CN115230078A - Flip-chip mold and injection molding method - Google Patents

Abstract

The invention provides an inverted mold and an injection molding method, which can solve the problems of poor mold closing and abrasion of the grinding surfaces of a movable mold and a static mold caused by the fact that the end part of the movable mold of the inverted mold sinks under the action of gravity in the prior art. The inverted mold comprises a movable mold and a fixed mold, the movable mold comprises a mold core and a movable mold plate, the fixed mold comprises a mold cavity and a fixed mold seat plate, and the mold core and the mold cavity are matched to form a molding space; the mold core is an aluminum mold core, a supporting device is arranged in the movable mold and can stretch out and draw back along the mold opening and closing direction, and before the sizing material is filled and reaches the forming space in the initial stage of mold closing, the supporting device is in an extending state, and the stretching end of the supporting device abuts against the inner wall of the cavity. The movable mould core is an aluminum core, so that the whole weight of the movable mould is reduced, the problem that the movable mould part of the mould sinks and deforms under the action of gravity is effectively solved, and the abrasion of the bedding and matching surfaces of the movable mould and the static mould is reduced; the supporting device is arranged in the movable die, so that the main die assembly force is borne during die assembly, and the defect that the pressure resistance of the aluminum core is lower than that of the steel core is overcome.

Description

Flip-chip mold and injection molding method

technical field

The invention belongs to the technical field of injection molds, and in particular relates to a structural improvement of a flip-chip mold and an injection molding method using the flip-chip mold for injection molding.

Background technique

As a tool for producing plastic products, injection molds can endow plastic products with complete structure and precise dimensions. The injection mold is generally composed of a movable mold and a fixed mold. The movable mold is installed on the moving template of the injection molding machine, and the fixed mold is installed on the fixed template of the injection molding machine. Due to the special structure of the finished product or the appearance requirements of the finished product, the glue feeding and ejection are on the same side of the finished product. Such a mold structure is called a flip mold.

For example, in order to improve the appearance quality of the casing products of the TV or display equipment, the mold for making the casing of the TV and display equipment generally needs to use a flip-chip mold, that is, the hot runner is installed on the side of the moving mold core of the injection mold. Due to the structure of the moving mold Compared with the static mold, it is more complicated and heavier. After flipping, the hot runner related structure is installed on the moving mold. Compared with the static mold, the structure of the moving mold is more complicated, the weight is further increased, and the floating range of the moving mold is Large, according to the cantilever beam principle of material mechanics, the end of the movable mold part will sink due to gravity, resulting in poor mold clamping effect. For example, the phenomenon of mold clamping dislocation leads to a high product defect rate. It causes serious wear on the grinding and matching surfaces of the movable die and the static die, which seriously affects the life of the die.

Since the rigidity of the injection molding machine itself is certain, the weight of the core part located at the end of the movable mold of the injection mold is the main factor affecting the sinking of the movable mold of the injection mold. The weight of the movable mold is installed to solve the problems of poor mold clamping and serious wear of the grinding and matching surfaces of the movable mold and the static mold due to the sinking of the end of the movable mold as much as possible.

SUMMARY OF THE INVENTION

The invention provides a flip-chip mold and an injection molding method, which can solve the problems in the prior art that the movable mold end of the flip-chip mold sinks under the action of gravity, resulting in poor mold clamping and serious wear on the grinding and matching surfaces of the moving mold and the static mold.

In some embodiments of the present application, a flip-chip mold is proposed, including a movable mold and a fixed mold, the movable mold includes a core and a movable template that is fixedly connected with the core, the fixed mold It includes a steel mold cavity and a fixed mold seat plate that is fixedly connected with the mold cavity. The mold core and the mold cavity cooperate to form a molding space; the mold core is an aluminum mold core, and the movable mold core is formed. There is a support device in the mold, and the support device can expand and contract along the mold opening and closing direction so that its telescopic end can extend into the molding space or retract out of the molding space. Before entering the molding space, the support device is in an extended state and the telescopic end abuts against the inner wall of the cavity.

In some embodiments of the present application, the number of the support devices is multiple, and the multiple support devices are evenly distributed along the circumferential edge of the forming space.

In some embodiments of the present application, a through escape portion for avoiding the support device is formed on the core, the support device is fixed at the movable template, and the telescopic end passes through the through escape portion Extend into the molding space or retract out of the molding space.

In some embodiments of the present application, when the support device is retracted out of the molding space, the end surface of the telescopic end is flush with the surface of the core, and the circumferential side surface of the telescopic end is aligned with the through-avoiding portion Seal fit.

In some embodiments of the present application, the support device includes an oil cylinder and a retractable part, the oil cylinder is fixed inside the movable mold, the retractable part is fastened to a piston rod of the oil cylinder, and the oil cylinder The retractable component can be driven to expand and contract along the mold opening and closing directions.

In some embodiments of the present application, the movable platen is an aluminum plate, and a wear-resistant and pressure-resistant insert is provided on the parting surface of the movable platen outside the forming space and surrounding the forming space for at least one week. .

In some embodiments of the present application, the wear-resistant and pressure-resistant inserts are flush with the parting surface of the movable mold.

In some embodiments of the present application, the core is a high-strength aluminum core, and the movable template is a high-strength aluminum plate.

In some embodiments of the present application, the telescopic end is covered with an elastic buffer member.

In some embodiments of the present application, an injection molding method for a flip-chip mold is also proposed, comprising the following steps:

(1) The support device is extended before the mold is closed or at the same time as the mold is closed;

(2) After the mold is closed and before the rubber fills into the molding space, the support device remains in an extended state and its telescopic end abuts on the inner wall of the cavity;

(3) The rubber material continues to fill and reaches the molding space, and the support device retracts out of the molding space until the end face of its telescopic end is flush with the surface of the core;

(4) The sizing material continues to be filled until the entire molding space is filled, and the filling is ended;

(5) Pressure maintaining, cooling, mold opening and demoulding.

Compared with the prior art, the present invention has the following advantages and positive effects:

1. The movable mold core is made of aluminum, which reduces the overall weight of the movable mold and reduces the torque, which effectively reduces the problem of sinking and deformation of the movable mold part due to gravity, improves the clamping effect, and reduces the dynamic and static The wear of the mold grinding surface ensures the stability of the mold;

2. In the process of mold clamping and injection molding, due to the large clamping force, the supporting device can be expanded and retracted along the mold opening and closing direction by setting the supporting device in the movable mold. In the initial stage of mold clamping, before the rubber material is filled and reaches the molding space, the supporting device In the extended state and its telescopic end abuts on the inner wall of the cavity, so as to bear the main clamping force when the mold is closed;

3. In the filling stage of the injection molding compound, the support device can be retracted out of the molding space, and the clamping force can be transferred to the parting surface of the mold and the plastic melt, which also reduces the clamping force of the aluminum core. By setting the support device, the aluminum core can also meet the pressure resistance requirements of the injection molding process, making up for the defect that the pressure resistance of the aluminum core is lower than that of the steel core, and improving the service life of the aluminum core. .

Description of drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are some embodiments of the present invention, and for those of ordinary skill in the art, other drawings can also be obtained from these drawings without any creative effort.

Fig. 1 is the structural representation of the flip-chip mold of the present invention;

2 is a schematic structural diagram of a flip-chip movable mold of the present invention;

Fig. 3 is a schematic diagram of the arrangement structure of the wear-resistant and pressure-resistant inserts on the movable template of the flip-chip die of the present invention;

FIG. 4 is a cross-sectional view taken along the line A-A in FIG. 3 .

Reference numerals: 10-moving die; 11-core; 12-moving template; 13-hot runner plate; 14-moving die seat plate; 15-leg; block; 18- movable mold parting surface; 19- annular groove; 20- fixed mold; 21- cavity; 22- fixed mold seat plate; 30- molding space; 40- support device; 41- telescopic end; 42- oil cylinder ; 43 - Retractable parts.

Detailed ways

The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "horizontal", "inner", "outer" and the like indicate the orientation or position The relationship is based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore It should not be construed as a limitation of the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed to indicate or imply relative importance.

In the description of the present invention, it should be noted that the terms "installed", "connected" and "connected" should be understood in a broad sense, unless otherwise expressly specified and limited, for example, it may be a fixed connection or a detachable connection Connection, or integral connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the internal communication of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in specific situations.

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

FIG. 1 is a schematic view of the structure of the flip-chip mold of the present embodiment, and FIG. 2 is a schematic view of the structure of the movable mold of the flip-chip mold of the present embodiment. 1 and 2, the flip-chip mold in this embodiment includes a movable mold 10 and a fixed mold 20. The movable mold 10 includes a core 11 and a movable template 12 that is fixedly connected to the core 11, and of course also includes a hot runner plate 13. The movable mold seat plate 14 and the plurality of legs 15, the fixed mold 20 includes a steel cavity 21 and a fixed mold seat plate 22 that is fixedly connected with the mold cavity 21. The fixed mold seat plate 22 is also made of steel The plate, the core 11 and the cavity 21 cooperate to form the molding space 30 .

Different from the prior art, in this embodiment, the core 11 is an aluminum core, that is, the material is aluminum, and a support device 40 is provided in the movable mold 10, and the support device 40 can be opened and closed in the direction of the mold (as shown in FIG. 1 ). (shown in the direction of the arrow) telescopic so that the telescopic end 41 can be extended into the molding space 30 or retracted away from the molding space 30. In the initial stage of mold clamping during the injection molding process, the rubber is filled before reaching the molding space 30, that is, it has been closed at this stage. But the rubber compound has not reached the molding space 30 , the support device 40 is in an extended state and its telescopic end 41 abuts against the inner wall of the cavity 21 .

In this embodiment, the core 11 on the movable mold 10 is an aluminum core, which reduces the overall weight of the movable mold 10. Especially, the core 11 is located at the end of the movable mold 10, and the aluminum core is light in weight, which also makes the movable mold 10 lighter. 10 The torque becomes smaller, which effectively alleviates the problem of sinking and deformation of the movable mold part of the mold due to gravity, improves the mold clamping effect, reduces the wear of the grinding surface of the movable mold 10 and the static mold 20, and thus ensures the stability of the mold. At the same time, the aluminum core 11 can also improve the cooling and processing efficiency of the mold, shorten the molding time, and reduce the energy consumption.

In addition, in the process of mold clamping and injection molding, due to the large clamping force, the pressure resistance (that is, the strength) of the aluminum material is seriously lower than that of the steel material. In this embodiment, the above-mentioned support device 40 is provided in the movable mold 10, so that the support device 40 can expand and contract along the direction of mold opening and closing. In the initial stage of mold closing, the support device 40 is placed in the mold space before the rubber filling reaches the molding space. In the extended state and its telescopic end abuts on the inner wall of the cavity 21, so as to withstand the surface of the cavity 21 during mold clamping, bear most of the clamping force, and correspondingly reduce the clamping force of the aluminum core 11. pressure; in the filling stage of the injection molding compound, the support device 40 can be retracted and separated from the molding space 30, and the clamping force can be transferred to the parting surface of the mold and the plastic melt to bear together, and the aluminum core 11 is also reduced accordingly. If the clamping force is high, the support device 40 is provided, so that the aluminum core 11 can also meet the pressure resistance requirements of the injection molding process, which makes up for the defect that the pressure resistance of the aluminum core 11 is lower than that of the steel core, and improves the aluminum core 11. The service life of the aluminum core is improved, so as to make up for the defect that the pressure resistance of the aluminum core is lower than that of the steel core, and the service life of the aluminum core is improved.

Specifically, the support device 40 is made of die steel material, and the telescopic end 41 of the support device 40 is mainly abutted and supported on the molding surface without appearance requirements when it is configured to be in the extended state.

In order to reliably support the aluminum core 11, especially when the volume of the molded product is large, the supporting force for the core 11 can be improved, in some embodiments of the present application, the number of the supporting devices 40 may be multiple, The plurality of supporting devices 40 can be evenly distributed along the circumferential edge of the forming space 30 , that is, evenly supported at the circumferential edge of the product, so as to avoid indentation on the main appearance surface of the product as much as possible.

In order to further prevent the support device 40 from causing indentation on the appearance surface of the product, the telescopic end 41 of the support device 40 may be covered with an elastic buffer member, such as a rubber pad.

In some embodiments of the present application, as shown in FIG. 2 , the core 11 is formed with a through-avoiding portion 16 for avoiding the support device 40 , specifically a through hole. The support device 40 is fixed at the movable template 12 , and the support device 40 is retractable and retractable. The end 41 protrudes into the forming space 30 or retracts away from the forming space 30 through the penetrating escape portion 16, so that the telescopic stroke of the support device 40 can be minimized as much as possible, and the volume and weight of the support device 40 can be reduced as much as possible. Thus, the adverse effect on the weight of the movable die 10 is minimized.

Due to the provision of the through-avoidance portion 16, there is a risk of material overflowing through the through-avoidance portion 16 during the filling and injection molding process of the rubber compound. To solve this problem, in this embodiment, when the support device 40 is retracted and separated from the molding space 30, the support device 40 is retracted to the position shown in FIG. 2 , the end face of the telescopic end 41 is flush with the surface of the core 11 and the circumferential side surface of the telescopic end 41 is in sealing fit with the through-avoiding portion 16 . Then, when the supporting device 40 is retracted and separated from the molding space 30 , the telescopic end 41 of the telescopic end 41 just blocks the penetration avoidance portion 16 , thereby preventing the glue from overflowing through the penetration escapement portion 16 ; at the same time, the end surface of the extension end 41 is flat with the surface of the core 11 . In order to ensure the integrity of the molding space 30, the molding quality of the product can be ensured.

In this embodiment, the support device 40 includes an oil cylinder 42 and a telescopic part 43 , the oil cylinder 42 is fixed inside the movable die 10 , the telescopic part 43 is fixed to the piston rod of the oil cylinder 42 , and the oil cylinder 42 can drive the telescopic part 43 along the opening Expansion in the clamping direction.

Specifically, the oil cylinder 42 may be arranged on the movable template 12 or the hot runner plate 13, depending on the actual working conditions. In the case where the volume of the molded product is relatively large, that is, the volume of the molding space 30 is relatively large, multiple support devices 40 may be provided, or multiple telescopic components 43 may be driven by the same oil cylinder 42 at the same time. The supporting force of the core 11.

In some embodiments of the present application, the support device 40 may also be a gas spring, such as a gas spring.

FIG. 3 is a schematic diagram of the arrangement of the wear-resistant and pressure-resistant inserts on the movable platen of the flip-chip mold according to the present embodiment, and FIG. 4 is a cross-sectional view taken along the line A-A of FIG. 3 . In order to further reduce the weight of the movable die 10, in some embodiments of the present application, the movable die plate 12 is also selected as an aluminum plate. At this time, referring to FIG. 3 and FIG. Wear-resistant and pressure-resistant inserts 17 outside the molding space 30 and surrounding the molding space 30 for at least one circumference.

The wear-resistant and pressure-resistant inserts 17 can be made of steel or other wear-resistant and pressure-resistant materials, which can share the clamping force during injection mold clamping, improve the pressure-bearing and wear-resistant properties of the materials in this area, and make up for the pressure resistance of the aluminum movable template 12. Low defects, improve the service life of the whole aluminum-containing movable die 10 .

In this embodiment, the core 11 is a high-strength aluminum core, and the movable template 12 is a high-strength aluminum plate with low density and high strength compared with ordinary aluminum materials, and is not easily deformed when subjected to mold clamping force.

In detail, as shown in FIG. 4 , an annular groove 19 is formed on the parting surface 18 of the movable mold, which is matched with the wear-resistant and pressure-resistant inserts 17. The parting surface 18 is flush to improve the clamping effect and ensure the clamping pressure.

1 to 4, the injection molding method of the above-mentioned flip-chip mold of the present embodiment includes the following steps:

(1) The support device 40 is extended before the mold is closed, or the support device 40 is extended while the mold is closed;

(2) In the initial stage after the mold is closed, before the rubber material is filled through the hot runner system and reaches the molding space 30 , the support device 40 is kept in an extended state and its telescopic end 41 abuts on the inner wall of the cavity 21 ;

(3) The rubber material continues to be filled. When the filling reaches the molding space 30, the support device 40 is retracted and separated from the molding space 30 until the end face of the telescopic end 41 of the support device 40 is flush with the surface of the core 11, that is, the support device 40 Avoid the entire molding space 30;

(4) The sizing material continues to be filled until the entire molding space 30 is filled, and the filling is ended;

(5) Then carry out pressure holding in the clamping state, product cooling after pressure holding, mold opening, product demoulding, until the product is taken out.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, but not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that it can still be The technical solutions described in the foregoing embodiments are modified, or some technical features thereof are equivalently replaced; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims (10)

1. The inverted mold comprises a movable mold and a fixed mold, wherein the movable mold comprises a mold core and a movable mold plate fixedly connected with the mold core into a whole, the fixed mold comprises a steel mold cavity and a fixed mold seat plate fixedly connected with the mold cavity into a whole, and the mold core and the mold cavity are matched to form a molding space; the method is characterized in that:

the mold core is an aluminum mold core, a supporting device is arranged in the movable mold, the supporting device can stretch along the mold opening and closing direction to enable the stretching end of the supporting device to extend into the molding space or retract to be separated from the molding space, after mold closing, before glue is filled in the molding space, the supporting device is in an extending state, and the stretching end abuts against the inner wall of the cavity.

2. The flip-chip mold of claim 1, wherein:

the quantity of strutting arrangement is a plurality of, and is a plurality of strutting arrangement follows the circumference edge equipartition in shaping space.

3. The flip-chip mold of claim 1, wherein:

the mold core is provided with a through avoiding part for avoiding the supporting device, the supporting device is fixedly arranged at the movable mold plate, and the telescopic end extends into the molding space or retracts to separate from the molding space through the through avoiding part.

4. The flip-chip mold of claim 3, wherein:

when the supporting device retracts to be separated from the forming space, the end face of the telescopic end is flush with the surface of the mold core, and the circumferential side face of the telescopic end is in sealing fit with the through avoiding portion.

5. The flip-chip mold of claim 1, wherein:

the supporting device comprises an oil cylinder and a telescopic component, the oil cylinder is fixedly arranged inside the movable die, the telescopic component is fixedly connected with a piston rod of the oil cylinder, and the oil cylinder can drive the telescopic component to stretch along the die opening and closing direction.

6. The flip-chip mold of claim 1, wherein:

the movable mould plate is made of aluminum plates, and a wear-resistant and pressure-resistant insert which is located on the outer side of the forming space and surrounds the forming space for at least one circle is arranged on the parting surface of the movable mould plate.

7. The flip-chip mold of claim 6, wherein:

and the wear-resistant pressure-resistant insert is parallel and level to the parting surface of the movable die.

8. The flip-chip mold of claim 7, wherein:

the mold core is a high-strength aluminum mold core, and the movable mold plate is a high-strength aluminum plate.

9. The flip-chip mold of claim 1, wherein:

the telescopic end is covered with an elastic buffer component.

10. An injection molding method based on the flip-chip mold according to any one of claims 1 to 9, comprising the steps of:

(1) Before or during the die closing, the supporting device extends out;

(2) After the die is closed and before the rubber material is filled to reach the forming space, the supporting device keeps an extending state, and the telescopic end of the supporting device abuts against the inner wall of the cavity;

(3) The rubber material is continuously filled and reaches the forming space, and the supporting device retracts to be separated from the forming space until the end surface of the telescopic end of the supporting device is flush with the surface of the mold core;

(4) Continuously filling the rubber material until the whole forming space is filled with the rubber material, and finishing filling;

(5) Pressure maintaining, cooling, mold opening and demolding.

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