JP7382619B2 - Casting mold manufacturing equipment - Google Patents

Description

The present invention relates to an apparatus for manufacturing molds such as main molds and cores for casting cast articles made of aluminum, cast iron, etc.

As shown in FIG. 6, as an example of a casting mold manufacturing apparatus, and as shown in Patent Document 1 below, a fixed block 1 and a movable block 2 that can freely move toward and away from the fixed block 1 are used. A mold 5 is fixed to each opposing surface via a mold support frame 3 and a mold mounting plate 4, and a large number of gas supply nozzles are installed in the gas combustion chamber 20 in each mold support frame 3 in front thereof. There is one equipped with a burner plate 7 having burner plates 7 attached in a dotted manner.

When manufacturing a mold, the gas supply nozzles 6 are ignited to heat the molds 5, 5, and both molds 5, 5 are moved along the arrows and imaginary lines in FIG. As shown, they are connected to each other by a cylinder device 2A, mold sand is filled into the molds 5, 5, and the mold sand is fired into a predetermined mold shape.

By the way, the casting die 5 has a thick wall portion 5a and a thin wall portion 5b corresponding to the desired mold shape, so if the entire casting die 5 is heated evenly, the thick wall portion 5a will be thicker than the thick wall portion 5a. Also, the thin wall portion 5b becomes hotter, and the sand in contact with the thin wall portion 5b is excessively burnt.

Therefore, conventionally, as shown in Patent Document 1 and as shown in FIG. 7, an ignition coupler 8 has been proposed. That is, an on-off valve body 11 having a gas passage 10 is screwed into a plurality of nozzle attachment holes 9 provided at predetermined intervals on the burner plate 7, and a spring 12 is attached to the inside of the on-off valve body 11. An on-off valve 13 is provided which closes the gas passage 10 by being energized, and an engagement ball 18 is fitted into the tip of the on-off valve main body 11.

A slider 15 is provided on the outer periphery tip side of the on-off valve body 11, and is normally located on the tip side biased by the spring 14, with a protrusion 17 on the inner periphery side. It is in contact with the engagement ball 18.

Then, while the slider 15 is manually moved against the biasing force of the spring 14 so that the engagement ball 18 is recessed into the recess 15a on the inner peripheral surface of the tip end of the slider 15, the gas supply nozzle is moved. By fitting the ignition coupler 8 consisting of a plug 16 with a protruding plug 16 into the opening/closing valve body 11 and then releasing the slider 15, the slider 15 is biased by the spring 14 and returns to its original position. The engagement ball 18 is pushed by the protrusion 17 protruding from the slider 15 and engages with the engagement groove 19 provided on the outer circumferential surface of the plug 16 of the ignition coupler 8, thereby causing gas supply. An ignition coupler 8 consisting of a plug 16 to which a nozzle 6 is attached in a protruding manner is attached to an on-off valve body 11.

Therefore, as shown in FIG. 8, an ignition coupler 8 consisting of a plug 16 to which a gas supply nozzle 6 is attached is attached to the nozzle attachment hole 6 facing the thick walled part 5a of the casting mold 5. Combustion gas is ejected from the gas supply nozzle 6 of the coupler 8 and heats the thick wall portion 5a. By not attaching the ignition coupler 8 to the opening/closing valve 11, the opening/closing valve 13 in the opening/closing valve main body 11 is biased by the spring 12 to close the gas passage 10, and the combustion gas is not directly supplied to the thin wall portion 5b. It doesn't hit and I keep the heating level low.

By the way, in the conventional structure shown in Patent Document 1, as shown in FIG. Since it includes a slider 15 for attaching and detaching the slider 15 and a spring 14 for biasing the slider, it is necessary to operate the slider 15 which is troublesome to attach and detach the ignition coupler 8 to and from the valve body 11. In particular, the slider 15 is biased. The spring 14 is provided near the gas supply nozzle 6 and is exposed to the high temperature of the combustion gas ejected from the nozzle 6, which causes the spring 14 to oxidize and corrode in a short period of time. Since the protruding width of the gas supply nozzle 6 that is attached to the ignition coupler 8 in a protruding state is large, the width L1 of the gas combustion chamber 20 for heating the casting mold 5 becomes larger than necessary, and this has an effect. Therefore, the mounting position of the casting mold 5 protrudes beyond necessity, resulting in a fatal disadvantage that the overall size of the apparatus cannot be avoided.

In order to improve this, as shown in Patent Document 2 and as shown in FIG. The nozzle mounting hole 9 provided on the entire surface of the nozzle plate 24 is formed with a female thread 9a, and is formed separately from the nozzle plate 24 to be mounted. Then, the male thread 25a of the gas supply nozzle 25 shown in FIG. 10 is screwed into the female thread 9a of the nozzle mounting hole 9 into the nozzle mounting hole 9 facing the thick part 5a, and the nozzle mounting hole 9 facing the thin wall part 5b is inserted into the nozzle mounting hole 9 facing the thin wall part 5b. In this case, the embolus 26 shown in FIG. 11 is attached by screwing its male thread 26a into the female thread 9a of the nozzle attachment hole 9.

A large number of nozzle plates 24 to which gas supply nozzles 25 and plugs 26 are screwed in a desired arrangement corresponding to the arrangement shape of the thick-walled part 5a and thin-walled part 5b of the casting mold are prepared in advance. When replacing the mold 5 with another mold 5 having a different internal shape, remove the nozzle plate 24 of the burner plate 21 that has been used until then from the plate body 23, and replace the above-mentioned another mold in the plate body 23. The nozzle plate 24 to which the gas supply nozzle 25 and the embolus 26 are attached is replaced and attached in a desired arrangement corresponding to the internal shape of the mold 5.

With this structure, the gas can be removed by a troublesome screwing operation in which the male thread 25a of the gas supply nozzle 25 shown in FIG. 10 and the male thread 26a of the embolus 26 shown in FIG. It is necessary to manufacture and prepare in advance a large number of different burner plates 24 with different arrangement states of supply nozzles 25 and embolizations 26, and there is a fatal drawback that it is impossible to eliminate the troublesome screwing operation. Ta.

Jitsuhei No. 2-14830 Japanese Patent Publication No. 10-58088

The present invention has a burner plate divided into a plate main body and a nozzle plate, and a joint with a gas supply nozzle that supplies gas by opening a gas passage to the nozzle plate, and a joint with a gas supply nozzle that supplies gas by blocking the gas passage. It is an object of the present invention to provide a casting mold manufacturing apparatus that allows a closing plug to be easily and quickly attached to prevent the casting from occurring.

As shown in FIG. 1, the casting mold manufacturing apparatus according to claim 1 includes a casting mold 5 fixed to each opposing surface of a pair of mold support frames 3 that are relatively movable toward and away from each other. 5, a hollow burner plate 27 is provided on the back side of each of the hollow burner plates 27, and the hollow burner plate 27 has a gap between the plate body 29 where the gas inlet 28 is provided and the opposing surface of this plate body 29. In a casting mold manufacturing device comprising a nozzle plate 31 provided on both sides of a gas circulation cavity 30,
A large number of socket mounting holes 32 are formed through the entire surface of the nozzle plate 31, and as shown in FIG. A joint 36 equipped with a gas supply nozzle 35 that communicates with the gas passage 33 or a gas cutoff plug 38 provided with a cutoff wall 37 that blocks the gas passage 33 is attached to the gas cutoff plug 38 via a mounting means 39.
The socket 34 includes a small-diameter portion 34a that is press-fitted into the socket mounting hole 32 of the nozzle plate 31, and a small-diameter portion 34a that extends from the small-diameter portion 34a and has the gas flow between the opposing surfaces of the plate body 29 and the nozzle plate 31. It consists of a large diameter portion 34b located in the space 30,
The end portion 48 on the side of the large diameter portion 34b is formed in a bottomed shape, and a gas inlet 49 is provided at the center of the end portion 48 to receive the gas flowing into the gas circulation cavity portion 30. ,
The attachment means 39 includes :
a hollow cylindrical body part 41 that is provided on the joint 36 and the gas cutoff plug 38 facing the gas passage 33 of the socket 34 and has a hollow part 43 formed therein ;
The joint 36 and the gas cutoff are engaged with the engagement hole 42 formed through the side surface of the hollow cylindrical body part 41 , and are formed on the inner peripheral part of the socket 34 facing the gas passage 33. an engaging ball 44 that is retractable and retractable across the hollow portion 43 of the hollow cylindrical body portion 41 of the plug 38;
a pressing piece 46 that is arranged in the hollow part 43 of the hollow cylindrical body part 41 and presses the engagement ball 44 on the tip side;
a spring 45 disposed within the hollow part 43 of the hollow cylindrical body part 41 and urging the base end side of the pressing piece 46;
When attaching the joint 36 and the gas cutoff plug 38 to the socket 34, press the hollow cylindrical body 41 until the tip of the hollow cylindrical body 41 comes into contact with the end 48 on the large diameter portion 34b side. When inserted into the gas passage 33 of the socket 34, the engagement ball 44 is pushed by the pressing piece 46 urged by the spring 45 and engages with the engagement tapered surface 40. The joint 36 and the gas cutoff plug 38 are attached,
When removing the joint 36 and the gas cutoff plug 38 from the socket 34, when the hollow cylindrical body portion 41 is pulled out from the gas passage 33 of the socket 34, the engagement ball 44 is removed from the engagement tapered surface 40. The socket escapes and enters the hollow part 43 of the hollow cylindrical body part 41, and at this time, the pressing piece 46 is pushed by the engagement ball 44 and retreats against the biasing force of the spring 45. The joint 36 and the gas cutoff plug 38 are removed from 34,
The pressing piece 46 is
When attaching the joint 36 to the socket 34, a pressing piece having a gas passage 50 in the center is used,
This configuration is characterized in that when attaching the gas cutoff plug 38 to the socket 34, a pressing piece in which the gas passage 50 is not provided is used.

In the casting mold manufacturing apparatus according to a second aspect of the present invention, the socket 34 has a positioning step portion 47 formed in a boundary portion between the small diameter portion 34a and the large diameter portion 34b and comes into contact with the surface 31a of the nozzle plate 31. It consists of the structure of Claim 1 which consists of.

According to the casting mold manufacturing apparatus according to claim 1, the sockets 34 having the gas passages 33 are press-fitted and fixed in advance into the numerous socket mounting holes 32 penetrating the entire surface of the nozzle plate 31, and the mold making work is performed. When carrying out this process, a joint 36 to which a gas supply nozzle 35 communicating with the gas passage 33 is attached is attached to the socket 34 facing the thick-walled part 5a of the casting die 5, as shown in FIG. As shown in FIG. 5, gas cutoff plugs 38 provided with a cutoff wall 37 for blocking the gas passage 33 are attached to the sockets 34 facing the thin walled portions 5b of the mold 5 via attachment means 39, respectively. ing. The socket 34 includes a small diameter portion 34a that is press-fitted into the socket mounting hole 32 of the nozzle plate 31, and a small diameter portion 34a extending from the small diameter portion 34a between the opposing surfaces of the plate body 29 and the nozzle plate 31. The end portion 48 on the side of the large diameter portion 34b is formed in a bottomed shape, and the end portion 48 on the side of the large diameter portion 34b is formed in a bottomed shape. A gas inlet 49 is provided for receiving gas flowing into the cavity 30. Furthermore, this attachment means 39 includes a hollow cylindrical body part 41 which is provided on the joint 36 and the gas cutoff plug 38 facing the gas passage 33 of the socket 34 and has a hollow part 43 formed therein. , is fitted into a fitting hole 42 penetrating through the side surface of the hollow cylindrical body part 41 , and an engagement tapered surface 40 formed on the inner peripheral part of the socket 34 facing the gas passage 33, and the joint 36 and the gas An engaging ball 44 that can extend and retract across the hollow part 43 of the hollow cylindrical body part 41 of the shutoff plug 38 is disposed within the hollow part 43 of the hollow cylindrical body part 41, and the engaging ball 44 is disposed in the hollow part 43 of the hollow cylindrical body part 41, and the engaging ball 44 is arranged in the hollow part 43 of the hollow cylindrical body part 41 and It has a pressing piece 46 that presses the combined ball 44, and a spring 45 that is arranged in the hollow part 43 of the hollow cylindrical body part 41 and biases the base end side of the pressing piece 46. . Thereby, when the joint 36 and the gas cutoff plug 38 are attached to each socket 34, the hollow cylindrical body portion 41 of the joint 36 and the gas cutoff plug 38 is attached to the end 48 on the large diameter portion 34b side. When inserted into the gas passage 33 of the socket 34 until the tip of the hollow cylindrical body part 41 comes into contact, the engaging ball 44 is pushed by the pressing piece 46 biased by the spring 45 and the engaging ball 44 is Since the joint 36 and the gas cutoff plug 38 are engaged with the mating tapered surface 40, the joint 36 and the gas cutoff plug 38 will not come out of each socket 34 into which they are inserted.

In this way, by simply inserting the joint 36 and the gas cutoff plug 38 into each socket 34, the joint 36 and the gas cutoff plug 38 can be reliably attached without coming out of the respective sockets 34. The gas cutoff plug 38 can be quickly and easily attached to the nozzle plate 31 through each socket 34 with a one-touch operation.

Further, when removing each socket 34 of the joint 36 and gas cutoff plug 38 from each socket 34, when the hollow cylindrical body part 41 is pulled out from the gas passage 33 of the socket 34, the engaging ball 44 is removed. It escapes from the engagement tapered surface 40 and sinks into the hollow part 43 of the hollow cylindrical body part 41, and at this time, the pressing piece 46 is pushed by the engagement ball 44 and resists the biasing force of the spring 45. Since the engaging ball 44 moves backward, the engaging ball 44 can smoothly escape from the engaging tapered surface 40. In this way, these joints 36 and gas cutoff plugs 38 can be quickly and easily removed from the nozzle plate 31 via the respective sockets 34 with a one-touch operation.

Therefore, when it is necessary to change the mounting position of the joint 36 and the gas cutoff plug 38 relative to the socket 34 in accordance with the arrangement of the thick walled part 5a and the thin walled part 5b of the mold 5, it is possible to quickly and easily do so with a one-touch operation. The joint 36 and the gas cutoff plug 38 can be installed over the entire surface of the nozzle plate 31 via the socket 34, eliminating the need for troublesome screwing operations as in the conventional case. It is also economical because there is no need to prepare in advance a large number of nozzle plates with different arrangements of gas supply nozzles for each mold with a different arrangement of thin-walled parts. .

According to the casting mold manufacturing apparatus according to claim 2 , a positioning step portion 47 that comes into contact with the surface 31a of the nozzle plate 31 is formed at the boundary between the small diameter portion 34a and the large diameter portion 34b of the socket 34. Therefore, when press-fitting and fixing the small-diameter portion 34a of the socket 34 into the socket mounting hole 32, the small-diameter portion 34b of the socket 34 is press-fitted until the positioning step portion 47 comes into contact with the surface 31a of the nozzle plate 31. 31, and the tip of the socket 34 does not protrude from the gas combustion chamber 20 side surface 31b of the nozzle plate 31, so that it can be inserted into many sockets 34. The amount of protrusion of the joint 36 from the gas combustion chamber 20 side surface 31b can be maintained uniformly for each socket 34. Furthermore, since the amount of protrusion in the gas combustion chamber 20 when the joint 36 with the gas supply nozzle 35 is attached to the nozzle plate 31 is small, the width L2 of the gas combustion chamber 20 is reduced, making the casting mold manufacturing apparatus larger. There's nothing to do.

FIG. 2 is an enlarged cross-sectional view of a casting mold attached to a burner plate, which is a main part of the casting mold manufacturing apparatus according to the present invention. It is a perspective view which shows the joint attached to the nozzle plate of a burner plate, and the nozzle for gas supply connected to this. FIG. 3 is a longitudinal sectional side view of a socket press-fitted into a nozzle plate of a burner plate, a joint attached to the socket, and a gas supply nozzle connected to the socket. FIG. 2 is a perspective view of a gas cutoff plug attached to a socket that is press-fitted into a nozzle plate of a burner plate. FIG. 3 is a longitudinal sectional side view of a socket that is press-fitted into a nozzle plate of a burner plate and a gas cutoff plug that is attached to the socket. FIG. 1 is a partially sectional plan view showing the entire casting mold manufacturing apparatus. FIG. 2 is a longitudinal side view of a conventional burner plate with an ignition coupler attached to it via an on-off valve body. They are sectional front views of a conventional burner plate attached to an on-off valve body and a state where ignition couplers are arranged and attached to a gas combustion chamber on the on-off valve body. Furthermore, it is a longitudinal sectional side view of a conventional burner plate in which a gas supply nozzle and a gas cutoff plug are screwed and arranged on a nozzle plate. FIG. 2 is a perspective view showing a conventional gas supply nozzle. FIG. 2 is a perspective view showing a conventional gas-blocking embolus.

FIG. 1 is an enlarged view of a part of the casting mold manufacturing apparatus, and a mold 5 is shown in chain lines on a pair of mold support frames 3 and a mold mounting plate 4 that can be relatively moved toward and away from each other. The mold 5 consists of a thick part 5a and a thin part 5b, and a hollow burner plate 27 is attached to the back side of each mold 5 in correspondence with the mold 5. This hollow burner plate 27 is made up of a plate body 29 in which a gas inlet 28 is provided, and a nozzle plate 31 that is provided with a gas circulation cavity 30 between opposing surfaces of the plate body 29. A large number of socket mounting holes 32 are formed through the entire surface of the nozzle plate 31.

As shown in FIGS. 1, 4, and 6, a socket 34 having a gas passage 33 is press-fitted into each of these socket mounting holes 32.

As shown in FIG. 1, a joint 36 to which a gas supply nozzle 35 is attached is attached to a portion of each socket 34 corresponding to the thick wall portion 5a of the casting die 5. A gas cutoff plug 38 is attached to the socket 34 at a portion corresponding to the thin wall portion 5b.

That is, as shown in FIG. 3, a joint 36 is provided with a gas supply nozzle 35 that communicates with the gas passage 33 of the socket 34, or as shown in FIG. A blocking plug 38 is adapted to be attached to the socket 34 via attachment means 39.

As shown in FIGS. 3 and 5, these attachment means 39 include an engaging tapered surface 40 formed on the inner circumference of the socket 34 facing the gas passage 33, and a tapered surface 40 for engagement formed facing the gas passage 33 of the socket 34. The engagement tapered surface 40 of the socket 34 is fitted into a hollow cylindrical body part 41 provided on the joint 36 and the gas cutoff plug 38, and a fitting hole 42 provided through the hollow cylindrical body part 41. an engaging ball 44 that can move in and out across the joint 36 and the hollow portion 43 of the hollow cylindrical body portion 41 of the gas cutoff plug 38; and a spring that engages the engaging ball 44 with the engaging tapered surface 40. 45 to protrude and press, and when the engaging ball 44 escapes from the engaging tapered surface 40 and enters the hollow part 43 of the hollow cylindrical body part 41, it is pushed by the engaging ball 44. and a substantially arrow-shaped pressing piece 46 that retreats against the biasing force of the spring 45.

The outer peripheral portion of the socket 34 may have the same diameter, but preferably has a small diameter portion 34a that is press-fitted into the socket mounting hole 32 of the nozzle plate 31 and a diameter that extends from the small diameter portion 34a, as shown in the figure. and a large diameter portion 34b exposed in the gas circulation cavity 30 between the opposing surfaces of the plate body 29 and the nozzle plate 31, and a nozzle at the boundary between the small diameter portion 34a and the large diameter portion 34b. A positioning step 47 is formed to abut on the surface 31a of the plate 31.

Although the socket 34 may have a hollow cylindrical shape, it is preferable that the end portion 42 on the large diameter portion 34b side is formed in a bottomed shape as shown in the figure, and the gas circulation cavity portion 30 is formed in the center thereof. A gas inlet 49 is provided to receive the flowing gas. Further, a gas passage 50 is provided in the center of the pressing piece 46 provided in the hollow part 43 of the hollow cylindrical body part 41 on the side of the joint 36 in FIG. After that, gas is ejected toward the casting mold 5 from the gas ejection hole 35a of the gas supply nozzle 35. On the other hand, the pressing piece 46 provided in the hollow cylindrical body portion 41 on the side of the gas cutoff plug 38 in FIG. 5 does not particularly need to be provided with a gas passage as shown in FIG. Reference numeral 51 denotes an airtight packing that maintains the airtightness of the sliding portion between the joint 36 or the plug 38 and the socket 34, but if the sliding portion is precisely finished, it is not necessary to provide it.

FIG. 2 shows a joint 36 with a gas supply nozzle 35 equipped with a gas supply hole 35a and a male thread 35b screwed into the female thread 36b of the joint 36, and an engagement ball 44 and an airtight packing 51 attached. Show appearance.

FIG. 4 shows the external appearance of a gas-blocking plug 38 that is provided with a blocking wall 37 that blocks the flow of gas, and has a knob 52 protruding from the blocking wall 37 in a substantially T-shape at the distal end thereof.

Sockets 34 are press-fitted and fixed into the nozzle plate 31 into a large number of socket mounting holes 32 extending through the entire surface of the nozzle plate 31. When performing the mold making work, the socket 34 facing the thick walled part 5a of the casting mold 5 is equipped with a joint 36 to which a gas supply nozzle 35 communicating with the gas passage 33 is attached, as shown in FIG. In addition, as shown in FIG. 5, the sockets 34 facing the thin-walled portions 5b of the casting mold 5 are equipped with mounting means 39 for gas-blocking plugs 38 each provided with a blocking wall 37 for blocking the gas passage 33. Attach via.

When the joint 36 and the gas cutoff plug 38 are installed in each socket 34, the hollow cylindrical body portion 41 of the joint 36 and the gas cutoff plug 38 is inserted into the gas passage 33 of the socket 34. , the engagement ball 44 fitted into the engagement hole 42 penetrating the hollow cylindrical body portion 41 is pushed by the pressing piece 46 urged by the spring 45 to the engagement tapered surface 40 of the socket 34. The engagement state of the engagement ball 44 with respect to the engagement tapered surface 40 is maintained by the engagement ball 44 being pressed by the pressing piece 46 urged by the spring 45, so that the joint 36 and the gas The cutoff plug 38 does not come out from each socket 34 into which it is inserted. Note that since the end portion 48 of the socket 34 is formed in a bottomed shape, when the joint 36 and the gas cutoff plug 38 are inserted into the socket 34, the tip of each hollow cylindrical body portion 41 is inserted into the socket 34. By sensing the contact with the end portion 48 of the holder, the insertion operation can be performed accurately.

In this way, by simply inserting the joint 36 and the gas cutoff plug 38 into each socket 34, the joint 36 and the gas cutoff plug 38 can be reliably attached without coming out of the respective sockets 34. The gas cutoff plug 38 can be quickly and easily attached to the nozzle plate 31 through each socket 34 with a one-touch operation.

In addition, when removing each socket 34 of the joint 36 and gas cutoff plug 38 from each socket 34, simply pull out the joint 36 and gas cutoff plug 38 from the socket 34 with a little force, and these hollow cylindrical bodies can be removed. The engaging ball 44 that is fitted into the portion 41 escapes from the engaging tapered surface 40 and sinks into the hollow portion 43 of the hollow cylindrical body portion 41, but at this time, the engaging ball 44 Since the pressing piece 46 is pushed back against the biasing force of the spring 45, the engagement ball 44 can be smoothly removed from the engagement tapered surface 40. In this way, these joints 36 and gas cutoff plugs 38 can be quickly and easily removed from the nozzle plate 31 via the respective sockets 34 with a one-touch operation.

As shown in FIG. 3, when inserting the joint 36 with the gas supply nozzle 35 into the socket 34 or removing it from the socket 34, hold the gas supply nozzle 35 or the joint 36 protruding from the socket 34 in your hand. As shown in FIG. Since there is no part of the plug 38 exposed from the socket 34, the knob 52 protruding from the blocking wall 37 in a substantially T-shape can be easily operated by holding it by hand, as shown in FIG.

In this way, when it is necessary to change the mounting position of the joint 36 and the gas cutoff plug 38 with respect to the socket 34 according to the arrangement of the thick wall part 5a and the thin wall part 5b of the casting mold 5, it is possible to quickly change the mounting position with a single touch operation. In addition, the joint 36 and the gas cutoff plug 38 can be easily installed over the entire surface of the nozzle plate 31 through the socket 34, and there is no need for the troublesome screwing operation as in the conventional method. It is economical because there is no need to prepare in advance a large number of nozzle plates with different arrangements, each equipped with a corresponding gas supply nozzle for each mold with a different arrangement of thick or thin wall parts. It is also practical.

The socket 34 also includes a small diameter portion 34a that is press-fitted and fixed into the socket mounting hole 32 of the nozzle plate 31, and a small diameter portion 34a extending from the small diameter portion 34a between the opposing surfaces of the plate body 29 and the nozzle plate 31. Since the large diameter portion 34b is exposed in the gas circulation cavity 30, the effective length of the socket 34 can be increased by using the gas distribution cavity 30, and the socket 34 can be inserted into the socket 34. The insertion length of the joint 36 and the gas cutoff plug 38 can be stably secured with a margin. Moreover, since a positioning step 47 is formed at the boundary between the small-diameter portion 34a and the large-diameter portion 34b of the socket 34, which contacts the surface 31a of the nozzle plate 31, the small-diameter portion 34a of the socket 34 is connected to the socket mounting hole 34. When press-fitting and fixing to the nozzle plate 31, the small diameter portion 34b of the socket 34 is press-fitted so as to accurately match the thickness width of the nozzle plate 31 by press-fitting the positioning step portion 47 until it comes into contact with the surface 31a of the nozzle plate 31. Since the tip of the socket 34 does not protrude from the gas combustion chamber 20 side surface 31b of the nozzle plate 31, the joint 36 inserted into many sockets 34 does not protrude from the gas combustion chamber 20 side surface 31b. The amount can be maintained uniformly for each socket 34.

Furthermore, since the amount of protrusion in the gas combustion chamber 20 when the joint 36 with the gas supply nozzle 35 is attached to the nozzle plate 31 is small, the width L2 of the gas combustion chamber 20 is reduced, making the casting mold manufacturing apparatus larger. There's nothing to do.

3 Mold support frame 5 Mold mold 27 Burner plate 28 Gas inlet 29 Plate body 30 Gas circulation cavity 31 Nozzle plate 31a Nozzle plate surface 32 Socket mounting hole 33 Gas passage 34 Socket 34a Socket small diameter portion 34b Socket Large diameter portion 35 Gas supply nozzle 36 Joint 37 Blocking wall 38 Gas blocking plug 39 Attachment means 40 Tapered surface for engagement 41 Hollow cylindrical body portion 42 Fitting hole 43 Hollow portion 44 Engagement ball 45 Spring 46 Pressing piece 47 For positioning Stepped section

Claims (2)

A mold is fixed to each opposing surface of a pair of mold support frames that can be moved relatively toward and away from each other, and a hollow burner plate is provided on the back side of each mold, corresponding to each mold. The burner plate is a casting mold manufacturing device consisting of a plate main body provided with a gas inlet and a nozzle plate provided with a gas circulation cavity between surfaces facing the plate main body.
A large number of socket mounting holes are formed through the entire surface of the nozzle plate, a socket having a gas passage is press-fitted into each of these socket mounting holes, and each socket is equipped with a joint or a gas supply nozzle that communicates with the gas passage. A gas cutoff plug equipped with a cutoff wall that cuts off the gas passage is attached via a mounting means.
The socket is located in the gas circulation cavity having a small diameter portion that is press-fitted into the socket mounting hole of the nozzle plate and an extending space between the opposing surfaces of the plate body and the nozzle plate. It consists of a large diameter part,
The end on the side of the large diameter portion is formed in a bottomed shape, and a gas inlet is provided in the center of the end to receive the gas flowing into the gas circulation cavity,
The attachment means includes :
a hollow cylindrical body part that is provided on the joint and the gas cutoff plug facing the gas passage of the socket and has a hollow part formed therein ;
The hollow cylinder of the joint and gas cutoff plug is fitted into a fitting hole penetrating the side surface of the hollow cylindrical body part , and is formed on the inner peripheral part of the socket to face the gas passage. an engagement ball that can appear and retract across the hollow part of the body;
a pressing piece that is arranged in the hollow part of the hollow cylindrical body and presses the engagement ball on the tip side;
a spring disposed within the hollow portion of the hollow cylindrical body portion and biasing the proximal end side of the pressing piece;
When attaching the joint and the gas cutoff plug to the socket, insert the hollow cylindrical body into the gas passage of the socket until the tip of the hollow cylindrical body comes into contact with the end on the large-diameter side. Then, the engagement ball is pushed by the pressing piece urged by the spring and engages with the engagement tapered surface, so that the joint and the gas cutoff plug are attached to the socket,
When removing the joint and the gas cutoff plug from the socket, when the hollow cylindrical body part is pulled out from the gas passage of the socket, the engagement ball escapes from the engagement tapered surface and the hollow cylindrical body part The joint and the gas cutoff plug are removed from the socket because the pressing piece is pushed by the engagement ball and retreats against the biasing force of the spring. Become,
The pressing piece is
When attaching the joint to the socket, a pressing piece with a gas passage provided in the center is used,
A casting mold manufacturing apparatus in which a pressing piece in which the gas passage is not provided is used when attaching the gas cutoff plug to the socket. 2. The casting mold manufacturing apparatus according to claim 1 , wherein the socket has a positioning step portion formed in a boundary portion between the small diameter portion and the large diameter portion to come into contact with a surface of a nozzle plate.

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