CN114074401B - Method for preventing flash of secondary injection molding through tapered groove structure - Google Patents
Method for preventing flash of secondary injection molding through tapered groove structure Download PDFInfo
- Publication number
- CN114074401B CN114074401B CN202111097399.6A CN202111097399A CN114074401B CN 114074401 B CN114074401 B CN 114074401B CN 202111097399 A CN202111097399 A CN 202111097399A CN 114074401 B CN114074401 B CN 114074401B
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- China
- Prior art keywords
- side wall
- sliding seat
- groove
- wall
- wall surface
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- 238000001746 injection moulding Methods 0.000 title claims abstract description 34
- 238000000034 method Methods 0.000 title claims abstract description 21
- 239000011324 bead Substances 0.000 claims abstract description 27
- 239000012778 molding material Substances 0.000 description 12
- 238000000465 moulding Methods 0.000 description 6
- 239000004033 plastic Substances 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 235000013405 beer Nutrition 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010073 coating (rubber) Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000010137 moulding (plastic) Methods 0.000 description 1
- 239000002994 raw material Substances 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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
The invention discloses a method for preventing flash by tapering a groove structure, which is to prepare a sliding seat and a mould matched with the sliding seat, wherein a core sunk into the sliding seat is arranged in the mould, the sliding seat is provided with a first inner side wall which is used for forming part of the inner side wall of a bead groove, the core is provided with a convex part which is used for forming the bead groove, the convex part is provided with a first wall surface and a second wall surface, the upper side wall of the first inner side wall of the sliding seat is matched with the first wall surface to form the second inner side wall of the bead groove, the lower side wall of the first inner side wall of the sliding seat is matched with the second wall surface to form the third inner side wall of the bead groove, and the lower side wall of the first inner side wall of the sliding seat is provided with a groove along the axial direction; according to the method, the groove is matched with the second wall surface to form a tapered groove structure, so that the flash phenomenon cannot occur in the area at the position during secondary injection molding.
Description
Technical Field
The invention relates to the field of secondary injection molding, in particular to a method for preventing secondary injection molding flash through a tapered groove structure.
Background
And (3) secondary injection molding: is a special plastic molding process, also called beer set or rubber coating. It is similar to the two-color molding process, but differs considerably from the two-color molding process. The method is a process for molding a certain plastic raw material in a primary plastic mold, taking out the molded part, putting the molded part into a secondary molding mold, and injecting the same kind of plastic material or another plastic material again. More complex is multiple molding, which allows the shape and process of the plastic product to meet the desired requirements, known as two shot molding. Of course, the metal workpiece is coated with the corresponding injection molded part, also referred to as overmolding.
In the field of guide devices, in particular linear motion guides, which comprise a linear rail and a carriage that moves on the rail; in order to ensure the smoothness of the sliding seat moving on the sliding rail, the sliding seat needs to be internally provided with balls, so that the sliding seat is subjected to secondary injection molding to form an injection molding piece, and the injection molding piece is provided with a ball circulation passage (ball groove) for enabling the balls to move, and an upper retainer, a middle retainer and a lower retainer which seal and prevent dust from the ball circulation passage and keep contact with the sliding rail.
When the sliding seat is subjected to secondary injection molding to form injection molding pieces with corresponding shapes on the sliding seat, especially when the structure of the bead groove is formed, the bead groove is formed by an inner side wall (defined as a first inner side wall) of the sliding seat and injection molding materials attached to two sides of the inner side wall of the sliding seat, so that the radial section of the bead groove is approximately C-shaped, the injection molding materials on two sides respectively form a second inner side wall and a third inner side wall of the bead groove, and in order to ensure that the attached injection molding materials have enough adhesive force and certain strength, the inner side wall, which is contacted with the injection molding materials, of the sliding seat is concave, so that the contact area of the injection molding materials at the position and the use amount of the injection molding materials are increased. As shown in fig. 1, a part of the outer side wall of the mold core 2 forming the third inner side wall is in the shape of a straight surface 21 (the straight surface is made for simple processing and reduced production cost), the existence of the straight surface 21 enables the third inner side wall of the bead groove formed by the mold core to have a straight surface along the axial direction, and the existence of the straight surface enables the gap between the third inner side wall and the edge of the concave in the sliding seat to be overlarge, so that when the secondary injection molding is performed, the injection molding material has a risk of certain escaping into the bead groove, and a certain protrusion exists on the inner side wall of the bead groove, which is not a smooth inner side wall meeting the design requirement. Therefore, improvements in the method of overmolding the bead groove are needed to ensure that flash does not occur during overmolding.
Disclosure of Invention
In view of the foregoing, it is necessary to provide a method for preventing flash during secondary injection molding by a tapered groove structure, which has a simple structure and effectively improves the yield of products.
In order to solve the technical problems, the technical scheme of the invention is as follows: a method for preventing flash over injection molding by tapered trench structure, comprising the steps of:
S1, preparing a sliding seat and a mold matched with the sliding seat, wherein a core sunk into the sliding seat is arranged in the mold, the sliding seat is provided with a first inner side wall which is used for forming part of the inner side wall of the bead groove, the core is provided with a convex part which is used for forming the bead groove, the convex part is provided with a first wall surface and a second wall surface, the upper side wall of the first inner side wall of the sliding seat is matched with the first wall surface to form a second inner side wall of the bead groove, the lower side wall of the first inner side wall of the sliding seat is matched with the second wall surface to form a third inner side wall of the bead groove, and the lower side wall of the first inner side wall of the sliding seat is provided with a groove along the axial direction of the groove;
s2, processing a part of the side wall, adjacent to the first inner side wall, of the lower side wall of the first inner side wall of the sliding seat into an arc-shaped convex curved surface, processing a part of the wall surface, matched with the convex curved surface, of the second wall surface of the mold core into a concave curved surface, so that a gap between the convex curved surface and the concave curved surface is gradually reduced along the direction close to the first inner side wall, and a tapered groove structure is formed at the gap;
s2, sleeving the sliding seat into the mold core in a sliding manner, closing the mold, and performing secondary injection molding.
Further, a minimum gap between the lower side wall of the first inner side wall of the sliding seat and the second wall surface is smaller than 0.05mm.
Further, after the die is clamped, the minimum gap between the lower side wall of the first inner side wall of the sliding seat and the second wall surface is 0.015-0.04 mm.
Further, the second wall surface is embedded into the groove.
Furthermore, the area where the tapered groove structure is located forms a difficult-to-feed area, and other areas are easy-to-feed areas.
Compared with the prior art, the invention has the following beneficial effects: according to the method, the tapered groove structure is formed between the sliding seat and the mold core, and through the tapered groove structure, when the sliding seat is subjected to secondary injection molding to form the bead groove structure, injection molding materials do not protrude into the inner side wall of the bead groove, namely, no flash phenomenon occurs, and the tapered groove structure is simple in structure and effectively improves the yield of products.
The foregoing and other objects, features and advantages of the invention will be apparent from the following more particular description of preferred embodiments, as illustrated in the accompanying drawings.
Drawings
Fig. 1 is a schematic structural view of a conventional injection molding structure.
Fig. 2 is a schematic structural diagram of an embodiment of the present invention.
Fig. 3 is a schematic view of a partial enlarged structure according to an embodiment of the present invention.
In the figure: 1-sliding seat, 11-groove, 12-convex curved surface, 13-first inner side wall, 2-original core, 21-straight surface, 3-core of the application, 31-concave curved surface, 32-second wall surface, 33-first wall surface, 34-convex part, 4-tapered groove structure and 5-easy feeding area.
Detailed Description
In order to further describe the technical means and effects adopted by the invention for achieving the preset aim, the following detailed description of the specific implementation, structure, characteristics and effects according to the invention is given with reference to the accompanying drawings and the preferred embodiment.
As shown in fig. 2-3, a method for preventing flash over injection molding by tapered trench structure is performed as follows:
S1, preparing a sliding seat 1 and a mold matched with the sliding seat, wherein the mold is internally provided with a core 3 sunk into the sliding seat, the sliding seat 1 is provided with a first inner side wall 13, the first inner side wall 13 is used for forming part of inner side walls of a bead groove, the core 3 is provided with a convex part 34 forming the bead groove, the convex part 34 is provided with a first wall surface 33 and a second wall surface 32, the upper side wall of the first inner side wall 13 of the sliding seat is matched with the first wall surface 33 to form a second inner side wall of the bead groove, the lower side wall of the first inner side wall 13 of the sliding seat is matched with the second wall surface 32 to form a third inner side wall of the bead groove, and the lower side wall of the first inner side wall of the sliding seat is provided with a groove 11 along the axial direction of the groove;
S2, processing a part of the lower side wall of the first inner side wall of the sliding seat, which is close to the first inner side wall, into an arc-shaped convex curved surface 12, processing a part of the wall surface of the second wall surface 32 of the core, which is matched with the convex curved surface 12, into a concave curved surface 31, so that the gap between the convex curved surface 12 and the concave curved surface 31 is gradually reduced along the direction close to the first inner side wall, and a tapered groove structure 4 is formed at the gap;
S2, sliding the sliding seat 1 into the mold core 3, closing the mold, and performing secondary injection molding.
In this embodiment, the minimum gap between the lower sidewall of the first inner sidewall and the second wall surface of the sliding base is less than 0.05mm. After the die is clamped, the minimum gap between the lower side wall of the first inner side wall of the sliding seat and the second wall surface is 0.015-0.04 mm.
In this embodiment, the second wall surface is embedded in the groove, so as to further expand the outer end opening area of the tapered groove structure.
In this embodiment, the area where the tapered trench structure 4 is located constitutes a difficult-to-feed area, and the other areas are easy-to-feed areas 5.
When the secondary injection molding is started, the injection molding material firstly enters the easy-feeding area 5, and then is pressed into the tapered groove structure 4 under the action of pressure, because the contact area between the tapered groove structure 4 and the injection molding material is increased, the injection molding material entering the tapered groove structure 4 is cooled more rapidly, and further, the injection molding material is further ensured not to break through the tapered groove structure and enter the bead groove.
The present invention is not limited to the above embodiments, but is capable of modification and variation in detail, and other modifications and variations can be made by those skilled in the art without departing from the scope of the present invention.
Claims (5)
1. A method for preventing flash over injection molding by tapered channel structure, comprising the steps of:
S1, preparing a sliding seat and a mold matched with the sliding seat, wherein a core sunk into the sliding seat is arranged in the mold, the sliding seat is provided with a first inner side wall which is used for forming part of the inner side wall of the bead groove, the core is provided with a convex part which is used for forming the bead groove, the convex part is provided with a first wall surface and a second wall surface, the upper side wall of the first inner side wall of the sliding seat is matched with the first wall surface to form a second inner side wall of the bead groove, the lower side wall of the first inner side wall of the sliding seat is matched with the second wall surface to form a third inner side wall of the bead groove, and the lower side wall of the first inner side wall of the sliding seat is provided with a groove along the axial direction of the groove;
s2, processing a part of the side wall, adjacent to the first inner side wall, of the lower side wall of the first inner side wall of the sliding seat into an arc-shaped convex curved surface, processing a part of the wall surface, matched with the convex curved surface, of the second wall surface of the mold core into a concave curved surface, so that a gap between the convex curved surface and the concave curved surface is gradually reduced along the direction close to the first inner side wall, and a tapered groove structure is formed at the gap;
s2, sleeving the sliding seat into the mold core in a sliding manner, closing the mold, and performing secondary injection molding.
2. The method of preventing over-molded flash by tapered trench structure of claim 1, wherein: the minimum clearance between the lower side wall of the first inner side wall of the sliding seat and the second wall surface is smaller than 0.05mm.
3. The method of preventing over-molded flash by tapered trench structure of claim 1, wherein: the second wall surface is embedded into the groove.
4. The method of preventing over-molded flash by tapered trench structure of claim 1, wherein: the area where the tapered groove structure is located forms a difficult-feeding area, and other areas are easy-feeding areas.
5. The method of preventing over-molded flash by tapered trench structure of claim 1, wherein: after the die is clamped, the minimum gap between the lower side wall of the first inner side wall of the sliding seat and the second wall surface is 0.015-0.04 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111097399.6A CN114074401B (en) | 2021-09-18 | 2021-09-18 | Method for preventing flash of secondary injection molding through tapered groove structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111097399.6A CN114074401B (en) | 2021-09-18 | 2021-09-18 | Method for preventing flash of secondary injection molding through tapered groove structure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114074401A CN114074401A (en) | 2022-02-22 |
| CN114074401B true CN114074401B (en) | 2024-05-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111097399.6A Active CN114074401B (en) | 2021-09-18 | 2021-09-18 | Method for preventing flash of secondary injection molding through tapered groove structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114074401B (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017004857A1 (en) * | 2015-05-08 | 2017-01-12 | 涂波 | Shoe injection mold and shoe injection molding method using same |
| JP2020116838A (en) * | 2019-01-24 | 2020-08-06 | アイシン精機株式会社 | Mold for in-mold coating and in-mold coating method |
| CN112388902A (en) * | 2020-11-02 | 2021-02-23 | 王金祥 | Positioning method and jig for secondary injection molding of sliding seat |
-
2021
- 2021-09-18 CN CN202111097399.6A patent/CN114074401B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017004857A1 (en) * | 2015-05-08 | 2017-01-12 | 涂波 | Shoe injection mold and shoe injection molding method using same |
| JP2020116838A (en) * | 2019-01-24 | 2020-08-06 | アイシン精機株式会社 | Mold for in-mold coating and in-mold coating method |
| CN112388902A (en) * | 2020-11-02 | 2021-02-23 | 王金祥 | Positioning method and jig for secondary injection molding of sliding seat |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114074401A (en) | 2022-02-22 |
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