JPH042343B2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention provides a method for forming a core at the open end of a centrifugal casting mold.
Regarding the core setter of a centrifugal casting machine for installing.

BACKGROUND ART A conventional core setter of a centrifugal casting machine has a structure as shown in, for example, Japanese Patent Application No. 135760/1982.

The construction will be explained with reference to FIG. 3. Reference numeral 1 denotes a horizontal centrifugal casting mold, which is capable of casting a cast iron pipe 2. Reference numeral 3 designates a front cover that holds the core 4, and is attached to a rotating body 5 that can move toward and away from the casting mold 1 in the axial direction. A plurality of engaging members 6 are provided in the circumferential direction around the periphery of the open end of the casting mold 1. Each engaging member 6 is swingable around a pin 7, and is integrally formed with a centrifugal weight 8 that opens and opens as the mold 1 rotates. A torsion coil spring 9 is fitted around the pin 7 and urges the centrifugal weight 8 to open. An engagement ring 10 is attached to the rotating body 5.
are provided, and each engagement member 6 has an engagement ring 10
An engaging protrusion 11 that can be engaged with the pin 7 is integrally formed inside the pin 7.

According to such a configuration, the engagement protrusion 11 pushes the engagement ring 10 by the force of the spring 9, and the front cover 3, that is, the core 4 is temporarily fixed to the casting mold 1. Mold 1
When rotates, the centrifugal force acting on the weight 8 causes the engagement protrusion 11 to push the engagement ring 10 toward the mold 1, and this pushing force presses the front cover 3 against the mold 1, causing thrust by the molten metal. You will receive power.

Problems to be Solved by the Invention However, in the conventional device described above, since the engaging member 6 is attached to the casting mold 1, there is a problem in that maintenance and inspection are time-consuming.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to enable easy maintenance and inspection of an engaging member for pressing a front cover against a casting mold.

Means for Solving the Problems In order to achieve the above object, the present invention provides a first annular groove and a second annular groove spaced apart from each other in the axial direction on the inner surface of the open end of a centrifugal casting mold. a front lid which is formed by holding a core and is approached to the open end of the centrifugal casting mold, a sphere which is biased outward in the mold radial direction and engages with the first annular groove; It is urged inward in the radial direction of the mold, and due to centrifugal force based on the rotation of the front cover following the mold, it projects outward in the radial direction of the mold against the urging force, and this projection causes the second A wedge body that engages with the annular groove is provided.

Function: With this type of device, when the front lid is brought close to the open end of the centrifugal casting mold, the sphere engages with the first annular groove, so the front lid is temporarily fixed to the mold. Also, when the mold rotates, the wedge body engages with the second annular groove due to centrifugal force, and the wedge action forces the front lid toward the mold; Since the wedge body serving as an engagement member for this purpose is attached to the front lid side, maintenance and inspection thereof can be made easy, and the structure of the centrifugal casting mold can be simplified.

Embodiment Hereinafter, an embodiment of the present invention will be described based on the drawings. In FIGS. 1 and 2, reference numeral 21 denotes a horizontal centrifugal casting mold, which is capable of casting a cast iron pipe 22. As shown in FIG. An arm 23 is movable towards and away from the open end 24 of the mold 21 in the axial direction of the mold. A rotating body 25 in the mold axis direction is supported at the tip of the arm 23, and this rotating body 25 includes:
A front lid 27 that holds the core 26 and is attached to and removed from the open end 24 of the mold 21 by movement of the arm 23 in the mold axial direction is attached in the middle with a cylindrical body 28 interposed therebetween.

An annular body 29 that is fitted onto the rotating body 25 is fixed to the tip of the arm 23 . Reference numerals 30 and 30 denote a pair of annular supports that oppose each other, and are fitted around the rotating body 25 in the same manner as the annular body 29, and are configured to be movable in the axial direction while being guided by the annular body 29. Further, a compression coil spring 31 is interposed between the supports 30, 30 to bias the supports 30, 30 away from each other.

A pair of opposing tapered surfaces 32, 32 are formed on the outer periphery of both ends of the rotating body 25, and the supporting body 3
Other tapered surfaces 33, 33 corresponding to the tapered surfaces 32, 32 are formed at 0, 30. Therefore, by urging the supports 30, 30 away from each other by the spring 31, the tapered surfaces 32, 32 are pressed against each other as shown by the imaginary lines in FIG. It will be supported by supports 30, 30.

An annular body 34 facing the cylindrical body 28 is fixed to the tip of the open end 24 of the centrifugal casting mold 21, and an inner circumferential taper 35 is formed on the inner surface of the annular body 34 at the open end. A first annular groove 36 on the end side and a second annular groove 37 on the back side are formed at a distance in the axial direction. Numerals 38 and 39 are dust removal holes, which remove dust accumulated in the annular grooves 36 and 37 from the mold 2.
It can be discharged by the centrifugal force caused by the rotation of 1. The first annular groove 36 has an arcuate or linear chamfered portion 40 formed at its groove edge, and both side walls 41 and 42 of the second annular groove 37 are mutually directed inward in the mold axis direction. They are formed in an inclined shape that separates them. A plurality of engagement units 43 are attached to the cylindrical body 28 in the circumferential direction. Each engagement unit 4
3 has a first cylindrical portion 44 in the mold radial direction facing the first annular groove 36 and a similar second cylindrical portion 45 facing the second annular groove 37. 46 is a mounting plate.

A spherical body 47 that can be engaged with the first annular groove 36 is disposed within the first cylindrical portion 44 . That is,
A constricted portion 48 is formed at the tip of the first cylindrical portion 44 , and the sphere 47 is projected toward the first annular groove 36 through this constricted portion 48 , and is prevented from falling off from the cylindrical portion 44 by this constricted portion 48 . is prevented. 49
is a compression coil spring that urges the sphere 47 via the receiving seat member 50 in the direction of the first annular groove 36, that is, outward in the radial direction of the mold. 51 is a cap for receiving the reaction force of the spring 49.

A wedge body 52 is disposed within the second cylindrical portion 45 . This wedge body 52 is connected to the second annular groove 37
A wedge portion 53 that can protrude from the cylindrical portion 45 toward
, a rod 54 formed integrally with this wedge portion 53, and a flange 55 attached to the tip of the rod 54. An inner flange 56 is formed on the inner surface of the cylindrical portion 45, and a compression coil spring 57 is interposed between the inner flange 56 and the flange 55 to bias the wedge body 52 inward in the radial direction of the mold. There is. 58 is a cap, and 59 is an air vent hole in the cylindrical portion 45.

Next, the installation work of the core 26 will be explained in detail. First, the core 26 is attached to the front lid 27, and in this state, the arm 23 is brought close to the centrifugal casting mold 21. Then, the front lid 27 and the core 26 are inserted into the annular body 34, and the wedge body 52 is retracted into the second cylindrical portion 45 by the action of the spring 57, so the front lid 27 is It is inserted inside the annular body 34. On the other hand, since the sphere 47 is urged outward in the radial direction of the mold by the action of the spring 49, it is guided by the inner circumferential tapered surface 35, fits into the first annular groove 36, and engages with the chamfered portion 40. match. The position of the sphere 47 in the mold axis direction is determined so that the front cover 27 and the core 26 are set at predetermined positions in the mold when the sphere 47 engages with the first annular groove 36. Therefore, the sphere 47 functions as a positioning member for the front lid 27 and the core 26.

Note that when the sphere 47 engages with the first annular groove 36, both the supports 30, 30 are brought closer to each other against the force of the spring 31, as shown in the figure, so that the tapered surfaces 32, 33 are brought closer to each other. The rotating body 25 and the supports 30, 30 are separated from each other and are edged. In order to bring the supports 30, 30 closer to each other, arm 2
It is preferable to use a stopper that locks onto the supports 30, 30 as the parts 3 move, or a suitable drive device can also be used.

When the mold 21 is rotated, since the sphere 47 is pressed against the first annular groove 36, the front lid 27 also starts rotating in conjunction with this. When the rotation becomes high speed, a large centrifugal force acts on the wedge body 52, and this centrifugal force causes the wedge body 52 to rotate against the force of the spring 57.
As a result, the wedge portion 53 engages with the side wall 41 of the second annular groove 37 on the open end side. Then, the front lid 27 is strongly pressed against the mold 21 by the wedge action of the wedge portion 53. Therefore,
When molten metal is poured into the mold 21, the thrust force due to the molten metal is received by the pressing force exerted on the front cover 27, and a cast iron pipe 22 is formed as shown in the figure.

Once the cast iron pipe 22 has been formed, the rotation of the mold 21 is stopped. Then, the centrifugal force acting on the wedge body 52 disappears, and this wedge body 52
7, it retracts into the second cylindrical portion 45. Therefore, the arm 23 is moved away from the mold 21, the rotating body 25 and the supports 30, 30 are connected, and the front cover 27 is removed from the mold 21.

Effects of the Invention As described above, according to the present invention, since the wedge body serving as an engagement member for pressing the front lid against the mold is attached to the front lid side, maintenance and inspection thereof can be made easy. Not only that, but the structure of the centrifugal casting mold can be simplified.

[Brief explanation of drawings]

FIG. 1 is a sectional view of an embodiment of the present invention when viewed from the front;
FIG. 2 is a side cross-sectional view of the main parts thereof, and FIG. 3 is a front cross-sectional view of the conventional example. 21...Centrifugal casting mold, 22...Cast iron pipe, 24
... Opening end, 26 ... Core, 27 ... Front lid, 36
...First annular groove, 37... Second annular groove, 43
. . . Engagement unit, 47 . . . Sphere, 52 . . . Wedge body.

Claims (1)

[Claims] 1. A first annular groove and a second annular groove are formed at a distance in the axial direction on the inner surface of the open end of the centrifugal casting mold, and a core is held and the centrifugal a front cover that is approached to the open end of the casting mold; a sphere that is biased radially outwardly of the mold and engages the first annular groove; and a sphere that is biased radially inwardly of the mold, , a wedge body that protrudes outward in the mold radial direction against the biasing force due to centrifugal force based on rotation of the front cover following the mold, and engages with the second annular groove due to this protrusion. A core setter for centrifugal casting machines.