CN106694963A - Stepped boring and drilling compound cutter and boring and drilling processing technology thereof - Google Patents
Stepped boring and drilling compound cutter and boring and drilling processing technology thereof Download PDFInfo
- Publication number
- CN106694963A CN106694963A CN201710055104.6A CN201710055104A CN106694963A CN 106694963 A CN106694963 A CN 106694963A CN 201710055104 A CN201710055104 A CN 201710055104A CN 106694963 A CN106694963 A CN 106694963A
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- boring
- cutter
- hole
- boring cutter
- stepped hole
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B51/00—Tools for drilling machines
- B23B51/08—Drills combined with tool parts or tools for performing additional working
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B27/00—Tools for turning or boring machines; Tools of a similar kind in general; Accessories therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B35/00—Methods for boring or drilling, or for working essentially requiring the use of boring or drilling machines; Use of auxiliary equipment in connection with such methods
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Drilling Tools (AREA)
Abstract
The invention relates to a stepped boring and drilling composite cutter, which comprises a cutter body consisting of a drill bit and a cutter bar, and is characterized in that the drill bit is arranged at the bottom of a cutter head of the cutter body, and the drill bit corresponds to and is used for machining a small hole of a workpiece to be machined; the cutter bar comprises a front composite cutter body and a rear composite cutter body, and a first boring cutter and a second boring cutter for boring a first step hole and a second step hole of the workpiece to be machined are sequentially arranged on the front composite cutter body; the rear-end composite cutter body is formed by combining a third boring cutter, a fourth boring cutter and a fifth boring cutter which are used for machining a third step hole, a fourth step hole and a fifth step hole of the workpiece to be machined. The compound cutter of the invention compounds 6 cutters on one cutter, saves the time for changing cutters and moving a machine tool, and can improve the position precision of holes, thereby saving the working time, reducing the investment of equipment, and greatly improving the production efficiency and reducing the cost.
Description
Technical field
The present invention relates to NC cutting tool technical field of structures, specifically, a kind of the compound of stepped bore+drilling is relate to
Cutter, and a kind of processing technology implemented based on the cutter.
Background technology
At present, for Digit Control Machine Tool, the time that cutter is typically necessary several seconds is changed, and during processing, cutter is also needed to
The mobile time.Drilling is needed some planes where having multilayer steps hole and stepped hole are processed, each stepped hole needs one
Borer, the aperture at plane also wants independent one cutter, if hole needs chamfering, also needs to increase by one chamfering
Knife, the overlap for removing hole.
Therefore, in normal digital control processing operation, we generally require that cutter one could be completed by two or three
The processing of individual stepped hole, operates comparatively laborious, wastes time and energy, and processing efficiency is low.
The content of the invention
Present invention seek to address that the unitary function that existing NC cutting tool is present, and lathe needs repeatedly replacing cutter to bring
The inferior technological deficiency of inefficiency, and then provide and a kind of have that structure is simple and direct, multiple functional, lathe need to only change a knife
Compound tool is bored in the ladder boring for integrating the functions such as reaming, boring, chamfering of tool.Another object of the present invention is to, there is provided
A kind of processing technology that compound tool is bored based on above-mentioned boring.
To solve the above problems, the technical solution adopted in the present invention is：
Compound tool is bored in a kind of ladder boring, for being drilled and bore hole to workpiece to be processed S, including by drill bit 10 and knife bar 11
The cutter hub of composition, it is characterized in that, the drill bit 10 is installed on the cutter head bottom of the cutter hub, and the correspondence of the drill bit 10 is simultaneously
Aperture F for processing the workpiece to be processed；The knife bar 11 includes the compound cutter hub of the compound cutter hub in front end and rear end, it is described before
Workpiece to be processed first step hole A described in boring, first boring cutter 1 of second step hole B, the are sequentially installed with the compound cutter hub in end
Two boring cutters 2；The compound cutter hub in the rear end is by the 3rd stepped hole C, the 4th stepped hole D for processing the workpiece to be processed S
The 3rd boring cutter 3, the 4th boring cutter 4 and the 5th boring cutter 5 with the 5th stepped hole E are composited；The first step hole A, second
Rank hole B, the 3rd stepped hole C, the 4th stepped hole D and the 5th stepped hole E are the shoulder hole in coaxial difference footpaths, first boring cutter 1,
Second boring cutter 2, the 3rd boring cutter 3, the 4th boring cutter 4 and the stepped structure of the 5th boring cutter 5 are laid on the knife bar 11.
The first step hole A of the workpiece to be processed S is minimum aperture, is processed by the knife bar the first boring cutter 1 foremost；
Second step hole B is provided with the reverse side of the first step hole A, is added by second boring cutter 2 adjacent with first boring cutter 1
Work；
Sequentially it is provided with from inside to outside respectively by the 3rd boring cutter according to ascending aperture in the opposite side of the first step hole A
3rd, the 4th boring cutter 4 and the 3rd stepped hole C, the 4th stepped hole D and the 5th stepped hole E of the correspondence processing of the 5th boring cutter 5；
In order to process the second step hole B of the workpiece to be processed S, it is reserved with the knife bar 11 and allows knife space K3, it is described to allow
Knife space K3 is located between the boring cutter 3 of second boring cutter 2 and the 3rd；
The 5th stepped hole E is chamfered bore；
The material that the cutter hub is used is Cr12MoV；
The drill bit uses hard alloy non-standard component；
First boring cutter 1, the second boring cutter 2, the 3rd boring cutter 3, the 4th boring cutter 4 and the 5th boring cutter 5 are sequentially welded on the knife bar
On 11；
The drill bit 10 is bolted and is installed in the mounting hole that the cutter head bottom opens up；
In order to reduce cutting force so that the hole for processing more is stablized, first boring cutter 1, the second boring cutter 2, the 3rd boring cutter
3rd, the blade of the 4th boring cutter 4 and the 5th boring cutter 5 is PCD materials, and whole cutter hub needs to be G=6.3mm/s, and n=5000RPM's is dynamic flat
Weighing apparatus；
It is described to allow knife space K3 to should be greater than second step hole B bottom holes to described for the ease of second step hole described in tool sharpening
The distance between workpiece to be processed S upper surfaces L2；The axial distance K2 of the second boring cutter 2 should be greater than the depth L1 of second step hole B；
In order to ensure the dimensional accuracy of the first step hole A of minimum, the diameter of axle of second boring cutter 2 is 3. less than the first boring cutter 2
The diameter of axle is 2.；
In order to meet the depth of processing step, the depth L4 of the axial distance K5 and the 4th stepped hole D of the 4th boring cutter 4
Identical, distance is L3, the workpiece to be processed S between the bottom hole of the workpiece to be processed S upper surfaces to the 3rd stepped hole C
Upper surface to the distance between the bottom hole of the 4th stepped hole 4 is L4, and the axial distance K4 of the 3rd boring cutter 3 is equal to L3-L4；
In order to be able to meet the diametric requirements of stepped hole, 2. the diameter of axle of first boring cutter 2 is equal to the diameter of first step hole A, institute
4. the diameter of axle for stating the 3rd boring cutter is equal to the diameter of the 3rd stepped hole C；5. the diameter of axle of the 4th boring cutter 4 is equal to the 4th stepped hole D
Diameter.
Processing technology is bored in the boring that compound tool is bored in a kind of above-mentioned ladder boring, and it is characterized in that, including work in detail below
Skill step：
Step one：Machining small F
The drill bit 10 that compound tool end is bored in ladder boring is directed at the precalculated position of workpiece to be processed S, machining small F is machined to
When making a reservation for small hole depth L5, withdrawing；
Step 2：Processing first step hole
The center that compound tool is moved to workpiece to be processed S stepped holes, processing first step hole A are bored in ladder boring；
Step 3, processing second step hole
Compound tool is bored in ladder boring and moves to second step hole bottom hole to the distance between workpiece to be processed upper surface L2
Put, then the second boring cutter bias is moved to and first step hole A inner wall positions；Composite cutter starts the axis with stepped hole as the center of circle,
(B- The size of)/2 is radius, does circular interpolation, processes second step hole B；
Step 3, the remaining stepped hole of processing
Ladder boring bores compound tool by backtracking to the center of circle of stepped hole, and the 3rd stepped hole C, the 4th stepped hole D are processed successively
With the 5th stepped hole E；Last withdrawing, completion of processing！
Compound tool is bored in a kind of ladder boring of the invention, solves the unitary function that existing NC cutting tool is present, and lathe is needed
The inferior technical problem of inefficiency that cutter brings repeatedly is changed, 6 cutters are compounded in one by compound tool of the invention
The time on cutter, saving tool changing and machine tool movement, and the positional precision in hole can be improved, thus save the working time and
The input of reduction equipment, can greatly improve production efficiency and reduce cost.
Brief description of the drawings
Fig. 1：Stepped bore of the invention+drilling compound tool structural representation；
Fig. 2：Stepped bore of the invention+drilling compound tool scale diagrams；
Fig. 3：Need the schematic diagram of the stepped hole of processing；
Fig. 4：Stepped bore+drilling compound tool bore state structural representation；
Fig. 5：Stepped bore+drilling compound tool boring stepped hole A condition structural representation；
Fig. 6：Stepped bore+drilling compound tool boring stepped hole B state structural representation；
Fig. 7：Stepped bore+drilling compound tool boring stepped hole C, D, E-state structural representation；
Fig. 8：Stepped bore+boring cutter of drilling compound tool second and second step hole site top view；
In figure, the 1, first boring cutter, the 2, second boring cutter, the 3, the 3rd boring cutter, the 4, the 4th boring cutter, the 5, the 5th boring cutter, A, first step
Hole, B, second step hole, C, the 3rd stepped hole, D, the 4th stepped hole, E, the 5th stepped hole, F, aperture, workpiece to be processed, 9, spiral shell
Bolt, 10, drill bit, 11, knife bar, L1, second step hole depth, L2, second step hole bottom hole to the workpiece to be processed upper surface
The distance between, distance between L3, the bottom hole of workpiece to be processed upper surface to the 3rd stepped hole, on L4, workpiece to be processed
End face the distance between to the 4th stepped hole bottom hole, L5, small hole depth, K1, the length of the bit, K2, the axial direction of the second boring cutter
Distance, K3, allows knife space, K4, the axial distance of the 3rd boring cutter, K5, the axial distance of the 4th boring cutter, 1., hole diameter, 2.,
The diameter of axle of the first boring cutter, 3., the diameter of axle of the second boring cutter, 4., the diameter of axle of the 3rd boring cutter, 5., the diameter of axle of the 4th boring cutter.
Specific embodiment
Compound tool is bored to a kind of ladder boring of the invention with regard to accompanying drawing 1-8 below to be described in detail below.
Embodiment 1
Compound tool is bored in a kind of ladder boring, for being drilled and bore hole to workpiece to be processed S, including by drill bit 10 and knife bar 11
The cutter hub of composition, the drill bit 10 is installed on the cutter head bottom of the cutter hub, and the drill bit 10 is corresponding and for processing described treating
Process the aperture F of workpiece；The knife bar 11 includes the compound cutter hub of the compound cutter hub in front end and rear end, on the compound cutter hub in the front end according to
It is secondary that workpiece to be processed first step hole A described in boring, first boring cutter 1 of second step hole B, the second boring cutter 2 are installed；After described
The compound cutter hub in end is by the 3rd stepped hole C, the 4th stepped hole D and the 5th stepped hole E for processing the workpiece to be processed S
3rd boring cutter 3, the 4th boring cutter 4 and the 5th boring cutter 5 are composited；The first step hole A, second step hole B, the 3rd stepped hole
C, the 4th stepped hole D and the 5th stepped hole E are the shoulder hole in coaxial difference footpath, first boring cutter 1, the second boring cutter 2, the 3rd boring
Knife 3, the 4th boring cutter 4 and the stepped structure of the 5th boring cutter 5 are laid on the knife bar 11.
The first step hole A of the workpiece to be processed S is minimum aperture, is processed by the knife bar the first boring cutter 1 foremost；
Second step hole B is provided with the reverse side of the first step hole A, is added by second boring cutter 2 adjacent with first boring cutter 1
Work；Sequentially it is provided with from inside to outside respectively by the 3rd boring cutter according to ascending aperture in the opposite side of the first step hole A
3rd, the 4th boring cutter 4 and the 3rd stepped hole C, the 4th stepped hole D and the 5th stepped hole E of the correspondence processing of the 5th boring cutter 5；In order to process
The second step hole B of the workpiece to be processed S, is reserved with the knife bar 11 and allows knife space K3, described to allow knife space K3 to be located at
Between the boring cutter 3 of second boring cutter 2 and the 3rd；The 5th stepped hole E is chamfered bore；
The material that the cutter hub is used is Cr12MoV；The drill bit uses hard alloy non-standard component；
First boring cutter 1, the second boring cutter 2, the 3rd boring cutter 3, the 4th boring cutter 4 and the 5th boring cutter 5 are sequentially welded on the knife bar
On 11；The drill bit 10 is fixedly installed in the mounting hole that the cutter head bottom opens up by bolt 9；
In order to reduce cutting force so that the hole for processing more is stablized, first boring cutter 1, the second boring cutter 2, the 3rd boring cutter
3rd, the blade of the 4th boring cutter 4 and the 5th boring cutter 5 is PCD materials, and whole cutter hub needs to be G=6.3mm/s, and n=5000RPM's is dynamic flat
Weighing apparatus；It is described to allow knife space K3 to should be greater than second step hole B bottom holes to be treated to described for the ease of second step hole described in tool sharpening
The distance between processing workpiece S upper surfaces L2；The axial distance K2 of the second boring cutter 2 should be greater than the depth L1 of second step hole B；
In order to ensure the dimensional accuracy of the first step hole A of minimum, the diameter of axle of second boring cutter 2 is 3. less than the first boring cutter 2
The diameter of axle is 2.；In order to meet the depth of processing step, the depth of the axial distance K5 and the 4th stepped hole D of the 4th boring cutter 4
L4 is identical for degree, and distance is L3 between the bottom hole of the workpiece to be processed S upper surfaces to the 3rd stepped hole C, described to be processed
Workpiece S upper surfaces to the distance between the bottom hole of the 4th stepped hole 4 is L4, and the axial distance K4 of the 3rd boring cutter 3 is equal to
L3-L4；In order to be able to meet the diametric requirements of stepped hole, 2. the diameter of axle of first boring cutter 2 is equal to the diameter of first step hole A,
The diameter of axle of the 3rd boring cutter diameter 4. equal to the 3rd stepped hole C；5. the diameter of axle of the 4th boring cutter 4 is equal to the 4th stepped hole
The diameter of D.
It is below the process description to workpiece to be processed S：
In figure 3, it would be desirable to which the stepped hole of processing is respectively first step hole A, second step hole B, the 3rd stepped hole C,
Four stepped hole D, the 5th stepped hole E and aperture F.We first with drill bit machining small F, be machined to make a reservation for small hole depth L5 when,
Withdrawing；Composite cutter is moved to the center of workpiece to be processed S stepped holes, starts to process first step hole A, see Fig. 4；
Composite cutter is moved to second step hole bottom hole to the distance between workpiece to be processed upper surface L2 positions, then second
Boring cutter bias move to first step hole A inner wall positions, see Fig. 8, the 1st step, composite cutter starts the axis with stepped hole as the center of circle,
(B-The size of)/2 is radius, does circular interpolation, processes second step hole B, sees Fig. 8, the 2nd step;Then it is former by the 1st step
Road is back to the center of circle of stepped hole, then processes the 3rd stepped hole C, the 4th stepped hole D and the 5th stepped hole E；Last withdrawing, plus
Work is finished.
Claims (10)
1. compound tool is bored in a kind of ladder boring, for being drilled to workpiece to be processed and bore hole, including by drill bit and knife bar structure
Into cutter hub, it is characterised in that the drill bit is installed on the cutter head bottom of the cutter hub, the drill bit correspondence and for processing
State the aperture of workpiece to be processed；The knife bar includes the compound cutter hub of the compound cutter hub in front end and rear end, on the compound cutter hub in the front end
It is sequentially installed with workpiece to be processed first step hole described in boring, first boring cutter in second step hole, the second boring cutter；The rear end
Compound cutter hub is by the 3rd boring of the 3rd stepped hole, the 4th stepped hole and the 5th stepped hole for processing the workpiece to be processed
Knife, the 4th boring cutter and the 5th boring cutter are composited；The first step hole, second step hole, the 3rd stepped hole, the 4th stepped hole
With the shoulder hole that the 5th stepped hole is coaxial difference footpaths, first boring cutter, the second boring cutter, the 3rd boring cutter, the 4th boring cutter and the
The stepped structure of five boring cutters is laid on the knife bar.
2. compound tool is bored in a kind of ladder boring as claimed in claim 1, is characterised by
The first step hole of the workpiece to be processed is minimum aperture, is processed by the knife bar the first boring cutter foremost；Described
The reverse side in first step hole is provided with second step hole, is processed by second boring cutter adjacent with first boring cutter；
Opposite side in the first step hole be sequentially provided with from inside to outside according to ascending aperture respectively by the 3rd boring cutter,
4th boring cutter and the 3rd stepped hole of the 5th boring cutter correspondence processing, the 4th stepped hole and the 5th stepped hole.
3. compound tool is bored in a kind of ladder boring as claimed in claim 4, is characterised by
It is reserved with the knife bar and allows knife space, it is described to allow knife to be spatially located between second boring cutter and the 3rd boring cutter；It is described
5th stepped hole is chamfered bore.
4. compound tool is bored in a kind of ladder boring as claimed in claim 3, is characterised by
The material that the cutter hub is used is Cr12MoV；The drill bit uses hard alloy non-standard component.
5. compound tool is bored in a kind of ladder boring as claimed in claim 4, is characterised by
First boring cutter, the second boring cutter, the 3rd boring cutter, the 4th boring cutter and the 5th boring cutter are sequentially welded on the knife bar；Institute
State drill bit and be bolted and be installed in the mounting hole that the cutter head bottom opens up.
6. compound tool is bored in a kind of ladder boring as claimed in claim 5, is characterised by
The blade of first boring cutter, the second boring cutter, the 3rd boring cutter, the 4th boring cutter and the 5th boring cutter is PCD materials, whole cutter hub
Need to be G=6.3mm/s, the dynamic balancing of n=5000RPM.
7. compound tool is bored in a kind of ladder boring as claimed in claim 6, is characterised by
It is described to allow knife space to should be greater than second step hole bottom hole the distance between to the workpiece to be processed upper surface；Second boring cutter
Axial distance should be greater than the depth in second step hole.
8. compound tool is bored in a kind of ladder boring as claimed in claim 7, is characterised by
The diameter of axle of the diameter of axle of second boring cutter less than the first boring cutter.
9. compound tool is bored in a kind of ladder boring as claimed in claim 8, is characterised by
The axial distance of the 4th boring cutter is identical with the depth of the 4th stepped hole, the workpiece to be processed upper surface to institute
Distance is between stating the bottom hole of the 3rd stepped hole（L3）, the workpiece to be processed upper surface is between the 4th stepped hole bottom hole
Distance be（L4）, the axial distance of the 3rd boring cutter is equal to（L3）-（L4）；
The diameter of axle of first boring cutter is equal to the diameter in first step hole, and the diameter of axle of the 3rd boring cutter is equal to the 3rd stepped hole
Diameter；The diameter of axle of the 4th boring cutter is equal to the diameter of the 4th stepped hole.
10. the boring brill processing technology of compound tool is bored in any ladder borings of a kind of claim 1-9, it is characterised in that including following
Concrete technology step：
Step one：Machining small
The drill bit that compound tool end is bored in ladder boring is directed at the precalculated position of workpiece to be processed, machining small is machined to make a reservation for
During small hole depth, withdrawing；
Step 2：Processing first step hole
The center that compound tool is moved to workpiece to be processed stepped hole, processing first step hole are bored in ladder boring；
Step 3, processing second step hole
Compound tool is bored in ladder boring and moves to second step hole bottom hole the distance between to the workpiece to be processed upper surface（L2）
Position, then the second boring cutter bias is moved to and first step hole inner wall position；Composite cutter starts the axis with stepped hole as the center of circle,
(B-The size of)/2 is radius, does circular interpolation, processes second step hole；
Step 3, the remaining stepped hole of processing
Ladder boring bores compound tool by backtracking to the center of circle of stepped hole, process successively the 3rd stepped hole, the 4th stepped hole and
5th stepped hole；Last withdrawing, completion of processing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710055104.6A CN106694963B (en) | 2017-01-24 | 2017-01-24 | Stepped boring and drilling compound cutter and boring and drilling processing technology thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710055104.6A CN106694963B (en) | 2017-01-24 | 2017-01-24 | Stepped boring and drilling compound cutter and boring and drilling processing technology thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106694963A true CN106694963A (en) | 2017-05-24 |
| CN106694963B CN106694963B (en) | 2019-05-10 |
Family
ID=58909636
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710055104.6A Active CN106694963B (en) | 2017-01-24 | 2017-01-24 | Stepped boring and drilling compound cutter and boring and drilling processing technology thereof |
Country Status (1)
| Country | Link |
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| CN (1) | CN106694963B (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107671327A (en) * | 2017-09-30 | 2018-02-09 | 广东星光传动股份有限公司 | A kind of compound tool and box body of speed reducer |
| CN108747219A (en) * | 2018-06-02 | 2018-11-06 | 山东富祥动力股份有限公司 | A kind of stepped hole method for fine finishing |
| CN108971519A (en) * | 2018-09-18 | 2018-12-11 | 中船动力有限公司 | Cylinder of diesel engine bottom bolts hole back side mounting surface scrapes quadratic method |
| CN110014267A (en) * | 2019-03-28 | 2019-07-16 | 二重（德阳）重型装备有限公司 | Large-scale bend pipe processing method |
| CN110153473A (en) * | 2018-01-15 | 2019-08-23 | 吴江市亨达机械配件有限责任公司 | It is machined dedicated tool and its application method |
| CN110193703A (en) * | 2019-06-19 | 2019-09-03 | 哈尔滨汽轮机厂有限责任公司 | A kind of high-precision processing method of connecting shaft |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107671327A (en) * | 2017-09-30 | 2018-02-09 | 广东星光传动股份有限公司 | A kind of compound tool and box body of speed reducer |
| CN110153473A (en) * | 2018-01-15 | 2019-08-23 | 吴江市亨达机械配件有限责任公司 | It is machined dedicated tool and its application method |
| CN108747219A (en) * | 2018-06-02 | 2018-11-06 | 山东富祥动力股份有限公司 | A kind of stepped hole method for fine finishing |
| CN108971519A (en) * | 2018-09-18 | 2018-12-11 | 中船动力有限公司 | Cylinder of diesel engine bottom bolts hole back side mounting surface scrapes quadratic method |
| CN110014267A (en) * | 2019-03-28 | 2019-07-16 | 二重（德阳）重型装备有限公司 | Large-scale bend pipe processing method |
| CN110014267B (en) * | 2019-03-28 | 2020-06-23 | 二重（德阳）重型装备有限公司 | Large-scale bent pipe machining method |
| CN110193703A (en) * | 2019-06-19 | 2019-09-03 | 哈尔滨汽轮机厂有限责任公司 | A kind of high-precision processing method of connecting shaft |
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|---|---|
| CN106694963B (en) | 2019-05-10 |
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Address after: 264500 No.2, Kaifa Third Road, Rushan economic and Technological Development Zone, Weihai City, Shandong Province Patentee after: Weihai Bethel automobile safety system Co.,Ltd. Address before: 264500 No.2, Kaifa Third Road, Rushan economic and Technological Development Zone, Weihai City, Shandong Province Patentee before: WEIHAI BETHEL SAKEDI AUTOMOTIVE SAFETY SYSTEMS CO.,LTD. |