JPS624566A - Workrest for cutting tool grinding - Google Patents

Abstract

PURPOSE:To obtain the workrest of long life by performing electric discharge machining or laser beam machining to the center of a cylindrical cemented carbide material made of ceramics, diamond, or CBN sintered body forming a through hole, lapping the inner surface of the hole, and dividing the material in the direction of a plane separating minute length from the axis of the hole. CONSTITUTION:Surface grinding is performed to the upper and lower faces 18a and 18b of a cylindrical cemented carbide material 18 made of ceramics, diamond, or CBN sintered body, and then cylindrical grinding to the peripheral surface 18c. And a through hole 19 is formed at the central part of the ceramics material 18 by electric discharge machining or laser beam machining, and the inner surface of the through hole 19 is lapped. In the next step, the cemented carbide material 18 is divided in the direction of an imaginary plane including the axis 19a of the through hole 19 or an imaginary plane 20 separating minute length (a) from and parallel with the axis 19a, and an unnecessary part is removed. And finish flat surface machining is performed to the face 21 formed by dividing completing a workrest. The life of a workrest can, therefore, be further prolonged by forming the groove section 19 out of ceramics hard to be worn in comparison with conventional workrests.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a work rest used to support a cutting tool such as a miniature drill or an end mill during grinding.

[Prior art]

FIGS. 6A, 6B, and 6C are a plan view, a front view, and a side view, respectively, showing the structure of a conventional work rest and its mounting base. Among these, reference numeral 1 denotes a work rest made of carbide, on the top surface of which a groove 2 with a semicircular line cross section is formed, and the work rest mounting base 3 is brazed, organic adhesive or mechanical clamped. installed by.

The bottom surface I/c of the work rest mounting base 3 has screw holes 3a, 3a
is formed, and is fixed to the device base of the three companies by a pheasant.

When grinding a cutting tool such as a miniature drill or an end mill, as shown in FIG. (Work-less while rotating/moving work 4 by rotating or moving .)
Grind the workpiece 4 using a grinding wheel from above l.

[Problem that the invention seeks to solve]

In the grinding process using the work rest 1 described above, wear of the stile and the work rest 1 occurs. That is, first, when defining the dimensions of the workpiece 40 before processing the workpiece 4, the workpiece 4 is rotated or moved on the workpiece rest (l), but at this time, the workpiece rest 1 is worn out. Furthermore, during the processing of the workpiece 4, the workpiece 4 is ground while being rotated on the workpiece rest 1, but in this case,
When the ground portion of the work 4 is rubbed against the work rest IK, further wear of the work rest I occurs.

This is especially noticeable when processing the tip of the workpiece 4. As described above, when the work rest 1Kjl wears out, the machining dimensions of the work 4 change, causing product defects, so the conventional work rest 1 had to be replaced frequently.

This invention was made in view of the above circumstances, and its purpose is to provide a work rest with a long life.

[Means for solving problems]

According to the present invention, a groove portion having a semicircular cross section is formed on the upper surface of a pull-shaped material made of workrest ore, ceramics, diamond sintered body, or CBN sintered body.

〔Example〕

Figures (a), (b), and V are respectively a plan view, a front view, and a side view of a workless workpiece 11 according to an embodiment of the present invention. In these Im, semi-cylindrical work rest 1ift ceramics, diamond sintered body or uc
It is formed of a BN (cubic boron nitride) sintered body, and the center mrt of the plane 11s11a of the workless) 11
c19 T-face cow circular f) Groove 812 is formed. The work rest 11 is attached to the work rest mount 13 by adhesive or mechanical clamp.

Since the work rest 11 having the above structure is made of ceramic, diamond sintered body, or CBN sintered body, wear of the groove portion 12 is much less than that of the conventional work rest made of only K carbide. , therefore,
Its lifespan is greatly improved. For example, the life expectancy of a metal alloy using ceramics is about Sθ times or more, and when a diamond sintered body or a CBN sintered body is used, it is about 790 times or more.

In addition, the material type of the ceramic in the above example is pure A.
M containing dlOs%TiC, 01, M containing ZrO,
03, '1' M containing both iC and ZrO, 03,
8i containing Si, N4, -〇, S containing N4, MgO
i, to.

Or 5jlN4, etc., containing both Y, O, and Zr01. Alternatively, the work rest 11 and the work rest mounting base 13 may be formed integrally. Alternatively, the groove portion 12 may be formed using a profile grinder or the like as in the conventional manner, or may be formed by drilling and cutting as described later.

FIG. 2 shows an example of the shape of the miniature drill, and FIG. 3 shows the use fl' of the workless (11) when grinding the miniature drill shown in FIG.

Mana, Figure 1 Kml! An example of the 512Q shape is shown.

When grinding a tapered miniature drill, also taper the groove G12 as shown in this figure.

Next, referring to FIG. S, the work rest 11cv in FIG.
@i method will be explained.

(2) First, the upper and lower surfaces 18a and 18b of the cylindrical ceramic material 18 shown in FIG. 5(a)K are ground.

■ Next, the ceramic fi material 18 shown in Figure S (opening)
The cylindrical grinding of aspect 18c is performed.

(2) Next, as shown in %f4s diagram (c), a through hole 19 is formed in the center of the ceramic material J8 by 1sK electrical discharge machining or laser machining, and then the inner surface of the through hole 19 is lapped.

■ Next, as shown in Fig. S), the carbide material 18 is divided on an imaginary plane 20&c that includes the axis of the through hole 19 or parallel to the axis 1119a and is a minute distance away from the axis 1119a. and remove unnecessary parts (hatched parts). In this case, the division is carried out by grinding, electric discharge or laser.

Note that the dimension a in the figure is the cutting allowance, for example, Q00! r
NQjws.

(2) Next, the semi-cylindrical weight surface 21 (see FIG. S (e)) of the carbide material formed by the above process is finished and flattened. In this way, the work rest 11 is completed.

Incidentally, after the completion of the above step (2), surface grinding of the upper and lower surfaces 18a and 18b may be performed in order to remove the expansion of both ends of the green through-hole 19 by lapping.

In addition, for lapping of large diameter through-holes having a diameter of a diameter of a diameter or more, internal grinding may be performed. Further, the material 18 may be divided on a virtual plane including the axis 19a of the through hole 19 according to the above process (2).

〔Effect of the invention〕

As explained above, the work rest according to the present invention has the advantage of having a much longer life than the conventional work rest. As a result, the time required to replace the work rest becomes longer, and therefore the replacement work can be streamlined.
Furthermore, the manufacturing cost of the work rest per potential period is also dramatically reduced.

[Brief explanation of drawings]

1) to (c), respectively, a plan view, a front view, and a side view of the work rest 11 according to an embodiment of the present invention;
The figure shows an example of the shape of a miniature drill 154, IJ
gJ Figure c4~(c) is a diagram showing an example of the use of the work rest when grinding a miniature drill, Figure v(a),
(b) is a side view and a front view showing an example of a tapered work rest, respectively, and Figs.
FIG. 6 shows a plan view, a front view, and a side view of a conventional work rest 1. FIG. 4... Miniature bird y, 11... Work rest, 12... Groove.

Claims (1)

[Claims] A work rest for grinding a cutting tool, which is formed by forming a groove with a semicircular cross section on the top surface of a block-shaped material made of ceramics, diamond sintered body, or CBN (cubic boron nitride) sintered body.