A multi-station automatic stretching method

Abstract

The invention provides a multi-station automatic stretching method, which belongs to the field of motor casing forming. It solves the problem of low forming efficiency of existing motor casings. The multi-station automatic stretching method completes the processing of the motor casing through six steps such as pre-stamping. The invention has the advantage of high forming efficiency.

Description

Technical Field

[0001] The invention belongs to the field of motor casing forming and relates to a multi-station automatic stretching method. Background Art

[0002] An electric motor is a device that converts electrical energy into mechanical energy. It converts electrical energy into mechanical energy, uses an energized coil to generate a rotating magnetic field and acts on the rotor to form a magneto-electrodynamic rotating torque. It mainly includes an electromagnet winding or a distributed stator winding for generating a magnetic field and a rotating armature or rotor. The rotor and stator are installed inside the motor casing.

[0003] The conventional motor casing manufacturing process consists of a punch press and a mold, which is completed in a single step on an ordinary punch press. One product has 12 processes to complete, and each process requires a punch press, a mold, and a worker. The labor cost is high and the product precision is poor. Summary of the invention

[0004] The purpose of the present invention is to provide a multi-station automatic stretching method to improve the molding efficiency in view of the above problems.

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

[0006] A multi-station automatic stretching method, characterized in that it comprises the following steps:

[0007] S1: Pre-punching the sheet through a punch press, and forming an upwardly convex outer arc surface at the center of the sheet after pre-punching;

[0008] S2: performing secondary stamping on the sheet formed in S1, after which the curved surface forms a flat top surface, and both sides of the top surface are bent downward to form side edges and edges;

[0009] S3: stamping the sheet material after stamping in step S2 for the third time. After the third stamping, the side edge and the edge are folded into a right angle, a downwardly concave angle is formed between the top surface and the side edge, and the center of the top surface has a downwardly concave inner arc surface;

[0010] S4: performing a fourth stamping on the sheet material after being stamped and formed in step S3. After the fourth stamping, the inner arc surface is depressed downward to form a concave plane, and the concave plane and the top surface are transitioned by an inclined plane.

[0011] S5: stamping the sheet material after stamping in step S4 for the fifth time. After the fifth stamping, the concave plane is raised upward to form a platform, and the inclined surface is bent between the platform and the top surface to form a downwardly concave inner groove;

[0012] S6: Punching the sheet material after being punched and formed in step S5, punching and forming the outer side along the edge and the platform, and forming an inner hole after punching at the center of the platform.

[0013] In the above-mentioned multi-station automatic stretching method, the curvature α of the outer curved surface in S1 is 115°-120°.

[0014] In the above-mentioned multi-station automatic stretching method, in S2, the top surface and the side edge are transitioned by a rounded corner, and the side edge and the edge are transitioned by a rounded corner;

[0015] In the above-mentioned multi-station automatic stretching method, the curvature β of the inner arc surface formed in S3 is 65°-70°.

[0016] In the above-mentioned multi-station automatic stretching method, the downwardly recessed angle formed between the top surface and the side edge in S3 is an arc angle.

[0017] In the above-mentioned multi-station automatic stretching method, the angle γ between the inclined surface and the concave plane in S4 is 110°-115°.

[0018] In the above-mentioned multi-station automatic stretching method, the cross-section of the inner groove formed in S5 is triangular.

[0019] In the above-mentioned multi-station automatic stretching method, the platform formed in S5 is flush with the top surface.

[0020] In the above-mentioned multi-station automatic stretching method, after the inner groove is formed in S5, the plate is extruded at the bottom of the inner groove to form a bottom plane.

[0021] In the above-mentioned multi-station automatic stretching method, the bottom plane and the platform are arranged parallel to each other.

[0022] Compared with the existing technology, the advantages of the present invention are: compared with the traditional stamping process, the product process is simplified and the molding efficiency is greatly improved.

[0023] Other advantages, objectives and features of the present invention will be embodied in part through the following description, and in part will be understood by those skilled in the art through study and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is the overall processing flow chart of the present invention.

[0025] Figure 2 It is a sheet forming diagram of process 1 of the present invention.

[0026] Figure 3 It is a sheet forming diagram of process 2 of the present invention.

[0027] Figure 4 It is a sheet forming diagram of process 3 of the present invention.

[0028] Figure 5 It is a sheet forming diagram of process 4 of the present invention.

[0029] Figure 6 It is a sheet forming diagram of step 5 of the present invention.

[0030] Figure 7 It is a sheet forming diagram of step 6 of the present invention.

[0031] In the figure, 1, outer arc surface; 2, top surface; 3, side; 4, edge; 5, inner arc surface; 6, concave plane; 7, inclined surface; 8, platform; 9, inner groove; 10, inner hole; 11, bottom plane. DETAILED DESCRIPTION

[0032] The present invention will be further described below in conjunction with the accompanying drawings.

[0033] like Figures 1 to 7 As shown, a multi-station automatic stretching method is characterized by comprising the following steps:

[0034] S1: The sheet is pre-punched by a punch press, and an upwardly convex outer arc surface 1 is formed at the center of the pre-punched sheet. The curvature α of the outer arc surface 1 is 115°-120°. The outer arc surface 1 is pre-processed to be between 115°-120°, so that the inside of the sheet can be fully extended, which is convenient for the subsequent bending of the sheet, and the strength of the sheet is better during the pressing process.

[0035] S2: The sheet formed in S1 is subjected to secondary stamping. After the secondary stamping, the curved surface forms a flat top surface 2, and both sides of the top surface 2 are bent downward to form side edges 3 and edge 4. Specifically, the top surface 2 and the side edges 3 are transitioned by rounded corners, and the side edges 3 and the edge 4 are transitioned by rounded corners, so that the connection between the top surface 2 and the side edges 3 and between the side edges 3 and the edge 4 is fully stretched, which is convenient for further processing.

[0036] S3: The sheet material that has been stamped and formed in step S2 is stamped for the third time. After the third stamping, the side edge 3 and the edge 4 are folded into a right angle, and a downwardly concave angle is formed between the top surface 2 and the side edge 3. Preferably, the downwardly concave angle is an arc angle. Pressing the fillet into a right angle and an angle on the basis of the original fillet can make the internal structure of the sheet material more compact and it is not easy to have cracks on the surface of the sheet material. There is a downwardly concave inner arc surface 5 at the center of the top surface 2, and the curvature β of the formed inner arc surface 5 is 65°-70°, so that the interior of the sheet material can be fully extended, which is convenient for the subsequent bending of the sheet material, and the strength of the sheet material is better during the pressing process.

[0037] S4: The sheet material formed by stamping in step S3 is stamped for the fourth time. After the fourth stamping, the inner arc surface 5 is recessed downward to form a concave plane 6, and the concave plane 6 and the top surface 2 are transitioned by the inclined surface 7; the inclined surface 7 is used for the forming of the platform 8. Pressing the inclined surface 7 in advance can play a transition role, so that the sheet material can be fully extended by using the inclined surface 7. In order to achieve a better forming effect of the platform 8, the angle γ between the inclined surface 7 and the concave plane 6 in S4 is 110°-115°.

[0038] S5: The sheet material formed by stamping in step S4 is stamped for the fifth time. After the fifth stamping, the concave plane 6 is raised upward to form a platform 8, and the inclined surface 7 is bent between the platform 8 and the top surface 2 to form a downwardly concave inner groove 9. Specifically, the cross-section of the inner groove 9 is a triangle.

[0039] S6: Punching the sheet material after being punched and formed in step S5, punching and forming the outer side of the edge 4 and the platform 8, and forming an inner hole 10 at the center of the platform 8 after punching.

[0040] The punch presses used in the above steps and the punching equipment used in the punching process are all hydraulic punch presses, which have improved stretching accuracy compared to traditional punch presses.

[0041] In this embodiment, in order to facilitate the forming of the platform 8 and maintain the connection strength of the plate, the platform 8 formed in S5 is flush with the top surface 2, and after the inner groove 9 is formed, the plate is located at the bottom position of the inner groove 9 and is extruded to form a bottom plane 11. Preferably, the bottom plane 11 and the platform 8 are arranged parallel to each other.

[0042] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

[0043] Although the terms such as outer arc surface 1, top surface 2, side edge 3, edge 4, inner arc surface 5, concave plane 6, inclined surface 7, platform 8, inner groove 9, inner hole 10, bottom plane 11 are often used in this article, the possibility of using other terms is not excluded. The use of these terms is only for more convenient description and explanation of the essence of the present invention. It is contrary to the spirit of the present invention to interpret them as any additional limitation.

Claims

1. A multi-station automatic stretching method, characterized in that: The following steps are involved: S1: Pre-punching the sheet through a punch press, and forming an upwardly convex outer arc surface at the center of the sheet after pre-punching; S2: performing secondary stamping on the sheet formed in S1, after which the curved surface forms a flat top surface, and both sides of the top surface are bent downward to form side edges and edges; S3: stamping the sheet material after stamping in step S2 for the third time. After the third stamping, the side edge and the edge are folded into a right angle, a downwardly concave angle is formed between the top surface and the side edge, and the center of the top surface has a downwardly concave inner arc surface; S4: performing a fourth stamping on the sheet material after being stamped and formed in step S3. After the fourth stamping, the inner arc surface is depressed downward to form a concave plane, and the concave plane and the top surface are transitioned by an inclined plane. S5: stamping the sheet material after stamping in step S4 for the fifth time. After the fifth stamping, the concave plane is raised upward to form a platform, and the inclined surface is bent between the platform and the top surface to form a downwardly concave inner groove; S6: Punching the sheet material after being punched and formed in step S5, punching and forming the outer side along the edge and the platform, and forming an inner hole after punching at the center of the platform.

2. A multi-station automatic stretching method according to claim 1, characterized in that: The curvature α of the outer curved surface in S1 is 115°-120°.

3. A multi-station automatic stretching method according to claim 1, characterized in that: In S2, the top surface and the side edge are transitioned by rounded corners, and the side edge and the edge are transitioned by rounded corners.

4. A multi-station automatic stretching method according to claim 1, characterized in that: The curvature β of the inner arc surface formed in S3 is 65°-70°.

5. A multi-station automatic stretching method according to claim 1, characterized in that: The downwardly recessed angle formed between the top surface and the side edge in S3 is an arc angle.

6. A multi-station automatic stretching method according to claim 1, characterized in that: The angle γ between the inclined surface and the concave plane in S4 is 110°-115°.

7. A multi-station automatic stretching method according to claim 1, characterized in that: The cross section of the inner groove formed in S5 is triangular.

8. A multi-station automatic stretching method according to claim 1, characterized in that: The platform formed in the S5 is flush with the top surface.

9. A multi-station automatic stretching method according to claim 1, characterized in that: After the inner groove is formed in S5, the plate is extruded at the bottom of the inner groove to form a bottom plane.

10. A multi-station automatic stretching method according to claim 8, characterized in that: The bottom plane and the platform are arranged parallel to each other.

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