JP3549287B2 - Composite mold clamping device for injection compression molding - Google Patents

Description

[0001]
[Industrial applications]
The present invention relates to a mold clamping device of an injection molding machine, and more particularly to an improvement of a composite mold clamping device for injection compression molding.
[0002]
[Prior art]
In general, injection compression molding is an injection molding method in which a mold clamping force is generated in a state where both molds are opened by a predetermined amount, that is, in a state where a so-called injection press stroke is set between both molds. . This molding method is preferably employed for crushing the injection molten resin in the mold during injection, for example, in the case of a so-called skin molding method in which the skin is previously inserted into the mold. .
[0003]
Next, the compound mold clamping device is a method of closing both molds first through a boost cylinder and then clamping the mold through a mold cylinder. The composite system has been developed in view of the fact that the configuration of the conventional general system (that is, the toggle system and the direct pressure system) becomes long or complicated. In this combined system, if the mechanism for adjusting the mesh position of the half nut and the fastening means attached to the mold clamping cylinder are mechanically configured (for example, Japanese Patent Application Laid-Open No. 6-182838 or Japanese Patent Application Laid-Open No. In particular, there is an advantage that the configuration is compact and simplified.
[0004]
However, the composite-type mold clamping device having the mechanical structure (hereinafter, simply referred to as a composite-type mold clamping device) is not generally adopted for the injection compression molding for the reason described later.
[0005]
[Problems to be solved by the invention]
The conventional composite mold clamping device for injection compression molding has the following drawbacks.
[0006]
That is, in the conventional composite mold clamping device, the positioning (and fastening) of the half nut fastening means is performed in the mold closed state of the mold, in other words, at the time when the mold closing by the boost cylinder of the mold is completed. It is configured as follows. For this reason, in the conventional composite mold clamping device, the operation of the injection compression molding in which the positioning is performed at a predetermined point in time before the completion of the closing of the boost cylinder is not smooth, and the accuracy is reduced. Had the drawback to do. In addition, since the positioning has to be performed every time the molding conditions are changed, the above-described difficulties are further promoted.
[0007]
In the above-described direct pressure type mold clamping device, setting of the injection press stroke is easily achieved. This is because the mold clamping force is generated over the entire stroke. However, in this case, the positioning accuracy of the stroke is limited due to the hydraulic mechanism, and the difficulty of increasing the overall structure is inevitable.
[0008]
Therefore, an object of the present invention is to provide a composite mold clamping device for injection compression molding that can set a predetermined injection press stroke easily and accurately before completion of mold closing by a boost cylinder.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, a composite mold clamping device for injection compression molding according to the present invention is provided with a fixed platen and a movable platen on which a fixed die and a movable die are respectively mounted, and mounted between these two plates. A boost cylinder, a mold clamping ram and a cylinder having one end fixed to the movable plate and having a projecting screw shaft on the other end, and a movable plate and a mold clamping cylinder having one end fixed to the fixed plate. A half-nut fastening means engaged with the mold-clamping cylinder and selectively meshing with the engagement screw portion of the through-hole of the tie-bar; and a meshing position of the half-nut fastening means attached to the mold-clamping cylinder The two plates are connected and disconnected via a boost cylinder to open and close the molds, and the fastening means is positioned and fastened via a half-nut meshing position adjusting mechanism. Shi In a compound mold clamping device for clamping both molds via a solder, the compound mold clamping device further sets and adjusts the position of the mold clamping cylinder in cooperation with a half nut meshing position adjusting mechanism. It has a cylinder positioning mechanism, sets the injection press stroke between the two dies after the positioning and fastening of the half nut fastening means, and the meshing position adjusting mechanism of the half nut fastening means has an inner diameter screw whose screw shaft of the mold clamping ram A sprocket screwed into the sprocket, a holding plate fixed to the sprocket, and a holding cylinder and a holding stopper fixed to the holding plate and having respective rods and one end fixed to the mold clamping cylinder, and a half nut. A detection switch that detects the threaded part of the tie bar when it is attached, a detection switch that is attached to the cylinder positioning mechanism and detects the position of the mold clamping cylinder, And engaged with the rocket has an encoder for detecting the rotational position and rotational speed, and characterized by being configured to control the moving position of the mold clamping cylinder according to the rotation of the sprocket.
Further, the composite mold clamping apparatus for injection compression molding according to the present invention comprises a fixed platen and a movable platen to which a fixed die and a movable die are respectively mounted, a boost cylinder mounted between these two plates, and one end surface. A clamping ram and a cylinder fixed to the movable plate and having a projecting screw shaft on the other end surface, a tie bar fixed at one end to the fixed plate and the other end penetrating the movable plate and the clamping cylinder; A half-nut fastening means which is engaged with the fastening cylinder and selectively meshes with the engagement thread portion of the through portion of the tie bar; and an adjustment mechanism which is attached to the mold-clamping cylinder and adjusts the meshing position of the half-nut fastening means. The two molds are opened and closed via the boost cylinder, the molds are opened and closed, and the fastening means are positioned and fastened via the half-nut meshing position adjusting mechanism. In the compound mold clamping device for clamping, the compound mold clamping device further has a cylinder positioning mechanism for setting the position of the mold clamping cylinder in cooperation with a half nut meshing position adjusting mechanism and adjusting the position, The movable platen is stopped at a predetermined press stroke position by a boost cylinder, and after positioning and fastening the half nut fastening means at this position, an injection operation is performed.During this injection operation or after the injection operation is completed, the mold clamping cylinder is stopped. The compression is performed by the supplied pressure oil.
[0010]
In this case, the cylinder positioning mechanism can be composed of a backing plate that engages with the mold clamping cylinder, a backing plate that comes into contact with the backing plate, and a stopper that includes a feed screw that moves the back and forth.
[0011]
Also, the half nut fastening means can be configured to have an engagement play between the engagement screws of the tie bar and the half nut.
[0013]
[Action]
In the present invention, the setting of the injection press stroke is achieved after the positioning and fastening of the half nut fastening means by providing a cylinder positioning mechanism that cooperates with the half nut meshing position adjusting mechanism. Therefore, according to the present invention, it is possible to easily and accurately set a predetermined injection press stroke before the mold closing by the boost cylinder is completed.
[0014]
Further, since the mold clamping device of the present invention is formed in a complex system, it is apparent that the mold clamping device can be configured compactly and simply.
[0015]
【Example】
Next, an embodiment of a composite mold clamping apparatus for injection compression molding according to the present invention will be described in detail with reference to the accompanying drawings.
[0016]
First, it is clear that the mold clamping device according to the present invention is of a mechanically complex type, and its configuration and operation are basically the same as those of the fixed mold 10 and the movable mold shown in FIGS. A fixed plate 14 and a movable plate 16 to which the respective plates 12 are attached, a boost cylinder 20 mounted between the two plates 14 and 16, one end surface of which is fixed to an anti-movable mold mounting surface of the movable plate 16, and another end surface thereof. A mold clamping ram 24 and a mold clamping cylinder 26 having a projecting screw shaft portion 22 thereon, and a tie bar 28 having one end fixed to the fixed platen 14 and the other end penetrating the movable platen 16 and the mold clamping cylinder 26 are provided. A fastening means 34 of a half nut 32 which is engaged with the mold clamping cylinder 26 and selectively meshes with the engaging threaded portion 30 of the through portion of the tie bar 28; 34 of an adjusting mechanism 40 for adjusting the engagement position consisting configuration having respectively. In addition, the mold clamping cylinder 26 is configured to slide on an L-shaped upper surface of the movable plate 16 described later.
[0017]
In the fixed platen 14 and the movable platen 16, the fixed platen 14 has a lower portion 14 a fixed on a base 18, and the movable platen 16 has an L-shaped lower portion 16 a slidably mounted on the base 18. I have. The boost cylinder 20 has a rod 20 a having an extended end fixed to the movable platen 16. Reference numeral 32a indicates a drive unit for driving the fastening means 34 of the half nut 32.
[0018]
Further, the two plates 14, 16 are brought into and out of contact with each other via the boost cylinder 20 to open and close the dies 10, 12, and the fastening means 34 of the half nut 32 is positioned and fastened via the meshing position adjusting mechanism 40. Thereafter, the two molds 10 and 12 are configured to be clamped via the mold clamping cylinder 26.
[0019]
Therefore, in the present embodiment, in the above configuration, the composite mold clamping device further detects the position of the mold clamping cylinder 26 in cooperation with the half nut meshing position adjusting mechanism 40, and adjusts the position of the cylinder. It has a cylinder positioning mechanism 60. After the positioning and fastening of the half nut fastening means 34, the half nut meshing position adjusting mechanism 40 sets a predetermined injection press stroke L (see FIGS. 3 and 6 described later) between the dies 10 and 12. It is configured to
[0020]
Further, the cylinder positioning mechanism 60 or the half nut meshing position adjusting mechanism 40 will be described in more detail. First, the cylinder positioning mechanism 60 preferably includes a backing plate 62 that is preferably engaged with the mold clamping cylinder 26, and a backing plate 62. And a stopper 64 comprising a feed screw 64c for moving the plate 64a forward and backward by driving a motor 64b. Reference numeral 62a is a position detection switch 62a attached to the backing plate 62, and reference numeral 64d is a drive unit attached to the motor 64b.
[0021]
Further, the half nut fastening means 34 is preferably provided with an engagement play (not shown) between the engagement screw portion 30 of the tie bar 28 and the engagement screw (not shown) of the half nut 32. It is.
[0022]
The half nut meshing position adjusting mechanism 40 preferably includes a sprocket 42 having a screw at an inner diameter portion screwed to the screw shaft portion 22 of the mold clamping ram 24, a pressing plate 44 fixed to the sprocket 42, A holding cylinder 46 and a holding stopper 48 which are engaged with the holding plate 44 and whose respective rods 46a and one end portions 48a are fixed to the mold clamping cylinder 26, and an engaging screw portion of the tie bar 28 which is engaged with the half nut 32. 30, a detection switch 62a attached to the cylinder positioning mechanism 60 and detecting the position of the mold clamping cylinder 26, and an encoder 54 engaged with the sprocket 42 and detecting the rotation position and rotation speed thereof. Consists of The sprocket 42 is driven via a motor 42b provided with a chain or belt 42a and a drive section 42c. Reference numeral 46b denotes a drive unit attached to the presser cylinder 46.
[0023]
Further, in the above configuration, the moving position of the mold clamping cylinder 26 accompanying the rotation of the sprocket 42 is controlled. That is, when pressurized oil is introduced into the head-side cylinder chamber 46 c of the presser cylinder 46, the presser plate 44 moves to the left side in the drawing and comes into contact with the presser stopper 48. When the pressurized oil in the presser cylinder 46 is blocked, the mold clamp cylinder 26 moves forward or backward with the rotation of the sprocket 42 while the distance between the presser plate 44 and the mold clamp cylinder 26 remains constant.
[0024]
On the other hand, when the pressurized oil of the presser cylinder 46 is released, the presser plate 44 is also released from the mold clamping cylinder 26, so that the presser plate 44 (and the sprocket 42) moves (forwards or moves) the mold clamp cylinder 26. (Retraction) within the range of the stroke of the presser cylinder 46 (the injection press stroke described later). It is apparent that the driving units 32a, 42c, 46b, 64d and the switches 50, 54, 62a, etc. are all connected to the control unit 56, so that each of them is controlled to a predetermined state.
[0025]
Therefore, according to the composite mold clamping device of the present invention having such a configuration, the positioning adjustment of the mold clamping cylinder 26 with respect to the new mold to be applied, and the positioning and fastening of the half nut fastening means 34 which continues to this, and After the setting of the injection press stroke L, the actual molding drive is performed. All of these operation drives are automatically achieved by inputting a predetermined signal to the control unit 56.
[0026]
That is, in the positioning adjustment of the mold clamping cylinder with respect to the new mold (see FIG. 3), first, the contact plate 64a of the stopper means 64 is moved rightward in the figure, and the mold at the time of mounting the mold having the minimum mold thickness. Even at the time of contact, the contact plate 62 and the contact plate 64a of the stopper means 64 are retracted to a position where they do not contact.
[0027]
After the two dies 10 and 12 are attached, pressurized oil is supplied to the head side 46c of the holding cylinder 46 of the half nut meshing position adjusting mechanism 40, and the sprocket 42 is rotated while the holding plate 44 is pressed against the holding stopper 48. The mold clamping cylinder 26 is retracted to the left in the drawing to set a predetermined injection press stroke L between the mold clamping ram 24 and the mold clamping cylinder 26. Next, in positioning the half nut fastening means 34 and fastening the half nut 32 to the tie bar engaging screw portion 30, the two dies 10, 12 are brought into contact with each other via the boost cylinder 20, and the meshing position adjusting mechanism 40. The half nut fastening means 34 is positioned by the detection switch 50 shown in FIG. At this time, the sprocket is rotated, and the mold clamping cylinder 26 is slightly moved, and the detection switch 50 attached to the mold clamping cylinder 26 detects the engagement thread 30 so that the tie-bar engagement thread 30 can be moved halfway. The nut 32 is fastened (see FIG. 4).
[0028]
In this state (FIG. 4), the gap C is interposed in the cylinder positioning mechanism 60 because the stopper 64 is in the retracted position. After confirming the fastening of the half nut, the motor 64b is driven to move the stopper means 64 to the left in the figure to release the gap C.
[0029]
With the above setting, the gap between the backing plate 62 and the stopper means 64 is zero, and the half nut 32 maintains a state in which the half nut 32 can be securely fastened to the engagement screw portion 30 of the tie bar 28 (see FIG. 5).
[0030]
Finally, in setting the injection press stroke (see FIG. 6), the sprocket 42 shown in the engagement position adjusting mechanism 40 is rotated in the direction in which the mold clamping ram 24 and the movable platen 16 move leftward in the figure. At this time, the mold clamping cylinder 26 does not move because the contact plate 64a of the stopper means 64 and the contact plate 62 are in contact with each other. Accordingly, the rotation of the sprocket 42 causes the mold clamping ram 24 and the movable platen 16 to move to the left in the drawing, the two dies 10 and 12 are separated, and a predetermined injection press stroke L is set.
[0031]
However, at the time of the actual molding drive, the two dies 10 and 12 are closed by the boost cylinder 20, whereby the pair of the abutment plate 62 and the stopper means 64 of the mold clamping cylinder 26 is firstly set according to the result of the adjustment operation. The contact plate 64a contacts. By this contact, the output signal of the position detection switch 62a is output, and after the half nut fastening means 34 is positioned and fastened, the injection press stroke L is set (FIG. 6), and then the pressure is applied to the mold clamping cylinder (26). Oil is supplied, and the mold clamping ram 24 operates to perform injection compression molding. Therefore, it is apparent that the injection compression molding system in which the mold clamping force is generated is achieved from the state where both molds are opened by the predetermined amount.
[0032]
Thus, in the composite mold clamping device for injection compression molding of the present invention, the setting of the injection press stroke is performed after the positioning and fastening of the half nut fastening means 34, so that the setting is simple and accurate. Moreover, the change can be easily achieved. In addition, since the composite mold clamping device is mechanically configured, it has an advantage that it can be compactly and easily configured.
[0033]
The preferred embodiment of the present invention has been described above. However, the present invention is not limited to the above-described embodiment, and many design changes can be made without departing from the spirit of the present invention.
[0034]
【The invention's effect】
As described above, the composite mold clamping device for injection compression molding according to the present invention includes a fixed platen and a movable platen to which a fixed die and a movable die are respectively mounted, and a boost cylinder mounted between these two plates. A mold clamping ram and a cylinder having one end fixed to the movable plate and having a projecting screw shaft on the other end, and one end fixed to the fixed plate and the other end penetrating the movable plate and the mold clamping cylinder. A tie bar, a half nut fastening means engaged with the mold clamping cylinder and selectively meshing with the engagement thread portion of the through portion of the tie bar, and a meshing position provided on the mold clamping cylinder for adjusting the meshing position of the half nut fastening means. An adjustment mechanism is provided.The two plates are brought into and out of contact with each other via a boost cylinder to open and close the molds, and the fastening means are positioned and fastened via a half-nut meshing position adjustment mechanism. In the compound mold clamping device for clamping both dies through the mold, the compound mold clamping device further sets the position of the mold clamping cylinder in cooperation with the half nut meshing position adjusting mechanism, and adjusts the cylinder positioning for adjusting the position. After the positioning and fastening of the half nut fastening means, the injection press stroke is set between the two dies, and the meshing position adjusting mechanism of the half nut fastening means has an inner diameter part screw on the screw shaft part of the mold clamping ram. A sprocket to be screwed in, a holding plate fixed to the sprocket, and a rod and one end of the holding plate fixed to the holding plate, and a rod and one end thereof fixed to a holding cylinder and a holding stopper fixed to the mold clamping cylinder, and a half nut. And a switch attached to the cylinder positioning mechanism to detect the position of the mold clamping cylinder. And an encoder for detecting the rotation position and the number of rotations of the injection press, and configured to control the movement position of the mold clamping cylinder accompanying the rotation of the sprocket. The stroke can be set easily and accurately, and the change can be easily achieved. In addition, since this compound mold clamping device is mechanically configured, it is needless to say that it can be configured compactly and easily.
[Brief description of the drawings]
FIG. 1 is a partially cutaway overall side view showing one embodiment of a composite mold clamping device for injection compression molding according to the present invention.
FIG. 2 is a front end view of FIG. 1;
FIG. 3 is a simplified side view for explaining a setting state of a cylinder positioning mechanism and a predetermined injection press stroke L in a state where a new mold is attached to the composite mold clamping device shown in FIG.
FIG. 4 is a simplified side view for explaining a state when the half nut fastening means is positioned with respect to a new mold of the composite mold clamping device shown in FIG. 1;
FIG. 5 is a simplified side view for explaining a state when the half nut fastening means is fastened to a new mold of the composite mold clamping device shown in FIG. 1;
FIG. 6 is a simplified side view illustrating a state of the composite mold clamping device shown in FIG. 1 when an injection press stroke is set for a new mold.
[Explanation of symbols]
REFERENCE SIGNS LIST 10 fixed mold 12 movable mold 14 fixed plate 16 movable plate 18 base 20 boost cylinder 22 screw shaft portion 24 mold clamping ram 26 mold clamping cylinder 28 tie bar 30 engaging screw portion 32 half nut 32a half nut driving portion 34 half nut Fastening means 40 Half nut meshing position adjusting mechanism 42 Sprocket 42a Chain (or belt)
42b Motor 42c Motor drive unit 44 Holding plate 46 Holding cylinder 46a Rod 46b Holding cylinder drive unit 46c Head side cylinder chamber 48 Holding stopper 48a One end 50 Detection switch 52 Detection switch 54 Encoder 56 Control unit 60 Cylinder positioning mechanism 62 Positioning plate 62a Detection switch 64 Stopper means 64a Contact plate 64b Motor 64c Feed screw 64d Motor drive unit

Claims (4)

A fixed platen and a movable platen for mounting a fixed die and a movable die respectively, a boost cylinder mounted between these two plates, and one end surface fixed to the movable platen and a protruding screw shaft portion on the other end surface. A clamping ram and a cylinder, one end of which is fixed to a fixed platen, and the other end of which is a tie bar penetrating the movable platen and the clamping cylinder; A half-nut fastening means that selectively meshes with each other, and an adjustment mechanism that is attached to the mold-clamping cylinder and adjusts the meshing position of the half-nut fastening means. A combined mold clamping device that opens and closes the mold, positions and fastens the fastening means via a meshing position adjusting mechanism of the half nut, and then clamps both molds via a clamping cylinder. In addition to having a cylinder positioning mechanism for setting and adjusting the position of the mold clamping cylinder in cooperation with the half nut meshing position adjusting mechanism, the injection press is provided between the two dies after the positioning and fastening of the half nut fastening means. The stroke position is set, and the meshing position adjusting mechanism of the half nut fastening means is engaged with the sprocket in which the inner diameter screw is screwed to the screw shaft portion of the mold clamping ram, a holding plate fixed to the sprocket, and the holding plate. A press cylinder and a press stopper each of which has a rod and one end fixed to the mold clamping cylinder, a detection switch which is engaged with a half nut to detect a thread portion of the tie bar, and a mold clamping cylinder attached to the cylinder positioning mechanism. A detection switch for detecting the position of the sprocket, and an encoder which is engaged with the sprocket and detects the rotation position and the number of rotations. , Configured injection compression molding composite type mold clamping device in which to control the movement position of the mold clamping cylinder according to the rotation of the sprocket. A fixed platen and a movable platen for mounting a fixed die and a movable die respectively, a boost cylinder mounted between these two plates, and one end surface fixed to the movable platen and a protruding screw shaft portion on the other end surface. A clamping ram and a cylinder, one end of which is fixed to a fixed platen, and the other end of which is a tie bar penetrating the movable platen and the clamping cylinder; A half-nut fastening means that selectively meshes with each other, and an adjustment mechanism that is attached to the mold-clamping cylinder and adjusts the meshing position of the half-nut fastening means. A combined mold clamping device that opens and closes the mold, positions and fastens the fastening means via a meshing position adjusting mechanism of the half nut, and then clamps both molds via a clamping cylinder. In addition to setting the position of the mold clamping cylinder in cooperation with the half nut meshing position adjusting mechanism, it has a cylinder positioning mechanism for adjusting this, and the movable plate is stopped at a predetermined press stroke position by the boost cylinder, Injection compression characterized by performing an injection operation after positioning and fastening the half nut fastening means at this position, and performing compression by pressurized oil supplied to the mold clamping cylinder during this injection operation or after completion of the injection operation. Composite mold clamping device for molding. 3. The injection device according to claim 1, wherein the cylinder positioning mechanism comprises a backing plate engaged with the clamping cylinder, a backing plate in contact with the backing plate, and stopper means comprising a feed screw for moving the backing plate forward and backward. Composite mold clamping device for compression molding. The composite mold clamping device for injection compression molding according to claim 1 or 2, wherein the half nut fastening means has an engagement play space between the engagement screws of the tie bar and the half nut.

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