A quick-change device for a tool holder for finishing eccentric shafts

Abstract

The application discloses a quick-change device for a tool rest for eccentric shaft finishing, and belongs to the field of lathe tool rests. The quick-change device for the tool rest for eccentric shaft finishing comprises a tool rest body, a tool holder fixedly installed on the tool rest body and used for clamping a tool, a dividing shaft longitudinally penetrating through the center of the tool rest body and used for being connected with an external tool rest assembly, a pressing handle screwed at the top end of the dividing shaft and used for locking the tool rest body on the tool holder assembly, and a locking mechanism arranged on the tool rest body and used for locking the tool holder. The tool rest body is provided with dovetail grooves on two adjacent sides. The quick-change device for the tool rest for eccentric shaft finishing is provided with a height limiting mechanism. After the height of the tool holder is adjusted for the first time, the height does not need to be determined again through rotating an adjusting screw or the like when the tool holder is replaced subsequently. The new tool holder can be directly installed on the lifting support plate with the adjusted height, so that the tool changing time is greatly saved, and the overall efficiency during the eccentric shaft finishing is improved.

Description

Technical Field

[0001] This application relates to the field of lathe tool post technology, specifically a quick-change device for a tool post used in the finishing of an eccentric shaft. Background Technology

[0002] The lathe tool post is one of the core components of a lathe, used to fix and support the cutting tool. By precisely controlling the position and angle of the tool, it enables rotary cutting of the workpiece. It is a key device for the lathe to achieve various machining functions (such as turning, drilling, reaming, etc.), and directly affects machining accuracy, efficiency, and tool stability.

[0003] In the finishing of eccentric shafts, multiple tool changes are typically required, and precise tool positioning must be ensured each time. Traditional American quick-change toolholders consist of a toolholder body, a tool holder mounted on the toolholder body, an eccentric locking shaft for securing the tool holder to the toolholder body, and an adjusting screw on the tool holder for adjusting the height of the tool holder on the toolholder body. When changing the tool holder, each tool change requires manually loosening the eccentric shaft, replacing the tool holder, adjusting the height, and retightening. The height adjustment process, in particular, determines the positioning accuracy of the tool head. However, the adjusting screw is attached to the tool holder, so after each tool change, the height must be determined by rotating the adjusting screw on the new tool holder. This process is time-consuming and affects the overall efficiency of eccentric shaft finishing.

[0004] Therefore, this application provides a quick-change tool holder for finishing eccentric shafts to solve the above problems. Utility Model Content

[0005] This application provides a quick-change tool holder for finishing eccentric shafts, which aims to solve the existing problems mentioned in the background art.

[0006] To achieve the above objectives, this application provides the following technical solution: a quick-change device for a tool holder in precision machining of an eccentric shaft, comprising a tool holder body, a tool holder clamp fixedly mounted on the tool holder body for holding a tool, an indexing shaft longitudinally penetrating the center of the tool holder body for connecting to an external tool holder assembly, a clamping handle screwed to the top of the indexing shaft for locking the tool holder body onto the tool holder assembly, and a locking mechanism provided on the tool holder body for locking the tool holder. The tool holder body has dovetail grooves on adjacent sides, and a height limiting mechanism is provided at a position corresponding to the lower part of the dovetail groove on the tool holder body. The height limiting mechanism includes an L-shaped bracket fixedly connected to the position corresponding to the lower part of the dovetail groove on the tool holder body, a lifting plate that moves longitudinally inside the dovetail groove for contacting the bottom surface of the tool holder, a pair of sliding rods symmetrically fixed at both ends of the lifting plate and penetrating the L-shaped bracket, a connecting plate fixedly connected to the bottom ends of the two sliding rods, and an adjusting bolt rotatably connected to the bottom of the L-shaped bracket and screwed to the connecting plate. In this way, by setting up a height limiting mechanism, after the tool holder height is adjusted for the first time, it is not necessary to readjust the height by rotating the adjusting screw when changing the tool holder. Simply install the new tool holder onto the lifting plate that has been adjusted to the correct height. This greatly saves tool changing time and improves the overall efficiency of eccentric shaft finishing.

[0007] Preferably, the tool holder has a dovetail collet corresponding to the dovetail groove, and a tool holder groove for placing the tool holder is provided on the side of the tool holder away from the dovetail collet. At least three sets of clamping bolts extending into the tool holder groove are screwed to the top of the tool holder for clamping the tool.

[0008] Preferably, all the slide rods are slidably connected to the L-shaped bracket.

[0009] Preferably, a clamping pad is fitted outside the indexing shaft between the clamping handle and the top surface of the tool holder body.

[0010] Preferably, the locking mechanism includes a first and a second slide groove respectively communicating with and intersecting the two dovetail grooves within the tool holder body; a first and a second locking shaft respectively sliding within the first and second slide grooves; a first and a second rectangular slider respectively fixed to the front ends of the first and second locking shafts and moving closer to or further away from the corresponding dovetail chucks; a first and a second clamping flap respectively fixed to the front ends of the first and second rectangular sliders and engaging with the sidewalls of the dovetail grooves to clamp the sidewalls of the dovetail chucks; a first and a second threaded connector respectively fixed to the tail ends of the first and second locking shafts and extending to the outside of the tool holder body; and a first and a second locking handle respectively screwed to the tail ends of the first and second threaded connectors and contacting the tool holder body to pull the first and second locking shafts respectively.

[0011] Preferably, the side of the first locking shaft is provided with a movable waist hole that allows the second locking shaft to pass through and allows the first locking shaft to slide relative to the second locking shaft.

[0012] Preferably, the side of the tool holder body is provided with a first rectangular groove and a second rectangular groove that are connected to the first sliding groove and the second sliding groove for sliding of the first rectangular slider and the second rectangular slider.

[0013] Preferably, the top of the tool holder body is screwed with a first locking bolt and a second locking bolt at positions corresponding to the positions above the first rectangular slider and the second rectangular slider, respectively, for securing the first rectangular slider and the second rectangular slider.

[0014] Preferably, both the first locking handle and the second locking handle have clamping washers fitted onto the outside of the first screw joint and the outside of the second screw joint, respectively, between them and the tool holder body.

[0015] This quick-change tool holder for eccentric shaft finishing, through the setting of a height limiting mechanism, eliminates the need to readjust the height by rotating the adjusting screw when changing the tool holder after the initial adjustment. Simply install the new tool holder onto the already adjusted lifting plate, which greatly saves tool changing time and improves the overall efficiency of eccentric shaft finishing.

[0016] This quick-change tool holder for precision machining of eccentric shafts can precisely control the clamping or loosening of the first and second clamping plates on the corresponding dovetail chucks by operating the first and second locking handles respectively. It will not cause the tool holders on both sides to be unlocked simultaneously due to misoperation, which greatly improves the accuracy and reliability of tool changing, reduces the tediousness of tool changing, and further improves tool changing efficiency. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of a quick-change tool holder for finishing eccentric shafts. Figure 2 This is a schematic diagram of the separate structure of the tool holder body and the tool clip of a quick-change device for precision machining of an eccentric shaft; Figure 3 This is an exploded structural diagram of the tool holder body of a quick-change tool holder device for finishing eccentric shafts.

[0018] In the picture: 1. Tool holder body; 11. Dovetail groove; 12. First sliding groove; 121. First rectangular groove; 13. Second slide groove; 131. Second rectangular groove; 2. Tool holder; 21. Dovetail chuck; 22. Tool holder groove; 23. Clamping bolt; 3. Indexing shaft; 4. Clamping handle; 5. Height limiting mechanism; 51. L-shaped bracket; 52. Lifting platform; 53. Slide rod; 54. Connecting plate; 55. Adjusting bolt; 6. Locking mechanism; 61. First locking shaft; 611. First rectangular slider; 612. First clamping flap; 613. First threaded connector; 614. First locking handle; 615. Movable waist hole; 62. Second locking shaft; 621. Second rectangular slider; 622. Second clamping flap; 623. Second screw connector; 624. Second locking handle; 63. First locking bolt; 64. Second locking bolt. Detailed Implementation

[0019] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0020] Example 1 This embodiment provides a quick-change device for a tool holder used in the finishing of an eccentric shaft, such as... Figures 1-3 As shown, the quick-change tool holder for finishing eccentric shafts includes a tool holder body 1, a tool holder 2 fixedly mounted on the tool holder body 1 for holding the tool, an indexing shaft 3 extending longitudinally through the center of the tool holder body 1 for connecting to an external tool holder assembly, a clamping handle 4 screwed to the top of the indexing shaft 3 for locking the tool holder body 1 onto the tool holder assembly, and a locking mechanism 6 provided on the tool holder body 1 for locking the tool holder 2. The tool holder body 1 has dovetail grooves 11 on adjacent sides, and a height limiting mechanism is provided at a position corresponding to the dovetail grooves 11 on the tool holder body 1. 5. The height limiting mechanism 5 includes an L-shaped bracket 51 fixedly connected to the position below the dovetail groove 11 of the tool holder body 1, a lifting plate 52 that moves longitudinally inside the dovetail groove 11 to contact the bottom surface of the tool clip 2, a pair of sliding rods 53 symmetrically fixed at both ends of the lifting plate 52 and passing through the L-shaped bracket 51, a connecting plate 54 fixedly connected to the bottom of the two sliding rods 53, and an adjusting bolt 55 rotatably connected to the bottom of the L-shaped bracket 51 and screwed to the connecting plate 54. The sliding rods 53 are all slidably connected to the L-shaped bracket 51.

[0021] During use, when installing the tool holder 2, slide the tool holder 2 into place along the dovetail groove 11 on the tool holder body 1, at which point the bottom surface of the tool holder 2 contacts the upper surface of the lifting support plate 52. According to the machining requirements, rotate the adjusting bolt 55. The adjusting bolt 55 drives the connecting plate 54 to move up and down, and the connecting plate 54 drives the lifting support plate 52 to move up and down via the sliding rod 53, thereby adjusting the tool holder 2 to a suitable height to ensure the positioning accuracy of the tool. After the height adjustment is completed, use the locking mechanism 6 to lock the tool holder 2 onto the tool holder body 1 to prevent the tool holder 2 from moving during operation. Connect the indexing shaft 3 to the external tool holder assembly. Connect the parts, then rotate and tighten the handle 4 to lock the tool holder body 1 onto the tool holder assembly, ensuring the entire tool holder quick change device is in a stable working state. When it is necessary to replace the tool holder 2, first loosen the locking mechanism 6, slide the original tool holder 2 out of the dovetail groove 11, and then slide the new tool holder 2 into place along the dovetail groove 11. Since the height limit mechanism 5 has been adjusted in advance, there is no need to readjust the height after the new tool holder 2 is installed. Simply use the locking mechanism 6 to lock the new tool holder 2, and then rotate and tighten the handle 4 to lock the tool holder body 1. This will quickly complete the tool holder replacement, allowing you to continue the finishing of the eccentric shaft.

[0022] Specifically, the tool holder 2 has a dovetail collet 21 corresponding to the dovetail groove 11. A tool holder groove 22 for placing the tool shank is provided on the side of the tool holder 2 away from the dovetail collet 21. At least three sets of clamping bolts 23 extending into the tool holder groove 22 are screwed to the top of the tool holder 2 for clamping the tool. When installing the tool holder 2, the dovetail collet 21 is slid in along the guide of the dovetail groove 11. The special shape of the dovetail groove 11 can accurately position and guide the dovetail collet 21, so that the tool holder 2 can be accurately installed in the designated position of the tool holder body 1, and to a certain extent, the horizontal movement of the tool holder 2 is restricted. Then, through the combined action of multiple sets of clamping bolts 23, uniform pressure can be applied to the tool shank from different positions to firmly fix the tool on the tool holder 2 and prevent the tool from loosening or falling off during operation.

[0023] Furthermore, a clamping pad fitted outside the indexing shaft 3 is provided between the clamping handle 4 and the top surface of the tool holder body 1. The clamping pad increases the contact area between the clamping handle 4 and the top surface of the tool holder body 1. During the clamping process, the pressure can be more evenly distributed to the top surface of the tool holder body 1 through the clamping pad, avoiding damage to the top surface of the tool holder body 1 due to excessive local pressure, and also improving the stability and reliability of clamping.

[0024] Example 2 Unlike Embodiment 1, the eccentric locking shaft used in traditional quick-change tool holders may over-rotate when unlocking the bolts on different sides, causing adjacent tool holders to unlock simultaneously. This results in poor targeting, increasing the complexity of tool changing and further affecting tool changing efficiency. Therefore, the locking mechanism 6 includes a first slide groove 12 and a second slide groove 13 respectively connected to and intersecting with two dovetail grooves 11 within the tool holder body 1; a first locking shaft 61 and a second locking shaft 62 respectively sliding within the first slide groove 12 and the second slide groove 13; a first rectangular slider 611 and a second rectangular slider 621 respectively fixed to the front ends of the first locking shaft 61 and the second locking shaft 62, which move closer to or away from the corresponding dovetail chuck 21; and the front ends of the first rectangular slider 611 and the second rectangular slider 621 respectively fixed to the side wall of the dovetail groove 11 to clamp the dovetail chuck 2. The tool holder body 1 has a first clamping flap 612 and a second clamping flap 622 on one side, a first screw joint 613 and a second screw joint 623 respectively fixed to the tail ends of the first locking shaft 61 and the second locking shaft 62 and both extending to the outside of the tool holder body 1, and a first locking handle 614 and a second locking handle 624 respectively screwed to the tail ends of the first screw joint 613 and the second screw joint 623 and both in contact with the tool holder body 1 to pull the first locking shaft 61 and the second locking shaft 62 respectively. The first locking shaft 61 has a movable waist hole 615 on its side to allow the second locking shaft 62 to pass through and to allow the first locking shaft 61 to slide relative to the second locking shaft 62. The tool holder body 1 has a first rectangular groove 121 and a second rectangular groove 131 respectively connected to the first sliding groove 12 and the second sliding groove 13 for sliding the first rectangular slider 611 and the second rectangular slider 621.

[0025] In use, after the tool holder 2 is installed into the dovetail groove 11 of the tool holder body 1, the first locking handle 614 and the second locking handle 624 are rotated respectively. Since the first locking handle 614 is screwed to the first threaded connector 613 and the second locking handle 624 is screwed to the second threaded connector 623, rotating the first locking handle 614 will pull the first threaded connector 613, thereby causing the first locking shaft 61 to slide in the first slide groove 12; similarly, rotating the second locking handle 624 will pull the second threaded connector 623, causing the second locking shaft 62 to slide in the second slide groove 13; when the first locking shaft 61 slides, it causes the first rectangular slider 611 to slide in the first rectangular groove 121. As the first rectangular slider 611 slides inward, it causes the first clamping flap 612 to move closer to the side of the corresponding dovetail chuck 21. When the second locking shaft 62 slides, it causes the second rectangular slider 621 to slide within the second rectangular groove 131. The second rectangular slider 621 causes the second clamping flap 622 to move closer to the side of the corresponding dovetail chuck 21. Finally, the first clamping flap 612 and the second clamping flap 622 are tightly fitted with the sides of the corresponding dovetail chuck 21, clamping their respective dovetail chucks 21, thereby locking the corresponding tool holder 2. The movable slot 615 on the side of the first locking shaft 61 allows the second locking shaft 62 to pass through and enables the first locking shaft 61 to... The two locking shafts can slide independently relative to the second locking shaft 62, so that they do not interfere with each other during operation and can lock the corresponding side of the tool holder 2 respectively. When the tool holder 2 needs to be replaced, the first locking handle 614 or the second locking handle 624 is rotated in the opposite direction. The first locking handle 614 rotates in the opposite direction to push the first screw joint 613, so that the first locking shaft 61 slides in the opposite direction in the first slide groove 12, causing the first rectangular slider 611 and the first clamping petal 612 to move away from the side of the corresponding dovetail chuck 21. The second locking handle 624 rotates in the opposite direction to push the second screw joint 623, so that the second locking shaft 62 slides in the opposite direction in the second slide groove 13, causing the second rectangular slider 611 and the first clamping petal 612 to move away from the side of the corresponding dovetail chuck 21. Block 621 and the second clamping petal 622 are moved away from the side of the corresponding dovetail chuck 21. When both the first clamping petal 612 and the second clamping petal 622 are moved away from the side of the dovetail chuck 21, the locking state of the tool clip 2 is released. At this time, the tool clip 2 can be taken out from the dovetail groove 11 for replacement. By operating the first locking handle 614 and the second locking handle 624 respectively, the clamping or loosening of the first clamping petal 612 and the second clamping petal 622 on the corresponding dovetail chuck 21 can be precisely controlled. There will be no situation where adjacent tool clips 2 are unlocked at the same time due to misoperation, which greatly improves the accuracy and reliability of tool replacement, reduces the tediousness of tool replacement, and further improves tool replacement efficiency.

[0026] Furthermore, at the top of the tool holder body 1, corresponding to the positions above the first rectangular slider 611 and the second rectangular slider 621, a first locking bolt 63 and a second locking bolt 64 are respectively screwed on to secure the first rectangular slider 611 and the second rectangular slider 621; the first locking bolt 63 and the second locking bolt 64 apply pressure to the first rectangular slider 611 and the second rectangular slider 621 from the vertical direction, further locking the first rectangular slider 611 and the second rectangular slider 621, improving the stability of the tool holder 2 after locking, and preventing loosening during processing.

[0027] Furthermore, both the first locking handle 614 and the second locking handle 624 have clamping washers fitted onto the outside of the first screw joint 613 and the second screw joint 623 between themselves and the tool holder body 1. The clamping washers can increase the contact area between the first locking handle 614, the second locking handle 624 and the tool holder body 1, and evenly distribute the pressure generated during locking, avoiding damage to the tool holder body 1 or the locking handle due to excessive local pressure, and extending the service life of the tool holder body 1 and the locking handle.

[0028] The above description is merely a preferred embodiment of this application, but the scope of protection of this application is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in this application, based on the technical solution and concept of this application, should be included within the scope of protection of this application.

Claims

1. A quick-change tool holder for finishing eccentric shafts, comprising a tool holder body (1), a tool holder clamp (2) fixedly mounted on the tool holder body (1) for holding a tool, an indexing shaft (3) extending longitudinally through the center of the tool holder body (1) for connecting to an external tool holder assembly, a clamping handle (4) screwed to the top of the indexing shaft (3) for locking the tool holder body (1) onto the tool holder assembly, and a locking mechanism (6) disposed on the tool holder body (1) for locking the tool holder clamp (2), characterized in that: The tool holder body (1) has dovetail grooves (11) on both adjacent sides. The tool holder body (1) is provided with a height limiting mechanism (5) at the position below the dovetail groove (11). The height limiting mechanism (5) includes an L-shaped bracket (51) fixedly connected to the position below the dovetail groove (11) of the tool holder body (1), a lifting plate (52) that moves longitudinally inside the dovetail groove (11) to contact the bottom surface of the tool clip (2), a pair of sliding rods (53) symmetrically fixed at both ends of the lifting plate (52) and passing through the L-shaped bracket (51), a connecting plate (54) fixedly connected to the bottom end of the two sliding rods (53), and an adjusting bolt (55) rotatably connected to the bottom of the L-shaped bracket (51) and screwed to the connecting plate (54).

2. The quick-change tool holder for finishing eccentric shafts according to claim 1, characterized in that: The tool holder (2) has a dovetail chuck (21) corresponding to the dovetail groove (11). The tool holder (2) has a tool holder groove (22) for placing the tool holder on the side away from the dovetail chuck (21). The top of the tool holder (2) is screwed with at least three sets of clamping bolts (23) extending into the tool holder groove (22) for clamping the tool.

3. The quick-change device for tool holder in finishing eccentric shafts according to claim 2, characterized in that: The slide rods (53) are all slidably connected to the L-shaped brackets (51).

4. The quick-change tool holder for finishing eccentric shafts according to claim 3, characterized in that: The clamping handle (4) and the top surface of the tool holder body (1) have a clamping pad fitted outside the indexing shaft (3).

5. The quick-change device for tool holder in finishing eccentric shafts according to claim 4, characterized in that: The locking mechanism (6) includes a first slide groove (12) and a second slide groove (13) respectively connected to and intersecting the two dovetail grooves (11) in the tool holder body (1); a first locking shaft (61) and a second locking shaft (62) respectively sliding in the first slide groove (12) and the second slide groove (13); a first rectangular slider (611) and a second rectangular slider (621) respectively fixed to the front end of the first locking shaft (61) and the front end of the second locking shaft (62) and moving closer to or away from the corresponding dovetail chuck (21); and a front end of the first rectangular slider (611) and the second rectangular slider (621) respectively fixed to the front end of the second rectangular slider (621). The first clamping petal (612) and the second clamping petal (622) that fit into the side wall of the dovetail groove (11) to clamp the side of the dovetail chuck (21), the first screw joint (613) and the second screw joint (623) that are respectively fixed to the tail end of the first locking shaft (61) and the tail end of the second locking shaft (62) and both extend to the outside of the tool holder body (1), and the first locking handle (614) and the second locking handle (624) that are respectively screwed to the tail end of the first screw joint (613) and the tail end of the second screw joint (623) and both contact the tool holder body (1) to pull the first locking shaft (61) and the second locking shaft (62) respectively.

6. The quick-change tool holder for finishing eccentric shafts according to claim 5, characterized in that: The first locking shaft (61) has a movable waist hole (615) on its side to accommodate the passage of the second locking shaft (62) and allow the first locking shaft (61) to slide relative to the second locking shaft (62).

7. The quick-change tool holder for finishing eccentric shafts according to claim 6, characterized in that: The side of the tool holder body (1) is provided with a first rectangular groove (121) and a second rectangular groove (131) that are connected to the first sliding groove (12) and the second sliding groove (13) for sliding of the first rectangular slider (611) and the second rectangular slider (621).

8. The quick-change tool holder for finishing eccentric shafts according to claim 7, characterized in that: The top of the tool holder body (1) is screwed with a first locking bolt (63) and a second locking bolt (64) at the position above the first rectangular slider (611) and the second rectangular slider (621), respectively, for abutting against the first rectangular slider (611) and the second rectangular slider (621).

9. The quick-change tool holder for finishing eccentric shafts according to claim 8, characterized in that: Both the first locking handle (614) and the second locking handle (624) have clamping pads fitted around the outside of the first screw joint (613) and the outside of the second screw joint (623) between them and the tool holder body (1).

Images