JPH0239682Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention relates to a tool holder that forms a groove on the outer periphery of a bit workpiece in a machining center.

(Prior art) In recent years, there has been a remarkable development in machining centers, and in machining centers, a cutting tool (bite or cutter) with a cutting edge is attached to the holder, and the cutting tool cuts the outer circumference of the workpiece using circular interpolation. A predetermined groove is formed. Further, as disclosed in Japanese Utility Model Application Publication No. 51-134284, a wedge is provided at the tip of a cylindrical portion integrally formed with the shank, and a holder provided with an inclined support groove is inserted into the guide hole of the slider. Furthermore, by inserting a wedge into the inclined groove, the axial movement of the shank causes the wedge to move the holder in the radial direction, making it possible to freely adjust the radial distance of the cutting blade attached to the holder, and to freely rotate the main body. Some have a supporting housing in the middle of the main body.

(Problem to be solved by the invention) However, machining using the circular interpolation method takes much more time than lathe machining, so it is not efficient and has a negative impact on product costs. Moreover, in the above-mentioned device in which the holder is moved using the wedge and the inclined groove, the inclined groove is provided at an eccentric position on one side of the holder.
Eccentric movement may occur during rotation of the holder, which may adversely affect the tool and result in poor machining accuracy. Moreover, the end face of the housing must be in contact with the end face of the hole in the workpiece, and it is only possible to form a groove on the inner periphery of the hole.

(Means for Solving the Problems) This invention consists of a holder body having a shaft body and a shank in which a plurality of long grooves for balls in the longitudinal direction are formed on the outer periphery; a cylindrical member that engages with the shaft through a ball inserted into the cylindrical member; a spring that is inserted between the shaft and the cylindrical member and biases them in a direction away from each other; A tool holder is inserted into a cylindrical member perpendicular to the axis and has an inclined hole bored in the center, a tool is attached to the tool holder, and the tool is rotated by a bearing at the tip of the cylindrical body. a stop ring that is freely supported; a push rod that is attached to the shaft along the axis of the shaft and extends toward the tip of the cylindrical body through the inclined hole of the tool holder; and a push rod that is fitted into the inclined hole. This relates to a tool holder comprising a tilting piece inserted into the push rod, which structure converts the axial movement of the machine spindle into radial movement and transmits it to the tool housed in the holder, This machine can cut grooves on the outer periphery of a workpiece with high accuracy and in a short time comparable to that of a lathe.

(Function) In order to form the groove B on the outer periphery of the workpiece A, attach the cutting tool 27 to the cutting tool holder 22, and screw the screw 2.
Fix the bite with 8, then push rod 23
Insert a wrench into the hexagonal wrench hole 31, turn the screw 26 to move the push rod in the axial direction, and move the inclined piece 24 within the inclined hole 21 to adjust the position of the cutting blade 30. The holder main body 1 attached to a main shaft of a machine (not shown) moves downwardly on the shaft body 3 in FIG. 1 while rotating, and the stop spring 1
The end face 12 of 5 will press against the end face of workpiece A. Since the stop ring 15 is supported by the bearing 14, it stops rotating when the workpiece A is pressed against it, and presses the workpiece A. The holder main body 1 is pushed down while rotating as it is. The shaft body 3 is guided down the long ball groove 7 by the ball 20, and the push rod 23 is also guided down by the hole 13a. When the push rod 23 goes down, the slope piece 2
4 also descends parallel to the axis, and the outer peripheral surface of the inclined piece 24 slides on the inner peripheral surface of the inclined hole 21 to move the tool holder 22 to the right, and the tool cutting blade 30 attached to the tool holder 22 is inserted into the predetermined groove B. form quickly. As mentioned above, when the predetermined groove B is formed, the numerically controlled spindle rises in the drawing, and the push rod 23 also rises at the same time, so that the cutting edge 30 of the cutting tool is separated from the outer periphery of the workpiece A.

(Example) An example of this invention will be described with reference to FIGS. 1 and 2. The tool holder body 1 has a taper shank 2
and a shaft body 3. A plurality of coil spring holes 4 and a screw hole 5 are bored in the lower surface of the shaft body along the axis (X-X). A push rod 23 is inserted into the screw hole through the push rod insertion hole 6, and is fixed by screwing the threaded portion 26 into the push rod insertion hole 6. A plurality of long ball grooves 7 (six in this embodiment) are formed in the outer periphery of the shaft body 3 in the longitudinal direction, and a ball 20 is inserted into each groove.

On the other hand, the cylindrical member 8 fitted around the outer periphery of the shaft body 3 is provided with through holes 19 of the same number as the long grooves 7 for balls, and balls 20 are inserted into the through holes. Note that 21 is a cover for preventing the ball from falling off. A plurality of guide pin holes 10 are bored in the bottom 32 of the shaft fitting hole 9 of the cylindrical member 8, and guide pins 17 are bored in these holes. Furthermore, a hole 11 is formed in the cylindrical member 8 perpendicularly to the axis (X-X) into which a tool holder 22, which is a tool holder, is inserted, and the tool holder is inserted into the hole 11. A cutting tool 27 having a cutting edge 30 formed toward the axis (X-X) is fixed to the tool holder with a screw 28. Note that a notch 29 formed at the tip of the cylindrical member 8 allows the cutting tool to move in the radial direction. Further, a push rod insertion hole 13 passes through the center of the bottom 32 of the cylindrical member 8, through which the push rod 23 is inserted. The coil spring 18 is inserted into the coil spring hole 4 of the shaft body 3, the other end of which contacts the bottom 32 of the shaft fitting hole of the cylindrical member 8, covers the guide pin 17 protruding from the bottom, and the shaft body 3 and cylindrical member 8
and are urged in directions away from each other. Further, a hexagonal wrench hole 31 is provided at the tip of the push rod. In addition, the hole 6 of the shaft body 3 and the push rod part 2
3a, hole 13a of cylindrical member 8 and push rod 2
3b are fitted with a small gap between each other, and the push rod always maintains its axis position. For this reason, the depth of cut of the cutting tool should be accurate,
The cut surface roughness is extremely good.

Further, an inclined piece 24, which is formed by cutting a cylindrical member diagonally to form parallel inclined surfaces, is fitted onto the push rod 23 and fixed by a ring spring 25. The tool holder 22 has the inclined piece 24 in the center.
A slanted hole 21 with parallel surfaces into which a push rod 23 can be inserted is drilled, and a push rod 23 extends forward through the slanted hole. Note that when the tilting piece is moved upward in the axial direction in the drawing, the cutting tool holder 22 moves to the left in the drawing, and the rotation locus of the cutting blade 30 is increased. On the contrary, when the tilting piece 24 is moved downward on the axis in the drawing, the cutting tool holder 22 moves to the right in the drawing, and the rotation locus of the cutting blade 30 becomes smaller.
You can set the outer diameter before machining. Furthermore, a bearing 14 is press-fitted into the tip of the cylindrical member 8 and fixed by a ring spring 16.
5 is rotatably supported.

Note that the cutting depth of groove B is controlled by the main shaft that holds shank 2;
Since the amount by which the groove should be pushed down to form a groove of a predetermined depth can be determined by calculation, the numerical value is stored on the main shaft side.

The screw 33 is used to fix the push rod 23 to the shaft 3 so that it does not move after adjustment. The shank 1 shown in FIG. 3 is an embodiment in which the shank 1 is straight, and is held by a side lock holder or chuck.

(Effects) Because this device has the above-mentioned structure, the axial motion at the center of the main shaft of the machine is converted into radial motion and transmitted to the cutting tool housed in the holder body, allowing machining without causing eccentric motion. Grooving can be performed accurately on the outer circumference of objects in a short time. Furthermore, by changing the direction of the cutting tool, a groove can be formed on the inner periphery of the hole. As a result, machining centers can perform groove processing as easily as lathes, further expanding the range of applications for machining centers. Furthermore, it has many remarkable effects, such as being able to process products that have irregular shapes or are very large and cannot be turned by gripping them with a lathe or the like.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway front view of the present invention, Fig. 2 is a sectional view taken along line A-A in Figs. 1 and 3, and Fig. 3 is a partially cutaway front view of another embodiment of the present invention. It is. DESCRIPTION OF SYMBOLS 1...Holder body, 2...Shank, 3...Shaft body, 7...Long groove for ball, 8...Cylindrical member, 14
... Bearing, 15 ... Stop ring, 18 ... Spring, 21 ... Inclined hole, 22 ... Tool holder (bite holder), 23 ... Push rod, 24 ...
Inclined piece, 27...tool (bite), 30...cutting blade.

Claims (1)

[Scope of utility model registration request] Through a holder main body 1 having a shaft body 3 and a shank 2 with a plurality of longitudinal ball grooves 7 formed on the outer periphery, and a ball 20 fitted to the outer periphery of the shaft body and inserted into the ball long grooves. a cylindrical member 8 that engages with the shaft; a spring 18 that is inserted between the shaft and the cylindrical member and biases them in a direction away from each other; A tool holder 22 is inserted into a cylindrical member and has an inclined hole 21 in the center thereof, a tool 27 is attached to the tool holder, and the tip of the cylindrical member is rotatably supported by a bearing 14. a push rod 23 attached to the shaft along the axis of the shaft and extending through the inclined hole 21 of the tool holder toward the tip of the cylindrical body.
and a tilting piece 24 that fits into the tilted hole and is inserted into the push rod.