CN216885054U - Lower die mechanism and injection mold thereof - Google Patents

Abstract

The utility model discloses a lower die mechanism which comprises a lower die plate and a lower die core, wherein the lower die core is arranged on the lower die plate, and the lower die mechanism is characterized in that a first slide block device and a second slide block device are arranged on the lower die plate, the first slide block device and the second slide block device are respectively arranged on two sides of the lower die core in a sliding manner, the first slide block device and the second slide block device respectively at least have a first position close to the lower die core and a second position far away from the lower die core relative to the lower die plate, the lower die core and the first slide block device and the second slide block device which are both arranged at the first position jointly enclose an injection molding cavity, the first slide block device is provided with a pushing slide block, and the lower die core is of a structure with a variable size. The lower die mechanism can avoid pulling and damaging plastic parts during demoulding. In addition, the utility model also discloses an injection mold.

Description

Lower die mechanism and injection mold thereof

Technical Field

The utility model relates to the field of injection molds, in particular to a lower mold mechanism and an injection mold thereof.

Background

In the field of mold injection, a product processed by a mold is often provided with a back-off structure. As shown in fig. 9, for the plastic part shaped like "Ω", the reverse buckle is located inside the plastic part, and the reverse buckle is separated from the widest side of the plastic part by "U", if the plastic part is directly demoulded, the widest side of the plastic part can be damaged or pulled, which affects the processing quality, and even causes inferior products and waste products.

Therefore, there is a need for a lower mold mechanism and an injection mold thereof that can avoid pulling out and damaging the plastic part during demolding.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a lower die mechanism for preventing a plastic part from being damaged and damaged by pulling during demoulding.

Another object of the present invention is to provide an injection mold capable of preventing plastic parts from being damaged and damaged by pulling

In order to achieve the purpose, the lower die mechanism is suitable for being combined with the upper die mechanism to form an injection die, and the injection die is used for producing a plastic part with a back-off. The lower die mechanism comprises a lower die plate and a lower die core, the lower die core is arranged on the lower die plate, a first slider device and a second slider device are arranged on the lower die plate, the first slider device and the second slider device are respectively arranged on two sides of the lower die core in a sliding manner, the first slider device and the second slider device respectively at least have a first position close to the lower die core and a second position far away from the lower die core relative to the lower die plate, the lower die core and the first slider device and the second slider device which are both arranged at the first position jointly enclose an injection molding cavity, the first slider device is provided with a pushing slider, and the lower die core is of a structure with a variable size; when the injection mold is opened, the lower mold core is retracted inwards to be reduced, the pushing slide block pushes the reverse buckle to be far away from the second slide block device, and the second slide block device and the first slide block device are switched from the first position to the second position firstly and then so as to realize the demolding of the plastic part.

Preferably, the lower mold core has a tendency of decreasing in-shrinkage.

Preferably, the lower mold core comprises a lower mold core base, a fixed mold core structure and a movable sliding block, the fixed mold core structure is installed on the lower mold core base, the movable sliding block is installed on the lower mold core base in a sliding manner and located beside the fixed mold core structure, the first sliding block device and the second sliding block device are installed on the lower mold core base in a sliding manner, the second sliding block device surrounds the fixed mold core structure and the movable sliding block, the movable sliding block is right opposite to the end of the second sliding block device, and the pushing sliding block is located on one side of the end of the second sliding block device.

Preferably, the lower mold core further comprises a first elastic piece arranged between the lower mold core base and the movable sliding block, and the first elastic piece constantly has a tendency of driving the movable sliding block to be away from the end of the second sliding block device.

Preferably, the lower mold core base is provided with a mounting groove, the bottom of the mounting groove is provided with a slide rail structure, and the movable slider is arranged in the mounting groove and slidably mounted on the slide rail structure.

Preferably, the pushing slider has a constant tendency to move away from the end of the second slider means.

Preferably, the first slider device further includes a first driver and a first slider structure, the first driver is installed on the lower template, the first slider structure is slidably disposed on the lower mold core base and the lower template, the first slider structure is installed at an output end of the first driver, the first driver drives the first slider structure to slide away from or close to the movable slider, and the pushing slider is slidably installed on the first slider structure.

Preferably, the first slider device further includes a second elastic member installed between the first slider structure and the pushing slider, the second elastic member constantly has a tendency of driving the pushing slider to move away from the end of the second slider device, the first slider structure is provided with a chute structure, and the pushing slider is slidably installed in the chute structure.

Preferably, the second slider device includes a second driver and a second slider structure, the second driver is installed on the lower template, the second slider structure is slidably disposed on the lower core base and the lower template, the second slider structure is installed at an output end of the second driver, the second driver drives the second slider structure to slide away from or close to the movable slider, the second slider structure has a notch, the fixed core structure and the movable slider are both located in the notch when the second slider device is located at the first position, and the second slider structure surrounds the fixed core structure and the movable slider.

In order to achieve the other purpose, the injection mold comprises an upper mold mechanism and the lower mold mechanism, wherein the upper mold mechanism comprises an upper mold plate and an upper mold core arranged on the upper mold plate, a diagonal draw bar is arranged at the bottom of the upper mold core, and the diagonal draw bar drives the lower mold core to expand outwards and synchronously drives the pushing slide block to slide close to the end part of the first slide block device when the injection mold is closed.

Compared with the prior art, after the injection mold is opened, the lower mold core is retracted inwards and becomes small, so that the interval between the lower mold core and the second slide block device becomes large, a sliding space of the pushing slide block is provided, and the pushing slide block can push the back-off to be far away from the end part of the second slide block device. After the second sliding block device is switched from the first position to the second position, the plastic part is integrally separated from the second sliding block device. Then, after the first sliding block device is switched from the first position to the second position, the whole plastic part is also separated from the first sliding block device, at the moment, the demoulding of the plastic part is completed, and then the plastic part can be taken away. In the demolding process, the pushing slide block pushes the inverted buckle to be far away from the end part of the second slide block device, so that a section of the structure, close to the inverted buckle, of the plastic part is bent inwards and deformed, the widest outer side of the plastic part is folded inwards, and in the process that the first slide block device is switched from the first position to the second position, the first slide block device cannot cut and rub or rub the widest side of the plastic part, so that the plastic part is prevented from being damaged and pulled during demolding.

Drawings

FIG. 1 is a front view of the injection mold of the present invention when closed.

Fig. 2 is a plan view of the lower mold mechanism during mold clamping.

Fig. 3 is a perspective view of the lower mold mechanism when clamping the mold.

Fig. 4 is a front view of the injection mold when the mold is opened.

Fig. 5 is a plan view of the lower die mechanism when opening the die.

Fig. 6 is a plan view of the lower die mechanism shown in fig. 5 when the second slider device is switched from the first position to the second position.

Fig. 7 is a plan view of the lower die mechanism shown in fig. 6 when the first slider device is switched from the first position to the second position.

FIG. 8 is a perspective view of the lower die mechanism shown in FIG. 3 with the movable slide and the ejector slide hidden

Fig. 9 is a top view of a plastic part being processed.

Fig. 10 is a perspective view of the upper die mechanism.

Detailed Description

In order to explain technical contents and structural features of the present invention in detail, the following description is made with reference to the embodiments and the accompanying drawings.

As shown in fig. 1 to 10, the injection mold 100 of the present invention is used to produce a plastic part 200 with a back-off 210. Specifically, plastic part 200 is shaped like an "Ω", and undercut 210 is located inside plastic part 200, but not limited thereto. The plastic part 200 has the reverse buckles 210 at both ends, but not limited thereto. It is noted that injection mold 100 can also be used to produce plastic part 200 having other shapes and configurations, and plastic part 200 can also be provided with undercut 210 at only one end.

The injection mold 100 includes a lower die mechanism 10 and an upper die mechanism 20 used in combination. The upper die mechanism 20 includes an upper die plate 21 and an upper die core 22 attached to the upper die plate 21. The lower die mechanism 10 comprises a lower die plate 11 and a lower die core 12, and the lower die core 12 is mounted on the lower die plate 11. The lower template 11 is provided with a first slide block device 13 and a second slide block device 14. The first slider device 13 and the second slider device 14 are respectively slidably mounted on two sides of the lower mold core 12, the first slider device 13 and the second slider device 14 respectively have at least a first position close to the lower mold core 12 and a second position far away from the lower mold core 12 relative to the lower mold plate 11, and the lower mold core 12, the first slider device 13 and the second slider device 14 which are located at the first position together enclose an injection molding cavity 15. The first slide block device 13 has a pushing slide block 131, and the lower mold core 12 has a variable size structure. When the injection mold 100 is opened, the lower mold core 12 is retracted and becomes smaller, the pushing slider 131 pushes the reverse buckle 210 away from the second slider device 14, and the second slider device 14 and the first slider device 13 are switched from the first position to the second position one after the other, so as to realize the demolding of the plastic part 200. After the injection mold 100 is opened, the lower mold core 12 is retracted and reduced, so that the space between the lower mold core 12 and the second slide block device 14 is increased, a sliding space for the pushing slide block 131 is provided, and the pushing slide block 131 can push the undercut 210 away from the end of the second slide block device 14. After the second slider device 14 is switched from the first position to the second position, the plastic member 200 is entirely separated from the second slider device 14. Then, after the first slider device 13 is switched from the first position to the second position, the plastic part 200 is also separated from the first slider device 13, and at this time, the plastic part 200 is demolded, and then the plastic part 200 can be taken away. In the demolding process, the pushing slider 131 pushes the end part of the inverted buckle 210 far away from the second slider device 14, so that a section of the structure of the plastic part 200 close to the inverted buckle 210 is bent inwards and deformed, the widest outer side of the plastic part 200 is folded inwards, and in the process that the first slider device 13 is switched from the first position to the second position, the first slider device 13 cannot scratch or rub the widest side of the plastic part 200, so that the plastic part 200 is prevented from being damaged by pulling and being damaged in the demolding process.

It should be noted that, the second slider device 14 and the first slider device 13 are switched from the first position to the second position first and then, means that the second slider device 14 moves from the first position to the second position first, and then the first slider device 13 moves from the first position to the second position.

As shown in fig. 2, 3, 5 to 8, the lower mold core 12 has a tendency of decreasing in-draw, and after the injection mold 100 is opened, the lower mold core 12 can automatically decrease in-draw. Specifically, the lower mold core 12 includes a lower mold core base 121, a fixed mold core structure 122 and a movable slide 123. The fixed mold core structure 122 is installed on the lower mold core base 121, and the movable sliding block 123 is installed on the lower mold core base 121 in a sliding manner and located beside the fixed mold core structure 122. The first slider device 13 and the second slider device 14 are slidably disposed on the lower mold core base 121, the second slider device 14 surrounds the fixed mold core structure 122 and the movable slider 123, the movable slider 123 faces the end of the second slider device 14, and the pushing slider 131 is located on one side of the end of the second slider device 14. When the movable sliding block 123 slides in an inward-contracting manner, the structure of the lower mold core 12 becomes gradually smaller, and when the movable sliding block 123 slides in an outward-expanding manner, the structure of the lower mold core 12 becomes gradually larger. It is noted that the end of the second slider device 14, the ejector slider 131 and the movable slider 123 are arranged adjacently and enclose a cavity forming the undercut 210.

Further, the lower mold core 12 further includes a first elastic member 124 installed between the lower mold core base 121 and the movable sliding block 123, and the first elastic member 124 has a tendency to drive the movable sliding block 123 away from the end of the second sliding block device 14. When the injection mold 100 is opened, the movable slide 123 is automatically retracted by the first elastic member 124. For example, the first elastic member 124 is a spring, but is not limited thereto. Preferably, the lower mold core base 121 is provided with a mounting groove 1211, the bottom of the mounting groove 1211 is provided with a slide rail structure 125, and the movable slider 123 is provided in the mounting groove 1211 and slidably mounted on the slide rail structure 125. With such a design, the movable slider 123 is stably mounted on the lower mold core base 121 and can stably slide on the lower mold core base 121. The first elastic member 124 is installed in the installation groove 1211, but is not limited thereto. The slide rail structure 125 is disposed at the top of the lower mold core base 121 in an inclined manner, so that the extending direction of the slide rail structure 125 is substantially perpendicular to the tangential direction of the undercut 210.

As shown in fig. 2, fig. 3, fig. 5 to fig. 8, the pushing slide block 131 always has a tendency to be far away from the end of the second slide block device 14, and after the injection mold 100 is opened, the pushing slide block 131 can automatically push the end of the back-off button 210 far away from the end of the second slide block device 14. In particular, the first slider arrangement 13 further comprises a first driver 132 and a first slider structure 133. The first driver 132 is installed on the lower mold plate 11, the first slider structure 133 is slidably installed on the lower mold core base 121 and the lower mold plate 11, the first slider structure 133 is installed at an output end of the first driver 132, the first driver 132 drives the first slider structure 133 to slide away from or close to the movable slider 123, and the pushing slider 131 is slidably installed on the first slider structure 133. When the first driver 132 drives the first slider structure 133 to move away from the movable slider 123, the pushing slider 131 moves away from the reversing structure 210, so as to realize demolding. For example, the first driver 132 is a cylinder, but is not limited thereto.

Further, the first slider device 13 further includes a second elastic element 134 installed between the first slider structure 133 and the pushing slider 131. The second elastic element 134 has a constant tendency to drive the pushing slider 131 away from the end of the second slider device 14. The first sliding block structure 133 is provided with a sliding slot structure 1331, and the pushing sliding block 131 is slidably mounted on the sliding slot structure 1331. When the injection mold 100 is opened, the second elastic element 134 pushes the pushing slide block 131, so that the pushing slide block 131 automatically pushes the end of the inverse buckle 210 away from the second slide block device 14. The pushing slide block 131 can be stably installed on the first slide block structure 133 by means of the slide groove structure 1331. Because both ends of the plastic part 200 have the back-off 210, the first slider device 13 is provided with two sets of first slider structures 133, and the two first slider structures 133 are spread out in a V-shape, but not limited thereto. Correspondingly, the lower mold core 12 is provided with two movable sliding blocks 123, and each movable sliding block 123 is matched with the first sliding block structure 133.

As shown in fig. 2, 3, 5, 6, 7 and 8, the second slider arrangement 14 includes a second driver 141 and a second slider structure 142. The second driver 141 is installed on the lower die plate 11, the second slider structure 142 is slidably disposed on the lower die core base 121 and the lower die plate 11, the second slider structure 142 is installed at an output end of the second driver 141, the second driver 141 drives the second slider structure 142 to move away from or close to the movable slider 123, the second slider structure 142 has a notch 1421, the fixed die core structure 122 and the movable slider 123 are both located in the notch 1421 when the second slider device 14 is at the first position, and the second slider structure 142 surrounds the fixed die core structure 122 and the movable slider 123. The gap 1421 is a U-shaped gap, and correspondingly, the fixed mold structure 122 is a half-moon-shaped structure, but not limited thereto. It is noted that the end of the second slider arrangement 14 is the end of the second slider structure 142.

When the injection mold 100 is closed, in order to drive the pushing slide block 131 and the movable slide block 123 to reset, the inclined pull rod 23 is installed at the bottom of the upper mold core 22, and when the injection mold 100 is closed, the inclined pull rod 23 drives the lower mold core 12 to expand outwards and synchronously drives the pushing slide block 131 to slide close to the end of the first slide block device 13. The outward expansion of the lower mold core 12 is opposite to the inward contraction of the lower mold core 12, but not limited thereto. In order to facilitate the sliding by pushing, the pushing slider 131 and the movable slider 123 are both provided with through-hole structures 126 arranged obliquely, and after the diagonal draw bar 23 is inserted into the through-hole structures 126, the pushing slider 131 and the movable slider 123 are pulled to slide close to the end of the second slider structure 142.

In order to ensure the accurate die assembly of the upper die mechanism 20 and the lower die mechanism 10 and enhance the support and guidance, the lower die plate 11 is provided with a plurality of guide posts 16, a plurality of guide sleeves 24 are correspondingly arranged in the upper die plate 21, and when the upper die mechanism 20 and the lower die mechanism 10 are in die assembly, the guide posts 16 firstly extend into the guide sleeves 24. When the upper mold mechanism 20 and the lower mold mechanism 10 are opened, the guide post 16 extends out of the guide sleeve 24.

The process of the injection mold 100 of the present invention is described as follows: when the injection mold 100 is closed, the upper mold mechanism 20 moves downward, and the upper mold mechanism 20 and the lower mold mechanism 10 are closed. And injecting glue solution into the injection molding cavity 15, moving the upper mold mechanism 20 upwards after the plastic part 200 is molded, and opening the upper mold mechanism 20 and the lower mold mechanism 10. After the mold is opened, the first elastic element 124 drives the movable slider 123 to move away from the end of the second slider structure 142, and simultaneously, the second elastic element 134 drives the pushing slider 131 to move away from the end of the second slider structure 142, so that the pushing slider 131 pushes the end of the flip-flop 210 away from the second slider structure 142, and a section of the plastic part 200 close to the flip-flop 210 is bent inward and deformed. Subsequently, the second slider device 14 is switched from the first position to the second position, that is, the second driver 141 drives the second slider structure 142 to slide away from the movable slider 123, so that the plastic part 200 is integrally separated from the second slider device 14. Then, the first slider device 13 is switched from the first position to the second position, i.e. the first driver 132 drives the first slider structure 133 to slide away from the movable slider 123, so that the plastic part 200 is also integrally separated from the first slider device 13, and then the inverse buckle 210 deforms and returns to the original position, so as to realize the demolding of the plastic part 200, and at this time, the plastic part 200 can be taken away.

The above disclosure is only a preferred embodiment of the present invention, and should not be taken as limiting the scope of the utility model, so that the appended claims are intended to cover all such modifications and changes as fall within the true spirit of the utility model.

Claims (10)

1. A lower die mechanism is suitable for being combined with an upper die mechanism to form an injection mold, the injection mold is used for producing plastic parts with back-off, the lower die mechanism comprises a lower die plate and a lower die core, the lower die core is arranged on the lower die plate, it is characterized in that a first slide block device and a second slide block device are arranged on the lower template, the first slide block device and the second slide block device are respectively arranged on two sides of the lower die core in a sliding way, the first slide block device and the second slide block device respectively at least have a first position close to the lower die core and a second position far away from the lower die core relative to the lower template, the lower template, the lower die core, the first slide block device and the second slide block device which are all positioned at the first position together enclose an injection molding cavity, the first sliding block device is provided with a pushing sliding block, and the lower die core is of a structure with a variable size; when the injection mold is opened, the lower mold core is retracted inwards to be reduced, the pushing slide block pushes the reverse buckle to be far away from the second slide block device, and the second slide block device and the first slide block device are switched from the first position to the second position firstly and then so as to realize the demolding of the plastic part.

2. The lower die mechanism as claimed in claim 1, wherein the lower die core has a constant tendency to shrink inward.

3. The lower die mechanism according to claim 1, wherein the lower die core includes a lower die core base, a fixed die core structure and a movable slide block, the fixed die core structure is mounted on the lower die core base, the movable slide block is slidably mounted on the lower die core base and located beside the fixed die core structure, the first slide block device and the second slide block device are slidably disposed on the lower die core base, the second slide block device is disposed to surround the fixed die core structure and the movable slide block, the movable slide block faces an end of the second slide block device, and the pushing slide block is located on one side of the end of the second slide block device.

4. The lower die mechanism according to claim 3, wherein the lower die core further comprises a first elastic member installed between the lower die core base and the movable slide block, and the first elastic member constantly has a tendency to drive the movable slide block away from the end of the second slide block device.

5. The lower die mechanism according to claim 3, wherein the lower die core base has a mounting groove, a slide rail structure is mounted at the bottom of the mounting groove, and the movable slider is disposed in the mounting groove and slidably mounted on the slide rail structure.

6. The lower die mechanism according to claim 1, wherein the ejector slide has a constant tendency to move away from the end of the second slide means.

7. The lower die mechanism as claimed in claim 3, wherein the first slide block device further comprises a first driver and a first slide block structure, the first driver is mounted on the lower die plate, the first slide block structure is slidably disposed on the lower die core base and the lower die plate, the first slide block structure is mounted at an output end of the first driver, the first driver drives the first slide block structure to slide away from or close to the movable slide block, and the pushing slide block is slidably mounted on the first slide block structure.

8. The lower die mechanism according to claim 7, wherein the first slide block device further includes a second elastic member installed between the first slide block structure and the pushing slide block, the second elastic member constantly has a tendency to drive the pushing slide block to move away from an end of the second slide block device, the first slide block structure is provided with a sliding groove structure, and the pushing slide block is slidably installed in the sliding groove structure.

9. The lower die mechanism according to claim 3, wherein the second slider device includes a second driver and a second slider structure, the second driver is mounted on the lower die plate, the second slider structure is slidably disposed on the lower die core base and the lower die plate, the second slider structure is mounted at an output end of the second driver, the second driver drives the second slider structure to slide away from or close to the movable slider, the second slider structure has a gap, the fixed die core structure and the movable slider are both located in the gap when the second slider device is in the first position, and the second slider structure surrounds the fixed die core structure and the movable slider.

10. An injection mold, characterized in that, includes upper die mechanism and the lower die mechanism of any one of the above claims 1-9, upper die mechanism includes the cope match-plate pattern and installs in the last mould benevolence of cope match-plate pattern, the bottom of last mould benevolence is installed and is drawn to one side the pull rod, draw the pull rod to order about when injection mold closes the die lower mould benevolence outwards expand and in step order to order about the top pushes away the slider and do the slip near the tip of first slider device.

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