Machining method of small-modulus combined gear

Abstract

The invention relates to a machining method of a small-modulus combined gear. The invention discloses a machining method of a small-modulus combined gear. The machining method is characterized by comprising the following steps: S1, hobbing a shaft gear workpiece; s2, assembling the shaft gear workpiece and the gear sheet workpiece which is not subjected to hobbing so as to obtain a combined gear; s3, the fixed part of the positioning tool is fixed to the fixed part of the gear hobbing machine, the shaft gear workpiece of the combined gear is clamped through a clamping mechanism of the gear hobbing machine, and the end face of the movable part of the positioning tool makes contact with the end face of the tooth piece workpiece of the combined gear; wherein one end of the fixed part is used for being fixed with the fixed part, and the movable part is fixed in the other end of the fixed part in a rolling manner; s4, hobbing is conducted on the tooth piece workpiece; and S5, deburring and polishing the combined gear. The combined gear has the advantages that the tooth profile machining precision can be improved, the tooth end face precision of the combined gear can be guaranteed, and effective meshing can be achieved during use.

Description

Technical Field

[0001] The invention relates to a method for machining a small-module combined gear. Background Art

[0002] For small-module combined gears (gear assemblies with a maximum gear outer diameter of less than 50 mm), the gear workpiece and the shaft gear workpiece are usually hobbed first, and then the shaft gear workpiece is placed on a pad with a center hole, and then the gear workpiece is sleeved on the shaft gear, and the gear workpiece is pressed onto the shaft gear workpiece by a press to obtain a combined gear.

[0003] In order to facilitate the tight fit of the small-module gear workpiece and the shaft gear workpiece, thread rolling will be performed on the shaft gear workpiece, but the thread rolling accuracy is poor, and the coaxial accuracy of the gear workpiece and the shaft gear workpiece during press assembly cannot be guaranteed, resulting in large end face runout of the combined gear, poor accuracy level and use stability of the combined gear, and the combined gear needs to be processed again using lathes and other gear hobbing equipment. Summary of the invention

[0004] The object of the present invention is to provide a method for machining small-module combined gears which can improve the machining accuracy of tooth profiles, ensure the tooth end face accuracy of combined gears and effectively mesh during use.

[0005] To achieve the above object, the present invention adopts a method for processing a small-module combined gear, which is characterized by comprising the following steps: S1. Perform gear hobbing of shaft gear workpieces; S2. Assemble the shaft gear workpiece and the unfinished gear hobbing workpiece to obtain a combined gear; S3. Fix the fixed part of the positioning tool at the fixed position of the gear hobbing machine, clamp the shaft gear workpiece of the combined gear through the clamping mechanism of the gear hobbing machine, and make the end face of the movable part of the positioning tool contact with the end face of the tooth plate workpiece of the combined gear; wherein the positioning tool comprises a fixed part and a movable part, the fixed part and the movable part both pass through opposite ends, one end of the fixed part is used to be fixed to the fixed position, and the movable part is rollingly fixed in the other end of the fixed part, and when the clamping mechanism clamps the shaft gear workpiece, the shaft gear workpiece extends into the movable part; S4. Performing gear hobbing of the gear workpiece; S5. Deburring and polishing of combined gears.

[0006] When the method of the present invention is used to process small-module combined gears, the tooth shape of the shaft gear workpiece is first processed, and then the shaft gear workpiece and the combined gear are press-assembled in an existing manner (thread rolling can be performed on the shaft gear workpiece), and then the assembled combined gear is clamped on a gear hobbing device such as a machine tool, and the end face of the gear workpiece is brought into contact with the end face of the movable part of the positioning tooling, and then the gear workpiece is subjected to gear hobbing, and finally deburring and polishing processes are performed.

[0007] The present invention adopts a positioning tool to support the tooth workpiece, and then performs tooth profile processing on the tooth workpiece after the combined gears are assembled. Since the movable part of the positioning tool is rollingly set on the fixed part, the movable part can adaptively rotate to ensure effective contact and support with the end face of the tooth workpiece, and avoid deformation of the tooth workpiece due to axial force when the gear is rolled, so that a tooth structure coaxial with the shaft gear workpiece can be processed on the tooth workpiece, thereby ensuring that the relative position accuracy between the two tooth profile structures of the small-module combined gear is higher, the tooth profile processing accuracy can be improved, and the tooth end face accuracy of the combined gear and effective meshing during use can be ensured.

[0008] Preferably, the fixed component includes an avoidance groove along the axial direction for making way for the end of the clamping mechanism and a rolling groove for rollingly setting the movable component, the avoidance groove and the rolling groove are connected, the rolling groove wall and the outer wall of the movable component are matching spherical structures, the rolling groove wall is directly in contact with the outer wall of the movable component, and the end of the movable component extends out of the fixed component.

[0009] Preferably, the width of the portion of the fixing component provided with the avoidance groove is greater than the width of the portion of the fixing component provided with the rolling groove, the width of the rolling groove is greater than the width of the end of the clamping mechanism, and the end of the fixing component away from the rolling groove is provided with a protrusion extending circumferentially outward, and the protrusion is provided with a fixing hole for fixing to the fixing part fastener.

[0010] Preferably, a matching groove is respectively provided on the groove walls on opposite sides of the rolling groove, the matching groove passes through the end surface of the fixing component, and the distance between the groove walls of the two matching grooves is greater than or equal to the maximum inner diameter of the rolling groove.

[0011] Preferably, when the end face of the movable component is in contact with the end face of the gear workpiece, the distance between the inner wall of the movable component and the shaft gear workpiece is greater than the wall thickness of the movable component.

[0012] The invention has the advantages of improving the tooth profile processing accuracy, ensuring the tooth end face accuracy of the combined gear and effective meshing during use. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of the positioning tool of the present invention when in use.

[0014] Figure 2 It is a structural schematic diagram of the fixing components of the positioning tool of the present invention. DETAILED DESCRIPTION

[0015] The present invention will be further described below based on the accompanying drawings and specific embodiments.

[0016] A method for processing a small-module combined gear in this embodiment includes the following steps: S1. Perform gear hobbing of the shaft gear workpiece 1; S2. Assemble the shaft gear workpiece 1 and the unfinished gear hobbing workpiece 2 to obtain a combined gear; S3. Fix the combined gear on the clamping mechanism 3 of the gear hobbing machine, and effectively support the gear workpiece 2 of the combined gear by positioning the tooling to ensure that the gear workpiece 2 is in the correct position during subsequent processing to avoid shaking of the edge of the gear workpiece 2, thereby causing poor tooth processing of the edge of the gear workpiece; S4 performs gear hobbing of the gear workpiece 2; S5. Deburring and polishing of combined gears.

[0017] Depend on Figure 1 and Figure 2 As shown, in step S3, the fixed component 4 of the positioning tool is fixed at the fixed position of the gear hobbing machine, the shaft gear workpiece 1 of the combined gear is clamped by the clamping mechanism 3 of the gear hobbing machine, and the end face of the movable component 5 of the positioning tool is in contact with the end face of the gear plate workpiece 2 of the combined gear.

[0018] The positioning fixture includes a fixed component 4 and a movable component 5, both of which pass through opposite ends. One end of the fixed component 4 is used to be fixed to the fixed part of the gear hobbing machine, and the movable component 5 is rolled and fixed in the other end of the fixed component 4. The movable component 5 and the fixed component 4 form a structure similar to a universal joint. When the clamping mechanism clamps the shaft gear workpiece 1, the shaft gear workpiece 1 extends into the movable component 5. Among them, when the end face of the movable component 5 is in contact with the end face of the gear workpiece 2, the distance between the inner wall of the movable component 5 and the shaft gear workpiece is greater than the wall thickness of the movable component 5.

[0019] The fixed component 4 includes an avoidance groove 41 for making way for the end of the clamping mechanism 3 and a rolling groove 42 for rollingly setting the movable component 5 along the axial direction. The avoidance groove 41 and the rolling groove 42 are connected, and the groove wall of the rolling groove 42 and the outer wall of the movable component 5 are matching spherical structures. The groove wall of the rolling groove 42 is directly in contact with the outer wall of the movable component 5, and the end of the movable component 5 extends out of the fixed component 4.

[0020] The width of the portion of the fixing component 4 provided with the avoidance groove 41 is greater than the width of the portion of the fixing component 4 provided with the rolling groove 42. The width of the rolling groove 42 is greater than the width of the end of the clamping mechanism 3. The end of the fixing component 4 away from the rolling groove 42 is provided with a protrusion 40 extending circumferentially outward. The protrusion 40 is provided with a waist-shaped fixing hole for fixing with a fastener at the fixing part.

[0021] A matching groove 43 is respectively provided on the groove walls on the opposite sides of the rolling groove 42 . The matching groove 43 penetrates the end surface of the fixing component 4 . The distance between the groove walls of the two matching grooves 43 is greater than or equal to the maximum inner diameter of the rolling groove 42 .

[0022] The invention has the advantages of improving the tooth profile processing accuracy, ensuring the tooth end face accuracy of the combined gear and effective meshing during use.

Claims

1. A method for processing small-module combined gears, characterized in that The steps include: S1. Perform gear hobbing of shaft gear workpieces; S2. Assemble the shaft gear workpiece and the unfinished gear hobbing workpiece to obtain a combined gear; S3. Fix the fixed part of the positioning tool at the fixed position of the gear hobbing machine, clamp the shaft gear workpiece of the combined gear through the clamping mechanism of the gear hobbing machine, and make the end face of the movable part of the positioning tool contact with the end face of the tooth plate workpiece of the combined gear; wherein the positioning tool comprises a fixed part and a movable part, the fixed part and the movable part both pass through opposite ends, one end of the fixed part is used to be fixed to the fixed position, and the movable part is rollingly fixed in the other end of the fixed part, and when the clamping mechanism clamps the shaft gear workpiece, the shaft gear workpiece extends into the movable part; S4. Performing gear hobbing of the gear workpiece; S5. Deburring and polishing of combined gears.

2. The method for processing a small-module combined gear according to claim 1, characterized in that: The fixed component includes an avoidance groove along the axial direction for making way for the end of the clamping mechanism and a rolling groove for rollingly setting the movable component. The avoidance groove is connected to the rolling groove, and the rolling groove wall and the outer wall of the movable component are matching spherical structures. The rolling groove wall is in direct contact with the outer wall of the movable component, and the end of the movable component extends out of the fixed component.

3. The method for processing a small-module combined gear according to claim 2, characterized in that: The width of the portion of the fixing component provided with the avoidance groove is greater than the width of the portion of the fixing component provided with the rolling groove, the width of the rolling groove is greater than the width of the end of the clamping mechanism, and the end of the fixing component away from the rolling groove is provided with a protrusion extending circumferentially outward, and the protrusion is provided with a fixing hole for fixing with the fastener of the fixing part.

4. The method for processing a small-module combined gear according to claim 2, characterized in that: A matching groove is respectively arranged on the groove walls on the opposite sides of the rolling groove, and the matching groove passes through the end surface of the fixing component. The distance between the groove walls of the two matching grooves is greater than or equal to the maximum inner diameter of the rolling groove.

5. The method for processing small-module combined gears according to claim 2, characterized in that: When the end face of the movable component is in contact with the end face of the gear workpiece, the distance between the inner wall of the movable component and the shaft gear workpiece is greater than the wall thickness of the movable component.

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