CN114074401A - Method for preventing secondary injection molding flash through tapered groove structure - Google Patents
Method for preventing secondary injection molding flash through tapered groove structure Download PDFInfo
- Publication number
- CN114074401A CN114074401A CN202111097399.6A CN202111097399A CN114074401A CN 114074401 A CN114074401 A CN 114074401A CN 202111097399 A CN202111097399 A CN 202111097399A CN 114074401 A CN114074401 A CN 114074401A
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- China
- Prior art keywords
- side wall
- wall
- slide seat
- groove
- injection molding
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Links
- 238000001746 injection moulding Methods 0.000 title claims abstract description 36
- 238000000034 method Methods 0.000 title claims abstract description 21
- 239000011324 bead Substances 0.000 claims abstract description 26
- 238000000465 moulding Methods 0.000 claims description 8
- 239000012778 molding material Substances 0.000 description 12
- 230000008569 process Effects 0.000 description 5
- 230000008859 change Effects 0.000 description 4
- 239000004033 plastic Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000004075 alteration 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
- 238000001816 cooling Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 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
- 238000007789 sealing Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
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 secondary injection molding flash through a tapered groove structure, which comprises the steps of preparing a slide seat and a mold matched with the slide seat, wherein a mold core sunk into the slide seat is arranged in the mold, the slide seat is provided with a first inner side wall, the first inner side wall is used for forming part of the inner side wall of a bead groove, the mold core is provided with a convex part 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 slide 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 slide 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 slide seat is provided with a groove along the axial direction of the slide seat; in the method, the groove is matched with the second wall surface to form a tapered groove structure, so that the area can not generate the flash phenomenon 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 as beer covering or rubber coating. It is similar to the double-color forming process, but has a larger difference with the double-color forming process. The method is a process for molding a certain plastic raw material in a primary plastic mold, taking out the molded part, and injecting the same or another plastic material into a secondary molding mold again. More complicated is the multiple molding, which makes the shape and process of the plastic product meet the desired requirements, called the two-shot molding. Of course, the metal workpiece is coated with a corresponding injection-molded part, also referred to as overmolding.
In the field of guide devices, in particular linear motion guides, comprising a linear slide and a slide that moves on the slide; in order to ensure the smoothness of the sliding seat moving on the sliding rail, the sliding seat is required to be provided with balls, so that the sliding seat is subjected to secondary injection molding to form an injection molding part, and the injection molding part is provided with a ball circulation passage (a ball groove) for moving the balls, and an upper retainer, a middle retainer and a lower retainer which are used for sealing and preventing dust of the ball circulation passage and are kept in contact with the sliding rail.
When the slide is subjected to secondary injection molding to form an injection molding part with a corresponding shape on the slide, particularly when a bead groove structure is formed, the bead groove is formed by an inner side wall (defined as a first inner side wall) of the slide and injection molding materials attached to two sides of the inner side wall of the slide, 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 adhesion and certain strength, the inner side wall of the slide, which is in contact with the injection molding materials, is concave, so that the contact area of the injection molding materials and the using 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 constituting the third inner side wall is in the shape of a straight surface 21 (the straight surface is made because the processing is simple and the production cost is reduced), the third inner side wall of the bead groove formed by the straight surface 21 has an axial straight surface, and the existence of the straight surface makes a gap between the third inner side wall and the edge of the concave part in the slide seat too large, so that when the secondary injection molding is performed, the injection molding material has a certain risk of escaping into the bead groove, and the inner side wall of the bead groove has some protrusions and is no longer a smooth inner side wall meeting the design requirements. Therefore, there is a need for an improvement in the method of performing the secondary injection molding of the bead groove to ensure that no flash occurs during the secondary injection molding.
Disclosure of Invention
In view of the above, it is desirable to provide a method for preventing flash in secondary injection molding by using 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 secondary injection molding flash through a tapered groove structure comprises the following steps:
s1, preparing a slide seat and a mould matched with the slide seat, wherein the mould is internally provided with a core sunk into the slide seat, the slide 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 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 slide 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 slide 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 slide seat is provided with a groove along the axial direction of the first inner side wall;
s2, processing a part of the side wall 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, and processing a part of the wall surface of the second wall surface of the mold core, which is matched with the convex curved surface, into an 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 gradually-reduced groove structure is formed at the position;
and S2, sliding the sliding seat into the core, closing the mold, and performing secondary injection molding.
Further, 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 0.05 mm.
Further, after the die is closed, 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 in the groove.
Furthermore, the area where the tapered groove structure is located forms an area difficult to feed, and other areas are areas easy to feed.
Compared with the prior art, the invention has the following beneficial effects: according to the method, the gradually-reduced groove structure is formed between the sliding seat and the mold core, and by the structure, when the sliding seat is subjected to secondary injection molding to form the bead groove structure, the injection molding material cannot protrude into the inner side wall of the bead groove, namely, the flash phenomenon is avoided, the structure is simple, and the yield of products is effectively improved.
In order to make the aforementioned and other objects, features and advantages of the invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
FIG. 1 is a schematic structural diagram of a current injection molding structure.
Fig. 2 is a schematic structural diagram of an embodiment of the present invention.
Fig. 3 is a schematic diagram of a partially 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 mold core, 21-straight surface, 3-mold 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
To further illustrate the technical means and effects of the present invention adopted to achieve the predetermined objects, the following detailed description of the embodiments, structures, features and effects according to the present invention will be made with reference to the accompanying drawings and preferred embodiments.
As shown in fig. 2-3, a method for preventing flash in secondary injection molding by a tapered groove structure comprises the following steps:
s1, preparing a slide seat 1 and a mold matched with the slide seat, wherein the mold is internally provided with a core 3 sunk into the slide seat, the slide seat 1 is provided with a first inner side wall 13, the first inner side wall 13 is used for forming part of the inner side wall of the 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 slide seat is matched with the first wall surface 33 to form the second inner side wall of the bead groove, the lower side wall of the first inner side wall 13 of the slide seat is matched with the second wall surface 32 to form the third inner side wall of the bead groove, and the lower side wall of the first inner side wall of the slide seat is provided with a groove 11 along the axial direction of the slide seat;
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, and processing a part of the second wall surface 32 of the mold core, which is matched with the convex curved surface 12, into an inner concave curved surface 31, so that the gap between the convex curved surface 12 and the inner concave curved surface 31 is gradually reduced along the direction close to the first inner side wall, and a gradually-reduced groove structure 4 is formed at the position;
and S2, sliding the sliding seat 1 into the core 3, closing the mold, and performing secondary injection molding.
In this embodiment, a minimum gap between the lower sidewall of the first inner sidewall of the sliding seat and the second wall surface is less than 0.05 mm. After the die is closed, 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 region of the tapered groove structure.
In this embodiment, the region where the tapered groove structure 4 is located constitutes a region difficult to be fed, and the other regions are regions easy to be fed 5.
When beginning the secondary, the injection molding material gets into easily pan feeding region 5 earlier, then the gradual change groove structure 4 of impressing under the pressure effect, because gradual change groove structure 4 leads to its area of contact increase with the injection molding material, gets into the more quick cooling of the injection molding material of gradual change groove structure 4, and then further assurance injection molding material can not break through gradual change groove structure and get into in the pearl ditch inslot.
Although the present invention has been described with reference to the preferred embodiments, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (5)
1. A method for preventing secondary injection molding flash through a tapered groove structure is characterized by comprising the following steps:
s1, preparing a slide seat and a mould matched with the slide seat, wherein the mould is internally provided with a core sunk into the slide seat, the slide 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 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 slide 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 slide 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 slide seat is provided with a groove along the axial direction of the first inner side wall;
s2, processing a part of the side wall 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, and processing a part of the wall surface of the second wall surface of the mold core, which is matched with the convex curved surface, into an 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 gradually-reduced groove structure is formed at the position;
and S2, sliding the sliding seat into the core, closing the mold, and performing secondary injection molding.
2. The method of claim 1 for preventing flash over-molding by a tapered trench structure, wherein: the minimum clearance between the second wall face and the lower lateral wall of the first inside wall of slide is less than 0.05 mm.
3. The method of claim 1 for preventing flash over-molding by a tapered trench structure, wherein: the second wall surface is embedded in the groove.
4. The method of claim 1 for preventing flash over-molding by a tapered trench structure, wherein: the area where the tapered groove structure is located forms an area difficult to feed, and other areas are areas easy to feed.
5. The method of claim 1 for preventing flash over-molding by a tapered trench structure, wherein: after the die is closed, 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 true CN114074401A (en) | 2022-02-22 |
| CN114074401B CN114074401B (en) | 2024-05-17 |
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| 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 |
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| 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 |
|---|---|
| CN114074401B (en) | 2024-05-17 |
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