Thread grinding machine with a centering mechanism
By designing multi-point straightening and protection components on the thread grinding machine, the problems of workpiece displacement and chip splashing during the machining process were solved, achieving high-precision and high-efficiency internal thread machining, reducing costs and extending the service life of the machine tool.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- JIANGXI FENGCHENG PRECISION MASCH CO LTD
- Filing Date
- 2025-07-29
- Publication Date
- 2026-07-07
AI Technical Summary
Traditional thread grinding machines lack effective straightening mechanisms, which makes the workpiece prone to shifting or shaking during processing, affecting thread accuracy and consistency, resulting in low processing efficiency and high scrap rate.
A centering assembly was designed, comprising a left-hand rotary spindle, a right-hand rotary spindle, a central spindle, an HSK tool holder, a grinding wheel, a grinding rod, and a copper bushing. This assembly ensures the grinding wheel is fixed through multi-point stabilization and centering, while protective components prevent debris from splashing, ensuring a clean machining environment.
It improves the machining accuracy and efficiency of internal threads, reduces grinding costs, extends the service life of machine tools, and reduces the contamination of machine tools by debris.
Smart Images
Figure CN224463850U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of nut internal thread grinding technology, and in particular relates to a straightening mechanism for a thread grinding machine. Background Technology
[0002] In recent years, the field of artificial intelligence has developed rapidly, and breakthroughs in core technologies have directly accelerated the progress of humanoid robots. In order to make the joints of humanoid robots more flexible and compact, a nut and micro screw drive method is adopted. The internal thread processing of the nut is particularly important, especially the final grinding process.
[0003] Traditional thread grinding machines lack effective straightening mechanisms, which makes the workpiece prone to shifting or shaking during processing. Due to the unstable workpiece positioning, traditional grinding methods often fail to guarantee the accuracy and consistency of the threads, resulting in low processing efficiency and a high scrap rate. Utility Model Content
[0004] This utility model addresses the problem that traditional thread grinding machines in the prior art lack an effective centering mechanism, which leads to workpiece displacement or wobbling during processing. Due to unstable workpiece positioning, traditional grinding methods often fail to guarantee thread accuracy and consistency, resulting in low processing efficiency and a high scrap rate. The following technical solution is proposed:
[0005] A straightening mechanism for a thread grinding machine includes:
[0006] The machine body provides a stable mounting base for the parts being processed;
[0007] A dressing roller mechanism is installed on the machine body and is used to perform preliminary grinding operations on the workpiece.
[0008] The alignment assembly includes a left rotary spindle, a right rotary spindle, a central spindle, a left HSK tool holder, a right HSK tool holder, a grinding wheel, a grinding rod, and a copper sleeve. The left rotary spindle is located on the top of the machine body, the right rotary spindle is located on the top of the machine body, the central spindle is installed on the top of the machine body and clamped between the left and right rotary spindles, the left HSK tool holder is connected to the left rotary spindle, the right HSK tool holder is connected to the right rotary spindle, the grinding rod is clamped between the left and right HSK tool holders, the grinding wheel is sleeved on the outer surface of the grinding rod, and the copper sleeve is located inside the left HSK tool holder.
[0009] As a preferred embodiment of the above technical solution, a centrally located chuck is installed inside the centrally located spindle, and the centrally located chuck is used to fit onto the outer surface of the workpiece.
[0010] As a preferred embodiment of the above technical solution, the outer surface of the grinding rod is connected to a locking nut by a thread, and a clamping washer is sandwiched between the locking nut and the grinding wheel.
[0011] As a preferred embodiment of the above technical solution, a protection component is further included, the protection component comprising:
[0012] The upper and lower protective covers are symmetrically arranged in two sets to prevent debris from falling onto the processing parts on the machine body;
[0013] A bearing, connected to the lower protective cover, is used to reduce friction between the left and right HSK tool holders.
[0014] The support feet are connected to the central spindle and are used to support the upper and lower protective covers.
[0015] As a preferred embodiment of the above technical solution, a fixed shaft is fixedly installed inside the support foot, and a baffle is rotatably connected to the outer surface of the fixed shaft. The baffle is fan-shaped and is used to limit the upper and lower protective covers.
[0016] As a preferred embodiment of the above technical solution, an elastic limiting rod is slidably installed inside the support foot, and the elastic limiting rod is used to limit the rotation of the baffle.
[0017] The beneficial effects of this utility model are as follows:
[0018] (1) This utility model, through the setting of the straightening component, through the left rotating spindle, right rotating spindle, center spindle and other structures, realizes multi-point stable straightening of the grinding wheel, ensuring that the internal thread accuracy of the workpiece is consistent, greatly improving grinding efficiency, reducing the wear of the center grinding wheel and reducing processing cost;
[0019] (2) The present invention, through the protective components, can detachably install the upper protective cover and the lower protective cover on the left and right sides of the central spindle, ensuring that the workpiece is ground and that the debris falls onto the processing parts of the machine tool as little as possible. After the processing is completed, it is more convenient to clean and maintain the protective cover, which helps to keep the machine tool clean and extend its service life. Attached Figure Description
[0020] Figure 1 The diagram shown is a schematic diagram of the overall structure of a straightening mechanism for a thread grinding machine.
[0021] Figure 2 The diagram shown is a partial structural schematic of a straightening mechanism for a thread grinding machine.
[0022] Figure 3 The diagram shown is a partial structural cross-sectional view of the straightening component;
[0023] Figure 4 What is shown is Figure 3 Schematic diagram of the structure of region A in the middle;
[0024] Figure 5 The diagram shown is a structural schematic of the protective component;
[0025] Figure 6 What is shown is Figure 5 Schematic diagram of the structure of region B in the middle;
[0026] Figure 7 The diagram shows the structure of the grinding rod and the copper sleeve.
[0027] In the diagram: 1. Machine body; 2. Dressing roller mechanism; 3. Left rotating spindle; 4. Right rotating spindle; 5. Central spindle; 6. Left HSK tool holder; 7. Right HSK tool holder; 8. Grinding wheel; 9. Grinding rod; 10. Copper sleeve; 11. Central chuck; 12. Workpiece; 13. Pressure shim; 14. Locking nut; 15. Upper protective cover; 16. Lower protective cover; 17. Bearing; 18. Support foot; 19. Fixed shaft; 20. Baffle; 21. Elastic limit rod. Detailed Implementation
[0028] To make the objectives, technical solutions, and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments.
[0029] Example 1
[0030] This utility model provides a centering mechanism for a thread grinding machine, such as... Figures 1 to 7 As shown, the straightening mechanism for the thread grinding machine includes a machine body 1, a dressing roller mechanism 2, and a straightening assembly. The machine body 1 provides a stable mounting base for the parts being processed. The dressing roller mechanism 2 is mounted on the machine body 1 and is used for preliminary grinding of the workpiece 12. The straightening assembly includes a left rotary spindle 3, a right rotary spindle 4, a central spindle 5, a left HSK tool holder 6, a right HSK tool holder 7, a grinding wheel 8, a grinding rod 9, and a copper sleeve 10. The left rotary spindle 3 and the right rotary spindle 4 are both mounted on the top of the machine body 1. The central spindle 5 is clamped between the right rotary spindle 4 and the central spindle 5. The left HSK tool holder 6 is fixedly connected inside the left rotary spindle 3, and the right HSK tool holder 7 is fixedly connected inside the right rotary spindle 4. The grinding rod 9 is clamped between the left HSK tool holder 6 and the right HSK tool holder 7. The grinding wheel 8 is sleeved on the outer surface of the grinding rod 9. The copper sleeve 10 is detachably installed inside the left HSK tool holder 6 by bolts.
[0031] In this embodiment, a central chuck 11 is also fixedly installed inside the central spindle 5. The central chuck 11 is used to fit onto the outer surface of the workpiece 12. By clamping the middle part of the workpiece 12 onto the central chuck 11, further stability and clamping of the workpiece 12 are ensured, which can reduce the shaking or displacement that occurs during the grinding process.
[0032] The outer surface of the grinding rod 9 is also connected to a locking nut 14 by a thread. A clamping washer 13 is sandwiched between the locking nut 14 and the grinding wheel 8. By clamping the large diameter head of the grinding rod 9 inside the right HSK tool holder 7, the small diameter head of the grinding rod 9 is straightened by the copper sleeve 10 and clamped inside the left HSK tool holder 6. The clamping washer 13 and the locking nut 14 firmly press the grinding wheel 8 onto the outer surface of the grinding rod 9 to prevent the grinding wheel 8 from deflecting.
[0033] The grinding wheel 8 is fixed to the grinding rod 9 by the installed clamping shim 13 and locking nut 14. Then, the two ends of the grinding rod 9 are clamped inside the left HSK tool holder 6 and the right HSK tool holder 7 respectively. Then, the external thread grinding operation of the grinding wheel 8 is completed by the dressing roller mechanism 2. After the external thread grinding of the grinding wheel 8 is completed, the internal thread grinding operation of the workpiece 12 begins. During the processing, the left rotary spindle 3 and the right rotary spindle 4 are kept to rotate synchronously and form a certain speed ratio with the central spindle 5. The grinding operation of the internal thread of the workpiece 12 can be completed. The set straightening component can ensure that the grinding rod 9 and the grinding wheel 8 are in a stable working state, effectively reducing the probability of defective products in the internal thread parts of the workpiece 12 being ground.
[0034] In use, the two ends of the grinding rod 9 are clamped onto the left rotary spindle 3 and the right rotary spindle 4 respectively, so that the large-diameter end of the grinding rod 9 is clamped by the right HSK tool holder 7, and the small-diameter end of the grinding rod 9 is clamped in the left HSK tool holder 6 by the straightening of the copper sleeve 10. The grinding rod 9 is straightened to ensure that it has sufficient rigidity during machining and dressing of the grinding wheel 8, and the product will not shift. Then, the grinding wheel 8 is fixedly installed on the outer surface of the grinding rod 9 by the clamping shim 13 and the locking nut 14, and the dressing roller mechanism 2 is used to dress the grinding wheel 8. During the grinding of the internal threads of the workpiece 12 by the grinding wheel 8, the left rotary spindle 3 and the right rotary spindle 4 rotate synchronously and form a certain speed ratio with the speed of the central spindle 5. For example, the speed ratio of the three internal threads is 3:1, that is, the speed of the central spindle 5 is 5000 rpm, and the speed of the left rotary spindle 3 and the right rotary spindle 4 needs to reach 15000 rpm. During the machining, the left rotary spindle 3, the right rotary spindle 4 and the central spindle 5 can complete the grinding operation of the internal threads of the workpiece 12 through the radial and axial linkage.
[0035] To reduce the flying debris generated when the grinding wheel 8 performs internal thread grinding on the workpiece 12, such as Figures 1 to 7As shown, the protective components of the straightening mechanism for the thread grinding machine include an upper protective cover 15, a lower protective cover 16, a bearing 17, and a support foot 18. The upper protective cover 15 and the lower protective cover 16 are detachably mounted on the support foot 18. Through the bearing 17, the left HSK tool holder 6 and the right HSK tool holder 7 are in rotational contact with the bearing 17, which reduces the wear between the left HSK tool holder 6 and the right HSK tool holder 7 and the protective cover when they rotate. A fixed shaft 19 is also fixedly installed inside the support foot 18. A baffle 20 is rotatably connected to the outer surface of the fixed shaft 19. The baffle 20 is fan-shaped. An elastic limiting rod 21 is also slidably installed inside the support foot 18. The elastic limiting rod 21 can be specifically set as a spring telescopic rod, which is composed of two rod-shaped objects that are movably inserted and combined. The two rod-shaped objects are directly connected by a spring.
[0036] By installing the upper protective cover 15 and the lower protective cover 16 inside the support foot 18, and by using the baffle 20 to block the upper protective cover 15 and the lower protective cover 16, the protective covers are prevented from slipping off the left HSK tool holder 6 and the right HSK tool holder 7. At the same time, with the help of the elastic limit rod 21, the rotating baffle 20 can be limited to prevent it from rotating at will, thereby further enhancing the overall stability and safety of the protective components, minimizing the possibility of workpiece 12 debris flying onto the machine body 1 during grinding, extending the service life of the machine body 1, and ensuring the cleanliness of the processing environment.
[0037] It is worth noting that the dressing roller mechanism 2 is specifically composed of a dressing electric spindle and a diamond roller. The electric spindle is driven by a motor, converting electrical energy into mechanical energy to achieve high-speed rotation of the spindle. In the dressing roller mechanism 2, the dressing electric spindle is responsible for providing power to drive the diamond roller to rotate. The diamond roller, mounted on the dressing electric spindle, dresses the grinding wheel 8. When the diamond roller rotates, the diamond particles on its surface come into contact with the surface of the grinding wheel 8, thereby achieving the dressing operation of the grinding wheel 8 or the workpiece 12. The working principle of the above-mentioned dressing roller mechanism 2 is the prior art of the disclosed product and will not be described in detail here.
[0038] Working principle: In actual use, the two ends of the grinding rod 9 are clamped between the left rotary spindle 3 and the right rotary spindle 4, and the large diameter end of the grinding rod 9 is clamped in the right HSK tool holder 7. The small diameter end of the grinding rod 9 is clamped in the left HSK tool holder 6 by the straightening of the copper sleeve 10. The grinding rod 9 is straightened to ensure that it has sufficient rigidity and will not deviate during the machining and dressing of the grinding wheel 8. Then, the grinding wheel 8 is fixedly installed on the outer surface of the grinding rod 9 by the clamping shim 13 and the locking nut 14, and the dressing of the grinding wheel 8 is completed by the dressing roller mechanism 2.
[0039] After the external thread on the surface of the grinding wheel 8 is ground, the workpiece 12 is clamped and fixed by the central chuck 11 on the central spindle 5. Then, the left rotary spindle 3 and the right rotary spindle 4 are kept rotating synchronously and form a certain speed ratio with the central spindle 5 to perform the grinding operation on the internal thread of the workpiece 12. For example, when the speed ratio is set to 3:1, that is, the speed of the central spindle 5 is 5000 rpm, and the speed of the left rotary spindle 3 and the right rotary spindle 4 needs to reach 15000 rpm. During the processing, the left rotary spindle 3, the right rotary spindle 4 and the central spindle 5 can complete the grinding operation on the internal thread of the workpiece 12 through radial and axial linkage. By straightening the grinding wheel 8 and the grinding rod 9, the accuracy of the workpiece 12 with internal thread grinding can be kept consistent, which greatly improves the grinding efficiency and allows a single grinding wheel 8 to grind more workpieces 12, reducing the processing cost.
[0040] During the internal thread grinding process of the grinding wheel 8 on the workpiece 12, the upper protective cover 15 and the lower protective cover 16 can be sleeved on the left and right sides of the central spindle 5 through the set protective components. This reduces the amount of debris that splashes onto the parts of the machine body 1 when the workpiece 12 is grinding internal threads, ensuring a clean processing environment for the machine body 1. At the same time, after the internal thread of the workpiece 12 is processed, the upper protective cover 15 can be removed from the top of the lower protective cover 16, and the debris accumulated inside the lower protective cover 16 can be uniformly treated.
[0041] The above embodiments are only used to illustrate the technical solution of this utility model, and are not intended to limit it.
Claims
1. A centering mechanism for a thread grinding machine, characterized in that, include: The body (1) is used to provide a stable mounting base for the processed parts; The dressing roller mechanism (2) is installed on the machine body (1) and is used to perform preliminary grinding operations on the workpiece (12); The straightening assembly includes a left rotating spindle (3), a right rotating spindle (4), a central spindle (5), a left HSK tool holder (6), a right HSK tool holder (7), a grinding wheel (8), a grinding rod (9), and a copper sleeve (10). The left rotating spindle (3) is located on the top of the machine body (1), the right rotating spindle (4) is located on the top of the machine body (1), the central spindle (5) is installed on the top of the machine body (1) and sandwiched between the left rotating spindle (3) and the right rotating spindle (4), the left HSK tool holder (6) is connected to the left rotating spindle (3), the right HSK tool holder (7) is connected to the right rotating spindle (4), the grinding rod (9) is sandwiched between the left HSK tool holder (6) and the right HSK tool holder (7), the grinding wheel (8) is sleeved onto the outer surface of the grinding rod (9), and the copper sleeve (10) is located inside the left HSK tool holder (6).
2. The straightening mechanism for a thread grinding machine according to claim 1, characterized in that, The central spindle (5) is equipped with a central chuck (11), which is used to fit onto the outer surface of the workpiece (12).
3. The straightening mechanism for a thread grinding machine according to claim 1, characterized in that, The outer surface of the grinding rod (9) is connected to a locking nut (14) by a thread, and a clamping washer (13) is sandwiched between the locking nut (14) and the grinding wheel (8).
4. The straightening mechanism for a thread grinding machine according to claim 1, characterized in that, It also includes a protection component, which includes: The upper protective cover (15) and the lower protective cover (16) are symmetrically provided in two sets to prevent debris from falling onto the processing parts on the machine body (1); A bearing (17), connected to the lower protective cover (16), is used to reduce friction with the left HSK tool holder (6) and the right HSK tool holder (7); Support feet (18) are connected to the central spindle (5) and are used to support the upper protective cover (15) and the lower protective cover (16).
5. The straightening mechanism for a thread grinding machine according to claim 1, characterized in that, A fixed shaft (19) is fixedly installed inside the support foot (18). A baffle (20) is rotatably connected to the outer surface of the fixed shaft (19). The baffle (20) is fan-shaped and is used to limit the upper protective cover (15) and the lower protective cover (16).
6. The centering mechanism for a thread grinding machine according to claim 1, characterized in that, An elastic limiting rod (21) is slidably installed inside the support foot (18), and the elastic limiting rod (21) is used to limit the rotation of the baffle (20).