JPH0115443Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement of a tool holder having a cutting blade at the tip and a shank attachable to a spindle at the rear end.

For example, in the case of a tool holder for drilling, the part with the cutting edge and the shank where the machine tool is attached to the spindle are integrated, so there is a limit to the depth of drilling, and even though the hole diameter is the same, If the drilling length becomes longer, the holder must be replaced with another one. Therefore, an assembly-type tool holder that can be used for multiple purposes was devised by dividing the tool holder member to which the cutting blade is attached, an intermediate holder member, and a shank member and making the assembly type.

These assembly type tool holders are
As disclosed in Publication No. 51004, one member is provided with a small diameter shaft protruding in the axial direction, and the other member is provided with a small diameter shaft insertion hole to insert the small diameter shaft,
A coupling pin is inserted orthogonally to the small diameter axis, and a pair of setscrews whose axes are eccentric to the axis of the coupling pin are assembled into both ends of the coupling pin to secure the conical surfaces formed at both ends of the coupling pin. The conical surface of the screw was brought into sliding contact with the conical surface of the coupling pin to firmly fix the above-mentioned two members to each other. For this reason, if each member to be assembled is not placed at a predetermined angular position, looseness will occur, and it is very difficult to match the coupling pin and set screw properly. This made the structure complicated. Furthermore, if the conical surfaces of the coupling pin and set screw wear out, they must be replaced, and the rigidity against cutting torque is not necessarily sufficient.

In the present invention, a round shaft having the same axis as that of the tool holder member and the base holder member is protruded from the annular end surface of either one of the tool holder member and the base holder member, and the outer periphery of the round shaft is provided with a plane passing through the axis as a reference. to form an inclined surface that deepens in the axial direction from the rear end surface of the round shaft toward the cutting edge side, and a hole into which the round shaft is inserted is bored in the axial direction in the annular end surface of the other member, and the hole is perpendicular to the hole. At the same time, a pair of tightening pins having an inclined surface on the inner end and having threaded holes in opposite directions are inserted into the pin holes, and then both threaded bolts are inserted into the threads of both screws. A tightening pin is connected by screwing into the hole, and a guide pin is implanted at a symmetrical position on the inner circumferential surface of the pin hole, and a guide groove that engages with the guide pin is formed on the outer circumferential surface of the tightening pin. A coupling mechanism that is installed in the axial direction and allows the inclined surfaces of a pair of tightening pins to come into surface contact with both inclined surfaces of the round shaft by rotating a double threaded bolt with the round shaft inserted into the hole of the rear position member. The present invention relates to an assembly type tool holder in which a pushing force acts between both members, and a synergistic effect of the tightening force and the tightening pin enables a strong connection without play.

Embodiments will be described below with reference to the drawings. In FIG. 1, the assembled tool holder of the present invention includes a tool holder member 1 having a cutting blade 21 attached to its tip, an intermediate holder member 6, and a shank member 20 having a shank for attaching to a spindle. The intermediate holder member 6 and the shank member 20 constitute a base holder member for attaching the tool holder member 1 to the spindle, and each member is connected to a round shaft 2 protruding from the rear end of the front member. are connected together. Note that, as will be described later, the base holder member does not necessarily require the intermediate holder member 6, and only the shank member 20 may be used, or there may be a plurality of intermediate members 6. Since the structure of the joint of each member is the same and is compatible, the structure of the joint will be explained with respect to the joint between the tool holder member 1 and the intermediate holder member 6.

At the rear end of the tool holder member 1, a round shaft 2 having the same axis and having a diameter smaller than the outer diameter of the holder is provided protrudingly. Slanted surfaces 4 and 5 symmetrical with respect to a plane X--X containing the axis of the round shaft are formed on the outer peripheral surface of the round shaft from the rear end surface 3 toward the axis on the cutting blade 21 side. On the other hand, a hole 7 into which a round shaft is inserted is formed in the intermediate holder member 6 in the axial direction from the annular end surface 24 toward the axis. A pin hole 8 for the tightening pins 11 and 12 communicates with the hole 7 and passes through the round shaft 2 perpendicularly to the plane XX,
The inner peripheral surface of the pin hole 8 has a surface X perpendicular to the axis of the pin hole 8.
Guide pins 9 and 10 are driven into positions symmetrical to -X. A pair of tightening pins 11 and 12 to be inserted into the pin hole 8 are provided with one-stop guide grooves 13 and 14 in the axial direction on the outer circumferential surface, and are eccentric to the axis of the tightening pin to form a left-hand threaded hole. 15 and a right-hand threaded hole 16 are drilled, and the inner end of the tightening pin has a round shaft inclined surface 4,
Slanted surfaces 18 and 19 are formed for engagement with 5. Guide grooves 13, 1 for tightening pins 11, 12
4 is made to stop at one end on the outer circumferential side of the holder in order to prevent the tightening pins 11 and 12 from slipping out of the pin holes 8 and being lost when the tool holder member 1 is separated from the intermediate holder member 6. It is also possible to prevent chips and the like from entering the hole 7 during cutting. Guide groove 1 is inserted into guide pins 9 and 10 from both sides of pin hole 8.
3 and 14, insert the tightening pins 11 and 12, and insert the double threaded bolt 17 into the left threaded hole 15 and the right threaded hole 1.
6 to connect the tightening pins 11 and 12.
The connected tightening pins 11 and 12 are double threaded bolts 1
By rotating 7, it can move within the pin hole 8 by expanding outward or closing inward.

Attach the tightening pins 11 and 12 to the pin holes 8 of the intermediate holder member 6 with double-threaded bolts 17, and insert the round shaft 2 of the tool holder member 1 into the hole 7 of the intermediate holder member 6.
is inserted with the inclined surfaces 4 and 5 facing downward as shown in the figure, and when the double-threaded bolt 17 is rotated clockwise from the tightening pin 11 side with a hex wrench, the tightening pins 11 and 12 are inserted into the guide pins 9 and 10 from both sides. Guided by round shaft 2
The inclined surface 18 contacts the inclined surface 4, and the inclined surface 19 contacts the inclined surface 5, respectively, so that the inclined surfaces 4,
5 to fix the round shaft 2 of the tool holder member 1 in the hole 7 of the intermediate holder member 6. The inclined surfaces 4 and 5 become deeper in the axial direction toward the cutting edge, and the tightening pin 1
When 1 and 12 are tightened, the round shaft 2 is attached to the intermediate holder member 6.
A pushing force acts to the side, and due to the synergistic effect of the clamping force and the clamping pin, the annular end surface 24 of the intermediate holder member 6 and the annular end surface 25 of the tool holder member 1 are brought into close contact and can be firmly connected. There is. Power is transmitted by a tightening pin 11 attached to the intermediate holder member 6,
The inclined surfaces 18 and 19 of 12 are the inclined surfaces 4 and 5 of the round shaft 2.
It is in contact with the body, and it is touching the face.

In this embodiment, an index pin 22 is provided on the annular end surface 24 of the intermediate holder member 6 and extends parallel to the axis of the intermediate holder member 6, and a corresponding pin formed on the annular end surface 25 of the tool holder member 1 is provided. hole 2
This is because the inclined surfaces 4 and 5 provided on the round shaft 2 of the tool holder member 1 engage with the tightening pins 11 and 12 in the pin holes 8 of the intermediate holder member 6. An index pin 22 and a pin hole 23 are formed in a positional relationship in which the surfaces contact the inclined surfaces 18 and 19, and when the intermediate holder member 6 and the tool holder member 1 are connected, the inclined surfaces 4 and 5 of the round shaft 2 and the pin are formed. The inclined surfaces 18 and 19 of the tool holder member 1
This facilitates assembly of the intermediate holder member 6.

Furthermore, in order to separate the tool holder member 1 from the intermediate holder member 6, it is only necessary to loosen both threaded bolts 17, so that the tool holder member 1 can be easily replaced. The connection between the intermediate holder member 6 and the shank member 20 is similarly achieved by inserting the round shaft 2 protruding from the rear end surface of the intermediate holder member 6 into the hole 7 provided at the front end surface of the shank member 20 and tightening the tightening pin. It is done in exactly the same way. The base holder member for attaching the tool holder member 1 to the spindle may be coupled by fitting the round shaft 2 of the tool holder member 1 into the hole 7 of the shank member 20 without using the intermediate member 6.

It is also possible to provide the round shaft 2 in the base holder member and provide the hole 7 into which it is inserted in the tool holder member 1.

According to this invention, it is an assembly type that is divided into a base holder member consisting of a tool holder member 1 to which a cutting blade is attached and a shank member 20 that can be attached to a spindle. The inclined surfaces 4 and 5 of the round bar 2 are brought into surface contact and pressed by the inclined surfaces 18 and 19 of 12, and the inclined surfaces 4 and 5 of the round shaft are deepened in the axial direction toward the cutting edge side, so tightening is possible. When the pins 11 and 12 are tightened, a force is exerted to push the round shaft 2 toward the base holder member, and due to the synergistic effect of the tightening force and the tightening pin, the two are firmly connected without play. In addition, since it is in contact with the surface as described above, the rigidity is high and rotational torque is reliably transmitted. Furthermore, the joints do not loosen even in the face of machine vibrations or strong cutting resistance during cutting, allowing high-precision cutting to be maintained.

In addition, the tool holder member with the cutting edge can be easily replaced on the machine by simply operating the double-threaded bolt, and there are many effects such as being able to eliminate wasted setup time.

[Brief explanation of the drawing]

Fig. 1 is a side view of the main parts of the embodiment of the present invention, showing the state of connection of each member, Fig. 2 is a cross-sectional view taken along line AA in Fig. 1, and Fig. 3 is a cross-sectional view taken along line B-B in Fig. 2. , FIG. 4 is a sectional view taken along the line CC in FIG. 2. 1... Tool holder member, 2... Round shaft, 3...
Rear end surface, 4, 5... Inclined surface, 6... Intermediate holder member, 7... Hole, 8... Pin hole, 9, 10... Guide pin, 11, 12... Tightening pin, 13, 14...
... Guide groove, 15, 16 ... Threaded hole, 17 ... Double threaded bolt, 18, 19 ... Inclined surface, 20 ... Shank member, 21 ... Cutting blade, 22 ... Index pin, 23 ... Pin hole , 24... annular end surface, 25...
...Annular end face.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) In an assembly type tool holder consisting of a tool holder member having a cutting edge at the tip and a base holder member having a shank at the rear end that can be attached to the spindle of a machine tool, the tool holder The annular end surface of either the member or the base holder member has an axial center that is the same as that of the member, and a slope that deepens in the axial direction from the rear end surface toward the cutting edge side with respect to the plane passing through the axis on the outer periphery. The other member has a round shaft formed with a surface, and the annular end face of the other member has a hole into which the round shaft is inserted, and a pin hole perpendicular to the hole, with holes facing in the longitudinal direction opposite to each other. A pair of tightening pins each having a screw hole and an inclined surface corresponding to the inclined surface of the round shaft at the inner end are inserted into the pin hole, and further, both screw holes are inserted into each screw hole of the pair of tightening pins. A threaded bolt is screwed together, guide pins are implanted at symmetrical positions on the inner peripheral surface of the pin hole, and a guide groove that engages with the guide pin is provided in the axial direction on the outer peripheral surface of each tightening pin. , an assembly type tool holder in which the inclined surfaces of each tightening pin can come into surface contact with both inclined surfaces of the round shaft of the other member. (2) The assembly type tool holder according to claim 1, wherein the base holder member is comprised only of a shank member. (3) The assembly type tool holder according to claim 1, wherein the base holder member includes an intermediate holder member and a shank member.