JPH0416297B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention aims to solve the following problems.

(Field of Industrial Application) This invention relates to a floating holder for holding a cutting tool such as a reamer, which is inserted into a machined hole in a workpiece to machine the inner surface of the machined hole, on the main shaft of a machine tool. .

(Prior art) In conventional holders of this type, a holding sleeve capable of fixing a cutting tool is provided on the main body so as to be tiltable, and the cutting tool fixed to the holding sleeve is tilted relative to the axis of the main body. Since it is designed to be able to tilt, when the cutting tool is held horizontally, the cutting tool will hang down due to its own weight relative to the axis of the main body, that is, the axis of the main shaft (spindle) of the machine tool, and the tip of the cutting tool will be machined. Not only is it difficult to align the cutting tool with the hole, but also a large force is applied to the cutting tool due to misalignment when the cutting tool is inserted into the processing hole, making it difficult to ensure highly accurate processing. There have also been proposals in which the retaining sleeve is positioned with pins or steel balls to prevent the cutting tool from hanging, but the axis of the machined hole may be misaligned or inclined with respect to the axis of the main body. In this case, when the cutting tool is inserted into the machined hole, a large force due to misalignment acts on the cutting tool, making it difficult to ensure a highly accurate inner diameter and inner surface roughness.

(Problems to be Solved by the Invention) This invention eliminates the above-mentioned conventional problems, prevents the cutting tool from hanging down when the cutting tool is held horizontally, and allows the cutting tool to be held by applying a light force to the axis of the main body. A floating type holder that can be moved in parallel and tilted, allowing the inner surface of the machined hole to be machined with high precision even if the axis of the machined hole is misaligned or tilted with respect to the axis of the main body. The aim is to provide tools.

The configuration of the present invention is as follows.

(Means for Solving the Problems) The present invention takes the measures as described in the claims above, and its effects are as follows.

(Function) The function of the present invention is to bring the base of the holding sleeve into contact with the receiving surface of the main body through an elastic body, position the center of the base on the axis of the main body, and fix the base in the hollow hole of the holding sleeve. Align the axis of the cutting tool with the axis of the main body. When a cutting tool is inserted into a machined hole that is misaligned with respect to the axis of the main body, the holding sleeve deforms the elastic body and moves parallel to the direction perpendicular to the axis of the main body, so that the cutting tool aligns with the machined hole. is inserted with light force. Also, when a cutting tool is inserted into a machined hole that is inclined with respect to the axis of the main body, the holding sleeve deforms the elastic body and tilts with respect to the axis of the main body, so that the cutting tool is inserted into the machined hole with a light force. be done.

(Example) Below, drawings showing examples of the present application will be described. Reference numeral 1 denotes a hollow cylindrical main body, in which a hollow hole 2 which is open at the other end (the right end in FIG. 1) is concentrically formed. A female thread 2a is formed on the inner circumferential surface of the hollow hole 2 on the opening side. 3 is main body 1
A mounting wall integrally provided at one end of the hollow hole 2
One end of the is closed. Reference numeral 4 designates a shank portion exemplified as a mounting portion integrally provided on the outer surface of the mounting wall 3, and is provided so that its axis coincides with the axis of the main body 1. A male thread 4a is carved on the outer peripheral surface of this shank portion 4. This shank portion 4 is for attaching the main body 1 to the main shaft of a machine tool. Incidentally, the above-mentioned attachment portion may be constituted by an attachment flange or the like. 5 is a key provided on the shank portion 4, and 6 is a lock nut screwed onto the male screw 4a. 7 is the above-mentioned mounting wall 3 and shank part 4
The connecting hole is formed in the main body 1 and is centered on the axis of the main body 1. Ball fitting grooves 8 are formed on the inner circumferential surface of the connecting hole 7 to extend in the axial direction of the main body 1, and are formed at symmetrical positions with respect to the axis. Next, 9 is a fitting recess formed in the inner part of the hollow hole 2, and 10 is a retaining ring fitted into the fitting recess 9, whose side surface on the hollow hole 2 side is relative to the axis of the main body 1. It is formed on a right-angled surface. This side surface constitutes a receiving surface 11 for receiving one end of a holding sleeve, which will be described later. Reference numeral 12 denotes an adjustment ring screwed onto the female thread 2a of the hollow hole 2. 13 is a seat formed in the adjustment ring 12, and the hollow hole 2
It is formed in an annular shape so as to protrude toward the center from the inner circumferential surface of. This seat 13 is formed on a surface perpendicular to the axis of the main body 1. 14 is adjustment ring 1
It is a contact surface formed on the inner circumferential surface of one end side of the main body 2, and is formed in an annular shape centered on the axis of the main body 1. Note that the abutting surface 14 may be formed by the inner circumferential surface of the hollow hole 2. Reference numeral 15 denotes a set screw screwed onto the other end of the adjustment ring 12, so that the adjustment ring 12 can be fixed to the main body 1 at an appropriate screwing position. 1
Reference numeral 6 denotes an annular dustproof seal fitted to the inner circumferential surface of the other end of the adjustment ring 12, which is made of a material such as rubber and comes into contact with the outer circumferential surface of a holding sleeve, which will be described later, to seal therebetween.

Next, reference numeral 17 denotes a hollow cylindrical holding sleeve inserted into the hollow hole 2 of the main body 1, and therein is a hollow hole 18 opened at the other end on the same side as the opening side of the main body 1. formed concentrically. This hollow hole 18 is for fixing a cutting tool 19 such as a reamer. Reference numeral 20 denotes a connecting hole formed in the base of the holding sleeve 17 on the side opposite to the opening side, and is formed centered on the axis of the holding sleeve 17. 21 is a holding sleeve 1 on the inner peripheral surface of the connecting hole 20.
The ball fitting groove is formed long in the axial direction of 7.
They are each formed at symmetrical positions with respect to the axis.
22 is a connecting shaft having one end inserted into the connecting hole 7 and the other end inserted into the connecting hole 20 with a gap therebetween;
A flange-like locking piece 23 is provided on the outer periphery of the intermediate portion. The outer diameter of this locking piece 23 is larger than the inner diameter of the communicating holes 7 and 20. 24 is the connecting shaft 22
These are recesses formed on the outer circumferential surface of one end of the recesses, and are formed at symmetrical positions with respect to the axis of the connecting shaft 22, as shown in FIG. 25, 25 are the recessed portions 2
4 and 24, which are fitted into the ball fitting grooves 8 and 8 so as to be movable in the longitudinal direction. Recesses 26 are formed on the outer circumferential surface of the other end of the connecting shaft 22, and are respectively formed at symmetrical positions with respect to the axis of the connecting shaft 22. These recesses 26,2
6 is formed at a position displaced by 90 degrees in the outer circumferential direction with respect to the recesses 24, 24. Balls 27, 27 are fitted in the recesses 26, 26, and are fitted in the ball fitting grooves 21, 21 so as to be movable in the longitudinal direction.

Next, 28 is an engagement pin fixed to the holding sleeve 17 so that its tip protrudes into the hollow hole 18;
They are provided at opposing positions, respectively. Reference numeral 29 denotes a set screw for attaching a cutting tool which is screwed into the screw hole 30 of the holding sleeve 17. 31 is the holding sleeve 17
A cylindrical sleeve fitted into a hollow hole 18, with a fitting hole 3 in the center for fitting the base of the cutting tool 19.
2 is formed. One end of this fitting hole 32 is formed into a square hole 32a having a square cross section as shown in FIG.
9a can be tightly fitted.
Reference numeral 33 denotes engagement grooves formed at one end of the cylindrical sleeve 31, and are formed at opposing positions.
These engagement grooves 33, 33 are connected to the engagement pin 28,
28. 34 is a cylindrical sleeve 31
A screw insertion hole is formed at a position overlapping with the screw hole 30 described above. Various cylindrical sleeves 31 are prepared depending on the type and size of the cutting tool 19, and the one corresponding to the cutting tool 19 used is used.

Next, reference numeral 35 denotes a fitting portion formed on the outer periphery of the base of the holding sleeve 17, and is formed so as to be centered on the axis of the holding sleeve 17. 36 is the fitting part 3
5, the shank portion 4
The side surface is formed perpendicular to the axis of the holding sleeve 17, and this side surface 36a is formed on the receiving surface 11.
is facing. Reference numeral 37 denotes a ball interposed between the side surface and the receiving surface 11, and a large number of balls are interposed in a line over the entire circumference. These balls 37 are prevented from coming off by a collar, which will be described later, fitted to the outer peripheral surface of the holding sleeve 17. 38 is a contact surface formed on the outer peripheral surface of one end of the holding sleeve 17;
It is formed into an annular shape centered on the axis of the holding sleeve 17. Reference numeral 39 denotes a locking portion formed in the shape of a brim at one end of the contact surface 38. Reference numeral 40 denotes an annular collar fitted to the abutment surface 38 and engaged with the locking portion 39 . A part of this collar 40 surrounds the outer periphery between the abutment ring 36 and the receiving surface 11, and the ball 3
7 is prevented from coming out. Reference numeral 41 denotes a seat formed on the collar 40, which is formed in an annular shape so as to extend outward from the contact surface 38. This seat 41 is formed in a plane perpendicular to the axis of the holding sleeve 17. 42 is a coil spring exemplified as a cylindrical elastic body located in the space between the inner circumferential surface of the hollow hole 2 of the main body 1 and the outer circumferential surface of the holding sleeve 17; The end faces of the other ends are elastically abutted on the respective seats 13, and both the seats 4
Elastic force is applied in the direction of separating 1 and 13. Further, the inner peripheral surface of one end of the coil spring 42 is connected to the abutting surface 38, and the outer peripheral surface of the other end is connected to the abutting surface 14.
are in contact with each other. In this case, it is preferable that two or more turns at both ends of the coil spring 42 contact the contact surfaces 38 and 14, respectively, as shown in FIG. 1, as this ensures reliable support of the holding sleeve 17.
Only one turn of the coil spring 42 may contact the contact surfaces 38, 14.

When using the above structure, first screw the male screw 4a of the shank portion 4 into the screw hole of the main shaft of the machine tool, and then use the key 5 to lock the relative rotation. At the same time, it is locked by a lock nut 6, and the main body 1 is attached to the main shaft. Further, with the set screw 29 loosened, the cylindrical sleeve 31 is fitted into the hollow hole 18 of the holding sleeve 17, and the engagement grooves 33, 33 are engaged with the engagement pins 28, 28. Further, the base of the cutting tool 19 is fitted into the fitting hole 32 of the cylindrical sleeve 31, and the shank portion 19a of the cutting tool 19 is fitted into the square hole 32a, and then the set screw 29 is tightened to secure the tip of the set screw 29. It is brought into contact with the base of the cutting tool 19. As a result, the cutting tool 19 is integrally secured to the cylindrical sleeve 31, and the cylindrical sleeve 31 is integrally secured to the holding sleeve 17. With the cutting tool 19 attached to the holding sleeve 17 as described above, when the cutting tool 19 is turned sideways, the weight of the cutting tool 19 acts on the holding sleeve 17, causing the holding sleeve 17 to descend or tilt. However, the abutment ring 3 fitted to one end of the holding sleeve 17
6 is pushed into the ball 36 by the elastic force of the coil spring 42.
Since the retaining sleeve 17 is in contact with the receiving surface 11 of the retaining ring 10 through the retaining sleeve 17, the posture of the retaining sleeve 17 is maintained such that its axis is parallel to the axis of the main body 1. Further, one end of the holding sleeve 17 is supported by the coil spring 42 so that its axis coincides with the axis of the main body 1, so that the holding sleeve 17 is prevented from descending and is held at its original position. Therefore, the cutting tool 19 held by the holding sleeve 17 is prevented from hanging down and is held so that its axis coincides with the axis of the main body 1. The magnitude of the elastic force of the coil spring 42 is adjusted by rotating the adjustment ring 12 with the set screw 15 loosened. If the magnitude of the elastic force of this coil spring 42 is set to be as small as possible within the range that can hold the cutting tool 19 so that its axis line coincides with the axis line of the main body 1 as described above, the cutting tool 19 can be floated with a light force. That is, it is preferable that it can be moved parallel to the axis of the main body 1 or tilted.

Next, the cutting tool 19 is inserted into a hole drilled in the workpiece using a drill or the like. In this case, since the cutting tool 19 is held so that its axis coincides with the axis of the main body 1, the axis of the cutting tool 19 can be changed by moving the main shaft so that its axis coincides with the axis of the machined hole. The cutting tool 19 can be aligned with the axis of the machined hole, and the cutting tool 19 can be easily inserted into the machined hole. Furthermore, when inserting the cutting tool 19 into a machined hole as described above, if the axis of the machined hole 50 is out of alignment with the axis of the main body 1 as shown in FIG. Cutting tool 1 in hole 50
9, the cutting tool 19 receives a force to move in parallel, and the force is transmitted to the cylindrical sleeve 31, the holding sleeve 17, the ball 37, and the coil spring 42 in this order, so that the holding sleeve 17 moves as shown in FIG. As shown in FIG. 3, the coil spring 42 is oscillated laterally and moved in parallel with the cylindrical sleeve 31 and the cutting tool 19 with a light force, and the cutting tool 19 is smoothly inserted into the machined hole 50. Also, as shown in Fig. 8, the machined hole 5
1 is inclined with respect to the axis of the main body 1, when the cutting tool 19 starts to be inserted into the machined hole 51, the cutting tool 19 receives a force to tilt, and the force is applied to the cylindrical sleeve 31 and the holding tool. Sleeve 17, ball 3
7 and the coil spring 42 in this order, the holding sleeve 17 compresses the coil spring 42 as shown in FIG.
1 is inserted smoothly.

Next, when the main shaft is rotated in one direction, the main body 1 is rotated in the same direction, and this rotation of the main body 1 causes the ball 2 to rotate.
5, 25, the connecting shaft 22 and the balls 27, 27 to the holding sleeve 17, and the holding sleeve 17, the holding sleeve 31, and the cutting tool 19 are also rotated in the same direction. As a result, the cutting tool 19 is rotated within the machined hole, and the inner surface of the machined hole is machined to a desired inner diameter and surface roughness. In this case, even if the axis of the machined hole is misaligned or inclined with respect to the axis of the main body 1 as described above, one end of the holding sleeve 17 is attached to one end of the main body 1 with the ball 2.
5 and 25 are connected by the connecting shaft 22 and balls 27 and 27 so that they can move freely in the direction perpendicular to the axis, so that the cutting tool 19 can be rotated smoothly within the machined hole without being subjected to unreasonable biasing force. This allows the inner surface of the hole to be machined with high precision.

Next, after completing the machining of the machined holes that are misaligned or inclined with respect to the axis of the main body 1 as described above, when the cutting tool 19 is pulled out from these machined holes, the holding sleeve 17 will hold the coil. The returning force of the spring 42 returns the cutting tool 19 to its original position, and the cutting tool 19 is held again so that its axis coincides with the axis of the main body 1.

FIG. 10 shows a different embodiment of the elastic body of the present application, which is composed of an elastically deformable metal cylindrical body 55 having a bellows portion 55a. Note that this elastic body may be composed of a cylindrical rubber or resin elastic cylinder.

In the present application, when the receiving surface of the main body is inclined with respect to a plane perpendicular to the axis of the main body and one end of the holding sleeve is also inclined in the same direction, and one end of the holding sleeve is brought into contact with the receiving surface. The axis of the retaining sleeve may coincide with the axis of the main body. Alternatively, the contact surface of the main body may contact the inner peripheral surface of the elastic body, and the contact surface of the holding sleeve may contact the outer peripheral surface of the elastic body. Further, the annular contact surface does not need to be a continuous surface, and may be composed of divided surfaces.
Furthermore, it can also be used when the attachment part of the main body is attached to a fixed shaft and the workpiece is rotated and machined.

(Effects of the Invention) As described above, in the present invention, when the cutting tool 19 is held by the floating type holder, the cutting tool 19 is fixedly attached to the hollow hole 18 of the holding sleeve 17. can be held rotatably relative to the main body 1. Therefore, when inserting the cutting tool 19 into a machining hole of a workpiece to perform finishing machining of the machining hole, the cutting tool 19 is inserted into the machining hole after attaching the attachment part 4 of the main body 1 to the main shaft of a machine tool, etc. In this state, the main body 1 and the workpiece are rotated relative to each other, thereby machining the hole. In addition, when the cutting tool 19 is held by the floating holder, even when the axis of the main body is oriented horizontally, the base of the holding sleeve 17 is brought into contact with the receiving surface 11 of the main body 1 by the elastic body, and the center of the base is kept in contact with the receiving surface 11 of the main body 1. By positioning the holding sleeve 17 on the axis of the main body 1, the axis of the holding sleeve 17 can be made to substantially match the axis of the main body 1, and the axis of the cutting tool 19 can be made to substantially match the axis of the main body 1. This can prevent drooping. Thereby, when inserting the cutting tool 19 into the processing hole, there is an effect that the cutting tool 19 can be easily and reliably inserted into the processing hole. Furthermore, when inserting the cutter 19 held by the floating holder into a machined hole, even if the axis of the machined hole is misaligned with respect to the axis of the main body, the holding sleeve 17 is By moving in parallel, the cutting tool 19 can be smoothly inserted into the machined hole with a light force without applying excessive force. Also, when inserting the cutting tool 19 into a machined hole, the axis of the machined hole is
Even when the holding sleeve 17 is inclined with respect to the axis of the main body 1, the cutting tool 19 can be smoothly inserted into the machined hole with a light force without applying excessive force. be able to. Therefore, when the cutting tool 19 inserted into a machined hole is rotated relative to the workpiece to machine the machined hole as described above, the axis of the machined hole is misaligned with the axis of the main body 1. Even when the cutting tool 19 is tilted or tilted, it is possible to reduce the biasing force that the cutting tool 19 applies to the inner surface of the hole to be machined, which has the effect that the inner surface of the hole to be machined can be machined substantially uniformly and with high precision.

[Brief explanation of drawings]

The drawings show an embodiment of the present application, and FIG. 1 is a sectional view of the floating type holder, FIG. 2 is a sectional view taken along the - line,
Figure 3 is a sectional view taken along the - line, Figure 4 is a sectional view taken along the - line, Figure 5 is an explanatory diagram of the connecting shaft portion, Figures 6 and 7.
The figure is an explanatory diagram of the effect when the machined hole is misaligned.
FIGS. 8 and 9 are explanatory views of the effect when the machined hole is inclined, and FIG. 10 is a sectional view showing a different example of the elastic body. DESCRIPTION OF SYMBOLS 1...Main body, 2...Hollow hole, 4...Shank part (attachment part), 11...Socket surface, 13...Socket, 14...
... Contact surface, 17 ... Holding sleeve, 18 ... Hollow hole, 38 ... Contact surface, 41 ... Seat, 42 ... Coil spring (elastic body).

Claims (1)

[Claims] 1. A hollow body that has a mounting part on one end of the body that allows the body to be fixed to the main shaft of a machine tool, etc., and has a hollow hole inside that opens on the other end, and the above-mentioned body. A hollow retaining sleeve is located within the hollow hole and has a hollow hole therein which is opened on the same side as the opening side of the hollow hole of the main body and is capable of fixing a cutting tool such as a reamer, and further includes a hollow holding sleeve. A floating type holder, in which a base portion of the holding sleeve on the opposite side to the opening side is connected to a deep part of the hollow hole in the main body in a state in which it is relatively non-rotatable and movable in a direction perpendicular to the axis of the main body, A receiving surface is provided at the back of the hollow hole in the main body to receive the base of the holding sleeve so that the axis of the holding sleeve is approximately parallel to the axis of the main body, and the other end of the main body is A receiving seat is provided that extends toward the center from the inner circumferential surface of the hollow hole, and an annular contact surface centered on the axis of the main body is provided, and the base of the holding sleeve extends outward from the outer circumferential surface. A catch is provided and an annular contact surface centered on the axis of the holding sleeve is provided, and the space between the inner circumferential surface of the hollow hole of the main body and the outer circumferential surface of the holding sleeve is expandable and retractable in the axial direction of the main body. a cylindrical elastic body, one end of the elastic body is brought into contact with the seat and contact surface of the holding sleeve, and the other end of the elastic body is brought into contact with the seat and contact surface of the main body. A floating retainer characterized in that the base of the retaining sleeve is brought into elastic contact with the receiving surface of the main body so that the axis of the retaining sleeve coincides with the axis of the main body.