A fine-tuning clamping mechanism for micro-drilling machining

Abstract

The present application discloses a fine-tuning clamping mechanism for micro-drilling processing, including a mounting base. A bar stock placement mechanism, a bar stock limiting mechanism, and a needle head alignment mechanism are provided on the mounting base. The bar stock placement mechanism is used to place the bar stock to be processed. The bar stock limiting mechanism is used to limit the bar stock to be processed on the bar stock placement mechanism. The needle head alignment mechanism is used to correct the concentricity between the drill needle and the bar stock. The needle head alignment mechanism includes a needle head alignment rod, an alignment pushing mechanism, and an alignment adjusting mechanism. The needle head alignment rod is respectively connected to the alignment pushing mechanism and the alignment adjusting mechanism. The alignment pushing mechanism is used to drive the needle head alignment rod to abut against the drill needle. The alignment adjusting mechanism is used to adjust the abutting position and force between the needle head alignment rod and the drill needle. Through the needle head alignment rod and the alignment adjusting mechanism, the present application can always ensure the concentricity between the bar stock and the drill needle during micro-drilling processing, and improve the yield rate.

Description

Technical Field

[0001] The present application belongs to the field of micro-drilling processing equipment, and more specifically, relates to a micro-adjustable clamping mechanism for micro-drilling processing. Background Art

[0002] Drills with a diameter less than 3.175mm are usually called micro drills, or micro drills for short. Micro drills are mainly composed of a bar at the bottom and a drill needle at the top. The micro drill process needs to go through multiple stations, and the bar needs to be clamped and fixed at each station to facilitate grinding of the bar. In order to ensure the processing accuracy of the micro drill, higher requirements are placed on the clamping mechanism. It is necessary to ensure the stability of the bar on the clamping mechanism at all times, and also to ensure the concentricity of the bar and the drill needle.

[0003] During the processing of the micro-drilling process, the clamping mechanism on the existing equipment is connected to the bar material by a limited fixed connection, which can only fix the workpiece and cannot always ensure the concentricity and stability of the micro-drilling process. When eccentricity occurs during the micro-drilling process, there is no way to make corresponding adjustments, resulting in a high defective rate of processing. Summary of the invention

[0004] In order to solve the problems existing in the above-mentioned prior art, the present application provides a fine-adjustable clamping mechanism for micro-drilling processing, including a mounting base, on which a rod placement mechanism, a rod limiting mechanism and a needle straightening mechanism are provided, the rod placement mechanism is used to place the rod to be processed, the rod limiting mechanism is used to limit the rod to be processed on the rod placement mechanism, and the needle straightening mechanism is used to correct the concentricity of the drill needle and the rod; the needle straightening mechanism includes a needle straightening rod, a straightening pushing mechanism and a straightening adjusting mechanism, the needle straightening rod is respectively connected to the straightening pushing mechanism and the straightening adjusting mechanism, the straightening pushing mechanism is used to drive the needle straightening rod to abut against the drill needle, and the straightening adjusting mechanism is used to adjust the abutment position and strength of the needle straightening rod and the drill needle.

[0005] As a further improvement of the present application, the straightening push mechanism includes a straightening fixed block, a straightening push block and a straightening rod mounting block, the straightening fixed block is connected to the mounting base, the middle part of the straightening push block is hinged to the straightening fixed block, the needle straightening rod is connected to the straightening rod mounting block, the straightening rod mounting block is connected to one end of the straightening push block, and the other end of the straightening push block is a free end, and the free end is used for external thrust to push the straightening push block to swing.

[0006] As a further improvement of the present application, the straightening and adjusting mechanism includes an elevation adjusting block. The straightening rod mounting block is provided with a first through hole and a second through hole. The first through hole communicates with the second through hole, and the first through hole and the second through hole are vertically distributed. The elevation adjusting block is inserted into the first through hole, and the elevation adjusting block is rotatably and limit-connected to the straightening rod mounting block; a third through hole is provided in the elevation adjusting block. The needle straightening rod sequentially passes through the second through hole and the third through hole, and the needle straightening rod is limit-connected to the elevation adjusting block. The inner diameter of the second through hole is larger than the outer diameter of the needle straightening rod.

[0007] As a further improvement of the present application, a reset mechanism is provided on the straightening and fixing block. One end of the reset mechanism is connected to the straightening and fixing block, and the other end of the reset mechanism is connected to one end of the straightening and pushing block close to the straightening rod mounting block. The reset mechanism is used to drive the needle straightening rod to separate from the drill bit.

[0008] As a further improvement of the present application, the bar limiting mechanism includes a guide wheel mechanism, a pressure wheel mechanism and a bar straightening mechanism. The guide wheel mechanism is connected to the mounting base, and the guide wheel mechanism can drive the bar to rotate on the bar placement mechanism; the guide wheel mechanism includes a driving motor and a guide wheel. The driving motor is connected to the mounting base, and the guide wheel is connected to the output end of the driving motor.

[0009] As a further improvement of the present application, the pressure wheel mechanism includes a driving cylinder, a linkage mechanism and a pressure wheel. The driving cylinder is connected to the mounting base, the linkage mechanism is connected to the output end of the driving cylinder, the pressure wheel is rotatably and limit-connected to the linkage mechanism, and the linkage mechanism can drive the pressure wheel to move.

[0010] As a further improvement of the present application, the linkage mechanism includes a connecting rod and a swing rod. One end of the connecting rod is connected to the driving cylinder, and the other end is connected to the swing rod. The middle of the swing rod is hinged to the mounting base, and the pressure wheel is rotatably and limit-connected to the end of the swing rod away from the connecting rod.

[0011] As a further improvement of the present application, the bar straightening mechanism includes a base and a straightening and adjusting block. The base is connected to the mounting base, the straightening and adjusting block is connected to the base, and wear-resistant blocks are provided on the straightening and adjusting block.

[0012] As a further improvement of the present application, the bar placement mechanism includes a top material cylinder and a top pin. The top material cylinder is connected to the mounting base, and the top pin is connected to the output end of the top material cylinder.

[0013] As a further improvement of the present application, a sensor is provided at a corresponding position on the mounting base and the ejector pin, and the sensor is used to detect whether the bar stock on the ejector pin is in place.

[0014] Compared with the prior art, the beneficial effects of the present application are as follows:

[0015] The present application is provided with a bar stock limiting mechanism, which can limit the bar stock on the bar stock placement mechanism to ensure the stability of bar stock installation.

[0016] By providing a straightening and pushing mechanism and a needle straightening rod, the concentricity of the bar stock and the drill needle during micro-drilling can be ensured, and the yield rate of processing can be improved; specifically, during operation, the straightening and pushing mechanism pushes the needle straightening rod against the drill needle, thereby preventing the drill needle from bending sideways, enabling the outer circumferential side wall of the drill needle to be ground evenly, and ensuring the concentricity of the bar stock and the drill needle.

[0017] When eccentricity occurs during the micro-drilling process, it can be corrected in a timely manner to ensure the yield rate of processing; specifically, by operating the straightening adjustment mechanism to adjust the installation position of the needle straightening rod, the contact position and force between the needle straightening rod and the drill needle can be adjusted, thereby ensuring the concentricity of the bar stock and the drill needle. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the solutions in the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0019] Figure 1 is a schematic diagram of the overall structure of an embodiment of the present application;

[0020] Figure 2 is a schematic diagram of the working state structure of an embodiment of the present application;

[0021] Figure 3 is a schematic diagram of the structure of the needle straightening mechanism in an embodiment of the present application;

[0022] Figure 4 is a schematic diagram of the exploded structure of the straightening adjustment mechanism in an embodiment of the present application;

[0023] Figure 5 is a schematic diagram of the exploded structure of the bar stock straightening mechanism in an embodiment of the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which this application belongs; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "comprising" and "having" and any variations thereof in the specification and claims of this application and the above drawings are intended to cover non-exclusive inclusion. The terms "first", "second", etc. in the specification and claims of this application or the above drawings are used to distinguish different objects and not to describe a specific order.

[0025] Reference to "embodiment" herein means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of this application. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0026] To enable those skilled in the technical field to better understand the solution of this application, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the drawings.

[0027] As Figures 1-5 shown, a fine-tuning clamping mechanism for micro-drill machining is used to be installed on a precision grinder for grinding micro-drills. The micro-drill mainly consists of a rod at the bottom and a drill bit at the upper part. The precision grinder is provided with a machine table and a controller. A manipulator and a grinding mechanism are installed on the machine table. The controller can control the manipulator to load and unload the fine-tuning clamping mechanism for micro-drill machining, and can control the grinding mechanism to move to the corresponding position of the fine-tuning clamping mechanism for micro-drill machining to grind the rod.

[0028] The fine-tuning clamping mechanism for micro-drill machining includes a mounting base 1. A rod placement mechanism 2, a rod limiting mechanism, and a needle centering mechanism 3 are arranged on the mounting base 1 and are respectively connected to the controller. The rod placement mechanism 2 is used to place the rod to be processed, support the rod during processing, and also used to eject the rod from the fine-tuning clamping mechanism for micro-drill machining; the rod limiting mechanism is used to limit the rod to be processed on the rod placement mechanism 2 to prevent the rod from shifting during processing and improve the processing accuracy; the needle centering mechanism 3 is used to correct the concentricity between the drill bit and the rod, and can support the drill bit during the precision grinder processing to prevent the drill bit from bending sideways and improve the concentricity between the drill bit and the rod.

[0029] When the fine-tuning clamping mechanism for micro-drill machining is loading materials, the manipulator grabs and places the bar stock to be machined onto the bar stock placement mechanism 2, and the controller controls the bar stock limiting mechanism to work, limiting and fixing the bar stock to be machined on the bar stock placement mechanism 2. During machining, the needle alignment mechanism 3 starts to work. The needle alignment mechanism 3 presses against the drill bit, and the grinding mechanism of the precision grinder grinds the drill bit. By pressing against the drill bit with the needle alignment mechanism 3, it can ensure that the drill bit will not bend sideways during the grinding process, thus ensuring the concentricity between the drill bit and the bar stock.

[0030] The needle alignment mechanism 3 includes an alignment fixing block 31, an alignment pushing block 32, an alignment rod mounting block 33, and a needle alignment rod 34. The alignment fixing block 31 is connected to the mounting base 1. The middle of the alignment pushing block 32 is hinged to the alignment fixing block 31, and the alignment pushing block 32 can swing around the hinge point. The needle alignment rod 34 is connected to the alignment rod mounting block 33, and the alignment rod mounting block 33 is connected to one end of the alignment pushing block 32. The other end of the alignment pushing block 32 is a free end 321, and the free end 321 is used to externally connect a thrust to push the alignment pushing block 32 to swing, thereby driving the needle alignment rod 34 to abut against the drill bit.

[0031] In this embodiment, the externally connected thrust of the free end 321 is a push rod 4. The push rod 4 is connected to the grinding mechanism of the precision grinder, and the grinding mechanism can drive the push rod 4 to move. During operation, the grinding mechanism moves closer to the bar stock, thereby driving the push rod 4 to move, so that the push rod 4 abuts against the free end 321 of the alignment pushing block 32, thereby pushing the alignment pushing block 32 to swing. The alignment pushing block 32 pushes the alignment rod mounting block 33 and the needle alignment rod 34 to move. When the grinding mechanism stops moving, the push rod 4 can push the needle alignment rod 34 to abut against the drill bit. There is a push rod fixing block 41 on the grinding mechanism of the precision grinder. A micrometer 42 is installed on the push rod fixing block 41. The push rod 4 is fixedly connected to the screw of the micrometer 42. By rotating the micrometer 42, the extended length of the push rod 4 can be adjusted. By adjusting the extended length of the push rod 4, the movement stroke of the needle alignment rod 34 can be adjusted, and the abutting force of the needle alignment rod 34 against the drill bit can be changed to ensure the concentricity between the drill bit and the bar stock during machining. The micrometer 42 can be a screw micrometer without a frame in the prior art. There are scales on the scale body, and the adjustment accuracy can reach 0.01 mm.

[0032] The straightening fixed block 31 is provided with a reset mechanism, which is used to drive the straightening push block 32 to reset and move, thereby driving the needle straightening rod 34 to separate from the drill needle, which is convenient for cutting. Specifically, the reset mechanism includes a reset spring 35, one end of the reset spring 35 is fixedly connected to the straightening fixed block 31, and the other end is fixedly connected to one end of the straightening push block 32 close to the straightening rod mounting block 33. During operation, when the grinding mechanism of the fine grinder drives the push rod 4 to abut against the straightening push block 32 and push the straightening push block 32 to swing, the thrust of the push rod 4 is greater than the elastic force of the reset spring 35, so the straightening push block 32 will stretch the reset spring 35, causing the reset spring 35 to undergo elastic deformation. After the processing is completed, the grinding mechanism of the fine grinder is reset, driving the push rod 4 to move and separate it from the straightening push block 32. At this time, under the action of the elastic force of the reset spring 35, the straightening push block 32 is pulled to reset and swing, thereby driving the needle straightening rod 34 to reset and move, so that it is separated from the drill needle, which is convenient for the manipulator to grab and cut the material.

[0033] The straightening rod mounting block 33 is provided with a straightening adjustment mechanism, which is used to adjust the installation position of the needle straightening rod 34, thereby adjusting the abutment position and strength between the needle straightening rod 34 and the drill needle.

[0034] Specifically, a long slot 331 is provided on the straightening rod mounting block 33, and a first limiting screw 332 is provided on the long slot 331. The first limiting screw 332 is connected to the straightening push block 32, and the straightening rod mounting block 33 and the straightening push block 32 are limited and fixed by tightening the first limiting screw 332; an adjusting screw 333 is provided on one side of the straightening rod mounting block 33, and the adjusting screw 333 is adjustable and threadedly connected to the straightening rod mounting block 33, and the end face of the adjusting screw 333 abuts against the straightening push block 32 When it is necessary to adjust the installation position of the straightening rod mounting block 33, the user can loosen the first limit screw 332 and then rotate the adjusting screw 333 to make the first limit screw 332 slide on the elongated slot 331, thereby changing the installation position of the straightening rod mounting block 33 on the straightening push block 32. After reaching the appropriate position, the first limit screw 332 can be tightened again. The installation position of the straightening rod mounting block 33 is changed, and the contact position between the needle straightening rod 34 and the drill needle is also changed.

[0035] The upright rod mounting block 33 is provided with a first through hole 334 and a second through hole 335. The first through hole 334 communicates with the second through hole 335, and the first through hole 334 and the second through hole 335 are vertically distributed. An elevation adjustment block 36 is arranged in the first through hole 334. The elevation adjustment block 36 is in clearance fit with the first through hole 334. The upright rod mounting block 33 is provided with a second limit screw 336. The end face of the second limit screw 336 abuts against the side wall of the elevation adjustment block 36, so that the elevation adjustment block 36 is limited and fixed to the upright rod mounting block 33. A third through hole 361 is arranged in the elevation adjustment block 36. The needle upright rod 34 sequentially passes through the second through hole 335 and the third through hole 361. The needle upright rod 34 is in clearance fit with the third through hole 361. The elevation adjustment block 36 is provided with a third limit screw 362. The end face of the third limit screw 362 abuts against the needle upright rod 34, so that the needle upright rod 34 is limited and connected and fixed to the elevation adjustment block 36. The inner diameter of the second through hole 335 is larger than the outer diameter of the needle upright rod 34, so that the needle upright rod 34 can swing up and down in the second through hole 335. When adjustment is needed, the user can loosen the second limit screw 336, and the elevation adjustment block 36 can rotate in the first through hole 334, thereby driving the needle upright rod 34 to swing up and down in the second through hole 335, so as to adjust the installation angle of the needle upright rod 34, and further change the abutting position between the needle upright rod 34 and the drill bit; loosen the third limit screw 362, and the needle upright rod 34 can slide in the second through hole 335, so as to adjust the length of the needle upright rod 34 extending out of the upright rod mounting block 33, and further change the abutting force of the needle upright rod 34 on the drill bit. In order to facilitate the adjustment of the needle upright rod 34, a handle 37 is arranged at one end of the needle upright rod 34 far away from the drill bit. The handle 37 is fixedly connected to the needle upright rod 34, which is convenient for the user to manually adjust.

[0036] The bar stock placement mechanism 2 includes a blanking cylinder 21 and a ejector pin 22. The blanking cylinder 21 is fixedly connected to the mounting base 1 through a blanking fixed seat 23. The blanking cylinder 21 is connected to the controller. The ejector pin 22 is connected to the output end of the blanking cylinder 21. An inductor 24 is arranged at the corresponding position of the mounting base 1 and the ejector pin 22. The inductor 24 is connected to the controller and is used to detect whether the bar stock on the ejector pin 22 is in place. When loading the micro-drill processing fine-tuning clamping mechanism, the controller controls the blanking cylinder 21 to work, pushing the ejector pin 22 to rise. The manipulator of the precision grinder places the bar stock on the ejector pin 22, and the ejector pin 22 can support the bottom end of the bar stock; control the blanking cylinder 21 to reset, driving the ejector pin 22 and the bar stock to descend to the processing position. When the inductor 24 detects that the bar stock on the ejector pin 22 is in place, a feedback signal is sent to the controller, and the controller then controls the bar stock limiting mechanism to work to limit the bar stock on the ejector pin 22. After processing is completed, the controller controls the blanking cylinder 21 to work, pushing the ejector pin 22 to rise, and the ejector pin 22 jacks up the bar stock, which is convenient for the manipulator to grab the processed bar stock.

[0037] The bar limiting mechanism includes a guide wheel mechanism 5, a pressure wheel mechanism 6, and a bar straightening mechanism 7. During processing, the side wall of the bar is in contact with the guide wheel mechanism 5, the pressure wheel mechanism 6, and the bar straightening mechanism 7 respectively, so that the bar is vertically limited and fixed on the center drill 22. The guide wheel mechanism 5 is connected to the controller and can drive the bar to rotate in place on the center drill 22, ensuring that the circumferential side wall of the drill bit can be ground evenly and improving the concentricity between the bar and the drill bit. The pressure wheel mechanism 6 is connected to the controller. After the feeding is completed, the controller controls the pressure wheel mechanism 6 to contact the bar, thereby limiting the bar on the center drill 22. The bar straightening mechanism 7 is fixedly connected to the mounting base 1 and is used to support the side wall of the bar. On the one hand, it facilitates the manipulator to vertically place the bar on the center drill 22. On the other hand, it can also limit and fix the bar during processing, ensuring that the bar does not shift on the center drill 22 and improving the processing accuracy.

[0038] The guide wheel mechanism 5 includes a driving motor 51 and a guide wheel 52. The driving motor 51 is connected to the controller. The driving motor 51 is fixedly installed on the mounting base 1. The output end of the driving motor 51 is fixedly connected to the guide wheel 52 through a transmission shaft. During operation, the outer side wall of the guide wheel 52 is in contact with the side wall of the bar. The controller controls the driving motor 51 to work. The driving motor 51 drives the guide wheel 52 to rotate, and the guide wheel 52 drives the bar to rotate in place. The guide wheel 52 can not only limit the bar but also drive the bar to rotate, ensuring that the circumferential side of the drill bit can be ground evenly.

[0039] The pressure wheel mechanism 6 is installed on one side of the guide wheel mechanism 5. The pressure wheel mechanism 6 includes a driving cylinder 61, a linkage mechanism, and a pressure wheel 62. The driving cylinder 61 is fixedly connected to the mounting base 1 through a cylinder fixing seat 63. The driving cylinder 61 is connected to the controller. The linkage mechanism is connected to the output end of the driving cylinder 61. The pressure wheel 62 is connected to the side of the linkage mechanism away from the driving cylinder 61 in a limited way, and the pressure wheel 62 can rotate in place on the linkage mechanism. The linkage mechanism can drive the pressure wheel 62 to move, so as to drive the pressure wheel 62 to contact the bar on the center drill 22. When loading the bar for the fine-adjustable clamping mechanism for micro-drill processing, the manipulator places the bar on the center drill 22. The controller controls the driving cylinder 61 to work. The driving cylinder 61 drives the linkage mechanism to move. The linkage mechanism drives the pressure wheel 62 to move towards the direction close to the guide wheel 52 until the pressure wheel 62 contacts the bar on the center drill 22. During processing, the driving motor 51 works to drive the guide wheel 52 to rotate. The guide wheel 52 drives the bar to rotate in place on the center drill 22. The bar drives the pressure wheel 62 to rotate in place on the linkage mechanism. The rotation processing of the bar can ensure that the outer wall circumference of the drill bit is polished evenly and improve the concentricity between the bar and the drill bit. After processing is completed, the controller controls the driving cylinder 61 to work. The driving cylinder 61 drives the linkage mechanism to move. The linkage mechanism drives the pressure wheel 62 to move away from the guide wheel 52 until the pressure wheel 62 separates from the bar on the center drill 22, facilitating the manipulator to unload the material.

[0040] In this embodiment, the linkage mechanism includes a connecting rod 64 and a swing rod 65. One end of the connecting rod 64 is fixedly connected to the output end of the driving cylinder 61, and the other end is fixedly connected to the swing rod 65. The middle of the swing rod 65 is hinged to the mounting base 1, and the swing rod 65 can swing around the hinge point. The pressing wheel 62 is installed at the end of the swing rod 65 away from the connecting rod 64, and the pressing wheel 62 can rotate in place on the swing rod 65. During specific operation, the driving cylinder 61 drives the connecting rod 64 to move, and the connecting rod 64 pulls or pushes the swing rod 65 to move. The swing rod 65 swings around the hinge point, thereby driving the pressing wheel 62 to move in a direction away from or closer to the guide wheel 52. In other embodiments, the linkage mechanism can also be other structures, as long as it can ensure that the driving force of the driving cylinder 61 is transmitted to the pressing wheel 62 and the pressing wheel 62 can rotate.

[0041] The bar stock straightening mechanism 7 is installed on one side of the guide wheel mechanism 5. The bar stock straightening mechanism 7 includes a base 71 and a straightening adjustment block 72. The base 71 is fixedly installed on the mounting base 1 by screws. The straightening adjustment block 72 is adjustably and limit-connected to the base 71. A first wear-resistant block 73 is provided at one end of the straightening adjustment block 72 close to the thimble 22. The first wear-resistant block 73 is fixedly connected to the straightening adjustment block 72 by screws. During operation, the first wear-resistant block 73 abuts against the bar stock, and the bar stock rotates on the thimble and is in a sliding friction state with the first wear-resistant block 73. The setting of the first wear-resistant block 73 can prevent wear, improve the stability of micro-drill machining, and ensure the accuracy of micro-drill machining. At the same time, in order to prevent the wear of the needle straightening rod 34 caused by the rotation of the drill bit during operation, a second wear-resistant block 38 is provided at one end of the needle straightening rod 34 close to the drill bit. The second wear-resistant block 38 is fixedly connected to the needle straightening rod 34 by screws. Both the first wear-resistant block 73 and the second wear-resistant block 38 are made of polycrystalline diamond material, have good wear resistance, can extend the service life and improve the stability of machining.

[0042] The upright adjusting block 72 and the base 71 are connected in an adjustable manner to meet the processing requirements of bar materials with different diameters. Specifically, a clamping groove 711 adapted to the outer dimension of the upright adjusting block 72 is provided on the base 71, and the upright adjusting block 72 is limited within the clamping groove 711. An internal threaded hole 712 is provided on the clamping groove 711, and a kidney-shaped hole 721 is provided on the upright adjusting block 72. The kidney-shaped hole 721 and the internal threaded hole 712 are connected by a screw; an adjusting screw 74 is provided at one end of the upright adjusting block 72 away from the first wear-resistant block 73. The adjusting screw 74 is threadedly connected to the upright adjusting block 72 in an adjustable manner. The other end of the adjusting screw 74 is clamped and fixed to the base 71. A spring 75 is sleeved on the adjusting screw 74, and both ends of the spring 75 are connected to the base 71 and the upright adjusting block 72 respectively; the spring 75 is provided to facilitate pushing the upright adjusting block 72 on one hand and to prevent the connection between the upright adjusting block 72 and the base 71 from loosening and improve the structural stability on the other hand. When adjustment is required, loosen the connection screw between the kidney-shaped hole 721 and the internal threaded hole 712, and then rotate the adjusting screw 74. The adjusting screw 74 will push or pull the upright adjusting block 72 to slide within the clamping groove 711. After reaching the appropriate position, tighten the connection screw between the kidney-shaped hole 721 and the internal threaded hole 712, so as to adjust the distance from the first wear-resistant block 73 to the thimble 22 and meet the processing requirements of bar materials with different diameters.

[0043] Working principle:

[0044] When loading the fine-tuning clamping mechanism for micro-drill processing, the controller controls the ejector cylinder 21 to work, pushing the thimble 22 to rise. The manipulator of the precision grinder places the bar material on the thimble 22, and the thimble 22 supports the bottom end of the bar material; control the ejector cylinder 21 to reset, driving the thimble 22 and the bar material to descend to the processing position. When the inductor 24 detects that the bar material on the thimble 22 is in place, it feeds back a signal to the controller, and the controller then controls the guide wheel mechanism 5 to work. At this time, the first wear-resistant block 73 and the guide wheel 52 are respectively in contact with the side wall of the bar material. Then, the controller controls the driving cylinder 61 to work, and the driving cylinder 61 drives the connecting rod 64 to move. The connecting rod 64 pushes the swing rod 65 to swing around the hinge point, thereby driving the pressure wheel 62 to move towards the direction close to the guide wheel 52 until the pressure wheel 62 abuts against the side wall of the bar material to complete the loading; at this time, the bottom end of the bar material is limited by the thimble 22, and the side wall is respectively in limit contact with the first wear-resistant block 73, the guide wheel 52 and the pressure wheel 62.

[0045] During processing, the controller controls the grinding mechanism to move towards the blank, and at the same time controls the driving motor 51 to operate; the grinding mechanism drives the push rod 4 to move, so that the push rod 4 abuts against the free end of the centering push block 32, thereby pushing the centering push block 32 to swing. The centering push block 32 pushes the centering rod mounting block 33 and the needle centering rod 34 to move until the second wear-resistant block 38 on the needle centering rod 34 abuts against the drill bit. The second wear-resistant block 38 can support the drill bit, prevent the drill bit from bending sideways during processing, and improve the concentricity between the drill bit and the blank; the driving motor 51 operates to drive the guide wheel 52 to rotate. The guide wheel 52 drives the blank to rotate in place. At the same time, the pressure wheel 62 rotates with the blank. The rotation processing of the blank can ensure that the circumferential side wall of the drill bit can be ground evenly. During the swinging process of the centering push block 32, the return spring 35 will be stretched, causing the return spring 35 to undergo elastic deformation.

[0046] After processing is completed, the controller controls the grinding mechanism to move away from the blank, and at the same time controls the driving cylinder 61 to operate; the grinding mechanism drives the push rod 4 to separate from the free end of the centering push block 32. At this time, under the action of the elastic force of the return spring 35, the centering push block 32 is pulled back to swing, thereby driving the needle centering rod 34 to move back, so that the second wear-resistant block 38 separates from the drill bit; the driving cylinder 61 drives the connecting rod 64 to move, and the connecting rod 64 pulls the swing rod 65 to swing around the hinge point, thereby driving the pressure wheel 62 to move away from the guide wheel 52 until the pressure wheel 62 separates from the blank; then the controller controls the ejector cylinder 21 to operate, pushing the ejector pin 22 and the processed product to rise, and the manipulator of the precision grinder takes away the processed product from the ejector pin 22.

[0047] Obviously, the embodiments described above are only a part of the embodiments of the present application, rather than all the embodiments. The drawings show the preferred embodiments of the present application, but do not limit the patent scope of the present application. The present application can be implemented in many different forms. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosed content of the present application more thorough and comprehensive. Although the present application has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions described in the foregoing specific embodiments, or perform equivalent replacements on some of the technical features. Any equivalent structure using the specification and drawings of the present application, directly or indirectly applied in other related technical fields, is similarly within the scope of the patent protection of the present application.

Claims

1. A fine-tuning clamping mechanism for micro-drilling processing, characterized in that: It includes an installation base, on which there are a bar stock placement mechanism, a bar stock limiting mechanism, and a needle centering mechanism. The bar stock placement mechanism is used to place the bar stock to be processed. The bar stock limiting mechanism is used to limit the bar stock to be processed on the bar stock placement mechanism. The needle centering mechanism is used to correct the concentricity between the drill needle and the bar stock. The needle centering mechanism includes a needle centering rod, a centering driving mechanism, and a centering adjusting mechanism. The needle centering rod is respectively connected to the centering driving mechanism and the centering adjusting mechanism. The centering driving mechanism is used to drive the needle centering rod to abut against the drill needle. The centering adjusting mechanism is used to adjust the abutting position and force between the needle centering rod and the drill needle. The centering driving mechanism includes a centering fixing block, a centering pushing block, and a centering rod mounting block. The centering fixing block is connected to the installation base. The middle part of the centering pushing block is hinged to the centering fixing block. The needle centering rod is connected to the centering rod mounting block. The centering rod mounting block is connected to one end of the centering pushing block. The other end of the centering pushing block is a free end, and the free end is used to externally connect a thrust to push the centering pushing block to swing. The centering adjusting mechanism includes an elevation angle adjusting block. The centering rod mounting block is provided with a first through hole and a second through hole. The first through hole is communicated with the second through hole, and the first through hole and the second through hole are vertically distributed. The elevation angle adjusting block is inserted into the first through hole, and the elevation angle adjusting block is rotatably and limit-connected to the centering rod mounting block. The elevation angle adjusting block is provided with a third through hole. The needle centering rod sequentially passes through the second through hole and the third through hole, and the needle centering rod is limit-connected to the elevation angle adjusting block. The inner diameter of the second through hole is larger than the outer diameter of the needle centering rod. The centering fixing block is provided with a reset mechanism. One end of the reset mechanism is connected to the centering fixing block, and the other end of the reset mechanism is connected to the end of the centering pushing block close to the centering rod mounting block. The reset mechanism is used to drive the needle centering rod to separate from the drill needle.

2. The fine-tuning clamping mechanism for micro-drilling machining according to claim 1, characterized in that: The bar stock limiting mechanism includes a guide wheel mechanism, a pressing wheel mechanism, and a bar stock centering mechanism. The guide wheel mechanism is connected to the installation base, and the guide wheel mechanism can drive the bar stock to rotate on the bar stock placement mechanism. The guide wheel mechanism includes a driving motor and a guide wheel. The driving motor is connected to the installation base, and the guide wheel is connected to the output end of the driving motor.

3. The fine-adjustable clamping mechanism for micro-drilling machining according to claim 2, wherein: The pressing wheel mechanism includes a driving cylinder, a linkage mechanism, and a pressing wheel. The driving cylinder is connected to the installation base. The linkage mechanism is connected to the output end of the driving cylinder. The pressing wheel is rotatably and limit-connected to the linkage mechanism, and the linkage mechanism can drive the pressing wheel to move.

4. The fine-tuning clamping mechanism for micro-drilling machining according to claim 3, wherein: The linkage mechanism includes a connecting rod and a swing rod. One end of the connecting rod is connected to the driving cylinder, and the other end is connected to the swing rod. The middle part of the swing rod is hinged to the installation base. The pressing wheel is rotatably and limit-connected to the end of the swing rod far from the connecting rod.

5. The fine-tuning clamping mechanism for micro-drill machining according to claim 2, wherein: The bar aligning mechanism includes a base and an alignment adjustment block. The base is connected to the mounting base, the alignment adjustment block is connected to the base, and wear-resistant blocks are provided on the alignment adjustment block.

6. The fine-tuning clamping mechanism for micro-drilling machining according to any one of claims 1 or 3-5, characterized in that: The bar placement mechanism includes a knockout cylinder and a knockout pin. The knockout cylinder is connected to the mounting base, and the knockout pin is connected to the output end of the knockout cylinder.

7. The fine-tuning clamping mechanism for micro-drilling machining according to claim 6, characterized in that: An inductor is provided at a corresponding position of the mounting base with respect to the knockout pin. The inductor is used to detect whether the bar on the knockout pin is in place.

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