JP2013103492A - Injection molding apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an injection molding apparatus that is miniaturized and can manufacture the molding of a desired accuracy by easy control.SOLUTION: When a feed gear part rotates to an anti-clockwise direction, the tooth of a feed gear part cuts into a plate molding material S1, and sends the plate molding material S1 toward a through-hole 40 of the injection cylinder 39. The plate molding material S1 that enters the through-hole 40 is dissolved by a heater 44 at the tip of an injection cylinder 39 and becomes flowable material P that has the flowability. Then, the flowable material P is pushed into cavity 41 by the proceeding of the plate molding material S1. That is, the plate molding material S1t becomes a piston and push the dissolved hot-water flowable material P and injects it into the cavity 41.

Description

  The present invention relates to a compact and simplified injection molding apparatus.

  In a conventional injection molding apparatus, as described in Patent Document 1, a synthetic resin molding material is charged in a pellet or the like from a hopper, plasticized and melted in a heating cylinder, and then conveyed by a screw. It is injected into the mold cavity and molded. Then, after the molded product is solidified, the mold is opened and the molded product is pushed out by an ejector pin.

  In such an injection molding apparatus, the heating cylinder and the mold are separate bodies, and the device from the control surface of the structure and molding conditions is devised independently to achieve optimum performance for each, As the entire apparatus becomes larger, the control of molding conditions has become complicated.

JP 2008-302634 A

Recently, the time and effort required to transport molded products has become a problem, and it is also proposed to eliminate the transportation itself by allowing each end user to manufacture as many molded products as necessary. Has been. However, since the conventional injection molding apparatus is large as described above, it is difficult to respond to this proposal.
The present invention has been made by paying attention to the above-mentioned conventional problems, and is capable of producing a molded product having a desired accuracy with a simple control while being miniaturized. An object of the present invention is to provide an injection molding apparatus that can be used.
Another object of the present invention is to propose a flat molding material suitable for the above-described injection molding apparatus.

  The present invention has been made to solve the above-mentioned problems, and the invention of claim 1 is directed to a mold comprising a fixed mold and a movable mold that forms a cavity together with the fixed mold, and a front end opening is the mold. An injection cylinder into which the plate-shaped molding material is fed, heating means for generating a temperature gradient that rises as the cavity approaches the inside of the injection cylinder, and a plate-shaped molding material in the injection cylinder A molding material pushing means for pushing the material toward the cavity, and when the flat molding material is pushed in by the molding material pushing means, the injection material is injected into the cavity by the melted and fluidized material immediately before the cavity. In the apparatus, the molding material pushing means causes the flat plate-shaped molding material to travel toward the injection cylinder, completely dissolves in the injection cylinder and pushes it into the cavity. An injection molding apparatus characterized by writing.

  According to a second aspect of the present invention, in the injection molding apparatus according to the first aspect, the molding material pushing means rotates in a state of being in contact with the flat plate-shaped molding material, and rotates to send the material, and to rotate the rotating disk It is an injection molding device characterized in that it is constituted by an applying means.

  A third aspect of the present invention is the injection molding apparatus according to the second aspect, wherein the rotating disk is a gear.

  A fourth aspect of the present invention is the injection molding apparatus according to the second or third aspect, wherein a plurality of rotating disks are provided, and the plurality of rotating disks rotate synchronously. .

  The invention of claim 5 is a flat plate-shaped molding material to be supplied to the injection cylinder of the injection molding apparatus according to any one of claims 1 to 4, which has a long flat plate shape and extends in the longitudinal direction. The flat molding material is characterized in that a concavo-convex portion is formed.

  The invention of claim 6 is a flat plate-shaped molding material to be supplied to the injection cylinder of the injection molding apparatus according to any one of claims 1 to 4, which has a long flat plate shape and extends in the width direction. The flat molding material is characterized in that a concavo-convex portion is formed.

  The invention according to claim 7 is the flat plate-shaped molding material according to claim 6, wherein the concavo-convex portions are formed continuously, and the flat plate-shaped molding material has a rack shape. .

  According to the injection molding apparatus of the present invention, a molded product with a desired accuracy can be manufactured with a small size and simple control.

1 is a perspective view of an injection molding apparatus according to an embodiment of the present invention. It is a side view of the injection molding apparatus of FIG. It is a longitudinal cross-sectional view of the injection molding apparatus of FIG. It is a figure which shows the state which the tooth | gear of the feed gear part mounted in the injection molding apparatus of FIG. 1 bites into flat plate-shaped molding material. It is a figure for demonstrating operation | movement of the injection molding apparatus of FIG. It is a figure for demonstrating operation | movement of the injection molding apparatus of FIG. It is a figure for demonstrating operation | movement of the injection molding apparatus of FIG. It is a figure for demonstrating operation | movement of the injection molding apparatus of FIG. It is a perspective view of the metal mold | die and injection cylinder of the injection molding apparatus of FIG. It is a front view which shows the state by which the flat molding material was inserted in the insertion port of the injection cylinder of the injection molding apparatus of FIG. (A), (B), and (C) are perspective views of different types of flat plate-shaped molding materials.

An injection molding apparatus 1 according to an embodiment of the present invention will be described with reference to the drawings.
1 and 2, reference numeral 3 denotes a base, and a molding material feeding device 2 as a molding material pushing means is provided on the upper surface of the base 3. The configuration of the molding material feeder 2 will be described.
A support block 5 is fixed to the base 3, and a guide groove 6 that is recessed in a flat plate shape is formed on the upper surface of the support block 5. The guide groove 6 is in the middle in the left-right width direction and extends in the longitudinal direction. As shown in FIG. 3, a pressing plate 8 is fixed to the support block 5, and the pressing plate 8 closes the upper surface of the central portion of the guide groove 6.

  Support plates 7 and 9 are fixedly provided on the left and right sides of the support block 5. Shafts 11 and 13 are provided on the support plates 7 and 9 so as to be rotatably supported. The shafts 11 and 13 are parallel to each other with a space therebetween and are provided at the same height. A rotating body 15 is fixed to the shaft 11, and a rotating body 17 is fixed to the shaft 13.

The rotating body 15 includes a core portion 15a, a feed gear portion 15b as a rotating disk fixed to the core portion 15a, and a power transmission gear 15c. The rotator 17 has the same shape as the rotator 15, and includes a core portion 17a, a feed gear portion 17b as a rotating disk fixed to the core portion 17a, and a power transmission gear 17c.
As shown in FIG. 3, the feed gear portions 15 b and 17 b are located on both sides in the longitudinal direction with the above-described presser plate 8 interposed therebetween, and the teeth 15 h and 17 h of the feed gear portions 15 b and 17 b slightly enter the guide groove 6. It is out.

A shaft 19 is provided between the support plates 7 and 9 and is rotatably supported. An intervention gear 21 is fixed to the shaft 19. The interposed gear 21 meshes with the power transmission gear 15c of the rotating body 15 and the power transmission gear 17c of the rotating body 17, respectively.
An extension shaft 23 is connected to the shaft 11 on the rotating body 15 side, and the extension shaft 23 protrudes outward from the hole 24 of the support plate 7. The central portion of the long shaft 26 of the handle 25 is fixed to the portion of the extension shaft 23 that protrudes to the outside of the support plate 7. Grips 28 are attached to both ends of the shaft 26.
The rotational force applying means includes shafts 11 and 13, rotating bodies 15 and 17, shaft 19, intervening gear 21, extension shaft 23, and handle 25.

A mold 27 is provided on the other end portion of the upper surface of the base 3. The configuration of the mold 27 will be described.
The mold 27 includes a fixed mold 29 and a movable mold 31. The fixed mold 29 is fixed to the base 3, and a concave portion 32 is formed in the fixed mold 29. A gate 34 communicates with the recess 32.
A support base 33 is erected on the base 3, and four guide shafts 35 are fixed to the support base 33. A movable mold 31 is movably supported on the guide shaft 35, and the movable mold 31 can be moved close to and away from the fixed mold 29. The movable die 31 is formed with a convex portion 37 that faces the concave portion 32 of the fixed die 29.
When the mold 27 is clamped, a cavity 41 is formed in the gap between the convex portion 37 of the movable mold 31 and the concave portion 32 of the fixed mold 29. The cavity 41 is molded according to the shape of the molded product.
An ejector pin 38 is also fixed to the support base 33, and the ejector pin 38 penetrates the movable die 31.

Reference numeral 39 denotes an injection cylinder, and the injection cylinder 39 is lifted and supported by a support member 42. The injection cylinder 39 is formed with an insertion hole 40 through which a flat molding material S1, S2, S3, which will be described later, can be inserted with a slight gap, and this insertion hole 40 penetrates in the axial direction which is the longitudinal direction. .
One end of the injection cylinder 39 is connected to the fixed mold 29, and the distal end side opening 40 a of the insertion hole 40 communicates with the cavity 41 through the gate 34 of the fixed mold 29.

In the injection cylinder 39, about one third of the portion 39a on the gate 34 side when viewed from the axial direction is formed of iron (Fe) having good heat retention, that is, heat conductivity is relatively poor, and the other portion 39b is heat dissipation. It is made of aluminum (Al) having good properties, that is, heat conductivity is relatively good.
The injection cylinder 39 is provided with a heater 44, and the heater 44 is wound around and fixed to the outer peripheral surface of the injection cylinder 39.

The movable mold 31 is provided with a gate blocking device 43. The structure of the gate interruption | blocking apparatus 43 is demonstrated according to FIG.
Reference numeral 45 denotes a rocking plate. The rocking plate 45 is supported so as to be rockable about a support shaft 47 as a fulcrum. The swing plate 45 is urged clockwise by a spring (not shown).
The movable die 31 has a communication hole 49 communicating with the gate 34, and a slide plate 51 is slidably accommodated in the communication hole 49. One end of the slide plate 51 is connected to the upper end of the swing plate 45. Further, a communication hole 53 that communicates with the cavity 41 is formed in the movable mold 31, and a slide plate 55 is slidably accommodated in the communication hole 53. One end of the slide plate 55 is connected to the lower end of the swing plate 45.

Next, the flat molding materials S1, S2, and S3 will be described. The flat molding materials S1, S2, and S3 are all made of a heat-meltable synthetic resin.
A plurality of concave and convex portions S1a extending in the longitudinal direction are formed on the upper surface of the flat plate-shaped molding material S1 shown in FIG.
A large number of concavo-convex portions S2a extending in the width direction are provided on the upper surface of the flat plate-shaped molding material S2 shown in FIG.
The upper surface of the flat plate-shaped molding material S3 shown in FIG. 3C is flat and has no irregularities.

Next, the manual operation of the injection molding apparatus 1 and the forming process of the molded product M will be described.
First, the flat molding material S <b> 1 is inserted into the guide groove 6 of the support block 5. And the grip 28 is grasped and the handle | steering-wheel 25 is rotated, and the feed gear part 15b and the power transmission gear 15a are rotated in the counterclockwise direction with the shaft 11. FIG. This rotational force is transmitted to the intervening gear 21, and the rotational force is transmitted from the intervening gear 21 to the power transmission gear 17c. Then, in synchronization with the feed gear portion 15b, the feed gear portion 17b together with the shaft 13 rotates in the counterclockwise direction in FIG.
When the feed gear portions 15b and 17b rotate counterclockwise, the teeth 15h and 17h bite into the flat plate-shaped molding material S1 as shown in FIG. 4, and the feed gear portions 15b and 17b rotate in this state. The flat molding material S <b> 1 is fed toward the insertion hole 40 of the injection cylinder 39.

As shown in FIG. 5, the flat molding material S <b> 1 that has entered the insertion hole 40 is melted at the tip portion 39 a of the injection cylinder 39 by the heater 44 to become a fluid material P having fluidity.
As described above, the injection cylinder 39 is formed of iron (Fe) having good heat retention at the end portion 39a, which is about one third of the gate 34, close to the gate 34, and the other portion 39b has good heat dissipation. Since it is formed of aluminum (Al), the flat plate-shaped molding material S1 is completely dissolved only at the tip portion 39a of the injection cylinder 39. In the figure, the molding material is divided into two parts, a completely dissolved part and other parts, and it is drawn as if it was completely dissolved suddenly at a certain point, but this is for the convenience of visual recognition. In the injection cylinder 39, melting gradually proceeds toward the mold 27 side.

Then, as shown in FIG. 6, the flowable material P is pushed into the cavity 41 by the progress of the flat molding material S <b> 1. In other words, the flat plate-shaped molding material S1 serves as a piston and pushes the melted hot fluid material P into the cavity 41.
The gas generated in the cavity 41 passes through the gate 34 and is further conveyed to the inlet of the injection port 40 through a gap between the concave portion (groove) of the concave and convex portion S1a of the flat plate-shaped molding material S1 and the inner surface of the injection cylinder 39. From there, it is discharged to the outside (see FIGS. 9 and 10). Therefore, the gas generated in the cavity 41 can be reliably discharged, and the occurrence of defects in the molded product can be prevented.

  As shown in the enlarged view of FIG. 3, when the pressure of the fluid material P in the cavity 41 exceeds a certain level, the slide plate 55 slides in the direction of the swing plate 45, and the swing plate 45 moves in the counterclockwise direction. Rotate. As a result, the slide plate 51 protrudes to the gate 34, shuts off the gate 34, and restricts the flowable material P from flowing into the cavity 41 any more. Therefore, the amount of the flowable material P injected into the cavity 41 is finely adjusted to an appropriate value for forming the molded product M. When the pressure of the fluid material P in the cavity 41 becomes a certain level or less, the swing plate 45 is rotated clockwise by the biasing force of a spring (not shown), and the slide plate 51 is retracted from the gate 34. Thus, the gate 34 and the cavity 41 are in communication.

When the injection of the flowable material P into the cavity 41 is completed, a buzzer (not shown) sounds and a timer (not shown) starts measuring time.
Since the buzzer sounds again after a predetermined time has elapsed, as shown in FIG. 7, when the operator waits for it and opens the mold, when the movable mold 31 moves backward and separates from the fixed mold 29, the fluid material P The molded product M formed by the solidification is separated from the fixed mold 29 and exposed. When the movable die 31 is further retracted, as shown in FIG. 8, the ejector pin 38 protrudes relatively, and the molded product M is also separated from the movable die 31. Therefore, the molded product M supported only by the ejector pin 38. Pick up with your finger and take it out. And after closing the metal mold | die 27, said operation | work is repeated. In this way, the molded products are manufactured sequentially.

  According to the injection molding apparatus 1, since the flat molding material S <b> 1 having a predetermined size is used, plasticization, kneading, and further measurement are not necessary, and temperature control of the entire apparatus is performed only by temperature control of the heater 44. Be able to. Therefore, the apparatus has been greatly reduced in size and simplified in control.

The molded product M may be formed using a flat plate-shaped molding material S2 shown in FIG. 11B instead of the flat plate-shaped molding material S1. When the flat plate-shaped molding material S2 is used, a large number of concavo-convex portions S2a extending in the width direction mesh with the teeth 15h and 17h of the feed gear portions 15b and 17b so that the flat plate-shaped molding material S2 can be securely attached like a rack and a pinion. Can be sent.
The flat molding material S3 shown in FIG. 5C can also be used in the same manner as the flat molding material S1.

  The embodiment of the present invention has been described in detail above. However, the specific configuration is not limited to this embodiment, and the present invention can be changed even if there is a design change without departing from the gist of the present invention. included.

  INDUSTRIAL APPLICABILITY The present invention is applicable to a manufacturing industry that uses a molding material to manufacture a molded product by injection molding.

DESCRIPTION OF SYMBOLS 1 ... Injection molding apparatus 2 ... Molding material feeding apparatus 3 ... Base 5 ... Support block 6 ... Guide groove 7, 9 ... Support plate 8 ... Holding plate 11, 13 ... Shaft 15, 17 ... Rotating body 15a, 17a ... Core part 15b , 17b ... feed gear portion 15h, 17h ... (feed gear portion) teeth 15c, 17c ... power transmission gear 19 ... shaft 21 ... intermediate gear 23 ... extension shaft 24 ... support plate hole 25 ... handle 26 ... shaft 28 ... Grip 27 ... Mold 29 ... Fixed mold 31 ... Movable mold 32 ... (fixed mold) recess 33 ... Support base 34 ... Gate 35 ... Guide shaft 37 (movable mold) convex section 38 ... Ejector pin 39 ... Injection cylinder 39a ... Tip portion 39b of injection cylinder: Other portion 40 of injection cylinder ... Insertion hole 40a ... Opening side opening 41 of insert hole ... Cavity 42 ... Support member 43 ... Gate blocking device 45 ... Oscillating plate 47 ... Support shaft 49 ... Communication hole 51 ... Slide plate 53 ... Communication hole 55 ... Slide plate S1, S2, S3 ... Flat plate molding material P ... Flowable material S1a ... Longitudinal direction of flat plate molding material S1 Concavo-convex parts extending to S2a ... many concavo-convex parts extending in the width direction of the flat molding material S2

Claims (7)

  A mold composed of a fixed mold and a movable mold that forms a cavity together with the fixed mold, a tip side opening communicating with the cavity of the mold, and an injection cylinder into which a plate-shaped molding material is fed; Heating means for generating a temperature gradient that increases in temperature as it approaches the cavity, and molding material pushing means for pushing a flat molding material into the cavity in the injection cylinder, and flat molding by the molding material pushing means In the injection molding apparatus in which when the material is pushed, the melted and fluidized material immediately before the cavity is injected into the cavity, the molding material pushing means causes the flat molding material to travel toward the injection cylinder. An injection molding apparatus characterized by being completely melted in the injection cylinder and pushed into a cavity   2. The injection molding apparatus according to claim 1, wherein the molding material pushing means is composed of a rotating disk that rotates in contact with a flat molding material and feeds the material, and a rotational force imparting means that rotates the rotating disk. An injection molding apparatus characterized by that.   The injection molding apparatus according to claim 2, wherein the rotating disk is a gear.   The injection molding apparatus according to claim 2 or 3, wherein a plurality of rotating disks are provided, and the plurality of rotating disks rotate synchronously.   It is a flat plate-shaped molding material supplied to the injection cylinder of the injection molding device according to any one of claims 1 to 4, has a long flat plate shape, and has an uneven portion extending in the longitudinal direction. A flat molding material characterized by   A flat plate-shaped molding material to be supplied to the injection cylinder of the injection molding apparatus according to any one of claims 1 to 4, wherein the flat plate-shaped molding material has a long flat plate shape, and a large number of uneven portions extending in the width direction are formed. A flat molding material characterized by comprising:   7. The flat plate-shaped molding material according to claim 6, wherein the concavo-convex portions are formed continuously, and the flat plate-shaped molding material has a rack shape.

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