JP4827880B2 - Platen support device and mold clamping device - Google Patents

Description

  The present invention relates to a platen support device and a mold clamping device.

  Conventionally, in a molding machine, for example, an injection molding machine, a resin as a molding material heated and melted in a heating cylinder is injected at a high pressure to fill the cavity space of the mold apparatus, and in the cavity space. A molded product can be obtained by cooling and solidifying.

  For this purpose, the injection molding machine includes a mold device, a mold clamping device, and an injection device, the mold device includes a fixed mold and a movable mold, and the mold clamping device is used to attach the fixed mold. A fixed platen, a movable platen for attaching a movable mold, a toggle mechanism and the like are provided. The mold clamping device performs mold closing, mold clamping, and mold opening of the mold device by moving the movable platen back and forth along the tie bar.

  On the other hand, the injection device includes a heating cylinder that heats and melts the resin supplied from the hopper, and an injection nozzle that injects the molten resin, and a screw is rotatable in the heating cylinder, and It is arranged to be able to advance and retreat. Then, the resin is injected from the injection nozzle by moving the screw forward by a drive unit connected to the rear end, and the resin is weighed by moving backward by the drive unit.

  By the way, a platen support device is disposed between the frame of the injection molding machine and the movable platen so that the movable platen can be smoothly advanced and retracted along the tie bar, and the movable platen is supported by the platen support device. It has become so.

In this case, as the weight of the movable mold changes, the amount of downward deflection of the tie bar (hereinafter referred to as “sinking amount”) changes. In order to improve the durability of the platen support device, a linear guide is used for the platen support device (see, for example, Patent Document 1).
JP 2003-71894 A

  However, in the conventional platen support device, since the movable platen and the linear guide are constrained to each other, a large force generated by the toggle mechanism at the time of mold closing and mold clamping is transmitted to the movable platen. A bending moment is generated in the movable platen, which causes the movable platen to be deformed unevenly or tilted. As a result, an excessive force is applied to the mating surface of the mold device when the mold is closed and the mold is clamped, the mold device is damaged, or a vertical force is applied to the linear guide, causing the linear guide to be damaged. The durability of the platen support device is lowered. Further, as the movable platen deforms unevenly or tilts, the resin filled in the cavity space may leak out and a molding defect may occur.

  For example, even when the linear guides or guide rails are not arranged in parallel to each other but are opened in a “C” shape, a lateral force is applied to the linear guide so that the linear guide The platen support device becomes less durable due to breakage.

  Therefore, when the bending moment occurs, the linear plate should be enlarged so that the movable platen will not be deformed or tilted unevenly and no vertical force is applied to the linear guide. However, when the linear guide is increased in size, the platen support device is increased in size.

  In addition, it is conceivable to arrange a spring or the like between the movable platen and the linear guide. However, the urging force of the spring or the like is applied to the movable platen, linear guide, etc. It cannot be sufficiently prevented from being damaged. Therefore, the durability of the platen support device is lowered.

  The present invention solves the problems of the conventional platen support device, can improve the durability, can prevent molding defects from occurring in the molded product, and can be downsized. It is an object to provide a support device and a mold clamping device.

  Therefore, in the platen support device of the present invention, a movable platen that is advanced and retracted along the tie bar, a guide member that is disposed along the moving direction of the movable platen, and a guided member that is caused to travel on the guide member. A member, and a support unit that is disposed on the guided member and supports the movable platen in an unconstrained state.

  According to the present invention, in the platen support device, the movable platen that is moved forward and backward along the tie bar, the guide member that is disposed along the moving direction of the movable platen, and the guided member that is caused to run on the guide member. A member, and a support unit that is disposed on the guided member and supports the movable platen in an unconstrained state.

  In this case, since the movable platen is supported on the guided member in an unconstrained state by the support unit, a large force generated by, for example, a toggle mechanism is transmitted to the movable platen during mold closing and mold clamping. As a result, no bending moment is generated in the movable platen. Therefore, it is possible to prevent the movable platen from being deformed or tilted unevenly due to the bending moment, so that excessive force is not applied to the mating surface of the mold apparatus, and the durability of the platen support apparatus is improved. Can be improved.

  In addition, since the movable platen can be prevented from being deformed unevenly or inclined, the molding material filled in the cavity space does not leak and molding defects do not occur.

  Furthermore, since it is not necessary to increase the size of the guided member, the platen support device can be reduced in size.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In this case, an injection molding machine as a molding machine will be described.

  FIG. 2 is a conceptual diagram showing the main part of the injection molding machine in the embodiment of the present invention.

  In the figure, 11 is a frame that supports an injection molding machine, 12 is a stationary platen as a stationary mold supporting member attached to the frame 11, and 13 is a predetermined distance from the stationary platen 12, A toggle support 14 serving as a base plate movably disposed with respect to the frame 11 includes a plurality of first embodiments serving as a first guide member installed between the fixed platen 12 and the toggle support 13. In the embodiment, there are four tie bars, one end of each tie bar 14 is fixed to the fixed platen 12 via a fixture 15, and the other end of each tie bar 14 is connected to the toggle via a mold thickness adjusting member 16. It is fixed to the support 13.

  Reference numeral 18 denotes a movable platen as a movable mold support member which is disposed so as to be movable forward and backward along the tie bar 14 so as to face the fixed platen 12.

  A fixed mold 23 as a first mold is mounted on a mold mounting surface 21 facing the movable platen 18 in the fixed platen 12, and a mold mounting surface 22 facing the fixed platen 12 in the movable platen 18. A movable mold 24 as a second mold is attached. A mold apparatus 25 is constituted by the fixed mold 23 and the movable mold 24.

  The fixed platen 12, the mold thickness adjusting member 16 and the movable platen 18 are formed with tie bar guide holes (not shown) as through holes through which the tie bars 14 penetrate at positions corresponding to the tie bars 14. Are brought into contact with the outer peripheral surface of the tie bar 14 and are slid. A protrusion device (not shown) for advancing and retracting an ejector pin is attached to the back surface of the movable platen 18 (the surface facing the mold thickness adjusting member 16).

  A mold clamping motor 26 as a mold clamping drive unit is disposed on the back surface (the surface not facing the movable platen 18) of the mold thickness adjusting member 16, and drives the mold clamping motor 26. By doing so, the cross head 27 as the advance / retreat member is advanced / retreated. Further, a toggle mechanism 28 as a mold clamping mechanism is disposed between the mold thickness adjusting member 16 and the movable platen 18 so as to be extendable and contractable.

  The toggle mechanism 28 includes a toggle lever 31 that is swingably disposed with respect to the cross head 27, a toggle lever 32 that is swingably disposed with respect to the toggle support 13, and the movable platen 18. And the toggle levers 31 and 32 and between the toggle lever 32 and the toggle arm 33 are linked.

  The fixed platen 12, the mold thickness adjusting member 16, the movable platen 18, the mold clamping motor 26, the cross head 27, the toggle mechanism 28, and the like constitute a mold clamping device 35.

  Incidentally, a platen support device 36 is disposed between the movable platen 18 and the frame 11 in order to smoothly move the movable platen 18 back and forth along the tie bar 14. The platen support device 36 is slid with respect to the two guide rails 38 as the second guide members disposed in parallel along the moving direction of the movable platen 18 on the frame 11, and the guide rails 38. A support / guide unit 39 that is movably disposed and supports the movable platen 18 is provided, and the guide rail 38 has a cross section with a constricted portion.

  An injection device (not shown) is disposed to face the fixed platen 12. The injection device includes a heating cylinder as a cylinder member, a screw as an injection member that is rotatably and reciprocally disposed in the heating cylinder, an injection nozzle attached to a front end of the heating cylinder, A hopper disposed in the vicinity of the rear end of the heating cylinder, a metering motor as a metering drive connected to the screw, an injection motor as an injection drive connected to the screw, and the like. . The mold apparatus 25, the mold clamping apparatus 35, and the injection apparatus constitute an injection molding machine.

  Next, the operation of the injection molding machine having the above configuration will be described.

  When the mold clamping motor 26 is driven in the mold clamping device 35, the toggle mechanism 28 is extended, the movable platen 18 is advanced (moved toward the fixed platen 12), the mold is closed, and the movable mold is moved. 24 is brought into contact with the fixed mold 23, and a cavity space is formed between the movable mold 24 and the mold mounting surface 22. Subsequently, when the mold clamping motor 26 is further driven, a mold clamping force is generated in the toggle mechanism 28, and the movable mold 24 is pressed against the fixed mold 23 by the mold clamping force.

  On the other hand, in the injection device, when the measuring motor is driven and the screw is rotated in the measuring step, the resin as the molding material supplied from the hopper is heated and melted in the heating cylinder, and the front (metal) Is moved to the mold device 25 side) and collected in front of the screw. Along with this, the screw is retracted to a predetermined position.

  Further, in the injection process, when the injection nozzle is pressed against a sprue (not shown) of the mold apparatus 25 in a state where the mold is clamped, the injection motor is driven and the screw is advanced, the screw is accumulated in front of the screw. The injected resin is injected from the injection nozzle and filled into the cavity space.

  The resin in the cavity space is cooled and solidified, and a molded product is formed at this time. Subsequently, when the mold clamping motor 26 is driven in the reverse direction, the toggle mechanism 28 is bent, the movable platen 18 is retracted, and the mold is opened. At this time, a molded product is protruded by the protruding device.

  Next, the support / guide unit 39 will be described.

  FIG. 1 is a first perspective view showing an arrangement state of a support / guide unit in an embodiment of the present invention. FIG. 3 is a front view showing an arrangement state of a support / guide unit in an embodiment of the present invention. 4 is a side view showing the arrangement state of the support / guide unit in the embodiment of the present invention, and FIG. 5 is a second perspective view showing the arrangement state of the support / guide unit in the embodiment of the present invention.

  In the figure, 18 is a movable platen, and 39 is a support / guide unit. The support / guide unit 39 is disposed immediately below the tie bar guide hole 43 at both edges of the lower end of the movable platen 18. Reference numeral 41 denotes a bracket for swingably supporting the toggle arm 33 of the toggle mechanism 28 (FIG. 2), and 44 denotes a tie bar bush mounted in the tie bar guide hole 43.

  The support / guide unit 39 includes a support block 45 that supports the movable platen 18, and a first slide block 46 that slidably supports the support block 45 at one end side (the fixed platen 12 side) below the support block 45. A second slide block 47 that slidably supports the support block 45 on the other end side (toggle support 13 side) below the support block 45 and a first slide block 46 disposed below the first slide block 46. 1 linear guide 48, a second linear guide 49 disposed below the second slide block 47, and the like. The support block 45 and the first and second slide blocks 46 and 47 constitute a support unit. The support block 45 serves as a first support, and the first and second slide blocks 46 and 47 serve as a second support. The body is composed.

  The first and second linear guides 48 and 49 are attached to the first and second slide blocks 46 and 47 by bolts bt1 and bt2 as fixing elements, respectively. Further, the first and second linear guides 48 and 49 are guided on the guide rail 38 and are guided by the guide rail 38. For this purpose, each of the first and second linear guides 48 and 49 includes first and second side edges g1 and g2 covering both edges of the guide rail 38, respectively. A housing portion 50 is formed between the edges g1 and g2 to mainly surround the upper half of the guide rail 38.

  In this case, since the first and second linear guides 48 and 49 are used for the platen support device 36, even if the weight changes depending on the type of the movable mold 24, the amount of change in the sinking amount of the tie bar 14 is reduced. can do.

  By the way, when the movable platen 18 and the first and second linear guides 48 and 49 are constrained to each other, a large force generated by the toggle mechanism 28 at the time of mold closing and mold clamping is transmitted to the movable platen 18. Is done. At this time, if a bending moment is generated in the movable platen 18 by the transmitted large force, the movable platen 18 is deformed unevenly or tilted by the bending moment.

  In that case, an excessive force is applied to the mating surface of the mold apparatus 25 when the mold is closed and when the mold is clamped, the mold apparatus 25 is damaged, or a vertical force is applied to the first and second linear guides 48 and 49. Is added, the first and second linear guides 48 and 49 are damaged, and the durability of the platen support device 36 is lowered. In addition, as the movable platen 18 deforms unevenly or tilts, the resin filled in the cavity space may leak out, resulting in molding defects.

  Therefore, in the present embodiment, the movable platen 18 and the first and second linear guides 48 and 49 are supported by the support block so that the movable platen 18 and the first and second linear guides 48 and 49 are not restrained in the front-rear direction, the left-right direction, and the vertical direction. It mounts without being fixed on 45, and is supported by the support block 45 in an unrestrained state. In this case, even if the first and second linear guides 48 and 49 are not arranged in parallel to each other or the guide rails 38 are not arranged in parallel to each other, the movable platen 18 and the support block Due to the relative movement between the movable platen 45 and the movable platen 18, it is possible to prevent the eccentric load from being transmitted to the movable platen 18. That is, the movable platen 18 and the support block 45 function as a deformation allowing mechanism that allows deformation caused by an attachment error between the linear guide 38 and the tie bar 14.

  In order to maintain the state in which the movable platen 18 is placed on the support block 45, the support block 45 has a first support portion 51 formed to protrude from the movable platen 18 toward the fixed platen 12, and A second support portion 52 is provided below the movable platen 18, and a step portion 53 as a first front-rear restricting portion is formed between the first and second support portions 51, 52. The support block 45 is horizontally formed, a first upper surface s1 that forms a support surface for supporting the movable platen 18, a second upper surface s2 that is lower than the first upper surface s1, and an outer surface. A side surface s3, an inner side surface s4, a front surface (surface on the stationary platen 12 side) s5, a rear surface (surface on the toggle support 13 side) s6, are formed to be inclined, and slidably support the first slide block 46. A first bottom surface s7 that forms a sliding surface, a second bottom surface s8 that is formed to be inclined and supports the second slide block 47 so as to be slidable, and the first and second surfaces A third bottom surface s9 formed horizontally between the bottom surfaces s7 and s8. The first bottom surface s7 is formed so as to be inclined higher toward the front and lower toward the rear, and the second bottom surface s8 is formed to be inclined lower toward the front and higher toward the rear.

  Further, a locking projection 55 as a right and left restricting portion is hung downward from the movable platen 18 at a predetermined gap with the side surface s4 of the support block 45 at the bottom of the movable platen 18. Attached. The gap in the left-right direction between the support block 45 and the locking projection 55 is set to such a size that the movable platen 18 is merely placed on the support block 45 and is not restrained in the left-right direction. In the present embodiment, the locking projection 55 is formed independently of the movable platen 18 and is attached to the movable platen 18 by a bolt (not shown) as a fixed element, but is formed integrally with the movable platen 18. Can do. Therefore, the movable platen 18 and the support block 45 are disposed so as to be relatively movable in the left-right direction.

  Further, a notch 56 is formed at the rear end portion of the locking projection 55, and the notch 56 forms a stepped portion 57 as a second restricting portion in the front-rear direction. And the stopper block 58 is attached to the location corresponding to the said notch 56 in the side surface s4 of the said support block 45 with the bolts bt3 and bt4 as a fixing element. A gap in the front-rear direction between the support block 45 and the movable platen 18 in the step 53 and a gap in the front-rear direction between the locking projection 55 and the stopper block 58 in the step 57 are such that the movable platen 18 is on the support block 45. It is set to a size that is not restricted in the front-rear direction only by being placed.

  Therefore, the movable platen 18 is locked to the stepped portion 53, the forward movement of the movable platen 18 relative to the support block 45 is restricted in an unconstrained state, and the stopper block 58 is locked to the stepped portion 57, The backward movement of the movable platen 18 with respect to the support block 45 is regulated in an unconstrained state, the movable platen 18 is locked to each locking projection 55, and the movement of the movable platen 18 in the left-right direction with respect to the support block 45 is prevented. Regulated in an unconstrained state. The movable platen 18 and the support block 45 are disposed so as to be relatively movable in the front-rear direction.

  As a result, the movable platen 18 is placed on the support block 45 in an unconstrained state in the front-rear direction, the left-right direction, and the up-down direction, and is advanced and retracted.

  Further, in order to adjust the position of the movable platen 18 in the vertical direction, the first and second slide blocks 46 and 47 are disposed below the support block 45, and the first slide block 46 has a wedge portion. 61 and the upright portion 62 formed by projecting upward at the front end of the wedge portion 61, the second slide block 47 faces upward at the wedge portion 63 and the rear end of the wedge portion 63. An upright portion 64 formed to protrude is provided. The upper surface s11 of the wedge portion 61 is formed so as to correspond to the first bottom surface s7 to form a sliding surface that slidably supports the support block 45, and is inclined higher toward the front and lower toward the rear. The upper surface s12 of the wedge part 63 is formed so as to correspond to the second bottom surface s8 and form a sliding surface that slidably supports the support block 45, and is inclined lower toward the front and higher toward the rear. .

  Further, bolts bt5 and bt6 as adjusting elements for adjusting the height of the movable platen 18 are screwed into the upright portions 62 and 64, and the tip ends of the threaded portions of the bolts bt5 and bt6 are connected to the support block. The front surface s5 is brought into contact with the front surface s5 and the rear end of the support block 45 is brought into contact with the rear surface s6. Therefore, by rotating the bolts bt5 and bt6 to bring the upright portions 62 and 64 close to the support block 45, the wedge block 61 and 63 causes the support block 45 to move upward, and the first and first The movable platen 18 can be moved upward with respect to the two linear guides 48 and 49. Further, by rotating the bolts bt5 and bt6 in the opposite directions, when the raised portions 62 and 64 are separated from the support block 45, the support block 45 is moved downward, and the first and second linear guides 48 and 49 are moved. On the other hand, the movable platen 18 can be moved downward. Therefore, in the present embodiment, the position of the movable platen 18 in the vertical direction can be adjusted.

  As a result, each tie bar 14 has only a function of guiding the movable platen 18 in the axial direction.

  As described above, in the present embodiment, the movable platen 18 is placed on the support block 45 in an unconstrained state in the front-rear direction, the left-right direction, and the vertical direction, and is advanced and retracted. Even if a large force generated by the toggle mechanism 28 is transmitted to the movable platen 18, no bending moment is generated in the movable platen 18 accordingly.

  Therefore, the movable platen 18 is not deformed unevenly or tilted by the bending moment.

  In addition, since an excessive force is not applied to the mating surface of the mold apparatus 25 when the mold is closed and when the mold is clamped, the mold apparatus 25 is not damaged, and the first and second linear guides 48 and 49 are not damaged. Since no vertical force is applied to the first and second linear guides 48 and 49, the first and second linear guides 48 and 49 are not damaged. Therefore, the durability of the platen support device 36 can be improved.

  And since it is not necessary to enlarge the 1st, 2nd linear guides 48 and 49, the platen support apparatus 36 can be reduced in size.

  Even when the first and second linear guides 48 and 49 are run along the guide rail 38 when the arrangement accuracy of the guide rails 38 is low, the first and second linear guides 48 and 49 are left and right. No direction force is applied. Accordingly, it is possible to prevent the first and second linear guides 48 and 49 from being damaged and the durability of the platen support device 36 from being lowered.

  Furthermore, since the movable platen 18 is not deformed or tilted unevenly, it is possible to prevent the resin filled in the cavity space from leaking and causing molding defects in the molded product.

  In addition, this invention is not limited to the said embodiment, It can change variously based on the meaning of this invention, and does not exclude them from the scope of the present invention.

It is a 1st perspective view which shows the arrangement | positioning state of the support and guide unit in embodiment of this invention. It is a conceptual diagram which shows the principal part of the injection molding machine in embodiment of this invention. It is a front view which shows the arrangement | positioning state of the support and guide unit in embodiment of this invention. It is a side view which shows the arrangement | positioning state of the support and guide unit in embodiment of this invention. It is a 2nd perspective view which shows the arrangement | positioning state of the support and guide unit in embodiment of this invention.

Explanation of symbols

14 Tie Bar 18 Movable Platen 36 Platen Support Device 38 Guide Rail 45 Support Blocks 46, 47 First and Second Slide Blocks 48, 49 First and Second Linear Guides

Claims (5)

(A) a movable platen that is advanced and retracted along the tie bar;
(B) a guide member disposed along the moving direction of the movable platen;
(C) a guided member capable of traveling on the guide member;
(D) A platen support device comprising a support unit disposed on the guided member and supporting the movable platen in an unconstrained state.   2. The platen support device according to claim 1, wherein a restricting portion that restricts movement of the movable platen in the front-rear direction with respect to the support unit is formed between the support unit and the movable platen.   2. The platen support device according to claim 1, wherein a restriction portion that restricts movement of the movable platen in the left-right direction with respect to the support unit is formed between the support unit and the movable platen.   The support unit supports the movable platen via a horizontally formed support surface, and supports the first support via an inclined sliding surface. The platen support device according to claim 1, further comprising a second support.   The mold clamping apparatus provided with the platen support apparatus of any one of Claims 1-4.

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