KR200312686Y1 - Molds for manufacturing shell mold of reducer for concrete pump car - Google Patents

Abstract

The present invention relates to a mold and core mold for producing a reducer shell mold of a concrete pump car and a shell mold manufacturing method using the same. More specifically, the shell mold manufacturing mold housing the core mold is tapered to have a narrow width in the upper direction, the coated sand is supplied to heat the shell mold, and the molded shell mold is deformed without deformation. The present invention relates to a mold and core mold for producing a reducer shell mold of a concrete pump car that can be separated from a mold and a core mold, and a method for manufacturing a shell mold using the same.

The mold for concrete pump car reducer shell mold according to the present invention is a cylindrical body having a predetermined thickness, and in a rectangular mold having a constant height and width such that an upper surface and a lower surface are opened and a core mold can be accommodated therein. Both sides of the mold in the width direction are tapered so as to be narrow in the width direction from the lower surface to the upper surface, and are separated into two parts on both sides in the longitudinal direction, and the separated work is performed so that the two separated parts are rotatable. It further comprises a hinge provided on the outside of the side.

Description

Mold and core mold for manufacturing concrete pump car reducer shell mold {MOLDS FOR MANUFACTURING SHELL MOLD OF REDUCER FOR CONCRETE PUMP CAR}

The present invention relates to a mold and core mold for producing a reducer shell mold of a concrete pump car and a shell mold manufacturing method using the same. More specifically, the shell mold manufacturing mold housing the core mold is tapered to have a narrow width in the upper direction, the coated sand is supplied to heat the shell mold, and the molded shell mold is deformed without deformation. The present invention relates to a mold and core mold for producing a reducer shell mold of a concrete pump car that can be separated from a mold and a core mold, and a method for manufacturing a shell mold using the same.

The reducer used in the concrete pump car is a tapered metal tube with an annular protrusion formed at both ends for clamping. The conventional reducer taper tube was manufactured by welding the joints by rolling the iron plates and welding the pledges to form annular protrusions for clamping at both ends. However, the reducer tube manufactured by welding the steel sheet as described above is easily worn by the concrete transported into the inside, the life is short, and the welding and bending process takes a lot of time and cost, as shown in Figure 1 weld line ( 10, 20) is exposed to the outside has a defect that the appearance is not beautiful.

In addition, a method of making a CO ₂ mold for a reducer using a wooden mold and casting by pouring molten metal is known. There is a drawback that cannot be used temporarily. In addition, the seam is not smooth, there is a problem that requires a process such as grinding for the finishing process.

Casting using shell molds has the disadvantages of high dimensional accuracy, high casting surface, high mold strength, low breathability and low moisture, and low casting defects. In particular, when the large shell mold is separated from the mold by pressing a knock pin, the shell mold may be damaged or deformed, or thermal deformation may occur due to cooling, which may not be suitable for large castings. It is known.

One aspect of the present invention is to provide a mold and core mold for producing a shell mold for casting a concrete pump car reducer, which is usually a large member of 120 cm or more, and a shell mold manufacturing method using the same. In particular, the present invention can be easily separated from the mold and the mold for manufacturing the shell mold without damage and deformation, and accommodated inside the mold and the tapered upward mold to save the coated send It is an object to provide a core mold.

In addition, the object of the present invention is to provide a mold in which the tapered mold is separated into two parts and is rotatably coupled by a hinge so that the molded shell mold can be easily detached without breakage and deformation.

Another aspect of the present invention is to provide a method for producing a shell mold for concrete pump car reducer without deformation and breakage by using the mold and core mold. In particular, when the shell mold is separated from the mold and the mold, the present invention provides a method of separating the shell mold without lifting the mold and using the knock pin after lifting the mold and the shell mold to the upper part of the core mold. It aims to do it. When the shell mold is to be separated using the knock pin, the mold is first separated to provide a method of separating the shell mold from the core mold after the mold mold is prevented from being deformed by friction between the mold and the shell mold.

1 is a perspective view of a reducer for a concrete pump car manufactured by conventional steel sheet bending and welding

2 is a schematic perspective view illustrating a state in which a mold and a core mold for manufacturing a shell mold for a concrete pump car reducer according to an embodiment of the present invention are installed;

3 is a cross-sectional view taken along the line A-A of FIG.

4 is an enlarged cross-sectional view of a portion B of FIG.

5 is a schematic perspective view showing a developed state of the mold for manufacturing a shell mold for a concrete pump car reducer according to an embodiment of the present invention;

6 is a perspective view of a core mold for manufacturing a shell mold for a concrete pump car reducer according to an embodiment of the present invention

7 and 8 are a perspective view of the upper and lower molds of the shell mold manufactured by the mold and core mold for producing a shell mold for a concrete pump car reducer according to an embodiment of the present invention and a shell mold manufacturing method using the same

9 is a schematic illustration of one embodiment of a shell mold manufacturing method using a mold and a core mold for producing a shell mold for a concrete pump car reducer according to the present invention

10 is a schematic diagram of another embodiment of a shell mold manufacturing method using a mold and a core mold for manufacturing a shell mold for a concrete pump car reducer according to the present invention;

<Short description of symbols>

100 shell mold 130 inner protrusion

150 lower groove 160 coupling protrusion

180, 181, 182, 183 Ring 190, 191 Guide

200 core mold 300 metal plate

310 knock pin

The mold for concrete pump car reducer shell mold according to the present invention for achieving the above object is a cylinder having a predetermined thickness, and has a constant height and width so that the upper and lower surfaces are opened and the core mold can be accommodated therein. In the rectangular mold, both sides of the mold in the width direction are tapered so as to be narrow in the width direction from the lower surface to the upper surface, and are separated into two parts on both sides in the longitudinal direction, and the two separated portions are separated. It characterized in that it further comprises a hinge provided on the outer side of the separated one side to be rotatable.

In addition, the mold for concrete pump car reducer shell mold according to the present invention is characterized in that it further comprises a plurality of protrusions extending from the inner surface of the mold.

In addition, the mold for concrete pump car reducer shell mold according to the present invention is characterized in that a plurality of grooves are formed in the lower surface of the mold to accommodate the projection.

In addition, the mold for concrete pump car reducer shell mold according to the present invention is characterized in that it further comprises a guide extension extending from the outer surface in the width direction of the mold divided into the two parts.

In the mold according to the present invention, both side surfaces in the width direction of the mold are tapered to narrow the width from the lower surface to the upper surface direction, and are separated into two parts at both sides in the longitudinal direction, and the two separated portions are It further comprises a hinge provided on the outside of the separated one side to be rotatable, it is possible to lift the mold to the upper portion of the molded shell mold to separate the shell mold from the mold without damage and deformation. In addition, since the mold is tapered inclined, it is possible to reduce the amount of coated sand used for shell molding than when the mold is not inclined. In particular, it further comprises a plurality of protrusions protruding from the inner surface of the mold, when the mold is lifted to the upper side, the protrusions restrain the shell mold to separate the shell mold from the core mold, and then By deploying using the hinge, the shell mold can be safely separated without being damaged or deformed.

The core mold for concrete pump car reducer shell mold according to the present invention has a semicircular cross section and a tapered semicircle of a predetermined length having one end diameter larger than the diameter of the other end, and spaced a predetermined distance from one end of the tapered semicircle cylinder. It characterized in that it comprises a first arc-shaped projection formed on the circumference of the semi-cylinder in the position, and a second arc-shaped projection formed on the circumference of the semi-circular cylinder at a position spaced a predetermined distance from the other end of the tapered semi-cylinder.

In addition, the core mold for concrete pump car reducer shell mold according to the present invention is characterized in that a plurality of grooves are formed on the surface formed by the diameter of the semi-circle cylinder.

The core mold according to the present invention is accommodated and used inside the mold, and in particular, there is an advantage in that the groove can be accurately positioned by using a groove formed on the surface formed by the diameter of the semi-circle cylinder.

The method for manufacturing a shell mold for producing a concrete pump car reducer according to the present invention includes a predetermined metal plate, a core mold for the concrete pump car reducer shell mold mounted on the predetermined metal plate, and an upper portion to accommodate the core mold coated with a release agent. A heating step of heating the mold for the concrete pump-car reducer shell mold without a plurality of protrusions protruding from the inner surface mounted therefrom to a temperature in the range of 250 ° C. to 350 ° C., and coated sand to the upper surface of the heated mold. A shell mold forming step of forming a reducer manufacturing cell mold by supplying a mold, a mold separating step of separating the molded shell mold and the mold by lifting the mold upward, and pushing the molded shell mold upward to shell It characterized in that it comprises a shell mold separation step of separating the mold and the core mold.

In addition, the method for manufacturing a shell mold for producing a concrete pump car reducer according to the present invention, the upper portion to accommodate a predetermined metal plate, a concrete mold for concrete pump car reducer shell mold mounted on the predetermined metal plate, and a core mold coated with the release agent. A heating step of heating the mold for the concrete pump car reducer shell mold having a plurality of protrusions protruding from the inner side of the mold mounted therefrom to a temperature in the range of 250 ° C. to 350 ° C., and coated to the upper surface of the heated mold. Shell mold forming step of supplying sand to form a cell mold for reducing reducer, Core mold separation step of lifting the mold up to separate the mold and the molded shell mold from the core mold, and the mold A shell mold separating the mold and the molded shell mold by rotating two parts about a hinge. Characterized in that it comprises a re-phase.

The manufacturing method according to the present invention can be easily separated from the mold and the mold by lifting the mold to the top without breaking and deformation of the large shell mold formed using a tapered mold that is not narrow in the upper direction.

Hereinafter, with reference to the accompanying drawings will be described a preferred embodiment of the present invention;

2 is a schematic perspective view showing a state in which a mold and a core mold for manufacturing a shell mold for a concrete pump car reducer according to an embodiment of the present invention are installed, FIG. 3 is a cross-sectional view taken along line AA of FIG. 2, and FIG. 4 is B of FIG. 2. 5 is an enlarged cross-sectional view of a part, and FIG. 5 is a schematic perspective view showing a developed state of a mold for manufacturing a shell mold for a concrete pump car reducer according to an embodiment of the present invention, and FIG. 6 is a concrete pump car reducer according to an embodiment of the present invention. It is a perspective view of the core mold for manufacturing a shell mold.

As shown in FIG. 2, the mold 100 for manufacturing the shell mold for the concrete pump car reducer according to the present embodiment is a rectangular cylinder having a predetermined thickness, and the upper surface 101 and the lower surface 102 are formed. It is opened and has a constant height and width so as to accommodate the core mold therein. In particular, in the mold of the present invention, both side surfaces 103 and 104 in the width direction are tapered so that the width thereof becomes narrower from the lower surface 102 to the upper surface 101 as shown in FIG. 3. In addition, the two parts 110 and 120 are separated from both sides in the longitudinal direction, and the hinge 140 is provided on the outer side of the separated one side so that the two separated parts are rotatable. Therefore, since the separated parts 110 and 120 of the mold 100 can be rotated about the hinge 140 and developed as shown in FIG. 5, the shell mold S molded and housed therein is formed into a mold. It has a structure that can be discharged from. At least one of the two separate portions of the mold 100 includes an extension portion 121 extending outwardly to secure a space for installing a mold for forming a runner in the shell mold. .

In addition, a plurality of protrusions 130, 131, and 132 protrude from the inner surface of the mold 100. In FIG. 2, only the protrusions formed on the separated member 110 are illustrated, but as shown in FIG. 3, a plurality of protrusions protrude at positions corresponding to the inner surface of the opposite member 120. Therefore, as shown in (b) of FIG. 10, when the mold is lifted upward, the molded shell mold S is separated from the core mold together with the mold 100.

In addition, a plurality of grooves 150 are formed on the lower surface of the mold 100 to accommodate the fixing protrusions 330 and 340 formed in the metal plate 300, as shown in FIG. 3. Therefore, when the mold 100 is mounted on the metal plate 300, the mold 100 may be accurately mounted at a predetermined position.

In addition, as shown in Figure 4, the engaging projection 160 and the coupling groove (on each side to which the two separate parts 110, 120 on the opposite side to which the hinge 140 of the mold 100 is fixed) are joined. 170 is formed in a corresponding position, it is possible to uniformly match the height when the separated portion is combined.

In addition, when lifting the mold, guide extensions 190 and 191 are provided to be guided while sliding to the guide guide 320 installed on the metal plate 300 to guide the mold to be constantly horizontal. Guide guide 320 may be separated from the metal plate 300 according to the relative position with the guide extension (190, 191) may be installed separately. Although not shown, a roller may be installed in the guide extension parts 190 and 191, and the pipe 100 may be used as a guide guide to maintain horizontality when the mold 100 is lifted up. In addition, on the opposite side to which the hinge 140 of the separated parts 110 and 120 of the mold 100 is attached, handles 192 and 193 for opening the mold are provided, respectively. In addition, in order to lift the mold 100 easily, a plurality of rings 180, 181, 182, and 183 are processed on the upper surface of the mold 100. Although not shown, the mold 100 may be lifted upward by using a pneumatic or hydraulic cylinder by hanging a rope or the like on the ring.

Core mold 200 for the concrete pump car reducer shell mold according to an embodiment of the present invention, as shown in Figure 6, the cross section is semi-circular and the diameter of one end 220 is greater than the diameter of the other end 210 in the longitudinal direction A first arc-shaped protrusion 240 formed at the circumference of the semi-circular cylinder at a position spaced apart from the one end portion 220 of the tapered semi-cylinder cylinder by a tapered semi-circular cylinder, and the other end 210 of the tapered semi-cylinder cylinder. It is composed of a second arc-shaped protrusion 230 formed in the circumference of the semi-cylinder at a position spaced a predetermined distance from the). In addition, a plurality of grooves 250 are formed on the surface formed by the diameter of the semi-cylindrical cylinder as shown in FIG. 3. The plurality of grooves 250 accommodate the fixing protrusions 350 protruding from the metal plate 300 so that the core mold 200 can be easily positioned when the core mold 200 is mounted on the metal plate 300.

Hereinafter, a method of manufacturing shell molds for a concrete pump car reducer using the mold 100 and the core mold 200 according to the present invention will be described.

7 and 8 are a perspective view of the upper and lower molds of the shell mold manufactured by the mold and core mold for producing a concrete pump car reducer shell mold and a shell mold manufacturing method using the same according to an embodiment of the present invention, Figure 9 is a present invention Figure 1 is a schematic explanatory view of one embodiment of a shell mold manufacturing method and shell mold manufacturing method for a concrete pump car reducer by using a mold, and Figure 10 is a shell mold manufacturing using a mold and a core mold for manufacturing a shell mold for a concrete pump car reducer according to the present invention A schematic illustration of another embodiment of the method.

7 is a perspective view of the shell mold lower mold 400, and FIG. 8 is a perspective view of the shell mold upper mold 500. The upper mold is formed with a tap 530, and the lower mold is formed with a guide part 430 for guiding the molten metal supplied through the tap to flow into the mold. In order to form the water supply 53 and the guide part 430, a metal mold 300 processed in a suitable shape is installed in the extension part 121 of the mold 100 shown in FIG. 2. In addition, grooves and protrusions are formed at appropriate positions of the metal plate 300 to form the upper and lower coupling protrusions 410 and 510 and the coupling grooves 420 and 520.

First, a method of manufacturing the shell mold S for the concrete pump car reducer using the mold 100 in which the protrusions 130, 131, 132, and 133 are not formed on the inner side will be described. First, the mold 100 is mounted from the top to accommodate the core mold 200 and the core mold 200 for the concrete pump car reducer shell mold coated with release material on a predetermined metal plate 300, and the temperature is in the range of 250 ° C to 350 ° C. The metal plate 300, the core mold 200, and the mold 100 are heated to be (FIG. 9A). Next, the coated sand is supplied to the upper surface of the heated mold, and the shell mold S for the reducer is formed by maintaining the temperature of the mold and the mold for 5 to 10 minutes (FIG. 9B). Next, the mold 100 is lifted upward to separate the molded shell mold S and the mold 100 (FIG. 9C). Next, the molded shell mold S is pushed upward using the knock pin 310 to separate the shell mold S and the core mold 200 (FIG. 9D).

According to the method of the present invention, since the large shell mold is separated using the knock pin after removing the mold 100, deformation and breakage of the shell mold S due to the friction between the mold 100 and the shell mold S. Can be prevented.

FIG. 10 illustrates a method of manufacturing the shell mold S for the concrete pump car reducer using the mold 100 in which protrusions 130, 131, 132, and 133 are not formed on the inner side. First, the mold 100 is mounted from the top to accommodate the core mold 200 and the core mold 200 for the concrete pump car reducer shell mold coated with the release material on a predetermined metal plate 300, and the range of 250 ℃ to 350 ℃ The metal plate 300, the core mold 200, and the mold 100 are heated so as to have a temperature (FIG. 10A). Next, the coated sand is supplied to the upper surface of the heated mold, and the shell mold S for the reducer is formed by maintaining the temperature of the mold and the mold for 5 to 10 minutes (FIG. 10B). Next, the mold 100 is lifted upward to separate the mold 100 and the molded shell mold S from the core mold 200 (FIG. 10C). Next, the two separate parts 110 and 120 of the mold 100 are rotated about the hinge 140 to separate the mold 100 and the molded shell mold S (FIG. 10D). ).

According to the method of the present invention, the mold 100 and the large shell mold S formed by the protrusions 130, 131, and 132 of the mold 100 are integrally separated from the core mold 200, and the mold Since the shell mold (S) is separated from the mold by unfolding (100), the molded shell mold (S) can be safely separated from damage and deformation.

According to the upper tapered mold for manufacturing the shell mold for casting the concrete pump car reducer of the present invention and the core mold accommodated inside the mold, the molded shell mold can be easily separated without damage and deformation. This will save the send. In particular, the tapered mold of the present invention is separated into two parts and rotatably coupled by a hinge, thereby providing a mold that can be easily separated without breaking and deformation of the molded shell mold.

In addition, according to the method of manufacturing a shell mold for a concrete pump car reducer without deformation and damage by using the mold and the core mold, when the shell mold is separated from the mold and the mold, the mold and the shell mold are lifted to the upper portion of the core mold. After lifting up and separating, the shell mold can be removed without using the knock pin by developing the mold, thereby preventing breakage and deformation of the shell mold by the knock pin. When the shell mold is to be separated by using the knock pin, the mold may be separated first and the shell mold may be separated from the core mold so that deformation due to friction between the mold and the shell mold does not occur.

An embodiment of the present invention described above and illustrated in the drawings should not be construed as limiting the technical spirit of the present invention. The scope of protection of the present invention is limited only by the matters described in the claims, and those skilled in the art can change and change the technical idea of the present invention in various forms. Therefore, such improvements and modifications will fall within the protection scope of the present invention as long as it will be apparent to those skilled in the art.

Claims (6)

A cylindrical body having a predetermined thickness, wherein the upper and lower surfaces are opened, and in a rectangular mold having a constant height and width to accommodate the core mold therein, Both sides of the mold in the width direction are tapered so as to be narrow in the width direction from the lower surface to the upper surface, and are divided into two parts on both sides in the longitudinal direction, The mold for the concrete pump car reducer shell mold further comprises a hinge provided on the outside of the separated one side so that the two separate portions are rotatable. The method of claim 1, The mold for concrete pump car reducer shell mold further comprises a plurality of protrusions protruding from the inner surface of the mold. The method according to claim 1 or 2, The mold for concrete pump car reducer shell mold, characterized in that a plurality of grooves are formed in the lower surface of the mold to accommodate the projection. The method of claim 3, The mold for concrete pump car reducer shell mold further comprises a guide extension extending from the outer surface in the width direction of the mold divided into two parts. Semi-circular cross section, tapered semi-circle of constant length with one end diameter larger than the other end diameter, A first arc-shaped protrusion formed on the circumference of the semi-cylinder at a position spaced a predetermined distance from one end of the tapered semi-cylinder, And a second arc-shaped protrusion formed on the circumference of the semi-cylinder at a position spaced a predetermined distance from the other end of the tapered semi-cylindrical cylinder. The method of claim 4, wherein The core mold for concrete pump car reducer shell mold, characterized in that a plurality of grooves are formed on the surface formed by the diameter of the semi-cylindrical cylinder.