CN111660071A - Processing technology of EGR (exhaust gas recirculation) flange - Google Patents

Processing technology of EGR (exhaust gas recirculation) flange Download PDF

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Publication number
CN111660071A
CN111660071A CN202010612465.8A CN202010612465A CN111660071A CN 111660071 A CN111660071 A CN 111660071A CN 202010612465 A CN202010612465 A CN 202010612465A CN 111660071 A CN111660071 A CN 111660071A
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China
Prior art keywords
clamp
face
flange
point
egr
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Granted
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CN202010612465.8A
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CN111660071B (en
Inventor
薛敏海
魏清亮
乔月忠
陈心威
陈明伟
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Zhanjiang Deni Vehicle Parts Co ltd
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Zhanjiang Deni Vehicle Parts Co ltd
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    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q3/00—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine

Abstract

The invention discloses a processing technology of an EGR flange, which comprises the following steps: s1, providing an EGR flange blank; s2, clamping the EGR flange blank by using a clamp; after the clamp is installed, machining a first flange face, two pin holes and a stepped hole, turning over the clamp, machining the end faces of the pin holes and the end faces of the stepped hole, and removing parting burrs in the channel; processing a third flange surface and two second threaded through holes; s2, adjusting the clamp, and processing a third flange surface and two first threaded through holes; s4, adjusting the clamp, and clamping from the first end face and the back face of the first end face by taking the stepped hole and the pin hole as clamp positioning holes; processing a second flange surface and two first threaded through holes; s5, carrying out laser marking; s6, cleaning the machined part; s7, installing corresponding pin columns on the two pin holes; s8, performing a sealing test and marking on the machined part; s9, appearance inspection; and S10, packaging. The processing technology of the EGR flange has reasonable process arrangement and reasonable positioning and clamping layout, and ensures the processing precision and the processing efficiency.

Description

Processing technology of EGR (exhaust gas recirculation) flange
Technical Field
The invention belongs to the technical field of automobile part machining, and particularly relates to a machining process of an EGR flange.
Background
The EGR flange is provided with 3 flange surfaces which are a first flange surface, a second flange surface and a third flange surface respectively, a channel is arranged between the second flange surface and the third flange surface, the first flange surface is provided with two pin holes and a stepped hole, the stepped hole of one pin hole is coaxial, the second flange surface is provided with two first threaded through holes and a through hole of the channel, and the third flange surface is provided with two second threaded through holes and another through hole of the channel.
At present, in the machining process, a coordinate system is generally established by taking a first flange surface and a pin hole on the flange surface as a reference to be related to other machining parts, but the 3 parts as the reference are closer in distance, and other machining parts (such as a third flange surface) are farther from the reference, so that the conventional machining error is larger, and the product stability is lower.
Therefore, a new technology is needed to solve the problems of large processing error and low product stability in the prior art.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides the processing technology of the EGR flange, which is reasonable in process arrangement, reasonable in positioning and clamping layout and capable of ensuring processing precision and processing efficiency.
The invention adopts the following technical scheme:
a machining process of an EGR flange comprises the following steps:
s1, providing an EGR flange blank, wherein the EGR flange blank is provided with a first end face, a second end face and a third end face; two blank bottom holes are formed in the second end face; the third end surface is in a diamond shape, and two sides of the third end surface are provided with bulges; a channel is formed between the second end face and the third end face;
s2, taking the two blank bottom holes of the second end face as clamp positioning holes, clamping and fixing the clamp from the back faces of the second end face and the second end face, and clamping and fixing the clamp at bulges on two sides of a rhombus-shaped third end face; after the clamp is installed, processing the first end face into a first flange face, processing two pin holes and a stepped hole on the first flange face, turning over the clamp, processing the end faces of the pin holes and the end faces of the stepped hole on the back face of the first flange face, and removing parting burrs in the channel;
s3, adjusting a clamp, wherein the two blank bottom holes of the second end face are used as clamp positioning holes, the clamp is clamped and fixed from the back faces of the second end face and the second end face, and the clamp is also clamped and fixed at bulges on two sides of a rhombus-shaped third end face; after the clamp is installed, processing a third end surface into a third flange surface, and processing two second threaded through holes on the third flange surface;
s4, adjusting a clamp, wherein the stepped hole and the pin hole are used as clamp positioning holes, the clamp is clamped and fixed from the first flange surface and the back surface of the first flange surface, and the clamp is also protruded from two sides of the third flange surface to clamp and fix the workpiece; after the clamp is adjusted, processing the second end surface to form a second flange surface, and processing two first threaded through holes on the second flange surface;
s5, carrying out laser marking on the machined part;
s6, cleaning the machined part,
s7, installing corresponding pin columns on the two pin holes of the first flange surface;
s8, performing a sealing test on the workpiece and marking the sealing test;
s9, appearance inspection;
and S10, packaging.
As a further improvement of the technical solution of the present invention, in the step S2/S3, the point a and the point B on the second end face are used as the clamp pressing points of the clamp, and the point a and the point B corresponding to the point a and the point B on the back face of the second end face are used as the clamp rough positioning points of the clamp; the clamp takes a point C on a bulge on one side close to the third end surface as a clamp pressing point, and a point C corresponding to the point C on a bulge on the other side close to the third end surface as a clamp rough positioning point; the anchor clamps compress tightly the point through 3 thick locating points of anchor clamps and 3 anchor clamps and fix the EGR flange blank.
As a further improvement of the technical solution of the present invention, the point a, the point B and the point C are not on the same straight line.
As a further improvement of the technical solution of the present invention, in step S4, the fixture uses three points on the first flange surface as supporting points, and the fixture uses the end surface of the stepped hole as a pressing surface, and fixes the workpiece through 3 supporting points and the pressing surface.
As a further improvement of the technical scheme of the invention, 3 support points are not on the same straight line.
As a further improvement of the technical scheme of the invention, the clamp takes a point C on a bulge on one side close to the third flange surface as a secondary supporting point, and takes a point C corresponding to the point C on a bulge on the other side close to the third flange surface as a secondary pressing point.
As a further improvement of the technical scheme of the invention, the clamp is a buckling type pneumatic clamp or a buckling type hydraulic clamp.
As a further improvement of the present invention, in the step S2, the step S3, and the step S4, the tool for machining the first flange surface, the second flange surface, and the third flange surface is a PCD disc cutter.
As a further improvement of the technical solution of the present invention, the processing equipment adopted in the step S2, the step S3 and the step S4 is a numerical control processing center.
Compared with the prior art, the invention has the beneficial effects that:
in steps S2 and S3 of the present invention, the workpiece is clamped and positioned from the second end face and the back face thereof, so that the distance between each part and the reference is short in the machining process, and the machining error is small; in step S4, the distance between each part and the reference is appropriate and not too close when machining, the machining error is small, and the product stability is high, using the pin holes on the first end surface and the first end surface as the reference and the projections on both sides of the third end surface as the reference.
Drawings
The technology of the present invention will be described in further detail with reference to the accompanying drawings and detailed description below:
FIG. 1 is a schematic view of the pinch point of a clamp on a second flange face in the present invention;
FIG. 2 is a schematic view of a gross anchor point on the back of the second flange face in the present invention;
FIG. 3 is a cross-sectional view of the present invention removing parting flash in the channel;
FIG. 4 is a schematic illustration of three support points on the first flange face in the present invention;
FIG. 5 is a schematic view of the end face of the stepped bore of the present invention opposite the first flange face;
FIG. 6 is a schematic view of the present invention showing the installation of a pin in two pin holes in the first flange face.
Reference numerals:
100-EGR flange; 110-a first flange face; 111-pin holes; 112-a stepped bore; 113-a pin; 114-a support point; 120-a second flange face; 121-a first threaded through hole; 130-third flange flour; 131-a second threaded through hole; 140-a channel; 150-bump.
Detailed Description
The conception, the specific structure and the technical effects of the present invention will be clearly and completely described in conjunction with the embodiments and the accompanying drawings to fully understand the objects, the schemes and the effects of the present invention. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The same reference numbers will be used throughout the drawings to refer to the same or like parts.
It should be noted that, unless otherwise specified, when a feature is referred to as being "fixed" or "connected" to another feature, it may be directly fixed or connected to the other feature or indirectly fixed or connected to the other feature. Further, the description of the upper, lower, left, right, etc. used in the present invention is only with respect to the positional relationship of the respective components of the present invention with respect to each other in the drawings.
Referring to fig. 1 to 6, a machining process of an EGR flange includes the following steps:
s1, providing an EGR flange blank, wherein the EGR flange blank is provided with a first end face, a second end face and a third end face, and the first end face, the second end face and the third end face correspond to a first flange face 110, a second flange face 120 and a third flange face 130; two blank bottom holes are formed in the second end face; the third end surface is in a diamond shape, and protrusions 150 are arranged on two sides of the third end surface; the second end face and the third end face form a channel 140 therebetween. The EGR flange blank is substantially the same shape as the finished EGR flange 100, and the first, second, and third end faces are machined to form the first, second, and third flange faces 110, 120, 130. The back surface of the first end surface is a curved surface, the back surface of the second end surface is a curved surface, and the back surface of the third end surface is a curved surface and is connected with the outer wall of the channel 140. The third end is diamond-shaped and two protrusions 150 are formed on both sides thereof. The EGR flange blank is processed on the basis, and is more convenient.
S2, clamping a workpiece to be machined (namely an EGR flange blank) on a numerical control machining center by adopting a clamp, wherein during clamping, two blank bottom holes of the second end face are used as clamp positioning holes (the initial positioning function), the clamp is clamped and fixed from the back faces of the second end face and the second end face, and the clamp is also clamped and fixed at bulges 150 on two sides of a rhombus-shaped third end face. Namely, the workpiece is fixed from the second end surface, the back surface thereof and two sides of the third end surface, and the two sides of the third end surface and the back surfaces of the second end surface and the second end surface are basically positioned on two planes.
After the clamp is installed, a first end face is milled to form a first flange face 110, a first pin hole 111 and a stepped hole 112 are drilled in the first flange face 110, the pin hole 111 is hinged, a second pin hole 111 is drilled and hinged to form two pin holes 111 and two stepped holes 112, the clamp is turned over, the end face of the stepped hole 112 and the end face of the second pin hole 111 are milled on the back face of the first flange face 110, and chamfering edges of the pin holes 111 and the stepped holes 112 are scraped; the fixture is turned over to remove the parting burrs in the channel 140, and the machining of the first flange face 110 is substantially completed.
In step S2, the workpiece is clamped and positioned from the second end surface and the back surface thereof, so that the distance between each part and the reference is short during the machining process, and the machining error is small.
S3, adjusting a switching clamp, turning a workpiece, taking two blank bottom holes of the second end face as clamp positioning holes, clamping and fixing the clamp from the back faces of the second end face and the second end face, and clamping and fixing the clamp at bulges 150 on two sides of a rhombus-shaped third end face; after the jig is mounted, the third end surface is machined into a third flange surface 130, and two second threaded through holes 131 are machined in the third flange surface 130. The jig used in this step is substantially the same as that used in step S2, but since the workpiece is turned, the shape of the shape jig is adjusted in accordance with the workpiece.
Specifically, in the step S2/S3, the jig takes the points a and B on the second end face as jig pressing points, and the jig takes the points a and B corresponding to the points a and B on the back face of the second end face as jig rough positioning points; the clamp takes a point C on the bulge 150 on one side close to the third end surface as a clamp pressing point, and the clamp takes a point C on the bulge 150 on the other side close to the third end surface, corresponding to the point C, as a clamp rough positioning point; the anchor clamps compress tightly the point through 3 thick locating points of anchor clamps and 3 anchor clamps and fix the EGR flange blank. Wherein the point A, the point B and the point C are not on the same straight line. The workpiece is limited at one side by A, B, C three points, and the workpiece is limited at the other side by a, b and c three points, so that the workpiece is clamped. And the positioning is carried out by adopting the mode, the distance between the processing part and the reference surface is relatively short, and the processing error is small.
S4, adjusting a switching clamp, taking the stepped hole 112 and the pin hole 111 as clamp positioning holes, clamping and fixing the clamp from the first flange face 110 and the back face of the first flange face 110, and clamping and fixing the workpiece by the clamp from the protrusions 150 at the two sides of the third flange face; and after the fixture is adjusted, milling a second end face to form a second flange face 120, and reaming and tapping the bottom hole of the original threaded through hole on the second end face so as to machine two first threaded through holes 121 on the second flange face 120.
In step S4, the distance between each part and the reference is appropriate and not too close when machining, the machining error is small, and the product stability is high, using the pin hole 111 on the first end surface and the first end surface as the reference, and using the protrusions 150 on both sides of the third end surface as the reference.
In step S3, the jig uses three points on the first flange surface 110 as the supporting points 114, and the jig uses the end surface of the stepped hole 112 as the pressing surface, and fixes the workpiece by using 3 supporting points 114 and the pressing surface. The 3 support points 114 are not on the same straight line, but are staggered, and the three points form a surface to match with the end surface of the stepped hole 112 to clamp and fix the workpiece. Preferably, 3 supporting points 114 are distributed on the first flange surface 110 in an isosceles triangle shape, so that the stress is more uniform.
The fixture takes a point C on the protrusion 150 on one side close to the third flange surface as a secondary supporting point 114, and takes a point C on the protrusion 150 on the other side close to the third flange surface corresponding to the point C as a secondary pressing point. Point C and the three preceding support points 114 are located at each end of the workpiece and are fixed at both ends to stabilize the workpiece while ensuring that each location is not far from the datum.
And S5, carrying out laser marking on the machined part by using a laser marking machine.
S6, cleaning the machined part;
after S7 cleaning, corresponding pins 113 are mounted on the two pin holes 111 of the first flange surface.
And S8, carrying out 100% sealing test on the machined part by adopting an air tightness test bed and marking the sealing test.
And S9, checking the visual appearance of the product.
S10, packaging the product.
Specifically, the clamp is a buckling type pneumatic clamp or a buckling type hydraulic clamp. In the steps S2, S3, and S4, the tool for machining the first flange surface 110, the second flange surface 120, and the third flange surface 130 is a PCD disc cutter.
The processing technology of the EGR flange has the advantages of reasonable process arrangement, reasonable positioning and clamping layout and capability of ensuring the processing precision and the processing efficiency.
Other contents of the processing technology of the EGR flange are referred to in the prior art and are not described in detail herein.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, so that any modification, equivalent change and modification made to the above embodiment according to the technical spirit of the present invention are within the scope of the technical solution of the present invention.

Claims (9)

1. The machining process of the EGR flange is characterized by comprising the following steps of:
s1, providing an EGR flange blank, wherein the EGR flange blank is provided with a first end face, a second end face and a third end face; two blank bottom holes are formed in the second end face; the third end surface is in a diamond shape, and two sides of the third end surface are provided with bulges; a channel is formed between the second end face and the third end face;
s2, taking the two blank bottom holes of the second end face as clamp positioning holes, clamping and fixing the clamp from the back faces of the second end face and the second end face, and clamping and fixing the clamp at bulges on two sides of a rhombus-shaped third end face; after the clamp is installed, processing the first end face into a first flange face, processing two pin holes and a stepped hole on the first flange face, turning over the clamp, processing the end faces of the pin holes and the end faces of the stepped hole on the back face of the first flange face, and removing parting burrs in the channel;
s3, adjusting a clamp, wherein the two blank bottom holes of the second end face are used as clamp positioning holes, the clamp is clamped and fixed from the back faces of the second end face and the second end face, and the clamp is also clamped and fixed at bulges on two sides of a rhombus-shaped third end face; after the clamp is installed, processing a third end surface into a third flange surface, and processing two second threaded through holes on the third flange surface;
s4, adjusting a clamp, wherein the stepped hole and the pin hole are used as clamp positioning holes, the clamp is clamped and fixed from the first flange surface and the back surface of the first flange surface, and the clamp is also protruded from two sides of the third flange surface to clamp and fix the workpiece; after the clamp is adjusted, processing the second end surface to form a second flange surface, and processing two first threaded through holes on the second flange surface;
s5, carrying out laser marking on the machined part;
s6, cleaning the machined part,
s7, installing corresponding pin columns on the two pin holes of the first flange surface;
s8, performing a sealing test on the workpiece and marking the sealing test;
s9, appearance inspection;
and S10, packaging.
2. The process for machining an EGR flange according to claim 1, characterized in that: in the step S2/S3, the clamp takes the point A and the point B on the second end face as clamp pressing points, and the point a and the point B corresponding to the point A and the point B on the back face of the second end face as clamp rough positioning points; the clamp takes a point C on a bulge on one side close to the third end surface as a clamp pressing point, and a point C corresponding to the point C on a bulge on the other side close to the third end surface as a clamp rough positioning point; the anchor clamps compress tightly the point through 3 thick locating points of anchor clamps and 3 anchor clamps and fix the EGR flange blank.
3. The process for machining an EGR flange according to claim 2, characterized in that: the point a, the point B, and the point C are not on the same straight line.
4. The process for machining an EGR flange according to claim 1, characterized in that: in step S4, the jig uses three points on the first flange surface as support points, and the jig uses the end surface of the stepped hole as a pressing surface, and fixes the workpiece by using 3 support points and the pressing surface.
5. The process for machining the EGR flange according to claim 4, wherein: the 3 support points are not on the same line.
6. The process for machining the EGR flange according to claim 4, wherein: the clamp takes a point C on a bulge on one side close to the third flange surface as a secondary supporting point, and takes a point C corresponding to the point C on a bulge on the other side close to the third flange surface as a secondary pressing point.
7. The process for machining an EGR flange according to any one of claims 1-6, wherein: the clamp is a buckling type pneumatic clamp or a buckling type hydraulic clamp.
8. The process for machining an EGR flange according to any one of claims 1-6, wherein: in the step S2, the step S3, and the step S4, the tool for machining the first flange surface, the second flange surface, and the third flange surface is a PCD disc cutter.
9. The process for machining an EGR flange according to any one of claims 1-6, wherein: the processing equipment adopted in the step S2, the step S3 and the step S4 is a numerical control processing center.
CN202010612465.8A 2020-06-30 2020-06-30 Machining process of flange of exhaust gas recirculation system Active CN111660071B (en)

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CN111660071B CN111660071B (en) 2021-12-17

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113352058A (en) * 2021-06-23 2021-09-07 湛江德利车辆部件有限公司 High-precision part machining method

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002106420A (en) * 2000-09-29 2002-04-10 Mazda Motor Corp Structure of exhaust gas recirculation passage of engine
CN205117555U (en) * 2015-09-29 2016-03-30 湛江德利车辆部件有限公司 Improve flange assembly of structure
CN105499939A (en) * 2016-02-29 2016-04-20 无锡烨隆精密机械有限公司 Process for machining volute with round flange as air outlet
CN108772731A (en) * 2018-05-22 2018-11-09 泰州市金鹰精密铸造有限公司 The processing and positioning device of egr system inlet flange
CN109396762A (en) * 2018-11-09 2019-03-01 中船海洋动力部件有限公司 The assembly method of marine diesel exhaust gas recirculation device shell

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002106420A (en) * 2000-09-29 2002-04-10 Mazda Motor Corp Structure of exhaust gas recirculation passage of engine
CN205117555U (en) * 2015-09-29 2016-03-30 湛江德利车辆部件有限公司 Improve flange assembly of structure
CN105499939A (en) * 2016-02-29 2016-04-20 无锡烨隆精密机械有限公司 Process for machining volute with round flange as air outlet
CN108772731A (en) * 2018-05-22 2018-11-09 泰州市金鹰精密铸造有限公司 The processing and positioning device of egr system inlet flange
CN109396762A (en) * 2018-11-09 2019-03-01 中船海洋动力部件有限公司 The assembly method of marine diesel exhaust gas recirculation device shell

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113352058A (en) * 2021-06-23 2021-09-07 湛江德利车辆部件有限公司 High-precision part machining method
CN113352058B (en) * 2021-06-23 2023-05-02 湛江德利车辆部件有限公司 High-precision part machining method

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