KR101333568B1 - Manufacturing mold and method for pulley - Google Patents

Abstract

The present invention relates to a pulley manufacturing mold and a manufacturing method, by combining two members made of different materials to form a pulley manufacturing mold and a manufacturing method for forming a pulley mounted on the air conditioner of the vehicle.
Pulley manufacturing mold of the present invention, the lower mold is equipped with a lower molding portion for molding the lower shape of the outer ring; An upper mold disposed on an upper portion of the lower mold and having an upper mold formed thereon to form an upper shape of the outer ring; A slider disposed between the lower mold and the upper mold and sliding to form a side shape of the outer ring; It is made, including, but the lower surface of the upper molding portion is a hollow inner ring is inserted into the core is formed to protrude downward, the slider is sliding to form a molten groove by the lower molding portion and the slider, When the upper mold is lowered, the upper portion of the molten groove is closed and the inner ring coupled to the core is disposed to be spaced apart from the lower molding portion and the slider inside the molten groove, and the molten metal is injected into the molten groove. The outer ring is formed integrally with the outer circumferential surface of the inner ring.

Description

Manufacturing mold and method for pulley

The present invention relates to a pulley manufacturing mold and a manufacturing method, by combining two members made of different materials to form a pulley manufacturing mold and a manufacturing method for forming a pulley mounted on the air conditioner of the vehicle.

In general, an air conditioner is installed in an automobile for the purpose of cooling. An air conditioner for a vehicle is composed of an air conditioner compressor (compressor), a condenser, and an evaporator, and the refrigerant is circulated to cool the surrounding air through heat exchange. By entering the interior of the car to achieve a cooling effect.

On the other hand, the air conditioner compressor is a device that compresses the refrigerant circulated in the air conditioner to a high-temperature, high-pressure gas state, it is operated by the engine power of the vehicle.

Specifically, the side of the engine is provided with an engine pulley that rotates in conjunction with an internal crankshaft, the engine pulley is connected to the compressor pulley and the belt.

That is, the power generated by the reciprocating motion of the piston in the engine is transmitted to the engine pulley installed on the side of the crankshaft, and transmits the power to the compressor pulley connected by the belt to generate a driving force.

Patent Publication No. 10-2007-0111617 discloses a mold for manufacturing such a pulley.

1 is a vertical cross-sectional view of a conventional pulley manufacturing mold, Figure 2 is a vertical cross-sectional view of a pulley manufactured by a conventional pulley manufacturing mold.

As shown in FIG. 1, a conventional pulley manufacturing mold includes a forming die 4 and a sleeve 2.

The forming die 4 is composed of a fixed part 42 and a moving part 41 which is disposed on and lifts the upper part of the fixed part 42.

A molten groove 43 is formed between the fixing part 42 and the moving part 41, and an injection hole 44 communicating with the molten groove 43 is formed below the fixing part 42.

The sleeve 2 is disposed below the fixing part 42, and is connected to the injection hole 44 to inject molten metal into the molten groove 43.

Then, the molten metal injected into the molten groove 43 is cooled to form a pulley.

As shown in FIG. 2, the pulley includes an inner ring 124 to which the bearing 10 is coupled to an inner circumferential surface, and outer rings 111 and 112 disposed outside the inner ring 124.

Accordingly, the pulley is rotatably mounted to the compressor by the bearing 10, and the hub 310 is mounted to the pulley and connected to the power shaft of the compressor.

Such a pulley may be formed by melting the iron to form a pulley using the aforementioned pulley manufacturing mold, but when the pulley is formed of iron, the weight becomes heavy.

Accordingly, the pulley may be formed of magnesium alloy to reduce the weight of the pulley. However, when the pulley is formed of magnesium alloy, the inner ring 124 and the bearing 10 of the pulley at a high temperature due to a difference in thermal expansion coefficient with the bearing 10. There is a problem that the bond strength of the outer ring is lost.

In addition, when the pulley is formed of magnesium alloy, there is a problem in that the rigidity is insufficient when the processing of the portion that is fastened to the other member such as the tab hole.

The present invention has been made in view of the above-described problems, and an object thereof is to provide a mold and a manufacturing method of a pulley that can increase the rigidity and rigidity of the bearing while reducing the weight.

Pulley manufacturing mold of the present invention to achieve the above object, the lower mold is equipped with a lower molding portion for molding the lower shape of the outer ring; An upper mold disposed on an upper portion of the lower mold and having an upper mold formed thereon to form an upper shape of the outer ring; A slider disposed between the lower mold and the upper mold and sliding to form a side shape of the outer ring; It is made, including, but the lower surface of the upper molding portion is a hollow inner ring is inserted into the core is formed to protrude downward, the slider is sliding to form a molten groove by the lower molding portion and the slider, When the upper mold is lowered, the upper portion of the molten groove is closed and the inner ring coupled to the core is disposed to be spaced apart from the lower molding portion and the slider inside the molten groove, and the molten metal is injected into the molten groove. The outer ring is integrally formed on the outer circumferential surface of the inner ring.

The inner ring is made of iron, and the outer ring is formed of molten magnesium alloy molten metal.

The slider is composed of a first slider and a second slider disposed in opposite directions with respect to the lower molding part. When the upper mold is raised, the first slider and the second slider slide in a direction away from each other. When the mold is lowered, the first slider and the second slider slide in a direction closer to each other, and grooves for forming a groove shape on the outer circumferential surface of the outer ring respectively on the surfaces facing each other between the first slider and the second slider. Protuberances are formed.

A gate for injecting molten metal into the molten groove is formed in the upper mold, and a gas vent for communicating with the molten groove to discharge the internal gas of the molten groove is formed on a lower surface of the upper molding part. An overflow well is formed in communication with the molten groove, in which the molten metal flows, and the overflow well is formed in a lower direction opposite to the direction in which the gate is disposed about the core.

The gas vent includes: a first exhaust part having one end connected to the molten groove; One end is composed of a second exhaust portion connected to the other end of the first exhaust portion, wherein the second exhaust portion is less than the depth of the first exhaust portion.

Pulley manufacturing method of the present invention, the inner mold is disposed in the upper mold disposed above the lower mold, the inner ring coupling step of coupling the inner ring to the core; A molten groove forming step of forming a molten groove between the lower mold and the slider by sliding the slider disposed between the lower mold and the upper mold when the upper mold equipped with the inner ring descends; A molten metal injection step of injecting molten metal into the molten groove; A molten metal cooling step of forming the outer ring by cooling the molten metal injected into the molten metal groove; A casting separation step of separating the solidified outer ring together with the inner ring when the upper mold is raised after the molten metal is cooled and the slider slides in a direction away from the outer ring; The inner ring is formed inside the molten groove in the forming of the molten groove, and the molten solidifies in the molten cooling step so that the outer ring is integrally formed on the outer circumferential surface of the inner ring.

The inner ring is made of iron, and the outer ring is formed of molten magnesium alloy molten metal.

It further comprises a preheating step of preheating the inner ring prior to the inner ring coupling step.

A plurality of coupling grooves are formed on the outer circumferential surface of the inner ring in contact with the molten metal.

Pulley manufacturing mold and manufacturing method according to the present invention has the following effects.

By injecting inner and outer rings of different materials into the molten groove to form a pulley integrally, it is possible to improve the quality of the pulley by reducing the weight of the pulley to increase the bonding force with the bearing and increase the rigidity and wear resistance.

 In addition, by forming the outer ring of the pulley with magnesium alloy to reduce the weight of the pulley, while the inner ring of the pulley coupled to the inner peripheral surface is made of steel to minimize the difference in the coefficient of thermal expansion with the bearing, it is possible to increase the bonding force with the bearing.

In addition, groove projections are formed on the mutually facing surfaces of the first slider and the second slider that slide together to form the molten groove together with the lower molding part, thereby forming a groove shape on the outer ring to increase the coupling force between the pulley and the belt to increase power transmission performance. Can increase.

In addition, a gas vent is formed at an upper portion of the molten groove, and an overflowwell is formed in a direction opposite to the direction in which the gate is disposed around the core, thereby discharging the internal gas of the molten groove to improve the quality of the outer ring.

In addition, by preheating the inner ring of the pulley before coupling to the core, it is possible to prevent the temperature drop of the upper molding portion to improve the moldability of the pulley.

In addition, by forming a coupling groove in the inner circumferential surface of the inner ring, it is possible to increase the coupling force between the inner ring and the bearing coupled to the inner circumferential surface of the inner ring.

1 is a view showing a conventional pulley manufacturing mold,
2 is a view showing a pulley manufactured by a conventional pulley manufacturing mold;
3 is a perspective view of a pulley manufacturing mold according to an embodiment of the present invention,
4 is an exploded perspective view of a pulley manufacturing mold according to an embodiment of the present invention;
Figure 5 is an exploded perspective view of the other direction of the pulley manufacturing mold according to an embodiment of the present invention,
Fig. 6 is a sectional view taken along line AA of Fig. 3,
7 is a cross-sectional view taken along line BB of FIG.
FIG. 8 is a cross-sectional view illustrating a state in which the upper mold is lifted in FIG. 7 and the slider is slid;
9 is a block diagram showing a pulley manufacturing method according to an embodiment of the present invention;

3 is a perspective view of a pulley manufacturing mold according to an embodiment of the present invention, Figure 4 is an exploded perspective view of a pulley manufacturing mold according to an embodiment of the present invention, Figure 5 is a pulley manufacturing mold according to an embodiment of the present invention Another exploded perspective view, FIG. 6 is a cross-sectional view taken along line AA of FIG. 3, FIG. 7 is a cross-sectional view taken along line BB of FIG. 3, and FIG. 8 is a state in which the upper mold is raised in FIG. It is sectional drawing which shows.

Specifically, FIG. 8 is a state in which the slider slides in a direction away from each other as the upper mold is raised.

Pulley manufacturing mold according to an embodiment of the present invention, as shown in Figure 3 to 8, consists of a lower mold 600, a slider 700 and the upper mold 800.

The pulley manufactured according to the embodiment of the present invention is used for an air conditioner of an automobile, and the inner ring 510 and the outer ring 520 of different metal materials are combined to be integrally formed.

Specifically, the inner ring 510 is made of iron, the outer ring 520 is formed of molten magnesium alloy molten metal.

As shown in FIG. 4, the lower mold 600 is equipped with a lower molding part 610 for molding a lower shape of the outer ring 520.

The lower molding part 610 forms a molten groove 530 to mold the outer ring 520 by injecting molten metal together with the slider 700.

An inflow path 620 is formed at an upper portion of the lower mold 600.

The inflow passage 620 flows the molten metal injected into the upper mold 800 into the molten groove 530.

In detail, as shown in FIG. 6, the inflow path 620 is combined with the gate 830 formed in the upper mold 800 so that the molten metal injected into the gate 830 is passed through the inflow path 620. Flow into the molten groove 530.

In addition, an overflow well 611 is formed on the upper surface of the lower molding part 610 to communicate with the molten metal groove 530 to flow molten metal.

The overflow well 611 is formed in a direction opposite to the direction in which the inflow path 620 is disposed about the molten groove 530, and the molten groove 530 is filled with the molten metal 530. Prevents gas from remaining at the bottom of the

More specific details will be described later together with the slider 700 and the upper mold 800.

And the lower mold 600 is coupled to the ejector 630 to move up and down.

The ejector 630 is coupled to the lower mold 600 such that an upper portion penetrates the lower molding part 610 up and down, and as shown in FIG. 4, the ejector 630 is in the lowered state. The height is disposed to match the height of the upper surface of the lower molding portion 610 protruding upward.

The ejector 630 is raised when the molten metal is solidified in the molten groove 530 and the molding of the outer ring 520 is completed to lift the outer ring 520 upward.

The ejector 630 may be implemented by various applications according to a conventionally known technique.

In addition, the lower molding portion 610 is coupled to the hole pin 640 protruding to the upper portion of the lower molding portion 610 to form a tab hole, etc. in the outer ring 520.

In addition, guide parts 650 are formed at both sides of the lower molding part 610 to be inserted to slide the slider 700.

The guide part 650 has a through hole 651 through which it is vertically penetrated.

An angle pin 820 formed in the upper mold 800 is inserted into the through hole 651.

The slider 700 is disposed between the lower mold 600 and the upper mold 800, slides, and forms a side shape of the outer ring 520.

The slider 700 includes a first slider 710 and a second slider 720 as shown in FIG. 4 or 5.

The first slider 710 and the second slider 720 are respectively inserted into the guide part 650 and disposed in opposite directions with respect to the lower molding part 610.

The first slider 710 and the second slider 720 slide in a direction facing each other to form the molten groove 530 together with the lower molding part 610.

In addition, grooves 730 for forming a groove shape on the outer circumferential surface of the outer ring 520 are protruded from the surfaces of the first slider 710 and the second slider 720 facing each other.

The groove shape formed on the outer circumferential surface of the pulley improves the power transmission performance by increasing friction with the belt.

An angle groove 740 is formed in the first slider 710 and the second slider 720.

In detail, as shown in FIG. 7, the angle grooves 740 respectively formed in the first slider 710 and the second slider 720 are inclined to move away from each other.

An angle pin 820 formed in the upper mold 800 is inserted into the angle groove 740 so that the first slider 710 and the second slider 720 move away from each other when the upper mold 800 rises. And the upper mold 800 is lowered to slide in a direction closer to each other to form the molten groove 530.

As shown in FIG. 5, the upper mold 800 is disposed above the lower mold 600 and is elevated, and the upper mold portion 810 is formed at the lower portion of the upper mold 800 to form the upper shape of the outer ring 520. .

The lifting structure of the upper mold 800 may be implemented according to a general lifting structure known in the art.

The upper mold 800 is lowered to close the upper portion of the molten groove 530.

That is, as described above, when the upper mold 800 descends, the first slider 710 and the second slider 720 slide in a direction facing each other, as shown in FIGS. 6 and 7. 530 is formed, and the upper molding part 810 covers and closes the upper portion of the molten groove 530.

The core 811 to which the hollow inner ring 510 is inserted and coupled is protruded downward from the lower surface of the upper molding part 810.

The inner ring 510 is coupled to the outer circumferential surface in close contact with the outer circumferential surface of the core 811.

The core 811 is disposed at the inner center of the molten groove 530 when the upper mold 800 descends to close the molten groove 530.

Accordingly, the inner ring 510 coupled to the core 811 is disposed to be spaced apart from the lower molding part 610 and the slider 700 in the molten groove 530.

In addition, a gas vent 812 is formed on the bottom surface of the upper molding part 810 so as to communicate with the molten groove 530 and discharge the internal gas of the molten groove 530 as illustrated in FIGS. 5 and 6. do.

A plurality of gas vents 812 are formed around the molten groove 530 and include a first exhaust part 813 and a second exhaust part 814.

The first exhaust part 813 is formed in a rectangular groove shape having a shallow depth, and one end thereof is connected to the molten groove 530.

One end of the second exhaust portion 814 is connected to the other end of the first exhaust portion 813, and a depth thereof is formed to be shallower than the depth of the first exhaust portion 813.

As the molten metal is injected into the molten metal groove 530, gas or the like present in the molten metal groove 530 is discharged to the first exhaust portion 813 and the second exhaust portion 814 by the molten metal. .

When the molten groove 530 is filled with the molten metal, the molten metal flows into the first exhaust part 813 and the molten groove 530 is filled with the molten metal to form the outer ring 520 having a perfect shape. have.

At this time, the molten metal introduced into the first exhaust portion 813 may flow into the second exhaust portion 814, but the depth of the second exhaust portion 814 is the depth of the first exhaust portion 813. It is formed to be shallower so that only the gas is discharged while the molten metal flowing into the first exhaust portion 813 does not flow well into the second exhaust portion 814.

In addition, angle pins 820 protrude from both sides of the upper molding part 810 at a lower portion of the upper mold 800.

As shown in FIG. 7, the angle pins 820 are formed to be separated from each other toward the bottom thereof and inserted into the angle grooves 740 and the through holes 651.

Accordingly, as shown in FIG. 8, when the upper mold 800 rises, the angle pin 820 rises and the first slider 710 and the second slider 720 are moved by the angle pin 820. Sliding in a direction away from each other.

In addition, when the upper mold 800 is lowered, the angle pin 820 is lowered, and the first pin 710 and the second slider 720 are slid by the angle pins 820 to be closer to each other. The molten groove 530 is formed by the lower mold 610, the first slider 710, and the second slider 720, and the upper mold 810 covers and seals the molten groove 530. .

The upper mold 800 has a gate 830 for injecting molten metal into the molten groove 530.

As described above, when the upper mold 800 descends to cover the molten groove 530, the gate 830 is coupled to the inflow path 620 to allow the molten metal to flow through the inflow path 620. 530).

The molten metal injected into the molten groove 530 is filled from the bottom surface of the molten groove 530 and flows into the overflow well 611.

As described above, the overflow well 611 is formed below the molten groove 530 in a direction opposite to the direction in which the inflow path 620 is disposed.

That is, the overflowwell 611 is formed in a direction opposite to the direction in which the gate 830 is disposed around the core 811 as shown in FIG. 6.

Accordingly, the molten metal injected into the gate 830 flows into the molten groove 530 through the inflow path 620.

The molten metal flows from the bottom surface in the inflow path 620 in the direction in which the overflow well 611 is formed.

The molten metal injected into the molten groove 530 pushes the gas inside the molten groove 530.

Accordingly, the internal gas of the molten metal groove 530 is pushed by the molten metal in a direction in which the overflow well 611 is formed, which is the opposite direction to the direction in which the inflow path 620 is disposed around the core 811. .

As the molten metal is filled in the molten groove 530, the molten metal is filled upward. Since the grooves 730 protrude from the slider 700 forming the side surface of the molten metal groove 530, the molten groove ( The internal gas of the 530 is pushed to the lower portion of the groove protrusion 730 formed in the direction in which the overflow well 611 is formed, and the molten metal is filled to the upper portion of the molten groove 530.

At this time, the gas pushed to the lower portion of the groove protrusion 730 may remain in the lower portion of the groove protrusion 730 is not discharged to the upper portion as the molten metal rises upward.

Accordingly, in order to prevent gas from remaining in the lower portion of the groove protrusion 730 formed in a direction opposite to the direction in which the inflow path 620 is disposed, internal gas is discharged to the overflowwell 611 together with the molten metal.

When the inner gas remains in the molten groove 530, a void is formed in the outer ring 520 by the remaining gas during molding of the outer ring 520, thereby degrading the quality of the outer ring 520.

As described above, the gas remaining in the lower portion of the molten groove 530 is discharged to the overflowwell 611 and the remaining gas is discharged to the upper portion of the molten groove 530 to be discharged to the gas vent 812.

As described above, when the molten metal from which residual gas is removed is filled and cooled in the molten groove 530, the outer ring 520 is integrally formed on the outer circumferential surface of the inner ring 510.

Therefore, the outer ring 520 of the pulley is formed of magnesium alloy to reduce the weight of the pulley while the inner ring 510 is made of iron, thereby increasing the bonding force with the bearing and increasing the rigidity and wear resistance.

Hereinafter, a pulley manufacturing method according to an embodiment of the present invention will be described.

9 is a block diagram showing a method for manufacturing a pulley according to an embodiment of the present invention.

As shown in Figure 9, the pulley manufacturing method of the present invention, preheating step (S901), inner ring coupling step (S902), molten groove forming step (S903), melt injection step (S904), melt cooling step (S905) and The casting separation step (S906) is made.

First, the inner ring 510 increases the coupling force with the outer ring 520 by forming a plurality of coupling grooves (not shown) on the outer circumferential surface of the molten groove 530 in contact with the molten metal.

By forming a plurality of coupling grooves on the outer circumferential surface of the inner ring 510, the contact area with the molten metal forming the outer ring 520 is increased to increase the coupling force between the inner ring 510 and the outer ring 520.

The coupling groove may be formed in various shapes.

In addition, the inner ring 510 which is in contact with the molten magnesium alloy molten metal is made of iron, and the surface is plated with zinc / nickel-based metal to prevent potential difference corrosion.

The preheating step S901 preheats the inner ring 510 before inserting the inner ring 510 into the core 811.

As such, by preheating the inner ring 510 to the core 811, the temperature decrease of the upper mold 800 is prevented, thereby improving the formability of the outer ring 520.

In the inner ring coupling step S902, the inner ring 510 is inserted into and coupled to the core 811 in the state where the upper mold 800 is raised.

The core 811 is formed in a cylindrical shape and the inner ring 510 is coupled to and fixed to the core 811 in an interference fit manner.

 The molten groove forming step S903 includes the first slider 710 disposed between the lower mold 600 and the upper mold 800 as the upper mold 800 on which the inner ring 510 is mounted descends. The upper molding part 810 is the molten groove 530 while the second slider 720 slides in a direction facing each other to form the molten groove 530 between the lower mold 600 and the slider 700. Cover the top of the.

In this case, the inner ring 510 is coupled to the core 811 and disposed in the molten groove 530, as shown in FIGS. 6 and 7, and the lower molding part 610 and the slider 700. Spaced apart.

In the molten metal injection step (S904), molten magnesium alloy molten metal is injected into the molten metal groove 530.

Specifically, the molten metal is injected into the gate 830 to fill the molten metal in the molten groove 530 through the inflow path 620.

The molten metal injected into the molten metal groove 530 fills the inside of the molten metal groove 530 and pushes the internal gas of the molten metal groove 530 into the overflowwell 611 and the gas vent 812.

In the molten metal cooling step S905, when the molten metal injected into the molten metal groove 530 completely fills the molten metal groove 530, the molten metal is cooled to form the outer ring 520.

In the molten metal cooling step (S905), the molten metal is solidified so that the outer ring 520 is integrally formed on the outer circumferential surface of the inner ring 510.

The casting separation step S906 separates the outer ring 520 together with the inner ring 510 after the molten metal is cooled and solidified.

Specifically, when the upper mold 800 is raised, the core 811 is separated from the inner ring 510, the slider 700 slides in a direction away from the outer ring 520, and the upper mold 800 is raised. After the ejector 630 is raised, the solidified outer ring 520 is lifted and separated together with the inner ring 510.

The separated pulley is introduced into the overflow well 611 and the gas vent 812 to remove the solidified portion.

And the inner ring 510 and outer ring 520 integrally formed pulley is provided with a separate surface treatment to protect from the external corrosive environment.

Specific surface treatment methods include electrodeposition, anodizing, plasma electrolytic oxide coating, and the like.

Thus, by forming the outer ring 520 formed of magnesium alloy integrally in the inner ring 510 made of iron, it is possible to improve the quality by increasing the rigidity, bonding strength, wear resistance, etc. while reducing the pulley.

The present invention pulley manufacturing mold and manufacturing method is not limited to the above-described embodiment can be carried out in a variety of modifications within the scope of the technical idea of the present invention.

510: inner ring, 520: outer ring, 530: molten groove,
600: lower mold, 610: lower molding part, 611: overflowwell, 620: inflow path, 630: ejector, 640: hole pin, 650: guide part, 651: through hole,
700: slider, 710: first slider, 720: second slider, 730: groove protrusion, 740: angle groove,
800: upper mold, 810: upper molding part, 811: core, 812: gas vent, 813: first exhaust part, 814: second exhaust part, 820: angle pin, 830: gate,
S901: preheating step, S902: inner ring coupling step, S903: molten groove forming step, S904: molten metal injection step, S905: molten metal cooling step, S906: casting separation step,

Claims (9)

In the manufacturing mold of the pulley is formed integrally by combining the inner ring and the outer ring of different metal materials,
A lower mold equipped with a lower molding part for molding the lower shape of the outer ring;
An upper mold disposed on an upper portion of the lower mold and having an upper mold formed thereon to form an upper shape of the outer ring;
A slider disposed between the lower mold and the upper mold and sliding to form a side shape of the outer ring; , ≪ / RTI >
On the lower surface of the upper molding portion, a core in which the hollow inner ring is inserted and coupled is formed to protrude downward;
The slider is slid to form a molten groove by the lower molding part and the slider.
When the upper mold is lowered, the upper portion of the molten groove is closed and the inner ring coupled to the core is disposed to be spaced apart from the lower molding portion and the slider inside the molten groove.
The outer ring is integrally formed on the outer circumferential surface of the inner ring by molten metal injected into the molten groove,
The upper mold is formed with a gate for injecting molten metal into the molten groove,
A gas vent is formed on the lower surface of the upper molding part in communication with the molten groove to discharge the internal gas of the molten groove.
An overflow well is formed on the upper surface of the lower molding part in communication with the molten groove to allow the molten metal to flow therein.
The overflow well is formed in the pulley manufacturing mold, characterized in that the lower portion opposite to the direction in which the gate is disposed around the core. The method according to claim 1,
The inner ring is made of iron, the outer ring is a pulley manufacturing mold, characterized in that formed into molten magnesium alloy molten metal. The method according to claim 1 or 2,
The slider is composed of a first slider and a second slider arranged in opposite directions with respect to the lower molding part,
When the upper mold rises, the first slider and the second slider slide in a direction away from each other,
When the upper mold descends, the first slider and the second slider slide in a direction closer to each other,
Pulley manufacturing mold, characterized in that grooves are formed on the outer circumferential surface of the outer ring to form a groove shape on the surface facing each other of the first slider and the second slider. delete The method according to claim 1,
The gas vent,
A first exhaust portion whose one end is connected to the molten groove;
One end is made of a second exhaust portion connected to the other end of the first exhaust portion,
The second exhaust portion is a pulley manufacturing mold, characterized in that the depth is shallower than the depth of the first exhaust portion. In the manufacturing method of the pulley is formed integrally by combining the inner ring and the outer ring of different metal materials,
A preheating step of preheating the inner ring;
An inner ring coupling step of forming a core downward in the upper mold disposed above the lower mold and coupling the inner ring to the core;
A molten groove forming step of forming a molten groove between the lower mold and the slider by sliding the slider disposed between the lower mold and the upper mold when the upper mold equipped with the inner ring descends;
Injecting the metal molten metal into the molten groove through the gate formed in the upper mold, to flow the molten metal into the overflow well formed to communicate with the molten groove in the lower mold, the gas formed to communicate with the molten groove in the upper mold A molten metal injection step of discharging the gas existing in the molten metal groove as a vent;
A molten metal cooling step of forming the outer ring by cooling the molten metal injected into the molten metal groove;
A casting separation step of separating the solidified outer ring together with the inner ring when the upper mold is raised after the molten metal is cooled and the slider slides in a direction away from the outer ring; , ≪ / RTI >
In the forming of the molten groove, the inner ring is disposed inside the molten groove,
The molten metal is solidified in the molten metal cooling step, characterized in that the outer ring is integrally formed on the outer peripheral surface of the inner ring. The method of claim 6,
Wherein the inner ring is made of iron, the outer ring is a pulley manufacturing method characterized in that it is molded into molten magnesium alloy molten metal. delete The method according to claim 6 or 7,
And a plurality of coupling grooves are formed on an outer circumferential surface of the inner ring in contact with the molten metal.

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