Injection mold with a cylinder anti-retraction mechanism and injection method

Abstract

The present disclosure provides an injection mold with an oil cylinder anti-retreating mechanism and an injection method, and belongs to the technical field of injection molds. The injection mold comprises a mold plate, an anti-retreating assembly and an oil cylinder. The upper surface of the mold plate is provided with a mold core for forming a product. The oil cylinder is fixed to the side surface of the mold plate through a fixing plate. The anti-retreating assembly is located between the mold plate and the oil cylinder. The telescopic shaft of the oil cylinder is connected with the anti-retreating assembly. The present disclosure simplifies the structure of the anti-retreating mechanism on the conventional injection mold, so that small molds also have the anti-retreating function.

Description

TECHNICAL FIELD

[0001] The present disclosure belongs to the technical field of injection molds, and particularly relates to an injection mold with an oil cylinder anti-retreating mechanism and an injection method. BACKGROUND

[0002] With the rapid development of the automobile industry, the application of plastic products on automobiles is also expanding, and the structure of plastic parts is becoming more and more complex. Since the product structure has a functional role, this structure cannot be eliminated by adjusting the product ejection angle, so it is necessary to add a core-pulling mechanism to the mold.

[0003] In mold design, oil cylinder core pulling is a commonly used mechanism, especially fixed mold oil cylinder core pulling. The oil cylinder core pulling cannot be locked by the clamping force of the injection molding machine, but only by the force of the oil cylinder. Due to the lack of accuracy of the oil cylinder, the core often retreats under the pressure of the injection molding machine, resulting in product excess glue, burr, etc.

[0004] The inventor found that the existing anti-retreating device structure is relatively complex, has a high failure rate, and cannot be applied to small molds used in automobile part injection molding. SUMMARY

[0005] In view of the defects or deficiencies in the prior art, the present disclosure provides an injection mold with an oil cylinder anti-retreating mechanism and an injection method, which simplifies the structure of the anti-retreating mechanism on the traditional injection mold, and enables small molds to also have anti-retreating function.

[0006] To achieve the above-mentioned purpose, the present disclosure adopts the following technical solutions:

[0007] In a first aspect, the embodiments of the present disclosure provide an injection mold with an oil cylinder anti-retreating mechanism, comprising a mold plate, an anti-retreating assembly and an oil cylinder, the upper surface of the mold plate is provided with a mold core for forming a product, the oil cylinder is fixed on the side of the mold plate through a fixing plate, the anti-retreating assembly is located between the mold plate and the oil cylinder, and the telescopic shaft of the oil cylinder is connected with the anti-retreating assembly.

[0008] Further, the anti-retreating assembly comprises a sliding block, a push block and a locking block, and the sliding block is arranged in a sliding block groove formed between the mold core and the oil cylinder.

[0009] Further, the top of the sliding block groove is provided with a pressing strip, and the bottom surface of the pressing strip is in contact with the top of the sliding block.

[0010] Further, one end of the sliding block is provided with an insert, the bottom of the sliding block is provided with a push block groove and a first locking block groove, the push block groove and the first locking block groove are perpendicular to each other, and the end surface of the push block groove is flush with the side surface of the first locking block groove.

[0011] Further, the depth of the push block groove is equal to the height of the push block, the push block is a cuboid structure, one side of the bottom of the push block is provided with an inclined surface, the angle between the inclined surface and the horizontal plane is 45°, one side of the inclined surface is connected with the bottom surface of the push block, and the other side is connected with the side surface of the push block.

[0012] Further, a threaded hole is arranged at the middle part of the push block, and the threaded hole is matched with the thread at the end of the telescopic shaft of the oil cylinder.

[0013] Further, the depth of the first locking groove is less than the height of the locking block, the locking block is a cuboid structure, an arc-shaped groove for the movement of the telescopic shaft of the oil cylinder is arranged at the top of the locking block, one side of the arc-shaped groove is provided with a sliding groove, the bottom surface of the sliding groove is an inclined surface, and the inclined surface of the sliding groove is matched with the inclined surface of the bottom of the push block.

[0014] Further, a second locking block groove is arranged at the bottom of the sliding block groove, and the depth of the second locking block groove is greater than the height of the locking block.

[0015] Further, a compression spring is arranged at the bottom of the locking block.

[0016] In the second aspect, the embodiments of the present disclosure provide an injection molding method using the injection mold with the oil cylinder anti-retreating mechanism as described above, and the injection molding method comprises the following steps:

[0017] The insert is arranged on the insert at the end of the sliding block;

[0018] When the mold is closed, the oil cylinder is started, the oil cylinder drives the push block and the sliding block to jointly advance, when the first locking block groove is located on the second locking block groove, the oil cylinder is closed, and the product is injection molded;

[0019] When the mold is opened, the oil cylinder is started, the oil cylinder drives the push block to retreat until the side surface of the push block is in contact with the end surface of the push block groove, the push block continues to move and drives the sliding block to get out of the product reverse buckling position, the product is normally ejected under the action of the mold ejection system, and the mold opening is completed.

[0020] Compared with the prior art, the present disclosure has the following beneficial effects:

[0021] 1. The present disclosure can prevent the core from retreating during injection molding by the mutual cooperation of the sliding block, the push block and the locking block, and does not hinder the normal mold opening.

[0022] 2. The present disclosure greatly simplifies the structure of the traditional anti-retreating mechanism, and realizes the oil cylinder anti-retreating through the mutual cooperation of the sliding block, the push block and the locking block, so that the small mold also has the anti-retreating function. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1Figure 1 is a sectional view of an injection mold according to an embodiment of the present disclosure;

[0024] Figure 2 Figure 2 is an exploded view of the injection mold according to an embodiment of the present disclosure;

[0025] Figure 3 Figure 3 is a schematic view of a slider structure according to an embodiment of the present disclosure;

[0026] Figure 4 Figure 4 is a schematic view of a locking block structure according to an embodiment of the present disclosure;

[0027] In the figure, 1 is a template, 2 is an oil cylinder, 3 is a fixed plate, 4 is a slider, 5 is a push block, 6 is a locking block, 7 is a compression strip, 8 is an insert, 9 is a push block groove, 10 is a first locking block groove, 11 is an arc-shaped groove, 12 is a sliding groove, 13 is a second locking block groove, 14 is a compression spring, and 15 is an insert. DETAILED DESCRIPTION

[0028] The present disclosure is further illustrated below in conjunction with the accompanying drawings and embodiments.

[0029] It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the present disclosure. Unless otherwise indicated, all technical and scientific terms used in the present disclosure have the same meaning as commonly understood by one of ordinary skill in the art to which the present disclosure belongs.

[0030] It should be noted that the terms used herein are only intended to describe specific embodiments and are not intended to limit exemplary embodiments according to the present disclosure. As used herein, unless the present disclosure explicitly indicates otherwise, the singular form is intended to include the plural form, and furthermore, it should be understood that when the terms "comprise" and / or "include" are used in the present specification, they indicate the presence of a feature, step, operation, device, component, and / or combination thereof;

[0031] For the convenience of description, if "up", "down", "left", "right" appear in the present disclosure, they only indicate the same direction as the up, down, left, and right directions of the accompanying drawings themselves, and do not limit the structure, but are only for the convenience of describing the present disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present disclosure.

[0032] Terminology Explanation: The terms “installation,” “connection,” “linking,” and “fixing” in this disclosure should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to an internal connection between two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this disclosure according to the specific circumstances.

[0033] Example 1

[0034] One typical implementation of this disclosure is as follows: Figures 1-4 As shown, an injection mold with a hydraulic cylinder anti-reverse mechanism includes a template 1, an anti-reverse component and a hydraulic cylinder 2. The upper surface of the template 1 is provided with a mold core for molding products. The hydraulic cylinder is fixed to the side of the template by a fixing plate 3. The anti-reverse component is located between the template 1 and the hydraulic cylinder 2. The telescopic shaft of the hydraulic cylinder 2 is connected to the anti-reverse component.

[0035] The anti-retraction component includes a slider 4, a push block 5, and a locking block 6. The slider 4 is disposed in a slider groove between the mold core and the oil cylinder 2. The side wall of the slider groove near the oil cylinder 2 is provided with a through hole for the telescopic shaft of the oil cylinder 2 to pass through. The telescopic shaft of the oil cylinder 2 passes through the side wall of the mold core and extends into the slider groove. Pressure strips 7 are provided on both sides of the top of the slider groove. The bottom surface of the pressure strips 7 contacts the top sides of the slider 4. The slider 4 is embedded in the slider groove by the pressure strips 7 provided on the top of the slider groove. The pressure strips 7 can restrict the vertical movement of the slider 4, so that the slider 4 can only slide along the length direction of the slider groove. The pressure strips 7 are fixed to the mold core by bolts.

[0036] One end of the slider 4 is provided with an insert 8, and the insert 13 can be placed on the insert 8. The bottom of the slider 4 is provided with a push block groove 9 and a first locking block groove 10. The push block groove 9 and the first locking block groove 10 are perpendicular to each other. The push block groove 9 is arranged along the length direction of the slider 4, and the first locking block groove 10 is arranged along the width direction of the slider 4. One end face of the push block groove 9 is flush with the side face of the first locking block groove 10. The length of the first locking block groove 10 is the same as the width of the slider 4.

[0037] The push block 5 is disposed within the push block groove 9, the depth of which is the same as the height of the push block 5. The push block 5 is a cuboid structure with one side of its bottom sloped at an angle of 45° to the horizontal plane. One side of the slope is connected to the bottom surface of the push block 5, and the other side is connected to the side surface of the push block 5. A threaded hole is provided in the middle of the push block 5, which is adapted to the thread at the end of the telescopic shaft of the hydraulic cylinder 2. A through hole is provided on the side wall of the slider 4 away from the insert for the telescopic rod to pass through. The end of the telescopic rod of the hydraulic cylinder 2 passes through the side wall of the template and the side wall of the slider 4 in sequence, and is threadedly connected to the push block 5 disposed in the push block groove 9. The push block 5 can slide along the length direction of the push block groove 9 under the drive of the hydraulic cylinder 2.

[0038] The locking block 6 is disposed in the first locking block groove 10. The depth of the first locking groove 10 is less than the height of the locking block 6. The locking block 6 is a cuboid structure. The top of the locking block 6 is provided with an arc-shaped groove 11 for the movement of the hydraulic cylinder extension shaft. A sliding groove 12 is provided on one side of the arc-shaped groove 11. The bottom surface of the sliding groove 12 is an inclined surface. One side of the inclined surface is connected to the top surface of the locking block 6, and the other side is connected to the side wall of the locking block 6. The bottom surface of the sliding groove 12 is adapted to the inclined surface at the bottom of the push block 5, and the width of the sliding groove 12 is the same as the width of the push block 5. When the hydraulic cylinder 2 drives the push block 5 to move in the push block groove 9, the inclined surface at the bottom of the push block 5 contacts the bottom surface of the sliding groove 12 on the locking block 6. As the hydraulic cylinder 2 continues to move, under the action of the two inclined surfaces, the push block 5 pushes the locking block 6 to move away from the push block 5.

[0039] The bottom of the slider groove is provided with a second locking block groove 13, which corresponds to the first locking block groove 10. The second locking block groove 13 is arranged along the width direction of the slider groove, and the length of the second locking block groove 13 is the same as the width of the slider groove. The depth of the second locking block groove 13 is greater than the height of the locking block 6. When the first locking block groove 10 moves with the slider 4 above the second locking block groove 113, the first locking block groove 10 and the second locking block groove 13 form a channel that allows the locking block 6 to move up and down, so that the locking block 6 located in the second locking block groove 13 can enter the first locking block groove 10, thereby locking the slider 4.

[0040] A compression spring 14 is provided at the bottom of the locking block 6, which can provide the required thrust when the locking block 6 locks the slider 4.

[0041] The injection mold structure disclosed herein is mainly used for small molds where the product has undercuts and requires the use of hydraulic cylinders for core pulling. It is suitable for front mold core pulling, rear mold core pulling, and tunnel core pulling.

[0042] Example 2

[0043] This embodiment provides an injection molding method that utilizes an injection mold with a hydraulic cylinder anti-reverse mechanism as described in Embodiment 1.

[0044] Includes the following steps:

[0045] Place the insert on the insert at the end of the slider.

[0046] When the mold closes, the hydraulic cylinder is activated, pushing the push block and the slider forward together. When the first locking block groove is positioned on top of the second locking block groove, the hydraulic cylinder is deactivated. At this point, the locking block in the second locking block groove enters the first locking block groove under the push of the compression spring, locking the slider and fixing its position to prevent it from retracting during injection molding, thus ensuring normal product injection.

[0047] During mold opening, the hydraulic cylinder is activated, causing the push block to retract until its side contacts the end face of the push block groove. The push block continues to move, causing the slider to disengage from the product's undercut position. The product is then ejected normally by the mold ejection system, completing the mold opening process. During the push block's retraction, the push block moves towards the bottom of the second locking block groove by pressing the locking block against the inclined surface, thus disengaging the locking block from the first locking block groove. When the bottom surface of the push block is above the top surface of the locking block, the bottom surface of the spring block is also above the top surface of the locking block, ensuring the locking block is completely positioned within the second locking block groove. The second locking block groove no longer holds the slider, and simultaneously, the side surface of the push block contacts the end face of the push block groove. The push block continues to move, causing the slider to disengage from the product's undercut position.

[0048] The above description is merely a preferred embodiment of this disclosure and is not intended to limit this disclosure. Various modifications and variations can be made to this disclosure by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this disclosure should be included within the scope of protection of this disclosure.

Claims

1. An injection mold with a hydraulic cylinder anti-reverse mechanism, characterized in that, The device includes a template, an anti-reverse assembly, and a hydraulic cylinder. The upper surface of the template is provided with a mold core for forming products. The hydraulic cylinder is fixed to the side of the template by a fixing plate. The anti-reverse assembly is located between the template and the hydraulic cylinder. The telescopic shaft of the hydraulic cylinder is connected to the anti-reverse assembly. The anti-recoil assembly includes a slider, a push block, and a locking block, wherein the slider is disposed in a slider groove opened between the mold core and the oil cylinder; One end of the slider is provided with an insert, and the bottom of the slider is provided with a push block groove and a first locking block groove. The push block groove and the first locking block groove are perpendicular to each other, and one end face of the push block groove is flush with the side face of the first locking block groove. The push block is set in the push block groove, and a through hole for the telescopic rod to pass through is provided on the side wall of the end of the slider away from the insert.

2. The injection mold with a hydraulic cylinder anti-reverse mechanism as described in claim 1, characterized in that, A pressure strip is provided at the top of the slider groove, and the bottom surface of the pressure strip is in contact with the top of the slider.

3. The injection mold with a hydraulic cylinder anti-reverse mechanism as described in claim 1, characterized in that, The depth of the groove in the push block is equal to the height of the push block. The push block is a cuboid structure with one side of its bottom set as an inclined plane. The angle between the inclined plane and the horizontal plane is 45°. One side of the inclined plane is connected to the bottom surface of the push block, and the other side is connected to the side surface of the push block.

4. The injection mold with a hydraulic cylinder anti-reverse mechanism as described in claim 1, characterized in that, The push block has a threaded hole in the middle, which is adapted to the thread at the end of the cylinder telescopic shaft.

5. An injection mold with a hydraulic cylinder anti-reverse mechanism as described in claim 3, characterized in that, The depth of the first locking groove is less than the height of the locking block. The locking block has a cuboid structure. The top of the locking block is provided with an arc-shaped groove for the movement of the oil cylinder telescopic shaft. A sliding groove is provided on one side of the arc-shaped groove. The bottom surface of the sliding groove is an inclined surface, and the bottom surface of the sliding groove is adapted to the inclined surface of the bottom of the push block.

6. An injection mold with a hydraulic cylinder anti-reverse mechanism as described in claim 1, characterized in that, The bottom of the slider groove is provided with a second locking block groove, and the depth of the second locking block groove is greater than the height of the locking block.

7. An injection mold with a hydraulic cylinder anti-reverse mechanism as described in claim 1, characterized in that, A compression spring is provided at the bottom of the locking block.

8. An injection molding method, utilizing an injection mold with a hydraulic cylinder anti-reverse mechanism as described in any one of claims 1-7, comprising the following steps: Place the insert on the insert at the end of the slider; When the mold is closed, the hydraulic cylinder is activated, which pushes the push block and the slider forward together. When the groove of the first locking block is located on the groove of the second locking block, the hydraulic cylinder is closed, and the product is injected. When the mold is opened, the hydraulic cylinder is activated, which drives the push block to retract until the side of the push block contacts the end face of the push block groove. The push block continues to move, driving the slider to disengage from the product's undercut position. The product is then ejected normally under the action of the mold ejection system, completing the mold opening.

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