CN218015234U

CN218015234U - Motor casing stretch forming die

Info

Publication number: CN218015234U
Application number: CN202221458844.7U
Authority: CN
Inventors: 徐明生
Original assignee: Zhenjiang Finemetal Automotive Components Co ltd
Current assignee: Zhenjiang Finemetal Automotive Components Co ltd
Priority date: 2022-06-09
Filing date: 2022-06-09
Publication date: 2022-12-13
Anticipated expiration: 2032-06-09

Abstract

The utility model discloses a motor housing stretch forming die. The drawing die comprises an upper die assembly with a drawing die and a lower die assembly matched with the upper die assembly and provided with a drawing male die, wherein the drawing die is provided with an inner cavity used for forming the outer surface of a shell to be formed, the drawing male die is provided with a protruding section capable of extending into the inner cavity of the drawing die, the protruding section is provided with a large diameter section matched with the lower half section of the inner cavity of the shell to be formed and a neck reducing section connected to the large diameter section and matched with the upper half section of the inner cavity of the shell to be formed, and a distance used for forming the wall thickness of the shell is arranged between the inner cavity of the drawing die and the protruding section of the drawing male die. After the structure is adopted, the purpose of reverse compensation of the local poor size position of the product is realized, so that the diameters of the product after stretch forming in all depths except the R angle position of the female die are relatively kept consistent and stable, and the size requirement of the product is met.

Description

Motor casing stretch forming die

Technical Field

The utility model relates to a forming die of shell class part, especially a motor casing stretch forming die that is used for machining diameter phi 116, degree of depth to exceed 30 mm.

Background

For some chassis parts, a forming die is usually adopted for production, particularly for some motor casings such as a battery cooler of an electric automobile, the motor casings are used as brushless motor casings, the requirement on the dimensional accuracy is greatly improved compared with that of the traditional brush motor, and particularly, the requirement on the position of a measuring depth must be met within a specified stretching depth (for example, phi 116+0.066/-0.074 specification size), and the requirement on the position of the measuring depth must also be met within the specified stretching depth (as shown in FIG. 1, the inner diameter size of 8709116 must be measured at the position of three-layer depth from the inward facing 3mm, 16.5mm and 30mm of a mouth flange); however, because each part material atress condition is different in the product stretch forming process to can lead to the material thickness of product each position to change, this change result makes tensile internal diameter different in different depth positions again:

the usual result is that near the R angular position of the punch, the inner diameter size becomes larger beyond the upper deviation due to the severe thinning of the material; the thickness of the material at the middle position is basically kept unchanged, so that the requirement can be met; and oral area position is because the material receives extrusion deformation can the bodiness, factor influences such as resilience after the plastic of oral area position again, lead to this position can the internal diameter to be close or surpass down the deviation, so will lead to the different degree of depth position internal diameter size deviation of product great (oral area, top, intermediate position's size deviation great), it is thus visible, the internal diameter size that conventional mould structure hardly guaranteed the product meets the requirements at whole stretching height, consequently, how to design one set of mould that can satisfy high accuracy processing requirement becomes the technological problem who awaits the opportune moment.

Disclosure of Invention

The to-be-solved technical problem of the utility model is to provide a structural design is simple and can guarantee that tensile back product internal diameter keeps the relatively unanimity on the different degree of depth to satisfy the motor housing stretch forming die of product dimensional requirement.

In order to solve the technical problem, the utility model discloses a motor case stretch forming die, including last mould subassembly that has tensile die and with last mould subassembly complex lower mould subassembly that has tensile terrace die, tensile die has the surface that is used for treating fashioned shell and carries out fashioned inner chamber, tensile terrace die has the bulge section that can stretch into in the inner chamber of tensile die, the bulge section has one section and treats the big diameter section of the inner chamber second section matched with of fashioned shell and one section link up on this big diameter section and with the inner chamber first section complex neck section of treating fashioned shell, the wall thickness that has the shell that is used for between the inner chamber of tensile die and the bulge section of tensile terrace die carries out fashioned interval.

The length of the neck reducing section is 3-6 times of the length of the large-diameter section.

The upper die assembly further comprises an upper die base, an upper die plate, a transition plate, a positioning installation assembly and a material ejection assembly, wherein the upper die base, the upper die plate, the transition plate, the positioning installation assembly and the material ejection assembly are sequentially arranged from top to bottom, the positioning installation assembly is arranged on the upper die plate, and the material ejection assembly is located below the transition plate and provided with a placement cavity.

The positioning and mounting assembly is composed of an upper base plate and a fixing plate matched with the upper base plate.

The material ejecting assembly comprises a nitrogen spring which is positioned and installed through an upper template and a transition plate, and an inner material ejecting block which is arranged in an arranging cavity of the positioning and installing assembly.

The lower die assembly further comprises a lower die base, a lower die plate, a lower fixing plate and a blank pressing power device, the lower die base is arranged from bottom to top in sequence, the lower die plate is arranged above the lower die base, the lower fixing plate is arranged above the lower die plate, the blank pressing power device is arranged above the lower fixing plate, and the stretching male die is arranged in the centers of the lower fixing plate and the blank pressing power device.

After the structure is adopted, the convex section of the stretching male die is designed into the large-diameter section and the neck-reducing section, so that reverse compensation for local poor size positions of a product is skillfully realized through the matching of the large-diameter section and the lower half section of the inner cavity of the shell to be formed and the matching of the neck-reducing section and the upper half section of the inner cavity of the shell to be formed, the diameters of the product in all depths except the R angle position of the female die are kept consistent and stable relatively, and the size requirement of the product is met.

Drawings

Fig. 1 is a schematic cross-sectional structure diagram of a shell to be formed in the present invention;

fig. 2 is a schematic view of the overall structure of the stretch forming die for the motor casing of the present invention;

fig. 3 is a schematic structural view of the middle stretching male die of the present invention.

Detailed Description

The following describes the stretch forming die for motor housing in further detail with reference to the accompanying drawings and the detailed description.

As shown in the figure, the utility model discloses a motor casing stretch forming die, including the upper die assembly 2 and the lower die assembly 4 matched with the upper die assembly, the upper and lower die assemblies are guided by the guide pillar and the guide sleeve, as can be seen from figure 2, the upper die assembly 2 includes the upper die base 8, the upper die plate 9 mounted on the upper die base, the transition plate 10 mounted on the upper die plate, the positioning installation assembly 11 with the setting cavity positioned below the transition plate, the liftout assembly 12 capable of carrying out liftout and the stretching cavity die 1 with the inner cavity for carrying out the forming on the outer surface of the shell to be formed, wherein, the positioning and mounting assembly 11 is composed of an upper backing plate 13 and a fixing plate 14 matched with the upper backing plate, the stretching cavity die 1 is mounted below the positioning and mounting assembly 11, the liftout assembly 12 comprises a nitrogen spring 15 which is positioned and mounted through an upper template 9 and a transition plate, and an inner liftout block 16 arranged in a mounting cavity of the positioning and mounting assembly 11, so that the inner liftout block 16 can be pushed by the nitrogen spring to complete the action of pushing the product out of the stretching cavity die; the lower die assembly 4 comprises a lower die base 17, a lower die plate 18, a lower fixing plate 19, a blank pressing machine 20 and a drawing male die 3, wherein the lower die base 17, the lower die plate 18, the lower fixing plate 19, the blank pressing machine 20 and the drawing male die 3 are sequentially arranged from bottom to top, the lower fixing plate 19 is arranged above the lower fixing plate, the blank pressing machine 20 is arranged above the lower fixing plate, the drawing male die 3 is arranged in the centers of the lower fixing plate 19 and the blank pressing machine 20, the drawing male die 3 is provided with a convex section 5 which can extend into an inner cavity of a drawing female die, the flange and port materials can be slightly thickened in the drawing and shaping process are fully considered, the inner diameter of the port can also generate certain resilience and shrinkage and other factors, so that the convex section 5 is provided with a large-diameter section 6 matched with the lower half section of the inner cavity of a shell to be shaped and a necking section 7 connected to the large-diameter section and matched with the upper half section of the inner cavity of the shell to be shaped, the length of the necking section 7 is 3-6 times of the length of the large-diameter section 6, a distance for forming the wall thickness of the shell is arranged between the inner cavity of the stretching female die 1 and the protruding section of the stretching male die 3, the distance determines the wall thickness of the shell, the sizes of the necking section 7 and the large-diameter section 6 are obtained by measuring the inner diameter of a stretch forming product at each depth level, the size of data obtained by measurement is designed, the size of the position of a mouth part is properly adjusted and increased through the structural design, in addition, in order to ensure that material stripping is smooth, the upper part of the stretching male die can be machined into an inclination of 0.24 degree.

The working principle is as follows:

a blanking sheet (blank) is placed on the upper surface of the edge pressing device, an upper die assembly moves downwards, firstly, the lower plane of a female die is stretched to press the upper plane of the blanking sheet, and a material pressing force is realized by a machine tool from a lower belt air cushion; the upper die assembly compresses the blanking sheet to continue descending along with the blank pressing device, the blanking sheet is gradually pulled into the stretching female die along the stretching male die to complete stretching, the upper die assembly returns, the inner ejector block pushes a formed product out of the stretching female die under the action of the nitrogen spring, and meanwhile, the blank pressing device completes floating and resetting actions through the lower air cushion.

This embodiment uses the blank that the diameter is 182 mm, thickness is 2.6mm to verify for the raw materials processing external diameter for 120.7 +/-0.2 mm, thickness are 2.5mm and the degree of depth is 35.3mm product, process the utility model discloses a motor housing stretch forming die processing back, product internal diameter size (each degree of depth position) measured data is as follows:

(1) 3mm depth R angle is too large to measure (need to rely on shaping process to realize)

(2) 16.5mm depth phi 116.00-116.01

(3) Depth of 30mm phi 116.00-116.02

The scheme is verified for many times; the inner diameter of the opening part of the product is basically consistent with the inner diameter of other depths, and the requirement of the product on the inner diameter at each depth is completely met.

Of course, the above description is not intended to limit the present invention, and the present invention is not limited to the above examples, and the changes, modifications, additions or substitutions made by those skilled in the art within the scope of the present invention should also belong to the protection scope of the present invention.

Claims

1. The utility model provides a motor case stretch forming die, including last mould subassembly (2) that have tensile die (1) and with last mould subassembly complex have tensile terrace die (3) lower mould subassembly (4), its characterized in that: tensile die (1) has the surface that is used for treating fashioned shell and carries out fashioned inner chamber, tensile terrace die (3) have can stretch into bulge section (5) in the inner chamber of tensile die, bulge section (5) have one section with treat under the inner chamber of fashioned shell half section matched with big diameter section (6) and one section link up on this big diameter section and with treat on the inner chamber of fashioned shell half section matched with neck section (7), it carries out fashioned interval to have the wall thickness that is used for the shell between the bulge section of the inner chamber of tensile die (1) and tensile terrace die (3).

2. The stretch-forming die for motor casings as claimed in claim 1, wherein: the length of the neck-reducing section (7) is 3-6 times of the length of the large-diameter section (6).

3. The motor case stretch-forming die as claimed in claim 1 or 2, wherein: go up mould component (2) still including upper die base (8), upper die plate (9) of installation on the upper die base that from top to bottom set gradually, install cab apron (10) on the upper die plate, be located the location installation component (11) that have the arrangement chamber of cab apron below and liftout subassembly (12) that can carry out the liftout.

4. The motor case stretch-forming die of claim 3, wherein: the positioning and mounting assembly (11) is composed of an upper backing plate (13) and a fixing plate (14) matched with the upper backing plate.

5. The motor case stretch-forming die of claim 4, wherein: the material ejecting component (12) comprises a nitrogen spring (15) which is positioned and installed through an upper template (9) and a transition plate, and an inner material ejecting block (16) which is arranged in an arranging cavity of the positioning and installing component (11).

6. The motor casing stretch-forming die of claim 1, 2, 4 or 5, wherein: the lower die assembly (4) further comprises a lower die holder (17), a lower die plate (18), a lower fixing plate (19) and a blank pressing power device (20), wherein the lower die holder (17), the lower die plate (18), the lower fixing plate (19) and the blank pressing power device (20) are sequentially arranged from bottom to top, the lower fixing plate (19) is arranged above the lower die plate, and the drawing male die (3) is arranged at the center of the lower fixing plate (19) and the blank pressing power device (20).