JPH07308935A - Composite type injection molding device - Google Patents

Abstract

PURPOSE:To provide a composite type injection molding device which can efficiently manufacture an infection molded product such as a polygon mirror, a reflecting mirror or a lens for a laser beam. CONSTITUTION:Two mold clamping devices 211, 212 possessing injection molds 22, 23, one injection part unit 31 supplying a molding material to molds of the mold clamping devices 211, 212 and a slide mechanism 38 moving the injection part unit 31 selectively to the two mold clamping devices 211, 212 are provided.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a composite injection molding apparatus.

[0002]

2. Description of the Related Art A conventional composite type injection molding apparatus comprises a mold clamping device for opening and closing a mold for injection molding, and an injection section unit for filling the mold with a material such as synthetic resin melted and heated. And are configured as one. In the injection molding cycle by such a composite type injection molding apparatus, it took a long time to cool the molded product. for that reason,
Until the cooling of the raw materials in the mold was completed, the injection unit had to maintain the waiting state. In particular, in the case where rapid cooling cannot be performed such as with precision members such as lenses, the waiting time becomes longer and the efficiency drops. Further, it is desirable that the precision molded product does not undergo movement such as moving the mold until it is sufficiently cooled.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the problems of the conventional composite type injection molding apparatus described above, and it is possible to provide injection molded articles such as a polygon mirror for a laser beam, a reflection mirror and a lens.
An object of the present invention is to provide a composite-type injection molding device that can be efficiently manufactured.

[0004]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention is directed to a plurality of mold clamping devices and a smaller number of injection parts than the mold clamping devices for supplying a molding material to a mold attached to the plurality of mold clamping devices. It is characterized in that it is provided with a unit and a moving device for moving the injection unit to a plurality of mold clamping devices. In the simplest case, one injection part unit is provided for two mold clamping devices, and this injection part unit is moved by the moving device according to the molding cycle of the molds of the two mold clamping devices. It can be selectively moved with respect to the mold clamping device of the table. In addition, a storage device for storing the respective molding conditions for the molds provided in the plurality of mold clamping devices is provided, and the plurality of mold clamping devices are moved according to the molds of the mold clamping device that the injection unit unit moves and injects. Specific molding conditions can be selected from the molding conditions of. For example, the injection unit may inject the resin material into the injection mold of any one of the mold clamping devices, and then move the mold material to the next mold clamping device before or during the movement to the next mold clamping device. The metering of the resin material can be started for the injection mold of the device.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described below with reference to illustrated embodiments. The composite type injection molding apparatus 10 according to the present invention includes two mold clamping devices 21 (211 and 21) on the same base 11.
2) and one injection unit 31. Two
Since the same mold clamping device 21 can be used,
In this embodiment, the same mold clamping device 21 is used. Then, in each of the mold clamping devices 211 and 212, the same reference numeral is given to each component, and the configuration will be described based on the first mold clamping device 211. Note that the present invention can use different mold clamping devices, and the number of mold clamping devices is three.
More than two units may be used, and the number is not limited to two.

On the base 11, a pair of support plates 25 and 26 are fixed in parallel with each other with a predetermined length apart in the mold clamping direction (horizontal direction in the drawing), and between the support plates 25 and 26, A plurality of guide rods 27 are fixed in parallel with each other. The first mold clamping device 211 includes a pair of support plates 25,
Fixed mold 22 located between 26 and this fixed mold 2
A movable mold 23 that moves toward and away from the movable mold 23 is provided, and the movable mold 23 is integrally fixed to a movable mold clamping plate 24. The movable clamping board 24 is slidably supported by a guide rod 27.

The movable mold clamping plate 24 is fixed to a pithlon rod 28a of a cylinder mechanism 28 fixed to a support plate 25 at the end of the base 11, and is moved between a mold clamping position and a molded product take-out position. In the figure, the right direction is the mold clamping direction, the left direction is the mold opening, and the molded product take-out direction.
3 to 3 represent mold closed states.

On the other hand, the injection unit 31 supplies the molten molding material to the first mold clamping device 211 on the guide rail 36 fixed on the base 11 in the mold clamping and fixed in the direction orthogonal to the mold opening direction. It is configured to be movable to a possible first position (see FIG. 1) and a second position (see FIG. 2) where the molten molding material can be supplied to the second mold clamping device 212. That is, the injection unit 31 is slidably supported by the guide rail 36 via the slide base 35 fixed to the main body 32. A support plate 37 fixed to the base 11 is located at one end of the guide rail 36.
A slide mechanism 38 that operates in a direction parallel to the guide rail 36 is fixed to the support plate 37. The piston rod 38a of the slide mechanism 38 is connected to the slide base 35, and the slide mechanism 38 moves the ejection unit 31 to the first position and the second position.

The injection unit 31 is provided with an injection nozzle 33 at the tip (left end in the figure) of the main body 32, and an injection unit advancing / retreating slide mechanism 34 for advancing / retreating the injection nozzle 33 at the rear end. The injection nozzle 33 is connected to a nozzle port (not shown) formed in the mold 22 when the injection unit advance / retreat slide mechanism 34 advances forward. The injection unit 31 is configured such that the molten molding material is applied to the mold 2 while the injection nozzle 33 is connected to the nozzle opening.
Inject into 2 and 23 and fill. 39 is a hopper which stores the raw material of a melt molding material.

The movable clamp 24, the cylinder mechanism 28, the injection unit advancing / retreating slide mechanism 34, and the slide mechanism 38 described above are connected to a hydraulic or pneumatic device (not shown) and driven by this hydraulic device or the like. The hydraulic system and the like are sequentially controlled by a computer.

In this composite-type injection molding apparatus, the first and second mold clamping devices 211 and 212 are independently operated to repeat the mold clamping, mold opening, mold clamping ... , Nozzle connection, filling, nozzle separation, movement, nozzle connection ... The cycle is repeated.

The above cycle will be described in detail. In the initial state, the composite-type injection molding apparatus of this embodiment has the first and second
211 and 212 are in the mold closed state, and the injection unit 31 is at a position facing the first mold clamping device 211. The injection molding process starts from this state.

The process of the injection unit 31 is as follows. The injection unit advance / retreat slide mechanism 34 is projected to connect the injection nozzle 33 to the nozzle opening of the mold clamping device 21, and the molten molding material is filled in the molds 22 and 23. When the filling is completed, the injection unit advance / retreat slide mechanism 34 is retracted to separate 33 from 22. The slide mechanism 38 is driven to move the injection unit 31 to the other mold clamping device 21. The above steps 1 to 2 are the first and second mold clamping devices 211, 2
Repeat for 12 alternately.

On the other hand, the mold clamping device 21 filled with the molten molding material executes the following steps while the injection section unit 31 executes the steps ,. i) Wait for the injection molding unit 31 to fill the molten molding material. ii) When the molten molding material in the molds 22 and 23 is sufficiently cooled, the movable mold clamping plate 24 is driven to separate the movable mold 23 from the fixed mold 22 and open the molds. iii) The cylinder mechanism 28 is pulled in and driven to move to the molded product takeout position. At the molded product take-out position, the molded product is taken out from the moving mold 23. iv) After the molded product is taken out, the cylinder mechanism 28 is driven to move to move the movable mold 23 to the mold closing position. v) The movable mold clamping board 24 is driven to close the mold. Then, the process returns to the above i).

The first and second mold clamping devices 211, 212,
And the injection unit 31 is above, i) to v).
By repeating the cycle consisting of the steps described above, the injection-molded product can be efficiently manufactured without the injection unit 31 playing.

4 to 8 show a second embodiment of the present invention. In this embodiment, the molded product is a lens, and the mold clamping direction of the mold clamping device and the moving direction of the injection nozzle of the injection unit are the vertical direction. The base 51 has two mold clamping devices 61 (611, 61) which are vertically oriented.
2) is provided. The two mold clamping devices 61 are
In this embodiment, the same mold clamping device 61 is used. Then, in each of the mold clamping devices 611 and 612, the same reference numeral is given to each component, and the first mold clamping device 611 will be described.

On the base 51, a pair of support plates 65 and 66 are fixed in parallel with each other with a predetermined length apart in the mold clamping direction (vertical direction in the drawing). The mold 62 is fixed, and the cylinder mechanism 68 is fixed to the lower support plate 66. A movable mold clamping plate 67 is connected to the piston rod of the cylinder mechanism 68, and a movable mold 63 corresponding to the fixed mold 62 is fixed to the movable mold clamping plate 67. The moving die 63 has the cylinder mechanism 6
By 8, the mold is moved to a mold clamping position that approaches the fixed mold 62 and a molded product take-out position that separates.

An XY slide unit 70 is fixed on the upper support plate 65. This XY slide unit 70 selectively moves one injection unit unit 71 onto two mold clamping devices 611 and 612, and moves the injection unit unit 71 in the vertical direction on each mold clamping device. And a pair of parallel X-direction rails 72 and an X-table 7 movably supported by the X-direction rails 72.
3 and a Y-direction rail 74 provided on the X-table 73 in the vertical direction orthogonal to the X-direction rail 72. The ejecting unit 71 includes the Y-direction rail 74.
It is supported so that it can be raised and lowered. The X table 73 can be moved along the X-direction rail 72 to a first position corresponding to the first mold clamping device 611 and a second position corresponding to the second mold clamping device 612. A cylinder mechanism or a feed screw mechanism can be used for the driving force in the X and Y directions.

As shown in FIG. 6, the fixed mold 62 and the movable mold 63 are provided with a plurality of lens molding upper molds 81 and a plurality of lens molding molds 82, respectively, and a nozzle port 83 for receiving the molten resin material supplied from the injection unit 71. A resin passage 84 for guiding the resin material supplied to the nozzle port 83 to a molding space 86 formed by the lens molding upper mold 81 and the lens molding lower mold 82 is formed. The injection unit 71 includes the injection unit 71 and the mold clamping device 611.
Alternatively, an injection nozzle 76 connected to the nozzle port 83 when descending above 612 is provided. 79 is a hopper.

FIG. 8 is a time chart showing an operation example of the present injection molding apparatus having the above-mentioned configuration. The fixed mold 62 and the movable mold 63 (mold A) of the mold clamping device 611 are clamped, and the X table 73 (injection unit 71) is moved onto the mold A along the X-direction rail 72. Next, the injection unit 71
Is lowered along the Y-direction rail 74, and the injection nozzle 76
Is connected to the nozzle opening 83 of the fixed mold 62. In this state, the injection screw 77 (rod, FIG. 7) in the injection nozzle 76 of the injection unit 71 is pushed out, and the molten resin material is constituted from the resin passage 84 by the lens forming upper die 81 and the lower die 82. It is injected into the molding space 86 and pressure is maintained until the gate 87 is sealed.

Next, the injection unit 71 (the injection nozzle 7)
With 6) still positioned on the mold A (without moving), the molding conditions on the computer are changed for the fixed mold 62 and the movable mold 63 (mold B) of the next mold clamping device 612. The molding conditions are a number of parameters such as the amount of resin, the moving speed of the injection screw 77 at the time of injecting the molten resin, and the pressure applied to the injection screw 77, and are stored in a storage device (not shown). Then, the resin amount under the molding condition B is measured and stored in the injection unit 71. Figure 7
As shown in, the injection screw 77 in the injection nozzle 76
Is a work of reversing while rotating, to heat and melt the resin material from the hopper 79, and store it in the molten resin chamber 78. The amount of measured resin is detected by monitoring the position of the injection screw 77.

When the weighing is finished, the ejection unit 71 is moved up along the Y-direction rail 74, and then the X table 73 (ejection unit 71) is moved along the X-direction rail 72.
Moves onto the mold clamping device 612 (mold B). The fixed mold 62 and the movable mold 63 (mold B) of the mold clamping device 612 are clamped during this time, and the injection unit 71 is lowered toward the mold B along the Y-direction rail 74 to perform injection. The nozzle 76 is connected to the nozzle port 83 of the fixed mold 62. In this state, the injection screw 77 in the injection unit 71 is pushed out to inject the molten resin material from the resin passage 84 into the molding space 86 composed of the lens molding upper mold 81 and the lower mold 82, and the gate is opened. Hold pressure until sealed. Next, as in the case of injecting into the mold A, the injection unit 71 (injection nozzle 76) is not moved from above the mold B, and the fixed mold 62 and the movable mold 63 (the mold) of the next mold clamping device 611 are moved. Change the molding conditions on the computer for A) and measure the resin amount for molding condition A. Then, when the weighing is completed, the injection unit 71 moves onto the mold A.

In the mold A, the weighing for the mold B, the sliding movement of the ejection unit 71, and the ejection unit 71 are performed.
During the injection of the resin material by the method, cooling progresses, and when the temperature reaches a predetermined temperature, the fixed mold 62 and the moving mold 63 are opened, and the molded lens is taken out. After that, the fixed mold 62 and the movable mold 63 of the mold A are clamped again to prepare for the next molding.

Similarly in the mold B, when the cooling progresses to a predetermined temperature during the weighing for the mold A, the sliding movement of the injection unit 71, and the injection of the resin material by the injection unit 71, the fixed metal is used. The mold 62 and the movable mold 63 are opened, the molded lens is taken out, and then the fixed mold 62 and the movable mold 63 are clamped again to prepare for the next molding. Therefore, one injection unit 71 can mold a lens using the two mold clamping devices 611 and 612.

In the above-described embodiments, the configuration is such that the number of mold clamping devices is two and the number of injection unit units is one. However, the present invention has a smaller number of injection unit units than a plurality of mold clamping devices. It may be a movable structure. Also, the mold clamping device,
The structure of the injection unit is not limited to the embodiment shown in the drawings, and can be applied to various mold clamping devices and injection units.
Further, in the above embodiment, for the two mold clamping devices,
It was decided to move one injection unit alternately, but 2
Depending on the cooling cycle of the molded product of the die clamping device AB of the table, it is of course possible to move the mold in a cycle of AABAAB.

[0026]

As is apparent from the above description, the present invention is
Since the number of mold clamping devices is larger than the number of injection unit units and the injection unit units are moved with respect to the mold clamping device to perform injection molding, it is possible to operate the injection unit units efficiently. Precision injection molding with long cooling time can be performed efficiently.

[Brief description of drawings]

FIG. 1 is a plan view showing an essential part of a first embodiment of a composite-type injection molding apparatus of the present invention.

FIG. 2 is a plan view showing a main part of the embodiment in a different state.

FIG. 3 is a front view of the embodiment.

FIG. 4 is a front view showing an essential part of a second embodiment of the composite-type injection molding apparatus of the present invention.

FIG. 5 is a side view of the same.

FIG. 6 is a schematic view showing an example of a lens forming die provided on a fixed die and a movable die.

FIG. 7 is a schematic cross-sectional view of an injection nozzle section of the injection section unit.

FIG. 8 is a diagram showing an operation example of the second embodiment.

[Explanation of symbols]

 11 51 Base 21 61 Clamping Device 211 611 1st Clamping Device 212 612 2nd Clamping Device 22 62 Fixed Die 23 63 Moving Die 24 Movable Clamping Plate 25 Support Plate 26 Support Plate 27 Guide Rod 31 71 injection unit unit 33 76 injection nozzle 34 injection unit forward / backward slide mechanism

Claims (4)

[Claims] 1. A plurality of mold clamping devices; a smaller number of injection unit units than the mold clamping device that supplies a molding material to a mold attached to the plurality of mold clamping devices; and a plurality of the injection unit units. And a moving device for moving to the mold clamping device. 2. The injection unit according to claim 1, wherein the injection unit is provided for one of the two mold clamping devices, and the moving device selectively selects the injection unit for the two mold clamping devices. The compound-type injection molding apparatus, which is characterized in that 3. The mold according to claim 1, further comprising a storage device for storing respective molding conditions for each mold provided in the plurality of mold clamping devices, wherein the injection unit unit moves and injects. A composite injection molding apparatus in which specific molding conditions are selected from these plural molding conditions according to the mold of the fastening device. 4. The injection unit according to claim 3,
After injecting a resin material into an injection mold of any one mold clamping device and before or during moving to the next mold clamping device, for an injection molding mold of the next mold clamping device To
A composite injection molding machine that starts measuring resin materials.