WO2011115276A1 - 金型内部情報計測センサー - Google Patents
金型内部情報計測センサー Download PDFInfo
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- WO2011115276A1 WO2011115276A1 PCT/JP2011/056658 JP2011056658W WO2011115276A1 WO 2011115276 A1 WO2011115276 A1 WO 2011115276A1 JP 2011056658 W JP2011056658 W JP 2011056658W WO 2011115276 A1 WO2011115276 A1 WO 2011115276A1
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- WIPO (PCT)
- Prior art keywords
- pressure
- cavity
- rod
- gas
- sensor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
- B22D17/20—Accessories: Details
- B22D17/32—Controlling equipment
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D2/00—Arrangement of indicating or measuring devices, e.g. for temperature or viscosity of the fused mass
- B22D2/006—Arrangement of indicating or measuring devices, e.g. for temperature or viscosity of the fused mass for the temperature of the molten metal
Definitions
- the present invention detects the resin pressure, gas pressure, or melt temperature of a molten metal in a die of a die casting machine for pressure-casting a metal material such as an aluminum alloy or magnesium, or a molten metal in a mold for resin molding.
- the present invention relates to a mold internal information measuring sensor suitable for determining the quality of cast and resin molded products.
- the quality of the die-cast product is affected by the injection speed and injection pressure when filling the molten metal into the mold.
- the molten metal is supplied to the plunger sleeve and the plunger is driven at a low injection speed to avoid entrapment of air of the molten metal, etc. Move forward until you are full.
- the plunger moves to a position where the front end of the molten metal reaches the mold gate, the plunger is switched to a high injection speed and driven to rapidly fill the molten metal in the mold cavity.
- the pressure of the plunger is increased to press the molten metal.
- the die used for the die casting machine is constituted by a movable die 1a and a fixed die 1b as shown in FIG.
- the cavity 2 formed by the two dies 1a and 1b is provided with a pouring port 3a, a runner 3b and a sprue 3c following the injection cylinder, and further degassing gas 4 in the cavity 2 and the pool 5 It is provided.
- FIG. 9 is a cross-sectional view showing how the molten metal is filled in the cavity 2 of the die in the die casting machine.
- a predetermined amount of molten metal ML is supplied using a ladle through the pouring port 6a of the plunger sleeve 6.
- This figure shows a state in which the plunger 7 is driven at a low speed and injected from a state in which a predetermined amount of molten metal ML is supplied into the plunger sleeve 6.
- the gas G is present in front of the plunger tip 7a together with the molten metal ML, and the gas G is also present in the runner 3b which leads the molten metal ML in the plunger sleeve 6 to the cavity 2.
- a position FP shown in FIG. 9 is a point at which the plunger 7 is switched from low speed movement to high speed movement.
- FIG. 10 is a diagram showing the change waveforms of the injection speed J, the injection pressure K, the metal pressure L, the gas pressure M, and the metal temperature T of the plunger 7 at the time of injection molding along time axis.
- the injection pressure takes a substantially constant value while the plunger 7 is moving at a high injection speed. Thereafter, the filling pressure is rapidly increased and held by the pressure increase.
- the metal pressure hardly rises, and when the molten metal ML in the cavity 2 fills up, the pressure almost rises to the machine pressure, but the molten metal in the sprue 3c solidifies Start the descent.
- a solidified film is formed in the molten metal when the oxide film or the plunger sleeve is filled.
- the molten metal ML reaches the sprue 3c and the solidified film or oxide film or the like crushed in the injection operation gets caught in the gate part of the inlet during filling, the supply of hot water is cut off, and the molten metal in the cavity 2 shown in FIG.
- the metal pressure does not rise, and a curve B and a curve C are drawn along the way, and it does not reach the normal metal pressure curve A, and the molded product is not pressurized, resulting in a defective product with many air bubbles remaining inside. .
- the yield can be improved. Therefore, when using a die casting machine to inject molten metal such as molten aluminum alloy into a cavity formed in the mold and casting a cast product, the pressure of the molten metal in the mold at the time of injection and There is a need to measure the temperature of the molten metal and the gas pressure that the gas in the cavity compresses due to the filling of the molten metal, and the reliable release of the gas in the cavity is important for stable production of quality.
- molten metal such as molten aluminum alloy
- the necessity of detecting metal pressure, temperature, and gas pressure in such a die casting machine is the same as in the case of resin molding using a mold.
- the present invention is suitable for pressure-filling a molten metal such as metal or resin which has been subjected to constant water supply into a plunger sleeve into a cavity of a mold with a plunger, and judging the quality of a pressure cast product for casting and forming a product. It is an object of the present invention to provide a mold internal information measuring sensor.
- a sensor for measuring internal information of a mold according to the present invention is disposed at a tip of a rod-shaped casing which can be attached to a mounting hole which is bored in a die and opened in a cavity And a porous filter capable of conforming the tip surface to the mold cavity surface and capable of separating the gas from the molten metal, and a chamber for introducing a cavity gas provided at the back of the porous filter and introduced through the porous filter And a gas pressure sensor for detecting the pressure in the gas introduction chamber, and the gas pressure in the cavity can be detected.
- a rod-shaped casing which can be installed in a mounting hole which is bored in a mold die and opened in a cavity, and which is disposed at the tip of the rod-shaped casing and can match the tip surface with the mold cavity surface
- a porous filter capable of separating gas from molten metal
- an introduction chamber for a cavity gas provided at the rear of the porous filter and introduced through the porous filter
- a gas pressure sensor for detecting the pressure in the gas introduction chamber
- a pressure transmitting rod which is inserted into the rod-shaped casing and movable in its axial direction and can match the end face with the mold cavity face, and fixedly held facing the rear end of the pressure transmitting rod
- a pressure sensor capable of detecting the pressure of the molten metal injected into the cavity, and capable of detecting the gas pressure in the cavity and the molten metal pressure in the cavity It is a mold internal information measuring sensor, characterized in that to composed.
- a rod type casing which can be installed in a mounting hole which is drilled in a mold die and opened in a cavity, and which is disposed at the tip of the rod casing and can match the tip surface with the mold cavity surface
- a separable porous filter, an introduction chamber for a cavity gas provided behind the porous filter and introduced through the porous filter, and a gas pressure sensor for detecting the pressure in the gas introduction chamber is a separable porous filter, an introduction chamber for a cavity gas provided behind the porous filter and introduced through the porous filter, and a gas pressure sensor for detecting the pressure in the gas introduction chamber.
- a rod-shaped casing which can be installed in a mounting hole drilled in a mold die and opened in a cavity, and disposed at the tip of the rod-shaped casing to match the tip surface to the mold cavity surface
- a gas pressure sensor for detecting the pressure of a porous filter capable of separating a gas from molten metal, an introduction chamber of a cavity gas provided behind the porous filter and introduced through the porous filter, and the gas introduction chamber
- a pressure transmitting rod which is inserted into the rod-shaped casing and movable in the axial direction and can match the tip end face with the mold cavity face, and fixed facing the rear end of the pressure transmitting rod
- a pressure sensor capable of detecting the pressure of the molten metal that is held and injected into the cavity, and is attached to a pore formed at a central portion of the pressure transmission rod;
- a mold having a temperature sensor comprising a thermocouple having a detection end on the rod tip end side of the hole, wherein the gas pressure in the cavity,
- a fixing unit including a bite joint slidably attached to the outer periphery of the rod-shaped casing and a set screw to the mounting hole, and rod insertion according to the die thickness
- the length may be adjustable.
- compressed air supply means may be connected to the gas introduction chamber so that purge air can be supplied to the porous filter.
- a sensor for measuring internal information of a mold according to the present invention can be attached to a mounting hole drilled in a mold die and opened in a cavity, and has a rod-shaped casing longer than the thickness of the mold die, and a base of the rod-shaped casing.
- a sensor block provided at the end, a porous filter disposed at the tip of the rod-shaped casing and capable of matching the tip surface to the mold cavity surface and capable of separating gas from molten metal, and formed on the sensor block
- the introduction chamber of the cavity gas introduced through the porous filter, and the gas pressure sensor mounted on the sensor block for detecting the pressure of the gas introduction chamber, and the gas pressure in the cavity can be detected. It is characterized by
- the senor for measuring internal die information can be attached to a mounting hole drilled in a die and opened in a cavity, and has a rod-shaped casing longer than the thickness of the die, and the rod-shaped casing
- a sensor block provided at the proximal end of the rod, a porous filter disposed at the tip of the rod-shaped casing, capable of matching the tip surface with the mold cavity surface, and capable of separating gas from molten metal;
- a gas pressure sensor mounted on the sensor block for detecting the pressure of the gas introduction chamber, and inserted into the rod-shaped casing.
- a pressure transmitting rod movable in the axial direction and capable of conforming to the end face to the mold cavity face, and the rear of the pressure transmitting rod A pressure sensor which is held between the sensor block and facing the sensor block and can detect the pressure of the molten metal injected into the cavity, and can detect the gas pressure in the cavity and the molten metal pressure in the cavity It features.
- the porous filter has a ring shape, and a pressure transmission rod is inserted through the center of the ring, and a pore reaching the tip of the rod is formed in the center of the pressure transmission rod, and a thermocouple is disposed inside do it.
- the molten metal supplied to the plunger sleeve in a fixed amount of hot-water supply is pressure-filled with the molten metal into the mold by the plunger, and used in a pressure casting apparatus for casting a product. can do.
- the broken solidified pieces are caught on the gate by measuring the metal pressure on the mold side, it is detected as a pressure abnormality and quality control can be performed by monitoring the pressure drop rate due to the solidification contraction.
- the gas entrainment of molten metal coming from the gate by controlling the pressure of the gas (mixed gas such as air and water vapor) in the cavity (the type of product part) and the vacuum degree in vacuum die casting. it can. Furthermore, since the molten metal entering from the cavity solidifies instantaneously, the temperature of the molten metal can be controlled by measuring the temperature of the mold at this time.
- the gas mixed gas such as air and water vapor
- the die casting production site has poor environment, and these three sensors can be included in a single sensor, and the tip of the pin can be easily attached and removed to the mold surface (such as the back of the product), resulting in work efficiency Is good. Further, it is possible to appropriately connect a monitoring device to the in-cavity pressure detection unit and observe the injection waveform and the in-cavity pressure waveform with the time axis in common. In order to measure the pressure of the molten metal and the gas pressure that the gas in the cavity compresses due to the filling of the molten metal, integration of multiple measurement sensors reduces the working time for attaching and detaching to the mold, and the cost of attaching Can be reduced.
- FIG. 1 to 5 show a mold internal information measuring sensor 100 according to the first embodiment
- FIG. 1 is a longitudinal sectional view of the mold internal information measuring sensor 100
- FIG. 2 is a sectional view of a sensor block main body
- 3 is a partial cross-sectional plan view of the sensor block
- FIG. 4 is a right side view of FIG. 1
- FIG. 5 is a schematic cross-sectional view showing a state of attachment to a mold.
- the mold internal information measuring sensor 100 can be mounted on the movable die 1a (or fixed die 1b) of the mold. For this reason, as shown in FIG. 5, the movable die 1a is provided with a mounting hole 8 reaching the cavity 2 from the back surface thereof. Then, the mold internal information measuring sensor 100 is inserted into the mounting hole 8 and attached to the measuring rod 102 so as to make the tip end face coincide with the surface of the cavity 2, and the movable die provided at the base end of the measuring rod 102. And a sensor block 104 located outside of 1a.
- a fixed unit 110 including a bite joint 106 and a set screw 108 is slidably attached to an outer peripheral portion in the middle of the measuring rod 102. Adjust the tip position of the measuring rod 102 according to the surface of the cavity 2 of the mold, tighten the set screw 108 in the mounting hole 14 of the movable die 1a, turn the bite joint 106 and bite into the outer peripheral surface of the measuring rod 102 By doing so, the measuring rod 102 is fixed in place.
- the measuring rod 102 has an outer cylinder casing 112 and a pressure transmission rod 114 disposed in the center along the axial direction.
- the pressure transmission rod 114 is a cylindrical body having an outer diameter smaller than the inner diameter of the outer cylinder casing 112, and an air passage 115 is formed between the outer cylinder casing 112 and the pressure transmission rod 114.
- the inner diameter of the outer cylinder casing 112 is slightly expanded at the tip end of the measuring rod 102, and the tip of the pressure transmission rod 114 is also formed in a smaller diameter cross section than the rod main body.
- the porous filter 116 and the guide bush 118 are mounted side by side in order.
- the porous filter 116 is made of a material having fine pores to which the molten metal such as alumina ceramics and aluminum such as carbon nanotubes does not enter.
- the guide bush 118 is formed of hard ceramic such as silicon nitride or zirconia having low thermal conductivity.
- the tip end surface of the measuring rod 102 has the end face of the outer cylinder casing 112 at the outermost periphery, the end face of the pressure transmission rod 114 at the center, and the porous filter 116 arranged concentrically between them, By attaching it, a part of the mold cavity 2 can be configured. Further, the guide bush 118 is formed with an air vent 119 communicating between the air passage 115 and the porous filter 116 side. Thereby, the gas in the cavity 2 is separated from the molten metal by the filter 116 and can be introduced into the air passage 115.
- the base of the measuring rod 102 is attached to the sensor block 104.
- the sensor block 104 has a rectangular block body 120 as shown in FIG.
- the gas introduction chamber 122 is formed to open on one surface
- the first sensor chamber 126 is formed on the opposite surface side by side on the same axial center with the partition wall 124 interposed therebetween.
- the partition wall 124 is formed with a through hole 128 communicating the gas introduction chamber 122 with the first sensor chamber 126.
- the measuring rod 102 is attached to such a sensor block 104.
- the base end portion of the outer cylinder casing 112 is attached to a casing attachment hole 122a formed in an expanded manner at the inlet opening of the gas introduction chamber 122, and is joined by welding at a corner portion of the casing outer periphery and the block main body 120.
- the proximal end of the pressure transmission rod 114 in the measuring rod 102 is longer than the outer cylinder casing 112, and the proximal end is inserted into the through hole 128 and extends to the first sensor chamber 26.
- the through hole 128 bearing-supports the pressure transmission rod 114 while sealing a gap with the pressure transmission rod 114 with the O-ring 130. Therefore, the pressure transmission rod 114 is supported at two points by the guide bush 118 provided on the inner periphery of the tip end portion of the outer cylinder casing 112 and the through hole 128 provided in the partition 124 of the sensor block 104. It is possible to move in the axial direction inside the When the tip of the pressure transfer rod 114 receives pressure, the rod is axially pressed and moved toward the opening side of the first sensor chamber 126 of the sensor block 104.
- a pressure sensor 134 formed in a donut ring shape is attached to the end face of the proximal end portion of the pressure transmission rod 114 in a state of being preloaded by a sensor fixing bolt 136.
- a block lid covering the opening of the first sensor chamber 126 facing the base end face of the pressure transmission rod 114 so as to sandwich the pressure sensor 134 with the pressure transmission rod 114. 132 is attached.
- the pressure sensor 134 is formed of a piezoelectric load detection sensor using a ceramic piezoelectric element.
- a stopper bolt 139 extending from the outer surface of the sensor block 104 into the first sensor chamber 126 is attached.
- the stopper bolt 139 is attached to a front end portion outer edge of the positioned pressure sensor 134 so as to abut a bolt tip, thereby clamping the pressure sensor 134 with the block lid 132.
- an air passage 115 formed between the outer cylinder casing 112 of the measuring rod 102 and the pressure detection rod 114 is in communication with the gas introduction chamber 122 inside the sensor block 104.
- a second sensor chamber 138 communicating with the gas introduction chamber 122 is formed to open at the outer peripheral surface of the block.
- a gas pressure sensor 140 is disposed at the opening of the second sensor chamber 138 so as to seal the opening, and the sensor outer surface is held down by a pressing block 142.
- the pressing block 142 is fixed to the sensor block 104 by bolting.
- the gas pressure sensor 140 is in the form of a donut ring, and a piezoelectric load detection sensor using a ceramic piezoelectric element similar to the pressure sensor 134 described above is used, and is preloaded with a sensor fixing bolt 144 It is fixed to the holding block 142.
- the gas pressure introduced into the porous gas introduction chamber 122 at the tip of the measuring rod 102 acts on the entire surface of the gas pressure sensor 140 facing the opening of the second sensor chamber 138. . Therefore, the gas in the cavity 2 introduced through the porous filter 116 on the tip end side of the measuring rod 102 is introduced from the gas introduction chamber 122 into the second sensor chamber 138 via the air passage 115, and the gas pressure sensor 140 The pressure can be measured.
- a purge air introduction hole 146 is opened in the gas introduction chamber 122.
- a compressed air supply pipe 148 is connected to the purge air introduction hole 146 so that compressed air can be supplied from an external compressed air source (not shown).
- compressed air can be flowed through the gas introduction chamber 122 toward the porous filter 116 described above, and clogging of the filter 44 can be checked.
- Turn off the purge air with no product in the casting cycle detect the presence or absence of residual pressure with a gas pressure sensor 140 after a certain period of time, check the residual pressure and check whether the porous filter 116 is normal for each shot do. Since it is necessary to shut off the air during casting, a check valve (not shown) may be interposed in the path to the purge air introduction hole 146.
- a pore 150 is bored in the axial core portion of the pressure transmission rod 114 described above.
- the pores 150 are in the vicinity of the tip of the pressure transmission rod 114, and have a depth that leaves a small thickness that allows metal pressure detection by the rod.
- a sheath type thermocouple 152 is loaded in the inside of the pore 150.
- the sheath type thermocouple 152 can use the general thing which filled the insulating material inside the sheath pipe
- the sheath type thermocouple 152 has a detection end directed to the distal end side of the pressure transmission rod 114 and a proximal end of the sheath tube is pressed by the distal end of the sensor fixing bolt 136.
- a pressure spring 154 and a pressure piece 156 are accommodated in the pore 150 between the tip end of the sensor fixing bolt 136 and the end of the sheath tube of the sheath type thermocouple 152 to hold the pressing force. Therefore, while the pressure sensor 134 is fixed by the sensor fixing bolt 136, the pressing piece 156 is pressed at the same time, the sheath tube is pressed by a predetermined force by the pressing spring 154, and the detection end of the thermocouple 152 is at the tip position of the pressure transmitting rod 114. It is held.
- the lead wire 158 of the sheath type thermocouple 152 is led out of the block through a cut groove 160 formed at the proximal end of the pressure transmission rod 114.
- the terminal block 162 is attached to the sensor block 104, and various lead wires of the pressure sensor 134, the gas pressure sensor 140, and the sheath type thermocouple 152 are led here. And each sensor group is connected to a measuring device via the terminal box 162, can output predetermined measurement data, and can make it display on a display means as needed.
- the sensor block 104 is provided with a drawing passage 164 leading to the first sensor chamber 126.
- the measuring rod 102 is inserted into the mounting hole 14 formed in the movable die 1a in the case of the embodiment with the mold internal information measuring sensor 100 configured as described above, and the tip surface thereof is the same as the cavity 3 It is made to be a surface and fixed in place by the fixing unit 110.
- the molten metal is filled in the cavity 2 and the metal pressure of the molten metal acts on the tip of the measuring rod 102 facing the cavity 2 and the pressure transmission rod 114 is pushed. Is detected by the pressure sensor 134.
- the gas inside the cavity is introduced into the gas introduction chamber 122 through the porous filter 116 through the air passage 115, and the gas pressure is detected by the gas pressure sensor 140.
- a sheath type thermocouple 152 provided at the tip of the pressure transmission rod 114 detects the temperature of the molten metal.
- compressed air is used as purge air from compressed air supply pipe 148 to gas introducing chamber 122 and air passage 115
- the porous filter 116 is ventilated through. This prevents the release agent from adhering to the filter 116 and prevents the filter 116 from clogging.
- air purge if the pressure detected by the gas pressure sensor 140 is higher than the atmospheric pressure or the pressure including the ventilation resistance, it is determined that the filter 116 is clogged by the molten metal, and the filter 116 can be replaced.
- the stopper bolt 139 (see FIG. 3) of the pressure sensor 134 to disengage the sensor, and then press the sensor fixing bolt 144 from the outer surface of the block lid 132 with the push bolt 166 (imaginary line at the right end of FIG. 4). Press and move forward. This moves the pressure transmitting rod 114 and pushes the guide bush 118 to push the porous filter 116 out of the tip. This is removed, filter replacement is performed and, together with the pressure transmitting rod 114, the new porous filter 116 is pressed to be accommodated in the outer casing 112. After the pressure sensor 134 is moved until it abuts on the block lid 132, the stopper bolt 139 is turned to engage the bolt tip with the front outer edge of the pressure sensor 134, thereby completing the replacement work.
- the mold internal information measuring sensor 100 since it is the direct information of the molten metal filled in the cavity 2, it is indirectly from the mold surface or the machine as in the prior art. Compared with the case where only information can be obtained, direct information can be used to judge the quality of cast products, sending out defective products to the subsequent steps is prevented, and it contributes significantly to yield improvement Can.
- a sensor for measuring the pressure of the molten metal a sensor for measuring the temperature of the molten metal, and a sensor for measuring the pressure of the gas compressed by filling the molten metal in the cavity are integrated with the internal sensor of the mold 100 Because of this, it can be easily attached to and removed from the mold surface, and the work efficiency is good. Furthermore, if a monitoring device is appropriately connected to the pressure measurement unit in the cavity 2 using the metal pressure / gas pressure / metal temperature triple integral mold internal information measurement sensor 100, the injection pressure waveform and the inside of the cavity 2 can be obtained. It is also possible to observe the gas pressure waveform together with the metal temperature information with the time axis in common.
- the detection of metal pressure, gas pressure and metal temperature is performed on the surface of the cavity 2 of the mold movable die 1a, but the sensor block 104 including the sensors is placed outside the fixed unit 110, that is, away from the mold. Therefore, thermal effects on sensors can be avoided. Adjusting the length of the measuring rod 102 arbitrarily does not affect the sensing action.
- the pressure sensor 134 and the gas pressure sensor 140 are piezoelectric type load detection sensors using ceramic piezoelectric elements, these are not disposed in the enclosed space, but are attached in an open state and air cooled. In terms of points, thermal effects can be avoided.
- the metal temperature measurement is performed at the tip of the pressure transmission rod 114, but the pressure transmission rod 114 itself is thermally blocked by the outer casing 112 and the porous filter 116, the thermally insulated guide bush 118 and the air passage 115. It does not have a structure in direct contact with the die. Therefore, the metal temperature can be measured without being affected by the mold temperature. This enables accurate metal temperature detection.
- composition was made into a compound type molten metal sensor, it is also possible to constitute so that gas pressure detection in a cavity, metal pressure detection, and metal temperature detection may be detected independently, respectively. It is also possible to combine two types of detection functions.
- application to a die casting machine was described in the above embodiment, application to a mold of a resin injection molding apparatus is also possible, and also in this case, cavity gas pressure at injection, resin pressure, resin temperature It goes without saying that it is possible to measure
- FIGS. 6 to 7 show a mold internal information measuring sensor 210 according to a second embodiment.
- a small chip is configured as a configuration in which a mold internal information measurement sensor 210 having a sensor unit is attached to the tip of a measurement rod.
- FIGS. 6 to 7 show a mold internal information measuring sensor 210 (FIG. 6) according to a second embodiment in which the present invention is applied to a die casting machine, and a measuring rod 212 (FIG. 7) equipped with the sensor.
- the mold internal information measuring sensor 210 measures changes in metal pressure, gas pressure, and temperature in the cavity 2.
- the rod type measuring rod 212 is attached to the movable die 1a.
- the movable die 1a (or fixed die 1b) has a mounting hole 8 reaching the cavity 2 from the back surface thereof, and the measuring rod 212 is inserted from the back surface of the die so that the rod tip coincides with the cavity surface.
- a fixed unit 222 consisting of a bite joint 218 and a set screw 220 is slidably attached to an outer peripheral portion of the measuring rod 212 in the middle of the rod-shaped casing 216.
- the tip of the measuring rod 212 is equipped with a mold internal information measuring sensor 210 according to the embodiment, and the details of the sensor 210 are shown in the cross-sectional view of FIG.
- the mold internal information measuring sensor 210 has a cylindrical case 224 having the same outer diameter as the rod-shaped casing 216 and screwed concentrically to the end of the rod-shaped casing 216, and measures metal pressure inside thereof A gas pressure measuring unit and a molten metal temperature measuring unit.
- the metal pressure measurement unit is as follows.
- the cylindrical case 224 has an end plate portion 226 along the same surface as the cavity 2 and a partition plate portion 228 at the rear, and has a space portion (gas introduction chamber) 230 formed in the middle portion of the both. ing.
- a pressure transmission rod 232 axially supported by the end plate portion 226 and the partition plate portion 228 along the axial center direction of the cylindrical case 224 is axially slidably mounted in a movable manner, and a cavity is formed. The pressure received from the molten metal ML filled in 2 can be transmitted backward.
- a flange 232 a is provided at the rear end of the pressure transmission rod 232, and the flange 232 a is fitted into a recessed portion formed in the partition plate portion 228. Further, a pressure lid 234 is fixed to a back surface of the partition plate portion 228 (opposite to the cavity 2) by a bolt 236 so as to cover the entire back surface. A load cell 238 is attached to the pressing lid 234 at a position facing the flange 232 a of the pressure transmission rod 232. Thereby, the pressure transmission rod 232 can measure the metal pressure directly received from the molten metal ML.
- a piezoelectric pressure sensor heat-resistant temperature 300 degrees, measured melt temperature 850 degrees or less, maximum measured pressure 200 MPa
- the material having the piezoelectric effect can be structurally located at a position closer to the molten metal at the detection part of the sensor, and it can be expected that the error factor is smaller compared to the indirect measurement.
- a heat insulating system ceramic member 240 may be interposed in the middle of the pressure transmission rod 232 to thermally insulate the heat from the molten metal ML and to thermally protect and protect the measuring unit side.
- An annular recess 242 is formed on the end surface of the end plate portion 226 so as to surround the pressure transmission rod 232.
- a ring-shaped porous filter 244 which is impermeable to liquid phase material such as molten aluminum but passes gas is attached.
- the filter 244 is made of, for example, a material having fine pores to which molten metal such as alumina ceramics, carbon nanotubes and the like does not enter.
- an air passage 246 communicating with the space portion 230 of the cylindrical case 224 is formed in the bottom plate portion of the annular recess 242 to which the filter 244 is attached.
- a gas pressure sensor 248 is attached to the space 230. In this embodiment, it is fixed to the plate surface of the partition plate portion 228.
- the gas separated into gas by the filter 244 is introduced into the space 230, and the pressure in the space 230 can be detected as the gas pressure.
- a purge air introducing hole 250 communicating with the rod-shaped casing 216 is formed in the partition plate portion 228 forming the space portion 230 and the pressing lid 234 joined thereto.
- the purge air introduction hole 250 is connected to a source of compressed air (not shown) outside the system, and as a clogging check of the filter 244, air with controlled pressure and flow is made to flow in the absence of the product in the cycle, and a gas pressure sensor Check the pressure at 248 and check every shot whether the filter 244 is normal.
- a check valve 252 is interposed in the purge air introduction hole 250 because it is necessary to shut off air flow during casting.
- the configuration for measuring the metal temperature is as follows.
- a pore 254 is bored in the axial core of the pressure transmission rod 232.
- the pores 254 reach near the tip of the pressure transmission rod 232, and have a depth that leaves a small thickness that allows metal pressure detection by the rod.
- a thermocouple 256 is attached to this pore 254 so that the temperature of the molten metal can be detected.
- the pore 254 is used as a lead passage of the lead wire 256 a of the thermocouple 256.
- the lead cell of the load cell 238, the gas pressure sensor 248, and the thermocouple 256 is connected to a measuring instrument outside the system through a passage provided in the partition plate portion 228 and the pressing lid 234, and the rod type casing 216.
- the mold internal information measurement sensor 210 configured as described above inserts the measurement rod 212 into the mounting hole 8 formed in the movable die 1 a in the mold opened state, and measures the mold internal information at the tip
- the front end surface of the sensor 210 is flush with the cavity 2 and fixed in place by the fixing unit 222.
- the molten metal is filled in the cavity 2 and the metal pressure of the molten metal acts on the tip of the mold internal information measuring sensor 210 facing the cavity 2 to push the pressure transmission rod 232 And this force is detected by the load cell 238.
- the gas inside the cavity is introduced into the space 230 through the filter 244, and the gas pressure is detected.
- thermocouple 256 provided at the tip of the pressure transmission rod 232 detects the temperature of the molten metal. These data are measured in time series by a measuring device (not shown), and the metal temperature, the gas pressure in the mold, and the metal temperature as shown in FIG. 10 are measured.
- the mold internal information measuring sensor 210 as in the case of the first embodiment, the cavity gas pressure, the metal pressure and the metal temperature of the molten metal filled in the cavity 2, etc.
- direct cavity internal information can be obtained, which can be used to judge the quality of cast products, and it is possible to prevent sending out defective products in the subsequent steps, significantly improving yield. It can contribute.
- a sensor for measuring the pressure of the molten metal a sensor for measuring the temperature of the molten metal, and a sensor for measuring the pressure of the gas compressed by filling the molten metal in the cavity are integrated into a mold integrated information measuring sensor 210 Therefore, it can be easily attached to and removed from the mold surface, and the work efficiency is good. Furthermore, if a monitoring device is appropriately connected to the pressure measurement unit in the cavity 2 using the metal pressure / gas pressure / metal temperature triple integral mold internal information measurement sensor 210, the injection pressure waveform and the inside of the cavity 2 can be obtained. It is also possible to observe the gas pressure waveform together with the metal temperature information with the time axis in common.
- the tip of the measuring rod 212 is a small chip internal die measuring sensor 210, the handling is simple and the replacement at the time of damage can be easily performed.
- the measurement of the metal pressure, the gas pressure, and the metal temperature may be individually measured, or may be performed in combination of two types. It is also possible.
- JIS JIS according to JIS as follows.
- a Determination of metal pressure 1 The maximum value is X% or more with respect to the machine pressure Example: The pressure rises to 80% or more in metal conversion 2) After t seconds Y% or more from the completion of filling 0.
- the present invention makes a great contribution to the stability of quality as a sensor capable of judging the quality of a product while monitoring the inside of a mold cavity when molding a die casting machine or a resin injection device.
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- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
Description
また、金型内に冷却水が残ったり、金型亀裂で浸み出したりした場合、水分に溶湯が触れた瞬間、金型内で爆発を発生させていたが、金型からの情報は取れなかった。
本発明は、プランジャスリーブ内に定量給湯した金属・樹脂などの溶湯を、プランジャにより金型のキャビティ内に加圧充填し、製品を鋳造・成形する加圧鋳造品の良否判定を行うのに好適な金型内部情報計測センサーを提供することを目的としている。
また、前記ガス導入室に圧縮空気供給手段を接続し、前記多孔質フィルターにパージエアを供給可能な構成とすることができる。
前記多孔質フィルターをリング状としてその中心部に圧力伝達ロッドを挿通した構成とし、前記圧力伝達ロッドの中心部にはロッド先端部に達する細孔を形成して内部に熱電対を配置する構成とすればよい。
図1~図5は、第1実施形態に係る金型内部情報計測センサー100を示しており、図1は金型内部情報計測センサー100の縦断面図、図2はセンサーブロック本体の断面図、図3はセンサーブロックの部分断面平面図、図4は図1の右側面図、図5は金型への取り付け状態を示す模式断面図である。
メタル圧、ガス圧、メタル温度の検知は金型可動ダイス1aのキャビティ2の面で行なうが、センサー類を備えるセンサーブロック104は、固定ユニット110の外側、すなわち金型から離れた位置に置かれるため、センサー類への熱的影響を回避することができる。計測ロッド102の長さを任意に調整しても、センシング作用に影響しない。
更に、上記実施形態では、ダイカストマシンへの適用例を説明したが、樹脂射出成形装置の金型への適用も可能であり、この場合においても、射出時のキャビティガス圧、樹脂圧、樹脂温度の計測ができるのはいうまでもない。
図6~図7は、本発明をダイカストマシンに適用した第2実施形態に係る金型内部情報計測センサー210と(図6)、これを装備した計測ロッド212(図7)を示している。この金型内部情報計測センサー210は、前記第1実施形態と同様に、キャビティ2内のメタル圧、ガス圧、温度の変化を計測するものである。
なお、圧力伝達ロッド232の途中には断熱系セラミック部材240を介在させ、溶湯MLからの熱を断熱し、計測部側を断熱保護するようにしてもよい。
なお、ロードセル238、ガス圧センサー248、熱電対256のリード線は仕切り板部228や押さえ蓋234に設けた通路、ロッド形ケーシング216を介して系外の計測器に接続される。
第2実施形態においても、第1実施形態と同様に、メタル圧・ガス圧・メタル温度の計測を、各々単体で計測するように構成することも、2種の組み合わせで計測するように構成することも可能である。
A メタル圧力の判定
1 マシン圧力に対して最大値がX%以上であること
例)メタル換算で80%以上に圧力が上がること
2 t秒後Y%以上であること
例)充填完了から0.1秒後に20%以上に圧力があること
B ガス圧(大気圧ダイカストの場合)
1 ガス圧がVPa以下であること
例)ガス圧の最大値が50Pa以下であること
2 ガス圧の積分値がZcm2以下である事
例)ガス圧の積分値=ガス容積がキャビティ容積の80%以下であること
C ガス圧(真空ダイカストの場合)
1 真空圧がWPa以上であること
例)真空の最大値がー30Pa以下であること
2 真空圧の積分値がVcm2以上である事
D 金型温度
金型温度が温度振幅の上限と下限に以内に入っていること
したがって、本実施形態では、上記判定基準を溶湯から直接計測することができるので、信頼性の高い計測データを得ることが出来る。
100………金型内部情報計測センサー、102………計測ロッド、104………センサーブロック、106………食込み継手、108………止めネジ、110………固定ユニット、112………外筒ケーシング、114………圧力伝達ロッド、115………通気路、116………多孔質フィルター、118………ガイドブッシュ、119………通気孔、120………ブロック本体、122………ガス導入室、122a………ケーシング取付孔、124………隔壁、126………第1センサー室、128………貫通孔、130………Oリング、132………ブロック蓋、134………圧力センサー、136………センサー固定ボルト、138………第2センサー室、139………ストッパボルト、140………ガス圧センサー、142………押さえブロック、144………センサー固定ボルト、146………パージエア導入孔、148………圧縮エア供給管、150………細孔、152………シース型熱電対、154………押さえバネ、156………押さえ駒、158………リード線、160………切り込み溝、162………端子ボックス、164………引出し通路、166………押しボルト、
210………金型内部情報計測センサー、212………計測ロッド、214………装着孔、216………ロッド形ケーシング、218………食込み継手、220………止めネジ、222………固定ユニット、224………円筒ケース、226………エンドプレート部、228………仕切り板部、230………空間部、232………圧力伝達ロッド、232a………フランジ、234………押さえ蓋、236………ボルト、238………ロードセル、240………断熱系セラミックス部材、242………環状凹部、244………フィルター、246………通気路、248………ガス圧センサー、250………パージエア導入孔、252………逆止弁、254………細孔、256………熱電対。
Claims (9)
- 金型ダイスに穿設されキャビティに開口する装着孔に装着可能なロッド形ケーシングと、
前記ロッド形ケーシングの先端に配置されて金型キャビティ面に先端面を一致可能であって溶湯からガスを分離可能な多孔質フィルターと、
この多孔質フィルターの後方に設けられ当該多孔質フィルターを通じて導入されるキャビティガスの導入室と、
前記ガス導入室の圧力を検出するガス圧センサーと、
を有し、キャビティ内ガス圧を検出可能としてなることを特徴とする金型内部情報計測センサー。 - 金型ダイスに穿設されキャビティに開口する装着孔に装着可能なロッド形ケーシングと、
前記ロッド形ケーシングの先端に配置されて金型キャビティ面に先端面を一致可能であって溶湯からガスを分離可能な多孔質フィルターと、
この多孔質フィルターの後方に設けられ当該多孔質フィルターを通じて導入されるキャビティガスの導入室と、
前記ガス導入室の圧力を検出するガス圧センサーと、
を有するとともに、
前記ロッド形ケーシングに内挿され、その軸芯方向に可動で金型キャビティ面に先端面を一致可能な圧力伝達ロッドと、
前記圧力伝達ロッドの後端に対面して固定保持され、キャビティに注入された溶湯の圧力を検知可能な圧力センサーと、
を有し、キャビティ内ガス圧およびキャビティ内溶湯圧を検出可能としてなる
ことを特徴とする金型内部情報計測センサー。 - 金型ダイスに穿設されキャビティに開口する装着孔に装着可能なロッド形ケーシングと、
前記ロッドケーシングの先端に配置されて金型キャビティ面に先端面を一致可能であって溶湯からガスを分離可能な多孔質フィルターと、
この多孔質フィルターの後方に設けられ当該多孔質フィルターを通じて導入されるキャビティガスの導入室と、
前記ガス導入室の圧力を検出するガス圧センサーと、
を有するとともに、
前記ロッド形ケーシングに内挿され、その軸芯方向に可動で金型キャビティ面に先端面を一致可能なロッドと、
前記ロッドの中心部に形成された細孔に装着され、前記細孔のロッド先端部側に検知端を有する熱電対からなる温度センサーと、
を有し、キャビティ内ガス圧およびキャビティ内溶湯温度を検出可能としてなることを特徴とする金型内部情報計測センサー。 - 金型ダイスに穿設されキャビティに開口する装着孔に装着可能なロッド形ケーシングと、
前記ロッド形ケーシングの先端に配置されて金型キャビティ面に先端面を一致可能であって溶湯からガスを分離可能な多孔質フィルターと、
この多孔質フィルターの後方に設けられ当該多孔質フィルターを通じて導入されるキャビティガスの導入室と、
前記ガス導入室の圧力を検出するガス圧センサーと、
を有するとともに、
前記ロッド形ケーシングに内挿され、その軸芯方向に可動で金型キャビティ面に先端面を一致可能な圧力伝達ロッドと、
前記圧力伝達ロッドの後端に対面して固定保持され、キャビティに注入された溶湯の圧力を検知可能な圧力センサーと、
前記圧力伝達ロッドの中心部に形成された細孔に装着され、前記細孔のロッド先端部側に検知端を有する熱電対からなる温度センサーと、
を有し、キャビティ内ガス圧、キャビティ内溶湯圧、およびキャビティ内溶湯温度を検出可能としてなることを特徴とする金型内部情報計測センサー。 - 前記ロッド形ケーシングの外周に摺動自在に取り付けられる食込み継手と、前記装着孔への止めネジとからなる固定ユニットを有しており、金型ダイス厚に応じてロッド挿入長さを調整可能としていることを特徴とする請求項1~4のいずれか1に記載された金型内部情報計測センサー。
- 前記ガス導入室に圧縮空気供給手段を接続し、前記多孔質フィルターにパージエアを供給可能としていることを特徴とする請求項1~4のいずれか1に記載された金型内部情報計測センサー。
- 金型ダイスに穿設されキャビティに開口する装着孔に装着可能で、前記金型ダイス厚さより長尺なロッド形ケーシングと、
前記ロッド形ケーシングの基端部に設けられたセンサーブロックと、
前記ロッド形ケーシングの先端に配置されて金型キャビティ面に先端面を一致可能であって溶湯からガスを分離可能な多孔質フィルターと、
前記センサーブロックに形成され、前記多孔質フィルターを通じて導入されるキャビティガスの導入室と、
前記センサーブロックに装備され前記ガス導入室の圧力を検出するガス圧センサーと、
を有し、キャビティ内ガス圧を検出可能としてなることを特徴とする金型内部情報計測センサー。 - 金型ダイスに穿設されキャビティに開口する装着孔に装着可能で、前記金型ダイス厚さより長尺なロッド形ケーシングと、
前記ロッド形ケーシングの基端部に設けられたセンサーブロックと、
前記ロッド形ケーシングの先端に配置されて金型キャビティ面に先端面を一致可能であって溶湯からガスを分離可能な多孔質フィルターと、
前記センサーブロックに形成され、前記多孔質フィルターを通じて導入されるキャビティガスの導入室と、
前記センサーブロックに装備され前記ガス導入室の圧力を検出するガス圧センサーと、
を有するとともに、
前記ロッド形ケーシングに内挿され、その軸芯方向に可動で金型キャビティ面に先端面を一致可能な圧力伝達ロッドと、
前記圧力伝達ロッドの後端に対面して前記センサーブロックとの間に保持され、キャビティに注入された溶湯の圧力を検知可能な圧力センサーと、
を有し、キャビティ内ガス圧およびキャビティ内溶湯圧を検出可能としてなることを特徴とする金型内部情報計測センサー。 - 前記多孔質フィルターをリング状としてその中心部に圧力伝達ロッドを挿通した構成とし、前記圧力伝達ロッドの中心部にはロッド先端部に達する細孔を形成して内部に熱電対を配置してなることを特徴とする請求項7または8に記載の金型内部情報計測センサー。
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US20170028463A9 (en) * | 2012-11-12 | 2017-02-02 | Bayerische Motoren Werke Aktiengesellschaft | Method and Device for Producing a Die-Cast Part |
WO2020059113A1 (ja) * | 2018-09-21 | 2020-03-26 | 本田技研工業株式会社 | ダイカスト用鋳造金型およびその減圧路コンダクタンス設定方法 |
JP6707718B1 (ja) * | 2018-09-21 | 2020-06-10 | 本田技研工業株式会社 | ダイカスト用鋳造金型およびその減圧路コンダクタンス設定方法 |
US11738388B2 (en) | 2018-09-21 | 2023-08-29 | Honda Motor Co., Ltd. | Casting mold for die casting, and method for setting decompression path conductance thereof |
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JP4945013B2 (ja) | 2012-06-06 |
CN102892532A (zh) | 2013-01-23 |
JPWO2011115276A1 (ja) | 2013-07-04 |
US20130000384A1 (en) | 2013-01-03 |
JP2012121070A (ja) | 2012-06-28 |
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