JPH0128937Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a support device for a tube member used in a forced cooling casting method for accurately supporting a tube member in a predetermined position.

[Conventional technology]

In order to produce reliable aluminum alloy castings free from casting defects, such as cylinder heads, it is desirable that the molten metal solidify rapidly and that the molten metal solidify directionally. Conventionally, mainly in gravity casting methods and low-pressure casting methods, solidification of molten metal has been promoted by cooling the mold with water or air. However, in this case, it is necessary to adjust the mold temperature relatively strictly to prevent poor flow during pouring due to overcooling of the mold, but the mold temperature fluctuates periodically with the casting cycle. Therefore, relatively sophisticated control technology is required to control the temperature of the mold. Furthermore, since a cooling means is incorporated into the mold, the mold structure becomes complicated and the cost of the mold increases.

In addition, in order to eliminate casting defects, the installation location, shape, capacity, etc. of the feeder are selected and set empirically in order to perform directional solidification. but,
Due to the shape constraints of the casting, there are limits to the selection and setting of the installation location, shape, capacity, etc. of the feeder, and it is often impossible to achieve good directional solidification using the feeder alone.

Furthermore, in the conventional method, the solidification rate of the molten metal is slow;
The mechanical strength of the obtained casting is poor.

Therefore, the present applicant proposed a direct cooling method for casting, which promotes directional solidification by providing an extra wall in the casting during casting and forcing the extra wall to cool. Public bulletin). This direct cooling casting method has the advantageous effects of promoting directional solidification, improving the quality of the casting, and shortening the casting cycle.

In addition, the applicant proposed a forced cooling casting method in which a pipe member is placed in the cavity of a mold and a cooling medium is passed through the pipe member to forcibly cool the molten metal and accelerate solidification (Japanese Patent Application Laid-Open No. 58-86966 Publication No.). This forced cooling casting method has the excellent effects of increasing the solidification rate of the molten metal, improving the mechanical strength of the resulting casting, and shortening the casting cycle.

However, in the above direct cooling casting method,
Since extra thickness is provided in the casting for forced cooling, there are problems in that the yield of the casting is poor and it takes time to remove the extra thickness after casting.

Further, in the above-mentioned forced cooling casting method, when casting large parts such as cylinder heads, there is a problem that sufficient directional solidification cannot be achieved depending on the shape.

Therefore, in order to solve the above-mentioned problem, the present applicant has developed a forced cooling method that utilizes the conventionally often used chiller for directional solidification, and also uses a forced cooling method to forcefully cool the pipe member that is surrounded by the molten metal. A casting method was proposed (unknown).

[Problem that the invention attempts to solve]

By the way, in the above two forced cooling casting methods, a pipe member is used to pass the cooling medium. If this tube member is not precisely positioned at a predetermined position within the mold, problems such as cooling medium leakage are likely to occur. For this reason, there has been a desire for a device to quickly and accurately support the tube member within the mold.

[Means for solving problems]

According to the present invention, such a desire is achieved by a support device for a tube member in a forced cooling casting method, which will be described below.

That is, the support device for the tube member in the forced cooling casting method of the present invention is a forced cooling method in which the tube member is inserted into the cavity defined by the mold and the molten metal is directly cooled by flowing a cooling medium into the tube member. A support device for a tube member used in a casting method, which includes a pedestal for receiving the lower end of the tube member, and a biasing means for pressing and supporting the upper end of the tube member, the biasing device having a distal end. A cooling nozzle that is thinner in diameter than the pipe member, has a main body that is approximately the same in diameter as the pipe member, and has a flange part in the middle; a sleeve in which the cooling nozzle can freely slide; and a cooling nozzle that is attached to the sleeve. A compression spring is inserted between the case and the flange of the cooling nozzle.

[Effect]

According to the support device for a pipe member in the forced cooling casting method of the present invention, a mold is first installed on the surface plate body, and then the pipe member is inserted through holes provided in the mold and the surface plate body, and then The lower end is positioned by coming into contact with the pedestal of the tube member provided below the board body. Next, the cooling plate body is lowered from above. A biasing means for the tube member is attached to this cooling plate body, and when the cooling plate body is lowered, the tip of the cooling nozzle is inserted into the tube member, and the tip of the cooling nozzle is inserted a certain distance into the tube member. , the cooling nozzle no longer descends, and the cooling plate body further descends slightly. In this state, the spring becomes more compressed and constantly urges the tip of the cooling nozzle toward the pipe member. As a result, the fitting between the cooling nozzle and the pipe member becomes strong, and the cooling medium guided to the cooling nozzle is supplied to the pipe member without leaking on the way. The cooling medium supplied to the pipe member flows downward while cooling the molten metal on the way, and flows out from the lower end of the pipe member. This cooling medium collides with the side of the pedestal and scatters to the side.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

Here, FIG. 1 is a sectional view showing a support device for a pipe member in the forced cooling casting method according to an embodiment of the present invention, and FIG. 2 is a sectional view showing a mold matching structure of a frameless sand mold used in an embodiment of the main body. Figure 3 is a sectional view taken along the - line in Figure 2, Figure 4 is a plan view of the surface plate used in the embodiment of the present invention, and Figure 5 is the installation of the mold and surface plate according to the embodiment of the present invention. FIG. 6 is a cross-sectional view showing the mounting state of the mold and surface plate according to the embodiment of the present invention, and FIGS. 7 and 8 are the cooling plate main body and fixed plate according to the embodiment of the present invention, respectively. 9 to 11 are cross-sectional views showing the insertion abnormality detection means of the cooling nozzle used in the embodiment of the present invention, and FIG. 9 shows the normal case. , FIGS. 10 and 11 show abnormal cases.

In FIG. 2, reference numeral 1 denotes a rectangular flat surface plate body, and three positioning pins 2, 3, 3 are erected and fixed on this surface plate body 1. As shown in Fig. 4, these three positioning pins 2, 3, and 3 are provided at positions corresponding to each vertex of an imaginary isosceles triangle arbitrarily formed on the surface plate body 1, and the two equilateral sides intersect. The positioning pin at the apex is a round pin 2 with a circular cross-section, and the other two positioning pins are square pins 3 with a rectangular cross-section.
It is said to be 3. And each positioning pin 2,
A mold leveling pedestal 4 for positioning the mold in the waterside direction is provided at the lower part of the molds 3 and 3. Note that the round pin 2 and the square pin 3 each have a conical or pyramidal shape, with the diameter becoming smaller toward the tip.

In addition, near the longitudinal end of the surface plate main body 1,
A pair of guide pins 5 are attached. Further, the surface plate body 1 is provided with holes for attaching a chiller and a pipe member in order to forcibly cool the molten metal. In this embodiment, as shown in FIG. 4, five chiller holes 6 and five tube member holes 7 were provided. In addition, in FIG. 2, a chiller 8 is fitted into the chiller hole 6.

A sand mold 9 as a mold is inserted into the positioning pins 2, 3, 3 of this surface plate main body 1, and the positioning and
Type matching is performed. This sand mold 9 consists of an upper mold 9a and a lower mold 9b, and the upper mold 9a and the lower mold 9b include
Positioning pin holes 10 are provided at positions corresponding to the positioning pins 2, 3, and 3, respectively. The hole for the round pin 2 in the positioning pin hole 10 is approximately the same size as the round pin, and the hole corresponding to the square pin 3 has the same length as the square pin 3 in the transverse direction of the surface plate body 1, and The direction of the cross section is a substantially elongated hole that is longer than the square pin 3. Moreover, the sand mold 9 is provided with a tube member hole 11 for inserting a tube member therethrough. This tube member hole 11 has a tube member 1
2 is inserted. The lower end of this tube member 12 is supported by a pedestal 13 having a triangular cross section attached to the surface plate main body 1 at a portion corresponding to the ridgeline thereof.

At a position facing the surface plate body 1, as shown in FIG. 1, a cooling plate body 14 is provided so as to be movable forward and backward (up and down) with respect to the surface plate body 1 by a driving means (not shown). This cooling plate body 1
4 is provided with a guide bush 15 at a position corresponding to the guide pin 5 on the surface plate main body 1 side. Further, a hole 17 for passing the tube member 12 is provided at a position corresponding to the hole 11 for the tube member in the sand mold 9. Cooling plate body 1 corresponding to this hole 17
A cooling nozzle sleeve 18 is attached to the upper side of the cooling nozzle 4, and a protective case 19 is attached to the upper part of this sleeve 18 for setting a spring and supporting and guiding the upper part of the cooling nozzle body. The cooling nozzle 16 is slidably inserted into the sleeve 18. This cooling nozzle 16
is connected to a conduit 20 for conducting a cooling medium. The cooling nozzle body has a flange portion 16a near the center, and a compression spring 21 is inserted between the flange portion 16a and the protective case 19 on the outer periphery of the cooling nozzle 16. The tip of the cooling nozzle 16 has a conical shape, and the diameter of the main body 16b of the cooling nozzle 16 is approximately the same as the diameter of the tube member 12.
Therefore, when the tip 16c of the cooling nozzle 16 is inserted into the tube member 12, the tube member 12 and the cooling nozzle 16 come into contact with each other with the tip 16c completely inserted.

Further, on the upper surface of the cooling plate main body 14, near the cooling nozzle urging means, there is provided an insertion abnormality detection means for the cooling nozzle 16. As shown in FIG. 9, this cooling nozzle insertion abnormality detection means includes an object to be detected 22 attached to a conduit 20 above a protective case 19, an antenna 24 held by a spring 23, and an antenna 24 placed in a predetermined position. and a bracket 25 mounted on the cooling plate body 14 for supporting it in position. Detected object 2
2 has an annular groove 26 formed approximately at the center in the axial direction, and the tip of the antenna 24 is inserted into this annular groove 26. Then, the antenna 24 is connected to the annular groove 26.
If you touch the wall above or below (10th
(see Fig. 11) is detected as an abnormality, and a case where no touch (see Fig. 9) is detected as normal. The result of this judgment is transmitted as an electrical signal to a buzzer or lamp (not shown) and displayed. Additionally, if an abnormality is detected, an automatic stop mechanism is activated.

Next, a method for assembling the sand mold used in the forced cooling casting method will be explained.

First, the surface plate main body 1 shown in FIG. 4 is prepared and placed substantially horizontally with the positioning pins 2, 3, and 3 facing upward. Next, the chiller 8 is inserted into the chiller hole 6 with its head facing the positioning pins 2, 3, and 3.
Next, as shown in FIG. 5, after aligning the positioning pins 2, 3, 3 of the surface plate body 1 with the positioning pin holes 10 of the lower mold 9b, gently move the lower mold 9b with the positioning pins 2, 3, 3, 3. Then, the lower mold 9b is pushed in until it comes into contact with the mold leveling pedestal 4. Subsequently, similarly, the upper die 9a is attached to the positioning pins 2,
3, 3 and match the molds. As a result,
As shown in FIG. 6, the upper mold 9a and the lower mold 9b are guided by the positioning pins 2, 3, and 3 and are housed in a predetermined position, so that the upper mold 9a and the lower mold 9b are accurately positioned.

Next, as shown in FIG. 2, the tube member 1 is inserted through the tube member hole 11 and the tube member hole 7 from above.
2, and place the lower end of the tube member 12 on the pedestal 13 (third
(see figure). As a result, the lower end of the tube member 12 is positioned.

Subsequently, the cooling plate main body 14 is lowered.
Then, as shown in FIGS. 7 and 8, the guide bush 15 first engages with the guide pin 5 attached to the surface plate body 1, and the cooling plate body 14 and the surface plate body 1 are positioned. Then, by continuing to descend, the tube member 12 is guided into the hole 17 provided in the cooling plate body 14, and the upper end of the tube member 12 is positioned. after that,
A tip of a cooling nozzle 16 slidably held within a sleeve 18 attached to the cooling plate body 14 is inserted into this tube member 12 . When pushed a certain distance, the cooling nozzle 16
The compression spring 21 is compressed by contacting the spring 2 and then continuing to descend. Therefore, when the surface plate main body 1 and the cooling plate main body 14 are completely positioned, as shown in FIG.
The cooling nozzle 16 is brought into close contact with the compressed spring 21 by the biasing force of the compression spring 21.

In addition, in the final state where the surface plate body 1 and the cooling plate body 14 are in contact, if the antenna 24 is not in contact with the detected object 22 as shown in FIG. indicates that the position has been determined. On the other hand, as shown in FIGS. 10 and 11, when the antenna 24 comes into contact with the upper surface of the annular groove of the detected object 22, it means that the tube member 12 and the cooling nozzle 16 are not in contact with each other, or the tube member 12 is not set and the antenna 24 comes into contact with the lower surface of the annular groove of the object to be detected 22, the contact between the tube member 12 and the cooling nozzle 16 is insufficient, and the tube member 12 etc. may become clogged. Indicates that this is occurring. In such a case, a buzzer or lamp (not shown) will notify you of the abnormality, and an automatic stop mechanism will be activated.

As described above, according to the pipe member support device in the forced cooling casting method of this embodiment, the simple operation of aligning the surface plate body 1 and the cooling plate body 14 can
Accurate positioning of the tube member 12 can be performed automatically.

Further, it is possible to easily know whether or not the fitting between the pipe member 12 and the cooling nozzle 16 has been performed correctly.

Although a specific embodiment of the present invention has been described above, the present invention is not limited to this embodiment, and includes various embodiments within the scope of the claims for utility model registration. It is.

For example, in the embodiment, a sand mold is used as the mold, but a metal mold may also be used.

[Effect of idea]

From the above, according to the support device for pipe members in the forced cooling casting method of the present invention, the accurate positioning of the pipe member can be automatically performed by the simple operation of aligning the surface plate body and the cooling plate body. It has excellent effects.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing a support device for a pipe member in the forced cooling casting method according to an embodiment of the present invention; Fig. 2 is a sectional view showing a mold matching structure of a frameless sand mold used in an embodiment of the main body; Figure 3 is a cross-sectional view taken along the - line in Figure 2, Figure 4 is a plan view of the surface plate used in the embodiment of the present invention, and Figure 5 shows the method of attaching the mold and surface plate according to the embodiment of the present invention. Cross-sectional view, FIG. 6 is a cross-sectional view showing the installation state of the mold and surface plate according to the embodiment of the present invention,
Figures 7 and 8 are cross-sectional views showing the fitting process of the cooling plate body and surface plate body according to the embodiment of the present invention, respectively, and Figures 9 to 11 are respectively the cooling plates used in the embodiment of the present invention. FIG. 9 is a front view showing a nozzle insertion abnormality detection means, with FIG. 9 showing a normal case and FIGS. 10 and 11 showing an abnormal case. 1...Surface plate body, 2...Round pin (locating pin), 3...Square pin (locating pin), 4...Mold leveling pedestal, 5...Guide pin, 6...Cold metal hole, 7... Hole for pipe member, 8... Cold metal, 9...
Sand mold (mold), 9a...upper mold, 9b...lower mold, 1
0...Positioning pin hole, 11...Pipe member hole, 1
2... Pipe member, 13... pedestal, 14... cooling plate body, 15... guide bush, 16... cooling nozzle, 17... hole, 18... sleeve, 19
... Protective case, 20 ... Conduit, 21 ... Compression spring, 22 ... Object to be detected, 23 ... Spring, 24 ... Antenna, 25 ... Bracket, 2
6...Annular groove.

Claims (1)

[Claims for Utility Model Registration] Support for a pipe member used in forced cooling casting method in which the pipe member is inserted into a cavity defined by a mold and a cooling medium is flowed through the pipe member to directly cool the molten metal. The apparatus includes a pedestal for receiving the lower end of the tube member, and a biasing means for pressing and supporting the upper end of the tube member, the biasing means having a tip that is thinner than the diameter of the tube member and a main body. The cooling nozzle has a diameter substantially the same as that of the pipe member and has a flange part in the middle, a sleeve in which the cooling nozzle can freely slide, and a case attached to the sleeve. A support device for a pipe member in a forced cooling casting method, characterized in that a compression spring is inserted between a case and a flange portion of a cooling nozzle.