Method for grinding outer circle of short and small wind power planet pin shaft

Abstract

The invention relates to a method for grinding the outer circle of a short and small wind power planetary pin shaft. The machining process of the wind power planetary pin shaft comprises the steps of blanking, turning the outer circle, drilling, deburring, carburizing and quenching, shot blasting, grinding a central hole, grinding the outer circle, cleaning, packaging and warehousing. In the outer circle grinding process, double ejector pins abut against ground center holes in the two ends of a workpiece, a clamping tool is used for clamping the outer circle of a thin step at the end of the workpiece, and the outer circle of the workpiece and the end face of the thin step are finely ground through one-time clamping. A stepped hole is formed in the clamping tool, the step height of the stepped hole is smaller than the thickness of a thin step of a workpiece, the clamping tool is arranged on the outer circle of the thin step of the workpiece in a sleeved mode through the stepped hole, a plurality of threaded holes are formed in the clamping tool in the radial direction, compression screws are arranged in the threaded holes, one end of each compression screw is attached to the outer circle of the thin step of the workpiece in a pressed mode, and the other end of each compression screw is connected with the clamping tool. And the cylindrical grinding machine drives the workpiece to rotate through the compression screw. By improving the clamping tool, the workpiece can be stably clamped, accurate grinding of the outer circle and the thin step end face is completed in one-time clamping, the problem that the end face of the workpiece cannot be ground is solved, and the machining procedure is greatly simplified.

Description

Technical Field

[0001] The invention belongs to the technical field of mechanical processing and relates to a method for external cylindrical grinding of a short wind power planetary pin shaft. Background Art

[0002] Today, the requirements for wind turbine gearboxes are to be smaller and lighter, so the size of parts is getting smaller and smaller while the structure of parts remains unchanged, and the range of choices for processing machine tools is smaller. If the processing machine tools remain unchanged, some general tools will be limited in use.

[0003] like Figure 1 , 2 As shown in the figure, some wind power planetary pins have a small outer diameter and a short total length. Since the total length is narrower than the grinding wheel width of the cylindrical grinding machine and the width of the universal chicken heart chuck is greater than the size L1, the end face B cannot be ground. Therefore, the traditional method is to make the planetary pins in a double-jointed form, and the processing flow is: cutting → turning → drilling → deburring → carburizing and quenching → shot blasting → grinding center hole → cylindrical grinding → tool grinding (cutting one into two pieces) → turning → cleaning, packaging → warehousing; after the cylindrical grinding of the finished product, the tool grinding process is used to cut the double-jointed planetary pins into two, and then the ground outer circle is clamped and the total long end face is turned flat, and the finished parts are processed in this way; but this processing method requires turning and cutting after heat treatment. Since the hardness of the workpiece is high after heat treatment, the tool wear is large and the processing cycle is prolonged. Summary of the invention

[0004] In view of this, the object of the present invention is to solve the above-mentioned problem and provide a method for external cylindrical grinding of a short wind power planetary pin shaft.

[0005] In order to achieve the above object, the present invention provides the following technical solutions:

[0006] A method for external cylindrical grinding of a short wind power planetary pin shaft, wherein the processing flow of the short wind power planetary pin shaft is blanking → turning the external cylindrical surface → drilling → deburring → carburizing and quenching → shot blasting → grinding the center hole → external cylindrical grinding → cleaning, packaging → warehousing;

[0007] In the external cylindrical grinding process, double ejectors are used to push the center holes ground at both ends of the workpiece, and the outer circle of the thin step at the end of the workpiece is clamped by a clamping tool. The outer circle of the workpiece and the end face of the thin step are finely ground in one clamping.

[0008] A stepped hole is provided in the clamping fixture, and the step height of the stepped hole is smaller than the thickness of the thin step of the workpiece. The clamping fixture is mounted on the outer circle of the thin step of the workpiece through the stepped hole. A plurality of threaded holes are radially provided on the clamping fixture, and a clamping screw is provided in the threaded hole. One end of the clamping screw is pressed against the outer circle of the thin step of the workpiece, and the external cylindrical grinder drives the workpiece to rotate through the clamping screw.

[0009] Furthermore, when the thickness of the thin step is smaller than the diameter of the clamping screw, the end face of the clamping screw is only partially pressed against the outer circle of the thin step of the workpiece.

[0010] Furthermore, the threaded holes on the clamping fixture are multiple and evenly distributed around the circumference.

[0011] Furthermore, the inner diameter of the stepped hole is 0.1 to 0.3 mm larger than the outer diameter of the thin step of the workpiece. When a small gap is used, the clamping screw can be tightened without a large locking force.

[0012] Further, the head of the clamping screw does not extend beyond the end surface of the stepped hole.

[0013] The beneficial effects of the present invention are:

[0014] 1. The present invention improves the clamping tooling so that the workpiece can be stably clamped and the fine grinding of the outer circle and the thin step end face can be completed in one clamping, thus avoiding the problem that the workpiece cannot be ground on the end face and greatly simplifying the processing procedure.

[0015] 2. The clamping fixture of the present invention has a simple design structure and adopts stepped holes and clamping screws to achieve clamping. It can effectively and stably clamp short wind power planetary pins and drive the workpiece to rotate through the clamping screws. This design can not only achieve high-precision external cylindrical grinding, but also avoid the use of complex and expensive clamping tools, reducing production input costs.

[0016] Other advantages, objectives and features of the present invention will be described in the following description to some extent, and to some extent, will be obvious to those skilled in the art based on the following examination and study, or can be taught from the practice of the present invention. The objectives and other advantages of the present invention can be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be described in detail below in conjunction with the accompanying drawings, wherein:

[0018] Figure 1 It is a schematic diagram of the wind power planetary pin shaft in the present invention.

[0019] Figure 2 This is a traditional processing method for the external cylindrical grinding of wind power planetary pins.

[0020] Figure 3 It is a schematic diagram of the clamping tool in the present invention.

[0021] Figure 4 It is a schematic diagram of the external cylindrical grinding of the wind power planetary pin shaft in the present invention. DETAILED DESCRIPTION

[0022] The following describes the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments only illustrate the basic concept of the present invention in a schematic manner, and the following embodiments and features in the embodiments can be combined with each other without conflict.

[0023] Among them, the drawings are only used for illustrative explanations, and they only represent schematic diagrams rather than actual pictures, and should not be understood as limitations on the present invention. In order to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of actual products. For those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0024] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right", "front", "rear", etc. indicate the orientation or position relationship, they are based on the orientation or position relationship shown in the drawings, which is 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 operate in a specific orientation. Therefore, the terms describing the position relationship in the drawings are only used for illustrative purposes and cannot be understood as limiting the present invention. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0025] See also Figure 1 , 3 4. A method for external cylindrical grinding of a short wind turbine planetary pin shaft. The processing flow of the short wind turbine planetary pin shaft is blanking → turning the external cylindrical surface → drilling → deburring → carburizing and quenching → shot blasting → grinding the center hole → external cylindrical grinding → cleaning, packaging → warehousing;

[0026] The planetary pin needs to be carburized and quenched, and the surface hardness reaches HRC58-62. The finished product has a high-precision outer circle of about Ra0.4. Therefore, in the outer cylindrical grinding process, a double ejector is used to push the center holes ground at both ends of the workpiece, and a clamping tool is used to clamp the outer circle of the thin step at the end of the workpiece, and the outer circle of the workpiece and the end face of the thin step are finely ground in one clamping.

[0027] A stepped hole is provided in the clamping fixture, and the step height of the stepped hole is smaller than the thickness of the thin step of the workpiece. The clamping fixture is mounted on the outer circle of the thin step of the workpiece through the stepped hole. The clamping fixture is radially provided with a plurality of threaded holes, and clamping screws are installed in the threaded holes. One end of the clamping screw is pressed against the outer circle of the thin step of the workpiece, and the external cylindrical grinder drives the workpiece to rotate through the clamping screw.

[0028] When the thickness of the thin step is smaller than the diameter of the clamping screw, the end face of the clamping screw is only partially pressed against the outer circle of the thin step of the workpiece, and the head of the clamping screw does not exceed the end face of the stepped hole.

[0029] The threaded holes on the clamping fixture are evenly distributed on the circumference for backup.

[0030] Among them, the inner diameter of the stepped hole is 0.1 to 0.3 mm larger than the outer diameter of the thin step of the workpiece. When a small gap is used, the clamping screw can be tightened without a large locking force.

[0031] By adopting the method in this embodiment, the tool grinding and finishing processes after carburizing and quenching are reduced, and a single-piece production mode is adopted, which is more conducive to re-inspection of the outer circle runout of the finished product.

[0032] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution, which should be included in the scope of the claims of the present invention.

Claims

1. A method for external cylindrical grinding of short wind power planetary pin shafts, characterized in that: The processing flow of the wind power planetary pin shaft is cutting → turning the outer circle → drilling → deburring → carburizing and quenching → shot blasting → grinding the center hole → outer circle grinding → cleaning, packaging → warehousing; In the external cylindrical grinding process, double ejectors are used to push the center holes ground at both ends of the workpiece, and the outer circle of the thin step at the end of the workpiece is clamped by a clamping tool. The outer circle of the workpiece and the end face of the thin step are finely ground in one clamping. A stepped hole is provided in the clamping fixture, and the step height of the stepped hole is smaller than the thickness of the thin step of the workpiece. The clamping fixture is mounted on the outer circle of the thin step of the workpiece through the stepped hole. A plurality of threaded holes are radially provided on the clamping fixture, and a clamping screw is provided in the threaded hole. One end of the clamping screw is pressed against the outer circle of the thin step of the workpiece, and the external cylindrical grinder drives the workpiece to rotate through the clamping screw.

2. The method for external cylindrical grinding of short wind power planetary pins according to claim 1, characterized in that: When the thickness of the thin step is smaller than the diameter of the clamping screw, the end face of the clamping screw is only partially pressed against the outer circle of the thin step of the workpiece.

3. The method for external cylindrical grinding of short wind power planetary pins according to claim 1, characterized in that: The threaded holes on the clamping fixture are multiple and evenly distributed around the circumference.

4. The method for external cylindrical grinding of short wind power planetary pins according to claim 1, characterized in that: The inner diameter of the stepped hole is 0.1 to 0.3 mm larger than the outer diameter of the thin step of the workpiece.

5. The method for external cylindrical grinding of short wind power planetary pins according to claim 1, characterized in that: The head of the clamping screw does not extend beyond the end face of the stepped hole.

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