CN216182415U - Injection mould - Google Patents

Abstract

The utility model provides an injection mold which comprises a fixed mold template, a movable mold template and an oil cylinder core-pulling mechanism, wherein the oil cylinder core-pulling mechanism comprises an oil cylinder and a loose core; the movable die plate is fixedly provided with a wedging block, the wedging block is provided with a limiting hook part, the limiting hook part is provided with an inclined plane, and a through part is formed on the core pulling; when the mold is closed, the inclined surface is in contact with the through part to drive the core pulling to move towards the drawing-out direction, and in a mold closing state, the wedging block penetrates through the through part and the limiting hook part is hooked on the core pulling. According to the method, the mold can be opened only by drawing out the loose core, so that the condition that the loose core is damaged by pulling and even the oil cylinder is damaged due to mold opening caused by the condition that the loose core is not drawn out is avoided; when the oil cylinder is not drawn out, when the inclined plane of the limiting hook part of the wedge-caulking block contacts the end part of the through part when the die is closed, the inclined plane can drive the core pulling to move towards the drawing-out direction until the core pulling is complete, the die collision can be avoided during the die closing, the mechanical structure replaces manual operation to ensure that the die collision is avoided, and the reliability is high.

Description

Injection mould

Technical Field

The utility model belongs to the technical field of injection molds, and particularly relates to an injection mold capable of preventing a loose core in a reset state on a fixed mold from colliding with a movable mold during mold closing.

Background

In order to meet more functional requirements of some injection molding products, a reverse-buckling hole is designed on the side wall of the appearance surface of the product, such as a reverse-buckling hole 2 on an injection molding product 1 shown in fig. 1. For the back-off hole on the side wall of the injection molding product, the tunnel core pulling is often needed. Most of tunnel loose cores are driven by oil cylinders, the oil cylinders need to act before opening the mold, the loose cores are firstly extracted and then the mold is opened, if the oil cylinders do not act and the mold is opened directly, as shown in fig. 2, as the loose cores 3 and the oil cylinders 4 are arranged on the fixed mold 7, the end parts of the loose cores 3 are embedded into the inverted buckle holes 2, the loose cores 3 are damaged by pulling, and even the oil cylinders 4 are damaged; when the mold is closed, the oil cylinder 4 is ensured to draw out the loose core 3, otherwise, as shown in fig. 3, if the loose core 3 is in an extending reset state, the die can collide with a related structural component (an inclined top 6) on the movable die 5 during mold closing.

In order to solve the problem of mold collision of the mechanism, a mark or a label is usually arranged at an obvious position on a mold, for example, lettering is used for reminding an injection molding technician that the mold opening and closing needs to pay attention to the core-pulling position, the core is firstly pulled before the mold opening and then the mold opening is carried out, and the mold closing can be carried out only by keeping the core pulling in the extraction state during the mold closing. The lettering reminding needs the injection molding technician to keep alert all the time, otherwise, the lettering reminding is easy to ignore forget, so that the mold collision accident is easy to happen, manual operation is needed, the workload is increased, and the reliability is poor.

SUMMERY OF THE UTILITY MODEL

The utility model provides an injection mold, which is characterized in that a mechanical structure replaces manual operation to ensure that a core pulling mold is opened and closed in a drawing-out state, and the occurrence of mold collision is effectively avoided.

In some embodiments of the application, an injection mold is provided, which comprises a fixed mold template and a movable mold template, wherein an oil cylinder core-pulling mechanism is arranged on the fixed mold template, and the oil cylinder core-pulling mechanism comprises an oil cylinder and a core-pulling driven by the oil cylinder; the movable die plate is fixedly provided with a wedging block, the wedging block is provided with a limiting hook part extending to the side of the fixed die plate, an inclined surface is formed on one side of the limiting hook part, a through part for avoiding the wedging block to pass through is formed on the core pulling part, and in the core pulling direction, the distance between the through part and the wedging block is larger than the core pulling distance of the oil cylinder; when the mold is closed, the inclined surface is in contact with the end part of the through part to drive the core pulling to move in the drawing direction, and in the mold closing state, the wedging block penetrates through the through part and the limiting hook part is hooked on the core pulling.

This application is through add the wedging piece on the movable mould template, and the wedging piece can stretch into the inside of loosing core along with mould compound die action. Specifically, in a mold closing state, the wedge block penetrates through the through part and the limiting hook part of the wedge block is hooked on the loose core, when the mold is opened, if the oil cylinder does not extract the loose core, namely the loose core is in an extending reset position, the limiting hook part of the wedge block locks the loose core and cannot open the mold, the mold can be opened only if the loose core is extracted, and the condition that the loose core is damaged or even the oil cylinder is damaged due to the fact that the loose core is not extracted and the mold is opened is avoided; when the mold is closed, even if the oil cylinder is in a non-extraction state, when the inclined surface of the limiting hook part of the wedge block contacts the end part of the through part, the inclined surface can toggle the core pulling to drive the core pulling to move in the extraction direction until the core pulling is completely extracted, and the mold collision problem can not occur when the mold is closed continuously.

In some embodiments of the present application, the wedge block has a fixing portion fixed to the movable die plate by a screw.

In some embodiments of the present application, the movable die plate is formed with a positioning groove adapted to the fixing portion, and the fixing portion is embedded in the positioning groove.

In some embodiments of the present application, the slope angle is 15 ° to 75 °.

In some embodiments of the present application, the core is formed by core-pulling and splicing a plurality of cores sequentially arranged in the core-pulling direction.

In some embodiments of the present application, an axial direction of the through portion is parallel to a mold opening and closing direction, and a portion of the wedge block located in the through portion is a linear cylinder, and an extending direction of the linear cylinder is parallel to the axial direction of the through portion.

In some embodiments of the application, the limiting hook part is hooked on the loose core, and the limiting hook part is perpendicular to the direction of the opening and closing mold and the contact surface of the loose core.

In some embodiments of this application, be formed with on the cover half template and be used for dodging spacing groove of dodging of colluding the portion, spacing colluding the portion and colluding when loosing core, spacing portion of colluding is located dodge the inslot.

In some embodiments of the application, the loose core is connected with a driving shaft of the oil cylinder through a connecting block.

In some embodiments of the present application, a guide hole is formed in the fixed die plate, and the loose core is slidably guided and fitted to the guide hole.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a view of a product with a back-off hole;

FIG. 2 is a schematic structural view of a prior art injection mold in a state that a core is not extracted before opening the mold;

FIG. 3 is a schematic structural view of a prior art injection mold in a state before closing the mold and before withdrawing the core back;

FIG. 4 is a schematic structural view of the injection mold in a state that the core is not extracted before the mold is opened;

FIG. 5 is a schematic structural view of the injection mold in a state of cylinder action and core pulling out before mold opening;

FIG. 6 is a structural diagram of the injection mold in the mold opening process of the present application;

FIG. 7 is a schematic view of a mold clamping process of the injection mold of the present application;

FIG. 8 is a schematic structural diagram of a second mold closing process of the injection mold of the present application;

FIG. 9 is a schematic diagram of the three structures of the injection mold clamping process of the present application.

Reference numerals in fig. 1 to 3: 1-injection molding of products; 2-a back-off hole; 3, core pulling; 4-oil cylinder; 5-moving the mold; 6-pitched roof; 7-fixing the mold;

reference numerals in fig. 4 to 9: 1-injection molding of products; 2-a back-off hole; 10-fixing the die plate; 11-avoidance grooves; 12-a pilot hole; 20-moving the die plate; 21-a positioning groove; 30-an oil cylinder core pulling mechanism; 31-oil cylinder; 32-core pulling; 32A-sub core pulling; 32B-sub core pulling; 32C-sub core pulling; 33-a through-section; 34-a connecting block; 40-a wedge block; 41-a limit hook part; 42-inclined plane; 43-a fixed part; 50-screw.

Detailed Description

The technical scheme of the utility model is clearly and completely described in the following with reference to the accompanying drawings. In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

Referring to fig. 4 to 9, the injection mold in the present embodiment includes a fixed mold and a movable mold, the fixed mold includes a fixed mold platen 10, the movable mold includes a movable mold platen 20, in order to form the undercut hole 2 on the injection product 1 shown in fig. 1, the fixed mold platen 10 is provided with an oil cylinder core-pulling mechanism 30, which includes an oil cylinder 31 and a core-pulling mechanism 32 driven by the oil cylinder 31; in this embodiment, the movable die plate 20 is fixedly provided with the wedging block 40, the wedging block 40 is fixedly arranged on the movable die plate 20 through the screw 50, the wedging block 40 is provided with a limiting hook part 41 extending to the side of the fixed die plate 10, an inclined surface 42 is formed on one side of the limiting hook part 41, the core pulling 32 is provided with a through part 33 for avoiding the wedging block 40 to pass through, in the core pulling direction, namely the left and right direction shown in fig. 4 to 9, the distance D between the through part 33 and the wedging block 40 is larger than the core pulling distance L of the oil cylinder 31, and the core pulling distance is the distance moved by the core pulling 32 in the pulling direction when the core pulling 32 is pulled from the molding position to the position where the plastic part is not obstructed; during mold closing, the inclined surface 42 contacts with the end of the through part 33 to drive the core back 32 to move towards the extraction direction, as shown in fig. 7 to 9, the extraction direction of the core back 32 is towards the right, namely the core back 32 retracts until the wedge block 40 penetrates into the through part 33, the core back 32 is completely extracted, and at the moment, the condition that the end of the core back 32 and relevant structural components on the movable mold plate 20 are interfered and collided when mold closing is continued does not occur; under the in-place mold closing state, the wedging block 40 penetrates through the through part 33 and the limiting hook part 41 of the wedging block is hooked on the core pulling 32, so that if the oil cylinder 31 does not act at the moment, the mold cannot be opened due to the limiting effect of the limiting hook part 41, and the risk that the core pulling is pulled to be damaged or even the oil cylinder is damaged due to the fact that the mold opening is not pulled out if the core pulling is not carried out is effectively avoided.

Specifically, taking an injection mold with an upper mold platen and a lower mold platen, a fixed mold platen 10 being on top and a movable mold platen 20 being on bottom as an example as shown in fig. 4 to 9, a back-off hole 2 is located at a side portion of an injection product 1, an oil cylinder core pulling mechanism 30 is located at a side portion of the fixed mold platen 10 and is arranged opposite to the back-off hole 2, an oil cylinder 31 is located outside the fixed mold platen 10 and is fixedly connected to the fixed mold platen 10 through an oil cylinder seat, a core pulling 32 extends into the fixed mold platen 10, and the oil cylinder 31 pulls out and resets the core pulling 32 in the left-right direction. Accordingly, the wedge 40 is located at a side portion of the movable die plate 20, which extends upward to a side of the fixed die plate 10. The core 32 is connected to a drive shaft of the cylinder 31 through a connecting block 34.

The principle of the anti-collision die of the injection mold of the embodiment is as follows: when the injection mold is in a state before mold opening (i.e., a mold closing state) and the oil cylinder is not pulled out as shown in fig. 4, the limiting hook part 41 of the wedge block 40 is hooked on the core pulling 32, and at this time, if the oil cylinder 31 does not act, the mold cannot be opened, thereby effectively avoiding the risk that the core pulling 32 is pulled out or even the oil cylinder 31 is damaged due to mold opening if the core pulling 32 is not pulled out; the oil cylinder 31 is actuated, the loose core 32 is pulled out rightwards and separated from the inverted buckle hole 2, as shown in fig. 5, at this time, the wedge block 41 moves to the through part 33 relative to the loose core 32, and due to the avoiding effect of the through part 33, the mold can be opened smoothly, as shown in fig. 6; when the core 32 is in the non-extraction state, i.e. the reset state, during mold closing, as shown in fig. 7, when the inclined surface 42 contacts the bottom end of the through portion 33, the core 32 is driven to move towards the extraction direction (rightward) due to the toggle guiding action of the inclined surface 42, as shown in fig. 8, until the wedge block 41 penetrates into the through portion 33, the core 32 is completely extracted, as shown in fig. 9, and at this time, the condition that the core 32 collides with the mold does not occur when mold closing is continued.

In the present embodiment, as shown in fig. 4 to 9, the wedge block 40 further has a fixing portion 43, and the fixing portion 43 is fixed to the movable die plate 20 by a screw 50. In addition, the positioning groove 21 matched with the fixing part 43 is formed in the movable die plate 20, the fixing part 43 is embedded into the positioning groove 21 and then fixed through the screw 50, on one hand, the fixing and installing efficiency of the wedging block 40 can be improved, on the other hand, the fixing part 43 is embedded into the positioning groove 21, the fixing part 43 can be prevented from protruding out of the movable die plate 20, therefore, the phenomenon that the size of the die is changed due to the fact that the wedging block 40 is additionally arranged is avoided as far as possible, the change of the original die structure is reduced, the overall structure of the die is simple, and the die is easy to achieve.

The inclined angle alpha of the inclined plane 42 is preferably 15-75 degrees, and the inclined plane 42 has moderate resistance to the loose core 32 in the angle range, so that the loose core can smoothly slide into or out of the through part 33 in the mold opening and closing process, and the mold opening and closing can be smoothly carried out.

In this embodiment, the core back 32 is formed by splicing a plurality of sub core backs sequentially arranged in the core back direction, as shown in fig. 4 to 9, the core back 32 includes three sub core backs 32A, 32B, and 32C sequentially connected from left to right, and the specific stroke of the through portion 33 is on the middle sub core back 32B. On the one hand, the mold can be processed simply, on the other hand, the core pulling 32 is large in length and easy to damage, if the core pulling is integrated, the replacement cost is high, the core pulling part damaged by the inlaying mode can be directly replaced, and therefore the mold cost can be reduced.

For an injection mold with upper and lower dies, preferably, the axial direction of the through part 33 is parallel to the die opening and closing direction, which is a vertical through hole in this embodiment, and accordingly, the portion of the wedge block 40 located in the through part 33 is a linear column, and the extending direction thereof is parallel to the axial direction of the through part 33, so as to reduce the stroke of the wedge block 40 and ensure smooth relative movement between the wedge block 40 and the through part 33.

In order to further improve the limiting reliability, in this embodiment, when the limiting hook portion 41 is hooked on the core back 32, the contact surface between the limiting hook portion 41 and the core back 32 is perpendicular to the mold opening and closing direction. As shown in fig. 6 and 7, the surface of the core back 32 contacting the limiting hook portion 41 is a horizontal surface, and similarly, the surface of the limiting hook portion 41 contacting the core back 32 is also a horizontal surface, and the limiting hook portion 41 is specifically an L-shaped hook to be stably hooked on the core back 32.

In addition, an avoiding groove 11 for avoiding the limit hook part 41 is formed on the fixed die plate 10, when the limit hook part 41 is hooked on the loose core 32, the limit hook part 42 is positioned in the avoiding groove 11, so that the limit hook part 41 can be prevented from being exposed outside the fixed die plate 10, the size of the die is prevented from being changed as far as possible due to the fact that the wedge block 40 is additionally arranged, the change of the original die structure is reduced, and the overall die is simple in structure and easy to achieve.

Because the core back 32 is usually longer, in order to avoid the deformation of the cantilever structure caused by the formation of the cantilever structure from affecting the molding quality of the undercut 2, in this embodiment, the guide hole 12 is further formed on the fixed die plate 10, and the core back 32 is in sliding guide fit with the guide hole 12. Specifically, the molding end of the core 32, that is, the end far away from the oil cylinder 31, is in sliding guide fit with the guide hole 12, so that one end of the core 32 is supported by the guide hole 12, and the other end of the core is supported by the oil cylinder 31, thereby avoiding the problem that the core 32 is easy to deform due to a cantilever structure.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims (10)

1. An injection mold comprises a fixed mold template and a movable mold template, wherein an oil cylinder core-pulling mechanism is arranged on the fixed mold template and comprises an oil cylinder and a core-pulling driven by the oil cylinder; the die is characterized in that a wedging block is fixedly arranged on the movable die plate, the wedging block is provided with a limiting hook part extending to the side of the fixed die plate, an inclined surface is formed on one side of the limiting hook part, a through part for avoiding the wedging block to pass through is formed on the core pulling, and in the core pulling direction, the distance between the through part and the wedging block is larger than the core pulling distance of the oil cylinder; when the mold is closed, the inclined surface is in contact with the end part of the through part to drive the core pulling to move in the drawing direction, and in the mold closing state, the wedging block penetrates through the through part and the limiting hook part is hooked on the core pulling.

2. The injection mold of claim 1, wherein the wedge block has a fixing portion fixed to the movable mold plate by a screw.

3. The injection mold as claimed in claim 2, wherein the movable mold plate is formed with a positioning groove fitted to the fixing portion, and the fixing portion is fitted into the positioning groove.

4. An injection mould according to claim 1, characterised in that the angle of inclination of the chamfer is 15 ° -75 °.

5. The injection mold according to claim 1, wherein the core pulling is formed by splicing a plurality of sub-core pulling bodies which are sequentially arranged along the core pulling direction.

6. The injection mold according to claim 1, wherein the through portion has an axial direction parallel to a mold opening and closing direction, and a portion of the wedge block located in the through portion is a linear column having an extension direction parallel to the axial direction of the through portion.

7. The injection mold according to claim 6, wherein when the limiting hook part is hooked on the loose core, a contact surface of the limiting hook part and the loose core is perpendicular to the mold opening and closing direction.

8. The injection mold according to claim 1, wherein an avoiding groove for avoiding the limiting hook part is formed in the fixed mold plate, and when the limiting hook part is hooked on the loose core, the limiting hook part is located in the avoiding groove.

9. An injection mould according to claim 1, characterized in that the core back is connected with a drive shaft of the cylinder through a connecting block.

10. An injection mold according to claim 1, wherein the fixed mold platen is formed with a guide hole, and the core puller is slidably and guide-fitted with the guide hole.

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