JP5751593B2 - Clamping device - Google Patents

Description

  The present invention relates to a mold clamping device including a half nut and a locking joint and provided with a locking means that can satisfactorily execute engagement for mold clamping.

  Patent Document 1 discloses a mold clamping device including a half nut and a locking joint.

  In the technique of Patent Document 1, a movable mold is moved toward and away from a fixed mold by a mold opening / closing means, and an engagement portion of a tie bar connected to a piston of the mold clamping cylinder and a mold clamping cylinder are provided. In a mold clamping device that engages with a half nut provided on a non-side plate and performs mold clamping with the mold clamping cylinder, an operating means for advancing the half nut toward a forward completion position in the half nut engaging step And an engagement detecting means for detecting the engagement between the half nut and the engaging portion, and the mold clamping cylinder or tie bar. The tie bar is opened when no engagement signal is output by the engagement detecting means. Tie bar position adjusting means for moving in the direction is provided.

JP 2004-209949 A

  However, since the above-described prior art does not have a tie bar position detecting means, when the tie bar locking nodes and the half nuts are engaged, the outward locking nodes and the half nuts are brought into contact with the locking means. It was necessary to visually measure the gap amount between the surfaces using a ruler or the like. Since the locking means is contaminated with grease or the like, there is a problem that it is difficult to accurately measure the gap amount.

  The present invention has been made in view of the above-described problems, and is a mold for calculating an engagement gap between a half nut and a locking node by actually measuring an engagement position and a contact position between the half nut and the locking node. An object is to provide a fastening device.

In order to achieve the above object, the invention according to claim 1 is characterized in that a mold provided between a fixed platen and a movable platen is clamped by a locking unit comprising a half nut and a locking node and a pressing unit. The mold clamping device includes a position detecting means for detecting a position of the locking groove of the half nut and a position of the locking node and detecting a relative position thereof, and the locking node can enter the locking groove. The detected engagement value detected by the position detecting means at the time, and the newly detected position of the locking groove of the half nut when the locking groove and the contact surface of the locking node contact each other And an engagement gap calculating means for calculating an engagement gap between the locking groove and the locking node based on a contact detection value detected by the position detecting means using the position of the locking node. It is characterized by providing.

According to this configuration, the mold clamping device detects the position of the locking groove and the position of the locking node of the half nut and detects the relative position thereof , and the locking node can enter the locking groove. The engagement detection value detected by the position detection means at that time, and the position and locking of the locking groove of the half nut newly detected when the locking groove and the contact surface of the locking node contact each other Engagement gap calculating means for calculating the engagement gap between the locking groove and the locking node based on the contact detection value detected by the position detection means using the position of the node. Therefore, since the operator can check the engagement gap of the locking means in the control device without going to the place of the locking means, it is possible to monitor and control the engagement gap safely and accurately. There is an effect.

  The invention according to claim 2 is characterized in that the contact detection value is a value when the pressing force of the pressing means is released. According to this invention, since the detection of the contact detection value is not affected by the displacement of the mold position due to the pressing force, an accurate contact detection value can be obtained.

  The invention according to claim 3 is characterized in that it is determined whether or not the engagement gap is within a predetermined allowable width. According to the present invention, since the positioning failure of the locking means is monitored, the mold clamping device can be operated safely and efficiently.

  The invention according to claim 4 is characterized in that when the engagement gap is not within a predetermined allowable width, a target value of the engagement gap is corrected. According to this invention, since the engagement failure based on the positioning failure of the locking means can be prevented in advance, the continuous automatic operation of the mold clamping device can be continued well.

It is sectional drawing which shows the outline | summary of the state which can engage with the half nut of a mold-clamping apparatus which concerns on this invention, and a locking node with a control apparatus. It is sectional drawing which shows the outline | summary of the state which the half nut and latching node of the mold clamping apparatus which concern on this invention engaged and contact | abutted. It is a flowchart which shows the automatic driving | operation operation | movement of the mold clamping apparatus which concerns on this invention with an engagement clearance measurement means.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. However, parts corresponding to each other in all the drawings in this specification are denoted by the same reference numerals, and description of the overlapping parts will be omitted as appropriate.

  As shown in FIGS. 1 and 2, the mold clamping device 1 includes a fixed platen 2 fixed to a base (not shown), a movable platen 3 that is provided so as to be close to and separated from the fixed platen 2, and a fixed platen. 2 and the movable platen 3 are inserted into the fixed platen 2 at the end thereof and connected to the piston 9 and provided with a plurality of tie bars 5 provided with locking nodes 6 over a predetermined range on the movable platen 3 side.

  A fixed mold 15 and a movable mold 16 which are mold-matched to form a mold are respectively attached to opposing surfaces of the fixed plate 2 and the movable plate 3. In addition, it is good also as a structure which provides the intermediate | middle board which attaches and rotates a metal mold | die between a fixed board and a movable board.

  Mold opening / closing means are provided on the side surfaces of the fixed platen 2 and the movable platen 3. The mold opening / closing means includes a servo motor 11 provided on the side surface of the fixed platen 2, and a ball screw 12 that is screwed into a ball nut fixed to the side surface of the movable platen 3 and driven by the servomotor 11. Since the servo motor 11 incorporates an encoder, the position of the movable platen 3 relative to the fixed platen 2, that is, the mold position, is detected by a pulse signal of the encoder constituting one of the position detecting means. A hydraulic cylinder or the like can also be used as the mold opening / closing means. In this case, the mold position is detected by a position detector of position detecting means provided between the fixed platen 2 and the movable platen 3 separately from the hydraulic cylinder.

  Locking means is provided on the surface of the movable platen 3 on the side opposite to the fixed platen 2. The locking means includes a half nut 4 provided so as to be movable away from or close to each other in the vertical direction in the drawing by a driving means (not shown), and a skewer provided in a predetermined range on the movable platen 3 side of the tie bar 5. It consists of a dumpling-like locking node 6. The half nut 4 is configured such that a locking groove 7 having an inner shape similar to the outer shape of the locking node 6 is formed when the pieces divided into a plurality of pieces are integrated close to each other. Has been. When the half nuts 4 are separated from each other, as shown in FIG. 1, the locking nodes 6 having the same diameter as the tie bars 5 pass through both end edges of the locking groove 7 of the half nut 4. When the locking node 6 is positioned at a predetermined position, the width W1 of the locking node 6 is set to be smaller than the width W2 of the locking groove 7, so that the locking node 6 is locked to the half nut 4. It becomes possible to enter the groove 7.

  A plurality of the locking nodes 6 are provided at an arbitrary interval, and the engagement with the one at the position adapted according to the thickness of the mold is selected. Further, the plurality of locking nodes 6 may be configured to simultaneously engage with the plurality of locking grooves 7. The cross-sectional shape of the locking node 6 is rectangular in the drawing, and the contact surface is provided in a direction orthogonal to the mold opening / closing direction, but may be, for example, a sawtooth shape. In that case, the cross-sectional shape of the locking groove 7 also corresponds to the cross-sectional shape of the locking node.

  On the surface of the fixed platen 2 on the side opposite to the movable platen 3, a hydraulic cylinder 14 is provided as a locking node moving means. The rod of the hydraulic cylinder 14 is connected to a tie bar 5 that extends through the stationary platen 2. A plurality of hydraulic cylinders 14 are provided with the extended portion of the tie bar 5 as a symmetric point. In addition, a position detector 13 that detects the position of the locking node 6 with respect to the stationary platen 2 and constitutes the other of the position detecting means is provided in the extended portion of the tie bar 5. A servo motor or the like can be used as the locking node moving means. In this case, the position of the locking node 6 is detected by an encoder built in the servo motor.

  The stationary platen 2 is provided with a pressing means. The clamping means includes a mold clamping cylinder 10 provided at a portion where the tie bar 5 is inserted in the fixed platen 2, and a piston 9 which is inserted into the mold clamping cylinder 10 so as to be able to advance and retract. Although the mold clamping cylinder 10 is shown as being built in the fixed platen 2, it may be provided so as to protrude toward the non-movable platen 3 side of the fixed platen 2.

  Next, an automatic continuous molding cycle operation by the above-described mold clamping apparatus 1 will be described based on the flowchart of FIG.

  The control device 17, which is an engagement gap calculation means for calculating the engagement gap, feeds a drive current to the servo motor 11 to rotate the ball screw 12 and moves the movable platen 3 toward the fixed platen 2. As a result, the movable mold 16 is closed and matched with the fixed mold 15 (S1).

  The control device 17 supplies pressure oil to the hydraulic cylinder 14 and positions the tie bar 5 so that the position of the locking joint 6 detected by the position detector 13 becomes the target value Lo stored in the control device 17 in advance. Control (S2). In this position, the locking groove 7 of the half nut 4 can enter the locking node 6.

  The control device 17 samples and stores the mold position data MA detected by the encoder of the servo motor 11 and the tie bar 5 (locking node 6) position data TA detected by the position detector 13 as engagement detection values ( S3). Here, the encoder of the servo motor 11 and the position detector 13 constitute position detecting means. And since the encoder can detect the position of the half nut 4 with respect to the fixed platen 2 and the position detector 13 can detect the position of the tie bar 5 (locking node 6) with respect to the fixed platen 2, the position detecting means It is possible to detect the relative position between the locking groove 7 of the half nut 4 and the locking node 6.

  The pair of half nuts 4 are brought close to each other, and the locking node 6 enters the locking groove 7 to engage the locking groove 7 and the locking node 6 (S4). In the above, the engagement detection value of the relative position before the engagement between the engagement groove 7 of the half nut 4 and the tie bar 5 (the engagement node 6) is measured by the position detection means. However, when measuring the engagement detection value of the relative position after the engagement between the engagement groove 7 of the half nut 4 and the tie bar 5 (the engagement node 6), the engagement node 6 can enter the engagement groove 7. Included in the relative position measurement.

  The control device 17 supplies pressure oil to the pressure increasing chamber 8 of the mold clamping unit formed by the piston 9 and the mold clamping cylinder 10. Then, the tie bar 5 moves to the right in the drawing, and the contact surfaces of the locking groove 7 and the locking node 6 contact each other. Further, by supplying pressure oil to the pressure increasing chamber 8, tension is generated in the tie bar 5, and the fixed mold 15 and the movable mold 16 are pressed and clamped. An injection device (not shown) injects molten resin into a mold cavity that is clamped. The injection device plasticizes the resin raw material into a molten resin in preparation for the next molding. Meanwhile, the molten resin filled in the mold cavity is cooled to become a molded product (S5).

  The pressure oil in the pressure-increasing chamber 8 is guided to the drain to release the clamping force of the mold clamping means (S6). At this time, contact between the contact surfaces of the locking groove 7 and the locking node 6 is maintained.

  The control device 17 samples and stores the mold position data MB detected by the encoder of the servo motor 11 and the data TB of the tie bar 5 (locking node 6) position detected by the position detector 13 as a contact detection value ( S7). Here, the encoder of the servo motor 11 and the position detector 13 constitute position detecting means.

  The control device 17 calculates (TA-TB)-(MA-MB) to obtain the engagement gap L during actual molding (S8). The control device 17 can display the engagement gap L on the screen. In step S8, the control device 17 functions as an engagement gap calculation means.

  The control device 17 determines whether or not the engagement gap L is within a predetermined allowable width (S9). The allowable width is provided in a predetermined range from the target value Lo, and may or may not be the same value in the positive and negative directions. The allowable width is data that is appropriately set according to the form and physique of the locking means and is stored in the control device 17 in advance. The minimum value of the allowable width is zero, and the maximum value is a value less than the difference between the width W2 of the locking groove 7 and the width W1 of the locking node 6.

  When the engagement gap L is within the predetermined allowable width, the process proceeds to the next step. When the engagement gap L is not within the predetermined allowable width, the target value Lo is corrected so that the difference between the engagement gap L and the target value Lo is eliminated (S10). Further, this correction may be performed based on an amount that the engagement gap L exceeds a predetermined allowable width. Further, these corrections may be executed for each molding cycle regardless of the determination in step S9. Furthermore, an alarm or warning may be issued or the mold clamping device may be stopped when NO is determined in step S9 or during correction.

  Thereafter, the mold clamping device 1 releases the engagement between the locking groove 7 and the locking node 6 by separating the half nuts 4 as locking means from each other (S11). Then, the control device 17 supplies a drive current to the servo motor 11 to rotate the ball screw 12 and moves the movable platen 3 so as to be separated from the fixed platen 2. As a result, the movable mold 16 is opened and one molding cycle is completed (S12).

As is clear from the above detailed description, the mold clamping device 1 of the present embodiment detects the position of the locking groove 7 and the position of the locking node 6 of the half nut 4 and detects the relative position thereof. And the detected value detected by the position detecting means when the locking node 6 can enter the locking groove 7 and the contact surfaces of the locking groove 7 and the locking node 6 contact each other. The engagement between the engagement groove 7 and the engagement node 6 based on the detected contact value detected by the position detection means using the position of the engagement groove and the position of the engagement node of the newly detected half nut. Engaging gap calculating means S8 for calculating the gap L. Therefore, the operator can confirm the engagement gap L of the locking means in the control device 17 without going to the place of the locking means. For this reason, there is no measurement error of the engagement gap due to individual differences among workers or a deteriorated measurement environment, so that it is possible to monitor and control the engagement gap safely and accurately.

  In addition, this invention includes what can be implemented in the aspect which added various change, correction, improvement, etc. based on the knowledge of those skilled in the art. Further, it goes without saying that any of the embodiments to which the above-mentioned changes are added is included in the scope of the present invention without departing from the gist of the present invention.

  For example, the mold clamping device 1 has been described as an example in which the locking means is on the movable platen 3 side and the pressing means is on the fixed platen 2 side. However, the locking device is on the fixed platen side, and the pressing means is on the movable platen. The mold clamping device of the present invention can be configured by being provided on the side. Moreover, the structure which provides the mold clamping machine which has a clamping means in the anti-fixed board side of a movable board, and provides a locking means in a mold clamping board may be sufficient. Further, the mold clamping device is not limited to the one in which the engagement tie 6 is provided in the tie bar 5, and may be one in which the engagement joint 6 is provided in a mechanical ram fixed to the center of the back surface of the movable platen 3. In this case, the mold clamping cylinder 10 is provided on the pressure receiving plate, and the half nut 4 is engaged with the engagement node 6 in the ram of the mold clamping cylinder 10.

  Further, although the engagement gap calculation means (S8) has been described as being in operation in the continuous molding cycle of automatic operation by the mold clamping device 1, the gap calculation means in the manual operation by operating the mold clamping device 1 manually. Can be made to function. Alternatively, in order to measure only the engagement gap between the locking groove 7 and the locking node 6, the mold clamping cylinder 10 does not increase the pressure to the set pressure, and the contact surface of the engagement groove 7 and the engagement node are not increased. The contact detection value may be detected by obtaining the contact of the 6 contact surfaces from the change in the hydraulic pressure, or detecting the contact detection value after releasing the pressure after slightly increasing the pressure.

DESCRIPTION OF SYMBOLS 1 Clamping apparatus 2 Fixed board 3 Movable board 4 Half nut 5 Tie bar 6 Locking node 7 Locking groove 8 Pressure increasing chamber 9 Piston 10 Mold clamping cylinder 11 Servo motor 12 Ball screw 13 Position detector 14 Hydraulic cylinder 15 Fixed mold 16 Movable mold 17 Control device L Engagement gap W1 Locking node width W2 Locking groove width

Claims (4)

In a mold clamping device that clamps a mold provided between a fixed plate and a movable plate by a locking means including a half nut and a locking node and a pressure clamping means,
Position detecting means for detecting the position of the locking groove of the half nut and the position of the locking node and detecting the relative position thereof ;
The engagement detection value detected by the position detection means when the locking node can enter the locking groove, and the new value when the contact surfaces of the locking groove and the locking node contact each other. Based on the contact detection value detected by the position detecting means using the position of the locking groove of the half nut and the position of the locking node detected in the step, the relationship between the locking groove and the locking node is determined. An engagement gap calculating means for calculating a gap;
A mold clamping device comprising: 2. The mold clamping apparatus according to claim 1, wherein the contact detection value is a value when a clamping force of the clamping means is released. The mold clamping apparatus according to claim 1, wherein it is determined whether or not the engagement gap is within a predetermined allowable width. 4. The mold clamping device according to claim 3, wherein when the engagement gap is not within a predetermined allowable width, a target value of the engagement gap is corrected.