CN114909404A

CN114909404A - Method for manufacturing machine shell with double-layer bearing positions

Info

Publication number: CN114909404A
Application number: CN202210629877.1A
Authority: CN
Inventors: 肖元粮; 叶浩平; 楼亚辉; 郭舒婷
Original assignee: Hengdian Group DMEGC Magnetics Co Ltd
Current assignee: Hengdian Group DMEGC Magnetics Co Ltd
Priority date: 2022-06-06
Filing date: 2022-06-06
Publication date: 2022-08-16

Abstract

The invention discloses a method for manufacturing a machine shell with double-layer bearing positions, which comprises the following steps of S1: stretching a plate with a shaft hole to form a bearing sleeve for mounting a bearing; s2: stretching the bearing sleeve to form a first bearing position and a second bearing position, wherein the inner diameter of the second bearing position is larger than that of the first bearing position; s3: and stretching the plate to form the peripheral wall of the shell arranged around the bearing sleeve. The manufacturing method is not limited by the total length of the bearing sleeve in the manufacturing process, so that the phenomenon of plate cracking in the manufacturing process is well avoided, and the manufacturing yield of the shell is improved.

Description

Method for manufacturing machine shell with double-layer bearing position

Technical Field

The invention relates to the technical field of motor manufacturing, in particular to a manufacturing method of a shell with double layers of bearing positions.

Background

In the existing housing, a plate with a shaft hole is usually stretched in the manufacturing process, and the outer peripheral wall of the housing is firstly formed and then the bearing mounting part is formed. The material of the inner bearing position is not easy to pull in the manufacturing process, the material flow is limited, and when a plurality of bearings need to be installed in the housing, the phenomenon that the plate is cracked easily occurs when the total height of the bearing installation part is larger.

Disclosure of Invention

The invention aims to provide a manufacturing method of a machine shell with double layers of bearing positions, which is not limited by the total length of a bearing sleeve in the manufacturing process, better avoids the phenomenon of plate cracking in the manufacturing process and improves the manufacturing yield of the machine shell.

In order to achieve the technical effects, the technical scheme of the invention is as follows:

the invention discloses a method for manufacturing a machine shell with double-layer bearing positions, which comprises the following steps:

s1: stretching a plate with a shaft hole to form a bearing sleeve for mounting a bearing;

s2: stretching the bearing sleeve to form a first bearing position and a second bearing position, wherein the inner diameter of the second bearing position is larger than that of the first bearing position;

s3: and stretching the plate to form a shell peripheral wall surrounding the bearing sleeve.

In some embodiments, the first bearing is positioned within a coaxiality error of no more than 0.05mm from the second bearing.

In some embodiments, the bearing sleeve has a coaxiality error of no more than 0.1mm with the outer peripheral wall of the housing.

In some embodiments, in step S1, the bearing sleeve is formed by performing multiple gradient stretches on the sheet material.

In some embodiments, in step S2, a downwardly concave tension groove is formed at the contact of the bearing sleeve with the horizontal plate while the first and second bearing locations are formed.

In some embodiments, in step S3, the plate material is subjected to multiple gradient stretching to form the outer peripheral wall of the casing.

In some embodiments, after step S3, the method further includes: s4: and stretching the part between the bearing sleeve and the outer peripheral wall of the shell to form a positioning convex hull.

In some specific embodiments, in step S4, the positioning convex hulls are multiple, and the positioning convex hulls are distributed at intervals along the circumferential direction of the bearing sleeve.

In some specific embodiments, after step S4, the method further includes: s5: and processing a positioning threaded hole on the positioning convex hull.

In some specific embodiments, in step S5, the positioning threaded hole is formed while a through hole is formed at a portion between the bearing sleeve and the outer peripheral wall of the housing, the through hole being located radially inward of the positioning boss.

The manufacturing method of the shell with the double-layer bearing position has the following beneficial effects: in the manufacturing process, a plate with a shaft hole is stretched to form a bearing sleeve for mounting a bearing, and after the first bearing position and the second bearing position are formed, the plate is stretched to form the outer peripheral wall of the shell arranged around the bearing sleeve. The material that can take place to warp at tensile bearing sleeve's in-process is whole panel, and this partial material is more, even if bearing sleeve's length is longer, the cracked phenomenon of bearing sleeve's lateral wall can not appear yet to the manufacturing yield of casing has been promoted. Meanwhile, the bearing sleeve is formed firstly, the peripheral wall of the shell is formed, and the bearing sleeve can be used for positioning and stretching to form the peripheral wall of the shell, so that the relative position degree of the bearing sleeve can be ensured, the coaxiality requirement of a product is improved, and the quality of the product is improved better.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

FIG. 1 is a schematic structural view of a housing having a double layer of bearing sites in accordance with the present invention;

FIG. 2 is a cross-sectional schematic view of a housing of the present invention having a double layer bearing position;

FIG. 3 is a simplified flow diagram of a method of manufacturing a housing having a double layer of bearing sites in accordance with the present invention;

FIG. 4 is a schematic illustration of the present invention in the manufacture of a housing having a double layer of bearing sites;

FIG. 5 is a detailed flow chart of a method of manufacturing a housing having dual layer bearing sites in accordance with an embodiment of the present invention;

fig. 6 is a detailed structural diagram of the housing with double-layer bearing sites in the manufacturing process according to the embodiment of the invention.

Reference numerals:

1. a plate material; 2. a bearing sleeve; 21. a first bearing position; 22. a second bearing position; 23. a drawing tank; 3. an outer peripheral wall of the casing; 4. positioning the convex hull; 41. positioning the threaded hole; 5. and a through hole.

Detailed Description

In order to make the technical problems solved, the technical solutions adopted and the technical effects achieved by the present invention clearer, the technical solutions of the present invention are further described below by way of specific embodiments with reference to the accompanying drawings.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.

Furthermore, features defined as "first" and "second" may explicitly or implicitly include one or more of the features for distinguishing between descriptive features, non-sequential, non-trivial and non-trivial. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in a specific case to those of ordinary skill in the art.

The following describes a flow of a manufacturing method of a housing with a double-layer bearing seat according to an embodiment of the present invention with reference to fig. 1 to 4.

The invention discloses a method for manufacturing a machine shell with double-layer bearing positions, which comprises the following steps of as shown in figures 3-4

S1: stretching a plate 1 with a shaft hole to form a bearing sleeve 2 for mounting a bearing;

s2: stretching the bearing sleeve 2 to form a first bearing position 21 and a second bearing position 22, wherein the inner diameter of the second bearing position 22 is larger than that of the first bearing position 21;

s3: the sheet 1 is stretched to form a housing peripheral wall 3 disposed around the bearing sleeve 2.

First, in the prior art, a plate is stretched to form a housing outer peripheral wall, and then a bearing sleeve is stretched in a plane perpendicular to the rear of the housing outer peripheral wall. Therefore, the material capable of deforming in the process of stretching the bearing sleeve is the material at the plane vertical to the back of the outer peripheral wall of the shell, the material of the part is very limited, and if the required bearing sleeve is too long, the side wall of the bearing sleeve is broken, so that the whole shell is scrapped.

It can be understood that, in the working flow of the manufacturing method of the housing with double-layer bearing positions of the present invention, the plate material 1 with the shaft hole is firstly stretched to form the bearing sleeve 2 for mounting the bearing, and after the first bearing position 21 and the second bearing position 22 are formed, the plate material 1 is stretched to form the housing outer circumferential wall 3 arranged around the bearing sleeve 2. The material that can take place to warp at tensile bearing sleeve 2 in-process like this is whole panel 1, and this partial material is more, even if bearing sleeve 2's length is longer, the cracked phenomenon of the lateral wall of bearing sleeve 2 can not appear to the manufacturing yield of casing has been promoted. Meanwhile, the bearing sleeve 2 is formed firstly, the shell peripheral wall 3 is formed, and the bearing sleeve 2 can be used for positioning and stretching to form the shell peripheral wall 3, so that the relative position degree can be ensured, the coaxiality requirement of a product is improved, and the quality of the product is improved better.

In addition, it should be added that the housing mentioned in the present invention may be a housing of a brushless fan motor, a housing of a motor of a household motor vehicle, a housing of a window motor, a housing of a motor of an electric power tool, and the like, and the purpose of the housing may be selected according to actual needs, and the specific type of the housing is not limited herein.

In some embodiments, the coaxiality error of the first bearing position 21 and the second bearing position 22 is not greater than 0.05 mm. It can be understood that two bearings used for mounting of the first bearing position 21 and the second bearing position 22 need to be arranged on the same rotating shaft, and if the coaxiality error between the first bearing position 21 and the second bearing position 22 is large, the rotating shaft can be mounted in a clamping manner, or the rotating shaft is easy to break in the rotating process. In this embodiment, the coaxiality error between the first bearing position 21 and the second bearing position 22 is controlled within 0.05mm during the manufacturing process, so that the phenomenon of jamming when the rotating shaft is mounted or fracture easily occurring during the rotating process of the rotating shaft can be well avoided. Of course, the coaxiality error value of the first bearing position 21 and the second bearing position 22 can be designed according to different drawing devices and dies in the actual processing process, and is not limited to be larger than 0.05mm in the embodiment.

In some embodiments, the bearing sleeve 2 is not coaxial with the housing peripheral wall 3 by more than 0.1 mm. It can be understood that too large coaxiality error between the bearing sleeve 2 and the outer peripheral wall 3 of the casing can cause the eccentricity of the casing and the rotating shaft in the installation process of the motor, so that the casing runs to jump, the jumping over-tolerance can cause the dynamic balance of a product to be unqualified, and the probability of fracture easily occurring in the rotating process of the rotating shaft can be improved. In this embodiment, with the axiality error control of bearing sleeve 2 and casing periphery wall 3 within 0.1mm, reduced the axis of rotation and rotated the cracked probability that appears in-process, promoted the use reliability of motor.

In some embodiments, in step S1, the bearing sleeve 2 is formed by performing multiple gradient stretching on the sheet material 1. It is understood that, in the actual drawing process, if the bearing sleeve 2 is formed at one time, the phenomena of poor precision and easy breakage of the sheet material 1 are easily caused. In this embodiment, the bearing sleeve 2 is formed by performing multiple gradient stretching on the plate 1, so that the tensile force of the plate 1 is divided into multiple times to be applied to the plate 1, the deformation of the plate 1 is small each time, on one hand, the final stretching precision can be ensured, the processing requirement can be met, and on the other hand, the phenomenon that the plate 1 is easily broken can be avoided.

In some embodiments, in step S2, a downwardly concave drawing groove 23 is formed at the contact of the bearing sleeve 2 with the horizontal plate while the first and

second bearing sites

21 and 22 are formed. It will be appreciated that the tension slot 23 is formed to facilitate later installation of the bearing.

In some embodiments, in step S3, the sheet material 1 is subjected to gradient drawing a plurality of times to form the casing peripheral wall 3. It is understood that, in the actual drawing process, if the case peripheral wall 3 is formed at one time, a phenomenon that the accuracy is poor and the sheet material 1 is easily broken is easily caused. In this embodiment, carry out many times gradient drawing to panel 1 and form casing periphery wall 3, divide into the pulling force to panel 1 like this and exert on panel 1 many times, the deflection of panel 1 every time is all less, can guarantee last tensile precision on the one hand, satisfies the processing requirement, and on the other hand can avoid the easy phenomenon emergence of breaking of panel 1.

In some embodiments, after step S3, the method further includes: s4: the portion between the bearing sleeve 2 and the outer peripheral wall 3 of the housing is stretched to form a positioning convex hull 4. It will be appreciated that the locating boss 4 is formed to facilitate subsequent installation and location.

In some specific embodiments, in step S4, the positioning convex hulls 4 are multiple, and the multiple positioning convex hulls 4 are distributed at intervals along the circumferential direction of the bearing sleeve 2. Therefore, the plurality of positioning convex hulls 4 can improve the positioning precision and the connection stability of the machine shell.

In some specific embodiments, after step S4, the method further includes: s5: a positioning threaded hole 41 is machined in the positioning convex hull 4. From this, only need adopt the screw to carry out the casing installation in the assembling process, easy to assemble has promoted packaging efficiency to be favorable to promoting the manufacturing efficiency of motor.

In some specific embodiments, in step S5, the positioning screw hole 41 is formed while the through hole 5 is formed at a portion between the bearing sleeve 2 and the housing outer peripheral wall 3 radially inside the positioning boss 4. It is understood that the through hole 5 can be used for positioning or mounting other components, and can be selected according to actual needs.

Example (b):

the following describes a flow of a method for manufacturing a housing with a double-layer bearing seat according to an embodiment of the present invention with reference to fig. 5 to 6.

As shown in fig. 5 to 6, the steps of the method for processing the casing with the double-layer bearing position of the present embodiment are as follows:

q1: stretching a plate 1 with a shaft hole to form a bearing sleeve 2 for mounting a bearing;

specifically, the plate material 1 is stretched four times to form the bearing sleeve 2, and the stretched diameter is gradually reduced and the height is gradually increased in the four-time stretching process.

Q2: the bearing sleeve 2 is stretched to form a first bearing position 21 and a second bearing position 22, the inner diameter of the second bearing position 22 is larger than that of the first bearing position 21, and a stretching groove 23 which is concave downwards is formed at the contact part of the bearing sleeve 2 and a horizontal plate.

Specifically, in the machining process, the bearing sleeve 2 is stretched twice, a stretching groove 23 which is recessed downwards is formed at the contact position of the bearing sleeve 2 and a horizontal plate in the first stretching, the bearing sleeve 2 is divided into two parts in the second stretching, one part is a first bearing position 21, the other part is a second bearing position 22, and the inner diameter of the second bearing position 22 is larger than that of the first bearing position 21.

Q3: the sheet material 1 is stretched to form a housing peripheral wall 3 disposed around the bearing sleeve 2.

Specifically, the plate material 1 is drawn twice to form the housing outer peripheral wall 3, and in the two-drawing process, the first drawing is to form a rough contour of the housing outer peripheral wall 3, and the second drawing is to correct the housing outer peripheral wall 3.

Q4: stretching the part between the bearing sleeve 2 and the outer peripheral wall 3 of the shell to form a positioning convex hull 4;

specifically, the portion between the bearing sleeve 2 and the housing outer peripheral wall 3 is stretched three times to form three positioning convex hulls 4 provided at intervals in the circumferential direction around the bearing sleeve 2

Q5: a positioning screw hole 41 is processed in the positioning boss 4, and a through hole 5 is formed in a portion between the bearing sleeve 2 and the housing outer peripheral wall 3, radially inside the positioning boss 4.

Specifically, the stretched blank is transferred to a drilling machine, a unthreaded hole is first machined in the positioning convex hull 4, a through hole 5 located on the radial inner side of the positioning convex hull 4 is machined in the portion between the bearing sleeve 2 and the outer peripheral wall 3 of the housing, and then the unthreaded hole is tapped to form the positioning threaded hole 41.

The manufacturing method of the casing with the double-layer bearing position has the following advantages:

firstly, the method comprises the following steps: the bearing sleeve 2 is formed firstly, and then the outer peripheral wall 3 of the shell is formed, so that the limitation of the total length of the bearing sleeve 2 is avoided in the stretching process, the cracking phenomenon of the plate 1 in the manufacturing process is avoided better, and the manufacturing yield of the shell is improved;

secondly, the method comprises the following steps: the wall thickness requirements of the first bearing position 21 and the second bearing position 22 of the shell can be well guaranteed, and the wall thickness is more uniform after shaping, so that the dynamic balance meets the requirements of customers;

thirdly, the method comprises the following steps: form bearing sleeve 2 earlier, form casing periphery wall 3 again, can fix a position with bearing sleeve 2, tensile in order to form casing periphery wall 3, can guarantee its relative position degree more like this to promote the requirement of the axiality of product, make the quality of product obtain better promotion.

In the description herein, references to the description of "some embodiments," "other embodiments," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above description is only a preferred embodiment of the present invention, and for those skilled in the art, the present invention should not be limited by the description of the present invention, which should be interpreted as a limitation.

Claims

1. A method of manufacturing a housing having a double layer of bearing sites, comprising:

s1: stretching a plate (1) with a shaft hole to form a bearing sleeve (2) for mounting a bearing;

s2: drawing the bearing sleeve (2) to form a first bearing position (21) and a second bearing position (22), wherein the inner diameter of the second bearing position (22) is larger than that of the first bearing position (21);

s3: and stretching the plate (1) to form a shell peripheral wall (3) surrounding the bearing sleeve (2).

2. The method for manufacturing a housing with a double-layer bearing location according to claim 1, wherein the error of coaxiality of the first bearing location (21) and the second bearing location (22) is not more than 0.05 mm.

3. The method of claim 1, wherein the error in the coaxiality of the bearing sleeve (2) and the outer peripheral wall (3) of the housing is not more than 0.1 mm.

4. A method for manufacturing a housing with a double layer bearing location according to any of claims 1-3, wherein in step S1, the bearing sleeve (2) is formed by performing multiple gradient stretching on the sheet material (1).

5. A method for manufacturing a housing with a double layer of bearing sites according to any of the claims 1-3, characterized in that in step S2, a downwardly concave drawing groove (23) is formed at the contact of the bearing sleeve (2) and a horizontal plate at the same time as the first bearing site (21) and the second bearing site (22) are formed.

6. The method for manufacturing a housing with a double-layer bearing seat according to any one of claims 1-3, wherein in step S3, the plate material (1) is subjected to multiple gradient stretching to form the housing peripheral wall (3).

7. The method for manufacturing a housing with a double-layer bearing seat according to any one of claims 1 to 3, further comprising, after step S3:

s4: and stretching the part between the bearing sleeve (2) and the outer peripheral wall (3) of the shell to form a positioning convex hull (4).

8. The method for manufacturing a housing with a double-layer bearing seat as claimed in claim 7, wherein in step S4, the positioning convex hulls (4) are multiple, and the positioning convex hulls (4) are distributed at intervals along the circumferential direction of the bearing sleeve (2).

9. The method for manufacturing a housing with a double-layer bearing seat according to claim 7, further comprising after step S4:

s5: and processing a positioning threaded hole (41) on the positioning convex hull (4).

10. The manufacturing method of a housing having a double-layered bearing bit according to claim 9, wherein in step S5, the positioning screw hole (41) is formed while a through hole (5) is formed at a portion between the bearing sleeve (2) and the housing outer peripheral wall (3) radially inside the positioning convex hull (4).