JP5061118B2 - Tap holder - Google Patents

Description

  The present invention relates to a tap holder that holds a tapping tap on a spindle of a machine tool.

  When tapping is performed by using the synchronization between the axis feed and rotation of the machine spindle in a machine tool, the rotation of the spindle and the amount of movement of the axis feed are controlled to synchronize with the tap pitch. However, in actual machining, due to a phenomenon called servo delay, etc., the amount of self-running while the tap cuts and rotates relative to the rotation of the main shaft increases or conversely decreases. Due to the discrepancy between the feed and rotation, the tap progresses early or late, resulting in a deviation in the tap pitch. In the past, floats were provided on both sides of the tap holder in the axial direction to prevent this, but in recent years, with the development of mechanisms and control technology, the synchronization (synchronization) accuracy of rotation and shaft feed has improved, The float is eliminated and the structure is integrated.

  The tap holder is separated into a tapper body and a tap collet, and the tap collet is adapted to allow the tap size. The synchronization tap holder for the purpose of complete synchronization is also separated into a tapper body and a tap collet so that the tapper body can be attached as much as possible when connecting the tapper body and the tap collet.

  However, although the synchronization accuracy of the machine tool is improved, for example, when the axis feed direction and the rotation direction are switched in order to extract the tap from the workpiece, the rotation of the spindle is not synchronized with the axis feed of the spindle, and the tap axis Since the occurrence of minute movement in the direction cannot be completely eliminated, there has been a problem that the hole of the tap is enlarged or the thread is thinned.

  As a configuration for absorbing such a synchronization error, the main shaft mounting portion and the tap mounting portion are connected via a leaf spring so that the tap mounting portion can be moved in the rotation axis direction of the main shaft (see Patent Document 1 below). In the same way as in the prior art, the tension spring and the compression spring are urged in opposite directions in the axial direction between the main shaft and the tap collet at a position where the urging forces are balanced. When the tap collet is stopped and a feed error of the spindle occurs during tapping and the feed amount and the tap pitch do not match, the pitch is made minute in the direction to match the external force from the tap at the tip. The tap driver may be provided with a helical coil having compressibility and extensibility, and may be slid (see Patent Document 2, paragraph number [0030], FIG. 2). In response to a predetermined force applied to the flop it is moved a small amount of the attachment body in the axial direction, and to synchronize (Patent Document 3, paragraph [0018], see FIG. 2) configured like have been proposed.

  However, the configurations described in Patent Documents 1 to 3 have a problem that the structure is complicated and the cost is high in any case.

  In Patent Document 4 below, a lock bolt is used to lock the tap to the tap holding shaft, and a fixing pin that comes into contact with the outer peripheral surface of the handle portion at a position opposed to the lock bolt and a tap holding shaft are provided. The inner wall of the elongated hole is filled with an elastically deformable bush, and the fixing pin and the lock ring can be swung in the circumferential direction with respect to the tap holding shaft, and the axial fixing pin and the inner wall of the elongated hole A tap holding device filled with the bush is also described in the gap (page 8, line 14 to page 9, line 10). However, such a tap holding device has a rotational force on the lock bolt and a force in the pushing direction of the tap. This prevents the lock bolt from loosening and does not suppress the synchronization error between the spindle feed and rotation.

  That is, the fixing pin provided with the bush is in contact with and locked to the outer peripheral surface of the tap on which an axial force acts when a synchronization error occurs between the feed and rotation of the spindle of the machine tool. Even if the axial force acting on the pin is not sufficiently transmitted to the fixing pin and a bush that can be elastically deformed is disposed in front of the fixing pin in the pushing direction, the amount of movement of the tap holding shaft and the amount of self-running of the tap It is not possible to absorb the difference.

In Patent Document 5 below, the first member and the second member are connected by a connection pin and a ring-shaped elastic member, and the reverse rotation clutch and the connection member (key member) are connected by a connection pin and an elastic member. (See paragraphs [0009] and [0018] FIGS. 3 and 7). However, the elastic member disposed on any of the connecting pins is for reducing the impact when the forward rotation clutch is engaged, or for absorbing an attachment error between the connection member and the reverse rotation clutch. It does not suppress the synchronization error between shaft feed and rotation.
Japanese Patent Laid-Open No. 7-60544 JP 2004-142033 A JP 2002-46020 A Japanese Utility Model Publication No.59-8725 JP 2000-61729 A

  The present invention has been made in consideration of the above points, and in a configuration in which a tap holder corresponding to a spindle of a machine tool is separated into a tapper body and a tap collet, the feeding and rotation of the spindle of the machine tool are synchronized. An object of the present invention is to provide a tap holder that can absorb and synchronize the error between the tapper main body and the tap collet with a simple configuration even if an error occurs.

  A tap collet according to the present invention includes a tap collet that grips a tap at one end, and a tapper body that receives the outer surface of the other end of the tap collet in the axial direction and fixes the tap collet so as not to rotate. In a tap holder attached to a machine, the tap collet and the tapper main body are inserted by a locking member at a portion where the tap collet and the tapper main body are overlapped, and the locking member includes the tap collet and the tapper main body. The tap collet is fixed to the tapper body by engaging with at least one of the first and second elastic members on both sides in the axial direction.

  According to the present invention, a slight movement in the axial direction is generated between the tapper main body and the tap collet, so that an error in synchronization between the axis feed and the rotation in the spindle of the machine tool can be absorbed with a simple configuration. Can do.

  Moreover, there are few basic components of a tapper main body, a tap collet, a locking member, and an elastic body, and it is highly productive with a simple structure and can be manufactured at low cost.

  Furthermore, by exchanging the elastic member, it is easy to cope with differences in tap size, work material, wear and aging.

(First embodiment)
Hereinafter, a first embodiment of the present invention will be described with reference to the drawings.

  1 is a cross-sectional view of a tap holder 10 according to a first embodiment of the present invention, FIG. 2 is an enlarged cross-sectional view of a main part of the tap holder 10, FIG. 3 is a cross-sectional view taken along line AA of FIG. FIG. 10 is an exploded view of FIG.

  The tap holder 10 according to the present embodiment is a tap holder for mounting the tap 40 on a machine tool having a tap synchronous feed mechanism, and includes a shank portion 22 that is detachably mounted on the spindle 1 of the machine tool. A tap collet 50 having a tapper body 20, a tap holding member 42 for holding the tap 40 at the tip, and being detachably attached to the tapper body 20; and a locking member for fixing the tap collet 50 to the tapper body 20. 70.

  In the tapper body 20, an outer cylinder part 24 is provided integrally with the shank part 22 on the tip side, and an attachment recess 26 for inserting the shaft part 52 of the tap collet 50 is formed in the outer cylinder part 24. Through holes 28, 28 penetrating from the outer surface of the outer cylinder part 24 to the mounting recess 26 are formed in the radial direction of the outer cylinder part 24.

  Further, a flow path 30 for pumping the cutting fluid is formed inside the tapper body 20, and this flow path 30 is open to the mounting recess 26.

  The tap collet 50 includes a shaft portion 52 that is slid and inserted while being in close contact with the inner peripheral surface of the mounting recess 26 of the tapper body 20, and a flange portion 54 that is provided on the distal end side of the shaft portion 52. Prepare.

  The shaft portion 52 is provided with a through-hole 56 that penetrates in the radial direction at a position corresponding to the through-hole 28 provided in the tapper body 20, and the shaft portion 52 is inserted into the mounting recess 26 to penetrate the tapper body 20. The hole 28 and the through-hole 56 in the tap collet 50 communicate with each other, so that the locking member 70 can be inserted through the outer cylinder portion 24 and the shaft portion 52 where the tap collet 50 and the tapper body 20 overlap.

  The locking member 70 includes a male screw portion 72 and a locking shaft portion 74 formed on the distal end side of the male screw portion 72 and inserted through the through holes 28 and 56. A plurality of groove-shaped first concave portions 76 that are continuous in the circumferential direction are formed on the peripheral surface of the locking shaft portion 74 at predetermined intervals in the axial direction of the locking shaft portion 74. An elastic body 78 is disposed so as to protrude outward from the stop shaft portion 74. The elastic body 78 is an annular member formed of a synthetic resin having elasticity such as nylon or rubber, and is detachably disposed with respect to the locking member 70.

  In such a locking member 70, the male screw portion 72 is screwed with the female screw portion 32 provided on the inner peripheral surface of the through hole 28 in a state where the engaging shaft portion 74 is inserted into the through holes 28 and 56. Thus, the tap collet 50 is engaged with the locking member 70 with the elastic bodies 78 interposed on both sides in the axial direction of the tap collet 50 indicated by the arrow X, and the tapper body 20 It is fixed so that it cannot rotate.

  A plurality of resin balls 60 are disposed on the end surface 52a of the shaft portion 52 facing the bottom surface 26a of the mounting recess 26 so as to protrude from the end surface 52a. Are in contact with each other. The plurality of resin balls may be one O-ring.

  As shown in FIG. 3, a flow path 62 for pumping the cutting fluid is formed in the tap collet 50, and an opening communicating with the flow path 62 is provided on the outer peripheral surface of the shaft portion 52. A pair of O-rings 66 are disposed on the outer peripheral surface of the shaft 52 with the opening interposed therebetween, and the flow formed in the tap collet 50 in a state where the tap collet 50 is connected and fixed to the tapper body 20. The path 62 communicates with the flow path 30 formed inside the tapper main body 20, and the cutting fluid supplied from the machine tool side through this is pressure-fed to the cutting edge portion of the tap 40.

  A protrusion 68 that engages with the key groove 34 formed on the opening edge of the recess 26 is provided on the flange portion 54 on the side of the tapper body 20, so as to prevent the tap collet 50 from being displaced relative to the tapper body 20. It has become.

  As described above, in the tap holder 10 according to the present embodiment, the locking shaft portion 74 inserted through the through hole 56 of the tap collet 50 has the elastic bodies 78 on both sides in the axial direction of the tap collet 50 indicated by the arrow X. Since the tap collet 50 is engaged with the tap collet 50 being interposed, a force in either the pushing direction or the pulling direction is generated with respect to the tap collet 50 due to a synchronization error between the feed and rotation of the spindle 1 of the machine tool. Will also act on the locking member 74 via the elastic body 78, and the elastic body 78 will be elastically deformed to absorb the difference between the amount of movement of the tapper body 20 and the amount of self-running of the tap 40, and a highly accurate tapping process. Can be done.

  Further, since the elastic body 78 is fitted in the first recess 76 and is detachably disposed, it can be replaced with a new elastic body 78 when the elastic body 78 is worn and deteriorated. Can be maintained, and by attaching an elastic body 78 of different hardness to the first recess 76, the flexibility of the elastic body 78 can be adjusted, and the tap holder 10 suitable for processing various materials can be obtained. Can do.

  In the present embodiment, the elastic body 78 is disposed in all of the plurality of first recesses 76 provided in the locking shaft portion 74. However, as illustrated in FIG. By arranging the body 78 and changing the quantity of the elastic body 78 interposed between the locking shaft portion 74 and the tap collet 50, the flexibility of the elastic body 78 can be adjusted. A suitable tap holder 10 can be obtained.

  In the present embodiment, a plurality of first concave portions 76 are provided in the engagement shaft portion 74, and one elastic body 78 is provided in each first concave portion 76. However, the present invention is not limited to this. For example, as shown in FIGS. 6 and 7, a plurality of elastic bodies 78 may be disposed in one first recess 76.

  Furthermore, in this embodiment, the locking shaft portion 74 is engaged with the tap collet 50 via the elastic body 78, but the elastic body 78 is interposed on both sides of the tapper body 20 and the axial direction indicated by the arrow X. You may engage in the state made.

(Second Embodiment)
A second embodiment will be described with reference to FIGS. Elements that are the same as or correspond to those in the first embodiment described above are assigned the same reference numerals, and redundant descriptions are omitted. 8 to 10 are enlarged cross-sectional views of the main part of the tap holder 10 according to the present embodiment.

  In the first embodiment described above, the elastic body 78 is disposed in the first recess 76 provided in the locking member 70, but the tap holder 10 of this embodiment is elastic between the locking shaft portion 74 and the tap collet 50. An elastic unit 80 including a body 82 is interposed.

  Specifically, the elastic body unit 80 includes, for example, a cylindrical tube member 84 formed of a material having higher rigidity than the elastic body 82 such as the same material as the tap collet 50, and an elastic member disposed on the tube member 84. A body 82, which is detachably fitted in a through hole 56 provided in the shaft portion 52 of the tap collet 50, so that the locking shaft portion 74 of the locking member 70 is inserted into the hollow portion 88 of the cylindrical member 84. It has become.

  As shown in FIGS. 8 to 10, the elastic body unit 80 is continuous with one of the inner peripheral surface and the outer peripheral surface of the cylindrical member 84, or both peripheral surfaces in the circumferential direction, and is in the axial direction. A plurality of second recesses 86 may be provided at predetermined intervals, and the elastic body 82 may be disposed in the second recesses 86.

  As described above, even in the tap holder 10 according to the present embodiment, the elastic body 82 is elastically deformed to absorb the difference between the amount of movement of the tapper body 20 and the amount of self-running of the tap 40 and perform highly accurate tapping. Can be done.

  Further, by providing the second recess 86 in which the elastic body 82 is disposed only on the outer peripheral surface of the cylindrical member 84, even if the locking member 70 is inserted and removed when the tap collet 50 is replaced, the locking shaft 74 is elastic. Since the bodies do not rub against each other directly, the durability of the elastic body 82 is improved.

(Third embodiment)
Next, a third embodiment will be described with reference to FIG. Elements that are the same as or correspond to those in the first embodiment and the second embodiment described above are assigned the same reference numerals, and redundant descriptions are omitted. FIG. 11 is an enlarged cross-sectional view of a main part of the tap holder 10 according to the present embodiment.

  The feature of this embodiment is that the tap collet 50 is provided with an elastic body that absorbs the difference between the amount of movement of the tapper body 20 and the amount of self-running of the tap 40.

  That is, as shown in FIG. 11, the shaft portion 52 of the tap collet 50 is provided with a third recess 90 that penetrates in the radial direction at a position corresponding to the through hole 28 provided in the tapper body 20. By inserting the portion 52 into the mounting recess 26, the through hole 28 in the tapper body 20 and the third recess 90 in the tap collet 50 communicate with each other.

  A cylindrical elastic body 92 formed of a synthetic resin having elasticity such as nylon or rubber or the like is detachably fitted into the third recess 90 formed in the shaft portion 52, and the hollow portion 94 of the elastic body 92 is formed. An elastic body 92 is disposed in the third recess 90 so as to communicate with the through hole 28 formed in the outer cylinder portion 24. The elastic body 92 is pressed and fixed by a bolt 96 penetrating from the end surface 52 a of the shaft portion 52 to the third recess 90.

  The locking shaft portion 74 of the locking member 70 is inserted into the through-hole 28 formed in the outer cylinder portion 24 and the hollow portion 94 of the elastic body 92 in a tight contact state, and the male screw portion of the locking member 70 is inserted. The locking member 70 is fixed to the tapper main body 20 by screwing 72 into a female screw portion 32 provided on the inner peripheral surface of the through hole 28. As a result, the tap collet 50 engages with the locking member 70 with the elastic bodies 92 interposed on both sides in the axial direction indicated by the arrow X, and is fixed to the tapper body 20 so as not to rotate.

(Modification 1 of 3rd Embodiment)
Modification 1 of this embodiment will be described with reference to FIGS. 12 and 13. Elements that are the same as or correspond to those in the above-described embodiment are given the same reference numerals, and redundant descriptions are omitted. FIG. 12 is an enlarged cross-sectional view of the main part of the tap holder 10 according to this modification, and FIG. 13 is a cross-sectional view taken along line BB in FIG.

  A difference from the above-described embodiment is that the third recess 90 formed in the shaft portion 52 of the tap collet 50 does not penetrate the shaft portion 52.

  That is, as shown in FIGS. 12 and 13, a plurality of (for example, three) third concave portions 90 are arranged at equal intervals in the circumferential direction without penetrating the shaft portion 52, and Is fitted with a cylindrical elastic body 92. A plurality of through holes 28 are also formed in the outer cylinder portion 24 corresponding to the third recesses 90 so as to communicate with the hollow portions 94 of the elastic bodies 92. By inserting the locking shaft portion 74 of the locking member 70, the tap collet 50 and the locking member 70 are engaged via the elastic body 92 on both sides in the axial direction indicated by the arrow X, so that the tap collet 50 is connected to the tapper body. Fix to 20.

(Modification 2 of 3rd Embodiment)
Modification 2 of the present embodiment will be described with reference to FIG. Elements that are the same as or correspond to those in the above-described embodiment are given the same reference numerals, and redundant descriptions are omitted. FIG. 14 is an enlarged cross-sectional view of a main part of the tap holder 10 according to this modification.

  As shown in FIG. 14, the feature of the present modification is that a side surface 92 a of a cylindrical elastic body 92 that fits into a third recess 90 formed in the shaft portion 52, for example, an inner wall 90 a that defines the third recess 90. The contact surface is uneven.

  In this way, by providing the side surface 92a of the elastic body 92 on the uneven surface, the contact area between the tap collet 50 and the elastic body 92 can be changed, and the flexibility of the elastic body 92 can be easily adjusted. By exchanging 92, the tap holder 10 suitable for processing of various materials can be obtained. In this modified example, the uneven surface is provided on the side surface 92a which is the outer periphery of the elastic body 92, but it may be provided only on the inner periphery or on both side surfaces.

  Further, the tap collet 50 and the elastic body when the force in the pushing direction acts on the tap collet 50 and when the force in the pulling direction acts on the tap collet 50 on the front side and the rear side of the tap collet 50. The contact area with 92 may be changed, whereby the ease of bending of the elastic body 92 with respect to the force in the pushing direction and the force in the pulling direction of the tap collet 50 can be adjusted separately.

(Modification 3 of 3rd Embodiment)
Modification 3 of the present embodiment will be described with reference to FIG. Elements that are the same as or correspond to those in the above-described embodiment are given the same reference numerals, and redundant descriptions are omitted. FIG. 15 is a cross-sectional view of the tap holder 10 according to this modification.

  The feature of this modified example is that an elastic body 92 is disposed on the tapper body 20.

  That is, as shown in FIG. 15, a plurality of (three in this embodiment) third recesses 90 are arranged in the outer cylinder portion 24 of the tapper body 20 in the circumferential direction without penetrating the outer cylinder portion 24. It is installed. A cylindrical elastic body 92 is fitted in each third recess 90, and a hollow portion 94 of the elastic body 92 is a stop provided at a position corresponding to each third recess 90 in the shaft portion 52 of the tap collet 50. It communicates with the hole 66. By inserting the locking shaft portion 74 of the locking member 70 into the blind hole 66 formed in the shaft portion 52 and the hollow portion 94 of the elastic body 92, the elastic body 92 is interposed on both sides in the axial direction indicated by the arrow X. The tap collet 50 and the locking member 70 are engaged to fix the tap collet 50 to the tapper body 20.

(Modification 4 of 3rd Embodiment)
Modification 4 of the present embodiment will be described with reference to FIGS. Elements that are the same as or correspond to those in the above-described embodiment are given the same reference numerals, and redundant descriptions are omitted. 16 is an enlarged cross-sectional view of the main part of the tap holder 10 according to this modification, FIG. 17 is a cross-sectional view taken along the line CC of FIG. 16, and FIGS. 18 to 20 are views of the tap collet 50 with the locking member 70 inserted therethrough. It is a fragmentary sectional view.

  The feature of this modified example is that a gap 98 serving as a clearance for the deformed elastic body 92 is provided between the elastic body 92 and the locking member 70.

  Specifically, as illustrated in FIGS. 16 and 17, the gap 98 forms an inner diameter of the hollow portion 94 of the elastic body 92 that is larger than the outer diameter of the locking shaft portion 74, and the bolt 96 is connected to the elastic body 92. It is formed by pressing the outer peripheral surface and bending the elastic body 92.

  This gap 98 serves as a clearance for the elastic body 92 that is elastically deformed due to a synchronization error between the feed and rotation of the spindle 1 of the machine tool. Therefore, for example, the flexibility of the elastic body 92 can be adjusted by changing the size of the gap 98, for example, by changing the size of the hollow portion 94, and the tap holder is suitable for processing various materials. 10 can be obtained.

  Moreover, the contact area between the locking shaft portion 74 and the elastic body 92 can be made different between when the force in the pushing direction is applied to the tap collet 50 and when the force in the pulling direction is applied. The ease of bending of the body 92 can be individually adjusted.

  In addition to this modification, for example, a substantially concentric cylindrical elastic body 92 is provided in the third recess 90 provided with an elliptical cross-sectional shape as shown in FIGS. 18 to 20 or a triangular shape with rounded corners. A gap 98 may be formed between the locking shaft portion 74 and the elastic body 92. Thus, since the cross-sectional shape of the hollow part 94 can also be changed by changing the cross-sectional shape of the third recess 90, a force in the pushing direction and a force in the pulling direction act on the tap collet 50. Depending on the case, the contact area between the locking shaft 74 and the elastic body 92 can be changed, and the ease of bending of the elastic body 92 in each case can be adjusted separately.

(Modification 5 of 3rd Embodiment)
Modification 5 of this embodiment will be described with reference to FIGS. Elements that are the same as or correspond to those in the above-described embodiment are given the same reference numerals, and redundant descriptions are omitted. 21 to 23 are partial cross-sectional views of the tap collet 50 in a state where the locking member 70 is inserted.

  In this modified example, as illustrated in FIGS. 21 to 23, the locking shaft portion 74 and the tap collet 50 on one side in the axial direction indicated by the arrow X (in this modified example, on the front side in the pushing direction of the tap collet 50). Elastic body 92 interposed between the shaft portion 52 and the shaft portion 52 of the tap collet 50 on the other side (in the present modification, the rear side of the tap collet 50 in the pushing direction). It is formed thicker than the interposed elastic body 92. Thereby, the easiness of bending of the elastic body 92 can be adjusted separately when the force in the pushing direction acts on the tap collet 50 and when the force in the pulling direction acts.

  In this modification, the elastic body 92 on the front side in the pushing direction of the tap collet 50 is provided with a thick wall, but the elastic body 92 on the rear side in the pushing direction of the tap collet 50 may be provided with a thick wall.

It is sectional drawing of the tap holder which concerns on 1st Embodiment of this invention. It is a principal part expanded sectional view of the tap holder which concerns on 1st Embodiment of this invention. It is the sectional view on the AA line of FIG. It is an exploded view of the tap holder which concerns on 1st Embodiment of this invention. It is a principal part expanded sectional view of the tap holder which concerns on the example of a change of 1st Embodiment of this invention. It is a principal part expanded sectional view of the tap holder which concerns on the example of a change of 1st Embodiment of this invention. It is a principal part expanded sectional view of the tap holder which concerns on the example of a change of 1st Embodiment of this invention. It is a principal part expanded sectional view of the tap holder which concerns on 2nd Embodiment of this invention. It is a principal part expanded sectional view of the tap holder which concerns on the example of a change of 2nd Embodiment of this invention. It is a principal part expanded sectional view of the tap holder which concerns on the example of a change of 2nd Embodiment of this invention. It is a principal part expanded sectional view of the tap holder concerning 3rd Embodiment of this invention. It is a principal part expanded sectional view of the tap holder which concerns on the modification 1 of 3rd Embodiment of this invention. It is BB sectional drawing of FIG. It is a principal part expanded sectional view of the tap holder which concerns on the modification 2 of 3rd Embodiment of this invention. It is sectional drawing of the tap holder which concerns on the modification 3 of 3rd Embodiment of this invention. It is a principal part expanded sectional view of the tap holder which concerns on the modification 4 of 3rd Embodiment of this invention. It is CC sectional drawing of FIG. It is a fragmentary sectional view of the tap collet in the state where the locking member which shows example 4 of a change of a 3rd embodiment of the present invention was inserted. It is a fragmentary sectional view of the tap collet in the state where the locking member which shows example 4 of a change of a 3rd embodiment of the present invention was inserted. It is a fragmentary sectional view of the tap collet in the state where the locking member which shows example 4 of a change of a 3rd embodiment of the present invention was inserted. It is a fragmentary sectional view of the tap collet in the state where the locking member which shows modification 5 of a 3rd embodiment of the present invention was penetrated. It is a fragmentary sectional view of the tap collet in the state where the locking member which shows modification 5 of a 3rd embodiment of the present invention was penetrated. It is a fragmentary sectional view of the tap collet in the state where the locking member which shows modification 5 of a 3rd embodiment of the present invention was penetrated.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Main axis | shaft 10 ... Tap holder 20 ... Tapper main body 22 ... Shank part 24 ... Outer cylinder part 26 ... Mounting recessed part 28 ... Through hole 40 ... Tap 50 ... Tap collet 52 ... Shaft part 56 ... Through hole 66 ... Blind hole 70 ... Engagement Stop member 74 ... locking shaft 76 ... first recesses 78, 82, 92 ... elastic body 86 ... second recess 90 ... third recess

Claims (10)

In a tap holder attached to a machine tool having a tap synchronous feed mechanism, comprising a tap collet that grips a tap at one end and a tapper body that receives the other outer surface side of the tap collet in the axial direction and fixes the tap collet so as not to rotate.
In the portion where the tap collet and the tapper main body overlap, the tap collet and the tapper main body are inserted with a locking member,
The tap is characterized in that the locking member engages with at least one of the tap collet and the tapper main body with an elastic body interposed on both sides in the axial direction, and fixes the tap collet to the tapper main body. holder. The locking member includes a first concave portion on a peripheral surface of a locking shaft portion inserted through the tap collet and the tapper body, and the elastic body is disposed in the first concave portion. Item 2. The tap holder according to Item 1. The tap holder according to claim 2, wherein the first recess is formed continuously in a circumferential direction of the locking shaft portion. The tap holder according to claim 2 or 3, wherein a plurality of the first recesses are formed at intervals in the axial direction of the locking shaft portion. An elastic body unit including a cylindrical member having a second recess formed in at least one of the inner peripheral surface and the outer peripheral surface and an elastic body disposed in the second recess is inserted into at least one of the tap collet and the tapper body. ,
The tap holder according to claim 1, wherein the locking member is inserted into a hollow portion of the cylindrical member. The tap holder according to claim 1, wherein a third recess is provided in at least one of the tap collet and the tapper body, and the elastic body is disposed in the third recess. The tap holder according to claim 6, wherein the third recess is provided through the tap collet. The tap holder according to claim 6 or 7, wherein the elastic body has an uneven surface at a contact surface between the locking member and at least one of the tap collet and the tapper body. An elastic body interposed between the locking member and at least one of the tap collet and the tapper main body on one side in the axial direction, and the locking member, the tap collet and the tapper on the other side in the axial direction. The tap holder according to any one of claims 6 to 8 , wherein the tap holder is formed thicker than an elastic body interposed between at least one of the main bodies. Tap holder according to any one of claims 1 to 9, characterized in that said elastic member is disposed interchangeably.

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