JPS6238514B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a boring head for a BTA deep hole drill, and more particularly to an improvement in the head that allows for the replacement of worn cutting edges.

The cutting blade of conventional BTA drills was brazed to the main body, so if the cutting blade broke, the entire head had to be replaced. As a head to prevent this defect, each cutting blade is fixed to its respective support to form a cutting blade unit, and the unit is fastened to the main body with a screw that can be attached or removed from the front of the main body. Head for exchanging blades (Tokukosho
47-44104) is known. The head has the advantage that the cutting blade unit can be replaced from the front, but when multiple cutting blades are provided on the radius, it is structurally impossible to place the cutting blade units in close contact with each other. It is necessary to bisect it and place the cutting blade units on the two radii. When the cutting surface is divided into two, the opening through which the cutting chips flow is also divided into two, which results in a new problem in that the cross-sectional area of one opening becomes smaller and the flow of the chips tends to become uneven. In addition, the support has a shape that requires time and effort to process, and is very expensive as it is manufactured from chromium molybdenum steel, etc., but in order to replace it, it requires twice the number of cutting blades. It is clearly a bad idea to prepare

SUMMARY OF THE INVENTION It is an object of the present invention to provide a boring head with a plurality of adjacent cutting edges that are individually replaceable. In order to achieve this object, the gist of the present invention is to removably fasten a plurality of adjacent cutting edges forming a single cutting surface to a common single support,
This is a boring head in which the support is fixed to the main body so that the inclination can be finely adjusted.

The boring head of the present invention will be explained based on an embodiment shown in the drawings. As shown in FIGS. 1 to 3, a support 5 is attached to the front end of the hollow cylindrical main body 1.
are installed in the radial direction, and the guide chips 3 and 3' are installed in the circumferential direction. The support 5 is provided with three cutting edges 2 adjacent to each other forming a single cutting surface.
As shown in the figure, the sheet 11 is screwed to the cutting blade seat 13 of the support 5, and the cutting blade 2 is attached to the surface of the sheet.
Align the back sides of the A chip breaker 8 is shifted and applied to the surface of the cutting blade 2, a pawl 9 is engaged with the chip breaker, and the pawl is fastened to the support 5 with a forward and reverse screw 10.

As shown in FIGS. 1 to 3, the support 5 has a front surface 5a parallel to the cutting surface and a back surface 5b,
The front surface 5a and the back surface 5b are surface seats 1 formed on the main body 1.
a and the back seat 1b. The side surface 5c and the bottom surface 5d of the support body 5 are perpendicular to the surface 5a, and the side surface 5d of the main body 1
c and bottom seat 1d, respectively. A tightening bolt 4 extending perpendicularly from the outer periphery of the main body 1 to the back surface 5b of the support body 5
, and bring the support 5 into close contact with the back seat 1b. An adjustment bolt 7 extending axially from the front surface of the support body 5 to the bottom seat 1d is passed through the support body 5 to enable fine adjustment of the inclination angle of the support body 5 about the bolt 4. Main body 1
Pass the pressing bolt 6 through the side seat 1c at right angles from the outer periphery of the supporting body 5, and press the side surface 5c of the support body 5.
Finely adjust the amount of radial protrusion.

The cutting blade seat 13 is open on the front and surface, and has a V-shape when viewed from the surface. Both side parts 13a and 13b of the cutting blade seat 13 are narrowed in the axial direction, and have a concave V-shaped cross section. The cutting blade 2 and the sheet 11 have a truncated triangular pyramid shape with continuous side slopes, and the slopes narrow toward the back side. The chip breaker 8 also has a truncated triangular pyramid shape, but its side slopes narrow toward the front side. Both sides of the laminate consisting of the sheet 11, the cutting blade 2, and the chip breaker 8 are connected to both sides 13 of the cutting blade seat 13.
It has a convex V-shaped cross-section that closely engages the concave V-shaped cross-sections of a, 13b. Therefore, the support 5
Insertion and removal of cutting blades etc. into and out of the machine is limited to only from the front.

As mentioned above, in the boring head of the present invention, a plurality of cutting edges are adjacent to each other on the same radius line to form a single cutting surface, and the opening through which the chips flow is also single and has a large cross-sectional area, so that the chips flow easily. The process is never smooth. A worn or damaged cutting blade or the like can be easily replaced with a new one by loosening the forward/reverse screw 10, either alone or together with the chip breaker.
Only one support body 5 is required, and spare parts for replacement are not required, so the price is also reasonable. The V-shaped protruding side surface of the laminated body in which the cutting blade 2 is sandwiched between the sheet 11 and the chip breaker 8 fits into the side surface of the cutting blade seat 13 that is recessed in the same shape, so screws may loosen or the presser claw may be damaged during use. Since the cutting blade 2 does not fall off even if the cutting blade falls off, accidents caused by the cutting blade falling off can be prevented.

[Brief explanation of the drawing]

The drawings show a boring head according to one embodiment of the present invention; FIG. 1 is a side view partially shown in cross section, FIG. 2 is a side view rotated by 90 degrees from the position shown in FIG. 1, and FIG. is the front view, and Figure 4 is the front view of Figure 1.
FIG. 3 is an enlarged view showing a cross section taken along a line. 1: Main body, 2: Cutting blade, 4: Tightening bolt, 5: Support body, 6: Pressing bolt, 7: Adjustment bolt, 8: Chip breaker, 9: Jaw, 11: Sheet, 13: Cutting blade receiver.

Claims (1)

[Scope of Claims] 1. A plurality of cutting blade seats that look V-shaped from the surface are engraved on the support body, a sheet is detachably fixed to the surface of each cutting blade seat, and the cutting blade and the cutting blade are attached to the sheet. Chip breakers are stacked one after another, a claw is hooked onto the chip breaker, the claw is removably fastened to the support, each cutting edge is adjacent to each other to form a cutting surface, and the cutting surface is formed on the radius of the main body. 1. A boring head characterized in that the support body is removably fixed so that the support body is positioned such that 2. The support is provided with a back surface parallel to the front surface, and side and bottom surfaces perpendicular thereto, and the main body is provided with a front seat, a back seat, a side seat, and a bottom seat that engage with each surface of the support, and the support is fastened to the main body with a fastening bolt perpendicular to the back seat, and an adjustment bolt that reaches at right angles to the bottom seat at a position away from the fastening bolt is passed through the support body, and is higher than the fastening bolt. The boring head according to claim 1, characterized in that the main body is provided with pressing bolts that press the side surface of the support body at right angles in position, thereby making it possible to finely adjust the inclination of the cutting edge. . 3. The cross section of both sides of the laminate consisting of the sheet, the cutting blade, and the chip breaker is formed into a convex V-shape, and the both sides of the cutting blade seat are formed into a concave V-shape that engages with the convex V-shape, Claim 1 characterized in that the cutting blade and the chip breaker are prevented from falling off the surface of the support body by these.
The bowling head according to item 1 or 2.