JP4703437B2 - Die casting mold - Google Patents

Description

  The present invention relates to quality improvement by gas suction in die casting.

Conventionally, die casting defects have been mainly caused by hot water baths, seizure bites, burrows, and pressure leaks, and accounted for a large proportion of defects. The following measures have been taken to deal with these major defects and have achieved their results.
Casting machine conditions: In order to speed up the filling of molten aluminum alloy, the injection speed by the piston is increased, the switching position from low speed to high speed is changed, and the timing of pressure increase for crushing is changed.
Casting peripheral conditions: Reduce the amount of gas generated by squeezing the release agent or lubricant, or blow off excess release agent or lubricant by air blow.
Filling / discharging method: The molten aluminum alloy flows in the direction toward the defective part.
: The gas pushed by the hot water flow collects on the mold dividing surface and can be discharged out of the casting.
Mold shape change: By using the burrow part and pressure leakage part as the mold dividing surface, a route for discharging the gas or molten aluminum mixed with gas to the outside of the cast product is secured.
Product shape change: Reduce the volume of the shape by thinning the thick wall to make it thinner and lighter.
: For the boss, etc., reduce the shape volume by setting the cast pin.
: Degassing or molten aluminum alloy is shaped so that it can be discharged to the outside of the die-cast product.
These defect countermeasure methods have a remarkable effect on hot water and hot water boundary defects, and in the countermeasure against defects in seizure bites, burrows and pressure leaks, there was an effect of reducing to a certain defect rate. There were limits that could not be lowered. Therefore, these measures were effective when the allowable delivery failure rate to customers was high and did not exceed the limit of failure measures.
However, customer satisfaction and product liability laws have emerged, and the required quality of customers has been steadily increasing, and the allowable delivery failure rate has continued to decline. In particular, for critical security parts, perfect castings are required. Has reached. Correspondingly, new die-casting methods and die-casting addition technologies have been developed that aim for high quality and achieve a lower defect rate.
Depressurization (low vacuum): Since it is easy to flow the hot water in the pressure reducing direction, the defective portion is depressurized and the hot water flowing direction is increased to increase the filling degree of the molten aluminum alloy.
High vacuum: Seal the piston and mold so that there is no leakage with packing, etc., and increase the degree of vacuum in the product shape space to reduce the amount of gas.
Partial suction: A pin or the like is set up at a defective portion and vacuum suction is performed from the gap (15) to reduce gas. Partial pressurization: A pressurization pin is set up at a burrow or a pressure leaking point, and it is crushed by pressurizing to a pressure level equivalent to forging that can be plastically deformed.
High vacuum + partial pressurization: The burrow defective part remaining even in high vacuum is crushed by partial pressurization.
Although the defect rate has been very low as a result of technological development for quality improvement of these castings, the seizure bites, burrows, and pressure are still among the three major defects excluding the hot water and hot water boundaries. Leakage remained as a problem with a relatively high defect rate.
Die-casting is a production method in which gas is always entrained and mixed for high-speed filling. Therefore, even if these additional technologies are applied and the work standards determined in detail are followed, the defect rate is reduced. There was variation, and it was very difficult to operate with a stable rate below the allowable defect rate. In particular, there is a limit in die casting technology associated with the cast product shape and the rigidity design of the mold, and there is a limit level of countermeasures against defects in which the defect rate does not decrease even with the new die casting method and additional technology.
Even if the defective part (position) occurring in the range of general die casting reaches the limit level even when countermeasures are taken by applying new die casting methods or additional technologies, the defect rate is naturally low, but the remaining defects It becomes a defective part (position) that comes out as.
As shown in FIG. 1, the main portion (position) is thick (1) boss (2) bag shape (3) hot water flow tip (4) (hereinafter referred to as problem shape portion ( 13 )). In addition, due to the reduction in weight, the number of stealing and processing man-hours has been reduced, so that the problem has been limited to locations (positions) where cast pins are raised on the problem shape portion ( 13 ).

Defects in the general thick-walled parts that make up the entire shape of the cast product, except for exceptionally thin-walled cast products, depending on the casting machine conditions, casting peripheral conditions, and replacement plan at the hot water and hot water boundaries that can be selected by appearance inspection It was almost solved.
Therefore, the overwhelming defective part is the thick wall (1) boss (2) bag shape (3) hot water flow tip (4) in the problem shape part ( 13 ). The pressure leak is poor. Further, the cast pin standing on the problem shape portion (13) has been a problem due to seizing and biting in the burrow / pressure leak.
These problem-shaped parts ( 13 ) have much mold release agent and lubricant in contact with the mold temperature and molten aluminum alloy, and gas that has evaporated, pyrolyzed and burned and air remaining in the product space. As a defect that cannot be crushed by the casting pressure and pressure increase under the casting conditions, the burrow and the pressure leakage are defective. In particular, there is a cast pin or the like in the problem shape part ( 13 ), and the cast pin part is hard to form a release film because the sprayed mist release agent is difficult to adhere. Defects occur. In this case, in order to form a release film, more release agent or lubricant is applied, so that the release agent or lubricant excessively adheres to the mold surface, increasing the amount of gas generated, The mold release agent and lubricant are entrained as waste. In addition, water droplets that dilute the mold release agent are likely to remain in these defective parts, evaporate in contact with the mold temperature or molten aluminum alloy, and become extremely large water vapor volume, causing burrows and pressure leaks. It is a cause that is easy to cause.

For these reasons, it is possible to further reduce defects by stably removing as much gas and debris as possible in the problem shape portion ( 13 ).
These requirements for defect countermeasures are:
(A) An appropriate release film can be formed with the minimum spray amount of the release agent.
(B) Eliminate residual water droplets and water residue.
(C) Reduce the amount of gas generated.
(D) Remove the deposit with an excessive mold release agent or repeated shots.
(E) Reduce combustion gas from plunger lubricant.
It becomes.
In addition, it is necessary to reduce the defective rate of castings delivered to customers and avoid lot-outs. For this reason, since there is variation in die casting, it is necessary to reduce the defect rate and at the same time keep the variation very low.
(F) Suppresses variations in low average defect rate and defect rate.
The variation is caused by variations in casting conditions. However, because the amount of unstable generated gas and the entrained gas are compressible, the discharge and pressurization do not become uniform, resulting in variations.
The present invention reliably and uniformly removes the above-mentioned problems (a) to (f), thereby limiting the limit of defect countermeasures by general die casting, new die casting method, and additional technology to a lower defect rate. Is.

Conventionally, if the vacuum space or partial suction is applied to the mold space side of the cast product after clamping, using the additional technology, the amount of reduced gas (c) (e) and the effect of gas reduction (f) The effect of reducing the variation of the was obtained. However, because the requirements of (i), (b), and (d) are not satisfied, there was a limit in reducing the defective rate.
The present invention makes it possible to remove the requirements (a) to (f) of the problem shape part ( 13 ) subjected to general die casting or additional technology, and to further reduce the defect rate.
For this purpose, the slide moves forward to the problem shape part ( 13 ) after opening the mold, moves back and forth to the cast product shape position before clamping, and can be sucked in a vacuum until the molten aluminum alloy is filled. A suction pin (9) or a slide cast suction pin (7) is installed.
Specifically, in the case of the problem shape portion ( 13 ) without the cast pin, the slite suction pin (9) and the extrusion A plate (10) and the extrusion B are the same as the normal extrusion pin as shown in ( FIG. 3 ) . Connect to the plate (11).
After the mold is opened, when the cast product is pushed out and taken out, the slide suction pin (9) moves forward to a protruding state so that the suction groove (8) appears from the shape of the cast product of the mold. As shown in FIG. 2, the suction groove (8) whose side surface is cut or grooved is connected to the suction path (12) which is opened larger than the slide suction pin (9), and an O-ring ( It connects with the suction port (22) provided in the suction board (21) sealed by 20) .
A vacuum hose (18) connected to the suction port (22) is connected to a reduced-pressure vacuum tank (19) and directly sucked by suction under reduced pressure.
The type and size of the vacuum pump can be determined by the vacuum level and suction capacity set in the vacuum tank (19) .
Extruding after mold opening, the slide suction pin (9) sprays the diluted release agent from the nozzle (14) in a mist state while sucking under reduced pressure from the suction groove (8) in the protruding state . While the mist flows and contacts and adheres to the mold and pin surface to form a release film, excess mist is sucked into the suction groove (8), and the entire release film is efficiently applied with a minimum amount. By forming (a), an appropriate release film can be formed with the minimum spray amount of the release agent. As a result, the mist does not enter into the inside as in the conventional case, and the adhesion is not uneven and there is no portion where the release agent is excessively adhered, and a substantially uniform release film can be formed.
Even after the stopped spray from the nozzle (14) of the release agent, so to continue the decompression vacuum suction by the Eyapuro effect by Eya the passage (b) water droplets, residual water and (c) adhering a release The amount of gas generated from the agent can also be removed by suctioning the mold release agent that adheres excessively and becomes the source of deposition.
In the case of the current situation where vacuum suction is not performed, the spray air turns up and the back pressure causes uneven adhesion, and if the spray is excessive for the non-adhered part, the general thickness and the connection part of the problem shape part ( 13 ) The release agent adhered excessively to the general wall thickness side, and a uniform release film could not be formed.
When the pull-back operation is performed while continuing the vacuum suction , the extrusion A plate (10) and the extrusion B plate (11) are retracted, and the slide suction pin (9) has the shape of a cast product while excessive release agent or adhering water droplets are sucked . It is pulled back to a predetermined position.
Furthermore, since the suction under reduced pressure is continued, gas and debris accumulated at the side of the gap (15) can be sucked from the gap (15) between the slide suction pin (9) and the mold. In addition, when the molten aluminum alloy is filled by injection, the combustion gas of the plunger lubricant that enters in advance is also sucked in the space near the problem shape portion ( 13 ) under reduced pressure and further reduced to a negative pressure. As a result, a hot water flow is generated, the filling amount increases, and the gas amount also decreases.
Since the amount of gas is reduced to a constant negative pressure, changes due to unstable gas behavior are reduced, and (f) variation in the defective rate is also reduced.
Conventionally, the partial suction of the additional technology does not move the pin back and forth, so if a vacuum is created by creating a gap between the pin and the mold, the molten aluminum alloy will soak in the gap of 0.05 mm, clogging the burr, and a gap of 0.03 mm Then, wax or silicone that becomes solid or highly viscous in the mold release agent was deposited, and the suction effect was lost.
The slide suction pin (9) moves forward when the mold is opened and protrudes from the surface of the mold, so that burr, wax or silicone can be blown off and sucked during application of the release agent or after air blow. ) Is eliminated and a stable and constant amount of vacuum suction is obtained.
Since the pressure setting of the vacuum vacuum tank (19) is made constant and the suction port (22) is connected, the suction amount by the vacuum suction is also constant, and the variation due to the residual gas / generated gas is also constant.

When there are few problem shape parts (13), such as 1-2 places, or when it is on the fixed mold side of the mold, a slide suction pin (9) or a slide cast suction pin (7) installed at a required position A small cylinder is set at the rear end to move back and forth.
In the case of partial pressure setting, the suction groove (8) is carved into the partial pressure pin and connected to the suction path (12), the suction disk (21), and the vacuum vacuum tank (19). By increasing the cylinder's advance distance, partial pressure + vacuum suction is achieved.

If there are many locations (positions) of the problem shape part (13) with the punch pin, it will be impossible to set many cylinders because the space for the mold structure is small.
In this case, extrusion A plate (10) and the extrusion B plate (11) back to the provided extrusion auxiliary plate (24) of the through the same suction plate as described above (21) Extrusion A plate (10) Extrusion B plate (11) The rear end noodles of the slide cast suction pin (7) with the cast pin portion thus made are brought into contact with the extrusion auxiliary plate (24). After the mold opening, the extrusion rod (29) begins to extrude the casting, and when the first stage extrusion is advanced by a certain distance, it is attached to the extrusion B plate (11) extrusion auxiliary plate (24) mold back plate (23) At the same time as the cam lock is released, the auxiliary plate stopper (25) comes into contact with the nesting (16) main mold (17) or the slide cast suction pin (7) against the suction disc (21), and the extrusion auxiliary plate (24) stops. At this point, the casting has been removed from the mold by the amount of the first-stage extrusion, but the casting portion of the slide casting suction pin (7) is not removed, and the suction groove (8) is removed from the mold. Appears and stops.
Further, since the slide casting suction pin (7) is stopped when the second stage of extrusion is performed, the entire cast product is pulled out.
When the mold is clamped, the return pin (27) hits the fixed mold, but when the extrusion for the second stage is returned by the push rod (29), the cam lock is locked and the push auxiliary plate (24) is connected to the original cast product. Return to shape position.

Extrusion suction groove after mold opening (8) from the mold surface up to a little out appear to convex, to advance the slide suction pin (9) or a slide casting removal suction pin (7), separated by suction state by the pressure reduction vacuum spray mold agent, back into position at the mold clamping and extrusion pullback and the cylinder, likewise by the leave the molten aluminum alloy at a high vacuum suction state, problems shaped portion of the gas and debris (13) It sucks out or sucks to a negative pressure to reduce the defective rate.

  Examples of the present invention will be described below.

Comparative Example 1
Die-casting machine 500ton × 1 piece Cast name Manifold / Lower
Cast product characteristics: The casting area is large and the casting pressure is set to a low value of 60 MPa.
Nest hole defect rate 3.8% {Casting pin (5) x 3 locations}
Hot water bath 6.1% {Cutting water tip (4) x 2 locations}
Pressure leakage failure rate 2.5% {Pressure leakage position is the same as defective position}
Total defective rate 12.4% (6-month average)
Variation 18.1%
(Minimum defect rate 5.2% to maximum defect rate 23.3%)

In the cast product of Comparative Example 1, three slide punched suction pins (7) are set up in the burrow defective portion of the problem shape portion (13), and overflow (5) at the tip of the molten metal flow tip (4). And two slide suction pins (9) were set up. For the back-and-forth operation of the slide cast suction pin (7) and the slide suction pin (9), an extrusion assisting plate (24) provided with a cam lock was used.
The set pressure of the vacuum tank (19) was set to 0.07 MPa, and the amount of release agent and lubricant used was reduced under casting peripheral conditions.
      Nest hole defect rate 0.3%
      Rate of defective hot water 1.4%
      Pressure leak failure rate 0.66%
      Total defective rate 2.36% {2 months average}
      Variation 2.35%
                        (Minimum defect rate 0.53% to maximum defect rate 3.48%)
  Since the casting area was large, the burrs rarely jumped out of the mold dividing surface, so the casting pressure was further reduced to 50 MPa where the burrs did not pop out.
      Nest hole defect rate 0.4%
      Poor hot water rate 1.2%
      Pressure leak failure rate 0.59%
      Total defective rate 2.19% (The pressure loss due to burr jump was good)
      Variation 2.11%
                        (Minimum defect rate 0.42% to maximum defect rate 2.53%)

Comparative Example 2
Die-casting machine 350ton x 2 pieces Cast name Fast and reverse brake piston Cast feature: The cast product tends to collect burrows at the center of the wall thickness. There is deep grooving with O-ring.
Bath boundary failure rate 1.1%
Poor hot water rate 2.5%
Nest hole defect rate 6.6%
Pressure leak failure rate 2.1%
Total defect rate 10.2% {6 months average}
Variation 16.7%
(Minimum defect rate 4.6% to maximum defect rate 21.3%)

The four extruding pins on the overflow installed near the defective part of the casting of Comparative Example 2 were replaced with the slide suction pin (9) and connected to the vacuum tank (19) from the suction disk (21). The back end of the slide suction pin (9) was moved back and forth between the extrusion A plate (10) and the extrusion B plate (11) in the same manner as the extrusion pin.
The vacuum tank (16) was set to 0.07 MPa.
Poor hot water failure rate 0.0% {No longer available. }
Defect rate of hot water 0.6%
Nest hole defect rate 1.2%
Pressure leak failure rate 0.0%
Total defective rate 1.8% (3 months average)
Variation 2.4%
(Minimum defect rate 0.4% to maximum defect rate 2.7%)

Comparative Example 3
Die-casting machine 350TON x 2 pieces Casting product name Fork gear shift Casting product feature: Casting material is a special hot water bath boundary and 16% high silicon material that tends to generate burrows. The burrow is crushed with pressure.
The percentage of defective hot water baths is 3.6%
Nest hole defect rate 5.1%
Total defective rate 8.7% (12-month average)
Variation 10.5%
(Minimum defect rate: 4.3% to maximum defect rate: 14.8%)

Comparative Example 3 The forward movement of the squeeze pin for partial pressurization of the cast product was made so that the operating distance of the skew cylinder was increased so that it protruded more convexly than the skewed distance, and the suction groove (8) protruded from the mold surface. It is provided so as to be connected to the suction path (12) and the suction disk (21).
When the mold was opened, suction was possible from the defective part of the burrow, so that the mold release agent under the casting peripheral condition was not required excessively, and the spray amount could be reduced to about １ ／ in the defective part of the burrow.
The vacuum tank (16) was set to 0.05 MPa.
The rate of poor hot water bath boundary 1.3%
Nest hole defect rate 0.4%
Total defective rate 1.7%
Variation 2.1%
(Minimum defect rate 0.5% to maximum defect rate 2.6%)

Comparative Example 4
Casting machine 350TON × 2 pieces Cast name Floppy disk cover Product general wall thickness 1.8mm This is a cast product that is very thin and difficult to mold, and requires dimensional accuracy without processing.
At the start, the total defective rate of hot water + hot water border + hot water was over 60%, but the hot water was not defective.
It was difficult to drop from the average failure rate of 23%.

The replacement method, casting conditions, etc. were left as they were, and the overflow (5) 6 extrusion pins were made into the slide suction pins (9), and the extrusion A plate (10) and the extrusion B plate (11) were moved back and forth.
Set pressure of vacuum tank (17) 0.07MPa
Poor hot water rate 0% (disappeared and disappeared)
Hot water defect rate 5.6%
Thickness of the part where many hot metal defects occur in the product shape is 2.0 mm. Replacement method enlarges the hot water flow direction and gas discharge cross-sectional area. Increases the injection speed in casting conditions and uses the release agent spray amount and lubricant. After taking measures to reduce the amount, the setting level of the vacuum vacuum tank (19) was changed.
When the vacuum is 0.07 MPa, the rate of hot water failure 2.26%
When the vacuum is 0.05 MPa, the rate of defective hot water 0.92%
When the vacuum is 0.03MPa, the rate of defective hot water 1.34%
When the set pressure of the reduced-pressure vacuum tank (19) is about 0.05 MPa as a boundary, the point of time when the suction rate is increased by returning from the mold dividing surface is raised.

Since the main causes of burrow defects and pressure leak defects occurring in the problem shape part ( 13 ) are gas, water, and residue, the problem is sucked directly from the problem shape part ( 13 ), so the defect rate is drastically reduced. . For this reason, the variation was reduced, and a stable defect rate was obtained, and complaints from customers were eliminated.
In addition, since the debris accumulated in the same portion can be sucked, the accumulation of debris is also reduced, so that the time required for preparing the mold is increased, the time for continuous production is increased, and the productivity is improved.
The life of the mold is extended because the influence of the gas on the mold surface is reduced by suction, and heat cracks and seizure biting are less likely to occur.
Since the number of gas molecules is reduced, the burrows are crushed by lower casting pressurization .

It is sectional drawing of the problem shape part of a casting. It is a figure containing the cross section of a slide cast suction pin and a problem shape part. It is a perspective view including a partial cross section of a slide suction pin and a mold structure. It is a perspective view including a partial cross section of a slide cast suction pin and a mold structure.

DESCRIPTION OF SYMBOLS 1 Thick wall 2 Boss 3 Bag shape 4 Molten metal flow tip 5 Overflow 6 Casting shape part 7 Slide casting suction pin 8 Suction groove 9 Slide suction pin 10 Extrusion A board 11 Extrusion B board 12 Suction path 13 Problem shape part 14 Nozzle 15 Gap 16 Nest 17 Main mold 18 Vacuum hose 19 Depressurized vacuum tank 20 O-ring 21 Suction board 22 Suction port 23 Mold back plate 24 Auxiliary extrusion plate 25 Auxiliary plate stopper 26 Extrusion pin 27 Return pin 28 Cam lock 29 Extrusion rod

Claims (2)

  In a die casting mold having a fixed mold, a main mold, and a mold surface which is formed on a mating surface of the fixed mold and the main mold and is filled with molten metal to form a cast product,
  A nesting for forming a mold surface is provided on the mold dividing surface side of the main mold, and an extrusion plate is provided apart from the main mold on the back surface side of the main mold.
  A plurality of extrusion pins that slidably penetrate the main mold and the insert are attached to the extrusion plate,
  A slide suction pin that slidably penetrates the main mold and the insert is attached to the extrusion plate,
  A suction disk through which the slide suction pin slidably penetrates is provided in the main mold on the joint surface side of the main mold and the insert, and the main mold, the insert and the suction disk are slid on the slide suction pin. Forming a suction groove in the longitudinal direction of the side of the moving part,
  The suction disk is provided with a suction path so as to communicate with the suction groove on the outer periphery of the slide suction pin, and a suction port is formed in communication with the suction path. The opening of the suction port is connected to a vacuum tank or vacuum pump with a vacuum hose,
  The extrusion pin slides inside the main mold and the nesting by the advancement of the extrusion plate toward the mold surface and the reverse movement, and the slide suction pin is the main mold, the nesting and the suction. The tip of each of the extrusion pin and the slide suction pin protrudes from the mold surface when it moves forward, pushes the cast product from the mold surface, and retreats when the mold is clamped. The tip of each of the push pin and the slide suction pin is located on the same surface as the mold surface, and the suction groove communicates with the suction path when the slide suction pin advances and the mold surface In communication with the slide suction pin, when the slide suction pin is retracted, it is formed so as to communicate with the suction path and not communicate with the mold surface,
  After the die casting mold is opened, the extrusion pin and the slide suction pin move forward to push out the cast product, and when the slide suction pin moves forward, the suction groove protrudes from the mold surface and the mold surface. A die-casting die which is formed so as to communicate with the reduced pressure vacuum tank or the reduced pressure vacuum pump from the suction groove through the suction path and the suction port so as to perform vacuum suction from the mold surface. Type.   In a die casting mold having a fixed mold, a main mold, and a mold surface which is formed on a mating surface of the fixed mold and the main mold and is filled with molten metal to form a cast product,
  A nesting for forming the mold surface is provided on the mold dividing surface side of the main mold, an extrusion plate is provided on the back side of the main mold apart from the main mold, and an extrusion auxiliary plate is provided on the back side of the extrusion plate. The extrusion auxiliary plate and the extrusion plate are detachably engaged by a cam lock,
  An auxiliary plate stopper is provided so as to penetrate the extrusion plate and come into contact with the extrusion auxiliary plate.
  A plurality of extrusion pins that slidably penetrate the main mold and the insert are attached to the extrusion plate,
  A slide cast suction pin that slidably penetrates the main mold, the insert and the extrusion plate is provided so as to be able to contact the extrusion auxiliary plate,
  A suction disk through which the slide casting suction pin slidably penetrates is provided in the main mold on the joint surface side of the main mold and the nesting, and the main mold, the nesting, and the above are provided in the slide casting suction pin. A suction groove is formed in the longitudinal direction of the side surface of the sliding part with the suction disk,
  The suction plate is provided with a suction path so as to communicate with the outer periphery of the slide cast suction pin so as to face the suction groove, and a suction port is formed in communication with the suction path. Open to the outer surface of the main mold, the suction port opening is connected to a vacuum tank or vacuum pump with a vacuum hose,
  By the advancement of the extrusion plate and the extrusion auxiliary plate toward the mold surface side and the reverse movement in the reverse direction, the extrusion pin slides inside the main die and the insert, and the slide casting suction pin is the main die. When sliding the inside of the mold, the insert and the suction disk, and the tips of the extrusion pin and the slide casting suction pin are advanced, the tip protrudes from the mold surface to extrude the cast product from the mold surface. When the mold is clamped, the tip of the extruding pin is positioned on the same surface as the mold surface, and the tip of the slide cast suction pin is positioned so as to protrude from the mold surface.
  The suction groove communicates with the suction path before the extrusion auxiliary plate and the extrusion plate advance to a predetermined position and the cam lock is released, and communicates with the mold surface so that the slide cast suction pin moves backward. Is formed so as to communicate with the suction path and not communicate with the mold surface,
  After the die casting mold is opened, the extrusion auxiliary plate and the extrusion plate are advanced to a predetermined position, and the cast product is extruded from the mold surface with the extrusion pin and the slide casting suction pin, and the cam lock is released. The extrusion plate is separated from the extrusion auxiliary plate, the auxiliary plate stopper comes into contact with the main mold, the extrusion auxiliary plate stops moving forward, the extrusion plate moves forward, and the slide cast suction pin remains as it is. Then, the extrusion pin extrudes the cast product, removes the cast product from the tip of the slide casting suction pin,
  When the slide casting suction pin moves forward, the suction groove communicates with the mold surface, and communicates from the suction groove to the reduced-pressure vacuum tank or the reduced-pressure vacuum pump via the suction path and the suction port. A die-casting die formed so as to be sucked under reduced pressure from the surface of the die.

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