CN116141586A - Injection mold and injection method thereof - Google Patents

Abstract

The invention discloses an injection mold and an injection molding method thereof, wherein the injection mold comprises a movable mold and a fixed mold covered on the movable mold, the movable mold and the fixed mold can be switched between a mold opening position deviating from each other and a mold closing position attaching to each other, and the injection mold further comprises a central plate arranged between the movable mold and the fixed mold, the central plate is suitable for being fixedly connected with a connecting rod of an injection molding machine and is configured to be capable of moving along the axial expansion and the circumferential direction; the fixed die comprises a fixed die and a movable die, wherein a plurality of first half die cavities are formed in the circumferential direction of the movable die, a plurality of second half die cavities corresponding to the first half die cavities one by one are formed in the circumferential direction of the fixed die, the first half die cavities and the second half die cavities jointly define a die cavity, the shape of each die cavity is the same, and the volume size of each die cavity is sequentially increased in the circumferential direction.

Description

Injection mold and injection method thereof

technical field

The invention relates to the field of molds, in particular to an injection mold and an injection molding method thereof.

Background technique

Most of the existing injection molds are one-time injection molded parts, but this kind of injection mold has the following disadvantages: thick-walled injection molding is difficult to solve by changing the process, because ordinary plastics have shrinkage force, which is difficult to avoid. It is easy to produce dents, shrinkage marks, internal air bubbles, internal voids, and other appearance problems. The shrinkage problem of plastic parts (surface shrinkage and internal shrinkage cavity) is caused by insufficient melt glue replenishment when the thicker part is cooled. We often encounter the situation that the shrinkage problem cannot be solved no matter how the pressure is increased, the water inlet is increased, and the injection time is prolonged. Therefore, there is an urgent need for a method that can solve the appearance problems such as dents, shrinkage marks, internal air bubbles, and internal cavities produced by the existing disposable injection molding, and can also solve the problem of long cooling time.

Contents of the invention

In response to the problems and demands raised above, this solution proposes an injection mold and its injection molding method, which can achieve the above technical objectives and bring many other technical effects due to the adoption of the following technical features.

An object of the present invention is to provide an injection mold, including a movable mold and a fixed mold with a cover on the movable mold, and the movable mold and the fixed mold can be in a mold opening position away from each other and a closed mold attached to each other. switching motion between die positions,

It also includes a central plate arranged between the movable mold and the fixed mold, the central plate is suitable for fixed connection with the connecting rod of the injection molding machine, and is configured to be able to move telescopically along the axial direction and to rotate in the circumferential direction ;

Wherein, a plurality of first half-mold cavities are opened along the circumferential direction of the movable mold, and a plurality of first half-mold cavities corresponding to the first half-mold cavities are opened along the circumferential direction of the fixed mold. The second half-mold cavity, the first half-mold cavity and the second half-mold cavity jointly define a mold cavity, and each of the mold cavities has the same shape, and its volume increases sequentially along the circumferential direction.

In addition, according to the injection mold of the present invention, it can also have the following technical features:

In an example of the present invention, a through hole matching the lateral profile of the mold cavity is opened on the central plate, and a flow channel communicating with the through hole is extended thereon.

In an example of the present invention, the injection mold also includes:

a rotating core mounting plate, the rotating core mounting plate is fixedly connected in the mounting hole and fixedly connected with the connecting rod;

Wherein, a mounting hole is penetratingly opened on the center plate at a position corresponding to the connecting rod.

In an example of the present invention, a through hole is provided on the movable mold, the through hole is arranged coaxially with the installation hole, and the inner diameter of the through hole is larger than the outer diameter of the connecting rod.

In an example of the present invention, the inner diameter of the installation hole is larger than the outer diameter of the connecting rod.

In an example of the present invention, the rotating core mounting plate includes a main body part and an extension part along a radial direction away from the main body part along the outer side wall of the main body part; The mounting hole corresponding to the rotating core mounting plate includes: a first hole portion and a second hole portion connected in sequence, and the first hole portion is adapted to the main body portion, and the second hole portion is connected to the extension The parts are suitable.

In one example of the invention,

The rotating core mounting plate is connected with the central plate through fasteners;

A plurality of first positioning holes are opened on the rotating core mounting plate;

A plurality of second positioning holes corresponding to the first positioning holes are opened on the central plate;

The fastener passes through the first positioning hole and the second positioning hole in sequence.

In one example of the invention,

The rotating core mounting plate and the connecting rod are connected by threads;

There are threaded holes on the mounting plate of the rotating core;

The outer peripheral wall of the connecting rod is provided with an external thread matched with the threaded hole.

In one example of the invention,

A positioning hole is opened along the axial direction of the threaded hole;

A protrusion matching the positioning hole is formed along the axial direction of the connecting rod.

In an example of the present invention, the positioning hole is arranged coaxially with the protrusion.

In an example of the present invention, a sealing ring is further arranged in the positioning hole, configured to seal the gap between the protrusion and the positioning hole.

Another object of the present invention is to propose a method for injection molding of the injection mold as described above, comprising the steps of:

S10: Adjust the movable mold and the fixed mold to the closed mold position and perform injection molding into the first cavity of the injection mold to form a one-off product;

S20: Adjust the movable mold and the fixed mold from the closed mold position to the mold open position, lift the center plate to separate the center plate from the movable mold, and then rotate the center plate to rotate the product synchronously to the second cavity;

S30: Lower the center plate so that the center plate fits the movable mold, then adjust the movable mold and the fixed mold from the mold opening position to the mold closing position, and inject the primary product in the second cavity of the injection mold to form a second mold. Secondary products;

S40: repeating S10 to S30 to perform multiple injection moldings to form multiple-type products until the injection molding products are completed.

Hereinafter, the best embodiments for implementing the present invention will be described in more detail with reference to the accompanying drawings, so that the features and advantages of the present invention can be easily understood.

Description of drawings

In order to illustrate the technical solutions of the embodiments of the present invention more clearly, the accompanying drawings of the embodiments of the present invention will be briefly introduced below. Wherein, the drawings are only used to show some embodiments of the present invention, but not to limit all embodiments of the present invention thereto.

Fig. 1 is a schematic structural view of an injection mold according to an embodiment of the present invention;

Fig. 2 is a structural schematic diagram of the connection between the injection mold and the connecting rod according to an embodiment of the present invention;

Fig. 3 is a flowchart of an injection molding method for an injection mold according to an embodiment of the present invention.

List of reference signs:

Injection mold 100;

Moving model 110;

the first mold cavity 111;

through hole 112;

center plate 120;

Mounting hole 121;

the first hole portion 1211;

the second hole portion 1212;

Through hole 122;

Runner 123;

connecting rod 130;

raised 131;

Rotating core mounting plate 140;

main body 141;

Extension 142;

threaded hole 143;

Adapter hole 144;

fixed mold 150;

the second mold cavity 151;

Cavity M.

Detailed ways

In order to make the purpose, technical solution and advantages of the technical solution of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings of specific embodiments of the present invention. The same reference numerals in the figures represent the same parts. It should be noted that the described embodiments are some of the embodiments of the present invention, but not all of the embodiments. Based on the described embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

Unless otherwise defined, the technical terms or scientific terms used herein shall have the usual meanings understood by those skilled in the art to which the present invention belongs. "First", "second" and similar words used in the patent application specification and claims of the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. Likewise, "a" or "a" and the like do not necessarily imply a numerical limitation. "Comprising" or "comprising" and similar words mean that the elements or items appearing before the word include the elements or items listed after the word and their equivalents, without excluding other elements or items. Words such as "connected" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "Down", "Left", "Right" and so on are only used to indicate the relative positional relationship. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

According to a kind of injection mold 100 of the first aspect of the present invention, as shown in Fig. 1, Fig. 2, comprise movable mold 110 and be arranged on described movable mold 110 fixed mold 150, described movable mold 110 and described fixed mold 150 can switch between the open mold position away from each other and the closed mold position close to each other,

It also includes a central plate 120 arranged between the movable mold 110 and the fixed mold 150, the central plate 120 is adapted to be fixedly connected with the connecting rod 130 of the injection molding machine, configured to be able to move along the axial telescopic direction and Rotational movement in the circumferential direction; for example, the injection molding machine drives the connecting rod 130 to rotate through a motor, and the connecting rod 130 itself is a telescopic part and can perform telescopic movement.

Wherein, a plurality of first half-mold cavities 111 are provided along the circumferential direction of the movable mold 110, and a plurality of first half-mold cavities 111 are provided along the circumferential direction of the fixed mold 150. One-to-one correspondence with the second half-mold cavity 151, the first half-mold cavity 111 and the second half-mold cavity 151 jointly define a mold cavity M, and each of the mold cavities M has the same shape, and its volume is along the increasing in the circumferential direction.

Adjust the movable mold 110 and the fixed mold 150 to the closed mold position and inject into the first cavity M of the injection mold 100 to form a one-time product; adjust the movable mold 110 and the fixed mold 150 from the closed mold position to the open mold position, Lifting the central plate 120 separates the central plate 120 from the movable mold, and then rotates the central plate 120 to rotate the product to the second mold cavity M synchronously; lowers the central plate 120 so that the central plate 120 fits the movable mold 110, Then the movable mold 110 and the fixed mold 150 are adjusted from the mold opening position to the mold closing position, and the primary product in the second mold cavity M of the injection mold 100 is injected to form a secondary product; repeated injection molding is performed multiple times to form multiple products. Secondary products until finished injection molding products.

More specifically, the injection molding machine injects into the first cavity M of the injection mold 100. After the one-shot product is formed, the injection mold is opened. At this time, the one-shot product will remain between the center plate 120 and the movable mold 110. One side, then lift the central plate 120 through the connecting rod 130, so that the central plate 120 communicates with the primary product and separates from the movable mold 110, and then rotates the connecting rod 130 so that the primary product is transferred from the first cavity M to the second Mold cavity M is subjected to the second injection molding, and a product is formed after multiple injection moldings.

That is to say, the injection mold 100 forms a product by layer-by-layer stacking or core-injection molding, which can avoid appearance problems such as dents, shrinkage marks, internal bubbles, and internal cavities, and the reliability of this product is higher.

In an example of the present invention, the central plate 120 is provided with a through hole 122 adapted to the lateral profile of the mold cavity M, and the through hole 122 is extended with a flow channel 123 communicating with it;

That is to say, the through hole 122 is an integral part of the mold cavity M. When injection molding is performed in the mold cavity M, the injection molded product will be formed in the through hole 122. Since the center plate 120 is provided with a flow channel 123, the movable mold 110 After the injection molding is completed with the fixed mold 150, the injection molded product will be embedded on the center plate 120, and will expand and rotate together with the center plate 120; preferably, the flow channel 123 includes two, and symmetrical set up. It should be noted that there is an injection port connected to the external injection molding machine on the cavity M, and the injection liquid flows from the injection port through the flow channel into the cavity for injection molding. The runner part is machined and cut to form the final product.

In an example of the present invention, the injection mold 100 further includes:

A rotating core mounting plate 140, the rotating core mounting plate 140 is fixedly connected in the mounting hole 121 and fixedly connected with the connecting rod 130;

Wherein, a mounting hole 121 is penetratingly opened on the center plate 120 at a position corresponding to the connecting rod.

As shown in Figures 1 and 2, when using the injection mold 100, the injection mold 100 is first placed on the injection molding machine so that the connecting rod 130 of the injection molding machine is facing the through hole of the movable mold 110; The rotating core mounting plate 140 is disassembled, and the connecting rod 130 is lifted to pass through the through hole and the mounting hole 121 in sequence and protrude from the central plate 120; then the rotating core mounting plate 140 is fixedly connected to the connecting rod 130, and then lowered The connecting rod 130 makes the rotating core mounting plate 140 fit in the mounting hole 121; finally, the rotating core mounting plate 140 is fixedly connected with the central plate 120, and the central plate 120 is separated from the movable mold 110; The core mounting plate 140 can facilitate the connection between the connecting rod 130 and the center plate 120, and the assembly is simple, eliminating the step of lifting the center plate 120, greatly saving installation time and improving installation efficiency.

In an example of the present invention, the inner diameter of the mounting hole 121 is larger than the outer diameter of the connecting rod 130;

That is to say, in order to further facilitate the connection between the connecting rod 130 and the rotating core mounting plate 140, it is necessary to lift the connecting rod 130 to protrude from the central plate 120, so by making the inner diameter of the mounting hole 121 larger than the connecting rod 130 The size of the outer diameter can facilitate the connecting rod 130 to pass through the installation hole 121 .

In an example of the present invention, the rotating core mounting plate 140 includes a main body portion 141 and an extension portion 142 extending from the outer wall of the main body portion 141 in a direction away from the main body portion 141 along the radial direction; Wherein, the mounting hole 121 corresponding to the rotating core mounting plate 140 includes: a first hole portion 1211 and a second hole portion 1212 connected in sequence, and the first hole portion 1211 is adapted to the main body portion 141 , the second hole portion 1212 is adapted to the extension portion 142;

In other words, the mounting hole 121 is a stepped hole, and the inner diameter of the first hole portion 1211 is smaller than the inner diameter of the second hole portion 1212. Correspondingly, the rotating core mounting plate 140 is also a stepped structure. By designing the stepped structure The mounting holes 121 can facilitate the assembly between the rotor core mounting plate 140 and the center plate 120 .

In an example of the present invention, a through hole 113 is provided on the movable mold 110 , the through hole 113 is coaxially arranged with the installation hole 121 , and the inner diameter of the through hole 113 is larger than that of the connecting rod 130 The outer diameter size;

There is a gap between the through hole 113 and the connecting rod 130. The existence of the through hole 113 can facilitate the connection between the connecting rod 130 and the rotating core mounting plate 140, that is, the connecting rod 130 is penetrated from the through hole 113 to the mounting hole 121 and installed with the rotating core. The plate 140 is fixedly connected.

In one example of the invention,

The rotating core mounting plate 140 is connected to the central plate 120 through fasteners;

The rotating core mounting plate 140 is provided with a plurality of first positioning holes;

The center plate 120 is provided with a plurality of second positioning holes corresponding to the first positioning holes;

The fastener passes through the first positioning hole and the second positioning hole in sequence;

The rotating core mounting plate 140 and the central plate 120 can be connected together more reliably through the above fastener connection, and the disassembly is convenient.

In one example of the invention,

The rotating core mounting plate 140 and the connecting rod 130 are connected by threads;

The rotating core mounting plate 140 is provided with a threaded hole 143;

The outer peripheral wall of the connecting rod 130 is provided with an external thread matched with the threaded hole 143;

The above connection method is simpler, more convenient and more reliable.

In one example of the invention,

An adapter hole 144 is opened along the axial direction of the threaded hole 143;

A protrusion 131 matching the fitting hole 144 is formed along the axial direction of the connecting rod 130;

The centering fit between the connecting rod 130 and the threaded hole 143 can be facilitated by providing the fitting hole 144 and the protrusion 131 .

In an example of the present invention, the fitting hole 144 is arranged coaxially with the protrusion 131;

In an example of the present invention, a sealing ring is further provided in the fitting hole 144 , configured to seal the gap between the protrusion 131 and the fitting hole 144 ;

Since a water-oil pipeline is provided in the connecting rod 130 , the sealing ring can effectively seal the protrusion 131 and the fitting hole 144 .

According to the second aspect of the present invention, a method for injection molding of an injection mold as described above, as shown in Figure 3, includes the following steps:

S10: Adjust the movable mold and the fixed mold to the closed mold position and perform injection molding into the first cavity of the injection mold to form a one-off product;

S20: Adjust the movable mold and the fixed mold from the closed mold position to the mold open position, lift the center plate to separate the center plate from the movable mold, and then rotate the center plate to rotate the product synchronously to the second cavity;

S30: Lower the center plate so that the center plate fits the movable mold, then adjust the movable mold and the fixed mold from the mold opening position to the mold closing position, and inject the primary product in the second cavity of the injection mold to form a second mold. Secondary products;

S40: repeating S10 to S30 to perform multiple injection moldings to form multiple-type products until the injection molding products are completed.

It should be noted that the mold cavity M is jointly defined by the first half cavity 111 and the corresponding second half cavity 151, and each of the mold cavities M has the same shape, and its volume is along the The circumferential direction increases successively, that is, the volume of the first mold cavity M mentioned here is smaller than the volume of the second mold cavity M, and so on.

The injection molding machine injects into the first cavity of the injection mold. After the one-shot product is formed, the injection mold is opened. At this time, the one-shot product will stay on the center plate and one side of the movable mold, and then move it through the connecting rod. The center plate is lifted, so that the center plate connects the primary product and separates from the movable mold, and then rotates the connecting rod to transfer the primary product from the first cavity to the second cavity for the second injection molding. After multiple injections To form a product, the injection molding method forms a product by layer-by-layer stacking or core-injection molding, and the reliability of this product is higher.

The exemplary implementation of the injection mold and its injection molding method proposed by the present invention has been described in detail above with reference to preferred embodiments. However, those skilled in the art can understand that, without departing from the concept of the present invention, the above-mentioned Various variations and modifications can be made in the specific embodiment, and various combinations of various technical features and structures proposed in the present invention can be carried out without exceeding the protection scope of the present invention, which is determined by the appended claims .

Claims (10)

1. An injection mold, comprising a movable mold (110) and a fixed mold (150) covered on the movable mold (110), the movable mold (110) and the fixed mold (150) can be placed on each other The switching movement between the mold opening position facing away from each other and the mold closing position adhering to each other is characterized in that, It also includes a central plate (120) arranged between the movable mold (110) and the fixed mold (150), the central plate (120) is suitable for fixed connection with the connecting rod (130) of the injection molding machine, configured In order to be able to move telescopically along the axial direction and to rotate in the circumferential direction; Wherein, a plurality of first half-mold cavities (111) are opened along the circumferential direction of the movable mold (110), and a plurality of mold half cavities (111) are opened along the circumferential direction of the fixed mold (150). The first half-mold cavity (111) corresponds to the second half-mold cavity (151), and the first half-mold cavity (111) and the second half-mold cavity (151) jointly define a mold cavity (M) , and each of the mold cavities (M) has the same shape, and its volume increases sequentially along the circumferential direction. 2. The injection mold according to claim 1, characterized in that, The central plate (120) is provided with a through hole (122) adapted to the lateral profile of the mold cavity (M), and the through hole (122) is extended with a flow channel (123) communicating with it. ). 3. The injection mold according to claim 1, characterized in that, The injection mold also includes: A rotating core mounting plate (140), the rotating core mounting plate (140) is fixedly connected in the mounting hole (121) and fixedly connected with the connecting rod (130); Wherein, a mounting hole (121) is penetratingly opened on the central plate (120) at a position corresponding to the connecting rod (130). 4. The injection mold according to claim 3, characterized in that, A through hole (113) is provided on the movable mold (110), and the through hole (113) is arranged coaxially with the installation hole (121), and the inner diameter of the through hole (113) is larger than that of the connecting hole (113). The outer diameter of the rod (130). 5. The injection mold according to claim 3, characterized in that, The inner diameter of the mounting hole (121) is larger than the outer diameter of the connecting rod (130). 6. The injection mold according to claim 3, characterized in that, The rotating core mounting plate (140) includes a main body (141) and an extension (142) along the outer wall of the main body (141) in a direction away from the main body (141) along the radial direction. ); wherein, the mounting hole (121) corresponding to the rotating core mounting plate (140) includes: a first hole portion (1211) and a second hole portion (1212) connected in sequence, and the first hole portion (1211) is adapted to the main body portion (141), and the second hole portion (1212) is adapted to the extension portion (142). 7. The injection mold according to claim 3, characterized in that, The rotating core mounting plate (140) is connected to the central plate (120) through fasteners; The rotating core mounting plate (140) is provided with a plurality of first positioning holes; The center plate (120) is provided with a plurality of second positioning holes corresponding to the first positioning holes; The fastener passes through the first positioning hole and the second positioning hole in sequence. 8. The injection mold according to claim 3, characterized in that, The rotating core mounting plate (140) is threadedly connected to the connecting rod (130); The rotating core mounting plate (140) is provided with threaded holes (143); An external thread matching the threaded hole (143) is provided on the outer peripheral wall of the connecting rod (130). 9. The injection mold according to claim 8, characterized in that, An adapter hole (144) is provided along the axial direction of the threaded hole (143); A protrusion (131) matching the fitting hole (144) is formed along the axial direction of the connecting rod (130). 10. An injection molding method of an injection mold according to any one of claims 1 to 9, characterized in that it comprises the steps of: S10: adjusting the movable mold (110) and the fixed mold (150) to the closed mold position and injecting into the first cavity (M) of the injection mold to form a one-time product; S20: Adjust the movable mold (110) and fixed mold (150) from the closed mold position to the mold open position, lift the central plate (120) to separate the central plate (120) from the movable mold (150), and then rotate the central plate (120) make the product rotate to the second mold cavity (M) synchronously with it; S30: Lower the center plate (120) so that the center plate (120) fits the movable mold (110), and then adjust the movable mold (110) and the fixed mold (150) from the mold opening position to the mold closing position, and the injection mold The primary product in the second mold cavity (M) is injected to form a secondary product; S40: repeating S10 to S30 to perform multiple injection moldings to form multiple-type products until the injection molding products are completed.

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