CN111251531A - Injection molding machine - Google Patents

Abstract

The present invention relates to an injection molding machine. The invention provides a technology capable of simultaneously shortening a molding cycle and changing an object pushed out from a mold main body. The injection molding machine of the present invention comprises: a table on which a mold main body is mounted; a platen on which the table is rotatably and/or slidably mounted; a table pin disposed inside the table; and an ejector that moves a movable portion, which is disposed inside the mold main body and ejects the molded product, forward and backward by the table pin, wherein the mold main body forms a 1 st molding portion for molding a 1 st molded product and a 2 nd molding portion for molding a 2 nd molded product including the 1 st molded product as a part, and an ejection position of the movable portion in the 1 st molding portion is different from an ejection position of the movable portion in the 2 nd molding portion.

Description

Injection molding machine

Technical Field

The present application claims priority based on japanese patent application No. 2018-225806, applied on 11/30/2018. The entire contents of this Japanese application are incorporated by reference into this specification.

The present invention relates to an injection molding machine.

Background

The injection molding machine described in patent document 1 is a two-material molding machine, and includes: pressing a plate; a turnover table which is freely installed on the pressure plate in a turnover manner; a push-out pin freely arranged in the turnover worktable in an advancing and retreating way; and an ejector rod for advancing and retreating the ejector pin. A die main body is attached to the turning table, and an ejector pin is disposed in the die main body so as to be freely movable forward and backward. When the turnover worktable is turned over, the ejector rod is in standby at the rear part of the turnover worktable so as not to interfere with the turnover worktable. After the turnover worktable is turned over, the ejector rod advances to enter the inside of the turnover worktable, so that the ejector pin advances. The ejector pins advance together with the ejector pins, and the 2-stage molded article is ejected from the mold body. After the inversion table is inverted, when the ejector rod is advanced, the idle running distance of the ejector rod can be shortened by the length of the ejector pin, and the molding cycle can be shortened.

Patent document 1: japanese patent laid-open publication No. 2005-14430

The ejector pin of patent document 1 is arranged in the inversion table so as to be movable forward and backward, thereby shortening the molding cycle. The ejector pin and the turnover worktable turn over together. The ejector pin is also turned together with the turn table, as is the ejector pin.

The positional relationship of the ejector pins and the ejector pins does not change before and after the turnover table is turned over. Therefore, when the same ejector pin is advanced by the ejector rod before and after the inversion of the inversion table, the same ejector pin is advanced.

Before and after the inversion of the inversion table, the same ejector pins are pushed forward from the same portions of the mold main body. Therefore, the object pushed out from the mold main body cannot be changed before and after the inversion of the inversion table.

Disclosure of Invention

An aspect of the present invention provides a technique capable of simultaneously shortening a molding cycle and changing an object to be pushed out from a mold main body.

An injection molding machine according to an aspect of the present invention includes:

a table on which a mold main body is mounted;

a platen on which the table is rotatably and/or slidably mounted;

a table pin disposed inside the table; and

an ejector device for advancing and retreating a movable portion which is disposed inside the die main body and ejects a molded product by the table pin,

the mold main body portion forms a 1 st molding portion for molding a 1 st molded article and a 2 nd molding portion for molding a 2 nd molded article including the 1 st molded article as a part,

the push-out position of the movable portion in the 1 st molding portion is different from the push-out position of the movable portion in the 2 nd molding portion.

ADVANTAGEOUS EFFECTS OF INVENTION

According to one aspect of the present invention, it is possible to simultaneously shorten the molding cycle and change the object to be pushed out from the mold main body.

Drawings

Fig. 1 is a diagram showing a state of an injection molding machine according to an embodiment when mold opening is completed.

Fig. 2 is a diagram showing a state of mold clamping of the injection molding machine according to the embodiment.

Fig. 3 is a cross-sectional view showing a state of the mold apparatus when the rotation angle of the table according to the embodiment is 0 ° and the mold is clamped.

Fig. 4 is a cross-sectional view showing a state of the mold apparatus when the rotation angle of the table according to the embodiment is 0 ° and the mold opening is completed.

Fig. 5 is a diagram showing a state of the mold apparatus when the rotation angle of the table is 180 ° and the mold is closed according to the embodiment.

Fig. 6 is a cross-sectional view showing a state of the mold apparatus when the rotation angle of the table is 180 ° and the mold opening is completed according to the embodiment.

Fig. 7 is an enlarged view of a part of fig. 6.

Fig. 8 is a diagram showing a state of the mold apparatus when the rotation angle of the table according to modification 1 is 180 ° and the mold is closed.

Fig. 9 is a cross-sectional view showing a state of the mold apparatus when the rotation angle of the table according to modification 1 is 180 ° and the mold opening is completed.

Fig. 10 is an enlarged view of a part of fig. 9.

Fig. 11 is a diagram showing a state of the mold apparatus when the rotation angle of the table according to modification 2 is 180 ° and the mold is closed.

Fig. 12 is a cross-sectional view showing a state of the mold apparatus when the rotation angle of the table according to modification 2 is 180 ° and the mold opening is completed.

Fig. 13 is an enlarged view of a part of fig. 12.

Description of the symbols

10-injection molding machine, 21-1 st molded article, 22-1 st cavity space molded article, 23-1 st communicating space molded article, 25-2 nd molded article, 26-2 nd cavity space molded article, 27-2 nd communicating space molded article, 100-mold clamping device, 120-movable platen (platen), 520-stage, 520X-rotation center line, 540-1 st stage pin, 550-2 nd stage pin, 560-stage pin, 800-mold device, 801-1 st molding section, 802-1 st cavity space, 803-1 st communicating space, 805-2 nd molding section, 806-2 nd cavity space, 807-2 nd communicating space, 820-movable mold (mold), 830-mold main body section, 840-1 st movable section, 850-2 nd movable part, 860-movable part.

Detailed Description

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings, the same or corresponding components are denoted by the same or corresponding reference numerals, and description thereof may be omitted.

(injection molding machine)

Fig. 1 is a diagram showing a state of an injection molding machine according to an embodiment when mold opening is completed. Fig. 2 is a diagram showing a state of mold clamping of the injection molding machine according to the embodiment. Fig. 3 is a cross-sectional view showing a state of the mold apparatus when the rotation angle of the table according to the embodiment is 0 ° and the mold is clamped. Fig. 4 is a cross-sectional view showing a state of the mold apparatus when the rotation angle of the table according to the embodiment is 0 ° and the mold opening is completed. Fig. 5 is a diagram showing a state of the mold apparatus when the rotation angle of the table is 180 ° and the mold is closed according to the embodiment. Fig. 6 is a cross-sectional view showing a state of the mold apparatus when the mold opening is completed with the rotation angle of the table set to 180 ° according to the embodiment. Fig. 7 is an enlarged view of a part of fig. 6. Fig. 1 and 2 are cross-sectional views taken along line I-I of fig. 3.

In this specification, the X-axis direction, the Y-axis direction, and the Z-axis direction are directions perpendicular to each other. The X-axis direction and the Y-axis direction indicate the horizontal direction, and the Z-axis direction indicates the vertical direction. When the mold clamping device 100 is horizontal, the X-axis direction is the mold opening/closing direction, and the Y-axis direction is the width direction of the injection molding machine 10. The Y-direction negative side is referred to as an operation side, and the Y-direction positive side is referred to as an opposite operation side.

The injection molding machine 10 includes a mold clamping device 100, an ejector 200, a 1 st injection device 301, a 2 nd injection device 302, a 1 st transfer device 401, a 2 nd transfer device (not shown), a control device 700, and a frame 900. The frame 900 includes a clamp frame 910 and an injection device frame 920. The mold clamping frame 910 and the injection device frame 920 are respectively provided on the floor panel 2 via leveling regulators 930. The control device 700 is disposed in the inner space of the injection device frame 920. Hereinafter, each constituent element of the injection molding machine 10 will be described.

(mold clamping device)

In the description of the mold clamping apparatus 100, the moving direction of the movable platen 120 (for example, the positive X-axis direction) when the mold is closed is defined as the front side, and the moving direction of the movable platen 120 (for example, the negative X-axis direction) when the mold is opened is defined as the rear side.

The mold clamping device 100 closes, raises, clamps, reduces, and opens the mold of the mold device 800. The mold apparatus 800 includes a stationary mold 810 and a movable mold 820.

The mold clamping device 100 is, for example, horizontal, and the mold opening and closing direction is horizontal. The mold clamping device 100 includes a fixed platen 110, a movable platen 120, a table 520, a rotation mechanism 530, and a movement mechanism 102.

The fixed platen 110 is fixed to the mold clamping unit frame 910. A fixed mold 810 is attached to the surface of the fixed platen 110 facing the movable platen 120. As shown in fig. 3, the fixed mold 810 has a 1 st fixed molding surface 811 and a 2 nd fixed molding surface 812 on the opposite surface to the movable mold 820.

The 1 st fixing molding surface 811 forms the 1 st molding portion 801 for molding the 1 st molded article 21. More specifically, the 1 st fixing molding surface 811 forms a part of the wall surface of the 1 st molding portion 801. The 1 st molding part 801 has a 1 st cavity space 802 and a 1 st communication space 803 communicating with the 1 st cavity space 802. The 1 st communicating space 803 is a so-called flow channel in the present embodiment. In the case where the 1 st communicating space 803 is a runner, the molten molding material flows into the 1 st cavity space 802 through the 1 st communicating space 803. Then, in both the 1 st cavity space 802 and the 1 st communicating space 803, the molding material is cooled and solidified. The article molded in the 1 st cavity space 802 is referred to as a 1 st cavity space molded article 22. The article molded in the 1 st communicating space 803 will be referred to as a 1 st communicating space molded article 23. The 1 st molded article 21 includes a 1 st cavity space molded article 22 and a 1 st connected space molded article 23. In the present embodiment, the 1 st communicating space 803 is a runner, and therefore the 1 st communicating space molded article 23 is also referred to as the 1 st runner molded article 23. The 1 st runner molding 23 is an unnecessary article, and is discarded or reused as a recycled material.

The 2 nd fixing molding surface 812 forms the 2 nd molding part 805 which molds the 2 nd molded product 25. More specifically, the 2 nd fixed mold surface 812 forms a part of the wall surface of the 2 nd mold section 805. The 2 nd molding part 805 has a 2 nd cavity space 806 and a 2 nd communicating space 807 communicating with the 2 nd cavity space 806. The 2 nd communicating space 807 is a so-called flow passage in the present embodiment. In the case where the 2 nd communicating space 807 is a runner, the molten molding material flows into the 2 nd cavity space 806 through the 2 nd communicating space 807. Then, in both the 2 nd cavity space 806 and the 2 nd communicating space 807, the molding material is cooled and solidified. The article molded in the 2 nd cavity space 806 is referred to as a 2 nd cavity space molded article 26. The article molded in the 2 nd communicating space 807 is referred to as a 2 nd communicating space molded article 27. The 2 nd molded product 25 includes the 1 st cavity space molded product 22 and the 2 nd communicating space molded product 27. In the present embodiment, since the 2 nd communicating space 807 is a runner, the 2 nd communicating space molded article 27 is also referred to as a 2 nd runner molded article 27. The 2 nd runner molding 27 is an unnecessary article and is discarded or reused as a recycled material.

The 2 nd molded article 25 includes the 1 st molded article 21 as a part. That is, a part of the 2 nd molded product 25 is the 1 st molded product 21. For example, a part of the 2 nd cavity space molded article 26 is the 1 st cavity space molded article 22. The 1 st cavity space molded article 22 is a 1 st molded article, and the 2 nd cavity space molded article 26 is a 2 nd molded article. As will be described later, the 1 st cavity space molded article 22 may be a 2-stage molded article, and the 2 nd cavity space molded article 26 may be a 3-stage molded article. The 1 st cavity space molded article 22 may be an n (n is a natural number of 1 or more) preform, and the 2 nd cavity space molded article 26 may be an n +1 preform. The n + 1-time molded article includes n-time molded articles in a part thereof.

The 1 st fixed molding surface 811 and the 2 nd fixed molding surface 812 are formed in different shapes, and are formed in, for example, a concave shape. The fixed mold 810 has a plurality of plates (not shown) stacked in the mold opening and closing direction. Among the plurality of plates constituting the fixed mold 810, a plate in contact with the movable mold 820 is referred to as a mold plate. The 1 st fixed molding surface 811 and the 2 nd fixed molding surface 812 are formed on the same mold plate, but may be formed on different mold plates.

The movable platen 120 is disposed on the mold clamping unit frame 910 so as to be movable in the mold opening/closing direction. A guide 101 for guiding the movable platen 120 is laid on the mold clamping unit frame 910. A movable mold 820 is attached to the surface of the movable platen 120 facing the fixed platen 110 via the table 520.

The movable mold 820 has a 1 st movable molding surface 821 and a 2 nd movable molding surface 822 on the surfaces opposite to the fixed mold 810. As shown in fig. 3, the 1 st movable molding surface 821 forms the 1 st molding part 801, and the 2 nd movable molding surface 822 forms the 2 nd molding part 805. Also, as shown in fig. 5, the 1 st movable molding surface 821 forms the 2 nd molding part 805, and the 2 nd movable molding surface 822 forms the 1 st molding part 801. The 1 st movable molding surface 821 and the 2 nd movable molding surface 822 sequentially form a 1 st molding part 801 and a 2 nd molding part 805, respectively. More specifically, the 1 st movable molding surface 821 and the 2 nd movable molding surface 822 sequentially form a part of the wall surface of the 1 st molding part 801 and a part of the wall surface of the 2 nd molding part 805, respectively.

The 1 st movable molding surface 821 and the 2 nd movable molding surface 822 are formed in the same shape, and are formed in a convex shape, for example. The movable mold 820 has a plurality of plates stacked in the mold opening and closing direction. Among the plurality of plates constituting the movable mold 820, a plate in contact with the fixed mold 810 is referred to as a mold plate. The 1 st movable molding surface 821 and the 2 nd movable molding surface 822 are formed on the same mold plate, but may be formed on different mold plates.

In the present embodiment, the 1 st fixed molding surface 811 and the 2 nd fixed molding surface 812 are formed in a concave shape, and the 1 st movable molding surface 821 and the 2 nd movable molding surface 822 are formed in a convex shape, but the present invention is not limited thereto. That is, the 1 st fixed molding surface 811 and the 2 nd fixed molding surface 812 may be formed in a convex shape, and the 1 st movable molding surface 821 and the 2 nd movable molding surface 822 may be formed in a concave shape.

In addition, the movable mold 820 of the present embodiment has a plurality of (for example, 2) movable molding surfaces in which the 1 st molding part 801 and the 2 nd molding part 805 are formed in order, but the number of the movable molding surfaces may be 1. The reason why the number of movable forming surfaces is plural in the present embodiment is to form the 1 st molding part 801 and the 2 nd molding part 805 at the same time and to improve the productivity of the molded product.

The table 520 is rotatably attached to the movable platen 120. The rotation center line 520X of the table 520 is parallel to the mold opening and closing direction. The table 520 is formed not to interfere with the 4 connection bars 140 when rotated. Specifically, the table 520 is disposed inside the inscribed circle of the 4 tie bars 140 as viewed in the mold opening and closing direction.

The rotation mechanism 530 rotates the table 520. The rotating mechanism 530 includes a rotating motor 531 and a transmission mechanism 532 that transmits the rotational driving force of the rotating motor 531 to the table 520. The transmission mechanism 532 is constituted by, for example, a drive gear 533, an intermediate gear 534, a driven gear 535, and the like.

The rotary motor 531 is disposed on the side of the movable platen 120, but may be disposed below or above the movable platen 120. Also, the structure of the transmission mechanism 532 may be a general structure, for example, the transmission mechanism 532 may have a timing belt instead of a gear.

For every 180 ° of rotation of the table 520, the direction of rotation of the table 520 may be reversed. For example, the rotation mechanism 530 rotates the table 520 by 180 ° in the clockwise direction, and then rotates the table 520 by 180 ° in the counterclockwise direction. Since the arrangement of the wiring and the piping fixed to the table 520 is restored, the wiring and the piping can be easily arranged.

As shown in fig. 3, when the mold is closed, the 1 st movable molding surface 821 and the 1 st fixed molding surface 811 form the 1 st molding part 801, and the 2 nd movable molding surface 822 and the 2 nd fixed molding surface 812 form the 2 nd molding part 805. The molding material is supplied from the 1 st injection device 301 to the 1 st molding section 801 to mold the 1 st molded article 21. Then, the mold is opened.

Next, as shown in fig. 4, the ejector 200 pushes the 1 st runner molded product 23 out of the mold main body 830 of the movable mold 820. As will be described in detail later, when the ejector 200 ejects the 1 st runner molded article 23, the 1 st cavity space molded article 22 is not ejected together with the 1 st runner molded article 23. The 1 st cavity space molded product 22 rotates 180 ° together with the movable mold 820 in a state of being attached to the mold main body 830 of the movable mold 820. Then, mold clamping is performed as shown in fig. 5.

As shown in fig. 5, when the dies are closed, the 2 nd movable molding surface 822 and the 1 st fixed molding surface 811 form the 1 st molding part 801, and the 1 st movable molding surface 821 and the 2 nd fixed molding surface 812 form the 2 nd molding part 805. The 1 st cavity space molded product 22 is disposed in a part of the 2 nd molding section 805. The molding material is supplied from the 2 nd injection device 302 to the remaining portion of the 2 nd molding section 805 to mold the 2 nd cavity space molded product 26. The 2 nd cavity space molded article 26 includes the 1 st cavity space molded article 22 in a part thereof.

Since the 1 st runner molding 23 is removed, the space from which the 1 st runner molding 23 is removed can be used as a space for guiding the molding material from the 2 nd injection device 302 to the 2 nd molding section 805. Further, since the 1 st runner molded product 23 is removed, the space where the 1 st runner molded product 23 is removed can be filled with the molding material injected from the 2 nd injection device 302, and the color of the molding material can be changed.

As shown in fig. 5, when the mold is closed, the 1 st cavity space molded article 22 is molded in parallel with the molding of the 2 nd cavity space molded article 26. The 1 st cavity space molded article 22 is molded in the 1 st molding part 801. Then, the mold is opened.

Next, as shown in fig. 6, the ejector 200 pushes out the 2 nd cavity space molded product 26 from the mold main body 830 of the movable mold 820. As will be described in detail later, the ejector 200 pushes out the 2 nd runner molding 27 together with the 2 nd cavity space molding 26.

The 1 st runner molded product 23 is pushed out in parallel with the 2 nd cavity space molded product 26. At this time, the 1 st cavity space molded article 22 is not pushed out together with the 1 st runner molded article 23. Then, the mold is opened, and the table 520 is rotated again by 180 °. The 1 st cavity space molded product 22 is rotated 180 ° together with the movable mold 820. Then, the mold is closed, and the 1 st cavity space molded article 22 is disposed again in a part of the 2 nd molding section 805.

As shown in fig. 3 and 5, the movable platen 120 mainly includes a front panel 121, an intermediate block 124, a rear block 126, and a toggle link mounting portion 128 (see fig. 1 and 2). The front plate 121, the intermediate block 124, the rear block 126, and the toggle link mounting portion 128 may be formed separately and connected, or may be integrally formed by casting or the like.

The front panel 121 rotatably supports the table 520. A 1 st lever hole 122 penetrating the front panel 121 in the opening and closing direction is formed in the front panel 121. The 1 st ejector rod 210 is disposed in the 1 st rod hole 122 so as to be able to advance and retreat. Further, a 2 nd rod hole 123 penetrating the front panel 121 in the mold opening and closing direction is formed in the front panel 121. The 2 nd ejector rod 220 is disposed in the 2 nd rod hole 123 to be freely advanced and retracted.

The intermediate block 124 is disposed radially inward of the cylindrical portion 523 of the table 520. A space for disposing the 1 st driving mechanism 211 of the ejector 200 and a space for disposing the 2 nd driving mechanism 221 of the ejector 200 are formed inside the intermediate block 124.

The rear block 126 rotatably supports the driven gear 535. A space for disposing the 1 st driving mechanism 211 of the ejector 200 and a space for disposing the 2 nd driving mechanism 221 of the ejector 200 are formed inside the rear block 126.

A pair of toggle link mounting portions 128 (see fig. 1 and 2) are provided at a Y-axis direction center portion of the rear end surface of the rear block 126 at intervals in the Z-axis direction. The pair of toggle link mounting portions 128 each have a plurality of toggle link mounting plates perpendicular to the Y-axis direction at intervals in the Y-direction. The toggle link mounting plates each protrude rearward from a rear end surface of the rear block 126 and have pin holes at their front ends. A pin is inserted through the pin hole, and the 1 st link 152 (see fig. 1 and 2) is swingably attached to the toggle link attachment portion 128 via the pin.

The moving mechanism 102 moves the movable platen 120 forward and backward with respect to the fixed platen 110, thereby performing mold closing, pressure raising, mold clamping, pressure reducing, and mold opening of the mold apparatus 800. When the mold is opened, the rotating mechanism 530 rotates the table 520 by 180 °. The moving mechanism 102 includes a toggle base 130, a connecting rod 140, a toggle mechanism 150, a mold clamping motor 160, a motion conversion mechanism 170, and a mold thickness adjustment mechanism 180.

The toggle seat 130 is disposed at a distance from the fixed platen 110, and is mounted on the mold clamping device frame 910 so as to be movable in the mold opening/closing direction. The toggle seat 130 is movably disposed along a guide laid on the mold clamping unit frame 910. The guide of the toggle seat 130 may be common with the guide 101 of the movable platen 120.

In the present embodiment, the fixed platen 110 is fixed to the mold clamping device frame 910, and the toggle base 130 is disposed on the mold clamping device frame 910 so as to be movable in the mold opening and closing direction, but the toggle base 130 may be fixed to the mold clamping device frame 910, and the fixed platen 110 may be disposed on the mold clamping device frame 910 so as to be movable in the mold opening and closing direction.

The connecting rods 140 connect the fixed platen 110 and the toggle seats 130 with a space L therebetween in the mold opening and closing direction. A plurality of (e.g., 4) connecting rods 140 may be used. The plurality of tie bars 140 are arranged parallel to the mold opening and closing direction and extend according to the mold clamping force. A tie bar strain detector 141 that detects strain of the tie bar 140 may be provided to at least 1 tie bar 140. The tie-bar strain detector 141 transmits a signal indicating the detection result thereof to the control device 700. The detection result of the tie bar strain detector 141 is used for detection of the mold clamping force and the like.

In the present embodiment, the tie bar strain detector 141 is used as a mold clamping force detector for detecting a mold clamping force, but the present invention is not limited to this. The mold clamping force detector is not limited to the strain gauge type mold clamping force detector, and may be a piezoelectric type, a capacitive type, a hydraulic type, an electromagnetic type mold clamping force detector, or the like, and the attachment position thereof is not limited to the tie bar 140.

The toggle mechanism 150 is disposed between the movable platen 120 and the toggle base 130, and moves the movable platen 120 relative to the toggle base 130 in the mold opening and closing direction. The toggle mechanism 150 includes a cross 151 and a pair of links. Each of the pair of link groups includes a 1 st link 152 and a 2 nd link 153 connected by a pin or the like to be bendable and extendable. The 1 st link 152 is attached to the movable platen 120 by a pin or the like so as to be freely swingable. The 2 nd link 153 is pivotably attached to the toggle seat 130 by a pin or the like. The 2 nd link 153 is attached to the crosshead 151 via the 3 rd link 154. When the crosshead 151 is advanced and retracted with respect to the toggle seat 130, the 1 st link 152 and the 2 nd link 153 are extended and retracted, and the movable platen 120 is advanced and retracted with respect to the toggle seat 130.

The structure of the toggle mechanism 150 is not limited to the structure shown in fig. 1 and 2. For example, in fig. 1 and 2, the number of nodes of each link group is 5, but may be 4, and one end of the 3 rd link 154 may be coupled to the nodes of the 1 st link 152 and the 2 nd link 153.

The mold clamping motor 160 is attached to the toggle seat 130 and operates the toggle mechanism 150. The mold clamping motor 160 advances and retracts the crosshead 151 with respect to the toggle seat 130, thereby causing the 1 st link 152 and the 2 nd link 153 to flex and extend and causing the movable platen 120 to advance and retract with respect to the toggle seat 130. The mold clamping motor 160 is directly coupled to the motion conversion mechanism 170, but may be coupled to the motion conversion mechanism 170 via a belt, a pulley, or the like.

The motion conversion mechanism 170 converts the rotational motion of the mold clamping motor 160 into the linear motion of the crosshead 151. The motion conversion mechanism 170 includes a screw shaft and a screw nut screwed to the screw shaft. Balls or rollers may be interposed between the screw shaft and the screw nut.

The mold clamping device 100 performs a mold closing process, a pressure raising process, a mold clamping process, a pressure reducing process, a mold opening process, a mold rotating process, and the like under the control of the control device 700. The mold rotating process is performed after the mold opening process is completed and before the next mold closing process is started. In the present embodiment, the mold rotation step is performed after the completion of the extrusion step, but may be performed before the completion of the extrusion step. For example, when the position at which the 2 nd cavity space molded article 26 is molded is different from the position at which the 2 nd cavity space molded article 26 is pushed out, the mold rotating step is performed after the mold opening step is completed, and then the pushing-out step is performed. Specifically, for example, when the position where the 2 nd cavity space molded product 26 is molded is the operation side and the position where the 2 nd cavity space molded product 26 is pushed out is the opposite side to the operation side, the mold rotating step is performed after the mold opening step is completed, and then the pushing-out step is performed.

In the mold closing step, the mold clamping motor 160 is driven to advance the crosshead 151 to the mold closing completion position at the set movement speed, thereby advancing the movable platen 120 and bringing the movable mold 820 into contact with the fixed mold 810. For example, the position and the moving speed of the crosshead 151 are detected using a mold clamping motor encoder 161 or the like. The mold clamping motor encoder 161 detects the rotation of the mold clamping motor 160, and transmits a signal indicating the detection result to the control device 700.

A crosshead position detector that detects the position of the crosshead 151 and a crosshead travel speed detector that detects the travel speed of the crosshead 151 are not limited to the clamp motor encoder 161, and a general detector can be used. The movable platen position detector that detects the position of the movable platen 120 and the movable platen moving speed detector that detects the moving speed of the movable platen 120 are not limited to the clamp motor encoder 161, and a general detector can be used.

In the pressure raising step, the mold clamping motor 160 is further driven to further advance the crosshead 151 from the mold closing completion position to the mold clamping position, thereby generating a mold clamping force.

In the mold clamping process, the mold clamping motor 160 is driven to maintain the position of the crosshead 151 at the mold clamping position. In the mold clamping step, the mold clamping force generated in the pressure increasing step is maintained. In the mold clamping step, the 1 st mold portion 801 and the 2 nd mold portion 805 are formed between the movable mold 820 and the fixed mold 810.

In the depressurizing step, the clamping motor 160 is driven to retract the crosshead 151 from the clamping position to the mold opening start position, thereby retracting the movable platen 120 and reducing the clamping force. The mold opening start position and the mold closing completion position may be the same position.

In the mold opening step, the mold closing motor 160 is driven to retract the crosshead 151 from the mold opening start position to the mold opening completion position at a set movement speed, thereby retracting the movable platen 120 and separating the movable mold 820 from the fixed mold 810.

The push-out process is performed after the completion of the mold opening process and before the start of the next mold closing process. In the push-out step, the ejector 200 pushes the 1 st runner molded product 23 out of the mold main body 830 of the movable mold 820. The 1 st cavity space molded article 22 is not pushed out together with the 1 st runner molded article 23. In the pushing step, the ejector 200 pushes the 2 nd cavity space molded product 26 out of the mold body 830 of the driven mold 820. After the completion of the ejection process and before the start of the next mold closing process, a mold rotation process is performed.

In the mold rotating step, the table 520 is rotated, and the 1 st cavity space molded article 22 is rotated together with the movable mold 820. Then, the mold closing step and the pressure raising step are performed, and the 1 st cavity space molded article 22 is disposed in a part of the 2 nd molding section 805.

The setting conditions in the mold closing step, the pressure raising step, and the mold clamping step are set together as a series of setting conditions. For example, the moving speed, the position (including the mold closing start position, the moving speed switching position, the mold closing completion position, and the mold clamping position) and the mold clamping force of the crosshead 151 in the mold closing step and the pressure raising step are set together as a series of setting conditions. The mold closing start position, the moving speed switching position, the mold closing completion position, and the mold clamping position are arranged in order from the rear side toward the front side, and indicate the start point and the end point of a section in which the moving speed is set. The moving speed is set for each section. The moving speed switching position may be 1 or plural. The moving speed switching position may not be set. The mold clamping position and the mold clamping force may be set to only one of them.

The setting conditions in the pressure reducing step and the mold opening step are also set in the same manner. For example, the moving speed and the position (the mold opening start position, the moving speed switching position, and the mold opening completion position) of the crosshead 151 in the pressure reducing step and the mold opening step are set together as a series of setting conditions. The mold opening start position, the moving speed switching position, and the mold opening completion position are arranged in order from the front side toward the rear side, and indicate the start point and the end point of a section in which the moving speed is set. The moving speed is set for each section. The moving speed switching position may be 1 or plural. The moving speed switching position may not be set. The mold opening start position and the mold closing completion position may be the same position. The mold opening completion position and the mold closing start position may be the same position.

Instead of the moving speed, the position, and the like of the crosshead 151, the moving speed, the position, and the like of the movable platen 120 may be set. The clamping force may be set instead of the position of the crosshead (for example, the clamping position) or the position of the movable platen.

The toggle mechanism 150 amplifies the driving force of the mold clamping motor 160 and transmits it to the movable platen 120. Its magnification is also referred to as the toggle magnification. The toggle magnification is changed according to an angle θ formed by the 1 st link 152 and the 2 nd link 153 (hereinafter, also referred to as "link angle θ"). The link angle θ is obtained from the position of the crosshead 151. When the link angle θ is 180 °, the toggle magnification becomes maximum.

When the thickness of the mold apparatus 800 changes due to, for example, replacement of the mold apparatus 800 or a change in temperature of the mold apparatus 800, the mold thickness is adjusted so that a predetermined mold clamping force is obtained at the time of mold clamping. In the mold thickness adjustment, for example, the interval L between the fixed platen 110 and the toggle seat 130 is adjusted so that the link angle θ of the toggle mechanism 150 becomes a predetermined angle at the time when the movable mold 820 comes into contact with the mold of the fixed mold 810.

The mold clamping device 100 includes a mold thickness adjusting mechanism 180. The die thickness adjustment mechanism 180 adjusts the die thickness by adjusting the interval L between the fixed platen 110 and the toggle seat 130. The time for adjusting the die thickness is, for example, a period from the end of the molding cycle to the start of the next molding cycle. The die thickness adjusting mechanism 180 includes, for example, a screw shaft 181 formed at the rear end portion of the connecting rod 140, a screw nut 182 held by the toggle base 130 so as to be rotatable and incapable of advancing and retreating, and a die thickness adjusting motor 183 for rotating the screw nut 182 screwed to the screw shaft 181.

A screw shaft 181 and a screw nut 182 are provided to each connecting rod 140. The rotational driving force of the die thickness adjusting motor 183 can be transmitted to the plurality of lead screw nuts 182 via the rotational driving force transmitting portion 185. The plurality of lead screw nuts 182 can be rotated in synchronization. Further, the plurality of screw nuts 182 can be rotated individually by changing the transmission path of the rotational driving force transmission portion 185.

The rotational driving force transmission portion 185 is formed of, for example, a gear. In this case, a driven gear is formed on the outer periphery of each screw nut 182, a drive gear is attached to the output shaft of the die thickness adjusting motor 183, and an intermediate gear that meshes with the plurality of driven gears and the drive gear is rotatably held in the center portion of the toggle seat 130. In addition, the rotational driving force transmitting portion 185 may be constituted by a belt, a pulley, and the like instead of the gear.

The operation of the die thickness adjusting mechanism 180 is controlled by the control device 700. The controller 700 drives the die thickness adjustment motor 183 to rotate the lead screw nut 182. As a result, the position of the toggle seat 130 with respect to the connecting rod 140 is adjusted, and the interval L between the fixed platen 110 and the toggle seat 130 is adjusted. In addition, a plurality of die thickness adjusting mechanisms may be used in combination.

The interval L is detected using the die thickness adjustment motor encoder 184. The mold thickness adjusting motor encoder 184 detects the rotation amount and the rotation direction of the mold thickness adjusting motor 183, and transmits a signal indicating the detection result to the control device 700. The detection result of the die thickness adjustment motor encoder 184 is used for monitoring and controlling the position and the interval L of the toggle seat 130. The toggle seat position detector for detecting the position of the toggle seat 130 and the interval detector for detecting the interval L are not limited to the mold thickness adjusting motor encoder 184, and a general detector can be used.

The mold clamping device 100 of the present embodiment is a horizontal type mold clamping device in which the mold opening and closing direction is the horizontal direction, but may be a vertical type mold clamping device in which the mold opening and closing direction is the vertical direction.

The mold clamping apparatus 100 of the present embodiment has the mold clamping motor 160 as a drive source, but may have a hydraulic cylinder instead of the mold clamping motor 160. The mold clamping device 100 may have a linear motor for opening and closing the mold and an electromagnet for clamping the mold.

(Ejection device)

In the description of the ejector 200, similarly to the description of the mold clamping apparatus 100, the moving direction of the movable platen 120 (for example, the positive X-axis direction) during mold closing is set as the front side, and the moving direction of the movable platen 120 (for example, the negative X-axis direction) during mold opening is set as the rear side. The ejector 200 advances and retreats together with the movable platen 120.

As shown in fig. 4 and 6, the ejector 200 includes a 1 st ejector rod 210. When the table 520 rotates, the 1 st knock-out lever 210 stands by at the rear of the table 520 so as not to interfere with the table 520. After the table 520 is rotated, the 1 st knock-out lever 210 advances and enters the inside of the table 520. As a result, the 1 st bead molded product 23 is pushed out, as will be described later in detail. Then, the 1 st knock-out lever 210 retreats and retreats from the table 520.

The ejector 200 has a 1 st driving mechanism 211 for advancing and retreating a 1 st ejector rod 210. The 1 st driving mechanism 211 includes, for example, a 1 st eject motor 212, a 1 st cross head 214, and a 1 st motion conversion mechanism 216 that converts the rotational motion of the 1 st eject motor 212 into the linear motion of the 1 st cross head 214.

The 1 st motion conversion mechanism 216 includes a screw shaft and a screw nut screwed to the screw shaft. Balls or rollers may be interposed between the screw shaft and the screw nut. The 1 st cross head 214 moves in the mold opening and closing direction along the 1 st guide rod 215. The rear end portion of the 1 st ejector rod 210 is attached to the 1 st crosshead 214, and the 1 st ejector rod 210 advances and retreats together with the 1 st crosshead 214.

When the 1 st knock-out lever 210 is advanced and retreated, the control device 700 controls the position of the 1 st knock-out lever 210. The position of the 1 st eject lever 210 is detected using, for example, the 1 st eject motor encoder 213. The 1 st eject motor encoder 213 detects the rotation of the 1 st eject motor 212, and transmits a signal indicating the detection result to the control device 700. The 1 st ejector rod position detector for detecting the position of the 1 st ejector rod 210 is not limited to the 1 st ejector motor encoder 213, and a normal position detector may be used.

The ejector 200 has a 2 nd ejector rod 220. When the table 520 rotates, the 2 nd ejector lever 220 stands by at the rear of the table 520 so as not to interfere with the table 520. After the table 520 is rotated, the 2 nd ejector rod 220 advances and enters the inside of the table 520. As a result, the 2 nd cavity space molded product 26 is pushed out, as will be described later in detail. Then, the 2 nd ejector rod 220 retreats and is withdrawn from the table 520.

The ejector 200 has a 2 nd driving mechanism 221 for advancing and retreating the 2 nd ejector rod 220. The 2 nd driving mechanism 221 includes, for example, a 2 nd eject motor 222, a 2 nd cross head 224, and a 2 nd motion conversion mechanism 226 that converts the rotational motion of the 2 nd eject motor 222 into the linear motion of the 2 nd cross head 224.

The 2 nd motion conversion mechanism 226 includes a screw shaft and a screw nut screwed with the screw shaft. Balls or rollers may be interposed between the screw shaft and the screw nut. The 2 nd cross head 224 moves in the mold opening and closing direction along the 2 nd guide bar 225. The rear end portion of the 2 nd ejector rod 220 is attached to the 2 nd crosshead 224, and the 2 nd ejector rod 220 advances and retreats together with the 2 nd crosshead 224.

When the 2 nd ejector rod 220 is advanced and retreated, the control device 700 controls the position of the 2 nd ejector rod 220. The position of the 2 nd ejector rod 220 is detected using, for example, the 2 nd ejector motor encoder 223. The 2 nd ejection motor encoder 223 detects the rotation of the 2 nd ejection motor 222, and transmits a signal indicating the detection result to the control device 700. The 2 nd ejector rod position detector that detects the position of the 2 nd ejector rod 220 is not limited to the 2 nd ejector motor encoder 223, and a normal position detector can be used.

The ejector 200 has a 1 st drive mechanism 211 and a 2 nd drive mechanism 221. Accordingly, the control device 700 can individually control the advance and retreat of the 1 st ejector rod 210 and the advance and retreat of the 2 nd ejector rod 220. The ejection of the 2 nd cavity space molded product 26 and the ejection of the 1 st runner molded product 23 can be controlled individually.

For example, the control device 700 sets the forward speed of the 2 nd ejector lever 220 to be lower than the forward speed of the 1 st ejector lever 210. Since the 2 nd cavity space molded product 26 is slowly pushed out, the stress acting on the 2 nd cavity space molded product 26 at the time of pushing out can be reduced, and the quality degradation of the 2 nd cavity space molded product 26 can be suppressed.

When the 2 nd ejection lever 220 advances, the control device 700 monitors the torque of the 2 nd ejection motor 222. When the torque of the 2 nd ejector motor 222 exceeds the upper limit value, the control device 700 sets the forward speed of the 2 nd ejector rod 220 to be slower than the set speed so that the torque becomes equal to or lower than the upper limit value.

The upper limit of the torque of the 2 nd ejection motor 222 is set, for example, based on the relationship between the stress applied to the 2 nd cavity space molded product 26 at the time of ejection and the fraction defective of the 2 nd cavity space molded product 26. The upper limit of the torque of the 2 nd ejection motor 222 is set to be smaller than the upper limit of the torque of the 1 st ejection motor 212.

In addition, the 1 st driving mechanism 211 may have a 1 st hydraulic cylinder instead of the combination of the 1 st ejection motor 212 and the 1 st motion conversion mechanism 216. Likewise, the 2 nd drive mechanism 221 may have a 2 nd hydraulic cylinder instead of the combination of the 2 nd ejection motor 222 and the 2 nd motion conversion mechanism 226.

A common drive mechanism may be used in the 1 st ejector rod 210 and the 2 nd ejector rod 220. The driving mechanism advances and retracts both the 1 st and 2 nd ejector rods 210 and 220 by 1 ejector motor or 1 hydraulic cylinder, for example. The cost of the drive mechanism can be reduced.

The 1 st ejector rod 210 and the 2 nd ejector rod 220 are disposed at intervals in the Y axis direction. This is because the 1 st molding portion 801 and the 2 nd molding portion 805 are arranged with a gap in the Y axis direction.

For example, the 1 st molding portion 801 and the 1 st knock-out lever 210 are disposed on the operation side. The 2 nd molding section 805 and the 2 nd ejector rod 220 are disposed on the opposite side to the operation side. The 2 nd cavity space molded product 26 can be taken out on the opposite side of the operation.

(1 st and 2 nd injection devices)

In the explanation of the 1 st injection device 301 and the 2 nd injection device 302, unlike the explanation of the mold clamping device 100 and the like, the moving direction of the screw 330 during filling (for example, the X-axis negative direction) is assumed to be the front side, and the moving direction of the screw 330 during metering (for example, the X-axis positive direction) is assumed to be the rear side.

The 1 st injection device 301 is provided on the 1 st slide base 303, and the 1 st slide base 303 is disposed to be movable forward and backward with respect to the injection device frame 920. The 1 st injection device 301 is disposed to be movable forward and backward with respect to the mold device 800. The 1 st injection device 301 contacts the mold device 800 (more specifically, the stationary mold 810) and fills the 1 st molding part 801 in the mold device 800 with the molding material.

The 2 nd injection device 302 is provided on the 2 nd slide base, and the 2 nd slide base is disposed to be movable forward and backward with respect to the injection device frame 920. The 2 nd injection device 302 is disposed to be movable forward and backward with respect to the mold device 800. The 2 nd injection device 302 contacts the mold device 800 (more specifically, the stationary mold 810) and fills the molding material into the 2 nd molding part 805 in the mold device 800.

The 1 st injection device 301 and the 2 nd injection device 302 are disposed at intervals in the Y axis direction. This is because the 1 st molding portion 801 and the 2 nd molding portion 805 are arranged with a gap in the Y axis direction. The molding material filled in the 1 st molding portion 801 by the 1 st injection device 301 and the molding material filled in the 2 nd molding portion 805 by the 2 nd injection device 302 may be different materials or the same material.

The 1 st injection device 301 and the 2 nd injection device 302 are constructed in the same manner. Therefore, the structure of the 1 st injection device 301 will be described below, and the structure of the 2 nd injection device 302 will not be described. As shown in fig. 1 and 2, the 1 st injection device 301 includes, for example, a cylinder 310, a nozzle 320, a screw 330, a metering motor 340, an injection motor 350, a pressure detector 360, and the like.

The cylinder 310 heats the molding material supplied from the supply port 311 to the inside. The molding material includes, for example, resin. The molding material is, for example, formed into a granular shape and supplied to the supply port 311 in a solid state. The supply port 311 is formed at the rear of the cylinder 310. A cooler 312 such as a water-cooled cylinder is provided on the outer periphery of the rear portion of the cylinder block 310. A heater 313 such as a band heater and a temperature detector 314 are provided on the outer periphery of the cylinder 310 in front of the cooler 312.

The cylinder 310 is divided into a plurality of regions in the axial direction (for example, the X-axis direction) of the cylinder 310. A heater 313 and a temperature detector 314 are provided in each of the plurality of zones. A set temperature is set in each of the plurality of zones, and control device 700 controls heater 313 so that the temperature detected by temperature detector 314 becomes the set temperature.

The nozzle 320 is provided at the front end of the cylinder 310 and is press-fitted to the mold apparatus 800. A heater 313 and a temperature detector 314 are provided on the outer periphery of the nozzle 320. The control device 700 controls the heater 313 so that the temperature detected by the nozzle 320 becomes the set temperature.

The screw 330 is disposed in the cylinder 310 so as to be freely rotatable and movable forward and backward. When the screw 330 is rotated, the molding material is conveyed forward along the spiral groove of the screw 330. The molding material is gradually melted by heat from the cylinder 310 while being conveyed forward. As the liquid molding material is conveyed to the front of the screw 330 and stored in the front of the cylinder 310, the screw 330 is retreated. Then, when the screw 330 is advanced, the liquid molding material stored in front of the screw 330 is injected from the nozzle 320 and is filled into the mold apparatus 800.

A check ring 331 is attached to the front portion of the screw 330 to be movable forward and backward as a check valve for preventing the molding material from flowing backward from the front of the screw 330 when the screw 330 is pushed forward.

When the screw 330 is advanced, the check ring 331 is pushed rearward by the pressure of the molding material in front of the screw 330 and relatively retreats with respect to the screw 330 to a closed position (refer to fig. 2) blocking the flow path of the molding material. This prevents the molding material stored in front of the screw 330 from flowing backward.

On the other hand, when the screw 330 is rotated, the check ring 331 is pushed forward by the pressure of the molding material conveyed forward along the spiral groove of the screw 330, and relatively advances with respect to the screw 330 to an open position (refer to fig. 1) where the flow path of the molding material is opened. Thereby, the molding material is conveyed to the front of the screw 330.

The check ring 331 may be of a co-rotating type that rotates together with the screw 330 and a non-co-rotating type that does not rotate together with the screw 330.

The 1 st injection device 301 may further include a drive source for advancing and retracting the check ring 331 relative to the screw 330 between the open position and the closed position.

The metering motor 340 rotates the screw 330. The driving source for rotating the screw 330 is not limited to the metering motor 340, and may be, for example, a hydraulic pump.

The injection motor 350 advances and retracts the screw 330. A motion conversion mechanism or the like that converts the rotational motion of the injection motor 350 into the linear motion of the screw 330 is provided between the injection motor 350 and the screw 330. The motion conversion mechanism includes, for example, a screw shaft and a screw nut screwed to the screw shaft. Balls, rollers, etc. may be provided between the screw shaft and the screw nut. The driving source for advancing and retracting the screw 330 is not limited to the injection motor 350, and may be, for example, a hydraulic cylinder.

The pressure detector 360 detects the pressure transmitted between the injection motor 350 and the screw 330. The pressure detector 360 is provided in a pressure transmission path between the injection motor 350 and the screw 330, and detects a pressure acting on the pressure detector 360.

The pressure detector 360 transmits a signal indicating the detection result to the control device 700. The detection result of the pressure detector 360 is used for controlling and monitoring the pressure applied to the screw 330 from the molding material, the back pressure applied to the screw 330, the pressure applied to the molding material from the screw 330, and the like.

The 1 st injection device 301 performs a metering step, a filling step, a pressure holding step, and the like under the control of the control device 700. The filling process and the pressure holding process are also collectively referred to as an injection process.

In the metering step, the metering motor 340 is driven to rotate the screw 330 at a predetermined rotation speed, and the molding material is conveyed forward along the spiral groove of the screw 330. With this, the molding material gradually melts. As the liquid molding material is conveyed to the front of the screw 330 and stored in the front of the cylinder 310, the screw 330 is retreated. The rotational speed of the screw 330 is detected, for example, using a metering motor encoder 341. The metering motor encoder 341 detects the rotation of the metering motor 340, and transmits a signal indicating the detection result to the control device 700. The screw rotation speed detector for detecting the rotation speed of the screw 330 is not limited to the metering motor encoder 341, and a general screw rotation speed detector can be used.

In the metering step, the injection motor 350 may be driven to apply a predetermined back pressure to the screw 330 in order to restrict the screw 330 from rapidly moving backward. The back pressure to the screw 330 is detected, for example, using a pressure detector 360. The pressure detector 360 transmits a signal indicating the detection result to the control device 700. When the screw 330 is retracted to the metering completion position and a predetermined amount of molding material is stored in front of the screw 330, the metering process is completed.

The position and the rotation speed of the screw 330 in the metering step are set as a series of setting conditions. For example, a measurement start position, a rotation speed switching position, and a measurement completion position are set. These positions are arranged in order from the front side to the rear side, and indicate the start point and the end point of the section in which the rotation speed is set. The rotation speed is set for each interval. The number of rotation speed switching positions may be 1 or more. The rotational speed switching position may not be set. Further, the back pressure is set for each section.

In the filling step, the injection motor 350 is driven to advance the screw 330 at a set moving speed, and the liquid molding material stored in front of the screw 330 is filled in the 1 st molding portion 801 in the mold apparatus 800. The position and the moving speed of the screw 330 are detected by using, for example, an injection motor encoder 351. The injection motor encoder 351 detects the rotation of the injection motor 350, and transmits a signal indicating the detection result to the control device 700. When the position of the screw 330 reaches the set position, switching from the filling step to the holding pressure step (so-called V/P switching) is performed. The position where the V/P switching is performed is also referred to as a V/P switching position. The set moving speed of the screw 330 may be changed according to the position, time, and the like of the screw 330.

The position and the moving speed of the screw 330 in the filling process are set as a series of setting conditions. For example, a filling start position (also referred to as an "injection start position"), a movement speed switching position, and a V/P switching position are set. These positions are arranged in order from the rear side to the front side, and indicate the start point and the end point of the section in which the moving speed is set. The moving speed is set for each section. The moving speed switching position may be 1 or plural. The moving speed switching position may not be set.

The upper limit value of the pressure of the screw 330 is set for each section in which the moving speed of the screw 330 is set. The pressure of the screw 330 is detected by a pressure detector 360. When the detection value of the pressure detector 360 is equal to or less than the set pressure, the screw 330 moves forward at the set moving speed. On the other hand, when the detection value of the pressure detector 360 exceeds the set pressure, the screw 330 is advanced at a moving speed slower than the set moving speed so that the detection value of the pressure detector 360 becomes equal to or lower than the set pressure for the purpose of protecting the mold.

In the filling step, after the position of the screw 330 reaches the V/P switching position, the screw 330 may be temporarily stopped at the V/P switching position and then V/P switched. Instead of stopping the screw 330, low-speed forward movement or low-speed reverse movement of the screw 330 may be performed immediately before the V/P switching. The screw position detector for detecting the position of the screw 330 and the screw movement speed detector for detecting the movement speed of the screw 330 are not limited to the injection motor encoder 351, and a general screw position detector can be used.

In the pressure retaining step, the injection motor 350 is driven to push the screw 330 forward, the pressure of the molding material at the tip end of the screw 330 (hereinafter also referred to as "holding pressure") is held at a set pressure, and the molding material remaining in the cylinder 310 is pressed toward the mold apparatus 800. The molding material can be replenished in an insufficient amount due to cooling shrinkage in the mold apparatus 800. The holding pressure is detected, for example, using a pressure detector 360. The pressure detector 360 transmits a signal indicating the detection result to the control device 700. The set value of the holding pressure may be changed according to the elapsed time after the start of the pressure holding step. The holding pressure and the holding time for holding the holding pressure in the holding pressure step may be set in plural numbers, respectively, or may be set collectively as a series of setting conditions.

In the pressure retaining step, the molding material in the 1 st cavity space 802 in the mold apparatus 800 is gradually cooled, and when the pressure retaining step is completed, the entrance of the 1 st cavity space 802 is blocked by the solidified molding material. This condition is referred to as gate sealing and prevents the reverse flow of molding material from the 1 st cavity space 802. After the pressure holding step, the cooling step is started. In the cooling step, the molding material in the 1 st cavity space 802 is solidified. The solidification of the molding material in the 1 st communicating space 803 is also performed in the cooling step. The metering step may be performed in the cooling step for the purpose of shortening the molding cycle time.

The injection device 301 of the first embodiment is a coaxial screw injection device, but may be a pre-injection type injection device or the like. The pre-molding type injection device supplies the molding material melted in the plasticizing cylinder to the injection cylinder, and injects the molding material from the injection cylinder into the mold device. In the plasticizing cylinder, the screw is disposed to be rotatable and incapable of advancing and retreating, or the screw is disposed to be rotatable and capable of advancing and retreating. On the other hand, the plunger is disposed to be movable forward and backward in the injection cylinder.

Further, the 1 st injection device 301 of the present embodiment is a horizontal type injection device in which the axial direction of the cylinder 310 is the horizontal direction, but may be a vertical type injection device in which the axial direction of the cylinder 310 is the vertical direction. The mold clamping device combined with the 1 st injection device 301 may be a vertical mold clamping device or a horizontal mold clamping device. Similarly, the mold clamping device combined with the horizontal type 1 st injection device 301 may be a horizontal type mold clamping device or a vertical type mold clamping device.

(1 st and 2 nd mobile devices)

In the explanation of the 1 st transfer device 401 and the 2 nd transfer device (not shown), similarly to the explanation of the 1 st injection device 301 and the 2 nd injection device 302, the explanation will be given with the moving direction (for example, the X-axis negative direction) of the screw 330 at the time of filling as the front and the moving direction (for example, the X-axis positive direction) of the screw 330 at the time of metering as the rear.

The 1 st moving device 401 advances and retracts the 1 st injection device 301 with respect to the mold device 800. Also, the 1 st moving device 401 presses the nozzle 320 of the 1 st injection device 301 against the mold device 800 to generate a nozzle contact pressure.

The 2 nd moving device advances and retracts the 2 nd injection device 302 with respect to the mold device 800. And, the 2 nd moving means presses the nozzle of the 2 nd injection device 302 against the mold device 800 to generate the nozzle contact pressure.

The 1 st moving device 401 and the 2 nd moving device are disposed at intervals in the Y axis direction. The 1 st moving device 401 and the 2 nd moving device independently advance and retreat the 1 st injection device 301 and the 2 nd injection device 302.

The 1 st mobile device 401 and the 2 nd mobile device are configured in the same manner. Therefore, the configuration of the 1 st mobile device 401 will be described below, and the configuration of the 2 nd mobile device will not be described. As shown in fig. 1 and 2, the 1 st moving device 401 includes a hydraulic pump 410, a motor 420 as a drive source, a hydraulic cylinder 430 as a hydraulic actuator, and the like.

The hydraulic pump 410 has a 1 st port 411 and a 2 nd port 412. The hydraulic pump 410 is a pump capable of rotating in both directions, and generates hydraulic pressure by switching the rotation direction of the motor 420, sucking in hydraulic fluid (for example, oil) from one of the 1 st port 411 and the 2 nd port 412, and discharging the hydraulic fluid from the other port. The hydraulic pump 410 can also suck the hydraulic fluid from the tank and discharge the hydraulic fluid from any one of the 1 st port 411 and the 2 nd port 412.

The motor 420 operates the hydraulic pump 410. The motor 420 drives the hydraulic pump 410 in a rotational direction and torque according to a control signal from the control device 700. The motor 420 may be an electric motor or an electric servomotor.

The cylinder 430 includes a cylinder body 431, a piston 432, and a piston rod 433. The cylinder body 431 is fixed to the 1 st injection device 301. The piston 432 divides the interior of the cylinder body 431 into a front chamber 435 as a 1 st chamber and a rear chamber 436 as a 2 nd chamber. The piston rod 433 is fixed to the stationary platen 110.

The front chamber 435 of the hydraulic cylinder 430 is connected to the 1 st port 411 of the hydraulic pump 410 via the 1 st flow path 413. The working fluid discharged from the 1 st port 411 is supplied to the front chamber 435 through the 1 st channel 413, whereby the 1 st injection device 301 is pushed forward. The 1 st injection device 301 advances and the nozzle 320 of the 1 st injection device 301 is pressed against the stationary mold 810. Front chamber 435 functions as a pressure chamber for generating a nozzle contact pressure of nozzle 320 by the pressure of the hydraulic fluid supplied from hydraulic pump 410.

On the other hand, the rear chamber 436 of the hydraulic cylinder 430 is connected to the 2 nd port 412 of the hydraulic pump 410 via the 2 nd flow path 414. The working fluid discharged from the 2 nd port 412 is supplied to the rear chamber 436 of the hydraulic cylinder 430 through the 2 nd flow path 414, whereby the 1 st injection device 301 is pushed rearward. The 1 st injection device 301 retreats and the nozzle 320 of the 1 st injection device 301 is separated from the stationary mold 810.

In the present embodiment, the 1 st moving device 401 includes the hydraulic cylinder 430, but the present invention is not limited thereto. For example, an electric motor and a motion conversion mechanism that converts the rotational motion of the electric motor into the linear motion of the 1 st injection device 301 may be used instead of the hydraulic cylinder 430.

(control device)

The control device 700 is constituted by a computer, for example, and as shown in fig. 1 to 2, includes a CPU (central Processing Unit) 701, a storage medium 702 such as a memory, an input interface 703, and an output interface 704. The control device 700 performs various controls by causing the CPU701 to execute a program stored in the storage medium 702. The control device 700 receives a signal from the outside through the input interface 703 and transmits the signal to the outside through the output interface 704.

The controller 700 repeats a metering process, a mold closing process, a pressure increasing process, a mold closing process, a filling process, a pressure maintaining process, a cooling process, a pressure reducing process, a mold opening process, a pushing process, a mold rotating process, and the like, thereby repeatedly manufacturing the 1 st molded article 21 and the 2 nd molded article 25. The series of operations for obtaining the 1 st molded article 21 and the 2 nd molded article 25, for example, the operations from the start of the metering step to the start of the next metering step, are also referred to as "shot" or "molding cycle". Also, the time required for 1 shot is also referred to as "molding cycle time" or "cycle time".

The one-shot molding cycle includes, for example, a metering step, a mold closing step, a pressure raising step, a mold closing step, a filling step, a pressure maintaining step, a cooling step, a pressure reducing step, a mold opening step, a pushing step, and a mold rotating step in this order. The sequence here is the order of starting the respective steps. The filling process, the pressure maintaining process and the cooling process are performed during the mold clamping process. The start of the mold clamping process may coincide with the start of the filling process. The end of the pressure reduction process coincides with the start of the mold opening process.

In addition, a plurality of steps can be performed simultaneously for the purpose of shortening the molding cycle time. For example, the metering step may be performed in the cooling step of the previous molding cycle, or may be performed during the mold clamping step. In this case, the mold closing step may be performed at the beginning of the molding cycle. Also, the filling process may be started in the mold closing process. The push-out process may be started in the mold opening process. In the case where an opening and closing valve that opens and closes the flow path of the nozzle 320 is provided, the mold opening process may be started in the metering process. This is because, even if the mold opening step is started in the metering step, the molding material does not leak from the nozzle 320 when the flow path of the nozzle 320 is closed by the opening and closing valve.

The one-shot molding cycle may include steps other than a metering step, a mold closing step, a pressure raising step, a mold closing step, a filling step, a pressure maintaining step, a cooling step, a pressure reducing step, a mold opening step, a pushing step, and a mold rotating step.

For example, after the pressure holding step is completed and before the metering step is started, a pre-metering suck-back step of moving the screw 330 backward to a preset metering start position may be performed. The pressure of the molding material stored in front of the screw 330 before the start of the metering process can be reduced, and the screw 330 can be prevented from rapidly retreating at the start of the metering process.

After the metering process is completed and before the filling process is started, a post-metering suck-back process of moving the screw 330 backward to a preset filling start position (also referred to as an "injection start position") may be performed. The pressure of the molding material stored in front of the screw 330 before the filling process starts can be reduced, and the molding material can be prevented from leaking from the nozzle 320 before the filling process starts.

Control device 700 is connected to operation device 750 and display device 760. Operation device 750 receives an input operation by a user, and outputs a signal corresponding to the input operation to control device 700. Display device 760 displays a display screen corresponding to an input operation in operation device 750, under the control of control device 700.

The display screen is used for setting the injection molding machine 10. A plurality of display screens are prepared, and display is switched or overlapped. The user operates operation device 750 while viewing the display screen displayed on display device 760, thereby performing settings (including input of set values) of injection molding machine 10.

The operation device 750 and the display device 760 may be formed of a touch panel, for example, and may be integrated. The operation device 750 and the display device 760 of the present embodiment are integrated, but may be provided separately. Also, a plurality of operating devices 750 may be provided. The operation device 750 and the display device 760 are disposed on the Y-axis direction negative side of the mold clamping device 100 (more specifically, the fixed platen 110). The Y-direction negative side is referred to as an operation side, and the Y-direction positive side is referred to as an opposite operation side.

(working table pin)

First, the structure of the table 520 will be described with reference to fig. 3 to 7. The table 520 includes, for example, a die attaching portion 521, a disc portion 522, and a cylindrical portion 523.

The movable die 820 is attached to the die attaching portion 521. The die attaching portion 521 is formed in a plate shape perpendicular to the die opening and closing direction. Since the movable mold 820 is often formed in a rectangular shape when viewed from the mold opening and closing direction, the mold mounting portion 521 is also formed in a rectangular shape.

In addition, the movable mold 820 is formed in a rectangular shape when viewed from the mold opening and closing direction because the 1 st movable molding surface 821 and the 2 nd movable molding surface 822 are formed in parallel with the long side of the movable mold 820 with an interval.

The disk portion 522 is formed in a plate shape perpendicular to the mold opening and closing direction. The disk portion 522 is formed in a circular shape when viewed from the mold opening and closing direction. The disc portion 522 is disposed between the die attaching portion 521 and the cylindrical portion 523.

The cylindrical portion 523 extends from the outer peripheral portion of the disk portion 522 to the X-axis direction negative side. The cylindrical portion 523 fixes the driven gear 535 in the entire circumferential direction. The driven gear 535 is a part of a transmission mechanism 532 that transmits the rotational driving force of the rotation motor 531 to the table 520.

A table penetration hole 524 penetrating the table 520 in the mold opening and closing direction is formed in the table 520. The table through-hole 524 passes through the die mounting portion 521 and the disc portion 522, for example.

A plurality of table through-holes 524 are arranged in rotational symmetry (for example, 180 ° rotational symmetry) about the rotation center line 520X of the table 520. The 1 st and 2 nd ejector rods 210 and 220 are inserted into and removed from the respective table through-holes 524 in sequence.

The injection molding machine 10 has a table pin 560 disposed inside the table 520. The table pin 560 includes, for example, a 1 st table pin 540 and a 2 nd table pin 550.

The 1 st stage pin 540 is disposed inside the stage 520 so as to be movable forward and backward in the mold opening and closing direction. Specifically, the 1 st stage pin 540 is disposed in the stage through-hole 524 so as to be movable forward and backward in the mold opening and closing direction. The 1 st table pin 540 rotates together with the table 520. The 1 st stage pin 540 is arranged in plural numbers so as to be rotationally symmetrical (for example, 180 ° rotational symmetry) about the rotation center line 520X of the stage 520.

The 2 nd table pin 550 is disposed inside the table 520 so as to be movable forward and backward in the mold opening and closing direction. Specifically, the 2 nd table pin 550 is disposed in the table through-hole 524 so as to be movable forward and backward in the mold opening and closing direction. The 2 nd table pin 550 rotates together with the table 520. The 2 nd table pin 550 is disposed in plural numbers so as to be rotationally symmetrical (for example, 180 ° rotational symmetry) about the rotation center line 520X of the table 520.

A through hole penetrating the 2 nd table pin 550 in the mold opening and closing direction is formed in the 2 nd table pin 550. Inside the through hole, the 1 st table pin 540 is disposed to be movable forward and backward. The 1 st table pin 540 and the 2 nd table pin 550 are disposed inside the same table through hole 524. The number of the table through-holes 524 can be reduced, the structure of the table 520 can be simplified, and the manufacturing cost of the table 520 can be reduced.

As shown in fig. 7, the 1 st table pin 540 coaxially includes a 1 st large diameter shaft portion 541 and a 1 st small diameter shaft portion 542 having a smaller diameter than the 1 st large diameter shaft portion 541. The 1 st small-diameter shaft portion 542 is disposed rearward (on the X-axis direction negative side) of the 1 st large-diameter shaft portion 541. A 1 st bush 543 having an outer diameter larger than that of the 1 st large diameter shaft portion 541 is fixed to the 1 st small diameter shaft portion 542. The outer peripheral surface of the 1 st bush 543 slidably contacts the inner peripheral surface of the cylindrical 2 nd table pin 550 (more specifically, the 2 nd large diameter shaft 551 described later).

The 2 nd table pin 550 coaxially has a 2 nd large diameter shaft 551 and a 2 nd small diameter shaft 552 having an outer diameter smaller than that of the 2 nd large diameter shaft 551. The 2 nd small diameter shaft portion 552 is disposed rearward (on the X axis direction negative side) of the 2 nd large diameter shaft portion 551. A2 nd bush 553 having an outer diameter larger than that of the 2 nd large diameter shaft 551 is fixed to the 2 nd small diameter shaft 552. The outer circumferential surface of the 2 nd bush 553 slidably contacts a hole wall surface of the table penetration hole 524 (more specifically, a large diameter hole 525 described later).

The 2 nd large-diameter shaft 551 is formed in a cylindrical shape, and the 1 st large-diameter shaft 541 is disposed inside thereof so as to be freely advanced and retracted. A 3 rd bushing 554 is fixed to an inner peripheral surface of the 2 nd large diameter shaft portion 551. The inner circumferential surface of the 3 rd bush 554 is in sliding contact with the outer circumferential surface of the 1 st table pin 540 (more specifically, the 1 st large diameter shaft portion 541). The 3 rd bushing 554 acts as a stopper. The 3 rd bush 554 abuts on the front end surface of the 1 st bush 543, thereby preventing the 1 st table pin 540 from coming out forward from the 2 nd table pin 550.

The 2 nd small diameter shaft portion 552 is formed in a cylindrical shape, and the 1 st small diameter shaft portion 542 is disposed inside thereof so as to be freely advanced and retracted. The inner diameter of the 2 nd small diameter shaft portion 552 is smaller than the inner diameter of the 2 nd large diameter shaft portion 551. A step surface 555 is formed between the inner peripheral surface of the 2 nd small diameter shaft portion 552 and the inner peripheral surface of the 2 nd large diameter shaft portion 551. The step surface 555 functions as a stopper. The stepped surface 555 abuts on the rear end surface of the 1 st bushing 543, thereby preventing the 1 st table pin 540 from coming out of the 2 nd table pin 550 to the rear.

The table insertion hole 524 has a large diameter hole 525 and a small diameter hole 526 having a smaller diameter than the large diameter hole 525. The small diameter hole 526 is disposed behind (on the negative side in the X-axis direction) the large diameter hole 525. A bush 529 is fixed to a hole wall surface of the large-diameter hole portion 525 by a bush fixing tool 528 or the like. The inner circumferential surface of the bushing 529 is in sliding contact with the outer circumferential surface of the 2 nd table pin 550 (more specifically, the 2 nd large-diameter shaft 551). The bushing 529 functions as a stopper. The bushing 529 abuts against the front end surface of the 2 nd bushing 553, thereby preventing the 2 nd table pin 550 from coming out of the table 520 in the forward direction.

The 2 nd small diameter shaft portion 552 is disposed in the small diameter hole portion 526 so as to be movable forward and backward. The small diameter hole 526 has a smaller diameter than the large diameter hole 525. A step surface 527 is formed between the hole wall surface of the small-diameter hole portion 526 and the hole wall surface of the large-diameter hole portion 525. The step face 527 functions as a stopper. The stepped surface 527 abuts against the rear end surface of the 2 nd bush 553, thereby preventing the 2 nd table pin 550 from coming out of the table 520 in the rear direction.

Next, the structure of the movable mold 820 will be described mainly with reference to fig. 4, 6, and 7. The movable mold 820 includes a mold main body 830 attached to the table 520 and a movable portion 860 disposed inside the mold main body 830 and used for pushing out a molded product. The movable section 860 is disposed inside the mold main body 830 so as to be movable forward and backward. The movable portion 860 includes a 1 st movable portion 840 and a 2 nd movable portion 850.

The mold main body 830 is formed rotationally symmetrical (for example, 180 ° rotational symmetry) about the rotation center line 520X of the table 520. The mold main body 830 includes a movable attachment plate 831 attached to the table 520, a spacer 835 forming a space 834 in front of the movable attachment plate 831, a movable platen 836 fixed to the movable attachment plate 831 via the spacer 835, and a guide pin 839.

A through hole 832 penetrating the movable attachment plate 831 in the mold opening and closing direction is formed in the movable attachment plate 831. The through hole 832 has a diameter larger than the diameter of the 1 st stage pin 540 and the diameter of the 2 nd stage pin 550. The through-holes 832 are arranged rotationally symmetrically (for example, 180 ° rotationally symmetrically) about the rotation center line 520X of the table 520.

The spacer 835 forms a space 834 between the movable mounting plate 831 and the movable platen 836. In the space 834, a 1 st ejector plate 841 and a 2 nd ejector plate 851, which will be described later, are disposed to be movable forward and backward.

The movable die plate 836 has a 1 st movable molding surface 821 and a 2 nd movable molding surface 822 on a surface facing the fixed die 810. The 1 st movable molding surface 821 and the 2 nd movable molding surface 822 sequentially form a part of the wall surface of the 1 st molding part 801 and a part of the wall surface of the 2 nd molding part 805, respectively.

A plurality of (e.g., a pair of) the 1 st movable portions 840 are arranged in rotational symmetry (e.g., 180 ° rotational symmetry) about the rotation center line 520X of the table 520. Both the 1 st runner molded article 23 and the 2 nd runner molded article 27 can be pushed out by the 1 st movable portion 840. The 1 st movable part 840 includes, for example, a 1 st ejector plate 841 disposed perpendicularly to the mold opening and closing direction and a rod-shaped 1 st ejector pin 844 extending forward from the 1 st ejector plate 841.

The 1 st ejector plate 841 is disposed in a space 834 between the movable mounting plate 831 and the movable die plate 836. The 1 st ejector plate 841 advances and retreats along a guide pin 839 parallel to the mold opening and closing direction. The 1 st ejector plate 841 is urged in a direction away from the movable die plate 836 by the 1 st return spring 845.

The 1 st ejector pin 844 is disposed in a 1 st pin hole penetrating the movable die plate 836 in the die opening and closing direction so as to be able to advance and retreat. The tip surface of the 1 st knockout pin 844 abuts on the 1 st bead molded article 23 or the 2 nd bead molded article 27.

As with the 1 st movable unit 840, a plurality (e.g., a pair) of the 2 nd movable units 850 are arranged so as to be rotationally symmetric (e.g., 180 ° rotational symmetric) about the rotation center line 520X of the table 520. The 2 nd movable portion 850 includes, for example, a 2 nd ejector plate 851 disposed perpendicularly to the mold opening/closing direction and a rod-like 2 nd ejector pin 854 extending forward from the 2 nd ejector plate 851.

The 2 nd ejector plate 851 is disposed in a space 834 between the movable attachment plate 831 and the movable die plate 836. The 2 nd ejector plate 851 advances and retreats along a guide pin 839 parallel to the mold opening and closing direction. The 2 nd ejector plate 851 is urged in a direction away from the movable die plate 836 by a 2 nd return spring 855.

The 2 nd ejector plate 851 is disposed behind the 1 st ejector plate 841. When the 2 nd ejector plate 851 moves forward, the 1 st ejector plate 841 is pushed by the 2 nd ejector plate 851 and moves forward.

The 2 nd ejector plate 851 is formed with a through hole 856 penetrating the 2 nd ejector plate 851 in the mold opening and closing direction. The through hole 856 has a smaller diameter than the diameter of the 2 nd stage pin 550. The 2 nd table pin 550 does not pass through the through hole 856 of the 2 nd ejector plate 851, and pushes the 2 nd ejector plate 851 forward.

The through hole 856 of the 2 nd ejector plate 851 has a larger hole diameter than the 1 st stage pin 540. The 1 st table pin 540 passes through the through hole 856 of the 2 nd ejector plate 851 and pushes the 1 st ejector plate 841 forward.

The 2 nd ejector pin 854 is disposed in a 2 nd pin hole penetrating the movable die plate 836 in the die opening and closing direction so as to be able to advance and retreat. The tip surface of the 2 nd ejector pin 854 abuts against the 1 st cavity space molded article 22 or the 2 nd cavity space molded article 26.

Next, the operation of the 1 st knock-out lever 210 will be described mainly with reference to fig. 6 and 7. When the table 520 rotates, the 1 st knock-out lever 210 stands by at the rear of the table 520 so as not to interfere with the table 520. The 1 st knock-out lever 210 advances after the table 520 rotates, enters the inside of the table 520, and advances the 1 st table pin 540.

The 1 st knock-out lever 210 does not advance the 2 nd table pin 550 when advancing the 1 st table pin 540. The diameter of the through hole of the 2 nd table pin 550 is larger than the diameter of the 1 st knock-out lever 210. The 1 st knock-out lever 210 enters the inside of the 2 nd table pin 550, and advances the 1 st table pin 540.

The 1 st stage pin 540 passes through the through hole 832 of the movable mounting plate 831 and the through hole 856 of the 2 nd knock-out plate 851, and pushes the 1 st knock-out plate 841 forward. As a result, the 1 st ejector plate 841 moves forward against the biasing force of the 1 st return spring 845. Accordingly, the 1 st knockout pin 844 advances to push the 1 st runner molded article 23 out of the mold main body 830.

During the advance of the 1 st ejector plate 841, the 2 nd ejector plate 851 is pushed back to the retreat limit position by the urging force of the 2 nd return spring 855, and does not advance. Therefore, when the 1 st runner molding 23 is pushed out from the mold main body 830, the 1 st cavity space molding 22 is not pushed out from the mold main body 830.

Then, when the 1 st eject lever 210 retreats, the 1 st eject plate 841 retreats to the retreat limit position by the biasing force of the 1 st return spring 845. When the 1 st ejector plate 841 reaches the retreat limit position, the front end surface of the 1 st ejector pin 844 is flush with the front end surface of the mold main body 830.

While the 1 st ejector plate 841 is retreating, the 1 st table pin 540 is pushed by the 1 st ejector plate 841 and retreats. When the 1 st eject plate 841 reaches the retreat limit position, the 1 st table pin 540 stops retreating. In this case, the tip end portion of the 1 st stage pin 540 remains inside the movable mold 820.

The 1 st table pin 540 may be biased rearward by a spring, not shown, provided inside the table 520. The tip end portion of the 1 st stage pin 540 can be retracted backward from the movable die 820 by the biasing force of the spring. When the mold is replaced, the movable mold 820 can be prevented from interfering with the 1 st table pin 540, and the movable mold 820 or the 1 st table pin 540 can be prevented from being damaged.

As described above, when the table 520 rotates, the 1 st knock-out lever 210 stands by behind the table 520 so as not to interfere with the table 520. The 1 st knock-out lever 210 advances after the rotation of the table 520, and enters the inside of the table 520. The 1 st ejector rod 210 moves the 1 st movable portion 840 forward via the 1 st table pin 540, and pushes the 1 st runner molded product 23 out of the mold main body 830. The idle running distance of the 1 st knock-out lever 210 can be shortened by the length of the 1 st table pin 540. Thus, the molding cycle can be shortened.

The 1 st table pin 540 moves the 1 st movable portion 840 forward in a state where the 2 nd movable portion 850 is stopped. When the 1 st cavity space molded product 23 is pushed out, the 1 st cavity space molded product 22 can be prevented from being pushed out together with the 1 st runner molded product 23. The 1 st runner molded article 23 is offset from the 1 st cavity space molded article 22, and therefore the 1 st runner molded article 23 and the 1 st cavity space molded article 22 are separated at their boundary portions. In order to facilitate separation of the 1 st cavity space molded article 22 and the 1 st runner molded article 23, their boundary portions are formed to be thin.

Further, the 1 st runner molded article 23 and the 1 st cavity space molded article 22 may be separated before the 1 st runner molded article 23 is pushed out. For example, when the gate serving as the inlet of the 1 st cavity space 802 is a submarine gate, the 1 st runner molded article 23 and the 1 st cavity space molded article 22 are separated by opening the mold. When the 1 st runner molding 23 is pushed out, the 1 st cavity space molding 22 is not pulled by the 1 st runner molding 23, and therefore the 1 st cavity space molding 22 is not deformed. Thus, the quality of the 1 st cavity space molded article 22 can be suppressed from being degraded.

Next, the operation of the 2 nd ejector lever 220 will be described mainly with reference to fig. 6 and 7. When the table 520 rotates, the 2 nd ejector lever 220 stands by at the rear of the table 520 so as not to interfere with the table 520. The 2 nd knock-out lever 220 advances after the table 520 rotates, and enters the inside of the table 520 to advance the 2 nd table pin 550.

The 2 nd knock-out lever 220 does not enter the through-hole of the 2 nd table pin 550, but pushes the edge of the through-hole forward to advance the 2 nd table pin 550. The aperture of the through-hole of the 2 nd table pin 550 is smaller than the diameter of the 2 nd ejector rod 220.

The 2 nd table pin 550 passes through the through hole 832 of the movable mounting plate 831 and pushes an edge of the through hole 856 of the 2 nd ejector plate 851 forward. As a result, the 2 nd ejector plate 851 moves forward against the biasing force of the 2 nd return spring 855. Accordingly, the 2 nd ejector pin 854 advances, and pushes the 2 nd cavity space molded product 26 out of the mold main body 830.

While the 2 nd ejector plate 851 advances, the 1 st ejector plate 841 is pushed by the 2 nd ejector plate 851 and advances. The 1 st ejector plate 841 advances against the urging force of the 1 st return spring 845. As a result, the 1 st ejector pin 844 advances to push the 2 nd runner molded article 27 out of the mold main body 830.

Then, when the 2 nd ejector lever 220 retreats, the 2 nd ejector plate 851 is retreated to the retreat limit position by the urging force of the 2 nd return spring 855. When the 2 nd ejector plate 851 reaches the retreat limit position, the tip surfaces of the 2 nd ejector pins 854 are flush with the tip surface of the mold main body 830.

While the 2 nd ejector plate 851 is retreating, the 2 nd table pin 550 is pushed by the 2 nd ejector plate 851 and retreats. When the 2 nd ejector plate 851 reaches the retreat limit position, the 2 nd table pin 550 stops retreating. In this case, the tip end portion of the 2 nd stage pin 550 remains inside the movable mold 820.

The 2 nd table pin 550 may be biased rearward by a spring, not shown, provided inside the table 520. The tip end portion of the 2 nd stage pin 550 can be retracted rearward from the movable die 820 by the biasing force of the spring. When the mold is replaced, the movable mold 820 can be prevented from interfering with the 2 nd table pin 550, and the movable mold 820 or the 2 nd table pin 550 can be prevented from being damaged.

While the 2 nd ejector plate 851 is retreating, the 1 st ejector plate 841 is retreated to the retreat limit position by the urging force of the 1 st return spring 845. When the 1 st ejector plate 841 reaches the retreat limit position, the front end surface of the 1 st ejector pin 844 is flush with the front end surface of the mold main body 830.

As described above, when the table 520 rotates, the 2 nd ejector lever 220 stands by behind the table 520 so as not to interfere with the table 520. The 2 nd ejector rod 220 advances after the rotation of the table 520 and enters the inside of the table 520. The 2 nd ejector rod 220 moves the 2 nd movable portion 850 forward via the 2 nd table pin 550, and pushes the 2 nd cavity space molded product 26 out of the mold main body 830. The idle running distance of the 2 nd knock-out lever 220 can be shortened by the length of the 2 nd table pin 550. Thus, the molding cycle can be shortened.

The 2 nd table pin 550 advances the 1 st movable part 840 together with the 2 nd movable part 850. When the 2 nd cavity space molded product 26 is pushed out, the 2 nd runner molded product 27 is pushed out together with the 2 nd cavity space molded product 26. The 2 nd cavity space molded product 26 can be prevented from being deviated from the 2 nd runner molded product 27. Since the 2 nd runner molding 27 does not pull the 2 nd cavity space molding 26, the 2 nd cavity space molding 26 is not deformed. The quality of the 2 nd cavity space molded product 26 can be suppressed from being deteriorated. The 2 nd runner molded product 27 is pushed out together with the 2 nd cavity space molded product 26, and then separated from the 2 nd cavity space molded product 26.

The 2 nd runner molded product 27 and the 1 st runner molded product 23 are pushed out by the same movable portion (specifically, the 1 st movable portion 840) disposed inside the mold main body 830 so as to be able to advance and retreat. The number of components constituting the movable mold 820 can be reduced, and the structure of the movable mold 820 can be simplified.

The 2 nd table pin 550 may advance the 2 nd movable portion 850, and the 2 nd movable portion 850 may be advanced in a state where the 1 st movable portion 840 is stopped. That is, the 2 nd runner molded product 27 can be pushed out together with the 2 nd cavity space molded product 26. In this case, the 2 nd cavity space molded product 26 and the 2 nd runner molded product 27 may be separated before the 2 nd cavity space molded product 26 is pushed out.

For example, when the gate that is the entrance of the 2 nd cavity space 806 is a submarine gate, the 2 nd cavity space molded product 26 and the 2 nd runner molded product 27 are separated by opening the mold. When the 2 nd cavity space molded product 26 is pushed out, the 2 nd cavity space molded product 26 is not pulled by the 2 nd runner molded product 27, and therefore the 2 nd cavity space molded product 26 is not deformed. Thus, the quality of the 2 nd cavity space molded product 26 can be suppressed from being degraded.

As described above, the ejector 200 advances and retreats the movable portion 860, which is disposed inside the mold main body 830 and from which the molded product is ejected, by the table pin 560. Accordingly, the idle running distance of the ejector rod can be shortened by the length of the table pin 560, and the molding cycle can be shortened. The position of the movable section 860 in the 1 st molding section 801 is different from the position of the movable section 860 in the 2 nd molding section 805. The push-out position of the movable section 860 is a position at which the molded article is pushed out from the mold main body section 830 of the movable section 860. In the 1 st molding section 801 and the 2 nd molding section 805, the push-out position of the movable section 860 can be changed. Accordingly, in the 1 st molding section 801 and the 2 nd molding section 805, different objects can be pushed out from the mold main body 830.

The movable portion 860 includes a 1 st movable portion 840 and a 2 nd movable portion 850. The ejector 200 presses the 1 st movable portion 840 against the 1 st molding portion 801 and presses the 2 nd movable portion 850 against the 2 nd molding portion 805. The position where the molded product is pushed out from the mold main body portion 830 of the 1 st movable portion 840 is different from the position where the molded product is pushed out from the mold main body portion 830 of the 2 nd movable portion 850. In the 1 st molding section 801 and the 2 nd molding section 805, the push-out position of the movable section 860 can be changed. Accordingly, in the 1 st molding section 801 and the 2 nd molding section 805, different objects can be pushed out from the mold main body 830.

The table pin 560 includes a 1 st table pin 540 that presses the 1 st movable portion 840 and a 2 nd table pin 550 that presses the 2 nd movable portion 850. The 1 st table pin 540 advances the 1 st movable portion 840 to thereby push the 1 st runner molded product 23 out of the mold main body 830 in the 1 st molding portion 801. The 2 nd table pin 550 moves the 2 nd movable part 850 forward, thereby pushing the 2 nd cavity space molded product 26 out of the mold main body 830 in the 2 nd molding part 805.

The 1 st table pin 540 moves the 1 st movable portion 840 forward in a state where the 2 nd movable portion 850 is stopped. The 2 nd table pin 550 moves forward the 2 nd movable part 850, which does not move forward and backward by the 1 st table pin 540. In the 1 st molding section 801 and the 2 nd molding section 805, the push-out position of the movable section 860 can be changed. Accordingly, in the 1 st molding section 801 and the 2 nd molding section 805, different objects can be pushed out from the mold main body 830.

For example, the molded product pushed out in the 1 st molding part 801 is the 1 st runner molded product 23, not the 1 st cavity space molded product 22. On the other hand, the molded product pushed out by the 2 nd molding section 805 is the 2 nd cavity space molded product 26 including the 1 st cavity space molded product 22 as a part.

The molded product pushed out by the 1 st molding section 801 is not limited to the 1 st runner molded product 23. For example, the molded product pushed out in the 1 st molding part 801 may be a finished product completed in the 1 st molding part 801, for example, a finished product completed by 1 molding. This product may be used in combination with the 2 nd cavity space molded product 26, or may be unrelated to the 2 nd cavity space molded product 26.

Accordingly, the 1 st communicating space 803 of the 1 st molding part 801 is not limited to a flow channel. The 1 st communication space 803 may include a cavity space. In this cavity space, a finished product completed in the 1 st molding portion 801, for example, a finished product completed by 1 molding is molded. The product cavity space and the 1 st cavity space 802 are formed at the branched end portions of the flow paths, respectively.

The table pin 560 may include a 3 rd table pin in addition to the 1 st table pin 540 and the 2 nd table pin 550. The 3 rd stage pin presses a 3 rd movable portion different from the 1 st movable portion 840 and the 2 nd movable portion 850, thereby pushing out the molded article from the mold main body 830 in a 3 rd molding portion different from the 1 st molding portion 801 and the 2 nd molding portion 805. The 3 rd table pin is disposed rotationally symmetrically (for example, 120 ° rotationally symmetrically) about the rotation center line 520X of the table 520.

The 3 rd stage pin is disposed coaxially with the 1 st stage pin 540 and the 2 nd stage pin 550, for example. For example, the 3 rd stage pin is disposed inside the 1 st stage pin 540 coaxially with the 1 st stage pin 540 and the 2 nd stage pin 550. In this case, the 1 st stage pin 540 is formed in a cylindrical shape like the 2 nd stage pin 550.

The 3 rd table pin may be disposed coaxially with the 1 st table pin 540 and the 2 nd table pin 550 outside the 2 nd table pin 550. In this case, the 3 rd stage pin is formed in a cylindrical shape like the 2 nd stage pin 550, and the 2 nd stage pin 550 is disposed inside the cylindrical 3 rd stage pin.

The 3 rd stage pin pushes out the molded article solidified together with the 1 st-time molded article without pushing out the 1 st-time molded article molded in the 3 rd cavity space of the 3 rd molding part, for example. The 1 st stage pin 540 does not push out the 2 st molded product as the 1 st cavity space molded product 22, but pushes out a molded product solidified together with the 2 st molded product. The 2 nd stage pin 550 pushes out the 3 nd-order molded product as the 2 nd cavity space molded product 26.

In addition, the 3 rd stage pin can push out the 3 rd-order molded product molded in the 3 rd cavity space of the 3 rd molding part. In this case, the 1 st stage pin 540 pushes out the molded article solidified together with the 1 st-order molded article without pushing out the 1 st-order molded article as the 1 st cavity space molded article 22. The 2 nd stage pin 550 pushes out the molded article solidified together with the 2 nd cavity space molded article 26 without pushing out the 2 nd molded article. Then, the 3 rd stage pin pushes out the 3 rd stage molded product.

When the 3 rd stage pin pushes out the 3 rd molded product via the 3 rd movable part, the 2 nd stage pin 550 advances and retreats the 2 nd movable part 850 in a state where the 3 rd movable part is stopped. The 2 nd movable portion 850 pushes out the molded article cured together with the 2 nd molded article without pushing out the 2 nd molded article. The 2-shot molded product is not pushed out from the mold body 830, and is rotated by 120 ° together with the mold body 830. Then, the mold is closed, and the 2-time molded product is disposed in a part of the 3 rd cavity space.

Further, a 4 th table pin may be disposed inside the table 520 in addition to the 1 st table pin 540, the 2 nd table pin 550, and the 3 rd table pin. The number of table pins is not particularly limited.

(modification 1)

Fig. 8 is a diagram showing a state of the mold apparatus when the rotation angle of the table according to modification 1 is 180 ° and the mold is closed. Fig. 9 is a cross-sectional view showing a state of the mold apparatus when the rotation angle of the table according to modification 1 is 180 ° and the mold opening is completed. Fig. 10 is an enlarged view of a part of fig. 9. Hereinafter, differences between this modification and the above embodiment will be mainly described.

The injection molding machine 10 has a 1 st table pin 540. The 1 st stage pin 540 is disposed inside the stage 520 so as to be movable forward and backward in the mold opening and closing direction. Specifically, the 1 st stage pin 540 is disposed in the 1 st stage through hole 524A so as to be movable forward and backward in the mold opening and closing direction.

The 1 st table penetration hole 524A penetrates the table 520 (specifically, for example, the die attaching portion 521 and the disc portion 522) in the die opening and closing direction. The 1 st table through-hole 524A is arranged in plural numbers so as to be rotationally symmetrical (for example, 180 ° rotational symmetry) about the rotation center line 520X of the table 520. The 1 st table pin 540 is disposed in each of the 1 st table through-holes 524A.

The 1 st table pin 540 rotates together with the table 520. The 1 st stage pin 540 is arranged in plural numbers so as to be rotationally symmetrical (for example, 180 ° rotational symmetry) about the rotation center line 520X of the stage 520.

Also, the injection molding machine 10 has the 2 nd table pin 550. The 2 nd table pin 550 is disposed inside the table 520 so as to be movable forward and backward in the mold opening and closing direction. Specifically, the 2 nd table pin 550 is disposed in the 2 nd table through-hole 524B so as to be movable forward and backward in the mold opening and closing direction.

The 2 nd table penetration hole 524B penetrates the table 520 (specifically, for example, the die attaching portion 521 and the disc portion 522) in the die opening and closing direction. A plurality of 2 nd table through holes 524B are arranged in rotational symmetry (for example, 180 ° rotational symmetry) around the rotation center line 520X of the table 520. The 2 nd table pin 550 is disposed in each of the plurality of 2 nd table through-holes 524B.

The 2 nd table pin 550 rotates together with the table 520. The 2 nd table pin 550 is disposed in plural numbers so as to be rotationally symmetrical (for example, 180 ° rotational symmetry) about the rotation center line 520X of the table 520.

The 1 st stage pin 540 and the 2 nd stage pin 550 are disposed at an interval in a direction perpendicular to the mold opening and closing direction and are capable of moving forward and backward relative to each other. Since the 1 st stage pin 540 is disposed outside the 2 nd stage pin 550, the structure of the 2 nd stage pin 550 can be simplified, and the manufacturing cost of the 2 nd stage pin 550 can be reduced. Further, since the 1 st stage pin 540 is positioned outside the 2 nd stage pin 550, the structure of the 2 nd stage pin 550 can be the same as that of the 1 st stage pin 540. Thus, the modules can be generalized and the cost can be reduced.

As shown in fig. 10, the 1 st table pin 540 coaxially includes a 1 st large diameter shaft portion 541 and a 1 st small diameter shaft portion 542 having a smaller diameter than the 1 st large diameter shaft portion 541. The 1 st small-diameter shaft portion 542 is disposed rearward (on the X-axis direction negative side) of the 1 st large-diameter shaft portion 541. A 1 st bush 543 having an outer diameter larger than that of the 1 st large diameter shaft portion 541 is fixed to the 1 st small diameter shaft portion 542. The outer peripheral surface of the 1 st bushing 543 slidably contacts the hole wall surface of the 1 st table through-hole 524A (more specifically, the 1 st large-diameter hole 525A described later).

The 1 st table through-hole 524A coaxially includes a 1 st large-diameter hole portion 525A and a 1 st small-diameter hole portion 526A having a smaller diameter than the 1 st large-diameter hole portion 525A. The 1 st small-diameter hole 526A is disposed rearward (on the X-axis direction negative side) of the 1 st large-diameter hole 525A. A bush 529A is fixed to a hole wall surface of the 1 st large-diameter hole portion 525A by a bush fixing tool 528A or the like. The inner circumferential surface of the bushing 529A is in sliding contact with the outer circumferential surface of the 1 st table pin 540 (more specifically, the 1 st large-diameter shaft portion 541). The bushing 529A functions as a stopper. The bushing 529A abuts against the front end surface of the 1 st bushing 543, thereby preventing the 1 st table pin 540 from coming out of the table 520 in the forward direction.

In the 1 st small-diameter hole 526A, the 1 st small-diameter shaft portion 542 is disposed to be movable forward and backward. The aperture of the 1 st small-diameter hole portion 526A is smaller than the aperture of the 1 st large-diameter hole portion 525A. A step surface 527A is formed between the hole wall surface of the 1 st small-diameter hole portion 526A and the hole wall surface of the 1 st large-diameter hole portion 525A. The step surface 527A functions as a stopper. The stepped surface 527A abuts against the rear end surface of the 1 st bushing 543, thereby preventing the 1 st table pin 540 from coming out of the table 520 in the rear direction.

The 2 nd table pin 550 coaxially has a 2 nd large diameter shaft portion 551 and a 2 nd small diameter shaft portion 552 having a smaller diameter than the 2 nd large diameter shaft portion 551. The 2 nd small diameter shaft portion 552 is disposed rearward (on the X axis direction negative side) of the 2 nd large diameter shaft portion 551. A2 nd bush 553 having an outer diameter larger than that of the 2 nd large diameter shaft 551 is fixed to the 2 nd small diameter shaft 552. The outer peripheral surface of the 2 nd bushing 553 slidably contacts the hole wall surface of the 2 nd table penetration hole 524B (more specifically, the 2 nd large-diameter hole 525B described later).

The 2 nd table penetration hole 524B coaxially includes a 2 nd large diameter hole 525B and a 2 nd small diameter hole 526B having a smaller diameter than the 2 nd large diameter hole 525B. The 2 nd small diameter hole 526B is disposed rearward (on the X-axis direction negative side) of the 2 nd large diameter hole 525B. A bush 529B is fixed to a hole wall surface of the 2 nd large-diameter hole portion 525B by a bush fixing tool 528B or the like. The inner circumferential surface of the bushing 529B is in sliding contact with the outer circumferential surface of the 2 nd table pin 550 (more specifically, the 2 nd large-diameter shaft 551). The bushing 529B functions as a stopper. The bushing 529B abuts against the front end surface of the 2 nd bushing 553, thereby preventing the 2 nd table pin 550 from coming out of the table 520 in the forward direction.

In the 2 nd small diameter hole 526B, the 2 nd small diameter shaft 552 is disposed to be movable forward and backward. The aperture of the 2 nd small-diameter hole portion 526B is smaller than the aperture of the 2 nd large-diameter hole portion 525B. A step surface 527B is formed between the hole wall surface of the 2 nd small-diameter hole portion 526B and the hole wall surface of the 2 nd large-diameter hole portion 525B. The step surface 527B has the function of a stopper. The step surface 527B abuts against the rear end surface of the 2 nd bush 553, thereby preventing the 2 nd table pin 550 from coming out of the table 520 in the rear direction.

Next, the structure of the movable mold 820 will be described. The movable mold 820 includes a mold main body 830 attached to the table 520 and a movable portion 860 disposed inside the mold main body 830 and used for pushing out a molded product. The movable section 860 is disposed inside the mold main body 830 so as to be movable forward and backward. The movable portion 860 includes a 1 st movable portion 840 and a 2 nd movable portion 850.

The 1 st movable part 840 includes, for example, a 1 st ejector plate 841 disposed perpendicularly to the mold opening and closing direction and a rod-shaped 1 st ejector pin 844 extending forward from the 1 st ejector plate 841. The 1 st ejector plate 841 is disposed in a space 834 between the movable mounting plate 831 and the movable die plate 836.

The 2 nd movable portion 850 includes, for example, a 2 nd ejector plate 851 disposed perpendicularly to the mold opening/closing direction and a rod-like 2 nd ejector pin 854 extending forward from the 2 nd ejector plate 851. The 2 nd ejector plate 851 is disposed in a space 834 between the movable attachment plate 831 and the movable die plate 836. The 2 nd ejector plate 851 and the 1 st ejector plate 841 are arranged in a direction perpendicular to the mold opening and closing direction.

The 1 st movable portion 840 of this modification includes a member 842 that extends from the 1 st ejector plate 841 to the front of the 2 nd ejector plate 851. When the 2 nd ejector plate 851 is advanced, the 1 st ejector plate 841 can be advanced by the 2 nd ejector plate 851 pressing member 842.

Next, the operation of the 1 st knock-out lever 210 will be described. When the table 520 rotates, the 1 st knock-out lever 210 stands by at the rear of the table 520 so as not to interfere with the table 520. The 1 st knock-out lever 210 advances after the table 520 rotates, enters the inside of the table 520, and advances the 1 st table pin 540.

The 1 st knock-out lever 210 does not advance the 2 nd table pin 550 when advancing the 1 st table pin 540. Since the 1 st stage pin 540 and the 2 nd stage pin 550 are disposed at an interval in a direction perpendicular to the mold opening and closing direction, the 2 nd stage pin 550 is not pressed by the 1 st knock-out lever 210.

The 1 st stage pin 540 passes through the 1 st through hole 832A of the movable mounting plate 831 and pushes the 1 st eject plate 841 forward. As a result, the 1 st ejector plate 841 moves forward against the biasing force of the 1 st return spring 845. Accordingly, the 1 st knockout pin 844 advances to push the 1 st runner molded article 23 out of the mold main body 830.

During the advance of the 1 st ejector plate 841, the 2 nd ejector plate 851 is pushed back to the retreat limit position by the urging force of the 2 nd return spring 855, and does not advance. Therefore, when the 1 st runner molding 23 is pushed out from the mold main body 830, the 1 st cavity space molding 22 is not pushed out from the mold main body 830.

Then, when the 1 st eject lever 210 retreats, the 1 st eject plate 841 retreats to the retreat limit position by the biasing force of the 1 st return spring 845. When the 1 st ejector plate 841 reaches the retreat limit position, the front end surface of the 1 st ejector pin 844 is flush with the front end surface of the mold main body 830.

While the 1 st ejector plate 841 is retreating, the 1 st table pin 540 is pushed by the 1 st ejector plate 841 and retreats. When the 1 st eject plate 841 reaches the retreat limit position, the 1 st table pin 540 stops retreating. In this case, the tip end portion of the 1 st stage pin 540 remains inside the movable mold 820.

The 1 st table pin 540 may be biased rearward by a spring, not shown, provided inside the table 520. The tip end portion of the 1 st stage pin 540 can be retracted backward from the movable die 820 by the biasing force of the spring. When the mold is replaced, the movable mold 820 can be prevented from interfering with the 1 st table pin 540, and the movable mold 820 or the 1 st table pin 540 can be prevented from being damaged.

Next, the operation of the 2 nd ejector lever 220 will be described. When the table 520 rotates, the 2 nd ejector lever 220 stands by at the rear of the table 520 so as not to interfere with the table 520. The 2 nd knock-out lever 220 advances after the table 520 rotates, and enters the inside of the table 520 to advance the 2 nd table pin 550.

When the 2 nd knock-out lever 220 advances the 2 nd table pin 550, the 1 st table pin 540 is not advanced. Since the 1 st stage pin 540 and the 2 nd stage pin 550 are disposed at an interval in a direction perpendicular to the mold opening and closing direction, the 1 st stage pin 540 is not pressed by the 2 nd ejector rod 220.

The 2 nd table pin 550 passes through the 2 nd through hole 832B of the movable mounting plate 831 and pushes the 2 nd ejector plate 851 forward. As a result, the 2 nd ejector plate 851 moves forward against the biasing force of the 2 nd return spring 855. Accordingly, the 2 nd ejector pin 854 advances, and pushes the 2 nd cavity space molded product 26 out of the mold main body 830.

While the 2 nd ejector plate 851 advances, the 1 st ejector plate 841 is pushed by the 2 nd ejector plate 851 and advances. The 1 st ejector plate 841 advances against the urging force of the 1 st return spring 845. As a result, the 1 st ejector pin 844 advances to push the 2 nd runner molded article 27 out of the mold main body 830.

Then, when the 2 nd ejector lever 220 retreats, the 2 nd ejector plate 851 is retreated to the retreat limit position by the urging force of the 2 nd return spring 855. When the 2 nd ejector plate 851 reaches the retreat limit position, the tip surfaces of the 2 nd ejector pins 854 are flush with the tip surface of the mold main body 830.

While the 2 nd ejector plate 851 is retreating, the 1 st ejector plate 841 is retreated to the retreat limit position by the urging force of the 1 st return spring 845. When the 1 st ejector plate 841 reaches the retreat limit position, the front end surface of the 1 st ejector pin 844 is flush with the front end surface of the mold main body 830.

While the 2 nd ejector plate 851 is retreating, the 2 nd table pin 550 is pushed by the 2 nd ejector plate 851 and retreats. When the 2 nd ejector plate 851 reaches the retreat limit position, the 2 nd table pin 550 stops retreating. In this case, the tip end portion of the 2 nd stage pin 550 remains inside the movable mold 820.

The 2 nd table pin 550 may be biased rearward by a spring, not shown, provided inside the table 520. The tip end portion of the 2 nd stage pin 550 can be retracted rearward from the movable die 820 by the biasing force of the spring. When the mold is replaced, the movable mold 820 can be prevented from interfering with the 2 nd table pin 550, and the movable mold 820 or the 2 nd table pin 550 can be prevented from being damaged.

In this modification, when the 2 nd ejector plate 851 is advanced, the member 842 is pressed by the 2 nd ejector plate 851 so that the 1 st ejector plate 841 is advanced, but the present invention is not limited to this. If the member 842 is not provided, the 1 st ejector plate 841 is pushed back by the biasing force of the 1 st return spring 845 to be stopped at the retreat limit position and does not advance while the 2 nd ejector plate 851 advances. When the 2 nd cavity space molded product 26 is pushed out from the mold main body 830, the 2 nd runner molded product 27 is not pushed out from the mold main body 830.

As described above, in this modification as well, the ejector 200 advances and retracts the movable section 860, which is disposed inside the mold main body section 830 and from which the molded product is ejected, by the table pin 560, in the same manner as in the above-described embodiment. Accordingly, the idle running distance of the ejector rod can be shortened by the length of the table pin 560, and the molding cycle can be shortened. The position of the movable section 860 in the 1 st molding section 801 is different from the position of the movable section 860 in the 2 nd molding section 805. The push-out position of the movable section 860 is a position at which the molded article is pushed out from the mold main body section 830 of the movable section 860. In the 1 st molding section 801 and the 2 nd molding section 805, the push-out position of the movable section 860 can be changed. Accordingly, in the 1 st molding section 801 and the 2 nd molding section 805, different objects can be pushed out from the mold main body 830.

In this modification as well, the movable section 860 includes the 1 st movable section 840 and the 2 nd movable section 850, as in the above-described embodiment. The ejector 200 presses the 1 st movable portion 840 against the 1 st molding portion 801 and presses the 2 nd movable portion 850 against the 2 nd molding portion 805. The position where the molded product is pushed out from the mold main body portion 830 of the 1 st movable portion 840 is different from the position where the molded product is pushed out from the mold main body portion 830 of the 2 nd movable portion 850. In the 1 st molding section 801 and the 2 nd molding section 805, the push-out position of the movable section 860 can be changed. Accordingly, in the 1 st molding section 801 and the 2 nd molding section 805, different objects can be pushed out from the mold main body 830.

In this modification, the table pin 560 includes the 1 st table pin 540 that presses the 1 st movable portion 840 and the 2 nd table pin 550 that presses the 2 nd movable portion 850, as in the above embodiment. The 1 st table pin 540 advances the 1 st movable portion 840 to thereby push the 1 st runner molded product 23 out of the mold main body 830 in the 1 st molding portion 801. The 2 nd table pin 550 moves the 2 nd movable part 850 forward, thereby pushing the 2 nd cavity space molded product 26 out of the mold main body 830 in the 2 nd molding part 805.

In this modification, as in the above-described embodiment, the 1 st table pin 540 moves the 1 st movable portion 840 forward while stopping the 2 nd movable portion 850. The 2 nd table pin 550 moves forward the 2 nd movable part 850, which does not move forward and backward by the 1 st table pin 540. In the 1 st molding section 801 and the 2 nd molding section 805, the push-out position of the movable section 860 can be changed. Accordingly, in the 1 st molding section 801 and the 2 nd molding section 805, different objects can be pushed out from the mold main body 830.

For example, the molded product pushed out in the 1 st molding part 801 is the 1 st runner molded product 23, not the 1 st cavity space molded product 22. On the other hand, the molded product pushed out by the 2 nd molding section 805 is the 2 nd cavity space molded product 26 including the 1 st cavity space molded product 22 as a part.

The molded product pushed out by the 1 st molding section 801 is not limited to the 1 st runner molded product 23. For example, the molded product pushed out in the 1 st molding part 801 may be a finished product completed in the 1 st molding part 801, for example, a finished product completed by 1 molding. This product may be used in combination with the 2 nd cavity space molded product 26, or may be unrelated to the 2 nd cavity space molded product 26.

Accordingly, the 1 st communicating space 803 of the 1 st molding part 801 is not limited to a flow channel. The 1 st communication space 803 may include a cavity space. In this cavity space, a finished product completed in the 1 st molding portion 801, for example, a finished product completed by 1 molding is molded. The product cavity space and the 1 st cavity space 802 are formed at the branched end portions of the flow paths, respectively.

In this modification, the table pin 560 may include a 3 rd table pin in addition to the 1 st table pin 540 and the 2 nd table pin 550. The 3 rd stage pin is disposed at a distance from the 1 st stage pin 540 and the 2 nd stage pin 550 in a direction perpendicular to the mold opening and closing direction, for example.

(modification 2)

Fig. 11 is a diagram showing a state of the mold apparatus when the rotation angle of the table according to modification 2 is 180 ° and the mold is closed. Fig. 12 is a cross-sectional view showing a state of the mold apparatus when the rotation angle of the table according to modification 2 is 180 ° and the mold opening is completed. Fig. 13 is an enlarged view of a part of fig. 12. Hereinafter, differences between this modification and the above-described modification 1 will be mainly described.

The injection molding machine 10 has a table pin 560. The table pin 560 of this modification has functions of both the 1 st table pin 540 and the 2 nd table pin 550 of the 1 st modification described above. The table pin 560 is disposed inside the table 520 so that the position thereof with respect to the movable portion 860 can be changed. The table pin 560 changes its position with respect to the movable portion 860 in a direction orthogonal to the mold opening and closing direction.

The injection molding machine 10 has a displacement mechanism 570 that changes the position of the table pin 560 with respect to the movable portion 860. A plurality of displacement mechanisms 570 corresponding to the plurality of table pins 560 are provided. The position of the table pin 560 with respect to the movable portion 860 can be changed for each table pin 560.

The displacement mechanism 570 changes the position of the table pin 560 with respect to the movable portion 860 between a position where the 1 st movable portion 840 is advanced and retracted with the 2 nd movable portion 850 stopped and a position where the 2 nd movable portion 850 is advanced and retracted. The displacement mechanism 570 has, for example, a holder 580 and a holder displacement mechanism 590.

The holder 580 holds the table pin 560 to be movable forward and backward in the die opening and closing direction. A holder through-hole 581 that penetrates the holder 580 in the die opening and closing direction is formed in the holder 580. The table pin 560 is disposed in the holder through hole 581 so as to be movable forward and backward.

As shown in fig. 13, the table pin 560 coaxially has a large diameter shaft portion 561 and a small diameter shaft portion 562 having a smaller diameter than the large diameter shaft portion 561. The small-diameter shaft portion 562 is disposed behind (on the X-axis direction negative side) the large-diameter shaft portion 561. A 1 st bushing 563 having an outer diameter larger than that of the large diameter shaft portion 561 is fixed to the small diameter shaft portion 562. The outer peripheral surface of the 1 st bush 563 is in sliding contact with a hole wall surface of the holder through-hole 581 (more specifically, a large-diameter hole portion 582 described later).

The holder through-hole 581 has a large-diameter hole portion 582 and a small-diameter hole portion 583 having a smaller diameter than the large-diameter hole portion 582 on the same axis. The small diameter hole 583 is disposed behind the large diameter hole 582 (on the negative side in the X-axis direction). The 2 nd bush 586 is fixed to the hole wall surface of the large-diameter hole portion 582 by a bush fixing tool 585 or the like. The inner circumferential surface of the 2 nd bush 586 is in sliding contact with the outer circumferential surface of the table pin 560 (more specifically, the large diameter shaft portion 561). Bushing 2 586 acts as a stop. The 2 nd bush 586 abuts on the front end surface of the 1 st bush 563, thereby preventing the table pin 560 from coming out of the holder 580 and further preventing the table pin 560 from coming out of the table 520 in the forward direction.

In the small diameter hole 583, the small diameter shaft 562 is disposed to be movable forward and backward. The small-diameter hole 583 has a smaller diameter than the large-diameter hole 582. A stepped surface 584 is formed between the hole wall surface of the small diameter hole portion 583 and the hole wall surface of the large diameter hole portion 582. The step surface 584 functions as a stopper. The step surface 584 abuts against the rear end surface of the 1 st bush 563, thereby preventing the table pin 560 from coming out of the holder 580 and further preventing the table pin 560 from coming out of the table 520.

The holder moving mechanism 590 moves the holder 580 relative to the table 520. The moving direction is, for example, a direction orthogonal to the mold opening and closing direction. The holder moving mechanism 590 is constituted by a fluid pressure cylinder such as a hydraulic cylinder or a pneumatic cylinder, for example. A rotary motor and a motion converting mechanism that converts the rotary motion of the rotary motor into the linear motion of the holder 580 may be used instead of the fluid pressure cylinder.

The displacement mechanism 570 of the present embodiment includes the holder 580 and the holder displacement mechanism 590, but the structure of the displacement mechanism 570 is not particularly limited. For example, the displacement mechanism 570 may have a holder turning mechanism described later, instead of the holder moving mechanism 590.

The holder swing mechanism swings the holder 580 with respect to the table 520. The center line of rotation of the holder 580 is offset from the center line of rotation 520X of the table 520 and parallel to the center line of rotation 520X of the table 520.

The holder rotation mechanism rotates, for example, 1 holder 580 about 1 rotation center line. The holder rotating mechanism may rotate the plurality of holders 580 about 1 rotation center line.

The configuration of the movable mold 820 and the configuration of the ejector 200 are the same as those of modification 1, and therefore, the description thereof is omitted.

The 1 st knock-out lever 210 advances after the rotation of the table 520, and enters the inside of the table 520. The 1 st ejector rod 210 moves the 1 st movable portion 840 forward via the table pin 560, thereby pushing the 1 st runner molded product 23 out of the mold main body 830. The idle running distance of the 1 st knock-out lever 210 can be shortened by the length of the table pin 560. Thus, the molding cycle can be shortened. The 1 st ejector rod 210 retreats after the 1 st runner molded product 23 is pushed out from the mold main body 830, and retreats to the rear of the table 520.

The 2 nd ejector rod 220 advances after the rotation of the table 520 and enters the inside of the table 520. The 2 nd ejector rod 220 pushes the 2 nd movable part 850 forward via the table pin 560, thereby pushing the 2 nd cavity space molded product 26 out of the mold main body 830. The idle running distance of the 2 nd knock-out lever 220 can be shortened by the length of the table pin 560. Thus, the molding cycle can be shortened. The 2 nd ejector rod 220 retreats after the 2 nd cavity space molded product 26 is pushed out from the mold main body 830, and retreats to the rear of the table 520.

As described above, in this modification as well, the ejector 200 advances and retracts the movable section 860, which is disposed inside the mold main body section 830 and from which the molded product is ejected, by the table pin 560, in the same manner as in the above-described embodiment. Accordingly, the idle running distance of the ejector rod can be shortened by the length of the table pin 560, and the molding cycle can be shortened. The position of the movable section 860 in the 1 st molding section 801 is different from the position of the movable section 860 in the 2 nd molding section 805. The push-out position of the movable section 860 is a position at which the molded article is pushed out from the mold main body section 830 of the movable section 860. In the 1 st molding section 801 and the 2 nd molding section 805, the push-out position of the movable section 860 can be changed. Accordingly, in the 1 st molding section 801 and the 2 nd molding section 805, different objects can be pushed out from the mold main body 830.

In this modification as well, the movable section 860 includes the 1 st movable section 840 and the 2 nd movable section 850, as in the above-described embodiment. The ejector 200 presses the 1 st movable portion 840 against the 1 st molding portion 801 and presses the 2 nd movable portion 850 against the 2 nd molding portion 805. The 1 st movable portion 840 is at a different ejection position from the 2 nd movable portion 850. In the 1 st molding section 801 and the 2 nd molding section 805, the push-out position of the movable section 860 can be changed. Accordingly, in the 1 st molding section 801 and the 2 nd molding section 805, different objects can be pushed out from the mold main body 830.

The table pin 560 is disposed inside the table 520 so that the position thereof with respect to the movable portion 860 can be changed. The table pin 560 is disposed in the table 520 so as to be movable between a 1 st position where it presses the 1 st movable portion 840 and a 2 nd position where it presses the 2 nd movable portion 850. The table pin 560 moves the 1 st movable portion 840 forward, thereby pushing the 1 st runner molded product 23 out of the mold main body portion 830 in the 1 st molding portion 801. Then, the 2 nd movable portion 850 is advanced by the table pin 560, and the 2 nd cavity space molded product 26 is pushed out from the mold main body portion 830 in the 2 nd molding portion 805.

The table pin 560 moves the 1 st movable portion 840 forward in a state where the 2 nd movable portion 850 is stopped. Then, the table pin 560 moves the 2 nd movable portion 850 forward. In the 1 st molding section 801 and the 2 nd molding section 805, the push-out position of the movable section 860 can be changed. Accordingly, in the 1 st molding section 801 and the 2 nd molding section 805, different objects can be pushed out from the mold main body 830.

For example, the molded product pushed out in the 1 st molding part 801 is the 1 st runner molded product 23, not the 1 st cavity space molded product 22. On the other hand, the molded product pushed out by the 2 nd molding section 805 is the 2 nd cavity space molded product 26 including the 1 st cavity space molded product 22 as a part.

The molded product pushed out by the 1 st molding section 801 is not limited to the 1 st runner molded product 23. For example, the molded product pushed out in the 1 st molding part 801 may be a finished product completed in the 1 st molding part 801, for example, a finished product completed by 1 molding. This product may be used in combination with the 2 nd cavity space molded product 26, or may be unrelated to the 2 nd cavity space molded product 26.

Accordingly, the 1 st communicating space 803 of the 1 st molding part 801 is not limited to a flow channel. The 1 st communication space 803 may include a cavity space. In this cavity space, a finished product completed in the 1 st molding portion 801, for example, a finished product completed by 1 molding is molded. The product cavity space and the 1 st cavity space 802 are formed at the branched end portions of the flow paths, respectively.

The table pin 560 of this modification has functions of both the 1 st table pin 540 and the 2 nd table pin 550 of the 1 st modification, and may have a function of the 3 rd table pin. In this case, the displacement mechanism 570 changes the relative position of the table pin with respect to the table 520 as viewed from the mold opening and closing direction between the following 3 positions. The 1 st position is a position where the 1 st movable portion 840 advances and retreats in a state where the 2 nd movable portion 850 and the 3 rd movable portion are stopped. The other 1 position is a position where the 2 nd movable part 850 is advanced and retreated in a state where the 3 rd movable part is stopped. The remaining 1 position is a position for advancing and retreating the 3 rd movable part.

In addition, although the table pin 560 is displaced in order to change the relative position of the table pin 560 and the movable portion 860 in this modification, the movable portion 860 may be displaced, or both the table pin 560 and the movable portion 860 may be displaced. That is, the movable portion 860 may be disposed inside the mold main body 830 so that the position thereof with respect to the table pin 560 can be freely changed. For example, the movable portion 860 may have an ejector plate that is movable between a position for pressing the 1 st ejector pin 844 and a position for pressing the 2 nd ejector pin 854.

(other modifications, etc.)

Although the embodiment of the injection molding machine and the like have been described above, the present invention is not limited to the above embodiment and the like. Various changes, modifications, substitutions, additions, deletions, and combinations may be made within the scope of the claims. Of course, these also fall within the technical scope of the present invention.

For example, the mold clamping device 100 according to the above embodiment, the above modification 1, and the above modification 2 is a horizontal type mold clamping device in which the mold opening and closing direction is the horizontal direction, but the present invention is not limited thereto. The mold clamping device 100 may be a vertical mold clamping device in which the mold opening/closing direction is the vertical direction. When the mold clamping device 100 is a vertical mold clamping device, the lower mold is attached to the table 520, and the table 520 is rotatably attached to the lower platen. The rotation center line 520X of the table 520 is parallel to the vertical direction. An upper platen is arranged above the lower platen, and an upper die is mounted on the upper platen. The upper pressure plate is a movable pressure plate, and the upper die is a movable die. And the lower pressing plate is a fixed pressing plate, and the lower die is a fixed die.

Further, although the table 520 of the above embodiment is rotatably attached to the movable platen 120, the present invention is not limited thereto. The table 520 may be slidably attached to the movable platen 120. The sliding direction is a direction perpendicular to the mold opening and closing direction. In the case where the mold clamping device 100 is a vertical mold clamping device, the table 520 is slidably attached to the lower platen.

When the mold clamping device 100 is a horizontal mold clamping device and the table 520 is slidably attached to the movable platen 120, the 1 st table pin 540 and the 2 nd table pin 550 slide together with the table 520. When the mold clamping device 100 is a horizontal mold clamping device and the table 520 is slidably attached to the movable platen 120, the table pin 560 slides together with the table 520.

Similarly, when the mold clamping device 100 is a vertical mold clamping device and the table 520 is slidably attached to the lower platen, the 1 st table pin 540 and the 2 nd table pin 550 slide together with the table 520. When the mold clamping device 100 is a vertical mold clamping device and the table 520 is slidably attached to the lower platen, the table pin 560 slides together with the table 520.

Claims (5)

1. An injection molding machine is provided with:

a table on which a mold main body is mounted;

a platen on which the table is rotatably and/or slidably mounted;

a table pin disposed inside the table; and

an ejector device for advancing and retreating a movable portion which is disposed inside the die main body and ejects a molded product by the table pin,

the mold main body portion forms a 1 st molding portion for molding a 1 st molded article and a 2 nd molding portion for molding a 2 nd molded article including the 1 st molded article as a part,

the push-out position of the movable portion in the 1 st molding portion is different from the push-out position of the movable portion in the 2 nd molding portion.

2. The injection molding machine according to claim 1,

the movable part has a 1 st movable part and a 2 nd movable part,

the ejector presses the 1 st movable portion in the 1 st molding portion and presses the 2 nd movable portion in the 2 nd molding portion.

3. The injection molding machine according to claim 2,

the table pin has a 1 st table pin for pressing the 1 st movable part and a 2 nd table pin for pressing the 2 nd movable part.

4. The injection molding machine according to claim 2 or 3,

the table pin is disposed in the table so that a position of the table pin relative to the movable portion can be freely changed,

the ejector presses the 1 st movable portion in the 1 st molding portion and presses the 2 nd movable portion in the 2 nd molding portion.

5. The injection molding machine according to any one of claims 2 to 4,

the movable part is disposed in the die main body so that the position of the movable part relative to the table pin can be freely changed,

the ejector presses the 1 st movable portion in the 1 st molding portion and presses the 2 nd movable portion in the 2 nd molding portion.

Images