CN211616433U

CN211616433U - Injection mold

Info

Publication number: CN211616433U
Application number: CN201922379414.0U
Authority: CN
Inventors: 程强; 宋科明; 余华林; 徐政委; 区桂权
Original assignee: Guangdong Liansu Technology Industrial Co Ltd
Current assignee: WUHAN LIANSU PRECISION DIE Co.,Ltd.
Priority date: 2019-12-25
Filing date: 2019-12-25
Publication date: 2020-10-02
Anticipated expiration: 2029-12-25

Abstract

The utility model relates to a plastics pipe fitting technical field especially relates to an injection mold, including cover half and movable mould, the movable mould includes the bottom plate, be equipped with the core on the bottom plate, the cover half is equipped with the cavity, the movable mould with the cover half closes the back, the core is arranged in the cavity and there is the clearance to form the product die cavity, the core is equipped with the compound post in top, the compound post in top is equipped with the spring, the top of the compound post in top is stretched out the core and is passed through the spring can stretch out and draw back in producing the product die cavity, the cover half is equipped with the runner, and the plastics fuse-element passes through the runner is poured. The utility model discloses a when the mould can effectively guarantee product surface quality, this mould structure also can job stabilization, safe and reliable, use facility.

Description

Injection mold

Technical Field

The utility model relates to a plastics pipe fitting technical field especially relates to an injection mold.

Background

The general injection molding method is that the granular material or powder of polymer components are put into a charging barrel of an injection molding machine, the materials are homogenized and melted to finish the material storage action through the actions of heating, compressing, shearing, mixing and conveying, then a plunger or a screw is used for applying pressure to the melted polymer melt, the high-temperature melt is injected into a pre-closed low-temperature die cavity through a nozzle in the front of the charging barrel and a pouring channel system of the die, and the die is opened through pressure maintaining, cooling and shaping, and the product is ejected, so that the plastic product with certain geometric shape and precision is obtained.

In the injection molding process, when molten materials enter a mold cavity, a serpentine line similar to a curve is formed in the front direction of a fluid, the serpentine line is often formed in a mold with a small sprue and a thick-wall mold cavity, and the molten materials are not directly contacted with the mold wall or caused by obstacles when the mold is filled. On the other hand, after the molten material passes through the gate, the flow is unstable or even injected due to the speed change, some molten materials are rapidly cooled after contacting with the relatively cold surface of the cavity to form a condensed layer, and cannot be tightly combined with the subsequent molten material in the mold filling process, and even the subsequent material cannot be filled up by pressure maintaining, so that the defects such as gate marks appear on the outer layer, and the defects can be partially or completely hidden in the product.

Therefore, the spray lines not only have obvious surface defects, but also are accompanied by structural nonuniformity, frozen tension and residual stress exist in the product, and the factors influence the product quality; aiming at products with thicker wall thickness, small gate and poorer flowability of the plastic, in order to ensure the requirements of the quality of the inner surface and the outer surface of the product, complex process parameters are usually needed for adjustment, the adjustment range of the process parameters is narrower, and the product quality is unstable.

As mentioned above, in order to solve the problem, the appearance and inner wall of the plastic product are required to be glossy and have no flow marks when the plastic product is injection molded, and a relatively complicated process is often required to adjust the appearance and inner surface quality of the product, but in most cases, the improvement is unlikely to be achieved by adjusting the molding parameters. In addition, the unilateral change of the process inevitably causes the fluctuation and the change of other factors, and is an insufficient solution; the product problem needs to be comprehensively solved from the aspects of product structure, mold design, materials, process and the like. Therefore, the design is designed aiming at the traditional pipe cap mold, namely a mold with a cavity with a smaller sprue and a thicker wall thickness, and the problem of the flow pattern of the existing product is solved on the basis of not changing the structure and the material of the product by starting from the mold design and combining the process, so that the product yield can be improved at the lowest cost.

SUMMERY OF THE UTILITY MODEL

For solving the technical defect who exists, the utility model provides an injection mold of compound post in embedded top in area when can effectively guarantee product surface quality, this mould structure also can job stabilization, safe and reliable, convenient to use.

The technical scheme of the utility model is that; the utility model provides an injection mold, includes cover half and movable mould, the movable mould includes the bottom plate, be equipped with the core on the bottom plate, the cover half is equipped with the cavity, the movable mould with the cover half back of closing, the core is arranged in the cavity and there is the clearance to form the product die cavity, the core is equipped with the compound post in top, the compound post in top is equipped with the spring, the top of the compound post in top stretches out the core and passes through the spring can stretch out and draw back in producing the die cavity, the cover half is equipped with the runner, and the plastics fuse-element passes through the runner is poured into the.

The novel design of the mold structure is an embedded type jacking column, the jacking column can slowly and stably return to the middle of a mold core along with the rise of melt pressure in the injection process, and the distance of a product cavity is shortened, so that the pouring flowing mode in the injection process is changed. After the molten material enters the sprue, the molten material can quickly contact a product cavity and uniformly diffuse around, so that the appearance defect of the product can be obviously improved.

Further, the bottom plate includes movable mould bedplate, layer board, push pedal, the layer board passes through the screw fixation and is in on the movable mould bedplate, the push pedal passes through the screw fixation and is in on the layer board, the layer board with the centre of push pedal all is equipped with the through-hole, the core passes through the screw fixation and is in proper order passed on the movable mould bedplate the layer board with the through-hole of push pedal stretches out, accomplishes the movable mould installation through above structure.

Further, the core is provided with an inner cavity, the jacking column is fixed in the inner cavity of the core, and the top end of the jacking column extends out of the top of the core.

Further, the bottom plate is provided with a pull rod screw, the pull rod screw extends into the inner cavity of the mold core from the bottom of the movable mold base plate and is fixedly connected with the ejection composite column, and the spring is sleeved on a screw rod of the pull rod screw extending into the inner cavity of the mold core.

Furthermore, the bottom of the top-recovery column is provided with a convex mounting hole, the convex end of the convex mounting hole is provided with an internal thread, and the threaded end of the pull rod screw extends into the convex end of the convex mounting hole to be in threaded connection with the top-recovery column.

Furthermore, part of screw rods of the pull rod screws extend into the non-protruding ends of the convex mounting holes, one ends of the springs are abutted to the inner side edges of the non-protruding ends of the convex mounting holes, the other ends of the springs are abutted to the upper surface of the movable mold base plate, so that the jack-up columns can extend and retract through the springs in the inner cavities of the cores, and further the top ends of the jack-up columns can extend and retract in the product cavities.

Set up protruding type mounting hole in the compound post of top inside and be used for installing pull rod screw and spring, utilize simple structure can realize making the compound post of top freely stretch out and draw back at the inner chamber of core, and then make the compound post of top stretch out the top of core and stretch out and draw back in the product die cavity, realize along with the rising of injection in-process fuse-element pressure slowly and steadily return to the core in the middle of, thereby the top of the compound post of top has shortened the product die cavity distance and has changed the in-process pouring flow mode of moulding plastics.

Further, the mold core with the clearance size between the through-hole of layer board, push pedal is 2-3 um.

Further, the top of inner chamber is equipped with the perforation, the top of the compound post in top passes through the perforation stretches out to the product die cavity, the top of the compound post in top with clearance size between the perforation is 2-3 um.

The gaps generated by the embedding and penetrating of the parts in the die are all 2-3 um, because the injection molding commonly used material is HDPE (high density polyethylene), the melt viscosity of the HDPE is high, the flow length ratio is small, the HDPE is used for thin-wall products, and the monomolecular diameter of the generated melt is about 50um, so the phenomenon of melt leakage cannot be generated in the gaps between the die parts.

Furthermore, the sprue is provided with a sprue sleeve, so that the nozzle of the charging barrel can conveniently position the melt when injecting the melt into the sprue, and the melt can be accurately injected into a product cavity.

Further, the fixed die is provided with a convex opening, the movable die is provided with a groove, and the fixed die is tightly closed with the groove of the movable die through the convex opening. The groove arranged on the movable mold plays a role in auxiliary guiding, so that the fixed mold is tightly attached to the movable mold through the convex opening, and a product cavity formed by the fixed mold is good in sealing performance and seamless.

The utility model has the advantages that;

the design adds an embedded ejection column on the traditional pipe cap mould moving mould core, and the ejection column can slowly and stably return to the core along with the rise of melt pressure in the injection process. The injection molding device has the effects that the distance of a product cavity is shortened, so that the pouring flow mode in the injection molding process is changed, a molten material can quickly contact the product cavity and uniformly diffuse around after entering a sprue, the fusion condition of a plastic melt which is firstly injected into the cavity and then enters the melt can be obviously improved, no flow pattern is generated, and the appearance quality of a product is obviously improved.

Drawings

Fig. 1 is a structural sectional view of the present invention.

Detailed Description

The drawings are for illustrative purposes only and are not to be construed as limiting the patent; for the purpose of better illustrating the embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted. The positional relationships depicted in the drawings are for illustrative purposes only and are not to be construed as limiting the present patent.

Example 1:

as shown in fig. 1, the injection mold comprises a fixed mold and a movable mold, wherein the movable mold comprises a bottom plate, a mold core 1 is arranged on the bottom plate, the fixed mold is provided with a cavity, after the movable mold and the fixed mold are closed, the mold core 1 is arranged in the cavity and has a gap to form a product cavity 2, the bottom plate comprises a movable mold base plate 6, a supporting plate 7 and a pushing plate 8, the supporting plate 7 is fixed on the movable mold base plate 6 through screws, the pushing plate 8 is fixed on the supporting plate 7 through screws, through holes are formed between the supporting plate 7 and the pushing plate 8, the mold core 1 is fixed on the movable mold base plate 6 through screws and sequentially penetrates through the through holes of the supporting plate 7 and the pushing plate 8 to extend out, the mold core 1 is provided with an inner cavity 9, a jack-up column 3 is fixed in the inner cavity 9, the jack-, the drawing rod screw 10 extends into the inner cavity 9 of the mold core 1 from the bottom of the movable mold base plate 6 and is fixedly connected with the bottom of the ejection and recovery column 3, the spring 4 is sleeved on a screw rod of the drawing rod screw 10 extending into the inner cavity 9 of the mold core 1, the top end of the ejection and recovery column 3 extends out of the mold core 1 and can stretch in the product cavity 2 through the spring 4, the fixed mold is provided with a pouring gate 5, and plastic melt is poured into the product cavity 2 through the pouring gate 5.

In this embodiment, the bottom of the jack-up column 3 is provided with a convex mounting hole, the convex end of the convex mounting hole is provided with an internal thread, the threaded end of the pull rod screw 10 extends into the convex end of the convex mounting hole to be in threaded connection with the jack-up column 3, part of the screw rod of the pull rod screw 10 extends into the non-convex end of the convex mounting hole, one end of the spring 4 abuts against the inner side edge of the non-convex end of the convex mounting hole, the other end of the spring 4 abuts against the upper surface of the movable mold base plate, so that the jack-up column 3 can extend and retract through the spring 4 in the inner cavity 9 of the core 1, and further the top end of the jack-up column 3 can extend and retract in the product cavity 2.

Set up protruding type mounting hole in the compound post in top 3 and be used for installing pull rod screw 10 and spring 4, utilize simple structure can realize making compound post in top 3 freely stretch out and draw back in inner chamber 9 of core 1, and then make compound post in top 3 stretch out and draw back in product die cavity 2 on the top of core 1. The reciprocating column 3 slowly and stably retreats into the mold core 1 along with the rise of the melt pressure in the injection process, and the top end of the reciprocating column 3 shortens the distance of the product cavity 2, so that the pouring flowing mode in the injection process is changed.

In this embodiment, the size of the gap between the core 1 and the through holes of the supporting plate 7 and the pushing plate 8 is 2-3 um.

In this embodiment, the top of inner chamber 9 is equipped with the perforation, the top of the compound post in top 3 passes through the perforation stretches out product die cavity 2, the top of the compound post in top 3 with the clearance size between the perforation is 2-3 um.

In this embodiment, the gate 5 is provided with a gate sleeve 11, which facilitates positioning when the nozzle of the charging barrel injects the melt into the gate 5, so that the melt can be accurately injected into the product cavity 2.

In this embodiment, the fixed mold is provided with a convex opening 12, the movable mold is provided with a groove 13, and the fixed mold is tightly closed with the groove 13 of the movable mold through the convex opening 12. The groove 13 arranged on the movable mould plays a role in auxiliary guiding, so that the fixed mould is tightly attached to the movable mould through the convex opening 12, and a product cavity 2 formed by the fixed mould has good sealing performance and no gap.

When the injection molding device is used, the movable mold is firstly installed on a movable mold plate of an injection molding machine, the fixed mold is installed on a fixed mold plate of the injection molding machine, after the installation is completed, the movable mold and the fixed mold are firstly closed, then a nozzle of a charging barrel injects a plastic melt into a product cavity 2 through a sprue 5, due to the action of a spring 4, the top end of a jacking column 3 in the product cavity 2 can slowly and stably return to a mold core 1 along with the rise of the melt pressure in the injection process, the distance of the cavity is shortened due to the existence of the jacking column 3, so that the pouring flowing mode in the injection molding process is changed, after the melt enters the sprue 5, the melt can quickly contact the product cavity 2 and uniformly diffuse to the periphery, the fusion condition of the plastic melt which is injected into the product cavity 2 first and the melt which enters the product cavity later can be obviously improved, and the appearance; after finishing moulding plastics, spring 4 is compressed in core 1 completely, treats that the product cools off the back that finishes, carries out the die sinking, because during the die sinking, cover half and movable mould separation, the cavity of cover half no longer compresses the product, because spring 4's elasticity, the top of compound post 3 of top stretches out gradually, pushes up the product gradually and leaves type core 1, can take out the product fast.

It is obvious that the above embodiments of the present invention are only examples for clearly illustrating the present invention, and are not limitations to the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. The utility model provides an injection mold, its characterized in that, includes cover half and movable mould, the movable mould includes the bottom plate, be equipped with core (1) on the bottom plate, the cover half is equipped with the cavity, the movable mould with the cover half closes the back, core (1) are arranged in the cavity and there is the clearance to form product die cavity (2), core (1) is equipped with a compound post (3), a compound post (3) is equipped with spring (4), core (1) and pass through are stretched out on the top of a compound post (3) spring (4) can stretch out and draw back in product die cavity (2), the cover half is equipped with runner (5), and the plastic melt passes through runner (5) are poured into a mould in the product die cavity (2).

2. An injection mold according to claim 1, characterized in that, the bottom plate comprises a movable mold base plate (6), a supporting plate (7) and a push plate (8), the supporting plate (7) is fixed on the movable mold base plate (6) through screws, the push plate (8) is fixed on the supporting plate (7) through screws, through holes are arranged in the middle of the supporting plate (7) and the push plate (8), and the mold core (1) is fixed on the movable mold base plate (6) through screws and sequentially passes through the through holes of the supporting plate (7) and the push plate (8) to extend.

3. An injection mould according to claim 2, characterised in that the core (1) is provided with an inner cavity (9), the knock-out pin (3) being fixed to the inner cavity (9) of the core (1), the top end of the knock-out pin (3) projecting from the top of the core (1).

4. An injection mould according to claim 3, characterized in that the bottom plate is provided with a draw bar screw (10), the draw bar screw (10) extends from the bottom of the moving die base plate (6) into the inner cavity (9) of the core (1) to be fixedly connected with the jack-up post (3), and the spring (4) is sleeved on a screw rod of the draw bar screw (10) extending into the inner cavity (9) of the core (1).

5. An injection mould as claimed in claim 4, wherein the bottom of the reciprocating ram (3) is provided with a male mounting hole, the male end of the male mounting hole is provided with internal threads, and the threaded end of the draw rod screw (10) extends into the male end of the male mounting hole to be in threaded connection with the reciprocating ram (3).

6. An injection mould as claimed in claim 5, wherein a part of the screw rod of the draw rod screw (10) extends into the non-protruding end of the convex mounting hole, one end of the spring (4) abuts against the inner side edge of the non-protruding end of the convex mounting hole, and the other end of the spring (4) abuts against the upper surface of the movable mould base plate (6), so that the jack-up column (3) can be extended and retracted in the inner cavity (9) of the core (1) through the spring (4), and the top end of the jack-up column (3) can be extended and retracted in the product cavity (2).

7. An injection mould according to claim 2, characterised in that the size of the gap between the core (1) and the through-holes of the carrier plate (7) and the push plate (8) is 2-3 um.

8. An injection mould according to claim 3, characterized in that the top of the inner cavity (9) is provided with a through hole, the top end of the reciprocating top column (3) extends out to the product cavity (2) through the through hole, and the size of the gap between the top end of the reciprocating top column (3) and the through hole is 2-3 um.

9. An injection mould according to claim 1, characterised in that the sprue (5) is provided with a sprue bush (11).

10. An injection mould according to claim 1, characterized in that the stationary mould is provided with a protrusion (12) and the movable mould is provided with a recess (13), the stationary mould being arranged to close with the recess of the movable mould via the protrusion.