JP2003165146A - Mold device for molding - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To increase a cooling capacity on the side of a movable mold in a mold device for molding in which a gate cut sleeve is fitted freely slidably to the movable mold through a cylinder for guiding a slide. <P>SOLUTION: A fixed mold 1, the movable mold 2, and the gate cut sleeve 29 fitted freely slidably through the cylinder 27 for guiding the slide formed in the movable mold 2 are provided. Temperature adjustment passages 28 and 31 for passing a temperature adjusting fluid such as cooling water are provided in the cylinder 27 and the sleeve 29. By passing the fluid through the passages 28 and 31, the cylinder 27 itself is cooled by the passage 28. Moreover, the sleeve 29 itself is cooled by the passage 31. Since the center side of a product cavity 3 which tends to increase temperature during molding can be cooled, the velocity of a molding cycle can be increased. <P>COPYRIGHT: (C)2003,JPO

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a compact disc (CD) and a digital video disc (DVD).
The present invention relates to a mold apparatus for molding optical disks and the like. [0004] The substrate of an optical disk is generally injection-molded with resin. In this molding, a fixed mold provided with a sprue bush and a movable mold provided with a gate cut sleeve attached to a fixed board and a movable board of an injection molding machine are closed, and a product cavity is provided between the fixed mold and the movable mold. Is formed, and a molten thermoplastic resin, which is a molding material injected from a nozzle of an injection molding machine, is filled into a product cavity. After a resin in the product cavity, that is, an optical disk is solidified, a fixed mold and a movable mold are opened. The optical disk that has been molded is taken out. In the fixed type and the movable type, a temperature control passage through which cooling water as a temperature control fluid is provided for cooling and solidifying a molten thermoplastic resin filled in a product cavity or a sprue. As the temperature control passage, there are known a temperature control passage provided along a sprue and the like, in addition to a temperature control passage provided to face a product cavity in a fixed mold and a movable mold. In order to increase the speed of the molding cycle, it is necessary to enlarge the temperature control passage to lower the mold temperature during molding. However, in the movable type, since the gate cut sleeve is slidably provided via the slide guide cylinder, it is provided only in the movable type itself, and the capacity of the temperature control passage is limited. Was. Accordingly, an object of the present invention is to increase the cooling capacity of the movable mold side in a molding die apparatus in which a gate cut sleeve is slidably provided on a movable mold via a sliding guide cylinder. I do. According to the present invention, there is provided a stationary type, a movable type opposed to the fixed type, and a sliding guide cylinder provided on the movable type. A molding die apparatus, comprising: a gate cut sleeve slidably provided by means of a cylinder; and a temperature control passage through which a temperature control fluid is provided in each of the slide guide cylinder and the gate cut sleeve. It is. According to the configuration of the first aspect, the gate cut sleeve and the gate cut sleeve which are movably disposed by passing a temperature control fluid through the temperature control passages provided in the gate cut sleeve and the slide guide cylinder, respectively. The sliding guide cylinder can be cooled. An embodiment of the present invention will be described below with reference to the accompanying drawings. In the figure, reference numeral 1 denotes a fixed mold, 2 denotes a movable mold, and the fixed mold 1 and the movable mold 2, which are molds, move in the vertical direction in FIG. Are formed between each other. The fixed mold 1 has a fixed mold plate 4 as a base and a fixed side support as a base fixed to a surface (upper surface in the drawing) of the fixed mold plate 4 opposite to the movable mold 2. And a plate 5. In addition, the fixed-side receiving plate 5 includes:
A cold sprue bush 6, which is a sprue bush, is fixed to each of the product cavities 3. The head 6A of the cold sprue bush 6 to which the locating ring 7 is fixed is fitted in a recess 8 formed in the fixed-side receiving plate 5. It has a cylindrical projection 9,
The projecting portion 9 further penetrates the fixed-side mold plate 4 from the fixed-side receiving plate 5. In addition, cold sprue bush 6
A raw material supply nozzle 10 is provided on the head 6A. Further, a cold sprue 12 is formed in the cold sprue bush 6 as a material passage extending from the bottom surface of the head 7 to which the raw material supply nozzle 10 is connected to the tip end surface of the protrusion 9. The cold sprue 12 communicates with the product cavity 3 and has a tapered shape whose diameter increases toward the product cavity 3. Further, a first temperature control passage 13 for passing a temperature control fluid such as cooling water is formed in the cold sprue bush 6 so as to surround the cold sprue 12. This temperature control passage 13 has its base end 13A at the head 6A
The distal end 13B is formed annularly coaxially with the protruding portion 9 on the distal end side of the protruding portion 9 via the communication portion 13C. Then, the temperature control fluid flowing from the base end 13A side reaches the distal end 13B via the communication portion 13C, and returns to the temperature control fluid cooling device again via the first discharge path (not shown). . The fixed-side mold plate 4 includes the fixed-side receiving plate 5.
And a cavity block 15 as a cavity forming member fitted inside the positioning frame 14. These cavity blocks 15 form the product cavities 3. An annular outer stamper retainer 16 is detachably attached to the outer peripheral portion of the cavity block 15, and a cylindrical inner peripheral stamper retainer 17 is mounted on the inner peripheral portion.
Is detachably attached. These stamper retainers 16 and 17 are for holding a stamper forming a groove portion and a land portion of the optical disc in the cavity block 15 in a detachable manner. The inner peripheral stamper retainer 17 forms a part of the product cavity 3. Further, a second temperature control passage 19 for passing a temperature control fluid such as cooling water is formed in the cavity block 15. In the second temperature control passage 19, a plurality of grooves are arranged around the projecting portion 9 so as to communicate with each other in an annular or spiral shape. The movable die 2 includes a movable mounting plate 20 mounted on a fixed platen of an injection molding machine, a movable receiving plate 21 fixed to a surface of the movable mounting plate 20 on the fixed mold 1 side, Fixed type 1 of this movable side receiving plate 21
And a movable mold plate 22 fixed to the side surface. The movable mold plate 22 includes a positioning frame 23 fixed to a surface of the movable mold receiving plate 21 on the fixed mold 1 side, and a core block 24 as a cavity forming member fitted inside the positioning frame 23. Has become. The core block 24 forms each of the product cavities 3. Further, the outside (not shown) of the positioning frame 23 is fitted to the outside (not shown) of the positioning frame 14 of the fixed die 1. A third temperature control passage 25 for passing a temperature control fluid such as cooling water is provided in the core block 24.
Is formed. In the third temperature control passage 25, a plurality of grooves are arranged so as to communicate with each other in an annular or spiral shape around a gate cut sleeve described later. Further, on the outer peripheral portion of the core block 24,
The butting ring 26 is fitted. The abutment ring 26 is used to hold the outer peripheral stamper presser on the fixed mold 1 side when the mold is closed.
16 to form the outer peripheral surface of the product cavity 3. Further, a sliding guide cylinder 27 also serving as a compressed gas blow-in / out member is fixed to the inner peripheral portion of the core block 24 so as to face the projecting portion 9 in a penetrating state. A fourth temperature control passage is provided in the sliding guide cylinder 27.
28 are formed. The fourth temperature control passage 28 forms a pair of base ends 28A and 28B in the movable-side receiving plate 21,
The distal end 28C is formed annularly concentrically with the sliding guide cylinder 27 at the tip of the sliding guide cylinder 27, that is, at the product cavity 3 side, and the base ends 28A, 28B and the distal end 28C communicate with each other. The connection is made through a hole 28D. Further, a cylindrical gate cut sleeve 29 is fitted on the inner peripheral side of the sliding guide cylinder 27 so as to be slidable in a predetermined range in the mold opening and closing direction,
A protruding pin 30 is slidably fitted in the gate cut sleeve 29 in a predetermined range in the mold opening and closing direction. The gate cut sleeve 29 is
A fifth temperature control passage 31 for passing a temperature control fluid such as cooling water is formed. This fifth temperature control passage 31
The base ends 31A and 31B are arranged at the base end 29A of the gate cut sleeve 29, and the front end 31C is formed in an annular shape concentric with the gate cut sleeve 29 at the front end of the gate cut sleeve 29, that is, on the product cavity 3 side. The distal end 31C is connected to the proximal ends 31A and 32B through communication holes 31D and 31E. The gate cut sleeve 29 is removably fitted into the sliding guide cylinder 27 of the fixed die 1 via a bearing 32 to form a central opening of the optical disk. Therefore, the protruding sleeve 28 and the slide guide cylinder 27 located on the outer peripheral side of the gate cut sleeve 29 form a part of the product cavity 3. A cold sprue 12 on the fixed die 1 side is provided between the outer peripheral portion of the distal end surface of the projection 9 of the cold sprue bush 6 on the fixed die 1 side and the outer peripheral portion of the distal end surface of the gate cut sleeve 29 on the movable die 2 side. A gate 33 communicating with the cavity 3 is formed. In the drawings, reference numerals 34 and 35 denote supply paths for compressed gas such as air provided in the fixed mold 1 and the movable mold 2, respectively. In the figure, reference numeral 36 denotes a protruding plate which is pressed toward the fixed mold 1 by a pressing rod (not shown) provided on the injection molding machine side. Next, a method for molding an optical disk using the above-described mold apparatus will be described. During molding, first, the fixed mold 1 and the movable mold 2 are closed, and a product cavity 3 is formed between the fixed mold 1 and the movable mold 2. In this state, the abutment ring 26 of the movable mold 2 abuts the outer stamper holder 16 of the fixed mold 1 and the positioning frames 14 and 23 of the fixed mold 1 and the movable mold 2 are fitted to each other. Combine. Then, a molten thermoplastic resin as a thermoplastic molding material is injected from the injection molding machine. This resin is the nozzle
From 10 sequentially passes through the cold sprue 12 and flows into the product cavity 3 from the gate 33 respectively. After the product cavity 3 is filled with resin, the gate cut sleeve 29 is pushed toward the fixed mold 1 by a pressing rod (not shown) provided on the injection molding machine side, so that the gate cut is performed. The sleeve 29 moves toward the fixed mold 1 and fits into the intermediate cylinder 18 of the fixed mold 1. As a result, the cold sprue 12
And the resin in the product cavity 3, that is, the optical disk, is cut. The moving length (stroke) of the gate cut sleeve 29 is indicated by X in the figure. A temperature control fluid is supplied from a temperature control fluid supply source such as a cooler to the base ends 13A and 13A of the first temperature control passage 13.
The resin flows through the communication hole 13C and the tip 13B to cool the resin in the product cavity 3 and the resin in the cold sprue 12, and the temperature control fluid is supplied from the tip 13B through a first discharge path (not shown). Return to source. Further, a temperature control fluid flows from the temperature control fluid supply source through the second and third temperature control passages 19 and 25 to cool the resin in the product cavity 3, and to flow through the second and third discharge passages (not shown). The temperature control fluid returns to the temperature control fluid supply via the control unit. Further, the fluid for temperature control is supplied from the base end 28A of the fourth temperature control passage 28 to the distal end 28C through the communication hole 28C, and the slide guide cylinder 2
7. The resin in the product cavity 3 is thereby cooled, and the temperature control fluid returns to the temperature control fluid supply source through the fourth discharge passage from the discharge side communication hole 28C through the base end 28B. Further, the temperature control fluid is supplied from the base end 31A of the fifth temperature control passage 31 to the front end 31C through the communication hole 31D to cool the gate cut sleeve 29 and, consequently, the resin in the product cavity 3, and The temperature control fluid returns to the temperature control fluid supply source from the hole 31E and the base end 31B through a fifth discharge path (not shown). The first to fifth temperature control passages 13, 19, 2
In 5, 28 and 31, the second and third temperature control passages 19 and 25
, The temperature of the temperature control fluid in the fourth temperature control passage 28, and the temperature of the temperature control fluid in the first and fifth temperature control passages 13 and 31 in this order.
That is, the temperature of the temperature control fluid on the center side of the product cavity 3 is set low, and the temperature of the temperature control fluid on the outside is set high, so that the inside of the product cavity 3 is uniformly cooled as a whole. After the resin in the product cavity 3 is cooled and solidified, the fixed mold 1 and the movable mold 2 are opened.
With the opening of the mold, the molded optical disk and the resin solidified in the cold sprue 12 first separate from the fixed mold 1. Next, the ejection pin 30 is moved to the fixed mold 1 side by a pressing rod (not shown) provided on the injection molding machine side, and ejects the resin solidified in the cold sprue 12 and is released from the movable mold 2. At this time, compressed gas such as air is supplied from the supply passages 34 and 35, and the compressed gas is supplied to the gap between the projecting portion 9 and the inner peripheral stamper retainer 17, the movable mold plate.
The resin in the product cavity 3 and the side of the cavity block 15 and the side of the movable mold plate 22 can pass through the gaps between the sliding guide tube body 22 and the sliding guide cylinder body 27 to perform mold release. Then, the released optical disk is taken out by a take-out robot (not shown). Thereafter, the mold is closed again and the above molding cycle is repeated. According to the configuration of the above embodiment, the fixed die 1
A movable die 2 provided opposite to the fixed die 1; a gate cut sleeve 29 provided on the movable die 2 and slidably provided via a slide guide cylinder 27; The temperature control passages 28 and 31 are provided in the body 27 and the gate cut sleeve 29 for passing a temperature control fluid. The temperature control passages 28 and 31 are slid by the temperature control passage 28 by passing the temperature control fluids through the temperature control passages 28 and 31. The guide cylinder 27 itself is cooled, and further, the gate cut sleeve 29 itself is cooled by the temperature control passage 31, and the cooling thereof cools the center side of the product cavity 3 where the temperature tends to increase during molding. As a result, the speed of the molding cycle can be increased. Further, the front ends 28 of the temperature control passages 28, 31
Since C and 31C are formed in a circular ring shape,
The center side of the product cavity 3 can be uniformly cooled, and the quality can be improved. The first to fifth temperature control passages 13, 19,
In 25, 28, 31 the second and third temperature control passages 19, 25
, The temperature of the temperature control fluid in the fourth temperature control passage 28, and the temperature of the temperature control fluid in the first and fifth temperature control passages 13 and 31. The center side of the product cavity 3 where the temperature tends to increase tends to be actively cooled to uniformly cool the entire resin of the product cavity 3 and the quality can be improved. It should be noted that the present invention is not limited to the above embodiment, and various modifications can be made within the scope of the present invention. According to the first aspect of the present invention, there is provided a fixed type, a movable type provided opposite to the fixed type, and slidable via a sliding guide cylinder provided on the movable type. A molding die apparatus, comprising: a temperature control passage for passing a temperature control fluid provided in the gate guide sleeve and the slide guide cylinder and the gate cut sleeve, respectively.
The cooling capacity near the gate cut sleeve, which tends to increase in temperature during molding, can be increased to speed up the molding cycle.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an overall sectional view showing one embodiment of the present invention. FIG. 2 is a cross-sectional view of a fixed type showing one embodiment of the present invention. FIG. 3 is a sectional view of a movable mold showing an embodiment of the present invention. [Description of References] 1 Fixed mold 2 Movable mold 27 Sliding guide cylinder 29 Gate cut sleeve 28, 31 Temperature control passage

Claims (1)

Claims: 1. A fixed type, a movable type provided opposite to the fixed type, and a gate slidably provided via a sliding guide cylinder provided on the movable type. A molding die apparatus, comprising: a cut sleeve; and a temperature control passage for passing a temperature control fluid provided in each of the slide guide cylinder and the gate cut sleeve.