CN108115889A - A kind of injection mold release mold - Google Patents

Abstract

The invention discloses an injection molding demolding mold which comprises an upper mold, a lower mold, a mold core and a thimble, wherein the mold core and the thimble are arranged between the upper mold and the lower mold; a primary demolding part is arranged between the mold core and the lower mold; a thimble positioning part is arranged on the lower die, and a secondary demoulding part is arranged between the thimble positioning part and the die core; an injection molding cavity for a thimble to penetrate through is formed in the mold core, and a clamping piece matched with the workpiece is arranged on the thimble; when the demolding operation is carried out, the primary demolding part drives the clamping piece to be separated from the workpiece firstly, and then the secondary demolding part drives the workpiece to be separated from the injection molding cavity. The invention is provided with the primary demoulding part and the secondary demoulding part, thereby realizing the step-by-step demoulding treatment of the workpiece, and because the workpiece adopts the secondary demoulding operation, the pulling force, the acting force and the like received between the mould and the workpiece are small during each demoulding, the forming integrity of the workpiece is high, and the damage rate of the mould is low.

Description

A kind of injection mold release mold

technical field

The invention belongs to the technical field of injection molding, and in particular relates to an injection molding demoulding mold.

Background technique

Injection mold is a mold used for injection molding of plastic parts. When a hollow post needs to be formed on the workpiece to be injected, it needs to be formed at the same time as injection molding. The traditional injection molding method is to set a thimble on the injection mold, and set a convex part on the thimble. During injection molding, the plastic covers the convex part, and a hollow convex post can be formed after demoulding. However, when the mold with this structure is demolded, the convex portion on the thimble is prone to bending or breaking, and the service life of the injection mold is short. Moreover, the frictional force between the thimble and the injection molding cavity is relatively large, and the resistance received during demoulding is relatively large, and the demoulding is not smooth enough.

Contents of the invention

In order to overcome the deficiencies of the prior art, the invention provides an injection molding demoulding mold with long service life and smooth demoulding.

In order to achieve the above object, the present invention adopts the following technical solutions: an injection mold release mold, including an upper mold, a lower mold with a core and a thimble between the upper and lower molds; A primary demoulding part is provided; a thimble positioning part is provided on the lower mold, and a secondary demoulding part is provided between the thimble positioning part and the core; an injection molding hole for the thimble to pass is provided on the core Cavity, the thimble is provided with a clip that matches the workpiece; an auxiliary structure for reducing the friction between the thimble and the inner wall of the injection cavity is provided; when the demoulding operation is performed, The primary demoulding component first drives the clip to disengage from the workpiece, and then the secondary demoulding component drives the workpiece to disengage from the injection molding cavity. The invention sets primary and secondary demoulding parts, so that the workpiece can be demoulded step by step. When demoulding for the first time, the clamp is controlled to separate from the workpiece first, and then the workpiece is controlled to separate from the injection cavity. The clamp and the workpiece are separated. When the workpiece is demolded, the workpiece remains stationary, while the thimble moves vertically to ensure that the clamp is separated from the workpiece vertically; compared with the traditional situation of moving the workpiece to achieve demoulding, the clamp is less prone to bending or breaking , not easy to damage, long service life; and because the workpiece adopts the secondary demoulding operation, the pulling force and force received between the mold and the workpiece are small every time the mold is demoulded, the workpiece has a high degree of integrity and the mold damage rate Low; the setting of the auxiliary structure effectively reduces the friction between the thimble and the injection cavity, so that when the workpiece is lifted, it is smoother and faster, and the demoulding effect is good.

Further, the primary demoulding part includes a mold foot, a demoulding column, an active cavity arranged on the core and matched with the demoulding column, a demoulding cavity provided on the mold foot, and a mold located in the demoulding cavity The elastic part; the lower part of the demoulding column is connected with the lower mold, and the upper part of the demoulding column is installed in the movable cavity; when demolding for the first time, the lower mold moves downward relative to the core, and the mold The feet move in the movable cavity to keep the core in a stationary position. At this time, the thimble moves down together with the lower mold, so that the clip at the end of the thimble is disengaged from the workpiece, and the contact between the thimble and the workpiece is realized. demoulding.

Further, the elastic member is sleeved on the outside of the demoulding column, one end of the elastic member acts on the core, and the other end acts on the bottom wall of the demoulding cavity; the elastic member can In the process, always give the core an upward support force to prevent the core from moving down with the lower mold.

Further, the mold foot is provided with a through groove matching with the demoulding column, and the upper part of the demoulding column is provided with a first anti-off part matching with the movable cavity, and the lower part is provided with a second anti-off part. The die foot is provided with an accommodating groove matched with the second anti-off piece, the accommodating groove communicates with the through groove, and the second anti-off piece is embedded in the accommodating groove.

Further, the thimble positioning part includes a first positioning plate arranged on the lower mold and a second positioning plate detachably connected with the first positioning plate, and the gap between the first positioning plate and the core is A support column is provided; the support and positioning of the core is realized through the support column.

Further, the secondary demoulding part includes an open slot provided on the second positioning plate for the thimble to pass through, a through hole provided on the first positioning plate for the thimble to pass through, and a The elastic expansion part in the opening groove and the limit part provided at the lower part of the thimble to match the lower mold; during the downward movement of the lower mold, the elastic expansion part continues to exert a downward supporting force on the second positioning plate, Further improve the support and positioning of the core, prevent the core from moving when the lower mold moves, and ensure rapid demoulding between the thimble and the workpiece; The mold column will start to drive the core to move downward. When the core and the positioning part move to conflict with the ejector pin, the ejector pin will lift up the second positioning plate, and the second positioning plate will drive the first positioning plate and the support column upward. Move, so that the upper part of the supporting column will protrude to the upper surface of the core, and then the workpiece will be lifted from the core, so that the workpiece and the injection cavity will be disengaged, and the secondary demoulding will be realized; due to the setting of the elastic expansion part, the When the ejector rod lifts the positioning part, the elastic expansion part can also give the positioning part an upward force, so that the lifting of the positioning part is smoother and the demoulding is smoother.

Further, the lower part of the support column is provided with an anti-off part that cooperates with the first positioning plate; through the cooperation of the anti-off part, it is ensured that the support column and the first positioning plate can move synchronously. , the support column will not come out of the first positioning plate.

Further, a ejector pin is provided under the lower die.

Further, the actuating structure includes a plurality of ball chambers arranged on the thimble and balls arranged in the ball chambers, and the balls partly protrude to the outer wall of the thimble; through the arrangement of the balls, the The contact area between the support column and the injection cavity is greatly reduced, thereby reducing the friction between the two. When the support column moves up the core, the ball will roll, further reducing the gap between the two. The friction force increases the speed of demoulding.

Further, the clip is detachably connected to the thimble through the connection structure; through the detachable connection between the clip and the thimble, when the clip is bent or broken, the clip can be replaced separately, extending The overall service life of the equipment.

Further, the connecting structure includes a connecting sleeve fixedly connected with the clip, an internal thread provided on the inner wall of the connecting sleeve, and an external thread provided on the upper outer wall of the thimble; the structure is simple through the screw connection, It is easy to disassemble and easy to maintain and operate.

In summary, the present invention has the following advantages: the primary and secondary demoulding parts are set, so that the workpiece can be demoulded step by step. Since the workpiece adopts the secondary demoulding operation, the distance between the mold and the workpiece The pulling force and action force received between them are small, the workpiece has a high degree of integrity, and the mold damage rate is low; the setting of the auxiliary structure can effectively reduce the friction between the thimble and the injection cavity, so that the workpiece can be lifted It is smoother and faster, and the demoulding effect is better.

Description of drawings

Fig. 1 is a structural schematic diagram of the present invention.

Fig. 2 is a partial schematic view of the thimble in the present invention.

Detailed ways

In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention.

As shown in Figure 1-2, a kind of injection molding demoulding mold comprises upper mold 1, lower mold 2, core 3 and thimble 4 that are located between upper and lower mold; Described core 3 and described lower mold 2 is provided with a primary demoulding part; the lower mold 2 is provided with a thimble positioning part 5, and a secondary demoulding part is provided between the thimble positioning part 5 and the core 3; specifically, the mold The core 3 is provided with an injection cavity 31 for the thimble to pass through, and the thimble 4 is provided with a clip 41 that matches the workpiece, and the clip 41 is detachably connected to the thimble 4 through a connection structure; the connection structure It includes a connecting sleeve 42 fixedly connected with the clip 41, an internal thread on the inner wall of the connecting sleeve 42 and an external thread on the upper outer wall of the thimble 4. The lower part of the connecting sleeve is set on the opening; through the cooperation of the internal and external threads , realize the screw connection between the clip and the thimble, and facilitate the replacement of the clip; when the demoulding operation is performed, the primary demoulding part first drives the clip 41 to separate from the workpiece, and then the secondary demoulding part drives The workpiece is separated from the injection molding cavity 31; through such a secondary demoulding operation, bending or breaking of the clip during the demoulding process is avoided.

Specifically, the primary demoulding part includes a mold foot 61, a demoulding column 62, a movable cavity 63, a demoulding cavity 64, and an elastic member 65. The mold foot 61 is arranged between the core and the lower mold, and the demoulding The mold column 62 is set in the mold foot 61, the movable cavity 63 is arranged on the core to match the demoulding column, and the mold foot 61 is provided with a through groove matched with the demoulding column, The upper end of the demoulding column penetrates into the movable cavity 63 after passing through the through groove, and the lower part of the demoulding column 62 is connected with the lower mold 2; further, the upper part of the demoulding column 62 is provided with a The first anti-off part 621, the bottom is provided with the second anti-off part 622, and the first anti-off part 621 and the second anti-off part 622 are respectively the flanges formed by the outer wall of the demoulding post 62 extending outward directly; Die cavity 64 demoulding cavity 64, described elastic member 65 is a spring, and this elastic member is located in the demoulding cavity, and elastic member 65 is sleeved outside described demoulding column 62, and this elastic member 65 one end acts on described On the core 3, the other end acts on the bottom wall of the demoulding cavity 64; as preferably, the mold foot 61 is provided with a receiving groove that matches the second anti-escape piece 622, and the receiving groove is compatible with the The through grooves communicate with each other, and the second detachment preventing member 622 is embedded in the receiving groove.

The thimble positioning part 5 includes a first positioning plate 51 and a second positioning plate 52, and the first positioning plate 51 and the second positioning plate 52 are both arranged on the lower mold, and the first positioning plate and the second positioning plate The plates 52 are detachably connected together by screws, and a support column 7 is provided between the first positioning plate 51 and the core 3; A piece 82 and a stopper 83; the opening slot 81 is provided on the second positioning plate 52 for the passage of the thimble, and the elastic telescopic piece 82 is a spring, and the elastic telescopic piece 82 is arranged on the In the opening groove 81, one end of the elastic expansion member 82 acts on the fixed wall of the opening groove, and the other end acts on the lower die; the through hole is arranged on the first positioning plate 51 for the passage of the thimble; The limiting part 83 is arranged at the lower part of the thimble and forms a flange directly extending outward from the side wall of the lower part of the thimble. The limiting part can cooperate with the lower mold to prevent the thimble from moving upwards and disengage from the lower mold;

As a preference, the lower part of the support column 7 is provided with an anti-off part 71 matched with the first positioning plate. The part 71 is embedded in the first positioning plate; further, a ejector pin 9 is provided under the lower mold 2, and the ejector pin is the ejector pin of the injection molding machine, which will not be described in detail in the prior art; other parts of the injection mold The structures are all achievable by the prior art, and will not be described in detail here.

In order to reduce the frictional force between the thimble 4 and the inner wall of the injection cavity 31, an auxiliary structure is provided between the thimble 4 and the inner wall of the injection cavity 31; A ball chamber 101 and a ball 102 located in the ball chamber, the ball 102 is made of stainless steel, the opening of the ball chamber 101 is located on the side wall of the thimble, and the size of the opening is smaller than the diameter of the ball, thereby ensuring that the ball part protrudes To the outer wall of the thimble 4, but will not fall out; further, the top of the thimble can be provided with a through groove to communicate with the ball chamber, and the ball can be dropped into the ball chamber through the through groove.

Apparently, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

Claims (9)

1. An injection molding demoulding mold, comprising an upper mold (1), a lower mold (2), a core (3) and a thimble (4) located between the upper and lower molds; the core (3) and A primary demoulding part is provided between the lower dies (2); a thimble positioning part (5) is provided on the lower die (2), and an ejector pin positioning part (5) is provided between the thimble positioning part (5) and the core (3). There is a secondary demoulding part; the core (3) is provided with an injection cavity (31) for the thimble to pass through, and the thimble (4) is provided with a clip (41) that matches the workpiece; the An auxiliary structure is provided between the thimble (4) and the inner wall of the injection cavity (31) to reduce the friction between the two; when the demoulding operation is performed, the primary demoulding part first drives the card The piece (41) is separated from the workpiece, and then the secondary demoulding component drives the workpiece to separate from the injection cavity (31). 2. The demoulding mold for injection molding according to claim 1, characterized in that: the primary demoulding part includes a mold foot (61), a demoulding post (62), which is arranged on the core to cooperate with the demoulding post The movable cavity (63), the demoulding cavity (64) located on the mold foot and the elastic member (65) located in the demoulding cavity; the lower part of the demoulding column (62) and the lower mold (2 ) are connected, and the upper part of the demoulding column is pierced in the movable cavity (63). 3. The injection molding demoulding mold according to claim 2, characterized in that: the elastic member (65) is sheathed outside the demoulding column (62), and one end of the elastic member (65) acts on the mold core (3), and the other end acts on the bottom wall of the stripping cavity (64). 4. The demoulding mold for injection molding according to claim 2, characterized in that: the mold foot (61) is provided with a through groove matching the demoulding column, and the upper part of the demoulding post (62) is provided with The first anti-off piece (621) matched with the movable cavity has a second anti-off piece (622) on the lower part; the mold foot (61) is provided with the second anti-off piece (622) A matching accommodating groove, the accommodating groove communicates with the through groove, and the second detachment preventing piece (622) is embedded in the accommodating groove. 5. The injection mold release mold according to claim 1, characterized in that: the ejector pin positioning part (5) includes a first positioning plate (51) arranged on the lower mold and can be connected with the first positioning plate The connected second positioning plate (52) is disassembled, and a support column (7) is provided between the first positioning plate (51) and the core (3). 6. The injection molding demoulding mold according to claim 5, characterized in that: the secondary demoulding part includes an open slot (81) provided on the second positioning plate (52) for the thimble to pass through 1. The through hole provided on the first positioning plate (51) for the thimble to pass through, the elastic expansion piece (82) provided in the opening groove, and the limiter provided at the lower part of the thimble to match the lower mold. Bit Department (83). 7. The demoulding mold for injection molding according to claim 6, characterized in that: the lower part of the support column (7) is provided with a detachment prevention part (71) that cooperates with the first positioning plate. 8. The demolding mold for injection molding according to claim 1, characterized in that: a ejector pin (9) is provided under the lower mold (2). 9. The injection mold release mold according to claim 1, characterized in that: the auxiliary structure includes a plurality of ball cavities (101) arranged on the ejector pin and balls (102) arranged in the ball cavities , the ball (102) partially protrudes to the outer wall of the thimble (4).