Inverted mold and inverted demolding method

Abstract

This application provides an inverted mold and an inverted demolding method. The inverted mold includes an upper mold plate, a lower mold plate, two demolding structures, and two ejection structures. The two demolding structures and the two ejection structures are symmetrically arranged between the upper mold plate and the lower mold plate along a first horizontal direction and a second horizontal direction, respectively. When the upper mold plate and the lower mold plate are closed, the upper mold plate, the lower mold plate, the shovel base, and the two demolding structures together form a cavity with an undercut structure. When the upper mold plate and the lower mold plate are opened, the two demolding structures move to undercut and demold the molded part in the cavity, and the two ejection structures move to demold the molded part from the upper mold plate. This inverted mold can release the undercut first during the mold opening process, and then complete the ejection and separation, ensuring smooth demolding of the molded part and meeting the needs of efficient and automated production.

Claims

1. An inverted mold, comprising: First, upload the template; A lower template is located below the upper template, and a shovel base is set inside the lower template; Two demolding structures are symmetrically arranged between the upper and lower mold plates along a first horizontal direction; two ejection structures are symmetrically arranged between the upper and lower mold plates along a second horizontal direction, which is perpendicular to the first horizontal direction; when the upper and lower mold plates are closed, the upper mold plate, the lower mold plate, the shovel base, and the two demolding structures together form a cavity; when the upper and lower mold plates are opened, the two demolding structures move to interlock with a molded part in the cavity for demolding, and the two ejection structures move to demold the molded part from the upper mold plate.

2. The inverted mold as described in claim 1, wherein, The demolding structure includes: a slider, which is slidably disposed on the upper template along the first horizontal direction, and the outer side of the slider is provided with a driving groove; a first driving block, which is fixedly connected to the lower template, and the top of the first driving block extends to the top of the lower template, and the top of the first driving block protrudes a driving part facing the slider; wherein the driving part is slidably disposed in the driving groove along a height direction, and when the driving part moves out of the driving groove, it pushes the slider to move along the first horizontal direction, so that the slider disengages from an undercut structure of a molded part.

3. The inverted mold as described in claim 2, wherein, The slider includes a sliding body and a molding part fixed below the sliding body. The drive groove is provided on the outer side of the sliding body, and a molding block is provided on the outer side of the molding part. The outer end face of the molding block forms the profile of the undercut structure.

4. The inverted mold as described in claim 2 or 3, wherein, The bottom surface of the drive groove is provided as a first transmission slope, and the bottom surface of the drive part is provided as a first drive slope. The drive part drives the slider to move along a first horizontal direction through the cooperation of the first drive slope and the first transmission slope.

5. The inverted mold as described in claim 3, wherein, The slider also includes a limiting plate, fixed above the sliding body and extending outward along the first horizontal direction to the outside of the sliding body. The top surface of the limiting plate includes two limiting grooves arranged side by side along the first horizontal direction. The demolding structure also includes an elastic positioning element, installed on the upper template. The elastic positioning element includes a housing, an elastic element, and a positioning bead. The positioning bead is connected to the housing through the elastic element. During the movement of the slider along the first horizontal direction, the positioning bead moves between the two limiting grooves under the action of the elastic element.

6. The inverted mold as described in claim 5, wherein, The upper template includes two sets of first mounting slots symmetrically arranged along the first horizontal direction, and the lower template includes two sets of second mounting slots symmetrically arranged along the first horizontal direction. The two sets of second mounting slots are respectively connected to the two sets of first mounting slots. The two sliders are respectively slidably disposed in the two sets of first mounting slots, and the two first driving blocks are respectively fixed in the two sets of second mounting slots. The top of the first driving block extends out of the second mounting slot and into the corresponding first mounting slot, so that the driving part is engaged and connected in the driving slot.

7. The inverted mold as described in claim 6, wherein, The first mounting slot group includes a first mounting slot, a second mounting slot, and a third mounting slot. The second and third mounting slots are arranged side by side below the first mounting slot. The second mounting slot connects the first mounting slot and the bottom surface of the upper template. The third mounting slot is located outside the second mounting slot and is laterally connected to it. The second mounting slot group includes a fourth mounting slot connected to the third mounting slot. The limiting plate is installed in the first mounting slot, the sliding body is installed in the second mounting slot, the forming part extends from below the second mounting slot, the first driving block is fixed in the fourth mounting slot, and the top of the first driving block extends from the fourth mounting slot and into the third mounting slot.

8. The inverted mold as described in claim 1, wherein, The ejection structure includes: a fixed block, fixedly connected to the lower template, with the top of the fixed block extending above the lower template; a top block, slidably connected to the upper template along a height direction and located above the cavity, the top block being located inside the fixed block along a second horizontal direction, and the top block having a transmission groove on its outer side facing the fixed block; and a second driving block, slidably connected to the fixed block along the second horizontal direction; wherein the second driving block is slidably disposed in the transmission groove along the height direction, and when the second driving block moves to contact the bottom surface of the transmission groove and continues to move, it drives the top block to move downward along the height direction to push the molded part to demold from the upper template.

9. The inverted mold as described in claim 8, wherein, The ejection structure also includes two third drive blocks, which are fixed on the upper template. The two third drive blocks are symmetrically arranged on both sides of the top block. During the process of the second drive block driving the top block to move downward along the height direction, the third drive block pushes the second drive block to move outward synchronously along the second horizontal direction and disengage from the top block.

10. The inverted mold as described in claim 9, wherein, The ejection structure further includes: two first elastic elements symmetrically connected between the top block and the upper template, wherein the top block moves upward and resets through the force of the two first elastic elements; and a second elastic element connected between the fixed block and the second driving block, wherein the second driving block moves and resets through the force of the second elastic element.

11. The inverted mold as described in claim 10, wherein, The top block includes a top block body, two guide plates and a baffle. The two guide plates are symmetrically arranged on both sides of the top block body along the first horizontal direction. The baffle is fixed above the top block body and the two guide plates. The two ends of the baffle extend outward along the first horizontal direction to the outside of the two guide plates. The top block body has a transmission groove on its outer side facing the fixed block, and the bottom surface of the transmission groove is a transmission plane.

12. The inverted mold as described in claim 11, wherein, The third drive block includes a guide groove with a lateral opening and a second drive ramp, the second drive ramp being disposed on the side of the third drive block facing the fixed block; wherein, the two guide plates are respectively slidably disposed in the two guide grooves, and the second drive ramps of the two third drive blocks are symmetrically disposed on both sides of the bottom surface of the transmission groove.

13. The inverted mold as described in claim 12, wherein, The second driving block includes a driving plane and two second transmission inclined surfaces, which are symmetrically arranged on both sides of the driving plane. The driving plane and the transmission plane cooperate to drive the top block to move downward, and the two second driving inclined surfaces and the two second transmission inclined surfaces cooperate to drive the second driving block to move outward along the second horizontal direction and disengage from the transmission groove.

14. The inverted mold as described in claim 13, wherein, The fixed block includes a movable groove extending along the second horizontal direction. A cover plate is fixed to the side of the movable groove away from the top block. The second drive block is movably disposed in the movable groove. The second elastic element is located in the movable groove and connected between the cover plate and the second drive block.

15. The inverted mold as described in claim 14, wherein, The upper template also includes two sets of first assembly slots symmetrically arranged along the second horizontal direction, and the lower template includes two sets of second assembly slots symmetrically arranged along the second horizontal direction. The two sets of second assembly slots are respectively connected to the two sets of first assembly slots. The two top blocks and the two third drive blocks are respectively disposed in the two sets of first assembly slots, and the two fixing blocks are respectively fixed in the two sets of second assembly slots. The fixing blocks extend from the second assembly slots and extend into the corresponding first assembly slots. The second drive blocks are connected in the transmission slots.

16. The inverted mold as described in claim 15, wherein, The first assembly slot group includes a first assembly slot, a second assembly slot, two third assembly slots, and a fourth assembly slot. The first assembly slot extends along a first horizontal direction. The second assembly slot is perpendicularly connected to the first assembly slot and the bottom surface of the upper template. A guide slot is provided on each side of the second assembly slot along the first horizontal direction. The two third assembly slots are arranged parallel to each other below the first assembly slot and are laterally connected to the second assembly slot. The fourth assembly slot is arranged along a second horizontal direction outside the first assembly slot and is laterally connected to the first assembly slot, the second assembly slot, and the two third assembly slots. The second assembly slot group includes a fifth assembly slot connected to the fourth assembly slot. The baffle is installed in the first assembly slot, the first elastic element is connected between the baffle and the bottom surface of the first assembly slot, the two third drive blocks are respectively fixed in the two third assembly slots, and the two guide slots are respectively connected to the two guide slots, the top block body is installed in the second assembly slot, the two guide plates are respectively connected to the corresponding guide slots, the fixing block is fixed in the fifth assembly slot and the top of the fixing block extends out of the fifth assembly slot and into the fourth assembly slot, and the second drive block extends out of the fourth assembly slot and into the transmission slot.

17. A method for demolding an inverted mold, comprising: In the first mold opening stage, the upper and lower mold plates open, and the two demolding structures move to disengage from the undercut structure of a molded part in the cavity, thus achieving undercut demolding. In the second mold opening stage, the upper and lower mold plates continue to open, and the two ejection structures move to push the molded part away from the upper mold plate, thus completing the overall demolding.

18. The method as described in claim 17, wherein, In the first mold opening stage, an upper mold plate and a lower mold plate open, and the movement of the two demolding structures disengages from an undercut structure of a molded part in a cavity, realizing undercut demolding. This includes: the upper mold plate moving upward a first vertical distance, a shovel base separating from a slider, and the first driving inclined surface of a first driving block contacting the first transmission inclined surface of a driving groove; the upper mold plate continuing to move upward a second vertical distance, the first driving block pushing the slider to move inward a first horizontal distance along a first horizontal direction, and the slider completely disengaging from the undercut structure.

19. The method as described in claim 18, wherein, In the second mold-opening stage, the upper and lower mold plates continue to open, and the two ejector structures move and push the molded part away from the upper mold plate to complete the overall demolding, including: the upper mold plate continues to move upward by a third vertical distance, and a driving plane of a second driving block and a transmission plane of an ejector block come into contact; the upper mold plate continues to move upward by a fourth vertical distance, the second driving block pushes the ejector block downward by the fourth vertical distance, the ejector block pushes the molded part downward by the fourth vertical distance, and a second driving slope of a third driving block comes into contact with a second transmission slope of the second driving block; the upper mold plate continues to move upward by a fifth vertical distance, the second driving block pushes the ejector block downward by the fifth vertical distance, the ejector block pushes the molded part downward by the fifth vertical distance, the third driving block pushes the second driving block to move outward by a second horizontal distance along a second horizontal direction to disengage from the transmission plane, and the ejector block moves upward to reset; the upper mold plate continues to move upward by a sixth vertical distance, the outer surface of the second driving block separates from the outer surface of the ejector block, and the second driving block moves horizontally outward to reset.

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