CN105563019A - Manufacturing method of tuning self-locking screw - Google Patents
Manufacturing method of tuning self-locking screw Download PDFInfo
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- CN105563019A CN105563019A CN201510792763.9A CN201510792763A CN105563019A CN 105563019 A CN105563019 A CN 105563019A CN 201510792763 A CN201510792763 A CN 201510792763A CN 105563019 A CN105563019 A CN 105563019A
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 16
- 239000000463 material Substances 0.000 claims abstract description 37
- 238000003754 machining Methods 0.000 claims abstract description 12
- 238000000034 method Methods 0.000 claims description 31
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 26
- 229910052802 copper Inorganic materials 0.000 claims description 26
- 239000010949 copper Substances 0.000 claims description 26
- 238000006073 displacement reaction Methods 0.000 claims description 15
- 230000000694 effects Effects 0.000 abstract description 14
- 239000011295 pitch Substances 0.000 abstract 1
- 239000000047 product Substances 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 2
- 239000012467 final product Substances 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000003672 processing method Methods 0.000 description 2
- 238000007493 shaping process Methods 0.000 description 2
- 238000004026 adhesive bonding Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B35/00—Screw-bolts; Stay-bolts; Screw-threaded studs; Screws; Set screws
- F16B35/04—Screw-bolts; Stay-bolts; Screw-threaded studs; Screws; Set screws with specially-shaped head or shaft in order to fix the bolt on or in an object
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/20—Frequency-selective devices, e.g. filters
- H01P1/207—Hollow waveguide filters
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Forging (AREA)
Abstract
A manufacturing method of a tuning self-locking screw comprises the following steps of selecting materials; fixedly mounting a manufactured cold upsetting die on cold upsetting equipment; then placing a prepared blank in the cold upsetting die; starting the cold upsetting equipment; setting machining parameters of the cold upsetting equipment, wherein the machining parameters comprise machining temperature, speed and the like; adjusting cold upsetting pressure P of the cold upsetting equipment; starting to carry out cold upsetting machining on the blank; forming at one step during cold upsetting machining; carrying out thread machining on one end of a machined workpiece after cold upsetting machining is finished, wherein two sets of threads are arranged and are not connected, screw pitches P between the upper set of threads and the lower set of threads are the same, the diameters of the upper threads are greater than the diameters of the lower threads, and a part between the two threads is machined until the diameter of the part is 40%-70% of the diameter of a non-machined part of the workpieceafter thread machining is finished; and forming an accommodating groove in the top of one end of each thread after a step seven is finished. Compared with the traditional mode of machining with a numerically-controlled machine tool, the manufacturing method of the tuning self-locking screw saves equipment cost and labor cost, and is better in effect.
Description
Technical field
The present invention relates to signal transacting field, particularly relate to a kind of manufacture method of tuning Self-locking screw.
Background technology
At present, the signal transacting of cavity body filter has been come by the tuning Self-locking screw on filter cover board usually, the problem of tuning screw process is the problem of signal intermodulation in general, specifically refers to two different frequency signals, superposes and the signal of the new frequency of generation in a certain system.
The sheet material that current common filter lid board fabrication method adopts usually is pure copper material or the copper-plated metal material of surface electrical, cost is higher, what process mostly is the tuned window needing supporting tuning swivel nut, and add and mostly adopt man-hour the mode of punching press to process tuned window, impact style easily damages cover plate on the one hand, defect rate is higher, the tuned window processed on the other hand also needs to install tuning swivel nut in addition, tuning swivel nut adopts welding, press, the mode such as gluing is fixed on tuned window, the installation of tuning swivel nut not only needs cost of labor and processing cost, simultaneously, this tuning swivel nut installed additional in addition on tuned window is also unstable, just easily produce through after a period of time and loosen, and the also also out-of-flatness of the interface of tuned window and tuning swivel nut, the tuning effect that final impact is actual.
And when the blank material for screw carries out preparatory processing, usually need to use Digit Control Machine Tool to process, long processing time, take time and effort, and the cost of Digit Control Machine Tool itself is also very expensive, using Digit Control Machine Tool to process also can life-span of loss lathe, loses more than gain.
Summary of the invention
The present invention aims to provide a kind of manufacture method of tuning Self-locking screw.
For solving the problems of the technologies described above, by the following technical solutions, a kind of manufacture method of tuning Self-locking screw, comprises the following steps in the present invention:
Step one: selection, suitable blank material is chosen when considering cost and performance, blank adopts copper cylinder, and the diameter of blank material is selected according to the regulation of Self-locking screw, diameter >=the M4 of general Self-locking screw, the diameter 1mm larger than screw of blank material, fineness≤0.8 of copper periphery, make corresponding cold upsetting die of car according to dimensional requirement simultaneously, open cold-heading device power supply (DPS);
Step 2: the cold upsetting die of car made is fixedly mounted on cold-heading equipment, more ready blank material is put into cold upsetting die of car;
Step 3: start cold-heading equipment, set the machined parameters of cold-heading equipment, comprise processing temperature, speed etc., regulate the cold-heading pressure P of cold-heading equipment, this cold-heading pressure is determined according to selected blank material characteristic, blank volume and deflection;
Step 4: start to carry out carrying out cold-heading processing to blank material after the setting parameter of step 3 completes, cold-heading processing one-shot forming;
Step 5: after cold-heading machines, screw thread process is carried out to the workpiece one end processed, screw thread is provided with two covers, be not connected between two external threadings, the pitch P of upper and lower two external threadings is all identical, the diameter of upper screw thread is greater than the diameter of lower screw thread, and upper screw thread is 1.01:1-1.1:1 with the diameter ratio of lower screw thread, and the spacing between two screw threads is 0.1-2mm;
Step 7: after screw thread process completes, the part between two screw threads is machined to that its diameter is the undressed section diameter of workpiece 40%-70%;
Step 8: after step 7 completes, the receiving channel that screwdriver orders about screw is convenient in processing at the top, one end of screw thread.
As preferably, the copper material that step one is selected is H65.
As preferably, the Altitude control of the screw after machining is at 1-20mm.
As preferably, the receiving channel that step 8 processes is interior hexagonal shape, and screw head is evenly distributed with six grooves around the part of receiving channel and extends to receiving channel inside.
As preferably, upper screw thread and lower screw thread can produce a displacement in the axial direction, this displacement S is set as screw thread originally to the deviation that screw position under the position residing for downward-extension and reality produces, and the size controlling this displacement S when noting processing is 0.1P-0.8P.
Relative to traditional tuning screw processing method, the present invention adopts cold-heading equipment to carry out cold-heading processing to blank material, only need set pressure and other parameters, get final product cold-heading time processing shaping, ensure that product size precision and surface quality, equipment and human cost are saved, substantially reduce process time, can be mass-produced, the copper material that the present invention selects when selection is H65, neither too hard, nor too soft, its copper content also can meet tuning demand, copper material surface smoothness≤0.8 simultaneously, ensure the coefficient of friction of screw surface and filter cover board, guarantee self-locking effect, tuning effect can not be affected again simultaneously, and consider the regular size of Self-locking screw and the cooked mode of cold-heading, hair blank diameter 1mm larger than the screw processed, the present invention is provided with screw thread at the head of screw and forms screw in addition, this screw thread is provided with two covers, according to tuning range and the actual user demand of cavity body filter, diameter >=the M4 of the screw that screw thread of the present invention is formed, the Altitude control of corresponding screw is at 1-20mm, two external threadings of the present invention are not connected, because the present invention adopts copper to make screw, copper itself has good electric conductivity and ductility, two thread pitch P of the present invention's design are identical again, the diameter of upper screw thread is greater than the diameter of lower screw thread, upper screw thread is 1.01:1-1.1:1 with the diameter ratio of lower screw thread, because the diameter of upper and lower screw thread is different, screwdriver orders about the power that in screw screw-in cavity body filter process, screw head is subject to and is just no longer uniformly distributed, because two screw threads form a slight dislocation, such screwdriver drives screw to screw in screw head in the process of cavity body filter inside can produce slight deformation, because the power that screw head is subject to not is equally distributed, have certain departing from, and the screw thread of two dislocation can produce the cavity that the restoring force recovering original shape props up wave filter centered by the part between two screw threads after being subject to the extruding force of screwdriver, thus complete the self-locking of screw, upper screw thread and lower screw thread can produce a displacement in the axial direction, this displacement S is set as screw thread originally to the deviation that screw position under the position residing for downward-extension and reality produces, the size of described displacement S is 0.1P-0.8P, due to the existence of this side-play amount, the uneven of screwdriver urging force can be strengthened, simultaneously, consider actual self-locking effect, section diameter between screw thread is 40%-70% of bar portion diameter, because this section diameter has the danger of fracture time narrow, the restoring force of two screw threads has counteracting to a certain extent simultaneously, and this section diameter wide time two screw threads extruding forces of producing inadequate, self-locking DeGrain, in addition, the copper material that the present invention is used for manufacturing screw is H65, neither too hard, nor too soft, its copper content also can meet tuning demand, copper material fineness≤0.8, ensure the coefficient of friction of screw surface and filter cover board, guarantee self-locking effect, tuning effect can not be affected again simultaneously, consider height and the diameter of screw, spacing between two screw threads controls at 0.1-2mm, and the receiving channel of screw head is interior hexagonal shape, screw head is evenly distributed with six grooves around the part of receiving channel and extends to receiving channel inside, the top deformation of the more convenient screw of this shape is to obtain better self-locking effect.
Accompanying drawing explanation
Fig. 1 is flow chart of the present invention;
Fig. 2 is the structural representation of the product that the present invention manufactures.
Fig. 3 is the partial enlarged drawing of the product that the present invention manufactures;
Fig. 4 is the sectional view of the product that the present invention manufactures.
In figure: 1, head; 2, bar portion; 3, receiving channel; 4, screw thread; 41, upper screw thread; 42, lower screw thread.
Detailed description of the invention
Be described below in detail embodiments of the invention, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has element that is identical or similar functions from start to finish.Being exemplary below by the embodiment be described with reference to the drawings, only for explaining the present invention, and can not limitation of the present invention being interpreted as.
In describing the invention, unless otherwise prescribed and limit, it should be noted that, term " installation ", " being connected ", " connection " should be interpreted broadly, such as, can be mechanical connection or electrical connection, also can be the connection of two element internals, can be directly be connected, also indirectly can be connected by intermediary.For the ordinary skill in the art, the concrete meaning of above-mentioned term can be understood as the case may be.
Describe the manufacture method according to a kind of tuning Self-locking screw of the embodiment of the present invention referring to Fig. 1 to Fig. 4, comprise the following steps:
Step one: selection, suitable blank material is chosen when considering cost and performance, blank adopts copper cylinder, and the diameter of blank material is selected according to the regulation of Self-locking screw, diameter >=the M4 of general Self-locking screw, the diameter 1mm larger than screw of blank material, fineness≤0.8 of copper periphery, make corresponding cold upsetting die of car according to dimensional requirement simultaneously, open cold-heading device power supply (DPS);
Step 2: the cold upsetting die of car made is fixedly mounted on cold-heading equipment, more ready blank material is put into cold upsetting die of car;
Step 3: start cold-heading equipment, set the machined parameters of cold-heading equipment, comprise processing temperature, speed etc., regulate the cold-heading pressure P of cold-heading equipment, this cold-heading pressure is determined according to selected blank material characteristic, blank volume and deflection;
Step 4: start to carry out carrying out cold-heading processing to blank material after the setting parameter of step 3 completes, cold-heading processing one-shot forming;
Step 5: after cold-heading machines, screw thread process is carried out to the workpiece one end processed, screw thread 4 is provided with two covers, be not connected between two external threadings, the pitch P of upper and lower two external threadings is all identical, the diameter of upper screw thread 41 is greater than the diameter of lower screw thread 42, and upper screw thread 41 is 1.01:1-1.1:1 with the diameter ratio of lower screw thread 42, and the spacing between two screw threads is 0.1-2mm;
Step 7: after screw thread process completes, the part between two screw threads 4 is machined to that its diameter is the undressed section diameter of workpiece 40%-70%;
Step 8: after step 7 completes, the receiving channel 3 that screwdriver orders about screw is convenient in processing at the top, one end of screw thread 4.
As preferably, the copper material that step one is selected is H65.
As preferably, the Altitude control of the screw after machining is at 1-20mm.
As preferably, the receiving channel 3 that step 8 processes is interior hexagonal shape, and screw head is evenly distributed with six grooves around the part of receiving channel 3 and extends to receiving channel inside.
As preferably, upper screw thread 41 can produce a displacement in the axial direction with lower screw thread 42, this displacement S is set as the deviation that screw thread 41 originally produced to screw thread 42 position under the position residing for downward-extension and reality, and the size controlling this displacement S when noting processing is 0.1P-0.8P.
Relative to traditional tuning screw processing method, the present invention adopts cold-heading equipment to carry out cold-heading processing to blank material, only need set pressure and other parameters, get final product cold-heading time processing shaping, ensure that product size precision and surface quality, equipment and human cost are saved, substantially reduce process time, can be mass-produced, the copper material that the present invention selects when selection is H65, neither too hard, nor too soft, its copper content also can meet tuning demand, copper material surface smoothness≤0.8 simultaneously, ensure the coefficient of friction of screw surface and filter cover board, guarantee self-locking effect, tuning effect can not be affected again simultaneously, and consider the regular size of Self-locking screw and the cooked mode of cold-heading, hair blank diameter 1mm larger than the screw processed, the present invention is provided with screw thread at the head of screw and forms screw in addition, this screw thread is provided with two covers, according to tuning range and the actual user demand of cavity body filter, diameter >=the M4 of the screw that screw thread of the present invention is formed, the Altitude control of corresponding screw is at 1-20mm, two external threadings of the present invention are not connected, because the present invention adopts copper to make screw, copper itself has good electric conductivity and ductility, two thread pitch P of the present invention's design are identical again, the diameter of upper screw thread is greater than the diameter of lower screw thread, upper screw thread is 1.01:1-1.1:1 with the diameter ratio of lower screw thread, because the diameter of upper and lower screw thread is different, screwdriver orders about the power that in screw screw-in cavity body filter process, screw head is subject to and is just no longer uniformly distributed, because two screw threads form a slight dislocation, such screwdriver drives screw to screw in screw head in the process of cavity body filter inside can produce slight deformation, because the power that screw head is subject to not is equally distributed, have certain departing from, and the screw thread of two dislocation can produce the cavity that the restoring force recovering original shape props up wave filter centered by the part between two screw threads after being subject to the extruding force of screwdriver, thus complete the self-locking of screw, upper screw thread and lower screw thread can produce a displacement in the axial direction, this displacement S is set as screw thread originally to the deviation that screw position under the position residing for downward-extension and reality produces, the size of described displacement S is 0.1P-0.8P, due to the existence of this side-play amount, the uneven of screwdriver urging force can be strengthened, simultaneously, consider actual self-locking effect, section diameter between screw thread is 40%-70% of bar portion diameter, because this section diameter has the danger of fracture time narrow, the restoring force of two screw threads has counteracting to a certain extent simultaneously, and this section diameter wide time two screw threads extruding forces of producing inadequate, self-locking DeGrain, in addition, the copper material that the present invention is used for manufacturing screw is H65, neither too hard, nor too soft, its copper content also can meet tuning demand, copper material fineness≤0.8, ensure the coefficient of friction of screw surface and filter cover board, guarantee self-locking effect, tuning effect can not be affected again simultaneously, consider height and the diameter of screw, spacing between two screw threads controls at 0.1-2mm, and the receiving channel of screw head is interior hexagonal shape, screw head is evenly distributed with six grooves around the part of receiving channel and extends to receiving channel inside, the top deformation of the more convenient screw of this shape is to obtain better self-locking effect.
In the description of this description, specific features, structure, material or feature that the description of reference term " embodiment ", " example " or " some examples " etc. means to describe in conjunction with this embodiment or example are contained at least one embodiment of the present invention or example.In this manual, identical embodiment or example are not necessarily referred to the schematic representation of above-mentioned term.And the specific features of description, structure, material or feature can combine in an appropriate manner in any one or more embodiment or example.
Although illustrate and describe embodiments of the invention, those having ordinary skill in the art will appreciate that: can carry out multiple change, amendment, replacement and modification to these embodiments when not departing from principle of the present invention and aim, scope of the present invention is by claim and equivalents thereof.
Claims (5)
1. a manufacture method for tuning Self-locking screw, is characterized in that, comprises the following steps:
Step one: selection, suitable blank material is chosen when considering cost and performance, blank adopts copper cylinder, and the diameter of blank material is selected according to the regulation of Self-locking screw, diameter >=the M4 of general Self-locking screw, the diameter 1mm larger than screw of blank material, fineness≤0.8 of copper periphery, make corresponding cold upsetting die of car according to dimensional requirement simultaneously, open cold-heading device power supply (DPS);
Step 2: the cold upsetting die of car made is fixedly mounted on cold-heading equipment, more ready blank material is put into cold upsetting die of car;
Step 3: start cold-heading equipment, set the machined parameters of cold-heading equipment, comprise processing temperature, speed etc., regulate the cold-heading pressure P of cold-heading equipment, this cold-heading pressure is determined according to selected blank material characteristic, blank volume and deflection;
Step 4: start to carry out cold-heading processing to blank material after the setting parameter of step 3 completes, cold-heading processing one-shot forming;
Step 5: after cold-heading machines, screw thread process is carried out to the workpiece one end processed, screw thread is provided with two covers, be not connected between two external threadings, the pitch P of upper and lower two external threadings is all identical, the diameter of upper screw thread is greater than the diameter of lower screw thread, and upper screw thread is 1.01:1-1.1:1 with the diameter ratio of lower screw thread, and the spacing between two screw threads is 0.1-2mm;
Step 7: after screw thread process completes, the part between two screw threads is machined to that its diameter is the undressed section diameter of workpiece 40%-70%;
Step 8: after step 7 completes, the receiving channel that screwdriver orders about screw is convenient in processing at the top, one end of screw thread.
2. manufacture method according to claim 1, is characterized in that, the copper material that step one is selected is H65.
3. manufacture method according to claim 1, is characterized in that, the Altitude control of the screw after machining is at 1-20mm.
4. manufacture method according to claim 3, is characterized in that, the receiving channel that step 8 processes is interior hexagonal shape, and screw head is evenly distributed with six grooves around the part of receiving channel and extends to receiving channel inside.
5. manufacture method according to claim 1, it is characterized in that, upper screw thread and lower screw thread can produce a displacement in the axial direction, this displacement S is set as screw thread originally to the deviation that screw position under the position residing for downward-extension and reality produces, and the size controlling this displacement S when noting processing is 0.1P-0.8P.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510792763.9A CN105563019A (en) | 2015-11-18 | 2015-11-18 | Manufacturing method of tuning self-locking screw |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510792763.9A CN105563019A (en) | 2015-11-18 | 2015-11-18 | Manufacturing method of tuning self-locking screw |
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| Publication Number | Publication Date |
|---|---|
| CN105563019A true CN105563019A (en) | 2016-05-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510792763.9A Pending CN105563019A (en) | 2015-11-18 | 2015-11-18 | Manufacturing method of tuning self-locking screw |
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| Country | Link |
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| CN (1) | CN105563019A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107855729A (en) * | 2017-09-30 | 2018-03-30 | 武汉船用机械有限责任公司 | A kind of spin locking screw flight processing method |
| WO2024224294A1 (en) * | 2023-04-25 | 2024-10-31 | Mathys Ag Bettlach | Screw-in element having a lock against unscrewing, and corresponding assembly system and manufacturing method |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1999008009A1 (en) * | 1997-08-06 | 1999-02-18 | The Holistic Environment Creators Co., Ltd. | Self-locking screw and method for manufacturing the same |
| CN202839919U (en) * | 2012-09-13 | 2013-03-27 | 深圳市大富科技股份有限公司 | Cavity filter, tuning screw and self-locking screw |
| CN103398068A (en) * | 2013-07-29 | 2013-11-20 | 汕头经济特区超艺螺丝工业有限公司 | Multi-thread screw |
| CN203477014U (en) * | 2013-10-11 | 2014-03-12 | 胡平 | Tuning self-locking screw component |
| CN103827519A (en) * | 2011-07-05 | 2014-05-28 | 拜尔·米歇尔斯有限责任两合公司 | Thread-forming screw and screw connection, and blank for producing the screw |
| CN104152919A (en) * | 2014-08-22 | 2014-11-19 | 无锡市第二标准件制造有限公司 | Technology for manufacturing bolt |
-
2015
- 2015-11-18 CN CN201510792763.9A patent/CN105563019A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1999008009A1 (en) * | 1997-08-06 | 1999-02-18 | The Holistic Environment Creators Co., Ltd. | Self-locking screw and method for manufacturing the same |
| CN103827519A (en) * | 2011-07-05 | 2014-05-28 | 拜尔·米歇尔斯有限责任两合公司 | Thread-forming screw and screw connection, and blank for producing the screw |
| CN202839919U (en) * | 2012-09-13 | 2013-03-27 | 深圳市大富科技股份有限公司 | Cavity filter, tuning screw and self-locking screw |
| CN103398068A (en) * | 2013-07-29 | 2013-11-20 | 汕头经济特区超艺螺丝工业有限公司 | Multi-thread screw |
| CN203477014U (en) * | 2013-10-11 | 2014-03-12 | 胡平 | Tuning self-locking screw component |
| CN104152919A (en) * | 2014-08-22 | 2014-11-19 | 无锡市第二标准件制造有限公司 | Technology for manufacturing bolt |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107855729A (en) * | 2017-09-30 | 2018-03-30 | 武汉船用机械有限责任公司 | A kind of spin locking screw flight processing method |
| WO2024224294A1 (en) * | 2023-04-25 | 2024-10-31 | Mathys Ag Bettlach | Screw-in element having a lock against unscrewing, and corresponding assembly system and manufacturing method |
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Application publication date: 20160511 |
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