A machining process for hollow shafts of new energy motors

Abstract

This invention relates to the field of hollow shaft machining technology and discloses a machining process for hollow shafts of new energy motors. The process includes: S1, using a four-axis machining center to roughly position and clamp the hollow shaft part with the outer diameter of the forging blank; S2, rough drilling the hollow shaft part; S3, using a probe and a special probe, rotating the four-axis turntable to 8°, positioning the probe at the hole opening, orienting the spindle to a specific angle, and moving the probe along the X and Y axes in conjunction to enter the hole along an 8° oblique line; S4, returning the four-axis turntable to 0°, simultaneously moving the probe along the Y axis back to Y0, orienting the spindle to four specific angles to perform contact measurements on the inner hole wall, with measurement depths of -90° and -125°; S5, compensating the machining coordinate system based on the measured and calculated values ​​to correct coordinate deviations. Using this method, the probe can enter the cavity through the hole of the hollow shaft for measurement, effectively controlling the runout of the hollow shaft's inner hole to less than 0.1mm, thus meeting production requirements.

Description

Technical Field

[0001] This invention relates to the field of hollow shaft processing technology, specifically a processing technology for hollow shafts of new energy motors. Background Technology

[0002] The blanks for the motor shafts (hollow shafts) of new energy vehicles are typically formed by cold extrusion followed by rotary forging. The traditional machining process involves:

[0003] 1. Clamp the right side of the blank with a three-jaw chuck on the lathe, drill the left end hole, and turn the outer diameter and inner hole.

[0004] 2. Clamp the left end outer diameter on the lathe, drill the right end hole, and turn the outer diameter and inner hole.

[0005] 3. The outer diameter of the holes on both sides of the lathe double top is precision machined.

[0006] After the hollow shaft's internal cavity is forged, it is not finished. Forging can only guarantee a wall thickness difference range of 0-0.15mm. The lathe is positioned based on the shape of the forged blank, which cannot effectively control the internal hole runout. It is necessary to align the internal cavity and machine the chamfers at both ends of the hole to effectively ensure that the runout of the motor shaft's internal hole is less than 0.1mm. At the same time, the standard probe used for the measuring head cannot enter the cavity from the hole opening for measurement. Therefore, a new machining process for hollow shafts of new energy motors is proposed. Summary of the Invention

[0007] The purpose of this invention is to provide a machining process for hollow shafts of new energy motors, addressing the issues raised in the background art where, after forging the internal cavity of the hollow shaft, no finishing machining is performed. Forging can only guarantee a wall thickness difference range of 0-0.15mm, and the lathe, positioned based on the shape of the forged blank, cannot effectively control the internal hole runout. It is necessary to align the internal cavity and machine the chamfers at both ends of the hole to effectively ensure that the internal hole runout of the motor shaft is less than 0.1mm. Furthermore, the standard probe used for the measuring head cannot enter the cavity from the hole opening for measurement.

[0008] To achieve the above objectives, the present invention provides the following technical solution: a machining process for hollow shafts of new energy motors, comprising the following steps:

[0009] S1. Use a four-axis machining center to roughly position and clamp the hollow shaft part using the outer diameter of the forging blank.

[0010] S2. Rough drilling of hollow shaft parts;

[0011] S3. Using a probe and a special stylus, the four-axis turntable is rotated to 8°, the stylus is positioned at the hole opening, the spindle is oriented to a specific angle, and the stylus moves along the X and Y axes in conjunction, entering the hole along an 8° oblique line.

[0012] S4. The four-axis turntable returns to 0°, and the probe Y-axis returns to Y0 in linkage. The main spindle is oriented to four specific angles to perform touch measurement on the inner hole wall. The measurement depths are -90 and -125 respectively.

[0013] S5. Based on the measured and calculated values, compensate the machining coordinate system and correct coordinate deviations;

[0014] S6. The probe moves in the opposite direction to the direction it entered the inner hole and then exits the inner hole;

[0015] S7. Further machine the positioning surfaces of the two end holes;

[0016] S8, double top holes on both sides of the lathe, floating chuck clamps the outer circle, finish turning the outer circle;

[0017] S9, Lathe clamping outer circle, clamping position for machining operations.

[0018] As a further preferred embodiment of this technical solution: one end of the probe is provided with a curved part and a straight column part. One end of the curved part is fixedly connected to an end head. One end of the straight column part is fixedly connected to one end of a frustum. The other end of the frustum is fixedly connected to a fixing post. A through hole is opened on the outer side of the fixing post. A connecting post is fixedly connected to the end of the fixing post away from the frustum. A threaded post is fixedly connected to the end of the connecting post away from the fixing post.

[0019] As a further preferred embodiment of this technical solution, the distance between one end of the straight column and the center of the end is 130mm.

[0020] As a further preferred embodiment of this technical solution, the distance between the other end of the bent portion and one end of the end cap is 54mm.

[0021] As a further preferred embodiment of this technical solution, the diameter of the cross-sectional circle of the straight column is 5mm.

[0022] As a further preferred embodiment of this technical solution, the bending radius of the bent portion is 96.8 mm.

[0023] As a further preferred embodiment of this technical solution, the distance between the center of the straight column and the outer side of the end is 16.5 mm.

[0024] As a further preferred embodiment of this technical solution, the end is a sphere with a diameter of 6mm.

[0025] Compared with the prior art, the beneficial effects of the present invention are: using this technical method, the probe can enter the cavity through the hole of the hollow shaft for measurement, which can effectively control the runout of the hollow shaft inner hole to be less than 0.1mm, thereby meeting the production requirements. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the probe structure of the present invention;

[0028] Figure 2 This is a schematic diagram of the probe dimensions and structure of the present invention;

[0029] Figure 3 This is a schematic diagram of the probe action structure of the present invention;

[0030] Figure 4 This is a schematic diagram of the probe action two structure of the present invention;

[0031] Figure 5 This is a schematic diagram of the three-structure action of the probe of the present invention;

[0032] Figure 6 This is a schematic diagram of the probe action four structure of the present invention;

[0033] Figure 7 This is a schematic diagram of the probe action five structure of the present invention.

[0034] Explanation of reference numerals in the attached diagram: 1. Probe; 2. Bend; 3. Straight column; 4. End; 5. Frustum; 6. Fixed post; 7. Through hole; 8. Connecting post; 9. Threaded post. Detailed Implementation

[0035] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0036] It should be noted that the structures, proportions, sizes, etc., shown in the accompanying drawings of this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the conditions under which this application can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size should still fall within the scope of the technical content disclosed in this application, provided that they do not affect the effects and purposes that this application can produce.

[0037] Example

[0038] In existing technologies, the hollow shaft's internal cavity is forged but not finished. Forging can only guarantee a wall thickness difference of 0-0.15mm. The lathe is positioned based on the shape of the forged blank, which cannot effectively control the internal hole runout. The internal cavity must be aligned, and the openings at both ends must be chamfered to effectively ensure that the motor shaft's internal hole runout is less than 0.1mm. Furthermore, the standard probe used for the measuring head cannot enter the cavity through the opening for measurement.

[0039] Please see Figure 1-7 This invention provides a technical solution: a machining process for hollow shafts of new energy motors, comprising the following steps:

[0040] S1. Use a four-axis machining center to roughly position and clamp the hollow shaft part using the outer diameter of the forging blank.

[0041] S2. Rough drilling of hollow shaft parts;

[0042] S3. Using the probe with the special probe 1, the four-axis turntable is rotated to 8°, the probe 1 is positioned at the hole opening, the main shaft is oriented to a specific angle, the probe 1 moves along the XY axis and enters the hole along the 8° oblique line;

[0043] S4. The four-axis turntable returns to 0°, and at the same time, the probe 1Y axis returns to Y0. The main spindle is oriented to four specific angles to perform touch measurement on the inner hole wall. The measurement depths are -90 and -125 respectively.

[0044] S5. Based on the measured and calculated values, compensate the machining coordinate system and correct coordinate deviations;

[0045] S6. The probe 1 moves in the opposite direction to the direction it entered the inner hole and exits the inner hole;

[0046] S7. Further machine the positioning surfaces of the two end holes;

[0047] S8, double top holes on both sides of the lathe, floating chuck clamps the outer circle, finish turning the outer circle;

[0048] S9, Lathe clamping outer circle, clamping position for machining operations.

[0049] The probe 1 has a bent part 2 and a straight part 3 at one end. One end of the bent part 2 is fixedly connected to an end head 4. One end of the straight part 3 is fixedly connected to one end of a frustum 5. The other end of the frustum 5 is fixedly connected to a fixing post 6. A through hole 7 is opened on the outer side of the fixing post 6. A connecting post 8 is fixedly connected to the end of the fixing post 6 away from the frustum 5. A threaded post 9 is fixedly connected to the end of the connecting post 8 away from the fixing post 6. Using this technical method, the probe can enter the cavity through the hole of the hollow shaft for measurement, which can effectively control the runout of the hollow shaft inner hole to less than 0.1mm, thereby meeting the production requirements.

[0050] The distance between one end of the straight column 3 and the center of the end 4 is 130mm; the distance between the other end of the bent part 2 and one end of the end 4 is 54mm; the diameter of the cross-sectional circle of the straight column 3 is 5mm; the bending radius of the bent part 2 is 96.8mm; the distance between the center of the straight column 3 and the outer side of the end 4 is 16.5mm; the end 4 is a sphere with a diameter of 6mm.

[0051] The working principle or structural principle is as follows: When probe 1 is in use, the four-axis rotary table rotates to 8°, probe 1 is positioned at the hole opening, the spindle is oriented to a specific angle, and probe 1 enters the hole along the 8° oblique line with linkage of the X and Y axes. The four-axis rotary table returns to 0°, and at the same time, probe 1 returns to Y0 with linkage of the Y axis. The spindle is oriented to four specific angles respectively to perform contact measurement on the inner hole wall, with measurement depths of -90 and -125. The measurement program calculates the deviation of the center position of the upper and lower hole layers and the deviation of the four-axis angle. Based on the measured and calculated values, the machining coordinate system is compensated. Probe 1 moves in the reverse direction of entering the inner hole and exits the inner hole. Then, the hollow shaft part is machined by milling the plane, boring the inner hole, drilling and milling the chamfer, etc. Using this technology, the probe can enter the cavity through the hole opening of the hollow shaft for measurement, which can effectively control the runout of the hollow shaft inner hole to less than 0.1mm, thereby meeting the production requirements.

[0052] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A new energy motor hollow shaft processing technology, characterized in that, Includes the following steps: S1. Use a four-axis machining center to roughly position and clamp the hollow shaft part using the outer diameter of the forging blank. S2. Rough drilling of hollow shaft parts; S3. Using the probe and special probe (1), the four-axis turntable is rotated to 8°, the probe (1) is positioned at the hole opening, the main shaft is oriented to a specific angle, the probe (1) moves along the XY axis and enters the hole along the 8° oblique line; S4. The four-axis turntable returns to 0°, and at the same time the probe (1) returns to Y0 along the Y-axis. The main shaft is oriented to four specific angles to touch the inner hole wall for measurement. The measurement depths are -90 and -125 respectively. S5. Based on the measured and calculated values, compensate the machining coordinate system and correct coordinate deviations; S6. The probe (1) moves in the opposite direction to the direction of entering the inner hole and exits the inner hole; S7. Further machine the positioning surfaces of the two end holes; S8, double top holes on both sides of the lathe, floating chuck clamps the outer circle, finish turning the outer circle; S9, Lathe clamping outer circle, clamping position for machining operations; The probe (1) has a curved part (2) and a straight part (3) at one end. One end of the curved part (2) is fixedly connected to an end head (4). One end of the straight part (3) is fixedly connected to one end of a frustum (5). The other end of the frustum (5) is fixedly connected to a fixing post (6). A through hole (7) is opened on the outside of the fixing post (6). A connecting post (8) is fixedly connected to the end of the fixing post (6) away from the frustum (5). A threaded post (9) is fixedly connected to the end of the connecting post (8) away from the fixing post (6).

2. The new energy motor hollow shaft processing process according to claim 1, characterized in that: The distance between one end of the straight column (3) and the center of the end (4) is 130mm.

3. The new energy motor hollow shaft machining process according to claim 1, characterized in that: The distance between the other end of the curved portion (2) and one end of the end (4) is 54 mm.

4. The new energy motor hollow shaft machining process according to claim 1, characterized in that: The diameter of the cross-sectional circle of the straight column (3) is 5 mm.

5. The new energy motor hollow shaft machining process according to claim 1, characterized in that: The bending radius of the bent portion (2) is 96.8 mm.

6. The new energy motor hollow shaft machining process according to claim 1, characterized in that: The distance between the center of the straight column (3) and the outer side of the end (4) is 16.5 mm.

7. The new energy motor hollow shaft machining process according to claim 1, characterized in that: The end (4) is a sphere with a diameter of 6 mm.

Images