JP3339503B2 - Mold for cast-in pipe - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold for a pipe insert which is used for producing a casting having a fluid circuit therein by an insert molding method, and more particularly to a mold having a complicated shape such as an integrated brake caliper. Suitable for the production of castings.

[0002]

2. Description of the Related Art A product having a fluid circuit formed therein can be manufactured by performing a plurality of drilling operations on a casting after casting. However, a complicated fluid circuit is not formed by the drilling process, and the formed hole is plugged. It becomes necessary. On the other hand, according to the cast-in method in which a molten metal (cast-in material) is injected into a mold in which a pipe (stuff-in-mold material) is set at a predetermined position inside, a fluid circuit is formed by the cast-in pipe. The process becomes very easy. In order to prevent melting and improve the adhesion to the cast-in material, the pipe to be cast is subjected to heat insulating material application, plating treatment, and the like. In addition, a method of feeding a refrigerant into the pipe during casting to cool the pipe is also partially adopted.

[0003]

When a molten metal is poured into a mold in which a pipe is set and cast, the periphery of the pipe, which is a to-be-filled material, tends to solidify faster than other parts. The partially solidified molten metal hinders the supply of molten metal to other parts. As a result, casting defects such as nests and poor runoff tend to occur. The tendency of occurrence of casting defects becomes more remarkable as the shape becomes more complicated with a thick portion and a thin portion as in an opposed piston type disc brake.

[0004] More specifically, as shown in FIG. 1, the rotor 1 faces a space near the center of the caliper body 2, and a brake pad 4 attached to the tip of a piston 3.
In the opposed piston type disk brake having a structure in which the rotor 1 is opposed to both side surfaces of the rotor 1, oil is sent from a pipe 5 to a cylinder 6 and hydraulic pressure is applied to a piston 3, whereby a brake pad 4 sandwiches the rotor 1 and applies a brake to an axle. Multiply. At this time, a reaction force is generated in the direction in which the bridge portion 7 of the caliper body 2 opens. In the caliper body 2 made of aluminum, the bridge portion 7 may be fatigued by metal due to the reaction force and cracks may occur. However, the bridge portion 7 where the thickness variation is large is also a location where casting defects are likely to occur. .

[0005]

SUMMARY OF THE INVENTION The present invention has been devised in order to solve such a problem, and the molten metal injected into the mold cavity is controlled and cooled in accordance with a portion of the molten metal. An object of the present invention is to provide a mold suitable for casting a casting having a good wall thickness and shape without defects such as shortage and a void.

[0006] In order to achieve the object, a pipe casting mold of the present invention is a mold for casting a casting in which a pipe constituting a fluid circuit is cast, and a refrigerant supply pipe having an open end is provided. Inserted into a hole formed in the surface of the mold, and has a structure without a refrigerant discharge tube connected to the hole,
Cooling means having a function of solidifying the molten metal injected into the cavity from a side far from the gate is provided at a plurality of locations of the mold so as to be individually controllable. One or more heating or heat insulating means can also be incorporated into the mold for pipe stuffing. As the heating or heat insulating means, a structure in which a heater or a heat insulating material is inserted into a bottomed hole formed in the mold surface is adopted.

Cooling means such as a structure in which a coolant supply pipe having an open end in a bottomed hole formed in the core is inserted into the core set inside the mold can also be incorporated. Of course, a core without a cooling means, such as a sand mold, a shell core, and a mold, can also be used. A support portion for holding or holding and fixing the pipe to be cast may be formed in the core. As the cooling means, a method is used in which a coolant supply pipe with an open end is inserted into a hole formed in the mold surface, and cooling water, mist, cool air, etc., jetted from the coolant supply pipe is brought into direct contact with the mold surface to cool the mold. Is preferred.

When the mold of the present invention is applied to the casting of a brake caliper, a core which is set inside the mold and forms a piston accommodating space of the caliper body, and a heat insulating or provided on a surface of the mold at a position corresponding to a bridge portion. A mold incorporating a heating means and individually controllable cooling means provided at a plurality of locations corresponding to the inner caliper section and the outer caliper section is used. With this mold, a pipe constituting the hydraulic circuit is cast, and an integrated caliper body in which the inner caliper section and the outer caliper section are connected by a thin bridge section is cast. It is preferable that an intermediate portion of the pipe to be cast is held by a support portion formed at the tip of the core. At least one end of the pipe is held by an insertion hole formed in a core or a mold, or is fixed by a fixing groove formed in an upper mold or a lower mold. Thus, the pipe is secured at a predetermined position without being displaced by the flow of the injected molten metal.

[0009]

In the following, description will be made by taking an example of an integrated caliper body of an opposed piston type disc brake, but the present invention is not limited to this, and the present invention is also applicable to the manufacture of other parts requiring a fluid passage inside. The same applies. The caliper body has a large thickness difference between a thick portion (outer caliper portion 8 and inner caliper portion 9) and a thin portion (bridge portion 7) as shown in FIG. Are sandwiched between the thick portions from both sides. Due to this complicated structure, when trying to cast the caliper body integrally, the thin part solidifies early and becomes a weir, the hot water does not sufficiently flow to the thick part on the back side, and when the thick part solidifies, The thin portion is pulled by the shrinkage force, and casting defects such as cast cavities and sink cavities are generated, and strength and fatigue fracture resistance are likely to deteriorate. Furthermore, the to-be-filled material set in the mold cavity is likely to be misaligned due to the flow energy, heat energy, buoyancy, etc. of the molten metal injected into the mold.

In the present invention, independently controllable cooling means are provided in the upper mold, the lower mold, and the core, and the respective cooling means are operated in the order farthest from the pouring gate during casting, thereby being injected into the mold. Direction is applied to the solidification of the molten metal to prevent casting defects such as lack of molten metal, cast cavities and sink marks. Water, mist, air, etc. can be used as the coolant used to cool the mold. However, rapid cooling is required in the part far from the gate, so that water is not applied to the molten metal in the part near the gate. Preferably, air is used as the refrigerant. Further, it is preferable to embed a heat insulating material in the mold portion forming the bridge portion 7 connecting the inner caliper portion 9 and the outer caliper portion 8, or to provide a heating device. The heat insulating material and the heating device partially delay the temperature drop of the molten metal in the bridge portion 7 at the time of casting, and prevent generation of a weir that hinders the flow of the molten metal. If the bridge part 7 solidifies early, the molten metal will not reach the caliper part far from the gate, and shortage of the molten metal will occur.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A mold used in the present invention is a split mold of an upper mold 10 and a lower mold 20, as shown in FIG. Upper die 10, Lower die 2
0, core 30 is a tool steel SK with excellent heat resistance and wear resistance
Made of D61 etc. The upper die 10 has a cavity 11 corresponding to almost half of the caliper body shape, and one side is a counter gate block 12. A fitting recess 13 into which the base 31 of the core 30 is fitted is formed substantially at the center of the sprue block 12. The lower mold 20 has a cavity 21 corresponding to the other half of the caliper body shape.
It corresponds to the counter gate block 12 and the gate block 14 of 0. Depressions 15 and 25 serving as gates are formed in the center of the gate block 14 of the upper die 10 and the gate block 24 of the lower die 20.

The core 30 has a pedestal 32 that is in contact with the end surfaces of the upper mold 10 and the lower mold 20 on the opposite side of the gate 15-25,
The base 31 rising from the pedestal 32 is the fitting recess 1 of the upper mold 10.
3 and a fitting recess (not shown) of the lower mold 20. One or more (two in FIG. 2) cores 33 protrude from the pedestal 32, and the cores 33 are inserted into holes provided in the block 34 of the lower die 20. The core 33 forms a piston accommodating space of the caliper body, and the block 3
4 forms a rotor accommodation space. At the tip of core 33,
A support portion 35 for fixing an intermediate portion of the pipe P, which is a material to be cast, is formed. The pipe P is bent into a shape that circulates through the inside of the caliper body.
The insertion holes 71 (FIG. 5) formed at the ends of the bases 3 and 33 on the side of the base 31 and the fixing grooves 73 and 74 (FIGS. 7 and 8) of the upper mold 10 or the lower mold 20 are inserted and fixed.

When the upper mold 10 and the lower mold 20 are put together, a mold cavity 11-21 corresponding to the profile of the caliper body is formed.
Gate 15 facing mold cavity 11-21 at 5, 25
25 are configured. Of the mold cavities 11-21,
The side on which the core 30 is set becomes the inner caliper 9,
The side facing the gate 15-25 is the outer caliper section 8.
In the example of FIG. 2, the sprue 15-25 is provided on the outer caliper section 8 side, but it is also possible to provide the sprue on the inner caliper section 9 side or side surface without being restricted by this.

Each of the upper mold 10 and the lower mold 20 has a structure shown in FIG.
As shown in (a) and (b), various cooling means are provided on the surface opposite to the cavities 11 and 21. On the surface of the upper mold 10, a first water cooling hole 41 corresponding to a mold cavity at a position substantially in the center of the inner caliper 9 on a side far from the depression 15 serving as a gate. Next, each of the pair of second
Water cooling holes 42, 42, mist cooling holes 43, 43, heat insulating material filling holes 44, 44, first air cooling holes 45, 45, and second air cooling holes 46, 46 are formed symmetrically. The first water cooling hole 51, the second water cooling hole 52, 52, and the mist cooling hole 5 are also provided on the surface of the lower mold 20 from the core 30 toward the depression 25 serving as a gate.
3, 53, third water cooling holes 54, 54, heat insulating material filling holes 55,
55, first air cooling holes 56, 56 and second air cooling holes 57, 57
Is formed.

The heat insulating material filling holes 44 and 55 are provided in the bridge 7 connecting the inner caliper 9 and the outer caliper 8.
(FIG. 1). The heat insulating material 61 is filled in the heat insulating material filling holes 44 and 55 as shown in FIG. Thereby, the heat conduction inside the mold is suppressed at this portion, and the cavities 11 and 12 at the corresponding locations are suppressed.
The cooling of the molten metal in 1 becomes slow. As a result, solidification of the bridge portion 7 is delayed, and the molten metal fed from the gate 15-25 is fed to the inner caliper portion 9 on the core 30 side. Note that, instead of the heat insulating material 61, a heating device such as an electric heater for preventing cooling by positively heating the mold or the molten metal may be inserted into the heat insulating material filling holes 44.55. On the other hand, if the heat insulator 61 or the heating device is not incorporated,
Since the temperature of the molten metal is preferentially lowered and easily solidified in the bridge portion 7 which is thinner than the other portions, the molten metal is not sufficiently replenished to the inner caliper portion 9, and as a result, the molten metal becomes insufficient.

A coolant supply pipe 62 is inserted into the first water cooling holes 41 and 51, as shown in FIG. The refrigerant supply pipe 62 is open near the bottom of the first water cooling holes 41 and 51. The cooling water w supplied through the refrigerant supply pipe 62 is:
The first water cooling hole 41,
After being ejected into the inside 51 and directly contacting the inner wall surfaces of the first water cooling holes 41, 51 to cool the upper mold 10 and the lower mold 20, they are discharged from the first water cooling holes 41, 51. Since the cooling water w is directly blown onto the surfaces of the upper mold 10 and the lower mold 20 to perform cooling, a large cooling capacity can be obtained. In order to make the cooling effective, the distance L from the bottom of the first water cooling holes 41 and 51 to the inner surface of the mold is preferably 5 to 10 mm. Distance L
If it is less than 5 mm, the upper mold 10 and the lower mold 20 become too thin, and are easily damaged by thermal shock or the like. Conversely, 10m
If the distance L exceeds m, a sufficient cooling effect cannot be obtained.
For the same reason, it is preferable that the distance from the bottom of the hole to the inner surface of the mold is 5 to 10 mm.

The water cooling mechanism in which the coolant supply pipe 62 is inserted into the first water cooling holes 41, 51 is easy to maintain because of its simple structure. Moreover, when the supply of the cooling water w is stopped, the cooling water w is immediately discharged from the first water cooling holes 41 and 51.
The cooling of the upper mold 10 and the lower mold 20 can be stopped. In this regard, a conventional general cooling method is a method of cooling by inserting cooling means in which the refrigerant supply pipe 62 and the drain pipe 64 have a double pipe structure into the first water cooling holes 41 and 51 (FIG. 4C). . In this method, the cooling water w sent from the refrigerant supply pipe 62
Is discharged from the drain pipe 64 without directly contacting the surfaces of the upper mold 10 and the lower mold 20. Therefore, the upper mold 10 and the lower mold 20 are cooled through the outer drain pipe 64, and a large cooling capacity cannot be obtained. Moreover, the cooling water w
Does not mean that the cooling water w remains in the refrigerant supply pipe 62 and the drain pipe 64 and the cooling of the upper mold 10 and the lower mold 20 is stopped. Furthermore, since it has a complicated structure, troublesome maintenance is required.

Similarly, a coolant supply pipe having a tip opened near the bottom of the hole is inserted into the other water cooling holes 42, 52, 54, the mist cooling holes 43, 53, and the air cooling holes 45, 46, 56, 57. The upper mold 10 and the lower mold 20 are directly cooled by sending cooling water, mist, cold air, and the like from the refrigerant supply pipe. A particularly large cooling capacity is required in a portion corresponding to the thick portion of the caliper body. Such a part, for example, the upper mold 10
As shown in FIG. 4D, a through hole 65 penetrating through the upper die 10 is formed as the second water cooling hole 42, and is made of copper or the like having good heat conductivity, and penetrates a cap 66 having a closed end. Hole 65
Attach to The molten metal injected into the cavity 11 comes into contact with the cooling water w sent out from the refrigerant supply pipe 62 via the cap 66, so that a greater cooling capacity can be obtained. In a portion near the gate 15-25, air cooling is employed to relatively slow down the temperature of the molten metal. In order to avoid the danger that the water used for cooling in the water cooling system comes into contact with the molten metal, air cooling is preferable for the portion near the gate 15-25.

The core 30 has a core 33 projecting from the base 31 toward the mold cavity 11-21. Core 3
5, a bottomed hole 36 extending in the axial direction is formed as shown in FIG. 5B, and a water supply pipe 67 is inserted into the bottomed hole 36. The water supply pipe 67 also has a tip opening 68 opened near the bottom of the bottomed hole 36, similarly to the refrigerant supply pipes 62 provided in the upper mold 10 and the lower mold 20. The cooling water w sent from the water supply pipe 67 comes into direct contact with the inner wall surface of the bottomed hole 36 to cool the mold and the molten metal, and then is discharged. Since the cooling water w has been sent to the tip of the core 33, the pipe P held at the tip of the core 33 is cooled via the core 33. Therefore, even if the molten metal injected into the mold cavity 11-21 from the gate at the final stage of casting is directly applied to the tip of the core 33, the pipe P is prevented from being damaged.

The base 31 of the core 30 has insertion holes 71 into which both ends of a pipe P bent into a predetermined shape are inserted.
Are drilled. The pipe P, whose both ends are inserted into the insertion holes 71, 71, is supported at its intermediate portion by a support portion 72 on the distal end surface of the core 33. As shown in FIG. 6, the support portion 72 includes a straight groove 72a, a groove 72b having a bent middle portion, a groove 72c having a wide middle portion, and a groove 72 having a double width.
2d, a groove 72e having a narrow middle portion, a groove 72f having a shallow groove bottom at the middle portion, a groove 72g having a deep groove bottom at the middle portion, and the like are formed on the distal end surface of the core 33.

By inserting the intermediate portion of the pipe P into the grooves 72a to 72g, the pipe P is securely held, and the displacement of the pipe P due to the flow energy of the molten metal during casting is prevented. Grooves 72b-72 with bends, wides, narrows, etc.
When a pipe P whose intermediate portion is deformed corresponding to a bent portion, a wide portion, a narrow portion, or the like is inserted into the core 33 having f as the support portion 72, the pipe P is more reliably held. The intermediate part of the pipe P is held by the support part 72, and both ends are inserted into the insertion holes 71 and 7.
1, the pipe P is kept in place during casting. Therefore, in the caliper body where the pipe P is cast, the pipe P
Will be arranged. The high position accuracy of the pipe P
When the pipe P is used in a hydraulic circuit, a small bleeder mounting hole is required when drilling a bleeder mounting hole connected to the pipe P, which is effective in preventing oil leakage. In addition, the overall thickness can be reduced.

The two ends of the pipe P are the upper die 10 and the lower die 2
0, the core 30 or the like is held or held and fixed. For example,
A pipe holding groove 71a (FIG. 9a) or a pipe insertion hole 71b (FIG. 9b) is formed in the upper mold 10, and one end of the mold 10 or 2 is formed.
The pipe P is set so as to face the outer surface of "0". In the caliper body casting, since the pipe P projects from the casting body as shown in FIG. 10, the bleeder mounting port X can be set with high accuracy. In this case, the hole Y for the hydraulic circuit reaching the pipe P is formed by cutting after casting. A method in which both ends of the pipe P are sandwiched between the pipe holding groove 71a of the upper die 10 and the pipe holding groove 71a of the core 30 (FIG. 10), one end is inserted into the insertion hole 71 of the core 30, and the other end is set downward. A method of fixing the pipe P by inserting it into the insertion hole 71 of the mold 20 (FIG. 1)
1) can also be adopted.

When the end of the pipe P is sandwiched and fixed between the upper mold 10 and the lower mold 20, the outer diameter of the pipe P and the fixing groove 73,
If the inner diameters of the pipes 74 (FIGS. 7 and 8) are the same, it takes a long time to set the pipe P, which may reduce productivity. To facilitate the setting of the pipe P, the fixing groove 7
It is preferable that the inner diameter of 3, 74 is larger than the outer diameter of pipe P. However, if the inner diameters of the fixing grooves 73 and 74 are simply increased, the set pipe P is wobble at the time of casting, and the position of the filled pipe P tends to fluctuate. Pipe P
Of the upper die 1 using elastic restoring force (Figs. 7 and 8)
0, can be prevented by being pinched by the lower mold 20 and the pipe P
Are firmly fixed between the upper mold 10 and the lower mold 20. Alternatively, a projection 71c (FIG. 13a) is formed inside a pipe insertion hole 71 having an inner diameter larger than that of the pipe P, and the pipe P is inserted between the pipe insertion hole 71 of the lower mold 20 and the similar projection 71c. The pipe P can be firmly fixed also by setting the end of the pipe P and sandwiching it between the upper mold 10 and the lower mold 20 (FIG. 13B). Further, a relatively shallow semi-elliptical pipe insertion hole 71a (FIG. 14a) is formed, and the pipe insertion hole 7a is formed.
The pipe P is firmly fixed also by sandwiching the pipe P arranged in 1a between the upper mold 10 and the lower mold 20 (FIG. 14B). Further, as shown in FIG. 14 (c), the concave portion 71d is provided in the groove of the lower die 20 and the convex portion 71e is provided in the groove of the upper die 10, and the pipe P is also firmly pressed by pressing the pipe P against the concave portion 71d by the convex portion 71e. Fixed to Further, the tip of the pipe P is bent outward (FIG. 15b), and a groove 11a of a mold is formed for the bending of the pipe P (FIG. 15a). 15c)
The fluctuation of the pipe P is suppressed.

The first water cooling holes 41 and 51, the second water cooling holes 42,
52, mist cooling holes 43, 53, third water cooling holes 54, first
Air cooling holes 45, 56, second air cooling holes 46, 57, bottomed hole 36
The flow rate, supply time, etc. of the cooling water, mist, and cool air supplied to are controlled independently. Therefore, the mold cavity 1
Appropriate cooling conditions can be set in consideration of the flow of the molten metal, solidification, and the like in the process of solidifying and cooling the molten metal injected into 1-21 into a caliper body. Basically, a cooling condition is adopted in which a portion farther from the gate 15-25 is cooled first. That is, the cooling action via the first water cooling holes 41, 51 is activated early, and the second water cooling holes 42, 52 → mist cooling holes 43,5.
The cooling is started in the order of 3 → third water cooling hole 54 → first air cooling hole 45, 56 → second air cooling hole 46,57. As a result, the molten metal injected into the mold cavity 11-21 is released from the gate 15-.
Unidirectional solidification from the opposite side of 25. In the bridge portion 7 which is easily solidified because of its small mass, the heat insulating material 61 delays the temperature drop of the molten metal. Therefore, the molten metal is sufficiently distributed to every corner of the mold cavity 11-21 despite the caliper body having a complicated shape that makes it difficult to run the molten metal. As a result, the obtained caliper body does not have a casting defect such as a sinkhole due to lack of a casting cavity and a molten metal, and a product having a sufficient thickness at each part.

Further, the middle part of the pipe P to be cast is the tip of the core 33, and both ends are supported by the base 31 of the core 30 or the fixing grooves 73, 74 of the upper mold 10 and the lower mold 20. Therefore, the pipe P is maintained at a predetermined position in the mold cavity 11-21 against the flow energy of the molten metal. Therefore, when a bleeder is mounted on the obtained caliper body, a hydraulic circuit can be formed by opening a small mounting hole and connecting the bleeder to the pipe P. Furthermore, since the intermediate portion of the pipe P, which is likely to be in direct contact with the flow of the molten metal injected into the mold cavity 11-21 at the end of casting, is cooled through the core 33 of the core 30, the pipe P is melted. It is arranged inside the caliper body without any loss. Therefore, the pipe P is used as a part of a hydraulic circuit without oil leakage.

[0026]

EXAMPLE The core 30 of FIG. 2 was set on the lower mold 20 of FIG. 8, and the upper mold 10 of FIG. 7 was overlaid. As a pipe P,
Using a 3000 series aluminum alloy pipe with an outer diameter of 6 mm and a wall thickness of 1.5 mm, the middle part is a support part 72 at the tip of the core 33
Into the upper die 10 by inserting both ends into the fixing grooves 74.
With the lower mold 20. A JIS AC4C aluminum alloy was used as a cast-in material, the temperature of the molten metal in the pool was set at 700 ° C., and the molten metal was injected into the mold cavity 11-21 by the inclined gravity casting method. Immediately after the molten metal is injected, cooling water is sent to the first water cooling holes 41, 51, and the second water cooling holes 42, 5
Each cooling means was operated at intervals of 5 seconds in the order of 2 → mist cooling holes 43, 53 → third water cooling holes 54 → first air cooling holes 45, 56 → second air cooling holes 46, 57. In addition, the bottomed hole 4 of the core 33
8, cooling water w was fed immediately after the injection of the molten metal.

Under the above conditions, the pipe P was cast, and ten caliper bodies were obtained. In each of the caliper bodies, the inner caliper portion 9, the outer caliper portion 8, and the bridge portion had sufficient thickness, and no casting defects such as a lack of hot water and a cavity were detected. Cast-in pipe P
The center position of the pipe is within ± 0.5 mm compared to the design value for any caliper body,
No erosion causing oil leakage or the like was observed.

For comparison, immediately after the start of the injection of the molten metal, the cooling means of each part were simultaneously operated to cast ten caliper bodies. In this case, up to seven of the ten pieces, the melt solidified in the bridge portion 7 first, so that a sufficient amount of the melt was not replenished to the inner caliper portion 9 and a target product shape could not be obtained. A large amount of cavities were detected in the remaining three cavities, and particularly, the cavities were concentrated in the inner caliper 9 far from the gate 15-25. Further, when the position of the cast-in pipe P was measured, the center position of the pipe was shifted from the design value by 1 mm or more in all three caliper bodies. As is clear from this comparison, by controlling the cooling conditions of each part in consideration of the shape and thickness of the caliper body, an integrated caliper body having a good shape and a pipe P being cast with high positional accuracy is provided. Was obtained.

[0029]

As described above, according to the present invention, the mold for stuffing a pipe has cooling means and heat insulating or heating means incorporated in the upper mold and the lower mold in accordance with the thickness of each part of the casting, and is far from the gate. Each cooling mechanism is controlled independently so as to operate from the side, and the temperature drop of the bridge portion, which tends to solidify early, is delayed. As a result, a casting having a good shape without casting defects such as a lack of hot water and a casting cavity is cast despite the complicated change in shape and thickness. Further, the pipe to be cast is cooled even during casting, so that it is used as a part of a hydraulic circuit that is free from erosion and oil leakage. Moreover, since the bleeder is accurately held at a predetermined position inside the casting, post-work such as drilling of a bleeder mounting hole becomes easy.

[Brief description of the drawings]

FIG. 1 is a plan view schematically illustrating a caliper body for a brake disc, and FIG.

FIG. 2 is a perspective view illustrating the inside of an upper mold (a) and a lower mold (b).

FIG. 3 is a perspective view showing cooling and heat insulating holes formed on the surfaces of an upper mold (a) and a lower mold (b).

FIG. 4 is a cross-sectional view illustrating a heat insulating means (a) and a cooling means (b, d) in comparison with a conventional cooling means (c).

FIG. 5 is a perspective view (a) and a sectional view (b) of a core.

FIG. 6 shows several examples of a pipe support formed at the tip of a core.

FIGS. 7A and 7B are perspective views of an upper die having a fixing groove into which both ends of the pipe are inserted, and a cross-sectional view illustrating holding of the end of the pipe; FIGS.

FIG. 8A is a perspective view of a lower mold having fixed grooves into which both ends of the pipe are inserted, FIG. 8B is a cross-sectional view showing a relationship between a bent end of the pipe and an edge of the lower mold, and FIG. Sectional view (c) showing a state where the end of the pipe is held between the upper die and the upper die.

FIG. 9 is a mold in which one end of a pipe is supported by an upper mold (a) and the other end is supported by a core (b).

FIG. 10 is an explanatory view of attaching a bleeder to a caliper body casting.

FIG. 11 shows an upper mold (a) having a pipe holding groove and a lower mold (b) incorporating a core (c) having a pipe holding groove.

FIG. 12 Insert one end of the pipe into the insertion hole of the core,
Mold with the other end inserted into the lower hole

FIG. 13 shows an upper die (a) having a pipe holding groove with a projection, and a pipe (b) sandwiched between an upper die and a lower die.

FIG. 14 shows an upper die (a) having a semi-elliptical pipe holding groove and a pipe (b) sandwiched between an upper die and a lower die.

FIG. 15 shows an example in which a groove corresponding to the bending (b) of the pipe is formed in the mold (a), and the fluctuation (c) of the pipe is suppressed.

[Explanation of symbols]

10: Upper die 11: Cavity 15: Depression serving as a gate 20: Lower die 21: Cavity 25: Depression serving as a gate 30, 33: Core 34: Block 35: Supporting part 36: Holes with bottom 41, 51: First Water cooling holes 42, 52: second water cooling holes
43, 53: Mist cooling hole 54: Third water cooling hole
44, 55: heat insulating material filling holes 45, 56: first air cooling holes 46, 57: second air cooling holes 61: heat insulating materials 62, 67: water supply pipes 63, 68:
Tip opening 65: Through hole 66: Cap P: Pipe (stuffed material) Pe: Bend end
w: cooling water

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Yasuhiko Hamano 43-3 Harumi-cho, Tomakomai-shi, Hokkaido Japan Light Metal Co., Ltd. Tomakomai Works (72) Inventor Hiroshi Horikawa 1-34-1 Kambara, Kambara-cho, Anhara-gun, Shizuoka Prefecture (56) References JP-A-7-204780 (JP, A) JP-A 1-237065 (JP, A) JP-A-6-315751 (JP, A) JP 53-93125 (JP, A) JP-A-58-86966 (JP, A) JP-A-4-33292 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) B22D 19/00 B22C 9/06 B22D 27/04 F16D 65/02

Claims (10)

(57) [Claims] 1. A mold for casting a casting in which a pipe constituting a fluid circuit is formed, and a refrigerant supply pipe having an open end.
A feed pipe is inserted into a hole formed in the surface of the mold, and
It has a structure without a refrigerant discharge pipe connected to the hole,
The molten metal injected into the bite is solidified from the side far from the gate.
Cooling means with different functions can be individually controlled.
The mold for the cast-in stuffing provided in the place . 2. One or more heating or heat insulating means are combined.
2. The mold for a cast-in-place pipe according to claim 1, wherein the mold is inserted. 3. A heating or heat insulating means is formed on the mold surface.
With a structure in which a heater or a heat insulating material is inserted into the bottomed hole
Item 3. A mold for assembling a pipe according to Item 2. 4. The mold for casting a pipe according to claim 1, wherein a core is incorporated . 5. The mold according to claim 4, wherein the core is provided with cooling means . 6. A bottomed hole in which a cooling means is formed inside a core.
Having a structure in which a refrigerant supply pipe with an open end is inserted into
Item 6. A mold for assembling a pipe according to Item 5 . 7. A support for holding a pipe to be cast is provided.
The mold for casting a pipe according to any one of claims 1 to 6, wherein the mold is formed in a mold. 8. A support for holding a pipe to be cast is provided.
The mold for casting a pipe according to any one of claims 4 to 6, wherein the mold is formed in a core . 9. A support for holding a pipe to be cast is provided.
It is formed on a mold or core and has at least one of the pipes.
One support is sandwiched between the molds or between the mold and the core.
The mold for stuffing a pipe according to any one of claims 1 to 8, which is fixed by fixing . 10. A method for holding an intermediate portion of a pipe to be cast.
5. A supporting portion for holding and fixing is formed on the core.
The mold for stuffing a pipe according to any one of claims 9 to 9 .