JP2983050B2 - Processing long workpieces - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a technology for cutting a long workpiece such as a camshaft.

(Prior Art) FIG. 3 is a diagram of a camshaft. A camshaft 100 (hereinafter, referred to as a “workpiece 100”) built in an engine of a vehicle is located at a position sufficiently centered from an end face 101 thereof. Is formed with an oil groove 102.

FIG. 4 is a view showing a conventional method of processing a work, in which an oil groove 102 of a work 100 is cut by a forming tool 103 conforming to its profile.

On the other hand, since the work 100 is supported by the center holes 100a and 100b at both ends, when a horizontal force (arrow) acts on the center of the mold bit 103 near the center, the work 100 bends, so-called chatter phenomenon occurs, and good cutting cannot be performed. .

Therefore, as shown in the figure, the technique of arranging the rest member 104 on the opposite side and receiving the workpiece 100 with the rest member 104 is a feature of the processing technique of the long workpiece.

(Problems to be Solved by the Invention) However, when the rest member 104 is strongly brought into contact with the work 100, the work 100 is bent in the opposite direction, and when the rest member is too weak, the effect is reduced. difficult.

Then, an object of the present invention is to provide a processing method which enables cutting of a long work without using a rest member.

(Means and Actions for Solving the Problems) With respect to the intersection between the axis of the workpiece and the machining center line orthogonal to the workpiece, the workpiece is placed at a point symmetric position and at a position where the cutting edge does not overlap the machining center line. A pair of cutting tools are arranged on both sides.
Next, cutting is performed by moving these cutting tools in a direction opposite to each other along the axial direction of the workpiece (Example) An example of the method of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a layout view of a cutting tool according to the present invention, and shows a work 1
The cutting tool is symmetrical with respect to the point of intersection 5 of the axis 2 of
6. Place 6 and 7 on both sides of Work 1. In addition, the cutting edge 6 of the cutting tools 6 and 7
a and 7b are retracted from the processing center line 3 and are positions (initial positions) that do not overlap with the processing center line 3.

2 (a) to 2 (c) are explanatory views of the processing method of the present invention. The work 1 is rotated at a rate of 100 revolutions per minute,
6,7 is fed by NC machine at the rate of 0.1mm per work rotation.

In FIG. 2 (a), the cutting tools 6, 7 are fed in the directions indicated by the arrows (in the direction of the processing center line), and cutting is started. At this time, the pressing forces (arrows, directions) of the cutting tools 6, 7 are offset.

In FIG. 2 (b), the cutting tools 6, 7 are also fed in opposite directions (arrows, directions, ie, directions parallel to the axis of the work). At this time, the thrust force (arrow, direction) in the feed direction of the cutting tools 6, 7 is canceled.

In FIG. 2 (c), the oil groove 4 is cut and formed, and the cutting tool is formed.
6,7 evacuate outside. The A portion of the oil groove 4 is cut by the cutting tool 6 and the B portion is cut by the cutting tool 7.

As shown in FIG. 2 (a), since the cutting edges 6a and 7a of the cutting tools 6 and 7 are retreated by α from the machining center line 3, it is difficult to leave an unmachined convex portion at the bottom of the valley of the oil groove 4. There is no.

The processing method of the present invention using a pair of blades arranged point-symmetrically is not limited to oil groove processing of a camshaft, and may be widely applied to cutting of a long work.

(Effects of the Invention) As described above, according to the method of the present invention, cutting can be performed in the vicinity of the center of a long workpiece without a rest member, and good processing can be performed without causing harmful bending of the workpiece. I can do it.

[Brief description of the drawings]

FIG. 1 is a layout view of a cutting tool according to the present invention, and FIGS.
(C) is an explanatory view of the processing method of the present invention, FIG. 3 is a view of a camshaft, and FIG. 4 is a view showing a conventional processing method of a work. 1 Workpiece 2 Axis line 3 Processing center line 5
Intersection points 6, 7, ... cutting tools.

Claims (1)

(57) [Claims] In a machining method for performing a cutting process at a position closer to the center from an end face of a long work, a point symmetry is made with respect to an intersection point between an axis of the work and a processing center line orthogonal to the axis. A pair of cutting tools are arranged on both sides of the work at a position where the cutting edge does not overlap the processing center line, and the cutting work is performed by moving these cutting tools in a direction opposite to each other along the axial direction of the work. A method for processing long workpieces, characterized in that: