CN215544217U

CN215544217U - Female die cavity structure of miniature motor shell

Info

Publication number: CN215544217U
Application number: CN202120545255.1U
Authority: CN
Inventors: 葛晓帅; 叶浩平; 楼亚晖
Original assignee: Hengdian Group DMEGC Magnetics Co Ltd
Current assignee: Hengdian Group DMEGC Magnetics Co Ltd
Priority date: 2021-03-16
Filing date: 2021-03-16
Publication date: 2022-01-18
Anticipated expiration: 2031-03-16

Abstract

The utility model discloses a female die cavity structure of a miniature motor shell, which belongs to a die structure and comprises a female die cavity, wherein the female die cavity comprises a flat-position forming surface and a round-angle forming surface which are arranged at intervals, a flat-position stretching oblique angle is arranged at the bottom of the flat-position forming surface, a round-angle stretching oblique angle is arranged at the bottom of the round-angle forming surface, and the position of the joint of the round-angle stretching oblique angle and the round-angle forming surface is lower than the position of the joint of the flat-position stretching oblique angle and the flat-position forming surface; in the forming process, because the fillet forming surface contacts the material first, redundant materials can be extruded to the flat position, and the problems that the thickness of the flat position does not reach the standard and the roughness is not good in the prior art are solved.

Description

Female die cavity structure of miniature motor shell

Technical Field

The utility model relates to a die structure, in particular to a female die cavity structure of a miniature motor shell.

Background

The forming of the housing is typically accomplished by multiple stamping operations. The existing novel motor shell is mostly formed by four flat positions of four sides and four large R corners, the flat positions and the round corners have different wall thickness requirements, and if the flat positions and the round corners are stretched by the existing technical means in the forming process, the wall thickness of the flat positions cannot meet the requirements of customers.

For example, the "stretching die" disclosed in chinese patent document, publication No. CN205393309U, includes a die body and a stretching hole, and a joint between an inner sidewall top end of the stretching hole and an upper end surface of the die body has a stretching bevel. Compared with other prior art, because the stretching die in the utility model has the stretching oblique angle, the existence of the stretching oblique angle enables the material sheet to stably enter the stretching hole by adopting the surface contact mode in the process of stretching the material sheet of the gear shifting shaft sleeve, the surface contact is formed between the material sheet and the stretching oblique angle, compared with the point contact between the material sheet and the stretching angle in the prior art, the surface contact mode can reduce the galling phenomenon and the cracking proportion, the surface contact is easy to control the thickness change of the material sheet, the material sheet can not be quickly thinned in the initial stretching stage, after the gear shifting shaft sleeve is stretched into a finished product, the product surface can not be cracked after being placed for a long time, the safety performance of the gear shifting shaft sleeve in the use process is ensured, however, the defect is that the die is mainly suitable for parts which have the same round angle and flat position in the appearance, because the wall thickness of different positions of the part is different, in the process of stretching, the condition that the wall thickness cannot reach the standard is easily generated because the material is sparse at the thick part wall thickness, and the roughness of the inner wall after molding is not good.

Disclosure of Invention

The utility model provides a die cavity structure of a miniature motor shell, aiming at overcoming the problems that in the process of forming the miniature motor shell in the prior art, the wall thickness of a flat position is often difficult to reach the standard and the roughness of the inner wall is not good because the shape of the shell is provided with a round angle and the flat position at the same time, the size of the flat position of the shell can meet the requirement, the inner wall of the flat position is smoother after stretching, and therefore the symmetry degree of the flat position of the shell and the precision of an assembly position are greatly improved.

In order to achieve the purpose, the utility model adopts the following technical scheme:

the utility model discloses a female die cavity structure of a miniature motor shell, which comprises a female die cavity, wherein the female die cavity comprises a flat forming surface and a fillet forming surface which are arranged at intervals, a flat stretching oblique angle is arranged at the bottom of the flat forming surface, a fillet stretching oblique angle is arranged at the bottom of the fillet forming surface, and the position of the joint of the fillet stretching oblique angle and the fillet forming surface is lower than the position of the joint of the flat stretching oblique angle and the flat forming surface.

The die cavity is in the forming process, the tensile oblique angle of flat position and the tensile oblique angle of fillet play the guide effect, flat position profiled surface and fillet profiled surface play the spacing fashioned effect in the casing outside, because the tensile oblique angle of fillet is less than with the junction position of fillet profiled surface the tensile oblique angle of flat position and the junction position of flat position profiled surface, the fillet profiled surface is one step earlier contacted the material, carries out drawing earlier, carries out the stretch forming's in-process in the face of the material at the fillet shaping, because the mobility of material, can crowd some material to flat position department to make flat position department material volume increase, thereby guarantee the casing wall thickness of flat position department, also avoided flat position department casing because the material is sparse to lead to the relatively poor condition of inner wall roughness.

Preferably, the inclination angle of the fillet stretching oblique angle relative to the horizontal plane is smaller than that of the flat stretching oblique angle relative to the horizontal plane; when the bottom of die is directly adjacent with tensile oblique angle of fillet, the tensile oblique angle of flat position, through setting up different inclination, can make the tensile oblique angle of fillet and the high difference in upper end at the tensile oblique angle of flat position to realize that the fillet profiled surface contacts the material earlier than flat position profiled surface.

Preferably, the inclination angle of the fillet stretching oblique plane relative to the horizontal plane is 30 degrees, and the inclination angle of the flat stretching oblique plane relative to the horizontal plane is 45 degrees; the use of the inclination angle is convenient for the processing of the female die and has better guiding effect.

Preferably, the inclination angle of the fillet stretching oblique angle relative to the horizontal plane is equal to the inclination angle of the flat stretching oblique angle relative to the horizontal plane, and an oblique angle extension surface is arranged between the flat stretching oblique angle and the bottom of the cavity of the female die; the bevel extension surface can enable the bottom position of the flat forming surface to be raised, so that the round forming surface is in contact with the material before the flat forming surface.

Preferably, the inclination angle of the fillet stretching oblique plane relative to the horizontal plane and the inclination angle of the flat stretching oblique plane relative to the horizontal plane are both 30 degrees; the use of the inclination angle is convenient for the processing of the female die and has better guiding effect.

Preferably, a fillet forming arc angle is arranged at the joint of the fillet stretching oblique angle and the fillet forming surface; fillet shaping arc angle makes the fillet face of the casing after the shaping be difficult to produce the mar when the drawing of patterns.

Preferably, a flat forming arc angle is arranged at the joint of the flat stretching bevel and the flat forming surface; the flat position forming arc angle enables the flat position surface of the formed shell to be not easy to scratch during demoulding.

Therefore, the utility model has the following beneficial effects: (1) the round corner surface can be stretched and formed before the flat surface, so that the size of the flat position of the shell meets the requirement, and the inner wall of the flat position is smoother after stretching, so that the symmetry and the assembly position precision of the flat position of the shell are greatly improved; (2) the die is convenient to process; (3) the shell is not easy to scratch when demoulding.

Drawings

Fig. 1 is a schematic bottom view of a structure according to a first embodiment of the present invention.

Fig. 2 is a schematic cross-sectional structural diagram of a first embodiment of the present invention.

Fig. 3 is a schematic bottom view of the first embodiment of the present invention.

Fig. 4 is a schematic cross-sectional structural diagram of a second embodiment of the present invention.

Figure 5 is a schematic structural view of a miniature motor housing formed by the present invention.

In the figure: 1. the die comprises a female die cavity 2, a flat forming surface 3, a fillet forming surface 4, a flat stretching bevel 5, a fillet stretching bevel 6, a fillet forming arc angle 7, a flat forming arc angle 8, a micro motor shell 9, a fillet surface 10, a flat surface 11 and a bevel extension surface.

Detailed Description

The utility model is further described with reference to the following detailed description and accompanying drawings.

Embodiment one, as shown in fig. 1-2, a die cavity structure of miniature motor shell for become the miniature motor shell that fig. 5 shows, miniature motor shell 8 has four fillet faces 9 and four flat position faces 10, die cavity structure includes the die cavity, die cavity 1 includes flat position forming surface 2 and fillet forming surface 3, flat position forming surface and fillet forming surface respectively have four to use the axle center of die cavity to set up as axle circumference equipartition interval, the bottom of flat position forming surface is equipped with flat position tensile oblique angle 4, the lower part of flat position tensile oblique angle links to each other with the bottom of die cavity, the inclination of flat position tensile oblique angle relative to the horizontal plane is 45, the bottom of fillet forming surface is equipped with fillet tensile oblique angle 5, the lower part of fillet tensile oblique angle links to each other with the bottom of die cavity, the inclination of fillet tensile oblique angle relative to the horizontal plane of die is 30, the position of the joint of the fillet stretching bevel angle and the fillet forming surface is lower than the position of the joint of the flat stretching bevel angle and the flat forming surface; a fillet forming arc angle 6 is arranged at the joint of the fillet stretching oblique angle and the fillet forming surface; and a flat position forming arc angle 7 is arranged at the joint of the flat position stretching bevel and the flat position forming surface.

In the process of stretching and forming the shell of the miniature motor by the female die cavity, the position of the joint of the fillet stretching bevel angle and the fillet forming surface is lower than the position of the joint of the flat stretching bevel angle and the flat forming surface, the fillet forming surface contacts materials before the flat forming surface, so that stretching is performed firstly, and in the stretching process of the fillet surface, redundant materials are extruded between the flat forming surface and the male die, so that the material quantity of the flat position is increased, and the problems that the thickness of the flat position is not up to standard and the roughness of the inner wall is poor are avoided.

Embodiment two, as shown in fig. 3-4, a female die cavity structure of a micro motor casing is used for forming a micro motor casing 8 shown in fig. 5, the micro motor casing is provided with four fillet surfaces 9 and four flat surfaces 10, the female die cavity structure comprises a female die cavity 1, the female die cavity comprises a flat forming surface 2 and a fillet forming surface 3, the flat forming surface and the fillet forming surface are respectively provided with four flat forming surfaces and four fillet forming surfaces, the flat forming surfaces and the fillet forming surfaces are uniformly distributed and spaced around an axis of the female die cavity, a flat stretching bevel angle 4 is arranged at the bottom of the flat forming surface, a bevel extending surface 11 is arranged between the lower part of the flat stretching bevel angle and the bottom of the female die cavity, the inclination angle of the flat stretching bevel angle relative to the horizontal plane is 30 degrees, a fillet stretching bevel angle 5 is arranged at the bottom of the fillet forming surface, and the lower part of the fillet stretching bevel angle is connected with the bottom of the female die cavity, the inclination angle of the fillet stretching bevel angle relative to the horizontal plane is 30 degrees, and the position of the joint of the fillet stretching bevel angle and the fillet forming surface is lower than the position of the joint of the flat stretching bevel angle and the flat forming surface; a fillet forming arc angle 6 is arranged at the joint of the fillet stretching oblique angle and the fillet forming surface; and a flat position forming arc angle 7 is arranged at the joint of the flat position stretching bevel and the flat position forming surface.

Claims

1. The utility model provides a die cavity structure of micro motor shell, characterized by, includes the die cavity, the die cavity includes flat position one-tenth profile and the fillet one-tenth profile that the interval set up, the bottom of flat position one-tenth profile is equipped with the tensile oblique angle of flat position, the bottom of fillet one-tenth profile is equipped with the tensile oblique angle of fillet, the tensile oblique angle of fillet is less than with the junction position of fillet one-tenth profile the tensile oblique angle of flat position is less than with the junction position of flat position one-tenth profile.

2. The die cavity structure of a miniature motor casing as claimed in claim 1, wherein the angle of inclination of the fillet stretching bevel relative to the horizontal plane is smaller than the angle of inclination of the flat stretching bevel relative to the horizontal plane.

3. The die cavity structure of a miniature motor casing as claimed in claim 2, wherein the angle of inclination of the fillet stretching bevel relative to the horizontal plane is 30 °, and the angle of inclination of the flat stretching bevel relative to the horizontal plane is 45 °.

4. The die cavity structure of the miniature motor casing as claimed in claim 1, wherein the angle of inclination of the fillet stretching bevel relative to the horizontal plane is equal to the angle of inclination of the flat stretching bevel relative to the horizontal plane, and a bevel extension plane is arranged between the flat stretching bevel and the bottom of the die cavity.

5. The die cavity structure of a miniature motor casing as claimed in claim 4, wherein the angle of inclination of the fillet stretching bevel relative to the horizontal plane and the angle of inclination of the flat stretching bevel relative to the horizontal plane are both 30 °.

6. The die cavity structure of a miniature motor casing according to any one of claims 1-5, wherein a fillet forming arc corner is arranged at the joint of the fillet stretching bevel and the fillet forming surface.

7. The female die cavity structure of the miniature motor casing as claimed in any one of claims 1 to 5, wherein a flat forming arc angle is provided at the joint of the flat stretching bevel and the flat forming surface.