JP2005349836A - Movable die suspension device of injection molding apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To make it possible to increase rigidity of a movable die suspension device without increasing thickness of a board of a mold mounting plate. <P>SOLUTION: The movable die suspension device can be set forth with a movable die, which can receive a load caused by a driving force of a driving source. The device comprises a mold mounting plate 15 equipped with a mold mounting surface, a first load receiving part receiving the said load, and a second load receiving part, a load transmit member wherein the first end is connected to the said first load receiving plate and the second load receiving plate and the other end is connected to a back surface 20 of the said mold mounting plate 15 and the loads from the said first load receiving part and the said second load receiving part are transmitted to the back surface 20 of the said mold mounting plate 15, a tubular load receiving connecting part 41 which connects the first load receiving part to the second load receiving part. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a movable mold support device for an injection molding machine.

  Conventionally, in an injection molding machine, a resin heated and melted in a heating cylinder is injected at a high pressure to fill the cavity space of the mold apparatus, and the resin is cooled and solidified in the cavity space. By doing so, the molded product is molded.

  For this purpose, the mold apparatus is composed of a fixed mold and a movable mold, and the mold is opened and closed, that is, the mold is closed by moving the movable mold forward and backward by the mold clamping apparatus and moving it toward and away from the fixed mold. The mold clamping and mold opening can be performed. The mold clamping device generally includes a fixed platen for holding a fixed mold and a movable platen for holding a movable mold, and a toggle mechanism is provided as an opening / closing device for moving the movable platen back and forth. Are actuated by driving an electric motor, a servo motor or the like disposed in the drive unit.

  FIG. 2 is a first side view of a conventional movable platen, and FIG. 3 is a second side view of the conventional movable platen.

  In the figure, reference numeral 107 denotes a plurality of, for example, four tie bars installed between a fixed platen and a toggle support (not shown), and 100 is arranged to face the fixed platen, along the tie bar 107. It is a movable platen that can be freely moved forward and backward (moved in the horizontal direction in the figure).

  A fixed mold (not shown) is mounted on a mold mounting surface of the fixed platen facing the movable platen 100, and a mold mounting surface of the mold mounting plate 101 of the movable platen 100 facing the fixed platen. A movable mold 105 is attached to 101a.

  Further, an upper load receiving portion provided with an upper pin insertion hole 102a into which a toggle pin on the upper side of the toggle mechanism is inserted on the surface opposite to the mold mounting surface 101a of the mold mounting plate 101, that is, the back surface. 102 and a lower load receiving portion 103 having a lower pin insertion hole 103a into which a lower toggle pin is inserted is formed. Here, the upper load receiving portion 102 and the lower load receiving portion 103 are strength members that receive the force of mold closing and clamping to be moved to the right in the figure from the toggle mechanism, and thus are integrated with the mold mounting plate 101. Formed.

  Further, the movable platen 100 is provided with, for example, four guide portions 104 including guide holes 106 into which the tie bars 107 are inserted, as many as the number of tie bars 107. In each of the guide holes 106, a bush 108 for sliding movement with the tie bar 107 is fitted. Further, grease as a lubricant is accommodated in the gap between the guide hole 106 and the tie bar 107.

  When the movable platen 100 is moved forward (rightward in the drawing) by a toggle mechanism (not shown), the movable mold 105 is pressed against a fixed mold (not shown), and mold closing and clamping are performed.

The toggle mechanism is disposed behind the movable platen 100 (left side in the figure), and is generally a toggle lever supported to be swingable with respect to the cross head, and is swingable with respect to the toggle support. And a toggle arm supported to be swingable with respect to the movable platen. The toggle lever and the toggle arm are linked to each other, and a mold clamping force obtained by multiplying a driving force such as a motor by a toggle magnification is applied to the upper load receiving portion 102 and the lower load receiving portion 103 of the movable platen 100. To communicate.
None

  However, in the conventional movable mold support device, when a strong force is received from the toggle mechanism by mold clamping and mold closing, the mold mounting plate 101 is bent (bent) and the mold mounting surface 101a is deformed. May end up.

  As shown in FIG. 2, the upper load receiving portion 102 and the lower load receiving portion 103 are located above and below the movable mold 105, respectively. The movable mold 105 is pressed against a fixed mold (not shown) so that it cannot move. For this reason, when a strong force to the right in the drawing is received from the toggle mechanism, a bending moment acts on the mold mounting plate 101, and the mold mounting plate 101 bends and deforms like 101 '. Accordingly, the mold mounting surface 101a is also deformed like 101a '. Note that the mold mounting plate 101 ′ and the mold mounting surface 101 a ′ in FIG. 2 are exaggerated for convenience of explanation.

  As described above, when the mold mounting surface 101a is deformed like 101a ', the movable mold 105 is also deformed, so that the moldability of the molded product is deteriorated.

  Therefore, in the conventional movable mold support device, the rigidity of the mold mounting plate 101 is increased by increasing the thickness of the mold mounting plate 101 in order to prevent the mold mounting plate 101 from being bent and the mold mounting surface 101a from being deformed. It is improving.

  However, if the thickness of the mold mounting plate 101 is increased, the manufacturing cost of the movable platen 100 increases, and the weight of the movable platen 100 increases, so the strength of the entire injection molding machine needs to be improved. The manufacturing cost of the entire injection molding machine is also increased.

  Further, in the conventional movable mold support device, the grease 109 leaked from between the inner peripheral surface of the bush 108 and the outer peripheral surface of the tie bar 107 flows down and adheres to the mold mounting surface 101a and the movable mold 105. I had to do it.

  As shown in FIG. 3, the grease stored in the gap between the guide hole 106 of the guide portion 104 and the tie bar 107 leaks from between the inner peripheral surface of the bush 108 and the outer peripheral surface of the tie bar 107. In this case, the grease 109 leaking to the back surface side of the mold mounting plate 101 falls even if it flows down, so there is no problem, but the grease 109 leaking to the mold mounting surface 101a side is The possibility of adhering to a wide range of the mounting surface 101a and adhering to the movable mold 105 is very high.

  When the grease 109 attached to the mold mounting surface 101a or the movable mold 105 adheres to the molded product, the molded product becomes a defective product, and the defective product occurrence rate of the injection molding machine increases.

  The present invention solves the problems of the above-mentioned conventional movable mold support apparatus, and can increase the rigidity of the movable mold support apparatus without increasing the thickness of the mold mounting plate. An object is to provide a mold support apparatus.

  Therefore, in the movable mold support apparatus of the injection molding machine of the present invention, the movable mold can be mounted, and the movable mold support apparatus receives a load based on the propulsive force by the drive source, and the mold mounting surface A mold mounting plate, a first load receiving portion and a second load receiving portion that receive the load, one end connected to the first load receiving portion and the second load receiving portion, and the other end mounted to the mold A load transmitting member connected to the back surface of the plate and transmitting the load from the first load receiving portion and the second load receiving portion to the back surface of the mold mounting plate; and the first load receiving portion and the second load receiving portion. And a cylindrical load receiver connecting member.

  In the movable mold support device of another injection molding machine of the present invention, the mold mounting plate is thicker at the position where the load transmitting member is connected than at other positions.

  In still another movable mold support device for an injection molding machine according to the present invention, the load transmission member further applies a load from the first load receiving portion and the second load receiving portion to advance and retreat the movable mold support device. The direction is changed to the direction and transmitted to the back surface of the mold mounting plate.

  In the movable mold support device of still another injection molding machine of the present invention, the load transmission member is further connected at one end to the first load receiving portion and at the other end than the first load receiving portion. A first load transmitting member connected to the back surface of the mold mounting plate at a position close to the center of the mold mounting plate, one end connected to the second load receiving portion, and the other end from the second load receiving portion And a second load transmitting member connected to the back surface of the mold mounting plate at a position close to the center of the mold mounting plate.

  In the movable mold supporting apparatus of still another injection molding machine of the present invention, the movable mold supporting device further includes a guide portion that engages with the guide means, and moves along the guide means.

  In still another movable mold supporting device of an injection molding machine of the present invention, the guide means is a tie bar, and the guide portion includes a guide hole into which the tie bar is inserted.

  In the movable mold supporting apparatus of still another injection molding machine of the present invention, the guide means is a guide rail, and the guide portion includes an engagement guide that engages with the guide rail.

  In the movable mold support device of still another injection molding machine of the present invention, the surface of the guide portion on the mold mounting surface side is further located on the back side than the mold mounting surface.

  According to the present invention, in the movable mold support device of an injection molding machine, the movable mold can be mounted, and the movable mold support device receives a load based on the propulsive force by the drive source, and includes a mold mounting surface. A mold mounting plate, a first load receiving portion and a second load receiving portion that receive the load, one end connected to the first load receiving portion and the second load receiving portion, and the other end mounted to the mold A load transmitting member connected to the back surface of the plate and transmitting the load from the first load receiving portion and the second load receiving portion to the back surface of the mold mounting plate; and the first load receiving portion and the second load receiving portion. And a cylindrical load receiver connecting member.

  In this case, the rigidity of the load receiving portion connecting member is increased and the load receiving portion connecting member is not deformed.

  In the movable mold support device of another injection molding machine, the mold mounting plate is thicker at the position where the load transmitting member is connected than at other positions.

  In this case, the rigidity of the movable mold support device is further increased, and the mold mounting plate is not bent.

  In still another movable mold supporting device of an injection molding machine, the load transmitting member is further connected at one end to the first load receiving portion and attached at the other end to the mold than the first load receiving portion. A first load transmitting member connected to the back surface of the mold mounting plate at a position close to the center of the plate, one end is connected to the second load receiving portion, and the other end is more than the second load receiving portion. And a second load transmission member connected to the back surface of the mold mounting plate at a position close to the center of the mold mounting plate.

  In this case, since it acts at a position close to the center of the mold mounting plate, the bending moment is reduced, and the mold mounting plate does not bend even if the thickness of the mold mounting plate is not increased. Therefore, it is possible to prevent bending of the mold mounting plate and deformation of the mold mounting surface without increasing the thickness of the mold mounting plate.

  Moreover, even if the load from the 1st load receiving part and the 2nd load receiving part is transmitted to a back surface via a load transmission member, the part near the center of a metal mold | die mounting plate hardly deform | transforms.

  In still another movable mold supporting device of an injection molding machine, the guide means is a tie bar, and the guide portion includes a guide hole into which the tie bar is inserted.

  In this case, the movable mold supporting device can smoothly advance or retract along the tie bar without providing a separate guide means.

  In still another movable mold supporting device of an injection molding machine, the guide means is a guide rail, and the guide portion includes an engagement guide that engages with the guide rail.

  In this case, the movable mold support device can move smoothly along the guide rail, the position accuracy of the mold is improved, and a highly accurate molded product can be molded. Further, there is a problem that the grease leaked from between the outer peripheral surface of the tie bar and the inner peripheral surface of the guide hole adheres to the mold mounting surface or the movable mold mounted on the mold mounting surface. Absent.

  In still another movable mold supporting device of an injection molding machine, the surface of the guide portion on the mold mounting surface side is located on the back side of the mold mounting surface.

  In this case, since the leaked grease does not flow down directly on the mold mounting surface, it is possible to prevent the grease from adhering to the mold mounting surface or the movable mold. Therefore, the grease attached to the mold mounting surface or the movable mold does not adhere to the molded product and the molded product does not become a defective product.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 4 is a schematic view of an injection molding machine according to the first embodiment of the present invention.

  In the figure, 21 is a frame, 23 is a fixed platen fixed to the frame 21, and 34 is a base plate that is movably disposed with respect to the frame 21 at a predetermined distance from the fixed platen 23. Toggle support as.

  Reference numeral 12 denotes a plurality of, for example, four, tie bars provided between the fixed platen 23 and the toggle support 34 as guide means.

  Reference numeral 11 denotes a movable platen as a movable mold support device which is disposed so as to face the fixed platen 23 and which can be freely moved back and forth (moved in the left-right direction in the drawing) along the tie bar 12. Further, the fixed mold 25 is attached to the mold attachment surface 37 of the fixed platen 23 facing the movable platen 11, and the movable mold is attached to the mold attachment surface 16 of the movable platen 11 facing the fixed platen 23. 24 is attached.

  A driving device for moving an ejector pin (not shown) may be attached to the rear end (left end in the figure) of the movable platen 11.

  A toggle mechanism 22 as a toggle type mold clamping device is provided between the movable platen 11 and the toggle support 34, and the rear end (left end in the figure) of the toggle support 34 is used for mold clamping of an injection molding machine. A drive device 30 as drive means is attached. The drive device 30 has a drive source 31 such as a servo motor, and can move the toggle mechanism 22 by advancing and retracting a cross head 35 as a driven member.

  As a result, the movable platen 11 is moved forward (moved in the right direction in the figure) to close the mold, and a mold clamping force obtained by multiplying the propulsive force by the drive source 31 by the toggle magnification is generated. The mold is clamped by force. In the present embodiment, the mold clamping force is generated by operating the toggle mechanism 22, but without using the toggle mechanism 22, the propulsive force from the drive source 31 is used as the mold clamping force as it is as a movable platen. 11 can also be transmitted.

  The toggle mechanism 22 includes a toggle lever 36 that is swingably supported with respect to the cross head 35, a toggle lever 32 that is swingably supported with respect to the toggle support 34, and the movable platen 11. The toggle arm 33 is supported so as to be swingable with respect to each other, and between the toggle lever 32 and the toggle lever 36 and between the toggle lever 32 and the toggle arm 33 are linked.

  Next, the movable platen 11 will be described.

  FIG. 1 is a perspective view of a movable mold support device according to the first embodiment of the present invention, FIG. 5 is a longitudinal sectional view of FIG. 1 according to the first embodiment of the present invention, and FIG. FIG. 7 is a side view of the movable mold supporting device according to the first embodiment of the present invention, FIG. 7 is a view taken along the arrow A in FIG. 6 according to the first embodiment of the present invention, and FIG. FIG. 9 is a cross-sectional view taken along arrow B, FIG. 9 is a cross-sectional view taken along arrow C in FIG. 7 in the first embodiment of the present invention, and FIG. 10 is a cross-sectional view taken along arrow D in FIG. 11 is a cross-sectional view taken along arrow E in FIG. 7 according to the first embodiment of the present invention.

  In this case, the movable platen 11 includes a plurality of, for example, four guides provided with tie bar guide holes 46 as guide holes that engage with the tie bars 12 as guide means at positions corresponding to the plurality of tie bars 12. Part 45 is formed. Further, tie bar bushes (not shown) are fitted into the tie bar guide holes 46 at the front and rear, respectively, and the inner peripheral surface of the tie bar bushes contacts and slides on the outer peripheral surface of the tie bar 12. It is like that. In the gap between the tie bar guide hole 46 and the tie bar 12, grease as a lubricant is stored. When the tie bar bush is omitted, the inner peripheral surface of the tie bar guide hole 46 directly contacts the outer peripheral surface of the tie bar 12 and slides.

  Here, as shown in FIGS. 6 and 9, the surface 50 of the guide portion 45 on the mold mounting surface 16 side is retracted from the mold mounting surface 16 and positioned on the back surface 20 side. That is, the recesses 49 are formed around the tie bar guide holes 46 on the mold mounting surface 16 of the movable platen 11. The recess 49 is formed so as to be recessed on the side opposite to the movable mold 24, and has a bottom surface parallel to the mold mounting surface 16. In addition, the concave portion 49 has, for example, a rectangular shape in which one corner is round and the length of each side is longer than the diameter of the tie bar guide hole 46. However, the concave portion 49 has any shape. Alternatively, a circular shape may be used. As a result, the grease leaked from between the inner peripheral surface of the tie bar bush and the outer peripheral surface of the tie bar 12 does not flow down the mold mounting surface 16 directly.

  The movable platen 11 has a mold mounting plate 15 on one side of which the mold mounting surface 16 is formed. Here, the mold mounting plate 15 has a substantially rectangular shape, and, for example, an ejector rod unit for driving an ejector pin protruding into a cavity in the mold is disposed at the center. For this purpose, a through hole 51 is provided. The through hole 51 may have any shape. Further, as shown in FIGS. 10 and 11, the thickness of the mold mounting plate 15 is preferably thick in the vicinity of the center. As described later, this is because the load from the upper load receiving portion 13 and the lower load receiving portion 17 is close to the center of the mold mounting plate 15 via the upper load transmitting member 42 and the lower load transmitting member 43. This is because it is transmitted to the back surface 20.

  Further, on the surface opposite to the mold mounting surface 16 of the mold mounting plate 15, that is, the back surface 20, an upper load receiving portion 13 as a first load receiving portion and a lower load receiving portion as a second load receiving portion. Part 17. The upper load receiving portion 13 and the lower load receiving portion 17 are separately formed on the left and right sides, but may be a single one.

  Here, the upper load receiving portion 13 includes an upper pin insertion hole 14 as a first pin insertion hole into which an upper toggle pin as a first pin of the toggle mechanism 22 is inserted, and the lower load receiving portion 17 is a toggle mechanism. The lower pin insertion hole 18 is provided as a second pin insertion hole into which the lower toggle pin 22 is inserted. The upper pin insertion hole 14 and the lower pin insertion hole 18 may have bushes for rotating in contact with the outer peripheral surfaces of the upper toggle pin and the lower toggle pin.

  The upper load receiving portion 13 and the lower load receiving portion 17 are connected to each other by a load receiving portion connecting member 41. Here, the load receiving portion connecting member 41 has, for example, a rectangular tube shape including a cylindrical hole 44 having a substantially rectangular cross section, but may have any shape. The upper end of the load receiving portion connecting member 41 is connected to the upper load receiving portion 13 and the lower end is connected to the lower load receiving portion 17.

  In the space in the cylindrical hole 44, devices such as an ejector rod unit and an ejector rod drive source attached to the back surface 20 of the mold mounting plate 15 can be accommodated.

  Further, the upper load receiving portion 13 is connected to the back surface 20 of the mold mounting plate 15 by an upper load transmitting member 42 as a load transmitting member, and the lower load receiving portion 17 is a lower load transmitting as a load transmitting member. The member 43 is connected to the back surface 20 of the mold mounting plate 15.

  Here, the end of the upper load transmitting member 42 on the mold attachment plate 15 side is connected to the back surface 20 of the mold attachment plate 15 at a position lower than the upper load receiving portion 13. That is, the upper load transmitting member 42 has one end connected to the upper load receiving portion 13 and the other end closer to the center of the mold attaching plate 15 than the upper load receiving portion 13. Is connected to the rear surface 20 of the main body. The end of the lower load transmission member 43 on the mold attachment plate 15 side is connected to the back surface 20 of the mold attachment plate 15 at a position higher than the lower load receiving portion 17. That is, the lower load transmitting member 43 has one end connected to the lower load receiving portion 17 and the other end closer to the center of the mold mounting plate 15 than the lower load receiving portion 17. Is connected to the rear surface 20 of the main body. The upper load transmission member 42 and the lower load transmission member 43 are separately formed on the left and right sides, but may be a single member. Further, the upper load transmission member 42 and the lower load transmission member 43 may be combined and integrally formed to form a single load transmission member.

  And in the part connected to the back 20 of the edge part by the side of the mold attachment plate 15 of the said upper load transmission member 42 and the lower load transmission member 43, ie, a part close | similar to a center, plate | board thickness of the mold attachment plate 15 Is thicker as shown in FIGS. For this reason, in the portion close to the center of the mold mounting plate 15, loads from the upper load receiving portion 13 and the lower load receiving portion 17 are transmitted to the back surface 20 via the upper load transmitting member 42 and the lower load transmitting member 43. Even if it is done, it hardly deforms.

  The upper load transmission member 42 and the lower load transmission member 43 are connected to a guide portion connecting member 48 for connecting a guide portion 45 as shown in FIGS. Here, since there are a plurality of, for example, four guide portions 45, a corresponding number of, for example, four guide portion connecting members 48 are also provided. One end of each guide portion connecting member 48 is connected to the guide portion 45, and the other end is connected to the upper load transmission member 42 or the lower load transmission member 43.

  The end surface of the load receiving portion connecting member 41 on the mold mounting plate 15 side is separated from the back surface 20 of the mold mounting plate 15. For example, an ejector rod unit, an ejector rod drive source, and the like are provided. A work hole 47 suitable for work for inspection or inspection is formed. Here, since the four working holes 47 are formed, for example, the operator of the injection molding machine can easily use the ejector rod unit, the ejector rod drive source, and the like attached to the back surface 20 of the mold mounting plate 15. Can be placed and inspected.

  The mold mounting plate 15, the upper load receiving portion 13, the lower load receiving portion 17, the upper load transmitting member 42, the lower load transmitting member 43, the load receiving portion connecting member 41, the guide portion 45, and the guide portion connecting member 48 are Since it is a strength member that receives the force of mold closing and mold clamping, it is desirable that the movable platen 11 be formed integrally by a method such as casting.

  Next, the operation of the movable mold support device of the injection molding machine having the above configuration will be described.

  FIG. 12 is a diagram showing the force acting on the movable mold support device according to the first embodiment of the present invention.

  First, the drive source 31 of the drive apparatus 30 shown in FIG. 4 is operated, and the toggle mechanism 22 is operated by moving the cross head 35 forward. Thereby, the movable platen 11 is moved forward, the movable mold 24 is joined to the fixed mold 25, the mold is closed, and then the mold is clamped. Subsequently, resin is injected at a high pressure from an injection device (not shown), and is filled in the cavity space of the movable mold 24 and the fixed mold 25. Then, the resin is cooled and solidified to form a molded product. Then, the drive source 31 is operated and the cross head 35 is retracted, whereby the movable platen 11 is retracted, the movable mold 24 is separated from the fixed mold 25, and the mold is opened. Subsequently, when an ejector rod (not shown) is advanced, the ejector pin projects into the cavity inside the movable mold 24 and ejects the molded product. Thereby, a molded product is taken out. By repeating the above operation, a large number of molded products are formed.

  The movable platen 11 repeats reciprocation along the tie bar 12. The tie bar guide holes 46 corresponding to the tie bars 12 are respectively fitted with tie bar bushes (not shown) on the front and rear sides, and grease is stored in a portion between the front tie bar bushes and the rear tie bar bushes. . Therefore, since the grease slightly enters between the inner peripheral surface of the tie bar bush and the outer peripheral surface of the tie bar, the lubrication between the inner peripheral surface of the tie bar bush and the outer peripheral surface of the tie bar 12 is always good and smooth. Therefore, the movable platen 11 can smoothly advance and retreat along the tie bar 12.

  Here, at the time of mold closing and mold clamping, as shown in FIG. 12, the pushing force F1 and the force F2 from the upper and lower toggle arms 33 of the toggle mechanism 22 are the upper load receiving portion 13 and the lower load of the movable platen 11. It acts on the receiving part 17. On the other hand, a reaction force from the fixed platen 23 acts on the mold mounting surface 16 of the mold mounting plate 15 as a pressing force F <b> 3 via the movable mold 24 and the fixed mold 25.

  In this case, it can be considered that the center of the force F3 acts along the central axis L3 of the mold mounting surface 16, and the forces F1 and F2 from the upper and lower toggle arms 33 are the upper load receiving portion 13 and the lower load. It acts on the receiving part 17 along the line L1 and the line L2.

  By the way, the end portions of the upper load transmission member 42 and the lower load transmission member 43 on the mold mounting plate 15 side are connected to the back surface 20 of the mold mounting plate 15 at positions close to the center of the mold mounting plate 15. . Therefore, the force F1 and the force F2 from the upper and lower toggle arms 33 are transmitted to the upper load transmission member 42 and the lower load transmission member 43, and the molds are formed along the lines L6 and L7 as the forces F1 ′ and F2 ′. It acts on the points P1 and P2 on the back surface 20 of the mounting plate 15. The lines L6 and L7 pass through the points P1 and P2 where the center line L4 and the center line L5 of the upper load transmission member 42 and the lower load transmission member 43 intersect the back surface 20 of the mold mounting plate 15, It is a straight line parallel to the central axis L3. Further, the magnitudes of the forces F1 'and F2' are equal to the forces F1 and F2, respectively. In this case, since the distance R2 between the line L6 and the line L7 and the central axis L3 is short, the magnitude of the bending moment acting on the mold mounting plate 15 by the force F1 'and the force F2' becomes small.

  On the other hand, if the movable platen 11 has a configuration similar to that of the movable platen 100 described in “Prior Art”, a force is applied to the point where the lines L1 and L2 intersect the back surface of the mold mounting plate 15. F1 and force F2 will act. Then, since the distance R1 between the lines L1 and L2 and the central axis L3 is much longer than the distance R2, the bending moment acting on the mold mounting plate 15 is increased.

  As described above, the distance between the point of action of the pressing force F1 ′ and the force F2 ′ from the upper and lower toggle arms 33 acting on the mold mounting plate 15 and the point of action of the reaction force pressing force F3 is short. The bending moment acting on the plate 15 is reduced. Therefore, the mold mounting plate 15 is not bent by the bending moment. Further, when the vicinity of the center of the mold mounting plate 15 is thick as shown in FIGS. 10 and 11, the mold mounting plate 15 is not deformed by the forces F1 ′ and F2 ′. .

  The upper load receiving portion 13 and the lower load receiving portion 17 are connected to the points P1 and P2 on the back surface 20 of the mold mounting plate 15 via the upper load transmitting member 42 and the lower load transmitting member 43. Therefore, the force F1 and the force F2 receive a force that pushes the upper load receiving portion 13 and the lower load receiving portion 17 in the vertical direction around the points P1 and P2. That is, a force that separates the upper load receiving portion 13 and the lower load receiving portion 17 from each other is received.

  However, since the upper load receiving portion 13 and the lower load receiving portion 17 are connected to each other by the load receiving portion connecting member 41, they are not separated from each other.

  Thus, in the present embodiment, the force from the upper and lower toggle arms 33 is transmitted to the upper load transmission member 42 and the lower load transmission member 43, and is close to the center of the back surface 20 of the mold mounting plate 15 P1. And acts on the point P2.

  For this reason, since the bending moment acting on the mold mounting plate 15 is reduced, the mold mounting plate 15 does not bend even if the thickness of the mold mounting plate 15 is not increased. Therefore, the deformation of the mold mounting surface 16 can be effectively prevented, so that the movable mold 24 is not deformed and the moldability of the molded product does not deteriorate.

  Further, since the surface 50 on the mold mounting surface 16 side of the guide portion 45 is located on the back surface 20 side with respect to the mold mounting surface 16, it is between the inner peripheral surface of the tie bar guide hole 46 and the outer peripheral surface of the tie bar 12. The grease leaking out from the pipe does not flow down the mold mounting surface 16 directly.

  Next, a second embodiment of the present invention will be described. In addition, about the thing of the same structure as the said 1st Embodiment, description is abbreviate | omitted by providing the same code | symbol.

  FIG. 13 is a side view of the movable mold support device according to the second embodiment of the present invention, FIG. 14 is a view as viewed in the direction of arrow F in FIG. 13 according to the second embodiment of the present invention, and FIG. FIG. 13 is a cross-sectional view taken along the arrow G in FIG. 13 in the second embodiment, FIG. 16 is a view taken along the H arrow in FIG. 14 according to the second embodiment of the present invention, and FIG. 14 is a cross-sectional view taken along the arrow I, and FIG. 18 is a cross-sectional view taken along the arrow J in FIG. 14 according to the second embodiment of the present invention.

  In the present embodiment, the movable platen 11 as the movable mold support device has a tie bar guide hole 57 as a guide hole that engages with the tie bar 12 as a guide means at a position corresponding to each of the plurality of tie bars 12. A plurality of, for example, four guide portions 55 are formed.

  Here, the structure of the guide portion 55 is substantially the same as that of the guide portion 45 in the first embodiment, and a tie bar bush (not shown) is fitted in each of the tie bar guide holes 57 on the front and rear sides, The inner peripheral surface of the tie bar bush is slid in contact with the outer peripheral surface of the tie bar 12. In the gap between the tie bar guide hole 57 and the tie bar 12, grease as a lubricant is stored. When the tie bar bush is omitted, the inner peripheral surface of the tie bar guide hole 57 directly contacts the outer peripheral surface of the tie bar 12 and slides.

  However, the guide portion 55 in the present embodiment is shorter than the guide portion 45 in the first embodiment, and the surface 56 on the mold mounting surface 16 side of the guide portion 55 is the back surface of the mold mounting plate 15. The upper load receiving portion 13 and the lower load receiving portion 17 are recessed with respect to 20. That is, as shown in FIGS. 13 and 16, a gap is formed between the surface 56 on the mold mounting surface 16 side of the guide portion 55 and the back surface 20. As a result, the grease leaking from between the inner peripheral surface of the tie bar bush and the outer peripheral surface of the tie bar 12 falls downward from the gap, and therefore does not flow down the mold mounting surface 16.

  Next, the operation of the movable mold support device of the injection molding machine having the above configuration will be described.

  First, the drive source 31 of the drive device 30 is activated, and the toggle mechanism 22 is activated by moving the cross head 35 forward. Thereby, the movable platen 11 is moved forward, the movable mold 24 is joined to the fixed mold 25, the mold is closed, and then the mold is clamped. Subsequently, resin is injected at a high pressure from an injection device (not shown), and is filled in the cavity space of the movable mold 24 and the fixed mold 25. Then, the resin is cooled and solidified to form a molded product. Then, the drive source 31 is operated and the cross head 35 is retracted, whereby the movable platen 11 is retracted, the movable mold 24 is separated from the fixed mold 25, and the mold is opened. Subsequently, when an ejector rod (not shown) is moved forward, the ejector pin protrudes into the cavity inside the movable mold 24 and ejects the molded product. Thereby, a molded product is taken out. By repeating the above operation, a large number of molded products are formed.

  The movable platen 11 repeats reciprocation along the tie bar 12. The tie bar guide holes 57 corresponding to the tie bars 12 of the movable platen 11 are respectively fitted with tie bar bushes (not shown) on the front and rear sides, and the portions between the front tie bar bushes and the rear tie bar bushes. The grease is stored. For this reason, since grease enters little by little between the inner peripheral surface of the tie bar bush and the outer peripheral surface of the tie bar 12, the lubrication between the inner peripheral surface of the tie bar bush and the outer peripheral surface of the tie bar 12 is always good, Since it slides smoothly, the movable platen 11 can smoothly advance and retract along the tie bar 12.

  Here, if the mold clamping device repeats the above operation for a long time, grease leaks little by little from between the inner peripheral surface of the tie bar guide hole 57 or the tie bar bush and the outer peripheral surface of the tie bar 12. Come. In the present embodiment, the surface 56 on the mold mounting surface 16 side of the guide portion 55 is retracted to the upper load receiving portion 13 and the lower load receiving portion 17 side from the back surface 20 of the mold mounting plate 15, and the surface There is a gap between 56 and the back surface 20. Therefore, on the surface 56 on the mold mounting surface 16 side, the grease leaked from between the outer peripheral surface of the upper two tie bars 12 and the inner peripheral surface of the tie bar guide hole 57 falls downward from the gap.

  Therefore, since the leaked grease does not adhere to the mold mounting surface 16, the mold mounting surface 16 and the movable mold 24 attached to the mold mounting surface 16 are contaminated by the grease. There is no.

  The leaked grease falls and adheres to the surface of the frame 21 and the floor surface on which the mold clamping device is installed, but these surfaces are separated from the movable mold 24 and the fixed mold 25. Therefore, there is no fear that the grease adhering to these surfaces adheres to the molded product. Further, since the leaked grease is very small, no particular problem occurs from the viewpoint of contamination of the mold clamping device and the surrounding environment.

  The grease leaking from between the outer peripheral surface of the tie bar 12 on the opposite side of the surface 56 of the mold mounting surface 16 and the inner peripheral surface of the tie bar guide hole 57 also flows down and falls. Since this surface is away from the movable mold 24 and the fixed mold 25, there is no fear that the grease adhered to this surface will adhere to the molded product. Further, since the leaked grease is very small, no particular problem occurs from the viewpoint of contamination of the mold clamping device and the surrounding environment.

  In the present embodiment, the force acting on the movable platen 11 at the time of mold closing and mold clamping is the same as that in the first embodiment, and a description thereof will be omitted.

  Thus, in the present embodiment, the surface 56 on the mold mounting surface 16 side of the guide portion 55 is retracted to the upper load receiving portion 13 and the lower load receiving portion 17 side from the back surface 20 of the mold mounting plate 15. Thus, a gap is formed between the surface 56 and the back surface 20.

  Therefore, on the surface 56 on the mold mounting surface 16 side, the grease leaked from between the outer peripheral surface of the upper two tie bars 12 and the inner peripheral surface of the tie bar guide hole 57 falls downward from the gap. In addition, there is no possibility of adhering to the mold attachment surface 16 or the movable mold 24 attached to the mold attachment surface 16. For this reason, the grease attached to the mold mounting surface 16 and the movable mold 24 does not adhere to the molded product and the molded product does not become a defective product.

  Next, a third embodiment of the present invention will be described. In addition, about the thing of the same structure as the said 1st and 2nd embodiment, description is abbreviate | omitted by providing the same code | symbol.

  FIG. 19 is a rear view of the movable mold support device according to the third embodiment of the present invention.

  In the present embodiment, a guide rail 63 as guide means is attached to the upper surface of the frame 21, and an engagement guide 62 as a guide portion is attached to the lower surface of the base member 61 attached to the lower end of the movable platen 11. Yes. The base member 61 may be omitted, and the engagement guide 62 may be directly attached to the lower end surface of the movable platen 11. The guide rail 63 may be attached to a member other than the frame 21.

  Here, the guide rail 63 is preferably a linear guideway rail, and the engagement guide 62 is preferably a linear guideway carriage. The linear guide way is also called a linear system, a linear guide, or an LM (Linear Motion) guide, and is a system in which a carriage engages with a rail and moves along the rail. In this case, a large number of rolling members such as rollers and balls are arranged between the carriage and the rail, and the carriage can smoothly move along the rail by rolling the rolling member. It is like that. Normally, the rolling member is held by a carriage and circulates in the circulation path. The carriage is engaged with the rail and can move in the axial direction of the rail, but cannot move in the direction perpendicular to the axis of the rail. Therefore, even when a load in a direction perpendicular to the axis of the rail is applied to the carriage, the carriage can move smoothly along the rail without rattling.

  However, the guide rail 63 and the engagement guide 62 need not be a linear guideway rail and carriage. Also in this case, the guide rail 63 and the engagement guide 62 have a cross-sectional shape as shown in FIG. 19, and along the guide rail 63 in a state where the engagement guide 62 is engaged with the guide rail 63. Moving. Note that a lubricant such as grease is supplied to the sliding surfaces of the guide rail 63 and the engaging guide 62 so as to reduce the frictional resistance.

  As described above, the engagement guide 62 according to the present embodiment receives the load in the direction perpendicular to the axis of the guide rail 63 (for example, the up / down / left / right direction in FIG. 19). It is possible to move smoothly in a direction perpendicular to the 19th page. Therefore, the engagement guide 62 moves smoothly along the guide rail 63 while receiving the weight of the movable platen 11 and the movable mold 24 attached to the movable platen 11. Further, even when a force is applied to the movable platen 11 from the lateral direction, the engagement guide 62 moves smoothly along the guide rail 63 without rattling.

  In the present embodiment, the tie bar 12 does not function as guide means as in the first and second embodiments. Therefore, the movable platen 11 in the present embodiment does not include the guide portions 45 and 55 as in the first and second embodiments, but includes a notch 58 through which the tie bar 12 passes. The notch 58 may have any shape and size as long as it does not interfere with the tie bar 12, and when the tie bar 12 is positioned outside the outer edge of the movable platen 11, It can be omitted.

  In the present embodiment, the operation of the movable platen 11 at the time of mold closing and mold clamping and the force acting on the movable platen 11 are the same as those in the first and second embodiments. The description is omitted.

  As described above, in the present embodiment, the engagement guide 62 attached to the lower end of the movable platen 11 is engaged with the guide rail 63 and moves along the guide rail 63. The guide rail 63 is a linear guideway rail, and the engagement guide 62 is a linear guideway carriage.

  Therefore, the movable platen 11 moves forward or backward smoothly without rattling from front to back, left and right, so that the position accuracy of the mold during mold closing, mold clamping, etc. is improved, and a highly accurate molded product can be molded. it can.

  Further, since the tie bar 12 does not function as guide means, the movable platen 11 does not need to include the guide portions 45 and 55 as in the first and second embodiments. Therefore, the grease leaked from between the outer peripheral surface of the tie bar 12 and the inner peripheral surfaces of the tie bar guide holes 46 and 57 adheres to the mold mounting surface 16 and the movable mold 24 attached to the mold mounting surface 16. The problem of doing so does not occur.

  Furthermore, since the weight of the movable platen 11 and the movable mold 24 attached to the movable platen 11 is not applied to the tie bar 12, the tie bar 12 is not deformed. Therefore, the position accuracy of the mold is improved, and a highly accurate molded product can be formed.

  In the above embodiment, the horizontal type injection molding machine in which the movable platen moves in the horizontal direction (horizontal direction) has been described. However, in the movable mold support device of the present invention, the movable platen is in the vertical direction (vertical direction). It can also be applied to a vertical type injection molding machine that moves to). Furthermore, the movable mold support apparatus of the present invention can be applied to a molding machine such as a die-cast machine and an IJ sealing press in addition to an injection molding machine.

  The present invention is not limited to the above-described embodiment, and various modifications can be made based on the spirit of the present invention, and they are not excluded from the scope of the present invention.

It is a perspective view of the movable mold support apparatus in a 1st embodiment of the present invention. It is a 1st side view in the conventional movable platen. It is a 2nd side view in the conventional movable platen. It is the schematic of the injection molding machine in the 1st Embodiment of this invention. It is a longitudinal cross-sectional view of FIG. 1 in the 1st Embodiment of this invention. It is a side view of the movable mold support device in a 1st embodiment of the present invention. It is A arrow line view of FIG. 6 in the 1st Embodiment of this invention. It is B arrow sectional drawing of FIG. 6 in the 1st Embodiment of this invention. It is C arrow line view of FIG. 7 in the 1st Embodiment of this invention. It is D arrow sectional drawing of FIG. 7 in the 1st Embodiment of this invention. It is E arrow sectional drawing of FIG. 7 in the 1st Embodiment of this invention. It is a figure which shows the force which acts on the movable mold support apparatus in the 1st Embodiment of this invention. It is a side view of the movable mold support apparatus in the 2nd Embodiment of this invention. It is F arrow line view of FIG. 13 in the 2nd Embodiment of this invention. It is G arrow sectional drawing of FIG. 13 in the 2nd Embodiment of this invention. FIG. 15 is a view on arrow H of FIG. 14 in the second embodiment of the present invention. It is I arrow sectional drawing of FIG. 14 in the 2nd Embodiment of this invention. FIG. 15 is a cross-sectional view taken along arrow J in FIG. 14 according to the second embodiment of the present invention. It is a rear view of the movable mold support apparatus in the 3rd Embodiment of this invention.

Explanation of symbols

11 Movable platen 12 Tie bar 13 Upper load receiving portion 14 Upper pin insertion hole 15 Mold mounting plate 16, 37 Mold mounting surface 17 Lower load receiving portion 18 Lower pin insertion hole 20 Rear surface 22 Toggle mechanism 31 Drive source 41 Load receiving connecting member 42 Upper load transmission member 43 Lower load transmission member 45, 55 Guide portion 46, 57 Tie bar guide hole 62 Engagement guide 63 Guide rail

Claims (8)

(A) A movable mold support device to which a movable mold can be attached and receives a load based on a propulsive force by a driving source,
(B) a mold mounting plate having a mold mounting surface;
(C) a first load receiving portion and a second load receiving portion that receive the load;
(D) One end is connected to the first load receiving portion and the second load receiving portion, the other end is connected to the back surface of the mold mounting plate, and the load from the first load receiving portion and the second load receiving portion. A load transmitting member that transmits the back surface of the mold mounting plate,
(E) A movable mold support device for an injection molding machine, comprising: a cylindrical load receiver connecting member that connects the first load receiver and the second load receiver. 2. The movable mold support device for an injection molding machine according to claim 1, wherein the mold mounting plate has a plate thickness at a position where the load transmission member is connected larger than a plate thickness at another position. The load transmitting member transmits the load from the first load receiving portion and the second load receiving portion to the back surface of the mold mounting plate by changing the direction in the advancing and retreating direction of the movable mold supporting device. 3. A movable mold support device for an injection molding machine according to 2. The load transmitting member has one end connected to the first load receiving portion and the other end connected to the back surface of the mold mounting plate at a position closer to the center of the mold mounting plate than the first load receiving portion. A first load transmission member having one end connected to the second load receiving portion and the other end closer to the center of the mold mounting plate than the second load receiving portion. The movable mold support device for an injection molding machine according to any one of claims 1 to 3, further comprising a second load transmission member to be connected. The movable mold support device for an injection molding machine according to any one of claims 1 to 4, further comprising a guide portion that engages with the guide means, and moves along the guide means. 6. The movable mold support device for an injection molding machine according to claim 5, wherein the guide means is a tie bar, and the guide portion includes a guide hole into which the tie bar is inserted. 6. The movable mold support apparatus for an injection molding machine according to claim 5, wherein the guide means is a guide rail, and the guide portion includes an engagement guide that engages with the guide rail. 6. The movable mold support device for an injection molding machine according to claim 5, wherein a surface of the guide portion on the mold mounting surface side is located on the back side of the mold mounting surface.

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