Forming die for multiple back-off pieces

Abstract

The invention relates to the technical field of injection molds, and provides a multi-back-off piece forming mold which comprises a mold body used for forming a first product, and the first product is provided with an inclined cylinder structure, an outer wall back-off part and a groove structure; comprising a movable mold and a fixed mold, the movable mold comprises a movable mold base, and a movable mold plate is installed on the movable mold base; a first product demolding mechanism is further arranged on the movable mold and comprises an inclined loose core arranged on the movable mold base in a sliding mode, and an inclined driving piece used for driving the inclined loose core to slide is further arranged on the movable mold base; an outer wall back-off sliding block is fixedly arranged on the inclined loose core; a linkage block is further fixedly arranged on the inclined loose core, and a groove sliding block is arranged on the movable mold plate in a sliding mode; the inclined loose core is further provided with a loose core sliding groove, and the loose core sliding groove is connected with the inclined barrel loose core in a sliding mode. Therefore, the outer wall back-off sliding block, the linkage block and the inclined cylinder loose core are arranged on the inclined loose core, and demolding of multiple back-off structures facing different directions is achieved in a limited space. The structure is compact, and forming of complex products is achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of injection molds, and in particular relates to a multi-undercut molding mold. Background Art

[0002] When the injection molded product has an undercut structure that forms a certain angle with the parting surface, demoulding is usually achieved by means of a tilting ejector or core pulling.

[0003] For products with complex structures, such as Figure 1 As shown, there is an inclined cylinder structure 101 with a certain angle between the central axis and the parting surface, and the outer wall of the inclined cylinder and the parting surface also form a certain angle, forming an outer wall undercut 102; at the same time, it also has a groove structure 103. A product has multiple undercut structures with different mold opening directions, and the distribution of the undercut structures is relatively concentrated. If the existing demoulding method is used, it is impossible to set multiple inclined tops or core pulls with different moving directions in a limited space, making the molding of such products a problem.

[0004] In summary, the prior art obviously has inconveniences and defects in practical use, so it is necessary to improve it. Summary of the invention

[0005] In view of the above-mentioned defects, the present invention mainly provides a multi-undercut molding die to solve the technical problem of molding products with multiple undercut structures and different mold opening directions.

[0006] In order to solve the above problems, the present invention provides a multi-undercut molding die, including a molding die for molding a product, wherein the product has an inclined cylinder structure, an outer wall undercut and a groove structure; including a movable die and a fixed die, wherein the movable die includes a movable die seat, and a movable die plate is installed on the movable die seat;

[0007] The movable mold is also provided with a product demoulding mechanism; the product demoulding mechanism includes an oblique core puller slidably provided on the movable mold base, and the movable mold base is also provided with an oblique driving member for driving the oblique core puller to slide;

[0008] The oblique core pulling device is fixedly provided with an outer wall undercut slider for forming an outer wall undercut of the product; the oblique core pulling device is also fixedly provided with a linkage block, and the linkage block has a retreat groove; the movable plate is slidably provided with a groove slider for forming a groove structure of the product; the groove slider is in sliding cooperation with the retreat groove;

[0009] The oblique core pulling device is also provided with a core pulling groove, and the core pulling groove is slidably connected to form the oblique cylinder core pulling device of the oblique cylinder structure; a blind hole is provided inside the oblique cylinder core pulling device, and a core pulling spring is provided in the blind hole, and the lower end of the core pulling spring abuts against the oblique core pulling device.

[0010] According to the multi-undercut forming mold of the present invention, the forming mold forms two products at the same time; two sets of outer wall undercut sliders and oblique cylinder core pulling are symmetrically arranged on the oblique core pulling; two retreat grooves are symmetrically opened on the linkage block; and two groove sliders are symmetrically arranged on the movable template.

[0011] According to the multi-undercut forming mold of the present invention, the fixed mold is fixedly connected to a driving block, and a driving column is fixedly arranged on the driving block; and a driving hole for slidingly plugging with the driving column is opened on the inclined cylinder core puller.

[0012] According to the multi-undercut forming die of the present invention, a guide groove is provided on the oblique core pulling, and a support block which is slidably matched with the guide groove is fixed on the movable die seat.

[0013] According to the multi-undercut forming die of the present invention, the oblique driving member is an oblique pull cylinder.

[0014] According to the multi-undercut forming die of the present invention, a limiting block is provided in the core-pulling chute.

[0015] The multi-undercut molding die according to the present invention is also used for molding product 2, and the side wall of product 2 has a barb structure; the molding die is also provided with a demoulding mechanism for product 2; the demoulding mechanism for product 2 includes a slide member fixedly arranged on the fixed mold; the slide member is provided with a molding slide;

[0016] The forming slide is slidably connected to the forming slide; a spring hole is provided on the forming slide, and an ejection spring is provided in the spring hole; two ends of the ejection spring abut against the fixed mold and the forming slide respectively; the forming slide is slidably arranged on the movable mold plate;

[0017] A barb top block for forming a barb structure is also slidably provided on the forming slide block; and a top block spring for pushing the barb top block to move relative to the forming slide block is also provided in the forming slide block.

[0018] According to the multi-undercut forming die of the present invention, a sleeve rod is also fixedly connected to the fixed die, and the ejection spring is sleeved on the sleeve rod.

[0019] According to the multi-barrel forming mold of the present invention, one end of the barb top block is fixedly connected to the stop block, and the top block spring is clamped between the stop block and the barb top block; and a guide surface is provided at the front end of the barb top block.

[0020] According to the multi-undercut forming die of the present invention, a slide plate is fixedly arranged on the movable plate, and the forming slider is slidably fitted with the slide plate.

[0021] In summary, the present invention realizes demoulding of multiple undercut structures with different directions in a limited space by arranging an outer wall undercut slider, a linkage block and an oblique cylinder core puller on the oblique core puller. The structure is compact and the molding of complex products is realized. The molding mold of the present invention is also provided with a demoulding mechanism for product 2; by arranging a barb top block on the molding slider, the effect of elastic force is utilized to delay demoulding of the barb structure of product 2 when the mold is opened to avoid damage. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of product 1 of the present invention;

[0023] Figure 2 It is a structural schematic diagram of product 2 of the present invention;

[0024] Figure 3 It is a structural schematic diagram of the forming mold of the present invention;

[0025] Figure 4 yes Figure 3 Schematic diagram of the structure of the local area;

[0026] Figure 5 yes Figure 4 A partial cutaway schematic diagram of a demoulding mechanism of a product;

[0027] Figure 6 yes Figure 4 A schematic structural diagram of a product-ejection mechanism from one direction;

[0028] Figure 7 It is a partial cross-sectional schematic diagram of a second demoulding mechanism of a product of the present invention from a first viewing direction;

[0029] Figure 8 It is a structural schematic diagram of the working principle of the second demoulding mechanism of the product of the present invention;

[0030] Fig. 9 It is a partial cross-sectional schematic diagram of a second demoulding mechanism of a product of the present invention from a first viewing direction;

[0031] In the figure: 1-movable die seat, 11-movable die plate, 12-support block, 13-slide plate, 14-hook block, 15-thrust block; 2-oblique core pulling, 21-outer wall undercut slider, 22-oblique pull cylinder, 24-cooling water pipe, 25-guide groove, 26-linkage block, 261-retreat groove; 27-groove slider, 28-core pulling slide, 281-limiting block; 3-oblique cylinder core pulling, 31-core pulling spring; 4-driving block, 41-driving column; 5-molding slider, 51-ejection spring, 52-barb ejector block, 521-introduction surface; 53-sleeve rod, 54-ejector block spring, 55-stop block; 6-slide member, 61-connecting rod, 62-molding slide; 100-product one, 101-oblique cylinder structure, 102-outer wall undercut, 103-groove structure; 200-product two, 201-barb structure. DETAILED DESCRIPTION

[0032] See also Figure 1 The present invention provides a multi-undercut molding die for molding a product 100, wherein the product 100 has an inclined cylinder structure 101, an outer wall undercut 102 and a groove structure 103; see Figure 3 , comprising a movable mold and a fixed mold, the movable mold comprising a movable mold base 1, and a movable mold plate 11 is installed on the movable mold base 1;

[0033] See also Figure 4 The movable mold is also provided with a product demoulding mechanism; Figure 5 The demoulding mechanism of the product includes an oblique core puller 2 slidably arranged on the movable mold base 1, and the movable mold base 1 is also provided with an oblique driving member for driving the oblique core puller 2 to slide;

[0034] Preferably, the oblique driving member of the present invention is an oblique pull cylinder 22;

[0035] Optionally, the oblique driving member of the present invention may also be other power devices, such as a pneumatic cylinder or an electric cylinder.

[0036] The oblique core pulling 2 is fixedly provided with an outer wall undercut slider 21 for forming an outer wall undercut 102 of a product 100;

[0037] The sliding direction of the oblique core pull 2 ​​is consistent with the mold opening direction of the undercut 102 of the outer wall of the product 100. Those skilled in the art can adaptively set the angle between the sliding direction of the oblique core pull 2 ​​and the mold opening direction according to the specific product structure.

[0038] See also Figure 6 The oblique core pulling 2 is also fixed with a linkage block 26, and the linkage block 26 has a retreat groove 261; the movable plate 11 is slidably provided with a groove slider 27 for forming the groove structure 103 of the product 100; the groove slider 27 is in sliding cooperation with the retreat groove 261;

[0039] The groove slider 27 is restricted by the movable template 11 and performs linear reciprocating sliding on the movable template 11.

[0040] When the mold is opened, the oblique pull cylinder 22 drives the oblique core pulling 2 to slide, thereby driving the outer wall undercut slider 21 to separate from the outer wall undercut 102 of the product 100; at the same time, the linkage block 26 moves, and the retreat groove 261 generates a driving force for the groove slider 27, causing it to slide along a predetermined trajectory on the movable template 11, thereby separating from the groove structure 103 of the product 100.

[0041] The present invention arranges an outer wall undercut slider 21 and a groove slider 27 on the oblique core pulling 2. When the mold is opened, the outer wall undercut slider 21 and the groove slider 27 act synchronously, so that two undercut structures with different directions on the product 100 are demolded at the same time, simplifying the structure.

[0042] As an embodiment, a guide groove 25 is provided on the oblique core pulling 2, and a support block 12 which slides with the guide groove 25 is fixed on the movable mold base 1; so that the oblique core pulling 2 can slide smoothly along the track defined by the guide groove 25 to ensure the accuracy of reset and mold closing.

[0043] The oblique core pulling 2 is also provided with a core pulling groove 28, and the core pulling groove 28 is slidably connected to the oblique cylinder core pulling 3 used to form the oblique cylinder structure 101; a blind hole is provided inside the oblique cylinder core pulling 3, and a core pulling spring 31 is provided in the blind hole, and the lower end of the core pulling spring 31 abuts against the oblique core pulling 2;

[0044] When the mold is opened, the core pulling spring 31 applies a thrust to the inclined cylinder core pulling 3 as the movable mold separates from the fixed mold, causing it to move along the core pulling slot 28 until it separates from the inclined cylinder structure 101 .

[0045] When the mold is closed, the movable mold and the fixed mold are close to each other, the inclined cylinder core pulling 3 is pressed back along the core pulling slide groove 28, and the core pulling spring 31 is compressed and stores energy.

[0046] Preferably, a limit block 281 is provided in the core-pulling slot 28 to limit the maximum stroke of the inclined cylinder core-pulling 3 .

[0047] As an embodiment, the fixed mold is fixedly connected to a driving block 4, and a driving column 41 is fixedly arranged on the driving block 4; a driving hole for slidingly plugging with the driving column 41 is opened on the inclined cylinder core puller 3;

[0048] When the mold is opened, the movable mold retreats, and the driving column 41 of the driving block 4 generates a driving force on the inclined cylinder core pull 3, causing it to move along the core pull slot 28. During the mold opening process, the driving column 41 moves backward relative to the driving hole until it is disengaged from the driving hole. When the mold is closed, the driving column 41 is inserted into the driving hole again, and with the mold closing action, the inclined cylinder core pull 3 is pressed back.

[0049] As an embodiment, the product 100 of the present invention is two pieces, which are combined into an assembly after molding. The molding die of the present invention molds two products 100 at the same time; two sets of outer wall undercut sliders 21 and oblique cylinder core pullers 3 are symmetrically arranged on the oblique core puller 2; two retreat grooves 261 are symmetrically arranged on the linkage block 26; and two groove sliders 27 are symmetrically arranged on the movable mold plate 11.

[0050] Two sets of symmetrical product demoulding mechanisms are formed through an oblique core pulling 2, which fully utilizes the mold space and improves the output efficiency.

[0051] The present invention realizes demoulding of multiple undercut structures with different directions in a limited space by arranging the outer wall undercut slider 21, the linkage block 26 and the oblique cylinder core pull 3 on the oblique core pull 2. The structure is compact and the molding of complex products is realized.

[0052] See also Figure 7 As an embodiment, the multi-barrel molding die of the present invention is also used to mold product 200, and the side wall of product 200 has a barb structure 201; since the barb structure 201 is close to the bottom of the side wall and the distance from the side wall is small, the existing slanted top structure is difficult to apply due to the lack of retreat space.

[0053] The molding die of the present invention is also provided with a second demoulding mechanism for the product; the second demoulding mechanism for the product includes a slide member 6 fixedly arranged on the fixed die; the slide member 6 is provided with a molding slide 62; the molding slide 62 forms a predetermined angle with the mold opening direction of the mold;

[0054] The molding slide groove 62 is slidably connected to the molding slide block 5; a spring hole is provided on the molding slide block 5, and an ejection spring 51 is provided in the spring hole; two ends of the ejection spring 51 abut against the fixed mold and the molding slide block 5 respectively; the molding slide block 5 is slidably arranged on the movable mold plate 11;

[0055] The molding slide block 5 is also provided with a barb top block 52 for molding the barb structure 201 in a sliding manner; the molding slide block 5 is also provided with a top block spring 54 for pushing the barb top block 52 to slide relative to the molding slide block 5;

[0056] See also Figure 8 When the mold is opened, the movable mold is separated from the fixed mold, and the molding slide 62 of the slide member 6 generates a driving force on the molding slide 5; at the same time, the ejection spring 51 releases elastic energy, pressing the molding slide 5 on the movable mold plate 11, so that the molding slide 5 slides on the movable mold plate 11 under the action of the driving force. The barb top block 52 is always pressed against the second product 200 under the action of the top block spring 54 to avoid damaging its barb structure 201. Until the barb top block 52 is completely separated from the second product 200, the second product 200 is removed, and its barb structure 201 is separated from the barb top block 52.

[0057] The present invention arranges a barb top block 52 on the molding slide block 5 and utilizes the elastic force to delay demoulding of the barb structure 201 of the second product 200 when the mold is opened, thereby avoiding damage thereof.

[0058] As an embodiment, the fixed mold is further fixed with a sleeve rod 53, and the ejection spring 51 is sleeved on the sleeve rod 53; the sleeve rod 53 plays a role in fixing the ejection spring 51;

[0059] Since the volume of the slide member 6 is limited, it is inconvenient to open a threaded hole. Further, the side of the slide member 6 is also connected to a connecting rod 61, and a threaded hole is drilled in the connecting rod 61, which is fixed to the fixed mold by bolts.

[0060] More preferably, one end of the barb top block 52 is fixedly connected to the stop block 55 , and the top block spring 54 is sandwiched between the stop block 55 and the barb top block 52 to prevent the barb top block 52 from detaching from the forming slider 5 .

[0061] As a preferred solution, the front end of the barbed top block 52 is provided with an introduction surface 521, which is convenient for contacting with the movable template 11 to avoid collision between the two.

[0062] Combination Fig. 9 As an embodiment, a hook block 14 is fixed on the movable platen 11; the hook block 14 is slidably arranged at the bottom of the forming slider 5. When the mold is opened, if the ejection spring 51 is over-compressed and cannot provide sufficient elastic force, the hook block 14 generates a pulling force on the forming slider 5 to keep it attached to the movable platen 11 to prevent it from being taken away by the fixed mold.

[0063] Furthermore, a slide plate 13 is fixed on the movable plate 11, and the molding slider 5 is slidably fitted on the slide plate 13; when the mold is opened or closed, the molding slider 5 slides along the slide plate 13 to prevent the movable plate 11 from being worn.

[0064] Furthermore, a thrust block 15 is fixedly provided on the movable platen 11 to limit the sliding limit position of the molding slide block 5 on the movable platen 11 .

[0065] As an embodiment, the molding die molds a plurality of second products 200 at the same time, and the molding die is also provided with the same number of second product demoulding mechanisms as the second products 200.

[0066] In summary, the present invention provides a multi-undercut molding die, which realizes demoulding of multiple undercut structures in different directions in a limited space by arranging an outer wall undercut slider, a linkage block and an oblique cylinder core pulling on the oblique core pulling. The structure is compact and the molding of complex products is realized. The molding die of the present invention is also provided with a demoulding mechanism for product 2; by arranging a barb top block on the molding slider, the effect of elastic force is utilized to delay demoulding of the barb structure of product 2 when the mold is opened to avoid damage.

[0067] Of course, the present invention may have many other embodiments. Without departing from the spirit and essence of the present invention, those skilled in the art may make various corresponding changes and modifications based on the present invention, but these corresponding changes and modifications should all fall within the scope of protection of the claims attached to the present invention.

Claims

1. A multi-undercut molding die, used for molding a product 1, wherein the product 1 has an oblique cylinder structure, an outer wall undercut and a groove structure; characterized in that: It includes a movable mold and a fixed mold, wherein the movable mold includes a movable mold base, and a movable mold plate is installed on the movable mold base; The movable mold is also provided with a product demoulding mechanism; the product demoulding mechanism includes an oblique core puller slidably provided on the movable mold base, and the movable mold base is also provided with an oblique driving member for driving the oblique core puller to slide; The oblique core pulling device is fixedly provided with an outer wall undercut slider for forming an outer wall undercut of the product; the oblique core pulling device is also fixedly provided with a linkage block, and the linkage block has a retreat groove; the movable plate is slidably provided with a groove slider for forming a groove structure of the product; the groove slider is in sliding cooperation with the retreat groove; The oblique core pulling device is also provided with a core pulling groove, and the core pulling groove is slidably connected to form the oblique cylinder core pulling device of the oblique cylinder structure; a blind hole is provided inside the oblique cylinder core pulling device, and a core pulling spring is provided in the blind hole, and the lower end of the core pulling spring abuts against the oblique core pulling device.

2. The multi-undercut forming die according to claim 1, characterized in that: The molding die molds two products at the same time; two sets of outer wall undercut sliders and oblique cylinder core pulling are symmetrically arranged on the oblique core pulling; two retreat grooves are symmetrically opened on the linkage block; and two groove sliders are symmetrically arranged on the movable template.

3. The multi-undercut forming die according to claim 1, characterized in that: The fixed mold is fixedly connected with a driving block, and a driving column is fixedly arranged on the driving block; and a driving hole which is slidably plugged and matched with the driving column is opened on the inclined cylinder core pulling.

4. The multi-undercut forming die according to claim 1, characterized in that: A guide groove is provided on the oblique core pulling device, and a support block which is slidably matched with the guide groove is fixed on the movable mold seat.

5. The multi-undercut forming die according to claim 1, characterized in that: The oblique driving member is an oblique pull cylinder.

6. The multi-undercut forming die according to claim 1, characterized in that: A limiting block is arranged in the core-pulling slide groove.

7. The multi-undercut molding die according to any one of claims 1 to 6, further used for molding a second product, wherein the side wall of the second product has a barb structure; characterized in that: The molding die is also provided with a second demoulding mechanism for the product; the second demoulding mechanism for the product includes a slide member fixedly arranged on the fixed die; the slide member is provided with a molding slide; The forming slide is slidably connected to the forming slide; a spring hole is provided on the forming slide, and an ejection spring is provided in the spring hole; two ends of the ejection spring abut against the fixed mold and the forming slide respectively; the forming slide is slidably arranged on the movable mold plate; A barb top block for forming a barb structure is also slidably provided on the forming slide block; and a top block spring for pushing the barb top block to move relative to the forming slide block is also provided in the forming slide block.

8. The multi-undercut forming die according to claim 7, characterized in that: The fixed die is also fixedly connected with a sleeve rod, and the ejection spring is sleeved on the sleeve rod.

9. The multi-undercut forming die according to claim 7, characterized in that: One end of the barb top block is fixedly connected to the stop block, and the top block spring is clamped between the stop block and the barb top block; and a guide surface is arranged at the front end of the barb top block.

10. The multi-undercut forming die according to claim 7, characterized in that: A slide plate is also fixed on the movable template, and the molding slider is slidably fitted with the slide plate.

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