阅读说明：本技术 一种紧固件生产用机械手 (Manipulator is used in fastener production ) 是由 戚小乐 于 2021-09-02 设计创作，主要内容包括：本发明公开了一种紧固件生产用机械手,包括主箱体,主箱体内设有升降座滑动腔,升降座滑动腔内滑动配合有升降座,升降座内设置有螺母成型机构；本发明利用冲压芯柱固定胚料,通过模具向下运动冲压胚料,使得螺母外观成型,再利用转动模具将外观成型的螺母通过丝锥座在其内攻丝,使得冲压与攻丝两个工序中,本发明以机械手的方式固定螺母即可完成两个工序的作业,不仅降低了作业人员的劳动量,也加快了作业效率,同时避免了频繁夹取放置螺母,降低了作业人员被烫伤的风险,而且可更换不同直径的模具、冲压芯柱以及丝锥,使得本发明可适用于不用尺寸要求的螺母生产。(The invention discloses a manipulator for fastener production, which comprises a main box body, wherein a lifting seat sliding cavity is arranged in the main box body, a lifting seat is matched in the lifting seat sliding cavity in a sliding manner, and a nut forming mechanism is arranged in the lifting seat; the nut is fixed in a manipulator mode to finish the operation of the two working procedures, so that the labor amount of operators is reduced, the operation efficiency is improved, the frequent clamping and placing of the nut are avoided, the risk of scalding of the operators is reduced, the dies, the stamping core columns and the screw taps with different diameters can be replaced, and the nut production machine is suitable for nut production without size requirements.)

1. The utility model provides a manipulator is used in fastener production, includes the main tank body, its characterized in that: a lifting seat sliding cavity is arranged in the main box body, a lifting seat is in sliding fit in the lifting seat sliding cavity, and a nut forming mechanism is arranged in the lifting seat;

a clamping seat sliding cavity with a downward opening is formed in the lifting seat, a hydraulic sleeve is fixed in the upper end wall of the clamping seat sliding cavity, and a hydraulic rod is arranged in the hydraulic sleeve;

the nut forming mechanism comprises a clamping seat which forms a pair of sliding pairs with the sliding cavity of the clamping seat, a blocking block is arranged in the clamping seat, a lead screw is matched with the inner thread of the blocking block in a rotating mode, the inner end face of the clamping seat is matched with an annular rotating sleeve which is arranged in a central annular mode in a rotating mode, a mold is matched in the annular rotating sleeve in a sliding mode, and the nut forming mechanism is used for nut forming and thread forming in the nut forming mechanism.

2. A fastener producing robot as claimed in claim 1, wherein: the improved stamping die is characterized in that a left processing cavity, a right processing cavity, a front opening processing cavity, a stamping block, a core column sliding cavity, an upward opening core column, a stamping core column, a core column spring, a screw tap seat, a lifting seat sliding cavity upper side and a sliding block cavity are arranged in the main box body, the stamping block is internally fixed to the lower end wall of the processing cavity, the core column sliding cavity is internally provided with the stamping core column in a sliding fit mode, the lower end face of the stamping core column is fixed to the lower end wall of the core column sliding cavity, the screw tap seat is located in the lower end wall of the processing cavity, and the lifting seat sliding cavity upper side is communicated with the sliding block cavity.

3. A fastener producing robot as claimed in claim 2, wherein: the lifting seat is characterized in that a magnetic slider which extends upwards into the slider cavity and forms a pair of sliding pairs with the slider cavity is fixed on the upper end face of the lifting seat, a slider electromagnet is fixed on the right end wall of the slider cavity, a slider spring is fixed between the right end face of the magnetic slider and the left end face of the slider electromagnet, a hydraulic cylinder located on the left side of the hydraulic sleeve is fixed in the lifting seat, a hydraulic rod sliding cavity with a downward opening is arranged in the hydraulic sleeve, a pair of sliding pairs are formed between the hydraulic rod and the hydraulic rod sliding cavity, and a hydraulic oil pipe is communicated between the hydraulic cylinder and the hydraulic rod sliding cavity.

4. A fastener producing robot as claimed in claim 1, wherein: a blocking block sliding cavity positioned at the upper side of the mould is arranged in the clamping seat, the lower side of the blocking block sliding cavity is communicated with a rotating sleeve cavity with a downward opening, a pair of rotating pairs is formed between the annular rotating sleeve and the rotating sleeve cavity, a pair of sliding pairs is formed between the plugging block and the plugging block sliding cavity, the upper side of the blocking block sliding cavity is provided with a transmission belt cavity, the screw rod is arranged in the upper end wall of the blocking block sliding cavity through a bearing and extends upwards to the transmission belt cavity and downwards to the blocking block sliding cavity, the outer side of the rotating sleeve cavity is communicated with an annular gear cavity which is arranged by taking the plugging block as a center ring, be fixed with on the outer disc of annular rotating sleeve with the shutoff piece sets up and is located as central ring shape ring gear in the ring gear intracavity, ring gear chamber left side intercommunication is equipped with the initiative gear chamber.

5. A fastener producing robot as claimed in claim 4, wherein: a motor fixedly connected with the clamping seat is arranged at the lower side of the driving gear cavity, a motor shaft which extends upwards and penetrates through the driving gear cavity to the driving belt cavity is fixed on the upper end surface of the motor, a driving gear which is positioned in the driving gear cavity and is meshed with the annular gear is fixed on the motor shaft, a transmission belt is in power fit between the motor shaft and the screw rod, a reset torsion spring is fixed between the upper end surface of the screw rod and the upper end wall of the transmission belt cavity, a threaded cavity which is communicated from left to right and extends through the clamping seat and the lifting seat to the outside of the opening is arranged in the annular rotating sleeve, the threaded cavity is internally provided with a fastening nut which can be abutted against the outer circular surface of the die in a threaded fit mode, a nut forming cavity with a downward opening is arranged in the die, and the upper side of the nut forming cavity is communicated with a conical through cavity with an upward opening.

6. A fastener producing robot as claimed in claim 5, wherein: the toper leads to the inclined plane of intracavity wall for leaning out, the terminal inclined plane for the leanin of shutoff piece downside, shutoff piece downside end can with the complete butt of intracavity wall is led to the toper.

Technical Field

The invention relates to the technical field related to fastener processing, in particular to a manipulator for fastener production.

Background

The fastener is a mechanical part which is used for fastening connection and has wide application, and comprises twelve parts such as nuts, bolts, studs and the like. In the production process of nut wherein, need the manual work to place the mould with the heating stock, reuse punching machine presses it into the nut shape, utilizes the screw tap tapping after taking off, because need artifical frequent clamp to get the nut in the course of working, this incident that leads to probably appearing the operation personnel and being scalded, and the punching press is gone on step by step with the tapping moreover, this makes the operation personnel need do more and once to press from both sides the action of getting the nut of placing, has not only increased operation personnel's the amount of labour, also makes nut production time increase, and efficiency reduces.

Disclosure of Invention

The invention aims to provide a manipulator for producing fasteners, which is used for overcoming the defects in the prior art.

The manipulator for producing the fastener comprises a main box body, wherein a lifting seat sliding cavity is arranged in the main box body, a lifting seat is matched in the lifting seat sliding cavity in a sliding manner, and a nut forming mechanism is arranged in the lifting seat;

a clamping seat sliding cavity with a downward opening is formed in the lifting seat, a hydraulic sleeve is fixed in the upper end wall of the clamping seat sliding cavity, and a hydraulic rod is arranged in the hydraulic sleeve;

the nut forming mechanism comprises a clamping seat which forms a pair of sliding pairs with the sliding cavity of the clamping seat, a blocking block is arranged in the clamping seat, a lead screw is matched with the inner thread of the blocking block in a rotating mode, the inner end face of the clamping seat is matched with an annular rotating sleeve which is arranged in a central annular mode in a rotating mode, a mold is matched in the annular rotating sleeve in a sliding mode, and the nut forming mechanism is used for nut forming and thread forming in the nut forming mechanism.

Further technical scheme, be equipped with about in the main tank body and link up and the forward process chamber of opening, the end wall internal fixation has the punching press piece under the process chamber, be equipped with the ascending stem sliding chamber of opening in the punching press piece, stem sliding intracavity sliding fit has the punching press stem, under the punching press stem terminal surface with be fixed with the stem spring between the end wall under the stem sliding chamber, still be fixed with in the end wall under the process chamber and be located the screw tap seat on punching press piece right side, lift seat sliding chamber upside intercommunication is equipped with the slider chamber, screw tap seat up end is fixed with the screw tap for the tapping after the nut shaping.

In a further technical scheme, a magnetic slide block which extends upwards into the slide block cavity and forms a pair of sliding pairs with the slide block cavity is fixed on the upper end surface of the lifting seat, a slide block electromagnet is fixed on the right end wall of the slide block cavity, a slide block spring is fixed between the right end surface of the magnetic slide block and the left end surface of the slide block electromagnet, a hydraulic cylinder positioned on the left side of the hydraulic sleeve is fixed in the lifting seat, a hydraulic rod sliding cavity with a downward opening is arranged in the hydraulic sleeve, a pair of sliding pairs is formed between the hydraulic rod and the hydraulic rod sliding cavity, a hydraulic oil pipe is communicated between the hydraulic cylinder and the hydraulic rod sliding cavity, the power on and off of the slide block electromagnet can control the magnetic slide block to move left and right, the hydraulic oil pipe and the upper side of the hydraulic rod are filled with hydraulic oil, and the hydraulic rod is controlled to ascend and descend by starting and closing the hydraulic cylinder.

In the further technical proposal, a blocking block sliding cavity positioned at the upper side of the mould is arranged in the clamping seat, the lower side of the sliding cavity of the plugging block is communicated with a rotating sleeve cavity with a downward opening, a pair of rotating pairs is formed between the annular rotating sleeve and the rotating sleeve cavity, a pair of sliding pairs is formed between the plugging block and the plugging block sliding cavity, a transmission belt cavity is arranged on the upper side of the plugging block sliding cavity, the screw rod is arranged in the upper end wall of the blocking block sliding cavity through a bearing and extends upwards to the transmission belt cavity and extends downwards to the blocking block sliding cavity, the outer side of the rotating sleeve cavity is communicated with an annular gear cavity which is arranged by taking the plugging block as a center ring, be fixed with on the outer disc of annular rotating sleeve with the shutoff piece sets up and is located as central ring shape ring gear in the ring gear intracavity, ring gear chamber left side intercommunication is equipped with the initiative gear chamber.

A motor fixedly connected with the clamping seat is arranged on the lower side of the driving gear cavity, a motor shaft extending upwards and penetrating through the driving gear cavity to the transmission belt cavity is fixed on the upper end surface of the motor, a driving gear which is positioned in the driving gear cavity and meshed with the ring gear is fixed on the motor shaft, a transmission belt is in power fit between the motor shaft and the lead screw, a reset torsion spring is fixed between the upper end surface of the lead screw and the upper end wall of the transmission belt cavity, a threaded cavity which is communicated from left to right and extends through the clamping seat and the lifting seat to the outside of an opening is arranged in the annular rotating sleeve, a fastening nut capable of abutting against the outer circular surface of the mold is in threaded fit in the threaded cavity, a nut molding cavity with a downward opening is arranged in the mold, and a conical through cavity with an upward opening is communicated with the upper side of the nut molding cavity, the motor can drive the mould to rotate, so that the nut in the nut forming cavity rotates, and the nut can be tapped in the autorotation process.

Further technical scheme, the toper leads to the inclined plane of intracavity wall for leaning out, the terminal inclined plane for leanin of shutoff piece downside, shutoff piece downside end can with the toper leads to the complete butt of intracavity wall, the shutoff piece with when the toper leads to the chamber butt, nut one-tenth intracavity wall with the shutoff piece and can constitute a confined die cavity between the punching press piece to ensure nut punching press quality, but the shutoff piece upward movement for during the tapping, the screw tap seat can pass the toper leads to the chamber, can run through the nut when guaranteeing the screw tap, guarantees the tapping effect.

The invention has the beneficial effects that: the nut forming machine has the advantages that the blank is fixed by the aid of the stamping core column, the blank is stamped by downward movement of the die, so that the nut is formed in appearance, the nut formed in appearance is tapped in the nut forming machine by the aid of the rotary die through the screw tap, and in two working procedures of stamping and tapping, the nut is fixed in a manipulator mode, so that operation of the two working procedures can be completed, labor amount of operators is reduced, operation efficiency is improved, meanwhile, the nuts are prevented from being frequently clamped and placed, risks of scalding of the operators are reduced, the dies, the stamping core column and the screw tap with different diameters can be replaced, and the nut forming machine is suitable for nut production without size requirements.

Drawings

FIG. 1 is a schematic external view of the present invention;

FIG. 2 is a schematic view of the overall structure of a fastener production robot of the present invention;

FIG. 3 is an enlarged, fragmentary, schematic view of the mold section of FIG. 2 of the present invention;

FIG. 4 is a schematic view of A-A of FIG. 3 according to the present invention;

FIG. 5 is an enlarged, fragmentary schematic view of the belt assembly of FIG. 2 of the present invention.

In the figure:

10. a main box body; 11. a processing cavity; 12. a sliding cavity of the lifting seat; 13. a slider cavity; 20. stamping the blocks; 21. a stem sliding cavity; 22. a stem spring; 23. punching a core column; 24. a tap holder; 30. a lifting seat; 31. a clamping seat sliding cavity; 32. a hydraulic cylinder; 33. a hydraulic rod sliding chamber; 34. a hydraulic sleeve; 35. a hydraulic lever; 36. a magnetic slider; 37. a slider spring; 38. a slider electromagnet; 39. a hydraulic oil pipe; 40. a clamping seat; 41. a motor; 42. a motor shaft; 43. a plugging block sliding cavity; 44. a screw rod; 45. a plugging block; 46. a driving gear; 47. a drive gear cavity; 48. an annular gear cavity; 49. a ring gear; 410. a belt cavity; 411. a transmission belt; 412. a return torsion spring; 50. a mold; 51. a threaded cavity; 52. fastening a nut; 53. an annular rotating sleeve; 54. rotating the sleeve cavity; 55. a conical through cavity; 56. and a nut forming cavity.

Detailed Description

For purposes of making the objects and advantages of the present invention more apparent and the invention will be more clearly understood by reference to the following detailed description of the invention, taken in conjunction with the accompanying examples, it is to be understood that the following text is intended merely to describe one or more specific embodiments of the invention, and not to strictly limit the scope of the invention as specifically claimed, and that the terms up, down, left and right, as used herein, are not limited to their strict geometric definitions, but include tolerances which are reasonable and inconsistent with regard to machining or human error, the following detailed description of specific features of such a fastener production manipulator being set forth:

referring to the drawings, the manipulator for producing the fastener according to the embodiment of the invention comprises a main box body 10, wherein a lifting seat sliding cavity 12 is arranged in the main box body 10, a lifting seat 30 is in sliding fit in the lifting seat sliding cavity 12, and a nut forming mechanism is arranged in the lifting seat 30;

a clamping seat sliding cavity 31 with a downward opening is formed in the lifting seat 30, a hydraulic sleeve 34 is fixed in the upper end wall of the clamping seat sliding cavity 31, and a hydraulic rod 35 is arranged in the hydraulic sleeve 34;

nut forming mechanism including with the grip slipper slides chamber 31 and forms vice grip slipper 40 of a pair of slip, be provided with blocking piece 45 in the grip slipper 40, blocking piece 45 female thread fit has lead screw 44, terminal surface normal running fit has with blocking piece 45 rotates the cover 53 for the annular of central annular setting under the grip slipper 40, sliding fit has mould 50 in the annular rotates the cover 53, nut forming mechanism is used for the shaping of nut and the screw thread shaping in it.

Preferably, be equipped with in the main tank body 10 about link up and the forward process chamber 11 of opening, process chamber 11 lower end wall internal fixation has a punching press piece 20, be equipped with the ascending stem of opening slip chamber 21 in the punching press piece 20, stem slip chamber 21 sliding fit has a punching press stem 23, punching press stem 23 lower terminal surface with be fixed with stem spring 22 between the terminal wall under the stem slip chamber 21, still be fixed with in the process chamber 11 lower end wall be located the screw cone seat 24 on punching press piece 20 right side, the intercommunication of lift seat slip chamber 12 upside is equipped with slider cavity 13, screw cone seat 24 up end is fixed with the screw tap for the tapping after the nut shaping.

Preferably, a magnetic slider 36 which extends upwards into the slider cavity 13 and forms a pair of sliding pairs with the slider cavity 13 is fixed on the upper end surface of the lifting seat 30, a slider electromagnet 38 is fixed on the right end wall of the slider cavity 13, a slider spring 37 is fixed between the right end surface of the magnetic slider 36 and the left end surface of the slider electromagnet 38, a hydraulic cylinder 32 located on the left side of the hydraulic sleeve 34 is fixed in the lifting seat 30, a hydraulic rod sliding cavity 33 with a downward opening is arranged in the hydraulic sleeve 34, a pair of sliding pairs is formed between the hydraulic rod 35 and the hydraulic rod sliding cavity 33, a hydraulic oil pipe 39 is communicated between the hydraulic cylinder 32 and the hydraulic rod sliding cavity 33, the magnetic slider 36 can be controlled to move left and right by the power failure of the slider electromagnet 38, hydraulic oil is filled on the upper sides of the hydraulic oil pipe 39 and the hydraulic rod 35, the raising and lowering of the hydraulic rod 35 is controlled by the activation and deactivation of the hydraulic cylinder 32.

Preferably, be equipped with in the holder 40 and be located the shutoff piece sliding chamber 43 of the 50 upside of mould, shutoff piece sliding chamber 43 downside intercommunication is equipped with the decurrent rotation cover chamber 54 of opening, annular rotating sleeve 53 with form a pair of revolute pair between the rotation cover chamber 54, shutoff piece 45 with form a pair of sliding pair between the shutoff piece sliding chamber 43, shutoff piece sliding chamber 43 upside is equipped with drive belt chamber 410, lead screw 44 through the bearing install in the shutoff piece sliding chamber 43 upper end wall and upwards extend to in the drive belt chamber 410 downwards extend to in the shutoff piece sliding chamber 43, the rotation cover chamber 54 outside intercommunication is equipped with one the annular gear chamber 48 that shutoff piece 45 set up for central ring, be fixed with on the outer disc of annular rotating sleeve 53 with the shutoff piece 45 sets up and is located as central ring gear chamber 48 ring gear 49, the left side of the annular gear cavity 48 is communicated with a driving gear cavity 47.

Preferably, the lower side of the driving gear cavity 47 is provided with a motor 41 fixedly connected with the holder 40, the upper end surface of the motor 41 is fixed with a motor shaft 42 which extends upwards and penetrates through the driving gear cavity 47 to the transmission belt cavity 410, the motor shaft 42 is fixed with a driving gear 46 which is positioned in the driving gear cavity 47 and is engaged with the ring gear 49, a transmission belt 411 is arranged between the motor shaft 42 and the lead screw 44 in a power fit manner, a reset torsion spring 412 is fixed between the upper end surface of the lead screw 44 and the upper end wall of the transmission belt cavity 410, a threaded cavity 51 which is communicated from left to right and extends rightwards and penetrates through the holder 40 and the lifting seat 30 to the outside of the opening is arranged in the annular rotating sleeve 53, a fastening nut 52 which can be abutted against the outer circular surface of the mold 50 is arranged in the threaded cavity 51 in a screw-thread fit manner, a nut forming cavity 56 with the downward opening is arranged in the mold 50, the upper side of the nut forming cavity 56 is communicated with a conical through cavity 55 with an upward opening, and the motor 41 can drive the die 50 to rotate, so that the nut in the nut forming cavity 56 rotates, and the nut can be tapped in the autorotation process.

Preferably, the toper leads to the inclined plane of chamber 55 inner wall for leaning out, the terminal inclined plane that is the leanin of blocking piece 45 downside, blocking piece 45 downside end can with the toper leads to the complete butt in chamber 55 inner wall, blocking piece 45 with when the toper leads to chamber 55 butt, nut one-tenth die cavity 56 inner wall with blocking piece 45 and can constitute a confined die cavity between the punching press piece 20 to ensure nut punching press quality, blocking piece 45 upward movement for during the tapping, the screw tap can pass the toper leads to chamber 55, can run through the nut when ensuring the screw tap tapping, guarantees the tapping effect.

The invention relates to a manipulator for producing fasteners, which comprises the following working procedures:

in the initial state of the invention, the slide block electromagnet 38 is in a power-off state, the slide block spring 37 is in a compression state, the left end surface of the magnetic slide block 36 is attached to the left end wall of the slide block cavity 13, the left end surface of the lifting seat 30 is attached to the left end wall of the lifting seat sliding cavity 12, the upper end surface of the clamping seat 40 is attached to the upper end wall of the clamping seat sliding cavity 31, the core column spring 22 is in a release state, the stamping core column 23 extends out of the stamping block 20, the reset torsion spring 412 is in a release state, and the inclined plane of the tail end at the lower side of the plugging block 45 is abutted to the inner wall of the conical through cavity 55.

The heated annular blank is placed on the upper end face of the punch block 20 and the punch stem 23 passes through the annular blank.

At this time, the hydraulic cylinder 32 is started, so that the hydraulic cylinder 32 injects oil into the hydraulic rod sliding cavity 33 through the hydraulic oil pipe 39 and pressurizes, so that the hydraulic rod 35 moves downwards, the clamping seat 40 is driven to move downwards, the die 50 moves downwards, and the punch block 20 moves upwards relative to the die 50.

When the punching block 20 drives the annular blank to enter the nut forming cavity 56, the punching core column 23 abuts against the lower end face of the conical through cavity 55, the die 50 continues to move downwards, so that the punching core column 23 moves downwards under the driving of the conical through cavity 55, and the core column spring 22 is compressed, thereby enabling a complete die cavity to be formed among the punching block 20, the punching core column 23 and the die 50 in the process of punching and forming the annular blank.

After stamping forming, hydraulic cylinder 32 is reversed, so that hydraulic rod 35 moves up to the initial position, and then mold 50 moves up, and because the outer surface of the nut is tightly abutted against the inner wall of nut forming cavity 56, the friction force between the outer surface of the nut and nut forming cavity 56 is greater than the friction force between the nut and stamping stem 23, and thus when mold 50 moves up, the formed nut is driven to move up to be away from stamping stem 23.

The slider electromagnet 38 is started at this time, so that the slider electromagnet 38 electrically attracts the magnetic slider 36, and then the magnetic slider 36 moves rightwards by overcoming the elastic force of the slider spring 37, so that the lifting seat 30 is driven to move rightwards, the clamping seat 40 moves rightwards, the blocking block 45 is driven to move rightwards to a position right above the screw tap seat 24, and at this time, the central axis of the screw tap seat 24 coincides with the central axis of the nut middle hole.

At this point, the hydraulic cylinder 32 is again rotated in the forward direction so that the die 50 moves downwardly, thereby moving the nut downwardly together to close the tap seat 24.

During the lowering of the nut, the motor shaft 42 is driven by the starter motor 41 to rotate, which in turn drives the ring gear 49 to rotate, which in turn rotates the annular rotating sleeve 53 and thus the die 50.

Meanwhile, the motor shaft 42 rotates to drive the screw rod 44 to rotate through the transmission belt 411, so that the plugging block 45 moves upwards, and the screw rod 44 rotates to enable the reset torsion spring 412 to store power in a torsion mode.

When the upper end of the screw tap seat 24 touches the middle hole of the nut, the screw tap seat 24 drives the upper screw tap to tap in the middle hole of the nut because the die 50 rotates to drive the nut to rotate together and the die 50 drives the nut to move downwards.

In the process of tapping the screw tap upwards relative to the nut, the block 45 also moves upwards, thereby ensuring that the block 45 does not touch the upper end of the screw tap when the upper end of the screw tap passes through the nut, thereby ensuring that the nut can be completely tapped.

When tapping is completed, the motor 41 is turned off, so that the screw rod 44 rotates reversely under the torque force of the return torsion spring 412, so that the plugging block 45 moves downward, and simultaneously the screw rod 44 drives the motor shaft 42 to rotate reversely through the transmission belt 411, so that the die 50 rotates reversely.

And simultaneously, the hydraulic cylinder 32 is reversed, so that the die 50 moves upwards to the initial position, the nut is driven to rotate upwards to be far away from the screw cone seat 24, and the processed nut is taken down from the nut forming cavity 56 by utilizing the clamp.

The slider electromagnet 38 is turned off, so that the magnetic slider 36 is moved leftward to the initial position by the elastic force of the slider spring 37.

If nuts with different sizes need to be machined, an internal hexagonal wrench is inserted into the fastening nut 52 through the threaded cavity 51, the fastening nut 52 is rotated, the fastening nut 52 moves rightwards to be far away from the outer surface of the mold 50, the mold 50 is taken down, the molds 50 with different diameters are replaced, the molds 50 are reinstalled into the annular rotating sleeve 53, and then the fastening nut 52 is screwed down.

While replacing punch blocks 20 and tap bases 24 of different diameters.

It will be apparent to those skilled in the art that various modifications may be made to the above embodiments without departing from the general spirit and concept of the invention. All falling within the scope of protection of the present invention. The protection scheme of the invention is subject to the appended claims.