High-precision numerical control curved surface feeding grinding machine for cycloidal-pin wheel

Abstract

The high-precision numerical control curved surface feeding grinding machine comprises a machine body, a workpiece feeding mechanism is arranged in the machine body, and a cutter feeding mechanism is correspondingly arranged on one side of the output end of the workpiece feeding mechanism; the workpiece feeding mechanism is used for controlling self-rotation and eccentric revolution motion of a workpiece; the tool feeding mechanism controls self-rotation, the feeding amount and the overall lifting height of a tool. The workpiece feeding mechanism is matched with the cutter feeding mechanism to conduct five-axis linkage, and outer teeth and square and round holes of a workpiece are machined under one-time clamping.

Description

Technical Field

[0001] The invention relates to the field of mechanical precision machining, and in particular to a high-precision CNC curved surface feed grinder for a cycloidal pin wheel. Background Art

[0002] The cycloid pinwheel transmission is mainly composed of a cycloid disk, a pinwheel, an input shaft and an output shaft. The cycloid disk is a key component, and its outer contour is in the shape of a cycloid. During the transmission process, the cycloid teeth of the cycloid disk mesh with the pinwheel teeth. Due to the special shape of the cycloid disk, its meshing mode with the pinwheel has the characteristics of multiple teeth meshing at the same time, making the transmission process smoother and able to withstand larger loads. In the traditional cycloid disk processing process, there are problems such as low external tooth precision and poor consistency in external tooth and square and round hole processing.

[0003] Chinese patent CN201610173677.4 discloses a method for processing a cycloid gear, comprising the following steps: fixing the cycloid gear to be processed on a workbench of a five-axis linkage CNC machine tool, controlling a flat-bottomed cutter to rotate around the B-axis of the five-axis linkage CNC machine tool through the five-axis linkage CNC machine tool, so that the flat-bottomed cutter's cutter axis elevation angle is fixed at θ, and the flat-bottomed cutter faces the contour of the cycloid gear; the flat-bottomed cutter rotates at high speed around its own axis to start processing the cycloid gear, and the cycloid gear performs up and down milling motion along the Z-axis of the five-axis linkage CNC machine tool with the workbench, and after each trajectory is completed, the cycloid gear rotates around the C-axis of the five-axis linkage CNC machine tool by an angle with the workbench, and the processing is cyclically repeated until the entire gear is end-milled.

[0004] However, this technical solution can only process external teeth, and cannot process square holes without re-clamping. It needs to be replaced on other machine tools for secondary clamping, which is not conducive to ensuring the consistency of external teeth and square holes processing. Summary of the invention

[0005] The purpose of the present invention is to address the deficiencies in the prior art and to provide a high-precision CNC curved surface feed grinder for a cycloidal pin wheel. Through the five-axis linkage of a workpiece feeding mechanism and a tool feeding mechanism, the external teeth and square and circular holes of the workpiece can be processed in one clamping, without the need to replace the machine tool for secondary clamping, thereby ensuring the consistency of the external teeth and square and circular hole processing and improving the dimensional processing accuracy.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a high-precision CNC curved surface feed grinder for a cycloidal pin wheel, comprising a machine body, a workpiece feeding mechanism is arranged inside the machine body, and a tool feeding mechanism is arranged correspondingly on one side of the output end of the workpiece feeding mechanism; the workpiece feeding mechanism controls the self-rotation and eccentric revolution of the workpiece; the tool feeding mechanism controls the self-rotation, feed amount and overall lifting height of the tool; the workpiece feeding mechanism cooperates with the tool feeding mechanism in five-axis linkage to process the external teeth and square and round holes of the workpiece in one clamping.

[0007] Preferably, the workpiece feeding mechanism includes a fixed block fixedly arranged on the inner wall of the body, the fixed block is provided with a through hole, an eccentric shell is rotatably arranged penetrating the through hole, the eccentric shell is fixedly mounted on a cylindrical gear, the cylindrical gear is meshed with a driving gear, and the driving gear is sleeved on the power shaft of the power member and is driven to rotate by the power member.

[0008] Preferably, an eccentric circular hole is provided on the eccentric shell, a first electric spindle is rotatably arranged in the eccentric circular hole, a connecting seat is fixedly mounted on the output end of the first electric spindle and drives the connecting seat to rotate, and a disk seat is fixedly mounted on the other end of the connecting seat.

[0009] Preferably, a sliding groove is provided on the side of the fixed block away from the cylindrical gear, a movable block is slidably provided in the sliding groove, an elliptical groove is provided on the movable block, and a first bearing is also provided at the output end of the first electric spindle, and the first bearing slides in the elliptical groove.

[0010] As a preference, a positioning claw is detachably mounted on the disk seat.

[0011] Preferably, the disk seat is located at one side of the outer wall of the body, and a labyrinth dustproof structure is formed between one end of the disk seat mounting portion and the outer wall.

[0012] As a preference, the power member is fixedly mounted on one end of the shell, the other end of the shell is fixedly disposed on the fixed block, and the shell covers the outside of the cylindrical gear and the driving gear.

[0013] Preferably, the tool feeding mechanism comprises a mounting seat, which is fixedly mounted on one side of the outer wall of the body and is located directly below the disk seat, and a first ball screw is vertically arranged on the mounting seat.

[0014] Preferably, a base is slidably disposed on the first ball screw, a second ball screw is horizontally disposed on the base, and the second ball screw is perpendicular to the magnetic end face of the disk seat.

[0015] As a preference, an electric spindle housing is slidably disposed on the second ball screw, a second electric spindle is disposed on the electric spindle housing, and the second electric spindle drives the tool to rotate and grind.

[0016] The beneficial effects of the present invention are: (1) The present invention realizes five-axis linkage by coordinating the workpiece feeding mechanism with the tool feeding mechanism, and processes the external teeth and square and round holes of the workpiece in one clamping, without the need to replace the machine tool for secondary clamping, thereby ensuring the consistency of the external teeth and square and round holes processing and improving the dimensional processing accuracy.

[0017] (2) The present invention realizes the feeding of the workpiece by combining the crank principle with a sliding movable block, thereby reducing the vibration intensity of the workpiece feeding mechanism, extending the service life of the high-precision, high-speed electric spindle, and avoiding the problem of early failure of the fastener due to axial force under reciprocating motion, thereby improving the quality of the machine tool.

[0018] (3) The present invention provides a magnetic disk seat in combination with a detachably mounted positioning claw, which facilitates quick positioning of the workpiece and simple fixed installation, and can also replace the positioning claws of corresponding sizes for workpieces of different sizes, thereby widening the production range and saving production costs.

[0019] (4) The present invention controls the feeding of the tool feeding mechanism by arranging the first ball screw and the second ball screw, thereby reducing the creeping phenomenon and achieving precise micro-feeding. In addition, during the reciprocating motion, the feeding is stable and the vibration phenomenon is less.

[0020] In summary, the present invention has the advantages of high machining accuracy, good consistency, high quality, stable feeding, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a partial schematic diagram of the present invention; Figure 3 It is a partial cross-sectional view of the present invention; Figure 4 It is a partial schematic diagram of the present invention; Figure 5 It is a partial schematic diagram of the present invention; Figure 6 It is a partial schematic diagram of the present invention; Figure 7 It is a partial schematic diagram of the present invention; Figure 8 It is a partial cross-sectional view of the present invention; Fig. 9 It is a schematic diagram of the workpiece of the present invention.

[0022] The accompanying drawings are marked as follows: 1. Machine body; 2. Workpiece feeding mechanism; 21. Fixed block; 211. Through hole; 212. Slide groove; 22. Eccentric housing; 221. Eccentric circular hole; 23. Cylindrical gear; 24. Driving gear; 25. Power part; 251. Housing; 26. First electric spindle; 261. First bearing; 27. Connecting seat; 28. Disk seat; 281. Claw; 282. Labyrinth dustproof structure; 29. ​​Movable block; 291. Elliptical groove; 3. Tool feeding mechanism; 31. Mounting seat; 32. First ball screw; 33. Base; 34. Second ball screw; 35. Electric spindle housing; 36. Second electric spindle; 37. Driving part; 38. Auxiliary slide rail. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0025] Embodiment 1 like Figures 1 to 9As shown, this embodiment provides a high-precision CNC curved surface feed grinder for a cycloidal pin wheel, comprising a machine body 1, wherein a workpiece feeding mechanism 2 is arranged inside the machine body 1, and a tool feeding mechanism 3 is correspondingly arranged on one side of the output end of the workpiece feeding mechanism 2; the workpiece feeding mechanism 2 controls the self-rotation and eccentric revolution of the workpiece; the tool feeding mechanism 3 controls the self-rotation, feed amount and overall lifting height of the tool; the workpiece feeding mechanism 2 cooperates with the tool feeding mechanism 3 in five-axis linkage to process the external teeth and square and round holes of the workpiece under one clamping.

[0026] like Figures 3 to 7 As shown, the workpiece feeding mechanism 2 includes a fixed block 21 fixedly arranged on the inner wall of the body 1, and a through hole 211 is opened on the fixed block 21. An eccentric shell 22 is rotatably arranged to penetrate the through hole 211. The eccentric shell 22 is fixedly installed on a cylindrical gear 23. The cylindrical gear 23 is meshed with a driving gear 24. The driving gear 24 is sleeved on the power shaft of a power member 25 and is driven to rotate by the power member 25.

[0027] It should be noted that the power member 25 drives the driving gear 24 to rotate, and the driving gear 24 engages with the cylindrical gear 23 and drives the cylindrical gear 23 to rotate, and the eccentric housing 22 fixedly mounted on the cylindrical gear 23 rotates therewith.

[0028] like Figures 3 to 7 As shown, an eccentric circular hole 221 is opened on the eccentric shell 22, and a first electric spindle 26 is rotatably arranged in the eccentric circular hole 221. A connecting seat 27 is fixedly installed on the output end of the first electric spindle 26 and drives the connecting seat 27 to rotate. A disk seat 28 is fixedly installed on the other end of the connecting seat 27.

[0029] It should be noted that when the eccentric housing 22 rotates, the eccentric circular hole 221 performs eccentric circular motion, and the first electric spindle 26 follows the eccentric circular hole 221 to perform eccentric circular motion. At the same time, the output shaft of the first electric spindle 26 rotates, driving the disk seat 28 to rotate synchronously through the connecting seat 27.

[0030] like Figures 3 to 7 As shown, a slide groove 212 is provided on the side of the fixed block 21 away from the cylindrical gear 23, a movable block 29 is slidably provided in the slide groove 212, an elliptical groove 291 is provided on the movable block 29, and a first bearing 261 is also provided at the output end of the first electric spindle 26, and the first bearing 261 slides in the elliptical groove 291.

[0031] It should be noted here that since the output end of the first electric spindle 26 is installed on the elliptical groove 291 through the first bearing 261, when performing eccentric circular motion, the first electric spindle 26 will drive the movable block 29 to slide up and down in the fixed block 21, and drive the first bearing 261 to slide left and right in the elliptical groove 291.

[0032] It is worth mentioning here that by providing the movable block 29 and opening the elliptical groove 291 thereon, the first electric spindle 26 can be supported and limited without affecting the eccentric circular motion and rotational motion of the first electric spindle 26, thereby preventing the first electric spindle 26 from vibrating and maintaining the stability of the first electric spindle 26.

[0033] like Figure 1 , 3 As shown, a positioning claw 281 is detachably mounted on the disk seat 28 .

[0034] It is worth mentioning here that the detachable positioning claws can facilitate the quick positioning and simple fixed installation of the workpiece, and can also replace the positioning claws of corresponding sizes for workpieces of different sizes, which has a wide production range and saves production costs.

[0035] The disk seat 28 is located at one side of the outer wall of the body 1 , and a labyrinth dustproof structure 282 is formed between one end of the mounting portion of the disk seat 28 and the outer wall.

[0036] It is worth mentioning here that a large amount of chips will be generated during the operation of the machine tool. The maze dustproof structure 282 can greatly reduce the chips from falling into the precision parts of the machine tool and causing damage, reduce the frequency of cleaning work, and improve production efficiency.

[0037] like Figure 3 As shown, the power member 25 is fixedly mounted on one end of a housing 251 , and the other end of the housing 251 is fixedly disposed on the fixing block 21 . The housing 251 covers the outside of the cylindrical gear 23 and the driving gear 24 .

[0038] It is worth mentioning here that the housing 251 not only protects its internal structure from dust, but also prevents lubricating oil leakage, reduces the noise generated by the internal gear meshing transmission, and improves the comfort of production personnel.

[0039] Embodiment 2 like Figure 1 , 8 As shown, the components that are the same or corresponding to those in Example 1 are marked with the corresponding figure marks in Example 1. The tool feeding mechanism 3 includes a mounting seat 31, which is fixedly mounted on one side of the outer wall of the body 1 and is located directly below the disk seat 28. A first ball screw 32 is vertically arranged on the mounting seat 31.

[0040] It is worth mentioning here that the vertically arranged first ball screw 32 can effectively prevent the load from sliding down due to gravity under appropriate braking or self-locking mechanism, thereby improving the safety and reliability of the working platform. Compared with some other vertical transmission methods, such as ordinary screw transmission, the first ball screw 32 has a stronger load-bearing capacity and can adapt to heavier loads.

[0041] like Figure 8 As shown, a base 33 is slidably disposed on the first ball screw 32 , a second ball screw 34 is horizontally disposed on the base 33 , and the second ball screw 34 is perpendicular to the magnetic end surface of the disk seat 28 .

[0042] It is worth mentioning here that the horizontally arranged second ball screw 34 is easy to install and debug, and the gravity direction of the load is perpendicular to the axis of the second ball screw 34. Such a setting makes the load distribution on the screw more even, effectively reduces local stress concentration, and is conducive to extending the service life of the second ball screw 34.

[0043] It should be noted here that a driving member 37 is provided at the end of the first ball screw 32 and the second ball screw 34 to drive the first ball screw 32 and the second ball screw 34 to operate; auxiliary slide rails 38 are also provided on both sides of the first ball screw 32 and the second ball screw 34 to further maintain stability.

[0044] like Figure 8 As shown, an electric spindle housing 35 is slidably disposed on the second ball screw 34 , and a second electric spindle 36 is disposed on the electric spindle housing 35 . The second electric spindle 36 drives the tool to rotate and grind.

[0045] It is worth mentioning here that the tool is driven by the second electric spindle 36, which has excellent dynamic response performance. When processing complex contour shapes, the second electric spindle 36 can quickly change the tool rotation speed according to instructions and better follow the processing path, thereby improving the processing accuracy and processing quality.

[0046] Working steps The power piece 25 drives the driving gear 24 to rotate, and the driving gear 24 meshes with the cylindrical gear 23 and drives it to rotate. The eccentric housing 22 fixedly mounted with the cylindrical gear 23 rotates with it. When the eccentric housing 22 rotates, the eccentric circular hole 221 makes an eccentric circular motion, and the first electric spindle 26 follows the eccentric circular hole 221 to make an eccentric circular motion. At the same time, the output shaft of the first electric spindle 26 rotates, and drives the disk seat 28 to rotate synchronously through the connecting seat 27. The output end of the first electric spindle 26 is installed on the elliptical groove 291 through the first bearing 261. When performing the eccentric circular motion, the first electric spindle 26 will drive the movable block 29 to slide up and down in the fixed block 21, and drive the first bearing 261 to slide left and right at the elliptical groove 291.

[0047] The first ball screw 32 and the second ball screw 34 control the stroke of the tool feeding mechanism 3, the second electric spindle 36 drives the tool to rotate and grind, and the workpiece feeding mechanism 2 cooperates with the tool feeding mechanism 3 to perform five-axis linkage to process the external teeth and square and round holes of the workpiece in one clamping.

[0048] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A high-precision CNC curved surface feed grinding machine for a cycloidal pin wheel, comprising a machine body, characterized in that: A workpiece feeding mechanism is arranged inside the machine body, and a tool feeding mechanism is arranged correspondingly on one side of the output end of the workpiece feeding mechanism; The workpiece feeding mechanism controls the self-rotation and eccentric revolution of the workpiece; The tool feeding mechanism controls the tool self-rotation, feed amount and overall lifting height; The workpiece feeding mechanism cooperates with the tool feeding mechanism in five-axis linkage to process the external teeth and square and round holes of the workpiece in one clamping.

2. A high-precision CNC curved surface feed grinder for a cycloidal pin wheel according to claim 1, characterized in that: The workpiece feeding mechanism includes a fixed block fixedly arranged on the inner wall of the machine body, a through hole is opened on the fixed block, an eccentric shell is rotatably arranged penetrating the through hole, the eccentric shell is fixedly installed on a cylindrical gear, the cylindrical gear is meshed with a driving gear, and the driving gear is sleeved on the power shaft of the power member and driven to rotate by the power member.

3. A high-precision CNC curved surface feed grinder for a cycloidal pin wheel according to claim 2, characterized in that: An eccentric circular hole is provided on the eccentric shell, a first electric spindle is rotatably arranged in the eccentric circular hole, a connecting seat is fixedly installed on the output end of the first electric spindle and drives the connecting seat to rotate, and a magnetic disk seat is fixedly installed on the other end of the connecting seat.

4. A high-precision CNC curved surface feed grinder for a cycloidal pin wheel according to claim 3, characterized in that: A slide groove is provided on the side of the fixed block away from the cylindrical gear, a movable block is slidably arranged in the slide groove, an elliptical groove is provided on the movable block, and a first bearing is also provided at the output end of the first electric spindle, and the first bearing slides in the elliptical groove.

5. The high-precision CNC curved surface feed grinder for cycloid pinwheel according to claim 3, characterized in that: The magnetic disk seat is detachably provided with a positioning claw.

6. The high-precision CNC curved surface feed grinder for cycloid pinwheel according to claim 3, characterized in that: The disk seat is located at one side of the outer wall of the body, and a labyrinth dustproof structure is formed between one end of the disk seat mounting portion and the outer wall.

7. A high-precision CNC curved surface feed grinder for a cycloidal pin wheel according to claim 2, characterized in that: The power member is fixedly mounted on one end of the shell, and the other end of the shell is fixedly arranged on the fixing block. The shell covers the outside of the cylindrical gear and the driving gear.

8. The high-precision CNC curved surface feed grinder for cycloid pinwheel according to claim 3, characterized in that: The tool feeding mechanism comprises a mounting seat, which is fixedly mounted on one side of the outer wall of the body and is located directly below the magnetic disk seat. A first ball screw is vertically arranged on the mounting seat.

9. A high-precision CNC curved surface feed grinder for a cycloidal pin wheel according to claim 8, characterized in that: A base is slidably arranged on the first ball screw, a second ball screw is horizontally arranged on the base, and the second ball screw is perpendicular to the magnetic end surface of the disk seat.

10. A high-precision CNC curved surface feed grinder for a cycloidal pin wheel according to claim 9, characterized in that: An electric spindle housing is slidably arranged on the second ball screw, a second electric spindle is arranged on the electric spindle housing, and the second electric spindle drives the tool to rotate and grind.

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