CN107984039B - A kind of progressive die Screw thread process method - Google Patents
A kind of progressive die Screw thread process method Download PDFInfo
- Publication number
- CN107984039B CN107984039B CN201711369976.6A CN201711369976A CN107984039B CN 107984039 B CN107984039 B CN 107984039B CN 201711369976 A CN201711369976 A CN 201711369976A CN 107984039 B CN107984039 B CN 107984039B
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- tapping
- gear
- blank
- progressive die
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23G—THREAD CUTTING; WORKING OF SCREWS, BOLT HEADS, OR NUTS, IN CONJUNCTION THEREWITH
- B23G1/00—Thread cutting; Automatic machines specially designed therefor
- B23G1/16—Thread cutting; Automatic machines specially designed therefor in holes of workpieces by taps
- B23G1/20—Machines with a plurality of working spindles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23G—THREAD CUTTING; WORKING OF SCREWS, BOLT HEADS, OR NUTS, IN CONJUNCTION THEREWITH
- B23G11/00—Feeding or discharging mechanisms combined with, or arranged in, or specially adapted for use in connection with, thread-cutting machines
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Press Drives And Press Lines (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
Abstract
A kind of progressive die Screw thread process method comprising following steps step A provides a tapping device in progressive die, and step B, when material strip is sent to the tapping device of step A offer in progressive die, screw thread process operation is completed in tapping device operation.A kind of progressive die Screw thread process method provided by the present invention is, it can be achieved that complete screw thread process in the punching course of progressive die, to be conducive to realize the manless production of high-precision motor rotor installation shell.
Description
Technical field
The present invention relates to machinery manufacturing technology field, in particular to a kind of horizontal direction completed in progressive die to blank
With the method for vertical direction screw thread process.
Background technique
Motor mounting shell is usually to be process by plate by punching process, and Fig. 1 is a kind of motor mounting shell
Principle schematic diagram；Fig. 2 is the A-A revolved section principle schematic diagram of Fig. 1；Fig. 3 is the B of Fig. 1 to visual angle schematic diagram；Ginseng
As shown in figure 1 to 3, the 1 type face of motor mounting shell is more complex, is the tubular construction of bottom opening, and side wall is provided with a water
Flat thread hole 11, skirt 100 is provided with multiple through-holes 12 and step threaded hole 13, and 100 outer of skirt is provided with multiple notches,
Top surface is provided with mounting hole 14, kidney slot 15 and recessed portion 16, and top surface is provided centrally with stepped hole 17.
The existing manufacturing method of above-mentioned motor mounting shell is the forming of single mold Multi-step forming, and Fig. 4 is shown in FIG. 1 electronic
The existing manufacturing process schematic illustration of machine mounting shell shows the base that each work step is completed in existing manufacturing process in Fig. 4
The revolved section structural schematic diagram of the overlooking structure diagram of part and the corresponding position A-A as shown in Figs. 1-2, referring to fig. 4 institute
Show, existing manufacturing process is divided into 12 work steps, successively are as follows: blanking → drawing → reverse drawing → drawing → thick whole → finishing → is cut
Side → punching → hole flanging → rushes side opening → bottom surface tapping → side tapping.Used 12 molds, the mold purposes of each work step according to
It is secondary to be described as follows:
Blanking die: prepare round slab.
First cupping tool: formed cylinder body main structure.
Reverse redrawing mold, the second cupping tool, thick reshaping die, finishing mold: molding top surface type face forms the recess
It portion 16 and prepares for the stepped hole 17.
Shaving die: the notch of molding skirt 100.
Punching die: forming through hole 12, mounting hole 14, kidney slot 15, stepped hole 17.
Hole flanging mold: the step base hole of molding step threaded hole 13.
Side opening punching die tool: the base hole of constitutive levels threaded hole 11.
Bottom surface tapping mold: molding step threaded hole 13.
Side tapping mold: constitutive levels threaded hole 11.
Existing manufacturing method needs more operator, and labor productivity is low, in addition to rushing side opening, bottom surface tapping and side
Tapping these three work steps in face do not use impact style to realize, such as bottom surface tapping and side tapping the two work steps are to consolidate blank
Surely it is placed on mold and carries out tapping with threading apparatus again.Other work steps are all made of impact style processing, in product punching course
In be affected by human factors larger (manual feeding), it is difficult to guarantee motor stator rotor installation shell finished size qualification rate.
Progressive die is multitask progressive die, may include punching in a secondary mold, brake forming and stretching etc. are a variety of
Multiple working procedure has very high productivity.
For the motor mounting shell of Fig. 1, in existing manufacturing process remove rush side opening, bottom surface tapping and side tapping this
Other nine work steps outside three work steps easily can be designed as one by carrying out simple transformation to existing work step mold
Progressive die is covered, but due to being generally not provided screw thread process ability in existing grading mold technique, how will rush side opening, bottom
Face tapping and side tapping these three work steps, especially the bottom surface tapping of processing screw thread and side tapping the two work steps are integrated into
Progressive die, with regard to becoming letter problem to be solved.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of progressive die Screw thread process methods, front institute is reduced or avoided
The problem of mentioning.
In order to solve the above technical problems, being used for the invention proposes a kind of progressive die Screw thread process method in progressive die
In screw thread process is carried out to motor mounting shell 1, the motor mounting shell is the tubular construction of bottom opening, and side wall is provided with
One horizontal threaded bore, skirt is provided with multiple through-holes and step threaded hole, and skirt outer is provided with multiple notches, and top surface is set
It is equipped with mounting hole, kidney slot and recessed portion, top surface is provided centrally with stepped hole, and described method includes following steps
Step A, in progressive die provide a tapping device, the tapping device 5 it include mold and tapping under tapping
Upper mold, the tapping upper mold include passing through upper pneumatic bomb with the cope plate of progressive die for compress positioning to blank
The upper compressing member of spring connection, the driving screw rod being fixedly connected with cope plate, the first nitrogen gas spring and at least one first pressure roller,
Mold includes the lower support element being fixedly connected with the lower template of progressive die for being positioned to blank under the tapping, under
Retainer plate that template is connected by lower pneumatic spring and with the lower support element slidable connection, is fixedly connected with lower template
Side tapping pedestal, tapping support being connect with lower template by Rectangular Spring and with the side tapping pedestal slidable connection,
The retainer plate bottom is fixedly connected at least one first drive screw, and the lower template is provided with and the first transmission spiral shell
Corresponding the first transmission gear for being provided with screwed hole of centre of bar, for processing the first tapping screw tap of the step threaded hole,
The first tapping screw tap is connect by the first driven wheel with first transmission gear；The tapping support is provided with can be horizontal
The second mobile tapping screw tap, the second tapping screw tap are socketed in a first vertical gear, the first vertical gear
It is engaged with a second vertical gear, the second vertical gear passes through a first coaxial vertical bevel gear and a setting
There is the first level transmission gear of coaxial first level bevel gear to connect, the first vertical bevel gear nibbles with first level bevel gear
It closes, the first level transmission gear is engaged by second intermediate gear with second driving wheel, second transmission
Wheel is provided centrally with threaded hole corresponding with the driving screw rod.
Step B, when material strip is sent to the tapping device of step A offer in progressive die, tapping process is to work as upper mold
When plate is run down under punching machine effect, upper compressing member is contacted with blank top surface, and compressing blank is run down, and be that is to say and is passed through institute
It states the first pressure roller while oppressing retainer plate and run down, while the first nitrogen gas spring is oppressed the tapping support and run down,
During running down, the driving screw rod not will push the second driving wheel rotation.
After blank is inserted in the lower support element, the retainer plate during running down, the first drive screw to
Bottom offset can drive the rotation of the first transmission gear by the screwed hole of centre of the first transmission gear, thus via the first driven wheel band
Dynamic first tapping screw tap rotation, blank continues to move down after contacting with the first tapping screw tap, that is, the first tapping screw tap phase
Blank is moved upwards, so that the tapping of step threaded hole is completed,
When the upper compressing member is mobile in place, it that is to say that the upper compressing member and the lower support element are completed to stablize to blank
After clamping, for blank downwards completely into lower support element and after being fixed, the lower pneumatic spring stops deformation, the tapping support
It also is moved into position and lower template stops the relative displacement of vertical direction, at this point, the upper pneumatic spring continues to deform, that is, institute
It states cope plate to continue to be displaced, first nitrogen gas spring also continues to deform, and pushes the driving screw rod to move downward, the active
The linear motion of screw rod drives the rotation of the second driving wheel, and successively via the second intermediate gear, the first level transmission gear,
First level bevel gear, the first vertical bevel gear, the second vertical gear drive the first vertical gear rotation, to convert again
The horizontal rotation feed motion of 11 position of horizontal threaded bore is corresponded on blank for the second tapping screw tap, to complete to water
The tapping in flat thread hole.
During the cope plate is run up, the inverse operation of the above process is finally completed screw thread process operation.
A kind of progressive die Screw thread process method provided by the present invention is, it can be achieved that complete spiral shell in the punching course of progressive die
Line processing greatly reduces to be conducive to realize the manless production of high-precision motor rotor installation shell to pressman
And the demand of stamping equipment.Production efficiency greatly improves, remarkable in economical benefits.Simultaneously because eliminate manual operation etc. it is unstable because
Element influences, and improves product manufacturing precision and quality stability.
Detailed description of the invention
The following drawings are only intended to schematically illustrate and explain the present invention, not delimit the scope of the invention.Wherein,
Fig. 1 is a kind of principle schematic diagram of motor mounting shell；
Fig. 2 is the A-A revolved section principle schematic diagram of Fig. 1；
Fig. 3 is the B of Fig. 1 to visual angle schematic diagram；
Fig. 4 is the existing manufacturing process schematic illustration of motor mounting shell shown in FIG. 1；
Fig. 5 is a kind of sectional structure principle of progressive die Screw thread process method of a specific embodiment according to the present invention
Schematic diagram.
Specific embodiment
For a clearer understanding of the technical characteristics, objects and effects of the present invention, this hair of Detailed description of the invention is now compareed
Bright specific embodiment.Wherein, identical component uses identical label.
Fig. 1 is a kind of principle schematic diagram of motor mounting shell；Fig. 2 is that the A-A revolved section structural principle of Fig. 1 shows
It is intended to；Fig. 3 is the B of Fig. 1 to visual angle schematic diagram；Fig. 5 is a kind of progressive die screw thread of a specific embodiment according to the present invention
The sectional structure schematic illustration of processing method.The working principle of provided tapping device in order to better illustrate the present invention,
Control simultaneously shows the water of four state of the tapping device used in method of the invention from die sinking to die closing process in Fig. 5
Flat partial cross principle schematic diagram and vertical component sectional structure schematic illustration, referring to shown in Fig. 1-3,5, the present invention is mentioned
A kind of progressive die Screw thread process method has been supplied, has been used in progressive die carry out screw thread process, the electricity to motor mounting shell 1
Motivation mounting shell 1 is the tubular construction of bottom opening, and side wall is provided with a horizontal threaded bore 11, and skirt 100 is provided with multiple
Through-hole 12 and step threaded hole 13, and 100 outer of skirt is provided with multiple notches, top surface is provided with mounting hole 14, kidney slot 15
And recessed portion 16, top surface are provided centrally with stepped hole 17, described method includes following steps
Step A, in progressive die provide a tapping device 5, the tapping device 5 it include mold and tapping under tapping
Upper mold, the tapping upper mold include passing through upper gas with the cope plate 201 of progressive die for compress positioning to blank
The upper compressing member 51 of spring 21 of moving connection, the driving screw rod 52 being fixedly connected with cope plate 201, the first nitrogen gas spring 54 and extremely
Few first pressure roller 310 ', mold includes the lower template 202 with progressive die for being positioned to blank under the tapping
The lower support element 53 being fixedly connected is being connect with lower template 202 by lower pneumatic spring 22 and can slide with the lower support element 53
The retainer plate 300 ' of dynamic connection, the side tapping pedestal 511 being fixedly connected with lower template 202 pass through Rectangular Spring with lower template 202
23 tapping supports 512 connecting and with 511 slidable connection of side tapping pedestal, the 300 ' bottom of retainer plate is fixed to be connected
It is connected at least one first drive screw 301, the lower template 202 is provided with set corresponding with first drive screw 301
It is equipped with the first transmission gear 501 of screwed hole of centre, for processing the first tapping screw tap 503 of the step threaded hole 13, institute
The first tapping screw tap 503 is stated to connect by the first driven wheel 502 with first transmission gear 501；The tapping support 512 is set
It is equipped with horizontally movable second tapping screw tap 513, the second tapping screw tap 513 is socketed in a first vertical gear 514
Interior, the first vertical gear 514 is engaged with a second vertical gear 515, and the second vertical gear 515 is same by one
The vertical bevel gear 516 of the first of axis is provided with the first level transmission gear 518 of coaxial first level bevel gear 517 with one
Connection, the first vertical bevel gear 516 engage with first level bevel gear 517, and the first level transmission gear 518 passes through one
Second intermediate gear 519 is engaged with second driving wheel 521, and second driving wheel 521 is provided centrally with and the active
The corresponding threaded hole of screw rod 52.
Step B, when material strip is sent to the tapping device 5 of step A offer in progressive die, tapping process is, when upper
Template 201 punching machine effect under run down when, upper compressing member 51 is contacted with blank top surface (i.e. material strip top surface), oppress blank to
Lower operation, that is to say to pass through first pressure roller 310 ' while oppressing retainer plate 300 and runs down, while the first nitrogen gas spring 54
It oppresses the tapping support 512 to run down, during running down, the driving screw rod 52 not will push described second and pass
Driving wheel 521 rotates.
After blank is inserted in lower support element 53, the retainer plate 300 is during running down, the first drive screw
301 to bottom offset can by the screwed hole of centre of the first transmission gear 501 drive the first transmission gear 501 rotation, thus through
The first tapping screw tap 503 is driven to rotate by the first driven wheel 502, blank continues to move downwards after contacting with the first tapping screw tap 503
It moves, that is, the opposite blank of the first tapping screw tap 503 moves upwards, so that the tapping of step threaded hole 13 is completed,
In this embodiment, the skirt 100 of motor mounting shell 1 is along the circumferential direction uniformly arranged there are four step spiral shell
Pit 13, therefore, the 300 ' bottom of retainer plate are fixedly connected there are two the first drive screw 301, and the lower template 202 is arranged
There are two the first transmission gear 501, each first transmission gear 501 is engaged with two the first driven wheels 502, that is, each the
One transmission gear 501 drives two the first tapping screw taps 503.
When the upper compressing member 51 is mobile in place, it that is to say that the upper compressing member 51 and the lower support element 53 are complete to blank
After stable holding, downwards completely into lower support element 53 and after being fixed, the lower pneumatic spring 22 stops blank (i.e. material strip)
It only deforms, the tapping support 512 also is moved into position and lower template 202 stops the relative displacement of vertical direction, at this point, on described
Pneumatic spring 21 continues to deform, that is, the cope plate 201 continues to be displaced, and first nitrogen gas spring 54 also continues to deform,
The driving screw rod 52 is pushed to move downward, the linear motion of the driving screw rod 52 drives the second driving wheel 521 to rotate, and according to
It is secondary via the second intermediate gear 519, the first level transmission gear 518, first level bevel gear 517, the first perpendicular straight-conical teeth
Wheel 516, the second vertical gear 515 drive the first vertical gear 514 to rotate, to be converted to the second tapping screw tap again
513 correspond to the horizontal rotation feed motion of 11 position of horizontal threaded bore on blank, to complete attacking to horizontal threaded bore 11
Tooth.
During the cope plate 201 is run up, the inverse operation of the above process is finally completed screw thread process operation.
It is 3 that the upper pneumatic spring, which can be quantity, and load can be 400 Ns, and the lower pneumatic spring 22 can be with
It is quantity is 4, load can be 1700 Ns, and it is 2 that first nitrogen gas spring 54, which can be quantity, and load can be
3200 Ns, it is 2 that the Rectangular Spring 23, which can be quantity, and load is 400 Ns.
A kind of progressive die Screw thread process method provided by the present invention is, it can be achieved that complete spiral shell in the punching course of progressive die
Line processing greatly reduces to be conducive to realize the manless production of high-precision motor rotor installation shell to pressman
And the demand of stamping equipment.Production efficiency greatly improves, remarkable in economical benefits.Simultaneously because eliminate manual operation etc. it is unstable because
Element influences, and improves product manufacturing precision and quality stability.
It will be appreciated by those skilled in the art that although the present invention is described in the way of multiple embodiments,
It is that not each embodiment only contains an independent technical solution.So narration is used for the purpose of for the sake of understanding in specification,
The skilled in the art should refer to the specification as a whole is understood, and by technical solution involved in each embodiment
Regard as and can be combined with each other into the modes of different embodiments to understand protection scope of the present invention.
The foregoing is merely the schematical specific embodiment of the present invention, the range being not intended to limit the invention.It is any
Those skilled in the art, made equivalent variations, modification and combination under the premise of not departing from design and the principle of the present invention,
It should belong to the scope of protection of the invention.
Claims (1)
1. a kind of progressive die Screw thread process method, which is characterized in that it is used in progressive die carry out spiral shell to motor mounting shell
Line processing, the motor mounting shell are the tubular construction of bottom opening, and side wall is provided with a horizontal threaded bore, skirt setting
There are a multiple through-holes and step threaded hole, and skirt outer is provided with multiple notches, top surface is provided with mounting hole, kidney slot and recessed
Concave portion, top surface are provided centrally with stepped hole, and described method includes following steps:
Step A, in progressive die provide a tapping device, the tapping device it include mold and tapping upper mold under tapping
Tool, the tapping upper mold include for carrying out compressing connecting with the cope plate of progressive die by upper pneumatic spring for positioning to blank
The upper compressing member connect, the driving screw rod being fixedly connected with cope plate, the first nitrogen gas spring and at least one first pressure roller are described
Mold includes the lower support element being fixedly connected with the lower template of progressive die for being positioned to blank under tapping, with lower template
Retainer plate being connected by lower pneumatic spring and with the lower support element slidable connection, the side being fixedly connected with lower template is attacked
Silk pedestal, tapping support being connect with lower template by Rectangular Spring and with the side tapping pedestal slidable connection are described
Retainer plate bottom is fixedly connected at least one first drive screw, and the lower template is provided with and first drive screw pair
That answers is provided with the first transmission gear of screwed hole of centre, described for processing the first tapping screw tap of the step threaded hole
First tapping screw tap is connect by the first driven wheel with first transmission gear；The tapping support is provided with horizontally moveable
The second tapping screw tap, the second tapping screw tap is socketed in a first vertical gear, the first vertical gear and one
A second vertical gear engagement, the second vertical gear are provided with by a first coaxial vertical bevel gear with one same
The first level transmission gear of the first level bevel gear of axis connects, and the first vertical bevel gear engages with first level bevel gear,
The first level transmission gear is engaged by second intermediate gear with second driving wheel, in second driving wheel
The heart is provided with threaded hole corresponding with the driving screw rod；
Step B, when material strip is sent to the tapping device of step A offer in progressive die, tapping process is, when cope plate exists
Under punching machine effect when running down, upper compressing member is contacted with blank top surface, is oppressed blank and is run down, and that is to say by described the
One pressure roller is oppressed retainer plate simultaneously and is run down, while the first nitrogen gas spring is oppressed the tapping support and run down, downward
In operational process, the driving screw rod not will push the second driving wheel rotation；
After blank is inserted in the lower support element, the retainer plate during running down, the first drive screw to bottom
The rotation of the first transmission gear can be driven by the screwed hole of centre of the first transmission gear by moving, to drive the via the first driven wheel
The rotation of one tapping screw tap, blank continues to move down after contacting with the first tapping screw tap, that is, the first tapping screw tap is with respect to base
Part moves upwards, so that the tapping of step threaded hole is completed,
When the upper compressing member is mobile in place, it that is to say that the upper compressing member and the lower support element complete stable holding to blank
Afterwards, blank is downwards completely into lower support element and after being fixed, and the lower pneumatic spring stops deformation, and the tapping support also moves
The dynamic relative displacement for stopping vertical direction with lower template in place, at this point, the upper pneumatic spring continues to deform, that is, it is described on
Template continues to be displaced, and first nitrogen gas spring also continues to deform, and pushes the driving screw rod to move downward, the driving screw rod
Linear motion drive the rotation of the second driving wheel, and successively via the second intermediate gear, the first level transmission gear, first
Horizontal bevel gear, the first vertical bevel gear, the second vertical gear drive the first vertical gear rotation, to be converted to institute again
The horizontal rotation feed motion that the second tapping screw tap corresponds to horizontal screw thread hole site on blank is stated, to complete to horizontal screw thread
The tapping in hole；
During the cope plate is run up, the inverse operation of the above process is finally completed screw thread process operation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711369976.6A CN107984039B (en) | 2017-12-19 | 2017-12-19 | A kind of progressive die Screw thread process method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711369976.6A CN107984039B (en) | 2017-12-19 | 2017-12-19 | A kind of progressive die Screw thread process method |
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| Publication Number | Publication Date |
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| CN107984039A CN107984039A (en) | 2018-05-04 |
| CN107984039B true CN107984039B (en) | 2019-05-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201711369976.6A Active CN107984039B (en) | 2017-12-19 | 2017-12-19 | A kind of progressive die Screw thread process method |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110834050A (en) * | 2018-12-31 | 2020-02-25 | 苏州市亿特隆科技有限公司 | Rapid stamping process of base |
| CN114618936A (en) * | 2020-12-14 | 2022-06-14 | 湖北美的电冰箱有限公司 | Continuous die and punch press |
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| CN203664505U (en) * | 2013-12-31 | 2014-06-25 | 慈溪市龙山汽配有限公司 | Motor outer shell progressive die |
| CN203725610U (en) * | 2014-01-13 | 2014-07-23 | 四川秦渝机电有限公司 | Progressive die for punching motor brush box left shell |
| CN203900256U (en) * | 2014-06-18 | 2014-10-29 | 苏州旭创精密模具有限公司 | Continuous mold for fasteners |
| CN205096656U (en) * | 2015-09-29 | 2016-03-23 | 苏州博赢精密模具有限公司 | A chasing bar for modulus of continuity |
| DE102015008049A1 (en) * | 2015-06-19 | 2016-12-22 | Wvl-Werkzeug- Und Vorrichtungsbau Lichtenstein Gmbh | Thread forming device on a punching and forming tool |
| CN206105382U (en) * | 2016-08-30 | 2017-04-19 | 亿和精密工业（苏州）有限公司 | Attack tooth mould in mould |
| CN206662054U (en) * | 2017-03-31 | 2017-11-24 | 苏州市桑林汽车配件有限公司 | Progressive die for stamping parts of automobile |
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2017
- 2017-12-19 CN CN201711369976.6A patent/CN107984039B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203664505U (en) * | 2013-12-31 | 2014-06-25 | 慈溪市龙山汽配有限公司 | Motor outer shell progressive die |
| CN203725610U (en) * | 2014-01-13 | 2014-07-23 | 四川秦渝机电有限公司 | Progressive die for punching motor brush box left shell |
| CN203900256U (en) * | 2014-06-18 | 2014-10-29 | 苏州旭创精密模具有限公司 | Continuous mold for fasteners |
| DE102015008049A1 (en) * | 2015-06-19 | 2016-12-22 | Wvl-Werkzeug- Und Vorrichtungsbau Lichtenstein Gmbh | Thread forming device on a punching and forming tool |
| CN205096656U (en) * | 2015-09-29 | 2016-03-23 | 苏州博赢精密模具有限公司 | A chasing bar for modulus of continuity |
| CN206105382U (en) * | 2016-08-30 | 2017-04-19 | 亿和精密工业（苏州）有限公司 | Attack tooth mould in mould |
| CN206662054U (en) * | 2017-03-31 | 2017-11-24 | 苏州市桑林汽车配件有限公司 | Progressive die for stamping parts of automobile |
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|---|---|
| CN107984039A (en) | 2018-05-04 |
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