JPS61279454A - Twist drill grinding machine - Google Patents

Abstract

PURPOSE:To carry out the machining of a cutter edge for a drill and the thinning of a chisel edge on one chuck by causing a grinding wheel to give a semi- arc rotary motion at the edge of a drill and upward about an axis crossing the center of the drill. CONSTITUTION:Bearing parts 28a and 28b are provided at both lower sides of a grinding head 27 and geared with the bearing part of a vertical slider 9 via a fulcrum 29 for free rotation. Furthermore, the upper part of said head 27 is monolithically mounted with a motor 30 having a grinding wheel G on its drive shaft. Said head 27 is fitted with a lever 31 and the grinding wheel G is cause to give a semi-arc motion about the fulcrum 29 by the control of the lever 31, thereby enabling the proper positioning of the grinding wheel G at the cutting tool edge and the chisel edge thinning position.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a drill grinding machine equipped with a thinning device.

In general, about half of the thrust of the cutting force is concentrated at the chisel edge at the tip of the drill during IJ/IJ work. Therefore, as shown in Fig. 1A and B, thinning Fl and F2 on the chisel edge E at the tip of the drill will reduce the tip. Improved chip evacuation, reduced thrust, and much longer drill life. In the drawings, AT and A2 are the groove portions of the drill, and B1 and B2 are the blade portions.

Therefore, the conventional thinning, which is of no use, is performed using a thinning device prepared separately from the drill grinding, making the work troublesome and expensive.

In view of the above points, the present invention aims to commercially provide a drill grinding machine that can perform not only drill grinding but also thinning.

In the present invention, for the grinding of drill blades, the
The device shown in No. 48268 is used. In the present invention, the grinding wheel shown in the device owned by the company is rotated in a semicircular arc upwards on the drill side so that the thinning of the chizeno 1/edge can be carried out within the desired range.
Drino V-blade grinding and thinning operations can be performed efficiently with one device.

Hereinafter, an example of implementing the present invention will be described based on the accompanying drawings.

Fig. 2 is a perspective view of the entire device, Fig. 3 is a front view seen from the C side of Fig. 1, Fig. 4 is a side view similarly seen from the D side, and Fig. 5
The figure is an exploded perspective view showing a sliding mechanism related to a polishing stone mounting table, and FIG. 6 is an explanatory view of the operation.

Reference numeral 1 denotes the main body of the device; 2 indicates a tip angle setting plate installed on one side of the main body 1 so as to be rotatable in an arbitrary range of angles in the horizontal direction; ,
At this time, the upper frame 2a is configured to be able to swing relative to the lower frame 2'b within a predetermined range of eccentricity.

3 is a spindle case, 4 is a chuck, 5 is a drill gripped by the chuck, and 6 is a spindle rotation handle, which is placed on the upper frame 2a, and one rotation of the spindle rotation handle 6 rotates the upper frame 2a. is shaken 20 times within a predetermined range of eccentricity relative to the lower frame 2b, thereby grinding the drill cutting edge (El, B2) in contact with the polishing wheel. The specific structure for this purpose is
As described in No. 8268.

Reference numeral 7 denotes a base that holds the polishing wheel at a constant height on the other side of the device main body 2, and on this base, the polishing wheel G is moved from side to side (-n (ul) or front and back through horizontal slider 8 and vertical slider 9 It is made slidable in the (/1 (=) direction.

Specifically, as shown in FIG. 5, a dovetail projection 10 is placed on the base 7.
In addition, a dovetail groove 11 is formed on the horizontal slider 8 to fit and engage the two, and a rack 12 is also installed on the front surface of the pedestal. A rack gear 13 is provided which meshes with the rack gear 13. In this case, 14 is a shaft bearing, 5 is a support shaft thereof, and 16 is a support shaft 15 for rotating the rack gear by appropriately operating the handle. The horizontal slider 8 moves left and right (
i (slides in the u) direction. A dovetail protrusion 17 is provided on the upper surface of the horizontal slider 8 to engage with the vertical slider 9. In addition to this, a female thread 19 is carved inward in a certain length range at the rear center of the projection 17 in parallel thereto.

On the other hand, the vertical slider 9 is provided with shaft bearings 20a and 20b on the front surface for supporting a grindstone mount, which will be described later.
Moreover, on the inner surface of the lower part, there is a dovetail groove 2 that fits with the above-mentioned dovetail groove protrusion 17.
1 is bored, and the rear part still has a male thread 23 at the tip in the length direction.A bracket plate 25 that rotatably supports the grip 24 is fixed using a set screw 26, and the above-mentioned In order to fit and engage the dovetail protrusion 17 on the upper surface of the horizontal sliter 8, the male thread 23 of the grip 24 and the female thread 19 provided on the dovetail protrusion 17 are screwed together. 24, the vertical slider 9 is slid in the direction C→).

Reference numeral 27 denotes a grindstone mount, and shaft bearings 28a are provided on both sides of the lower surface.
, 28b are provided, and are rotatably supported via a support shaft 29 in a state of engagement with the shaft bearing portion of the vertical sliter 9, and a motor 3 having a grinding wheel G attached to the drive shaft on the upper surface thereof.
0 is placed integrally. Here 81 is the grindstone stand 27
It is a lever provided at
As a result, the polishing wheel G is rotated in a semicircular arc in the direction of the arrow (S) about the support shaft 29.

(See FIG. 6) In the drawing, the grindstone covers 83 and 84 are screw rods for stoppers that regulate the tilting positions of the grindstone mount 27 in the front and rear directions.

Next, the effect will be explained. In the present invention, initially
For cutting edge grinding at t5 (8+, B2 in Figure 1),
As shown in Fig. 4, the grinding wheel G is held in the chuck 4 and the grinding wheel mount 27 is tilted forward, so that the rotational axis of the grinding wheel G is lower than the center line 0-○°. , that is, in the illustrated example, 0 is approximately 10°. In addition, the drill point angle setting table 2 is made by slightly loosening the clamp hand (VK) and rotating it appropriately according to the point angle so that the grinding surface (Bl or Bz) of the drill blade comes into contact with the grinding wheel G. In that state, clamp hand /l/K is tightened and fixed.

Then, the mogoo 30 is driven to move the polishing wheel G to the arrow C.
) direction, and also rotates the spindle rotating hand/I/6 appropriately to grind the drill cutting edge surface (B+, B2). At this time, the condition in which the grinding is performed with the rotation of the hand/L/6 for one rotation of the main shaft is as described in Japanese Patent Publication No. 59-41268, and the grinding wheel G during this work is
By holding the grip 24 by hand and rotating it appropriately, the vertical slider 9 is slid in the rearward direction C4, so that a good contact state can be obtained at all times.

Next, to perform thinning on the ground drill bit tip, the device is used to perform thinning. Specifically, the clamp K is loosened, and the tip of the drill bit and the polishing wheel (+ polishing surface) are Tighten the clamp by rotating the tip angle setting plate 2 so that they are perpendicular to each other, and at the same time, hold the lever 16 by hand and swing it appropriately to slide the horizontal slider 8 in the left and right direction (in the top (u)). By doing so, one end edge of the grinding wheel G (m, see Fig. 2) is placed on the chisel edge E at a desired setting position P (the first
(see Figure A), and while rotating the polishing wheel by driving the wheel 30, hold the V-bar 31 by hand and rotate it in a semicircular arc in the direction of the arrow as shown in Figure 6. As a result, the grinding wheel G moves to the upper side of the drill cutting edge surface, and the chisel edge part of one half is thinned F1 from the point P set above. Thinning F2 is performed.

As described above, the device of the present invention can perform not only grinding but also thinning of a drill cutting edge with a single IJ grinding machine, and not only is there no need to prepare a separate thinning device, )) It is efficient and has excellent workability since it can be carried out continuously while it is held in the chuck, and it greatly contributes to cost reduction.

[Brief explanation of the drawing]

Figure 1 shows the cutting edge, A is a front view, B is a side view, Figure 2 is a perspective view of the entire device, Figure 3 is a front view seen from the C side of Figure 1, and Figure 3 is a front view of the cutting edge. 4 is a side view similarly seen from D, FIG. 5 is an exploded perspective view showing a slider groove related to a polishing stone mounting table, and FIG. 6 is an explanatory view of the operation. 1 . . . Device main body 2 . . . Point angle setting base plate 3
11. Spindle case 4...Chuck 5...Drill 6...Spindle rotation handle 8...Horizontal slider 9...Vertical slider 16...Lever 2
7... Grinding wheel mount 30... Motor 31... Lever G... Grinding wheel procedure amendment letter Mr. Michibu Uga, Commissioner of the Patent Office - 1. Indication of the case 1985 Patent Application No. 119527 2. Invention Name: Drill grinding machine 3, Relationship to the case of the person making the amendment: Name of patent applicant: Toa Kikai Co., Ltd. J!!! Works 4, Agent

Claims (1)

[Claims] (1) In a drill grinding machine that grinds a drill cutting edge, the grindstone mounting table is configured with a horizontal slider on the lower side and a vertical slider on the upper side on the main body of the device, the former in the left and right direction and the latter in the front and back. In addition to making it slide in the direction,
A grindstone mount equipped with a motor that rotates the grindstone is pivoted upward at the front edge of the vertical slider so as to be able to rotate in a semicircular arc, and the pivot point is located on the center line of the drill. , the drill cutting edge is first ground without rotating the grinding wheel in a semicircular arc, and then thinning is performed by rotating the grinding wheel in a semicircular arc toward the upper edge of the drill cutting edge. Drill grinding machine.