JP2007061862A - Material extrusion supplying device in metal forming machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain the stability of a material extrusion supplying device while impulsive force is reduced with a bumper by movably arranging the material extrusion supplying device connecting a short columnar state melting cylinder for metal material with the side part of an injection heating cylinder on a stand frame so as to deal with thermal expansion. <P>SOLUTION: A base plate of the material extrusion supplying device is horizontally set on the stand frame of the machine table part of a metal forming machine. The tip end part of the melting cylinder is connected with the side part of the injection heating cylinder including an injection plunger. A plurality of linear guides are set in parallel with the injection heating cylinder at the front and the rear parts on the upper surface of the stand frame. The base plate is movably set in the thermal expanding direction of the injection heating cylinder by engaging guide members at the back surface of the plate with the linear guide. The bumper is arranged in the same direction as that of the linear guide over the base plate and the stand frame side. <P>COPYRIGHT: (C)2007,JPO&INPIT

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 molding machine that melts short columnar metal material and injects it into a mold, a melting device in which a feeding device and an insertion device are connected to the rear of the melting cylinder is installed on the injection device in the same direction. The metal material thrown into the inside is inserted into the melting cylinder by the pusher of the insertion device, and the molten metal produced by the previous melting in the melting cylinder is extruded and supplied to the injection sleeve through the metal material after the semi-molten state. There is something to do.

  In addition, a bar-shaped metal material supply device equipped with a heating cylinder is installed on the injection heating cylinder, and the rod-shaped material dropped and supplied from the supply apparatus to the rear of the heating cylinder is pushed into the heating cylinder by a material pushing rod and heated. There is also a type in which a molten metal or a semi-molten metal material generated by first melting in a cylinder is extruded and fed into an injection heating cylinder via a later metal material.

Further, as a pre-plastic injection device in which a plasticizing device is installed on an injection cylinder, a linear guide member is provided in a longitudinal direction with respect to a rear portion of the injection device at a rear portion of the plasticizing device, and a sliding portion by the linear guide member is used. Some have solved the influence of the difference in thermal expansion between the plasticizing cylinder and the injection cylinder located above and below.
JP 2001-167499 A Japanese Patent Laying-Open No. 2005-40807 JP 2004-34529 A

  In a structure in which a material extrusion supply device equipped with a melting cylinder and a plunger is installed on the injection device like a conventional metal molding machine, the height increases with the increase in size of the molding machine, and material replenishment is inevitably high. It is said that there is a problem with safety because the work is performed at a high place on a heated apparatus. Moreover, since the supply amount of the molten metal material also increases, a melting cylinder capable of inserting a large number of metal materials is required, which increases the overall length on the supply device side and increases the weight of the injection device. It is structurally difficult to install the material extrusion supply device on the injection device. For these reasons, it is considered that there are many problems in increasing the size of the metal forming machine having the conventional structure.

  The above problem can be solved by performing material replenishment and melt supply at the side of the injection apparatus. However, installation of the material extrusion supply device requires means capable of coping with the thermal expansion of both the injection heating cylinder and the melting cylinder. The thermal expansion of the injection heating cylinder can be dealt with by movably installing the material extrusion supply device by adopting a linear guide etc., but the movably installed material extrusion device is in an unstable state and has a slight vibration. However, stress tends to concentrate on the connecting part of the melting cylinder connected to the injection heating cylinder side, and this causes damage to the connecting part, and new phenomenon such as the occurrence of a biting phenomenon of the push-out plunger that moves the inside and backward of the melting cylinder eccentrically. Problems arise.

  The object of the present invention is to enable the material extrusion supply device to be installed on the side of the injection heating cylinder, to solve the above-mentioned conventional problems when the apparatus is installed on the top, and to inject the heating cylinder of the short columnar metal material. Even the material extruding and feeding device connected to the side of the tube can cope with the thermal expansion of the injection heating tube by movability, sufficiently withstands the impact force, and prevents stress concentration on the connecting part of the melting tube Another object of the present invention is to provide a new material extrusion supply device for a metal forming machine having excellent stability.

The present invention according to the above object has a melting cylinder having a heating means on the outer periphery and having a short columnar metal material inlet on the rear part, and a distal end portion is inserted from the rear end to the inner part of the melting cylinder. And a forward / backward drive mechanism on the base plate connected to the rear end of the extrusion plunger. The base plate is mounted on the base side of the base of the metal forming machine. In the material extrusion supply apparatus, which is installed horizontally on the frame and the tip of the melting cylinder is connected to the side of the injection heating cylinder inside the injection plunger,
A plurality of front and rear linear guides are laid parallel to the injection heating cylinder on the upper surface of the base frame, and a guide member on the back of the plate is fitted to the linear guide, so that the base plate can be moved in the direction of thermal expansion of the injection heating cylinder. The shock absorber is provided in the same direction as the linear guide over the base plate and the base frame side.

  In addition, the base plate has a support plate at the rear end of the melting tube having the tip connected to the injection heating cylinder at the front, and the tip is connected to the injection heating cylinder to a support ring provided on the front surface of the support plate. The rear end of the melting tube is slidably inserted with an expansion space between the front surface of the support plate.

  The shock absorber is composed of a hydraulic shock absorber having a constant drag characteristic, and a pair of the shock absorbers are alternately arranged on both sides of the fixing member in parallel, and the fixing member is attached to the base frame side at right angles to the linear guide. Thus, the tip of the piston rod is brought into contact with the symmetrical portion in the plane of the base plate.

  In the above configuration, since the material extrusion supply device moves in the thermal expansion direction of the injection heating cylinder, the stress due to the thermal expansion of the injection heating cylinder does not concentrate on the connecting portion of the melting cylinder connected to the injection heating cylinder. Is absorbed by the movement of the material extrusion supply. As a result, the connecting portion is hardly damaged due to thermal expansion, and the pushing plunger is less likely to bite due to the eccentricity of the melting cylinder. In addition, the rear end of the melting cylinder is slidably inserted into the support ring on the front surface of the support plate with a space for thermal expansion so that the melting cylinder can be freely expanded and contracted by thermal expansion. There will be no eccentricity.

  Further, by providing a shock absorber, even if the material extrusion supply device receives an impact force from the movable direction, the impact force is buffered, so that the impact force is applied to the tip of the melting tube that is fixed to the injection heating tube. There is no concentration. As a result, even if the material extrusion supply device is installed at the machine height on the side of the injection heating cylinder that is susceptible to collisions with other objects, adverse effects due to impact are prevented, so metal forming has been a problem with height It greatly contributes to the enlargement of the machine.

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 perform opening / closing and clamping of the fixed mold 17b of the movable mold 17a of the mold which is divided and attached to the movable board 15 and the mold placement board 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 integrally has a connection block 19 of the material extrusion supply device 3 on the rear side surface protruding from the mold placing plate 13, and means for heating the injection heating cylinder 18 together with the connection block 19 (in the drawing). (Omitted) is provided. The connection block 19 protrudes obliquely rearward, and a supply path 19a that intersects the injection path 18a in the injection heating cylinder at a required angle at the center of the connection block 19 is close to the tip of the injection plunger 20 in the retreat limit position from the block end surface. It is drilled to the wall surface of the 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 paths 19a intersect at an angle of 45 °, but the angle is arbitrary.

  The block end surface of the connection block 19 is a vertical surface perpendicular to the supply path 19a, and a melting cylinder 31 located at the front portion of the material extrusion supply device 3 abuts the front end surface thereof and is connected horizontally by the joint 31a. is there. 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.

  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 provided fixed to the machine base 4, and the connection board 12 and the movable board 15 are provided 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 material 51 and installed on the machine base 5. A base frame 6 of the material extruding and feeding apparatus 3 is provided on the side part between the connecting board 12 and the mold placement board 13 of the machine base 5 so as to protrude, and a base plate 32 is placed on the upper surface plate 61 of the base frame 6. The material extrusion supply device 3 is installed.

  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 center of the upper part of the drive unit installation plate 35 is formed in a recess in which 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 both sides of the driving cylinder. It is installed. The ends of the piston rods 36a, 36a of the hydraulic cylinders 36, 36 are connected to both sides of the pressing plate 38, and the pressing plate 38 is pushed out by the expansion and contraction of the piston rods 36a, 36a and the linear guides 33, 33. 30 is moved forward and backward along the base plate.

  As shown in FIG. 7, an insertion hole 37 a of the extrusion plunger 30 is provided on the plate surface facing the rear end of the melting cylinder of the support plate 37. 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 inserted between the support plate 37 and the plate surface.

  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.

  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 by moving the extrusion plunger 30 forward by a predetermined stroke by the hydraulic cylinder 36. When the pushing plunger 30 moves forward through the set stroke together with the pressing plate 38, the semi-molten metal material M in the melting cylinder 31 is pressed by the stroke. Thus, 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.

  In such a material extruding and feeding apparatus 3, guide members 8 and 8 provided on the front and rear sides and both sides of the back surface of the base plate 32 are fitted to the front and rear linear guides 7 and 7 laid on the upper surface plate 61 of the base frame 6. They are installed on the base frame 6 together. The linear guides 7 and 7 are parallel to the injection heating cylinder 18 and oblique to the base plate 32, the front linear guide is short below both sides in front of the drive unit installation plate 35, and the rear linear guide 7 is Long laid.

  In the material extrusion supply device 3 in which the guide members 8 and 8 of the base plate 32 are fitted to the front and rear linear guides 7 and 7, they are guided by the linear guides 7 and 7 in the thermal expansion direction (arrow direction) of the injection heating cylinder 18. Since it is movable, even if the tip of the melting cylinder 31 is connected to the injection heating cylinder 18, the melting cylinder 31 moves together with the base plate 32 in the thermal expansion direction of the injection heating cylinder 18. As a result, stress due to thermal expansion of the injection heating cylinder 18 does not concentrate on the connecting portion of the melting cylinder 31, and the stress is absorbed by the movement of the material extrusion supply device 3.

  Also in the melting cylinder 31, the support plate 37 whose rear end is fixed to the base plate 32 is slidably supported with the thermal expansion space S, so that even if the tip is constrained by the connection with the injection heating cylinder 18, Since it expands and contracts freely with its tip as a support, there is no eccentricity caused by distortion due to thermal expansion in the melting cylinder 31 and the biting phenomenon of the extrusion plunger 30 hardly occurs even in long-term use. Therefore, even in the material extrusion supply device 3 directly connected to the side of the injection heating cylinder 18, the short columnar metal material M can be melted and extruded smoothly without being affected by the thermal expansion of the injection heating cylinder 18. Can be done.

  A window hole 32c having an inner edge is formed in the plate surface at the center of the base plate 32, and a shock absorber (shock absorber) 9 is provided in the window hole. The shock absorber 9 is a hydraulic shock absorber of a normal structure having a constant drag characteristic, and includes a cylinder 9a having a hydraulic shock absorbing means, a piston rod 9b, and a contact head 9c at the tip of the rod, and a pair of the cylinder 9a and the plate 9 The fixing member 10 is fixed in a penetrating manner, and is arranged in parallel on both sides of the fixing member 10 while changing the direction alternately.

  The shock absorbers 9, 9 are attached to the upper surface plate 61 at a right angle to the linear guides 7, 7 so that the piston rod 9 b is positioned in parallel with the linear guides 7, 7. It is fixed. Also, receiving portions 32d and 32d project from the symmetrical portion of the inner edge of the window hole where the abutting head 9c at the rod tip faces, and the abutting head 9c at the rod tip abuts against the receiving portion 32d, respectively. The impact force that 32 receives from the left-right direction (movable direction) can be buffered. However, with respect to the movement of the material extrusion supply device 3 due to the thermal expansion of the injection heating cylinder 18, the thermal expansion is accompanied by a temperature rise, so that the expansion speed is extremely slow and is below the lower limit value of the set collision speed range. And since the expansion | swelling length is 5-6 mm, since the buffer 9 does not react, it does not become a movable resistance of the material extrusion supply apparatus 3.

  In the material extrusion supply device 3 provided with the shock absorber 9 as described above, even if it receives an impact force from either the left or right direction, the impact force is buffered. The stress due to the acting impact is reduced. As a result, even if the material extrusion supply device 3 is installed at the machine height on the side of the injection heating cylinder that is susceptible to collisions with other objects, no adverse effects due to the collision are prevented, so no particular problem occurs. Greatly contributes to height reduction. The shock absorber 9 also functions as a seismic isolation function when the material extrusion supply device 3 receives a large seismic power.

  The shock absorber is most preferably a hydraulic shock absorber that has a characteristic that the generated drag is constant over the entire stroke of the piston rod when an object collides under the set conditions. Can also be used.

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 of the metal forming machine in the AA line of FIG. It is a side view which shows a part of material extrusion supply apparatus of this invention in a cross section. It is the top view after material extrusion operation | movement which shows a part of material extrusion supply apparatus similarly in a cross section. It is a front view of a material extrusion supply apparatus. It is a vertical rear view of the material extrusion supply apparatus in the BB line of FIG. It is a half vertical cross-sectional side view of the upper part of the support plate showing the support state of the rear part of the melting cylinder. It is a top view of a pair of buffer which shows the half part of a fixing member in a section.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Clamping apparatus 2 Injection apparatus 3 Material extrusion supply apparatus 4 Machine base 6 Unit frame 7 Linear guide of base plate 8 Guide member of base plate 9 Shock absorber 10 Fixing member of shock absorber 13 Mold placement plate 18 Injection heating cylinder 20 Injection plunger 30 Extrusion Plunger 31 Dissolving cylinder 32 Base plate 32d Receiving portion 33 Linear guide 35 Drive portion installation plate 36 Hydraulic cylinder 36a Piston rod 37 Support plate 38 Press plate

Claims (4)

A melting cylinder having a heating means on the outer periphery and having a short columnar metal material inlet on the rear part, and a tip part is inserted from the rear end to the inside of the melting cylinder, and the metal in the melting cylinder is inserted by the tip part. It consists of an extruding plunger that pushes and moves the material forward, and an advancing and retracting drive mechanism on the base plate that connects the rear end of the extruding plunger. The base plate is installed horizontally on the base frame on the side of the base of the metal forming machine. In the material extrusion supply device in which the tip of the melting cylinder is connected to the side of the injection heating cylinder inside the injection plunger,
A plurality of front and rear linear guides are laid parallel to the injection heating cylinder on the upper surface of the base frame, and a guide member on the back surface of the plate is fitted to the linear guide, so that the base plate is in the same direction as the thermal expansion direction of the injection heating cylinder. A material extrusion supply device for a metal forming machine, wherein a shock absorber is provided in the same direction as the linear guide over the base plate and the base frame side.   The base plate has a support plate at the rear end of the melting tube connected to the tip of the injection heating cylinder at the front, and a melting ring with the tip connected to the injection heating tube on a support ring provided on the front surface of the support plate. 2. The material extrusion supply apparatus for a metal forming machine according to claim 1, wherein the cylinder rear end is slidably inserted with an expansion space between it and the front surface of the support plate.   2. The material extrusion supply device for a metal forming machine according to claim 1, wherein the shock absorber is a hydraulic shock absorber having a constant drag characteristic.   A pair of the hydraulic shock absorbers are alternately arranged in parallel on both sides of the fixing member, the fixing member is mounted on the side of the base frame at a right angle to the linear guide, and the tip of the piston rod is placed in the plane of the base plate. 4. The material extrusion supply device for a metal forming machine according to claim 3, wherein the material extrusion supply device is in contact with each symmetrical portion.

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