JP2012196699A - Tilting gravity casting apparatus and tilting gravity casting method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tilting gravity casting apparatus and a tilting gravity casting method using the apparatus.SOLUTION: In the tilting gravity casting apparatus 1, a die 2 includes a ladle 7, and a molten metal M is reserved in the ladle 7, wherein the molten metal M is poured into a cavity 6 of the die 2 through an ingate 5 when the die 2 is inclined. The tilting gravity casting apparatus 1 includes: a barrier member 18 to intercept the ingate 5; and a pressurizing pin 23 to pressurize the molten metal M of the cavity 6. The ingate 5 has a recessed part 5A that enlarges the passage area only by the predetermined range, and is configured such that the barrier member 18 invades the recessed part 5A, and the ingate 5 is intercepted.

Description

  The present invention relates to a tilt type gravity casting apparatus and a tilt type gravity casting method using the apparatus.

  A tilting gravity casting apparatus that includes a hopper (laddle) in a mold, stores molten metal in the hopper, and pours molten metal into a mold cavity through a gate when the mold is tilted is described in Patent Document 1 below. As is known. And patent document 1 is disclosing the tilt type gravity casting method which performs the gas pressurization process which pressurizes the molten metal in a cavity by sending high pressure gas with a gas supply means in the middle or after completion | finish of a pouring process.

  However, depending on the method of pressurizing the molten metal in such a gas pressurizing step, it is sufficient that the molten metal cannot be filled up to the end of the cavity of the mold, or that casting defects such as a sinkhole occur in the cast product. May not be able to prevent.

Japanese Patent No. 4203093

  Therefore, the present invention has been made in view of the above-mentioned conventional problems, and is a tilting gravity casting apparatus that is excellent in molten metal filling properties and can sufficiently prevent casting defects from occurring in a cast product, and a casting method using the apparatus. It is an issue to provide.

  The present invention has been made to solve the above-mentioned problems, and the tilt type gravity casting apparatus according to the present invention comprises a mold 2 provided with a ladle 7, the molten metal M is stored in the ladle 7, and the mold 2 is In the tilting gravity casting apparatus 1 that pours the molten metal M into the cavity 6 of the mold 2 through the gate 5 when tilted, a blocking member 18 for blocking the gate 5 and the molten metal M in the cavity 6 are provided. And a pressurizing pin 23 for pressurizing, and the gate 5 has a recess 5A that enlarges the passage area only by a predetermined range, and the blocking member 18 enters the recess 5A to block the gate 5. Tilt-type gravity casting apparatus characterized by that.

  Moreover, the tilt type gravity casting method according to the present invention is characterized by casting using the tilt type gravity casting apparatus 1.

  According to the tilt type gravity casting apparatus and the casting method of the present invention, it becomes easy to adjust the timing for shutting off the gate, and the molten metal can be filled up to the end of the cavity of the mold by pressurizing the pressure pin. It is possible to sufficiently prevent casting defects from occurring in the cast product.

It is sectional drawing of the tilting type gravity casting apparatus of this embodiment. It is a perspective view of a blocking member. It is a figure explaining the state which inclined the metal mold | die from FIG. 1 and interrupted the gate with the interruption | blocking member. It is a figure explaining the state which inclines a metal mold | die further from FIG. 3, and pressurizes molten metal with a pressurization pin. It is a figure explaining the state which the metal mold tilting process was completed.

  The tilting gravity casting method according to an embodiment of the present invention will be described with reference to the drawings. First, the tilting gravity casting apparatus 1 that performs the tilting gravity casting method according to the present embodiment will be described. As shown in FIG. 1, the tilt type gravity casting apparatus 1 includes a mold 2 composed of a lower fixed mold 3 and an upper movable mold 4. A gate 5 and a cavity 6 are defined. In the present embodiment, the gate 5 and the cavity 6 are defined by the groove formed on the fixed mold dividing surface 3A and the movable mold dividing surface 4A. A ladle 7 is fixed to the fixed mold 3, and a molten metal M such as an aluminum alloy is stored in the ladle 7.

  The fixed mold 3 is fixed to the upper surface 8 a of the base 8. The lower end of the guide shaft 9 is fixed to the base 8, and the upper end of the guide shaft 9 is fixed to the top plate 10. A hydraulic cylinder 11 is fixed to the upper surface 10 a of the top plate 10, and the tip of a cylinder rod 12 that penetrates the top plate 10 is connected to a movable plate 13 disposed below the top plate 10. When the hydraulic cylinder 11 is driven, the movable plate 13 is guided by the guide shaft 9 and can move between the base 8 and the top plate 10 in the vertical direction in FIG. A connecting shaft 14 is provided below the movable plate 13, and the movable plate 13 and the movable mold 4 are connected by the connecting shaft 14. Accordingly, the movable mold 4 can move in the vertical direction in FIG. 1 between the base 8 and the top plate 10 together with the movable plate 13.

  The tilt type gravity casting apparatus 1 includes a tilt mechanism (not shown). The tilting mechanism is a known mechanism as disclosed in the above-mentioned Patent Document 1, and is provided on the base 8 and extends in a direction connecting the front and back of the paper surface of FIG. A support arm (not shown) and tilting drive means attached to the support arm are provided. By the tilting mechanism, the base 8 and the mold 2 can be tilted by approximately 90 degrees at a predetermined speed in the direction of the arrow α from the horizontal state shown in FIG.

  A hydraulic cylinder 15 is fixed to the upper surface 4 a of the movable mold 4. A cylinder rod 16 of the hydraulic cylinder 15 is connected to a blocking member 18 by a coupling 17 in a hole 4 b formed in the movable mold 4. As shown in FIG. 2, the blocking member 18 includes a columnar head portion 18 a accommodated in the coupling 17 and a quadrangular columnar shaft portion 18 b. When the hydraulic cylinder 15 is driven, the tip of the shaft portion 18 b is configured to enter the gate 5.

  The gate 5 serving as a passage for the molten metal M has a quadrangular cross section cut in the direction connecting the front and back of the paper surface of FIG. 1, and is formed by a groove formed on the fixed mold dividing surface 3A and the movable mold dividing surface 4A. It is defined so as to extend in the left-right direction in FIG. The gate 5 is provided with a recess 5 </ b> A that increases the passage area only in a predetermined range at a position facing the blocking member 18 in the fixed mold 3. The concave portion 5A extends in the vertical direction of FIG. 1 and is formed in a shape corresponding to the tip shape of the shaft portion 18b of the blocking member 18. The gate 5 is blocked by the shaft portion 18b of the blocking member 18 entering the recess 5A.

  A hydraulic cylinder 20 is fixed to the lower surface 8 b of the base 8 by a support bar 19. A cylinder rod 21 of the hydraulic cylinder 20 is connected to a pressure pin 23 via a coupling 22. The pressure pin 23 passes through the base 8 and is disposed in a hole 3 a formed in the fixed mold 3. When the hydraulic cylinder 20 is driven, the tip of the pressurizing pin 23 enters the cavity 6 and pressurizes the molten metal M in the cavity 6.

  The mold 2 is provided with an unillustrated extruding pin. After the movable mold 4 is separated from the fixed mold 3, the molten metal M solidified in the pouring gate 5 and the cavity 6 is extruded from the mold 2 with the extruding pin. It can be taken out.

  Next, the tilt type gravity casting method using the tilt type gravity casting apparatus 1 will be described. In the tilt type gravity casting method, first, a molten metal preparation step for storing the molten metal M in the ladle 7 is performed to obtain the state shown in FIG.

  Next, a mold tilting process is started in which the mold 2 is tilted approximately 90 ° in the direction shown by the arrow α from the state shown in FIG. 1 and the molten metal M in the ladle 7 is poured into the cavity 6 through the gate 5. The mold 2 is tilted at a predetermined speed by a tilt mechanism (not shown).

  The pressurizing process is started before the mold tilting process is completed. As shown in FIG. 3, when the mold 2 is tilted by 45 ° or more, all the molten metal M in the ladle 7 is moved into the gate 5 and the cavity 6. Is inserted into the recess 5A of the gate 5 and the tip of the blocking member 18 is brought into contact with the bottom surface of the recess 5A to block the gate 5. In addition, since the molten metal M in the portion where the passage area of the gate 5 is increased by the recess 5A is difficult to solidify, it is easy to adjust the timing at which the gate 5 is blocked by allowing the blocking member 18 to enter the gate 5. Moreover, since the passage area of the gate 5 is increased only in the concave portion 5A, the yield of the material can be increased. Then, as shown in FIG. 4, the hydraulic cylinder 20 is driven to cause the tip of the pressure pin 23 to enter the cavity 6 to pressurize the molten metal M in the cavity 6. In this way, by starting the pressurizing process of pressurizing the molten metal in the cavity 6 with the pressurizing pin 23 in a state in which the gate 5 is shut off at a predetermined timing until the mold tilting process is completed, the mold 2 is separated from the mold 2 by solidification shrinkage. A surface layer such as an end of the cavity 6 to be separated can be pressed against the mold 2. Moreover, the molten metal M for solidification shrinkage can be replenished under pressure, and it is possible to sufficiently prevent a casting defect such as a sinkhole from occurring in the cast product C (see FIG. 5). The tilting is continued after the pressurizing step is completed, and the tilting is stopped when the state shown in FIG. 5 tilted by approximately 90 ° from the state of FIG. 1 is completed, and the mold tilting step is completed.

  Next, a mold opening process is performed. In the mold opening process, the hydraulic cylinder 11 is driven, the movable mold 4 is moved together with the movable plate 13 in the right direction in FIG. 5, and the movable mold 4 is separated from the fixed mold 3. Then, a casting product unloading step of extruding the molten metal M solidified in the gate 5 and the cavity 6 by an unillustrated extrusion pin provided in the mold 2 to take out the cast product C from the mold 2, A mold release agent application step for applying a mold release agent, a hydraulic cylinder 11 is driven, the movable plate 4 is moved together with the movable plate 13 to the left in FIG. Steps are sequentially performed. Finally, the mold 2 is returned to the state shown in FIG. 1 by the tilting mechanism. The above is the tilt type gravity casting method.

  The tilt type gravity casting apparatus and the tilt type gravity casting method according to the present invention are not limited to the above-described embodiments, and various modifications and improvements can be made within the scope described in the claims. For example, in the above-described embodiment, the tip of the blocking member 18 enters the recess 5A of the gate 5 and comes into contact with the bottom surface of the recess 5A, but it does not necessarily have to contact the bottom surface.

  In the above-described embodiment, the pressurization process is performed before the mold tilting process is completed. However, the pressurization process may be performed after the mold tilting process is completed. The pressurizing process may be continued even after the mold tilting process is completed.

  In the above-described embodiment, the recess 5A of the gate 5 is formed in the fixed mold 3 and the blocking member 18 is disposed on the movable mold 4 side. However, the recess 5A is formed in the movable mold 4 and the blocking member 18 is formed. May be arranged on the fixed mold 3 side.

  Moreover, in the above-mentioned embodiment, although the pressurization pin 23 was arrange | positioned at the fixed mold | type 3 side, you may arrange | position at the movable mold | type 4 side.

DESCRIPTION OF SYMBOLS 1 Tilt-type gravity casting apparatus 2 Metal mold | die 3 Fixed mold | type 3A Fixed mold | die division surface 4 Movable type 4A Movable type | mold division | segmentation surface 4a Upper surface 4b Hole part 5 Cup 5A Recessed part 6 Cavity 7 Raddle 8 Base 8a Upper surface 8b Lower surface 9 Guide shaft 10 Top plate DESCRIPTION OF SYMBOLS 10a Upper surface 11 Hydraulic cylinder 12 Cylinder rod 13 Movable plate 14 Connecting shaft 15 Hydraulic cylinder 16 Cylinder rod 17 Coupling 18 Shut-off member 18a Head 18b Shaft portion 19 Support rod 20 Hydraulic cylinder 21 Cylinder rod 22 Coupling 23 Pressure pin M Molten metal C Casting product

Claims (2)

  In a tilting gravity casting apparatus that includes a ladle in a mold, stores molten metal in the ladle, and pours molten metal into the cavity of the mold through the pouring gate when the mold is tilted, for blocking the pouring gate A shut-off member and a pressurizing pin for pressurizing the molten metal in the cavity; the pouring gate has a recess that enlarges the passage area by a predetermined range; the shut-off member enters the recess and the pouring gate shuts off. Tilt-type gravity casting apparatus characterized by being made.   A tilting gravity casting method, wherein the casting is performed using the tilting gravity casting apparatus according to claim 1.

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