JPS6241784Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an alternating injection molding apparatus that can alternately perform multiple molding with a simple mechanism.

Conventional injection molding is generally considered to be a single mold, but
Depending on the shape of the product, cooling, plasticizing, taking out the product, inserting the product, etc. each take time, which inevitably reduces the actual operating rate of the machine, making it extremely uneconomical and at the same time inferior to mass production. There are considerable constraints on reducing molding costs.

Various proposals have been made to improve the above-mentioned drawbacks, and for example, Japanese Patent Publication No. 36-10483 is known as one of the prior art.

However, the invention relates to a blow molding machine, and the output of the mold clamping device of the blow molding machine is about 1/10 of the output of an injection molding machine, so this invention is sufficiently usable in terms of strength. However, it cannot be used as a mold clamping device for an injection molding machine.

Furthermore, this invention is based on the condition that the thickness of the right half and the left half of each pair of left and right molds must be the same, which means that the nozzle of the molding machine is fixed. This is because it was placed in that position.

Therefore, in the case of blow molding, the molded product is almost always symmetrical with respect to the center, and naturally the mold is designed so that the right half has the same dimensions as the left half.

Therefore, it can be said that this invention is extremely effective for blow molding.

In contrast, the present invention is a completely new idea to solve the above-mentioned problems.In the case of injection molded products, the center of the molded product is ) There are no symmetrical products, and it is pointless and completely wasteful to make the left and right halves of the mold the same size.

The present invention was devised for this reason and is completely unrelated to the thickness of the mold.

In the present invention, in FIG. 1, the nozzle touch position on the left stage is fixed at the injection port position, or on the right stage, the injection port position moves in the horizontal direction depending on the mold thickness.

The present invention attempts to position the nozzle at an appropriate position by controlling the motor 80 shown in FIG.

Also known is a plastic injection molding machine that uses a plurality of raw material injection tubes and a plurality of sets of molds and operates these raw material injection tubes alternately. (Tokuko Showa 49-
(Refer to Publication No. 7065) However, this injection molding machine requires mold opening/closing cylinders on the left and right sides, and the position of the nozzle is fixed, so the fixed side molds of the left and right molds must be used unless they have the same size. There is a problem that makes it impossible to do so.

On the other hand, the present invention does not require a special mold structure, and the structure after molding is simple and allows the left and right molds to be opened and closed alternately using one set of mold clamping cylinders, making it extremely practical. be.

In addition, there is a molding material containing wood powder, which is one of the materials used to improve the acoustic effects of plastic parts where function and performance are important, but since this material has poor thermal conductivity, it takes a long time to cool down after injection filling. The length becomes extremely long, and productivity is hampered by conventional molding methods.

Based on this technical background, the object of the present invention is to reduce costs, that is, to reduce the costs of molds and molding machines, and to maintain versatility.

In summary, both sides of the left and right mold clamping devices are placed on the same axis and facing each other, and the mold clamping and opening can be performed alternately in one process, and sufficient cooling or In order to be able to perform operations such as insert work and product removal, especially when the nozzle touch position of the left stage is fixed at the injection port position, the position of the injection port may be changed depending on the mold thickness of the right stage. An object of the present invention is to provide an alternating injection molding device that can move horizontally.

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

The injection device, hydraulic drive mechanism, and piping thereof in the device of the present invention are well known, and detailed illustrations and explanations thereof will be omitted.

Reference numeral 10 denotes a pressurizing cylinder, which has rectangular flange portions 11, 11' in the radial direction of the outer circumference at both ends.
A plurality of columns 12..., 12'... are inserted above and below the flange portions 11, 11', and fixed to the flange portions 11, 11' by nuts 13, 13'... which are screwed into the columns. .

At this time, the lower end faces 14, 14' of the flanges 11, 11' are brought into sliding contact with a smooth surface 21 formed on the machine base 20.

Reference numeral 15 denotes a through hole of the pressurizing cylinder 10, into which a ram 30 is fitted, and piston rods 31, 31' are integrally formed at the front and rear of the ram 30 by welding, screwing, or other appropriate known means.

16, 16' are ring members, and the ram 30
The ring members 16, 16 are screwed together to facilitate insertion and fitting into the through hole 15 and to prevent oil leakage in the hydraulic cylinder 10, and are in sliding contact with the outer peripheral surfaces of the piston rods 31, 31'. ' has O-rings 17, 17 on the inner peripheral surface.

Reference numerals 18 and 18' are supply and discharge ports for supplying and discharging pressurized oil into the pressurizing cylinder 10, and are formed close to both ends of the pressurizing cylinder 10.

32, 32' are first movable plates;
The pillars 12..., 12'... are passed through the four corners of the movable plates 32, 32', and one ends of the piston rods 31, 31' are welded, screwed, or by appropriate known means at the center of the back surface of the movable plates 32, 32'. Fix and integrate the two.

33 is a first male type, which is inserted through the pillars 12' and fixed to the back of the first movable platen 32';33' is a first female type, which is inserted through the pillars 12', and is fixed to the back of the first movable platen 32'. 3
3 are fixed to the columns 12' at a predetermined interval by stoppers 39.

Reference numeral 34' denotes a second female mold, which is inserted into the pillars 12' and fixed to the pillars with a stopper 39', and has a split type (movable type) between it and the first female mold 33'.
Hot runner blocks 35, 35' are the pillars 1
2', 12', and the first female mold and the second female mold are attached to the back surface of the split hot runner blocks 35, 35'.

The split hot runner blocks 35, 35'
is of a forced split type, and has injection nozzles 37, 37' to both the front and rear surfaces via a spool 36 on the mating surfaces, and 38 is an injection port for plasticizing material from an injection device.

Reference numeral 34 denotes a second male die which is inserted into the column at a predetermined distance from the second female die 34'.
A second movable plate 38' is fixed to the back of 4, which is inserted through the pillars 12', and the second movable plate 38' is fixed to the pillars 12' through nuts 19', 19'. .

40 is a product molded into the first male mold 33; 41
is a product molded into the second male mold 34.

50, 50' are rods for forcibly dividing the split type hot runner blocks 35, 35', and one end 53 of the rod 50 is connected to the first movable platen 3.
2', and the other end is attached to the runner block 35.
A stopper 52 is formed at the end of the guide member 51 which is fixed to the guide member 51 .

Similarly, one end 53' of the rod 50' is fixed to the second movable platen 38', and the other end is inserted through the guide member 51' fixed to the runner block 35', and a stopper 52' is formed at the end. There is.

60 is a fixed hot runner block whose lower part is fixed to the machine base 20 via bolts 61,
The pillars 12 are inserted into the four corners of the block 60, and an injection port 62 is formed in the center of the block 60, and the spool 6 is inserted through the injection port 62.
Nozzles 63 and 63' are formed for injecting plasticizing material into the left and right molds through the nozzle 4.

A third female die 65 and a fourth female die 66 are fixed to the left and right sides of the fixed hot runner block 60, and are inserted into the support columns 12. 2 Male mold 6 on movable plate 67
5' and 66' are fixed to each other and passed through the pillars 12, and are fixed to the back of the second movable platen 67 by nuts 68.

70 and 71 indicate cavities of the left and right molds.

80 is a motor that rotates the rotating shaft 81 in the forward or reverse direction.

A lead screw 84 is formed on the rotating shaft 81, and is engaged with an injection device 85 that moves forward and backward to the position indicated by the dotted line under the guidance of the lead screw. (See FIG. 2) Reference numeral 82 is a guide rod for preventing the injection device from steadying when moving forward and backward.

86 is a heating cylinder of the injection device 85.

Reference numerals 83 and 83' designate fixed metal members which also serve as stoppers for regulating the stopping device of the injection device 85.

Reference numerals 90 and 91 are stepped portions formed at the front and rear ends of the surface 21 of the machine base 20, and also serve as stoppers for stopping the forward and backward movement of the pressurizing cylinder 10 at a predetermined position.

Next, the operating mechanism of the device of the present invention will be described.

First, by supplying pressurized fluid to the supply/discharge port 18' of the pressurized cylinder 10, when the inside of the cylinder 10 is advanced to the left in the figure, the ram 30 is integrally constructed with the rod 31'. The first movable platen 32' and the first male mold 33 on the right side move forward while being guided by the supports 12', and leave the first female mold 33' of the split hot runner block 35 together with the product (the first female mold 33' is fixed to the support column 12' by a stopper 39 so as not to move together with the male die.) At the same time, the ram 30 is attached to the rod 3.
The first movable platen 32 and the third male mold 65' on the left side, which are integrally constructed with the hot runner block 1', move forward while being guided by the supports 12..., and the third male mold 65' is connected to the fixed hot runner block 60. The pressurized liquid in the cylinder 10 is brought into pressure contact with the third female die 65 which is integrally constructed, but at the same time, the pressurized liquid inside the cylinder 10 is forced to retreat the cylinder 10 to the right in the figure, and the cylinder 10 The strut 12' fixed to the flange portion 11' of...
The second male mold 34, which is integrally constructed with the upper second movable plate 38', is connected to the split hot runner block 3.
The fourth male mold 66' is separated from the second female mold 34' of No. 5 together with the product and is integrally constructed with the second movable platen 67 on the support column 12 which is fixed to the flange portion 11 of the cylinder 10 at the same time. The cylinder 10 is moved back to the right to press against the fourth female mold 66 which is integrally formed with the fixed hot runner block 60, and the lower end face of the flange 11' of the cylinder 10 is pressed against the stopper 91 of the machine base 20. When the pressing is stopped, the fixed hot runner block 60 is clamped from both sides with a predetermined pressure.

Thereafter, while the molded products 40 and 41 on the right side are taken out and the inside of the mold is cleaned, a fixed hot runner is placed in the mold on the left side from which plasticized material is applied from the heating cylinder 86 of the injection molding device 85 to the side surface of the mold. Inlet 62 of block 60, front and back spools 64
The left and right cavities 70 and 71 are filled from injection nozzles 63 and 63', respectively.

In addition, the split hot runners 35, 35' on the right side
can be slid on the struts 12' by the action of the respective engaged rods 50, 50' and separated, so that they can be taken out in the form of a spool in the injection nozzle.

Next, when pressurized liquid is supplied from the supply/discharge port 18 to the left side of the pressurizing cylinder 10, the ram 30 in the pressurizing cylinder 10 is moved forward in the opposite direction to the above-mentioned direction, that is, to the right in the figure. , first movable plate 32,3
2' is advanced at the same time, and at the same time, the cylinder 10 is retreated in the opposite direction to the above-mentioned direction, that is, to the left in the figure, and the second movable platen 67, 38' is moved back, thereby opening the mold on the left side. , the right mold is filled with plasticized material while the right mold is closed and the molded product in the left mold is removed.

Depending on the shape of the product, the injection device performs plasticization for the next injection during the cooling time, and is guided by the lead screw 81 and guide bar 82 by the reversible motor while remaining in its normal state as indicated by the dotted line on the right. This allows for alternate and repeated molding.

As mentioned above, the device of the present invention can alternately perform clamping molding on the left and right sides with one hydraulic cylinder, and
Since injection molding can be performed in two places alternately with a set of injection equipment, it is suitable for mass production when large and thick products require a long time for cooling and plasticizing, etc., and reduces molding costs. The savings benefits are extremely large.

Particularly when the mold wall thicknesses of the left and right stages are different, that is, the position of the nozzle touch on the left stage in Figure 1 is fixed, and the position of the injection port 62 is fixed, but the position of the injection port 62 on the right stage is different depending on the thickness of the mold. 38 can be moved in the horizontal direction, and by controlling this position by a motor 80 shown in FIG. 2, the nozzle can be positioned at an appropriate position.

In addition, in the mold clamping device of the present invention, Example 1
Split hot runner block on the right side,
Although a fixed type hot runner block is shown and described on the left side, the present invention is not limited to this, as long as one of the left and right hot runner blocks is fixed and the other one is of a split type.

[Brief explanation of the drawing]

Figure 1 is a partially sectional side view of the mold clamping device of the present invention, and the right side is an example of a split type hot runner block.
The left side shows an embodiment of a fixed hot runner block. FIG. 2 is a plan view of the injection device used in the mold clamping device of the present invention. Explanation of symbols, 10: Hydraulic cylinder, 30: Ram, 31, 31': Rod, 32, 32': First movable plate, 35, 35': Split type hot runner block, 38', 67: Second movable plate , 60: Fixed hot runner block, 85: Injection device.

Claims (1)

[Scope of Claim for Utility Model Registration] In an injection molding machine equipped with an alternating type mold clamping device in which piston rods are arranged before and after a ram that is fitted into a pressurized cylinder and can move forward and backward, the following (I) ), (b), (c), (d), (e), and (f) are the constituent elements of an alternating injection molding device. (a) A first movable plate shall be connected to the tip of each of the above rods. (b) A second movable platen is disposed opposite to the first movable platen via a hot runner block having injection nozzles on the front and back sides of each facing surface of each of the first movable platens. (c) One of the hot runner blocks is of a fixed type and the other is of a split type. (d) A male or female mold is disposed on the first movable plate and the second movable plate, and a female or male mold is disposed on the hot runner block side. (e) The first movable plate, the second movable plate, the mold, and the hot runner to open and close the first movable plate and the second movable plate, which move forward and backward in synchronization with the movement of the ram in the pressure cylinder. The mold clamping device is formed by inserting the block through the support. (f) The injection device is moved from side to side in synchronization with the opening and closing of the mold clamping device.