An adjustable self-adaptive tapping chuck

Abstract

The utility model relates to the technical field of tapping instruments, and in particular to an adjustable adaptive tapping chuck, comprising a tapping chuck body, a tap, an upper ejector pin, an upper spring, a lower ejector pin, a lower spring, a hollow sleeve, a pre-tightening screw, a plurality of ball bearings, a plurality of spacer sleeves and a plurality of O-rings, the axial connection of the tapping chuck body is provided with an embedding hole, a non-circular hole, a lower sliding hole, a lower cavity, a floating space, an upper cavity, an upper sliding hole and a threaded hole, the radial direction of the tapping chuck body is provided with a plurality of floating slide grooves connected with the floating space, the heads of the upper ejector pin and the lower ejector pin are both provided with an arc-shaped annular groove, the tail of the tap is provided with a non-cylinder, and an active gap is provided between the inner wall of the non-circular hole and the outer wall of the non-cylinder. The tap of the present application can make adaptive radial swing and axial sliding when tapping to ensure that the tapping can be completed smoothly, the tapping quality is good, the tap is not easily damaged, the tapping speed can be increased, and the pre-tightening pressure of the tap is adjustable.

Description

Technical Field

[0001] The utility model relates to the technical field of tapping tools, in particular to an adjustable and self-adaptive tapping chuck. Background Art

[0002] The material of the tap is tool steel or cemented carbide. The teeth used for cutting are sharp and hard, the structure is fragile, and the tooth tips are easily broken.

[0003] The tapping action is that the tap rotates and the axial direction moves synchronously with the pitch of the thread. The ideal state is complete synchronization, and the cutting teeth of the tap are not affected by the displacement other than the cutting action, so as to obtain a complete thread shape and the tap will not be abnormally damaged.

[0004] When the CNC machine tool is tapping, the spindle rotates and the Z axis moves according to the lead at the same time. In actual operation, the error of the CNC system's own drive and the Z-direction feed and rotation caused by the machine tool transmission gap are accumulated as axial transmission errors, which cause hard extrusion or hard stretching of the taps; the spindle rotation accuracy, the matching accuracy of the tool holder and the spindle, and the accuracy of the tool holder itself in installing the taps are accumulated as rotation accuracy errors, which cause uneven radial hard extrusion of the taps. The errors in these two directions have a direct impact on the tapping accuracy, the cutting life of the taps, and the processing efficiency.

[0005] Among the existing patents, the Chinese patent document with application number 201420685668.X discloses a quick-change flexible tap chuck, comprising a main handle and a chuck with a cylindrical clamping body, a stopper for the tap is arranged on the chuck, the stopper can move radially and axially along the clamping body, an axially deformable elastic component is arranged in the chuck, the stopper comprises a toggle sleeve that can move axially along the clamping end body and a ball that is arranged through the clamping body wall and can move radially along the clamping body end, and a stopper is arranged on the clamping end of the tap. The groove for ball matching has multiple through holes arranged at equal intervals along the circumference of the clamping body wall, the ball is arranged in the through hole, the toggle jacket is composed of a space for accommodating the ball and a protrusion that matches the ball, the jacket is provided with a spring for axial movement of the toggle jacket, the cross section of the toggle jacket is a T-shaped structure, the jacket is provided with a baffle for limiting the ball accommodating space, the jacket is provided with a retaining spring for the toggle jacket, the elastic component is a spring, and the spring is fixed in the blind end of the cylindrical clamping body. Although the tap in the patent document can slide axially, it cannot achieve adaptive radial swing, nor can it adjust the size of the preload pressure, making it difficult to ensure the quality and stability of tapping.

[0006] Therefore, the defects are very obvious and a solution is urgently needed. Utility Model Content

[0007] In order to solve the above technical problems, the purpose of the utility model is to provide an adjustable and adaptive tapping chuck.

[0008] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0009] An adjustable adaptive tapping chuck comprises a tapping chuck body, a tap, an upper ejector pin, an upper spring, a lower ejector pin, a lower spring, a hollow sleeve, a pre-tightening screw, a plurality of ball bearings, a plurality of spacer sleeves and a plurality of O-rings. The axial connection of the tapping chuck body is provided with an embedding hole, a non-circular hole, a lower sliding hole, a lower cavity, a floating space, an upper cavity, an upper sliding hole and a threaded hole. The radial direction of the tapping chuck body is provided with a plurality of floating slide grooves connected with the floating space. The floating slide grooves extend along the axial direction of the tapping chuck body. A plurality of spacer sleeves and a plurality of O-rings are embedded in the embedding hole at intervals. The hollow sleeve is slidably arranged in the upper sliding hole. The pre-tightening screw is threadedly connected with the threaded hole. The inner end of the pre-tightening screw contacts the upper end of the hollow sleeve. The shaft of the upper ejector pin is slidably inserted into the inner hole of the hollow sleeve. The upper spring sleeve is arranged outside the upper ejector pin and is located in the upper cavity. The two ends of the upper spring are respectively connected to the lower end and The head of the upper ejector pin elastically contacts with each other, and the shaft of the lower ejector pin is slidably inserted into the lower sliding hole and is located in the lower cavity. The lower spring is sleeved outside the lower ejector pin, and the two ends of the lower spring elastically contact with the bottom wall of the lower cavity and the head of the lower ejector pin respectively. The head of the upper ejector pin and the head of the lower ejector pin contact with each other and are located in the floating space. Multiple balls are respectively arranged in one-to-one correspondence with multiple floating slides. The head of the upper ejector pin and the head of the lower ejector pin are both provided with an arcuate annular groove. The arcuate annular groove of the upper ejector pin and the arcuate annular groove of the lower ejector pin are surrounded to form an annular groove. One side of the ball extends into the floating groove and can move along the floating groove, and the other side of the ball extends into the annular groove. A non-cylinder is provided at the tail of the tap, and the tail of the tap is inserted into multiple spacers and multiple O-rings. After the non-cylinder passes through the non-circular hole, it contacts with the shaft end of the lower ejector pin, and a movable gap is provided between the inner wall of the non-circular hole and the outer wall of the non-cylinder.

[0010] Furthermore, a radial swing gap is provided between the inner wall of the spacer and the outer wall of the tap.

[0011] Furthermore, the upper end surface of the non-cylindrical body is provided with a spherical surface, and the shaft end of the lower ejector pin is concavely provided with an arc groove, and the spherical surface and the arc groove are concavely matched.

[0012] Furthermore, a middle sliding sleeve of the tapping chuck body is provided with a pre-adjusted pressure display ring, which is arranged corresponding to the floating space. A groove is recessed on the inner wall of the pre-adjusted pressure display ring, and one side of the ball extends into the groove through the floating groove.

[0013] Furthermore, a pressure scale is provided in the middle of the tapping chuck body, and the preset pressure display ring is used to indicate the scale value on the pressure scale.

[0014] Furthermore, the tapping chuck body is provided with a riveted flange, which is located at the edge of the hole opening of the embedding hole, and the riveted flange is used to limit the spacer sleeve and the O-ring in the embedding hole.

[0015] Furthermore, a mounting groove is recessed on an outer side wall of one end of the tapping chuck body away from the tap.

[0016] Furthermore, the upper ejector pin and the lower ejector pin are of an integrated structure.

[0017] The beneficial effects of the utility model are as follows: the tap of the utility model can make adaptive radial swing and axial sliding during tapping to ensure that the tapping can be completed smoothly, the tapping quality is good, the tap is not easily damaged, and the tapping rotation speed can be increased, thereby improving the tapping efficiency. The pre-tightening pressure of the tap is adjustable to meet different tapping requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a cross-sectional view of the utility model.

[0019] Figure 2 It is a three-dimensional structural schematic diagram of the utility model.

[0020] Figure 3 It is a schematic diagram of the three-dimensional structure of the tapping chuck body of the utility model.

[0021] Description of reference numerals:

[0022] 1. Tapping chuck body; 2. Tap; 3. Upper ejector pin; 4. Upper spring; 5. Lower ejector pin; 6. Lower spring; 7. Hollow sleeve; 8. Preload screw; 9. Ball; 10. Spacer; 11. O-ring; 12. Mounting hole; 13. Non-circular hole; 14. Lower sliding hole; 15. Lower cavity; 16. Floating space; 17. Upper cavity; 18. Upper sliding hole; 19. Floating slide; 20. Annular groove; 21. Non-cylindrical; 23. Spherical surface; 24. Pre-adjusted pressure display ring; 25. Slot; 26. Riveted flange; 27. Mounting groove; 28. Pressure scale; 29. ​​Threaded hole. DETAILED DESCRIPTION

[0023] In order to facilitate the understanding of those skilled in the art, the present invention is further described below in conjunction with embodiments and drawings. The contents mentioned in the implementation modes are not intended to limit the present invention.

[0024] like Figures 1 to 3As shown, the utility model provides an adjustable adaptive tapping chuck, which includes a tapping chuck body 1, a tap 2, an upper ejector pin 3, an upper spring 4, a lower ejector pin 5, a lower spring 6, a hollow sleeve 7, a preload screw 8, a plurality of balls 9, a plurality of spacers 10 and a plurality of O-rings 11. The tapping chuck body 1 is axially connected with an embedding hole 12, a non-circular hole 13, a lower sliding hole 14, a lower cavity 15, a floating space 16, an upper cavity 17, an upper sliding hole 18 and a threaded hole 29. The tapping chuck body 1 is radially connected with a floating space 16, an upper cavity 17, an upper sliding hole 18 and a threaded hole 29. The plurality of floating slide grooves 19 connected to the dynamic space 16 are distributed in a ring array, and the floating slide grooves 19 extend along the axial direction of the tapping chuck body 1. A plurality of spacers 10 and a plurality of O-rings 11 are embedded in the embedding hole 12 at intervals. The hollow sleeve 7 is slidably arranged in the upper sliding hole 18. The pre-tightening screw 8 is threadedly connected with the threaded hole 29. The inner end of the pre-tightening screw 8 abuts against the upper end of the hollow sleeve 7. The shaft of the upper ejector 3 is slidably inserted into the inner hole of the hollow sleeve 7. The upper spring 4 is sleeved outside the upper ejector 3 and is located in the upper cavity 17. The two ends of the upper spring 4 are elastically in conflict with the lower end of the hollow sleeve 7 and the head of the upper ejector 3 respectively. The shaft of the lower ejector 5 is slidably inserted into the lower sliding hole 14 and is located in the lower cavity 15. The lower spring 6 is sleeved outside the lower ejector 5. The two ends of the lower spring 6 are elastically in conflict with the bottom wall of the lower cavity 15 and the head of the lower ejector 5 respectively. The head of the upper ejector 3 and the head of the lower ejector 5 are in conflict with each other and are located in the floating space 16. The multiple balls 9 are respectively arranged in a one-to-one correspondence with the multiple floating slide grooves 19. The heads of the upper ejector 3 and the lower ejector 5 are both arranged There is an arcuate annular groove, the arcuate annular groove of the upper ejector 3 and the arcuate annular groove of the lower ejector 5 are surrounded by an annular groove 20, one side of the ball 9 extends into the floating groove 19 and can move along the floating groove 19, the other side of the ball 9 extends into the annular groove 20, the tail of the tap 2 is provided with a non-cylinder 21, the tail of the tap 2 is inserted into multiple spacers 10 and multiple O-rings 11, the non-cylinder 21 penetrates the non-circular hole 13 and then contacts the shaft end of the lower ejector 5, and a movable gap is provided between the inner wall of the non-circular hole 13 and the outer wall of the non-cylinder 21.

[0025] During assembly, the lower spring 6, the lower ejector pin 5, the ball 9, the upper ejector pin 3, the upper spring 4, the hollow sleeve 7, the pre-tightening screw 8 and the tap 2 are sequentially installed on the tapping chuck body 1. When the tap 2 is assembled, the tap 2 will squeeze the O-ring 11, causing the O-ring 11 to elastically deform and elastically clamp the tap 2, so that the tap 2 is not easy to fall off. The non-cylinder 21 of the tap 2 slides through the non-circular hole 13. While ensuring that the tap 2 and the tapping chuck body 1 can rotate synchronously, the tap 2 can slide along the axial direction of the tapping chuck body 1. By screwing the pre-tightening screw 8 so that the pre-tightening screw 8 can reciprocate in the threaded hole 29, the reciprocating pre-tightening screw 8 can adjust the pre-tightening pressure of the upper spring 4 and the lower spring 6 via the hollow sleeve 7, the upper ejector pin 3 and the lower ejector pin 5, thereby making the pre-tightening pressure adjustable. In actual application, the utility model is installed on a CNC machine tool. When the CNC machine tool starts the tapping operation, the tap 2 enters the threaded bottom hole of the workpiece to tap. Since the upper spring 4, the lower spring 6, and the O-ring 11 can undergo elastic deformation and there is a movable gap between the inner wall of the non-circular hole 13 and the outer wall of the non-cylinder 21, the tap 2 can make adaptive radial swing and axial sliding during the tapping process to ensure that the tapping can be completed smoothly, the tapping quality is good, the tap 2 is not easily damaged, and the tapping speed can be increased. When the tap 2 slides axially, the lower spring 6 and the upper spring 4 will be squeezed, and the lower ejector pin 5, the ball 9, and the upper ejector pin 3 will move upward along the axial direction of the tapping chuck body 1.

[0026] The tap 2 of the utility model can make adaptive radial swing and axial sliding during tapping to ensure that the tapping can be completed smoothly with good tapping quality. The tap 2 is not easily damaged and the tapping rotation speed can be increased, thereby improving the tapping efficiency. The pre-tightening pressure of the tap 2 is adjustable to meet different tapping requirements.

[0027] In this embodiment, there is a radial swing gap between the inner wall of the spacer 10 and the outer wall of the tap 2. This structural design ensures that the tap 2 can make adaptive radial swings.

[0028] In this embodiment, the upper end surface of the non-cylindrical 21 is provided with a spherical surface 23, and the shaft end of the lower ejector pin 5 is provided with an arc groove, and the spherical surface 23 is concavely matched with the arc groove. This structural design ensures that the tap 2 can make adaptive radial swings and is conducive to the stable contact between the end surface of the non-cylindrical 21 and the shaft end of the lower ejector pin 5.

[0029] In this embodiment, the middle sliding sleeve of the tapping chuck body 1 is provided with a pre-adjusting pressure display ring 24, which is arranged corresponding to the floating space 16, and the inner wall of the pre-adjusting pressure display ring 24 is concavely provided with a card slot 25, and one side of the ball 9 extends into the card slot 25 through the floating slide 19. A pressure scale 28 is arranged in the middle of the tapping chuck body 1, and the pre-adjusting pressure display ring 24 is used to indicate the scale value on the pressure scale 28. When the pre-tightening screw 8 adjusts the pre-tightening pressure of the upper spring 4 and the lower spring 6, the ball 9 will drive the pre-adjusting pressure display ring 24 to move synchronously. After the adjustment is completed, the scale value of the pressure scale 28 indicated by the pre-adjusting pressure display ring 24 is the pre-tightening pressure at this time, which is conducive to the operator to accurately adjust the pre-tightening pressure.

[0030] In this embodiment, the tapping chuck body 1 is provided with a riveted flange 26, which is located at the edge of the hole opening of the embedding hole 12, and is used to limit the spacer 10 and the O-ring 11 in the embedding hole 12. After multiple spacers 10 and multiple O-rings 11 are embedded in the embedding hole 12 at intervals, the riveted flange 26 is riveted toward the embedding hole 12 to form a shape, so that the riveted flange 26 is bent and the spacer 10 and the O-ring 11 are limited in the embedding hole 12, so that the spacer 10 and the O-ring 11 will not fall out of the embedding hole 12.

[0031] In this embodiment, a mounting groove 27 is concavely formed on the outer side wall of the end of the tapping chuck body 1 away from the tap 2. The arrangement of the mounting groove 27 facilitates the assembly and use of the utility model with a numerically controlled machine tool.

[0032] In another embodiment, the upper ejector pin 3 and the lower ejector pin 5 are integrally constructed.

[0033] All technical features in this embodiment can be freely combined according to actual needs.

[0034] The above embodiments are preferred implementation schemes of the present invention. In addition, the present invention can also be implemented in other ways. Any obvious replacement without departing from the concept of the present technical solution is within the protection scope of the present invention.

Claims

1. An adjustable self-adaptive tapping chuck, characterized in that: The invention comprises a tapping chuck body (1), a tap (2), an upper ejector pin (3), an upper spring (4), a lower ejector pin (5), a lower spring (6), a hollow sleeve (7), a pre-tightening screw (8), a plurality of ball bearings (9), a plurality of spacer sleeves (10) and a plurality of O-rings (11); the tapping chuck body (1) is provided with an embedding hole (12), a non-circular hole (13), a lower sliding hole (14), a lower cavity (15), a floating space (16), an upper cavity (17), an upper sliding hole (18) and a threaded hole (29) in the axial direction; the tapping chuck body (1) is provided with a plurality of radial holes in communication with the floating space (16) A floating slide groove (19) extends along the axial direction of the tapping chuck body (1), a plurality of spacer sleeves (10) and a plurality of O-rings (11) are embedded in the embedding hole (12) at intervals, a hollow sleeve (7) is slidably arranged in the upper slide hole (18), a pre-tightening screw (8) is threadedly connected with the threaded hole (29), the inner end of the pre-tightening screw (8) abuts against the upper end of the hollow sleeve (7), the shaft of the upper ejector pin (3) is slidably inserted into the inner hole of the hollow sleeve (7), an upper spring (4) is sleeved outside the upper ejector pin (3) and is located in the upper cavity (17), and the two ends of the upper spring (4) are respectively connected to the hollow sleeve (7) The lower end of the upper ejector (3) elastically contacts with the head of the upper ejector pin (3), the shaft of the lower ejector pin (5) is slidably inserted into the lower sliding hole (14) and is located in the lower cavity (15), the lower spring (6) is sleeved outside the lower ejector pin (5), the two ends of the lower spring (6) are respectively elastically contacted with the bottom wall of the lower cavity (15) and the head of the lower ejector pin (5), the head of the upper ejector pin (3) and the head of the lower ejector pin (5) are contacted with each other and are located in the floating space (16), a plurality of balls (9) are respectively arranged in one-to-one correspondence with a plurality of floating grooves (19), the head of the upper ejector pin (3) and the head of the lower ejector pin (5) are both provided with arcuate annular grooves, and the upper ejector pin (3) and the lower ejector pin (5) are respectively arranged in one-to-one correspondence with each other. The arcuate annular groove of the tap (3) and the arcuate annular groove of the lower ejector (5) are arranged to form an annular groove (20), one side of the ball (9) extends into the floating groove (19) and can move along the floating groove (19), and the other side of the ball (9) extends into the annular groove (20), the tail of the tap (2) is provided with a non-cylinder (21), the tail of the tap (2) is inserted into a plurality of spacers (10) and a plurality of O-rings (11), the non-cylinder (21) penetrates the non-circular hole (13) and then contacts the shaft end of the lower ejector (5), and a movable gap is arranged between the inner wall of the non-circular hole (13) and the outer wall of the non-cylinder (21).

2. An adjustable self-adaptive tapping chuck according to claim 1, characterized in that: A radial swing gap is formed between the inner wall of the spacer (10) and the outer wall of the tap (2).

3. The adjustable self-adaptive tapping chuck according to claim 1, characterized in that: The upper end surface of the non-cylindrical part (21) is provided with a spherical surface (23), and the shaft end of the lower ejector pin (5) is concavely provided with an arc groove, and the spherical surface (23) and the arc groove are concave-convexly matched.

4. The adjustable self-adaptive tapping chuck according to claim 1, characterized in that: A pre-adjusted pressure display ring (24) is provided on the middle sliding sleeve of the tapping chuck body (1). The pre-adjusted pressure display ring (24) is arranged corresponding to the floating space (16). A clamping groove (25) is recessed on the inner wall of the pre-adjusted pressure display ring (24). One side of the ball (9) extends into the clamping groove (25) via the floating slide groove (19).

5. The adjustable self-adaptive tapping chuck according to claim 4, characterized in that: A pressure scale (28) is arranged in the middle of the tapping chuck body (1), and the preset pressure display ring (24) is used to indicate the scale value on the pressure scale (28).

6. The adjustable self-adaptive tapping chuck according to claim 1, characterized in that: The tapping chuck body (1) is provided with a riveted flange (26), which is located at the edge of the hole opening of the embedding hole (12). The riveted flange (26) is used to limit the spacer (10) and the O-ring (11) in the embedding hole (12).

7. The adjustable self-adaptive tapping chuck according to claim 1, characterized in that: A mounting groove (27) is recessed on the outer wall of one end of the tapping chuck body (1) away from the tap (2).

8. The adjustable self-adaptive tapping chuck according to claim 1, characterized in that: The upper ejector pin (3) and the lower ejector pin (5) are of an integrated structure.

Images