JP2016078384A - Injection molding device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an injection molding device that comprises a first injection machine and a second injection machine and can suppress bending of a tie bar to a permissible value.SOLUTION: A second injection machine 40 comprises a second slider 44 that moves on a second rail 43 on a table 14, a second heating cylinder 45 and a screw drive mechanism 47 that are supported by the second slider 44, and a second moving mechanism 60 that bridges between the second slider 44 and the tie bar 21 and reciprocates the second slider 44.EFFECT: The second injection machine is supported by a foundation through the table or a support member. Force necessary for moving the second injection machine is added to the tie bar, and the force is much smaller than the self-weight of the second injection machine. Consequently, an injection molding device with the second injection machine is provided that can suppress bending of the tie bar to a permissible value.SELECTED DRAWING: Figure 3

Description

  The present invention relates to an injection molding apparatus including two injection machines.

In many cases, resin molded products are composed of a single resin material, but in recent years, those composed of a plurality of types of resin materials have come into practical use.
A plurality of types of resin materials are respectively injected by a plurality of different injection machines (see, for example, Patent Document 1 (FIG. 1)).

  As shown in FIG. 1 of Patent Document 1, a screw cylinder (42) (the numbers in parentheses indicate the symbols described in Patent Document 1. The same applies hereinafter) and a screw cylinder (11) are provided. The latter screw cylinder (11) is supported by a fixed mold (50). That is, since the screw cylinder (11) is integrally attached to the fixed mold (50), the fixed mold (50) has a special structure.

  Moreover, since the dead weight of the screw cylinder (11) generates couples in the fixed mold (50), it is difficult to attach such a fixed mold (50) to the fixed platen (40).

  Considering the attaching / detaching operation of the fixed mold (50) to / from the fixed platen (40), a structure in which the screw cylinder (11) is not fixed to the fixed mold (50) is desired. Various structures that meet this demand have been proposed (see, for example, Patent Document 2 (FIGS. 1 and 3)).

  As shown in FIG. 3 of Patent Document 2, the vertical injection unit (2) is placed above the molds (17, 18) (the numbers in parentheses indicate the symbols described in Patent Document 2. The same applies hereinafter). Is arranged. This vertical injection unit (2) includes a unit base (21), a lower holding plate (22), a middle holding plate (23), and an upper holding plate (24) mounted on a tie bar (14). I have.

The structure of Patent Document 2 has the following problems.
First, since the vertical injection unit (2) is heavy, the tie bar (14) bends and hinders the movement of the movable platen (12).
If the outer diameter of the tie bar (14) is increased in order to suppress the deflection to an allowable value, the mold clamping device becomes large.

Further, since the vertical injection unit (2) is above the molds (17, 18), the resin molded product (product) cannot be taken out.
Furthermore, since the vertical injection unit (2) extends upward, the ceiling of the building cannot be lowered.

  An injection molding apparatus that can eliminate these problems is desired.

JP 2007-75999 A JP 2005-262849 A

  This invention makes it a subject to provide the injection molding apparatus which can suppress the bending | deflection of a tie bar to an allowable value in what is provided with a 1st injection machine and a 2nd injection machine.

In the invention according to claim 1, a tie bar is passed between the fixed platen and the pressure receiving plate, a movable platen is movably provided on the tiebar, and a mold clamping mechanism for clamping a mold with the fixed platen and the movable platen, A first injection machine having an injection axis parallel to the longitudinal axis of the tie bar and injecting the first resin material into the mold; and an injection axis arranged perpendicular to the longitudinal axis of the tie bar and the second resin material to the mold. An injection molding apparatus comprising: a second injection machine that injects the second injection machine; and a moving mechanism that moves the second injection machine so that the nozzle of the second injection machine touches the mold.
The second injection machine is supported by a base via a base or a support member, and the moving mechanism is spanned between the second injection machine and the tie bar.

  The invention according to claim 2 is characterized in that the injection shaft of the first injection machine and the injection shaft of the second injection machine are both arranged horizontally.

  In the invention which concerns on Claim 3, a tie bar consists of at least 3 1st-3rd tie bar arrange | positioned so that a shaping | molding die may be enclosed, and a 1st tie bar and a 2nd tie bar are rather than the injection shaft of a 1st injection machine. Arranged near the second injection machine, the moving mechanism is connected to the first tie bar at two locations and is connected to the second tie bar at two locations.

  In the invention which concerns on Claim 4, a tie bar consists of at least 3 1st-3rd tie bar arrange | positioned so that a shaping | molding die may be enclosed, and a 1st tie bar and a 2nd tie bar are rather than the injection shaft of a 1st injection machine. It is arranged near the second injection machine, and the moving mechanism is connected to the first tie bar at two locations.

  The invention according to claim 5 is characterized in that the second injection machine and the tie bar are connected by a single rod.

  The invention according to claim 6 is characterized in that the second injection machine and the tie bar are connected by a plurality of rods arranged in parallel to each other.

  In the invention which concerns on Claim 1, the 2nd injection machine is supported by the foundation through the stand or the support member. The tie bar receives a force necessary to move the second injector, but this force is much smaller than the weight of the second injector. Accordingly, an injection molding apparatus that can suppress the tie bar deflection to an allowable value in the apparatus including the second injection machine is provided.

  In the invention which concerns on Claim 2, both the 1st injection machine and the 2nd injection machine are installed horizontally, and the upper part of a shaping | molding die can be open | released. The resin molded product can be taken out from the mold.

  In the invention which concerns on Claim 3, a moving mechanism is connected with a 1st tie bar at two places, and is connected with a 2nd tie bar at two places. There are a total of 4 connecting points. 1/4 of the force required to move the second injector is applied to each part of the tie bar. The force is distributed and tie bar deflection can be greatly reduced.

  In the invention which concerns on Claim 4, the moving mechanism is connected with the 1st tie bar at two places. 1/2 of the force required to move the second injector is applied to each part of the tie bar. The force is distributed and tie bar deflection can be reduced. Two sets of connecting tools are provided for connection, and the moving mechanism can be reduced in weight and simplified.

  In the invention which concerns on Claim 5, since the number of rods is 1, the procurement cost of a moving mechanism can be reduced.

  In the invention which concerns on Claim 6, since the number of rods is two or more, the 2nd injection machine can be moved linearly without meandering.

It is a rear view of the injection molding apparatus which concerns on this invention. It is a principal part top view of an injection molding apparatus. FIG. 3 is a view taken along arrow 3-3 in FIG. 2. It is a disassembled perspective view of a 2nd moving mechanism. FIG. 5 is an enlarged view of part 5 of FIG. 3. It is a disassembled perspective view which shows the example of a change of a 2nd moving mechanism. It is a disassembled perspective view which shows the further example of a change of a 2nd moving mechanism. It is a disassembled perspective view which shows the further example of a change of a 2nd moving mechanism.

  Embodiments of the present invention will be described below with reference to the accompanying drawings. The drawings are viewed in the direction of the reference numerals.

FIG. 1 is a view of a back surface opposite to the front surface, not the front surface on which the operation panel is provided.
As shown in FIG. 1, an injection molding apparatus 10 includes a base 12 fixed to a base 11 (or a machine base), a mold clamping mechanism 20 mounted on the base 12, and one of the mold clamping mechanisms 20. The first injection machine 30 that is placed on the base 12 and injects the first resin material so that the longitudinal axis 22 of the tie bar 21 that is a component and the injection axis 31 are parallel to each other, and the base 14 ( Or a support member) and a second injection machine 40 that is placed on the table 14 and injects the second resin material.

In this embodiment, the base 14 is separate from the base 12, but may be integrated with the base 12.
The mold clamping mechanism 20 includes a fixed platen 23 fixed to the base 12, a pressure receiving plate 24 fixed to the base 12 at a predetermined distance from the fixed platen 23, and the fixed platen 23 and the pressure receiving plate 24. The tie bar 21 to be handed over, the movable platen 25 guided to be movable by the tiebar 21, the toggle link 26 for moving the movable platen 25, and the toggle drive provided in the pressure receiving platen 24 for driving the toggle link 26 The mold 27 (mold) is clamped by the fixed platen 23 and the movable platen 25, which includes a source 27 and a toggle screw 28.

  The toggle link 26, the toggle drive source 27, and the toggle screw 28 can be changed to a clamping cylinder (hydraulic cylinder).

  The first injection machine 30 includes a first rail 32 laid on the upper surface of the base 12, a first slider 33 moving on the first rail 32, and a first heating cylinder supported by the first slider 33. 34, a first hopper 35 that is provided in the first heating cylinder 34 and supplies the first resin material into the first heating cylinder 34, and a screw 36 that is rotatably and movably accommodated in the first heating cylinder 34. The screw drive mechanism 37 that rotates and moves the screw 36, and the first slider 33 and the first moving mechanism 38 that is transferred to the fixed platen 23 and moves the first slider 33 back and forth.

As shown in FIG. 2, the second injection machine 40 is arranged such that its injection shaft 42 is orthogonal to the longitudinal axis 22 of the tie bar 21.
The molding die 50 includes a fixed die 51 that is bolted to the fixed platen 23 and a movable die 52 that is bolted to the movable platen 25.

  As shown in FIG. 3, the second injection machine 40 is supported by the second rail 43 laid on the upper surface of the base 14, the second slider 44 moving on the second rail 43, and the second slider 44. The second heating cylinder 45, the second hopper 46 provided in the second heating cylinder 45 for supplying the second resin material into the second heating cylinder 45, and supported by the second slider 44 to rotate and move the screw. And a second moving mechanism 60 which is transferred to the second slider 44 and the tie bar 21 and reciprocates the second slider 44.

  The number of tie bars 21 is generally four, but in the case of a vertical rotary injection molding apparatus, it is three. Of the two on the second injection machine 40 side, the lower tie bar 21 is called a first tie bar 21A, and the upper tie bar 21 is called a second tie bar 21B for use in the following description. The remaining one or two tie bars 21 are shown in FIG. 2 and are called third tie bars 21C.

Since the present invention is characterized by the second moving mechanism 60, the second moving mechanism 60 will be described in detail below.
As shown in FIG. 4, the second moving mechanism 60 includes one rod 61, a square member 62 attached to the tip of the rod 61, and a pair of L that can fit the square member 62 from above. Character guides 63, 63, a third slider 64 to which these L-shaped guides 63, 63 are attached, a third rail 65 that supports the third slider 64, and one end of the third rail 65 are fixed and the first A first bridge member 66 passed between the second tie bars 21A, 21B, a first connector 68 having a semi-cylindrical recess 67 fixed to one end of the first bridge member 66 and housing the first tie bar 21A; The second connecting member 72 having a semi-cylindrical recess 71 fixed to the other end of the one bridge member 66 and housing the second tie bar 21B, and the first and second tie bars 21A, 21B having the other end of the third rail 65 fixed. In A second bridge member 73, a third connector 75 having a semi-cylindrical recess 74 fixed to one end of the second bridge member 73 and containing the first tie bar 21A, and the other end of the second bridge member 73. And a fourth connector 77 having a semi-cylindrical recess 76 that is fixed and accommodates the second tie bar 21B.

  A cap 79 having a semi-cylindrical recess 78 for housing the first and second tie bars 21A, 21B is applied to the first to fourth connectors 68, 72, 75, 77, and fastened with a bolt 81, so that the first -The 4th connection tool 68, 72, 75, 77 can be connected with the 1st tie bar 21A or the 2nd tie bar 21B.

  The axial force applied to the rod 61 is divided into approximately four equal parts by the first to fourth couplers 68, 72, 75, 77. An intermediate load between the concentrated load and the distributed load is applied to the first tie bar 21A and the second tie bar 21B. As a result, the bending of the first tie bar 21A and the second tie bar 21B can be reduced.

  Preferably, the metal 82 is fitted to the second to fourth connectors 72, 75, 77 and the cap 79 excluding the first connector 68. As a result, the first connector 68 is fixed to the first tie bar 21A, and the second to fourth connectors 72, 75, 77 are movable in the axial direction of the first tie bar 21A or the second tie bar 21B.

  As shown in FIG. 5, the third rail 65 is fixed to the first bridge member 66, the third slider 64 is fitted to the third rail 65, and the L-shaped guide 63 is attached to the third slider 64. A square member 62 is fitted to the L-shaped guide 63.

The square member 62 is connected to the third slider 64 so as to be relatively movable up and down. The third slider 64 is fitted to the third rail 65 so as to be relatively horizontally movable.
As a result, the rod 61 can be relatively moved in the vertical direction, the horizontal direction, and the direction in which these are combined.
In FIG. 2, the mold 50 expands or contracts under the influence of the temperature of the resin material. Then, the tie bar 21 extends or contracts. Then, the position of the third rail 65 changes.
In this case, in FIG. 5, the displacement of the third rail 65 and the rod 61 is absorbed by the movement of the third slider 64.

In FIG. 3, the height of the third slider 64 changes due to temperature changes. Since the square member 62 moves up and down, the temperature change is absorbed.
In FIG. 4, the presence of the metal 82 moves the second to fourth couplers 72, 75, 77 in the axial direction, so that the expansion or contraction of the tie bars 21 </ b> A, 21 </ b> B is not hindered.

If the second injection machine 40 is placed on the tie bar 21 as in the prior art, the tie bar 21 bends due to the weight of the second injection machine 40. In this regard, in the present invention, as shown in FIG. 3, the base 14 is set up on the base 11, and the second injector 40 is supported by the base 14. The weight of the second injection machine 40 is not applied to the tie bar 21. The friction coefficient between the second rail 43 and the second slider 44 is about 0.03 in the case of a linear guide incorporating a steel ball. Then, a value obtained by multiplying the mass of the second injection machine 40 by 0.03 is added to the first tie bar 21 </ b> A via the rod 61. However, since this force is 3% of the mass of the 2nd injection machine 40, it is slight. Even if the nozzle touch force is added to this force, the force is much smaller than before.
As a result, according to the present invention, the bending of the tie bar 21 can be significantly suppressed.

  In addition, if the second injection machine 40 is placed on the mold, it affects the removal of the molded product. In this regard, in the present invention, the second injection machine 40 is not disposed on the mold 50 as shown in FIG. As a result, the molded product can be easily taken out.

Moreover, as shown in FIG. 1, if it is the horizontal type injection molding apparatus 10, the ceiling of a building can be made low.
Furthermore, as shown in FIG. 4, the first and second bridge members 66 and 73 can be removed from the tie bar 21 by removing the bolt 81. The injection molding apparatus 10 shown in FIG. 1 is completed only by adding the base 14, the second injection machine 40, and the second moving mechanism 60 shown in FIG. 3 to the existing injection molding apparatus.

Incidentally, as shown in FIG. 2, when the number of rods 61 is one, the structure is simple, but the second slider 44 may be meandering.
FIG. 6 shows an improvement on this point.
The second moving mechanism 60 in FIG. 6 differs from that in FIG. 4 in that the number of rods 61 is two and the square members 62 and 62 and the third sliders 64 and 64 are two sets. The other parts are the same as those in FIG. 4, and thus the reference numerals in FIG. 4 are used and detailed description thereof is omitted.
In the second moving mechanism 60 of FIG. 6, since the second slider 44 is moved by the two left and right rods 61, 61, there is no fear of the second slider 44 meandering.

A further modification of the second moving mechanism 60 will be described with reference to FIGS.
The second moving mechanism 60 in FIG. 7 is the same as the first and second bridge members (FIG. 4, reference numerals 66 and 73) and the second and fourth connecting members (FIG. 4, reference numerals 72 and 77). Different from 4. The other parts are the same as those in FIG. 4, and thus the reference numerals in FIG. 4 are used and detailed description thereof is omitted.
FIG. 7 has a much simpler structure than that of FIG. 4 and can reduce costs.

  The axial force applied to the rod 61 is divided into two equal parts by the first and third couplers 68 and 75. An intermediate load between the concentrated load and the distributed load is applied to the first tie bar 21A. Compared with the case where a concentrated load is applied to the first tie bar 21A at one location, the bending of the first tie bar 21A can be reduced.

The second moving mechanism 60 of FIG. 8 omits the first and second bridge members (FIG. 4, reference numerals 66 and 73) and the second, third and fourth coupling members (FIG. 4, reference numerals 72, 75 and 77). This is different from FIG. The other parts are the same as those in FIG. 4, and thus the reference numerals in FIG. 4 are used and detailed description thereof is omitted.
FIG. 8 has a simpler structure than that of FIG. 7 and can reduce costs.

  The present invention can be applied to a vertical injection molding apparatus in addition to a horizontal injection molding apparatus.

  The present invention is suitable for an injection molding apparatus including a first injection machine and a second injection machine.

  DESCRIPTION OF SYMBOLS 10 ... Injection molding apparatus, 11 ... Base, 14 ... Stand, 20 ... Clamping mechanism, 21 ... Tie bar, 21A ... First tie bar, 21B ... Second tie bar, 21C ... Third tie bar, 22 ... Long axis of tie bar, 23 DESCRIPTION OF SYMBOLS ... Fixed platen, 24 ... Pressure receiving plate, 25 ... Movable platen, 30 ... 1st injection machine, 31 ... Injection axis of 1st injection machine, 40 ... 2nd injection machine, 42 ... Injection axis of 2nd injection machine, 50 ... Mold, 60 ... moving mechanism (second moving mechanism), 61 ... rod.

Claims (6)

A tie bar is passed between the fixed platen and the pressure platen, and a movable platen is movably provided on the tiebar. A first injection machine for injecting the first resin material into the mold, and a second injection machine for injecting the second resin material into the mold with an injection axis arranged perpendicular to the longitudinal axis of the tie bar; An injection molding apparatus comprising: a moving mechanism for moving the second injection machine so that the nozzle of the second injection machine touches the mold.
The second injection machine is supported on a foundation via a base or a support member,
The injection molding apparatus, wherein the moving mechanism is stretched over the second injection machine and the tie bar.   2. The injection molding apparatus according to claim 1, wherein an injection shaft of the first injection machine and an injection shaft of the second injection machine are both disposed horizontally. The tie bar is composed of at least three first to third tie bars arranged so as to surround the mold, and the first tie bar and the second tie bar are more second than the injection shaft of the first injection machine. Placed near the injection machine,
3. The injection molding apparatus according to claim 1, wherein the moving mechanism is connected to the first tie bar at two locations and is connected to the second tie bar at two locations. 4. The tie bar is composed of at least three first to third tie bars arranged so as to surround the mold, and the first tie bar and the second tie bar are more second than the injection shaft of the first injection machine. Placed near the injection machine,
The injection molding apparatus according to claim 1 or 2, wherein the moving mechanism is connected to the first tie bar at two locations.   The injection molding apparatus according to any one of claims 1 to 4, wherein the second injection machine and the tie bar are connected by a single rod.   The injection molding apparatus according to any one of claims 1 to 4, wherein the second injection machine and the tie bar are connected by a plurality of rods arranged in parallel to each other.

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