JPH0115444Y2 - - Google Patents

Description

[Detailed description of the invention] This invention consists of a head member to which a blade is attached, a holder member having a shank that can be connected to the head member and attached to the spindle of a machine tool, and a combination of the holder member and the head member. The present invention relates to an assembly type tool holder consisting of an intermediate member that is located between the two and can be connected to the two.

For example, in the case of a tool holder for drilling, the part with the cutting edge and the shank attached to the spindle of the machine tool 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 was devised that can be used for multiple purposes by dividing the tool into an assembly-type head member to which a blade is attached, a holder member, and an intermediate member.

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 installed at both ends of the coupling pin against the conical surfaces formed at both ends of the coupling pin. The conical surface of the set screw was brought into sliding contact with the conical surface of the coupling pin to firmly fix the above-mentioned 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, so It is necessary to provide a pin,
The structure has become more complex. 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.

This design has a conical surface in contact with the set screw at one end of the coupling pin, a pair of sloped surfaces at the other end to form a wedge-shaped surface, and a flattened surface perpendicular to the coupling pin insertion hole on a part of the small diameter shaft. Then, insert the coupling pin parallel to the flat surface so that a part of it is exposed in the small diameter shaft insertion hole,
The present invention relates to an assembly-type tool holder in which the wedge-shaped surface of the coupling pin and the engagement pin are brought into contact with each other, and the positioning is easy without providing an index pin, and the structure is simple and the work is easy.

Next, an embodiment of this invention will be explained with reference to the drawings. Fig. 1 shows a head member A with a cutting blade 1 attached to the tip.
This shows an assembly type tool holder in which an intermediate member B and a holder member C that can be attached to a spindle of a machine tool are connected and connected. Since the joining structure of each member is the same, the joining state of the head member A and the intermediate member B will be explained as an example. Note that the intermediate member B and the holder member C constitute a base holder member for attaching the head member A to the spindle, and the intermediate member B is not necessarily required and only the holder member C may be used, or depending on the work conditions, the intermediate member B There is no problem even if there are more than one.

A small diameter shaft 2 having a common axis with the head member is protruded from the rear end of the head member A having a cutting edge 1, and a flattened surface 3 parallel to the axis is provided on a part of the outer periphery 4 of the small diameter shaft 2. The outer periphery 4 and the inner end of the flattened surface 3 are continuous at a radius 5. Furthermore, a coupling pin insertion hole 6 is bored perpendicular to the flat surface 3, and a coupling pin 7 is inserted into the coupling pin insertion hole. The coupling pin has a wedge-shaped surface formed with a pair of slopes 17 and 18 at one end, and an inner conical surface 19 at the other end, and an elongated hole 8 is provided in the surface in the longitudinal direction of the coupling pin. ing. A set screw 9 is screwed into the small diameter shaft 2, and the tip of the set screw engages with an elongated hole 8, so that the connecting pin 7 can freely move by the length of the elongated hole.

On the other hand, in the intermediate member B, a small diameter shaft insertion hole 11 is opened from the end face along the axis, and a screw hole 14 is provided penetrating the small diameter shaft insertion hole 11 from the outer periphery toward the axis. A set screw 15 having a conical surface formed at the tip is screwed in. Also, the pin hole 12 is perpendicular to the screw hole 14 and the small diameter shaft insertion hole 11
The engaging pin 13 is driven into the small diameter shaft insertion hole 11 so that it does not come out.

In order to connect the head member A and the intermediate member B, the small diameter shaft 2 is inserted into the small diameter shaft insertion hole 11. When the coupling pin 7 protrudes from the flat surface 3, one slope 17 of the coupling pin 7 first comes into contact with the engagement pin 13. When the head member A is further pushed in, the slope 17 of the coupling pin 7 slides on the outer peripheral surface of the engagement pin 13, and the coupling pin 7 is slightly pushed into the coupling pin insertion hole 6. When the head member is further pushed in, the other slope 18 of the coupling pin comes into contact with the engagement pin and protrudes from the flat surface 3, and the insertion of the small diameter shaft 2 is completed.

Next, the set screw 15 is tightened to the coupling pin 7, and the coupling pin is pressed and fixed. The center line X of the coupling pin insertion hole 6 and the center line Y of the screw hole 14 are eccentric with respect to each other, and when the set screw 15 is tightened and the coupling pin 7 is pressed, the tip of the set screw 15 aligns with the inner conical surface of the pin 7. It is pressed into contact with 19 eccentrically. Since the pressed slope 18 of the connecting pin 7 is supported against the outer periphery of the engagement pin 13, the head member A is drawn toward the intermediate member B, and
Due to the wedge effect of the set screw 15 and the coupling pin 7, they are strongly and completely coupled and fixed.

The engagement pin 13 may be attached using a threaded pin 13A as shown in FIG. 4, or may be screwed at both ends as shown in FIG. is a conical surface, and set screw 1
It goes without saying that various modifications can be made, such as changing the conical surface of No. 5 to an inner conical surface.

As described above, this device has a conical surface 19 in contact with the set screw 15 at one end of the coupling pin 7 and a pair of sloped surfaces 17 and 18 at the other end to form a wedge-shaped surface, and is coupled to a part of the small diameter shaft 2. A flat surface 3 perpendicular to the pin insertion hole is formed, and the engagement pin 13 is inserted parallel to the flat surface so that a portion is exposed in the small diameter shaft insertion hole, and the wedge-shaped surface of the coupling pin 7 and the engagement pin 13 are inserted into the small diameter shaft insertion hole. Because they are in contact with each other, directionality occurs during installation, so the slope of the coupling pin can be easily brought to a position where it touches the side surface of the engagement pin without the need for a special index pin, thereby eliminating play. This simplifies the installation work. It also has a high structural rigidity and can sufficiently withstand cutting torque. Furthermore, even if the contact portion between the coupling pin 7 and the engagement pin 13 is worn out, if the coupling pin is pushed forward with the setscrew 15, it is possible to bring the coupling pin into contact with a new, unworn surface. It has many effects such as maintaining the performance of the system.

[Brief explanation of drawings]

Fig. 1 is a side view of an embodiment of this invention, Fig. 2 is a partial sectional view taken along the line of Fig. 1, and Fig. 3 is a side view of an embodiment of the invention.
4 and 5 are partial sectional views taken along the line in FIG. 4 and 5, which are other embodiments and correspond to FIG. 2. 1...Cutting edge, 2...Small diameter part, 3...Flat surface, 6
...Joining pin insertion hole, 7...Joining pin, 11...
Small diameter shaft insertion hole, 13... Engagement pin, 15... Set screw, 17... Slanted surface (wedge-shaped surface), 18... Slanted surface (wedge-shaped surface), 19... Conical surface of coupling pin, A... Head member , C... Holder member.

Claims (1)

[Scope of utility model registration request] It consists of a head member to which a blade is attached, and a holder member to be attached to the spindle of a machine tool, and one of the connected members has a small diameter shaft protruding in the axial direction, and the other member has the small diameter shaft insertion hole. Further, the small diameter shaft has a coupling pin insertion hole drilled perpendicularly to the axis, a coupling pin inserted into the coupling pin insertion hole, and a conical surface of the coupling pin eccentric to the axis of the coupling pin. In an assembly type tool holder whose connecting means is a set screw having a conical surface in contact with the set screw, the connecting pin has a conical surface in contact with the set screw at one end and a pair of sloped surfaces at the other end to form a wedge-shaped surface, and a small diameter shaft. a flat surface formed perpendicularly to the coupling pin insertion hole on a part of the shaft, an engagement pin inserted parallel to the flat surface so that a part of the shaft is exposed in the small diameter shaft insertion hole, and a wedge-shaped surface of the coupling pin. An assembly type tool holder characterized in that the and the engagement pin are in contact with each other.