JP2020175431A - Casting mold-manufacturing apparatus - Google Patents

Abstract

To easily and rapidly mount a joint with a gas supply nozzle, for supplying gas by opening a gas passage in a nozzle plate, and a shutdown plug for not supplying the gas by shutting down the gas passage.SOLUTION: A number of socket-mounting holes 32 are installed all over the surface of a nozzle plate 31, a socket 34 having a gas passage 33 is press-fit in each of the socket-mounting holes 32, and a joint 36 to which a gas supply nozzle 35 communicating with the gas passage 33 or a gas shutdown plug 38 to which a shutdown wall 37 for shutting down the gas passage 33 are provided in each socket 34, so that the joint 36 and an engaging ball 44 provided on the gas shutdown plug 38 are releasably provided to an engaging tapered surface 40 formed in the socket 34 through a pressing piece 46 abutting on a spring 45.SELECTED DRAWING: Figure 1

Description

The present invention relates to an apparatus for producing a mold such as a main mold and a core for casting a cast article made of aluminum, cast iron or the like.

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 moving block 2 which is freely detachable from the fixed block 1 A mold mold 5 is fixed to each facing surface via a mold support frame 3 and a mold mounting plate 4, and a large number of gas supply nozzles are provided in front of the gas combustion chamber 20 in each of the mold support frames 3. There is a burner plate 7 in which 6s are attached in a scattered manner.

Then, when manufacturing a mold, each of the gas supply nozzles 6 is ignited to heat the mold molds 5 and 5, and both mold molds 5 and 5 are designated by the arrows and virtual lines in FIG. As shown, they are joined to each other by a cylinder device 2A, mold sand is filled in both mold molds 5 and 5, and the mold sand is fired into a predetermined mold shape.

By the way, since the mold mold 5 has a thick portion 5a and a thin portion 5b corresponding to a desired mold shape, if the entire mold mold 5 is heated uniformly, the thick portion 5a may be used. However, the thin-walled portion 5b becomes hotter, and the sand in contact with the thin-walled 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, the on-off valve main body 11 having the gas passage 10 is screwed into the nozzle mounting holes 9 provided in the burner plate 7 at predetermined intervals, and the on-off valve main body 11 is always attached to the spring 12. An on-off valve 13 that is forced to close the gas passage 10 is provided, and an engaging ball 18 is engaged with the tip of the on-off valve main body 11.

A slider 15 urged by the spring 14 is provided on the outer peripheral tip side of the on-off valve main body 11, and is always located on the tip side urged by the spring 14, and the protrusion 17 on the inner peripheral side thereof is always located. It is in contact with the engaging ball 18.

Then, the slider 15 is manually moved against the urging force of the spring 14, so that the engaging ball 18 is immersed in the recess 15a on the inner peripheral surface of the tip of the slider 15, and the gas supply nozzle is used. The ignition coupler 8 composed of the plug 16 to which the 6 is attached in a protruding shape is fitted to the on-off valve main body 11, and then the slider 15 is released from the hand to be urged by the spring 14 and the slider 15 is in the original position. The engaging ball 18 engages with the engaging groove 19 provided on the outer peripheral surface of the plug 16 of the ignition coupler 8 by being pushed by the protrusion 17 protruding from the slider 15. An ignition coupler 8 composed of a plug 16 having a nozzle 6 attached in a protruding shape is attached to the on-off valve main body 11.

Therefore, as shown in FIG. 8, an ignition coupler 8 composed of a plug 16 to which the gas supply nozzle 6 is attached is attached to the nozzle mounting hole 6 facing the thick portion 5a of the mold mold 5 for ignition. Combustion gas is ejected from the gas supply nozzle 6 of the coupler 8 to heat the thick portion 5a, whereas the nozzle mounting hole 6 facing the thin portion 5b of the mold mold 5 has a socket body. By not attaching the ignition coupler 8 to 11, the on-off valve 13 in the on-off valve main body 11 is urged by the spring 12 to close the gas passage 10, and the combustion gas directly enters the thin-walled portion 5b. The degree of heating is low without hitting.

By the way, in the conventional structure shown in Patent Document 1, as shown in FIG. 7, a spring 12 for urging the on-off valve 13 for opening and closing the gas passage 10 is provided, and the ignition coupler 8 is attached to the on-off valve main body 11. Since the slider 15 for attaching / detaching operation and the spring 14 for urging the slider 15 are provided, a troublesome operation of the slider 15 for attaching / detaching the ignition coupler 8 to the on-off valve main body 11 is required, and the slider 15 is particularly urged. Since 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, the spring 14 causes oxidative corrosion in a short period of time, and is also shown in FIG. As described above, since the protruding width of the gas supply nozzle 6 attached to the ignition coupler 8 in the protruding state is large, the width L1 of the gas combustion chamber 20 for heating the mold mold 5 becomes larger than necessary, which has an effect. Therefore, the mounting position of the mold mold 5 protrudes more than necessary, and there is a fatal problem that the size of the entire device cannot be avoided.

In order to improve this, as shown in Patent Document 2 and as shown in FIG. 9, the burner plate 21 can be attached to and detached from the plate main body 23 provided with the gas introduction port 22 and the plate main body 23. The nozzle plate 24 is formed separately from the nozzle plate 24 to be mounted, and the nozzle mounting hole 9 provided on the entire surface of the nozzle plate 24 is composed of a female screw 9a, and is aligned with the thick portion 5a or the thin portion 5b of the mold mold 5. In the nozzle mounting hole 9 facing the thick portion 5a, the male screw 25a of the gas supply nozzle 25 shown in FIG. 10 is screwed into the female screw 9a of the nozzle mounting hole 9, and the nozzle mounting hole 9 facing the thin wall portion 5b. The stopper 26 shown in FIG. 11 is attached by screwing the male screw 26a into the female screw 9a of the nozzle mounting hole 9.

Then, a large number of nozzle plates 24 to which the gas supply nozzle 25 and the plug 26 are screwed in a desired arrangement state corresponding to the arrangement shape of the thick portion 5a and the thin wall portion 5b of the mold mold are prepared in advance, and the mold is prepared. When replacing the mold 5 with another mold mold 5 having a different internal shape, the nozzle plate 24 of the burner plate 21 used up to that point is removed from the plate body 23, and the plate body 23 is subjected to the above-mentioned other mold. The nozzle plate 24 to which the gas supply nozzle 25 and the plug 26 are attached is replaced and attached in a desired arrangement state corresponding to the internal shape of the mold 5.

With this structure, the gas is also screwed into the female screw 9a of the mounting hole 9 of the burner plate 24 one by one by screwing the male screw 25a of the gas supply nozzle 25 shown in FIG. 10 and the male screw 26a of the embolus 26 shown in FIG. There is a fatal drawback that a large number of different burner plates 24 having different arrangements of the supply nozzle 25 and the embolus 26 must be manufactured and prepared in advance, and the troublesome screwing operation cannot be released. It was.

Real Fairness 2-14830 JP-A-10-58088

In the present invention, the burner plate is divided into a plate body and a nozzle plate, and a gas passage is opened to the nozzle plate to supply gas to the joint and a joint with a gas supply nozzle, and the gas passage is cut off to supply gas. It is an object of the present invention to provide a casting mold manufacturing apparatus capable of easily and quickly attaching a closing plug for not performing.

As shown in FIG. 1, the casting mold manufacturing apparatus according to claim 1 has a mold mold 5 fixed to each facing surface of a pair of mold support frames 3 that are relatively movable and detachable, and each mold mold. A hollow burner plate 27 is provided on the back side of each corresponding to 5, and the hollow burner plate 27 is provided between the plate main body 29 provided with the gas introduction port 28 and the facing surface between the plate main body 29. In a casting mold manufacturing apparatus including a nozzle plate 31 provided across a gas flow space 30 provided in the above.
A large number of socket mounting holes 32 are formed on the entire surface of the nozzle plate 31, and as shown in FIG. 4 or 6, a socket 34 having a gas passage 33 is press-fitted and fixed in each of these socket mounting holes 32, and each socket 34 is fixed. A joint 36 having a gas supply nozzle 35 communicating with the gas passage 33 or a gas shutoff plug 38 provided with a blocking wall 37 for blocking the gas passage 33 is attached via an attachment means 39.
These mounting means 39 include an engaging tapered surface 40 formed on the inner peripheral portion of the socket 34 facing the gas passage 33, and the joint 36 and a gas shutoff plug facing the gas passage 33 of the socket 34. Hollow cylindrical body portion 41 provided in 38 and
Engaged in the engaging hole 42 penetrating the hollow cylindrical body portion 41, the engaging tapered surface 40 of the socket 34 and the hollow portion 43 of the hollow cylindrical body portion 41 of the joint 36 and the gas shutoff plug 38. Engagement ball 44 that can appear and disappear over
The engaging ball 44 is urged and pushed by the spring 45 so as to engage with the engaging tapered surface 40, and the engaging ball 44 escapes from the engaging tapered surface 40 to escape from the engaging tapered surface 40 to form the hollow cylindrical body portion. It is composed of a pressing piece 46 that is pushed by the engaging ball 44 and retracts against the urging force of the spring 45 when immersed in the hollow portion 43 of the 41.

In the casting mold manufacturing apparatus according to claim 2, the socket 34 extends from the small diameter portion 34a and the small diameter portion 34a to be press-fitted and fixed in the socket mounting hole 32 of the nozzle plate 31, and the plate body 29 and the nozzle plate. Positioning consisting of a large-diameter portion 34b exposed to the gas flow space 30 between the facing surfaces of the 31 and abutting on the surface 31a of the nozzle plate 31 at the boundary portion between the small-diameter portion 34a and the large-diameter portion 34b. The configuration according to claim 1, wherein the step portion 47 is formed.

According to the casting mold manufacturing apparatus according to claim 1, the socket 34 having the gas passage 33 is press-fitted and fixed in advance in a large number of socket mounting holes 32 penetrating the entire surface of the nozzle plate 31, and the mold preparation work is performed. As shown in FIG. 3, the socket 34 facing the thick portion 5a of the mold mold 5 is provided with a joint 36 to which a gas supply nozzle 35 communicating with the gas passage 33 is attached. As shown in FIG. 5, a gas blocking plug 38 provided with a blocking wall 37 for blocking the gas passage 33 is attached to the socket 34 facing the thin portion 5b of the mold 5 via the mounting means 39, respectively. The mounting means 39 has an engaging tapered surface 40 formed on the inner peripheral portion of the socket 34 facing the gas passage 33, and the joint 36 and the gas shutoff facing the gas passage 33 of the socket 34. The hollow cylindrical body portion 41 provided in the plug 38 and the engaging hole 42 penetrating the hollow cylindrical body portion 41 are engaged, and the engaging tapered surface 40 of the socket 34, the joint 36, and the gas shutoff. The engaging ball 44 that can appear and disappear over the hollow portion 43 of the hollow cylindrical body portion 41 of the plug 38, and the engaging ball 44 are urged by the spring 45 to engage the engaging tapered surface 40 and are projected and pressed. At the same time, when the engaging ball 44 escapes from the engaging tapered surface 40 and is immersed in the hollow portion 43 of the hollow cylindrical body portion 41, it is pushed by the engaging ball 44 and exerts an urging force on the spring 45. Since it is composed of a pressing piece 46 that retracts against it, when the joint 36 and the gas shutoff plug 38 are attached to each socket 34, the hollow cylindrical body of these joints 36 and the gas shutoff plug 38. By inserting the portion 41 into the gas passage 33 of the socket 34, the engaging ball 44 engaged in the engaging hole 42 penetrating the hollow cylindrical body portion 41 is urged by the spring 45. The engaging ball 44 is engaged with the engaging tapered surface 40 of the socket 34, and the engaging ball 44 is engaged with the pressing piece 46 urged by the spring 45. Since it is pressed and maintained, the joint 36 and the gas shutoff plug 38 do not come out of each of the sockets 34 into which they are inserted.

In this way, the joint 36 and the gas shutoff plug 38 can be securely mounted without coming out of each socket 34 only by inserting the joint 36 and the gas shutoff plug 38 into each socket 34. The gas shutoff plug 38 can be quickly and easily attached to the nozzle plate 31 via each socket 34 by a one-touch operation.

Further, when removing each socket 34 of the joint 36 and the gas shutoff plug 38 from each socket 34, these hollow cylinders can be obtained by simply pulling out the joint 36 and the gas shutoff plug 38 slightly strongly from the socket 34. The engaging ball 44 engaged with the portion 41 escapes from the engaging tapered surface 40 and immerses itself in the hollow portion 43 of the hollow cylindrical body portion 41. At this time, the engaging ball 44 is inserted into the engaging ball 44. Since the pressing piece 46 retracts against the urging force of the spring 45 when pushed, the engaging ball 44 can be smoothly escaped from the engaging tapered surface 40. In this way, the joint 36 and the gas shutoff plug 38 can be quickly and easily removed from the nozzle plate 31 via each socket 34 by a one-touch operation.

Therefore, when it is necessary to change the mounting position of the joint 36 and the gas shutoff plug 38 with respect to the socket 34 according to the arrangement of the thick portion 5a and the thin portion 5b of the mold mold 5, it is quick and easy by one-touch operation. The joint 36 and the gas shutoff plug 38 can be applied to the entire surface of the nozzle plate 31 via the socket 34, which does not require a troublesome screwing operation as in the conventional case, and a gas supply nozzle or the like is provided in a thick portion. It is economical because it is not necessary to prepare in advance a large number of nozzle plates having different arrangement states equipped with gas supply nozzles corresponding to the molds having different arrangements of thin-walled parts. ..

According to the casting mold manufacturing apparatus according to claim 2, the socket 34 extends from the small diameter portion 34a fixed by press-fitting into the socket mounting hole 32 of the nozzle plate 31 and the small diameter portion 34a, and the plate body 29 and the above. Since it is composed of a large diameter portion 34b exposed to the gas flow space portion 30 between the facing surfaces of the nozzle plate 31, the effective length of the socket 34 is increased by utilizing the gas flow space portion 30. It can be taken, and the insertion length of the joint 36 and the gas shutoff plug 38 to be inserted into the socket 34 can be stably secured with a margin. Moreover, since the positioning step portion 47 that abuts on the surface 31a of the nozzle plate 31 is formed at the boundary portion between the small diameter portion 34a and the large diameter portion 34b of the socket 34, the small diameter portion 34a of the socket 34 is formed in the socket mounting hole 32. When the positioning step portion 47 is press-fitted into the nozzle plate 31 until it comes into contact with the surface 31a of the nozzle plate 31, the small-diameter portion 34b of the socket 34 is press-fitted so as to exactly match the thickness and width 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 each of the many sockets 34 protrudes from the gas combustion chamber 20 side surface 31b. The amount can be maintained uniformly for each socket 34.
Further, 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 small, and the casting mold manufacturing apparatus is enlarged. There is nothing to do.

It is an enlarged cross-sectional view of the state in which the mold mold is attached to the burner plate which is the main part of the casting mold manufacturing apparatus which concerns on this invention. It is a perspective view which shows the joint attached to the nozzle plate of a burner plate, and the gas supply nozzle connected to this. It is a vertical sectional side view of the socket fixed by press-fitting to the nozzle plate of the burner plate, the joint attached to the socket, and the gas supply nozzle connected to the socket. It is a perspective view of the gas shutoff plug attached to the socket which is press-fitted and fixed to the nozzle plate of a burner plate. It is a longitudinal side view of the socket fixed by press-fitting to the nozzle plate of the burner plate and the gas shutoff plug attached to the socket. It is a partial cross-sectional plan view which shows the whole of the mold manufacturing apparatus for casting. It is a longitudinal side view of a state in which an ignition coupler is attached to a conventional burner plate via an on-off valve main body. It is a cross-sectional front view of the state where the on-off valve main body is attached to the conventional burner plate, and the state where the ignition coupler is arranged and attached to the gas combustion chamber on the on-off valve main body. Further, it is a vertical sectional side view of a state in which a gas supply nozzle and a gas shutoff embolus are screwed and arranged on a nozzle plate of a conventional burner plate. It is a perspective view which shows the conventional gas supply nozzle. It is a perspective view which shows the conventional gas shut-off embolus.

FIG. 1 is an enlarged view of a part of a casting mold manufacturing apparatus, in which a mold mold 5 is shown by a chain wire on a pair of mold support frames 3 and a mold mounting plate 4 that are relatively detachable. The mold mold 5 is composed of a thick portion 5a and a thin portion 5b thereof, and a hollow burner plate 27 is attached to the back side of each of the mold molds 5 corresponding to the mold mold 5. The hollow burner plate 27 is composed of a plate main body 29 provided with a gas introduction port 28 and a nozzle plate 31 provided with a gas flow space 30 provided between facing surfaces of the plate main body 29. , A large number of socket mounting holes 32 are formed on the entire surface of the nozzle plate 31.

Then, as shown in FIGS. 1, 4 and 6, a socket 34 having a gas passage 33 is press-fitted and fixed in 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 the socket 34 of the portion of each socket 34 corresponding to the thick portion 5a of the mold mold 5, and the mold mold 5 is attached. A gas shutoff plug 38 is attached to the socket 34 of the portion corresponding to the thin portion 5b of the above.

That is, as shown in FIG. 3, a joint 36 having a gas supply nozzle 35 communicating with the gas passage 33 of the socket 34, or as shown in FIG. 5, a gas provided with a blocking wall 37 for blocking the gas passage 33. The blocking plug 38 is attached to the socket 34 via the attachment means 39.

As shown in FIGS. 3 and 5, these mounting means 39 have an engaging tapered surface 40 formed on the inner peripheral portion of the socket 34 facing the gas passage 33 and a surface on the gas passage 33 of the socket 34. Then, the hollow cylindrical body portion 41 provided in the joint 36 and the gas shutoff plug 38 and the engaging hole 42 penetrating the hollow cylindrical body portion 41 are engaged, and the engaging tapered surface 40 of the socket 34 is engaged. An engaging ball 44 that can appear and disappear over the joint 36 and the hollow portion 43 of the hollow cylindrical body portion 41 of the gas shutoff plug 38, and a spring that engages the engaging ball 44 with the engaging tapered surface 40. While being urged by 45 to project and press, the engaging ball 44 is pushed by the engaging ball 44 when it escapes from the engaging tapered surface 40 and is immersed in the hollow portion 43 of the hollow cylindrical body portion 41. It is composed of a pressing piece 46 having a substantially arrow shape that retracts against the urging force of the spring 45.

The socket 34 may have the same outer diameter, but is preferably extended from the small diameter portion 34a fixed by press fitting into the socket mounting hole 32 of the nozzle plate 31 and the small diameter portion 34a as shown in the drawing. It is composed of a large diameter portion 34b exposed to the gas flow space 30 provided between the plate main body 29 and the nozzle plate 31 facing each other, and a nozzle is formed at a boundary portion between the small diameter portion 34a and the large diameter portion 34b. A positioning step portion 47 that abuts on the surface 31a of the plate 31 is formed.

Further, the socket 34 may have a hollow cylindrical shape, but preferably, as shown in the figure, the end portion 42 on the large diameter portion 34b side is formed in a bottomed shape, and the empty space portion 30 for gas distribution is formed in the central portion thereof. A gas inlet 49 for receiving the circulating gas is provided. Further, a gas passage path 50 is provided at the center of the pressing piece 46 provided in the hollow portion 43 of the hollow cylindrical body portion 41 on the joint 36 side in FIG. 3, and the passage 36a provided in the joint 36 from the passage passage 50 is provided. Then, gas is ejected from the gas ejection hole 35a of the gas supply nozzle 35 toward the mold mold 5. On the other hand, the pressing piece 46 provided in the hollow cylindrical body portion 41 on the gas shutoff plug 38 side of FIG. 5 does not need to be provided with a gas passage path as shown in FIG. Reference numeral 51 denotes an airtight packing for maintaining the airtightness of the sliding portion between the joint 36 or the plug 38 and the socket 34, but it is not necessary to provide the airtight packing when the sliding portion is precisely finished.

FIG. 2 shows a joint 36 with a gas supply nozzle 35 in which a gas supply nozzle 35 provided with a gas supply hole 35a and a male screw 35b is screwed into a female screw 36b of a joint 36, and an engaging ball 44 and an airtight packing 51 are attached. Show the appearance.

FIG. 4 shows the appearance of a gas blocking plug 38 provided with a blocking wall 37 for blocking the flow of gas, and a knob 52 protruding from the blocking wall 37 in a substantially T shape on the tip end side thereof.

Then, the socket 34 is press-fitted and fixed to the nozzle plate 31 into a large number of socket mounting holes 32 penetrating the entire surface thereof. Then, when performing the mold forming work, as shown in FIG. 3, a joint 36 having a gas supply nozzle 35 communicating with the gas passage 33 attached to the socket 34 facing the thick portion 5a of the mold mold 5 is attached. In addition, as shown in FIG. 5, a gas blocking plug 38 provided with a blocking wall 37 for blocking the gas passage 33 is attached to the socket 34 facing the thin portion 5b of the mold mold 5, respectively. Install via.

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

In this way, the joint 36 and the gas shutoff plug 38 can be securely mounted without coming out of each socket 34 only by inserting the joint 36 and the gas shutoff plug 38 into each socket 34. The gas shutoff plug 38 can be quickly and easily attached to the nozzle plate 31 via each socket 34 by a one-touch operation.

Further, when removing each socket 34 of the joint 36 and the gas shutoff plug 38 from each socket 34, these hollow cylinders can be obtained by simply pulling out the joint 36 and the gas shutoff plug 38 slightly strongly from the socket 34. The engaging ball 44 engaged with the portion 41 escapes from the engaging tapered surface 40 and immerses itself in the hollow portion 43 of the hollow cylindrical body portion 41. At this time, the engaging ball 44 is inserted into the engaging ball 44. Since the pressing piece 46 retracts against the urging force of the spring 45 when pushed, the engaging ball 44 can be smoothly escaped from the engaging tapered surface 40. In this way, the joint 36 and the gas shutoff plug 38 can be quickly and easily removed from the nozzle plate 31 via each socket 34 by a one-touch operation.

As shown in FIG. 3, when the joint 36 with the gas supply nozzle 35 is inserted into or removed from the socket 34, the gas supply nozzle 35 or the joint 36 protruding from the socket 34 is held in the hand. However, as shown in FIG. 5, when the gas shutoff plug 38 provided with the cutoff wall 37 is inserted into or removed from the socket 34, the gas shutoff is performed as shown in the drawing. Since the plug 38 does not have a portion exposed from the socket 34, as shown in FIG. 4, the knob 52 protruding from the blocking wall 37 in a substantially T shape can be easily operated by holding it by hand.

In this way, when it is necessary to change the mounting position of the joint 36 and the gas shutoff plug 38 with respect to the socket 34 according to the arrangement of the thick portion 5a and the thin portion 5b of the mold mold 5, the one-touch operation is performed quickly. Moreover, the joint 36 and the gas shutoff plug 38 can be easily applied to the entire surface of the nozzle plate 31 via the socket 34, and the troublesome screwing operation as in the conventional case is not required, and the gas supply nozzle and the like are thickened. It is economical because it is not necessary to prepare in advance a large number of nozzle plates with different arrangement states equipped with gas supply nozzles corresponding to each mold mold having a different arrangement of the meat part and the thin part. It is also practical.

Further, the socket 34 extends from the small diameter portion 34a fixed by press-fitting into the socket mounting hole 32 of the nozzle plate 31 and the small diameter portion 34a, and has the gas between the plate main body 29 and the facing surface of the nozzle plate 31. Since it is composed of a large-diameter portion 34b exposed to the distribution space portion 30, the effective length of the socket 34 can be increased by using the gas circulation space portion 30, and the socket 34 is inserted into the socket 34. The insertion length of the joint 36 and the gas shutoff plug 38 can be stably secured with a margin. Moreover, since the positioning step portion 47 that abuts on the surface 31a of the nozzle plate 31 is formed at the boundary portion between the small diameter portion 34a and the large diameter portion 34b of the socket 34, the small diameter portion 34a of the socket 34 is formed in the socket mounting hole 32. When the positioning step portion 47 is press-fitted into the nozzle plate 31 until it comes into contact with the surface 31a of the nozzle plate 31, the small-diameter portion 34b of the socket 34 is press-fitted so as to exactly match the thickness and width 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 each of the many sockets 34 protrudes from the gas combustion chamber 20 side surface 31b. The amount can be maintained uniformly for each socket 34.

Further, 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 small, and the casting mold manufacturing apparatus is enlarged. There is nothing to do.

3 Mold support frame 5 Mold mold 27 Burner plate 28 Gas inlet 29 Plate body 30 Vacancy for gas flow 31 Nozzle plate 31a Nozzle plate surface 32 Socket mounting hole 33 Gas passage 34 Socket 34a Small diameter part of socket 34b Socket Large diameter part 35 Gas supply nozzle 36 Joint 37 Blocking wall 38 Gas blocking plug 39 Mounting means 40 Engaging taper surface 41 Hollow cylindrical body 42 Engaging hole 43 Hollow part 44 Engaging ball 45 Spring 46 Pressing piece 47 For positioning Step

Claims (2)

A mold mold is fixed to each facing surface of a pair of mold support frames that are relatively removable, and a hollow burner plate is provided on the back side of each mold according to each mold, and this hollow shape is provided. The burner plate of the above is used in a casting mold manufacturing apparatus including a plate main body provided with a gas inlet and a nozzle plate provided between a facing surface with the plate main body and sandwiching a gas flow space.
A large number of socket mounting holes are provided on the entire surface of the nozzle plate, sockets having gas passages are press-fitted and fixed to each of these socket mounting holes, and each socket is equipped with a gas supply nozzle that communicates with the gas passage. A gas shutoff plug provided with a shutoff wall that shuts off the gas passage is attached via an attachment means.
These mounting means include an engaging tapered surface formed on the inner peripheral portion of the socket facing the gas passage, and a hollow cylindrical body provided on the joint and the gas shutoff plug facing the gas passage of the socket. Department and
An engaging ball that is engaged in an engaging hole that penetrates the hollow cylindrical portion and can appear and disappear over the engaging tapered surface of the socket and the hollow portion of the hollow cylindrical portion of the joint and the gas shutoff plug. ,
The engaging ball is urged by a spring to engage with the engaging tapered surface to project and press, and the engaging ball escapes from the engaging tapered surface and is immersed in the hollow portion of the hollow cylindrical body portion. A casting mold manufacturing apparatus comprising: a pressing piece that is pushed by the engaging ball and retracts against the urging force of the spring. The socket has a small diameter portion that is press-fitted and fixed to the socket mounting hole of the nozzle plate and a large diameter portion that extends from the small diameter portion and is located between the plate main body and the nozzle plate facing the facing surface and is located in the gas flow space. The casting mold manufacturing apparatus according to claim 1, further comprising a portion and forming a positioning step portion that abuts on the surface of the nozzle plate at a boundary portion between the small diameter portion and the large diameter portion.

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