JP5615640B2 - Non-ferrous metal melt supply equipment - Google Patents

Description

  The present invention relates to a supply device for supplying a non-ferrous metal molten metal such as an aluminum alloy or a zinc alloy to a die casting machine or the like, and more specifically, from a molten metal furnace to a die casting machine, or from a melting furnace to a molten metal furnace, etc. The present invention relates to a non-ferrous metal molten metal supply device and a quantitative supply control method thereof that improve the accuracy of hot water supply with a simple device.

  Conventionally, when manufacturing non-ferrous metal die castings such as aluminum, zinc, and their alloys, a piston pump is used as a device for supplying non-ferrous metal melts to the die cavities of die casting machines, and molten metal holding Mainly known are a method of supplying from a furnace with an electromagnetic pump, a method of supplying a molten metal by gas pressurization by sealing a molten metal holding furnace, and the like.

  The aforementioned molten metal piston pump system requires a check valve and a pump chamber, so the structure is complicated and robustness is required. Further, in order to immerse the piston pump in the melting furnace, a large-capacity holding furnace and melting furnace are required, and the apparatus becomes large. In the electromagnetic pump method, metering is controlled by the drive time of the electromagnetic pump, so it is easily affected by voltage fluctuations, changes in the cross-sectional area of the hot water supply pipe, gas pressure in the mold cavity, etc. Is bad. In addition, since a large-capacity holding furnace and melting furnace are required, the operation and maintenance of the equipment are generally complicated, and the equipment costs are expensive. In addition, the method of supplying molten metal by gas pressurization requires a large-capacity holding furnace and melting furnace, the extra cost of making the furnace airtight, and control of gas pressure and flow rate for gas pressurization. An apparatus is required, and the operation and maintainability of the facility are generally complicated, and the facility cost is expensive.

  In order to solve these problems, the accuracy of hot water supply has been improved and the apparatus has been simplified. As this prior art, a non-ferrous metal melt supply device is disclosed. (References 1, 2)

JP 2002-66727 A, [Claim 1], [0007 to 0008], [FIG. 4]. JP 2002-137052 A, [Claim 1], [0007], [FIG. 1]

  In this prior art 1, the molten metal intake cylinder is always immersed in the molten metal, and after the molten metal is introduced into the measuring space in which the two upper and lower pumping elements are separated from each other in the cylinder, the two pumping elements are raised synchronously to the outside. Although it is a device that supplies molten metal to the hot water, it can pump up high-quality hot water in the deep part of the molten metal furnace, but the structure of the device is complicated, and the drive means for taking in and discharging the molten metal into the measuring space is also complicated There were problems such as becoming. Prior art 2 is a supply device in which a hot water pipe having a piston pump built in a molten metal storage pot is connected obliquely upward, and can perform a fixed amount of molten metal in the hot water pipe, and does not require a check valve or a pump chamber. However, the piston may be supported in a cantilevered manner in an oblique direction, so that the accuracy of measurement can be improved due to the inclination of the hot water surface relative to the piston surface and the leakage caused by the gap between the hot water supply pipe and the piston. Issues remain in maintenance.

  The present invention has been made to solve the above-mentioned problems, and an object thereof is to provide a non-ferrous metal melt supply device with improved accuracy of hot water supply amount with a simple device. is there.

A non-ferrous metal melt supply apparatus according to claim 1 of the present invention is a non-ferrous metal melt supply apparatus that measures non-ferrous metal melt and supplies it to a casting machine, and has a plurality of melt inflow holes provided at an upper portion thereof. A molten metal intake cylinder in which the portion including the molten metal inflow hole is immersed in the molten metal in the molten metal furnace, and a tubular piston shaft that is inserted into the molten metal intake cylinder and is connected to the lower end of the tubular piston shaft connected to the molten metal outflow pipe at the top. a piston, and a driving means for elevating the molten metal cylinder holds the piston underside on the melt surface and the same level of the molten metal furnace, lowers the melt cylinder from the melt inlet to a position where the molten metal flows, After charging the molten metal into the molten cylinder, the molten cylinder is lifted to discharge the molten metal inside the molten cylinder from the molten metal outlet pipe via the tubular piston shaft and supply it to the casting machine. And butterflies.

  With this configuration, the molten metal intake cylinder can be lowered and held in a position where it can be poured into the molten metal intake cylinder from the upper molten metal inflow hole, so that the suction valve required for the conventional piston drive type is unnecessary. It is. Discharge of the molten metal can be done by raising the molten metal intake cylinder to lift the molten metal and supplying the molten metal from the molten metal outlet pipe via the tubular piston shaft in the center of the piston, eliminating the need for a check valve required for the piston drive type. It is. As a result, the molten metal pump according to the present invention is valveless, has a simple structure, has low equipment costs, and has few parts to be broken or maintained, so that maintenance of equipment is easy. Further, the molten metal intake cylinder does not need to be always immersed in the molten metal, and damage such as melting and erosion due to the molten non-ferrous metal of the cylinder is reduced.

  In addition, since the present invention device can be installed in a hot water discharge chamber of a hand-held furnace and can be independently supplied with hot water, a function of applying pressure to the hand-held furnace in supplying molten metal from the hand-held furnace to the casting machine. Since there is no need to attach an electromagnetic pump or electromagnetic pump, it is simple in terms of equipment, is excellent in operation and maintainability, and equipment costs are also low.

  In addition, with this configuration, there is no need to eliminate the gap between the inner wall of the molten metal intake cylinder and the outer periphery of the piston, so the design of the molten metal pump according to the present invention comprising the molten metal intake cylinder and the piston with a carbonaceous or ceramic specification. Manufacture is easy, and since the cylinder and the piston do not interfere with each other, the frequency of repairs against melting and damage is low, and the machine life is extended.

Further, soluble Yukyo supply device non-ferrous metals according to claim 2 is the melt supply device non-ferrous metals according to claim 1, in the melt intake cylinder, a laser distance measuring device irradiates aiming at the upper surface of the piston portion provided above the molten metal inlet cylinder, by the level of the molten metal coming from leaking to the piston upper surface along the solution water intake cylinder inner wall by measuring the increase in solution water intake cylinder to calculate a melt leakage amount between cylinder and piston The molten metal discharge amount that passes through the tubular piston shaft is calculated by correcting the molten metal leakage amount to be subtracted from the calculated molten metal discharge amount.

  With this configuration, when the molten metal intake cylinder rises and discharges the molten metal in the cylinder, the height of the molten metal reservoir leaking from the gap between the cylinder inner wall and the piston outer periphery is measured from above by the laser, and the cylinder is disconnected. The amount of leakage can be calculated from the relationship between the area and the height of the molten metal leaked. And the correction | amendment which subtracted this leak amount from the calculation molten metal discharge amount by the raise of a molten metal intake cylinder can calculate the net molten metal discharge amount which passes a tubular piston axis | shaft. Thus, the molten metal outflow amount can be obtained without contacting the molten metal.

Further, the molten metal supply device nonferrous metals according to claim 3 is the molten metal supply device nonferrous metals according to claim 1, a laser distance measuring device for irradiating the said tubular piston shaft in the axial direction in the tubular piston shaft upward with the flow rate of molten metal through the tubular piston shaft to caster discharged from the molten metal outlet pipe, by measuring the level of the molten metal surface of the tubular piston inner shaft, controlling the molten metal melt the target level Thus, the amount of molten metal supplied to the casting machine is controlled.

With this configuration, the molten metal passes through the tubular piston shaft, overflows and flows out into the orthogonal molten metal outflow pipe, and the molten metal level of the supplied molten metal supplied to the casting machine is measured by laser measurement from above. Can be adjusted to.

  According to the non-ferrous metal melt supply device of claims 1 to 3 according to the present invention, this device is a cylinder-driven pump system that does not use any valve, and the molten metal also leaks through the gap between the cylinder inner wall and the piston. There is no need to have no structure. Further, since there is no need to always immerse the molten metal intake cylinder in the molten metal, the degree of erosion is less with respect to the carbonaceous or ceramic cylinder, and the molten metal is hardly contaminated. In addition, since the molten metal supply amount can be grasped by using two types of laser distance measuring devices, the measurement accuracy is good regardless of the work environment, and repair is possible because it is non-contact with the molten metal.・ There is no maintenance. In this way, it is a simple device that can supply a fixed amount of molten metal from a manual furnace to a casting machine, or from a melting furnace to a molten metal manual furnace, and is not only applied to a combination of a new furnace and casting machine, but also an old furnace and casting. It is possible to replace the combination of machines, and the equipment cost is low. In particular, it is easy to apply to a cold chamber system among die casting machines.

FIG. 1 is a schematic side view showing an arrangement of a non-ferrous metal melt supply device and a hand-held furnace according to an embodiment for carrying out the present invention. FIG. 2 is a schematic cross-sectional view of a non-ferrous metal melt supply apparatus according to an embodiment for carrying out the present invention. FIG. 3 is a schematic cross-sectional view for explaining the sequence of the molten metal supply operating state in the non-ferrous metal molten metal supply apparatus according to the embodiment for carrying out the present invention.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to FIGS. The non-ferrous metal melt supply apparatus 1 is an apparatus for supplying a melt made of a non-ferrous metal such as an aluminum alloy or a zinc alloy to a cold chamber of a die casting machine. As shown in FIGS. 1 and 2, in the molten metal supply device 1, a supply pump composed mainly of a molten metal intake cylinder 2 and a piston 3 that can be moved up and down is supported on a frame 9 by support arms 2 c and 4 b. In the molten metal supply device 1, the gantry 9 is disposed on the hand-held furnace 20 so that the molten-metal intake cylinder 2 can be immersed in the melt feed-out port 21 of the hand-held furnace 20.

  The molten metal intake cylinder 2 has a plurality of molten metal inflow holes 2a at the top, and when the molten metal intake cylinder 2 is immersed in the molten metal, the molten metal 10 flows into the molten metal intake cylinder 2 from the molten metal inflow hole 2a. The molten metal 10 is charged up to the level of the molten metal inflow hole 2a. The molten metal intake cylinder 2 is connected to the support arm 2c via three cylinder lifting arms 2b and can be driven up and down by a cylinder lifting and lowering driving device 6 attached to the gantry 9. The cylinder lifting / lowering driving device 6 also has a function of detecting the lifting position of the molten metal intake cylinder 2 and a function of changing the lifting speed.

  The piston 3 is fitted to the lower end of a tubular piston shaft 4 through which the molten metal 10 passes, and is inserted into the molten metal intake cylinder 2 so as to contact the inner wall. The piston 3 is connected to a support arm 4b via a tubular piston shaft 4, and the support arm 4b is fixedly attached to the gantry 9. Further, in order to adjust the level of the lower surface of the piston 3 to the molten metal surface 10a, the tubular piston shaft 4 or the support arm 4b has an attachment function on the mount 9 attachment portion. Further, a melt outflow pipe 5 is branched in a horizontal direction through a T-shaped vent 4a at an intermediate portion of the tubular piston shaft 4, and the outlet of the melt outflow pipe 5 is a cold chamber of a die casting machine (not shown). It arrange | positions so that the molten metal 10 can be inserted into a part.

  As the material of the molten metal intake cylinder 2 and the piston 3, since an aluminum alloy (melting point around 650 ° C.) has a higher melting point than a zinc alloy or a magnesium alloy, it has heat resistance, corrosion resistance, and oxidation resistance. In addition, a carbonaceous material or a silicon nitride material is preferable from the viewpoint of resistance to deformation. Moreover, it is suitable for the tubular piston shaft 4 and the molten metal outflow pipe 5 to use a steel pipe in which a refractory material is incorporated from the viewpoint of strength and the viewpoint of not cooling the molten metal.

  The apparatus 1 is provided with two laser distance measuring devices 7 and 8 from the viewpoint of accurately calculating the discharge amount of the molten metal. The laser distance measuring device 8 transmits / receives a laser beam 8a on the surface of the piston 3 along the tubular piston shaft 4, and the molten metal 10 leaks from the gap between the inner wall of the cylinder 2 and the piston 3 and accumulates on the surface of the piston 3. In order to measure the hot water surface height of the leaking portion 8b, it is arranged side by side with the laser distance measuring device 7. The amount of molten metal leaking from the gap between the inner wall of the molten metal intake cylinder 2 and the piston 3 can be calculated from the measured value of the molten steel surface height of the molten metal leakage portion 8b and the cross-sectional area of the cylinder. The melt discharge amount can be calculated by subtracting and correcting the melt discharge amount from the molten metal intake cylinder 2 rising with respect to the fixed piston 3 by the leakage amount.

  The laser distance measuring device 7 transmits and receives the laser beam 7a into the tubular piston shaft 4, and the molten metal 10 ascends the tubular piston shaft 4 and overflows into the molten metal outlet pipe 5 at the T-shaped vent 4a. In order to measure the height of the swelled portion 7b of the molten metal 10 in FIG. The height of the rising portion 7b of the molten metal 10 in the molten metal outlet pipe 5 can be measured and adjusted to the target molten metal height. In addition, since the T-shaped vent 4 is employed, the structure is such that the molten metal swell surface can be easily measured with the laser beam 7a.

  A series of operations of the molten metal supply in the non-ferrous metal molten metal supply apparatus 1 according to the present invention will be described with reference to FIGS.

    FIG. 3A shows a standby position of the molten metal supply device 1, and the molten metal intake cylinder 2 is such that the inner bottom of the molten metal intake cylinder 2 is substantially in contact with the piston 3 and the outer bottom surface is in contact with the molten metal surface 10a. Indicates a state in which the value rises near the upper limit. FIG. 3B shows a state in which the molten metal intake cylinder 2 is lowered in the molten metal supply device 1 in order to pump the molten metal 10, that is, connected to the molten metal intake cylinder 2. The cylinder raising / lowering arm 2b has shown the state which is descending by the cylinder raising / lowering drive device 6. FIG.

  In FIG. 3C, the molten metal inflow hole 2a of the molten metal intake cylinder 2 reaches the molten metal surface 10a and stops, and the molten metal 10 passes through the molten metal inflow hole 2a and is inserted into the molten metal intake cylinder 2. Until the molten metal intake cylinder 2 reaches a predetermined amount, the position of the molten metal intake cylinder 2 is maintained or lowered. If the retained amount of the molten metal in the hand furnace 20 is significantly larger than the amount of pumping, the molten metal 10 can be charged without changing the pumping position of the molten metal intake cylinder 2 much.

  In FIG. 3 (d), the molten metal supply device 1 starts supplying the molten metal 10, and the molten metal intake cylinder 2 in which the molten metal 10 is charged is connected to the cylinder lifting / lowering driving device 6 via the cylinder lifting / lowering arm 2b. The state in which the molten metal 10 is raised by α and the molten metal 10 of the molten metal intake cylinder 2 is blocked by the piston 3 so that the molten metal 10 ascends and discharges the tubular piston shaft 4 is shown. From this point of time, it is possible to start measuring the height of the molten metal 10 leaking from the gap between the inner wall of the molten metal intake cylinder 2 and the outer peripheral surface of the piston 3 in contact with the laser beam 8 a from the laser distance measuring device 8.

  FIG. 3 (e) shows a state where the molten metal supply device 1 is about to finish supplying the molten metal 10, and the molten metal 10 in the molten metal intake cylinder 2 moves along the tubular piston shaft as the molten metal intake cylinder 2 rises α. 4, the T-shaped vent 4 changes the direction in the horizontal direction to form the molten metal rising portion 7 b, and then overflows into the molten metal outflow pipe 5, via the molten metal outflow pipe 5, or low pressure It supplies to the supply part (cold chamber) of a casting furnace. At this time, the laser beam 7 a transmitted from the laser distance measuring device 7 is reflected by the molten metal rising portion 7 b in the T-shaped vent 4 to measure the molten metal rising height. The required molten metal capacity can be controlled by adjusting this measured value to the required height of the supply section.

  It is also possible to control the ascending / descending speed of the molten metal intake cylinder 2 in order to match the measured value of the molten metal height or molten metal flow rate to the respective set values. That is, the set value of the molten metal holding height or molten metal flow rate is input to a computer control device (not shown), and the molten metal intake cylinder 2 is moved up and down to match the calculated measured value of the molten metal height or molten metal flow rate with the set value. The amount is output to the cylinder raising / lowering driving device 6 to control the raising / lowering speed and position of the molten metal intake cylinder 2.

  In the case of FIG. 3 (e), the molten metal 10 of the molten metal intake cylinder 2 passes through the tubular piston shaft 4 along with the rising α of the molten metal intake cylinder 2, overflows the molten metal outlet pipe 5, and then flows into the molten metal outlet pipe 5. To the die casting machine or the supply part (cold chamber) of the low pressure casting furnace. At this time, when the molten metal intake cylinder 2 rises α and discharges the molten metal 10, the molten metal 10 leaks from the gap between the inner wall of the molten metal intake cylinder 2 and the piston 3 and accumulates on the surface of the piston 3. By measuring the height of the molten metal surface with the laser beam 8 a of the laser distance measuring device 8, the leakage amount of the molten metal 10 can be calculated.

Then, the amount of molten metal passing through the actual tubular piston shaft 4 can be calculated by subtracting the leakage amount from the calculated discharge amount discharged from the rising stroke of the molten metal intake cylinder 2.
Actually, the amount of molten metal passing through the molten metal outlet pipe 5 needs to reduce the amount of molten metal remaining in the tubular piston shaft 4. Further, since the amount of the molten metal intake cylinder 2 rising α to discharge the molten metal 10 and the leakage amount of the molten metal 10 in the molten metal leakage portion 8b can be calculated from moment to moment, not only the total amount of molten metal 10 but also the supply speed is calculated. It is possible.

  It is also possible to control the ascending / descending speed of the molten metal intake cylinder 2 in order to match the calculated values of the calculated molten metal height or molten metal flow rate to the respective set values. That is, the set value of the molten metal holding height or the molten metal flow rate is inputted to a computer control device (not shown), and the amount of operation for raising and lowering the molten metal intake cylinder 2 to match the calculated measured value of the molten metal height or molten metal flow rate with the set value. Is output to the cylinder lifting / lowering drive device 6 to control the lifting speed and position of the molten metal intake cylinder 2.

  Moreover, the raising / lowering speed | rate of the molten metal intake cylinder 2 is controlled by superimposing or selecting the raising / lowering operation amount of the molten metal intake cylinder 2 obtained by the said two methods, and a molten metal height or a molten metal flow rate is tracked as set. Is also possible.

  FIG. 3 (f) shows a state in which the molten metal supply device 1 has moved up near the upper limit of the molten metal intake cylinder 2 and has finished discharging the molten metal 10, and cannot flow out to the tubular piston shaft 4 through the molten metal outlet pipe 5. There is a remainder of the molten metal 10. Further, leakage of the molten metal 10 from the molten metal leakage portion 8b remains in that state.

  FIG. 3 (g) shows a state in which the molten metal intake cylinder 2 descends at the stage of preparation for supplying the molten metal 10 next time after the molten metal supply device 1 finishes discharging the molten metal 10. 4 and the molten metal 10 remaining in the molten metal leaking portion 8b drop and accumulate at the bottom of the molten metal intake cylinder 2. The remaining hot water is mixed with new molten metal 10 and supplied when the next molten metal 10 is received.

    FIG. 3 (h) is the same as the state of FIG. 3 (b), and (b)-(h) show one shot (cycle) in which the molten metal supply device 1 discharges and supplies the molten metal 10. Become.

  The features of the non-ferrous metal melt supply apparatus 1 according to the present invention will be described. The melt 10 of the tubular piston shaft 4 returns to the melt intake cylinder 2 every shot (cycle), and the tubular piston shaft 4 and the melt outflow pipe 5 are Since it becomes empty, there is no fear that the molten metal 10 adheres, and it is kept clean. As a result, the flow rate control can be expected to be accurate, and equipment maintenance may be possible. In addition, since the position of the piston 3 is fixed substantially the same as the molten metal level 10a of the hand-held furnace 20, the discharge position of the molten metal discharge pipe 5 becomes constant, and the hot water receiving position of the next-stage die casting machine can be easily determined. The bath can be received smoothly.

  Further, there may be a slight gap between the inner wall of the molten metal intake cylinder 2 and the piston 3, and it is not necessary to slide in contact with each other, and both are not damaged. Moreover, the relative movement of the two is smooth without being disturbed. In addition, since the molten metal 10 does not remain in the gap between them, it is easy to start and stop. Further, the material of the molten metal intake cylinder 2 and the piston 3 is made of a carbonaceous material or silicon nitride material, so that the molten metal 10 is less wetted and hardly eroded, so the life is long.

  The supply amount control of the molten metal 10 in the non-ferrous metal molten metal supply apparatus 1 according to the present invention includes two types of independent molten metal: measurement at the tubular piston shaft 4 and measurement at the molten metal leakage portion 8b in the molten metal intake cylinder 2. Since the flow rate of the molten metal 10 can be calculated using a non-contact laser measurement method, the accuracy and reliability are high. Further, since the computer control can be adopted to perform the flow rate control at the rising speed and the position of the molten metal intake cylinder 2, the control characteristics can be improved.

  In the field of die casting of non-ferrous metals such as aluminum alloys or zinc alloys, it is possible to control the hot water supply in a fixed quantity or variable amount in the molten metal supply from the molten metal furnace to the die casting machine, and it can be applied and used regardless of old and new equipment.

1. Molten metal supply device 2: Molten metal intake cylinder 2a: Molten metal inflow hole 2b: Cylinder elevating arm 2c: Support arm 3: Piston 4: Tubular piston shaft 4a: T-shaped vent 4b: Support arm 5: Molten outflow pipe 6: Cylinder elevating drive Device 7: Laser distance measuring device 7a: Laser beam 7b: Molten metal rising part 8: Laser distance measuring device 8a: Laser beam 8b: Molten metal leaking part 9: Mount 10: Molten metal 10a: Molten metal surface 20: Hand-held furnace 21; Open mouth α: Up β: Down

Claims (3)

A non-ferrous metal melt supply device that measures non-ferrous metal melt and supplies it to a casting machine, wherein a plurality of melt inflow holes are provided at the top, and at least a portion including the melt inflow holes is immersed in the melt of the melt furnace. A molten metal intake cylinder, a piston that is inserted into the molten metal intake cylinder and is fitted to the lower end of a tubular piston shaft that is connected to the upper portion of the molten metal outlet pipe and a T-shape, and a drive means that raises and lowers the molten metal cylinder. the same level as the melt surface in the furnace holds the piston lower surface, lowers the melt cylinder from the melt inlet to a position where the molten metal flows, after charged with molten metal into the molten metal cylinder, raising the molten metal cylinder Accordingly, the non-ferrous metal melt supply apparatus is characterized in that the melt inside the melt cylinder is discharged from the melt outflow pipe via the tubular piston shaft and supplied to the casting machine. Wherein in the melt intake cylinder, a laser distance measuring device irradiates aiming the piston top surface portion provided above the molten metal inlet cylinder, by measuring the level of the molten metal coming from leaking to the piston upper surface along the solution water intake cylinder inner wall Calculating the amount of molten metal leaking between the cylinder and the piston and calculating the amount of molten metal discharged through the tubular piston shaft by correcting to subtract the amount of molten metal leakage from the calculated amount of molten metal discharged due to the rise of the molten metal intake cylinder. The non-ferrous metal melt supply device according to claim 1. The laser distance measuring device for irradiating a tubular piston in the axis in the axial direction provided above the tubular piston axis, the flow rate of the molten metal into the tubular piston shaft via a casting machine that is discharged from the molten metal outlet pipe, tubular 2. The non-ferrous metal melt supply according to claim 1, wherein the amount of melt supplied to the casting machine is controlled by measuring the level of the melt surface in the piston shaft and controlling the melt to a target melt level. apparatus

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