JPS6133670B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a machining head wheel which corresponds to a cutting tool during boring.

More specifically, a large number of concave portions and convex portions are formed in the circumferential direction, and the circumferential surface is formed with a tapered surface that expands backwards at the front and a straight surface at the rear parallel to the axial direction. This invention relates to a boring processing head wheel that achieves high-capacity machining by providing hard particles at least on the tapered surface, and allows rough machining to be performed by the tapered surface and finishing machining to be performed by the straight surface in one process.

When boring an internal hole in a workpiece, conventionally, a tool with multiple bits installed in the circumferential direction is used to first perform rough machining, and then a rotating head with multilayer abrasive grains attached to the circumferential surface is used to drill into the internal hole. Finishing work was done by revolving the According to this machining method, chatter occurs during rough machining due to the long tooth gap between the cutting tools, and during finishing machining, the head and the inner diameter hole of the workpiece are in line contact, resulting in a reduction in machining amount. It was small and did not have a large processing capacity. In particular, the above-mentioned finishing abrasive grains become clogged, and this is noticeable when the material of the workpiece is a soft metal such as aluminum.
This resulted in a decrease in workability.

In addition, in the above processing method, finishing processing must be performed as a separate operation after rough processing, which increases the number of steps and operation time, making it impossible to improve workability.

In view of the above-mentioned conventional problems, the present inventors have created the present invention in order to effectively solve the problems.

An object of the present invention is to use a machining head with a large number of concave and convex portions formed in the circumferential direction like a gear, and to perform boring processing of the inner diameter hole of the workpiece using the convex portions with hard particles such as diamonds provided on the surface of the machining head. This is done by cutting edge action, and by forming a large number of convex parts, the tooth gap is shortened to prevent chatter, and the large number of convex parts improves boring processing ability.
Another object of the present invention is to provide a boring machining head wheel that allows chips generated during machining to be discharged from the recessed portion and eliminates clogging even when machining soft metals.

It is also an object of the present invention to have a peripheral surface of the machining head on which the recesses and projections are formed, a tapered surface at the front that expands backwards, and a diameter that is the same as the outer diameter of the rear end of the tapered surface.
It is formed by a straight surface parallel to the axial direction, rough machining is performed by the tapered surface provided with hard particles, finishing machining is performed by the straight surface, and rough machining and finishing machining are performed continuously by the thrust movement of the rotating machining head. It is an object of the present invention to provide a processing head wheel for boring, which can be carried out by reducing the number of steps, improving processing ability in combination with the cutting edge action of a large number of convex portions, and improving operational efficiency.

A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

Reference numeral 1 designates a processing head wheel exhibiting an annular body according to the present invention, and the processing head wheel 1 is attached to the boring bar 2 by being coupled with a key 3 to a boring bar 2 inserted into an axial through hole 1a. As shown in FIGS. 2 and 3, the wheel 1 has a large number of recesses 4 and projections 5 alternately formed in the circumferential direction, and these recesses 4 and projections 5 formed at equal pitches create a The wheel 1 is gear-shaped. As shown in FIG. 1, the circumferential surface 1b of the wheel 1, that is, the surface of the convex portion 5, is composed of a tapered surface 6 at the front in the boring direction and a straight surface 7 at the rear in the boring direction, and the tapered surface 6 is expanded rearward. The diameter of the rear end of the tapered surface 6 is continuous in the axial direction of the straight surface 7, and is parallel to the axis of the inner diameter hole Wa of the workpiece W.

Hard particles 8 such as diamonds or abrasive grains that match the material of the workpiece are fixed to the surface of the convex portion 5 on the circumferential surface of the wheel, and the hard particles 8 are arranged in the axial direction to form a tapered surface 6 and a straight surface 7. In the illustrated example, the hard particles 8 are arranged in a single row. This hard particle 8 provided for each convex portion 5... is the fourth
As shown in the figure, it is preferable to arrange the hard particles 8 at regular intervals and to shift them in the axial direction with respect to the hard particles 8 of the adjacent convex portions 5.

For example, in order to provide the hard particles 8 on the convex portion 5,
Markings are made at regular intervals, abrasive grains, etc. are temporarily implanted thereon, and then fixed by electroplating means.

When the machining head wheel 1 is rotated and thrust moved by the rotational thrust of the boring bar 2, the inner diameter hole Wa of the workpiece W is first bored by the hard particles 8 on the tapered surface 6, and as the wheel 1 is thrust moved, the inner diameter hole Wa of the work W is first bored. Then, the diameter of the inner diameter hole Wa is enlarged according to the inclination angle of the tapered surface, thereby completing rough machining. The portion of the inner diameter hole Wa through which the tapered surface 6 has passed is subsequently ground by hard particles 8 on the straight surface 7 and finished to a predetermined diameter. As a result, even for a long-axis workpiece, rough machining and finishing machining can be performed continuously by one pass operation of the wheel 1.

In the above boring process, a large number of protrusions 5... are formed on the wheel 1, and since the intervals between these protrusions as cutting edges are short, no chattering phenomenon occurs, and the large number of protrusions 5... As a result, processing ability is improved and workability is improved. Further, chips generated during cutting of the workpiece W are discharged from the recesses 4, and will not become clogged even if the workpiece is made of a soft metal such as aluminum.

FIG. 5 is a graph of the results of a precision boring machining experiment comparing the amount of chips discharged per unit time between the machining head wheel according to the present invention and a conventional head using a cutting tool, where line A is for the present invention and line B is This is the conventional case. The workpiece is an aluminum material with an inner diameter hole size of 50 mm. As shown in this graph, conventionally
^155cm2 of chips are cut and discharged from the workpiece.
Whereas it used to take 60 seconds, with the present invention, the same amount of chips can be removed in 20 seconds, reducing the work time by one-third. In other words, the machining capacity has been improved three times, machinability and workability have increased, and the chips discharged in a short time can be reliably removed from the recesses as described above.

6 to 9 show embodiments of the present invention.

In the embodiment shown in FIG. 6, the hard particles 8a on the tapered surface 6
In contrast, while using the same size hard particles 8b of Straight Mesh 7, this hard particle 8b
The protrusion amount h of each hard particle 8b from the straight surface 7 was made equal by tooling.

This makes the hard particles 8b suitable for finishing.

In the embodiment shown in FIG. 7, the hard particles 8c on the tapered surface 6
The hard particles 8d on the straight surface 7 were made smaller and used for finishing processing.

In the embodiment shown in FIG. 8, hard particles 8e are provided only on the tapered surface 6, leaving the straight surface 7 as a smooth surface. In this embodiment, finishing machining is performed using a precision machining tool 10 of a cartridge 9 attached to the boring bar 2 as shown in FIG.

As is clear from the above explanation, according to the present invention, it is possible to eliminate the chatter phenomenon during boring, the chips are reliably discharged and no clogging occurs, and high-capacity machining can be achieved and workability is improved. It is possible to carry out rough machining and finishing machining continuously by passing the machining head wheel through, and the work process can be done only once, reducing the work time.This greatly contributes to this type of boring machining. be.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view of the machining head wheel showing the workpiece machining state with imaginary lines, Figure 2 is a front view of this wheel, Figure 3 is a partially enlarged view of Figure 2, and Figure 4 is a diagram of hard particles. 5 is a graph comparing the amount of chips discharged per unit time between the present invention and the conventional method; FIG. 6 is a diagram of the first embodiment; FIG. 7 is a diagram of the second embodiment; FIG. 9 are diagrams of the third embodiment. In the drawing, 1 is a processing head wheel, 1b is a peripheral surface, 2 is a boring bar, 4 is a recessed part, 5 is a convex part, 6 is a tapered surface, 7 is a straight surface, 8, 8a
~8e is a hard particle, and 10 is a bite.

Claims (1)

[Scope of Claims] 1. An annular body having an axial through-hole that can be freely connected to a boring bar is provided, and a concave portion and a convex portion that directly extend in the axial direction are provided on the outer periphery of the annular body in the circumferential direction. A plurality of the convex portions are alternately formed, and the circumferential surface of each of the convex portions is formed into a rearward expanding tapered surface for rough machining of the front portion;
A boring machine comprising a straight surface for finishing continuous with the rear end of the tapered surface and parallel to the axial direction, and hard particles such as diamonds are arranged in a line in the axial direction on at least each of the tapered surfaces. Machining head wheel. 2. Claim 1, characterized in that hard particles are provided on the straight surface in the same way as on the tapered surface, and the amount of protrusion of the hard particles from the straight surface is made uniform.
Boring processing head wheel as described in section. 3. The boring head wheel according to claim 1, wherein hard particles are provided on the straight surface in the same manner as on the tapered surface, and the hard particles are smaller than the hard particles on the tapered surface. 4. The boring processing head wheel according to claim 1, wherein hard particles are provided only on the tapered surface, and finishing processing is performed using a cutting tool provided with a boring bar.