JP4504282B2 - Material extrusion feeder for metal forming machine - Google Patents

Description

  The present invention relates to a material extrusion supply apparatus for a metal forming machine that melts a short columnar low melting point metal material such as magnesium or an alloy thereof and injects it into a mold.

  As a material extrusion supply device of a molding machine that melts a short columnar metal material and injects it into a mold, a metal material provided in the supply device is provided with a supply device and an insertion device at the rear of the melting cylinder of the melting device Is inserted into a melting cylinder by a pusher of an insertion device, and the molten metal produced by first melting in the melting cylinder is extruded and supplied to the injection sleeve through a later semi-molten metal material.

In addition, a rod-shaped metal material supply device is provided at the rear of the heating cylinder, and the rod-shaped material dropped and supplied from the supply device to the rear of the heating cylinder is pushed into the heating cylinder by the material pushing rod and melted first in the heating cylinder. In some cases, the molten metal or the semi-molten metal material produced by extrusion is extruded and fed into the injection heating cylinder through the later metal material.
JP 2004-167499 A Japanese Patent Laying-Open No. 2005-40807

  In a device that melts by inserting a short columnar or rod-shaped metal material into a melting cylinder or a heating cylinder (hereinafter referred to as a melting cylinder) and extruding it to the melting cylinder with a pusher or rod (hereinafter referred to as a pusher), the movement stroke of the pusher It is said that it is only necessary to slightly exceed the total length of one metal material. Within this range, the length of the melting cylinder and pusher can be shortened, so that the entire apparatus can be made compact. However, since the stroke of the pusher does not reach the tip of the melting cylinder, the metal material melted and left in the melting cylinder cannot be pushed out by the pusher and completely discharged. For this reason, the molding is completed while the molten material remains in the melting cylinder, and the next molding is started after the remaining amount is melted. Therefore, there is a problem that it takes time to start molding.

  The present invention has been conceived in order to solve the above-described conventional problems, and the object thereof is to adopt an extension rod without changing the moving stroke of an extrusion plunger for extruding and feeding a metal material to an injection heating cylinder. Providing a new material extrusion supply device for metal forming machines that can discharge the metal material in the melting cylinder with an extrusion plunger when necessary, thereby making maintenance easier and reducing the time until the next molding start. There is to do.

The invention according to above-mentioned object, the heating means on the outer periphery, have a charging port of a short columnar metal material on the back, by connecting the distal end surface side of the connection block of the injection heating cylinder, an injection in the connection block A melting cylinder connected to the supply path on the roadside, a push-out plunger that inserts a leading end into the inside from the rear end of the melting cylinder, and pushes and moves the metal material in the melting cylinder forward by the leading end, and a support for the melting cylinder A base plate that is erected, a pressing plate that is provided on the base plate so as to be movable forward and backward, and that is detachably connected to the rear end of the extrusion plunger, and is interposed between the pressing plate and the extrusion plunger, and is connected to both. and consists an extension rod to be used, in its extension rod, having a length to move the whole of the metallic material of the melting cylinder and the supply passage position of the tip of the extrusion plunger from the forward limit position until it is discharged to the exit path , Is that.

The pressing plunger and the extension rod have a connecting annular groove that fits with the split ring of the pressing metal on the pressing plate on the outer periphery of the rear end, and the pressing plunger has a screw hole for connecting the extension rod at the rear end. The extension rod has a connecting screw shaft that is screwed into the screw hole of the pressing plunger at the tip .

In addition, the pressing plunger includes the extension rod that is hollow in the shaft portion except for the front end portion and is housed in the shaft portion from the rear end opening, and a fastener for the extension rod by a pair of half members is attached to the rear end of the shaft portion with a bolt. freely have, the pressing the extension rod and protrusion and engaging match that ring-shaped groove projecting from the inner periphery of the fastener on the outer periphery of the distal end portion and the rear end portion, which is formed on the outer periphery of the rear end Each has an annular groove for connection with the plate, and the pressing plunger is detachably connected to the pressing plate by the annular groove at the rear end thereof .

  In the above configuration, the extension rod can be used to change the tip position of the push plunger further from the forward limit position by the length of the extension rod without changing the movement stroke of the push plunger. Thus, the molding operation can be ended or stopped, thereby shortening the start-up time at the next molding start and increasing the molding efficiency. In addition, since it is not necessary to provide an extra length of the extrusion plunger in order to enable discharge by the extrusion plunger, there is no change in the length of the apparatus, and it is possible to make the material extrusion supply device having a discharge function compact. it can.

  The extension rods can be added as necessary.In addition, the extension plunger is removed from the pressing plate after the set stroke is moved, and the pressing plate is moved backward to make a space suitable for the length of the extension rod. After that, it is only necessary to insert an extension rod between the extruding plunger and the pressing plate and to connect both, and the extension rod can be removed in the same manner, so that it does not take a long time to add the extension rod.

In the figure, 1 is a mold clamping device, 2 is an injection device, and 3 is a material extrusion supply device.
In the mold clamping device 1, a pressure receiving plate 11, a connecting plate 12 provided facing the pressure receiving plate 11 at a required interval, and a mold placing plate 13 disposed at the center between the two plates are inserted into the four corners. A clamp plate 14.14 is connected and provided, and a movable platen 15 is inserted between and supported by the clamp shaft 14.14 between the pressure receiving plate 11 and the mold placement plate 13 so as to freely advance and retract. A mold clamping ram 16b of a mold clamping mechanism 16 in which a cylinder 16a is integrally provided at the center of the pressure receiving board 11 is connected to the back surface of the movable board 15, and the movable board 15 is expanded and contracted by the mold clamping ram 16b. Is configured to open and close and mold clamping of the movable mold 17a and the fixed mold 17b of the mold which are separately attached to the movable platen 15 and the mold placing plate 13 by moving forward and backward.

  An injection cylinder 21 of the injection device 2 is fixed on the outer panel surface of the connecting board 12 by inserting a piston rod 22 through a hole formed in the connecting board 12 so as to be able to advance and retract. In addition, an injection heating cylinder 18 having both ends opened on the mold placing plate 13 is connected to a hole drilled in the plate body by providing a heat insulating material around the die mounting surface until the tip slightly protrudes from the plate mounting surface side. And is fastened with a split ring and a bolt fitted around the tip. In the injection heating cylinder 18 in which only the tip portion is fixed to the mold placing plate 13 and the others are in a free state, the thermal expansion is performed in the axial direction without being restrained by the mold placing plate 13.

The injection heating cylinder 18, the rear side projecting from the mold置盤13, a connecting block 19 of the material extruding supply equipment 3 together, means (Fig for heating the injection heating tube 18 with the connection block 19 Is omitted). The connection block 19 protrudes obliquely rearward, and a supply passage 19a that is obliquely connected to the injection center 18a in the injection heating cylinder at a required angle at the center of the connection block 19 extends from the block end surface to the tip of the injection plunger 20 at the retreat limit position. It is drilled to the wall surface of the adjacent injection path 18a. Although not shown in the figure, the injection heating cylinder 18 is connected to a gas supply means for making the injection path 18a an inert gas atmosphere such as argon gas. In the figure, the supply path 19a is obliquely connected to the injection path 18a at an angle of 45 °, but the angle is arbitrary.

  The block end surface is a vertical surface perpendicular to the supply path 19a, and a melting cylinder 31 positioned at the front of the material extrusion supply device 3 is in contact with the front end surface of the block and is connected horizontally by a joint 31a. The melting cylinder 31 has a length capable of accommodating 3 to 5 metal materials M (magnesium alloy) having a length of 300 mm and a diameter of 60 mm including a supply path 19 a including a short columnar (also referred to as a rod) metal material M. An extrusion plunger 30 for extruding the material is inserted into this. In addition, a metal material M charging port 31b is opened long in the axial direction on the upper rear side, and a band heater 31c is attached around the cylindrical body excluding the charging port 31b.

  An injection plunger 20 having a flat front end surface is inserted into the injection path 18 a from the rear end of the injection heating cylinder 18. As shown by the chain line in FIGS. 4 and 12, the injection plunger 20 has a plunger tip 20a having a diameter that is substantially the same as the inner diameter of the injection path 18a within a slidable range. The molten metal material that backflows from the clearance is reduced. Further, the diameter of the intermediate portion 20b located at the opening of the supply passage 19a in the most advanced state is formed to be slightly smaller in diameter than the plunger tip portion 20a, and further, the other plunger shaft portion is formed to be smaller in diameter than the intermediate portion 20b, The molten metal material around the small-diameter shaft portion that has flowed back from the clearance due to the step formed there is scraped from the opening at the rear end of the injection heating cylinder 18 when the plunger is retracted, so that the sliding resistance due to the molten metal material is reduced. It is.

The mold clamping device 1 and the injection device 2 are installed on respective machine bases 4 and 5 connected to each other. In the mold clamping device 1, the pressure receiving plate 11 and the mold placing plate 13 are fixedly installed on the machine base 4, and the connection board 12 and the movable board 15 are installed without being fixed to the machine base 4. In addition, the injection device 2 has the hydraulic drive unit 23 placed and fixed on the machine base 5, and the front part of the injection cylinder 21 is supported by the support member 52 and installed on the machine base 5. A base frame 7 of the material extrusion supply device 3 is provided so as to protrude from a side portion between the connecting board 12 and the mold placement board 134 of the machine base 5, and a base plate 32 is placed on the upper surface plate 6 of the base frame 7. The material extrusion supply device 3 is installed.

  A plurality of front and rear linear guides 61 are laid in parallel to the injection heating cylinder 18 on the upper surface plate 6 of the material extruding and feeding apparatus 3. Is movably mounted on the top plate 6. The base plate 32 is positioned at a 45 ° angle with respect to the injection heating cylinder 18 and horizontally on the extended line of the supply path 19a in the connection block, and is thermally expanded together with the melting cylinder 31 corresponding to the thermal expansion of the injection heating cylinder 18. It moves in the direction.

  The base plate 32 is provided with an advance / retreat drive mechanism for the push-out plunger 30, and a support 32 a for the melting cylinder 31 is erected on the base plate in front of the advance / retreat drive mechanism. The advancing / retracting drive mechanism is hydraulically driven, and is a pair of left and right linear guides 33, 33 laid on the upper surface of the base plate 32 in parallel with the melting cylinder 31, and a fixed base plate 34a fitted to both of the linear guides 33, 33. , 34a, a drive unit installation plate 35 and a support plate 37 at the rear end of the melting cylinder, which are arranged side by side on the front portion of the base plate 32, and a movable base in which guide members on the back surface are fitted to both linear guides 33, 33. It has a pressing plate 38 attached to the plates 34b, 34b and provided on the base plate so as to be able to advance and retreat. The rear end of the pushing plunger 30 is detachably connected to the center of the pressing plate 38.

  The drive unit installation plate 35 is mounted and fixed in front of the fixed base plates 34a and 34a, and the support plate 37 is mounted and fixed in parallel to the rear side, both of which are provided by a member 32b attached to the front surface of the drive unit installation plate 35. It is fixed to the base plate 32. Further, the upper center of the drive unit installation plate 35 is formed in a recess where the rear part of the melting cylinder is located at an interval, and a pair of hydraulic cylinders 36, 36 are parallel to the melting cylinder 31 on the both sides and are long in the front and horizontally. It is installed. An insertion hole 37 a of the extrusion plunger 30 is provided on the plate surface of the support plate 37 facing the rear end of the melting cylinder. Around the front surface of the insertion hole 37a, a rear end support ring 37b of the melting cylinder 31 is attached with a vertical adjustment bolt 37c, and the rear end of the melting cylinder 31 is located on the rear end support ring 37b beyond the recess. However, a thermal expansion space S is provided between the support plate 37 and the plate surface so as to be slidable.

  Piston rods 36a, 36a of the hydraulic cylinders 36, 36 are connected to both sides of the pressing plate 38 with their rear ends movably pinned up and down, and the piston rods 36a, 36a extend and contract and linear guides. 33, 33, the pressing plate 38 moves forward and backward on the base plate to the support plate 37 together with the pushing plunger 30. The movement stroke of the pressing plate 38 is set to be slightly longer than the length of two metal materials M (600 mm) in the drawing, and the movement stroke waits at the retreat limit position after the insertion port 31b. The extrusion plunger 30 is moved forward in a plurality of times together with the extruded plunger 30, and each time the forward movement is performed, the extrusion plunger 30 sequentially pushes the short columnar metal material M introduced into the melting cylinder toward the melting cylinder, and the other half melts. The metal material can be extruded from the supply path 19a to the injection path 18a.

  The extrusion plunger 30 has an annular groove 30b on the outer periphery of the rear end, and has a screw hole 30c in the rear end in the axial direction. As shown in FIG. 8, the pushing plunger 30 is connected to the pressing plate 38 by forming the upper portion of the pressing plate 38 provided with the hole 38a into a thin plate and forming a step portion on the rear surface side. The stopper plate 38b is fixed, and the receiving cylinder 38c at the center of the stopper plate is inserted into the hole 38a. On the other hand, an inner presser fitting 39a having a flange around one end of the stopper ring is fitted into the rear end of the plunger to insert the annular groove 30b. After fitting the split ring 39b and inserting the rear end of the plunger together with the split ring 39b into the receiving cylinder 38c, the outer opening of the contact plate 38b is closed by the outer presser fitting 39c to receive the retaining ring of the inner presser fitting 39a. The inner and outer presser fittings 39a and 39c are fitted together with a cylinder 38c and fastened together with a set screw. As a result, the pushing plunger 30 is connected to the pressing plate 38 via the contact plate 38b by the inner and outer holding metal fittings 39a, 39c and the split ring 39b, and can be removed from the pressing plate 38 only by removing the set screw. .

FIG. 9 shows an extension rod 40 of the extrusion plunger 30 having a screw shaft 40a at the tip and an annular groove 40b for connection around the outer periphery of the rear end. This extension rod 40 is added to the push-out plunger 30 and used when all the metal material in the melting cylinder 31 is discharged from the supply path 19a to the injection path 18a. The splicing is performed by screwing the screw shaft 40a into the screw hole 30c of the pushing plunger 30 and connecting the rear end to the pressing plate 38. As shown in FIG. 14, the tip 30a of the push-out plunger 30 reaches the opening end of the supply passage 19a in contact with the injection passage 18a by the addition. Further, the pressing plate 38 and the extension rod 40 can be connected in the same manner as in the case of the pushing plunger 30.

FIG. 10 shows another embodiment of the pushing plunger 30 in which the extension rod 40 is housed. The push-out plunger 30 is formed by hollowing the shaft portion excluding the front end portion 30a, and a fastening member 41 made up of a pair of half members having a protrusion 41a projecting at the inner periphery at the rear end of the shaft portion is detachable by bolts. It is installed. In addition to the connecting annular groove 40b formed on the outer periphery of the rear end, the extension rod 40 has engaging annular grooves 40c and 40d on the outer periphery of the front end portion and the rear end portion.

  The extension rod 40 is accommodated in the pusher plunger 30 until the rear annular groove 40d is positioned on the protrusion 41a of the stopper 41, and the annular groove 40d and the protrusion 41a are fitted together with the pusher plunger 30. The rear end that is integrally connected and protrudes from the stopper 41 constitutes a connecting portion between the pushing plunger 30 and the support plate 38. Further, when necessary, the stopper 41 is removed, the extension rod 40 is pulled out until the annular groove 40c at the front end is exposed from the rear end of the plunger, and the protrusion 41a is fitted into the annular groove 40c so that the stopper 41 is attached around the rod. Then, the stopper 41 is fixed again to the rear end of the plunger. As a result, the extension rod 40 is fixed to the stopper fitting 41 and is continuously connected to the rear end of the push-out plunger 30, and the length of the push-out plunger 30 is extended as shown in FIG.

  In the material extrusion supply apparatus 3 configured as described above, when the material is a magnesium alloy and the short columnar metal material M that exhibits thixotropy by semi-melting, the heating temperature of the melting cylinder 31 is such that the metal material M is in a semi-molten state (550 °). The temperature is set to ˜590 ° C.). Unlike the case where the metal material M in a semi-molten state is completely melted, the whole is expanded and uniformly softened without flowing into the injection path 18a even when the melting cylinder 31 and the supply path 19a are horizontal, It has a short columnar shape.

  The extrusion supply of the semi-molten metal material to the injection path 18a is performed when the tip 20a of the injection plunger 20 is in the retracted position and the supply path 19a communicates with the injection path 18a. The operation is performed by reducing the 36 piston rods 36a by a preset stroke. As the piston rod 36a is reduced, the pushing plunger 30 moves forward along the set stroke together with the pressing plate 38, and presses the semi-molten metal material M in the melting cylinder 31 by the stroke. As a result, the amount of the metal material M that has been pressed and moved is extruded and supplied from the supply path 19a to the injection path 18a as one shot. Therefore, the material supply amount in the injection path 18 a is measured by the movement amount of the push plunger 30.

  When the push-out plunger 30 reaches the forward limit position, the hydraulic cylinder 36 is switched to the extension operation of the piston rod 36a, and the pressing plate 38 moves backward together with the push-out plunger 30 to the original reverse limit position. By this backward movement, the tip 30a of the push plunger 30 is positioned at the rear end of the melting cylinder after the inlet 31b of the melting cylinder 31, so that a new metal material M can be charged.

  The supply of the replenishment material is preferably performed when the injection plunger 20 is stopped at the most advanced position and the opening of the supply passage 19a is blocked by the intermediate portion 20b. It is not necessary to replenish material every shot, and there will be no material shortage if it is performed after a replenishment space for at least one metal material is generated in the melting cylinder. After the insertion, the hydraulic cylinder 36 is contracted and the pushing plunger 30 is moved forward until the plunger tip 30a contacts the metal material M, and the metal material M is pressed by the tip.

  When it is necessary to discharge all of the semi-molten material in the melting cylinder 31 and the supply passage 19 a due to the end or stop of the molding operation, the extension rod 40 is added after the push-out plunger 30. This addition can be performed after moving the pressing plate 38 and the pushing plunger 30 through a moving stroke set in advance from the length of the extension rod 40 employed therein.

  After stopping the movement, first, the fastening bolts of the inner presser fitting 39a and the outer presser fitting 39c connecting the pusher plunger 30 and the pressing plate 38 are removed, and the outer presser fitting 39c is removed from the contact plate 38b. When the hydraulic cylinder 36 is extended and the pressing plate 38 is moved backward, the rear end of the push-out plunger 30 comes out of the receiving cylinder 38c together with the inner presser fitting 39a and the split ring 39b around the rear end, and presses as shown in FIG. Only the plate 38 moves to the original retracted position, leaving a space adapted to the length of the extension rod 40.

  Next, the prepared extension rod 40 is screwed to the rear end of the push plunger 30 and added, and the rear end of the extension rod is connected to the pressing plate 38 by the same means as the push plunger 30. As a result, the movement stroke of the pressing plate 38 does not change, but in the push-out plunger 30, the length of the extension rod is added to the movement stroke, and as shown in FIG. 14, the tip 30a protrudes from the forward limit position to the injection path 18a. The supply path 19a is moved to such a point. As a result, all the semi-molten materials in the melting cylinder 31 and the supply path 19a can be discharged from the injection path 18a by reciprocating the extrusion plunger 30 and the injection plunger 20 alternately. When the discharge operation is completed, the extension rod 40 is returned from the retreat limit position, and the extension rod 40 is removed from the push plunger 30 and the press plate 38. Thereafter, the press plate 38 is moved forward to the rear end of the push plunger 30 and reconnected.

  FIG. 15 shows an embodiment of another forward / backward drive mechanism of the pressing plate 38 using the electric motor 8 as a driving source. The front fixing plate 81 and the rear fixing plate 82 provided on the base plate 32 are arranged on both sides. The pressing plate 38 of the extruding plunger 30 disposed between the plates, a pair of guide rods 84 that pass through the pressing plate 38 and extend across the diagonal corners of the two plates, and a ball nut provided in the pressing plate 38 The electric motor attached to a pair of ball screw shafts 86 screwed into the member 85 and rotatably provided over the other diagonal corners of the two plates, and the rear fixed plate 82 rotating the ball screw shafts 86. 8 and a drive belt 87 that simultaneously transmits the rotation of the electric motor 8 to a pair of ball screw shafts 86.

  The melting cylinder 31 is disposed horizontally on the front surface of the disk body with the rear end supported by the front fixed platen 81, and the front end 30a of the push-out plunger 30 is inserted into the rear end. The pusher plunger 30 moves forward in the melting cylinder by the rotation of the ball screw shaft 86 and the forward movement of the pressing plate 38 by the guide rod 84, and in the same way as in the embodiment driven by the hydraulic drive, semi-molten in the melting cylinder. The metal material in a state is extruded and supplied to an injection path (not shown).

It is a top view which shows a part of metal forming machine provided with the material extrusion supply apparatus of this invention in a cross section. It is a rear view in the AA line of FIG. It is a side view of the material extrusion supply apparatus of this invention. It is a top view which shows a part same as the above in a cross section. It is a front view of a material extrusion supply apparatus. It is a half vertical cross-sectional side view of the upper part of the support plate which shows the support state of the melting | dissolving cylinder rear part. It is a rear view of a pressing plate. It is a vertical side view of the upper part of the press plate which connected the extrusion plunger. It is a side view of an extension rod. It is a vertical side view of the extrusion plunger which accommodated the extension rod. It is a vertical side view of an extrusion plunger at the time of extending an extension rod same as the above. It is a top view which shows a part of material extrusion supply apparatus which shows the advance limit position of an extrusion plunger in a cross section. It is a top view which shows a part of material extrusion supply apparatus at the time of extension rod addition, in a cross section. It is a top view which shows a part of material extrusion supply apparatus at the time of material discharge | emission in a cross section. It is a side view of the extrusion drive means which uses the electric motor of a material extrusion supply apparatus as a drive source. It is a rear view same as the above.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Clamping apparatus 2 Injection apparatus 3 Material extrusion supply apparatus 4 Machine stand 6 Top plate 7 Stand frame 13 Mold placement board 18 Injection heating cylinder 18a Injection path 19 Connection block 19a Supply path 20 Injection plunger 30 Extrusion plunger 30b Annular groove at the rear end 30c Screw hole 31 Melting cylinder 32 Base plate 32a Melting cylinder support 33 Linear guide 34a Fixed base plate 34b Movable base plate 35 Drive section installation plate 36 Hydraulic cylinder 36a Piston rod 37 Support plate 38 Press plate 40 Extension rod 40a Screw shaft 40b at the tip Rear end annular groove

Claims (3)

Heating means around the periphery, have a charging port of a short columnar metal material on the back, by connecting the distal end surface side of the connection block of the injection heating cylinder, connected to the supply passage of the injection roadside unit in the connection block A melting cylinder, an extrusion plunger that inserts a tip portion into the inside from the rear end of the melting cylinder, and presses and moves the metal material in the melting cylinder toward the tip by the tip, and a base plate on which a support of the melting cylinder is erected, A pressing plate which is provided on the base plate so as to be movable forward and backward, and is detachably connected to the rear end of the extrusion plunger; and an extension rod which is interposed between the pressing plate and the extrusion plunger and used in combination with both. Consists of
Its extension rod is a metal forming machine of the material extrusion characterized by having a length to move the whole of the metallic material of the melting cylinder and the supply path tip position of extrusion plunger from the forward limit position until it is discharged to the exit path Feeding device. The pressing plunger and the extension rod have an annular groove for connection that fits with the split ring of the pressing metal on the pressing plate on the outer periphery of the rear end, and the pressing plunger is for connecting the extension rod in the rear end. 2. The material extruding and feeding apparatus for a metal forming machine according to claim 1 , wherein the extension rod has a screw shaft for connection that engages with a screw hole of a pressing plunger at a tip thereof. The pressing plunger is provided with the extension rod that is hollow in the shaft portion except for the front end portion and accommodated in the shaft portion from the rear end opening, and is capable of attaching and detaching an extension rod stopper with a pair of half members at the rear end of the shaft portion with bolts. to have, the extension rod and the ring-shaped groove that match engagement with protrusions projecting from the inner periphery of the fastener on the outer periphery of the distal end portion and a rear end, the pressing plate formed on the outer periphery of the rear end 2. A material extrusion supply device for a metal forming machine according to claim 1, wherein said pressing plunger is detachably connected to the pressing plate by an annular groove at the rear end thereof. .

Images