JP4481945B2 - Casting mold and casting method - Google Patents

Description

The present invention is a first mold in which a gate is formed , and a split mold in which a cavity communicating with the gate through the gate in an initial state is formed, the mold opening direction being the first mold The present invention relates to a casting mold provided with a second mold that is in a direction orthogonal to the moving direction , and a casting method performed using the casting mold.

  Generally, a casting mold has a product part which is a cavity in which a cast product is formed, and a plan part for feeding molten metal into the product part. The plan section includes a spout for injecting molten metal, a strainer for preventing the mixing of the molten metal, a runner that guides the molten metal to the vicinity of the product section, and a gate (also referred to as a weir) that communicates from the runway to the product section. The plan part tends to have a shorter life as compared with the product part because the thermal shock (impact due to thermal expansion or the like) due to the molten metal and the physical impact due to the movement of the molten metal are large.

  As described above, since the life of the plan part and the life of the product part are different, in the casting mold described in Patent Document 1, the first mold corresponding to the plan part and the second mold corresponding to the product part are separately provided. Provided. According to this casting mold, only the first mold that has reached the end of its life can be replaced, which is preferable because it can reduce the labor and cost of replacement. Patent Document 1 also proposes a configuration in which no flash is generated on the mating surface between the first mold and the second mold.

Japanese Patent Laid-Open No. 11-207435

  By the way, in the casting mold described in Patent Document 1, the second mold corresponding to the product part is rarely replaced, but the first mold corresponding to the design part is compared with the second mold. Then you have to change frequently.

  In addition, when the gate and runner are extended in the vertical direction, when pouring the molten metal, the potential energy of the molten metal is received at the bottom of the gate and the runway, resulting in a large physical impact. It becomes a factor of life shortening. For this reason, it is desired to further extend the life of the first mold corresponding to the plan part.

  Furthermore, when the gate and the runner are partly close to or in parallel with the product part, the product part receives a thermal shock from the gate and the runner, and the second mold In some cases, the service life of the second mold may be reduced, and it is desired to extend the service life of the second mold.

  The present invention has been made in consideration of such problems, and is a casting mold in which a first mold corresponding to a design part and a second mold corresponding to a product part are separately provided. It is an object of the present invention to provide a casting mold and a casting method capable of suppressing the thermal shock and physical shock caused by the molten metal and extending the service life.

Casting mold according to the present invention comprises a first mold sprue is formed, a split mold cavity is formed which communicates via a gate to the sprue in the initial state, the mold opening direction A second mold that is perpendicular to a moving direction of the first mold; and a moving unit that moves the first mold along the extending direction of the gate. And a recess which is inclined with respect to the axis and communicates with the gate.

In this way, by moving withdrawal along a first mold gate by moving means after pouring, thermal expansion of the expansion or the first mold itself of the molten metal is absorbed, thermal shock to the first mold is mitigated The In addition, since the pouring gate includes a recess that is inclined with respect to the axis of the cavity and communicates with the gate, the molten metal to be poured does not fall at least freely. The physical impact is mitigated.

In this case, the cavity has an elongated shape, and the gate and the angle in the extending direction of the cavity can be set shallow when the gate is in the range of up to 30 ° including the horizontal, In addition, the flow of the molten metal becomes gentle and the physical impact is further alleviated.

  The second mold is a split mold, and if the mold opening direction is set in a direction orthogonal to the moving direction of the first mold, the mold opening is easy.

  Mold expansion detecting means for detecting or estimating the expansion of the first mold; and when the mold expansion detecting means detects or estimates that the first mold has expanded, You may have a control means to move a 1st metal mold | die.

  By this mold expansion detection means, the first mold can be moved at an appropriate timing, and the first mold can have a longer life.

  When the molten metal poured from the gate is solidified, it detects that the volume expansion in the solidification temperature range is detected or estimated, and detects that the molten metal has expanded by the molten metal expansion detecting means. Alternatively, it may have a control means for moving the first mold by the moving means when estimated. By this molten metal expansion detecting means, it is possible to detect and estimate that the molten metal has undergone volume expansion in the solidification temperature region, and to move the first mold at an appropriate timing.

  When the molten metal poured from the gate is solidified, the solidification detecting means for detecting or estimating that the surface layer has become a shell-shaped solidified layer, and detecting that the surface layer of the molten metal has solidified by the solidification detecting means or Control means for moving the first mold by the moving means when estimated. By this solidification detecting means, it is possible to detect and estimate that the molten metal has undergone volume expansion in the solidification temperature region, and to move the first mold at an appropriate timing.

  When detecting or estimating that the surface layer of the molten metal has become a shell-shaped solidified layer, the moving means may separate the first mold from the second mold. As a result, the stress due to thermal expansion is released from the first mold, thereby further extending the life. Moreover, since the surface layer of the molten metal is solidified in a shell shape, the molten metal inside does not leak out.

Then, casting method according to the present invention comprises a first mold sprue is formed, a split mold cavity is formed which communicates via a gate to the sprue in the initial state, mold opening A second mold whose direction is a direction orthogonal to the moving direction of the first mold, and the gate includes a recess inclined to the axis of the cavity and communicating with the gate, A casting method performed using the first mold and the second mold, wherein when the molten metal poured from the gate is solidified, the molten metal expansion detection means indicates that the volume has expanded in the solidification temperature range. A step of detecting or estimating, and when detecting or estimating that the molten metal has expanded by the molten metal expansion detecting means, the first mold is moved by the moving means along the extending direction of the gate. And providing a gap between the second mold and Characterized in that it has.

  Thus, by detecting or estimating that the molten metal has undergone volume expansion in the solidification temperature range by the solidification detection means, the first mold is moved at an appropriate timing, and the first mold has a longer life. can do.

In addition, the casting method according to the present invention includes a first mold in which a pouring gate having a non-vertical pouring direction is formed, and a split mold in which a cavity communicating with the pouring gate through the gate in an initial state is formed. The mold opening direction is a direction perpendicular to the moving direction of the first mold, and the gate is inclined with respect to the axis of the cavity and communicates with the gate. A casting method that uses the first mold and the second mold to form a shell-shaped solidified layer when the molten metal poured from the gate is solidified. Detecting or estimating this by the solidification detecting means, and when detecting or estimating that the surface layer of the molten metal has solidified by the solidification detecting means, the first means by the moving means along the extending direction of the gate. Move the mold to create a gap with the second mold And having a second step that.

  In this way, by detecting or estimating that the surface layer of the molten metal has become a shell-shaped solidified layer by the solidification detecting means, the first mold is moved at an appropriate timing, and the first mold has a longer life. can do.

According to the casting mold and casting method according to the present invention, by Rukoto a gap between the second mold the first mold is moved along the gate by the moving means after pouring, expansion of the molten metal And the thermal expansion of the first mold itself is absorbed, and the thermal shock to the first mold is mitigated. In addition, since the molten metal poured in the pouring direction of the pouring gate does not fall at least freely, the potential energy of the molten metal does not act directly on the design part, Physical shock is alleviated. Furthermore, the molten metal is poured slowly, so that the air is less involved in the molten metal and the formation of nests is suppressed.

By detecting or estimating that the surface layer of the molten metal has become a shell-shaped solidified layer by the solidification detecting means, or that the molten metal has undergone volume expansion in the solidification temperature range, the first mold is moved at an appropriate timing. As a result of moving and providing a gap with the second mold, the first mold can have a longer life.

  DESCRIPTION OF EMBODIMENTS Hereinafter, a casting mold and a casting method according to the present invention will be described with reference to FIGS.

  As shown in FIG. 1, a casting mold 10 according to the present embodiment is applied to a casting system 12 for casting a crankshaft that is an engine component. Furthermore, the camshaft etc. which are engine parts can also be casted suitably.

  The casting system 12 includes a casting mold 10 provided substantially at the center, and a pouring station 26 for pouring molten metal into the casting mold 10.

  The pouring station 26 includes a pressurized pouring furnace 28, a weight meter 30, and a ladle 32 that receives the molten metal discharged from the pressurized pouring furnace 28 and pours the molten metal into the casting mold 10. After setting the amount of molten metal in the ladle 32 to a certain amount, the ladle 32 is moved onto the casting mold 10 and poured into the cavity (product part) 50 from the gate 62a (see FIG. 2). ing.

  In the pressurized pouring furnace 28, the molten metal generated in the melting furnace 34 disposed further upstream is supplied through a conveying ladle 36. Further, an additive metering device 38 for adding an additive such as magnesium for spheroidizing graphite to the molten metal is provided above the casting mold 10. Adjacent to the additive metering device 38, a blow smoke device 40 for applying a release material on the cavity surface is provided so as to be movable up and down.

  Above the downstream side of the casting mold 10, a workpiece take-out robot 42 for taking out the cast product from the opened mold is provided so as to be movable in the horizontal direction, and the taken cast product is transferred to the correction / cutting device 44.

  The cast product is trimmed by the correction / cutting device 44 and then transferred to the heat treatment furnace by the transfer robot 46 by the conveyor 48.

  As shown in FIG. 2, the casting mold 10 includes a product mold (second mold) 52 having a cavity 50 and a design part mold (first mold) having a design section 62 for introducing molten metal to the cavity 50. Type) 56. The cavity 50 is provided with a gas vent hole (not shown). The cavity 50 has an elongated shape that matches the crankshaft, and the extending direction of the cavity 50 and the gate 62b is horizontal. Therefore, the product mold 52 and the design part mold 56 can be configured low. . For example, when the direction in which the cavity 50 and the gate 62b extend is set to an angle range of 30 ° including the horizontal and upward, the flow of the molten metal becomes gentle and the physical impact on each mold is alleviated.

  The product mold 52 is a divided mold that is divided into a lower mold 52a and an upper mold 52b with the cavity 50 as a boundary, and is made of a metal (for example, copper alloy) having good thermal conductivity. The lower mold 52a is a fixed mold fixed to the floor surface via the lower base 55a. The upper mold 52b is a movable mold that can be moved up and down by two cylinders 58a and 58b via an upper base 55b. The cavity 50 is formed by lowering the upper mold 52b and coming into contact with the lower mold 52a, and the cast product can be extracted from the cavity 50 by raising. The lower base 55a and the upper base 55b are made of a metal such as cast iron or steel.

  The design part mold 56 includes a gate part lower mold 60a that contacts the surface of the lower mold 52a on the arrow A1 side, a gate part upper mold 60b that contacts the side surface of the upper mold 52b, the gate part lower mold 60a, and the gate part upper part. It consists of a gate forming die 60c that is in contact with the surface on the arrow A1 side of the die 60b (hereinafter also referred to collectively as the gate die 61). In the design part mold 56, a design part 62 is formed by the gate part lower mold 60a, the gate part upper mold 60b, and the gate forming mold 60c. The design part 62 has a gate 62a opened on the upper surface, and a gate 62b communicating with the cavity 50 from the gate 62a. The design unit 62 may be provided with a runner and a strainer.

  The gate 62 b is a horizontal narrow passage formed by a depression on the upper surface of the lower gate part mold 60 a and a depression on the lower surface of the upper gate part mold 60 b, and is set coaxially with the cavity 50.

  The gate 62a is formed by a side surface of the gate part upper mold 60b and a recess 63a provided from the side surface to the upper surface of the gate forming mold 60c. The side surface of the gate part upper mold 60b and the surface of the recess 63a are inclined toward the upper left direction in FIG. 2, and the gate 62a is a generally inclined (non-vertical) passage. The lowest part of the gate 62a is provided with a horizontal and short bottom part 63b, and the bottom part 63b and the lower surface of the gate 62b are set at substantially the same height.

  The casting mold 10 has a cylinder (moving means) 64 that moves the gate forming mold 60c in the extending direction of the gate 62b (that is, in the horizontal direction and the axial direction of the cavity 50). Since the movement direction of the gate forming mold 60c by the cylinder 64 and the mold opening direction of the product mold 52 are orthogonal to each other, the product mold 52 can be easily opened. That is, when the product mold 52 receives heat, the product mold 52 easily expands in a direction orthogonal to the mold opening direction of the product mold 52. If it is (that is, the direction of mold opening), the expansion of the product mold 52 is easily absorbed.

  When the gate 60c is pressed in the direction of the arrow A2 under the action of the cylinder 64, the side surface in the direction of the arrow A2 and the side surface below the bottom 63b abuts the side surface of the gate portion lower mold 60a, and the side surface in the direction of the arrow A2 Thus, the side surface above the bottom portion 63b contacts the side surface of the gate portion upper mold 60b, and the recess 63a forms a part of the gate 62a. Since the design part mold 56 is configured low, the gate 62a is also formed shallow.

  Further, when the gate forming die 60c moves in the direction of the arrow A1 under the action of the cylinder 64, the gap G can be provided away from the gate lower die 60a and the gate upper die 60b (see FIG. 4).

  The cylinder 64 operates through the valve 72 under the action of the controller 70. The controller 70 also includes a pressure sensor 74 that measures the internal pressure of the cylinder 64, a strain sensor 76 that measures distortion of the gate forming mold 60c, a displacement meter 78 that measures minute displacement of the gate forming mold 60c, and a gate forming mold. It is connected to the thermometer 80 that measures the temperature in the vicinity of the contact portion with respect to the gate portion lower mold 60a and the gate portion upper mold 60b in 60c. Instead of the pressure sensor 74, a load cell that measures the force with which the cylinder 64 presses the gate forming mold 60c may be used. The measurement target by the strain sensor 76, the displacement meter 78, and the thermometer 80 may be the lower gate portion mold 60a or the upper gate portion mold 60b.

  Although not shown, the controller 70 is also connected to other parts of the casting system 12, and performs overall control. A timer is provided inside the controller 70.

  The controller 70 can control the cylinder 64 based on signals from the pressure sensor 74, the strain sensor 76, the displacement meter 78, the thermometer 80, and a timer.

  Next, a casting method for casting the crankshaft using the casting system 12 including the casting mold 10 configured as described above will be described with reference to FIG.

  First, in step S1, the casting mold 10 is initially set. That is, the cavity 50 is formed by bringing the upper mold 52b into contact with the lower mold 52a under the action of the cylinders 58a and 58b. Further, the rod 64a of the cylinder 64 is advanced in the direction of the arrow A2, and the gate forming mold 60c is brought into contact with the side surface of the gate mold 61 to form the gate 62a. Thereafter, the cast iron is melted to form a molten metal and stored in the ladle 32 by a predetermined process.

  Further, the controller 70 operates the valve 72 while referring to the signal from the pressure sensor 74 to set the inside of the cylinder 64 to a predetermined pressure P.

In step S2, the molten metal in the ladle 32 is poured into the gate 62a. The poured molten metal flows into the cavity 50 through the gate 62b. At this time, since the molten metal flows along the surface of the recess 63a, moreover sprue 62a is shallow because the recess 63 a is inclined, physical acts directly is the potential energy of the molten metal to the bottom 63b There is no impact. In addition, the molten metal is poured slowly, and there is little air entrainment in the molten metal, and nest formation is suppressed.

  That is, since the molten metal flow direction of the pouring gate 62a is non-vertical, the molten metal to be poured does not fall at least freely, so that the potential energy of the molten metal directly acts on the design part 62. There is no physical shock.

  The molten metal is sufficiently poured until the surface of the molten metal reaches a predetermined height of the gate 62a. Thus, by pouring the molten metal into the cavity 50 through the gate 62a and the gate 62b, the casting mold 10 is rapidly heated and receives a thermal shock. Further, since the casting mold 10 forms a long crankshaft, the casting mold 10 is long in the axial direction, and the thermal expansion is greatly expanded in the axial direction (that is, the horizontal direction).

  On the other hand, when cast iron solidifies as gray cast iron, it is known to expand during eutectic solidification, and the molten metal itself also expands in the casting mold 10. Moreover, since the cavity 50 filled with the molten metal is long, when the molten metal solidifies, it particularly expands greatly in the axial direction. The solidification shrinkage of gray cast iron is given by the difference between the shrinkage during crystallization of primary austenite and the expansion during eutectic solidification.

  Thus, by pouring the molten metal from the gate 62a, the product mold 52 is thermally expanded, and the molten metal poured into the cavity 50 is expanded when it is solidified. A force in the direction of arrow A1 is applied to. Therefore, distortion occurs in the gate forming mold 60c and the internal pressure of the cylinder 64 is increased.

  Further, the controller 70 detects the pouring of water by an appropriate means, and starts counting by an internal timer.

  In step S3, the controller 70 monitors the signal of the pressure sensor 74 and confirms whether or not the internal pressure of the cylinder 64 has exceeded a predetermined threshold pressure Ps. The threshold pressure Ps is set according to two conditions. That is, as the first condition, the threshold pressure Ps is a pressure slightly higher than the initially set pressure P, and the product mold 52 expands due to heat or expands when the molten metal solidifies. Therefore, it is considered that the internal pressure of the cylinder 64 can be increased and reached immediately after the design part mold 56 starts to receive the force in the direction of the arrow A1. Further, as a second condition, the surface layer of the molten metal is solidified to form a shell 100 (see FIG. 4), and an unsolidified (or semi-solidified) portion remains inside. Be considered. The internal pressure of the cylinder 64 when satisfying these two conditions is set in advance as the threshold pressure Ps.

  When the internal pressure of the cylinder 64 exceeds the threshold pressure Ps, the process proceeds to step S8, and when the internal pressure of the cylinder 64 has not reached the threshold pressure Ps, the process proceeds to step S4.

  In step S4, the controller 70 monitors the signal of the strain sensor 76 and confirms whether or not the strain S of the gate forming mold 60c exceeds a predetermined threshold value Ss. This threshold value Ss is set according to two conditions. That is, as the first condition, the threshold value Ss is a slightly larger strain as compared with the initial strain S being 0, and when the design part mold 56 expands due to heat or the molten metal solidifies. It is considered that the gate forming mold 60c is distorted and can be reached immediately after the thermal stress starts to occur due to expansion. The second condition is the same as the second condition related to the threshold value Ps. The distortion of the gate forming mold 60c when satisfying these two conditions is set in advance as the threshold value Ss.

  When the distortion S of the gate forming mold 60c exceeds the threshold value Ss, the process proceeds to step S8, and when the threshold value Ss is not reached, the process proceeds to step S5.

  In step S5, the controller 70 monitors the signal of the displacement meter 78 to confirm whether or not the displacement A of the gate forming mold 60c has exceeded a predetermined threshold value As. This threshold value As is set according to two conditions. That is, as the first condition, the threshold value As is a slight displacement in the direction of the arrow A1 as compared with the initial position, and the product mold 52 expands due to heat or expands when the molten metal solidifies. Thus, it is considered that the gate forming mold 60c can be reached immediately after starting to be displaced due to thermal strain. The second condition is the same as the second condition related to the threshold value Ps. The displacement of the gate forming mold 60c when satisfying these two conditions is set in advance as the threshold value As.

  When the displacement A of the gate forming mold 60c exceeds the threshold value As, the process proceeds to step S8, and when the threshold value As is not reached, the process proceeds to step S6.

  In step S6, the controller 70 monitors a timer to check whether or not a predetermined threshold time Ts has elapsed since pouring. This threshold value Ts is set in advance as a time during which the gate forming mold 60c is subjected to a predetermined thermal strain and a time during which the second condition relating to the threshold value Ps is satisfied.

  When the time T from pouring has exceeded the threshold value Ts, the process proceeds to step S8, and when it has not elapsed, the process proceeds to step S7.

  In step S7, the controller 70 monitors the signal from the thermometer 80 and confirms whether or not the temperature C at a predetermined location of the gate forming mold 60c has decreased to a predetermined threshold temperature Cs. This threshold value Cs is set in advance as a time when the second condition relating to the threshold value Ps is satisfied.

  When the temperature C is lower than the threshold temperature Cs, the process proceeds to step S8, and otherwise, the process returns to step S3.

  By the processing of these steps S3 to S7, the pressure sensor 74, the strain sensor 76 and the displacement meter 78, the thermometer 80, and the timer respectively detect mold expansion detecting means for detecting or estimating the expansion of the gate forming mold 60c, Melt expansion detection means for detecting or estimating the volume expansion in the solidification temperature range when the molten metal solidifies, and solidification for detecting or estimating that the surface layer of the molten metal has become a shell-like solidified layer It will act as a detection means.

  While repeating the loop of steps S3 to S7, the internal pressure of the cylinder 64, the distortion S, the displacement A, the temperature C, and the time T of the gate forming mold 60c are monitored, and the corresponding threshold values Ps, Ss, As, Cs, and Ts are monitored. If exceeded, the process proceeds to step S8.

  In step S8, the controller 70 operates the cylinder 64 through the valve 72 to slightly move the rod 64a in the direction of the arrow A1, and separates the gate forming die 60c from the gate die 61 as shown in FIG. A gap G is provided.

  In this way, by moving the gate forming mold 60c in the direction of the arrow A1 to provide the gap G, the thermal expansion of the product mold 52 and the gate mold 61 and the heat to the gate forming mold 60c caused by the expansion of the molten metal during solidification. Impact can be mitigated. In addition, since the shell 100 is formed at this time, the internal melting does not leak to the outside. Furthermore, by setting the gap G to be appropriately short, the shell 100 is not damaged or cracked by the influence of its own weight or the like, and the molten metal inside is securely held inside the shell 100.

  Further, since the direction (arrow A direction) in which the gate forming mold 60c is moved is along the extending direction of the gate 62b, no shearing force or twisting force is applied to the partially solidified molten metal in the gate 62b. It can move smoothly and does not damage the solidified surface layer.

  In step S9, the process waits until the molten metal filled in the cavity 50 or the like is solidified (or cooled by a predetermined means), and the upper mold 52b is raised by the cylinders 58a and 58b after solidification. Although an example of waiting until the molten metal has solidified has been shown, the waiting time may be a time until the shell 100 grows to a shell 100 that is hard enough to be damaged even if it receives its own weight. After the formation of the hard shell 100, the upper mold 52b may be raised by the cylinders 58a and 58b. Thereby, the thermal shock with respect to the product metal mold | die 52 which forms the cavity 50 can be relieved.

  Further, the cast product obtained at the place where the cavity 50 has been formed is taken out by the workpiece take-out robot 42 and conveyed to the correction / cutting device 44. Thereafter, as described above, trimming, predetermined heat treatment, and the like are performed.

  As described above, according to the casting mold 10 and the casting method according to the present embodiment, the heat of the gate forming mold 60c is obtained by moving the gate 62a along the extending direction of the gate by the cylinder 64 after pouring. The expansion and expansion of the molten metal during solidification are absorbed, and the thermal shock to the gate forming mold 60c is alleviated. Further, since the pouring direction of the pouring gate 62a is non-vertical, the molten metal to be poured does not fall freely at least, so the potential energy of the molten metal directly acts on the gate 62b and the product mold 52. It does not do so and the physical impact is alleviated.

  In the above embodiment, in step S8, the gate forming mold 60c is separated from the gate mold 61 to provide the gap G. However, the gate forming mold 60c is not necessarily separated from the gate mold 61. Alternatively, it may be finely moved in the direction of the arrow A1 so as not to receive a thermal shock while being in contact with the gate mold 61 (so as to absorb thermal expansion). In this case, since the shell 100 does not need to be formed in the molten metal, the second condition (the condition that the shell 100 is formed) need not be considered.

  Further, the movement of the gate forming mold 60c in the direction of the arrow A1 may be moved stepwise or continuously, not at once. In this case, for example, the internal pressure of the cylinder 64 may be moved stepwise or continuously so as to maintain the initial pressure P. As such means, a hydraulic circuit using a regulator, a relief valve or the like may be employed instead of using the controller 70.

  Further, the cylinder 64 may be moved stepwise or continuously so as to maintain the strain S at 0 (or a predetermined minute value) or in accordance with the displacement As of the side surface. The cylinder 64 may be moved stepwise or continuously according to a function (for example, a linear function) using the elapsed time T as a parameter.

  Furthermore, the object to be moved by the cylinder 64 is not limited to the gate forming mold 60c, and the entire design part mold 56 including the gate mold 61 may be moved. In this case, the gate mold 61 may be temporarily fixed to the gate forming mold 60c.

  Further, the distinction between the product mold 52 and the design part mold 56 is not limited to the above example, and for example, a gate mold 61 may be included in the product mold 52 as shown in FIG. That is, the object to be moved by the cylinder 64 only needs to include a portion of the design portion 62 that is assumed to be damaged by thermal shock unless it is moved, and may be appropriately set in each casting mold. .

  The means for moving the gate forming mold 60c is not limited to the cylinder 64, and various moving means such as a solenoid, a ball screw, and a gear mechanism can be applied. The threshold values Ps, Ss, As, Cs, and Ts can be obtained by calculation, simulation, experiment, and the like. Further, these threshold values do not have to be fixed values, and may be appropriately changed depending on the atmospheric temperature or the like.

  Of course, the casting mold and the casting method according to the present invention are not limited to the above-described embodiments, and various configurations can be adopted without departing from the gist of the present invention.

It is a block diagram which shows the whole casting system. It is a section side view of the casting metallic mold concerning this embodiment. It is a flowchart which shows the casting method which concerns on this Embodiment. It is a partial expanded sectional view of the casting mold in the state where the gate forming mold was moved by the cylinder. It is a cross-sectional side view of the casting metal mold | die which concerns on a modification.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Casting mold 12 ... Casting system 50 ... Cavity 52 ... Product mold 52a ... Lower mold 52b ... Upper mold 56 ... Plan part mold 60a ... Gate part lower mold 60b ... Gate part upper mold 60c ... Spout forming mold 61 ... Gate Mold 62 ... Plan part 62a ... Gate 62b ... Gate 64 ... Cylinder 70 ... Controller 72 ... Valve 74 ... Pressure sensor 76 ... Strain sensor 78 ... Displacement meter 80 ... Thermometer 100 ... Shell

Claims (6)

A first mold in which a gate is formed ;
A split mold in which a cavity communicating with the gate via the gate is formed in an initial state, and a mold opening direction is a direction perpendicular to the moving direction of the first mold ;
Moving means for moving the first mold along the extending direction of the gate;
Mold expansion detecting means for detecting or estimating the expansion of the first mold;
Control means for moving the first mold by the moving means when detecting or estimating that the first mold has expanded by the mold expansion detecting means,
The gate includes a depression that is inclined with respect to the axis of the cavity and communicates with the gate,
The moving means is configured to separate the first mold from the second mold and provide a gap with the second mold when detecting or estimating that the first mold has expanded. Characteristic casting mold. A first mold in which a gate is formed ;
A split mold in which a cavity communicating with the gate via the gate is formed in an initial state, and a mold opening direction is a direction perpendicular to the moving direction of the first mold ;
Moving means for moving the first mold along the extending direction of the gate;
When the molten metal poured from the gate is solidified, molten metal expansion detection means for detecting or estimating that the volume in the solidification temperature range has expanded,
Control means for moving the first mold by the moving means when detecting or estimating that the molten metal has expanded by the molten metal expansion detecting means,
The gate includes a depression that is inclined with respect to the axis of the cavity and communicates with the gate,
The moving means separates the first mold from the second mold when detecting or estimating that the molten metal has expanded, and provides a gap between the second mold and the second mold. Casting mold. A first mold in which a gate is formed ;
A split mold in which a cavity communicating with the gate via the gate is formed in an initial state, and a mold opening direction is a direction perpendicular to the moving direction of the first mold ;
Moving means for moving the first mold along the extending direction of the gate;
When the molten metal poured from the gate is solidified, solidification detection means for detecting or estimating that the surface has become a shell-shaped solidified layer;
Control means for moving the first mold by the moving means when detecting or estimating that the surface of the molten metal is solidified by the solidification detecting means,
The gate includes a depression that is inclined with respect to the axis of the cavity and communicates with the gate,
When the moving means detects or estimates that the surface of the molten metal has solidified, the moving means separates the first mold from the second mold and provides a gap with the second mold. Characteristic casting mold. The casting mold according to any one of claims 1 to 3,
The casting mold according to claim 1, wherein the cavity has an elongated shape, and an angle in a direction in which the gate and the cavity extend is in a range of up to 30 ° including the horizontal. A first mold in which a gate is formed ;
A split mold in which a cavity communicating with the gate via the gate is formed in an initial state, and a mold opening direction is a direction perpendicular to the moving direction of the first mold ; And
The gate includes a depression that is inclined with respect to the axis of the cavity and communicates with the gate,
A casting method performed using the first mold and the second mold,
When the molten metal poured from the gate is solidified, the step of detecting or estimating the volume expansion in the solidification temperature range by the molten metal expansion detection means,
When the molten metal expansion detecting means detects or estimates that the molten metal has expanded in volume, the first mold is moved by moving means along the extending direction of the gate, and the second mold Providing a gap between them,
A casting method characterized by comprising: A first mold in which a gate is formed ;
A split mold in which a cavity communicating with the gate via the gate is formed in an initial state, and a mold opening direction is a direction perpendicular to the moving direction of the first mold ; And
The gate includes a depression that is inclined with respect to the axis of the cavity and communicates with the gate,
A casting method performed using the first mold and the second mold,
A step of detecting or estimating by a solidification detecting means that the surface layer has become a shell-shaped solidified layer when the molten metal poured from the gate is solidified;
When the solidification detecting means detects or estimates that the surface layer of the molten metal has solidified, the first mold is moved by the moving means along the extending direction of the gate, and the second mold is moved. A second step of providing a gap between,
A casting method characterized by comprising:

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