A predeformation mold structure

Abstract

The utility model relates to the field of injection moulding discloses a kind of pre-deformation mould structure, comprising: front die, front die insert, rear die, ejector pin and rear die insert, front die middle part is equipped with cavity, and several front model cores are equipped with in cavity inside annular array, first forming groove is equipped with between adjacent two front model cores, front die insert one end is set in cavity middle part, and front die insert other end is set in first forming groove inside and is equipped with recess structure, rear die middle part is equipped with core, and core annular array is equipped with second forming groove and exhaust structure, second forming groove inside sequentially opens ejector pin and jack in the direction of direction away from core centre line, and ejector pin is set in ejector pin inside, and rear die insert one end is correspondingly set in jack inside, and rear die insert side away from second forming groove one end is equipped with sliding slot, and ejector pin and sliding slot slidingly cooperate.The pre-deformation mould structure of the application is stable in production deformation degree, high yield, and product machine time is short.

Claims

1. A pre-deformation mold structure, characterized by: include: A front mold core, wherein a cavity is provided in the middle of the front mold core, and a plurality of front mold cores are arranged in a circular array inside the cavity, and a first molding groove is provided between two adjacent front mold cores; A front mold insert, one end of which is disposed in the middle of the cavity, and the other end of which is disposed inside the first molding groove and has a groove structure. The rear mold core has a core in the middle, and the core is arranged in a ring array with a number of second forming grooves and a number of venting structures, with the second forming grooves and venting structures arranged alternately. A plurality of ejector pins are provided. Inside the second forming groove, ejector holes and insertion holes are sequentially provided along the direction away from the core center line. The insertion holes and ejector holes are spaced apart on the inner wall of the second forming groove. The ends of the insertion holes and ejector holes away from the second forming groove are connected to each other. The ejector pins are slidably disposed inside the ejector holes one by one. A rear mold insert, one end of which is correspondingly disposed inside the insertion hole, and a sliding groove is provided on the side of the rear mold insert away from the second forming groove, and the ejector pin slides in conjunction with the sliding groove; When the mold is closed, the second forming groove is connected to the first forming groove in a one-to-one correspondence, and one end of the rear mold insert is set inside the groove structure.

2. The preform die structure of claim 1, wherein: The diameter of the end of the second molding groove with the rear mold insert away from the rear mold insert is W1, and the diameter of the end of the second molding groove with the rear mold insert close to the rear mold insert is W2. W1 and W2 satisfy the following relationship: W1 < W2.

3. The preform die structure of claim 1, wherein: The groove structure includes a first groove and a second groove, with the second groove formed at the bottom of the first groove; during mold closing, one end of the rear mold insert is disposed inside the first groove.

4. The preform die structure of claim 3, wherein: A skeleton forming gap is provided between the front mold insert and the inner wall of the first forming groove, and the second groove is connected to the skeleton forming gap.

5. The preform die structure of claim 1 wherein: The cavity is provided with a front mold forming structure in the middle, and the core is provided with a number of rear mold forming structures evenly spaced around the core center line; when the mold is closed, the rear mold forming structures are arranged around the front mold forming structures.

6. The preform die structure of claim 1 wherein: Each of the aforementioned exhaust structures includes a first exhaust groove, several second exhaust grooves, and several third exhaust grooves. The first exhaust grooves are connected end to end. The two ends of the second exhaust grooves are respectively connected to the first exhaust groove and the side of the core. The two ends of the third exhaust grooves are respectively connected to the first exhaust groove and the second forming groove.

7. The preform die structure of claim 5, wherein: The core has an annular groove in the middle, the rear mold forming structure is located inside the annular groove, one end of the second forming groove is connected to the annular groove, and the other end of the second forming groove is connected to the side of the core.

8. The preform die structure of claim 5, wherein: Each of the rear mold forming structures includes several rear mold forming blocks, and a rib forming gap is provided between two adjacent rear mold forming blocks.

9. The preform die structure of claim 5, wherein: The front mold forming structure includes a front mold forming block, and the number of rear mold forming structures is two; when the mold is closed, the front mold forming block is disposed between the two rear mold forming structures.

10. The preform die structure of claim 1 wherein: The pre-deformation mold structure also includes a central insert. A central hole is provided at the center of the core, and the central insert is disposed inside the central hole. The diameter of the central insert decreases in a stepwise manner along the direction close to the front mold core.

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