A type of undercut demolding and hole-removing mold for automotive products

Abstract

This utility model relates to the field of automotive injection molds, and discloses a mold for demolding and removing holes for automotive products undercuts. It includes a pad, a moving mold, and an inclined ejector module slidably mounted on the pad and cooperating with the moving mold. The inclined ejector module includes an inclined ejector, and a side core-pulling slider for forming holes is elastically and telescopically mounted inside the inclined ejector. The telescopic direction of the side core-pulling slider forms an angle with the ejection direction of the inclined ejector. A driving inclined surface is provided on the moving mold, and this driving inclined surface abuts against the end of the side core-pulling slider away from the product hole. When the inclined ejector ejects, the driving inclined surface drives the side core-pulling slider to gradually separate from the product hole. This separation action is synchronized with the action of the inclined ejector detaching from the undercut of the product. The side core-pulling slider does not interfere with the inner wall of the product hole, the inclined ejector, or the product surface. This mold can shorten the single demolding cycle, reduce mold complexity, lower the precision requirements and costs for component fit, and extend the mold's service life.

Description

Technical Field

[0001] This utility model relates to the field of automotive injection molds, and in particular to an undercut demolding and hole-removing mold for automotive products. Background Technology

[0002] In the production of automotive interior parts molds, with the increasing trend of product integration, it often happens that the core-pulling direction of the hole is inconsistent with the core-pulling direction of the inclined ejector during core pulling. To address this issue, some solutions employ an additional wedge structure, such as the inclined ejector inner spring block structure for large and medium-sized automotive molds disclosed in Chinese Patent No. CN206825845U. This structure includes a wedge fixed to the fixed mold, which engages with a slot on the moving mold core and simultaneously fits against the rear side of the inclined ejector. A spring block for core pulling is located inside the inclined ejector. Relying on the engagement between the inclined surface of the wedge and the spring block, during mold opening, as the wedge moves away from the moving mold, the inclined surface of the wedge slowly resets the spring block and slowly pulls the core during the extraction process, achieving hole removal. Subsequently, with the movement of the inclined ejector, it detaches from the product.

[0003] However, the wedge and the moving mold are in a dynamic fit relationship, which requires extremely high fitting accuracy. During long-term use, wear is likely to occur between the two, which directly affects the fitting accuracy between the wedge and the inclined ejector, thereby reducing the product accuracy. At the same time, the additional wedge, matching slots and wear-resistant blocks make the mold structure more complex, and the manufacturing and maintenance costs also increase significantly. Utility Model Content

[0004] This invention addresses the shortcomings of existing side-pulling sliders, which require the addition of wedges when there is an angle between the extension and retraction direction and the ejection direction of the inclined ejector, resulting in high precision requirements, high complexity, and high cost. It provides a new type of undercut demolding and hole-removing mold for automotive products.

[0005] To solve the above-mentioned technical problems, the present invention provides a solution through the following technical method: A mold for demolding and removing holes in automotive products includes a pad, a moving mold, and an inclined ejector module slidably disposed on the pad and cooperating with the moving mold. The inclined ejector module includes an inclined ejector, and a side core-pulling slider for forming holes is elastically and telescopically disposed inside the inclined ejector. The telescopic direction of the side core-pulling slider forms an angle with the ejection direction of the inclined ejector. A driving inclined surface is disposed on the moving mold. The driving inclined surface abuts against the end of the side core-pulling slider away from the hole in the product. When the inclined ejector is ejected, the driving inclined surface drives the side core-pulling slider to gradually separate from the hole in the product. The separation action is synchronized with the action of the inclined ejector disengaging from the undercut of the product. The side core-pulling slider does not interfere with the inner wall of the hole in the product, the inclined ejector, or the surface of the product.

[0006] Compared to the existing technology that requires both hole removal and buckling, this design can simultaneously complete the hole removal and buckling steps. By cooperating with the driving inclined surface and the side core-pulling slider, the action of the side core-pulling slider disengaging from the product cavity and the action of the inclined ejector disengaging from the product buckle are performed simultaneously, significantly shortening the single demolding cycle and improving production efficiency. There is no need to set wedges and slots; the side core-pulling slider can be driven solely by the driving inclined surface on the moving mold, reducing the complexity of the mold, lowering the requirements for the precision of component fit, avoiding the problem of precision degradation caused by long-term wear between the wedge and the moving mold, and extending the service life of the mold.

[0007] Preferably, the side core-pulling slider is elastically assembled in a mounting base, which is detachably fixed to the inclined top by bolts. The inclined top is provided with a clearance hole for the forming end of the side core-pulling slider to pass through.

[0008] With the above solution, the mounting base and the angled ejector are detachably connected. When the side core-pulling slider is worn or malfunctions and needs to be replaced or maintained, there is no need to disassemble the angled ejector; only the mounting base needs to be disassembled. This simplifies the maintenance process, reduces downtime for maintenance, and lowers mold maintenance costs.

[0009] Preferably, the mounting base is provided with an elastic element for enabling the side core-pulling slider to move along the side away from its molding end under normal conditions.

[0010] Using the above solution, the elastic distance is used to achieve automatic reset of the side core-pulling slider, buffer the side core-pulling slider, and reduce its rigid collision with the mounting base and the inclined top.

[0011] Preferably, the elastic element includes a first spring sleeved on the side core-pulling slider, and a limiting protrusion ring protruding on the side core-pulling slider to restrict its disengagement from the mounting seat at one end away from the inclined top. The two ends of the first spring elastically abut against the limiting protrusion ring and the outer wall of the inclined top, respectively.

[0012] By adopting the above scheme, the setting of the limiting protrusion ring can effectively restrict the side core-pulling slider from dislodging from the mounting seat at the end away from the inclined top, ensuring the safe and stable operation of the mold. The first spring provides a stable and directional reset force for the side core-pulling slider through elastic contact with the limiting protrusion ring and the outer wall of the inclined top.

[0013] Preferably, a second spring is fitted on the side core-pulling slider to slow down the ejection speed of the side core-pulling slider along the driving inclined plane. The second spring elastically abuts against the limiting protrusion ring and the inner wall of the end of the mounting seat away from the inclined top.

[0014] Using the above solution, the second spring is used to slow down the pop-out speed of the side core-pulling slider to avoid product damage; the second spring works in conjunction with the first spring to subject the side core-pulling slider to bidirectional elastic force during movement, thereby improving the stability of the side core-pulling slider's movement along the driving inclined plane.

[0015] Preferably, the inclined top is fixed to the upper end of the inclined top rod, the lower end of the inclined top rod is connected to a slider, and a slide rail seat is fixed on the pad. The slide rail is inclined upward and has a groove for guiding the slider to slide.

[0016] Using the above solution, the slide rail seat is used to precisely guide the movement of the inclined top, ensuring the accuracy of the buckle disengagement.

[0017] Preferably, the lifting of the inclined plane is controlled by a drive cylinder, the cylinder body of which is fixed on the moving mold and the end of the piston rod is fixed on the pad.

[0018] This utility model, by adopting the above technical solutions, has significant technical effects: it can simultaneously complete the steps of hole removal and buckling; through the cooperation of the driving inclined surface and the side core-pulling slider, the action of the side core-pulling slider disengaging from the product cavity and the action of the inclined ejector disengaging from the product buckle are carried out simultaneously, greatly shortening the single demolding cycle and improving production efficiency; there is no need to set wedges and slots, the driving of the side core-pulling slider can be realized by the driving inclined surface on the moving mold alone, reducing the complexity of the mold, reducing the requirements for the precision of component fit, avoiding the problem of precision reduction caused by long-term wear of wedges and moving mold, and extending the service life of the mold. Attached Figure Description

[0019] Figure 1 This is a front view of an undercut demolding and hole-removing mold for an automotive product according to this embodiment; Figure 2 yes Figure 1 A sectional view of AA; Figure 3 yes Figure 1 A cross-sectional view of BB; Figure 4 This is the isometric view of the sloping top module in this embodiment. Figure 1 ; Figure 5 This is the isometric view of the sloping top module in this embodiment. Figure 2 .

[0020] The parts referred to by the numbers in the above attached figures are as follows: 1. Pad block; 2. Moving mold; 201. Driving inclined surface; 3. Driving cylinder; 4. Inclined ejector; 5. Mounting base; 501. Mounting block; 6. Measuring core-pulling slider; 7. Limiting protrusion ring; 8. First elastic element; 9. Second elastic element; 10. Inclined ejector rod; 11. Mating block; 12. Slider; 13. Slide rail seat; 14. Slide groove; 15. Bolt. Detailed Implementation

[0021] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0022] A mold for undercutting and demolding of automotive products, referring to Figures 1-5 As shown, it includes a moving mold 2, a pad block 1, and a drive cylinder 3 installed between the moving mold 2 and the pad block 1 to drive the pad block 1 to move closer to or away from the moving mold 2. The cylinder body of the drive cylinder 3 is fixed on the outer wall of the moving mold 2, and the end of its piston rod is fixed on the outer wall of the pad block 1.

[0023] An inclined ejector module is provided between the moving mold 2 and the pad block 1, including an inclined ejector 4 and several inclined ejector rods 10. The inclined ejector 4 is located on the moving mold 2. One end of the inclined ejector rod 10 is fixedly connected to the bottom of the inclined ejector 4. The other end of the inclined ejector rod 10 is fixed to a mating block 11 by a pin. A slider 12 is coaxially hinged to each side of the mating block 11. A slide rail seat 13 corresponding to the inclined ejector rod 10 is fixedly assembled on the pad block 1. The slide rail seat 13 is provided with a clearance groove. The two side walls of the clearance groove are symmetrically inclined with a slide groove 14 for a slider 12 to be guided and inserted.

[0024] A side core-pulling slider 6 for forming a hole is elastically and telescopically installed inside the inclined ejector 4. The telescopic direction of the side core-pulling slider 6 forms an angle with the ejection direction of the inclined ejector 4. A driving inclined surface 201 is provided on the moving mold 2. The driving inclined surface 201 abuts against the end of the side core-pulling slider 6 away from the product hole. When the inclined ejector 4 ejects, the driving inclined surface 201 drives the side core-pulling slider 6 to gradually separate from the product hole. This separation action is synchronized with the action of the inclined ejector 4 disengaging from the product undercut. The side core-pulling slider 6 does not interfere with the inner wall of the product hole, the inclined ejector 4, or the product surface.

[0025] The side core-pulling slider 6 is elastically assembled in a mounting base 5. The inclined top 4 is provided with a relief groove for the mounting base 5 to be embedded and a relief hole for the forming end of the side core-pulling slider 6 to pass through. The mounting base 5 is symmetrically provided with mounting blocks 501 on both sides. The mounting blocks 501 are provided with mounting holes. The inclined top 4 is provided with threaded holes. The bolt 15 passes through the mounting holes and is tightly fitted with the threaded holes.

[0026] An elastic element is provided inside the mounting base 5 to enable the side core-pulling slider 6 to move along the side away from its forming end under normal conditions. The elastic element includes a first spring sleeved on the side core-pulling slider 6. A limiting protrusion 7 is provided on the side core-pulling slider 6 to restrict its exit from the mounting base 5 at the end away from the inclined top 4. The two ends of the first spring elastically abut against the limiting protrusion 7 and the outer wall of the inclined top 4, respectively. A second spring is sleeved on the side core-pulling slider 6 to reduce the ejection speed of the side core-pulling slider 6 along the direction of the driving inclined surface 201. The second spring elastically abuts against the limiting protrusion 7 and the inner wall of the end of the mounting base 5 away from the inclined top 4, respectively. The elastic force of the first spring is greater than that of the second spring.

[0027] The operation process of the undercut demolding and hole-removing mold for automotive products: I. Initial state (after mold closing and forming) After the mold completes the injection molding of the automotive product, all components are in the initial mold-closed position: The piston rod of the driving cylinder 3 is in the extended state, and the pad block 1 is kept at a distance from the moving mold 2; the inclined top 4 of the inclined top module fits against the inner wall of the product, and the forming end of the side core-pulling slider 6 inside it passes through the clearance hole of the inclined top 4 and is embedded into the preset hole position of the product to complete the hole structure forming; the end of the side core-pulling slider 6 away from the product is in close contact with the driving inclined surface 201 on the moving mold 2; the first spring is in the compressed state, and the second spring is in the natural or slightly compressed state.

[0028] II. Mold Opening Operation (Synchronous Hole Release and Clip Disengagement) After the mold opens, drive cylinder 3 retracts to simultaneously release the latch and disengage the hole. The piston rod of the drive cylinder 3 retracts, the pad block 1 approaches the moving mold 2, and the inclined ejector 4 is lifted upwards to disengage. As the inclined ejector 4 is lifted, the side core-pulling slider 6 gradually extends along the drive inclined surface 201 towards the drive inclined surface 201, and at the same time gradually disengages from the product hole to achieve hole removal. III. Reset Stage (Preparing for the Next Mold Closure) The piston rod of the drive cylinder 3 extends again, pushing the pad 1 to move away from the moving mold 2 until the pad 1 returns to its initial state. At the same time, the inclined top module and the side core-pulling slider 6 return to their initial state.

[0029] The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.

Claims

1. A mold for undercutting and hole removal of automotive products, comprising a pad (1), a moving mold (2), and an inclined ejector assembly slidably disposed on the pad (1) and cooperating with the moving mold (2), the inclined ejector assembly comprising an inclined ejector (4), wherein an elastically telescopically disposed side core-pulling slider (6) for hole forming is provided inside the inclined ejector (4), the telescopic direction of the side core-pulling slider (6) forming an angle with the ejection direction of the inclined ejector (4), characterized in that: A driving inclined surface (201) is provided on the moving mold (2). The driving inclined surface (201) abuts against the end of the side core-pulling slider (6) away from the product hole. When the inclined ejector (4) is ejected, the driving inclined surface (201) drives the side core-pulling slider (6) to gradually separate from the product hole. The separation action is synchronized with the action of the inclined ejector (4) disengaging from the product undercut. The side core-pulling slider (6) does not interfere with the inner wall of the product hole, the inclined ejector (4), or the product surface.

2. The automotive product undercut demolding and hole-removing mold according to claim 1, characterized in that: The side core-pulling slider (6) is elastically assembled in a mounting base (5). The mounting base (5) is detachably fixed to the inclined top (4) by bolts (15). The inclined top (4) is provided with a clearance hole for the forming end of the side core-pulling slider (6) to pass through.

3. The automotive product undercut demolding and hole-removing mold according to claim 2, characterized in that: An elastic element is provided in the mounting base (5) to enable the side core-pulling slider (6) to move along the side away from its molding end under normal conditions.

4. The automotive product undercut demolding and hole-removing mold according to claim 3, characterized in that: The elastic element includes a first spring sleeved on the side core-pulling slider (6), and a limiting protrusion (7) protruding on the side core-pulling slider (6) to restrict one end of it from disengaging from the mounting base (5) away from the inclined top (4). The two ends of the first spring elastically abut against the limiting protrusion (7) and the outer wall of the inclined top (4), respectively.

5. The automotive product undercut demolding and hole-removing mold according to claim 4, characterized in that: A second spring is fitted on the side core-pulling slider (6) to slow down the ejection speed of the side core-pulling slider (6) along the direction of the driving inclined surface (201). The second spring elastically abuts against the inner wall of the limiting protrusion ring (7) and the end of the mounting base (5) away from the inclined top (4).

6. The automotive product undercut demolding and hole-removing mold according to claim 1, characterized in that: The inclined top (4) is fixed to the upper end of the inclined top rod (10), and the lower end of the inclined top rod (10) is connected to a slider (12). A slide rail seat (13) is fixed on the pad (1). The slide rail is inclined upward and has a groove (14) for guiding the slider (12) to slide.

7. The automotive product undercut demolding and hole-removing mold according to claim 1, characterized in that: The lifting of the inclined top (4) is controlled by the driving cylinder (3), the cylinder body of the driving cylinder (3) is fixed on the moving mold (2) and the end of the piston rod is fixed on the pad (1).

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