JP5002307B2 - Molding device for injection molding machine - Google Patents

Description

  The present invention relates to an improvement of a mold clamping device of an injection molding machine.

As a mold clamping device of an injection molding machine, a type in which a movable plate is supported by a tie bar so as to be movable is widely adopted. Furthermore, it is desirable to support the movable plate with a movable plate support mechanism so that the tie bar does not bend (see, for example, Patent Document 1).
Japanese Utility Model Publication No. 07-12221 (FIGS. 1, 2, and 6)

Patent document 1 is demonstrated based on the following figure.
FIG. 7 is a diagram for explaining the basic configuration of the prior art. As shown in FIG. 7A, the mold clamping device 100 passes a plurality of tie bars 103, 103 to a stationary platen 101 and a pressure receiving plate 102. This is a device in which a movable platen 104 is provided on the tie bars 103, 103 and the movable platen 104 is moved to the left and right in the figure by a toggle link mechanism 104a.
Since it is difficult to bend the tie bars 103, 103 due to the load of the movable platen 104, the movable platen 104 is supported by the movable platen support mechanism 105.

  The movable platen support mechanism 105 includes a first taper surface 106 on the upper surface, a sintered layer 107 on the lower surface, and a grease nipple on the side surface, as shown in FIG. And a die plate 114 having a second taper surface 112 on the lower surface and a pulling bolt 113 at one end.

(C) is a cc arrow directional view of (b), and the die plate 114 is provided with a pull bolt 113 and a push bolt 115 at one end.
The push bolt 115 is a hexagon socket head cap screw. When the hexagon wrench 117 is inserted into the hexagon hole 116 and the push bolt 115 is turned, the end surface 118 of the slide plate can be pushed, and the slide plate 109 can be moved to the left in FIG. As a result, the distance H between the base 119 and the movable platen 104 can be reduced.

  In (c), the pulling bolt 113 has a hexagonal hole 121 at the head of the hexagonal bolt. When the hexagon wrench 117 is inserted into the hexagon hole 121 and turned, the end surface 118 of the slide plate can be pulled, and the slide plate 109 can be moved to the right in FIG. As a result, the distance H between the base 119 and the movable platen 104 can be increased.

  In other words, the movable platen support mechanism 105 mainly supports the movable platen 104 to prevent the tie bar 103 from being bent, but the movable platen 104 does not excessively contact the tie bar 103. It also has a function of finely adjusting the height of 104.

By the way, when adjusting the height, it is necessary to operate the hexagon wrench as shown by the arrow (1) in (a). In addition, as shown in (c), since the head of the pull bolt 113 and the head of the push bolt 115 are buried in the tie plate 114, it takes time to insert the hexagon wrench 117 into the hexagon hole 116 or 121. It takes. That is, the operation of the hexagon wrench 117 is troublesome and the height adjustment time is extended.
There is a need for a movable plate support mechanism that can easily adjust the height.

Further, grease is supplied from the grease nipple 108 to the sintered layer 107 to promote lubrication. An operator may supply excessive grease for fear of running out of lubrication. The excessively supplied grease overflows on the base 119 and a part thereof is scattered in the air.
Accordingly, there is a need for a lubrication structure that can be lubricated without lubrication or with a small amount of lubrication (or lubrication).

  It is an object of the present invention to provide a mold clamping device of an injection molding machine provided with a movable plate support mechanism that can easily adjust the height.

The invention according to claim 1 is a fixed platen, a pressure receiving plate disposed opposite to the fixed platen, a plurality of tie bars that pass between the pressure receiving plate and the fixed platen, and a movable guided by these tie bars. Bei example a board, and a movable platen support mechanism for supporting the movable plate movably,
The movable platen support mechanism includes a rail disposed on a base of an injection molding machine, a slider that moves on the rail and has a first taper surface on an upper surface, and a second taper surface corresponding to the first taper surface. And a block fixed to the movable platen,
The slider is a spheroidal graphite cast iron product, and includes a longitudinal portion extending along the rail, a standing portion raised from one end of the longitudinal portion, and a bolt hole opened in the standing portion,
A bolt extending in parallel to the rail from the slider is inserted into the bolt hole, and a pair of nuts screwed into the bolt is rotated so that the slider can be moved relative to the block. A mold clamping device for an injection molding machine,
One end of the bolt is inserted into the block, and one end of the bolt is detachably attached to the block by a pin screw screwed into the block .

  In the invention which concerns on Claim 2, the particle | grains of the element which consists of at least one of Cr, Nb, V, Mo, and Ti in the base of a copper or copper alloy are 0.5-10 in the bottom of the longitudinal part of a slider. A solid lubricant-dispersed copper-based sintered layer in which 1% by mass and 1 to 10% by mass of solid lubricant particles are dispersed is formed.

  The invention according to claim 3 is characterized in that the solid lubricant-dispersed copper-based sintered layer is impregnated with a lubricating oil by a vacuum impregnation method.

  In the invention according to claim 1, the slider can be moved with respect to the block by inserting a bolt extending parallel to the rail from the slider into the bolt hole and rotating a pair of nuts screwed into the bolt. Configured. The nut can be visually observed from the side of the injection molding machine, a spanner can be easily hung on the nut, and the nut can be easily turned. Therefore, according to the first aspect, it is possible to provide a mold clamping device for an injection molding machine provided with a movable plate support mechanism capable of easily adjusting the height.

  The slider is composed of a longitudinal portion extending along the rail, a standing portion raised from one end of the longitudinal portion, and a bolt hole opened in the standing portion, and has a complicated shape. By making it, it can cast easily. Compared with the case of cutting out from the block, the manufacturing cost can be significantly reduced.

  Note that spheroidal graphite cast iron has a fine cut surface after machining, as compared with gray cast iron, and has a good bonding force with the sintered layer when covered with the sintered layer. Spheroidal graphite cast iron is more expensive than gray cast iron, but has high mechanical strength, and there is no fear of breakage even if force is repeatedly applied with bolts and nuts. Therefore, high-grade spheroidal graphite cast iron was used as the slider material instead of low-grade cast iron such as gray cast iron.

In the invention which concerns on Claim 2, the solid lubricant dispersion | distribution copper-type sintered layer was coat | covered on the bottom of the longitudinal part of the slider. In the solid lubricant-dispersed copper-based sintered layer, fine solid lubricant powder is dispersed, and the solid lubricant powder exhibits a lubricating action. Since the solid lubricant is added in a small amount of 1 to 10% by mass and is dispersed in the sintered layer, it falls off from the sintered layer and there is almost no fear of scattering.
Therefore, according to the second aspect, the lubrication can be performed without lubrication or with a small amount of lubrication.

  The invention according to claim 3 is characterized in that the solid lubricant-dispersed copper-based sintered layer is impregnated with a lubricating oil by a vacuum impregnation method. The impregnated lubricating oil exerts a lubricating action. Provides smooth lubrication with solid lubricants. It is also possible to reduce the amount of solid lubricant added by the amount impregnated with the lubricating oil.

The best mode for carrying out the present invention will be described below with reference to the accompanying drawings. The drawings are viewed in the direction of the reference numerals.
FIG. 1 is a side view of a toggle type mold clamping device having a movable plate support mechanism according to the present invention. A toggle type mold clamping device 10 includes a fixed platen 11 and a pressure receiving plate 12 arranged to face the fixed platen 11. And tie bars 13, 13 passed to the pressure receiving plate 12 and the fixed platen 11, a movable platen 14 that moves along these tiebars 13, 13, and a toggle link mechanism 20 that drives the movable platen 14.

  The toggle link mechanism 20 includes first links 22 and 22 connected to the pressure receiving plate 12 via pins 21 and 21, and second links connected to the first links 22 and 22 via pins 23 and 23. 24, 24, pins 25, 25 connecting these second links 24, 24 to the movable platen 14, third links 26, 26 connected in the middle of the first links 22, 22, 3 includes a cross head 29 connected to the links 26 and 26 and a screw shaft 28 screwed to a nut 27 fitted to the cross head 29. When the screw shaft 28 is turned, the nut 27 is moved to the left in the figure. The first link 22 and the second link 24 change from a letter I to a letter V, and as a result, the movable platen 14 moves to the left in the figure. Next, if the nut 27 is moved to the right in the figure, the movable platen 14 moves to the right in the figure.

  At this time, the movable platen 14 is guided by the tie bars 13, 13, but it is not preferable to apply a bending force to the tie bars 13, 13. Therefore, as a countermeasure against bending, movable platen support mechanisms 30 and 30 are provided below the movable platen 14. Details of the movable platen support mechanism 30 will be described below.

  FIG. 2 is a perspective view of the movable plate support mechanism. The movable plate support mechanism 30 moves on the rail 31 on the base of the injection molding machine and has a first tapered surface 32 on the upper surface. And a block 35 having a second tapered surface 34 corresponding to the first tapered surface 32 and fixed to the movable platen 14.

  FIG. 3 is an exploded view of the movable platen support mechanism. The slider 33 includes a longitudinal portion 36 extending along the rail, a standing portion 37 raised from one end of the longitudinal portion 36, and a bolt opened in the standing portion 37. This is an L-shaped member composed of a hole 38. At the bottom of the longitudinal portion 36, 0.5 to 10% by mass of elements consisting of at least one of Cr, Nb, V, Mo and Ti in a copper or copper alloy substrate, solid lubricant particles A solid lubricant-dispersed copper-based sintered layer 39 in which 1 to 10% by mass is dispersed is formed. Details of the solid lubricant-dispersed copper-based sintered layer 39 will be described later.

On the other hand, the block 35 is provided with a pair of flanges 41, 41 on the lower surface so that the first taper surface 32 can be sandwiched between the flanges 41, 41. For example, a bolt insertion hole 42 and a pin hole are formed on one side. 43.
The bolt 44 to be inserted into the bolt hole 38 has a pin hole 45 at the tip, and most of the screw 44 is engraved so that the first nut 46 and the second nut 47 can be screwed in.

FIG. 4 is a cross-sectional view of the movable platen support mechanism. The block 35 is fixed to the bottom of the movable platen 14 with bolts 48 and 48. One end of a bolt 44 is inserted into the block 35, and a pin screw 49 is screwed into the pin holes 43 and 45. Thus, the bolt 44 extends from the block 35 in parallel to the rail 31. The block 35 may be integrally formed on the bottom of the movable platen 14. Then, the bolts 48 and 48 can be omitted.

  The first nut 46 is attached to the long bolt 44, the slider 33 is attached so as to cover the bolt hole 38, and finally the second nut 47 is attached. Thus, the slider 33 is connected to the block 35 via the bolt 44 and moves to the left and right of the drawing together with the fixed platen 38.

The operation of the movable platen support mechanism 30 having the above configuration will be described next.
FIG. 5 is an explanatory view of the operation of the movable plate support mechanism. In FIG. 5A, if it is necessary to increase the distance H1 between the rail 31 and the movable plate 14, the first nut 46 is loosened to the position indicated by the imaginary line. Then, the second nut 47 is turned clockwise. Then, the upright part 37 moves to the left of the figure by L1. During this movement, the first tapered surface 32 pushes up the second tapered surface 34.

  As a result, as shown in (b), the distance between the rail 31 and the movable platen 14 increases to H2 (H1 <H2). The loosened first nut 46 is turned counterclockwise, and the upright portion 37 is firmly sandwiched between the first nut 46 and the second nut 47. The first nut 46 serves as a locking nut. Thereafter, the slider 33 moves to the left and right in the drawing together with the movable platen 14 and the block 35.

  In (a), if it is necessary to reduce the distance H1 between the rail 31 and the movable platen 14, the second nut 47 is loosened. Next, the first nut 46 is turned counterclockwise. Then, as shown in (c), the slider 33 moves to the right in the figure, and as a result, the distance between the rail 31 and the movable platen 14 is reduced to H3 (H3 <H1).

During the above operation, the bolt 44 does not rotate, and the first nut 46 or the second nut 47 rotates. Since the first nut 46 or the second nut 47 pushes the upright portion 37, the slider 33 can be freely moved left and right with only one bolt 44.
The first nut 46 and the second nut 47 are rotated by a spanner. Since the spanner can be inserted from the front side of FIG. 1 and the first nut 46 and the second nut 47 can be visually observed, the movable plate is supported. Adjustment of the mechanisms 30, 30 is very easy.

Next, a method for manufacturing the slider 33 will be described.
FIG. 6 is a diagram for explaining a manufacturing process of the slider. As shown in FIG. 6A, a mold 53 having a gate 51 and a cavity 52 is prepared, and a spheroidal graphite cast iron melt is injected from the gate 51 into the cavity 52. . As shown in (b), the hot metal portion 55 is removed from the cast product 54 obtained, machining is performed up to the position of Δ, and the bolt hole 38 is opened with the drill 56 in the standing portion 37.

  Next, as shown in (c), the sintering raw material 57 is pressed and solidified on the bottom (upper surface) of the slider 33 with the top and bottom reversed, and the sintering raw material 57 is put into a sintering furnace 58 to perform a sintering process. This sintering process will be described in detail later. In (d), the copper-based sintered layer 39 is machined to the position indicated by Δ and adjusted to a desired thickness.

The copper-based sintered layer 39 will be described in detail.
The solid lubricant-dispersed copper-based sintered layer 39 has a solid content of 0.5 to 10% by mass of elements composed of at least one of Cr, Nb, V, Mo, and Ti in a copper or copper alloy substrate. 1 to 10% by mass of lubricant particles are dispersed.

The composition of the solid lubricant-dispersed copper-based sintered layer 39 was determined for the following reason.
First, an appropriate amount of at least one element of Cr, Nb, V, Mo and Ti as an element having almost no solid solubility limit with respect to copper was added. Elements such as Cr diffuse to the surface or grain boundaries of copper or copper alloy powder particles during sintering, and suppress the growth of copper or copper alloy crystal grains that occur with the progress of sintering. To demonstrate. In addition, elements such as Cr serve to reduce voids that are inevitably generated in the sintered body. As a result, the sintered body can be densified and mechanical strength can be improved.

  However, since elements such as Cr do not have good wear resistance, if the amount added exceeds 10% by mass, there is a problem that the wear resistance deteriorates. Further, if it is less than 0.5% by mass, the expected effect cannot be obtained. Therefore, an element particle composed of at least one of Cr, Nb, V, Zr, Mo, and Ti is added to a copper or copper alloy substrate in a range of 0.5 to 10% by mass.

In principle, the solid lubricant is graphite, but it may be one or a mixture of MoS ₂ (molybdenum disulfide), WS ₂ , and BN. It goes without saying that the lubricity can be improved by including a solid lubricant. However, if it is less than 1% by mass, the expected lubricity cannot be obtained. Moreover, when it exceeds 10 mass%, a soft solid lubricant will become excessive and the mechanical strength of copper or a copper alloy will be reduced. Therefore, the solid lubricant is added in the range of 1 to 10% by mass.

Next, a detailed manufacturing method of the solid lubricant-dispersed copper-based sintered layer 39 will be described.
First, powder of copper or copper alloy, 0.5 to 10% by mass of elements consisting of at least one of Cr, Nb, V, Mo and Ti, 1 to 10% by mass of solid lubricant particles, If necessary, add a binder and mix. Then, the mixed powder is placed on the bottom surface of the slider 33 and is pressed and laminated at 3000 to 7000 kg / cm ² . Next, it is put into a sintering furnace 58 and heated at a sintering temperature (730 to 900 ° C.) for a predetermined time (0.5 to 5 hours) in a non-oxidizing atmosphere or a reducing atmosphere. Thereby, a sintered layer can be obtained. The sintered layer is machined and finished to a predetermined thickness (1 mm).

  The obtained solid lubricant-dispersed copper-based sintered layer 39 is preferably impregnated with lubricating oil by a vacuum impregnation method. The impregnated lubricating oil exerts a lubricating action. Provides smooth lubrication with solid lubricants. It is also possible to reduce the amount of solid lubricant added by the amount impregnated with the lubricating oil.

  Although detailed experimental results are omitted, the solid lubricant-dispersed copper-based sintered layer has at least one elemental element composed of Cr, Nb, V, Mo, and Ti in a copper or copper alloy substrate. If 0.5 to 10% by mass and 1 to 10% by mass of solid lubricant particles were dispersed, the same actions and effects as those obtained in the experiment could be confirmed.

  The present invention is suitable for a mold clamping device of an injection molding machine.

It is a side view of a toggle type mold clamping device having a movable platen support mechanism according to the present invention. It is a perspective view of a movable board support mechanism. It is an exploded view of a movable board support mechanism. It is sectional drawing of a movable board support mechanism. It is operation | movement explanatory drawing of a movable board support mechanism. It is a figure explaining the manufacturing process of a slider. It is a figure explaining the basic composition of the conventional technology.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Clamping apparatus, 11 ... Fixed board, 12 ... Pressure receiving board, 13 ... Tie bar, 14 ... Movable board, 30 ... Movable board support mechanism, 31 ... Rail, 32 ... 1st taper surface, 33 ... Slider, 34 ... 1st 2 taper surface, 35 ... block, 36 ... longitudinal part, 37 ... standing part, 38 ... bolt hole, 39 ... solid lubricant-dispersed copper-based sintered layer , 43 ... pin hole provided in block 35 , 44 ... bolt , 45 ... pin holes provided in the bolt 44 , 46, 47 ... a pair of nuts , 49 ... a pin screw .

Claims (3)

A fixed plate, a pressure plate placed opposite to the fixed plate, a plurality of tie bars passed between the pressure plate and the fixed plate, a movable plate guided by these tie bars, and the movable plate moved. Bei to give a and the movable platen support mechanism to be able to support,
The movable platen support mechanism includes a rail disposed on a base of an injection molding machine, a slider that moves on the rail and has a first taper surface on an upper surface, and a second taper surface corresponding to the first taper surface. And a block fixed to the movable platen,
The slider is a spheroidal graphite cast iron product, and includes a longitudinal portion extending along the rail, a standing portion raised from one end of the longitudinal portion, and a bolt hole opened in the standing portion,
A bolt extending in parallel to the rail from the slider is inserted into the bolt hole, and a pair of nuts screwed into the bolt is rotated so that the slider can be moved relative to the block. A mold clamping device for an injection molding machine,
A mold clamping apparatus for an injection molding machine, wherein one end of the bolt is inserted into the block, and one end of the bolt is detachably attached to the block by a pin screw screwed into the block .   At the bottom of the longitudinal part of the slider, 0.5 to 10% by mass of an element particle composed of at least one of Cr, Nb, V, Mo and Ti in a copper or copper alloy substrate, a solid lubricant 2. The mold clamping device for an injection molding machine according to claim 1, wherein a solid lubricant-dispersed copper-based sintered layer in which 1 to 10% by mass of said particles are dispersed is formed.   3. The mold clamping apparatus for an injection molding machine according to claim 2, wherein the solid lubricant-dispersed copper-based sintered layer is impregnated with lubricating oil by a vacuum impregnation method.

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