Grinding clamp for small-diameter single-blade gun drill

Abstract

The utility model relates to the technical field of clamps, in particular to a small-diameter single-blade gun drill grinding clamp which comprises a servo motor and a bearing seat, a connecting shell is connected between the servo motor and the bearing seat, a main shaft is arranged in the bearing seat, the output end of the servo motor is in butt joint with one end of the main shaft in a matched mode, and the output end of the servo motor is in butt joint with the other end of the main shaft. An ER chuck is arranged in the front end of the main shaft, a nut a is arranged on the outer side of the ER chuck, the nut a and the outer side of the end of the main shaft are in matched screwing connection so that the ER chuck and a positioning sleeve can be locked, the positioning sleeve is arranged in the ER chuck in an inserted mode, the front end of the positioning sleeve protrudes out of the front end of the main shaft, and a fixing sleeve is arranged at the front end of the positioning sleeve. According to the automatic grinding device for the small-diameter single-blade gun drill, the problems that in the automatic grinding process of the small-diameter single-blade gun drill, the grinding repeatability is poor, and the grinding length is limited are effectively solved, and the automatic grinding device for the small-diameter single-blade gun drill has remarkable precision repeatability, economical efficiency and innovativeness.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of clamp, concretely is small diameter single edge gun drill grinding fixture. BACKGROUND

[0002] Single edge gun drill is widely used in deep hole machining, and small diameter single edge gun drill with a diameter of 1.0~1.2mm is usually used for processing shrimp pellet ring mold in ring mold processing, and the drill tip of the small diameter gun drill needs to be regrinded for many times in the processing process of hundreds of hours, and the grinding mode is manual grinding and automatic grinding. Manual grinding requires a very experienced tool grinding technician, and the quality is difficult to guarantee the repeatability and the tool head grinding waste is relatively large; automatic grinding usually uses domestic or imported 4-axis / 5-axis automatic tool grinder to implement, and the advantages are that the grinding amount is controllable, and the surface quality of the grinding is controllable.

[0003] But when the small diameter single edge gun drill below 1.5mm is automatically ground, the problems of poor grinding angle repeatability, poor clamping repeatability and limited grinding length are difficult to solve, and the reasons mainly include the following points:

[0004] 1. Small diameter high precision ER chuck is difficult to obtain;

[0005] 2. The gun drill tip profile is a non-symmetrical non-circular structure, which causes the chuck to shrink inconsistently, the precision decreases after repeated use, and the head of the drill with higher hardness can damage the inner hole of the ER chuck, resulting in loss of precision;

[0006] 3. The flexible small angle gap exists in the belt transmission of the main shaft transmission, and the grinding amount of the grinding surface on the small diameter gun drill is obviously affected;

[0007] 4. The overall profile size of the ER chuck is large, which is easy to interfere with the grinding wheel when grinding small diameter single edge gun drill, and the drill needs to be extended longer during grinding, resulting in very limited grinding length.

[0008] Therefore, a small diameter single edge gun drill grinding fixture is needed to improve the above problems. CONTENT OF THE UTILITY MODEL

[0009] The utility model aims at providing a small diameter single edge gun drill grinding fixture to solve the problems in the background art.

[0010] In order to achieve the above purpose, the utility model provides the following technical scheme:

[0011] The utility model provides a small diameter single edge gun drill grinding clamp, including servo motor, bearing seat, be connected with bearing seat between the servo motor, the inside of bearing seat is provided with the main shaft, the output end of servo motor is matched with one end of main shaft and is docked, the inside of the front end of main shaft is provided with ER chuck, the outside of ER chuck is provided with nut a, and nut a is matched with the outside of the end of main shaft and is screwed to lock ER chuck and positioning sleeve, the inside of ER chuck is inserted with positioning sleeve, and the front end of positioning sleeve is provided with the protruding main shaft front end, and the front end of positioning sleeve is provided with the holding sleeve, and the inside of positioning sleeve is provided with the positioning hole, the drill shank fixing sleeve is inserted in the positioning hole, the front end of drill shank fixing sleeve is provided with the insertion hole, and the small diameter single edge gun drill is arranged in the insertion hole, and the front end of small diameter single edge gun drill extends to the outside through holding sleeve, the lower end of positioning sleeve and drill shank fixing sleeve is provided with a plurality of threaded holes, and positioning sleeve and drill shank fixing sleeve are fixedly connected through screw b, and the drill shank of small diameter single edge gun drill is fixedly connected through screw a between drill shank fixing sleeve.

[0012] As the preferred scheme of the utility model, the front end of the holding sleeve extends to the front end outside of the positioning sleeve, and the front end of the holding sleeve is provided with a long chamfer.

[0013] As the preferred scheme of the utility model, bearings b and a are arranged between the inside of the main shaft and the bearing seat, a spacer sleeve a and a spacer sleeve b are arranged between the bearings b and a, the spacer sleeve b is sleeved on the outside of the main shaft, the spacer sleeve a is sleeved on the outside of the spacer sleeve b, and the bearings b and a are arranged at the rear end and the front end of the bearing seat respectively.

[0014] As the preferred scheme of the utility model, the front end of the bearing seat is fixedly connected with an outer ring sealing flange through a screw b, and the inside of the outer ring sealing flange is provided with a sealing ring.

[0015] As the preferred scheme of the utility model, the rear end of the main shaft is matched and screwed with a nut b, a servo motor flange is arranged between the nut b and the bearing b, and the pre-tightening and locking of the bearings b and a are realized by rotating and adjusting the nut b.

[0016] As the preferred scheme of the utility model, the rear end of the main shaft is provided with an opening sleeve matched and docked with the output end of the servo motor, and the opening sleeve is provided with a screw a, and the output end of the servo motor inserted in the opening sleeve is locked through the screw a.

[0017] Compared with the prior art, the utility model has the beneficial effects that:

[0018] The utility model discloses a fixed sleeve and the fixed sleeve inner hole interference pressure into, the fixed sleeve inner diameter and small diameter single edge gun drill 1's outer diameter keep tiny gap, guarantee the concentricity of drill bit repeated clamping, realize rigid no -gap connection between servo motor output shaft and open sleeve, solve the influence of the gap of flexible transmission of belt to blade grinding angle, the whole not only is applicable to the grinding of small diameter single edge gun drill in ring mould processing, also is applicable to the blade grinding clamping of small diameter single edge gun drill in other occasions, effectively solve the grinding repeatability poor and the grinding length limited of small diameter single edge gun drill in automatic grinding process and so on, have remarkable precision repeatability, economy, innovativeness. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is the structural schematic diagram of the utility model;

[0020] Figure 2 It is the assembly schematic diagram of the positioning sleeve in the utility model;

[0021] Figure 3 It is the assembly schematic diagram of small diameter single edge gun drill in the utility model;

[0022] Figure 4 It is the utility model Figure 1 The section schematic diagram of B-B in the utility model;

[0023] Figure 5 It is the utility model Figure 1 The enlarged view of A.

[0024] In the drawing: small diameter single edge gun drill 1, screw a 2, drill handle fixed sleeve 3, fixed sleeve 4, positioning sleeve 5, screw b 6, ER chuck 7, nut a 8, main shaft 9, outer ring sealing flange 10, sealing ring 11, bearing a 12, spacer sleeve a 13, spacer sleeve b 14, bearing seat 15, bearing b 16, servo motor flange 17, nut b 18, connecting shell 19, open sleeve 20, screw a 21, servo motor 22. DETAILED DESCRIPTION

[0025] The technical scheme in the embodiments of the utility model will be described below in a clear and complete manner in conjunction with the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the utility model.

[0026] For the purpose of facilitating the understanding of the present application, the following will make a more comprehensive description of the present application with reference to relevant. Several embodiments of the present application are given. However, the present application can be realized in many different forms, and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0027] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there can be an intervening element. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or there can be an intervening element. The terms "vertical", "horizontal", "left", "right", and similar expressions used herein are for illustrative purposes only.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs. The terminology used in the description of the present application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0029] Please refer to Figures 1-5 , the present application provides a technical scheme:

[0030] Embodiment, please refer to Figure 1 , 2 , 3 and 4, a small diameter single edge gun drill grinding fixture, including servo motor 22, bearing seat 15, servo motor 22 and bearing seat 15 are connected with connecting shell 19, the inside of bearing seat 15 is provided with spindle 9, the output end of servo motor 22 is matched with one end of spindle 9, the inside of the front end of spindle 9 is provided with ER chuck 7, the outside of ER chuck 7 is provided with nut a8, nut a8 and the outside of the end of spindle 9 are matched with screw joint to realize locking of ER chuck 7 and positioning sleeve 5, the inside of ER chuck 7 is inserted and combined with positioning sleeve 5, the front end of positioning sleeve 5 protrudes the front end of spindle 9, and the front end of positioning sleeve 5 is provided with holding sleeve 4, positioning sleeve 5 is provided with positioning hole in the inside, drill shank fixing sleeve 3 is inserted and combined in the positioning hole, drill shank fixing sleeve 3 is provided with insertion hole in the front end, insertion hole is provided with small diameter single edge gun drill 1, the front end of small diameter single edge gun drill 1 extends to the outside through holding sleeve 4;The lower end of positioning sleeve 5 and drill shank fixing sleeve 3 is provided with a plurality of threaded holes, positioning sleeve 5 and drill shank fixing sleeve 3 are fixedly connected through screw b6, drill shank fixing sleeve 3 and the drill shank of small diameter single edge gun drill 1 are fixedly connected through screw a2.

[0031] The outer diameter of the holding sleeve 4 is pressed into the inner hole of the fixed sleeve 5 with interference, and then is precisely ground concentrically. The inner diameter of the holding sleeve 4 keeps a small gap (≤0.003mm) with the outer diameter of the small-diameter single-edge gun drill 1, which ensures the concentricity of the drill bit when clamped repeatedly. The holding sleeve 4 is made of hard alloy, which solves the problem that the precision cannot be maintained for a long time due to the damage of the drill bit to the chuck.

[0032] In the embodiment, the holding sleeve 4 is designed with a small diameter, a large extension, and a long chamfer, which avoids the interference between the grinding wheel and the outer diameter of the fixture, and the length of the tool that can be ground is doubled.

[0033] A plurality of tightening screw holes are arranged on the drill shank fixing sleeve 3 to facilitate the adjustment of drill bits of different lengths. A plurality of tightening screw holes are arranged on the fixing sleeve 3 to facilitate the adjustment of the length of the small-diameter drill bit 1 extending out of the holding sleeve 4.

[0034] Please refer to Figure 1 、 2 , 3 and 4. The front end of the holding sleeve 4 extends to the outside of the front end of the positioning sleeve 5, and the front end of the holding sleeve 4 is provided with a long chamfer.

[0035] The inner side between the main shaft 9 and the bearing seat 15 is provided with a bearing b16 and a bearing a12. The bearing b16 and the bearing a12 are provided with a spacer sleeve a13 and a spacer sleeve b14. The spacer sleeve b14 is sleeved on the outer side of the main shaft 9, and the spacer sleeve a13 is sleeved on the outer side of the spacer sleeve b14. The bearing b16 and the bearing a12 are arranged at the rear end and the front end of the bearing seat 15, respectively. The front end of the bearing seat 15 is fixedly connected with an outer ring sealing flange 10 through a screw b, and the inner side of the outer ring sealing flange 10 is provided with a sealing ring 11.

[0036] The rear end of the main shaft 9 is matched and screwed with a nut b18, and a servo motor flange 17 is arranged between the nut b18 and the bearing b16. The pre-tightening and locking of the bearing b16 and the bearing a12 are realized by rotating and adjusting the nut b18. The rear end of the main shaft 9 is provided with an open sleeve 20 which is matched and docked with the output end of the servo motor 22. The open sleeve 20 is provided with a screw a21, and the output end of the servo motor 22 which is inserted into the open sleeve 20 is locked through the screw a21.

[0037] The tail end of the main shaft 9 is designed with axial and radial slots. When installed, the screw 21 eliminates the small gap between the output shaft of the servo motor 22 and the open sleeve 20 through the micro-deformation of the tail end of the main shaft, realizes rigid and gapless connection, and solves the influence of the gap caused by the flexible transmission of the belt on the grinding angle in the prior art. In the embodiment, the main shaft 9 and the open sleeve 20 are both precisely machined.

[0038] Although the embodiments of the present application have been shown and described, it is to be understood that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A small-diameter single-blade gun drill grinding clamp, comprising a servo motor (22), a bearing seat (15), a connecting shell (19) connected between the servo motor (22) and the bearing seat (15), a main shaft (9) arranged in the bearing seat (15), an output end of the servo motor (22) matched and docked with one end of the main shaft (9), an ER chuck (7) arranged in the front end of the main shaft (9), a nut a (8) arranged on the outer side of the ER chuck (7), and the nut a (8) and the outer side of the end of the main shaft (9) are matched and screwed to lock the ER chuck (7) and a positioning sleeve (5), characterized in that: The inside of the ER chuck (7) is provided with a positioning sleeve (5), the front end of the positioning sleeve (5) protrudes from the front end of the main shaft (9), the front end of the positioning sleeve (5) is provided with a holding sleeve (4), the inside of the positioning sleeve (5) is provided with a positioning hole, the inside of the positioning hole is provided with a drill handle fixing sleeve (3), the front end of the drill handle fixing sleeve (3) is provided with a socket, the socket is provided with a small-diameter single-blade gun drill (1), the front end of the small-diameter single-blade gun drill (1) extends to the outside through the holding sleeve (4); ​ The lower end of the positioning sleeve (5) and the drill handle fixing sleeve (3) is provided with a plurality of threaded holes, the positioning sleeve (5) and the drill handle fixing sleeve (3) are fixedly connected through the screw b (6), the drill handle fixing sleeve (3) and the drill handle of the small-diameter single-blade gun drill (1) are fixedly connected through the screw a (2).

2. The small diameter single-lip gun drill grinding fixture of claim 1, wherein: The front end of the holding sleeve (4) extends to the front end of the positioning sleeve (5), and the front end of the holding sleeve (4) is provided with a long chamfer.

3. The small diameter single-lip gun drill grinding fixture of claim 2 wherein: The inside of the main shaft (9) and the bearing seat (15) is provided with a bearing b (16) and a bearing a (12), the bearing b (16) and the bearing a (12) are provided with a spacer sleeve a (13) and a spacer sleeve b (14), the spacer sleeve b (14) is sleeved on the outside of the main shaft (9), the spacer sleeve a (13) is sleeved on the outside of the spacer sleeve b (14), the bearing b (16) and the bearing a (12) are respectively arranged at the rear end and the front end of the bearing seat (15).

4. The small diameter single-lip gun drill grinding fixture of claim 3 wherein: The front end of the bearing seat (15) is fixedly connected with an outer ring sealing flange (10) through a screw b, and the inside of the outer ring sealing flange (10) is provided with a sealing ring (11).

5. The small diameter single-lip gun drill grinding fixture of claim 4 wherein: The rear end of the main shaft (9) is matched and screwed with a nut b (18), and the nut b (18) and the bearing b (16) are provided with a servo motor flange (17), the pre-tightening and locking of the bearing b (16) and the bearing a (12) are realized by rotating and adjusting the nut b (18).

6. The small diameter single-lip gun drill grinding fixture of any of claims 1-5, wherein: The rear end of the main shaft (9) is provided with an open sleeve (20) matched with the output end of the servo motor (22), the open sleeve (20) is provided with a screw a (21), and the output end of the servo motor (22) inserted into the open sleeve (20) is locked through the screw a (21).

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