CN211030967U - Secondary injection molding device - Google Patents
Secondary injection molding device Download PDFInfo
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- CN211030967U CN211030967U CN201921858704.7U CN201921858704U CN211030967U CN 211030967 U CN211030967 U CN 211030967U CN 201921858704 U CN201921858704 U CN 201921858704U CN 211030967 U CN211030967 U CN 211030967U
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Abstract
The utility model discloses a secondary injection molding device, which comprises a primary injection mold and a secondary injection mold, wherein a first upper mold of the primary injection mold is provided with at least two positioning molding cavities; the blank is injected in an injection mold to form a one-step forming part with a positioning structure matched with the shape of the positioning forming cavity; the secondary injection mold comprises a second upper mold and a second lower mold, the primary forming part is placed in a forming cavity of the second lower mold, the second upper mold is provided with a limiting structure matched with the positioning structure, the positioning structure of the injection molding is used as a positioning reference during secondary injection molding, the injection molding quality is improved, and the product appearance is improved.
Description
Technical Field
The utility model relates to an injection mold technical field, in particular to secondary injection moulding device.
Background
Before the existing mobile phone shell is subjected to injection molding, a blank is firstly subjected to CNC (computer numerical control) machining to form a positioning hole and other structures, the positioning hole is used for accurately placing the blank in an injection mold, but the deviation of the precision of the positioning hole is caused frequently due to machining errors such as jigs during CNC machining, so that the blank cannot be accurately positioned on the mold, the consistency of the size and the shape of a product after injection molding is difficult to keep, the quality is difficult to control, the reason is also one, the CNC machining positioning datum is different from the injection molding positioning datum in the mold, and the accumulated deviation is easy to cause.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a secondary injection moulding device, the stock forms location structure in an injection mold, do benefit to this location structure as the location benchmark when the secondary is moulded plastics, reduce the deviation, improve positioning accuracy, thereby improve the quality of moulding plastics, it carries out CNC processing out the locating hole earlier to have solved the stock, place later in injection mold and carry out injection moulding, there is the deviation because of the locating hole precision that adds is not enough and/or the secondary location benchmark is different to lead to injection moulding piece size and shape, and the locating hole can not shield the problem that influences the outward appearance. .
To achieve the purpose, the utility model adopts the following technical proposal:
the secondary injection molding device comprises a primary injection mold and a secondary injection mold, wherein the primary injection mold comprises a first upper mold and a first lower mold, and the first upper mold is provided with at least two positioning molding cavities; the first lower die is provided with a first fixed cavity for placing blanks;
the blank is injected in an injection mold to form a one-step forming part with a positioning structure matched with the shape of the positioning forming cavity;
the secondary injection mold comprises a second upper mold and a second lower mold which form a secondary injection molding cavity, the primary molding part is placed in the molding cavity of the second lower mold, and the second upper mold is provided with a limiting structure matched with the positioning structure.
From this, the stock forms location structure in injection mold, later place once formed part in secondary injection mold and carry out injection moulding for the second time, secondary injection mold is equipped with the structure of injecing with location structure matched with, make once formed part can be accurate place in secondary injection mold, thus, location structure is as the location benchmark when secondary is moulded plastics, location structure and limit structure's cooperation reduces the benchmark skew, make secondary's that secondary is moulded plastics and forms dimension degree and shape degree more accurate, solved the stock and carried out CNC earlier and processed out the locating hole, later place in injection mold and carry out injection moulding, because of the locating hole precision that adds is not enough and/or secondary location benchmark difference leads to injection moulding part size and shape to have the deviation, and the locating hole can not shield the problem that influences the outward appearance.
In some embodiments, the positioning structure is a positioning column and the limiting structure is a limiting groove.
Therefore, the positioning structure can also be a positioning edge or a positioning groove and the like, the positioning column has a simpler structure and is easier to be injection molded, the corresponding limiting structure can also adopt a slotted hole structure or a needle column structure, and the limiting groove is matched with the positioning column to be easier to be manufactured and molded.
In some embodiments, the positioning and forming cavity further comprises a first step groove and a second step groove, wherein the second step groove is arranged at the bottom of the first step groove; the second step groove is used for forming the positioning column, and the first step groove is used for forming a step of the one-step forming piece.
Therefore, the first step groove is arranged to form a step structure of the one-step forming piece, on one hand, the mechanical strength of the positioning column is strengthened, and on the other hand, a certain limiting function is also achieved.
In some embodiments, the positioning molding cavities include a first positioning molding cavity, a second positioning molding cavity and a third positioning molding cavity, and the first positioning molding cavity and the second positioning molding cavity are mirror-symmetrical with respect to a longitudinal center plane of the first upper mold; the second positioning forming cavity and the second positioning forming cavity are in mirror symmetry relative to the transverse central plane of the first upper die
From this, the location becomes the die cavity and is equipped with threely, and the three corner department of once injection mold die cavity is once located of locating of different lines forms effective location in controlling and upper and lower direction, improves positioning accuracy.
In some embodiments, the first upper die is further provided with a balancing forming cavity.
Therefore, in order to improve the injection molding process, the balance molding cavity is arranged to be beneficial to balancing the pressure and the flow velocity of a pouring system, the pouring pressure during injection molding is equally divided, and the stress of the mold is more uniform.
In some embodiments, the balancing molding cavity is provided on a region of the first positioning molding cavity on a side mirrored with respect to the transverse center plane.
Therefore, the balance molding cavity and the three positioning molding cavities form a balance pouring system which is distributed in a rectangular shape.
In some embodiments, the step has a height that is no greater than the thickness of the step perimeter formed in the overmolding process.
Therefore, after the secondary injection molding, the steps do not protrude out of the inner surface of the secondary molded part, and the appearance is improved.
In some embodiments, the second step groove is connected to the gate.
Therefore, the second-step groove is connected with the pouring gate, so that the injection molding is facilitated, and the structure is simplified.
A secondary injection molding process of a mobile phone shell comprises a secondary injection molding device, and comprises the following steps:
step 1: placing the blank in a primary injection mold for injection molding to form a primary molded part with a positioning structure;
step 2: placing the primary formed part in a secondary injection mold, matching the positioning structure with the limiting structure, and performing injection molding to form a secondary formed part;
and step 3: and carrying out CNC machining on the secondary forming part, and milling and opening the inner bottom surface to form a finished product.
From this, form location structure in being prior to an injection mold with the stock, later regard as the location benchmark with location structure, secondary injection mold is equipped with matched with limit structure, and location structure reduces the benchmark skew with limit structure cooperation to improve the precision of moulding plastics, at last with location structure CNC excision formation final cell-phone shell finished product.
In some embodiments, the positioning structure in step 1 is a positioning post; the limiting structure in the step 2 is a limiting groove.
The utility model has the advantages that: the blank forms positioning structures such as positioning columns in the primary injection molding, and the positioning structures are utilized to perform positioning injection molding in a secondary injection mold, so that the positioning precision is improved, the injection molding quality is improved, the manufacturing process is simplified, and the production efficiency is improved;
moreover, three positioning structures such as positioning columns are arranged, so that the position of the blank is effectively and accurately limited, and the phenomena of position deviation and the like are not easy to occur;
moreover, the balance forming cavity is arranged, so that a pouring system is balanced, the pouring pressure and the flow velocity are more uniform, the injection molding of a positioning structure is facilitated, and the injection molding process is improved;
and finally, the positioning structure is formed on the inner surface of the product and is cut off by CNC (computer numerical control) machining, and the appearance of the product cannot be adversely affected in the whole injection molding process.
Drawings
FIG. 1 is a structural diagram of a primary injection mold of the secondary injection molding device of the present invention;
FIG. 2 is a first upper mold structure view of a primary injection mold of the secondary injection molding apparatus of the present invention;
FIG. 3 is an enlarged view of a portion of FIG. 2;
FIG. 4 is a partial enlarged view of FIG. 2 at B;
FIG. 5 is a first lower mold structure view of a primary injection mold of the secondary injection molding apparatus of the present invention;
FIG. 6 is a structural diagram of a secondary injection mold of the secondary injection molding apparatus of the present invention;
FIG. 7 is a second upper mold structure view of the secondary injection mold of the secondary injection molding apparatus of the present invention;
FIG. 8 is a second lower mold structure view of the secondary injection mold of the secondary injection molding apparatus of the present invention;
FIG. 9 is a diagram of the structure of the blank of the present invention;
FIG. 10 is a view showing a structure of a primary molded part of the present invention;
FIG. 11 is a schematic view of the secondary molding structure of the present invention;
FIG. 12 is a schematic diagram of the present invention;
wherein: 1-one-time injection molding; 11-a first upper die; 111-positioning a forming cavity; 1111-first order groove; 1112-a second step groove; 10-a first positioning and forming cavity; 20-a second positioning and forming cavity; 30-a third positioning and forming cavity; 112-a balancing forming cavity; 1121-third step groove; 1122-fourth order groove; 12-a first lower die; 21-a first fixed cavity; 2-secondary injection molding; 21-a second upper die; 211-a limiting groove; 22-a second lower die; 3-a blank; 4-one-shot forming; 41-step; 42-a positioning column; 43-a balance step; 44-a balancing column; 5-overmolding; 6-finished product.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1 to 12, the secondary injection molding device includes a primary injection mold 1 and a secondary injection mold 2, the primary injection mold 1 includes a first upper mold 11 and a first lower mold 12, and the first upper mold 11 is provided with at least two positioning molding cavities 111; the first lower die 12 is provided with a first fixing cavity 121 for placing the blank 3;
the blank 3 is injection molded in a primary injection mold 1 to form a primary molding part 4 with a positioning structure matched with the shape of the positioning molding cavity 111;
the secondary injection mold 2 comprises a second upper mold 21 and a second lower mold 22 which form a secondary injection molding cavity, the primary molded part 4 is placed in the molding cavity of the second lower mold 22, and the second upper mold 21 is provided with a limiting structure matched with the positioning structure.
Further, the positioning structure is a positioning post 42, and the limiting structure is a limiting groove 211.
Further, the positioning molding cavity 111 includes a first step groove 1111 and a second step groove 1112, and the second step groove 1112 is provided at the bottom of the first step groove 1111; the second step groove 1112 is used for molding the positioning column 42, and the first step groove 1111 is used for molding the step 41 of the one-time molded part 4.
2-4, the positioning molding cavity 111 includes a first positioning molding cavity 10, a second positioning molding cavity 20 and a third positioning molding cavity 30, and the first positioning molding cavity 10 and the second positioning molding cavity 20 are mirror-symmetrical with respect to the longitudinal central plane of the first upper mold 11; the second positioning and forming cavity 20111 and the second positioning and forming cavity 20111 are mirror-symmetrical relative to the transverse central plane of the first upper die 11
Further, the first upper mold 11 is further provided with a balance forming cavity 112.
Further, the balancing cavity 112 is provided in the area of the side of the first positioning cavity 10 which is mirrored with respect to the transverse center plane.
Further, the height of the step 41 is not greater than the thickness of the periphery of the step 41 formed in the secondary injection molding.
Further illustrated, the second step groove 1112 is connected to the gate.
A secondary injection molding process of a mobile phone shell comprises a secondary injection molding device, and comprises the following steps:
step 1: placing the blank 3 in a primary injection mold 1 to be injection molded into a primary molded part 4 with a positioning structure;
step 2: placing the primary formed part 4 in the secondary injection mold 2, matching the positioning structure with the limiting structure, and performing injection molding to form a secondary formed part 5;
and step 3: and carrying out CNC machining on the secondary formed part 5, and milling and opening the inner bottom surface to form a finished product 6.
Further, the positioning structure in step 1 is a positioning post 42; the position-limiting structure in step 2 is a position-limiting groove 211.
The working principle is as follows:
the secondary injection molding device comprises a primary injection mold 1 and a secondary injection mold 2, a first upper mold 11 of the primary injection mold 1 is provided with a positioning molding cavity 111 for molding a positioning column 42, a blank 3 is injected into the primary molding part 4 through the primary injection mold, the positioning column 42 of the primary molding part 4 is used as a positioning reference to be placed in the secondary injection mold 2 for secondary injection molding, a second upper mold 21 of the secondary injection mold 2 is provided with a limiting groove 211 matched with the positioning column 42, the precision of the injection molded positioning column 42 is higher due to higher manufacturing precision of the mold, and the deviation caused by reference deviation is reduced by using the injection molded positioning column 42 as a reference, so that the high-precision structure can protect the size and shape of a molded product.
In order to further improve the positioning accuracy and reduce the offset in the left-right direction and/or the up-down direction during positioning as much as possible, the three positioning forming cavities 111 are arranged in non-collinear three positions and distributed at three corners of the forming cavity of the first upper die 11, and the non-collinear three points can limit the position of one surface, so that three positioning columns 42 can be formed when the three positioning forming cavities 111 are arranged for injection molding, and the positioning accuracy is effectively improved.
The unbalanced design of the pouring system may cause poor molding of the injection molding part, such as incomplete molding, deformation or severe shrinkage, and in order to improve the balance of the pouring system and improve the injection molding process, a balance molding cavity 112 is disposed at the last corner of the molding cavity of the first upper mold 11, and is approximately uniformly distributed at the four corners of the molding cavity together with the three positioning molding cavities 111, so that the flow direction and pressure of the runner tend to be more uniform, and the injection molding of the positioning column 42 is more facilitated. The corresponding primary molded part 4 is injection molded with a balance step 4341 and a balance post 44.
The primary formed part 4 forms the secondary formed part 5 after injection molding in the secondary injection mold 2, carries out CNC with reference column 42 isotructure in the secondary formed part 5 and gets rid of, forms cell-phone shell finished product 6, and the surface is not processed.
Therefore, the product after the secondary injection molding does not have the bad phenomena of influencing the appearance quality of the product, such as manufacturing traces, processing structures and the like on the outer surface of the product, and the injection molding precision and the product quality are improved by using the positioning column 42 formed by injection molding as a positioning reference.
The secondary injection molding process can be used for plastic injection molding and can also be used for ceramic injection molding. The positioning structure on the primary molded part 4 can be designed into a positioning edge or a positioning groove or other structures besides the positioning column 42, and is properly selected according to different products. When the positioning groove is designed to be a positioning groove, the positioning groove is approximately a hollow ring column, the groove hole is a blind hole which is not communicated, and the secondary injection mold 2 is provided with a limiting needle and other structures which are matched with the secondary injection mold.
The above are only some embodiments of the present invention. For those skilled in the art, without departing from the inventive concept, several modifications and improvements can be made, which are within the scope of the invention.
Claims (8)
1. The secondary injection molding device is characterized by comprising a primary injection mold (1) and a secondary injection mold (2), wherein the primary injection mold (1) comprises a first upper mold (11) and a first lower mold (12), and the first upper mold (11) is provided with at least two positioning molding cavities (111); the first lower die (12) is provided with a first fixing cavity (121) for placing the blank (3);
the blank (3) is injection-molded in the primary injection mold (1) to form a primary molded part (4) with a positioning structure conforming to the shape of the positioning molding cavity (111);
secondary injection mold (2) are including forming mould (21) and second lower mould (22) on the second of secondary injection moulding chamber, once formed part (4) are placed in the shaping intracavity of second lower mould (22), mould (21) are equipped with on the second with location structure matched with limit structure.
2. The secondary injection molding apparatus as claimed in claim 1, wherein the positioning structure is a positioning post (42) and the limiting structure is a limiting groove (211).
3. The apparatus of claim 2, wherein the positioning and forming cavity (111) further comprises a first step groove (1111) and a second step groove (1112), the second step groove (1112) being provided at a bottom of the first step groove (1111); the second-step groove (1112) is used for forming the positioning column (42), and the first-step groove (1111) is used for forming the step (41) of the primary formed part (4).
4. The two-shot molding apparatus according to claim 3, wherein the positioning and forming cavities (111) include a first positioning and forming cavity (10), a second positioning and forming cavity (20), and a third positioning and forming cavity (30), and the first positioning and forming cavity (10) and the second positioning and forming cavity (20) are mirror-symmetrical with respect to a longitudinal center plane of the first upper mold (11); the second positioning forming cavity (20) and the second positioning forming cavity (20) are in mirror symmetry relative to the transverse central plane of the first upper die (11).
5. The two-shot molding apparatus according to claim 4, wherein the first upper mold (11) is further provided with a balance molding cavity (112).
6. An apparatus according to claim 5, wherein the balancing cavity (112) is provided in a region on a side of the first positioning cavity (10) mirrored with respect to the transverse central plane.
7. An apparatus according to claim 3, wherein the height of the step (41) is not greater than the thickness of the periphery of the step (41) formed in the secondary injection molding.
8. The two-shot molding apparatus according to claim 3, wherein said second-step groove (1112) is connected to the sprue gate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921858704.7U CN211030967U (en) | 2019-10-31 | 2019-10-31 | Secondary injection molding device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921858704.7U CN211030967U (en) | 2019-10-31 | 2019-10-31 | Secondary injection molding device |
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| CN211030967U true CN211030967U (en) | 2020-07-17 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112721024A (en) * | 2020-11-30 | 2021-04-30 | 山东科技大学 | Manufacturing die and manufacturing method of conductivity probe of thermohaline depth measuring instrument |
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2019
- 2019-10-31 CN CN201921858704.7U patent/CN211030967U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112721024A (en) * | 2020-11-30 | 2021-04-30 | 山东科技大学 | Manufacturing die and manufacturing method of conductivity probe of thermohaline depth measuring instrument |
| CN112721024B (en) * | 2020-11-30 | 2022-04-01 | 山东科技大学 | Manufacturing die and manufacturing method of conductivity probe of thermohaline depth measuring instrument |
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