Method for ensuring coaxiality and perpendicularity through direct connection of five shaft heads and direct drive motor

Abstract

The invention belongs to the field of machining, and particularly relates to a method for guaranteeing coaxiality and perpendicularity through direct connection of five shaft heads and a direct drive motor. According to the technical scheme, the method comprises the following steps that (1) a positioning conical surface is machined at the shaft end of the direct-drive motor, and the angle of the positioning conical surface is 60 degrees + / -30 minutes; the root of the positioning conical surface extends to the annular flange, and the end face of the annular flange is provided with a positioning spigot. The positioning conical surface and the positioning spigot are processed in the same working procedure; finish turning of the mounting flange of the direct-drive motor and the shaft neck is completed in one-time clamping; (2) detecting the coaxiality on line by adopting a non-contact laser measuring instrument; the coaxiality error of the positioning spigot and the positioning conical surface is less than 0.002 mm; (3) a taper hole matched with the positioning conical surface is machined in the input end of the five-shaft head, and first repositioning is formed after the taper hole is matched with the positioning conical surface; and a five-shaft-head base matching surface is ground by a vertical grinding machine by taking a direct-drive motor shaft as a reference. Through the design of the integrated machining datum and the positioning structure, the assembly precision can be guaranteed in the machining stage.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of machining, and particularly relates to a method for guaranteeing coaxiality and perpendicularity by directly connecting a five-axis head and a direct drive motor. BACKGROUND

[0002] When a five-axis linkage machining center connects a five-axis head and a direct drive motor, the following problems exist: cumulative error caused by a shaft coupling transmission; difficulty in guaranteeing coaxiality requirements of less than 0.005 mm by split assembly; and poor repeatability of positioning accuracy depending on manual adjustment of perpendicularity. SUMMARY

[0003] The application provides a method for guaranteeing coaxiality and perpendicularity by directly connecting a five-axis head and a direct drive motor, which guarantees assembly accuracy in a machining stage by designing an integrated machining reference and positioning structure.

[0004] The technical scheme of the application is as follows:

[0005] A method for guaranteeing coaxiality and perpendicularity by directly connecting a five-axis head and a direct drive motor, comprising the following steps:

[0006] 1) a positioning cone surface is machined at an end of a shaft of the direct drive motor, the positioning cone surface has an angle of 60°±30'; the positioning cone surface extends to a ring flange at a root thereof, an end surface of the ring flange is provided with a positioning stop; the positioning cone surface and the positioning stop are machined in the same process; and the ring flange of the direct drive motor and the shaft neck are finished by precision turning in one clamping;

[0007] 2) a non-contact laser measuring instrument is used to detect coaxiality on line; coaxiality error between the positioning stop and the positioning cone surface is less than 0.002 mm;

[0008] 3) a taper hole matched with the positioning cone surface is machined at an input end of the five-axis head, the taper hole and the positioning cone surface form a first repositioning after cooperation; and a cooperation surface of a base of the five-axis head is ground by using a vertical grinding machine with the shaft of the direct drive motor as a reference.

[0009] Further, in the method for guaranteeing coaxiality and perpendicularity by directly connecting the five-axis head and the direct drive motor, the five-axis head and the shaft of the direct drive motor are connected through an elastic shaft coupling; a grid-shaped micro oil groove is arranged on an assembly contact surface of the five-axis head and the direct drive motor to compensate for thermal deformation; and the grid-shaped micro oil groove has a depth of 0.03-0.05 mm.

[0010] Further, in the method for guaranteeing coaxiality and perpendicularity by directly connecting the five-axis head and the direct drive motor, the positioning stop of the ring flange has a diameter tolerance of ±0.002 mm.

[0011] Further, in the method for guaranteeing coaxiality and perpendicularity by directly connecting the five-axis head and the direct drive motor, a machined surface has a roughness of Ra0.4 or less.

[0012] Furthermore, the method of ensuring coaxiality and perpendicularity by directly connecting the five-axis head to the direct drive motor involves performing a 48-hour aging treatment on the parts before precision machining to eliminate stress.

[0013] The beneficial effects of this invention are as follows: This invention enables the coaxiality of the five-axis head and the direct drive motor to reach 0.003mm, and the perpendicularity deviation to be <0.005mm / 300mm, which can reduce the assembly and adjustment time by more than 60%. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the five-axis head being directly connected to the direct drive motor. Detailed Implementation

[0015] like Figure 1 As shown, a method for ensuring coaxiality and perpendicularity by directly connecting a five-axis head to a direct-drive motor includes the following steps:

[0016] 1) A positioning cone surface is machined at the end of the shaft of the direct drive motor 2, with an angle of 60°±30'; the root of the positioning cone surface extends to the annular flange 5, and the end face of the annular flange 5 is provided with a positioning stop, the diameter tolerance of which is ±0.002mm; the positioning cone surface and the positioning stop are machined in the same process; the annular flange 5 and the journal of the direct drive motor 2 are precision machined in one clamping; the surface roughness of the machined surface is Ra0.4 or less; the parts are subjected to 48-hour aging treatment before precision machining to eliminate stress;

[0017] 2) Online coaxiality is measured using a non-contact laser measuring instrument; the coaxiality error between the positioning stop and the positioning cone surface is <0.002mm;

[0018] 3) A tapered hole matching the positioning tapered surface is machined at the input end of the five-axis head 1. The tapered hole and the positioning tapered surface form the first repositioning. The mating surface of the five-axis head base 4 is ground by a vertical grinder with the direct drive motor 2 axis as the reference. The five-axis head 1 and the direct drive motor 2 axis are connected by a flexible coupling 3. A grid-shaped micro-oil groove is set on the assembly contact surface of the five-axis head 1 and the direct drive motor 2 to compensate for thermal deformation. The grid-shaped micro-oil groove is 0.04mm deep.

Claims

1. A method for ensuring coaxiality and perpendicularity of a direct connection between a five-axis head and a direct drive motor, characterized in that, It comprises the following steps: 1) Machining a positioning taper surface at the end of the direct drive motor shaft, the angle of the positioning taper surface is 60°±30'; the root of the positioning taper surface extends to the annular flange, the end surface of the annular flange is provided with a positioning stop; the positioning taper surface and the positioning stop are machined in the same process; the annular flange of the direct drive motor and the shaft neck are finished in one clamping; 2) Using a non-contact laser measuring instrument to detect the coaxiality on line; the coaxiality error between the positioning stop and the positioning taper surface is less than 0.002mm; 3) Machining a taper hole matched with the positioning taper surface by the input end of the five-axis head, the taper hole and the positioning taper surface form a first repositioning after cooperation; the cooperation surface of the base of the five-axis head is ground by a vertical grinding machine with the direct drive motor shaft as the reference.

2. The method for guaranteeing coaxiality and perpendicularity of direct connection of a five-axis head and a direct drive motor according to claim 1, characterized in that, The five-axis head and the direct drive motor shaft are connected through an elastic coupling; the grid-shaped micro oil groove is arranged on the assembly contact surface of the five-axis head and the direct drive motor to compensate for thermal deformation; the depth of the grid-shaped micro oil groove is 0.03-0.05mm.

3. The method of claim 1, wherein the five-axis head and the direct drive motor are directly connected to guarantee coaxiality and perpendicularity. The diameter tolerance of the positioning stop of the annular flange is ±0.002mm.

4. The method of claim 1, wherein the five-axis head and the direct drive motor are directly connected to guarantee coaxiality and perpendicularity. The roughness of the machined surface is less than 0.4Ra.

5. The method of claim 1, wherein, 48 hours of aging treatment is carried out before the finishing of the part to eliminate stress.

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