JP5657717B2 - Mold for casting - Google Patents

Description

  The present invention relates to a casting mold including a mold body that slidably supports a sliding mold.

  Conventionally, in order to make it easy to release a cast product from a mold, a mold release agent is widely applied to a cavity surface of the mold before casting. Generally, the release agent is applied to the cavity surface in a state dissolved in moisture. Then, moisture evaporates due to the residual heat of the mold, and the release agent adheres to the cavity surface in a film form.

  However, when the mold is at a relatively low temperature or the amount of the release agent applied to the cavity surface is excessive, the moisture may remain in the cavity without being completely evaporated. Casting in this state may cause a so-called poor water residue.

  For example, in Patent Document 1, a slide core is slidably disposed in a fixed guide groove, and an opening of a discharge hole for discharging a release agent is formed on a wall surface constituting the guide groove. A technical idea is disclosed in which compressed air is blown onto the cavity surface of the slide core to which the release agent is applied, thereby collecting excess release agent on the cavity surface below the guide groove and introducing it into the discharge hole. ing.

JP 2011-194433 A

  In the conventional technique such as Patent Document 1 described above, since the groove bottom surface of the guide groove extends in a direction substantially orthogonal to the cavity surface of the slide core (sliding type), the compression sprayed on the cavity surface is performed. Air (compressed fluid) is easy to hit perpendicularly to the bottom surface of the groove. Therefore, the release agent blown off by the compressed air may hit the groove bottom surface and bounce off the cavity surface of the slide core. Further, the release agent collected under the guide groove may be blown against the compressed air, hit the bottom surface of the groove, and bounce back to the cavity surface of the slide core. If it does so, there is a concern of causing poor water residue.

  The present invention has been made in view of such a problem, and an excessive release agent applied to the sliding cavity surface can be efficiently discharged to the outside of the cavity. An object of the present invention is to provide a casting mold capable of suppressing the occurrence of poor water residue.

[1] A casting mold according to the present invention is a casting mold provided with a mold body that slidably supports a sliding mold, wherein the sliding mold slides. the sliding surface, discharge groove for discharging the release agent applied to the cavity surface of the sliding type is formed, on the wall surface constituting the discharge groove, towards the groove bottom surface of the front Symbol discharge groove An inclined surface that is inclined with respect to a direction orthogonal to the groove bottom surface, and at least a part of the inclined surface is in the sliding-type retracted state when viewed from the direction orthogonal to the groove bottom surface. It is characterized by being located above .

According to the casting die according to the present invention, at least a portion of the inclined surface formed on the wall surface constituting the discharge groove formed on the sliding surface of the mold body, the discharge groove in a retracted state of the sliding type When the compressed fluid is sprayed on the cavity surface of the sliding mold coated with the release agent, the cavity surface is excessive. A release agent can be applied to the inclined surface. Further, since the inclined surface is inclined with respect to the direction perpendicular to the groove bottom surface toward the groove bottom surface of the discharge groove, the release agent hitting the inclined surface does not bounce back to the cavity surface. It will get in. Thereby, the excessive mold release agent applied to the cavity surface of the sliding mold can be efficiently discharged to the outside of the cavity. Therefore, generation | occurrence | production of the water residue defect can be suppressed.

[2] In the casting mold described above, the sliding mold is supported by the mold main body so as to be slidable along the vertical direction so as to be retracted vertically downward, and the inclined surface is formed by the discharge You may form in the upper groove side surface which comprises a groove | channel.

  According to such a configuration, since the inclined surface is formed on the side surface of the upper groove constituting the discharge groove, the turbulent flow of the compressed fluid can be suppressed. Further, the release agent that has hit the inclined surface can be dropped vertically downward and collected in the lower part of the discharge groove.

[3] In the casting mold, a guide groove for guiding the sliding mold along a vertical direction is formed on the sliding surface of the mold body, and the separation groove in the discharge groove is formed. You may provide the derivation | leading-out part which guides a type | mold agent to the said guide groove.

  According to such a configuration, since the lead-out portion that guides the release agent in the discharge groove to the guide groove is provided, the release agent in the discharge groove flows out of the mold body through the guide groove. Can do. Thereby, it is possible to prevent a large amount of the release agent from accumulating in the discharge groove. Further, by using the guide groove, it is not necessary to newly provide a mechanism for discharging the release agent in the discharge groove to the outside of the mold body, so that the structure of the casting mold can be simplified. it can.

[4] In the casting mold described above, the lead-out portion is formed on a lower groove side surface constituting the discharge groove, is continuous with the groove side surface of the guide groove, and is inclined vertically downward toward the guide groove. You may do it.

  According to such a configuration, since the lead-out portion is formed on the lower groove side surface constituting the discharge groove, the release agent that has hit the inclined surface and dropped vertically downward can be reliably received by the lead-out portion. Further, since the lead-out portion is inclined vertically downward toward the guide groove, the release agent received by the lead-out portion can flow in one direction toward the guide groove, and the release agent is aggregated. It can be made easy to flow. Furthermore, since the lead-out portion is continuous with the groove side surface of the guide groove, the release agent that has flowed to the lower portion of the lead-out portion can flow into the guide groove along the groove side surface of the guide groove. Thereby, the mold release agent in the discharge groove can be reliably guided to the guide groove.

[5] In the casting mold described above, the sliding die has a guide portion that is slidably disposed in the guide groove, and the guide portion is in a closed state of the sliding die. You may protrude vertically upwards from the lower end of the said derivation | leading-out part.

  According to such a configuration, the guide part protrudes vertically above the lower end of the lead-out part in the sliding mold closed state, so that the release agent remaining in the discharge groove flows into the guide groove. This can be blocked by the guide part and stored in the lower part of the lead-out part. Thereby, when the sliding mold is slid vertically downward by the mold opening, it is possible to surely flow the release agent accumulated in the lower portion of the lead-out portion into the guide groove.

  According to the casting mold according to the present invention, the inclined surface exposed to the side where the cavity surface is located in the retracted state of the sliding mold is formed on the wall surface constituting the discharge groove formed on the sliding surface of the mold body. Since it is formed, the excess release agent applied to the sliding cavity surface can be efficiently discharged to the outside of the cavity, thereby suppressing the occurrence of poor water residue.

1 is a partially omitted cross-sectional view of a casting mold according to an embodiment of the present invention. FIG. 2 is a partially omitted sectional view taken along line II-II in FIG. 1. It is a cross-sectional perspective view for demonstrating the discharge groove and guide groove which were formed in the movable mold | type which comprises the said metal mold | die for casting. FIG. 5 is a partially omitted enlarged cross-sectional view showing a state in which compressed air is sprayed on a cavity surface of a sliding mold constituting the casting mold. FIG. 3 is a partially omitted enlarged front view of a state in which compressed air is blown onto the cavity surface as viewed from a fixed mold. FIG. 3 is a partially omitted cross-sectional view showing a closed state of the casting mold. FIG. 7 is a partially omitted cross-sectional view taken along line VII-VII in FIG. 6. FIG. 6 is a partially omitted cross-sectional view illustrating a state where a release agent remaining in the discharge groove is discharged.

  Hereinafter, preferred embodiments of the casting mold according to the present invention will be described in detail with reference to the accompanying drawings.

  As shown in FIGS. 1 and 2, a casting mold 10 according to an embodiment of the present invention is a mold for casting a cylinder block, and can be moved close to and away from the fixed mold 12. A movable mold (die body) 14 that is opposed to the movable mold 14 and a plurality of (two in this embodiment) sliding molds 16 and 18 that are slidably supported with respect to the movable mold 14. Yes. In the casting mold 10, when the mold is closed (clamped), the fixed mold 12, the movable mold 14, and the plurality of sliding molds 16 and 18 form a cavity C having a shape corresponding to the cylinder block that is a cast product. It will be formed (see FIG. 6).

  The fixed mold 12 is connected to the end portion of the emission sleeve 20 constituting the gate, and a runner 22 for guiding a molten metal such as aluminum supplied from the emission sleeve 20 to the cavity C is formed. Has been. Further, a crank chamber forming portion 26 bulging toward the movable die 14 is provided on the cavity surface 24 (surface forming the cavity C) of the fixed die 12.

  A guide groove 28 extending along the vertical direction and a discharge groove 30 for discharging the release agent P are formed on the sliding surface of the slide mold 16 in the movable mold 14. The guide groove 28 is for guiding the sliding die 16 along the vertical direction, and is formed in a rectangular shape when viewed from the front. A specific configuration of the discharge groove 30 will be described later.

  The cavity surface 32 of the movable mold 14 is disposed so as to surround a plurality (four in this embodiment) of cylindrical cylinder bore forming portions 34 projecting toward the fixed die 12 and the plurality of cylinder bore forming portions 34. A water jacket forming portion 36 is provided. The plurality of cylinder bore forming portions 34 are arranged in a line in a direction (left-right direction in FIG. 2) orthogonal to both the moving direction of the movable mold 14 and the sliding direction of the sliding mold 16.

  The sliding mold 16 is supported by the movable mold 14 so as to be slidable in the vertical direction so as to be retracted vertically downward, and a sliding mold main body 38 disposed vertically below the sliding mold 18; And a guide portion 40 that protrudes from the sliding die main body 38 and is slidably disposed in the guide groove 28 of the movable die 14. The cavity surface 42 formed on the upper surface of the sliding mold body 38 includes a cylinder wall forming surface 44 and a crankcase wall forming surface 46.

  As can be seen from FIG. 2, the cylinder wall forming surface 44 has a recess 48 formed substantially at the center and a pair of peaks 50 connected to both sides of the recess 48 in a front view as viewed from the fixed mold 12 side. , 52 and a pair of valleys 54, 56 that are connected to the peaks 50, 52 and located at both ends of the sliding type main body 38. That is, the cylinder wall forming surface 44 has a height difference in the width direction (the arrangement direction of the plurality of cylinder bore forming portions 34).

  The protruding length of the guide portion 40 is set to be shorter than the groove depth of the guide groove 28. That is, a predetermined gap S is formed between the guide portion 40 and the groove bottom surface 57 of the guide groove 28 (see FIG. 4). The upper end surface 58 of the guide portion 40 is inclined vertically downward toward the groove bottom surface 57 of the guide groove 28.

  The sliding mold 18 is positioned vertically above the sliding mold 16 and is supported by the movable mold 14 so as to be slidable along the vertical direction so as to retreat vertically. The cavity surface 60 of the sliding mold 18 has a shape corresponding to the side wall surface of the cylinder block.

  The discharge groove 30 formed in the movable mold 14 is for discharging excess release agent P applied to the cavity surface 42 of the sliding mold 16 to the outside of the cavity C, and from the fixed mold 12 side. , The upper portion of the discharge groove 30 is formed in a rectangular shape extending along the direction in which the plurality of cylinder bore forming portions 34 are arranged, and the lower portion of the discharge groove 30 is shaped like a downward triangle. Is formed.

  On the upper groove side surface constituting the discharge groove 30, an inclined surface 64 that is continuously inclined vertically downward toward the groove bottom surface 62 is formed. As can be understood from FIGS. 2 and 5, the inclined surface 64 is located in the cavity surface 42 of the sliding die 16 in the retracted state of the sliding die 16 (the sliding die 16 is positioned at the lowest vertical position). Exposed to the side. In FIG. 5, the exposed portion of the inclined surface 64 is indicated by cross hatching. The length dimension of the inclined surface 64 is set to be approximately the same as the width dimension of the sliding mold 16.

  The inclination angle θ of the inclined surface 64 (see FIG. 4), that is, the angle formed between the inclined surface 64 and a line parallel to the cavity surface 42 of the sliding die 16 (perpendicular to the groove bottom surface 62 of the discharge groove 30) is arbitrarily set. Although it can be set, for example, it is preferably set to 45 °. When the inclination angle θ is set to 45 °, the release agent P blown off from the cavity surface 42 of the sliding die 16 to the movable die 14 side by the compressed air and hits the inclined surface 64 without rebounding to the cavity surface 42. This is because it can be dropped vertically downward.

  An upper end portion of the guide groove 28 is formed on the groove bottom surface 62 of the discharge groove 30. In other words, the guide groove 28 extends from a position vertically below the discharge groove 30 to a position along the discharge groove 30. Further, the guide groove 28 is positioned substantially in the center of the discharge groove 30 in the width direction.

  A pair of lead-out portions 66 and 68 for guiding the release agent P falling on the inclined surface 64 to the guide groove 28 is formed on the lower groove side surface constituting the discharge groove 30. Each lead-out portion 66, 68 is continuously inclined vertically downward from both ends of the discharge groove 30 toward the guide groove 28, and is connected to each groove side surface 70, 72 of the guide groove 28 at the lower end (see FIG. 2 and FIG. 3). Each lead-out portion 66, 68 is located vertically below the inclined surface 64.

  The casting mold 10 according to the present embodiment is basically configured as described above. Next, the operation and effect will be described.

  When casting a cylinder block using the casting mold 10, first, a mold release agent P dissolved in water is applied to each of the cavity surfaces 24, 32, 42, 60 in the mold open state. Then, moisture is evaporated by the residual heat of the casting mold 10 and the release agent P adheres to the cavity surfaces 24, 32, 42, 60 in a film form. However, when the casting mold 10 is at a relatively low temperature, or when the amount of the release agent P applied to each cavity surface 24, 32, 42, 60 is excessive, the water is completely evaporated. And may remain in the cavity C. In particular, excessive release agent P (moisture) tends to remain on the cavity surface 42 of the sliding mold 16 oriented vertically upward.

  In the present embodiment, excess release agent P applied to the cavity surface 42 of the sliding mold 16 is collected in the recess 48 and the valleys 54 and 56 of the cavity surface 42. At this time, the inclined surface 64 of the discharge groove 30 is exposed to the cavity surface 42 side at locations corresponding to the recessed portion 48 and the valley portions 54 and 56 (see the exposed portion shown by cross-hatching in FIG. 5). .

  Subsequently, as shown in FIG. 4, a spray cassette (fluid ejecting means) 100 is disposed at the height position of the cavity surface 42 of the sliding mold 16 on the fixed mold 12 side, and the spray cassette 100 is moved to the movable mold 14. Compressed air (compressed fluid) is jetted out. Then, compressed air is blown onto the cavity surface 42, and excess release agent P collected in the recess 48 and the valleys 54 and 56 is blown off toward the inclined surface 64.

  As can be understood from FIG. 5, the release agent P blown off from the valleys 54 and 56 and hits the inclined surface 64 falls to the outlets 66 and 68 without being bounced back to the cavity surface 42. On the other hand, the release agent P blown off from the recess 48 and hits the inclined surface 64 falls to the upper end surface 58 of the guide portion 40 without being bounced back to the cavity surface 42.

  The release agent P that has fallen on the lead-out portions 66 and 68 flows downward toward the guide groove 28 while aggregating, and reaches the upper end surface 58 of the guide portion 40 along the groove side surfaces 70 and 72 of the guide groove 28. Then, on the upper end surface 58 of the guide portion 40, the release agent P dropped from the inclined surface 64 and the release agent P guided from the respective lead-out portions 66 and 68 are further aggregated on the groove bottom surface 57 of the guide groove 28. The release agent P that has flowed downward and agglomerated is discharged outside the movable mold 14 through the gap S between the groove bottom surface 57 and the guide portion 40. Note that the release agent P discharged to the outside of the movable mold 14 may be recovered and reused. Thereby, the excess mold release agent P applied to the cavity surface 42 of the sliding mold 16 can be efficiently eliminated.

  Subsequently, as shown in FIG. 6, the movable die 14 is brought close to the fixed die 12 side while the sliding die 16 is slid vertically upward and the sliding die 18 is slid vertically downward. The mold 10 is closed. Thereby, the cavity C is formed by the cavity surfaces 24, 32, 42, 60. Thereafter, a molten aluminum is supplied from the emission sleeve 20. Then, the melt is filled into the cavity C through the runner 22.

  On the other hand, as shown in FIG. 7, the guide portion 40 protrudes vertically upward from the lower ends of the lead-out portions 66 and 68 when the sliding die 16 is closed. If it does so, the mold release agent P which still remained in the discharge groove 30 will flow through each derivation | leading-out parts 66 and 68, and will be collected in the lower part. That is, since the intrusion of the release agent P into the guide groove 28 is blocked by the guide portion 40 at the lower portion of each of the lead-out portions 66 and 68, the release agent P accumulates at the lower portion of each of the lead-out portions 66 and 68.

  Thereafter, after the molten metal filled in the cavity C is solidified, the movable die 14 is separated from the fixed die 12, the sliding die 16 is retracted vertically downward, and the sliding die 18 is retracted vertically upward, thereby casting the cast product. Is removed from the casting mold 10. The cylinder block is formed by casting in a state where moisture on the cavity surface 42 of the sliding mold 16 is efficiently removed, and thus does not have a so-called water residue defect.

  Further, when the sliding die 16 is retracted vertically downward by this mold opening, the upper end of the guide portion 40 is positioned vertically lower than the lower ends of the derivation portions 66 and 68, so The stored release agent P flows into the upper end surface 58 of the guide portion 40 (see FIG. 8). Then, the release agent P in a state of being agglomerated to some extent is discharged from the upper end surface 58 of the guide portion 40 to the outside of the movable die 14 through the gap S between the groove bottom surface 57 of the guide groove 28 and the guide portion 40. It becomes.

  As described above, according to the casting mold 10, the cavity surface 42 is positioned in the retracted state of the sliding mold 16 on the wall surface constituting the discharge groove 30 formed on the sliding surface of the movable mold 14. Since the inclined surface 64 exposed to the side is formed, when the compressed air is blown onto the cavity surface 42 of the sliding mold 16 to which the release agent P is applied, the excess release agent P on the cavity surface 42 is removed. It can be applied to the inclined surface 64.

  Further, since the inclined surface 64 is inclined toward the groove bottom surface 62 of the discharge groove 30, the release agent P that has hit the inclined surface 64 enters the discharge groove 30 without rebounding to the cavity surface 42. Become. Thereby, the excess mold release agent P applied to the cavity surface 42 of the sliding mold 16 can be efficiently discharged to the outside of the cavity C. Therefore, generation | occurrence | production of the water residue defect can be suppressed.

  In the case of this embodiment, since the inclined surface 64 is formed on the upper groove side surface constituting the discharge groove 30, turbulent flow of compressed air can be suppressed. Further, the release agent P that has hit the inclined surface 64 can be dropped vertically downward and collected in the lower portion of the discharge groove 30.

  In the case of the present embodiment, since the pair of lead-out portions 66 and 68 are formed on the side surface of the lower groove constituting the discharge groove 30, the release agent P that has fallen vertically downward by hitting the inclined surface 64 is provided in each lead-out portion 66. , 68.

  In addition, since each lead-out portion 66, 68 is inclined vertically downward toward the guide groove 28, the release agent P received by each lead-out portion 66, 68 can flow in one direction toward the guide groove 28. The release agent P can be agglomerated to facilitate flow.

  Further, since the respective lead-out portions 66 and 68 are continuous with the respective groove side surfaces 70 and 72 of the guide groove 28, the release agent P that has flowed to the lower portion of each lead-out portion 66 and 68 is provided on the groove side surfaces 70 and 72 of the guide groove 28. And can flow into the guide groove 28. Thereby, the mold release agent P in the discharge groove 30 can be reliably guided to the guide groove 28. That is, it is possible to prevent a large amount of release agent P from accumulating in the discharge groove 30.

  In the case of the present embodiment, the release agent P that has flowed into the guide groove 28 is discharged to the outside of the movable mold 14 through the gap S between the groove bottom surface 57 of the guide groove 28 and the guide portion 40 of the sliding mold 16. Is done. That is, by using the guide groove 28, it is not necessary to newly provide a mechanism for discharging the release agent P in the discharge groove 30 to the outside of the movable mold 14, so that the configuration of the casting mold 10 is simplified. Can be

  In the case of this embodiment, the guide part 40 protrudes vertically upward from the lower ends of the lead-out parts 66 and 68 when the sliding mold 16 is closed, so that the release agent P remaining in the discharge groove 30 is present. Inflow into the guide groove 28 can be blocked by the guide portion 40 and stored in the lower portions of the lead-out portions 66 and 68. Thereby, when the sliding mold 16 is slid vertically downward by opening the mold, the release agent P accumulated in the lower portions of the lead-out portions 66 and 68 can surely flow into the guide groove 28.

  The present invention is not limited to the above-described embodiment, and it is naturally possible to adopt various configurations without departing from the gist of the present invention.

  The casting mold according to the present invention is not limited to the one for casting the cylinder block, and may be a mold for casting a cast product having an arbitrary shape. Further, the inclined surface of the discharge groove is not limited to the example formed on the upper groove wall surface constituting the discharge groove. In short, the inclined surface should just be formed in the part which is exposed to the side in which the cavity surface is located in the sliding-type retracted state among the wall surfaces constituting the discharge groove.

  The lead-out part is not limited to the example formed on the lower groove side surface constituting the discharge groove. That is, for example, the discharge groove and the guide groove are formed separately on the sliding surface of the mold body on which the sliding mold slides, and a groove or a hole connecting the discharge groove and the guide groove is provided as a lead-out portion. It does not matter.

10 ... Mold for casting 14 ... Movable mold (mold body)
16, 18 ... Sliding mold 24, 32, 42, 60 ... Cavity surface 28 ... Guide groove 30 ... Discharge groove 40 ... Guide portion 64 ... Inclined surface 66, 68 ... Lead-out portion

Claims (5)

A casting mold having a mold body that slidably supports a sliding mold,
A discharge groove for discharging the release agent applied to the cavity surface of the sliding mold is formed on the sliding surface of the mold body on which the sliding mold slides,
Wherein a wall surface constituting the discharge groove is an inclined surface which is inclined with respect to a direction orthogonal to the groove bottom surface toward the groove bottom surface of the front Symbol discharge groove is formed,
A casting mold , wherein at least a part of the inclined surface is positioned above the cavity surface in a retracted state of the sliding mold as viewed from a direction orthogonal to the groove bottom surface . The casting mold according to claim 1, wherein
The sliding mold is supported by the mold body so as to be slidable along the vertical direction so as to be retracted vertically downward;
The inclined surface is formed on the upper groove side surface constituting the discharge groove,
A casting mold characterized by that. The casting mold according to claim 2, wherein
A guide groove for guiding the sliding mold along the vertical direction is formed on the sliding surface of the mold body,
A lead-out portion for guiding the release agent in the discharge groove to the guide groove;
A casting mold characterized by that. The casting mold according to claim 3,
The lead-out portion is formed on the lower groove side surface constituting the discharge groove, is continuous with the groove side surface of the guide groove, and is inclined vertically downward toward the guide groove.
A casting mold characterized by that. The casting mold according to claim 4, wherein
The sliding mold has a guide portion slidably disposed in the guide groove,
The guide portion protrudes vertically upward from the lower end of the lead-out portion in the sliding-type mold closed state.
A casting mold characterized by that.

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