JP5203625B2 - Attitude control device for moving mold in injection molding machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an attitude control device for a movable mold which highly accurately and automatically performs an alignment of the moving mold relative to a fixed mold. <P>SOLUTION: Alignment plates 26, 28 are disposed between a moving mold mounting plate 24 and a moving die plate MVP. A piezoelectric element PE composing a piezoelectric element unit 40 abuts to the upper end surface of the alignment plate, and the piezoelectric element is displaced by applying a predetermined voltage to be able to displace the alignment plate downward. The attitude control device is provided with a light receiving part 34 and a mark 38 for composing an attitude measuring means. The attitude control device is constituted so that a number of CCDs (charge coupled device) used for a digital still camera or the like are disposed in a matrix shape as a unit pixel on the light receiving area of the light receiving part, and the positions of respective CCDs have memories corresponding to the addresses in a control device. <P>COPYRIGHT: (C)2009,JPO&amp;INPIT

Description

  The present invention relates to attitude control of a movable mold in an injection molding machine, and more particularly to an attitude control apparatus for a movable mold that automatically and accurately performs alignment of the movable mold with respect to a fixed mold.

  A pair of fixed molds and movable molds used in an injection molding machine are usually designed on the assumption that molding is performed in a state in which their axial centers coincide. However, these pair of fixed molds and movable molds are mounted on the fixed die plate and the movable die plate, respectively, on the injection molding machine. When the mold is closed or clamped, the movable mold is attached. The actual posture of the movable mold with respect to the fixed mold does not necessarily match the state intended at the time of designing the injection molding machine due to accuracy, dust on the mounting surface, deformation of the movable die plate due to stress during molding, and the like. As the demand for sophistication of the molding accuracy of molded products increases, it is required to match the axial centers of a pair of fixed molds and moving molds as much as possible when they are attached to an injection molding machine.

  In order to meet these requirements, mold clamping is possible among the joints between the piston and tie bar, the support plate and tie bar, and the movable die plate and movable die plate support of the mold clamping hydraulic cylinder so that high-precision mold alignment is possible. There has been disclosed one having an alignment mechanism at at least one joint so that both molds are sometimes aligned. (Patent Document 1)

  Moreover, when a movable mold is closed while the misalignment is corrected by the mold positioning apparatus, a mold mounting apparatus that does not apply excessive force to the mold positioning apparatus is disclosed in Patent Document 2 as a moving die plate. A mold mounting device having a structure in which a movable mold is mounted via an alignment face plate, and a mold mounting device in which a twist acting on the movable mold is not borne by the mold positioning device, and a mold mounting device in which the movable mold is automatically aligned are provided. It is disclosed.

In paragraphs 0002 to 0004 of Patent Document 2,
“A mold clamping device of an injection molding machine includes at least a fixed platen for attaching a fixed mold and a movable platen for attaching a movable mold, and the mold is opened and closed by moving the movable platen back and forth with respect to the fixed platen. Then, the resin material is filled from the injection device into the cavity formed between the closed movable mold and the fixed mold, and the molded product is molded.
When the molding operation is started, the resin material melted at a high temperature is injected into the mold every molding cycle, and the mold temperature rises. Therefore, the mold itself is cooled by circulating cooling water through the mold (temperature control) and a heat insulating plate is inserted between the mold and the platen to stabilize the temperature of the mold itself and the platen. It is usually done. However, the temperature of the platen and the mold is different between the state when the mold is attached and the state after the operation is started, and the temperature of both changes with the passage of time. This misalignment is caused by a difference in the amount of thermal displacement due to a difference in the structure and material of the platen and mold, but also occurs when the ambient temperature changes. In this way, in the mold clamping device, the center position of the platen or the mold is often slightly misaligned.
In order to correct the slight misalignment of the mold, a mold positioning device is usually built in the mold. In the mold positioning device, for example, a guide pin is planted on the movable mold side, a guide bush is inserted into the fixed mold, or a taper-shaped guide convex part and a concave part are provided. It is. When such a mold positioning device is inserted and positioned to each other, the mold is closed with its center aligned. However, if the molding operation is continued while correcting the misalignment as described above with the mold firmly fixed to the platen, for example, in the combination of the guide pin and the guide bush, the guide pin is always separated from the guide bush. The guide pin and the guide bush are worn early. As a result, the mold positioning device between the movable mold and the fixed mold becomes sweet, the centers of both molds are misaligned, and the centers of the two opposing surfaces of the molded product are misaligned. This is a cause of greatly degrading the quality of a precision molded product, for example, a fine connector or a lens to be precisely molded. (Quotation 1)
It is described.

Furthermore, in paragraph 0010 of Patent Document 2,
“To achieve the above-described object, a mold mounting apparatus for an injection molding machine according to claim 1 includes a movable mold (12) positioned on a fixed mold (11) by a mold positioning apparatus (20). In the mold mounting apparatus of the injection molding machine to be mounted on the movable platen (2), aligning face plates (31), (32), (33) for mounting the movable mold (12) are aligned with the aligning springs (42), ( 142), (242), (52), (152), (252), (301) are pre-loaded in a balanced state in the horizontal and vertical directions and are supported. " 2)
It is described.

Furthermore, in paragraphs 0030 and 0032 of Patent Document 2, as a mechanism having a twist preventing function,
As shown in FIGS. 6 and 8, the aligning face plate 31 is supported as follows by the horizontal / vertical guide unit 180. The horizontal / vertical guide unit 180 includes a vertical positioning pin 181, a horizontal positioning pin 182, and a movable block. 183, which are arranged above and below the aligning face plate 31. Vertical positioning pins 181 are implanted vertically at both upper and lower end face angles of the aligning face plate 31, and the horizontal positioning pins 182 are fixed to the bracket 151. A movable block 183 is inserted between the pins 181 and 182 so that the vertical positioning pin 181 and the horizontal positioning pin 182 are inserted at right angles at the torsional position. The aligning face plate 31 is guided so that the gap between the aligning face plate 31 and the movable platen 2 is about 0.01 mm. It is preferable to insert a gun metal bush or a ball bush into the movable block 183 so that the movement of 82 is smooth.The horizontal / vertical guide means 180 is not limited to the illustrated configuration, and the horizontal and vertical directions are The arrangement may be changed.
In such a mold mounting apparatus of the second embodiment, the movable block 183 is movable in the horizontal direction to the horizontal positioning pin 182, and the vertical positioning pin 181, that is, the aligning face plate 31 is moved in the vertical direction to the movable block 183. Is possible. Therefore, the aligning face plate 31 is guided on the movable platen 2 so as to be simultaneously movable in both the horizontal direction and the vertical direction without being constrained by the center position of the movable platen 2. Further, even if the mold is twisted when the mold is closed, the horizontal / vertical guide means 180 can support this load. This is because the aligning face plate 31 is simultaneously supported in the horizontal direction and the vertical direction by the positioning pins 181 and 182 and the movable block 183. Since the horizontal / vertical guide means 180 is disposed at a position away from the center of the aligning face plate 31, this load is not excessive. (Quotation 3)
It is described.

Moreover, even if the movable mold is slightly misaligned with respect to the fixed mold, a mold mounting device that can accurately and easily align the position of the movable mold is provided. Patent Document 3 discloses a structure having fine adjustment mechanisms each including three alignment face plates as a mold mounting apparatus for mounting a movable mold.

In paragraph 0009 of Patent Document 3,
“The aligning face plate of the movable platen to which the movable mold is fixed can be finely adjusted in two directions orthogonal to each other on a plane orthogonal to the central axis so that the central axis of the fixed mold and the central axis of the movable mold are An injection molding machine that can perform high-precision and efficient positioning of the center axis of the movable mold and the fixed mold, that is, by aligning the center axis and making fine adjustments in the rotational direction. In addition, it is possible to quantify complicated positioning work by providing a display device that displays a minute movement in each of two directions and a rotational direction on a plane orthogonal to the central axis. It is an object to provide a mold mounting apparatus for an injection molding machine that can be performed quickly while confirming the situation. "(Citation 4)
It is described.

Furthermore, paragraphs 0035 to 0038 of Patent Document 3 include
“The fine adjustment amount of the first to third aligning face plates 310, 320, and 330 is quantitatively determined by providing a position display device 60 as shown in FIGS. 1, 2, 6, and 7. As shown in Fig. 9, the position display device 60 has the same configuration provided in parallel with the direction of fine adjustment of each alignment face plate, as shown in Fig. 9. FIG. 9 shows a position display device 60 provided in the first fine adjustment mechanism 31 as a representative example.
The position display device 60 is preferably a length measuring device such as a dial gauge 61, for example. A measuring member 63 of the dial gauge 61 is disposed on a lateral holding member 312 used as a bracket to be fixed to the movable platen 2 side so as to contact the end surface of the aligning face plate 31, and the movable platen 2 of the first aligning face plate 310 is arranged. The position relative to is displayed on the display unit.
The dial gauge 61 preferably has a minimum scale of about 1 or 2 μm and a maximum scale of about ± 0.5 mm. Then, the gap between the aligning face plates 310 and 320 and the holding members 312 and 322 or the gap between the projecting portion 334 of the third aligning face plate 330 and the adjusting member 72 is adjusted to 0.5 mm as illustrated. Sometimes, the dial gauge 61 is adjusted so that the scale indicates 0 and is fixed by the set bolt 64. Therefore, the fine adjustment allowance is ± 0.5 mm. When the aligning face plate is located at a gap exceeding this range, the position is naturally not measured. However, the object of the present invention is to precisely adjust the mold position so that it is ± 0.5 mm. It is sufficient if measurement is possible. The gap 0.5 mm can be set to a maximum of about 1 mm so that the assembly is facilitated when the alignment face plate is first set between the holding members. The scale may be adjusted to show 0 at a position of 1 mm, and a position in a range of about ± 0.5 mm may be measured based on the position. When the position display device 60 is not provided in the mold clamping device, a hand-held dial gauge is attached to the movable platen 2, and the first to third aligning face plates 310, 320, 330 or the movable mold are attached. Check 12 position.
Next, a procedure for adjusting the mounting of the mold mounting apparatus having the above-described configuration will be described. The first aligning face plate 310 is supported on the movable platen 2 by the lateral holding members 312 and 313 and the keys 314 and 315 fixed to the movable platen 2 first. The second aligning face plate 320 is supported on the first aligning face plate 310 by the longitudinal guide members 322 and 323 and the keys 324 and 325 previously fixed to the first aligning face plate 310. Further, the third aligning face plate 330 is inserted into the cylindrical shaft member 326 at the center position with the protruding portion 334 positioned between the adjusting members 72 or 73 fixed to the second aligning face plate 320 in advance. Then, it is supported on the second alignment face plate 320, and these face plates are temporarily fixed to the fixed platen 2 by temporary fixing bolts 4. Next, the three aligning face plates 310 to 330 are in a state where the indication scales of the respective position display devices 60 indicate 0, that is, each aligning face plate has no gap between the guide member and the adjusting member. These positions are finely adjusted by the push bolts 51 of the respective aligning devices so as to be 5 mm, and the centering is performed. In this state, the lock bolts 6 are fixed.
In this way, when the three aligning face plates are centered in the respective directions and incorporated in the movable platen 2, each component member of the mold mounting device is aligned with the center of the platen. The shape and dimensions are preliminarily formed within predetermined tolerances. (Quotation 5)
It is described.

JP-A-4-348916 JP2000-309037 JP2001-47777

  In patent document 1, it is related to making the axial center of a movable metal mold | die and a fixed metal mold | die agree | coinciding, The problem resulting from the structure of a tie bar is extracted among them, and a tie bar and a movable die plate support body are extracted. The gap is reduced, the inclination of the moving die plate is reduced, and as a result, high-precision mold alignment is possible, and the attitude of the moving mold itself relative to the fixed mold is directly detected and corrected. is not.

  In Patent Document 2, as shown in FIGS. 1 and 2, a centering face plate 31 is provided between the movable die plate, that is, the movable platen 2 and the movable mold mounting plate 14. For this purpose, a horizontal balance guide means 40, a vertical balance guide means 50, and a position display means 70 are provided. For adjustment movement, as shown in FIG. 4, a push bolt 61 is provided, and a spring 52 for applying pressure is provided on the opposite side. Furthermore, as shown in FIG. 6, horizontal and vertical guide means 180 are provided to prevent twisting as described in the above cited references 1 and 3, and the movable mold by the mold positioning device 20 and The centering of the fixed mold is performed normally.

  However, in this patent document 2, the horizontal and vertical displacements of the movable mold are always displayed on the position display means, and the push bolt is adjusted when the value is displaced from zero. In the adjustment, the operation of the injection molding machine must be interrupted.

  In Patent Document 3, three alignment face plates 310, 320, and 330 are provided between the movable platen 2 and the movable mold 12, and the alignment face plates 310 and 320 are for horizontal and vertical directions, respectively. The face plate 330 is for rotation, and the fine adjustment mechanisms 31, 32, and 33 of the aligning face plates are composed of a push bolt and a preload spring that are substantially the same as in Patent Document 2, and are described in Citation 5. As shown in the figure, it has a dial gauge as a position display device, and the adjustment work is performed while the operator looks at the display device, and the operation of the injection molding machine must be interrupted at the time of adjustment. I must.

  Further, both Patent Documents 2 and 3 are described as centering by the guide pins 21 and the guide bushes 22 constituting the mold positioning means 20, but according to the knowledge of the present inventors, such In some cases, a pair of molds that do not include mold positioning means using guide bushes and guide pins is used. Even if such a guide bush and guide pin are provided, they perform a temporary guide function during the mold closing operation, and both are loosely engaged with each other in the order of several tens of microns. Even if the guide bush and the guide pin are normally fitted, the axes of the movable mold and the fixed mold do not coincide with each other with high accuracy.

  As a result of diligent examination of the various problems described above, the present inventors have automatically measured the attitude of the moving mold with respect to the fixed mold mounted on the injection molding machine, and used the detected signal to It has been found that the above problems can be basically solved by automatically adjusting the attitude of the moving mold through a fine adjustment mechanism equipped with elements.

  Accordingly, an object of the present invention is to provide an attitude control device for a moving mold that automatically and accurately performs the alignment of the moving mold with respect to the fixed mold.

In order to achieve the above object, an attitude control device for a movable mold in an injection molding machine according to the present invention comprises:
An attitude control device that controls a movable mold mounted and fixed on a moving die plate to a fixed mold mounted and fixed on a fixed die plate of an injection molding machine.
A plurality of alignment plates interposed between the mold mounting plate for fixing and holding the movable mold and the movable die plate;
Measuring means for measuring the attitude of the moving mold with respect to the fixed mold;
A plurality of piezoelectric element units for displacing each alignment plate relative to the movable die plate in a predetermined axial direction;
Control means for generating an electrical signal for driving each piezoelectric element unit based on the detection signal obtained by the measurement means;
It is characterized by comprising.

In that case, the measuring means is arranged in the vicinity of the fixed mold or in the vicinity of the movable mold, and in the vicinity of the movable mold or in the vicinity of the fixed mold facing the mark. And the measuring means is capable of measuring at least two orthogonal displacement amounts on the movable mold plane.
In this case, the light receiving area of the light receiving unit is formed of a CCD element group, and the light receiving and non-light receiving states of each CCD element are held in a first memory having an address corresponding to the position of the light receiving area of the CCD element. It can be configured as follows.
Furthermore, the control means has a second memory for presetting first data corresponding to a reference state of the movable mold with respect to the fixed mold in each axial direction of a plurality of coordinate axes defining the attitude of the movable mold; Generating the component data in each coordinate axis direction from the measured detection signal, and further forming the corrected displacement amount commanded to each piezoelectric element unit between the component data and the first data in each coordinate axis direction. An arithmetic unit that calculates a difference, a piezoelectric element characteristic unit that defines a relationship between an input voltage supplied to the piezoelectric element of each of the piezoelectric element units and a displacement amount thereof, and the correction displacement amount is accommodated through the characteristic unit. A displacement-voltage conversion unit that specifies an input voltage and generates the electrical signal can be configured.
Further, in this case, the plurality of alignment plates include a pair of XY tables configured to be allowed to move in directions orthogonal to each other in a plane perpendicular to the moving direction of the moving die plate. Can do.
Further, in this case, the plurality of alignment plates may include a rotary table configured to allow a predetermined range of rotation within a plane perpendicular to the moving direction of the movable die plate.

  According to the present invention, the moving mold is automatically measured at an appropriate timing during the operation of the injection molding machine, and the moving mold is provided via the fine adjustment mechanism provided with the piezoelectric element by the electric signal generated from the detection signal. It is possible to automatically adjust the posture of the fixed mold.

Hereinafter, an example based on an embodiment of the invention will be described in detail with reference to the drawings.
FIG. 1 is a block diagram for explaining the main functions of the attitude control apparatus 10 for a movable mold according to the present invention. In the figure, reference numeral 10a indicates a desired posture of the moving mold, that is, the moving mold in a state where the axis of the moving mold coincides with the axis of the fixed mold (hereinafter referred to as a reference state in the present invention). Component data in each axial direction of coordinate axes that define the posture, for example, a setting unit that sets a value of zero, reference numeral 10b is a measuring unit that measures the posture of the moving mold during operation of the injection molding machine and generates a detection signal, Reference numeral 10c generates a component in each axial direction from the detection signal, and calculates a difference from the component data corresponding to the attitude of the moving mold in the reference state from the setting unit 10a. Reference numeral 10d is This is a fine adjustment mechanism having a piezoelectric element driving unit 10e corresponding to each axial direction.

  FIG. 2 is a side view of a mold clamping device portion of a horizontal injection molding machine to which the present invention is applied. In FIG. 2, a fixed die plate FXP is erected and fixed to the right end portion of the base frame 20. On the other hand, a movable die plate MVP is provided on the left end side of the base frame 20 so as to be movable in the left-right direction (hereinafter referred to as Z direction) in the figure via a linear guide 22. A tie bar TB passes through the corners of the movable die plate MVP and the fixed die plate FXP. The movable die plate MVP is guided by the tie bar TB and moved in the Z direction by a moving means (not shown), and a predetermined mold closing position. And is clamped by a known clamping mechanism 50. Reference numeral 24 denotes a moving mold mounting plate for mounting and fixing the moving mold MVD at a predetermined position, and alignment plates 26 and 28 are arranged between the moving die plate MVP.

A fixed die FXD is attached and fixed to the fixed die plate FXP via an attachment plate 32. Reference sign CL indicates the central axis of the moving mold MVD and the fixed mold FXD in the Z direction. During the operation of the injection molding machine, it is necessary for the non-defective molding that the axes of the two coincide.
The alignment plate 26 is attached to be movable within a predetermined range in the Y direction that is the vertical direction on the right end surface of the movable die plate MVP. Reference numeral 26a is a V-shaped guide groove formed in the Y direction of the movable die plate MVP, and a sliding portion 26b of the alignment plate 26 is slidably provided in the guide groove 26a. Yes. Reference numeral 30 is a frame attached to the movable die plate MVD, and faces the flange 26c of the alignment plate 26 with a predetermined gap as shown in the figure. This predetermined interval is about several tens of microns. This piece 30 prevents the alignment plate 26 from being detached from the movable die plate MVD. Reference numeral spr is a spring that applies a preload upward to the alignment plate 26. Although not shown, the piece 30 is also provided at an appropriate position on the upper part or the side part of the alignment plate 26.

Reference numeral 40 denotes a piezoelectric element unit having a piezoelectric element PE, and the lower end portion of the piezoelectric element PE is in contact with the upper end surface of the alignment plate 26. By applying a predetermined voltage to the piezoelectric element PE, the piezoelectric element PE is displaced, and the alignment plate 26 can be displaced downward.
This piezoelectric element PE utilizes the piezoelectric effect, has good responsiveness, large load resistance, and high energy efficiency.For example, when positioning with submicron accuracy, it withstands a load of several tons, Displacement of several hundred microns can be performed instantaneously. As a direct actuator that is generally used, there is one in which stacked piezo stacks are housed in a case.

  Reference numeral 28 denotes another alignment plate which is mounted on the right end surface of the alignment plate 26 so as to be movable in the X direction perpendicular to the Y direction. Reference numeral 28a is a V-shaped guide groove formed in the X direction on the mounting surface of the alignment plate 26, and the V-shaped sliding portion 28b of the alignment plate 28 faces the guide groove 28a. It is slidably provided. Reference numeral 42 denotes a detachment prevention piece for the alignment plate 28, and is opposed to the flange 28 c provided on the alignment plate 28, similarly to the piece 40. Reference numeral 40a denotes a piezoelectric element unit similar to the piezoelectric element unit 40, and in the drawing, the piezoelectric element PE is attached so as to push the front surface of the alignment plate 28 in a direction perpendicular to the paper surface.

  Reference numeral 34 is a light receiving portion constituting the posture measuring means attached to the movable mold attachment plate 24, and reference numeral 38 is a mark provided on the attachment plate 32 on the fixed die plate FXD side. In the light receiving area of the light receiving unit 34, a large number of CCDs (electrical coupling elements) used in a digital still camera or the like are arranged as a unit pixel in a matrix, and each CCD has a memory corresponding to an address. It is configured. The attachment positions of the light receiving unit 34 and the mark 38 may be reversed.

In FIG. 2, the alignment plate 28 and the moving mold mounting plate 24 are fixedly coupled together, and there is no mechanism for measuring rotation as the attitude of the moving mold MVD.
FIG. 3 is a diagram illustrating an example in the case of handling rotation with respect to the reference central axis CL in the posture of the moving mold MVD. In the figure, a stem 28f is integrally formed at the center of the alignment plate 28, and the movable mold mounting plate 24 is attached to be rotatable around the stem 28f. Reference numeral 44 is a separation preventing piece facing the flange 28e.

  FIG. 4 is a diagram showing the arrangement of the piezoelectric element units as viewed from the direction of the arrow in FIG. In the drawing, one end of the piezoelectric element PE of the piezoelectric element unit 40b fixed on the movable mold mounting plate 24 is in contact with the side surface SF1 formed on the upper side of the alignment plate 28. Further, one end of a spring spr provided on the support 46 fixed on the movable mold mounting plate 24 is brought into contact with the side surface SF2 formed on the lower side of the alignment plate 28, and preload is applied.

  FIG. 5 is a schematic diagram illustrating the light receiving region. In the figure, reference numeral A indicates a light receiving region of the light receiving unit 34. In this light receiving area A, coordinate axes x and y in the direction perpendicular to the axis CL of the injection molding machine are defined. A black portion B of the pixel in the vicinity of the origin of the coordinate axes x and y is a case where the mark 38 is a circular mark, and is a light reception image when the circular mark is received. Reference symbol C indicates a portion of the light receiving region A that is not receiving light. In FIG. 5, as a schematic diagram for explanation, the outline of the received light image B corresponding to the circular mark is not shown in a complete circle because the grid corresponding to each CCD element is displayed. It is possible to arrange a fine CCD element having several million to 10 million pixels or more in the area, and the outer shape of the received light image B can be regarded as a substantially perfect circle. In the case of FIG. 5, the amount of displacement in the x and y directions can be determined by obtaining the black pixel portion B, that is, the barycentric position of the region in the light receiving state. As a method of calculating the center of gravity position, for example, assuming that the black pixel portion in the figure has a weight of 1, the sum of the coordinate values of the black pixels in both the x coordinate and the y coordinate is divided by the total number of black pixels.

FIG. 6 is a schematic diagram of a light receiving region when a cross-shaped cross mark is used as the mark 38, and a black portion is a light reception image of the cross mark. This figure illustrates the case where the moving mold MVD is rotationally displaced by θ _{0 with} respect to the fixed mold FXD, and the position of the center of gravity is xg in the X direction and yg in the Y direction.
The rotational displacement shown in FIG. 6 is obtained by performing polar coordinate development ((x, y) → (r, θ)) with the center of gravity (xg, yg) as the origin, and the cross image data in the reference state with zero tilt angle. The correlation with the cross image data when θ is changed is calculated, and θ when they are the best match is used as the inclination angle. FIG. 7 is a graph when FIG. 6 is expanded in polar coordinates. The horizontal axis is θ, and the vertical axis is r. 7 and 8 are graphs assuming that the number of pixels is larger than that in FIG. 6, and the influence of quantization is reduced.
The waveform W in FIG. 8 is obtained by calculating the correlation by changing the rotation angle between the graph in FIG. 7 and the polar image development graph of the cross image in the reference state with the zero tilt angle. Is the correlation value F. The correlation value F1 is almost the maximum at the angle of θ ₀ , indicating that the cross image of the cross mark is tilted counterclockwise by θ ₀ with respect to the horizontal.

  In the above description, an example in which the image of the mark is optically measured as the posture measuring unit of the moving mold has been described. However, as shown in the lower right part of FIG. 3, the Z direction moving unit 100b and the X direction moving unit 100c are used. The stylus part 100a provided at the tip of the three-dimensional coordinate measuring apparatus 100 including the Y-direction moving part 100d is provided at an appropriate position on the side surface of the moving mold MVD and brought into contact with the reference surfaces S1 and S2. It is also possible to read the coordinate values in the X, Y, and Z directions of the three-dimensional coordinate measuring apparatus 100 when the contact signal is generated as the movement amount of each moving unit, and detect the displacement amount. For example, if there is a difference in the coordinate values in the X direction when contacting the reference surfaces S1 and S2 on the side surface SF on the near side of the moving mold MVD, it can be seen that the moving mold MVD is rotationally displaced. Moreover, even if there is no difference, if there is a difference compared with the coordinate value in the reference state, it can be seen that the moving mold MVD is displaced in the X direction. In a similar relationship, it is also possible to perform using a reference surface (not shown) provided on the upper surface UF of the moving mold MVD. Furthermore, by measuring on the other reference surface S3, the direction and amount of inclination of the side surface SF can be calculated by performing simple calculations. 2 and 3, the piezoelectric element unit is provided for correction driving with respect to X, Y and rotation, and the arrangement of the piezoelectric element unit for correction driving with respect to the inclination is not illustrated.

  Since the attitude control device for a movable mold according to the present invention includes the above-described configuration, preferably a measuring means for measuring the image of the mark, the measurement is performed instantaneously, and then the piezoelectric element is subjected to electrical calculation processing. A drive command is generated instantaneously, and each alignment plate is corrected based on the command, so that the operator does not need to intervene in the correction operation and the operation of the injection molding machine may be interrupted. I don't need it. In addition, the measurement can be performed instantaneously and at any time in any state when the pair of moving molds and fixed molds are open, closed, and clamped. Useful for analyzing trends and causes of relative displacement of a moving mold with respect to a fixed mold by comparing measured values when molding is actually performed with measured values when the mold is opened and closed. It is.

  Although the preferred embodiments of the present invention have been described with reference to the drawings, those skilled in the art can implement various modifications within the scope of the technical ideas described in the claims. For example, although the guide grooves 26a and 28a have been described as being V-shaped in FIG. 2, the reverse V-shaped grooves can prevent separation, and the pieces 30 and 42 are unnecessary. Further, the mark is not limited to a circular shape or a cross shape. For example, if rotational displacement and displacement in the X and Y directions exist at the same time, specify the angle at which the correlation with the reference state is periodically maximized even if it is a square shape or a shape other than a circle, such as a polygon. If possible, the angle can be determined as rotational displacement.

It is a functional block diagram explaining the main functions of the attitude | position control apparatus by this invention. It is a side view of the mold clamping apparatus part of the horizontal type injection molding machine to which this invention is applied. It is a schematic diagram explaining the light reception area | region in the case of handling rotation with respect to a reference | standard center axis | shaft among the attitude | positions of a moving mold. It is a figure which shows arrangement | positioning of the piezoelectric element unit seen from the arrow A of FIG. It is a schematic diagram explaining the light reception area | region at the time of using a circular mark. FIG. 6 is a schematic diagram of a light receiving region where both a rotational displacement and a displacement in the X and Y directions exist when a cross-shaped cross mark is used. FIG. 7 is a graph when FIG. 6 is expanded in polar coordinates. It is a graph which shows a correlation function when a horizontal axis is rotational displacement (theta) and a vertical axis | shaft is made into the correlation value F. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Posture control apparatus 20 Base frame 22 Linear guide 24 Moving mold attachment plate 26, 28 Alignment plates 30, 42, 44 Frame 32 Attachment plate 34 Light receiving part 38 Mark 40 Piezoelectric element unit 46 Spring support body 50 Clamp mechanism 100 Three-dimensional Coordinate measuring device FXD Fixed mold FXP Fixed die plate MVD Moving mold MVP Moving die plate PE Piezoelectric element spr Spring TB Tie bar

Claims (5)

An attitude control device that controls a movable mold mounted and fixed on a moving die plate to a fixed mold mounted and fixed on a fixed die plate of an injection molding machine.
A plurality of alignment plates interposed between the mold mounting plate for fixing and holding the movable mold and the movable die plate;
Measuring means for measuring the attitude of the moving mold with respect to the fixed mold;
A plurality of piezoelectric element units for displacing each alignment plate relative to the movable die plate in a predetermined axial direction;
Control means for generating an electrical signal for driving each piezoelectric element unit based on the detection signal obtained by the measurement means;
Equipped with a,
The measuring means includes a mark provided in the vicinity of the fixed mold or the vicinity of the movable mold, and a light reception disposed in the vicinity of the movable mold or the vicinity of the fixed mold so as to face the mark. And
With
The movable mold attitude control apparatus in an injection molding machine, wherein the measuring means is capable of measuring at least two orthogonal displacement amounts on the movable mold plane . The light receiving area of the light receiving section is formed of a CCD element group, and the light receiving and non-light receiving states of each CCD element are stored and held in a first memory having an address corresponding to the position of the light receiving area of the CCD element. The apparatus for controlling the attitude of a moving mold in an injection molding machine according to claim 1 , wherein: The control means is measured with a second memory that presets first data corresponding to a reference state of the movable mold with respect to the fixed mold in each axial direction of a plurality of coordinate axes defining the attitude of the movable mold. Further, component data in each coordinate axis direction is generated from the detection signal, and a difference between each component data and the first data in each coordinate axis direction is calculated in order to form a corrected displacement amount commanded to each piezoelectric element unit. An operation unit that performs the operation, a piezoelectric element characteristic unit that defines a relationship between an input voltage supplied to the piezoelectric element of each piezoelectric element unit and a displacement amount thereof, and an input voltage corresponding to the corrected displacement amount via the characteristic unit. The apparatus for controlling a posture of a moving mold in an injection molding machine according to any one of claims 1 to 2, further comprising: a displacement-voltage conversion unit that identifies and generates the electric signal. The plurality of alignment plates include a pair of XY tables configured to be allowed to move in directions orthogonal to each other in a plane perpendicular to the moving direction of the moving die plate. 4. An attitude control device for a moving mold in an injection molding machine according to any one of 1 to 3 . The plurality of alignment plate, any one of claims 1 to 4, characterized in that it comprises a rotary table that rotates in a predetermined range in the direction of movement perpendicular to the plane of the movable die plate is configured to be allowed The posture control apparatus of the moving mold in the injection molding machine described in 1.

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