CN107443632B - Injection mold insert machining method, insert and clamp for machining insert - Google Patents
Injection mold insert machining method, insert and clamp for machining insert Download PDFInfo
- Publication number
- CN107443632B CN107443632B CN201710822962.9A CN201710822962A CN107443632B CN 107443632 B CN107443632 B CN 107443632B CN 201710822962 A CN201710822962 A CN 201710822962A CN 107443632 B CN107443632 B CN 107443632B
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- injection mold
- insert
- mold insert
- core
- top surface
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- 238000002347 injection Methods 0.000 title claims abstract description 72
- 239000007924 injection Substances 0.000 title claims abstract description 72
- 238000003754 machining Methods 0.000 title claims abstract description 28
- 238000000034 method Methods 0.000 title claims abstract description 13
- 230000003287 optical effect Effects 0.000 claims abstract description 27
- 238000005520 cutting process Methods 0.000 claims abstract description 22
- 238000005498 polishing Methods 0.000 claims abstract description 22
- 239000002994 raw material Substances 0.000 claims abstract description 15
- 238000003672 processing method Methods 0.000 claims abstract description 13
- 230000002093 peripheral effect Effects 0.000 claims abstract description 4
- 238000000465 moulding Methods 0.000 claims description 4
- 238000010791 quenching Methods 0.000 claims description 4
- 230000000171 quenching effect Effects 0.000 claims description 4
- 238000000926 separation method Methods 0.000 claims description 3
- 239000002699 waste material Substances 0.000 description 6
- 238000010438 heat treatment Methods 0.000 description 5
- 238000001746 injection moulding Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000007306 turnover Effects 0.000 description 3
- 238000009434 installation Methods 0.000 description 2
- 238000012797 qualification Methods 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000012938 design process Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/38—Moulds or cores; Details thereof or accessories therefor characterised by the material or the manufacturing process
- B29C33/3842—Manufacturing moulds, e.g. shaping the mould surface by machining
-
- 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
- B23Q3/02—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine for mounting on a work-table, tool-slide, or analogous part
- B23Q3/06—Work-clamping means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/26—Moulds
- B29C45/2602—Mould construction elements
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2011/00—Optical elements, e.g. lenses, prisms
- B29L2011/0016—Lenses
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
The invention relates to a processing method of an insert of an injection mold, an insert and a processing clamp thereof, wherein the method is to perform rough processing of smooth continuous curved surfaces on the top surface of a raw material block so as to completely cover an optical surface on an injection part to be molded and have a surplus whole peripheral edge area, and the surface shape of the curved surfaces is a surface shape which can be matched and attached with the optical surface; dividing the raw material block into a columnar core part and a sleeve part by linear cutting, embedding the core part into a die for finish machining, and embedding the core part into the sleeve part for polishing the top surface of the core part; the clamp comprises a clamp main body, wherein the clamp main body is provided with a mounting hole for embedding an injection mold insert, the top surface of the clamp main body just surrounds the periphery of the top surface of the injection mold insert along with the shape in a state of embedding the injection mold insert, and the top surface of the clamp main body is smoothly spliced with and tangent to the top surface of the injection mold insert. The invention can prevent the phenomenon of flanging in the polishing of the insert and improve the appearance quality of injection products.
Description
Technical Field
The invention relates to a processing method of an injection mold insert, an insert and a clamp used for processing the insert, in particular to a processing method of an injection mold insert used for forming an optical surface of a thick-wall lens and a clamp used by the same, belonging to the technical field of processing of automobile lamp injection mold inserts.
Background
In the design process of the injection mold, considering the requirements of convenience in processing and cost saving, the injection molding of some special structures such as the optical surface is usually completed by virtue of an insert structure, so that the design change of the subsequent optical surface can be facilitated, the replacement of different optical pattern structures can be realized with the lowest cost, and the processing speed and quality of the mold can be improved. Accordingly, the machining precision of the surface of the insert corresponding to the optical surface is required to be high, and due to the limitation of the machining precision and the rotation speed of the machine tool, it is difficult to achieve machining of a part of the corresponding surface of the insert in place, and polishing is required in many cases, and the contour of the corresponding surface of the insert is affected by mechanical polishing or manual polishing, for example, the boundary edges are worn (this phenomenon is called "turn-over"). The insert with worn boundary edges and corners is adopted, so that the phenomenon that plastic overflows along a die gap easily occurs in the subsequent injection molding process, and the appearance quality of an injection molding product is reduced to a certain extent.
Disclosure of Invention
In order to overcome the defects, the invention provides an injection mold insert processing method, an insert and a processing clamp thereof, which can prevent the phenomenon of turning over and improve the appearance quality of injection products.
The main technical scheme of the invention is as follows:
an injection mold insert processing method comprising:
step (1): rough machining of smooth continuous curved surfaces is carried out on the top surfaces of the raw material blocks, the surface shape of the curved surfaces is a surface shape which can be matched and attached with an optical surface on an injection part to be molded of the injection mold insert, and the area of the curved surfaces is larger than that of the optical surface, so that the optical surface can be completely covered and a surplus whole peripheral edge area exists;
step (2): separating a columnar core from the raw material block by wire cutting, serving as the injection mold insert, the remaining part being called a sleeve part, serving as a clamp body for insert processing, the combination of the core and the top surface of the sleeve part corresponding to the curved surface, wherein the top surface of the core corresponds to the optical surface;
step (3): embedding the core into a die according to a design azimuth, and finishing the combination of the core and the die, wherein the finishing comprises finishing the curved surface of the top surface of the core;
step (4): and embedding the core part into the sleeve part according to the direction before separation, and relatively and fixedly connecting the core part and the sleeve part at the lower part to obtain an assembly body, and polishing the top surface of the core part on the assembly body to form the curved surface.
And (3) carrying out vacuum quenching on the part obtained in the step (1) between the step (1) and the step (2) to ensure that the surface hardness of the part reaches HRC 46-48.
The polishing in step (4) may be mechanical polishing or manual polishing.
Before the rough machining of the curved surface in the step (1), machining a vertical through hole in the raw material block, wherein the horizontal position of the vertical through hole is close to the designed path of the linear cutting in the step (2).
The design path of the wire cutting in the step (2) may be a unidirectional closed loop path.
In the step (2), the vertical through hole is used as a starting point of linear cutting, then the vertical through hole moves along a horizontal plane to the design path along a path shortest away from the design path, and then the vertical through hole is cut along the design path.
The injection mold insert may be an insert for molding an optical surface of a thick-walled lens.
An injection mold insert is the core manufactured by the injection mold insert processing method.
The clamp for processing the injection mold insert comprises a clamp main body, wherein the clamp main body is the sleeve part processed by the injection mold insert processing method.
The fixture for processing the injection mold inserts can further comprise a base, the fixture main body is installed on the base, the fixture main body and the base are positioned through pins and fixed through screws, blind holes are formed in the fixture main body, the blind holes are preferably stepped holes with large outer diameters and small inner diameters, the outer section holes are pin holes, the inner section holes are waste discharge holes, and through pin holes and counter bores for installing screws are formed in the base in areas corresponding to the installation holes.
The beneficial effects of the invention are as follows:
the method for processing the insert of the injection mold is also a processing method of a clamp for processing the insert, and by the method, a set of processing flow can simultaneously process the injection mold insert with a mutual matching relationship and a clamp main body of the clamp for polishing the insert. Therefore, when the working surface (namely the surface for forming the optical surface on the injection part) of the insert is polished, the insert can be inlaid into the clamp main body, and due to the matching relationship of the insert and the clamp main body, the boundary edge angle of the working surface of the insert can be well protected when the insert of the injection mold is processed, flash is not caused any more, the problem of the turn-over of the insert of the traditional injection mold is well solved, the appearance quality of an injection product is further improved, and the qualification rate of the car lamp is correspondingly improved. In particular, in the case of molding the optical surface of the thick-walled lens, the effect of protecting the optical boundary of the lens is achieved, and the jig main body can be repeatedly used in the subsequent design change, so that the manufacturing cost is greatly saved, and the advantages of the insert are fully utilized.
With the clamp, the profile of the injection mold insert can be richer and more diversified, and the problem of mold processing and polishing precision is not required to be worried as long as the protection structure is added.
The injection mold insert and the clamp for processing the same are simple in structure, easy to implement and popularize and wide in applicability.
Drawings
FIG. 1 is a schematic view of the corresponding structure prior to roughing the working surface of the injection mold insert;
FIG. 2 is a schematic view of a wire cut trace;
FIG. 3 is a schematic perspective view of an embodiment of the clamp body;
FIG. 4 is a schematic perspective view of an embodiment of the injection mold insert;
FIG. 5 is a cross-sectional view of one embodiment of the injection mold insert machining fixture;
FIG. 6 is an enlarged view of part of I of FIG. 5;
FIG. 7 is a schematic perspective view of a thick-walled lens;
fig. 8 is a schematic diagram showing the relative positional relationship between the injection mold insert and the thick-wall lens molded by the corresponding mold.
Detailed Description
As shown in fig. 1-4, 7 and 8, the invention discloses a processing method of an injection mold insert, which comprises the following steps:
step (1): rough machining of a smooth continuous curved surface is performed on the top surface of the raw material block 3, wherein the curved surface has a surface shape which can be matched and attached with an optical surface A on an injection part (such as a thick-wall lens 6 in fig. 7 and 8) to be molded by the injection mold insert, and the curved surface area is larger than the area of the optical surface, so that the curved surface can completely cover the optical surface and has a surplus whole peripheral edge area;
step (2): separating a columnar core part 1 from the raw material block by linear cutting disposable unidirectional wire, wherein the columnar core part is used as the injection mold insert, the rest part is called a sleeve part 2 and is used as a clamp main body for insert machining, the combination of the top surface a of the core part and the top surface b of the sleeve part corresponds to the curved surface, and the top surface of the core part just corresponds to the optical surface;
step (3): embedding the core into a die according to a design azimuth, and finishing the combination of the core and the die, wherein the finishing comprises finishing the curved surface of the top surface a of the core;
step (4): and embedding the core part into the sleeve part according to the direction before separation, and relatively and fixedly connecting the core part and the sleeve part at the lower part to obtain an assembly body, and polishing the top surface of the core part on the assembly body to form the curved surface.
The sleeve part not only can play a role in protecting an optical boundary during processing of a new mold insert, avoids the problem that the traditional insert is easy to flash, improves the appearance quality of an optical surface of an injection molded product, improves the qualification rate of a car lamp, but also can be repeatedly used during subsequent design change, and greatly saves the manufacturing cost.
And (3) heat treatment is usually carried out between the step (1) and the step (2), and the specific process is vacuum quenching and ensures that the surface hardness of the part reaches HRC 46-48 so as to prolong the service life of the insert. Before heat treatment, screw holes for subsequent fixed installation and pin holes for pre-machining and positioning are machined on the raw material block, after heat treatment, the part is heated and deformed, and at the moment, secondary finish machining is performed on the pin holes so as to improve the precision of the pin holes. The processing of the pin holes and screw holes is usually completed before wire cutting.
The polishing in step (4) may be mechanical polishing or manual polishing.
In order to facilitate the wire-electrode cutting process, a vertical through hole C is usually machined in the raw material block before the rough machining of the curved surface in the step (1), and the horizontal position of the vertical through hole is close to the designed path of the wire-electrode cutting in the step (2).
The design path of the wire-cut in the step (2) may be a unidirectional closed loop path, such as a counterclockwise unidirectional closed loop path 4 in a top view as shown in fig. 2. The design path is consistent with a cross-sectional design profile of the injection mold insert.
In the step (2), the vertical through hole is used as a starting point of linear cutting, then the vertical through hole moves along a horizontal plane to the design path along a path shortest away from the design path, and then cutting is carried out along the design path.
The injection mold insert is preferably an insert for molding an optical surface of a thick-walled lens.
The invention also provides an injection mold insert which is the core 1 manufactured by the injection mold insert processing method. The injection mold insert is of a columnar structure, and the top surface of the injection mold insert is a working surface.
The invention also provides a clamp for processing the insert of the injection mold, which comprises a clamp main body, wherein the clamp main body is the sleeve part 2 processed by the processing method of the insert of the injection mold.
The clamp for processing the insert of the injection mold can further comprise a base 5, as shown in fig. 5 and 6, the clamp body is arranged on the base, the clamp body and the base are positioned through a pin 8, and the clamp body and the base are fixed through a screw 7. When the insert is mounted on the fixture, the insert is positioned by a pin 9 and fixedly connected with the base through a screw 10 in addition to the positioning of the fixture body and the base. Correspondingly, the fixture main body and the insert are provided with blind holes and screw holes, the blind holes are stepped holes with large outer diameter and small inner diameter, the outer section holes are pin holes and are in interference fit with pins 8 and 9 respectively, the inner section holes 12 are waste discharge holes, the waste discharge holes are machined when the pin holes are machined in advance, when the pin holes are machined secondarily after heat treatment, the cutting amount of the pin holes for secondary machining is reduced due to the waste discharge holes, excessive abrasion or fracture of a tool of a machine tool is avoided, and in addition, chips can be stored in a top space due to the fact that the depth of the waste discharge holes is larger than that of the actually machined pin holes, so that smooth machining is guaranteed.
The base is provided with a through pin hole corresponding to the pin 9 and a counter bore for installing the screw 10 in a region corresponding to the mounting hole, and other regions are provided with a through pin hole corresponding to the pin 8 and a counter bore for installing the screw 7.
During polishing, after the relevant parts are fixedly connected according to fig. 5, the clamp can be fixed on a machine tool or a workbench through a machine tool pressing plate 11.
The following takes fig. 1-4 as an example to fully describe the processing procedure of the injection mold insert and the clamp thereof:
and selecting a bar stock as a blank of the insert and the clamp, and processing a hole C on the top surface of the bar stock in advance before cutting so as to enable a wire to pass through during subsequent wire cutting. At this time, the insert 1 and the clamp body 2 still belong to one integral raw material block 3, and then all structures (including the top surface and the screw holes) of the raw material block 3 are rough machined, wherein the top surface comprises the top surface (i.e. the working surface a) of the insert and the top surface (i.e. the protection surface b) of the clamp in the future, so that the rough machining is equivalent to the simultaneous rough machining of the working surface and the protection surface, the raw material block 3 is fixedly connected with the base 5 during the rough machining, and the base 5 is fixed on a machine tool for cutting. And finishing the pin holes (containing the waste discharge holes). Then, the rough machined part is subjected to vacuum quenching heat treatment, and after the completion, the rough machined part is divided into the injection mold insert 1 and the included angle main body 2 of the clamp for processing the injection mold insert by wire cutting. The wire cutting direction may be moved counterclockwise with the point C as a starting point in the arrow direction shown in fig. 2. After cutting, insert 1 is inserted into a mold for merging finishing. The surface quality of the top surface of the insert is required to be high, and polishing treatment is required. At this time, the insert is taken out from the mold, and is inserted into the mounting hole 2-1 of the jig main body, and the curved surface b is tangent to the curved surface a, so that the edge corner of the curved surface a is not worn during polishing, and the surface quality of the injection molded product can be improved to some extent.
By adopting the injection mold insert and the clamp for processing the injection mold insert, the boundary edges and corners of the working surface of the injection mold insert can be well protected when the injection mold insert is processed, so that the problem of turn-over of the traditional injection mold insert is solved, and the appearance quality of injection products is improved. And the clamp can be repeatedly used in the subsequent design change, so that the manufacturing cost is greatly saved.
Claims (7)
1. The processing method of the injection mold insert is characterized by comprising the following steps of:
comprising the following steps:
step (1): rough machining of smooth continuous curved surfaces is carried out on the top surfaces of the raw material blocks, the surface shape of the curved surfaces is a surface shape which can be matched and attached with an optical surface on an injection part to be molded of the injection mold insert, and the area of the curved surfaces is larger than that of the optical surface, so that the optical surface can be completely covered and a surplus whole peripheral edge area exists;
step (2): separating a columnar core from the raw material block by wire cutting, serving as the injection mold insert, the remaining part being called a sleeve part, serving as a clamp body for insert processing, the combination of the core and the top surface of the sleeve part corresponding to the curved surface, wherein the top surface of the core corresponds to the optical surface;
step (3): embedding the core into a die according to a design azimuth, and finishing the combination of the core and the die, wherein the finishing comprises finishing the curved surface of the top surface of the core;
step (4): and embedding the core part into the sleeve part according to the direction before separation, and relatively and fixedly connecting the core part and the sleeve part at the lower part to obtain an assembly body, and polishing the top surface of the core part on the assembly body to form the curved surface.
2. The method of processing an injection mold insert according to claim 1, wherein:
and (3) carrying out vacuum quenching on the part obtained in the step (1) between the step (1) and the step (2) to ensure that the surface hardness of the part reaches HRC 46-48.
3. The method of processing an injection mold insert according to claim 2, wherein:
the polishing in the step (4) is mechanical polishing or manual polishing.
4. The injection mold insert machining method according to claim 3, wherein:
before the rough machining of the curved surface in the step (1), machining a vertical through hole in the raw material block, wherein the horizontal position of the vertical through hole is close to the designed path of the linear cutting in the step (2).
5. The injection mold insert machining method according to claim 4, wherein:
the design path of the wire cutting in the step (2) is a unidirectional closed annular path.
6. The injection mold insert machining method according to claim 5, wherein:
in the step (2), the vertical through hole is used as a starting point of linear cutting, then the vertical through hole moves along a horizontal plane to the design path along a path shortest away from the design path, and then the vertical through hole is cut along the design path.
7. The injection mold insert processing method according to claim 1, 2, 3, 4, 5 or 6, characterized in that:
the injection mold insert is an insert for molding an optical surface of a thick-walled lens.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710822962.9A CN107443632B (en) | 2017-09-13 | 2017-09-13 | Injection mold insert machining method, insert and clamp for machining insert |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710822962.9A CN107443632B (en) | 2017-09-13 | 2017-09-13 | Injection mold insert machining method, insert and clamp for machining insert |
Publications (2)
| Publication Number | Publication Date |
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| CN107443632A CN107443632A (en) | 2017-12-08 |
| CN107443632B true CN107443632B (en) | 2024-01-26 |
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| CN201710822962.9A Active CN107443632B (en) | 2017-09-13 | 2017-09-13 | Injection mold insert machining method, insert and clamp for machining insert |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108312423B (en) * | 2018-05-11 | 2023-12-15 | 珠海格力精密模具有限公司 | A mould and injection molding machine for filter screen production |
| CN110406036A (en) * | 2019-08-29 | 2019-11-05 | 东莞晶彩光学有限公司 | A kind of optics mode of polygon mirror |
| CN110900134A (en) * | 2019-12-19 | 2020-03-24 | 佛山市成阳正大模具五金塑料有限公司 | Method for processing hardened cold stamping die steel of automobile |
| CN111531779A (en) * | 2020-05-17 | 2020-08-14 | 惠州市恺琞实业有限公司 | Injection molding method for scooter plate body and scooter |
| CN114193102A (en) * | 2021-12-20 | 2022-03-18 | 芜湖兆合汽车零部件科技有限公司 | Production process of high-strength expansion fastener |
| CN115041933B (en) * | 2022-05-13 | 2023-09-26 | 中国第一汽车股份有限公司 | Combined machining method for step insert |
| CN114918615A (en) * | 2022-05-13 | 2022-08-19 | 浙江百康光学股份有限公司 | Preparation method of optical insert |
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| CN106239835A (en) * | 2016-08-12 | 2016-12-21 | 东江模具（深圳）有限公司 | The bright finish mold insert of a kind of injection mold and manufacture method thereof |
| CN106696173A (en) * | 2017-01-11 | 2017-05-24 | 东莞市津舜康五金制品有限公司 | Injection mold male mold core and production method of injection mold male mold core |
| CN207594213U (en) * | 2017-09-13 | 2018-07-10 | 华域视觉科技(上海)有限公司 | Injection mold mold insert fixture for processing |
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| CN106239835A (en) * | 2016-08-12 | 2016-12-21 | 东江模具（深圳）有限公司 | The bright finish mold insert of a kind of injection mold and manufacture method thereof |
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| CN107443632A (en) | 2017-12-08 |
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