CN113333829A - CNC machining method for automobile plastic part - Google Patents
CNC machining method for automobile plastic part Download PDFInfo
- Publication number
- CN113333829A CN113333829A CN202110601990.4A CN202110601990A CN113333829A CN 113333829 A CN113333829 A CN 113333829A CN 202110601990 A CN202110601990 A CN 202110601990A CN 113333829 A CN113333829 A CN 113333829A
- Authority
- CN
- China
- Prior art keywords
- parting surface
- processing
- plastic part
- plastic
- parting
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23C—MILLING
- B23C3/00—Milling particular work; Special milling operations; Machines therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23C—MILLING
- B23C9/00—Details or accessories so far as specially adapted to milling machines or cutter
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Milling Processes (AREA)
Abstract
The invention discloses a CNC (computer numerical control) machining method of automobile plastic parts, which comprises the following steps of: s1, importing a process model of the plastic part into processing software, creating a parting surface for connecting a process frame and the plastic part on a blank, dividing a front and back processing area S2 by taking the parting surface as a boundary, processing the front surface, taking the parting surface as a reference surface, and setting the processing allowance value of the parting surface as-R, wherein R is the radius value of a front processing cutter; s3, turning over to process the back surface, performing remote parting surface area processing on the back surface by taking the parting surface as a reference surface, setting the processing allowance value of the parting surface to be R + a, forming an unprocessed area which takes the parting surface as a base and has the thickness of a, taking the residual blank of the unprocessed area as a connecting part for connecting the process frame and the plastic piece, wherein a is 0.8-1.5 mm; and S4, processing the region close to the parting surface of the reverse surface, processing a cutter to penetrate through the connecting part, and separating the process frame and the plastic part to obtain a finished product. The plastic processing reliability can be guaranteed, and the forming precision is improved.
Description
Technical Field
The invention relates to the manufacture of automobile parts, in particular to a CNC (computer numerical control) machining method of automobile plastic parts.
Background
The automobile plastic part is mostly a thin-wall special-shaped part with a complex structure and poor rigidity, the wall thickness is 1-2.5 mm generally, and the core process problem in the forming process of machining the plastic part by adopting CNC is that: how to solve the problem of connection and separation of a plastic piece and a process frame in the installation and fixation of the plastic piece. Wherein, CNC is the abbreviation of Computer numerical Control, and CNC machining is numerical Control machining.
Currently, the commonly used connection and separation scheme of plastic parts and process frames is: referring to fig. 1, a plurality of process connecting sections 3 are designed between a plastic piece 1 and a process frame 2, the process connecting sections 3 are used as a part of the plastic piece 1 to connect the plastic piece 1 and the process frame 2 into a whole, the purpose of indirectly fixing the plastic piece 1 is achieved by fixing the process frame 2, and after the plastic piece 1 is completely processed and molded, the process connecting sections 3 are manually removed to obtain the complete plastic piece 1. The problems with this solution are: if the number of the process connecting sections 3 is designed to be large, the connection between the plastic part 1 and the process frame 2 is relatively reliable, the probability of deformation and damage of the plastic part 1 in the machining process is relatively reduced, but the workload of removing the process connecting sections manually in the follow-up process is increased, so that the precision and the surface quality of the plastic part 1 at the process connecting sections 3 are poor, and the process is particularly not suitable for machining simulation plastic parts and acrylic sample parts with high quality requirements. If the number of the process connecting sections 3 is designed to be small, although the workload of manually removing the process connecting sections 3 is reduced, the influence on the forming precision and the surface quality of the plastic part 1 is reduced, the connecting strength and the connecting reliability are reduced, and the unconnected area sample is easy to deform and damage due to the action of cutting force in the final forming stage. And these problems are more pronounced as the size of the plastic part 1 increases.
Disclosure of Invention
The invention aims to provide a CNC (computer numerical control) machining method for automobile plastic parts, which can ensure the reliability of plastic machining and improve the forming precision.
The invention relates to a CNC processing method of automobile plastic parts, which comprises the following steps:
s1, importing the process model of the plastic part into processing software, creating a parting surface on the blank for connecting the process frame and the plastic part, and dividing the front and back processing areas by using the parting surface as a boundary
S2, machining the front face, taking the parting face as a reference face, and setting the machining allowance value of the parting face as-R, wherein R is the radius value of the front face machining cutter;
s3, turning over to process the back surface, performing remote parting surface area processing on the back surface by taking the parting surface as a reference surface, setting the processing allowance value of the parting surface to be R + a, forming an unprocessed area which takes the parting surface as a base and has the thickness of a, taking the residual blank of the unprocessed area as a connecting part for connecting the process frame and the plastic piece, wherein a is 0.8-1.5 mm;
and S4, processing the region close to the parting surface of the reverse surface, processing a cutter to penetrate through the connecting part, and separating the process frame and the plastic part to obtain a finished product.
In S2, rough machining, semi-finishing, and finish machining are sequentially performed on the front surface of the plastic part using the parting surface as a reference surface, and a machining allowance value of the parting surface is set to-R at the time of finish machining.
In step S3, rough machining, semi-finishing, and local finishing in a far parting surface region are sequentially performed on the reverse surface of the plastic part using the parting surface as a reference surface, and a machining allowance value of the parting surface is set to be R + a when the local finishing in the far parting surface region is performed.
Further, in the step of processing the near parting surface region in S4, the plastic piece is milled in a clockwise or counterclockwise direction around the plastic piece, the plastic piece behind the tool advancing direction is cut and separated from the process frame, and the plastic piece ahead of the tool advancing direction is connected to the process frame through the connecting portion.
Compared with the prior art, the invention has the following beneficial effects.
1. The invention divides the front and back processing areas by taking the parting surface as a boundary, and sets processing allowance on the parting surface in the front and back processing processes respectively, thereby generating an unprocessed area which takes the parting surface as a base and takes the thickness as the total value of the processing allowance, and takes the residual blank of the unprocessed area as a connecting part for connecting the process frame and the plastic part, and the connecting part plays a role of fixed support in the cutting and forming process of the plastic part, thereby realizing the seamless connection between the plastic part and the process frame in the area to be processed, providing necessary fixed support for the cutting processing, and leaving no connecting part trace in the processed area.
2. The processing method improves the reliability of the connection of the process frame and the plastic part, and the residual blank as the connecting part is cut along with the forming of the plastic part and is removed from the edge of the plastic part, thereby not only ensuring the processing reliability of the plastic part, but also ensuring the integrity of the processing and forming of the plastic part, and improving the forming precision and the surface quality of the plastic part.
Drawings
FIG. 1 is a schematic view of a conventional connection structure of a process frame and a plastic part;
FIG. 2 is a schematic illustration of the mating of the parting surface of the present invention with a plastic part;
FIG. 3 is a schematic illustration of an exploded mating surface of the parting surface of the present invention with a plastic part;
fig. 4 is a schematic illustration of the removal of the connection plate according to the invention.
In the figure, 1 is a plastic part, 2 is a process frame, 3 is a process connecting section, 4 is a parting surface, 5 is a connecting part, and 6 is a cutter.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings.
A CNC machining method for automobile plastic parts comprises the following steps:
and S1, referring to the figures 2 and 3, importing the size data of the plastic part into processing software, wherein the processing software is CAD or CAM, creating a parting surface 4 for connecting the process frame 2 and the plastic part 1 on the blank, and dividing the front and back processing areas by taking the parting surface 4 as a boundary.
And S2, processing the front surface, wherein the plastic part 1 and the technical frame 2 are always kept in a fully connected favorable state through the blank at the position of the parting surface 4 in the processing process, and then the front surface is processed firstly to obtain the outer surface of the plastic part with high precision and high surface quality. And taking the parting surface 4 as a reference surface, and sequentially carrying out rough machining, semi-finishing machining and finish machining on the front surface of the plastic part, wherein the machining allowance value of the parting surface is set to be-R during finish machining. The machining allowance value of the parting surface 4 is set to be-R, and R is the radius value of the front machining cutter. The complete and thorough front processing is ensured, and the depth limit of the front processing is determined.
And S3, turning over the reverse surface, and sequentially carrying out rough machining, semi-finish machining and remote parting surface area local finish machining on the reverse surface of the plastic piece by taking the parting surface 4 as a reference surface, wherein the machining allowance value of the parting surface is set to be R + a when the remote parting surface area local finish machining is carried out. Forming a raw area with the thickness of a =1mm based on the parting surface 4, taking the residual blank of the raw area as a connecting part 5 for connecting the process frame and the plastic part, wherein the connecting part 5 ensures that the plastic part 1 and the process frame 2 are connected together uninterruptedly, and provides powerful support for the subsequent finish machining of the area close to the parting surface.
And S4, referring to fig. 4, performing finish machining on the back surface in a region close to the parting surface, removing the limit of the parting surface 4 on the machining depth, and enabling the cutter 6 to penetrate through the connecting part 5 in the machining process to realize effective separation of the process frame 2 and the plastic part 1 until the machining is finished, and finally forming the plastic part 1 and completely separating the plastic part 1 from the process frame 2. And milling the plastic part in a clockwise or anticlockwise direction, cutting and separating the plastic part behind the cutter advancing direction from the process frame, and keeping the plastic part in front of the cutter advancing direction and the process frame in a connected state through a connecting part.
The processing method improves the reliability of the connection of the process frame and the plastic part, and the residual blank as the connecting part is cut along with the forming of the plastic part and is removed from the edge of the plastic part, thereby not only ensuring the processing reliability of the plastic part, but also ensuring the integrity of the processing and forming of the plastic part, and improving the forming precision and the surface quality of the plastic part.
The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (4)
1. A CNC machining method for automobile plastic parts is characterized by comprising the following steps:
s1, importing the process model of the plastic part into processing software, creating a parting surface on the blank for connecting the process frame and the plastic part, and dividing the front and back processing areas by using the parting surface as a boundary
S2, machining the front face, taking the parting face as a reference face, and setting the machining allowance value of the parting face as-R, wherein R is the radius value of the front face machining cutter;
s3, turning over to process the back surface, performing remote parting surface area processing on the back surface by taking the parting surface as a reference surface, setting the processing allowance value of the parting surface to be R + a, forming an unprocessed area which takes the parting surface as a base and has the thickness of a, taking the residual blank of the unprocessed area as a connecting part for connecting the process frame and the plastic piece, wherein a is 0.8-1.5 mm;
and S4, processing the region close to the parting surface of the reverse surface, processing a cutter to penetrate through the connecting part, and separating the process frame and the plastic part to obtain a finished product.
2. The CNC machining method for plastic parts of automobiles according to claim 1, wherein: and in the step S2, the front surface of the plastic part is subjected to rough machining, semi-finishing and finish machining in sequence by taking the parting surface as a datum plane, and the machining allowance value of the parting surface is set to be-R during finish machining.
3. A CNC machining method for automotive plastic parts according to claim 1 or 2, characterized in that: and in the step S3, the reverse surface of the plastic part is subjected to rough machining, semi-finishing and remote parting surface area local finishing in sequence by taking the parting surface as a reference surface, and the machining allowance value of the parting surface is set to be R + a when the remote parting surface area local finishing is carried out.
4. A CNC machining method for automotive plastic parts according to claim 1 or 2, characterized in that: in the step S4, in the step of processing the near parting surface region, the plastic part is milled in a clockwise or counterclockwise direction around the plastic part, the plastic part is cut and separated from the process frame at the rear side in the tool advancing direction, and the plastic part at the front side in the tool advancing direction is kept connected to the process frame by the connecting portion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110601990.4A CN113333829B (en) | 2021-05-31 | 2021-05-31 | CNC machining method for automobile plastic part |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110601990.4A CN113333829B (en) | 2021-05-31 | 2021-05-31 | CNC machining method for automobile plastic part |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113333829A true CN113333829A (en) | 2021-09-03 |
| CN113333829B CN113333829B (en) | 2023-03-14 |
Family
ID=77472944
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110601990.4A Active CN113333829B (en) | 2021-05-31 | 2021-05-31 | CNC machining method for automobile plastic part |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113333829B (en) |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2929154A1 (en) * | 2008-03-31 | 2009-10-02 | Snecma Sa | IMPROVED METHOD FOR MANUFACTURING A MONOBLOC AUBING DISK, WITH PROVISIONAL RETAINING RING FOR REMOVED BLADES BEFORE A MILLING FINISHING STEP |
| CN101670462A (en) * | 2009-09-29 | 2010-03-17 | 江西洪都航空工业集团有限责任公司 | Wall plate processing technology for hyperboloid thin wall |
| CN101733453A (en) * | 2008-11-21 | 2010-06-16 | 成都飞机工业（集团）有限责任公司 | Numerical control part milling processing clamping method |
| CN102728878A (en) * | 2012-06-06 | 2012-10-17 | 沈阳飞机工业（集团）有限公司 | Numerical control curved surface profile processing Z-shaped process connection method |
| CN103009129A (en) * | 2012-12-10 | 2013-04-03 | 成都飞机工业（集团）有限责任公司 | Milling processing clamping method of numerical control parts |
| CN103537741A (en) * | 2012-07-13 | 2014-01-29 | 北汽福田汽车股份有限公司 | Evanescent mode processing method for casting automobile stamping die |
| CN108515218A (en) * | 2018-04-10 | 2018-09-11 | 沈阳百祥机械加工有限公司 | A kind of processing method preventing the processing trembling of light sheet part |
| CN108526559A (en) * | 2018-04-16 | 2018-09-14 | 上海小糸车灯有限公司 | Car light imitates the processing method of part |
| CN110587237A (en) * | 2019-09-20 | 2019-12-20 | 西安飞机工业（集团）有限责任公司 | Numerical control machining method for thin-wall curved surface edge strip structural part of airplane |
-
2021
- 2021-05-31 CN CN202110601990.4A patent/CN113333829B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2929154A1 (en) * | 2008-03-31 | 2009-10-02 | Snecma Sa | IMPROVED METHOD FOR MANUFACTURING A MONOBLOC AUBING DISK, WITH PROVISIONAL RETAINING RING FOR REMOVED BLADES BEFORE A MILLING FINISHING STEP |
| CN101733453A (en) * | 2008-11-21 | 2010-06-16 | 成都飞机工业（集团）有限责任公司 | Numerical control part milling processing clamping method |
| CN101670462A (en) * | 2009-09-29 | 2010-03-17 | 江西洪都航空工业集团有限责任公司 | Wall plate processing technology for hyperboloid thin wall |
| CN102728878A (en) * | 2012-06-06 | 2012-10-17 | 沈阳飞机工业（集团）有限公司 | Numerical control curved surface profile processing Z-shaped process connection method |
| CN103537741A (en) * | 2012-07-13 | 2014-01-29 | 北汽福田汽车股份有限公司 | Evanescent mode processing method for casting automobile stamping die |
| CN103009129A (en) * | 2012-12-10 | 2013-04-03 | 成都飞机工业（集团）有限责任公司 | Milling processing clamping method of numerical control parts |
| CN108515218A (en) * | 2018-04-10 | 2018-09-11 | 沈阳百祥机械加工有限公司 | A kind of processing method preventing the processing trembling of light sheet part |
| CN108526559A (en) * | 2018-04-16 | 2018-09-14 | 上海小糸车灯有限公司 | Car light imitates the processing method of part |
| CN110587237A (en) * | 2019-09-20 | 2019-12-20 | 西安飞机工业（集团）有限责任公司 | Numerical control machining method for thin-wall curved surface edge strip structural part of airplane |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113333829B (en) | 2023-03-14 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105290712A (en) | Machining method of curved surface part | |
| CN105478603B (en) | A kind of fractionation processing technology of automobile die | |
| CN105537657A (en) | Method for machining lug-type notch in numerical control mode | |
| CN113333829B (en) | CNC machining method for automobile plastic part | |
| CN114722538A (en) | Solid modeling method, recording medium and system for waste cutter | |
| US6850814B2 (en) | Machining program preparation apparatus | |
| US7464011B2 (en) | Method for determining addendum and binder surfaces of springback compensated stamping dies | |
| CN103978105A (en) | Coverage piece female mold and machining and assembling method thereof | |
| CN102513795B (en) | Arc opening part machining process | |
| CN112338454B (en) | Three-dimensional simulation machining tool and method for special-shaped stainless steel thin-wall part | |
| CN112122887B (en) | Method for processing airplane plate rib structural member | |
| CN106944793A (en) | A kind of processing method of elongated plate part | |
| CN103358090A (en) | Processing technic of bar-shaped thin-wall part | |
| KR101618733B1 (en) | Machining method for bevel gear die | |
| CN114918627B (en) | Metal box body machining method based on turning and milling | |
| CN114415591B (en) | Tool path optimization method and system for multi-curvature skin surface machining | |
| CN106425293B (en) | A kind of moulding process of the bright panel of triangle | |
| US7721585B2 (en) | Integrated sheet metal forming, assembly and inspection system | |
| CN213561183U (en) | Three-dimensional simulation machining tool for special-shaped stainless steel thin-wall part | |
| CN114798911A (en) | Low-cost and high-precision trial production method for body-in-white | |
| CN115870780A (en) | Machining method of arc-shaped thin-wall workpiece | |
| CN103567306A (en) | Fabricating method of metal progressive die | |
| CN107498753A (en) | Mold insert made from tubulose light guide injection mold mold insert processing method and use this method | |
| CN114919320B (en) | Processing technology of thin-wall part of three-dimensional stone carving | |
| CN207172523U (en) | Tubulose light guide injection mold mold insert |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |