Sheet material drilling machine drill bit holder

Abstract

The utility model discloses a sheet material drilling machine drill fixing device, including connecting seat, locking sleeve and chuck: connecting seat bottom surface is equipped with assembly cavity, and the cavity bottom is equipped with the connecting hole with female screw and forms the limiting step with assembly cavity, locking sleeve movable assembly is in assembly cavity, and the top is against the limiting step, and the bottom of cylinder cavity is equipped with first inclined wedge surface, and the top is equipped with linkage key, chuck is inserted in locking sleeve cylinder cavity, and the top is equipped with the threaded connection of outer thread screw joint bar and connecting hole, and the outer wall is equipped with linkage recess and key joint and realizes the circumferential locking, and the bottom is equipped with interval groove and forms a plurality of clamping parts, and the second inclined wedge surface of clamping part outside side and first inclined wedge surface are against and produce the clamping force fixed tool. The utility model discloses through the inclined surface self -lock structure realizes the quick clamping of drill, promotes the coaxiality and processing accuracy, avoids the deflection problem caused by bolt fastening, has the characteristics such as convenient operation, strong adaptability, durable and reliable, is applicable to the stable clamping of various specifications cutters.

Description

Technical Field

[0001] This utility model relates to the field of sheet drilling machine technology, and in particular to a drill bit fixing device for a sheet drilling machine. Background Technology

[0002] Sheet drilling machines are widely used in industries such as electronics and machinery manufacturing. The performance of their drill bit fixing devices directly affects drilling quality and production efficiency. Currently, existing sheet drilling machines typically use bolts for drill bit fixing. When using bolt fixing, multiple manual adjustments and tightening of bolts are required to secure the drill bit. In practice, because the bolt tightening force is difficult to control precisely, it easily leads to coaxiality deviation between the drill bit and the spindle, resulting in large hole diameter errors and rough hole walls. This affects the sheet processing accuracy and product quality, thus necessitating improvement. Utility Model Content

[0003] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a drill bit fixing device for sheet drilling machine, so as to realize the quick clamping installation of drill bit, improve its tooling accuracy, and reduce the drilling error of the equipment.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a drill bit fixing device for a sheet drilling machine, comprising a connecting seat, a locking sleeve, and a chuck. The bottom surface of the connecting seat has an assembly cavity, and the bottom of the assembly cavity has an internally and externally penetrating connecting hole. The inner wall of the connecting hole is formed with an internal thread, and the inner diameter of the connecting hole is smaller than that of the assembly cavity, forming a limiting step between them. The locking sleeve is movably assembled in the assembly cavity, with a clearance fit between the outer wall of the locking sleeve and the inner wall of the assembly cavity. The top of the locking sleeve is movably abutted against the limiting step. A first inclined wedge is formed at the bottom opening of the locking sleeve cavity, and at least one linkage protrusion is formed at the top of the locking sleeve cavity. The chuck is movably inserted into the locking sleeve. The chuck has a threaded rod at the top, with external threads formed on its outer wall. The threaded rod is threaded into a connecting hole. At least one recessed linkage groove is formed on the top of the outer wall of the chuck. The linkage groove engages with a corresponding linkage key to achieve circumferential locking between the chuck and the locking sleeve. The interior of the chuck is hollowed out to form a drill bit connection cavity for inserting the cutting tool. At least two spacer slots are formed at the bottom of the chuck along the circumferential direction. The spacer slots extend along the axial direction of the chuck and form at least two clamping parts. A second inclined wedge is formed on the outer side of the clamping part. The second inclined wedge and the first inclined wedge are movably abutted together to achieve a clamping force towards the center for each clamping part, thereby clamping the cutting tool.

[0005] In a further technical solution, the bottom of the connector is provided with a connector for connecting the output shaft, and the connectors are spaced apart along the circumferential direction.

[0006] In a further technical solution, notches for wrench turning are formed on both sides of the outer wall of the locking sleeve.

[0007] In a further technical solution, the mating surface between the first and second inclined wedges forms a mating angle with the axis of the clamp, which is 10-25 degrees.

[0008] In a further technical solution, the extension length d of the spacer groove is 2cm-4cm.

[0009] In a further technical solution, the diameter of the drill bit connection cavity is 2mm-15mm.

[0010] In a further technical solution, the projected shape of the clamping part is fan-shaped, and the inner part forms a clamping mating part. The edge of the clamping mating part is formed with a toothed groove structure to enhance the clamping friction.

[0011] In a further technical solution, the locking sleeve is made of SUS416 stainless steel or 2205 duplex stainless steel, with a wall thickness of 1.5mm-2.5mm.

[0012] In a further technical solution, the chuck is made of EN1.4568 stainless steel with a yield strength of 800MPa-1200MPa.

[0013] The advantages of this invention compared to the prior art after adopting the above structure are:

[0014] 1. Through the inclined surface fit structure between the locking sleeve and the chuck, the clamping part can be driven to retract and clamp the tool simply by rotating the locking sleeve, without the need to tighten the bolts one by one, which greatly shortens the drill bit change time and improves tooling efficiency.

[0015] 2. The chuck achieves axial positioning through the threaded connection between the threaded rod and the connecting hole. The snap-fit ​​design of the linkage protrusion and linkage groove ensures that the chuck and locking sleeve are circumferentially fixed, avoiding the drill bit deflection problem caused by uneven force in traditional bolt fastening. This significantly improves the coaxiality of the drill bit and spindle, reduces drilling diameter error and hole wall roughness, and improves sheet material processing accuracy.

[0016] 3. The second inclined wedge surface on the outer side of the clamping part and the first inclined wedge surface of the locking sleeve form a wedge-shaped self-locking structure. When clamping the tool, the inclined surfaces interact to generate a clamping force pointing towards the center. This force gradually increases with the clamping action, and a stable clamping state can be maintained without continuously applying external force, thus preventing the tool from loosening. Attached Figure Description

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0018] Figure 1This is a schematic diagram of the structure of this utility model.

[0019] Figure 2 This is a schematic diagram of the chuck in this utility model.

[0020] Figure 3 This is a schematic diagram of the structure of this utility model. Detailed Implementation

[0021] The following are merely preferred embodiments of the present invention and do not limit the scope of protection of the present invention.

[0022] A drill bit fixing device for a sheet drilling machine includes a connecting seat 2, a locking sleeve 3, and a chuck 4. The bottom surface of the connecting seat 2 has an assembly cavity 20, and the bottom of the assembly cavity 20 has a through-hole 201. The inner wall of the through-hole 201 is formed with an internal thread, and the inner diameter of the through-hole 201 is smaller than that of the assembly cavity 20, forming a limiting step between them. The locking sleeve 3 is movably mounted in the assembly cavity 20, with a clearance fit between the outer wall of the locking sleeve 3 and the inner wall of the assembly cavity 20. The top of the locking sleeve 3 is movably abutted against the limiting step. A first inclined wedge surface 32 is formed at the bottom opening of the cavity of the locking sleeve 3, and at least one linkage protrusion 301 is formed on the top of the cavity of the locking sleeve 3. The chuck 4 is movably inserted into the cavity of the locking sleeve 3, and a threaded rod 41 is provided on the top of the chuck 4. The outer wall of the connecting rod 41 is formed with external threads, and the threaded rod 41 is threaded into the connecting hole 201; the top of the outer wall of the chuck 4 is formed with at least one recessed linkage groove 401, which engages with the corresponding linkage protrusion 301 to achieve circumferential locking between the chuck 4 and the locking sleeve 3; the interior of the chuck 4 is hollowed out to form a drill bit connecting cavity 40 for inserting the cutting tool 5; the bottom of the chuck 4 is provided with at least two spacer grooves 43 along the circumferential direction, which extend along the axial direction of the chuck 4 and form at least two clamping parts 42; the outer side of the clamping part 42 is formed with a second inclined wedge surface 420, which movably abuts against the first inclined wedge surface 32 to achieve a clamping force towards the center for each clamping part 42, thereby clamping the cutting tool 5.

[0023] With the inclined surface cooperation structure between the locking sleeve 3 and the chuck 4, the clamping part 42 can be driven to retract and clamp the tool 5 simply by rotating the locking sleeve 3, without the need to tighten the bolts one by one, which greatly shortens the drill bit replacement time and improves tooling efficiency.

[0024] The chuck 4 achieves axial positioning through the threaded connection between the threaded rod 41 and the connecting hole 201. The snap-fit ​​design of the linkage protrusion 301 and the linkage groove 401 ensures that the chuck and the locking sleeve 3 are circumferentially fixed, avoiding the problem of drill bit deflection caused by uneven force due to traditional bolt fastening. This significantly improves the coaxiality of the drill bit and the spindle, reduces drilling diameter error and hole wall roughness, and improves sheet material processing accuracy.

[0025] The second inclined wedge surface 420 on the outer side of the clamping part 42 and the first inclined wedge surface 32 of the locking sleeve 3 form a wedge-shaped self-locking structure. When clamping the tool, the inclined surfaces interact to generate a clamping force pointing towards the center. This force gradually increases with the clamping action, and a stable clamping state can be maintained without continuously applying external force, thus preventing the tool 5 from loosening.

[0026] Specifically, the bottom of the connector 2 is provided with a connector port 1 for connecting the output shaft, and the connector ports 1 are distributed at intervals along the circumferential direction.

[0027] Specifically, notches for turning with a wrench are formed on both sides of the outer wall of the locking sleeve 3.

[0028] Specifically, the mating surface between the first inclined wedge surface 32 and the second inclined wedge surface 420 forms a mating angle with the axis of the chuck 4, and the mating angle is 12 degrees.

[0029] Specifically, the extension length d of the spacer 43 is 3cm.

[0030] Specifically, the diameter of the drill bit connecting cavity 40 is 4mm. Different specifications of chucks 4 have drill bit connecting cavities 40 with different diameters to accommodate different specifications of cutting tools 5.

[0031] Specifically, the projected shape of the clamping part 42 is fan-shaped, and a clamping mating part is formed on its inner side. The edge of the clamping mating part is formed with a toothed groove structure 421 to enhance the clamping friction.

[0032] Specifically, the locking sleeve 3 is made of 2205 duplex stainless steel with a wall thickness of 1.8 mm.

[0033] Specifically, the chuck 4 is made of EN1.4568 stainless steel with a yield strength of 1100MPa.

[0034] The above description is only a preferred embodiment of this utility model. For those skilled in the art, there will be changes in the specific implementation method and application scope based on the idea of ​​this utility model. The content of this specification should not be construed as a limitation of this utility model.

Claims

1. A drill bit fixing device for a sheet drilling machine, characterized in that: It includes a connecting seat (2), a locking sleeve (3), and a chuck (4). The bottom surface of the connecting seat (2) is provided with an assembly cavity (20), and the bottom of the assembly cavity (20) is provided with an internal and external through connecting hole (201). The inner wall of the connecting hole (201) is formed with an internal thread, and the inner diameter of the connecting hole (201) is smaller than that of the assembly cavity (20), forming a limiting step between the two. The locking sleeve (3) is movably assembled in the assembly cavity (20). The outer wall of the locking sleeve (3) is clearance-fitted with the inner wall of the assembly cavity (20). The top of the locking sleeve (3) is movably abutted against the limiting step. A first inclined wedge surface (32) is formed at the bottom opening of the cylinder cavity of the locking sleeve (3). At least one linkage protrusion (301) is formed on the top of the cylinder cavity of the locking sleeve (3). The collet (4) is movably inserted into the cavity of the locking sleeve (3). The top of the collet (4) is provided with a threaded rod (41). The outer wall of the threaded rod (41) is formed with external threads. The threaded rod (41) is threaded into the connecting hole (201). The top of the outer wall of the collet (4) is formed with at least one recessed linkage groove (401). The linkage groove (401) engages with the corresponding linkage key (301) to achieve circumferential locking between the collet (4) and the locking sleeve (3). The interior of the collet (4) is hollowed out. The drill bit connection cavity (40) is used to insert the cutting tool (5). At least two spacer grooves (43) are provided at the bottom of the chuck (4) along the circumferential direction. The spacer grooves (43) extend along the axial direction of the chuck (4) and form at least two clamping parts (42). A second inclined wedge surface (420) is formed on the outer side of the clamping part (42). The second inclined wedge surface (420) and the first inclined wedge surface (32) are movably abutted and engaged to realize that each clamping part (42) has a clamping force toward the center, thereby clamping the cutting tool (5).

2. A sheet material punch bit holder as defined in claim 1, wherein: The bottom of the connector (2) is provided with a connector (1) for connecting the output shaft, and the connectors (1) are spaced apart along the circumferential direction.

3. A sheet material punch bit holder as defined in claim 2, wherein: The outer walls of the locking sleeve (3) are respectively formed with notches for wrench turning on both sides.

4. A sheet material punch bit holder as defined in claim 1, wherein: The abutting mating surface between the first inclined wedge surface (32) and the second inclined wedge surface (420) forms an abutting mating angle with the axis of the clamp (4), and the abutting mating angle is 10 degrees to 25 degrees.

5. A sheet material drill fixture as defined in claim 1 wherein: The extension length d of the spacer groove (43) is 2cm-4cm.

6. A sheet material punch bit holder as defined in claim 1, wherein: The diameter of the drill bit connecting cavity (40) is 2mm-15mm.

7. A sheet material punch bit holder as defined in claim 1, wherein: The projected shape of the clamping part (42) is fan-shaped, and the inner side of it forms a clamping mating part. The edge of the clamping mating part is formed with a toothed groove structure (421) to enhance the clamping friction.

8. A sheet material punch bit holder as defined in claim 1, wherein: The locking sleeve (3) is made of SUS416 stainless steel or 2205 duplex stainless steel, and its wall thickness is 1.5mm-2.5mm.

9. A sheet material punch bit holder as defined in claim 1, wherein: The chuck (4) is made of EN1.4568 stainless steel with a yield strength of 800MPa-1200MPa.

Images