KR950005287B1 - Forming equipment of mold - Google Patents

Abstract

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Description

Molds for molding of tubular products with ends extending radially outwardly and molding machines using the same

1 is a perspective view of a casting circle according to the present invention.

2 is a front cross-sectional view of FIG.

3 is an exploded perspective view of the mold forming apparatus according to the present invention.

4 is a front sectional view taken along the lines A-A, B-B and C-C with the mold forming apparatus of FIG. 3 assembled;

Figure 5 is a cross-sectional perspective view of the state of the mold produced by the mold-forming apparatus of the present invention and the tubular product molded by using the mold.

6 is a cross-sectional perspective view showing a state in which a tubular product molded from a mold manufactured according to the present invention is used as a roller seal of a track roller.

Figure 7 shows an embodiment of a conventional mold, (a) is a perspective view of a conventional mold, (b) is an enlarged front cross-sectional view of (a).

8 is an exploded perspective view showing another embodiment of the conventional mold.

* Explanation of symbols for main parts of the drawings

1: round 2: support ring

3: heat-resistant rubber 10: lid

13: clasp 14, 31: heating wire

20: mold box 23: protruding part for pouring

30: base 33: long hole

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a prototype for molding a tubular product having a radially outwardly extending end portion and a molding apparatus using the prototype, in particular a track applied to a track wheel of a tracked vehicle such as a bulldozer or other heavy equipment. Rollers are fitted at both ends of the rotating shaft of the track roller and the edges of both ends extend outwardly by a predetermined length, such as a roller seal or floating seal, which seals dust, gravel, and water from entering the rotating shaft. The present invention relates to a circle applied for forming a tubular product having a flanged portion and a mold forming apparatus using the circle.

In general, tubular products such as roller seals and floating seals, which are fitted on the rotating shaft of the track rollers used for the track wheel of a bulldozer such as a bulldozer, are sealed to prevent dust, gravel, water, etc. from entering the outer circumference thereof. The 'O' ring of synthetic rubber material is used, and it is necessary to expand and form a flange part of a predetermined length to prevent the 'O' ring fitted on the outer circumference outward from both edges of the tubular product. Since tubular products such as roller seals and floating seals are usually made of alloy steel containing chromium-molybdenum to enhance wear resistance and corrosion resistance, molding using molds rather than manufacturing by lathe machining or forging This is known to be preferable.

On the other hand, in order to manufacture such a tubular product, a prototype must first be made, and a mold must be made using the prototype. Since the prototype of such a tubular product is made of a hard material, it is shown in FIGS. As shown in (b), two molds consisting essentially of the inner mold 51 and the outer mold 52 are used. When using the mold, the outer mold 52 is attached to the inner mold 51. After inserting and assembling the molten water through the spout 53, the molten water flows into the product forming space 55 along the hot water path 54 and solidifies. Then, the mold is separated to obtain a desired product. .

However, in the mold for casting a conventional tubular product, since the two molds are assembled, the inner mold 51 and the outer mold 52 are not assembled correctly, so that a product of accurate roundness cannot be obtained, and the production of the mold is complicated. There was a problem.

In addition, as shown in FIG. 8 as another conventional method for casting the tubular product, a mold consisting of three of the first mold 61, the second mold 62 and the core mold 63 is used. When using these molds, when these molds are assembled and the molten metal is poured into the spout 64, the molten water flows into the product forming space along the furnace 65 to solidify, and then the mold is separated to obtain a product.

However, this mold is also difficult to obtain a product having an accurate roundness, unless it is assembled correctly like the mold according to the conventional embodiment described above, and the first mold 61 and the second mold 62 are assembled alternately even a little. Then, a step is formed on the manufactured product, and the grinding process is additionally required to remove it, which complicates the manufacturing process, and since the mold is composed of three molds, the manufacturing of the mold is complicated. Since only one product can be made, there is a problem that the productivity per unit time is significantly low.

The present invention is to solve the problems of the conventional mold as described above, the object of the circle and its circle for use in the casting of tubular products having radially outwardly extended ends that can be mass cast in a simple manner It is to provide a mold forming apparatus using.

Circular mold for casting of the present invention for achieving the above object has an inner diameter of a predetermined size and a fastening portion is formed on the upper surface, an annular metal support ring formed with a screw hole for each predetermined position of the lower surface and the fastening portion on the support ring It is characterized by consisting of a heat resistant rubber having heat resistance and flexibility attached and bonded in the same shape as the desired cast product.

In addition, the mold forming apparatus of the present invention for achieving the above object is formed with a plurality of annular grooves are arranged in a predetermined shape on the inner bottom surface made of a substrate and a rectangular wall arranged in a predetermined form, the center of each annular groove Holes are formed through the mold box, the center of the area surrounded by each annular groove formed in the mold-shaped protrusions connected to each of the circular structure, the heating wire is built in, each annular constituting the mold box A bottom plate for heating having a long hole is formed at a position corresponding to the pushing hole at the center of the groove, a lid having a structure having a separate heating wire therein and a clasp formed at a predetermined position on the upper surface, and each pushing hole in the mold box and for heating. It is fitted through each long hole on the bottom plate, and is reciprocated up and down by the action of an external driving means with the head extended at the top. It characterized consisting plunger is copper.

Hereinafter, the mold for forming the mold of the tubular product of the present invention configured as described above according to the accompanying drawings and the mold forming apparatus using the circle will be described in more detail.

A prototype 1 is shown for casting a tubular article with both ends radially outwardly made in accordance with the invention of FIGS. 1 and 2. In particular, the circle (1) shown is an example of a roller seal or a floating seal fitted to the rotating shaft of the track roller that is applied to a tracked vehicle such as a bulldozer to function as a seal. The circle 1 is composed of a heat resistant rubber 3 having the same shape as that of a desired product, and a support ring 2 made of metal for supporting the heat resistant rubber 3, the heat resistant rubber 3 having an end portion thereof. The flange portion 5 which is slightly extended outward is formed on the inside, and 0.8% by weight of a vulcanizing agent (TC-8A) is added to 100% by weight of silicone rubber, followed by primary vulcanization at a temperature of 170 ° C for 10 minutes, and 200 Obtained by a conventional method of secondary vulcanization over a period of 4 hours at a temperature of < RTI ID = 0.0 > C, < / RTI >

On the other hand, the support ring 2 has an annular fastening portion 6 protrudingly formed along its upper surface, and a few rows of grooves are formed on the outer circumference thereof, so that the heat resistant rubber 3 is attached to the support ring 2. It is fixed and not separated. In addition, in the appropriate place of the lower surface of the support ring 2, the screw hole 4 for fixing to the casting apparatus which is demonstrated later is formed. The circular shape 1 of this structure is made by placing a support ring 2 at the bottom of the mold and pouring the heat-resistant rubber 3 in a liquid state thereon and solidifying it.

3 shows a mold forming apparatus according to the present invention. The mold forming apparatus is mainly composed of a mold box 20, a heating base plate 30 and a lid 10, the mold box 20 is composed of a substrate 21 and a rectangular wall 22, Fixing grooves 25 for coupling the substrate 21 to the bottom plate 30 are formed at both sides of the 21.

In addition, the circular shape 1 according to the present invention is fixed to the upper surface of the substrate 21 in the rectangular wall 22 at an appropriate location. For this purpose, the support ring of the circular shape 1 is formed at a predetermined position of the upper surface of the substrate 21. 2) is formed an annular groove 26 is inserted into the hole in the bottom of the annular groove 26 is formed in the position corresponding to the screw hole (4) formed on the lower surface of the support ring (2) through The support ring 2 is coupled so that the circle 1 is fixed to the substrate 21.

On the other hand, the center of the annular groove 26 is formed with a push-hole 28, for pushing the completed mold in the mold box 20 through the push-hole 28 to separate from the mold box 20 The push rod 42 of the push rod 40 is fitted, the head 41 of the expanded form is integrally formed on the upper end of the push rod 40.

On the other hand, in the center of the portion surrounded by the annular grooves (26) on the substrate 21 is formed a tangs forming protrusions 23 for forming a tang of the mold to be made, this tangs forming projections 23 At the position from the annular groove 26 to each of the annular grooves 26, there is formed a waterway forming protrusion 24 for connecting the heat resistant rubber 3 of the circular shape 1 to form a water flow path through which the water flows.

The lid 10 is formed of a substrate 11 and a bottom plate 12, and a clasp 13 for lifting the lid 10 is formed on an upper surface thereof, and a pin (not shown) is fitted to the clasp 13. The pin hole 15 is formed, and when the pin is fitted therein, a predetermined hook is hooked on the pin. In addition, a groove is formed in the substrate 11 and the heating wire 14 is embedded along the groove.

The heating bottom plate 30 also has a heating wire receiving groove 32 formed therein, such as the lid 10, and another heating wire 31 is embedded therein. In addition, a long hole 33 is formed radially through the base plate 30 at a position corresponding to the pusher hole 28 of the mold box, and the pusher rod 42 is inserted into the bottom plate 30 so as to reciprocate. At this time, the long hole 33 is formed to be long because it can be used as a single base plate 30 regardless of whether the size of the mold box 20 is small or large, according to the size change of the product bar 42 It is to cope with the change of position of

In addition, on both sides of the base plate 30, fixing holes 34 are formed corresponding to the positions of the fixing grooves 25 formed on both sides of the mold box 20, so that the fixing holes 34 and the mold box ( The mold box 20 and the bottom plate 30 are coupled to each other by a fastening means such as a bolt nut through the fixing groove 25 on the top. The reason for the long length of the fixing long hole 34 is to be able to use in response to the size change of the mold length 20 as in the long hole (33).

On the other hand, in the case of casting the product by using the mold made by the mold forming apparatus of the present invention, if a plurality of molds are stacked and water is poured only into the spouts of the mold on the top side, it flows down through the spouts of the stacked molds to the bottom side. The casting process is performed by filling the mold from the located mold and then filling the molds on top of each other. In order to make the casting process simpler and more efficient, two or more points on the substrate in the wall 22 of the mold box 20 are made. The convex portion (not shown) corresponding to the concave portion 29 is formed at a corresponding position of the bottom plate 12 of the lid 10 which forms the concave portion 29 and contacts the bottom surface of the mold made correspondingly thereto. Can be formed. In this way, a convex portion of a predetermined portion is formed on the upper surface of the mold, and a concave portion 29 is formed on the mold bottom surface at the same position as the convex portion, and convex portions and concave portions formed on the molds facing each other when a plurality of molds are stacked. By matching the positions, multiple molds can be stacked simply and accurately. In addition, in order to continuously penetrate the casting holes between these molds, the height of the pouring hole forming protrusion 23 of the mold box 20 is formed to be equal to the height of the wall 22 so that the pouring holes of the mold to be made penetrate. .

A casting prototype configured as described above and a process of manufacturing a mold using the mold forming apparatus using the prototype will be described with reference to FIG.

First, the mold box 20 is placed on the bottom plate 30 and fixed with the bolt nut through the fixing groove 25 and the fixing hole 34 of the mold box 20, so that the bottom plate 30 and the mold box 20 are fixed. ). At this time, the annular groove (26) of the mold box 20 is assembled with a circular (1) and the push rod 40 is fitted into the push hole 28 and the long hole (33). In this state, the molding sand 50 is filled in the wall 22 of the mold box 20, the lid 10 is covered, and then installed in the lid 10 and the bottom plate 30 positioned above and below the mold box 20, respectively. The heating wire 14, 31 is connected to a power source to generate heat to heat the casting sand 50 in the mold box 20 to cure. At this time, the heating temperature is to be about 230-250 ℃ and when the temperature rises higher than the ionic automatically to keep the temperature constant.

When the casting sand 50 is hardened through the heating step, the lid 13 is lifted up to remove the lid from the mold box 20. Thereafter, when the external drive means connected to the push rod 40 is operated, the push rod 40 inserted into the hole 28 of the casting box 20 rises upward, and the hardened casting sand 50 moves from the mold box 20. It is to be separated.

5 is a cross-sectional perspective view of a mold manufactured by a mold forming apparatus according to the present invention and a tubular product molded from the mold, the same shape as that of the circle 1 for each predetermined position of the cured hexahedral casting sand 50. A molding space 50a having a shape is formed, and a spout 50b is formed at a predetermined position of the inner wall forming each of the molding spaces 50a and at the center of a portion surrounded by each of the molding spaces 50a. On the upper side of the spout 50b formed on the inner wall forming the space 50a, a water flow path 50c connected to the molding space 50a is formed. Meanwhile, after pouring the molten water into the respective molding spaces 50a. When the casting sand 50 is broken after cooling, it shows that the tubular product 70 of the form in which the flange part 70a of the predetermined length was extended to the outer side at the upper and lower edges is obtained.

FIG. 6 is a cross-sectional perspective view showing a tubular product molded from a mold manufactured according to the present invention to be used as a roller seal by being fitted to a rotating shaft of a track roller of a tracked vehicle. The roller seals 76, which are tubular products molded by the mold according to the present invention, are fitted in one pair at both ends of the coaxial 74, and the 'O' is used to increase the sealing effect on the outer circumference of the roller seals 76. 'The ring 78 is fitted, indicating that the collar (80) is fitted from the outside of the rotation shaft 74 in the state that the roller seal 76 is fitted in this way.

In such a coupled state, the 'O' ring 78 fitted on the roller seal 76 is prevented from being separated by the flange portion 70a extending outwardly at both ends of the roller seal 76, and the track roller ( The foreign matter such as dust introduced into the gap between the 72 and the collar 80 is not introduced into the rotation shaft 74 by the sealing function of the roller seal (72).

As described above, the casting prototype of a tubular article having radially outwardly extending ends according to the present invention is made of a flexible heat resistant rubber and thus is extended radially outwardly of its ends by its flexibility in the hardened casting sand. Since the flange part is easily pulled out without damaging the product forming space, it is possible to manufacture the mold as a mold box without using a mold set of several sets to make such a mold as in the prior art. It can withstand repeated use.

Accordingly, the mold forming apparatus according to the present invention can produce a mold capable of molding a plurality of products by arranging a plurality of circles in one mold box, and making a recess on the substrate of the mold box and forming a recess on the bottom plate surface of the lid. If you make the convex part and make the height of the mold forming projection of the mold box equal to the height of the wall of the mold box, a plurality of manufactured molds will be exactly aligned and stacked. Since the water is filled into the product molding space in the mold, very many products can be cast in one process.

In addition, unlike conventional molds for tubular products, since several identical molds are manufactured in one hardened molding sand, the product may be displaced, uneven, or eccentric due to inaccuracies in assembling as in conventional molds. It is effective to make a smooth product with accurate roundness without producing a finished product.

Claims (4)

An annular metal support ring 2 having an inner diameter of a predetermined size and a fastening portion 6 formed on the upper surface, and a screw hole 4 formed at a predetermined position on the lower surface thereof, and a fastening portion 6 on the support ring 2. Circular mold for forming a tubular product having a radially outwardly extending end portion consisting of a heat-resistant rubber (3) having a heat resistance and flexibility that is attached and bonded in the same shape as the desired cast product. A plurality of annular grooves 26 are arranged in a predetermined shape on the inner bottom surface formed by the substrate 21 and the square wall 22 so that the circular shape 1 is fixedly coupled to each of the annular grooves 26 and each of the annular grooves is fixed. The center of the (26) is formed through the push-hole 28, the center of the portion surrounded by the annular grooves (26) of the structure formed with a hot water-shaped projection (23) connected to each of the circular (1) Mold box 20 and: a heating wire 31 is embedded therein, the long hole 33 is formed at a position corresponding to the push hole 28 in the center of the annular groove 26 constituting the mold box 20 The bottom plate 30 for the heating of the structure, and a separate heating wire 14 therein, and the lid 10 of the structure in which the clasp 13 is formed at a predetermined position on the upper surface: each pusher hole on the mold box 20 ( 28) and the external drive water in the state in which the head 41 is expanded on the upper end through the respective long holes 33 on the bottom plate 30 for heating. Of the tubular product casting mold forming apparatus having a vertically reciprocating plunger 40, the end portion extends radially outwardly, characterized in that made up of by the action. According to claim 2, wherein the mold box 20 is formed in the concave portion 29 at two or more places of the inner bottom surface, the convex portion is formed at the position of the bottom surface of the corresponding lid 10, the annular Molding protrusions 23 between the grooves 26 are formed to be equal to the height of the wall 22 of the mold box 20. Device. 3. The apparatus of claim 2, wherein the long holes (33) of the base plate (30) are radially elongated.