CN110815703B

CN110815703B - Controllable high-precision mold injection molding machine

Info

Publication number: CN110815703B
Application number: CN201911093402.XA
Authority: CN
Inventors: 黄玉华
Original assignee: Wuhan Shengtai Plastic Mould Co ltd
Current assignee: Wuhan Shengtai plastic mould Co.,Ltd.
Priority date: 2019-06-18
Filing date: 2019-06-18
Publication date: 2021-07-13
Anticipated expiration: 2039-06-18
Also published as: CN110103389A; CN110815703A; CN110789052B; CN110103389B; CN110789052A

Abstract

The invention discloses a controllable high-precision mold injection molding machine which comprises a machine base, a fixed mold, a movable mold and an injection molding device, wherein the fixed mold and the injection molding device are installed on the machine base; the movable die comprises a die shell and a plurality of injection heads, a plurality of mutually parallel slideways are arranged on the die shell, the injection heads are in sliding connection with the slideways, one end of each injection head is communicated to the discharge end of the feeding machine, and the other end of each injection head can extend out of the die shell and extend into a hole in the fixed die. The injection molding machine can produce large and complex products, particularly products with slender parts on the surface.

Description

Controllable high-precision mold injection molding machine

The application is a divisional application of the invention patent application 'a controllable high-precision mold injection molding machine'.

Application date of the original case: 2019-06-18

Original application No.: 2019105272325

Original patent name: controllable high-precision mold injection molding machine

Technical Field

The invention relates to the field of injection molding, in particular to a controllable high-precision mold injection molding machine.

Background

An injection molding machine is also known as an injection molding machine or an injection machine. It is a main forming equipment for making various shaped plastic products from thermoplastic plastics or thermosetting plastics by using plastic forming mould. The device is divided into a vertical type, a horizontal type and a full-electric type. The injection molding machine can heat the plastic, apply high pressure to the molten plastic, and inject it to fill the mold cavity.

The existing injection molding machine has a simple working principle, is suitable for products with simple shapes and small volumes, but for products with large volumes and complex surface structures, because the injection head has a long range, the molten plastic can be cooled and solidified too early, so that the molding effect is poor, and the rejection rate is high; moreover, for a large product with a long and thin protruding part on the surface, the precision is poor due to unsmooth exhaust, so that the long and thin protruding part is usually installed at the later stage, the process is more complicated, and the stability of the product is poor compared with that of an integrally formed product.

Therefore, a new controllable high precision mold injection molding machine is needed to solve the above problems.

Disclosure of Invention

The invention aims to provide a new technical scheme of a controllable high-precision mold injection molding machine.

According to a first aspect of the invention, a controllable high-precision mold injection molding machine is provided, which comprises a machine base, a fixed mold, a movable mold and an injection molding device, wherein the fixed mold and the injection molding device are mounted on the machine base, the movable mold is mounted on the injection molding device, the injection molding device comprises a feeding machine, a sliding base and a driving machine, the sliding base is connected with the machine base in a sliding manner, the feeding machine is mounted on the sliding base, the movable mold is mounted at a discharge end of the feeding machine, and the driving machine drives the sliding base to enable the movable mold to slide into or slide out of the fixed mold; the movable die comprises a die shell and a plurality of injection heads, a plurality of mutually parallel slideways are arranged on the die shell, the injection heads have a certain length and are in sliding connection with the slideways, one ends of the injection heads are communicated to the discharge end of the feeding machine, and the other ends of the injection heads can extend out of the die shell and extend into the holes in the fixed die.

Preferably, a piston sealing ring is fixed at one end of the injection head, which is communicated with the discharge end of the feeder, and a wear-resistant ring is sleeved on the periphery of the piston sealing ring; the discharge end of the feeding machine is communicated to the slideway.

Preferably, a boss is arranged on the inner wall of one end, which is close to the extension of the injection head, of the slide way, and a spring is sleeved on the injection head between the boss and the piston sealing ring; the elasticity of the spring is smaller than the pressure of the discharge end of the feeder; the spring always pushes the injection head to retract into the formwork.

Preferably, one end of the injection head, which extends into the fixed die, is in the shape of an inverted circular truncated cone, and a discharge hole of the injection head is positioned on the lower bottom surface of the circular truncated cone; and a circular truncated cone-shaped accommodating hole matched with the end part of the injection head is formed in the outlet of the slide way.

Preferably, a discharge hole of the injection head is inwards sunken to form a counter bore, and the diameter of the counter bore is larger than that of the discharge hole; a plug is arranged on the counter bore, one end of the plug is fixed to the edge of the counter bore, and the diameter of the plug is larger than the discharge hole and smaller than the counter bore; the height of the plug is less than the depth of the counter bore.

Preferably, the slideway wall is provided with a blowing hole, the blowing hole is positioned at the outer side of one end of the injection head which is provided with the piston sealing ring when the injection head is completely retracted, and the blowing hole is provided with a one-way valve.

Preferably, heating wires are arranged in the fixed die and the moving die, and the heating wires in the moving die are arranged around the slide ways.

Preferably, the feeder comprises a feeding barrel, a screw conveyor and a heating cylinder, and the heating cylinder is sleeved outside the screw conveyor.

Preferably, the fixed die is vertically arranged, and the corresponding injection head vertically moves; and a mold inlet for the movable mold to enter and exit is formed in one side of the fixed mold, and a material taking port is formed in the bottom of the fixed mold.

Preferably, the movable die is vertically connected with the feeder in a sliding manner, a lifting cylinder is arranged at the bottom of the movable die, and the bottom of the lifting cylinder is fixed to the sliding base.

According to one embodiment of the disclosure, the high-precision mold injection molding machine breaks through the injection molding mode of the traditional injection molding machine, can provide injection molding of larger and more complex products, and has higher finished product qualification rate when the injection molding machine is used for injection molding of some molds with deep and fine holes.

Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description, serve to explain the principles of the invention.

Fig. 1 is a schematic structural diagram of a controllable high-precision mold injection molding machine according to an embodiment of the present invention.

Fig. 2 is a schematic structural diagram of the injection molding machine with a controllable high-precision mold according to the first embodiment of the invention.

Fig. 3 is a schematic diagram of the structure at a in fig. 2.

Fig. 4 is a schematic structural diagram of a slideway and an injection head of the controllable high-precision mold injection molding machine according to the first embodiment of the invention.

Fig. 5 is a schematic diagram of the structure at B in fig. 4.

Fig. 6 is a schematic structural diagram of a slideway and an injection head in a controllable high-precision mold injection molding machine according to a second embodiment of the present invention.

Fig. 7 is a schematic structural diagram of a controllable high-precision mold injection molding machine according to a third embodiment of the present invention.

Fig. 8 is a schematic structural diagram of the third embodiment of the invention when the injection molding machine is used for injection molding.

Detailed Description

Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise.

The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.

Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.

In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

Example one

As shown in fig. 1 to 5, the controllable high-precision mold injection molding machine in this embodiment includes a base 1100, a fixed mold 1200, a movable mold 1300, and an injection molding apparatus 1400, wherein the fixed mold 1200 and the injection molding apparatus 1400 are mounted on the base 1100, the movable mold 1300 is mounted on the injection molding apparatus 1400, the injection molding apparatus 1400 includes a supply machine 1410, a sliding base 1420, and a driving machine 1430, the sliding base 1420 is slidably connected to the base 1100, the supply machine 1410 is mounted on the sliding base 1420, the movable mold 1300 is mounted on a discharge end of the supply machine 1410, and the driving machine 1430 drives the sliding base 1420, so that the movable mold 1300 slides in or out of the fixed mold 1200; the movable mold 1300 comprises a mold shell 1310 and a plurality of injection heads 1320, wherein the mold shell 1310 is provided with a plurality of mutually parallel slide ways 1311, the injection heads 1320 have a certain length, the injection heads 1320 are slidably connected with the slide ways 1311, one end of the injection heads 1320 is connected to the discharge end of the feeding machine 1410, and the other end of the injection heads 1320 can extend out of the mold shell 1310 and extend into the elongated hole of the fixed mold 1200. The injection heads 1320 are arranged in a matrix on the moving mold 1300, and the denser the arrangement of the injection heads 1320 is, the better the injection effect is.

The injection head 1320 of this embodiment is in communication with the supply machine 1410, such as a channel provided in the mold housing 1310, or in communication with an external high temperature and pressure resistant conduit.

By the scheme in the embodiment, the movable die 1300 is inserted into the fixed die 1200, the injection head 1320 extends out and is inserted into the elongated hole of the fixed die 1200, and the injection distance can be reduced when the molten plastic is injected, so that the heat loss is reduced, the molten plastic can enter the elongated hole in a shorter time, and the solidification of the molten plastic in the injection process is prevented; the injection head 1320 can guide the injection, so that the molten plastic is prevented from solidifying because the molten plastic is not extruded into the elongated hole, and parts of the product are prevented from being lost; after the injection head 1320 is inserted into the hole, the injection head can preferentially inject gas into the hole bottom, so that the gas in the hole is exhausted, and the bubbles are prevented from being retained, thereby improving the quality of the product.

In this embodiment or other embodiments, a piston sealing ring 1321 is fixed to one end of the injection head 1320, which communicates with the discharge end of the supply machine 1410, and a wear ring (not shown in the drawings) is sleeved on the outer periphery of the piston sealing ring 1321; the discharge end of the supply machine 1410 is connected to the chute 1311. During injection molding, the pressure of the feeding machine 1410 can push the piston sealing ring 1321, so as to push the injection head 1320 to extend out of the movable mold 1300 and further into the hole of the fixed mold 1200, and the extension of the injection head 1320 can be completed without an external power device. The movable mold 1300 is provided with a material channel, the material channel is communicated to a discharge port of the feeding machine 1410, and the slide channels 1311 are communicated with the material channel.

In this embodiment or other embodiments, a boss 1312 is provided on an inner wall of the end of the slide 1311, which extends close to the injection head 1320, and a spring 1322 is sleeved on the injection head 1320 between the boss 1312 and the piston sealing ring 1321; the elasticity of the spring 1322 is smaller than the pressure of the discharge end of the feeding machine 1410; the spring 1322 always urges the syringe 1320 to retract the housing 1310. The spring 1322 can push the injection head 1320 back into the mold shell 1310 after the injection is completed; during injection, the pressure in the fixed die 1200 is the same as or similar to the pressure of the feeding machine 1410, so that the pressures on the two sides of the piston sealing ring 1321 are the same as or similar to each other, and the spring 1322 can push the injection head 1320 to slowly retract into the mold shell 1310, thereby preventing the injection head 1320 from retracting in time during injection, and preventing the occurrence of the situations of insufficient filling and the like of products.

In this embodiment or other embodiments, one end of the injection head 1320, which extends into the fixed die 1200, is in an inverted circular truncated cone shape 1323, and a discharge hole of the injection head 1320 is located on a lower bottom surface of the circular truncated cone; the outlet of the slideway 1311 is provided with a circular truncated cone-shaped accommodating hole 1313 matched with the end of the injection head. The injection head 1320 is made flush with the surface of the movable mold 1300 when retracted, and a protrusion block is prevented from remaining on the surface of the product on the movable mold 1300 side when injection molding is completed. The injection head 1320 is arranged in an inverted circular truncated cone shape, so that the smoothness of the surface of the movable mold 1300 can be guaranteed, the stress area of the end part of the injection head 1320 can be increased, and the injection head 1320 can be applied with larger pressure by the plastic in a molten state to help the plastic to retract into the movable mold 1300.

In this or other embodiments, the discharge port of the injection head 1320 is recessed inward to form a counterbore, and the diameter of the counterbore is larger than that of the discharge port; a plug 1324 is arranged on the counter bore, one end of the plug 1324 is fixed to the edge of the counter bore, and the diameter of the plug 1324 is larger than that of the discharge hole and smaller than that of the counter bore; the height of the plug 1324 when covering the discharge hole is smaller than the depth of the counter bore. The arrangement can ensure that when the injection head 1320 abuts against the inner surface of the fixed die 1200, the plug 1324 blocks the discharge hole, only the injection head 1320 which is positioned in the elongated hole and does not abut against the surface of the fixed die 1200 is injected firstly, the hole is filled, and molten plastic is prevented from flowing into the hole from the outer side when the injection heads 1320 outside other holes are injected, so that air is prevented from being discharged; after the injection molding of the elongated hole is completed, the movable mold 1300 drives the abutted injection head 1320 to move away from the surface of the fixed mold 1200, and then the injection is started;

in this embodiment or other embodiments, heating wires (not shown) are disposed in the fixed mold 1200 and the movable mold 1300, and the heating wires in the movable mold 1300 are disposed around the slide 1311. The mold is ensured to have certain temperature, and the molten plastic is prevented from being solidified before the injection molding is finished.

In this embodiment or other embodiments, the feeder 1410 includes a feeding barrel 1411, a screw conveyor 1413, and a heating cylinder 1412, and the heating cylinder 1412 is sleeved outside the screw conveyor 1413, so that plastics can be melted during a material conveying process, thereby improving work efficiency. The driver 1430 is a servo motor, and is screwed to the slide base 1420 via a screw, whereby accuracy can be improved.

The injection molding machine further comprises a control device (not shown in the figure), wherein the control device comprises a processor, a memory, a communication module, an input/output module and the like, and the processor is one or more of a PLC, a singlechip, a microcomputer, a mobile terminal and the like.

The controllable high-precision mold injection molding machine in the embodiment is a horizontal injection molding machine, and the fixed mold and the movable mold are transversely arranged. When the injection molding device is used, the driving machine pushes the sliding base to move towards the fixed die, the movable die slides into the fixed die under the driving of the injection molding mechanism, and the movable die is fixed or continuously extends to be in contact with the inner surface of the fixed die; starting the injection molding mechanism, enabling the injection head to move out of the slide way under the pressure of molten plastic and enter the hole in the surface of the fixed mold, enabling the shallow hole to abut against the injection head, starting injection by the injection head in the deep hole due to no abutting, and enabling the movable mold to slowly move outwards under the driving of the injection molding mechanism until the hole is full of injection, enabling the injection heads to leave contact with the fixed mold one by one and start injection, and enabling the injection heads to retract into the movable mold under the action of pressure in the cavity of the fixed mold and the action of the spring and to be flush with the movable mold; and the moving die stops moving after reaching a preset position in the fixed die cavity until the injection is finished. And after cooling and shaping, moving the movable mold out of the fixed mold, and taking out the product.

Example two

As shown in fig. 6, compared with the technical solutions in the above embodiments, the controllable high-precision mold injection molding machine in this embodiment is different in that a gas blowing hole 1330 is further disposed on an inner wall of the chute 1311, the gas blowing hole 1330 is located outside an end of the injection head 1320 where the piston sealing ring 1321 is disposed when the injection head 1320 is completely retracted, and a check valve 1331 is disposed on the gas blowing hole 1330. After the injection molding is finished, air is blown into the slide 1311 through the air blowing holes 1330, so that the molten plastic remained in the slide 1311 is blown out, and cleaning operation after the injection molding is finished is facilitated.

EXAMPLE III

As shown in fig. 7 and 8, compared with the technical solutions in the two embodiments, the controllable high-precision mold injection molding machine in this embodiment has the difference that the fixed mold 1200 is vertically disposed, and the corresponding injection head 1320 vertically moves; a mold inlet 1210 for the movable mold 1300 to enter and exit is formed in one side of the fixed mold 1200, and a material taking port 1220 is formed in the bottom of the fixed mold 1200. In use, the movable mold 1300 is slid into the stationary mold 1200 from the side, the feeder 1410 is started, the injection head 1320 is extended, and injection molding is started. After injection molding is completed, the movable mold 1300 is moved out of the fixed mold, and the product is moved out of the material taking port 1220 under the action of self gravity or the action of the demolding device, so that the product can be taken out conveniently.

In this embodiment or other embodiments, the movable mold 1300 is vertically slidably connected to the feeding machine 1410, a lifting cylinder 1340 is disposed at the bottom of the movable mold 1300, and the bottom of the lifting cylinder 1340 is fixed to the sliding base 1420. The movable mould 1300 and the feeder 1410 are connected through a high-temperature-resistant hose (the temperature of the molten plastic is 180 ℃ to 200 ℃ generally, and the high-temperature-resistant rubber tube can bear the high temperature of about 300 ℃ in a short time), or a vertical groove is formed in the side surface of the movable mould 1300, the vertical groove is communicated with a material channel in the movable mould 1300, a discharge port of the feeder 1410 is communicated with the vertical groove, a sealing strip is arranged on the peripheral surface of the vertical groove, the side surface of the movable mould 1300 vertically slides with one end of the feeder 1410, and therefore the discharge port of the feeder is communicated with the material channel in the movable.

The controllable high-precision mold injection molding machine in the embodiment is a vertical injection molding machine, a fixed mold and a movable mold are vertically arranged, the movable mold horizontally moves, enters the fixed mold, extends into a fixed mold cavity under the lifting of a lifting cylinder, starts an injection mechanism, an injection head moves out of a slide way under the pressure of molten plastic, enters holes in the surface of the fixed mold, shallow holes abut against the injection head, the injection head in the deep holes starts injection due to the fact that the injection head does not abut against the injection head, the movable mold slowly moves downwards under the driving of the lifting cylinder after the holes are fully injected, the injection head leaves the contact with the fixed mold one by one, the injection head starts injection, the injection head retracts into the movable mold under the action of the pressure in the fixed mold cavity and the action of a spring and is flush with the movable mold; and the moving die stops moving after reaching a preset position in the fixed die cavity until the injection is finished. And after cooling and shaping, moving the movable mold downwards out of the mold cavity of the fixed mold, horizontally moving the movable mold out of the fixed mold, and taking out the product.

Although some specific embodiments of the present invention have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustrative purposes only and are not intended to limit the scope of the present invention. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.

Claims

1. A controllable high-precision mold injection molding machine comprises a machine base, a fixed mold, a movable mold and an injection molding device, wherein the fixed mold and the movable mold are vertically arranged, the fixed mold and the injection molding device are installed on the machine base, and the movable mold is installed on the injection molding device; the movable mould comprises a mould shell and a plurality of injection heads, a plurality of mutually parallel slideways are arranged on the mould shell, the injection heads have a certain length and are in sliding connection with the slideways, one ends of the injection heads are communicated to the discharge end of the feeding machine, the other ends of the injection heads can extend out of the mould shell and extend into holes in the fixed mould, the movable mould is in vertical sliding connection with the feeding machine, a lifting cylinder is arranged at the bottom of the movable mould, and the bottom of the lifting cylinder is fixed to the sliding base.

2. The controllable high-precision mold injection molding machine according to claim 1, wherein said injection molding machine comprises a control device, said control device acting on said driving machine to drive said driving machine to work.

3. An injection molding method using the injection molding machine according to any one of claims 1 and 2, characterized in that the movable mold moves horizontally, enters the fixed mold, and extends into the fixed mold cavity under the lifting of the lifting cylinder, the injection mechanism is started, the injection head moves out of the slide way under the pressure of the molten plastic and enters the holes on the surface of the fixed mold, the shallower hole abuts against the injection head, the injection head located in the deeper hole starts injection, after the holes are fully injected, the movable mold moves downwards slowly under the driving of the lifting cylinder, so that the injection heads leave the contact with the fixed mold one by one and start injection, the injection head retracts into the movable mold under the action of the pressure in the fixed mold cavity and the action of the spring, the movable mold stops moving after reaching the specified position in the fixed mold cavity, until the injection is completed, after cooling and shaping, the movable mold moves downwards out of the fixed mold cavity and moves out of the fixed mold horizontally.

4. The injection molding method according to claim 3, wherein the injection head is retracted into the movable mold flush with the surface of the movable mold by the pressure in the cavity of the stationary mold and by the spring.

5. The injection molding method according to claim 3, wherein heating wires are arranged in the fixed mold and the moving mold, the heating wires in the moving mold are arranged around the slide way, and the heating wires are continuously heated during the manufacturing process.

6. The injection molding method according to claim 3, wherein the feeder comprises a feeding barrel, a screw conveyor and a heating cylinder, the heating cylinder is sleeved outside the screw conveyor, and the plastic is melted during feeding.