JP6009313B2 - Resin molding equipment and molded product manufacturing equipment - Google Patents

Description

  The present invention relates to a resin modeling apparatus that has a simple mechanism and can be miniaturized, and a molded article manufacturing facility that combines an injection molding apparatus with the resin modeling apparatus.

There are so-called plunger type injection molding apparatuses. This system has a simple mechanism, but in order to secure the injection pressure, it is necessary to manufacture the plunger head to be inserted into the injection cylinder with high dimensional accuracy and minimize the gap between the head and the inner diameter of the injection cylinder. There is.
If the gap between the plunger head and the inner surface of the injection cylinder becomes too large, the plunger will push the molten molding material in the injection cylinder into the mold and resist the thermal expansion of the molten molding material. It is difficult to secure a sufficient injection pressure, which adversely affects the dimensional accuracy of the molded product. On the other hand, if the gap between the plunger head and the inner surface of the injection cylinder is too small, the molten molding material in the injection cylinder by the plunger When the plunger centering is slightly displaced when the mold is pushed into the mold, the plunger head cuts the metal inner surface of the injection cylinder and pushes the molding material dissolved with the metal powder into the mold. This is because the quality of the molded product is adversely affected.

However, it is difficult to manufacture the head with high dimensional accuracy as expected in consideration of the manufacturing cost currently allowed.
Therefore, recently, an in-line screw type apparatus using a screw for pushing a molten molding material into a mold has become mainstream.

On the other hand, the applicant of the present invention previously described in Patent Document 1 has a configuration in which a vertical injection cylinder is provided with a temperature gradient in which the temperature increases downward, and a mold is provided below the injection cylinder. The arranged one was proposed as an injection molding device. In this injection molding apparatus, the stick-shaped molding material is supplied to the injection cylinder in a row from above, and the supplied molding material is completely injected from the solidification toward the nozzle tip on the mold side. Since it continuously changes to a molten state, when the molding material is pushed from the upper side, a part of the lower molten molding material still rises between the solid upper molding material and the inner surface of the injection cylinder, to some extent It is cooled and solidified again to fill the gap around the solid molding material and create a tight seal that will not be damaged even if it slides in the injection cylinder. It is used as a head.
According to this injection molding apparatus, a molded product with a desired accuracy can be manufactured while being able to be miniaturized with a relatively simple mechanism.

JP 2012-30429 A

In Patent Document 1, as described above, it is necessary to supply a stick-shaped molding material as a raw material.
Thus, conventionally, in the case of producing a molded product, whether it is a plunger method or an in-line screw method, a pellet-shaped resin is injected as a raw material into an injection molding device to form a final molded product. In the first place, there was no idea to manufacture such products.
For this reason, development of a resin modeling apparatus that models a stick-shaped molding material from raw materials is required. However, the mechanism and control become complicated. From the viewpoint of manufacturing cost and labor, the injection of Patent Document 1 is required. The advantage of the molding apparatus is offset.

Then, this invention is made paying attention to the said conventional problem, and it aims at providing the new and effective resin modeling apparatus which can manufacture a stick-shaped molding material.
Moreover, this invention makes it the objective to provide the molded article manufacturing equipment which combined the injection molding apparatus of patent document 1 with the above-mentioned resin modeling apparatus.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and the invention of claim 1 is directed to a modeling part including a plurality of cavities extending in the axial direction and open at both ends in the axial direction, and the modeling part as an axis. Rotating means for rotating around, a flat plate-like closing portion that is fixed opposite to both axial ends of the modeling portion, and closes the cavity portion, and is formed on one of the closing portions, A supply hole that communicates with one of the hollow portions, a discharge hole that is formed in one or the other of the closed portions and communicates with another one of the hollow portions of the modeling portion, and a resin supply that supplies molten resin from the supply holes And a shaped product discharge means for discharging a shaped product from the discharge hole, and when the one of the supply hole and the hollow portion communicates with the rotation of the shaping portion, the supply from the resin supply means to the hollow portion Molten resin is supplied through the holes By cavity immediately after the molten resin is filled is supplied is relatively moved with respect to the plate surface of the closure portion formed of the supply holes, the molten resin is sheared, the resin has been supplied When the hollow portion and the discharge hole communicate with each other, the molded article solidified from the hollow portion is discharged through the discharge hole.

  According to a second aspect of the present invention, there is provided the resin molding apparatus according to the first aspect, wherein the molded product discharge means includes an insertion hole formed in the closed portion so as to face the discharge hole in the axial direction, and from the insertion hole to the molding unit. The resin modeling apparatus is configured by a plunger that enters the hollow portion and moves in a freely reciprocating manner, and the shaped product is discharged through the discharge hole by the advance of the plunger.

  The invention according to claim 3 is the resin molding apparatus according to claim 1 or 2, wherein the resin supply means comprises a heating cylinder provided with a screw, and is in the form of a pellet charged into the heating cylinder. The resin is transferred while being melted by the rotation of the screw, and is supplied to the cavity of the modeling part.

  A fourth aspect of the present invention is the resin molding apparatus according to any one of the first to third aspects, wherein the supply hole and the discharge hole face each other in the horizontal direction.

  A fifth aspect of the present invention is the resin molding apparatus according to any one of the first to fourth aspects, wherein the modeling unit is provided with a cooling means.

  According to a sixth aspect of the present invention, in the resin modeling apparatus according to any one of the first to fifth aspects, the hollow portion of the modeling portion has a substantially columnar shape, and a large number of the inner peripheral surface extends parallel to the axial direction. It is the resin modeling apparatus characterized by the above-mentioned.

  The invention of claim 7 is a molded article manufacturing facility comprising the resin shaping apparatus according to any one of claims 1 to 6 and an injection molding apparatus, wherein the lower end of the injection molding apparatus is a nozzle. A vertical injection cylinder, a heating means for generating a temperature gradient that rises from the top to the bottom inside the injection cylinder, and a push-in shaft that pushes the molding material downward in the injection cylinder And a molded product manufactured by supplying a molded product manufactured by the resin modeling apparatus to the injection cylinder as a molding material.

  The resin molding apparatus of the present invention can be designed to be compact and relatively simple with a relatively simple mechanism, and is suitable for manufacturing a stick-shaped molding material used in the injection molding apparatus of Patent Document 1.

It is a perspective view of the resin modeling apparatus which concerns on embodiment of this invention. It is the perspective view seen from the other direction of the resin modeling apparatus of FIG. It is a front view of the resin modeling apparatus of FIG. It is a top view of the resin modeling apparatus of FIG. It is KK sectional drawing of FIG. It is CC sectional drawing of FIG. It is OO sectional drawing of FIG. It is a perspective view of the molded article manufactured with the resin modeling apparatus of FIG. It is explanatory drawing of the manufacture process of the molded article of FIG. 8 by the resin modeling apparatus of FIG. 1 is a perspective view of an injection molding apparatus according to an embodiment of the present invention. It is explanatory drawing of the manufacture process of the molded article by the injection molding apparatus of FIG. It is explanatory drawing of the manufacturing process of the molded article following FIG. 11 by the injection molding apparatus of FIG.

A resin 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 rectangular base plate, and the base plate 3 is lifted and supported by a plurality of legs 5. A resin molding mechanism is mounted on the base plate 3 and will be described below with reference to FIGS.

  First, the resin supply means will be described. Reference numeral 7 shown on the lower left side in FIG. A frame-shaped holding portion 9 opened in the left-right direction is placed on the fixed base 7. A connecting shaft 11 extending upward from the fixed base 7 is passed through the holding portion 9, and a spring 13 is wound around a portion protruding above the connecting shaft 11 as shown in FIG. 3. . The holding portion 9 is elastically biased downward by a spring 13.

  Reference numeral 15 denotes a screw driving motor. The screw drive motor 15 is attached to the holding portion 9 described above, and the axial direction of the rotary shaft 17 is the left-right direction (see FIGS. 1 and 2). As shown in FIG. 4, the rotary shaft 17 is connected to the screw 21 via the universal joint 19. When the screw driving motor 15 is driven, the screw 21 rotates about the axis.

The screw 21 is for a so-called resin extruder. As shown in FIG. 5, the flight portion 25 is inserted into a cylinder 29 while being rotatably supported by a bearing 27. A die head 31 is connected to the tip end side of the cylinder 29, and a supply hole 33 communicates with the inside of the cylinder 29.
The cylinder 29 is lifted and supported by the holding portion 35 so that the axial direction is horizontal, and the above-described bearing 27 is attached to the holding portion 35. A hopper 37 (not shown in FIGS. 3 to 5) for charging pellet-shaped resin, which is a raw material, is continuously provided in the holding portion 35. An opening is formed in the cylinder 29 corresponding to the lower end opening of the hopper 37, and the raw material pellet resin falls from the hopper 37 and is put into the cylinder 29.

  Reference numeral 39 designates a cylindrical heater. The cylindrical heater 39 surrounds the cylinder 29 from the outside at a suitable distance from the hopper 37 and forms a heating cylinder, and gradually heats the resin in the cylinder 29 by applying heat. To melt. When the cylindrical heater 39 is turned on, the cylinder 29 may expand on the screw drive motor 15 side due to heat, but is connected to the screw drive motor 15 side by the universal joint 19, and the screw drive motor 15 is connected to the spring 13. Since the relative position movement is possible, the motor side is not affected.

  The resin supply means is configured as described above, and when the pellet-shaped resin is put into the cylinder 29 from the hopper 37, it falls onto the flight part 25 during the rotation of the screw 21, and from the cylindrical heater 39. While being melted by receiving the heat, it is pushed by the flight unit 25 and sent to the die head 31 side.

In parallel with the above-described resin supply means, a shaped article discharge means is installed.
Reference numeral 41 denotes a holding portion, which is directly fixed on the base plate 3. The cylinder 45 of the electric actuator 43 is attached to the holding portion 41, and the axial direction of the plunger 47 protruding and retracting from the cylinder 45 is the left-right direction (see FIGS. 1 and 2).

Next, the right side (see FIGS. 1 and 2) of the cylinder 29 of the resin supply unit and the cylinder 45 of the molded product discharge unit will be described.
Reference numeral 49 denotes a frame-shaped holding portion, which is directly fixed on the base plate 3. The modeling portion driving motor 51 is attached to the holding portion 49, and the axial direction of the rotation shaft 53 is the left-right direction.

  Reference numeral 55 denotes a block-shaped modeling portion, and this modeling portion 55 has a cylindrical appearance, and a plurality of ridges 57 extend in parallel to the axial direction on the outer peripheral surface. As shown in FIGS. 5 and 6, the modeling portion 55 is formed with a plurality of cavities 59 a, 59 b,. Each hollow portion 59 has a substantially right cylindrical shape, and is arranged on the outer peripheral side of the modeling portion 55 so that its axial direction is parallel to the axial direction of the modeling portion 55. The hollow portions 59a, 59b,..., 59p are evenly arranged radially, and the outer peripheral surface of the modeling portion 55 swells along the outer edge to form a ridge 57. The inner peripheral surface of each cavity 59 is uneven, and a number of ridges 60 extend in parallel to the axial direction.

A connecting shaft 61 is inserted and fixed at the axial center of the modeling portion 55.
As shown in FIG. 7, the connecting shaft 61 is connected to the rotation shaft 53 of the modeling part driving motor 51 described above via a joint 63, and the modeling part 55 is pivoted by driving the modeling part driving motor 51. It is designed to rotate around.

Reference numerals 65 and 71 denote flat blocking portions, respectively. The blocking portions 65 and 71 are erected and fixed on the base plate 3 in a state where they face each other in parallel with the above-described modeling portion 55 sandwiched from both ends in the axial direction. The blocking portions 65 and 71 are spanned by a connecting rod 66. There is a slight gap between the closed portions 65 and 71 facing the both end faces of the modeling portion 55, and the modeling portion 55 is rotatable relative to the blocking portions 65 and 71.
As shown in FIG. 1, a supply hole 67 and an insertion hole 69 are formed in the closing portion 65. The supply hole 67 and the insertion hole 69 face each other in the horizontal direction. As shown in FIG. 5, the die head 31 of the screw 21 is fitted in the supply hole 67. On the other hand, as shown in FIG. 2, a discharge hole 73 is formed in the closing portion 71, and this discharge hole 73 faces the insertion hole 69 on the closing portion 65 side in the left-right direction.

As shown in FIG. 7, the connecting shaft 61 is rotatably supported by bearings 75 and 77 provided in the closing portions 65 and 71, respectively.
When the modeling portion 55 rotates, as shown in FIG. 6, the hollow portions 59 a, 59 b,... 59 p also move, but the supply hole 67, the insertion hole 69, and the closing portion 71 on the closing portion 65 side. The side discharge hole 73 is on the movement locus of the hollow portions 59a, 59b,. When the supply hole 67 on the closing part 65 side and the one cavity part 59 coincide with each other due to the rotation of the modeling part 55, the supply hole 33 of the die head 31 fitted in the supply hole 67 on the closing part 65 side. And communicates with the inside of the cylinder 29 on the resin supply means side, and is closed by the plate surface on the closing portion 71 side. At that time, both end openings of the other cavity 59 facing the cavity 59 and the connecting shaft 61 are aligned with the insertion hole 69 on the closing part 65 side and the discharge hole 73 on the closing part 71 side, respectively. The plunger 47 of the electric actuator 43 extends from the hole 69 side into the hollow portion 59 so that the plunger 47 can advance, and the discharge hole 73 side is opened outward.

Reference numeral 79 denotes a cooling fan. The cooling fan 79 is installed at three locations between the closed portion 65 and the closed portion 71, and sends air to the modeling portion 55 sandwiched between them to fill the hollow portion 59. The formed resin is cooled to promote solidification.
Reference numeral 81 denotes a discharge chute, and the discharge chute 81 is provided below the discharge hole 73 of the closing portion 71 so as to receive a fallen product from the discharge hole 73. Below the lower end side of the discharge chute 81, a collection container (not shown) for collecting the discharged shaped article is arranged.

This resin modeling apparatus 1 manufactures the stick-shaped model M shown in FIG. The shaped product M has a substantially cylindrical shape, and a large number of concave grooves m are formed on the outer peripheral surface thereof in parallel to the axial direction. The concave groove m is a transfer of the ridge 60 of the cavity 59.
The manufacturing process of the shaped product M will be described with reference to FIG.
The pellet-shaped resin charged in the hopper 37 is sequentially put into the cylinder 29 of the screw 21 of the resin supply means, sent while being melted, and is sufficiently melted from the die head 31 through the supply hole 67. It is supplied into the cavity 59a. As shown in FIG. 9 (1), the cavity 59a communicates with the inside of the cylinder 29 and is closed on the closing part 71 side, so that the molten resin L flows into the cavity 59a and is filled.

  At this time, the molten resin L is already solidified in the hollow portion 59i in the state of the molded product M, but is pushed by the advancement of the plunger 47 of the electric actuator 43 through the insertion hole 69 and is discharged. It is discharged through. The plunger 47 advances to some extent, and as shown in FIG. 9 (2), when the shaped product M is discharged, the plunger 47 moves backward and comes out of the cavity 59i and returns to the standby posture.

The torque of the screw 21 is constantly detected, and when the melted resin is sufficiently filled in the cavity 59a and the torque exceeds the set upper limit, as shown in FIG. 9 (3), in the direction of the arrow, The modeling unit driving motor 51 is driven to move the modeling unit 55 by 1 pitch. At this time, since the plunger 47 of the electric actuator 43 is returned to the standby posture, it does not get in the way.
Since the cavity 59a is still in a very melted state immediately after being filled with the resin, it is sheared cleanly by relative movement with the plate surface of the closing portion 65.
After moving 1 pitch, the cavity 59p comes to the position of the original cavity 59a, and the cavity 59h comes to the position of the original cavity 59i, and matches the supply hole 67, the insertion hole 69, and the discharge hole 73, respectively. Therefore, again, in the same manner as described above, filling of the molten resin L and discharging of the shaped article M that has already solidified and completed are performed.

In this manner, the melted resin is sequentially filled in the cavity 59, and solidified there to be discharged.
In the resin modeling apparatus 1, since the cavity 59 of the modeling part 55 is preheated by receiving heat from the cylindrical heater 39, the molten resin L flows smoothly and without gaps. On the other hand, three cooling fans 79 are arranged and solidified on the movement locus between 8 pitches where the cavity filled with the molten resin L comes to a position where the resin is discharged after solidification. Can be discharged when solidification is completed.
Therefore, the shaped product M can be manufactured efficiently and continuously. Moreover, since the heat source is provided at one location of the heater, the heat control is easy.

Next, a resin injection molding apparatus 101 using the above-described shaped article M as a molding material will be described with reference to the drawings.
In FIG. 10, the code | symbol 103 shows a metal mold | die. As shown in FIG. 11, a cavity defined by the lower mold 105 and the upper mold 107 of the mold 103 is a cavity 109 for molding a molded product, and the upper mold 107 has a gate communicating with the cavity 109. 111 is formed. A vertical injection cylinder 115 is erected on the mold 103 via a mounting plate 113. A die head 117 is provided on the lower end side of the injection cylinder 115, and the inside of the injection cylinder 115 communicates with the inside of the mold 103 through a supply hole 119 of the die head 117.

  A cylindrical heater 121 is fitted on the lower portion of the injection cylinder 115, and a continuous temperature gradient is given to the injection cylinder 115 by turning on the heater 121 so that the temperature increases toward the mold 103 side. It has become. Reference numeral 123 denotes a pushing shaft, which is lowered when the head portion of the pushing lever 125 is grasped and tilted counterclockwise as indicated by an arrow.

Next, the manufacturing procedure of a molded product will be described with reference to FIGS.
As shown in FIG. 11, two shaped products M have already been supplied to the injection cylinder 115, and the middle shaped product M is melted at the lower side and becomes completely melted, but the upper end is still almost the same. It is in a completely solidified state. The lower shaped product M is completely melted as the whole has been melted. The melted resin is rising through the gap between the inner peripheral surface of the injection cylinder 115 and the shaped product M up to the middle part of the middle shaped product M, and the upper end side of the melted resin is cooled again. Solidified (L → M). Accordingly, a cover that prevents the molten resin from further rising is formed in the middle part of the intermediate shaped product M. The molten resin is easily raised by the concave groove m of the shaped product M.
Therefore, when the operator inserts the shaped product M by hand from the upper side and further performs injection molding using the middle shaped product M, the upper shaped product M, and the push-in shaft 123 as a plunger, the lower completely melted resin. Since the portion flows into the cavity 109 of the mold 103 with sufficient pressure, a molded product with high dimensional accuracy can be manufactured.

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.
For example, in the above-described embodiment, the shaped article M is a molding material for an injection molding apparatus, but may be a final product depending on the application.

  The present invention is applicable to a manufacturing industry that manufactures resin molded products.

DESCRIPTION OF SYMBOLS 1 ... Resin shaping | molding apparatus 3 ... Base plate 5 ... Leg part 7 ... Fixing base 9 ... Holding part 11 ... Connecting shaft 13 ... Spring 15 ... Screw drive motor 17 ... Rotary shaft 19 ... Universal joint 21 ... Screw 25 ... Flight part 27 ... Bearing 29 ... Cylinder 31 ... Die head 33 ... Supply hole 35 ... Holding part 37 ... Hopper 39 ... Heater 41 ... Holding part 43 ... Electric actuator 45 ... Cylinder 47 ... Plunger 49 ... Holding part 51 ... Modeling part drive motor 53 ... Rotating shaft 55 ... Modeling part 57 ... Projection 59 ... Cavity 60 ... Projection 61 ... Connection shaft 63 ... Joint 65 ... Blocking part 66 ... Connection rod 67 ... Supply hole 69 ... Insertion hole 71 ... Blocking part 73 ... Discharge hole 75, 77 ... Bearing 79 ... Cooling fan 81 ... Discharge chute 101 ... Resin injection molding machine 103 ... Mold 105 ... Bottom 107 ... upper die 109 ... cavity 111 ... gate 113 ... mounting platen 115 ... injection tube 117 ... die head 119 ... supply holes 121 ... Heater 123 ... pushing shaft 125 ... push lever

Claims (7)

A modeling part that includes a plurality of cavities that extend in the axial direction and open at both ends in the axial direction, a rotating means that rotates the modeling part around its axis, and is fixed to face both axial ends of the modeling part , A flat plate-shaped blocking portion for blocking each of the hollow portions, a supply hole formed in one of the closed portions, communicating with one of the hollow portions of the modeling portion, and formed in one or the other of the blocking portions, The modeling unit includes: a discharge hole communicating with another one of the hollow portions of the modeling unit; a resin supply unit that supplies molten resin from the supply hole; and a modeled product discharge unit that discharges a modeled product from the discharge hole. When the supply hole communicates with one of the hollow portions by the rotation of the resin, molten resin is supplied from the resin supply means to the hollow portion through the supply holes, and immediately after the molten resin is supplied and filled. The cavity is formed with the supply hole. Was by moving relative to the plate surface of the closed portion, the molten resin is sheared, solidified shaped article is the discharge from the the discharge hole and the resin has been supplied cavity communicates its hollow portion A resin molding apparatus characterized by being discharged through a hole. In the resin modeling apparatus according to claim 1,
The shaped article discharge means is composed of an insertion hole formed in the closed portion so as to face the discharge hole in the axial direction, and a plunger that moves from the insertion hole into the hollow portion of the modeling part and moves freely. The resin molding apparatus, wherein the molded article is discharged through the discharge hole by the advance of the plunger. In the resin modeling apparatus according to claim 1 or 2,
The resin supply means is composed of a heating cylinder provided with a screw, and the pellet-shaped resin charged in the heating cylinder is transferred while being melted by the rotation of the screw and is transferred to the cavity of the modeling part. A resin molding apparatus characterized by being supplied. In the resin modeling apparatus according to any one of claims 1 to 3,
A resin molding apparatus, wherein the supply hole and the discharge hole face each other in the horizontal direction. In the resin modeling apparatus according to any one of claims 1 to 4,
A resin modeling apparatus, wherein the modeling unit is provided with a cooling means. In the resin modeling apparatus according to any one of claims 1 to 5,
The resin molding apparatus characterized in that the hollow portion of the modeling portion has a substantially columnar shape, and a plurality of ridges extending in parallel to the axial direction are formed on the inner peripheral surface thereof.   A molded article manufacturing facility comprising the resin shaping apparatus according to any one of claims 1 to 6 and an injection molding apparatus, wherein the injection molding apparatus includes a vertical injection cylinder having a lower end serving as a nozzle. A heating means for generating a temperature gradient in which the temperature rises downward from above in the inside of the injection cylinder, and a pressing means having a pressing shaft for pressing the molding material downward in the injection cylinder, A molded product manufacturing facility characterized in that a molded product manufactured by a modeling apparatus is supplied as a molding material to the injection cylinder to manufacture a molded product.

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