CN110524369B - Grinding process for shape of needle valve body of common rail oil nozzle - Google Patents
Grinding process for shape of needle valve body of common rail oil nozzle Download PDFInfo
- Publication number
- CN110524369B CN110524369B CN201910815636.4A CN201910815636A CN110524369B CN 110524369 B CN110524369 B CN 110524369B CN 201910815636 A CN201910815636 A CN 201910815636A CN 110524369 B CN110524369 B CN 110524369B
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- valve body
- needle valve
- grinding
- positioning
- head
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B15/00—Machines or devices designed for grinding seat surfaces; Accessories therefor
- B24B15/04—Machines or devices designed for grinding seat surfaces; Accessories therefor on valve members
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B41/00—Component parts such as frames, beds, carriages, headstocks
- B24B41/06—Work supports, e.g. adjustable steadies
- B24B41/061—Work supports, e.g. adjustable steadies axially supporting turning workpieces, e.g. magnetically, pneumatically
- B24B41/062—Work supports, e.g. adjustable steadies axially supporting turning workpieces, e.g. magnetically, pneumatically between centres; Dogs
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
Abstract
The invention relates to a common rail oil nozzle needle valve body shape grinding process, which comprises two steps of 1) head part forming grinding and 2) shape forming grinding, wherein the common rail oil nozzle needle valve body shape grinding process can finish the common rail oil nozzle needle valve body shape grinding by only two steps, so that the production efficiency is greatly improved, the labor intensity is reduced, the surface roughness is improved, burrs at a junction are effectively avoided, the whole shape surface texture is fine and consistent, and conditions are provided for subsequent clear laser marking.
Description
Technical Field
The invention relates to a grinding process of a needle valve body, in particular to a grinding process of the appearance of the needle valve body of a common rail oil nozzle.
Background
The appearance grinding process of traditional common rail glib needle valve body has been used for many years, and the product functional requirements such as appearance grinding needs to guarantee product function requirements such as the nodical position size of fuel sprayer oil spout, head intensity, wall thickness concentricity are considered to the process design principle, and traditional processing means is ordinary cylindrical grinder mostly simultaneously, therefore the process of design divides two sections: a, machining OP010 by a benchmark, grinding a process angle of 60 degrees, grinding a large excircle by OP020, and grinding a middle hole seat surface; b, final contour machining OP040 grinding middle outer circle and shoulder blade surface-OP 050 grinding small outer circle and inclined surface-OP 060 grinding ball head-OP 070 grinding chamfer, the size chain design is also designed on the basis of ensuring the position of the oil injection hole and the extension length of the oil nozzle ball head, a common cylindrical grinding machine is adopted, the final machining is performed by taking the seat surface and the middle hole as positioning references, and the process has the problems of low precision, multiple and complex processes, low efficiency, high labor consumption and the like.
Disclosure of Invention
The applicant researches and improves the defects and provides a process for grinding the shape of the needle valve body of the common rail oil nozzle.
The technical scheme adopted by the invention is as follows:
a common rail oil nozzle needle valve body shape grinding process comprises the following steps:
1) and (3) head forming and grinding: clamping a workpiece through a manipulator, inserting a middle hole of the needle valve body into a positioning core rod, and realizing radial positioning of the needle valve body by utilizing the excircle and the middle hole of the positioning core rod; then the head conical surface of the positioning core rod props against the seat surface of the needle valve body to realize the axial positioning of the needle valve body, then the pressing wheel presses the outer side of the big excircle of the needle valve body, and the driving part drives the pressing wheel to rotate so as to drive the needle valve body to rotate around the positioning core rod to complete the positioning and clamping; then, controlling two-axis interpolation through a program, and shaping and finishing a head grinding wheel by using a diamond pen arranged on a working table; the head grinding wheel which is finished in processing is inserted into a needle valve body which is positioned and rotated along the 60-degree oblique tangential direction through two shafts, and a ball head and a process angle of the needle valve body are ground through one-step molding of the head grinding wheel;
2) and (3) profile forming and grinding: the workpiece is placed at a clamping position through a manipulator, the head female center is fixed, the tail male center moves axially to clamp the workpiece, the head female center and the tail male center are matched to clamp the positioning needle valve body, a process angle of the needle valve body abuts against a positioning taper hole of the head female center to realize axial positioning, and a clamping taper surface of the tail male center abuts against an orifice of a hole in the needle valve body to realize radial positioning; the driving part drives the tail male center to rotate, the needle valve body is driven to overcome the friction force of the head female center through self-locking of a clamping conical surface of the tail male center and a middle hole of the needle valve body, the needle valve body is rotated, and positioning and clamping of the needle valve body are completed through the above modes; then, controlling two-axis interpolation through a program, and shaping and finishing an outline grinding wheel by using a diamond pen arranged on a working table; the trimmed profile grinding wheel is used for realizing one-step molding grinding of a large outer circle, a chamfer, a scapular surface, a middle outer circle, an inclined surface and a small outer circle of the needle valve body by interpolating the needle valve body which is positioned and rotated along the 60-degree oblique tangential direction through two shafts.
As a further improvement of the above technical solution:
the driving parts of the pinch roller and the tail male tip are driving motors.
The taper angle of the clamping conical surface is 8 degrees, and self-locking of the tail male center and the orifice of the middle hole of the needle valve body can be realized.
The taper angle of the positioning taper hole of the head female tip is 60 degrees, and the head female tip is positioned at the positioning taper hole and made of hard alloy.
The invention has the following beneficial effects: the common rail oil nozzle needle valve body appearance grinding process improves 6 original processes into 2 processes, greatly improves production efficiency, reduces labor intensity, improves surface roughness, effectively avoids boundary burrs, achieves fine and consistent whole appearance surface textures, and provides conditions for subsequent laser clear marking.
Drawings
Fig. 1 is a sectional view of a needle valve body of a common rail injector according to the present invention.
Fig. 2 is a schematic positioning diagram of the first step of the profile grinding process for the needle valve body of the common rail oil nozzle provided by the invention.
FIG. 3 is a schematic positioning diagram of the second step of the grinding process for the shape of the needle valve body of the common rail injector according to the present invention.
In the figure: 1. positioning the core rod; 2. a needle valve body; 21. a mesopore; 22. a seat surface; 23. a large outer circle; 24. a ball head; 25. a process corner; 26. chamfering; 27. scapular surface; 28. a middle outer circle; 29. a bevel; 210. a small outer circle; 3. partially grinding the grinding wheel; 4. a pinch roller; 5. the tail part is a male tip; 51. clamping the conical surface; 6. a head female center; 61. positioning the taper hole; 7. and grinding the appearance of the grinding wheel.
Detailed Description
The following describes a specific embodiment of the present embodiment with reference to the drawings.
As shown in fig. 1 to 3, as shown in fig. 1, the process for grinding the shape of the needle valve body of the common rail injector according to the present embodiment includes the following steps:
1) and (3) head forming and grinding: clamping a workpiece through a manipulator, inserting the middle hole 21 of the needle valve body 2 into the positioning core rod 1, and realizing radial positioning of the needle valve body 2 by utilizing the excircle of the positioning core rod 1 and the middle hole 21; then the conical surface of the head of the positioning core rod 1 props against the seat surface 22 of the needle valve body to realize the axial positioning of the needle valve body 2, then the pinch roller 4 compresses the outer side of the large excircle 23 of the needle valve body 2, and the drive motor drives the pinch roller 4 to rotate, so that the needle valve body 2 can be driven to rotate around the positioning core rod 1 to complete the positioning and clamping; then, controlling two-axis interpolation through a program, and shaping and finishing a head grinding wheel 3 by using a diamond pen arranged on a working table; the head grinding wheel 3 which is finished in processing is used for interpolating the needle valve body 2 which is positioned and rotated along the 60-degree oblique tangential direction through two shafts, and the ball head 24 and the process angle 25 of the needle valve body 2 are ground through one-step molding of the head grinding wheel 3;
2) and (3) profile forming and grinding: the workpiece is placed at a clamping position through a manipulator, the head female center 6 is fixed, the tail male center 5 moves axially to clamp the workpiece, the head female center 6 and the tail male center 5 are matched to clamp the positioning needle valve body 2, the process angle 25 of the needle valve body 2 abuts against a 60-degree positioning taper hole 61 made of hard alloy of the head female center 6 to achieve axial positioning, and the clamping conical surface 51 of the tail male center 5 abuts against an orifice of a hole 21 in the needle valve body 2 to achieve radial positioning; the driving motor drives the tail male center 5 to rotate, the clamping conical surface 51 and the middle hole 21 of the needle valve body 2 are self-locked through the clamping conical surface with the cone angle of 8 degrees of the tail male center 5, the needle valve body 2 is driven to overcome the friction force of the head female center 6, the needle valve body 2 is rotated, and the needle valve body 2 is positioned and clamped through the above modes; then, controlling two-axis interpolation through a program, and shaping and finishing the profile grinding wheel 7 by using a diamond pen arranged on a working table; the trimmed profile grinding wheel 7 is used for realizing one-step molding grinding of the large outer circle 23, the chamfer 26, the shoulder blade surface 27, the middle outer circle 28, the inclined surface 29 and the small outer circle 210 of the needle valve body 2 by interpolating the needle valve body 2 which is positioned and rotated along the 60-degree oblique tangential direction through two shafts.
The foregoing description is illustrative of the present invention and is not to be construed as limiting thereof, the scope of the invention being defined by the appended claims, which may be modified in any manner without departing from the basic structure thereof.
Claims (4)
1. A common rail oil nozzle needle valve body shape grinding process comprises the following steps:
1) and (3) head forming and grinding: clamping a workpiece through a manipulator, inserting a middle hole (21) of the needle valve body (2) into the positioning core rod (1), and realizing radial positioning of the needle valve body (2) by utilizing the excircle of the positioning core rod (1) and the middle hole (21); then the conical surface of the head of the positioning core rod (1) is propped against the seat surface (22) of the needle valve body to realize the axial positioning of the needle valve body (2), then the pinch roller (4) is used for pressing the outer side of the large excircle (23) of the needle valve body (2), and the drive part drives the pinch roller (4) to rotate so as to drive the needle valve body (2) to rotate around the positioning core rod (1) to finish the positioning and clamping; then, controlling two-axis interpolation through a program, and shaping and finishing a head grinding wheel (3) by using a diamond pen arranged on a working table; the head grinding wheel (3) which is finished during processing is used for interpolating the needle valve body (2) which is positioned and rotated along the 60-degree oblique tangential direction through two shafts, and a ball head (24) and a process angle (25) of the grinding needle valve body (2) are formed at one time through the head grinding wheel (3);
2) and (3) profile forming and grinding: the workpiece is placed at a clamping position through a manipulator, a head female center (6) is fixed, a tail male center (5) moves axially to clamp the workpiece, the head female center (6) and the tail male center (5) are matched to clamp the positioning needle valve body (2), a process angle (25) of the needle valve body (2) abuts against a positioning taper hole (61) of the head female center (6) to achieve axial positioning, and a clamping conical surface (51) of the tail male center (5) abuts against an orifice of a hole (21) in the needle valve body (2) to achieve radial positioning; the driving part drives the tail male center (5) to rotate, the needle valve body (2) is driven to overcome the friction force of the head female center (6) through self-locking of a clamping conical surface (51) of the tail male center (5) and a middle hole (21) of the needle valve body (2), the needle valve body (2) is rotated, and positioning and clamping of the needle valve body (2) are completed through the above modes; then, controlling two-axis interpolation through a program, and shaping and finishing an outline grinding wheel (7) by using a diamond pen arranged on a working table; the trimmed profile grinding wheel (7) is used for realizing one-step molding grinding of the large excircle (23), the chamfer (26), the scapular surface (27), the middle excircle (28), the bevel (29) and the small excircle (210) of the needle valve body (2) by interpolating the needle valve body (2) which is positioned and rotated along the 60-degree oblique tangential direction through two shafts.
2. The process for grinding the profile of the needle valve body of the common rail oil nozzle according to claim 1, wherein: and the driving parts of the pinch roller (4) and the tail male center (5) are driving motors.
3. The process for grinding the profile of the needle valve body of the common rail oil nozzle according to claim 1, wherein: the taper angle of the clamping conical surface (51) is 8 degrees, and the self-locking of the tail male tip (5) and the orifice of the middle hole (21) of the needle valve body (2) can be realized.
4. The process for grinding the profile of the needle valve body of the common rail oil nozzle according to claim 1, wherein: the taper angle of the positioning taper hole (61) of the head female center (6) is 60 degrees, and the head female center (6) is made of hard alloy at the position of the positioning taper hole (61).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910815636.4A CN110524369B (en) | 2019-08-30 | 2019-08-30 | Grinding process for shape of needle valve body of common rail oil nozzle |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910815636.4A CN110524369B (en) | 2019-08-30 | 2019-08-30 | Grinding process for shape of needle valve body of common rail oil nozzle |
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| Publication Number | Publication Date |
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| CN110524369A CN110524369A (en) | 2019-12-03 |
| CN110524369B true CN110524369B (en) | 2021-01-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910815636.4A Active CN110524369B (en) | 2019-08-30 | 2019-08-30 | Grinding process for shape of needle valve body of common rail oil nozzle |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116038563B (en) * | 2023-01-10 | 2024-05-14 | 一汽解放汽车有限公司 | Grinding tool for oil nozzle of oil sprayer |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102601730A (en) * | 2012-03-28 | 2012-07-25 | 常州博瑞油泵油嘴有限公司 | Precise positioning clamping device for needle valve of common-rail oil injector |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3740462A1 (en) * | 1987-11-28 | 1989-06-08 | Bosch Gmbh Robert | Method for finishing valve needles for fuel-injection nozzles |
| CN202399136U (en) * | 2011-12-14 | 2012-08-29 | 中国第一汽车股份有限公司无锡油泵油嘴研究所 | Clamp for grinding center hole and seat surface of needle valve body |
| CN202656065U (en) * | 2012-05-31 | 2013-01-09 | 烟台福尔精密机械有限公司 | Diamond roller of needle valve body |
| CN203293018U (en) * | 2013-05-31 | 2013-11-20 | 上海沪东造船油嘴油泵有限公司 | Oil atomizer needle valve body external grinding locating tool |
| CN104589210A (en) * | 2013-11-01 | 2015-05-06 | 烟台福尔精密机械有限公司 | Clamp for needle valve tail angle grinding |
| CN203726338U (en) * | 2014-02-28 | 2014-07-23 | 余建成 | Fixture for machining special-shaped nozzle needle valves |
| CN209125476U (en) * | 2018-09-28 | 2019-07-19 | 无锡威孚马山油泵油嘴有限公司 | A kind of oil nozzle needle-valve grinding fixture |
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- 2019-08-30 CN CN201910815636.4A patent/CN110524369B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102601730A (en) * | 2012-03-28 | 2012-07-25 | 常州博瑞油泵油嘴有限公司 | Precise positioning clamping device for needle valve of common-rail oil injector |
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| CN110524369A (en) | 2019-12-03 |
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