CN219466874U

CN219466874U - Can realize mould structure of superhigh pressure injection molding on ordinary injection molding machine

Info

Publication number: CN219466874U
Application number: CN202320377576.4U
Authority: CN
Inventors: 查鸿达
Original assignee: Individual
Current assignee: Individual
Priority date: 2023-03-03
Filing date: 2023-03-03
Publication date: 2023-08-04
Anticipated expiration: 2033-03-03

Abstract

The utility model discloses a die structure capable of realizing ultra-high pressure injection molding on a common injection molding machine, wherein a fixed die locking frame is used for locking a first die cavity splicing component and a second die cavity splicing component, a right sliding block is provided with holes matched with movable blocks, the number of right inclined blocks is 2, and the right inclined blocks with the number of 2 comprise a first right inclined block and a second right inclined block; the first right inclined block is provided with a groove matched with the movable block, and the groove is used for enabling a part of the movable block to be pushed into the groove by pressure when the movable block is subjected to the pressure in the die cavity; the outer contours of the first die cavity splicing component and the second die cavity splicing component are combined to form an outer contour which is matched with the fixed die locking frame and can be locked by the fixed die locking frame. The utility model can realize the ultra-high pressure injection molding of the optical plastic products on the common injection molding machine, and compared with the condition that the high-end booster injection molding machine is needed to be purchased in the prior art, the cost of the common injection molding machine is 8 to more than 10 times, thereby realizing the reduction of the production cost of the optical plastic products.

Description

Can realize mould structure of superhigh pressure injection molding on ordinary injection molding machine

Technical Field

The utility model relates to the technical field of injection molding machines, in particular to a die structure capable of realizing ultrahigh pressure injection molding on a common injection molding machine.

Background

There are a class of plastic products (generally referred to as optical products) that require ultra-high pressure injection molding in order to ensure dimensional accuracy and reduce warp deformation. A rectangular article as shown in fig. 1. The pressure required for injection molding of conventional plastic articles is 30 mpa (300 kg/cm). The product has extremely high profile requirements and extremely low deformation requirements, and the required injection pressure is 300 mpa (3000 kg/cm), which is not possible on conventional injection molding machines.

Typically requiring expensive high-end booster injection molding machines. Since these high-end booster injection molding machines sell more than 8 to 10 times as expensive as conventional injection molding machines, the production cost of the plastic product can be high.

Therefore, there is an urgent need for a mold structure capable of implementing ultra-high pressure injection molding on a general injection molding machine, so as to solve the problem existing in the prior art.

Disclosure of Invention

The utility model aims to overcome the defects of the prior art and provides a technical scheme capable of solving the problems.

The die structure comprises a first die cavity splicing component, a second die cavity splicing component and a fixed die locking frame, wherein the first die cavity splicing component, the second die cavity splicing component and the fixed die locking frame are used for forming a die cavity;

the combination of the outer contours of a part of the first die cavity splicing component and the second die cavity splicing component forms an outer contour which is matched with the fixed die locking frame and can be locked by the fixed die locking frame,

the first mold cavity split assembly includes a core split;

the second die cavity splicing component comprises a right sliding block, a movable block and a hole body, wherein the hole body matched with the movable block is arranged on the right sliding block, and the movable block is in sliding fit with the right sliding block through the hole body;

the core segment comprises a first face adjacent to the movable block, the movable block comprises a second face adjacent to the core segment, and the first face and the second face are respectively two faces for forming a die cavity;

the die structure capable of realizing ultra-high pressure injection molding on a common injection molding machine further comprises a right inclined block;

the number of the right oblique blocks is 2, and the right oblique blocks with the number of 2 comprise a first right oblique block and a second right oblique block;

the first right inclined block is provided with a groove matched with the movable block, and the groove is used for enabling a part of the movable block to be pushed into the groove by pressure when the movable block is subjected to the pressure in the die cavity;

the second right inclined block is used for replacing the first right inclined block, so that the movable block can be pushed to reset by the locking force of the fixed die locking frame after being pushed.

Preferably, the core segment is a left slider that mates with a right slider.

Preferably, the cross-section of the end of the hole is rectangular, that is, the cross-section of the end of the movable block matched with Kong Tixiang is rectangular.

Preferably, the groove comprises a groove bottom surface, and the surface, close to the groove bottom surface, of the movable block is matched with the groove bottom surface, so that the movable block can be clung to the groove bottom surface.

Preferably, the shaft section of the fixed die locking frame is trapezoidal.

Preferably, the first cavity split assembly further comprises a left diagonal block, the left diagonal block being connected to the left slider.

Preferably, the outer side surface of the left inclined block and the outer side surface of the right inclined block are combined to form a locking surface, and the locking surface is provided with a slope matched with the trapezoid of the fixed die locking frame.

Preferably, the slope is 2 °.

Preferably, the movable block and the right sliding block are in precise fit.

Compared with the prior art, the utility model has the beneficial effects that: the ultra-high pressure injection molding of the optical plastic product can be realized on the common injection molding machine, and compared with the condition that the high-end booster injection molding machine is needed to be purchased in the prior art, the production cost of the optical plastic product is reduced under the condition that the price of the common injection molding machine is 8 to more than 10 times.

Additional aspects and advantages of the utility model will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model.

Drawings

In order to more clearly illustrate the embodiments of the utility model or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the utility model, and that other drawings can be obtained according to these drawings without inventive faculty for a person skilled in the art.

Fig. 1 is a schematic structural view of a plastic product.

Fig. 2 is a schematic diagram of a prior art structure.

Fig. 3 is a schematic structural view of the present utility model.

Fig. 4 is a schematic structural view of the right slider.

Fig. 5 is a schematic structural view of the movable block.

Fig. 6 is a schematic perspective view of the movable block of fig. 5 mated with the right slider of fig. 4.

Fig. 7 is a schematic view of the movable block of fig. 6 sliding in the direction of arrow.

Fig. 8 is a schematic view of the structure of fig. 7 in a sectional state and with a stopper additionally provided.

Fig. 9 is a schematic diagram of the structure of the groove on the right oblique block.

Fig. 10 is a schematic structural view of the movable block when the movable block is pressed and then moves outwards to be attached to the bottom surface of the groove.

Fig. 11 is a schematic view of an exploded structure when the fixed mold lock frame of the injection molding machine is opened.

Fig. 12 is a schematic view of an exploded structure of the first right swash block with grooves removed based on fig. 11.

Fig. 13 is an enlarged schematic view of a portion a of fig. 12.

Fig. 14 is a schematic view of an exploded structure when the first right swash block with grooves of fig. 12 is removed.

Fig. 15 is a schematic structural view of a second right oblique block.

Fig. 16 is a schematic view of an exploded structure when the first right swash block with grooves in fig. 14 is replaced with a second right swash block with the same external dimensions as the first right swash block but without grooves.

Fig. 17 is a schematic view of the structure of the mold clamping by the stationary mold lock frame based on fig. 16.

Fig. 18 is a schematic view of an exploded structure of the mold of fig. 17 when separated.

Fig. 19 is a schematic view of an explosion structure when the left slider 6 and the right slider 11 of fig. 18 are opened and a plastic product can be taken out.

Reference numerals and names in the drawings are as follows:

the mold cavity 1, the first mold cavity splicing component 2, the second mold cavity splicing component 3, the fixed mold locking frame 4, the sliding block 5, the movable block 6, the hole body 7, the groove 8, the left sliding block 9, the injection molding machine back plate 10, the injection molding machine front plate 11, the left inclined block 12, the first right inclined block 14, the second right inclined block 15, the movable mold plate 16, the plastic product 20, the right sliding block 21, the guide sliding column 22 and the guide sliding hole 23.

Detailed Description

The following description of the technical solutions in the embodiments of the present utility model will be clear and complete, and it is obvious that the described embodiments are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

Referring to fig. 3 to 19, in an embodiment of the present utility model, a mold structure for ultra-high pressure injection molding on a general injection molding machine includes a first mold cavity split assembly 2, a second mold cavity split assembly 3, and a fixed mold locking frame 4 for forming a mold cavity 1, the fixed mold locking frame 4 for locking the first mold cavity split assembly 2 and the second mold cavity split assembly 3,

the combination of the outer contours of a part of the first die cavity splicing component 2 and the second die cavity splicing component 3 forms an outer contour which is matched with the fixed die locking frame 4 and can be locked by the fixed die locking frame 4;

the second die cavity splicing component 3 comprises a right sliding block 5, a movable block 6 and a hole body 7, wherein the right sliding block 5 is provided with the hole body 7 matched with the movable block 6, the movable block 6 is in sliding fit with the right sliding block 5 through the hole body 7, the two parts are precisely matched according to the rectangular periphery of the movable block 6, and the gap is smaller than the overflow value of the plastic (the gap value that molten plastic cannot overflow under limited pressure).

The first die cavity split assembly 2 comprises a core split block which is a left slide 9 matched with a right slide 5;

the core segment comprises a first face adjacent to the movable block 6, the movable block 6 comprises a second face adjacent to the core segment, the first and second faces being respectively two faces for constituting the mould cavity 1;

the number of the right oblique blocks is 2, and the right oblique blocks with the number of 2 comprise a first right oblique block 14 and a second right oblique block 15;

the first right inclined block 14 is provided with a groove 8 matched with the movable block 6, and the groove 8 is used for enabling a part of the movable block 6 to be pushed into the groove 8 by pressure when the movable block 6 is subjected to the pressure in the die cavity 1;

compared with the mode that a molding cavity of the plastic product 20 is formed by directly passing through the left sliding block 9 and the right sliding block 21 as shown in fig. 1 and 2 in the prior art, the use effect that the ultra-high pressure injection molding can be realized by using a common mold is achieved.

Example 1:

referring to fig. 4, 5 and 6, the rectangular periphery of the movable block 6 is fitted in the rectangular hole 7 of the right slider 5, and the two are precisely fitted according to the rectangular periphery of the movable block 6, and the gap should be smaller than the edge-overflowing value of the plastic (the gap value that the molten plastic will not overflow under limited pressure).

The large plane of the movable block 6 is the surface constituting the cavity 1 in fig. 3, and when the surface is subjected to positive pressure, the movable block 6 moves outwards in the direction of force to the state shown in fig. 7 and 8.

In fig. 7 and 8, the movable block 6 is moved outward by the positive pressure of the molten plastic.

And it can be seen in fig. 3 that the inclined surface of the movable block 6 is attached to the inclined surface of the right inclined block.

According to the utility model, a groove 8 is formed in the inclined surface of the right inclined block, the depth of the groove 8 is used for controlling the right moving distance of the movable block 6 in fig. 7 and 8, the groove 8 is communicated with the die cavity 1, one surface on the movable block 6 can be a surface for forming the die cavity 1, and then the space size of the die cavity 1 can be changed when the movable block 6 is pressed by the injection molding pressure or the die clamping pressure of the fixed die locking frame 4 to be forced to slide.

As shown in fig. 9 and 10, the groove 8 on the right inclined block is that the movable block 6 moves outwards to be attached to the bottom surface of the groove 8 after being pressed.

In fig. 3, after the injection molding machine starts injecting molten plastic into the mold cavity 1 through the gate, the movable block 6 in fig. 3 is moved outward by the pressure of the molten plastic until the inclined surface of the movable block 6 abuts against the groove bottom surface of the groove 8 of the first right inclined block 14. At this point the injection molding machine is opened, see FIG. 11.

The first right sloping block 14 with the groove 8 is removed, see fig. 12 and 13.

As can be seen from fig. 12 and 13, the inclined surface of the movable block 6 is slightly higher than the inclined surface of the right slider 5, and this limitation may be, for example, limited by a stopper known to those skilled in the art, due to the limitation of the mechanism on the mold, so that the movable block 6 does not continue to move outwards. At this time, the outer dimension of the inclined block with the groove 8 is changed to be identical to that of the right inclined block, but the second right inclined block 15 with the groove 8 is not arranged, see fig. 14 and 15.

The state is as shown in fig. 16.

Then closing the mold, see fig. 17.

In fig. 17, since the close-fitting inclined surface of the right inclined block and the fixed mold locking frame 4 is 2 °, the mold clamping force of the injection molding machine is 250 tons, which has been known in the past, the thrust force of the right inclined block 3 to the movable block 6 is obtained by the following formula:

f=250++tan 2+= 7159.06 tons

The projected area of the cavity 1 was 600 square cm. The pressure F2 to which the molten plastic, which is not completely solidified, is subjected inside the mold cavity 1 is obtained by the following formula:

f2 = 7159.06 +.600=11.93 tons/square centimeter (corresponding to 120 mpa), which is of course not required in real production. The angle of the contact slope of the swash block and the movable block 6 can be appropriately adjusted to obtain an appropriate high pressure. An important condition for the clamping operation of fig. 17 is that the mold is maintained at a high temperature. (above the Vicat point of the processed plastic) the plastic is in the molten state.

Next, the movable plate of the injection molding machine is retracted to open the mold, and a large friction force is generated between the mold stationary mold locking frame 4 and the left and right diagonal blocks 12 and 12 in fig. 17, and this friction force F3 is obtained by the following formula:

f3 7159.06 tons X0.15= 1073.86 tons

(Steel and Steel friction coefficient of 0.12 to 0.15)

This value is greater than the opening force of the injection molding machine. Since the angle of the inclined surface of the inclined block to the movable block 6 and the right slider 5 is 20 °, the positive pressure between the inclined block and the movable block 6 and the right slider 5 is F4:

f4 =250 tons/tan 20= 686.87 tons

The friction force F5 between the inclined block and the movable block 6 and the right slider 5 is:

f5 = 686.87X0.15 =103 tons

The injection molding machine can pull the movable mold plate 16 of fig. 3 out of the mold, since the right slider 5 of fig. 3 is connected to the movable mold plate 16 by a mechanism. At the same time of separating the right slide block 5 from the right inclined block 15, the positive pressure between the inclined surfaces of the right inclined block 15 and the fixed mold locking frame 4 disappears, and the friction force also disappears. The mold is separated by continued pushing back of the movable plate of the injection molding machine, see fig. 18.

The mating mechanism on the mold opens the left slider 9 and the right slider 5 and enters a state in which the product can be taken out, see fig. 19.

It should be noted that, in the above-mentioned scheme, because the right inclined block is to be replaced, namely, the first right inclined block 14 is replaced by the second right inclined block 15 to carry out shoveling, the injection molding machine is opened and closed twice in the whole process, when the first right inclined block 14 is adopted for the first closing, the movable block 6 can be pushed by injection molding pressure to enlarge the volume of the mold cavity 1 to carry out injection molding, and after the molten plastic is filled in the enlarged mold cavity 1, the pressure of the molten plastic pushes the inclined surface of the movable block 6 to be in contact with the bottom surface of the groove 8 on the first right inclined block 14 with the groove. The first right swash block 14 is then removed after opening the injection molding machine.

Meanwhile, when the first right inclined block 14 is removed, the movable block 6 can be limited by, for example, fixing the stop block 30 arranged on the right slide block, on one hand, the stop block 30 is matched with the groove 8 of the first right inclined block 14 to define the distance that the movable block 6 can be pushed to deviate by injection molding pressure to the right most, on the other hand, in the process of replacing the first right inclined block 14 with the second right inclined block 15, on the other hand, the situation that after the first right inclined block 14 is removed, the movable block 6 can not be erroneously operated to deviate to the right continuously, the situation that the mold cavity 1 can not be continuously enlarged is ensured, and the normal use of the right inclined block and the fixed mold locking frame 4 is not influenced by the setting positions of the stop block 30, namely, the setting positions of all parts can not collide with each other, so that the functions of the stop block can be realized, and in the extended embodiment, the number of the stop blocks 30 for limiting the movable block 6 can be set to 2 according to the needs, so that the blocking limitation can be realized on the multiple positions of the movable block 6 at the same time, so as to block the more uniform stress, and the common implementation mode known by the person in the field can be realized.

After the first right oblique block 14 is removed, a tool such as a heat-insulating glove or a clamp can be used for assisting the removal, and after the removal, the second right oblique block 15 is replaced for performing a second closing, and in the closing process of the injection molding machine, the front plate 11 of the injection molding machine drives the fixed mold locking frame 4 to lock the left oblique block 12 and the second right oblique block 15, so that the second right oblique block 15 is shoveled and extruded by the thrust of the injection molding machine.

It should be noted that the mold must be maintained at a sufficient temperature during the second closing of the injection molding machine to perform shoveling. That is, referring to fig. 17, an important condition for the mold closing operation performed by the second closing operation is that the mold is kept at a high temperature. (above the Vicat point of the processed plastic) the plastic is in the molten state.

Because the second right inclined block 15 is relatively free of the groove 8 relative to the first right inclined block 14, the movable block 6 can not be dislocated through the groove 8 to enlarge the die cavity 1, and then the die cavity 1 with the enlarged volume is shoveled and extruded again to the original size in the second die assembly, namely in the second locking through the fixed die locking frame 4. After this injection molding machine has been closed, the shoveling action is also completed, and after the mold has cooled, it is opened again in order to remove the plastic article 20 and the second right bevel block 15, and to replace it with the first right bevel block 14. The next cycle is performed.

Example 2:

in a preferred embodiment, the core tile is a left slider 9 that mates with a right slider 5.

The left slide block 9 and the right slide block 5 can move in the horizontal direction through a translation structure, and the block can limit the moving range through a stop block so as to be matched with the fixed die locking frame 4 to lock the translation movement caused by applying force to the left slide block 9 and the right slide block 5, and the translation structure, namely the structure of directional translation sliding, can adopt a common slide rail track and a mode of opening and closing an injection molding machine, which are all known by a person of ordinary skill in the art.

The utility model also comprises a rear plate 10 of the injection molding machine and a front plate 11 of the injection molding machine, wherein the fixed die locking frame 4 is fixedly connected with the front plate 11 of the injection molding machine, and the movable die plate 16 is fixedly connected with the rear plate 10 of the injection molding machine.

The translation structure is fixedly connected to the movable mold plate 16, so that when the right slide block 5 is separated from the right inclined block during demolding, the positive pressure between the inclined surfaces of the right inclined block and the fixed mold locking frame 4 disappears, and the friction force also disappears. The mold is separated by pulling back the movable platen of the injection molding machine by the back platen 10 of the injection molding machine, see fig. 18.

The pulling, as well as the pulling of the front plate 11 of the injection molding machine, is understood to be driven by a linear drive assembly commonly found on injection molding machines, and is an extension embodiment known to those of ordinary skill in the art.

Preferably, the end section of the hole 7 is rectangular, i.e. the end section of the movable block 6 that mates with the hole 7 is also rectangular.

Preferably, the groove 8 comprises a groove bottom surface, and the surface, close to the groove bottom surface, of the movable block 6 is matched with the groove bottom surface, so that the movable block 6 can be closely attached to the groove bottom surface, and the movable block 6 is precisely matched with the right sliding block 5.

Preferably, the axial cross-sectional shape of the fixed mold lock frame 4 is trapezoidal.

Preferably, the first mold cavity split assembly 2 further comprises a left diagonal block 12, the left diagonal block 12 being connected to the left slider 9.

Preferably, the outer side surface of the left inclined block 12 and the outer side surface of the right inclined block are combined to form a locking surface, the locking surface has inclination matched with the trapezoid of the fixed die locking frame 4, the movable block 6 can be provided with a guide sliding column 22, the right inclined block can be provided with a guide sliding hole 23 matched with the guide sliding column, so that the direction of sliding fit of the movable block 6 and the right inclined block can be defined more accurately, and the extension implementation manner known by a person of ordinary skill in the art is realized.

Preferably, the inclination is 2-6 degrees, and the specific degree is mainly set according to the requirement of locking the locking surface and the fixed die locking frame 4, and meanwhile, when the movable block 6 is pushed by injection molding pressure to enable a part of the movable block to be protruded, and further the right inclined block attached to the inclined surface of the movable block 6 is protruded, the inclination is ensured to enable the fixed die locking frame 4 to smoothly clamp the left inclined block 12 and the right inclined block, which belongs to an extension implementation mode known by a person of ordinary skill in the art.

Wherein, the ultra-high pressure in the patent name of the application refers to the injection molding pressure which can reach 300 megapascals (3000 kg/square centimeter).

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "configured," "connected," "secured," "screwed," and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intermediaries, or in communication with each other or in interaction with each other, unless explicitly defined otherwise, the meaning of the terms described above in this application will be understood by those of ordinary skill in the art in view of the specific circumstances.

It will be evident to those skilled in the art that the utility model is not limited to the details of the foregoing illustrative embodiments, and that the present utility model may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the utility model being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

Claims

1. The die structure comprises a first die cavity splicing component, a second die cavity splicing component and a fixed die locking frame, wherein the first die cavity splicing component, the second die cavity splicing component and the fixed die locking frame are used for forming a die cavity;

the first mold cavity split assembly includes a core split;

2. The mold structure for ultra-high pressure injection molding on a common injection molding machine according to claim 1, wherein the core block is a left slider that mates with a right slider.

3. The mold structure for ultra-high pressure injection molding of claim 1, wherein the end section of the hole is rectangular, i.e. the end section of the movable block mating with Kong Tixiang is rectangular.

4. The mold structure for ultra-high pressure injection molding of claim 1, wherein the recess comprises a bottom surface, and the movable block is adapted to be closely attached to the bottom surface of the recess.

5. The mold structure capable of realizing ultra-high pressure injection molding on a common injection molding machine according to claim 1, wherein the axial section shape of the fixed mold locking frame is trapezoid.

6. The mold structure for ultra-high pressure injection molding of claim 5, wherein the first mold cavity split assembly further comprises a left diagonal block connected to the left slide block.

7. The mold structure for ultra-high pressure injection molding on a common injection molding machine according to claim 6, wherein the outer side surface of the left inclined block and the outer side surface of the right inclined block are combined to form a locking surface, and the locking surface has a gradient matched with the trapezoid of the locking frame of the fixed mold.

8. The mold structure for ultra-high pressure injection molding on a common injection molding machine according to claim 7, wherein the inclination is 2 °.

9. The mold structure for ultra-high pressure injection molding on a common injection molding machine according to claim 1, wherein the movable block is precisely matched with the right slider.