CN116351943B - Double-layer stacking forming process for bearing chamber of motor housing - Google Patents
Double-layer stacking forming process for bearing chamber of motor housing Download PDFInfo
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- CN116351943B CN116351943B CN202310601038.3A CN202310601038A CN116351943B CN 116351943 B CN116351943 B CN 116351943B CN 202310601038 A CN202310601038 A CN 202310601038A CN 116351943 B CN116351943 B CN 116351943B
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- 238000000034 method Methods 0.000 title claims abstract description 38
- 239000011265 semifinished product Substances 0.000 claims abstract description 53
- 239000000463 material Substances 0.000 claims abstract description 36
- 239000002994 raw material Substances 0.000 claims abstract description 18
- 238000007493 shaping process Methods 0.000 claims abstract description 12
- 238000003475 lamination Methods 0.000 claims description 19
- 238000003825 pressing Methods 0.000 claims description 7
- 238000000465 moulding Methods 0.000 abstract description 13
- 238000005336 cracking Methods 0.000 abstract description 6
- 238000005452 bending Methods 0.000 abstract description 5
- 239000000047 product Substances 0.000 description 18
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 3
- 238000001125 extrusion Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 239000011701 zinc Substances 0.000 description 2
- 229910052725 zinc Inorganic materials 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000012778 molding material Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
- B21D22/20—Deep-drawing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D53/00—Making other particular articles
- B21D53/10—Making other particular articles parts of bearings; sleeves; valve seats or the like
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/64—Electric machine technologies in electromobility
Abstract
The invention provides a double-layer stacking forming process for a bearing chamber of a motor shell, which belongs to the technical field of forming processes and comprises the following steps: step 10), stretching and forming the raw material sheet to obtain a first semi-finished shell; the top end of the first semi-finished product shell is provided with a stacking cavity which is sunken towards the inner cavity of the shell; step 20), stretching a bottom shell of a stacking cavity of the first semi-finished product shell towards the opening direction of the stacking cavity to form a stacking part and a bearing chamber, so as to obtain a second semi-finished product shell; a gap is formed between the double-layer shells of the stacking part of the second semi-finished shell in the radial direction; step 30), reducing the gap between the double-layer shells of the stacking part of the second semi-finished product shell, so that the double-layer shells are attached to each other, and a third semi-finished product shell is obtained; step 40) shaping the third semi-finished shell to obtain the finished shell meeting the preset requirements. The double-layer stacking molding process for the bearing chamber of the motor shell reduces bending deformation of materials and avoids cracking.
Description
Technical Field
The invention belongs to the technical field of molding processes, and particularly relates to a double-layer stacking molding process for a bearing chamber of a motor housing.
Background
The bearing chamber of the motor housing is thinned due to the fact that the bearing chamber is stretched for a plurality of times. In order to meet the requirement of motor torque, thicker plates are required to be adopted for stamping to meet the requirement of bearing chamber wall thickness, so that the requirement of motor torque is ensured to be met. The thick plate material is selected to increase the material cost of the product, increase the weight of the motor and can not realize the production requirement of motor light weight. Moreover, the existing bearing chamber stacking process adopts one-step forming, so that stable flow of materials cannot be ensured, uneven thickness of a stacked part of the bearing chamber is caused, and the inner diameter size precision of the bearing chamber and the coaxiality precision of the bearing chamber and a shell cavity are affected. Meanwhile, as the material stacking part of the bearing chamber is formed and stacked in one step, the deformation of the material is accelerated, cracking occurs at the material stacking part, zinc scraps are accumulated at the bottom of the bearing chamber, and cannot be removed effectively in the cleaning process, and the material cannot be cleaned manually for the second time.
Disclosure of Invention
The technical problems to be solved by the invention are as follows: the double-layer stacking forming process for the bearing chamber of the motor shell reduces bending deformation of materials and avoids cracking.
In order to solve the technical problems, the embodiment of the invention provides a double-layer stacking and forming process for a bearing chamber of a motor shell, which comprises the following steps:
step 10), stretching and forming the raw material sheet to obtain a first semi-finished shell; the first semi-finished product shell is cylindrical, the top end of the first semi-finished product shell is closed, and the top end of the first semi-finished product shell is provided with a stacking cavity which is sunken towards the inner cavity of the shell; the error between the inner diameter of the first semi-finished shell and the inner diameter of the preset shell is within a preset error range;
step 20), stretching a bottom shell of a stacking cavity of the first semi-finished product shell towards an opening direction of the stacking cavity, so that side wall shells of the stacking cavity are overlapped in the radial direction to form a stacking part and a bearing chamber, and obtaining a second semi-finished product shell; a gap is formed between the double-layer shells of the stacking part of the second semi-finished shell in the radial direction;
step 30), reducing the gap between the double-layer shells of the stacking part of the second semi-finished product shell, so that the double-layer shells are attached to each other, and a third semi-finished product shell is obtained;
step 40) shaping the third semi-finished shell to obtain the finished shell meeting the preset requirements.
As a further improvement of the embodiment of the present invention, an error between the inner diameter of the bearing chamber of the second semi-finished product housing and the inner diameter of the preset bearing chamber is within a preset error range;
the step 30) specifically includes:
and inserting a bearing chamber male die with the outer diameter being the inner diameter of a preset bearing chamber into the bearing chamber of the second semi-finished product shell, extruding the outer shell of the material stacking part, and enabling the outer shell to be attached to the inner shell, so that the inner diameter of the bearing chamber is unchanged, the outer diameter of the bearing chamber is reduced, and the third semi-finished product shell is obtained.
As a further improvement of the embodiment of the present invention, the inner diameter of the bearing chamber of the second semi-finished product housing is larger than the inner diameter of the preset bearing chamber;
the step 30) specifically includes:
and inserting a bearing chamber male die with the outer diameter being the inner diameter of a preset bearing chamber into the bearing chamber of the second semi-finished product shell, and extruding an outer shell of the material stacking part of the second semi-finished product shell to enable the outer shell to be attached to the inner shell, so that the inner diameter of the bearing chamber and the outer diameter of the bearing chamber are reduced, and a third semi-finished product shell is obtained.
As a further improvement of the embodiment of the present invention, in the step 40), the third semi-finished casing is extruded by using the adapted upper die assembly and lower die assembly through pressure, and the third semi-finished casing is shaped, so as to obtain a finished casing meeting the preset requirements.
As a further improvement of the embodiment of the present invention, the step 40) specifically includes:
the third semi-finished product shell is placed on a stripper plate, the upper die assembly is pressed down, and a counter-pressure rod is used for applying pressure on a jacking rod, so that a lower die cylinder moves downwards; the upper die assembly pushes the third semi-finished product shell and the stripper plate to move downwards, so that the third semi-finished product shell smoothly enters the lower die assembly; the upper die assembly continues to be pressed down until the upper die assembly is matched with the lower die assembly, and the third semi-finished shell is shaped to meet the preset requirement, so that a finished shell is obtained;
the upper die assembly moves upwards and is separated from the lower die assembly, the lower die cylinder moves upwards, and the ejector rod is used for driving the stripper plate and the finished product shell to move upwards, so that the finished product shell is separated from the lower die assembly; the upper die assembly continues to move upwards, and after the finished product shell is separated from the stripper plate, the upper die assembly separates the finished product shell from the upper die assembly by utilizing elasticity, and the finished product shell falls onto the stripper plate.
As a further improvement of the embodiment of the present invention, in the step 20), a gap width between the double-layered shells of the stacking portion of the second semi-finished product casing in the radial direction is 0.8 to 1.2mm.
As a further improvement of the embodiment of the present invention, the step 10) includes:
step 101), stretching and forming the raw material sheet to form an original shell; the original shell comprises a cylindrical shell, a round table-shaped shell and a flat plate-shaped shell which are sequentially connected from bottom to top, wherein the taper of the round table-shaped shell is 90-110 degrees;
step 102) stretching the flat plate-shaped shell of the original shell towards the direction of the cylindrical shell, so that the round table-shaped shell forms the top end surface of the cylindrical shell, and a stacking cavity recessed towards the inner cavity is formed at the top end of the cylindrical shell, so that a first semi-finished shell is obtained.
As a further improvement of the embodiment of the present invention, in the step 101), the raw material sheet is subjected to stretch forming at least twice.
As a further improvement of the embodiment of the present invention, in the step 101), each stretch forming is performed by using a different forming die.
As a further improvement of the embodiment of the present invention, in the step 20), the stacking cavity of the first semi-finished product shell is pressed by using a stacking forming mold, so that the sidewall shells of the stacking cavity are stacked in a radial direction to form a stacking portion and a bearing chamber, and a second semi-finished product shell is obtained.
Compared with the prior art, the technical scheme of the invention has the following beneficial effects:
according to the double-layer stacking forming process for the motor shell bearing chamber, raw material sheets are stretched to obtain a first semi-finished shell with an upward stacking cavity, and the inner diameter of the first semi-finished shell meets preset requirements; stretching the bottom shell of the stacking cavity towards the opening direction of the stacking cavity, so that the side wall shells of the stacking cavity are overlapped in the radial direction to form a bearing chamber, and a second semi-finished product shell is obtained; and finally, adjusting the outer diameter and the inner diameter of the bearing chamber of the second semi-finished product shell to ensure that the inner diameter and the outer diameter of the bearing chamber meet preset requirements, and obtaining the finished product shell.
When the radial double-layer material is formed into the bearing chamber by the first semi-finished shell, gaps are formed between the double-layer shells of the material stacking part in the radial direction instead of direct bonding, then the double-layer shells of the material stacking part are further bonded, material stacking is realized by twice forming, bending deformation of materials is reduced, rounded angle superposition is ensured, the materials flow more stably in forming, and cracking phenomenon is avoided.
The method of the embodiment of the invention firstly enables the inner diameter of the shell to meet the preset requirement, then adjusts the inner diameter and the outer diameter of the bearing chamber to meet the preset requirement, improves the inner diameter precision of the bearing chamber, improves the coaxiality of the control bearing chamber and the inner diameter of the shell, and improves the performance of the motor after assembly.
The method provided by the embodiment of the invention is used for obtaining the finished shell through multiple stretching molding, so that the material flows more stably in the molding process, the thickness reduction rate of the shell wall thickness is reduced, the thickness requirement on the raw material sheet is reduced, the raw material is saved, and the cost is reduced.
Drawings
FIG. 1 is a flow chart of a double-layer stacking molding process of a bearing chamber of a motor housing according to an embodiment of the invention;
FIG. 2 is a schematic diagram of an original chassis according to the method of the present invention;
FIG. 3 is a schematic view of a first semi-finished housing according to an embodiment of the present invention;
FIG. 4 is a schematic view of a second semi-manufactured chassis according to the method of the present invention;
FIG. 5 is a schematic view of a third semi-manufactured chassis according to the method of the present invention;
FIG. 6 is a schematic view of a finished chassis according to an embodiment of the present invention;
FIG. 7 is a diagram showing a closed-mode state in the shaping step in the method according to the embodiment of the present invention.
The drawings are as follows: the raw shell 1, the flat plate-shaped shell 11, the round table-shaped shell 12, the cylindrical shell 13, the first semi-finished shell 2, the stacking cavity 22, the second semi-finished shell 3, the bearing chamber 32, the stacking part 33, the third semi-finished shell 4, the finished shell 5, the stripper plate 604, the lower die cylinder 610, the back pressure rod 611, the ejection rod 612, the upper die pushing block 614, the shaping punch 615 and the bearing chamber punch 616.
Detailed Description
The technical scheme of the invention is described in detail below with reference to the accompanying drawings.
The embodiment of the invention provides a double-layer stacking and forming process for a bearing chamber of a motor shell, which is shown in fig. 1 and comprises the following steps:
step 10) stretching and forming the raw material sheet to obtain the first semi-finished shell 2. As shown in fig. 3, the first semi-finished casing is cylindrical, and the top end is closed, and the top end of the first semi-finished casing 2 is provided with a stacking cavity 22 recessed towards the inner cavity of the casing. The error between the inner diameter of the first semi-finished shell and the inner diameter of the preset shell is within a preset error range. Wherein, the raw material sheet can be round, elliptic or rectangular, preferably round, so that the drawing is convenient to form a cylindrical shell, the material flow is facilitated, and the thinning condition of the material in the drawing process is reduced.
Step 20) stretching the bottom shell of the stacking cavity 22 of the first semi-finished shell towards the opening direction of the stacking cavity, so that the side wall shells of the stacking cavity 22 are overlapped in the radial direction to form a bearing chamber 32, and obtaining the second semi-finished shell 3, as shown in fig. 4. A gap is provided between the double-layered shells of the stack 33 of the second semi-finished casing in the radial direction.
The outer wall of the bearing chamber 32 is the outer shell wall of the stacking portion 33, and the inner wall of the bearing chamber 32 is the inner shell wall of the stacking portion 33. Half of the difference between the outer diameter and the inner diameter of the bearing chamber 32 is the sum of the double-layer casing thickness of the lamination portion and the gap between the double-layer casings. Preferably, the gap width between the double-layer shells of the stacking part of the second semi-finished shell in the radial direction is 0.8-1.2 mm. For example, the gap width in the radial direction between the double-layered shells of the stack portion of the second semi-finished casing is 0.8 mm, 0.9 mm, 1.0mm, 1.1 mm or 1.2mm. The gap in the width range is formed between the double-layer shells of the material stacking part, so that the bearing chamber is prevented from cracking when the material is stacked due to large bending deformation of the material, multiple shaping procedures are not needed, and the forming precision of the bearing chamber is affected by multiple extrusion of the material.
Step 30) reducing the gap between the double-layered shells of the stacking portion 33 of the second semi-finished shell, so that the double-layered shells are attached to each other, thereby obtaining a third semi-finished shell 4, as shown in fig. 5.
Step 40) shaping the third semi-finished casing 4 to obtain a finished casing 5 meeting the preset requirements, as shown in fig. 6.
According to the method, when the first semi-finished shell 2 is subjected to radial double lamination to form the bearing chamber 32, a gap is formed between the double-layer shells of the lamination part 33 in the radial direction instead of direct lamination, then the double-layer shells of the lamination part are further laminated, lamination is realized by twice molding, bending deformation of materials is reduced, rounded corner lamination is guaranteed, namely, the outer wall of the joint of the double-layer shells of the lamination part forms a larger circular arc, so that the materials flow more stably in molding, and cracking phenomenon is avoided. According to the method provided by the embodiment of the invention, the inner diameter of the shell meets the preset requirement before stacking, and the inner diameter and the outer diameter of the bearing chamber are adjusted after stacking so as to meet the preset requirement, so that the inner diameter precision of the bearing chamber is improved, the coaxiality of the bearing chamber and the inner diameter of the shell is improved, and the performance of the motor after assembly is improved. The method provided by the embodiment of the invention is used for obtaining the finished shell through multiple stretching molding, so that the material flows more stably in the molding process, the thickness reduction rate of the shell wall thickness is reduced, the thickness requirement on the raw material sheet is reduced, the raw material is saved, and the cost is reduced.
Preferably, in step 20), the stacking cavity 22 of the first semi-finished shell is pressed by pressure using a stacking forming mold, so that the sidewall shells of the stacking cavity are stacked in the radial direction to form the stacking portion 33 and the bearing chamber 32, thereby obtaining the second semi-finished shell 3.
As a preferred example, in step 20), during the lamination forming, an error between the inner diameter of the bearing chamber 32 of the second semi-finished product housing and the inner diameter of the preset bearing chamber is made to be within a preset error range, that is, the inner diameter of the bearing chamber of the second semi-finished product meets the preset requirement.
It should be noted that, the preset requirement herein is a requirement to be achieved by the finished casing, and the preset bearing chamber inner diameter is an inner diameter to be achieved by the bearing chamber of the finished casing.
Step 30) specifically includes:
a mandrel having an outer diameter of a predetermined inner diameter of the bearing chamber is inserted into the bearing chamber 32 of the second semi-finished product housing, and the outer shell of the stacked portion is pressed so that the outer shell is bonded to the inner shell, thereby maintaining the inner diameter of the bearing chamber unchanged, while the outer diameter of the bearing chamber is reduced, to obtain the third semi-finished product housing 4.
In the above embodiment, when the bearing chamber is formed by stacking materials, the inner diameter of the bearing chamber 32 meets the preset requirement, the inner diameter of the casing and the outer diameter of the bearing chamber are kept unchanged, the outer shell of the stacking portion is pressed inwards, the outer shell is attached to the inner shell, the outer diameter of the bearing chamber 32 is reduced to be close to the preset requirement, and finally, the outer diameter of the bearing chamber is adjusted by reshaping to meet the preset requirement. The embodiment ensures that the inner diameter of the shell meets the preset requirement, then ensures that the inner diameter of the bearing chamber meets the requirement, and finally ensures that the outer diameter of the bearing chamber meets the requirement, so that the inner diameter of the shell, the inner diameter of the bearing chamber and the outer diameter of the bearing chamber meet the preset requirement gradually in sequence, the control precision is convenient, the inner diameter precision of the bearing chamber is further improved, and the coaxiality of the bearing chamber and the inner diameter of the shell is improved.
As another preferred example, in step 20), the bearing chamber 32 of the second semi-finished shell is made to have an inner diameter larger than the predetermined bearing chamber inner diameter when the bearing chamber is formed by lamination.
Step 30) specifically includes:
the mandrel having an outer diameter of a predetermined inner diameter of the bearing chamber is inserted into the bearing chamber 32 of the second semi-finished product housing, and the outer shell of the stacked portion is pressed so that the outer shell is bonded to the inner shell, whereby both the inner diameter of the bearing chamber and the outer diameter of the bearing chamber are reduced, resulting in the third semi-finished product housing 4.
In the above embodiment, when the bearing chamber is formed by stacking materials, the inner diameter of the bearing chamber 32 is made to be slightly larger than the preset inner diameter of the bearing chamber, then when the outer layer shell and the inner layer shell are bonded by extruding the stacking material part, the outer diameter and the inner diameter of the bearing chamber 32 are reduced to be close to the preset requirements, and finally, the outer diameter and the inner diameter of the bearing chamber are adjusted by shaping to meet the preset requirements. In the embodiment, the inner diameter of the bearing chamber is firstly made to be larger and then shaped to be smaller to the required size of the product, and the inner diameter of the bearing chamber is firstly made to be about 0.02mm larger than the inner diameter of the preset bearing chamber, so that the core rod in the shaping procedure can be ensured to smoothly enter the bearing chamber, and zinc scraps can not be generated. If the bearing chamber inner diameter is consistent with the core rod outer diameter, zinc dust is generated by extrusion when the core rod enters the bearing chamber.
In step 40), the third semi-finished shell is extruded by pressure by using the upper die assembly and the lower die assembly, and the inner diameter and the outer diameter of the bearing chamber of the third semi-finished shell are adjusted at the same time, so as to obtain the finished shell meeting the preset requirements.
Further preferably, step 40) specifically includes:
the third semi-finished product shell is placed on a stripper plate, the upper die assembly is pressed down, and a counter-pressure rod is used for applying pressure on a jacking rod, so that a lower die cylinder moves downwards; the upper die assembly pushes the third semi-finished product shell and the stripper plate to move downwards, so that the third semi-finished product shell smoothly enters the lower die assembly; and the upper die assembly continues to be pressed down until the upper die assembly is matched with the lower die assembly, and the third semi-finished shell is shaped to a preset size to obtain the finished shell. The upper die assembly moves upwards and is separated from the lower die assembly, the lower die cylinder moves upwards, and the ejector rod is used for driving the stripper plate and the finished product shell to move upwards, so that the finished product shell is separated from the lower die assembly; the upper die assembly continues to move upwards, and after the finished product shell is separated from the stripper plate, the upper die assembly separates the finished product shell from the upper die assembly by utilizing elasticity, and the finished product shell falls onto the stripper plate.
Specifically, with the die apparatus shown in fig. 7, the punch press, the upper die assembly, the stripper 604, the lower die assembly and the lower die cylinder 610 are sequentially included from top to bottom, the upper die assembly is mounted on the punch press, the upper die assembly includes an upper die push block 614 and a counter-pressure bar 611, and the lower die assembly includes a shaping punch 615, a bearing chamber punch 616 and a ejector bar 612. The ejector rod 612 is connected with the lower die cylinder 610, the stripper plate can move up and down, and a through hole for the shaping punch 615 and the bearing chamber punch 616 to pass through is formed in the middle.
When the mold is closed, the manipulator conveys the third semi-finished product shell to the stripper plate 604, the punch descends, the counter-pressure rod 611 is used for applying pressure to push the ejector rod 612, the lower mold cylinder 610 moves downwards, and the stripper plate 604 carries the third semi-finished product shell to move downwards along with the lower mold cylinder 610. The upper die pushing block 614 contacts the top of the third semi-finished product shell, and in the continuous pressing process of the punch, the upper die pushing block 614 pushes the third semi-finished product shell and the stripper plate 604 to move downwards, so that the third semi-finished product shell is smoothly sleeved on the shaping punch 615, and the bearing chamber is sleeved on the bearing chamber male die 616, thereby ensuring that the product cannot deform and the size is more stable. The punch continues to descend, the upper die assembly continues to press down and is matched with the lower die assembly, and the third semi-finished shell is shaped to the required size, so that the finished shell is obtained.
When the die is opened, the punch is lifted, and the upper die assembly moves upwards to be separated from the lower die assembly. The lower die cylinder 610 moves upward and the stripper plate 604 and finished shell are pushed upward by the ejector rod 612, causing the finished shell to be ejected from the truing punch 615 and bearing chamber punch 616. The punch continues to rise, and the upper die assembly drives the finished product shell to move upwards, and after the finished product shell is separated from the stripper plate 604, the upper die pushing block 614 is used for separating the finished product shell from the upper die assembly while receiving reverse spring pressure, so that the finished product shell falls onto the stripper plate 604, and is convenient for a manipulator to clamp and transport to a lower station.
In this embodiment, the counter-pressure rod 611 and the ejector rod 612 are provided, and before the mold is closed, the counter-pressure rod 611 applies pressure on the ejector rod 612, so that the lower mold cylinder 610 moves down, and the third semi-finished machine shell is ensured to smoothly enter the lower mold assembly. After the mold is opened, the lower mold cylinder 610 moves upwards, and the third semi-finished product shell is pushed to move upwards by the ejector rod 612 so as to be smoothly separated from the lower mold assembly.
As a preferred example, step 10) includes:
step 101) stretching and forming the raw material sheet to form the original shell 1. As shown in fig. 2, the original housing 1 includes a cylindrical housing 13, a truncated cone-shaped housing 12, and a flat housing 11, which are sequentially connected from bottom to top, and the taper of the truncated cone-shaped housing is 90 ° to 110 °. For example, the taper of the frustoconical shell is 90 °, 96 °, 105 °, or 110 °.
Step 102) stretching the flat plate-shaped shell of the original shell 1 towards the direction of the cylindrical shell, so that the round table-shaped shell forms the top end surface of the cylindrical shell, and a stacking cavity 22 recessed into the inner cavity is formed at the top end of the cylindrical shell, thereby obtaining the first semi-finished shell 2.
Preferably, in step 101), the raw material sheet is subjected to stretch forming at least twice. And extrusion molding is carried out by using different molding dies respectively for each stretching molding.
In this embodiment, the raw material sheet is stretched and formed at least twice to form the original casing 1, and then the original casing 1 is stretched and formed to form the first semi-finished casing 2 with the stacking cavity. The cylindrical shell 11 of the original shell 1 is kept unchanged, the round table-shaped shell 12 forms a top end surface of the cylindrical shell partially, a side wall of the stacking cavity 22 partially is formed, the flat plate-shaped shell 11 forms a side wall of the stacking cavity 22 partially, and a cavity bottom of the stacking cavity 22 partially is formed. When the original shell 1 is formed, by controlling the distance between the flat plate-shaped shell 11 and the top end of the cylindrical shell, a material stacking cavity with a preset volume can be formed when the first semi-finished shell is formed, and the forming accuracy in the subsequent steps is improved. In this embodiment, the raw material sheet is stretched and molded for multiple times to obtain the original casing shown in fig. 2, and compared with the original casing in which the one-time molding material is easily thinned or broken in stretching, the multiple stretching in this embodiment can ensure the uniformity of the wall thickness and the molding effect of the casing.
The foregoing is merely illustrative of the present invention, and the present invention is not limited thereto, and any changes or substitutions easily contemplated by those skilled in the art within the scope of the present invention should be included in the present invention.
Claims (9)
1. The double-layer stacking and forming process for the bearing chamber of the motor shell is characterized by comprising the following steps of:
step 10), stretching and forming the raw material sheet to obtain a first semi-finished shell (2); the first semi-finished machine shell (2) is cylindrical, the top end of the first semi-finished machine shell is closed, and the top end of the first semi-finished machine shell (2) is provided with a stacking cavity (22) which is sunken towards the inner cavity of the machine shell; the error between the inner diameter of the first semi-finished shell (2) and the inner diameter of the preset shell is within a preset error range;
step 20), stretching a bottom shell of a stacking cavity (22) of the first semi-finished product shell (2) towards an opening direction of the stacking cavity, so that side wall shells of the stacking cavity are overlapped in the radial direction to form a stacking part (33) and a bearing chamber (32), and obtaining a second semi-finished product shell (3); a gap is formed between the double-layer shells of the stacking part (33) of the second semi-finished shell (3) in the radial direction;
step 30) reducing the gap between the double-layer shells of the stacking part (33) of the second semi-finished shell (3) so that the double-layer shells are attached to obtain a third semi-finished shell (4);
step 40), shaping the third semi-finished shell (4) to obtain a finished shell (5) meeting preset requirements;
the step 10) comprises the following steps:
step 101), stretching and forming the raw material sheet to form an original shell (1); the original shell (1) comprises a cylindrical shell (13), a round table-shaped shell (12) and a flat shell (11) which are sequentially connected from bottom to top, wherein the taper of the round table-shaped shell is 90-110 degrees;
step 102) stretching the flat plate-shaped shell of the original shell (1) towards the direction of the cylindrical shell, so that the round table-shaped shell forms the top end surface of the cylindrical shell, and a stacking cavity (22) recessed into the inner cavity is formed at the top end of the cylindrical shell, so as to obtain the first semi-finished shell (2).
2. The motor housing bearing chamber double-layer lamination forming process according to claim 1, characterized in that the error between the inner diameter of the bearing chamber (32) of the second semi-finished shell (3) and the inner diameter of a preset bearing chamber is within a preset error range;
the step 30) specifically includes:
and inserting a bearing chamber male die with the outer diameter being the inner diameter of a preset bearing chamber into a bearing chamber (32) of the second semi-finished product shell (3), and extruding an outer shell of the material stacking part (33) to enable the outer shell to be attached to an inner shell, so that the inner diameter of the bearing chamber is unchanged, the outer diameter of the bearing chamber is reduced, and the third semi-finished product shell (4) is obtained.
3. The motor housing bearing chamber double-layer lamination forming process according to claim 1, characterized in that the inner diameter of the bearing chamber (32) of the second semi-finished shell (3) is larger than the inner diameter of a preset bearing chamber;
the step 30) specifically includes:
and inserting a bearing chamber male die with the outer diameter being the inner diameter of a preset bearing chamber into a bearing chamber (32) of the second semi-finished product shell, and extruding an outer shell of a material stacking part (33) of the second semi-finished product shell (3) to enable the outer shell to be attached to an inner shell, so that the inner diameter of the bearing chamber and the outer diameter of the bearing chamber are reduced, and a third semi-finished product shell (4) is obtained.
4. The process for forming the double-layer stack of the bearing chamber of the motor housing according to claim 1, wherein in the step 40), the third semi-finished shell (4) is shaped by pressing the third semi-finished shell (4) by using the upper die assembly and the lower die assembly which are matched, so as to obtain the finished shell (5) meeting the preset requirements.
5. The process for forming a double-layered material for a bearing housing of a motor according to claim 4, wherein the step 40) specifically comprises:
placing the third semi-finished shell (4) on a stripper plate (604), pressing down an upper die assembly, and applying pressure on a jacking rod (612) by using a counter-pressure rod (611) to enable a lower die cylinder (610) to move downwards; the upper die assembly pushes the third semi-finished product shell (4) and the stripper plate (604) to move downwards, so that the third semi-finished product shell (4) smoothly enters the lower die assembly; the upper die assembly continues to be pressed down until the upper die assembly is matched with the lower die assembly, and the third semi-finished shell (4) is shaped to meet the preset requirement to obtain a finished shell (5);
the upper die assembly moves upwards and is separated from the lower die assembly, the lower die cylinder (610) moves upwards, and the stripper plate (604) and the finished machine shell (5) are driven to move upwards by the ejection rod (612) so that the finished machine shell is separated from the lower die assembly; the upper die assembly continues to move upwards, and after the finished machine shell is separated from the stripper plate (604), the upper die assembly separates the finished machine shell from the upper die assembly by utilizing elasticity, and the finished machine shell falls onto the stripper plate (604).
6. The process for double-layer lamination of bearing chambers of motor housings according to claim 1, characterized in that in step 20), the gap width in the radial direction between the double-layer shells of the lamination portion (33) of the second semi-finished housing (3) is 0.8-1.2 mm.
7. The process for forming a double-layered material for a bearing housing of a motor according to claim 1, wherein in the step 101), the sheet of raw material is subjected to stretch forming at least twice.
8. The process for forming a double-layered material for a bearing chamber of a motor housing according to claim 1, wherein in the step 101), each stretch forming is performed by using a different forming die.
9. The process for double-layer lamination forming of the bearing chamber of the motor housing according to claim 1, wherein in the step 20), the lamination cavity of the first semi-finished product housing is pressed by pressure by using a lamination forming mold, so that the side wall shells of the lamination cavity are overlapped in the radial direction to form a lamination part (33) and the bearing chamber (32), and the second semi-finished product housing (3) is obtained.
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| CN202310601038.3A CN116351943B (en) | 2023-05-26 | 2023-05-26 | Double-layer stacking forming process for bearing chamber of motor housing |
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| CN202310601038.3A CN116351943B (en) | 2023-05-26 | 2023-05-26 | Double-layer stacking forming process for bearing chamber of motor housing |
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| CN116351943B true CN116351943B (en) | 2023-08-15 |
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| CN116900170B (en) * | 2023-09-13 | 2023-12-01 | 苏州三维精密金属制品有限公司 | Side stacking workpiece stamping device and method thereof |
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| CN116351943A (en) | 2023-06-30 |
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