Special-shaped hole turning tool holder
By using a turning tool holder for irregular holes on lathes, stable machining of irregular holes can be achieved, solving the problems of low efficiency and unstable accuracy in existing technologies, improving machining quality and efficiency, and reducing costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SICHUAN BAIJIANG PRECISION TOOLS CO LTD
- Filing Date
- 2025-08-07
- Publication Date
- 2026-07-07
AI Technical Summary
Existing technologies cannot directly process irregular holes on machining tools, resulting in low production efficiency, unstable precision, and increased costs and time due to reliance on specialized equipment.
A tool holder for turning irregular holes was designed. It uses the machine tool chuck as the kinetic energy input source. Through the transmission of components such as the lever body and the trajectory ring, the rotary motion is converted into a preset irregular trajectory motion. Combined with the locking outer ring type angular contact ball bearing and the synchronous support sleeve, the axial movement of the trajectory ring is controlled to achieve stable and reliable machining.
It improves processing accuracy and efficiency, reduces vibration interference, lowers processing errors, enables one-time forming of irregular holes, simplifies the production process, and reduces costs.
Smart Images
Figure CN224463726U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of turning tool holder technology, and in particular to turning tool holder for irregular holes. Background Technology
[0002] With rapid economic development and continuous improvement of social industrialization, the processing of irregular holes is increasingly used in many production fields such as machinery manufacturing, auto parts, and aerospace, and the demand for irregular structures such as square holes and hexagonal holes continues to grow.
[0003] However, current irregular hole processing technology still faces many practical difficulties, which restrict the improvement of production efficiency and processing quality;
[0004] In the existing production model, while machining tools are widely used basic processing equipment, they cannot directly perform machining operations on irregularly shaped holes. This technological limitation forces companies to rely on specialized machine tools when machining irregularly shaped holes such as square and hexagonal holes. For example, machining blind holes requires an electrical discharge machining (EDM) machine, rotary punching tool holders are suitable for some scenarios, while machining through holes sometimes requires the use of wire cutting machines. This reliance on specialized equipment not only increases the company's equipment investment costs but also limits production flexibility.
[0005] More significantly, existing rotary punching methods have limitations in their applicability for certain large-sized square holes and irregularly shaped holes, making effective machining impossible. Furthermore, in CNC machining, structural limitations at the root of some square holes make it difficult to achieve ideal corner clearing, resulting in machining accuracy failing to meet high standards. Simultaneously, because the machining of irregularly shaped holes cannot be performed concurrently with other processes on lathes, companies are forced to adopt a sequential machining model. This sequential machining not only prolongs the production cycle time, increasing production time and labor costs, but also easily introduces cumulative errors due to multiple clamping and process changes, leading to unstable machining accuracy and directly affecting the consistency and reliability of product quality.
[0006] Therefore, this utility model provides a tool holder for turning irregular holes. Utility Model Content
[0007] The purpose of this invention is to provide a tool holder for turning irregular holes, which solves the above-mentioned problems when used in operation.
[0008] To solve the above-mentioned technical problems, this utility model provides the following technical solution: a tool holder for turning irregular holes, including a tool holder, a dial, a lever body, and a boring tool assembly. The dial is provided at the front end of the tool holder, and a lever seat is installed at the front end of the top of the dial. The lever body is installed inside the lever seat. A synchronous support sleeve is provided inside the tool holder. A front track ring is installed at the front end of the synchronous support sleeve. The front end of the front track ring is connected to the dial. A rear track ring is provided at the rear end of the synchronous support sleeve. Hexagonal tracks are provided on the inner walls of the front track ring and the front track ring. A bearing bracket is provided inside the front track ring. A mandrel body is provided inside the bearing bracket. The front end of the mandrel body protrudes from the front of the tool holder and a boring tool assembly is installed thereon.
[0009] Preferably, the inner walls of the front track ring and the rear track ring are each provided with three hexagonal tracks, and the hexagonal tracks are distributed at equal intervals on the inner walls of the front track ring and the rear track ring.
[0010] Preferably, the two adjacent hexagonal tracks are rotated 30° symmetrically.
[0011] Preferably, the outer wall of the bearing bracket has three equally spaced mounting slots, the projection angle between two adjacent mounting slots is 120°, and a deep groove ball bearing is installed inside the mounting slot.
[0012] Preferably, the deep groove ball bearing is located on the inner wall of the hexagonal track and contacts the inner wall of the hexagonal track.
[0013] Preferably, a mandrel spacer is provided on the outside of the mandrel body, and the two ends of the mandrel spacer are connected to the bearing bracket.
[0014] Preferably, the front track ring and the rear track ring are equipped with locking outer ring type angular contact ball bearings, and the outer wall of the locking outer ring type angular contact ball bearings is fixedly connected to the inner wall of the tool holder.
[0015] Preferably, the rear end of the mandrel body is provided with an active slider, the outside of the active slider is provided with a wear-resistant plate and a gasket assembly, the end of the active slider is provided with a cross slider, the end of the cross slider is provided with an end cap, and the end cap is installed on the rear end of the tool holder.
[0016] Compared with the prior art, the beneficial effects of this utility model are as follows:
[0017] The irregular hole turning tool holder provided by this utility model uses the machine tool chuck as the kinetic energy input source. Through the orderly transmission of components such as the lever body and the trajectory ring, the rotational motion is converted into a preset irregular trajectory motion, which ensures the controllability and periodicity of the tool motion, provides a stable and reliable motion basis for the forming and processing of irregular holes, and solves the problem of the difficulty in accurately controlling the irregular trajectory in traditional processing.
[0018] The tool holder features low vibration, light weight, and extremely low impact load. Its axial movement of the trajectory ring is controlled by the dimensional fit of the locking outer ring angular contact ball bearing, synchronous support sleeve, and mandrel spacer. Simultaneously, wear-resistant plates and shim assemblies absorb minute vibrations, effectively reducing vibration interference during machining. This not only reduces adverse effects on the machine tool and extends its service life but also minimizes machining errors caused by vibration, ensuring machining accuracy.
[0019] In terms of improving processing efficiency, the tool holder enables one-time boring of irregularly shaped holes, eliminating the need for multiple clamping and repeated processing, significantly shortening the processing cycle and greatly improving processing efficiency. Compared with the traditional step-by-step processing method, it avoids the accumulation of errors caused by multiple positioning, improving the consistency of processing quality of irregularly shaped holes;
[0020] At the process optimization level, this tool holder can centrally integrate multiple processes and operations on lathes. By concentrating processes such as machining irregular holes on the same tool holder, it reduces the number of workpiece transfer links between different equipment or processes, lowers auxiliary time and logistics costs in the production process, simplifies the production flow, and improves overall production efficiency. It is suitable for the needs of batch and large-scale machining of irregular holes. Attached Figure Description
[0021] Figure 1 This is an overall structural diagram of the present invention;
[0022] Figure 2 This is a partial structural cross-section of the present invention. Figure 1 ;
[0023] Figure 3 This is a partial structural cross-section of the present invention. Figure 2 ;
[0024] Figure 4 This is a partial structure in this utility model. Figure 1 ;
[0025] Figure 5 This is a partial structure in this utility model. Figure 2 ;
[0026] Figure 6 This is a structural diagram of the dial in this utility model;
[0027] Figure 7 This is a disassembled structural diagram of the track ring and deep groove ball bearing in this utility model;
[0028] Figure 8 This is a structural diagram of the trajectory loop in this utility model;
[0029] Figure 9 This is the deep groove ball bearing structure in this utility model. Figure 1 ;
[0030] Figure 10 This is the deep groove ball bearing structure in this utility model. Figure 2 ;
[0031] Figure 11 This is a structural diagram of the mandrel in this utility model;
[0032] Figure 12 This is a partial structural disassembly in this utility model. Figure 1 ;
[0033] Figure 13 This is a partial structural disassembly in this utility model. Figure 2 ;
[0034] Figure 14 This is a front view of the structural cross-section of this utility model.
[0035] In the diagram: 1. Tool holder; 2. Dial; 3. Lever holder; 4. Lever body; 5. Boring tool assembly; 6. Locking outer ring type angular contact ball bearing; 7. Synchronous support sleeve; 8. Front track ring; 81. Hexagonal track; 9. Mandrel spacer; 91. Mandrel body; 10. Bearing bracket; 101. Mounting groove; 102. Deep groove ball bearing; 11. Rear track ring; 12. End cap; 121. Wear-resistant plate and gasket assembly; 122. Cross slider; 123. Active slider. Detailed Implementation
[0036] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0037] To further understand the content of this utility model, a detailed description of this utility model will be provided in conjunction with the accompanying drawings.
[0038] Combination Figures 1 to 14As shown, the irregular hole turning tool holder of this utility model includes a tool holder 1, a dial 2, a lever body 4, and a boring tool assembly 5. The dial 2 is provided at the front end of the tool holder 1, and a lever seat 3 is installed at the front end of the top of the dial 2. The lever body 4 is installed inside the lever seat 3. A synchronous support sleeve 7 is provided inside the tool holder 1. A front track ring 8 is installed at the front end of the synchronous support sleeve 7. The front end of the front track ring 8 is connected to the dial 2. A rear track ring 11 is provided at the rear end of the synchronous support sleeve 7. A hexagonal track 81 is provided on the front track ring 8 and its inner wall. A bearing bracket 10 is provided inside the front track ring 8. A mandrel body 91 is provided inside the bearing bracket 10. The front end of the mandrel body 91 protrudes from the front of the tool holder 1 and the boring tool assembly 5 is installed thereon.
[0039] The inner walls of the front track ring 8 and the rear track ring 11 are each provided with three hexagonal tracks 81, which are distributed at equal intervals on the inner walls of the front track ring 8 and the rear track ring 11.
[0040] The two adjacent hexagonal orbitals 81 are symmetrically rotated 30°.
[0041] The outer side wall of the bearing bracket 10 is provided with three equally spaced mounting slots 101, and the projection angle between two adjacent mounting slots 101 is 120°. A deep groove ball bearing 102 is installed inside the mounting slot 101.
[0042] The deep groove ball bearing 102 is located on the inner wall of the hexagonal track 81 and is in contact with the inner wall of the hexagonal track 81.
[0043] The outer side of the spindle body 91 is provided with a spindle spacer 9, and the two ends of the spindle spacer 9 are connected to the bearing bracket 10.
[0044] The front track ring 8 and the rear track ring 11 are equipped with locking outer ring type angular contact ball bearings 6, and the outer wall of the locking outer ring type angular contact ball bearings 6 is fixedly connected to the inner wall of the tool holder 1.
[0045] The rear end of the spindle body 91 is provided with an active slider 123. The active slider 123 is provided with a wear-resistant plate and a pad assembly 121. The end of the active slider 123 is provided with a cross slider 122. The end of the cross slider 122 is provided with an end cap 12. The end cap 12 is installed at the rear end of the tool holder 1.
[0046] Working principle:
[0047] During installation, the tool holder 1 is fixed to the corresponding position on the lathe, and the lever body 4 is connected to the three-jaw chuck of the machine tool's drive unit. When the machine tool starts, the three-jaw chuck rotates at a preset speed, transmitting kinetic energy to the lever body 4. The lever body 4 then drives the front track ring 8 to rotate synchronously. Since the front track ring 8 and the rear track ring 11 are connected by a synchronous support sleeve 7, the rotational motion of the front track ring 8 can be directly transmitted to the rear track ring 11, achieving synchronous rotation of the two track rings. During this process, the axial movement of the two track rings is effectively controlled by the dimensional fit between the locking outer ring type angular contact ball bearing 6, the synchronous support sleeve 7, and the spindle spacer 9, ensuring transmission stability.
[0048] Three deep groove ball bearings 102 are installed on the bearing supports 10 at both ends of the spindle body 91. These bearings cooperate with the hexagonal tracks 81 machined on the inner walls of the front track ring 8 and the rear track ring 11. When the lever body 4 drives the two track rings to rotate synchronously, the deep groove ball bearings 102 roll along the hexagonal tracks 81, and the guide effect of the track contour causes the spindle body 91 to produce a specific irregular trajectory movement.
[0049] The end of the spindle body 91 is connected to the active slider 123 through a positioning pin. The active slider 123 cooperates with the cross slider 122. The wear-resistant plate and gasket assembly 121 installed on the disc structure of the active slider 123 can effectively absorb the slight vibration during the transmission process, further ensuring the smoothness of the movement of the spindle body 91.
[0050] To prevent the core components from loosening and affecting the machining accuracy, the device uses end cap 12 to lock and fix the wear-resistant plate and the wear-resistant plate of the gasket assembly 121 by screw installation, so as to avoid loosening during high-speed movement, which would lead to increased gap or vibration.
[0051] Finally, when the lever body 4 drives the front track ring 8 and the rear track ring 11 to rotate, the deep groove ball bearings 102 on the bearing supports 10 at both ends of the spindle body 91 rotate along the hexagonal track 81 on the inner sidewall of the front track ring 8 and the rear track ring 11, thereby outputting a specific irregular trajectory. The spindle body 91 moves along its irregular trajectory to drive the boring tool assembly 5 to move, thus realizing the cutting of the special trajectory.
[0052] This transmission structure inputs kinetic energy through the machine tool chuck, and through the orderly transmission of components such as the lever and trajectory loop, efficiently converts rotary motion into preset trajectory motion. It features low vibration, light weight, and extremely low impact load, minimizing adverse effects on the machine tool. Simultaneously, the device can centralize multi-process machining operations on lathes, reducing workpiece transfer steps and significantly improving machining efficiency.
[0053] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.
[0054] 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. A tool holder for turning irregular holes, comprising a tool holder (1), a dial (2), a lever body (4), and a boring tool assembly (5), characterized in that: The tool holder (1) is provided with a dial (2) at its front end. A lever seat (3) is installed at the front end of the top of the dial (2). A lever body (4) is installed inside the lever seat (3). A synchronous support sleeve (7) is provided inside the tool holder (1). A front track ring (8) is installed at the front end of the synchronous support sleeve (7). The front end of the front track ring (8) is connected to the dial (2). A rear track ring (11) is provided at the rear end of the synchronous support sleeve (7). A hexagonal track (81) is provided on the inner wall of the front track ring (8). A bearing bracket (10) is provided inside the front track ring (8). A mandrel body (91) is provided inside the bearing bracket (10). A boring tool assembly (5) is installed on the front end of the mandrel body (91) protruding from the front of the tool holder (1).
2. The irregular hole turning tool holder according to claim 1, characterized in that: The inner walls of the front track ring (8) and the rear track ring (11) are each provided with three hexagonal tracks (81), and the hexagonal tracks (81) are distributed at equal intervals on the inner walls of the front track ring (8) and the rear track ring (11).
3. The irregular hole turning tool holder according to claim 2, characterized in that: The two adjacent hexagonal orbitals (81) are rotated 30° symmetrically.
4. The irregular hole turning tool holder according to claim 1, characterized in that: The outer wall of the bearing bracket (10) is provided with three mounting slots (101) at equal intervals. The projection angle between two adjacent mounting slots (101) is 120°. A deep groove ball bearing (102) is provided inside the mounting slot (101).
5. The irregular hole turning tool holder according to claim 4, characterized in that: The deep groove ball bearing (102) is located on the inner wall of the hexagonal track (81) and is in contact with the inner wall of the hexagonal track (81).
6. The irregular hole turning tool holder according to claim 1, characterized in that: The mandrel body (91) is provided with a mandrel spacer (9) on its outside, and the two ends of the mandrel spacer (9) are connected to the bearing bracket (10).
7. The irregular hole turning tool holder according to claim 1, characterized in that: The front track ring (8) and the rear track ring (11) are equipped with lock-type outer ring angular contact ball bearings (6), and the outer wall of the lock-type outer ring angular contact ball bearings (6) is fixedly connected to the inner wall of the tool holder (1).
8. The irregular hole turning tool holder according to claim 1, characterized in that: The rear end of the spindle body (91) is provided with an active slider (123), the outside of the active slider (123) is provided with a wear-resistant plate and a pad assembly (121), the end of the active slider (123) is provided with a cross slider (122), the end of the cross slider (122) is provided with an end cap (12), and the end cap (12) is installed at the rear end of the tool holder (1).