A tool holder tooling and tooling adjustment method for ring face worm gear cutting

Abstract

The application relates to the technical field of machining, and discloses a tool rest tooling for ring face worm gear cutting machining, which comprises a tool rest base connected with a machine tool turret, a tool bar mounting shaft rotatably mounted on the tool rest base, the tool bar mounting shaft being provided with a mounting portion for mounting a tool, the tool bar mounting shaft being rotatable about its own axis relative to the tool rest base to adjust the mounting angle of the tool mounted thereon, and the tool rest tooling further comprising a first locking mechanism and a second locking mechanism, the first locking mechanism being used for limiting the axial movement of the tool bar mounting shaft relative to the tool rest base. Through the structural design that the tool bar mounting shaft is rotatable relative to the tool rest base, flexible adjustment of the mounting angle of the tool is realized, the tool cutting machining requirement of different helix angle worms can be met without disassembling and replacing the whole tooling, the efficiency of machining type switching is greatly improved, and the labor intensity is reduced.

Description

Technical Field

[0001] This invention relates to the field of machining technology, and more specifically, to a tool holder fixture and tooling adjustment method for machining toroidal worm gears, particularly suitable for machining worm gears with various helical angles on CNC lathes. Background Technology

[0002] In the field of machining technology, the cutting of toroidal worm gears is a key process in the manufacturing of core components of speed reducers. With the rapid development of the construction machinery industry, speed reducer models are becoming increasingly diversified. Different models of worm gears correspond to different helix angles, which places different requirements on the installation angle of the cutting tools.

[0003] Traditional processes use fixed tool holders that can only hold one type of tool with a fixed angle for machining toroidal worm gears at a time. When machining worm gears with different helix angles, operators must remove the entire tooling from the machine tool, replace it with another tooling of the corresponding angle, and then re-set and adjust the tool. Since there are many models of reducers for construction machinery, and the worm gears involved have several helix angles, each time the model is switched, it leads to frequent tooling changes by employees. Manual tooling changes are labor-intensive, and automated production has long downtime, which seriously affects production efficiency and equipment utilization.

[0004] In addition, different models of tooling need to be purchased and managed in inventory separately, which not only increases the cost of tooling purchases, but also occupies storage space, bringing additional burdens to the company's production management.

[0005] Therefore, there is an urgent need for a universal tool holder fixture that can adapt to the machining needs of worm gears with various helical angles and does not require frequent tool changes. Summary of the Invention

[0006] To address the technical problems existing in the background art, the present invention provides a tool holder fixture and a tool holder adjustment method for machining toroidal worm gears. Through the relative rotation adjustment function between the tool holder mounting shaft and the tool holder seat, combined with a scale indication system, it can achieve rapid and precise adjustment of the tool angle to meet the machining requirements of worm gears with different helix angles.

[0007] To achieve the above objectives, the present invention proposes a tool holder fixture for machining toroidal worm gears, comprising: Tool holder, used to connect to the machine tool turret; A tool holder mounting shaft is rotatably mounted on the tool holder seat, and the tool holder mounting shaft has a mounting portion for mounting a tool; The tool holder mounting shaft can rotate relative to the tool holder seat about its own axis to adjust the mounting angle of the tool mounted thereon. The tool holder fixture further includes a first locking mechanism and a second locking mechanism. The first locking mechanism is used to limit the axial movement of the tool holder mounting shaft relative to the tool holder seat, and the second locking mechanism is used to lock the tool holder mounting shaft in the adjusted rotational position.

[0008] As a further optimized solution of the present invention, the tool holder mounting shaft includes a cylindrical section and a limiting part connected in sequence. The cylindrical section is inserted into the tool holder seat and rotates with the tool holder seat. The radial dimension of the limiting part is larger than the radial dimension of the cylindrical section, which is used to limit the axial insertion depth of the tool holder mounting shaft. The tool holder mounting shaft also includes a prism segment, which is connected to the end of the limiting portion away from the cylindrical segment. The prism segment is a regular polygonal prism and is used to drive the tool to rotate the tool holder mounting shaft.

[0009] As a further optimization of the present invention, an axially penetrating mounting hole is provided on the tool holder mounting shaft. The mounting hole is coaxially arranged with the tool holder mounting shaft, and the shape of the mounting hole is adapted to the cross-sectional shape of the tool holder for inserting and installing the tool holder. The mounting hole is a square hole, which is compatible with the square cross-section tool holder; the opening of the square hole is chamfered around the perimeter to facilitate the centering and insertion of the tool holder.

[0010] As a further optimization of the present invention, the first locking mechanism includes a positioning hole opened on the tool holder seat and a first fastener passing through the positioning hole. A radially penetrating through hole is opened on the cylindrical section of the tool holder mounting shaft. The through hole is correspondingly arranged with the assembly hole on the tool holder. The first fastener passes through the positioning hole, the through hole and the assembly hole in sequence to restrict the axial movement of the tool holder mounting shaft. The positioning hole is a threaded hole, and the first fastener is a clamping screw. The diameter of the positioning hole is smaller than the diameter of the through hole, so that the cylindrical segment still has circumferential rotational allowance after the first fastener is inserted.

[0011] As a further optimization of the present invention, the second locking mechanism includes a limiting hole opened on the tool holder seat and a second fastener passing through the limiting hole. The inner end of the second fastener abuts against the outer peripheral surface of the tool holder mounting shaft, and is used to lock the tool holder mounting shaft in the adjusted rotation position. The limiting hole is a threaded hole, and the second fastener is a set screw. The screw end of the set screw abuts against the outer circular surface of the cylindrical section, and the adjusted rotational position is locked and fixed by friction.

[0012] As a further optimization of the present invention, the tool holder mounting shaft is provided with an indicator mark, and the tool post seat is provided with an angle scale line. The indicator mark and the angle scale line are used in conjunction to indicate the current rotation angle of the tool holder mounting shaft. The indicator mark is disposed on the front end face of the limiting part, and the angle scale line is disposed on the front end face of the tool holder. The angle scale line includes a centrally located reference scale line and multiple gear scale lines distributed circumferentially. Each gear scale line represents a corresponding rotation angle value. The number of gear scale lines is four, representing rotation angles of 4.7°, 5.1°, 5.4° and 5.8° respectively, which are used to realize the rapid switching of the four conventional angles of the cutting tool.

[0013] As a further optimization of the present invention, the indicator mark is arranged parallel to the axis of the through hole, and when the through hole is aligned with the positioning hole, the indicator mark is in the center position and aligned with the reference scale line. The indicator mark is an indicator scale line, and its extension direction is parallel to the axial direction of the through hole. When the tool holder mounting shaft is in the initial position, the indicator scale line is aligned with the reference scale line, and the rotation angle is 0°.

[0014] As a further optimization of the present invention, the tool holder has a connecting part, which is used for docking and installation with the tool turret of a CNC lathe; The tool holder is fixedly connected to the tool turret via the connecting part, and the structure of the connecting part is adapted to the interface structure of the tool turret.

[0015] As a further optimization of the present invention, the limiting part is a circular boss, and the rear end face of the circular boss is in contact with the front end face of the tool holder. The annular boss is integrally formed between the cylindrical segment and the prism segment, and the diameter of the annular boss is larger than the diameter of the cylindrical segment and the circumcircle diameter of the prism segment.

[0016] This invention also proposes a method for adjusting a tool holder fixture for machining toroidal worm gears. The adjustment using the aforementioned tool holder fixture includes the following steps: S1: Insert the tool holder into the mounting hole of the tool holder mounting shaft, and use the first locking mechanism to axially limit the tool holder mounting shaft, and use the second locking mechanism to rotate and lock the tool holder mounting shaft; S2: Loosen the second locking mechanism to release the rotational locking of the tool holder mounting shaft; S3: Rotate the tool holder mounting shaft to align the indicator mark with the scale line corresponding to the target angle in the angle scale; S4: Tighten the second locking mechanism again to fix the tool holder mounting shaft in the adjusted rotation position.

[0017] As a further optimization of the present invention, in step S3, the tool drives the prism segment to rotate the tool holder mounting shaft, and observes the relative position of the indicator mark and the angle scale line until the indicator mark is aligned with the target angle gear scale line.

[0018] Compared with the prior art, the above-mentioned tool holder fixture and tooling adjustment method for machining toroidal worm gears have the following advantages: 1. This invention achieves flexible adjustment of the tool mounting angle through a structural design that allows the tool holder mounting shaft to rotate relative to the tool holder seat. It can adapt to the gear cutting needs of worm gears with different helical angles without disassembling and replacing the entire set of tooling, greatly improving the efficiency of processing and switching models and reducing the intensity of manual labor.

[0019] 2. By using the combination of indicator marks and angle scale lines, the operator can directly observe and accurately locate the target angle without the need for additional measuring tools. The accurate positioning ensures the stability of the processing quality.

[0020] 3. The present invention employs a dual locking design, which achieves axial limiting through a first locking mechanism and rotational locking through a second locking mechanism. This design ensures smooth rotation of the tool holder mounting shaft during adjustment and maintains stable tool angle after adjustment, thereby improving machining safety.

[0021] 4. The present invention can replace multiple sets of traditional tooling at different angles with one set of tooling, saving the cost of purchasing different models of tooling, reducing the burden of tooling inventory management, and having good economic benefits.

[0022] 5. The present invention has a simple structure and is easy to operate. Ordinary operators can master the adjustment method after simple training, without the need for professional personnel, which further improves production efficiency.

[0023] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0024] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a three-dimensional structural diagram of the tool holder mounting shaft of the present invention; Figure 3 This is a three-dimensional structural diagram of the tool holder of the present invention; Figure 4 For the present invention Figure 1Enlarged structural diagram at point A; Figure 5 This is a schematic diagram of the axial cross-sectional structure of the present invention; Figure 6 This is a schematic diagram of the radial cross-sectional structure of the present invention.

[0025] Figure descriptions: 1. Tool holder; 2. Tool holder mounting shaft; 21. Cylindrical section; 22. Circular boss; 23. Prismatic section; 24. Mounting hole; 25. Through hole; 3. Connecting part; 4. Positioning hole; 5. Sleeve hole; 6. Indicator scale line; 7. Reference scale line; 8. Gear scale line; 9. Limiting hole. Detailed Implementation

[0026] Embodiments of the present invention are described in detail below. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar symbols denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0027] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0028] Please see Figures 1 to 6 The tool holder fixture for machining toroidal worm gears proposed in this invention mainly includes a tool holder seat 1 and a tool holder mounting shaft 2. The tool holder seat 1 is used to connect with the tool turret of a CNC lathe, and the tool holder mounting shaft 2 is rotatably mounted on the tool holder seat 1 to install the tool and adjust the tool angle.

[0029] The axial side of the tool holder 1 has a connecting part 3. The structure of the connecting part 3 is adapted to the interface structure of the CNC lathe tool turret and is used to fix the entire tool holder fixture on the tool turret. The front end face of the tool holder 1 is provided with a sleeve hole 5. The sleeve hole 5 extends along the axial direction of the tool holder 1 and is used for the tool holder mounting shaft 2 to be inserted and rotated with it.

[0030] The outer wall of the tool holder 1 is provided with a positioning hole 4 that communicates with the sleeve hole 5. The positioning hole 4 is a threaded hole used to install the clamping screw of the first locking mechanism. The outer wall of the tool holder 1 is also provided with a limiting hole 9 that communicates with the sleeve hole 5. The limiting hole 9 is also a threaded hole used to install the set screw of the second locking mechanism.

[0031] The front end face of the tool holder 1 is provided with angle scale lines, including a centrally located reference scale line 7 and multiple gear scale lines 8 arranged circumferentially in a clockwise or counterclockwise direction. In this embodiment, there are four gear scale lines 8, which represent rotation angle values ​​of 4.7°, 5.1°, 5.4° and 5.8° respectively. Of course, in other embodiments, the number of gear scale lines 8 and the corresponding angle values ​​can be adjusted according to actual working conditions.

[0032] The tool holder mounting shaft 2 includes a cylindrical section 21, an annular boss 22 serving as a limiting part, and a prism section 23 connected in sequence. The three are integrally formed. The diameter of the cylindrical section 21 is the same as the circumcircle diameter of the prism section 23, and both are smaller than the diameter of the annular boss 22. The cylindrical section 21 is inserted into the sleeve hole 5 of the tool holder seat 1 and rotates with the sleeve hole 5. The annular boss 22 is located outside the sleeve hole 5, and its rear end face is in contact with the front end face of the tool holder seat 1 to limit the axial insertion depth of the tool holder mounting shaft 2. The prism section 23 is located in front of the annular boss 22 and is a regular hexagonal prism, which makes it convenient for the operator to drive the tool holder mounting shaft 2 to rotate using a wrench or other tools.

[0033] The tool holder mounting shaft 2 has an axially penetrating mounting hole 24 for a cylindrical section 21, an annular boss 22, and a prism section 23. The mounting hole 24 is a square hole and is coaxially aligned with the tool holder mounting shaft 2. Its shape is adapted to the square cross-sectional dimensions of the tool holder. The opening of the mounting hole 24 has a chamfer at the connection between the opening and the prism section 23 to facilitate the centering and insertion of the tool holder.

[0034] The outer circular surface of the cylindrical segment 21 is provided with a radially penetrating through hole 25. There are two through holes 25, which are distributed at intervals along the axial direction of the cylindrical segment 21. When the square cross-section end of the tool holder is fully inserted into the mounting hole 24, the two assembly holes on the tool holder are respectively aligned with the two through holes 25, and the diameter of the assembly holes is the same as the diameter of the through holes 25.

[0035] The front end face of the annular boss 22 is provided with an indicator scale line 6 as an indicator mark. The indicator scale line 6 is parallel to the axis of the through hole 25, so that when the through hole 25 is aligned with the positioning hole 4, the indicator scale line 6 is in the center position of the front end face of the tool holder 1.

[0036] The first locking mechanism is used to restrict the axial movement of the tool holder mounting shaft 2 relative to the tool holder seat 1. It includes a positioning hole 4 opened on the tool holder seat 1 and a first fastener passing through the positioning hole 4. In this embodiment, the first fastener is preferably a clamping screw.

[0037] During installation, the square-section end of the tool bar is inserted into the mounting hole 24. The assembly hole on the tool bar is aligned with the through hole 25 on the cylindrical section 21. After the cylindrical section 21 is inserted into the sleeve hole 5, it cannot be inserted further because the diameter of the annular boss 22 is larger than the diameter of the sleeve hole 5. At this time, the cylindrical section 21 has been inserted into place. By rotating the prism section 23, the cylindrical section 21 is rotated so that the through hole 25 is aligned with the positioning hole 4. Then, the clamping screw is inserted from the positioning hole 4 and passes through the positioning hole 4, the through hole 25 and the assembly hole on the tool bar in sequence until it contacts the inner wall of the sleeve hole 5. The positioning hole 4 is a threaded hole, and the clamping screw is threaded to it to achieve axial limiting and anti-dislodgement of the cylindrical section 21.

[0038] Since the diameter of the positioning hole 4 is smaller than the diameter of the through hole 25 and the assembly hole, after the clamping screw is inserted, the cylindrical section 21 still has a certain circumferential rotation margin, which can perform a small angle rotation under the condition of axial anti-dislodgement, thereby fine-tuning the tool angle.

[0039] The second locking mechanism is used to lock the tool holder mounting shaft 2 in the adjusted rotational position. It includes a limiting hole 9 opened on the tool holder seat 1 and a second fastener passing through the limiting hole 9. In this embodiment, the second fastener is preferably a set screw.

[0040] After the angle adjustment is completed, insert the set screw into the limiting hole 9 and tighten it so that the screw end of the set screw contacts the outer circular surface of the cylindrical section 21. Use friction to radially lock the cylindrical section 21 after the angle is finely adjusted, so as to ensure that the tool angle remains stable during the machining process.

[0041] When the angle needs to be adjusted again, rotate the set screw in the opposite direction to separate the screw end from the outer surface of the cylindrical section 21, thereby releasing the locking state and allowing for a new angle adjustment.

[0042] The indicator scale line 6 on the front face of the annular boss 22 is used in conjunction with the reference scale line 7 and the gear scale line 8 on the front face of the tool holder 1. In the initial position, the through hole 25 is aligned with the positioning hole 4, and the indicator scale line 6 is aligned with the reference scale line 7. At this time, the rotation angle is 0°.

[0043] When the tool angle needs to be adjusted, first rotate the set screw in the opposite direction to release the lock on the cylindrical section 21. Then, use a wrench or other tools to drive the prism section 23 to rotate. The prism section 23 drives the annular boss 22 and the cylindrical section 21 to rotate synchronously. The operator observes the relative position of the indicator scale line 6 and the scale lines 8 of each position, and rotates the tool holder mounting shaft 2 until the indicator scale line 6 is aligned with the scale line 8 of the position corresponding to the target angle. After alignment, tighten the set screw to lock the cylindrical section 21 in the current rotation position, thus completing the angle adjustment.

[0044] In this embodiment, the four gear scale lines 8 correspond to four angles: 4.7°, 5.1°, 5.4°, and 5.8°. The operator can align the indicator scale line 6 with the corresponding gear scale line 8 according to the helix angle requirements of the worm gear to be processed, so as to achieve rapid and accurate switching of the tool angle.

[0045] The present invention also provides a method for adjusting a tool holder fixture for machining toroidal worm gears, comprising the following steps: Step S1: Tool Installation Insert the square-section end of the tool holder into the mounting hole 24 of the tool holder mounting shaft 2, ensuring that the assembly hole on the tool holder is aligned with the through hole 25 on the cylindrical section 21. Insert the clamping screw through the positioning hole 4, and pass it through the positioning hole 4, through the through hole 25 and the assembly hole in sequence to axially limit the tool holder mounting shaft 2 on the tool holder seat 1. Finally, rotate the set screw forward and screw it into the limiting hole 9 so that the screw end of the set screw contacts the outer circular surface of the cylindrical section 21, thereby radially clamping the tool holder mounting shaft 2 and fixing the rotation angle.

[0046] Step S2: Loosen the lock When fine-tuning of the tool angle is required, the set screw in the limiting hole 9 is rotated in the opposite direction to separate the screw end of the set screw from the outer surface of the cylindrical section 21, thereby releasing the rotation lock of the tool holder mounting shaft 2.

[0047] Step S3: Angle Adjustment Use a wrench or other tools to drive the prism segment 23 to rotate, which in turn drives the tool holder mounting shaft 2 to rotate. Observe the relative position of the indicator scale line 6 and the gear scale line 8 until the indicator scale line 6 is aligned with the gear scale line 8 corresponding to the target angle.

[0048] Step S4: Lock and secure Tighten the set screw in the limiting hole 9 so that the screw end abuts against the outer circular surface of the cylindrical section 21, and lock the tool holder mounting shaft 2 in the adjusted rotation position to complete the angle adjustment.

[0049] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A tool holder fixture for machining toroidal worm gear teeth, comprising: Tool holder, used to connect to the machine tool turret; A tool holder mounting shaft is rotatably mounted on the tool holder seat, and the tool holder mounting shaft has a mounting portion for mounting a tool; The tool holder mounting shaft is characterized in that it can rotate relative to the tool holder seat about its own axis to adjust the mounting angle of the tool mounted thereon; The tool holder fixture further includes a first locking mechanism and a second locking mechanism. The first locking mechanism is used to limit the axial movement of the tool holder mounting shaft relative to the tool holder seat, and the second locking mechanism is used to lock the tool holder mounting shaft in the adjusted rotational position.

2. The tool holder fixture for machining toroidal worm gears according to claim 1, characterized in that, The tool holder mounting shaft includes a cylindrical section and a limiting part connected in sequence. The cylindrical section is inserted into the tool holder seat and rotates with the tool holder seat. The radial dimension of the limiting part is larger than the radial dimension of the cylindrical section, which is used to limit the axial insertion depth of the tool holder mounting shaft.

3. The tool holder fixture for machining toroidal worm gears according to claim 2, characterized in that, The tool holder mounting shaft also includes a prism segment, which is connected to the end of the limiting portion away from the cylindrical segment. The prism segment is a regular polygonal prism and is used to drive the tool to rotate the tool holder mounting shaft.

4. The tool holder fixture for machining toroidal worm gears according to claim 1, characterized in that, The tool holder mounting shaft has an axially penetrating mounting hole, which is coaxially arranged with the tool holder mounting shaft. The shape of the mounting hole is adapted to the cross-sectional shape of the tool holder, and is used for inserting and installing the tool holder.

5. The tool holder fixture for machining toroidal worm gears according to claim 2, characterized in that, The first locking mechanism includes a positioning hole on the tool holder and a first fastener passing through the positioning hole. A radially penetrating through hole is provided on the cylindrical section of the tool holder mounting shaft. The through hole corresponds to the assembly hole on the tool holder. The first fastener passes through the positioning hole, the through hole and the assembly hole in sequence to restrict the axial movement of the tool holder mounting shaft.

6. The tool holder fixture for machining toroidal worm gears according to claim 5, characterized in that, The diameter of the positioning hole is smaller than the diameter of the through hole, so that the cylindrical segment still has circumferential rotational allowance after the first fastener is inserted.

7. The tool holder fixture for machining toroidal worm gears according to claim 2, characterized in that, The second locking mechanism includes a limiting hole opened on the tool holder seat and a second fastener passing through the limiting hole. The inner end of the second fastener abuts against the outer peripheral surface of the tool holder mounting shaft, and is used to lock the tool holder mounting shaft in the adjusted rotation position.

8. The tool holder fixture for machining toroidal worm gears according to claim 1, characterized in that, The tool holder mounting shaft is provided with an indicator mark, and the tool post seat is provided with an angle scale line. The indicator mark and the angle scale line are used together to indicate the current rotation angle of the tool holder mounting shaft.

9. The tool holder fixture for machining toroidal worm gears according to claim 8, characterized in that, The angle scale line includes a centrally located reference scale line and multiple gear scale lines distributed circumferentially, each gear scale line representing a corresponding rotation angle value.

10. A method for adjusting a tool holder fixture for machining toroidal worm gears, wherein the tool holder fixture as described in any one of claims 1 to 9 is used for adjustment, characterized in that... Includes the following steps: S1: Insert the tool holder into the mounting hole of the tool holder mounting shaft, and use the first locking mechanism to axially limit the tool holder mounting shaft, and use the second locking mechanism to rotate and lock the tool holder mounting shaft; S2: Loosen the second locking mechanism to release the rotational locking of the tool holder mounting shaft; S3: Rotate the tool holder mounting shaft to align the indicator mark with the scale line corresponding to the target angle in the angle scale; S4: Tighten the second locking mechanism again to fix the tool holder mounting shaft in the adjusted rotation position.

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