CN219768974U

CN219768974U - Mould floating structure

Info

Publication number: CN219768974U
Application number: CN202321337859.2U
Authority: CN
Inventors: 明伦; 柳令
Original assignee: Chongqing Guang'ao Automotive Parts Co ltd
Current assignee: Chongqing Guang'ao Automotive Parts Co ltd
Priority date: 2023-05-29
Filing date: 2023-05-29
Publication date: 2023-09-29
Anticipated expiration: 2033-05-29

Abstract

The utility model relates to the field of dies and discloses a die floating structure, which comprises a front die and a rear die, wherein a vertical bar-shaped accommodating hole is formed in the front die, the end part of the accommodating hole is communicated with a die cavity of the front die, a fixed die core is accommodated in the accommodating hole, the end part of the fixed die core is provided with a screw hole, the central axis of the screw hole and a plumb line form an included angle which is a compensation angle, the screw hole can accommodate a screw on a product, the rear die comprises a propping part, the propping part can prop the screw into the screw hole, after the die is opened, the fixed die core can swing in the accommodating hole along the horizontal direction, and the fixed die core can vertically slide relative to the accommodating hole. The utility model can compensate stress of the product in the background technology and is convenient for demoulding.

Description

Mould floating structure

Technical Field

The utility model relates to the field of dies, in particular to a die floating structure.

Background

In the pouring process of the die, the stress generated in the solidification and cooling processes of the material can generate deformation influence, so that compensation stress calculation needs to be performed on the die in advance to ensure that products meeting the requirements can be obtained after the deformation influence is generated, and different types of products have different compensation stress modes.

For certain plastic products, the plastic products can be combined with the screw during injection molding to meet local strength requirements, and the local strength requirements are met through the screw; however, for products with less plastic material on one side, the products can be inclined and deformed towards the side with less material in the shrinkage process, the screws on the products can also be inclined, the screws are not vertical to the surface of the products any more, and the screws cannot be normally installed and used.

If such deformation is to be compensated, the screw needs to be inserted into the mold in advance on the side far away from the material to be less before injection molding, so as to ensure that the screw is still perpendicular to the surface of the product after shrinkage deformation. When demoulding, the product is usually demoulded along the vertical direction, and because the screw is obliquely inserted into the mould, the screw needs to be demoulded along the oblique direction, the stress deformation is easy to generate due to the fact that the whole product is inconsistent with the demoulding direction of the screw, and the product structure is easy to damage. The utility model is therefore directed to a floating structure for a mold that allows stress compensation for the above-mentioned product and facilitates demolding.

Disclosure of Invention

The utility model aims to provide a die floating structure which can compensate stress aiming at products in the background technology and is convenient for demoulding.

In order to achieve the above purpose, the utility model adopts the following technical scheme: the utility model provides a mould floating structure, including front mould and rear mould, be equipped with the accommodation hole of vertical bar on the front mould, the die cavity intercommunication of accommodation hole tip and front mould has the fixed mold core in the accommodation hole, and open at cover half core tip has the screw hole, and the contained angle of screw hole axis and plumb line is the compensation angle, and the screw on the screw hole can hold the product, and the rear mould is including supporting tight portion, supports tight portion and can jack into the screw hole with the screw, and after the die sinking, the fixed mold core can follow horizontal direction swing in the accommodation hole, and the cover half core can also be relative accommodation hole vertical slip. The beneficial effect of this scheme is:

1. the screws are inserted into the screw holes, the die is assembled and then injection molded, and after the plastic and the screws are combined together, the product is arranged on the rear die after die opening. In the process of demolding and taking out the product, initially, when the mold is opened, the fixed mold core floats together with the screw, so that the screw can be consistent with the whole moving direction of the product; and then, the plastic part of the product is separated from the shaping die cavity, the fixed die core is driven by the screw to slide out of the accommodating hole, and the fixed die core is driven by the screw to swing and break loose.

2. After the die is assembled, the abutting part, the screw, the fixed die core and the inner wall of the accommodating hole are sequentially abutted, so that the phenomenon that a product is not compact due to the fact that the screw shakes in disorder in the injection molding process is prevented, and the injection molding quality is further guaranteed; after the die is opened, the abutting part is away from the front die along with the product, and the limit on the displacement of the screw and the fixed die core is removed.

3. The contained angle of screw hole axis and plumb line is the compensation angle, takes place after the product demolding and compensates the shrink, and the screw hole axis is coincident with the plumb line gradually under the effect of shrink stress, and the rotatory angle of screw hole axis is the compensation angle, compensates the shrink back, and the straightness that hangs down of screw hole is in error allowance scope, satisfies the normal use of product can.

Preferably, as a modification, the receiving hole and the stationary mold core are rectangular in cross section. So set up, during the drawing of patterns, compare in circular cross-section, rectangular cross-section is with screw drive decide mold core wobbling direction limit into two direction round trip oscillations to make wobbling power concentrate in two directions, and then make the screw break loose more easily decides the mold core, in order to accomplish the drawing of patterns.

Preferably, as an improvement, the accommodating hole comprises a movable hole and a limiting hole, one end communicated with the die cavity is the end part of the limiting hole, a pin shaft is horizontally arranged at one end, far away from the die cavity, of the fixed die core, the pin shaft can move along with the fixed die core in the movable hole, and the pin shaft cannot enter the limiting hole. The fixed die core is limited through the pin shaft, the fixed die core is prevented from being pulled out of the accommodating hole along with the screw, and the trouble that the fixed die core is manually put back into the accommodating hole when the die is closed next time is avoided.

Preferably, as an improvement, one end of the limiting hole, which is close to the die cavity, is a flaring in a horn shape, one end of the fixed die core, which is close to the die cavity, is a conical part, the conical part is matched with the flaring in shape, and the screw hole is arranged on the conical part. When the mold is assembled, the conical part and the flaring are tightly abutted through the abutting part, so that products are prevented from leaking into the accommodating hole in the injection molding process, and the molding quality is reduced.

Drawings

FIG. 1 is a three-dimensional isometric view of a product of an embodiment;

FIG. 2 is a front mold and product bottom view of an embodiment;

FIG. 3 is a cross-sectional view taken along line A-A of FIG. 2;

fig. 4 is a schematic diagram illustrating the structure of fig. 3 in a split manner.

Detailed Description

The following is a further detailed description of the embodiments:

reference numerals in the drawings of the specification include: the mold comprises a mold blank 110, a movable hole 111, a mold core 120, a limiting hole 121, a fixed mold core 130, a flaring 131, a pin hole 132, a screw hole 133, a conical part 221, a product 200, a plastic part 210 and a screw 220.

Examples

The embodiment is substantially as shown in fig. 2 and 3: the die floating structure comprises a front die and a rear die cavity, wherein the front die is a fixed die, the front die is arranged above the rear die, and a space formed between the front die and the rear die is the die cavity. The product of this embodiment production is as shown in fig. 1, and the product includes screw and plastics portion, and the screw fixation is at plastics portion right-hand member, and plastics portion upside concave part is more, and consequently the plastics of upside is less, and plastics portion is after the shrink deformation, and plastics portion upside draws in, and then can drive the screw of plastics portion right-hand member left side slope, consequently makes the screw incline to the right in advance through this embodiment, offsets the left slope that shrink deformation brought to make plastics portion shrink deformation after, the screw just is vertical state, in order to satisfy the service function of product.

As shown in figure 2, the front mold comprises a fixed mold core, a mold blank and a mold core embedded in the middle of the mold blank, the mold blank and the mold core are in screw connection and are cuboid, the mold core is directly contacted with a product in the injection molding process, the molding quality of the product is directly affected, a section line of the mold core is omitted in figure 3, as shown in figures 3 and 4, a movable hole is formed in the mold blank, the movable hole penetrates through the lower side of the mold blank, a limit hole is formed in the mold core, the limit hole vertically penetrates through the mold core, namely, the limit hole is communicated with a mold cavity below the mold core, the movable hole and the limit hole are both rectangular in section, the movable hole and the limit hole are vertically aligned to form a containing hole, the fixed mold core is a strip-shaped rectangular piece, the fixed mold core is contained in the containing hole, a gap is reserved between the movable hole and the limit hole and the fixed mold core, so that the fixed mold core can swing in the containing hole along the horizontal direction, and the fixed mold core can also vertically slide relative to the containing hole; the upper end of the fixed mold core is provided with a pin hole, a pin shaft (not shown in the figure) is penetrated in the pin control, the length of the pin shaft is smaller than the side length of the section of the movable hole and is larger than the side length of the section of the limit hole, the pin shaft can move along with the fixed mold core in the movable hole, and the pin shaft cannot enter the limit hole; as shown in FIG. 4, the lower end of the limiting hole is a flaring in a horn shape, the lower end of the fixed die core is a conical part, the conical part is matched with the flaring in shape, a screw hole is formed in the lower side of the conical part, the included angle between the central axis of the screw hole and the plumb line is a compensation angle theta, the compensation angle theta is 2 DEG in the embodiment, after the product is subjected to compensation shrinkage after demolding, the central axis of the screw hole is gradually overlapped with the plumb line under the action of shrinkage stress, and the rotation angle of the central axis of the screw hole is the compensation angle theta.

The rear mold comprises a propping part, the propping part can jack the screw into the screw hole, the propping part is not shown in fig. 3, and the propping action of the propping part on the screw is indicated by an arrow.

The specific implementation steps are as follows:

1. and (3) enabling the fixed die core to pass through a limit hole of the die core, enabling one end of the fixed die core with a pin shaft to face upwards, embedding the die core into a die blank, and fixing the die core with a screw to form a front die.

2. The screw is placed in the screw hole 133 of the front mold, the rear mold is moved upward, the screw is pushed into the screw hole of the fixed mold core by the abutting portion, and the screw is abutted.

3. After the front mould and the rear mould are clamped, the plastic part of the product is injection molded, and after the plastic part and the screw are combined together, the product after mould opening is moved subsequently. In the process of demolding and taking out the product, initially, the fixed mold core floats together with the screw, so that the screw can be consistent with the moving direction of the plastic part; then, the plastic part of the product is demolded, the screw drives the fixed die core to slide out of the accommodating hole, the screw drives the fixed die core to swing and break loose from the fixed die core, and the demolding process is ejected by adopting an ejection device in the prior art, so that the description is omitted.

The foregoing is merely exemplary of the present utility model, and specific technical solutions and/or features that are well known in the art have not been described in detail herein. It should be noted that, for those skilled in the art, several variations and modifications can be made without departing from the technical solution of the present utility model, and these should also be regarded as the protection scope of the present utility model, which does not affect the effect of the implementation of the present utility model and the practical applicability of the patent. The protection scope of the present utility model is subject to the content of the claims, and the description of the specific embodiments and the like in the specification can be used for explaining the content of the claims.

Claims

1. Mould floating structure, its characterized in that: including front mould and rear mould, be equipped with the accommodation hole of vertical bar on the front mould, the die cavity intercommunication of accommodation hole tip and front mould has accommodated the fixed mould core in the accommodation hole, and open at fixed mould core tip has the screw hole, and the contained angle of screw hole axis and plumb line is the compensation angle, and the screw on the screw hole can hold the product, and the rear mould is including supporting tight portion, supports tight portion and can jack into the screw hole with the screw in, and after the die sinking, the fixed mould core can follow horizontal direction swing in the accommodation hole, and the fixed mould core can also be relative accommodation hole vertical slip.

2. The mold floating structure according to claim 1, wherein: the holding hole and the fixed die core are rectangular in section.

3. The mold floating structure according to claim 2, wherein: the holding hole comprises a movable hole and a limiting hole, one end communicated with the die cavity is the end part of the limiting hole, a pin shaft is horizontally arranged at one end of the fixed die core, which is far away from the die cavity, and can move along with the fixed die core in the movable hole, and the pin shaft cannot enter the limiting hole.

4. A mold floating structure according to claim 3, wherein: one end of the limiting hole, which is close to the die cavity, is a flaring in a horn shape, one end of the fixed die core, which is close to the die cavity, is a conical part, the conical part is matched with the flaring in shape, and the screw hole is arranged on the conical part.