JPS63123604A - Method of machine with broach - Google Patents

Abstract

PURPOSE:To make a chip pocket smaller and reduce at cutting resistance by making both a broach and a work rotate relative to each other, thereby making cutting chips in a spiral shape to reduce the diameter of cutting chip curls and reducing clogging with the cutting chips. CONSTITUTION:A broach 1 while being passed through a work 3 and being drawn with a drawing device 11 is rotated with a rotation device 9 arranged on the drawing device 11. By the effect of this rotation, a cutting edge 2 is to perform an oblique cutting, a cutting chip 4' flows out at a certain angle to the direction perpendicular to the cutting edge, the diameter of the cutting chip curl remains small and moreover a cutting resistance decreases. As a method of rotating the broach 1, the broach 1 can be naturally rotated, rather than forcibly, by making the cutting edge 2 of the broach 1 tilted relative to the axial direction 12, thereby producing a force 15 in the circumferential direction.

Description

[Detailed description of the invention] <Public funds for industrial use> The present invention relates to a processing method using a broach.

<Conventional technology> Broaching is a process in which a broach consisting of a large number of rough cutting blades to finishing cutting blades is pulled out or punched out relative to the workpiece to shape the workpiece into the desired shape. This is a processing method that involves forming and cutting.

FIG. 4 shows the state during processing in the conventional processing method using a broach. The nth blade 6 and (n +
1) A No. 7 blade is formed, and by interlocking the broach main body 1 with respect to the workpiece 3 in the cutting direction shown by the arrow 8, the number machined by the cutting blade immediately before the i No. 6 blade 6 is removed. is scraped off by the n-th blade 6 as chips 4 by the cutting depth. Furthermore, chips 4 are similarly formed by the (n + 1) number blade 7.

In this way, the cutting blades sequentially act on the workpiece 3 of limited thickness to obtain a predetermined shape.

Furthermore, with regard to broaching, the chip evacuation mechanism has not been sufficiently analyzed, and the merits of rotating the broach have not been studied.

<Problem to be solved by the invention> In broaching, the periphery of the broach is restrained during machining, so the chips generated during the -th machining are curled and stored in the chip pocket without disturbing the chips. There is a need. However, as shown in FIG. 4, the chips 4 that are formed have a small chip curl diameter at the beginning, but as the machining progresses, the chips 4 wrap around each other and gradually grow larger. Therefore, it is necessary to make the chip pocket 5 sufficiently large.
The interval between the cutting edges 2 becomes longer, the length of the entire broach becomes longer, and the tool cost increases. In addition, in broaching, a land portion 17 is provided at the tip of the cutting edge 2 to improve tool stability, which causes the problem of higher machining force than other machining methods9, reducing cutting resistance. is also an important point.

Means for Solving the Problems> In order to solve the above problems, the broach and the workpiece are machined while being rotated relative to each other.

Effect> By applying rotational motion to the broach, chips are formed in a spiral shape and the chip curl diameter is kept small. Further, the cutting edge becomes oblique cutting, and the actual cutting edge angle becomes smaller, reducing cutting resistance.

Embodiment FIG. 1 shows a situation in which a round broach is rotated and processed as an embodiment of the present invention.

Figure 2 shows the situation around the cutting edge during machining.

As shown in the figure, a broach 1 is passed through a workpiece 3 and pulled out by a drawing device 11, and at the same time, the broach is rotated by a rotating device 9 provided in the drawing device 11. Due to the effect of rotation, the cutting edge 2 cuts at an angle, and the chips 4' flow out at a certain angle with respect to the vertical direction of the cutting blade, so that the chip curl diameter remains small and cutting resistance can also be reduced. In the figure, 10 is the rotating direction of the broach 1, and 12 is the pulling direction of the broach 1.

As a method of rotating the broach 1, in addition to the method of forcibly rotating the broach 1 with a rotating device 9 as shown in Fig. 1.2, the cutting edge 2 of the broach 1 is rotated in the axial direction as shown in Fig. 3. A possible method is to generate a force 15 in the circumferential direction by tilting it with respect to 12, thereby causing it to rotate naturally. Third
In the figure, 14 is the load applied to the cutting edge 2, 15 is the circumferential component force thereof, and 16 is the axial component force.

Also, instead of rotating the broach 1, the workpiece 3
You can get the same effect by rotating the .

<Effects of the Invention> In broaching, the present invention makes it possible to reduce the chip curl diameter, reduce chip clogging, and make the chip pocket smaller by rotating the broach and the workpiece relative to each other. Furthermore, chip resistance can be reduced.

[Brief explanation of the drawing]

Figure 1 is a schematic diagram of rotating a broach as an example of the present invention, Figure 2 is an explanatory diagram of chips generated by the method of the present invention, and Figure 3 is an example of rotating a broach with an inclined cutting edge. FIG. 4 is an explanatory diagram of the effect of force in this case, and FIG. 4 is an explanatory diagram of conventional broaching. In the drawings, 1 is a broach main body, 2 is a cutting blade, 3 is a workpiece, 4.4' is a chip, 5 is a chip pocket, and 9 is a rotating device.

Claims (1)

[Claims] A machining method using a broach that is characterized by machining while rotating the broach and the workpiece relative to each other.