TW201006655A - Mold clamping apparatus - Google Patents

Abstract

Disclosed is a mold clamping apparatus that uses an electromagnet to effect a mold clamping force. The apparatus is equipped with an electromagnet holding member that holds the electromagnet, an attraction member having a first attraction surface, which is attracted by said electromagnet, and a contact-prevention part to prevent full-surface contact of the magnetic materials between the first attraction surface and a second magnetic attraction surface opposite said attraction surface on said electromagnet holding member. In this way, it is possible to provide a mold clamping apparatus that can facilitate separation of the members attracted by the residual magnetic field of the electromagnet used for generating the mold clamping force.

Description

201006655 VI. Description of the Invention: [Technical Field to Which the Invention Is Applicable] In particular, the present invention relates to a mold clamping device in which a clamping force is applied to an electromagnet of a clamping device. [Prior Art] In the injection molding machine, resin is injected from the injection nozzle of the injection device to be filled in the solid

„ With the cavity open space between the movable mold and the movable mold, it is solidified to obtain a molded product. ^ ^ ^ ... silly, the clamping device is configured to make the movable mold relatively smaller than the fixed ^ λ 疋 疋 mold Moving, mold closing, mold clamping, and mold opening. In the mold clamping device, the right-handed mm t has an oil-type clamping device driven by supplying oil to the hydraulic cylinder and driven by an electric motor. The electric type clamping device, the electric type clamping device is more than (4) due to the control _ 陧 陧 陧 ' 且 且 且 且 且 且 且 且 且 且 且 且 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 The thrust is generated, which is amplified by the financial mechanism, and generates a large clamping force. μ Therefore, in the above-described electric type clamping device, the characteristic of the toggle mechanism is changed due to the use of the elbow mechanism. The clamping force is difficult, the reactivity and the stability are poor, and the clamping force cannot be controlled during the forming. Here, a clamping device is provided, and the thrust generated by the ball screw is used as a direct clamping force. Due to the torque of the motor, the clamping force In contrast, the clamping force in forming can be controlled. ... And in the conventional clamping device, the load-bearing resistance of the ball screw is reduced, not only cannot produce a large clamping force, but also due to the torque generated by the motor 201006655. 〇rqueripple), the clamping force is changed. In addition, in order to produce the clamping force, it is necessary to supply current to the motor frequently. Since the pin of the motor consumes more power and generates more heat, the rated turn of the motor becomes larger, which will improve the clamping mode. The cost of the device is as follows: In the mold opening and closing operation, a linear motor is used, and a mold clamping device utilizing the adsorption force of the electromagnet is reviewed in the mold clamping operation (for example, Patent Document). The clamping force must form a proper gap between the member that holds the electromagnet (for example, the rear plate) and the member that is attracted by the electromagnet (for example, between the adsorption illusions). [Patent Document 1] International Publication No. 05/ 904052 [Invention] [Problems to be Solved by the Invention] However, the size of the gap is adjusted corresponding to the size of the modulo, and in the event of an adjustment error, During the clamping process, it is ensured that the two components are attached and may be adsorbed with a relatively strong force. This lightning magnetic mountain is used to stop the supply of current 5 electromagnets, and the residual magnetic field is detected and separated from a component. Very much, there is a problem that hinders the smooth progress of the operation. In view of the above, the object of the present invention is to provide - by the sputum sputum, the λα temple · ^ ^ Μ Μ. Μ > away. The member is easy to be divided. [Means for Solving the Problem In order to solve the above problem, the present invention uses an electromagnet to apply a clamping force 201006655, comprising: an electromagnet holding member that holds the electromagnet; and an adsorption member that is adsorbed by the electromagnet The first adsorption surface; the contact preventing portion prevents total contact between the magnetic bodies between the second adsorption faces facing the adsorption surface in the first adsorption surface and the electromagnet holding member. [Effects of the Invention] According to the present invention, there is provided a mold clamping device which is capable of easily separating a member which is adsorbed by a residual magnetic field of an electromagnet which generates a clamping force. [Embodiment] An embodiment of the present invention will be described with reference to the drawings. First, a mold clamping device of an injection molding machine to which the present invention is applied will be described with reference to Figs. 1 and 2 . Fig. 1 is a side view showing a state in which the mold device and the mold clamping device of the first embodiment are closed. Fig. 2 is a side view showing a state in which the mold device and the mold clamping device are opened at the time of the first embodiment. The mold clamping device 10 of Figs. 1 and 2 is supported by a guide Gd formed by two rails provided on the frame Fr of the injection molding machine. The solid/system is placed on the guide Gd, and is fixed to the frame Fr and the guide Gd. The fixed plate 11 is disposed at a predetermined interval and disposed opposite to the fixed plate u: the rear plate 13 of the electromagnet holding member. Between the fixed plate U and the rear plate 13: Four connecting rods 14 (only two are shown) are provided as connecting members. The movable plate 12 is disposed along the link 14 in the state in which the fixed plate 11 is opposed to the fixed plate 11 so as to be movable forward and backward in the mold direction (movable in the left-right direction in the drawing). Because: the guide hole penetrating through the connecting rod 14 is formed on the movable plate 12 (not shown, the direction of movement of the mobile plate 12 is not shown and is 'in this specification, the moving direction of the mold opening and closing direction is called Ma Liangping direction, vertical In the vertical direction of the movable plate 12. (Not =: 4 connected: i end (figure (4) right end) forms the first threaded portion 14 is fixed to the fixed plate u by screwing the nut nl to the first The outer diameter of the guide post smaller than the link 14, 2': the junction is formed at the rear end portion of each link 14 (the left end portion in the drawing). The rear end surface (the left end surface in the drawing) of the rear plate W of the body is rearward. The second screw portion (not shown) is formed in the vicinity of the rear end surface of the rear plate 13 of the guide post 21, and the fixing plate 11 and the rear plate 13 are screwed and fixed to the second portion by the nut. Although the guide post 21 and the connecting rod 14 are integrally formed, the guide 21 may be formed separately from the connecting rod 14. The fixed mold 15 and the movable mold 16 are respectively fixed to the fixed plate u and the movable plate 12. The fixed mold 15 and the movable mold 15 are movable. The mold 16 constitutes the mold device 19. The movable mold 16 is moved relative to the fixed mold by the advance and retreat of the movable panel 12. The mold is closed, mold-locked, and opened. Further, when the mold is clamped, a cavity is formed between the fixed mold 15 and the movable mold 16, and a resin as a molding material is emitted from the injection nozzle 18 that emits the skirt 17. Filled in the cavity space, and 7 are arranged in parallel with the movable plate 12, and the adsorption plate 22 formed of the magnetic body as the adsorption member is disposed forward and backward from the rear plate 13 along the guide post 21, and is guided by the guide column. Further, on the adsorption plate 22, a guide hole 23 through which the guide post 21 is inserted is formed at a position corresponding to each of the guide posts 21. The guide hole 23 includes a large opening on the front end surface (the right end surface in the drawing) The diameter portion 24 and the small diameter portion 25 connected to the large 201006655 diameter portion 24. The large diameter portion _ | B 4 nucleus nut n2. The small diameter portion 25 opens to the rear end surface of the adsorption plate 22 and has a guide column u sliding In order to move the movable plate 12 forward and backward, the linear motor 28 as a driving portion for opening and closing the mold is disposed between the suction plate 22 coupled to the movable plate 12 and the frame. The linear motor 28 is disposed on the frame Fr. Parallel to the guide and corresponding to the movement of the adsorption plate 22 Range of stators 29 and fixed to

The slide base Sb at the lower end of the suction plate 22 is fixed, and the mover 31 is formed to face the stator 29 and is formed to a predetermined range. The slide base 31), as shown in Fig. 2, is supported on the guide member Gd on both sides thereof, and the mover 31 is movably covered by the slide base Sb along the 荖宁工on/mouth 疋29 Above the sub-31 and extending over the guide

The direction in which the Gd extends. Therefore, the leg portion Ua forming the space 81 through which the guide base Gb and the slide base Sb pass at the lower end of the rear plate 13 is provided on the side mover 31 protruding toward the stator 29 and forming the magnetic pole teeth 33 at a predetermined pitch. The core material 34 and the coil 35 wound around each of the magnetic pole teeth 33. Further, the magnetic pole teeth 33 are formed at right angles to the moving direction of the movable plate 12, and are formed in parallel with each other. The stator 29, the core material, and a permanent magnet (not shown) formed to extend over the core material. The permanent magnets are formed by alternating magnetic poles of the N pole and the s pole and magnetized at the same pitch as the magnetic pole teeth 33. Therefore, when the predetermined current is supplied to the coil 35 to drive the linear motor 28, the mover 31 is advanced and retracted. As a result, the suction plate 22 fixed to the slide base sb and the movable plate 12 coupled to the suction plate 22 by the rod 39 advance and retreat to perform mold opening and closing. Further, although the permanent magnet is disposed on the stator 29 and the coil 35 201006655 is disposed on the mover 3, the coil may be disposed in the stator and the permanent magnet may be placed in the stator. At this time, when the linear motor 28 is driven, the coil does not move, and wiring for supplying electric power to the coil is easily performed. When the movable panel 12 advances (moving in the right direction in the drawing) and the movable mold star 16 abuts against the fixed mold 15, the mold closing is ended. After the mold is closed, the mold is clamped, and an electromagnet element 37 serving as a drive portion for mold clamping is disposed between the rear plate 13 and the suction plate 22. X, the rod 39 connecting the movable plate 12 and the suction plate 22 extends through the rear plate 13 and the suction plate 22. When the rod 39 is closed and opened, the movable plate 12 is advanced and retracted in conjunction with the advancement and retreat of the suction plate 22, and the clamping force generated by the electromagnet 37 is transmitted to the movable plate 12 during the mold locking. Further, the frame Fr, the fixed plate u, the movable plate 12, the rear plate 13, and the suction plate 1 are used. . (4) Iron/W dry 39 or the like constitutes a mold clamping device The electromagnet unit 37 has an electromagnet 49 disposed on the side of the rear plate 13 and an adsorption portion 51 disposed on the side of the adsorption plate 22. The predetermined portion of the rear end surface of the rear plate 13, i.e., slightly above and below the rod 39, has a rectangular cross-sectional shape extending in the horizontal direction, and two grooves 45 as coil arrangement portions are formed in parallel with each other. A core material 具有 having a rectangular cross-sectional shape is formed between 45, and a yoke 47 is formed in a portion other than the material 46 of the rear plate. The coil turns around the 46. % is a predetermined portion of the end surface of the adsorption plate 22, and an adsorption portion is provided in a portion of the adsorption plate 2 that surrounds the crucible 39' and the electromagnet 49, and the core material 46, the crucible and the adsorption plate 22 of the 2 13 are made of ferromagnetic It is formed by an electromagnetic laminated steel sheet formed by the formation of the body and the deposition of the binding plates. Further, although the rear plate 13 201006655 and the electromagnet 49 are disposed, respectively, the adsorption plate 22 and the adsorption portion 5 1 are disposed, and a part of the rear plate 13 forms a part of the electromagnet 'adsorption plate 22 to form an adsorption portion. Further, it is not necessary to use an electromagnetic laminated steel sheet, and the core material 46 and the yoke 47 may be formed by using an iron core formed of the same member. At this time, the distance between the pitches can be precisely set. Therefore, in the electromagnet unit 37, when a current is supplied to the coil 48 in the groove 45, the electromagnet 49 is excited, and the adsorption portion 51 is adsorbed to generate a mold clamping force. Here, a non-magnetic body (for example, a resin) as a contact preventing portion is disposed on at least a part of a distal end surface (a surface facing the rear plate 13) of the adsorption plate 22 that is adsorbed by the electromagnet on the first adsorption surface. The non-magnetic sheet 60 of the flat member is prevented from coming into contact with the rear end surface of the rear plate 13 of the second adsorption surface facing the first adsorption surface. Fig. 3 is a view showing an arrangement example of the non-magnetic sheets in the first embodiment. The same drawing is a front view of the front end face of the suction plate 22. In the same figure, the portion where the oblique line is added is the portion where the non-magnetic piece 6〇 is disposed. The non-magnetic sheet 6A is disposed as shown in the drawing, and the front end surface of the suction plate 22 may be a portion that abuts (contacts) the rear end surface of the rear plate 13 without the non-magnetic sheet 60. (The portion constituting the adsorption surface ). However, in the portion of the present embodiment which faces the coil 48, the non-magnetic sheet 6 is disposed (i.e., the non-magnetic sheet 60 is provided at a position avoiding the coil 48). Further, in the suction plate 22 and the mounting plate 27 to be described later, the hole 70 for fastening the thread penetrates in a direction orthogonal to the front end surface of the suction & 22 or the rear end surface of the rear & i 3 And set. When the hole 70 is sucked by the rear plate 13 and the suction plate 22 9 201006655 by mistake, the hole 70 is used for the fastening screw that separates the two. However, the presence of the hole 70 may affect the adsorption force of the electromagnet 49 at the time of clamping (e.g., magnetic circuit imbalance, etc.). Here, in the normal operation, in the hole 70, the magnetic body bolt 71 is disposed (threaded) from the rear toward the front. Thereby, the space of the hole 70 is buried by the magnetic body, and the influence of the hole 7〇 on the adsorption force is prevented. The rod 39 is coupled to the suction plate 22 at the rear end portion (the left end portion in the drawing), and is coupled to the movable plate 12 at the front end portion. The rod 39 is advanced by the suction plate 22 at the time of mold closing, whereby the movable plate 12 advances. Further, the lever 39 is retracted by the suction plate 22 retreating (moving in the left direction in the drawing) at the time of mold opening, whereby the movable plate 12 is retracted. Therefore, a hole 41 through which the rod 39 is inserted is provided in the central portion of the rear plate 13. Further, a hole 42 through which the rod 39 is inserted is formed in the central portion of the suction plate 22. Further, the opening facing the end of the hole 41 is provided with a sleeve bearing member 7 y. slidably supporting 39, and a thread is formed at the rear end portion of the rod 39, relative to Adsorption plate 2? can be #丝+从',

The nut 44, which is supported as a mold-thickness mechanism, is screwed to the thread 43. At the time point when the mold closing is completed, the adsorption plate 22# forms a gap between the rear plate m and the adsorption plate 22 near the rear plate m. When the gap becomes smaller and becomes larger, the adsorption portion 51 benefits: soil * a , ^ 1 The adsorption force is not sufficiently absorbed, and the clamping force becomes small. (The optimum value (distance or size) varies depending on the mold device: 爻Hi is shown here, in the nut, on the outer peripheral surface of the adsorption plate 22 44 Forming a large-diameter gear (not shown as a mold thickness for the drive section for mold thickness adjustment 10 201006655 Adjusting the motor (not shown, the small-diameter gear of the output shaft of the mold thickness adjustment motor) The gear formed on the outer circumferential surface of the nut 44 is formed. The thickness of the mold device 19 is driven to drive the mold thickness modulation motor. When the nut of the mold thickness adjustment mechanism is rotated, the crucible 44 is rotated quantitatively relative to the thread 43. When the adjustment lever 39 is positioned relative to the attachment plate 22, the position of the adsorption plate 22 relative to the fixed plate i] movable plate 12 is adjusted, so that the gap 5 becomes the most appropriate value. Changing the phase of the movable plate 12 and the adsorption plate 22

For the position, the mold thickness is adjusted. The adjustment of the thickness of the mold is a coarse adjustment according to the change of the thickness of the mold. For example, the micro-adjustment of the unit is changed by the position of the adsorption plate on the sliding base sb or the plate 13 is changed. The position of the piece is placed on the lock core device 1 , and the suction plate 22 is attached to the women's plate 27 which is ugly from the sliding base and is erected by the sliding base, and is adjusted by clamping the suction plate 22 and the women's clothing. The thickness of the spacer between the plates 27 is finely adjusted to the distance of the gap & and the 'mounting plate 27 has the rib 27a, and even if the reaction force of the clamping force acts on the mounting plate 27, the mounting surface of the mounting plate 27 is also In order to maintain the parallelism of the electromagnet and the adsorption plate, it is preferable to sandwich the gasket of the same size as the entire surface of the electromagnet or the adsorption plate, but it is difficult to use the same thickness as the size. Here, for example, when bolts are combined near the four corners of the substantially quadrilateral adsorption plate, only a small gasket is sandwiched near the four positions of the combination. At this time, the portion where the gasket is not sandwiched Forming a gap, deforming the adsorption plate and deteriorating the flatness The problem of the parallelism of the pedestal is deteriorated. 11 201006655 The mold thickness adjustment motor, the gear, the nut and the rod (9) are used to form the mold thickness adjustment skirt 4'. The rotation of the mold thickness adjustment motor is transmitted to the gear. The rotation transmitting portion of the thread 44. Then, the nut 44 and the thread 43 constitute a movement direction changing portion, and in the movement direction changing portion, the rotational motion of the nut 44 is converted into the linear motion of the rod 39. Next, for the mold clamping device The operation of 1〇 is explained. “At the time of mold closing, a current is supplied to the coil 35 in the state shown in Fig. 2 . ϋ·ιΗ-, aunt 1 ^, earth line ^ motor 28 is driven, movable plate 12 and suction

: Plate 22 #刖进' As shown in Fig. 1, the movable mold 16 abuts against the fixed mold 15. At this time, between the rear plate 13 and the adsorption plate ^, that is, between the electromagnet 49' and the adsorption crucible 51, the position of the adsorption plate μ is finely adjusted by a spacer: as a result, the highest target clamping force ρ can be obtained. Good gap $. Moreover, the force required to close the plate is small enough compared to the clamping force. Then, a current is supplied to the coil 48, and the adsorption portion of the adsorption plate that becomes the magnetic body is adsorbed by the adsorption force of the electromagnet 49. By taking this

The suction force of the plate 22 and the rod 39' is transmitted as a clamping force to the movable plate 12 to perform mold clamping. Further, the 'clamping force becomes the target set value, and the value of the current supplied to the coil 48 is determined, and the current is supplied to the line 疋. During the mold clamping period, in the injection device 17, the molten resin is ejected from the injection nozzle and filled in the cavity space of the mold device 19. In the first embodiment, even if the supply of the residual magnetic gas is stopped, the current in the cavity space is solidified, and the current is stopped from being supplied to the coil 48. At this time, the claws are transferred to the coil 48, and the magnetic gas remains in the adsorption portion 51. 12 201006655 times in the clamping process, a current is applied to the coil 48. Next, the coil 35 is supplied with a current in the reverse direction. Thereby, the linear motor 28 is driven to retract the movable plate 12. As shown in Fig. 2, the movable mold 16 is moved to the backward limit position to perform mold opening. Further, in the present embodiment, the linear motor 28 is disposed as the first drive. However, an electric motor, a hydraulic motor, or the like may be disposed instead of the linear motor 28. Further, when the motor described above is used, the rotational motion of the rotation by the drive motor is changed into a straight forward motion by the ball screw as the moving direction changing portion, and the movable plate 12 is advanced and retracted. Therefore, the gap between the two can be ensured at the time of mold clamping, for example, by the failure of the relative position of the relative positions of the rear plate 13 and the suction plate 22. However, in the mold clamping device 10 of the present embodiment, the non-magnetic sheets 60' are disposed on the front end surface of the suction plate 22 to prevent the magnetic bodies from coming into contact with each other. Fig. 4 is a view showing a state at the time of mold clamping in the case where the gap between the rear plate and the suction plate is not secured. # As shown in the figure, even when the gap between the rear plate 13 and the suction plate 22 is not secured, the non-magnetic piece 60 (non-magnetic material) exists between the two, and the contact area of the magnetic bodies is 0. %, the rear plate 13 and the adsorption plate 2 2 are not in contact. That is, the physical interval between the rear plate 13 and the suction plate 22 (referred to as "mechanical clearance < 5 a", see Fig. 2) is a gap with the magnetic body (referred to as "magnetic air gap < 5 b", Referring to Fig. 2) is small, whereby the contact of the magnetic bodies with each other can be avoided. Thereby, a non-magnetic body often exists between the rear plate 13 and the adsorption plate 2 2, and the magnetic circuit can be prevented from being completely closed. Therefore, when a gap is not ensured between the rear plate 13 and the suction plate 22, 13 201006655 can reduce the residual magnetic flux density after the supply of the current to the coil 48 is stopped as compared with the case where the rear plate 13 abuts against the adsorption plate 22. As a result, as shown in Fig. 4, the pressing plate 72 is screwed from the rear side with respect to the hole 7G, and the rear plate 13 is separated from the suction plate 22 by the fastening screw 72. Fig. 5 is a view showing a difference in residual magnetic flux density when the rear plate abuts against the suction plate and does not abut. Here, when the phantom current value is increased from 〇(1) to 1"Temple' magnetic flux density in order to obtain the fixed clamping force, the magnetic flux Bj' can be transmitted to the peak of the magnetic walk: choose β 旳 magnetic mining Degree βΡ. Therefore, after that, even if the low current I is subtracted and returned to 〇(A") 0#, + , the magnetic flux density does not represent ο (τ) ' represents the hysteresis caused by the residual magnetic flux. In the same figure, the relationship between the current 1 (the current supplied to the coil 48) and the magnetic flux density B between the rear plate 13 and the adsorption plate 22 when the rear plate 13 abuts against the adsorption plate 22 is shown. . (β) indicates the current in the state of Fig. 4 which is prevented from coming into contact by the non-magnetic piece 6〇! The relationship with the magnetic flux density β corresponds to the graph of the thickness of the non-magnetic sheet 6A. Moreover, in the figures of both sides,

Bf indicates the magnetic flux density necessary for obtaining the clamping force of the crucible, and indicates the magnetic flux density at which the rear plate 13 and the adsorption plate 22 are separable by the driving of the linear motor 28 (driving in the mold opening direction). Further, the rib indicates the magnetic flux density separated by the tightenable screw 72 or a jack (not shown) or the like. Further, the jack may be configured to extend between the fixing plate n and the movable plate 12, and the jack may be disposed on the rear plate 13 and the suction plate 22.

Br, Bra, and Brb represent the residual magnetic flux density. Further, in (β), the curve a indicates the use of a relatively thin non-magnetic sheet 60 (hereinafter referred to as "non-magnetic sheet 6〇a"), and the curve b indicates the use of a relatively thin non-magnetic sheet 6 (hereinafter referred to as 14 201006655) It is "non-magnetic piece 60b"). Therefore, Bra indicates the magnetic flux density at the time of using the non-magnetic sheet 6〇a, and Brb indicates the residual magnetic flux density when the non-magnetic sheet 6〇b is used. As shown in (A), the non-magnetic sheet 6 is not provided, and a current is supplied to the coil in a state where a gap cannot be ensured between the rear plate 13 and the adsorption plate 22, and the magnetic hysteresis relationship between the current and the magnetic flux density is even supplied. When the current to the coil 48 is 0 (A), the high magnetic flux density remains. At this time, the residual magnetic flux density φ is larger than Br and β1. That is, at this time, the two members cannot be separated by the fastening screw 72 or the linear motor 28. On the other hand, as shown by (β), in a state where the non-magnetic sheet 6 is used and the contact between the rear plate 13 and the adsorption plate 22 is avoided, even after the current is supplied to the coil 48, a high residual magnetic flux density can be prevented. At this time, the residual magnetic fluxes Bra and Brb are smaller than the residual magnetic flux density. That is, when a non-magnetic sheet is used, the residual magnetic flux density can be reduced. Further, the residual magnetic flux density Bb is smaller than the residual magnetic flux density Ba. In the case of using the non-magnetic sheet 6〇b having a thickness of Φ, the interval between the rear plate 13 and the suction plate 22 in the state of Fig. 4 becomes large. Therefore, when the non-magnetic sheet 6〇b is used, the rear plate and the adsorption plate 22 are easily separated. Specifically, the residual magnetic flux density Bra is smaller than Bb and larger than B1 according to the same figure. In other words, when the thin non-magnetic sheet 6a is used again, the rear plate 13 and the suction plate 22 can be separated by the fastening screw 72 or the like, but cannot be separated by the driving of the linear motor 28. On the other hand, the curve b can be obtained by using the non-magnetic sheet 60b. The residual magnetic flux density Brb is smaller than Bb and B1. In other words, the non-magnetic sheets 60b 15 201006655 at the time of use 28 can be separated not only by the fastening of the screw 72 or the like. At this time, the non-magnetic sheet 6〇b can also be set by the thickness of the linear motor to ensure that the current I f is supplied to the coil 48. Density Bf.

Further, the adsorption area of the rear plate 13 and the adsorption plate 22 is about 4 〇〇χ 4 〇〇 (the non-magnetic sheet 6 厚度 having a thickness of about 0.1 (mm) is disposed at the time of attack, and the obtained characteristic is represented by a curve & When the non-magnetic sheet 6〇 having a thickness of about 〇·2 (face) is disposed, the obtained characteristic is represented by a curve b. Further, in order to obtain an appropriate (rated) clamping force, the thickness of the non-magnetic sheet 60 is preferably 2 〇 (mm) or less. As described above, the thickness of the non-magnetic sheet 60 is preferably 〇1 (nm) or more, and 2 〇 (mm) or less is preferably 0.2 (_) or more and 2.0 (dragon) or less. In the first embodiment, the relationship between the adsorption force and the residual magnetic flux density is expressed by the following formula (1)

Fs = ( 1/2 only.) B2xS ... (1) F s : Adsorption force M. ·Magnetic permeability of air = 4; 7Γχ1〇-7 S: sectional area of non-magnetic sheet 60 [„!2]

Br : Residual magnetic flux density According to the relationship between the residual magnetic flux density of the formula (1) ' and the adsorption force, as shown in Fig. 6. Fig. 6 is a view showing the relationship between the residual magnetic flux density and the adsorption force in the first embodiment. In the same figure, the horizontal axis represents the residual magnetic flux density. The symbols (Bra, Brb) corresponding to the residual magnetic flux density are the same as those in Fig. 5. That is, Bra is a residual magnetic 16 when using a relatively thin nonmagnetic sheet 6 (nonmagnetic sheet 60a). 201006655 Beam twist 'Brb is when a relatively thick nonmagnetic sheet 6 (nonmagnetic sheet 6〇b) is used. Residual magnetic flux density. Further, the vertical axis indicates the adsorption force. F1 represents the driving force of the linear motor 28, and Fb represents the pressing force of the fastening screw 72. In the same figure, ρ 1 and the ratio correspond to the large adsorption force of Brb. Therefore, when the non-magnetic sheet 6〇b is used, the rear plate 13 can be separated from the adsorption plate 22 by one of the linear motor 28 or the fastening screw 72. Moreover, regarding Fb, it is larger than the adsorption force corresponding to Bra. Therefore, in the case where the non-magnetic sheet 6A is used, the rear plate 13 can be separated from the adsorption plate 22 by the fastening screw. Further, the non-magnetic sheet 6 is preferably made of an insulating material (i.e., an insulator (non-conductor)). In the case of a non-insulator (i.e., in the case of a conductor), an eddy current is generated on the adsorption surface, and the reactivity at the time of increasing the mold clamping force is deteriorated. This possibility is reduced as long as it is an insulator. Further, the non-magnetic sheet 60 is disposed on the rear end surface of the rear plate 13, instead of the suction plate 22. Further, it may be disposed on both of the adsorption plate 22 and the rear plate 13. That is, as long as it is disposed on one of the adsorption faces. Further, a hole 70 for fastening the screw may be provided on the rear plate 13. As described above, in the mold clamping device 1 of the first embodiment, since the non-magnetic sheets 6 are disposed on the adsorption surface of the electromagnet 49 for mold clamping, the magnetic bodies of the rear plate 13 and the adsorption plate 22 are prevented from being entirely facing each other. Abutment (contact). That is, in the first embodiment, the magnetic bodies are not in contact with each other. Therefore, in the case where the gap between the two cannot be ensured due to an adjustment error or the like, the two are relatively easy to separate. As a result, the delay of the forming operation can be reduced. Therefore, in the first embodiment, the non-magnetic sheet 6 is disposed on the entire surface of the adsorption surface formed by the adsorption 17 201006655 ' (but the coil 48 is not included but the non-magnetic sheet 60 does not necessarily have to be disposed on the entire surface. Except for the portion facing the front end of 22). This shows a second embodiment of another configuration example of the non-magnetic sheet 60. Fig. 7 is a view showing an arrangement example of a non-magnetic sheet of the second embodiment. In the seventh embodiment, the same portions as those in the third embodiment are denoted by the same reference numerals, and the description thereof is omitted as appropriate.

The non-magnetic sheets 6' as the contact preventing portions in Fig. 7 are disposed at four corners of the front end surface of the suction plate 22. However, it does not have to be at four corners. For example, it may be disposed at the upper two positions and the lower position of the front end face, or at three positions of the upper one position and the lower two positions. Further, the non-magnetic sheet 60 is disposed at a lower position by the restriction that the front end surface of the suction plate 22 is prevented from coming into contact with the rear end surface of the rear plate 丨3. Thus, even if the non-magnetic sheet 6 is disposed only in a part of the adsorption surface, the same effect as that of the first embodiment is applied. That is, even in this case, the abutting (contact) of the entire surfaces of the rear plate 13 and the so-called magnetic bodies of the suction plate 22 is prevented, and the magnetic bodies are not in contact with each other.

In the present embodiment, the non-magnetic material (non-magnetic sheet 60) is used as a member (contact preventing portion) for preventing the front end surface of the suction plate 22 from coming into contact with the rear end surface of the rear plate 13, but it is also possible The magnetic force is used as the contact preventing portion in a range where the force calculated by the following formula (2) is smaller than the force required when the adsorption plate 22 and the rear plate 13 are separated. ( 1/2// 〇) ( Brs2xSs+ Br(2xSf) (2) F s : adsorption force β: permeability of air = 47Τχ1 (Γ7 18 201006655 ss: sectional area of contact prevention part of magnetic body [m2]

Brs : residual magnetic flux density of the contact preventing portion of the magnetic body Sf : sectional area other than the contact preventing portion [m2 ] (that is, when the sectional area of the adsorption plate 2 2 is Sp) S S = SP — Ss)

Bm : residual magnetic flux density of a portion other than the contact preventing portion of the electromagnet 49 (part of gf)

In the formula (2), when the magnetic material has a cross-sectional area of Ss, the residual magnetic flux density of the contact preventing portion is Brs, the cross-sectional area other than the contact preventing portion is Sf, and the residual magnetic flux density of the portion other than the contact preventing portion is Brf. When necessary, there must be a fastening bolt that generates a force greater than Fs. Therefore, the core area of the contact preventing portion can be determined within the range of the pressing force of the fastening bolt 72. Here, the contact preventing portion is disposed on the same pole (the outer side of the coil in Fig. 7), so that the magnetic circuit is not formed when the contact is made. Further, the magnetic flux residual density can be obtained by testing the magnetic properties (B-H) characteristics of a general magnetic material. Fig. 8 is a view showing the characteristics of B H in the electromagnet when the magnetic body is used for the contact preventing portion. In the same figure, the horizontal axis (4) represents the magnetic field, and the vertical axis (8) represents the magnetic flux density. In the same figure, the curve f is a B-H characteristic of a portion other than the contact preventing portion of the electromagnet 49. The curve s is a characteristic of the contact preventing portion of the magnetic body. The curve r is the B-H characteristic of the composite curve f and the curve s, that is, the entire B-H characteristic of the electromagnet 49. As shown in the same figure, the magnetic contact area of the magnetic contact area or the contact prevention part is magnetized by the path indicated by the arrow 19 201006655 to the saturation magnetic flux density (1 or Bf) so far. Then, when the magnetic field is reduced to 〇, the magnetic flux density is not "remaining. The magnetic (four) degree at this time is Brs or thus by the electromagnet 49 (between the rear plate 12 and the adsorption plate 22), Br becomes Brs and Bri. 'The residual magnetic flux density Br ( Br = Brs + Bri) is obtained. Further, according to the formula (2), the relationship between the residual magnetic flux density and the adsorption force is as shown in Fig. 9. Fig. 9 is a second embodiment in which a magnetic body is used. The contact P square stops: the relationship between the residual magnetic flux density and the adsorption force at p. The coordinate axis of the same figure is the same as that of Fig. 6. In the same figure, the value of the residual magnetic flux 〇 density K (BrUBrf) corresponds to the rear plate 12 The area of the contact portion 接触 (contact portion) between the adsorption plate u (the sum of the segment surfaces of the contact preventing portion) is expressed, that is, 'L indicates that the abutting portion is 10% of the segment area of the adsorption plate 22 The residual magnetic flux density Br. Further, Br2 indicates the residual magnetic flux density when the abutting portion is 5 (%) of the segment area of the adsorption plate 22, and the material of the contact preventing portion is the same as that of the adsorption plate 在 in the same figure. Therefore, 'Brs = Brf is true. Φ Another-face' F1 indicates the driving force of the linear motor 28. The fear indicates the pushing force of the fastening screw 72. In the figure, the Fb ratio is larger than the corresponding suction force. Therefore, when the abutting portion of the magnetic body is less than 5%, the rear plate 13 can be made by the fastening screw 72. It is separated from the adsorption plate 22. Further, the Fi^b is larger than the adsorption force corresponding to the core. Therefore, when the abutting portion of the magnetic body is 10% or less, even if the threaded motor 28 is driven or tightened by the screw 72... In one case, the rear plate 13 may be separated from the suction plate 22. When the magnetic body is used in the contact preventing portion, the area of the abutting portion (contact portion) caused by the contact preventing portion is preferably on the adsorption plate. 22: 201006655 The area of the cross-section (ie, the area of the adsorption surface) is 50% or less. In addition, if the separation by the linear motor 28 is considered, the area of the contact is better than the % of the area of the adsorption surface, and the contact prevention is prevented. The area of the abutting portion caused by the portion may be in a range that can be separated by the pressing force of the fastening screw 2 or the motive force of the linear motor 28 when the abutting portion abuts. The body contact preventing portion can be combined with the adsorption plate 22 or the rear plate 13

- Body formed. That is, it is disposed so that a convex portion is formed in the front end surface of the suction plate 22 or the rear end surface of the rear plate 13. Moreover, the contact preventing portion may be formed of the same material as the adsorbing 22 #. Even if it is a material different from the adsorption plate 22, the M characteristics may be lower than the adsorption plate 22 or the like (the residual magnetic flux density is small). In the third embodiment, the different members of the non-magnetic sheet 60 can be used as the contact, and the member other than the non-magnetic sheet 60 is used as the contact. The figure is a perspective view showing an example of a rear plate in the third embodiment. In the map, the same parts as those in the i-th and the second figures are given the same symbols in the (10) and (10) figures, and the same symbols as in the first and second figures are given the same symbol u. In the first diagram A and the tenth diagram, the arrow h and the arrow v respectively indicate the up-down direction (vertical direction) of the rear panel 13. Also,... Table 2? (horizontal direction), sitting suction..."u is not behind the rear panel 13 (ie, the direction in which the attachment plate 22 faces). Further, (α is a coil shape resulting from the shape of the core material 46. The same as the package shape of the point, the aunt, and the ring 48. That is, the line 48 48 of the (Α) condition is the U) direction of the rear plate 13 On the other hand, a part of it is wound as the function of the 201006655 contact prevention part. In the case of (B), the coils 48 are housed in the rear plate 48 and wound. This difference is in the third embodiment, and since it is not substantially different, the following description is common to both (A) and (B). In the third embodiment, the molding material 56 (resin molding material) for protecting the coil 48 is formed to protrude from the rear end surface of the rear plate 56. Therefore, the protruding portion (projecting portion) of the molding material 56 can obtain the same effect as the contact preventing portion in the second embodiment. That is, since the molding material 56 is a non-magnetic material, the protruding portion can prevent the magnetic bodies between the front end surface of the suction plate 22 and the rear end surface of the rear plate 13 from coming into contact with each other. Further, the thickness VII of the protruding portion of the molding material 56 is the same as the thickness of the non-magnetic sheet 6G in the first embodiment, and it is preferable that the thickness of the non-magnetic sheet 6G is equal to or less than (f) or more and 2.0 (s) or less, and 〇2 (_) or more and 2 〇 (five) or less. better. Further, in consideration of the balance at the time of contact, the portion (surface) facing the adsorption plate 22 in the protruding portion of the molding material 最好 is preferably a plane parallel to the other end surface of the adsorption plate 22. Therefore, in the third embodiment, the relationship shown in Fig. 5 is also established. ❹: Here, the molding material 56 is made thicker by making the molding material 56 protrude. As a result, the strength of the molding material becomes high, and the coil 48 or the like can be used. In the present embodiment: (4) The adsorption member having the first adsorption surface moves along with the opening and closing mold = the electromagnet holding member having the f surface is sucked with respect to the frame Fr: the electromagnet holding member may be opened and closed with the mold While moving, the attached member is fixed relative to the frame Fr. Although the linear motor is used as the mold and the door is opened in the present embodiment, the rotary type=and the 1 drive unit, the in-line type motor, the 锝1 motor and the linger can be used. The direct-acting drive 22 of the combination of the bead and the screw is 201006655: the opening and closing drive unit. The linear motion driving portion is formed such that the driving force of the driving force is between the linear motor Μ ..., 1 and the pressing force Fb of the fastening screw 72. The present invention is not limited to the specific embodiments, and various modifications and changes can be made without departing from the scope of the invention. The international case in this case is based on the Japanese patent application 帛2_—G984G9, which was filed on April 4, _8, and the entire contents of 2GG8-098409 are used in this international application. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a side view showing a state in which a mold device and a mold clamping device in a first embodiment are closed. Fig. 2 is a side view showing a state at the time of mold opening of the mold device and the mold clamping device in the first embodiment. Fig. 3 is a view showing an arrangement example of the non-magnetic sheets in the first embodiment. Fig. 4 is a view showing a state at the time of mold clamping in the case where the gap between the rear plate and the suction plate cannot be ensured. Figs. 5(A) and 5(B) are diagrams showing the difference in residual magnetic flux density when the rear plate abuts against the suction plate and when the rear plate is not in contact. Fig. 6 is a graph showing the relationship between the residual magnetic flux density and the adsorption force in the first embodiment. Fig. 7 is a view showing an example of installation of a non-magnetic sheet in the second embodiment.

Fig. 8 is a view showing the characteristics of b-H 23 201006655 in the electromagnet when the magnetic body is used in the contact preventing portion. Fig. 9 is a view showing the relationship between the residual magnetic flux density and the adsorption force when the contact preventing portion of the magnetic material is used in the second embodiment. Figs. 10(A) and (B) are perspective views showing an example of a rear plate in the third embodiment. [Description of main component symbols] lo < clamping device ll - - fixing plate 12 - / movable plate 13 - / rear plate 13a - foot 14 - / connecting rod 15, - fixed mold 16, - movable mold 17, - injection Device 18 - ^ injection nozzle 19 - "mold device 21 - - guide post 22 -. adsorption plate 23 - - guide hole 24, i large diameter portion 25, ^ small diameter portion 28, a linear motor

24 201006655 29 ~ stator 31 ~ mover 3 3 ~ magnetic pole teeth 3 4 ~ anger material 35 ~ coil 37 ~ electromagnet unit 39 ~ rod 41, 42 ~ hole

4 3 to thread 44 to nut 4 6 to anger material 47 to vehicle 4 8 to coil 49 to electromagnet 51 to adsorption portion 60 to non-magnetic sheet 70 to fastening bolt hole 71 to bolt 72 to fastening bolt 81 ~Space F r ~ frame Gd ~ guide Gb ~ guide base Sb ~ sliding base

Claims (1)

201006655 VII. Patent application scope: 1. A clamping device that uses an electromagnet to apply a clamping force, including: an electromagnet holding member to hold the electromagnet; and an adsorption member having a first adsorption by the electromagnet The contact prevention # is a combination of the first adsorption surface and the electromagnetic (four) (four) member to prevent the magnetic bodies from being in contact with each other between the second adsorption surfaces facing the adsorption surface. 2. The mold clamping device according to claim 2, wherein the contact portion of the magnetic bodies between the upper reference surface and the second adsorption surface is 50% of the area of the first adsorption surface. the following. 3. The mold clamping device according to claim 2, wherein the upper portion (the contact portion between the first adsorption surface and the second adsorption surface does not have a contact portion between the magnetic bodies. Ref. 4. In the above-described mold clamping device, a plate-shaped member which is a non-magnetic material of the contact preventing portion is disposed on at least one of the first adsorption surface and the second adsorption surface. The above-mentioned plate-shaped member is a mold-locking device according to the fourth aspect of the invention, wherein the plate-shaped member is The squeezing device or the second absorbing surface is disposed on the entire surface of the first absorbing surface or the second absorbing surface in a manner that avoids the position at which the coil of the electromagnet is formed. The member is disposed on the first adsorption surface or the second adsorption surface so as to avoid the position at which the coil forming the electromagnet is located. 26 201006655 8. As described in claim 4 Clamping device, The slab of the above-mentioned plate-shaped member is a thickness of q. 2min or more, 2. 0mm. The mold clamping device according to claim 3, wherein the contact preventing portion is formed on the second adsorption surface by a molding material corresponding to the electromagnet coil. 11. The mold clamping device according to claim 2, wherein the contact preventing portion is formed by at least one of the first adsorption surface or the second adsorption surface protruding from the magnetic body. 12. The mold clamping device of claim n, wherein the magnetic body is the same material as the electromagnet holding member or the adsorbing member. The mold clamping device according to claim 5, wherein the magnetic body is made of a material having a lower magnetic property than the electromagnet holding member and the adsorption member. 14. The scope of application of the invention relates to an electromagnet holding member and a hole for the first adsorption surface or the first fastening bolt. The mold clamping device according to the above aspect, wherein at least one of the upper adsorption members is formed in a direction slightly orthogonal to the two adsorption surfaces, and the mold clamping device according to claim 14, wherein A bolt of a magnetic body is disposed in the hole for the fastening screw. The mold clamping device according to claim 2, wherein at least η of the electromagnet holding member and the adsorbing member are slightly orthogonal to the first adsorption surface or the second adsorption surface of 27 201006655 The electromagnet holding member that is adsorbed by the residual magnetic field and the adsorbing member are separated by the pressing force of the fastening screw. 17. The mold clamping device according to claim 2, further comprising a mold switch driving portion that drives the mold switch, wherein the electromagnet holding member and the adsorption member that are adsorbed by the residual magnetic field are driven by the linear motor And separated. ❿ 28