Product injection mold with flexible insert and injection molding process

Abstract

The present invention relates to the field of mold technology, and in particular to a product injection mold with a flexible insert and an injection molding process. It includes an upper mold, a lower mold and a pouring system, the upper mold is provided with a female mold, the lower mold is provided with a male mold, a cavity is formed between the male mold and the female mold, a movable part assembly is further provided inside the lower mold, and the movable part assembly is placed in the cavity, the movable part assembly includes a movable block and a driving part for driving the movable block to move in the lower mold, and a plurality of grooves for the installation of flexible inserts are provided on the movable part, the space of the grooves is arranged from wide to narrow from the outside to the inside, and some grooves are arranged at the glue inlet of the pouring system and at the boundary of the glue flow. The benefits of the present invention: This technology fixes the velvet sheet by setting grooves at the glue inlet and the pouring boundary, so that it will not move during the injection molding process and is easy to install.

Description

Technical Field

[0001] The present invention relates to the technical field of molds, and in particular to a product injection mold with a flexible insert and an injection molding process. Background Art

[0002] There is a kind of textile velvet sheet that is used as an insert and is injection molded together with the injection mold. However, during the injection molding process of the velvet sheet, the velvet sheet cannot be placed in a precise manner because it cannot be fitted with the contoured surface of the mother mold. The requirements for placement and the size and shape of the velvet sheet are very important. If it is too wide, it cannot be placed or may be twisted. If it is too narrow, it may not be fixed in place, and the product may be displaced during the injection molding process. All of the above situations will cause glue overflow on the surface of the velvet sheet.

[0003] The existing technology, application number: CN201610015885.1, is fixed and installed by attaching double-sided tape on the surface. However, tearing off the double-sided tape after injection molding will cause damage to the surface of the velvet sheet.

[0004] The existing technology, application number: CN201621084214.2, uses adsorption to fix the velvet sheet on the mother mold. However, the adsorption force will affect the glossiness of the velvet sheet surface and also damage the velvet sheet. Therefore, it is necessary to design a product injection mold and injection molding process that does not damage the outer surface of the flexible insert to solve the above problems. Summary of the Invention

[0005] The purpose of the present invention is to provide a product injection mold with a flexible insert to overcome the above-mentioned deficiencies in the current prior art.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A product injection mold with a flexible insert includes an upper mold, a lower mold and a pouring system, the upper mold is provided with a female mold, the lower mold is provided with a male mold, a cavity is formed between the male and female molds, a movable part assembly is further provided inside the lower mold, and the movable part assembly is placed in the cavity, the movable part assembly includes a movable block and a driving part that drives the movable block to move in the lower mold, and a plurality of grooves for installing flexible inserts are provided on the movable part, the space of the grooves is arranged from wide to narrow from outside to inside, and some grooves are arranged at the glue inlet of the pouring system and at the boundary of the glue flow.

[0008] Preferably, the bottom of the driving movable block is provided with an inclined guide end, and the driving member includes a driving cylinder and a driving block provided at the telescopic end of the driving cylinder.

[0009] Preferably, the driving member further includes an ejection limit block disposed in the lower die and an ejection spring for supporting the ejection limit block, and one side of the ejection limit block supports the movable block.

[0010] Preferably, a contoured surface for placing the flexible insert is provided on the master mold.

[0011] An injection molding process for a product injection mold having a flexible insert comprises the following steps:

[0012] S1. Several movable blocks are set in the mold. The movable blocks move to provide a certain tolerance space for the velvet sheet to be installed.

[0013] S2. grooves are provided on the movable block, and grooves are provided at the glue inlet of the pouring system and at the boundary where the glue flows;

[0014] S3. Manually insert the periphery of the velvet sheet that has been punched out to a certain size into the groove, and fix the periphery of the velvet sheet through the groove;

[0015] S4. After the velvet sheet is fixed, the movable block is reset to fit the velvet sheet to the contoured surface of the mold;

[0016] S5. The mold is closed for injection molding. The injection mold is pressed down, and the hot melt adhesive flows into the mold through the pouring system. During the transmission process, it is subjected to pressure, and the air pressure enters the mold cavity along the runner. The air pressure is applied to the velvet sheet, making the velvet sheet completely attached to the contoured surface of the mold. The hot melt adhesive flows into the cavity, flows along the cavity, and is formed after cooling.

[0017] The beneficial effects of the present invention are as follows: this technology fixes the velvet sheet by setting grooves at the glue inlet and the casting boundary, so that it will not move during the injection molding process and is easy to install. The velvet sheet is perfectly fitted on the contoured surface through the pressure of the injection mold itself and the pressure of the glue. It does not require too much skill to place the velvet sheet, making placement simpler, and the movable parts leave a certain space to tolerate the placement of the velvet sheet in the unlocked state, so it has a certain amount of movable space. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a diagram showing the placement of a velvet sheet in an injection mold for a product with a flexible insert according to the present invention;

[0019] Figure 2 This is a schematic diagram of the placement of a velvet sheet and the bonding of the mother mold to a product injection mold with a flexible insert according to the present invention;

[0020] Figure 3 This is a schematic diagram of an injection molding process of an injection mold for a product having a flexible insert according to the present invention;

[0021] Figure 4 This is a partial schematic diagram of a product injection mold with a flexible insert according to the present invention;

[0022] Figure 5 Schematic diagram of the movable parts assembly of a product injection mold with a flexible insert according to the present invention

[0023] In the figure: 1. Upper die; 2. Lower die; 21. Contouring surface; 4. Cavity; 5. Movable part assembly; 51. Movable block; 52. Driving part; 6. Groove; 521. Driving cylinder; 522. Driving block; 511. Ejection limit block; 512. Ejection spring; 7. Velvet sheet. DETAILED DESCRIPTION

[0024] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0025] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as limiting the present invention.

[0026] Reference Figures 1 to 3, a product injection mold with a flexible insert, which includes an upper mold 1, a lower mold 2 and a pouring system, the upper mold is provided with a female mold, the lower mold is provided with a male mold, and a cavity 4 is formed between the male mold and the female mold, and a movable part assembly 5 is further provided in the lower mold, and the movable part assembly 5 is placed in the cavity 4, the movable part assembly 5 includes a movable block 51 and a driving part 52 for driving the movable block 51 to move in the lower mold, and a plurality of grooves 6 for installing flexible inserts are opened on the movable part 51, and the space of the groove 6 is arranged from wide to narrow from outside to inside, and some grooves 6 are arranged at the glue inlet of the pouring system and at the boundary of the glue flow. In order to facilitate the velvet piece to be stuck in the groove 6 for fixation, the space of the groove is set from wide to narrow from the outside to the inside. After the velvet piece is stuck in the groove 6, the narrower the space, the easier it is to get the velvet piece stuck, thereby fixing the outside of the velvet piece; when the mold is closed for injection, the hot melt adhesive enters the cavity from the glue inlet. In order to prevent the velvet piece at the glue inlet from being dislocated, it is necessary to set a groove 6 at the glue inlet to fix the velvet piece, so that it will not be displaced by the hot melt adhesive when the glue is injected. Similarly, setting a groove 6 at the boundary has the same effect, fixing the velvet piece; a certain amount of space is made available through the movable part assembly 5 to tolerate the velvet piece in the unlocked state, giving a certain amount of activity space, reducing the difficulty of placing the velvet piece, and at the same time giving a certain tolerance to the size of the velvet piece.

[0027] The bottom of the driving movable block 51 is provided with an inclined guide end, and the driving member 52 includes a driving cylinder 521 and a driving block 522 provided at the telescopic end of the driving cylinder. The driving cylinder 521 drives the driving block 522, which in turn lifts and retracts the driving movable block 51.

[0028] The driving member 51 also includes an ejection limit block 511 disposed within the lower mold and an ejection spring 512 for supporting the ejection limit block 511. One side of the ejection limit block 511 supports the movable block 51. When the upper mold is closed and pressed downward, the movable block 51 is driven to continue to press downward, pressing the ejection limit block 511 and the ejection spring 512 downward, and the mold is automatically reset when it opens. Different driving members 52 are used to assist in driving the upper mold according to the location where the velvet sheet is placed.

[0029] The master mold is provided with a contoured surface 21 for placing the flexible insert. In order to facilitate the flexible insert to perfectly cooperate with the injection molded part for shaping, the contoured surface 21 is provided to fit with the velvet piece and cooperate with the injection molded part for injection molding.

[0030] An injection molding process for a product injection mold having a flexible insert comprises the following steps:

[0031] S1. Several movable blocks are set in the mold. The movable blocks move to provide a certain tolerance space for the velvet sheet to be installed.

[0032] S2. grooves are provided on the movable block, and grooves are provided at the glue inlet of the pouring system and at the boundary where the glue flows;

[0033] S3. Manually insert the periphery of the velvet sheet that has been punched out to a certain size into the groove, and fix the periphery of the velvet sheet through the groove;

[0034] S4. After the velvet sheet is fixed, the movable block is reset to fit the velvet sheet to the contoured surface of the mold;

[0035] S5. The mold is closed for injection molding. The injection mold is pressed down, and the hot melt adhesive flows into the mold through the pouring system. During the transmission process, it is subjected to pressure, and the air pressure enters the mold cavity along the runner. The air pressure is applied to the velvet sheet, making the velvet sheet completely attached to the contoured surface of the mold. The hot melt adhesive flows into the cavity, flows along the cavity, and is formed after cooling.

[0036] In the process of manually installing the velvet sheet, the manual master only needs to clip the corresponding velvet sheet corners into the groove and fix them, and does not need to worry about whether the other parts of the velvet sheet are in contact with the contoured surface. When the injection mold is injecting, the air pressure and temperature of the injection mold itself and the hot melt adhesive are pressed, and the air pressure and heat will first be pressed on the velvet sheet. The places where the velvet sheet is not in contact with the contoured surface will be pressed by the air pressure and will be in contact with the contoured surface. If the size of the velvet sheet has a slight deviation, it will shrink after being heated due to the characteristics of the velvet sheet itself, and the four sides are fixed by the groove, so the middle part will be completely in contact, and then the hot melt adhesive will be poured in and pressed on the velvet sheet. After flowing through the velvet sheet, the pressed velvet sheet will be more in contact with the contoured surface, thereby ensuring the accuracy of the velvet sheet placement, and the four sides are fixed without glue overflow, thereby ensuring the accuracy and quality of the processing, and being able to tolerate a certain size tolerance of the velvet sheet.

[0037] The groove is set as a barb setting in the movable block, and a fixed shape is set according to the velvet piece that needs to be fixed. It only needs to ensure that the velvet piece is fixed in the groove.

[0038] In this embodiment, grooves 6 are set according to the shape of the velvet piece and the position of the glue inlet. Grooves 6 are also set at the boundary of the glue flow, and a movable component 5 is set in conjunction with it. The movable component 5 is first pushed out, and the processed and cut velvet pieces are manually stuffed into the grooves 6 in sequence. After the velvet pieces are placed, the other positions do not need to be placed flat. It is only necessary to put the velvet pieces in the groove 6 position into the clamp, reset through the movable component 5, and drive the already clamped velvet pieces to fit on the contour surface of the mother mold, and then close the mold for injection molding. The upper mold moves down to start injection molding. Due to the characteristics of the velvet piece itself, it has a certain degree of flexibility and a certain degree of shrinkage. Through the air pressure, temperature and hot melt adhesive of the injection mold itself, the velvet piece flows along the gate. The velvet piece is squeezed and the hot melt adhesive is pressed to press the velvet piece that is not in contact with the contour surface, and injection molding is completed. Since the velvet piece in the groove 6 does not need to cooperate for injection molding, the groove 6 in this technology will not affect the entire injection molding, and it mainly needs to play a fixed limiting role.

[0039] Since the velvet sheet has a certain degree of flexibility and shrinkage, it will not loosen after being fixed in the groove 6 on all sides. Under the pressure and temperature of the injection mold, the velvet sheet fits the contoured surface. If there is a tolerance in the velvet sheet, if the size is large, it will shrink due to heat and fit the contoured surface. If the size is small, it will not shrink because it is fixed on all sides. In conjunction with the pressure and flow of the hot melt adhesive, the velvet sheet will further fit the contoured surface, so that the velvet sheet will not move and glue overflow will not occur.

[0040] The benefits of the present invention are that this technology fixes the velvet sheet by setting grooves at the glue inlet and the casting boundary, so that it will not move during the injection molding process and is easy to install. The velvet sheet is perfectly fitted on the contoured surface through the pressure of the injection mold itself and the pressure of the glue. It does not require too much skill to place the velvet sheet, making placement easier, and the movable parts leave a certain space to tolerate the placement of the velvet sheet in the unlocked state, so it has a certain amount of movable space.

[0041] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A product injection mold with a flexible insert, comprising an upper mold, a lower mold, and a gating system, wherein the upper mold is provided with a female mold, the lower mold is provided with a male mold, a cavity is formed between the male and female molds, and a movable part assembly is further provided within the lower mold, and the movable part assembly is placed in the cavity, characterized in that: The movable part assembly includes a movable block and a driving part that drives the movable block to move in the lower mold. The movable part is provided with a plurality of grooves for installing flexible inserts. The space of the grooves is arranged from wide to narrow from the outside to the inside, and some grooves are arranged at the glue inlet of the casting system and the boundary of the glue flow; the bottom of the driving movable block is provided with an inclined guide end, the driving part includes a driving cylinder and a driving block arranged at the telescopic end of the driving cylinder, the driving part also includes an ejection limit block placed in the lower mold and an ejection spring for supporting the ejection limit block, and one side of the ejection limit block supports the movable block.

2. The product injection mold with a flexible insert according to claim 1, characterized in that: The master mold is provided with a contoured surface for placing the flexible insert.

3. The injection molding process of a product injection mold with a flexible insert according to any one of claims 1-2, characterized in that: The following steps are involved: S1. Several movable blocks are set in the mold. The movable blocks move to provide a certain tolerance space for the velvet sheet to be installed. S2. grooves are provided on the movable block, and grooves are provided at the glue inlet of the pouring system and at the boundary of the glue flow; S3. Manually insert the periphery of the velvet sheet that has been punched out to a certain size into the groove, and fix the periphery of the velvet sheet through the groove; S4. After the velvet sheet is fixed, the movable block is reset to fit the velvet sheet to the contoured surface of the mold; S5. The mold is closed for injection molding. The injection mold is pressed down, and the hot melt adhesive flows into the mold through the pouring system. During the transmission process, it is subjected to pressure, and the air pressure enters the mold cavity along the runner. The air pressure is applied to the velvet sheet, making the velvet sheet completely attached to the contoured surface of the mold. The hot melt adhesive flows into the cavity, flows along the cavity, and is formed after cooling.

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