CN112372957A

CN112372957A - Ultrasonic micro-injection molding system

Info

Publication number: CN112372957A
Application number: CN202011293749.1A
Authority: CN
Inventors: 汪红兵
Original assignee: Suzhou Vocational University
Current assignee: Suzhou Vocational University
Priority date: 2020-11-18
Filing date: 2020-11-18
Publication date: 2021-02-19

Abstract

The present invention provides an ultrasonic micro-injection molding system, which includes a male mold and a female mold that cooperate with each other to form a cavity, an injection mechanism for injecting melt into the cavity, and a first piezoelectric vibrator and a second piezoelectric vibrator. For the piezoelectric vibrators, the ends of the tool heads of both act on the melt from the side of the female mold and the side of the male mold, respectively. Due to the dual vibrator structure used in the piezoelectric unit, the ultrasonic micro-injection molding system proposed in the present application uses the dual vibrators to apply high-frequency vibration to the plastic melt in injection molding from different directions, further reducing the injection pressure in the injection molding of microplastic devices. , which further improves the cavitation effect in the plasticizing process of the melt, thereby significantly improving the melt fluidity and greatly improving the mold filling ability.

Description

Ultrasonic micro-injection molding system

Technical Field

The invention relates to the technical field of injection molding, in particular to an ultrasonic micro-injection molding system.

Background

The traditional injection molding technology develops rapidly, and products thereof are widely applied in many fields such as automobile industry, daily necessities, household appliances, electronics, medical treatment and the like. These products are usually large in size and have no special requirements for precision, such as automobile bumpers, television and mobile phone shells, medical plastic bottle caps and the like.

In recent years, with the rapid development of the technical fields of biomedicine, micro optics, microfluidic devices, micro electro mechanical systems and the like, higher requirements on the microscopic degree of injection molding devices are put forward, and the micro injection molding technology is developed at the same time. The microscopic injection molded product has the size of millimeter, the volume is within hundreds of cubic millimeters, or the device has larger overall dimension but the size of the integral characteristic part is millimeter or even tens of micrometers, and the precision requirement is high.

Micro injection molding is an important branch of microsystem technology, and related research is still in the initial stage, but the micro injection molding becomes an advanced manufacturing technology research hotspot by virtue of potential great advantages such as easy realization of low cost and large-scale production of parts with precise and fine structural characteristics.

Modern microinjection molding technology is developing toward high productivity and high precision, and there is a strong need for a method for smoothly injecting and filling plastic melt into and filling the cavity of the microinjection molding at a proper injection pressure (low energy consumption) and effectively improving residual stress at the time of mold release.

Disclosure of Invention

The invention aims to provide an ultrasonic micro-injection molding system which can obviously improve melt fluidity and greatly improve mold filling capacity.

In order to achieve the purpose, the invention provides an ultrasonic micro-injection molding system which comprises a male die and a female die which are matched with each other to form a cavity, an injection mechanism for injecting melt into the cavity, a first piezoelectric vibrator and a second piezoelectric vibrator, wherein the end parts of tool heads of the first piezoelectric vibrator and the second piezoelectric vibrator act on the melt from the side of the female die and the side of the male die respectively.

Preferably, the female die is arranged on a fixed die plate, and the fixed die plate is arranged on a fixed die base plate; and a charging barrel of the injection mechanism penetrates through the fixed die plate and the fixed die base plate and is communicated with an inner cavity of the female die.

Preferably, the first piezoelectric vibrator is capable of being driven to reciprocate along the extending direction of the barrel, and the end part of the tool head of the first piezoelectric vibrator is positioned in the barrel.

Preferably, the injection mechanism further comprises a fixed base, a lead screw which is arranged on the fixed base and driven by a motor to rotate, and a movable nut which is driven by the lead screw to reciprocate; the first piezoelectric vibrator reciprocates along the extending direction of the charging barrel along with the movable nut.

Preferably, the injection mechanism further comprises an L-shaped connecting plate, one side of which is connected with the moving nut through a fixing nut, and the other side of which supports the first piezoelectric vibrator.

Preferably, the male die is mounted on a male die fixing plate, and the male die fixing plate is fixedly arranged relative to the moving die base plate; a plurality of push rods movably penetrate through the male die fixing plate along the die opening direction, one end of each push rod is connected with a first push rod fixing plate, the first push rod fixing plate is fixedly connected with a first push plate, and the other end of each push rod fixing plate is connected with a push plate; the pushing plate is movably sleeved on the outer side of the male die.

Preferably, the push rod comprises a first push rod and a second push rod which are coaxially arranged; one end of the first push rod is connected with the first push rod fixing plate, the other end of the first push rod is connected with a second push plate, and the second push plate is also connected with a second push rod fixing plate; one end of the second push rod is connected with the second push rod fixing plate, and the other end of the second push rod is connected with the pushing plate.

Preferably, the second piezoelectric vibrator is fixedly provided with respect to the movable die base plate.

Preferably, the punch fixing plate is further fixedly connected with a supporting plate, and a plurality of cushion blocks are fixedly arranged between the supporting plate and the moving die base plate; the main body part of the second piezoelectric vibrator is arranged in a cavity surrounded by the supporting plate, the moving die base plate and the cushion blocks, and the end part of a tool head of the second piezoelectric vibrator penetrates through the supporting plate to reach the male die; and the second push plate and the second push rod fixing plate are provided with through holes for the second piezoelectric vibrators to pass through.

Preferably, a vibrator fixing plate is further fixedly mounted on the inner side of the cushion block, the second piezoelectric vibrator is mounted on the vibrator fixing plate, and the first push rod movably penetrates through the vibrator fixing plate.

The ultrasonic micro-injection molding system comprises a male die and a female die which are matched with each other to form a cavity, an injection mechanism for injecting melt into the cavity, a first piezoelectric vibrator and a second piezoelectric vibrator, wherein the end parts of tool heads of the first piezoelectric vibrator and the second piezoelectric vibrator act on the melt from the side of the female die and the side of the male die respectively.

Ultrasonic vibration formed by the piezoelectric vibrator acts on the plastic melt, and ultrasonic waves act on the plastic melt plasticizing process through a friction heat effect and an ultrasonic cavitation effect, particularly the cavitation effect is the key for influencing the forming quality of the micro plastic device. The energy transfer between the ultrasonic waves and the plastic melt may improve the flowability of the melt.

Because the piezoelectric unit adopts a double-vibrator structure, the ultrasonic micro-injection molding system provided by the application utilizes double vibrators to apply high-frequency vibration to a plastic melt in injection molding from different directions, further reduces the injection pressure in injection molding of a micro-plastic device, and further improves the cavitation effect in the plasticizing process of the melt, thereby obviously improving the melt flowability and greatly improving the mold filling capacity.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

FIG. 1 is a schematic diagram of an ultrasonic micro-injection molding system according to an embodiment of the present invention;

fig. 2 is a schematic structural view of the ultrasonic micro-injection molding system in fig. 1 in an open mold state.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The core of the invention is to provide an ultrasonic micro-injection molding system which can obviously improve the fluidity of a melt and greatly improve the mold filling capacity.

Referring to fig. 1 and 2, fig. 1 is a schematic structural diagram of an ultrasonic micro-injection molding system according to an embodiment of the present invention; fig. 2 is a schematic structural view of the ultrasonic micro-injection molding system in fig. 1 in an open mold state.

In a first embodiment, the present invention provides an ultrasonic micro-injection molding system, comprising a male mold 19 and a female mold 9, which are capable of cooperating to form a complete cavity. Obviously, the ultrasonic micro-injection molding system should also include an injection mechanism for injecting the melt into the mold cavity.

The ultrasonic micro-injection molding system also comprises a first piezoelectric vibrator 1 and a second piezoelectric vibrator 21; the first piezoelectric vibrator 1 acts on the melt from one side of the female die 9 to improve the fluidity of the melt and improve the die filling capacity; the second piezoelectric vibrator 21 acts on the melt from the side of the male die 19, and also serves to improve the fluidity of the melt and to improve the mold filling capability.

The cavity die 9 may be specifically disposed on the fixed die plate 11, the fixed die plate 11 may be further mounted on the fixed die base plate 10, and generally, the cavity die 9, the fixed die plate 11, and the fixed die base plate 10 maintain a fixed position in the operation process of the apparatus.

The cartridge 2 of the injection mechanism passes through the stationary platen 11 and the stationary platen 10, obviously the cartridge 2 is fixedly connected to both, and its cavity should be in communication with the cavity of the female die 9.

The end of the tool bit of the first piezoelectric vibrator 1 may be provided in the barrel 2, and the cross-sectional shape, size, etc. of both should be appropriately set so that both form a piston-like structure. When the end of the tool bit of the first piezoelectric vibrator 1 reciprocates in fig. 1, an injection-related operation can be performed.

The first piezoelectric vibrator 1 can be caused to reciprocate entirely in the extending direction of the barrel 2 to effect the reciprocation of the end of the tool bit thereof in the barrel 2.

In particular, a fixed base 6 may be provided in which a lead screw 8 is mounted, the lead screw 8 being able to rotate on the fixed base 6, which may be achieved by a motor 7 or other drive means.

The movable nut 5 is engaged with the lead screw 8, so that the forward and reverse rotation of the lead screw 8 can drive the movable nut 5 to reciprocate left and right. The first piezoelectric vibrator 1 is connected to the traveling nut 5 so as to reciprocate along the extending direction of the barrel 2 with the traveling nut 5.

An L-shaped connecting plate 3 may be provided to achieve the above-mentioned connection. One side of the L-shaped connecting plate 3 may be fixedly connected to the moving nut 5 through the fixing nut 4, and the first piezoelectric vibrator 1 may be supported by the other side thereof.

The punch 19 can be arranged on the punch retainer 13, and the punch retainer 13 is fixedly arranged relative to the movable die seat plate 18; the prior art can be referred to for specific fixed connection.

The push rod is arranged along the mold opening direction (the direction and position indicated by the arrow in fig. 1 are the mold opening direction and position), passes through the punch retainer 13, and has the freedom degree of relative movement in the left-right direction between the two.

The number of the push rods can be specifically set according to actual needs, one end of each push rod is connected with the first push rod fixing plate 16, and the other end of each push rod is connected with the stripper plate 12. The left side of the first push rod fixing plate 16 is fixedly connected with a first push plate 17, and the part pushing plate 12 is movably sleeved outside the male die 19 and has a reasonable inner size so as to smoothly push out the plastic part in the demolding process.

Further, each push rod can be designed to be split type, that is, can be divided into a first push rod 25 and a second push rod 20 which are coaxially arranged.

One end of the first push rod 25 is connected with the first push rod fixing plate 16, and the other end is connected with the second push plate 23; one end of the second push rod 20 is connected to the second push rod fixing plate 22, and the other end is connected to the stripper plate 12. The second push plate 23 is fixedly connected with the second push rod fixing plate 22.

The second piezoelectric vibrator 21 is fixed to the movable mold base plate 18.

Specifically, a supporting plate 14 may be fixedly disposed on the right side of the punch retainer 13, and a plurality of spacers 15 may be fixedly disposed between the supporting plate 14 and the movable die base plate 18; thus, the supporting plate 14, the movable die plate 18 and the respective spacers 15 can enclose a cavity.

The main body portion of the second piezoelectric vibrator 21 may be disposed in the cavity, and the end portion of the tool bit thereof may pass through the support plate 14 and reach the convex mold 19. The second push plate 23 and the second push rod fixing plate 22 are each provided with a through hole of an appropriate shape and size through which a relevant portion of the second piezoelectric vibrator 21 passes.

The second piezoelectric vibrator 21 can be attached to the vibrator fixing plate 24 by fixing the vibrator fixing plate 24 to the inside of the spacer 15. The vibrator fixing plate 24 has a plurality of through holes with appropriate size and shape so that the first push rods 25 can movably pass through the vibrator fixing plate 24.

Because the piezoelectric unit adopts a double-vibrator structure, the ultrasonic micro-injection molding system provided by the application utilizes the double vibrators to apply high-frequency vibration to the plastic melt in injection molding from different directions, further reduces the injection pressure in injection molding of a micro-plastic device, and further improves the cavitation effect in the plasticizing process of the melt, thereby obviously improving the melt flowability and greatly improving the mold filling capacity.

The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.

The ultrasonic micro-injection molding system provided by the invention is described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.

Claims

1. An ultrasonic micro-injection molding system, comprising a male mold (19) and a female mold (9) that cooperate with each other to form a cavity, and an injection mechanism for injecting melt into the cavity, characterized in that it also includes The ends of the first piezoelectric vibrator (1) and the second piezoelectric vibrator (21) respectively act on the molten metal from the side of the female mold (9) and the side of the male mold (19), respectively. body.

2. The ultrasonic micro-injection molding system according to claim 1, wherein the concave mold (9) is set on a fixed mold plate (11), and the fixed mold plate (11) is mounted on a fixed mold base plate (10). ); the barrel (2) of the injection mechanism passes through the fixed die plate (11) and the fixed die seat plate (10) and communicates with the inner cavity of the female die (9).

3. The ultrasonic micro-injection molding system according to claim 2, wherein the first piezoelectric vibrator (1) can be driven to reciprocate along the extension direction of the barrel (2), and its tool head The end of the barrel is located in the barrel (2).

4. The ultrasonic micro-injection molding system according to claim 3, wherein the injection mechanism further comprises a fixed base (6), a wire mounted on the fixed base (6) and driven by a motor (7) to rotate a rod (8), and a moving nut (5) that is driven by the lead screw (8) to reciprocate; the first piezoelectric vibrator (1) follows the moving nut (5) along the barrel (2) reciprocating movement in the extension direction.

5. The ultrasonic micro-injection molding system according to claim 4, wherein the injection mechanism further comprises an L-shaped connecting plate (3), one side of which is connected to the moving nut (5) through a fixed nut (4). ), the other side of which supports the first piezoelectric vibrator (1).

6. The ultrasonic micro-injection molding system according to any one of claims 1-5, wherein the punch (19) is mounted on a punch fixing plate (13), and the punch fixing plate (13) It is fixedly arranged relative to the movable mold base plate (18); a plurality of push rods move through the punch fixing plate (13) along the mold opening direction, one end of which is connected to the first push rod fixing plate (16), and the first push rod The rod fixing plate (16) is fixedly connected to the first push plate (17), and the other end of the rod fixing plate (16) is connected to the pusher plate (12); the pusher plate (12) is movably sleeved on the outside of the punch (19).

7. The ultrasonic micro-injection molding system according to claim 6, wherein the push rod comprises a coaxially arranged first push rod (25) and a second push rod (20); the first push rod (25) one end is connected to the first push rod fixing plate (16), the other end is connected to the second push rod (23), and the second push rod (23) is also connected to a second push rod fixing plate (22); One end of the second push rod (20) is connected to the second push rod fixing plate (22), and the other end is connected to the pusher plate (12).

8 . The ultrasonic micro-injection molding system according to claim 7 , wherein the second piezoelectric vibrator ( 21 ) is fixedly arranged relative to the movable mold base plate ( 18 ). 9 .

9 . The ultrasonic micro-injection molding system according to claim 8 , wherein the punch fixing plate ( 13 ) is also fixedly connected to a support plate ( 14 ), and the support plate ( 14 ) is connected to the movable mold base. 10 . Several spacers (15) are fixedly arranged between the plates (18); the main part of the second piezoelectric vibrator (21) is arranged between the support plate (14), the movable die base plate (18) and the In the cavity enclosed by each of the spacers (15), the end of the tool head passes through the support plate (14) to reach the punch (19); the second push plate (23) Both the second push rod fixing plate (22) and the second push rod fixing plate (22) are provided with through holes for the second piezoelectric vibrators (21) to pass through.

10. The ultrasonic micro-injection molding system according to claim 9, wherein a vibrator fixing plate (24) is also fixedly installed on the inner side of the spacer block (15), and the second piezoelectric vibrator (21) is installed in the In the vibrator fixing plate (24), the first push rod (25) moves through the vibrator fixing plate (24).