JPS6311317A - Molding device - Google Patents

Abstract

PURPOSE:To improve a productivity of a device, while providing a highly precise smoothness and a high dimension accuracy by a method in which at mold opening, a first supporting part sets a molded product in a cooling mold from the injection mold and a second supporting part removes the molded product from the cooling mold, and then at the time of mold clamping, the first and second supporting parts are on standby. CONSTITUTION:In a state of mold clamping, a removing mechanism 40 is on standby spaced from each mold 10, 20, and molten resin is injected into the cavity 13 of the injection mold 10 from the nozzle of an injection machine. Since the temperature of the molding surface of the injection mold 10 is relatively high, the fluidity of the molten resin is not decreased, and highly precise smoothness is obtained. Simultaneously with injection molding, other dish portion 91' is contracted under cooling in the cavity 23 of the cooling mold 20. At the time of mold-opening, the first supporting part 45 removes a molded product 91 from the injection mold 10 with the movement of a transferring member 41, and sets it in the cooling mold 20. Almost simultaneously therewith, the second supporting part 46 removes the molded product 91 from the cooling mold 20. Injection molding and cooling and further the removal of a molded product from the injection mold and the mold for cooling may be simultaneously carried out. Therefore, its productivity is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a molding apparatus for molding precision molded products such as magnetic disk substrates.

(Prior Art) Recently, a technology for injection molding magnetic disk substrates from plastic has been developed. This magnetic disk board is
It is lightweight, has high-precision smoothness achieved through injection molding, and does not require grinding and polishing, making it possible to achieve high productivity.

Since the above-mentioned plastics are required to have heat resistance, materials with a high melting temperature of around 400° C. are selected, but there are various problems that need to be solved when molding them.

In general injection molding methods, the mold is cooled at room temperature or
This method cannot be applied to the above magnetic disk substrate. This is because the high-temperature molten resin comes into contact with the molding surface of the mold and is rapidly cooled, resulting in poor fluidity and the injection pressure not acting sufficiently on the molten resin, resulting in poor transferability and the inability to achieve high-precision smoothness. It is.

In the case of injection molding of precision products, a known technique is to heat only the vicinity of the molding surface of the mold by high-frequency heating or the like before injection molding to raise the temperature by +1 to near the glass transition point of the resin, and then cool it after injection. However, with this method, it is only possible to uniformly heat the molding surface.

For this reason, a technology has been developed to improve transferability by increasing the temperature of the entire mold before injection starts, and then cooling the mold to a lower temperature after injection (a temperature at which no deformation occurs due to cooling shrinkage). I'm here.

(Problem to be Solved by the Invention) However, when executing the mold temperature control cycle as described above, especially when using resin with a high melting temperature, the temperature difference between the upper and lower limits is large, and this temperature control As a result, the molding cycle becomes longer, resulting in extremely low productivity and high energy consumption, which is uneconomical. Furthermore, the mold requires rigidity in order to achieve precision, and has a thick wall and large heat capacity, so the above-mentioned drawbacks are noticeable.

(Means for Solving the Problems) This invention has been made to solve the problems mentioned above. It comprises a mold, a cooling mold that cools the injection molded product, a pair of support stands that support the mold halves of each mold, and a take-out mechanism that takes out the molded product. , is constructed by providing the moving member with first and second support parts having a vacuum suction function, and when opening the injection mold and the cooling mold,
The molded product is taken out from the injection mold as the first support part or the movable member moves and is placed in the cooling mold, and at the same time as the molded part is taken out from the second support part or the first support part, the molded product is removed from the cooling mold. The molding apparatus is characterized in that, when a molded product is removed from the mold and the injection mold and the cooling mold are clamped, the first and second support parts stand by at positions separated from both the molds.

(Function) Since injection is performed while the temperature of the injection mold is kept relatively high, good transfer can be achieved and highly accurate smoothness can be obtained.

Injection molding is performed using an injection mold, and cooling is performed using a single cooling mold, so there is no need to perform temperature control cycles with large temperature differences between these molds, which shortens the molding cycle and Energy consumption can be reduced.

Since the injection mold and cooling mold are supported on a common support base, injection molding and cooling can be performed at the same time.
Productivity can be improved.

In the take-out mechanism, the molded product can be taken out from the injection mold and the cooling mold at approximately the same time by the first and second support parts provided on the moving member, so productivity can be improved.

(Example) Hereinafter, this invention will be described as a magnetic disk substrate (precision molded product).
An example of an apparatus for molding will be explained based on the drawings.

In FIG. 1, 10 is an injection mold, and 20 is a cooling mold. Each mold 1.0.20 is fixed mold 11.2 respectively
1 (mold half) and movable mold 1.2.22 (mold half). The fixed mold 111.21 is supported by a common fixed fixed die plate 31 (support stand), and the movable mold 12.22 is supported by a common movable gouly plate 32 (support stand). A balancer 33 is installed on the stationary side goo plate 31 and the movable side goo plate 32, respectively.
．． 34 is fixed. Each mold 1.0.20 and balancer 33.34 are arranged in a horizontal line at intervals along a horizontally extending Y-Y' axis. The mechanism for horizontally moving the movable gouly plate 32 with respect to the stationary gouly plate 31 along X-X' is the same as that of a normal injection molding apparatus.

Molding recesses 11a and 21a are formed in the fixed mold 11 and the movable mold 12 of the injection mold 10, and the molding surfaces thereof are mirror-finished with high precision. At the time of mold clamping, a cavity 13 is formed by these molding recesses 11a and 12a.

A hole 11b is provided in the center of the fixed mold 11 and the movable mold 12.

12b is formed, and a core 14.15 and a sleeve 16,1? are formed in these holes 11b, 12b. is stored.

The core 14 of the fixed mold 11 also serves as a sprue pusher and has a sprue 4a. Further, an ejecting pin] 8 passes through the fan 15 of the movable die 12.

The fixed mold 11 and the movable mold 12 have a spiral medium passage 1.
9 are formed, and a cooling medium flows through one of these medium passages. The temperature of this cooling medium is set to be relatively high and about 20 to 30°C lower than the glass transition point of the resin material. For example, if the glass transition point of the fat is around 200°C, set it at 170 to 180°C.

The fixed mold 21 and the movable mold 221 of the cooling mold 20 are formed with molding recesses 21a and 22a, and their molding surfaces are mirror-finished with high precision. At the time of mold clamping,
The cavity 23 is formed by these molding recesses 21a and 22a.
is formed. The width of this cavity 23 is slightly narrower than the width of the cavity 13 of the injection mold 10.

A hole 211) is provided in the center of the fixed mold 21 and the movable mold 22.

221) is formed, a fixed fan 24 is housed in the hole 21b of the fixed mold 21, and the hole 221 of the movable mold 22 is
) is housed with a fan 25 and a sleeve 27.

A spiral medium passage 29 is formed in each of the fixed mold 21 and the movable mold 22, and a cooling medium at a relatively low temperature, for example, room temperature, flows through the medium passage 29.

A take-out mechanism 40 is arranged next to the cooling mold 20.

The second take-out mechanism 40 has a long moving member 41 that can be bent by a hinge 42 . The moving member 41 is movable along two horizontal axes that are perpendicular to each other, that is, the x-x' axis and the Y-Y' axis.

A first support portion 45 is provided at the tip of the moving member 1, and a second support portion 4 is provided between the first support portion 45 and the hinge 42.
There are 6. As shown in FIGS. 5 to 7, the first support section 45 has a support plate 17 fixed to the distal end of the moving member 41. As shown in FIGS. This support plate 47
A four part 47a is formed in which a sprue, which will be described later, can be inserted.

1 on the movable side guide plate 32 side of the support plate 47.
A suction cup 48 is provided around the recessed portion 47a. These suction cups 48 are connected to a vacuum suction device (not shown).

A chuck mechanism 50 is provided on the surface of the support plate 47 on the fixed side plate 31 side. This chuck mechanism 50 has a pair of claws 51, 51 that can clamp a sprue portion 92 (described later) using electromagnetic force, and four semicircular parts 51a are formed in the middle of these claws 51. has been done.

The second support part 16 has a suction cup 48 similar to the second support part 45, but does not have a chuck mechanism 50.

In the above-described configuration, in the mold-clamped state shown in FIG. 1, the ejecting mechanism 40 is separated from each of the molds 10 and 20 and is on standby. In this state, the molten resin is injected from an injection nozzle (not shown) into the cavity 13 through the sprue 14a of the injection mold 10. During this injection, the four molding parts 11a of the injection mold 10 are injected.

As mentioned above, the temperature of the molding surface of 12a is slightly lower than the glass transition point and relatively high temperature, so the fluidity of the molten resin is not impaired and the molten resin is subjected to injection pressure to form a mirror-like molding surface. Because of the close contact, it is possible to perform extremely good transfer and obtain highly accurate smoothness.

The molten resin is cooled to a surface temperature below the glass transition point in an injection mold 10 and shaped. Shaped molded product 90
has a disk portion 91 and a sprue portion 92.

At the same time as the above-mentioned injection molding, another disk portion 91' whose center is hollowed out is cooled and compressed in the cavity 23 of the cooling mold 20. It should be noted that this disk portion 91' has injection molded metal transferred thereto from 10 by a function described later. In the cooling mold 20, the clamping force plastically deforms and compresses the center of the tree of the disc part 91', and
C or lower (temperature at which no deformation occurs due to cooling shrinkage)
Cool to obtain a molded product of maximum f8 as a magnetic disk substrate. By the compression cooling described above, the final molded product can be reliably prevented from deformation such as warping caused by shrinkage due to cooling. Furthermore, even if there are minute non-uniformities in the wall thickness, it is possible to correct them and make them uniform.

After the above-mentioned injection molding and cooling compression are completed, the movable gouly plate 32 moves in the X' force direction in the figure, and the movable mold 12.2
2 and balancer 3/I move in the same direction (Figure 2). At the beginning of this movement, the fixed mold 1 of the injection mold 10
Since injection mold 1 also moves slightly in the X' force direction, injection mold 1 (
) has a mold clamping state M[. At this time, core 14.
The molded product does not move by only 15, but moves slightly relative to sleeve 16 and 17! A disk with the JO cut and the center hollowed out! J1 and sprue part 92
It is separated into Note that the cooling mold 20 begins to open when the movable side Guiplay 1, 32 begins to move, and the balancer 33. :l will also start opening at the same time.

The fixed mold] 1 stops after moving a certain amount as described above, and after that, the movable gou plate 32 and the movable mold 12.2
2 and balancer 34 continue to move. As a result, the third
As shown in the figure, the injection mold 20 is also opened.

In the process of opening the mold, the sleeve 17 of the movable mold 12 protrudes a little, thereby releasing the disk part 91 that is in close contact with the molding surface of the four molding parts 12a.

Since this disk portion 91 is only moved by a small amount, it is supported by the peripheral wall of the molding recess 12a.

During or after the mold opening, the moving member 41 of the ejecting mechanism 40 moves in the Y direction, and as a result, the first support part 45
is disposed between the fixed mold 11 and the movable mold 12 of the injection mold 10, and the second support part 16 is located between the fixed mold 11 and the movable mold 12 of the injection mold 10.
1 and the movable mold 22. The moving member 41 moves further in the direction of the X' force, bringing each support 4.5, 46 closer to the moving mold 12.22.

Next, the core 15 and sleeve 17 of the movable mold 12 of the injection mold 10 protrude to move the disk portion 91 to the first support portion 45 in a standby state. Then, the disk portion 91 is vacuum-suctioned by the suction cup 48 of the first support portion 45 . Also,
The ejector pin 18 protrudes and the sprue part 92 is inserted into the disc part 9.
The fixed mold 11 is moved further in the direction of the fixed mold 11. and,
It is held between a pair of claws 51 of a chuck mechanism 50. At this time, nail 5
Since the sprue part 92 is housed in the four parts 51a of -11=1, it can be held securely.

At the same time as the transfer, the disk portion 91 and the sprue portion 92 are received by protruding the core 25 and sleeve 27 of the movable mold 22 of the cooling mold 20, and moving the disk portion 91' to the second support portion 46 in a standby state. move it. Then, the sprue portion 92 is vacuum-sucked by the suction cup 48 of the second support portion 46 .

Next, the moving member 41 moves in the X direction, and each support part 45
, 46 or move back from the mobile type 12.22. Thereafter, the moving member 41 moves in the Y' direction, and as shown in FIG. 4, the first support part 45 reaches the position of the cooling mold 20, and the second support part 46 leaves the cooling mold 20.

Further, the moving member 4.1 moves in the direction of the X' force, and as a result, the first support part 15 approaches the movable mold 22, and the disk part 91 supported by the first support part 45 is fitted into the core 25. Then, after the vacuum suction by the suction cup 48 is released, the moving member 41 moves in the X direction, and the first support part 45
leaves the mobile mold 22. In this way, the disk portion 91 is transferred or transferred. In addition, the core 25 and the sleeve 2
7 protrudes, the disk portion 91 is attached to this sleeve 27.
Since it is positioned at the tip of the disc part 91 and is away from the molding surface of the four molding parts 22a, only one surface of the disc part 91 is not cooled first.

Further, at the same time as the vacuum suction on the first support part 45 is released, the vacuum suction on the second support part 46 is released, and the disc part 91' falls to the product receiving part below.

Next, the moving member 41 moves in the Y' direction and returns to the standby state shown in FIG. In the first support section 45, when the standby position is reached, the chuck mechanism 50 is activated suddenly, and the sprue portion 92 falls into the product receiving section.

Next, the movable gouly plate 32 is brought close to the stationary gouly plate 31 again and the molds are clamped.

In the above molding process, the injection mold 10 and the cooling mold 2
The temperature at zero only needs to be maintained constant, and a temperature control cycle that includes transitions from high to low temperatures and from low to high temperatures is not executed, so the molding cycle can be shortened and energy can be saved. Vero.

As described above, during mold clamping, injection molding is carried out in the injection molding die 10 and compression cooling is carried out in the cooling die 2 ( ), and two processes are executed at the same time, resulting in high productivity. When opening the mold, the first support part 45 takes out the disk part 91 and the sprue part 92 of the molded product 90 from the injection mold 10, and the second support part 46 takes out the cooling mold 2.
The disk portion 91' is taken out from zero, and the work of taking out can be done quickly, resulting in high productivity.

Note that when molding is stopped, the movable member 41 is moved by the hinge 42.
Fold it at a right angle.

The method of this invention is not limited to the first embodiment and can be modified in various ways. For example, a portion of the sprue may not be supported by the first support portion, but may be pushed out by an ejector pin and dropped.

(Effects of the Invention) As explained above, in the present invention, since the transfer can be performed well, highly accurate smoothness can be achieved and high dimensional accuracy can be obtained. Moreover, it is not necessary to perform a mold temperature control cycle with a large temperature difference, so the molding cycle can be shortened and energy consumption can be reduced.

In addition, since injection molding and cooling can be performed simultaneously, and molded products can be taken out from the injection mold and the cooling mold at the same time, productivity can be improved.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIGS.
Fig. 4 is a cross-sectional view explaining the operation of the molding device in order;
The figure is a partially sectional plan view of the first support part, FIG. 6 is a front view of the first support part, and FIG. 7 is a front view of the chuck mechanism. 10... Injection mold, 20... Cooling mold, 11°21... Mold half (solid mold), 12.22... Movable mold (mold half), 31.32...・Support stand (Gui plate)
, 90... Molded product, 91'... Molded product (disc part).

Claims (1)

[Claims] (1) An injection mold that injects molten resin and performs shaping at a relatively high temperature region, a cooling mold that cools the injection molded product, and a pair that supports each mold half of each mold. Equipped with a support stand and a take-out mechanism for taking out the molded product,
This ejecting mechanism is constructed by providing the moving member with first and second supporting parts that have a vacuum suction function, and when opening the injection mold and the cooling mold, the first supporting part moves the moving member. At the same time, the molded product is taken out from the injection mold and set in the cooling mold, and the second support part takes out the molded product from the cooling mold at about the same time as the first support part takes out the molded product, and the molded product is removed from the injection mold. A molding device characterized in that, when the molding mold and the cooling mold are clamped, the first and second support parts stand by at positions separated from these molds.