JP2750730B2 - Molding equipment manufacturing method, heat-resistant hot-water-permeable sheet-like separator as much as mold equipment - Google Patents

Description

The present invention relates to a method for manufacturing a mold apparatus, a mold apparatus and a heat-resistant hot-water-permeable sheet-like separator.

[Conventional technology]

Conventionally, in a casting for casting composed of an upper mold and a lower mold, an upper mold and a lower mold are provided in order to install a heat-resistant porous sheet vertically traversing a runner formed between the opposed upper mold and the lower mold. Cut grooves for inserting the upper and lower sides of the sheet at positions facing each other, and insert the upper and lower sides of the sheet into the upper and lower grooves, and place the hot water in between. The mold apparatus was manufactured by setting it in a state of crossing the road, but at the time of the setting, the lower side surface of the sheet was inserted into a cut groove provided in the lower mold cutting surface, and the lower surface of the upper mold was It is extremely difficult to fit the upper side surface portion into the opposing incision provided in the above.

In order to solve this inconvenience, the applicant previously filed Japanese Patent Application No. 63-278475, provided a kerf in the model in advance and inserted a heat-resistant porous sheet into it, and from this state, After filling the casting space into the internal space and solidifying the whole, it is inverted, and the model is pulled out to form a product casting space open to the parting surface side and a concave runner connected to the space at the mark, A mold consisting of an upper mold or a lower mold which traverses the runner at a predetermined location at its center surface, and which has three sides of a lower side as well as both sides being embedded and fixed in the molding sand of the molding mold. It is proposed to manufacture the apparatus, and the above-mentioned complicated method of the manufacturing method of the mold apparatus in which kerfs are formed directly on the body surface of each of the upper and lower molds of the conventional mold and the porous sheet is inserted over these kerfs. I removed the taste.

[Problems to be solved by the invention]

In the manufacture of the mold apparatus of the porous sheet embedded type disclosed in the above-mentioned application, in order to make the porous sheet act as a separator, the porous sheet was embedded and fixed particularly at one end of the runner near the end face opening to the product casting space. When the product is manufactured, since the thickness of the molding sand between the porous sheet and the buried surface portion of the three sides and the space becomes thin, when casting, the molten metal is injected and filled into the space via a runner. , Due to the strength of the molten metal
The molding sand in this portion is easily broken by impact or vibration, and particularly when raw molding sand is used, it is very easily broken, and the production loss of a casting apparatus of a predetermined molding is large. In order to prevent this inconvenience as much as possible, as proposed in the previously filed Japanese Utility Model Application No. 63-139763, the applicant used a casting separator whose inclined sides were inclined on both sides. In the vicinity of one end of the runner's space for product casting, three sides are buried in the casting sand and set, and both sides of the separator are bent and inclined in a direction away from the space, and set. The molding sand wall between both side surface portions of the separator and the space is formed in a tapered thick portion to prevent collapse of the wall as much as possible.

However, when the casting apparatus is manufactured by burying the three sides of the upper or lower mold in the casting sand near the product casting space using the previously proposed porous sheet separator, the manufacturing process and the The following inconvenience may be caused when using the production mold apparatus.

That is, in the manufacturing process, as in the Figure 10 and 11 shown, the both sides is porous sheet separators A Insert in its central surface a ₁ in the groove C of the runner mold portion b ₁ of model B The surface portions a ₂ , a ₂ and the lower side surface portion a ₃ are connected to the respective runners b ₁ , b of the model B.
₁ is installed so as to protrude outward from both side surfaces and the upper surface, and then a casting frame D is installed surrounding the outer periphery thereof, and the inside thereof is filled with molding sand to the upper end of the casting frame D. The whole of the molding sand is solidified and formed (FIG. 11). Then, after inverting the molding sand, the model B is pulled out and opened to the parting surface side of the mold E as shown in FIG. 12 and FIG. concave runner G communicating products casting space and on both sides of the center to the sampling trace, the G is formed, the porous sheet separator a will cross the concave-shaped runner G at its central surface a _1, A mold apparatus H is manufactured by being buried and fixed in the molding sand on the bottom side of the concave runner G of the mold E at the three sides of the outer periphery a ₂ , a ₂ , a ₃ .
As the separator A, both side surface portions a ₂ , a ₂
Can be used to increase the thickness of the mold walls e ₁ , e ₁ on both sides between the respective side surfaces a ₂ , a ₂ and the space F for product casting. When the molten metal at the time of product production is injected and filled into the space F, the walls e ₁ , e ₁
Can be prevented, but the separator A
As shown in FIG. 10, when the model B is set on the model B, the lower side surface portion a ₃ is in a state of protruding above the runner type portion b _{1 of the} model B, and as shown in FIG. lower side surface portion a ₃ and thin wall portion e ₂ by molding sand that enters between the product casting mold section b ₂ of the model B is formed, in particular, when using raw molding sand is model subsequent in liable external force received in such withdrawal during liable brings damage the meat thin wall e _2, disintegration, and,
When switching glass-added molding sand is used, carbon dioxide used for hardening is hindered from flowing and diffusing carbon dioxide into the thin wall portion e ₂ by the protruding lower side surface portion a ₃ , sufficient curing of meat thin wall portion e ₂ is dislike not be obtained. As shown in FIG. 13, the mold apparatus H thus obtained has a bottom surface portion of an opening for flowing water into the product casting space F of each concave runner G, that is, a jaw portion. It is divided by the lower surface a ₃ of the separator a to its implantation, so that the thin wall portion e ₂ between the product casting space F and the lower side surface portion a ₃ are formed. Therefore, when casting a product using the mold apparatus, when the molten metal flows into the space F and is filled, the thin wall portions e ₂ , e ₂ are collapsed by the force of the flowing molten metal to form a predetermined shape. Cast products may not be obtained and production may be lost.

[Means for solving the problem]

The present invention provides a method of manufacturing a mold apparatus which is a further improvement of the above-mentioned proposed invention and invention. (A) A heat-resistant hot water supply is provided near one end of a runner mold part of a model near a cast product mold part. (B) as a heat-resistant hot-water-permeable sheet-like separator,
Its height is the same as the depth of the groove provided in the runner mold,
The width of the separator is prepared to be wider than the width of the runner section. (C) Inserting the groove provided in the runner section at the intermediate surface of the heat-resistant and water-permeable sheet-like separator. At the same time, only the both side surface portions are projected outward from both side surfaces of the runner mold portion, and further, the model is installed in a state of being inclined in a direction farther from the product mold portion of the model, (d) A casting frame is installed around the periphery of the model in which the heat-resistant hot-water-permeable sheet-like separator is set, and the inner space is filled with casting sand up to the upper end of the casting frame, and the entire filling sand is solidified,
(E) The method is characterized in that the cast sand compact obtained is turned over and the model located on the upper surface thereof is pulled out.

[Action]

As described above, as the heat-resistant hot-water-permeable sheet-like separator, the height is formed to be the same as the depth of the groove provided in the runner-type portion of the model, and the width is wider than the width of the runner-type portion. When the prepared material is prepared and inserted into the groove of the model, the separator is installed on the model without protruding outward from the upper surface of the runner mold portion. When filling the enclosed space with casting sand, a thick filling layer of casting sand is formed on the upper surface of the groove of the runner portion of the model.

After that, the entire filling sand is consolidated, and after the obtained molding sand is turned over, if the model frame is pulled out, a product casting of a predetermined shape with an upper surface, that is, a parting surface is opened at the trace of the pulled out frame. A space and a concave runner communicating with it are formed,
A sheet having an intermediate surface traversing the entire cross-section of the concave runner and having both side surfaces at the same height as the depth of the concave runner and rushing into the casting sand on both sides of the runner, i.e., the weir. A mold device equipped with a separator is obtained. Since the both side surfaces are gradually inclined backward with respect to the front opening end surface of the runner, a tapered thick mold is provided between the product casting space and the inclined both side surfaces. A wall is formed.
Therefore, this portion is prevented from being broken or collapsed due to the flow of the molten metal at the time of casting product production. According to the present invention, in addition to this, the jaw on the lower surface of the runner does not have a thin wall due to the embedding of the lower side surface of the separator as in the prior art, so that it is cast on a robust jaw. Therefore, the conventional problem of collapse of the thin wall portion is prevented, the collapse of the jaw portion is prevented, and stable production of a cast product having a predetermined shape and good stability is obtained.

〔Example〕

 Next, examples of the present invention will be described.

FIGS. 1 to 9 show a method 1 for manufacturing a mold apparatus according to the present invention.
Here is an example. In the drawings, reference numeral 1 denotes a model having a predetermined shape. The model 1
The material is arbitrary, such as wooden, metal, ceramic, and plastic. In the following embodiments, an example using a wooden casting model will be described, so the description will be made using only the term “wooden pattern”. The wooden mold 1 comprises a cast product mold part 1a, runner mold parts 1b, 1b having a rectangular cross section extending horizontally on both sides thereof, and base mold parts 1c, 1c on the gate side and the feeder side. The wooden mold 1 is fixed to the surface of the platen 2 having a flat surface with an adhesive, and each runner mold portion 1b
The runner mold portion 1b is bisected in the vicinity of the product mold portion 1a at one end, and the heat-resistant hot water-permeable sheet-like separator insertion groove 3 reaching the surface of the platen 2 is cut and formed. It goes without saying that the groove 3 may be formed in advance by fixing a part bisected at a predetermined location to the surface of the surface plate 2 with a predetermined groove width.

On the other hand, as shown in FIG. 2, as a separator 4 formed of a heat-resistant fiber made of high silicate glass fiber or the like and formed into a porous heat-resistant hot-water-permeable sheet such as a net, the height of the separator 4 is set as shown in FIG. The height of the runner portion 1b is the same as that of the runner portion 1b, and the depth of the groove 3 provided in the runner portion 1b is the same as that of the runner portion 1b. This is inserted into the groove 3 of the wooden mold 1 as shown in FIG.
To make the both side surface portions 4b, 4b protrude outwardly from both side surfaces of the runner mold portion 1b, and the cast product mold portion 1a
Bend it to the farther direction and install it at an angle. As shown in FIGS. 2 (A) and 2 (B), the separator 4 has its both side surfaces 4b, 4b bent at a predetermined angle with respect to its intermediate surface 4a before being inserted into the groove 3. Alternatively, it is bent after being inserted into the groove 3. The bending direction of the side surface portions 4b, 4b is a direction away from the product mold portion 1a of the wooden mold 1. The angle of inclination is, for example,
45 ° to the 4a plane. The outer ends of the inclined side surfaces 4b, 4b may be stably contacted by engaging pins 2a, 2a protruding from the upper surface of the surface plate 2.

Next, a casting frame 5 is provided around the outer periphery of the wooden mold 1 with a space for filling the casting sand therein, and the space is filled with the casting sand until the upper surface of the casting frame 5 becomes the same plane. In this state, the whole is solidified to obtain a cast sand molded body 7 (FIG. 4). As the molding sand, an arbitrary molding sand, a molding sand mixed with water glass hardened by carbon dioxide gas, a hardening furan molding sand, and the like are used. As clearly shown in FIG. 4, the casting sand forms a thick filling layer of the casting sand uniformly up to the upper surface of the groove 3 of the wooden mold 1. In other words, according to the previously proposed separator, since the lower side surface portion protrudes above the groove, the filling layer is divided, and the thin wall portion is provided between the lower side surface portion and the wooden mold product mold portion. Is eliminated, and the outer peripheral surface of the product mold portion 1a has a cast body 7 composed of a uniform packed layer.
Is formed.

Therefore, when the molding sand is hardened by carbon dioxide gas, the carbon dioxide gas is uniformly circulated and diffused in the filling molding sand, and the molding sand on the outer periphery of the product mold is uniformly hardened, and the molding wall collapses. Thus, a cast sand molded body 7 having a high-quality space for a casting product without any defects can be obtained.

Next, the molding body 7 is turned over and the wooden mold 1 positioned on the upper surface is pulled out. Even when the external force due to the drawing is received, the peripheral wall of the molded body is not broken or collapsed, and the mold device 8 having a product space of a predetermined shape can be obtained. FIG. 5, FIG. 6, and FIG. 7 show the mold apparatus 8 thus obtained. That is, when the wooden mold 1 is pulled out, the molding 7
In the example shown in the drawing, the product casting space 8a has a substantially truncated cone shape and is open to the upper surface thereof, and concave runners 8b, 8b on both sides communicating with the opening are formed. Near the open end face of the road 8b which is continuous with the product casting space 8a, the runner 8b,
That is, the intermediate surface portion 4a traversing the entire cross section of the concave space and the runner 8b
, Ie, h equal to the height of the weir, the inclined side surfaces 4b, 4b on both sides buried in the molding sand of the molding sand 7 on both sides thereof.
Thus, a mold provided with the separator 4 consisting of the above, that is, a mold device 8 is obtained.

That is, according to the manufacturing method of the mold apparatus of the present invention, the inclined side surfaces 4b, 4b on both sides of the separator 4 are formed on the concave runner 8b communicating with the product casting space 8a, as shown in FIG. Mold wall surface 7 extending to both sides of the open end face and regulating the space 8a
a, 7a gradually moving away from it, and in the meantime, it is advantageous to form the tapered mold wall portions 9, 9 of increased thickness in thickness, which is advantageous, as compared with the mold device of Japanese Utility Model Application No. 63-139763 proposed earlier. In addition to providing the same configuration and effect, according to the present invention, as shown in FIGS. 5 and 7, both runners 8b, 8b
In the bottom wall near the end face on the side communicating with the space 8a, that is, in the `` chins '' portions 7b, 7b, the rush burial of the lower side surface portion as previously proposed was eliminated, so the peripheral wall of the space 8a Strength increases. That is, the lower side surface portion of the separator proposed earlier does not protrude downward into the bottom wall of the runner 8b, 8b, that is, the `` chin, '' without forming a thin wall portion between the lower side surface portion and the space 8a.
Therefore, the problem of collapse, which will be described later, can be solved.
Therefore, the mold apparatus S manufactured in this manner is used as a lower mold or an upper mold, and an upper mold or a lower mold separately manufactured facing the mold apparatus S is stacked to form a casting having a predetermined shape.

In FIG. 8, the mold device 8 is a lower mold, and a product casting space 9a, a sprue system runner 9b, and a feeder system runner 9c are formed in the vertically extending center separately manufactured on the upper surface thereof. A mold 10 comprising an upper mold 9 is shown. In this case, when the upper mold 9 is placed on the lower mold 8, the open upper surfaces of the concave runners 8 b, 8 b are closed by the lower surface of the upper mold 9 and surrounded by a rectangular mold wall having a rectangular cross section. Is formed, but the upper edge of the intermediate surface portion 8a crossing the runner 8b of the separator 4 abuts on the lower surface of the upper mold 9, and the runner is completely traversed by the intermediate surface portion 8a of the separator 4. I'm sullen. The lower mold space 8a is connected to the upper mold space 9a.
As a result, a space S for casting the product having a predetermined shape is formed. Using the mold 10, in accordance with a conventional method, a molten metal obtained by heating and melting a metal is injected from the gate system runner 9a, and is filled into the upper and lower united product casting spaces 9a, 9a via the runner 8b. Then, the casting is completed by cooling and solidifying the molten metal to complete casting, and the upper and lower molds are broken to take out a casting P.

Casting P taken out from the template 10 is comprised of a single piece of cast product p ₁ as the ninth shown and both sides of the runner system solidified portion p _2, p _2, and its products p ₁ on both sides thereof the intermediate surface portion 4a of the separator 4 over its cross-section the entire surface between the runner freezing unit p _2, p ₂ is intervened, if you hit the該湯canal coagulation part p _2, p ₂ side with a hammer , the intermediate surface portion is divided along the 4a, so that coagulation of the surplus product p ₁ does not remain mostly obtained, the surface treatment of the subsequent product is facilitated.

As the heat-resistant hot-water-permeable sheet separator, a protective sheet that can be removed by flammability or melting of the molten metal is attached to one side thereof in the same manner as previously proposed, and both sides are reinforced with reinforcing plates. Things can also be used.

〔The invention's effect〕

As described above, according to the present invention, the runner mold portion of the model has the same height as the depth of the groove in the groove provided near the casting product mold portion of the runner mold portion of the model. A heat-resistant hot-water-permeable separator having a width wider than the width of the cast product is inserted at the intermediate surface and both side surfaces protruding outward from the groove are inclined with respect to the cast product mold portion. Since it was installed, it brought a mold with a strong jaw part at the time of molding, using the manufactured mold apparatus as an upper mold or a lower mold, preventing collapse of the jaw part due to pouring, and modeling the separator proposed earlier In the case of using a mold device manufactured by inserting the central surface part into the groove of the mold, and projecting the three sides of the outer periphery not only on both sides of the model but also upward and installing it on the model To solve the problem of the collapse of the thin wall of the jaw, It has the effect of such may improve the smooth production of the cast product in the mold parallel.

[Brief description of the drawings]

1 to 8 show an example of a method for manufacturing a casting apparatus according to the present invention. FIG. 1 is a side view of a cut wooden model, and FIGS. 2 (A) and 2 (B) show a method according to the present invention. FIG. 3 is a perspective view of a model in which the separator is installed, FIG. 4 is a cut side view of a molded body in a casting sand filling step, and FIG. FIG. 6 is a cutaway side view of the mold apparatus obtained by removing the model, FIG. 6 is a plan view of the mold apparatus shown in FIG.
FIG. 7 is a sectional view taken along the line VII-VII of FIG. 6, FIG. 8 is a sectional view of a mold using the mold apparatus as a lower mold, and is overlapped with an upper mold, and FIG. Slope views, FIGS. 10 to 13 show an example of a method of manufacturing a mold apparatus using the previously proposed separator, and FIG. 10 is a slope view in a state where the separator is installed on a model. FIG. 11 is a cut side view of the molded mold in the casting sand filling step, FIG. 12 is a plan view of the mold apparatus shown in FIG. 11, and FIG. 13 is a sectional view taken along line XII-XII of FIG. Show. DESCRIPTION OF SYMBOLS 1 ... Model, wooden mold, 1a ... Mold part for casting products 1b ... Runner mold part, 2 ... Flat plate, surface plate 3 ... Groove, 4 ... Heat-resistant hot water-permeable separator 4a ... Middle surface part, 4b, 4b: inclined side surface 6: cast frame 7, molding sand 7b: jaw 8, molding device 8a: product casting space 8b: runner 9, upper Type

Claims (3)

(57) [Claims] (A) placing a heat-transferable sheet-like separator in a groove near a cast product mold portion at one end of a runner mold portion of a model; As the heat-resistant hot-water-permeable sheet-like separator, a separator having a height the same as the depth of the groove provided in the runner mold portion and a width larger than the width of the runner mold portion is prepared. (C) The heat-resistant hot-water-permeable sheet-shaped separator is inserted into the groove provided in the runner-shaped portion at an intermediate surface portion thereof, and only the both side surface portions thereof are located outward from both side surfaces of the runner-shaped portion. (D) Surrounding the outer periphery of the model on which the heat-resistant hot-water-permeable sheet-like separator is set as described above. A casting flask is set up and the interior space is filled with casting sand up to the upper end of the casting flask. (E) inverting the obtained cast sand molded body and pulling out the model located on the upper surface thereof, and a method for manufacturing a mold apparatus used as a lower mold or an upper mold. 2. A mold comprising an upper mold and a lower mold having a product casting space opened to the parting surface and a concave runner communicating with the space, and at least one of an upper mold and a lower mold. Then, the heat-resistant hot-water-permeable sheet-like separator is traversed across the entire cross-section of the concave runner at an intermediate surface thereof at one end of the concave runner near an opening end surface opening into the casting product casting space, Only both side surfaces having the same height as the weir of the runner are buried and fixed in the casting sand portions on both sides of the runner, and are provided so as to be inclined in a direction away from the front open end surface of the runner. Mold equipment. 3. The height of the groove is equal to the depth of the groove formed in the runner of the model, the width is wider than the width of the runner, and is inclined at a desired angle with respect to the intermediate surface or after. A heat-resistant hot-water-permeable sheet-like separator having both side surface portions inclined.