A large outer cover injection mold facilitating core replacement

Abstract

The utility model relates to the field of injection moulding, and the utility model discloses a big outer cover injection mould of core convenient to replace, include: movable die benevolence, fixed die benevolence, fixed die insert piece and core, fixed die benevolence is set up with a plurality of through -hole, and fixed die insert piece sets up at the one end of through -hole away from movable die benevolence, and every core is by base and core main part fixed connection and is constituted, and core main part penetrates movable die benevolence, and both ends of core main part are all equipped with the locating insert piece that is provided with, and locating insert piece includes insert piece main body and locating structure, and locating structure is fixed in insert piece main body middle part, and locating structure is clamped between movable die benevolence and base, and every fixed die insert piece middle part is equipped with glue injection part. The relative position of locating insert piece and core is positioned through locating structure and base cooperation, and the minimum distance of movable die benevolence and core one end is limited through locating structure, avoids the microshift of core being impacted by material and then retracting into movable die plate inside, improves the positioning accuracy of movable die benevolence and core, and improves finished product pass rate.

Description

Technical Field

[0001] This utility model relates to the field of injection molding, and in particular to a large outer cover injection mold that facilitates core replacement. Background Technology

[0002] Injection molded products are industrial products that can be mass-produced, and injection molds are the most important part of the injection molding process, widely used in the production of plastic parts. Typically, the mold core and moving mold platen are integrally molded into a single unit, meaning one set of moving mold platen structures corresponds to one product. When changing to process other products of the same size and type, these products only differ slightly in their patterns. Changing to process other products of the same size and type usually requires replacing the core and mold base together, a complex process that wastes manpower and incurs high costs for the entire mold, significantly increasing the company's overall costs.

[0003] like Figure 6 and Figure 7 The outer cover product shown has a large size and thin wall thickness, resulting in a complex, uneven surface. For molds with removable cores, the core is susceptible to micro-displacement during injection molding due to the impact of molten material, causing it to retract into the moving mold platen. This change in the relative position of the core and the moving mold platen leads to defective products. Utility Model Content

[0004] The purpose of this invention is to provide a large outer cover injection mold that facilitates core replacement, thereby solving the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model adopts the following technical solution: a large outer cover injection mold that facilitates core replacement, comprising: The moving mold core is embedded in the moving template. A fixed mold core, wherein a plurality of through holes are evenly spaced along the length direction; A fixed mold insert is provided, which corresponds one-to-one with the through hole. The fixed mold insert is located inside the through hole at the end away from the moving mold core. A cavity is formed between the surface of the fixed mold insert near the moving mold core and the inner wall of the through hole. The core and the cavity are arranged opposite to each other. Each core is composed of a base and a core body fixedly connected. The base abuts against the moving template. One end of the core body is located at the center of the upper surface of the base. The other end of the core body passes through the moving mold core. Positioning inserts are provided through both ends of the core body. The positioning insert includes an insert body and a positioning structure. The positioning structure is fixed in the middle of the insert body and is sandwiched between the moving mold core and the base. Each of the fixed mold inserts is provided with a glue injection component in the middle. The glue injection component is provided with a vertical straight channel. The two ends of the vertical straight channel are respectively connected to the main channel of the fixed mold plate and the center of the cavity.

[0006] Preferably, the insert body is a T-shaped oblique prism with both ends penetrating the base and the core body, and the center line of the insert body intersects the center line of the core body at an angle.

[0007] Preferably, the positioning structure includes a protrusion with an inverted L-shaped cross-section. The protrusion is fixed to the middle of the side of the positioning insert away from the core, and the two ends of the protrusion are in contact with the lower surface of the moving mold core and the upper surface of the base, respectively.

[0008] Preferably, the core body has a circular groove at the center of the surface near the fixed mold insert, and the bottom of the circular groove is a spherical crown-shaped curved surface.

[0009] Preferably, the glue injection component includes a frustum, the vertical straight channel is disposed in the middle of the frustum, the end face of the frustum near the core is a spherical crown-shaped curved surface, and one end of the vertical straight channel is connected to the center position of the end face of the frustum near the core.

[0010] Preferably, the diameter a of the end face of the frustum near the core and the diameter b of the bottom of the circular groove satisfy the following relationship: a < b.

[0011] Preferably, the size of the cross-section of the cavity decreases gradually along the direction away from the center line of the fixed mold core.

[0012] Preferably, the cross-section of the core decreases in stages along the direction away from the center line of the rear mold core.

[0013] Preferably, the cross-sectional size of the fixed mold insert decreases in a stepwise manner towards the core, the cross-sectional size of the through hole decreases in a stepwise manner towards the core, and the end of the fixed mold insert near the core is clearance-fitted with the through hole.

[0014] Preferably, the cross-sectional size of the core body gradually decreases along the direction close to the fixed mold insert, the moving mold core has a tapered hole, and the side of the core body near the fixed mold insert has an inclined surface, the inclination of the inclined surface being equal to the inclination of the inner wall of the tapered hole.

[0015] The beneficial effects of this utility model are as follows: during the injection molding process, the positioning insert and the core together form the inner wall of the product, and the fixed mold insert forms the outer wall of the product. The positioning structure positions the moving mold core and the positioning insert, and the positioning structure also positions the core and the positioning insert.

[0016] The core is fixed to the moving mold plate by the moving mold core and the positioning structure, and the core can be replaced simply by removing the moving mold core. The positioning structure and the base work together to position the positioning insert and the core in relative positions, reducing assembly difficulty.

[0017] By limiting the minimum distance between the moving mold core and one end of the mold core through the positioning structure, the mold core is prevented from being slightly displaced by the impact of the material and thus retracting into the moving mold plate, thereby improving the positioning accuracy of the moving mold core and the mold core and increasing the finished product qualification rate. Attached Figure Description

[0018] The accompanying drawings further illustrate the present invention, but the embodiments in the drawings do not constitute any limitation on the present invention.

[0019] Figure 1 This is a schematic diagram of the structure of the moving mold core provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of the structure of a mold core provided in an embodiment of the present invention; Figure 3 This is a schematic diagram of the structure of a large outer cover injection mold for easy core replacement according to an embodiment of the present invention; Figure 4 for Figure 3 A magnified view of a portion of region A in the middle; Figure 5 This is a schematic diagram of the structure of a template provided in an embodiment of the present invention; Figure 6 A three-dimensional injection molded product provided in an embodiment of this utility model Figure 1 ; Figure 7 A three-dimensional injection molded product provided in an embodiment of this utility model Figure 2 ; Markings in the diagram: 1: Fixed mold core; 2: Through hole; 3: Fixed mold insert; 4: Moving mold core; 5: Core body; 6: Base; 7: Positioning insert; 8: Positioning structure. Detailed Implementation

[0020] The specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of this utility model.

[0021] It should be noted that, in this utility model, unless otherwise stated, when an element is referred to as "fixed to" or "set on" another element, it can be directly on the other element or may have an intervening element present simultaneously. "Inner" and "outer" refer to the inner and outer contours of a specific part. "Far" and "near" refer to the distance from or near to a certain component.

[0022] like Figures 1-5As shown in the figure, an embodiment of the present invention provides a large outer cover injection mold for easy core replacement, comprising: Dynamic template; Movable mold core 4, which is embedded in the movable template; A fixed template has a main runner on its surface away from the moving mold core 4. A cold slug groove is provided in the center of the main runner. Several branch runners are connected to both ends of the main runner. The center line of the branch runners intersects the center line of the main runner at an inclination. A fixed mold core 1 is embedded in a fixed template, and the fixed mold core 1 has a plurality of through holes 2 evenly spaced along its length. A fixed mold insert 3 is provided in a one-to-one correspondence with the through hole 2. The fixed mold insert 3 is located inside the through hole 2 at the end away from the moving mold core 4. A cavity is formed between the surface of the fixed mold insert 3 near the moving mold core 4 and the inner wall of the through hole 2. The core and the cavity are arranged opposite to each other. Each core is integrally formed and connected by a base 6 and a core body 5. The base 6 abuts against the moving template. One end of the core body 5 is located at the center of the upper surface of the base 6, and the other end of the core body 5 passes through the moving mold core 4. Positioning inserts 7 are provided through both ends of the core body 5. The positioning insert 7 includes an insert body and a positioning structure 8. The positioning structure 8 is fixed in the middle of the insert body and is sandwiched between the moving mold core 4 and the base 6. Each of the fixed mold inserts 3 is provided with a glue injection component in the middle. The glue injection component is provided with a vertical straight channel. One end of the vertical straight channel is connected to the center of the cavity, and the other end of the vertical straight channel corresponds to and is connected to the end of the branch channel away from the main channel.

[0023] The insert body is a T-shaped inclined column with both ends penetrating the base 6 and the core body 5, respectively. The center line of the insert body intersects the center line of the core body 5 at an angle. When installing the positioning insert 7, the positioning insert 7 is inserted into the core body 5 and the base 6 at an angle. The positioning insert 7 and the positioning structure 8 are fixed by the moving mold core 4 to prevent the positioning insert 7 from being driven by the fixed mold to slide during production when the mold is opened.

[0024] The positioning structure 8 includes a protrusion with an inverted L-shaped cross-section. The protrusion is fixed to the middle of the side of the positioning insert 7 away from the core. The two ends of the protrusion contact the lower surface of the moving mold core 4 and the upper surface of the base 6, respectively. The inverted L-shaped protrusion positions the minimum distance between the base 6 and the moving mold core 4, and the moving mold core positions the base 6, thereby improving the accuracy of the relative positions of the base 6, the positioning structure 8, and the core.

[0025] The core body 5 has a circular groove at the center of its surface near the fixed mold insert 3. An ejector pin is located inside the circular groove. The bottom of the circular groove and the end face of the ejector pin near the fixed mold insert 3 are coplanar, and both the bottom of the circular groove and the end face of the ejector pin near the fixed mold insert 3 are spherical crown-shaped curved surfaces. Molten material enters the circular groove through a vertical straight channel, and the circular groove buffers the material flow rate. The molten material inside the circular groove will slowly overflow to other parts of the cavity, eventually filling the cavity. The bottom of the circular groove is spherical to avoid the formation of sharp corners on the inner wall of the circular groove, which could affect the product molding quality.

[0026] The injection component includes a frustum. The fixed mold insert 3 has a conical hole at its center for accommodating the injection component. A vertical flow channel is located inside the conical hole in the middle of the frustum. The end face of the frustum near the core is a spherical crown-shaped curved surface. One end of the vertical flow channel is connected to the center of the end face of the frustum near the core. The injection component is positioned through the conical hole, and molten material is injected into the cavity through the vertical flow channel. The end face of the frustum near the core forms a circular recess on the outer wall of the product.

[0027] The diameter 'a' of the end face of the frustum near the core and the diameter 'b' of the bottom of the circular groove satisfy the following relationship: a < b. A circular recess is formed at the center of the product by fitting the end face of the frustum near the core with the bottom of the circular groove.

[0028] The cross-sectional size of the cavity decreases in a stepwise manner away from the center line of the fixed mold core 1, and the runner is equipped with a flow-blocking insert. Multiple cavities for molding products of different sizes and specifications are set on the same mold set, and the flow-blocking insert controls the opening or closing of each runner. The same mold set can mold products of various sizes and specifications, improving mold versatility.

[0029] The cross-section of the core decreases in a stepped manner away from the center line of the rear mold core, and the runners are equipped with flow-blocking inserts. Multiple cores for molding products of different sizes are set on the same mold, and the flow-blocking inserts control the opening or closing of each runner. The same mold can mold products of various sizes, improving mold versatility.

[0030] The cross-sectional size of the fixed mold insert 3 decreases in a stepped manner towards the core, and the cross-sectional size of the through hole 2 also decreases in a stepped manner towards the core. The end of the fixed mold insert 3 closest to the core is clearance-fitted with the through hole 2. The side of the fixed mold insert 3 has a stepped groove, and the through hole 2 is a stepped hole. The fit between the fixed mold insert 3 and the through hole 2 helps to improve the accuracy of the relative position between the fixed mold insert 3 and the fixed mold core 1.

[0031] The cross-sectional size of the core body 5 gradually decreases towards the fixed mold insert 3. The moving mold core 4 has a tapered hole. The side of the core body 5 near the fixed mold insert 3 has an inclined surface, the inclination of which is equal to the inclination of the inner wall of the tapered hole. The tapered hole helps to position the core body 5, improving the accuracy of the relative position between the core and the moving mold core 4.

[0032] In one embodiment, the base 6 has a through hole, one end of the core body 5 passes through the through hole, and the positioning insert 7 is integrally formed and connected to the core. The two ends of the positioning insert 7 abut against the base 6 and the moving mold core 4, respectively. This reduces the number of parts and improves assembly and mold change speeds.

[0033] The technical features of the embodiments described above can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of this utility model, and these should all be considered to be within the scope of this specification.

Claims

1. A large outer cover injection mold for easy core replacement, characterized in that: include: The moving mold core is embedded in the moving template. A fixed mold core, wherein a plurality of through holes are evenly spaced along the length direction; A fixed mold insert is provided, which corresponds one-to-one with the through hole. The fixed mold insert is located inside the through hole at the end away from the moving mold core. A cavity is formed between the surface of the fixed mold insert near the moving mold core and the inner wall of the through hole. The core and the cavity are arranged opposite to each other. Each core is composed of a base and a core body fixedly connected. One end of the core body is located at the center of the upper surface of the base, and the other end of the core body passes through the moving mold core. Positioning inserts are provided through both ends of the core body. The positioning insert includes an insert body and a positioning structure. The positioning structure is fixed in the middle of the insert body and is sandwiched between the moving mold core and the base. Each of the fixed mold inserts is provided with a glue injection component in the middle. The glue injection component is provided with a vertical straight channel. The two ends of the vertical straight channel are respectively connected to the main channel of the fixed mold plate and the center of the cavity.

2. The large outer cover injection mold for easy core replacement according to claim 1, characterized in that: The insert body is a T-shaped oblique prism with both ends penetrating the base and the core body, and the center line of the insert body intersects the center line of the core body at an angle.

3. The large outer cover injection mold for easy core replacement according to claim 2, characterized in that: The positioning structure includes a protrusion with an inverted L-shaped cross-section. The protrusion is fixed to the middle of the side of the positioning insert away from the core, and the two ends of the protrusion are in contact with the lower surface of the moving mold core and the upper surface of the base, respectively.

4. The large outer cover injection mold for easy core replacement according to claim 3, characterized in that: The core body has a circular groove at the center of the surface near the fixed mold insert, and the bottom of the circular groove is a spherical crown-shaped curved surface.

5. The large outer cover injection mold for easy core replacement according to claim 3, characterized in that: The glue injection component includes a frustum, the vertical straight channel is located in the middle of the frustum, the end face of the frustum near the core is a spherical crown-shaped curved surface, and one end of the vertical straight channel is connected to the center of the end face of the frustum near the core.

6. The large outer cover injection mold for easy core replacement according to claim 5, characterized in that: The diameter 'a' of the end face of the frustum near the core and the diameter 'b' of the bottom of the circular groove satisfy the following relationship: a < b.

7. The large outer cover injection mold for easy core replacement according to claim 1, characterized in that: The size of the cross-section of the cavity decreases in a stepwise manner away from the center line of the mold core.

8. The large outer cover injection mold for easy core replacement according to claim 1, characterized in that: The cross-section of the core decreases in stages along the direction away from the center line of the rear mold core.

9. The large outer cover injection mold for easy core replacement according to claim 1, characterized in that: The size of the cross-section of the fixed mold insert decreases in a stepwise manner towards the core, and the size of the cross-section of the through hole decreases in a stepwise manner towards the core. The end of the fixed mold insert near the core is clearance-fitted with the through hole.

10. The large outer cover injection mold for easy core replacement according to claim 1, characterized in that: The cross-sectional size of the core body gradually decreases along the direction close to the fixed mold insert. The moving mold core has a tapered hole. The side of the core body has an inclined surface near the fixed mold insert. The inclination of the inclined surface is equal to the inclination of the inner wall of the tapered hole.

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