Adjustable boring bar assembly

Abstract

This utility model provides an adjustable boring bar assembly structure, relating to the field of machine tool processing technology. It includes a boring bar and two tool head holders. Two adjusting screws are rotatably mounted on the top of the boring bar, and a clutch mechanism connects the adjusting screws. The clutch mechanism includes a transmission gear, a transmission gear ring, a clutch cone, a return spring, and a stop bolt. The two transmission gears mesh with each other. A meshing gear ring is provided at the front end of the clutch cone. The stop bolt is threaded onto the boring bar, and its front end slides against the side wall of the sliding cone. This utility model allows for independent adjustment of the two tool head holders to compensate for machine tool errors and maintain this compensation position. It also allows for synchronous adjustment of the tool head holder dimensions, avoiding the need for error compensation with each adjustment. The operation is gradual, fast, and precise.

Description

Technical Field

[0001] This utility model relates to the field of machine tool processing technology, specifically to an adjustable boring bar assembly structure. Background Technology

[0002] A boring bar is a type of boring tool suitable for machining internal holes. In machining production, some workpieces require the use of semi-precision tools to remove excess material from the hole due to the needs of the machining process.

[0003] For example, the invention patent with announcement number CN114012119A discloses a double-edged rough boring head, which drives two sliding assemblies to move synchronously through a first connecting key and a second connecting key, thereby realizing the linkage adjustment of the two cutting heads. In use, only the adjustment size of one cutting head needs to be ensured to complete the tool adjustment work, which greatly saves the adjustment time, improves the tool setting efficiency, and can better ensure the size adjustment accuracy.

[0004] However, the above technical solution is based on the premise that the machine tool spindle is absolutely concentric, the tool holder is without deviation, and the insert mounting slot is completely symmetrical. In reality, the radial runout of the machine tool spindle, the connection error between the tool holder and the spindle, and the manufacturing error of the boring tool body will all cause errors in the extension of the two tools, which will lead to the boring distortion. Utility Model Content

[0005] (a) Technical problems to be solved

[0006] To address the shortcomings of existing technologies, this utility model provides an adjustable boring bar assembly structure, which solves the problems mentioned in the background section.

[0007] (II) Technical Solution

[0008] To achieve the above objectives, this utility model provides the following technical solution:

[0009] An adjustable boring bar assembly includes a boring bar and two tool holders mounted on the top of the boring bar. The top of the boring bar has a mounting groove, in which two parallel adjusting screws are rotatably mounted. A clutch mechanism connects the two adjusting screws. The clutch mechanism includes a transmission gear, a transmission gear ring, a clutch cone, a return spring, and a stop bolt. The transmission gear is rotatably connected to the adjusting screws, and the two transmission gears mesh with each other. The transmission gear ring is integrally formed on the side of the transmission gear facing the clutch cone. The clutch cone is slidably sleeved on the adjusting screw. The front end of the clutch cone has a meshing gear ring that meshes with the transmission gear ring. The return spring abuts against the transmission gear and the clutch cone. A sliding cone is provided on the rear side of the clutch cone. The stop bolt is threaded onto the boring bar, and its front end slides against the side wall of the sliding cone.

[0010] Preferably, the adjusting screw has several axial grooves, and the inner wall of the clutch cone has several transmission blocks, which are slidably installed in the axial grooves.

[0011] Preferably, the adjusting screw includes an integrally formed connecting part, a clutch part, and a threaded part. The connecting part is rotatably inserted into the boring bar and extends into the mounting groove. A scale is provided at the outer end of the connecting part. An internal hexagonal hole is provided on the scale. A plurality of axial grooves are circumferentially distributed on the outer wall of the clutch part. A driving block is provided on the lower side of the tool holder. The driving block is threadedly sleeved on the threaded part.

[0012] Preferably, the front end of the stop bolt is provided with a cone head, and the cone head slides and abuts against the cone surface of the sliding cone.

[0013] Preferably, the top of the boring bar is provided with a guide screw, the top of the boring bar is provided with a positioning screw hole, the tool head seat is provided with a guide groove hole, the guide screw passes through the guide groove hole and is threaded into the positioning screw hole, and the sliding of the guide screw abuts against the outside of the guide groove hole.

[0014] (III) Beneficial Effects

[0015] This utility model provides an adjustable boring bar assembly structure. It has the following advantages:

[0016] 1. In this utility model, after the cutter head seat is installed, the stop bolt is removed, and the clutch cone separates from the transmission gear under the action of the return spring, thereby separating the adjusting screw from the transmission gear. At this time, rotating the adjusting screw on one side will not affect the adjusting screw on the other side, thus realizing the independent adjustment of the cutter head seat, which can be adapted to compensate for the inherent errors of the cutting tool and the machine tool.

[0017] 2. In this utility model, the installation of the stop bolt can cause the cone head to press against the sliding cone of the clutch cone, causing the clutch cone to slide towards the transmission gear, so that the transmission gear ring and the meshing gear ring mesh with each other, thereby locking the adjusting screw and the transmission gear ring, realizing the synchronous transmission of the two adjusting screws, and thus achieving the purpose of synchronous adjustment of the two cutter head seats. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of an adjustable boring bar assembly structure according to the present invention;

[0019] Figure 2 This is an exploded view of an adjustable boring bar assembly structure according to this utility model;

[0020] Figure 3 This is a schematic diagram of the clutch mechanism in this utility model.

[0021] In the diagram: 1. Boring tool holder; 2. Tool head holder; 3. Guide screw; 4. Mounting slot; 5. Adjusting screw; 51. Connecting part; 52. Clutch part; 53. Threaded part; 6. Axial groove; 7. Dial; 8. Drive block; 9. Transmission gear; 10. Transmission gear ring; 11. Clutch cone; 111. Engaging gear ring; 112. Sliding cone; 12. Return spring; 13. Stop bolt; 14. Positioning ring; 15. Transmission block; 16. Cone head. Detailed Implementation

[0022] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0023] This utility model embodiment provides an adjustable boring bar assembly structure, such as... Figure 1-2 As shown, it includes a boring bar 1 and two tool holders 2 mounted on the top of the boring bar 1. The top of the boring bar 1 is provided with a guide screw 3 and a positioning screw hole. The tool holder 2 is provided with a guide groove hole. The guide screw 3 passes through the guide groove hole and is threaded into the positioning screw hole. The sliding of the guide screw 3 abuts against the outside of the guide groove hole. The boring bar 1 and the tool holder 2 are provided with guide teeth that slide and cooperate with each other.

[0024] like Figure 2-3 As shown, the top of the boring bar 1 has a mounting groove 4, and two parallel adjusting screws 5 are rotatably installed in the mounting groove 4. The adjusting screw 5 includes an integrally formed connecting part 51, a clutch part 52, and a threaded part 53. The connecting part 51 is rotatably inserted into the boring bar 1 and extends into the mounting groove 4. The outer wall of the clutch part 52 is circumferentially distributed with several axial grooves 6. The outer end of the connecting part 51 is provided with a scale 7, and the scale 7 has an internal hexagonal hole. The lower side of the tool head seat 2 is provided with a driving block 8, which is threadedly sleeved on the threaded part 53. By rotating the adjusting screw 5 through the internal hexagonal hole, the tool head seat 2 can be pushed to slide along the extension direction of the guide teeth on the top of the boring bar 1, thereby adjusting the boring radius.

[0025] A clutch mechanism is connected between the two adjusting screws 5. The clutch mechanism includes a transmission gear 9, a transmission gear ring 10, a clutch cone 11, a return spring 12, and a stop bolt 13. Two positioning rings 14 are provided on the outer wall of the clutch part 52. The transmission gear 9 is rotatably connected to the outer wall of the clutch part 52. The two positioning rings 14 slide against the front and rear sides of the transmission gear 9, so that the transmission gear 9 can only rotate on the adjusting screw 5 and cannot slide left or right. The two transmission gears 9 mesh with each other. The transmission gear ring 10 is integrally formed on the side of the transmission gear 9 facing the clutch cone 11. Several transmission blocks 15 are provided on the inner wall of the clutch cone 11. The transmission blocks 15 are slidably installed in the axial groove 6. The clutch cone 11 is slidably sleeved on the outer wall of the clutch part 52. The return spring 12 abuts against the transmission gear 9 and the clutch cone 11. The clutch cone 11 includes a meshing toothed ring 111 at the front end and a sliding cone 112 at the rear end. The meshing toothed ring 111 meshes with the transmission toothed ring 10. Under the supporting force of the return spring 12, the transmission gear 9 can be separated from the clutch cone, and the meshing toothed ring 111 can be disengaged from the transmission toothed ring 10. The mounting groove 4 has a stop screw hole at the position corresponding to the sliding cone 112. The stop bolt 13 is threaded through the stop screw hole. The front end of the stop bolt 13 is provided with a cone head 16. The cone head 16 slides against the cone surface of the sliding cone 112.

[0026] Working principle:

[0027] In this invention, when the two tool holders 2 need to be adjusted individually to compensate for the inherent errors of the cutting tool and the machine tool, the stop bolt 13 is first unscrewed. At this time, the pressure of the cone head 16 of the stop bolt 13 on the clutch cone 11 is eliminated. The clutch cone 11 will slide away from the transmission gear 9 under the support of the return spring 12. It will slide until the meshing gear ring 111 separates from the transmission gear ring 10. At this time, the adjusting screw 5 is rotated, and the tool holder 2 is pushed to slide horizontally on the top of the boring bar 1 through the threaded engagement. At this time, the transmission gear 9 will rotate relative to the adjusting screw 5. That is, rotating the adjusting screw 5 on one side will not affect the adjusting screw 5 on the other side, so as to realize the individual adjustment of the tool holder 2 and make the two tool holders 2 misaligned to compensate for the inherent errors of the cutting tool and the machine tool.

[0028] After adjusting the relative positions of the two tool holders 2, install the stop bolt 13. The cone head 15 of the stop bolt 13 will slide and abut against the cone surface of the sliding cone 112. Through the inclined sliding, the sliding cone 112 is pushed towards the transmission gear 9 until the meshing gear ring 111 and the transmission gear ring 10 mesh with each other, so that the transmission gear 9 is connected to the adjusting screw 5 and rotates together. Then, when the adjusting screw 5 on one side is rotated, the adjusting screw 5 on the other side will rotate synchronously through the gear 9. In this way, the two tool holders 2 can slide synchronously in opposite directions, so that when adjusting the inner diameter of the boring hole, it is not necessary to compensate for the inherent errors of the tool and the machine tool again, which improves the tool setting efficiency and can better ensure the dimensional adjustment accuracy.

[0029] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An adjustable boring bar assembly structure, comprising a boring bar and two tool holders mounted on the top of the boring bar, characterized in that: The top of the boring bar has a mounting groove, in which two parallel adjusting screws are rotatably mounted. A clutch mechanism is connected between the two adjusting screws. The clutch mechanism includes a transmission gear, a transmission gear ring, a clutch cone, a return spring, and a stop bolt. The transmission gear is rotatably connected to the adjusting screw, and the two transmission gears mesh with each other. The transmission gear ring is integrally formed on the side of the transmission gear facing the clutch cone. The clutch cone is slidably sleeved on the adjusting screw. The front end of the clutch cone has a meshing gear ring that meshes with the transmission gear ring. The return spring abuts between the transmission gear and the clutch cone. A sliding cone is provided on the rear side of the clutch cone. The stop bolt is threaded to the boring bar, and its front end slides against the side wall of the sliding cone.

2. The adjustable boring bar assembly structure according to claim 1, characterized in that: The adjusting screw has several axial grooves, and the inner wall of the clutch cone has several transmission blocks, which are slidably installed in the axial grooves.

3. The adjustable boring bar assembly structure according to claim 2, characterized in that: The adjusting screw includes an integrally formed connecting part, a clutch part, and a threaded part. The connecting part is rotatably inserted into the boring bar and extends into the mounting groove. A scale is provided at the outer end of the connecting part. The scale has an internal hexagonal hole. Several axial grooves are circumferentially distributed on the outer wall of the clutch part. A driving block is provided on the lower side of the tool holder. The driving block is threadedly sleeved on the threaded part.

4. The adjustable boring bar assembly structure according to claim 1, characterized in that: The front end of the stop bolt is provided with a cone head, which slides and abuts against the cone surface of the sliding cone.

5. The adjustable boring bar assembly structure according to claim 4, characterized in that: The top of the boring bar is provided with a guide screw and a positioning screw hole. The tool head seat is provided with a guide groove hole. The guide screw passes through the guide groove hole and is threaded into the positioning screw hole. The sliding of the guide screw abuts against the outside of the guide groove hole.

Images