JP4869446B2 - Casting equipment - Google Patents

Description

  Embodiments described herein relate generally to a casting apparatus that applies a release agent to a mold.

  In die-cast molding in which casting is performed using a mold, a release agent may be applied to the inner surface of the mold cavity. In the case of supplying a release agent, there is a casting apparatus in which a cavity is decompressed by a vacuum pump and a powder release agent or a release agent obtained by misting a liquid by an atomizer is supplied into the cavity. In any casting apparatus, surplus mold release agent is collected by a cyclone type mold release agent collecting machine installed between the mold and the vacuum pump.

JP 2007-69218 A Japanese Patent No. 2927925

  When casting a metal material having a high casting temperature condition, the mold release agent applied to the mold is likely to evaporate because the set temperature of the mold and the molten metal before casting is high. The evaporated release agent increases the pressure in the cavity. Therefore, in order to maintain the degree of vacuum in the cavity and allow the molten metal to flow uniformly through the mold, it is necessary to continuously draw the gas containing the release agent vapor with a vacuum tank or a vacuum pump. At this time, if the temperature of the sucked gas is high, the temperature of the release agent recovery machine gradually increases when the casting apparatus is operated for a long time. As a result, the release agent passes through the release agent recovery machine in the form of vapor and cannot be recovered efficiently.

  Therefore, the present invention provides a casting apparatus including a release agent recovery machine that efficiently recovers a release agent even when the set temperature of a mold or a molten metal is high.

The casting apparatus of the embodiment includes a mold, a vacuum pump, a release agent recovery machine, and a cooling pipe . A mold release agent is applied to the inner surface of the mold. The vacuum pump is connected to the mold by piping, and sucks out gas containing the vaporized release agent inside the cavity. The release agent recovery machine is connected to a pipe and generates a swirling flow from an intake port provided in the lower part to an exhaust port provided in the upper part to separate the release agent from the gas. The cooling pipe is wound around the guy wall of the release agent recovery machine.

Schematic which shows the casting apparatus of 1st Embodiment. Sectional drawing which follows the vertical direction of the mold release agent collection | recovery machine shown in FIG. Sectional drawing which follows the horizontal direction of the mold release agent collection | recovery machine shown in FIG. Sectional drawing which shows the mold release agent collection | recovery machine of the casting apparatus of 2nd Embodiment. Sectional drawing which shows the mold release agent collection | recovery machine of the casting apparatus of 3rd Embodiment.

  The casting apparatus of 1st Embodiment is demonstrated with reference to FIGS. 1-3. The casting apparatus 1 shown in FIG. 1 includes a mold 10, a plunger 3, a molten metal tank 31, a suction pipe 102, a valve 103, a vacuum pump 4, a vacuum tank 40, a release agent recovery machine 5, a cooling device 50, Is provided. The mold 10 is divided into a first mold 11 and a second mold 12 along a product dividing line. The first mold 11 and the second mold 12 have a first mold surface 111 and a second mold surface 121 at their joint surfaces. The first mold surface 111 and the second mold surface 121 form a cavity C for casting a product by combining the first mold 11 and the second mold 12. A release agent 14 is applied to the inner surface of the cavity C. The mold 10 has a melt supply port 2 and a suction port 101 communicating with the cavity C.

  As shown in FIG. 1, the plunger 3 is connected to a molten metal tank 31 in which a molten metal M is stored. The discharge port 32 of the plunger 3 is connected to the melt supply port 2 and supplies the melt M from the melt tank 31 to the cavity C. If the plunger side of the mold 10 provided with the molten metal supply port 2 is upstream, the suction port 101 is disposed downstream of the molten metal flow. The vacuum pump 4 is connected to the suction port 101 by a suction pipe 102. A valve 103, a release agent recovery machine 5, and a vacuum tank 40 are attached to the suction pipe 102 between the suction port 101 and the vacuum pump 4 in order from the suction port 101 side.

  The valve 103 communicates or blocks the path to the vacuum pump 4. The vacuum tank 40 has a volume sufficiently larger than the combined volume of the cavity C and the release agent recovery machine 5. The vacuum tank 40 is depressurized by the vacuum pump 4, and the valve 103 is opened to communicate with the cavity C, whereby the gas G including the vaporized release agent 14 inside the cavity C is sucked out at a stroke. If the exhaust capability of the vacuum pump 4 is sufficient to suck out the gas G in the cavity C, the vacuum tank 40 may be omitted.

  As shown in FIG. 1, the release agent recovery machine 5 is connected between the valve 103 and the vacuum tank 40 in the middle of the suction pipe 102 from the mold 10 to the vacuum pump 4. As shown in FIGS. 1 and 2, the release agent recovery machine 5 has an intake port 51 in the lower part and an exhaust port 52 in the upper part. Further, the release agent collecting machine 5 has a filter 53 between the intake port 51 and the exhaust port 52. The gas G guided to the suction pipe 102 generates a spiral swirl flow S from the lower intake port 51 toward the upper exhaust port 52 along the inner surface of the outer peripheral wall 54 of the release agent recovery machine 5. The intake port 51 and the exhaust port 52 are opened along the inner surface of the outer peripheral wall 54 and the direction of the swirl flow S.

  When the valve 103 is opened, the gas G in the cavity C flows into the release agent recovery machine 5 at once. The release agent recovery machine 5 separates the liquefied release agent 14 in the gas G by the centrifugal force of the swirl flow S. The outer peripheral wall 54 of the mold release agent recovery machine 5 shown in FIGS. 1 and 2 has a conical shape whose diameter decreases from the lower part toward the upper part. The swirl flow S caused by the gas G gradually decreases in the radius of rotation and increases in the number of revolutions as it goes toward the exhaust port 52. As a result, the release agent 14 having a small particle size is also recovered. The gas after the release agent 14 is separated is discharged from the vacuum pump 4 through the suction port 102 and the vacuum tank 40 from the exhaust port 52. Sludge D collected at the bottom such as the collected release agent 14 is discharged from the drain 55 at the bottom.

  The cooling device 50 includes a cooling pipe 501 wound around the outer peripheral wall 54 of the mold release agent recovery machine 5 and a circulation pump 502 that causes the refrigerant A to flow through the cooling pipe 501. By flowing the refrigerant A by the circulation pump 502, the outer peripheral wall 54 of the release agent recovery machine 5 is cooled. At this time, the cooling pipe 501 is spirally wound from the upper part to the lower part of the outer peripheral wall 54 of the release agent recovery machine 5. Since the lower part on the inlet 51 side of the release agent recovery machine 5 is close to the cavity C, the temperature of the gas G is high. And the temperature of gas G is cooled and goes low as it goes to the exhaust port 52. The refrigerant A flows spirally along the cooling pipe 501 from the upper part to the lower part.

  That is, the cooled refrigerant A is provided to the gas G having a low temperature, and the refrigerant A that has been warmed by absorbing the heat of the gas G before flowing to the lower part is provided to the gas G having a high temperature. Since the difference in the temperature of the refrigerant A with respect to the temperature of the gas G flowing from the inlet 51 to the outlet 52 in the release agent recovery machine 5 is maintained above a certain level, the efficiency of cooling the gas G is good. In the case of the vacuum casting apparatus 1 in the first embodiment, as shown in FIG. 3, the refrigerant A flows in a rotation direction opposite to the rotation direction of the swirl flow S of the gas G flowing in the release agent recovery machine 5. As described above, the cooling pipe 501 of the cooling device 50 is wound. By arranging the cooling pipe 501 in this way, the gas G can be efficiently cooled. As a result, the release agent in the gas G is easily condensed and the recovery efficiency of the release agent is increased.

  As shown in FIG. 1, the control device 6 is connected to the valve 103, the circulation pump 502, the vacuum pump 4, and the plunger 3 to control these operations. The control device 6 performs control based on measurement values of a mold temperature sensor 104 attached to the mold 10, a melt temperature sensor 33 provided in the melt tank 31, and a pressure gauge 41 provided in the vacuum tank 40.

  The casting apparatus 1 configured as described above is based on the measured values of the mold temperature sensor 104 and the molten metal temperature sensor 33, the molten metal supply speed of the plunger 3 and the opening rate of the valve 103, and the circulation pump 502 and the vacuum. By controlling the pump 4, the release agent 14 is efficiently separated from the gas G drawn from the cavity C in the release agent recovery machine 5 and recovered. FIG. 1 shows an embodiment of the casting apparatus 1 and is not limited to one in which each component is described, but it is allowed to change the arrangement of each component or add another component.

  The release agent recovery machine 5 of the casting apparatus 1 according to the second embodiment will be described with reference to FIG. The mold release agent recovery machine 5 shown in FIG. 4 is different from the mold release agent recovery machine 5 of the first embodiment in the shape of the outer peripheral wall 54. In the second embodiment, the outer peripheral wall 54 of the release agent recovery machine 5 has a conical shape whose diameter increases from the lower part toward the upper part as shown in FIG. Since the other configuration of the casting apparatus 1 is the same as that of the first embodiment, the same reference numerals are given in the drawing, the description thereof will be omitted, and the description of the first embodiment and Consider the drawing.

  The swirl flow S of the gas G flowing in the release agent recovery machine 5 configured in this way has a high rotation speed at the lower part with a small turning radius and a low rotation speed at the upper part with a large turning radius. The gas G exiting from the inlet 51 immediately after being sucked out from the cavity C has a high temperature, and the condensation of the release agent 14 does not proceed. That is, the particle size of the release agent 14 contained in the gas G is small. Since the inlet 51 is located in the lower portion where the rotational speed of the swirl flow S is large, that is, the rotation speed is fast, even the release agent 14 having a small particle size can be centrifuged by the swirl flow S. As the gas G moves upward, the rotational radius of the swirl flow S increases and the temperature of the gas G decreases by the cooling device 50. Condensation of the release agent 14 proceeds and the particle size increases. Therefore, even if the gas G approaches the exhaust port 52 and the rotational speed of the gas G decreases, the release agent 14 can be efficiently separated from the gas G and recovered.

  The release agent recovery machine 5 of the casting apparatus 1 according to the third embodiment will be described with reference to FIG. The release agent recovery machine 5 shown in FIG. 5 is different from the release agent recovery machine 5 of the first embodiment in the shape of the outer peripheral wall 54. In the third embodiment, the outer peripheral wall 54 of the release agent recovery machine 5 is a cylindrical shape whose diameter does not change from the lower part to the upper part as shown in FIG. Since the other configuration of the casting apparatus 1 is the same as that of the first embodiment, the same reference numerals are given in the drawing, the description thereof will be omitted, and the description of the first embodiment and Consider the drawing.

  The swirl flow S of the gas G flowing through the release agent recovery machine 5 configured as described above has a constant rotation speed because the rotation radius does not change from the lower part to the upper part. The swirl flow S is stable from the intake port 51 to the exhaust port 52, and the contact time between the gas G and the outer peripheral wall 54 is also constant. Since the condensation of the release agent 14 in the gas G to be cooled is stably promoted, the release agent 14 can be efficiently recovered.

  The casting apparatus 1 of each embodiment includes a release agent recovery machine 5 that can efficiently recover the release agent 14 vaporized in the cavity C. Therefore, this casting apparatus 1 equipped with the mold release agent recovery machine 5 can also be used for vacuum casting of magnesium alloy or the like in which the casting temperature condition is higher than that of the aluminum alloy. Further, in any release agent recovery machine 5 shown in each of the above-described embodiments, the object to be recovered is not only the release agent 14 but also fumes from which the metal supplied by the molten metal M has evaporated, Including atmospheric moisture.

  A number of embodiments of the invention have been described. These embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

The invention described in the claims of the original application immediately before the division will be added below.
A mold in which a release agent is applied to the inner surface of the cavity;
A plunger for supplying a molten metal material to the cavity;
A vacuum pump connected to the mold by piping and sucking out the gas containing the release agent vaporized inside the cavity;
A release flow connected to the pipe and separating the liquefied release agent by generating a swirling flow from an intake port installed at a lower portion to an exhaust port installed at an upper portion, and discharging the remaining gas from the exhaust port. Mold recovery machine;
A casting apparatus comprising: a cooling pipe wound around an outer peripheral wall of the release agent recovery machine.

  DESCRIPTION OF SYMBOLS 1 ... Casting apparatus, 3 ... Plunger, 4 ... Vacuum pump, 5 ... Release agent collection | recovery machine, 51 ... Intake port, 52 ... Exhaust port, 53 ... Filter, 54 ... Outer peripheral wall, 10 ... Mold, 14 ... Release Agent, 31 ... Molten tank, 50 ... Cooling device, 501 ... Cooling pipe, 102 ... Suction pipe, C ... Cavity, M ... Molten metal, G ... Gas, S ... Swirling flow, A ... Refrigerant.

Claims (9)

A mold in which a release agent is applied to the inner surface of the cavity;
A vacuum pump connected to the mold by piping and sucking out the gas containing the release agent vaporized inside the cavity;
A release agent recovery machine connected to the pipe and generating a swirling flow from an intake port provided at a lower portion to an exhaust port provided at an upper portion to separate the release agent from the gas;
A casting apparatus comprising: a cooling pipe wound around an outer peripheral wall of the release agent recovery machine . A mold in which a release agent is applied to the inner surface of the cavity;
A vacuum pump for sucking out the gas containing the release agent vaporized in the cavity;
A release agent recovery machine for generating a swirling flow for separating the release agent from the gas sucked by the vacuum pump, including an intake port provided in the lower part and an exhaust port provided in the upper part ;
A casting apparatus comprising: a cooling pipe wound around an outer peripheral wall of the release agent recovery machine . The casting apparatus according to claim 1, wherein the release agent recovery machine includes a filter between the intake port and the exhaust port. Before SL cooling tube, the releasing agent harvester of the outer peripheral wall casting apparatus described from top to claim 1 or claim 2 are wound in a spiral shape toward the bottom of the. Before SL cooling tube, cast as described in the releasing agent harvester the outer peripheral upper winding in the opposite direction of the spiral and the swirling flow toward the bottom from the wound to which claim 1 or claim wall 2 of apparatus. 3. The casting apparatus according to claim 1, wherein an outer peripheral wall of the release agent recovery machine has a conical shape whose diameter decreases from the lower part toward the upper part. 3. The casting apparatus according to claim 1, wherein the outer peripheral wall of the release agent recovery machine has a conical shape whose diameter increases from the lower part toward the upper part. The casting apparatus according to claim 1, wherein an outer peripheral wall of the release agent recovery machine has a cylindrical shape. The casting apparatus according to claim 1 or 2 , wherein the intake port and the exhaust port of the release agent recovery machine are opened along the inner surface of the outer peripheral wall and the direction of the swirling flow.

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