pipe material, it will not deform in the axial direction during machining, making it possible to roll with high precision and quickly. be effective.

However, since the flat cutter A has the diagonal L side end 3c of the finishing blade 3 chamfered along the diagonal L, as shown in FIG. It is also inclined at an angle α with respect to the traveling direction (A).

For this reason, during rolling processing, each of the ridges 3d processes the workpiece while displacing in the axial direction, and this section causes a cutting phenomenon, causing the machining surface of the workpiece, for example, the side surface of a spline tooth, to be machined. There was a drawback that some scars were generated.

The object of the present invention is to obtain a new flat cutter structure that eliminates the above-mentioned drawbacks.

(Means for Solving the Problems) In order to achieve the above object, the present invention has one surface in the longitudinal direction of the main body formed in a prismatic shape raised in a stepped manner around the diagonal line of the main body. A flat cutter for a rolling machine, which has a substantially triangular blade base in plan view, and a number of strip-shaped finishing blades extending in the transverse direction of the main body are formed on the blade base, each of the finishing blades The ridge of the diagonal side end is formed parallel to the long side of the main body.

(Function) Since the present invention is configured as described above, the ridge at the diagonal side end of each finishing blade extends in a direction perpendicular to the axis of the workpiece.

Therefore, each of the above-mentioned edges will not be displaced in the axial direction during processing.

(Example) Hereinafter, an example of the present invention will be described based on the drawings.

First of all, in the drawings, Fig. 1 is a perspective view of the flat cutter according to the present invention, Fig. 2 is a plan view of the main part thereof, and Fig. 3 is a perspective view of the flat cutter according to the present invention.
The figure is a cross-sectional view taken from FIG. 2, and FIG. 4 is a perspective view of FIG. 2.

In FIG. 1, reference numerals 5 and 5 denote a pair of upper and lower flat cutters having the same shape.To explain the lower flat cutter as a representative, the upper surface of the main body 6 formed in a prismatic shape is By notching the other surface in a step-like manner with respect to a line parallel to the diagonal line L, one surface is formed into a blade base 6a having an upwardly raised substantially triangular shape in plan view.

Then, a finishing blade 7 consisting of a large number of uneven stripes is formed on the entire surface of the blade stand 6a.

That is, as shown in FIGS. 1 to 4, the blade rest 6a
Extends in the width direction from the end 7a located on the recessed notch 6b side toward the other end 7b, and extends approximately 1 to 2 times with respect to the horizontal line toward the other end 7b.
A finishing blade 7 having a lateral clearance angle β inclined downwardly is formed.

Further, the end portion 7a of each finishing blade 7 is chamfered so that each edge 7c is parallel to the long side 6c of the main body 6. This ridge 7c is formed by, for example, providing a disk-shaped grindstone with a width corresponding to the tooth pressure of one finishing blade 7, and rotating this grindstone around an axis parallel to the long side 6c of the main body 6. , each of the above end portions 7a
This is done by chamfering each piece.

Next, the manner of use of the above embodiment will be explained.

As shown in Fig. 1, a pair of flat cutters 5, 5
The finishing blades 7, 7 are arranged facing each other on the short width parts 7c, 7c side, and the workpiece 4 made of pipe material is placed between each finishing blade 7, 7 in the longitudinal direction of each flat cutter 5, 5, that is, the arrow Place it in a direction perpendicular to the A and A directions.

Next, each of the flat cutters 5, 5 is operated in the approaching direction (in the direction of arrows A and I).

First, the short width part 7c of each blade 7, 7,
7c applies pressure to the axial end of the workpiece 4 to process this part, and then as each flat cutter 5,5 advances in the direction of arrows A and A, the recessed notch 6 of each blade 7,7
The end portion 7a located on the b side gradually moves inward in the axial direction of the workpiece 4, and the workpiece 4 is sequentially processed in the axial direction at the end portion 7a.

In this case, the ridge 7c of each finishing blade 7 end 7a is
Since they extend perpendicularly to the axis of the workpiece 4, each edge 7c presses the workpiece 4 without being displaced in the axial direction during machining.

Further, since each of the finishing blades 7 has a lateral relief angle β in the width direction, processing of the workpiece 4 is mainly performed by the end portion 7a on the side of the recessed notch portion 6a.

Since the rear portion 7a-1 of the end portion 7a is formed parallel to the long side 6c of the main body 6, the inner end of the workpiece 4 in the axial direction is at the same level due to the rear portion 7a-1. It will be processed.

(Effect of the invention) As is clear from the above explanation, in the present invention, each edge of the diagonal side end of the finishing blade is formed parallel to the long side of the main body, that is, the direction of movement, so that The pressing force acting on the workpiece can be reduced to prevent deformation of the workpiece, and the machined surface of the workpiece can be formed to be smooth.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of the flat cutter according to the present invention, Fig. 2 is a plan view of the main part thereof, and Fig. 3 is the same as Fig. 2.
4 is a perspective view of FIG. 2, FIG. 5 is a side view of a flat cutter showing a conventional example, FIG. 6 is a plan view of the main part thereof, FIG. 7 is a cross-sectional view of FIG. 6, FIG. 8 is a perspective view of FIG. 6. 5: Flat cutter, 6: Main body, L: Diagonal, 6
a: Blade base, 6b: Concave notch, 6c: Long side of main body,
7: Finishing blade, 7a: Diagonal side end, 7c: Edge,
β: Lateral clearance angle.

Claims (1)

[Scope of utility model registration request] One side of the main body formed in a prismatic shape in the longitudinal direction is raised in a stepped manner around the diagonal of the main body to form a blade base which is approximately triangular in plan view. In a flat cutter for a rolling machine formed with a large number of finishing blades extending in the shape of a strip, each of the finishing blades has a ridge at its diagonal side end parallel to the long side of the main body. Features a flat cutter structure for rolling machines.