CN115971317A - Deep drawing process and key parameter selection method for mirror surface motor shell - Google Patents
Deep drawing process and key parameter selection method for mirror surface motor shell Download PDFInfo
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- CN115971317A CN115971317A CN202211606612.6A CN202211606612A CN115971317A CN 115971317 A CN115971317 A CN 115971317A CN 202211606612 A CN202211606612 A CN 202211606612A CN 115971317 A CN115971317 A CN 115971317A
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Abstract
The invention discloses a deep drawing process and a key parameter selection method for a mirror surface motor shell, which comprise the following steps: determining the diameter of a blank, the drawing times and the drawing clearance according to the structural size of the mirror surface drawing motor shell; calculating the process part parameters of each pass of the motor shell and determining a process scheme; constructing a mirror surface motor shell drawing deformation process model, carrying out motor shell drawing deformation simulation, and determining the thickness thinning rate and the thickness super-difference value of the motor shell according to the thickness distribution of the motor shell; and adjusting the structure and technological parameters of the drawing die, and combining analog simulation to enable the motor shell to realize a mirror surface effect in the last drawing.
Description
Technical Field
The invention relates to the technical field of micro motor shell manufacturing, in particular to a deep drawing process and a key parameter selection method for a mirror surface motor shell.
Background
With the rapid development of various intelligent and automatic electric products, the demand and quality requirements of the market on the micro motor are higher and higher. The shell of the micro-motor has the functions of a part carrier, load bearing, core part protection and the like on a micro-motor product. The quality requirements of micro-motor housings are gradually increasing from the requirements of dimensional accuracy to the requirements of surface quality, for example, some micro-motor housings require that the surface of the housing have a mirror surface effect. In order to make the surface of the shell of the micro-motor have a mirror effect, the traditional technology adopts polishing, and the smoothness of the surface of a product is improved by manual grinding. The micromotor shell is usually made of galvanized steel plates, and the polishing method can not only damage the plating on the surface of the material so as to reduce the corrosion resistance of the workpiece, but also increase the production period and labor cost. The invention discloses a deep drawing process of a mirror motor shell and a key parameter selection method. The method has high processing efficiency and low cost, and can ensure that the surface zinc coating and the anti-corrosion performance of the motor shell are not damaged.
In the prior art, the design method of the reversing deflection high-speed permanent magnet motor for the dust collector comprises the following comparison patents and documents:
1) A mirror deep drawing process (CN201010102112. XP) with shell thinning amount of more than 1MM discloses a shell thinning mirror deep drawing process, which comprises thinning drawing and saponification treatment, wherein four times of drawing is adopted, and saponification treatment is carried out in the middle of each drawing. After the saponification treatment process is added, the thinning amount of the ironing is improved, compared with the traditional method, the method provided by the invention obviously reduces the number of times of ironing and improves the production efficiency, but the process difficulty is increased and the die loss is increased by adopting a strong ironing process.
2) A method for deep drawing the mirror surface parts of wing tip covers (CN 200910055650.5[ P ]) discloses a method for deep drawing the mirror surface parts of wing tip covers, which realizes the mirror surface of the parts by controlling the contour line offset preset value of a mould, the shape of a blank, the size of a mould fillet, lubricating measures, the positioning mode of the blank, the deep drawing pressure, the edge pressing pressure, the pressure maintaining time and other measures, and has more complex technical process.
3) A deep drawing forming process for the mirror-surface wing tip part of passenger plane (plastic engineering report, 2012,19 (6): 50-53.) is disclosed. The method realizes the mirror surface deep drawing of the 2219-O mirror surface wing tip part of the aluminum alloy plate by reasonably setting process parameters, controlling strain distribution, inhibiting the generation of surface defects such as coarse grains and the like by using a numerical simulation technology and a test method.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide a deep drawing process and a key parameter selection method for a mirror surface motor shell.
The purpose of the invention is realized by the following technical scheme:
a deep drawing process and key parameter selection method for a mirror surface motor shell comprises the following steps:
step A, determining the diameter of a blank, the drawing times and the drawing clearance according to the structural size of a mirror surface drawing motor shell;
step B, calculating the process part parameters of each pass of the motor shell and determining a process scheme;
step C, constructing a mirror surface motor shell drawing deformation process model, carrying out motor shell drawing deformation simulation, and determining the thinning rate and the thickness super-difference value of the motor shell according to the thickness distribution of the motor shell;
and D, adjusting the structure and technological parameters of the drawing die, and combining simulation to enable the motor shell to realize a mirror surface effect in the last drawing.
One or more embodiments of the present invention may have the following advantages over the prior art:
the invention discloses a deep drawing process and a die device for a mirror motor shell, which can realize mirror polishing of the outer surface of a motor shell. The diameter of a blank and the size of a drawing process part are determined according to a volume invariance principle, the drawing thinning rate and the thickness super-difference value of the motor shell are calculated by adopting simulation, the optimal drawing process parameter is determined, the specific structure of a mirror surface drawing die device of the motor shell can be finally determined, and the mirror surface polishing of the surface of the motor shell is realized. The method does not need the traditional polishing procedure, synchronously finishes mirror polishing in the drawing process, can ensure that the zinc coating on the surface of the motor shell is not damaged, and further ensures the anti-corrosion performance of the motor shell; meanwhile, the method improves the production efficiency, saves the labor cost and reduces the material loss by reducing the working procedures, and is a green processing method.
Drawings
FIG. 1 is a flow chart of a drawing process and key parameter selection method for a mirror motor housing;
FIG. 2 is a block diagram of a mirror motor housing thinning rate analysis modeling and key parameter selection method routine;
figure 3 is a schematic view of mirror motor housing drawing die equipment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the following embodiments and accompanying drawings.
As shown in fig. 1 and 2, a method for selecting a deep drawing process and key parameters of a mirror motor shell comprises the following steps:
step 20, calculating the process part parameters of each pass of the motor shell according to the volume invariance principle, and determining a process scheme;
step 30, constructing a mirror surface motor shell deep drawing deformation process model, carrying out motor shell deep drawing deformation simulation, and determining the thickness thinning rate and the thickness super-difference value of the motor shell according to the thickness distribution of the motor shell;
and step 40, adjusting the structure and technological parameters of the drawing die, and combining simulation to enable the motor shell to realize a mirror surface effect in the last drawing.
In the step 10, the diameter of the blank is determined according to the volume invariance principle, and if the thickness of the plate blank is t 0 The thickness of the part is t, and the area of each characteristic region of the case is A i Therefore, the calculation formula of the blank diameter D is as follows:
in the step 10, the last drawing clearance is a negative clearance, and the drawing clearances of the other passes are obtainedAnd (4) material thickness value. If the drawing times is 3 times, the thickness delta of the motor shell blank 0 Diameter D of the blank 0 Depth h after drawing in the first stage 1 Diameter D 1 Die clearance delta 1 After the second stage of drawing, depth h 2 Diameter D 2 Die clearance delta 2 After the third stage of drawing, depth h 3 Diameter D 3 A gap delta 3 And then, the calculation formula of the final drawing clearance is as follows:
in the above step 20, if the drawing diameter of the previous pass is d i The diameter of the last drawing is d, the thickness of the part is t, so the fillet radius R of the punch of the last drawing Ti-1 The calculation formula is as follows:
in the step 30, the blank material of the motor shell adopts a galvanized steel sheet; coating drawing oil on the surface of the motor shell blank; the thinning rate of the thickness of the motor shell is controlled to be less than 25%, and the out-of-tolerance value of the thickness of the shell is controlled to be less than +/-0.3 mm.
In the step 40, the structure and technological parameters of the drawing die are adjusted, and simulation is combined, so that the mirror surface effect of the motor shell in the last drawing is realized, and the arithmetic mean deviation Ra of the surface roughness profile of the motor shell reaches 0.20 mu m.
As shown in fig. 3, in the deep drawing die device adopted in the present project, in the deep drawing forming process of the motor housing, the press machine drives the upper die plate 1 and the push rod 2, the backing plate 3, the female die positioning ring 4, the female die fixing plate 5, the push rod limiting ring 6, the female die 7 and the upper die plate limiting rod 15 connected with the upper die plate 1 to move downwards, the upper die plate limiting rod 15 is pressed downwards after contacting with the support plate 11, the support plate 11 drives the male die outer sleeve 10 and the support rod 14 to move downwards, the male die 8 is ejected out of the male die outer sleeve 10, and completes stamping in cooperation with the push rod 2, the push rod limiting ring 6 and the female die 7 at the upper part, the upper part moves upwards when resetting, the push rod 2 ejects a workpiece under the action of external force, male die positioning blocks 9 are arranged at two sides below the male die 8 for positioning the male die, and the male die 12 is used for deep drawing the male die; a lower die holder 13 is provided below the drawing die.
Although the embodiments of the present invention have been described above, the above descriptions are only for the convenience of understanding the present invention, and are not intended to limit the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (7)
1. A deep drawing process and a key parameter selection method for a mirror surface motor shell are characterized by comprising the following steps:
step A, determining the diameter of a blank, the drawing times and the drawing clearance according to the structural size of a mirror surface drawing motor shell;
step B, calculating the process part parameters of each pass of the motor shell and determining a process scheme;
step C, constructing a mirror surface motor shell deep drawing deformation process model, carrying out motor shell deep drawing deformation simulation, and determining the thickness thinning rate and the thickness super-difference value of the motor shell according to the thickness distribution of the motor shell;
and D, adjusting the structure and technological parameters of the drawing die, and combining simulation to enable the motor shell to realize a mirror surface effect in the last drawing.
2. A method for deep-drawing a mirror motor casing and selecting key parameters as claimed in claim 1, wherein the calculation principle of the blank volume in step A is the principle of constant volume, the size of the motor casing is obtained, and if the thickness of the sheet blank is t 0 The thickness of the part is t, and the area of each characteristic region of the case is A i Therefore, the calculation formula of the blank diameter D is as follows:
3. a method for selecting a drawing process and a key parameter of a mirror motor casing according to claim 1, wherein the number of drawing times in the step a includes at least three.
4. The mirror motor housing drawing process and key parameter selection method of claim 1, wherein in step a, the drawing gap is a key parameter, wherein the last drawing gap is a negative gap, and the rest of the drawing gaps are material thickness values; if the drawing times is 3 times, the thickness delta of the motor shell blank 0 Diameter D of the blank 0 Depth h after drawing in the first stage 1 Diameter D 1 Die clearance delta 1 After the second drawing stage, depth h 2 Diameter D 2 Die clearance delta 2 After the third stage of drawing, depth h 3 Diameter D 3 A gap delta 3 And then, the calculation formula of the final drawing clearance is as follows:
5. the mirror motor housing drawing process and the method for selecting the key parameter according to claim 1, wherein in the step B, the process piece parameter of each pass of the motor housing is calculated according to the principle of volume invariance, wherein the fillet radius of the convex mold in the last pass of drawing is the key process parameter, and the diameter of the drawing in the previous pass is d i The diameter of the last drawing is d, the thickness of the part is t, so the fillet radius R of the punch of the last drawing Ti-1 The calculation formula is as follows:
6. a method for selecting a critical parameter and a drawing process of a mirror motor casing as claimed in claim 1, wherein in the step C, the thinning rate of the motor casing thickness is less than 25%, and the out-of-tolerance of the casing thickness is less than ± 0.3mm.
7. The mirror motor case drawing process and the method for selecting key parameters according to claim 1, wherein the arithmetic mean deviation Ra of the surface roughness profile of the motor case in the step D is 0.20 μm.
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| CN113770243A (en) * | 2021-09-10 | 2021-12-10 | 大连理工大学 | Forming method of deep-cavity thin-wall metal component with extremely-small fillet radius |
| CN114909404A (en) * | 2022-06-06 | 2022-08-16 | 横店集团东磁股份有限公司 | Method for manufacturing machine shell with double-layer bearing positions |
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- 2022-12-13 CN CN202211606612.6A patent/CN115971317A/en active Pending
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Application publication date: 20230418 |