CN110091479A - A kind of back-off loose-core injection mould - Google Patents

Abstract

The invention discloses an undercut core-pulling injection mold, which relates to the technical field of moulds, and mainly aims to solve the problem that the traditional undercut mold has undercut damage and the product yield is low; the injection mold includes a front membrane component and a rear membrane component. Membrane assembly, the front membrane assembly includes a front mold A plate and a front mold panel, a front mold core and a slider seat are installed in the front mold A plate, and the rear membrane assembly includes a rear mold B plate and a rear mold heat insulation board And the bottom plate of the rear mold, the shovel base matched with the slider seat after mold closing is installed inside the said rear mold B plate, and the inside of the said front mold A plate is provided with a front mold core and an insert pin matched with the cavity surface of the front mold core A. Movable inserts and inserts B, inserts A and inserts B are connected through movable inserts, an oil cylinder is arranged on the outside of the front mold A, and the end of the oil cylinder passes through the slider seat to connect with inserts B, An injection molded product with a through-surface structure is built in the cavity of the rear mold core and the front mold core.

Description

An inverted core-pulling injection mold

technical field

The invention relates to the technical field of moulds, in particular to an undercut core-pulling injection mold.

Background technique

Injection mold is a tool for producing plastic products; it is also a tool for giving plastic products complete structure and precise dimensions. Injection molding is a processing method used in the mass production of certain complex-shaped parts. Specifically, it refers to injecting heated and melted plastic into a mold cavity under high pressure from an injection molding machine, and after cooling and solidifying, a molded product is obtained.

In the design of injection molds, the parts that appear in the product and interfere with the mold opening direction are called undercuts. If there is an undercut in the product result, it cannot be designed by ordinary demoulding methods. Therefore, there will be a corresponding undercut processing system for this type of mold design. At present, the commonly used undercut processing method is the follow-up movement of the fixed mold push plate, and its realization methods include buckle machine realization, spring realization and so on. However, the movement process of these methods will cause different degrees of undercut and detachment damage to the product, resulting in a low pass rate and high cost.

Contents of the invention

The object of the present invention is to provide an undercut core-pulling injection mold to solve the problem of undercut breakage and low yield of products in traditional undercut structure molds.

To achieve the above object, the present invention provides the following technical solutions:

An undercut core-pulling injection mold includes a front film assembly and a rear film assembly, the front film assembly includes a front mold A plate and a front mold panel, a front mold core and a slider seat are installed in the front mold A plate, the The rear membrane assembly includes a rear mold B plate, a rear mold heat insulation plate and a rear mold bottom plate, and the rear mold heat insulation plate and the rear mold bottom plate are fixed by screws. The inside of the rear mold B is equipped with a shovel base that matches the slider seat after mold closing, and the inside of the front mold A is provided with a front mold core and an insert A that matches the cavity surface of the front mold core, and a movable insert and insert pin B, insert pin A and insert pin B are connected through movable inserts, and an oil cylinder is arranged on the outside of the front mold A plate, and the piston rod flat structure of the oil cylinder is connected with insert pin B through a slider seat. The cavity of the rear mold core and the front mold core is equipped with an injection molding product with a through-surface structure, and the distance between the piston rod of the oil cylinder and the connecting surface of the slider seat is 0.5mm.

On the basis of the above technical solutions, the present invention also provides the following optional technical solutions:

In an optional solution: the shovel base in the front membrane assembly and the slider seat of the rear membrane assembly are fitted through inclined surfaces.

In an optional solution: a thimble bottom plate and a thimble panel are installed between the back mold heat insulation board and the back mold B board, and square irons are fixed on both sides of the thimble panel.

In an optional solution: the thimble panel is equipped with a thimble, a support column and a reset rod spring surrounding the support column.

In an optional solution: a guide sleeve and a guide post are also mounted on the rear mold B, a nozzle is mounted on the front mold A, and a positioning ring is fixed at the center of the front mold panel. A front mold heat insulation board is also arranged on the front mold A.

Compared with the prior art, the beneficial effects of the present invention are as follows:

1. The present invention avoids undercutting, and adopts the form of one side slider core pulling and one side integral insert, and the product structure is compact, and the inner insert has very limited activity space, which can only be pulled out by rotation;

2. After the product of the present invention is taken out with the inner insert, it is placed on a specific tooling, and the insert is quickly taken out. Difficulties in opening molds for products with upside-down structures.

Description of drawings

Fig. 1 is a structural schematic diagram of the present invention.

Fig. 2 is a structural schematic diagram of a section in the present invention.

Fig. 3 is a structural schematic diagram of the rear formwork B plate in the present invention.

Fig. 4 is a schematic structural view of the front formwork A in the present invention.

Fig. 5 is a structural schematic diagram of the product and insert A before rotation in the present invention.

Fig. 6 is a structural schematic diagram of the rotated product and insert A in the present invention.

Notes on reference signs: rear mold heat insulation board 1, thimble bottom plate 2, thimble panel 3, rear mold bottom plate 4, square iron 5, reset lever spring 6, thimble 7, rear mold B plate 8, front mold A plate 9, front mold Die plate 10, front mold insulation board 11, positioning ring 12, guide sleeve 13, guide post 14, oil cylinder 15, slider seat 16, shovel base 17, rear mold core 18, front mold core 19, nozzle 20, inlay Needle A21, movable insert 22 and setting pin B23.

Detailed ways

The following embodiments will describe the present invention in detail with reference to the drawings. In the drawings or descriptions, similar or identical parts use the same symbols, and in practical applications, the shape, thickness or height of each component can be enlarged or reduced. The various embodiments listed in the present invention are only used to illustrate the present invention, and are not intended to limit the scope of the present invention. Any obvious modifications or changes made to the present invention do not depart from the spirit and scope of the present invention.

Example 1

Please refer to Figures 1 to 6. In an embodiment of the present invention, an inverted core-pulling injection mold includes a front membrane assembly and a rear membrane assembly. The front membrane assembly includes a front mold A plate 9 and a front mold panel 10. A front mold core 19 and a slider seat 16 are installed in the front mold A plate 9, and the rear membrane assembly includes a rear mold B plate 8, a rear mold heat insulation plate 1 and a rear mold bottom plate 4, and the rear mold heat insulation plate 1 and the rear mold bottom plate 4 are fixed by screws, the inside of the rear mold B plate 8 is equipped with a shovel base 17 matched with the slider seat 16 after the mold is closed, and the inside of the front mold A plate 9 is provided with a front mold core 19 and a The insert needle A21, the movable insert 22 and the insert needle B23 matched with the cavity surface of the front mold core 19, the insert needle A21 and the insert needle B23 are connected through the movable insert 22, and the outer side of the front mold A plate 9 is provided with an oil cylinder 15 , the flat structure of the piston rod of the oil cylinder 15 is connected with the insert needle B23 through the slider seat (16), the cavity of the rear mold core 18 and the front mold core 19 is equipped with an injection molded product with a through-surface structure, and the insert needle A21 is The side wall is inserted into the inner side of the injection molding product, and the distance between the connecting surface of the cylinder piston rod 15 and the slider seat 16 is 0.5mm;

The shovel base 17 in the front membrane assembly and the slider seat 16 of the rear membrane assembly are matched by an inclined surface;

Before closing the mold, assemble the insert A21, the movable insert 22, and the insert B23 on the slider seat as a whole, and then advance the oil cylinder 15 to the maximum limit position, and insert A21 from the cavity of the front mold core 19 There is still a gap of 0.5mm on the surface, because the structure of the product is a through surface, so it must be completely closed, so the mold needs to perform the second action, the mold closing process of the front membrane component and the rear membrane component, the shovel base in the front membrane component 17 Cooperate with the slider seat 16 of the rear membrane assembly through an inclined surface, and after the mold is closed, the slider seat 16 continues to advance by 0.5mm, so that the pins are completely attached to the cavity surface of the front mold core 19; after the mold is opened, the oil cylinder moves backward Action, drive the slider seat 16, the insert B23 and the movable insert 22 to move backward together; in this way, the insert B23 can be core-pulled out of the product first; during the demoulding process: the insert A21 first starts to retreat the front mold panel by 10mm, It is found that there is interference with the inner surface of the product, and it cannot be demolded smoothly. Therefore, it is necessary to rotate the insert A21 to a certain angle, and then use the right side, and use the injection molded product to apply a thrust from the side hole to completely eject the injection molded product.

Example 2

The difference between the embodiment of the present invention and the embodiment 1 is that a thimble bottom plate 2 and a thimble panel 3 are installed between the rear mold heat insulation board 1 and the rear mold B board 8, and square iron is fixed on both sides of the thimble panel 3 5. The thimble panel 3 is equipped with a thimble 7, a support column and a reset rod spring 6 surrounding the support column. The function of the thimble panel 3 is to install the thimble 7. When the mold is opened to eject the product, it provides the ejection movement stroke ;During the ejection process, the return lever spring 6 is compressed, and the thimble 7 is ejected. After the action is completed, the return spring returns, and the thimble retreats; the support column can increase the strength of the overall structure of the mold, and it connects the rear mold bottom plate 4 and the rear mold B Plate 8, two square irons 5 are fixed on the rear mold bottom plate 4, mainly play a supporting role;

Also be equipped with guide sleeve 13 and guide post 14 on the described rear formwork B plate 8, be equipped with pump nozzle 20 on the described front formwork A plate 9, center position place of described front formwork panel 10 is fixed with locating ring 12, in During the process of mold opening and mold closing, the guide post 14 slides in the guide sleeve 13, which can play a role of guiding and precise mold clamping positioning. During the injection molding process, the positioning ring 12 plays the role of positioning the nozzle of the injection molding machine, and the molten plastic passes through The nozzle 20 is injected into the mold cavity, and the front mold A plate 9 is also provided with a front mold heat insulation board 11 .

The above is only a specific implementation of the present disclosure, but the scope of protection of the present disclosure is not limited thereto. Anyone skilled in the art can easily think of changes or substitutions within the technical scope of the present disclosure. should fall within the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be determined by the protection scope of the claims.

Claims (5)

1. a kind of back-off loose-core injection mould, including preceding membrane module and rear membrane module, the preceding membrane module includes preceding mould A plate (9) With preceding die face plate (10), which is characterized in that front cavity (19) and take-up housing (16) are equipped in the preceding mould A plate (9), after described Membrane module includes rear mold B plate (8), rear mold thermal insulation board (1) and rear baffle plate (4), the rear mold thermal insulation board (1) and rear baffle plate (4) it is screwed, the shovel base (17) matched after molding with take-up housing (16), institute is installed inside the rear mold B plate (8) The pin A(21 that mould A plate (9) is internally provided with front cavity (19) and matches with front cavity (19) cavity surface before stating), activity it is embedding Part (22) and pin B(23), pin A2(21) it is connected with pin B(23) by removable insert (22), the preceding mould A plate (9) Outside be provided with oil cylinder (15), the flat bit architecture of oil cylinder (15) piston rod is connect by take-up housing (16) with pin B(23), described Rear cavity (18) and the intracavitary injecting products being equipped in through-plane structure of front cavity (19) type, oil cylinder (15) piston rod and cunning At a distance of 0.5mm between block (16) interface.

2. back-off loose-core injection mould according to claim 1, which is characterized in that the shovel base (17) in the preceding membrane module Cooperated with the take-up housing (16) of rear membrane module by inclined-plane.

3. back-off loose-core injection mould according to claim 1, which is characterized in that the rear mold thermal insulation board (1) and rear mold B Ejector Retainer Plate (2) and thimble panel (3) are installed, the two sides of thimble panel (3) are fixed with square iron (5) between plate (8).

4. back-off loose-core injection mould according to claim 3, which is characterized in that be equipped on the thimble panel (3) Thimble (7), support column and circular release link spring (6) on the support columns.

5. back-off loose-core injection mould according to claim 4, which is characterized in that be also equipped on the rear mold B plate (8) Guide sleeve (13) and guide post (14) are equipped with sprue bushing (20) on the preceding mould A plate (9), the center of the preceding die face plate (10) Place is fixed with positioning ring (12), mould thermal insulation board (11) before being additionally provided on the preceding mould A plate (9).