Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B22—CASTING; POWDER METALLURGY
  • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
  • B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
  • B22D27/09—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting by using pressure
  • B22D27/11—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting by using pressure making use of mechanical pressing devices
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B22—CASTING; POWDER METALLURGY
  • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
  • B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B22—CASTING; POWDER METALLURGY
  • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
  • B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
  • B22D17/08—Cold chamber machines, i.e. with unheated press chamber into which molten metal is ladled
  • B22D17/10—Cold chamber machines, i.e. with unheated press chamber into which molten metal is ladled with horizontal press motion
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B22—CASTING; POWDER METALLURGY
  • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
  • B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
  • B22D17/20—Accessories: Details
  • B22D17/32—Controlling equipment

Definitions

• the present invention relates to a die casting method.] More specifically, the present invention relates to a method in which molten metal is discharged from a discharge passage into a mold space for product binding.
• the pressurized plunger also pressurizes the molten metal filled in the mold space from the pressurized passage that communicates with the mold space at a position different from the outlet passage. It relates to the die-storage method described above.
• the molten metal in the pressurized passage that is pushed out by the advance of the pressurized plunger 36 is once pressurized.
• the present inventor actually pushes the molten metal in the pressurized passage into the mold space while forming an enlarged flow, thereby using a method to actually remove the die cast. At the same time, it was possible to force the molten metal into the pressure passage with a stable pressure.
• the diecastrolo C manufactured using this method has the strength and workability of the solidified part of the mold space near the part that communicates with the pressurized passage. Was found to be inferior.
• the present invention has been emplaced in view of the above-mentioned research results, and is a pressurized passage.])
• the molten metal forms an -expanded flow.
• space Die cast product solidified in the inside ⁇
• the die cast product is actually The purpose is to maximize the quality of the city to be used and to enjoy it.
• the movable mold is brought into contact with the fixed mold, and the molten metal is discharged into the mold space for product production and the mold space, and a different position from the discharge passage and the discharge passage. And forming a pressurized passage communicating with the mold space in the first step.
• the fourth step is to release the hot water from the pressurized passage.
• the movable mold is fixed.]? The fifth step of separating the solidified dies in the mold space ejection passage and the pressurized passage.
• the pressurized passage! the part almost opposite to the pressurized passage.
• the holes or grooves formed as a result of the removal are used as part of the product shape because they are removed in the direction of travel of the ranger. It has an excellent effect when it can be done.
• FIG. 1 is a cross-sectional view showing the main parts of the device used for the conventional die-cut method
• Fig. 2 is the device used for carrying out the present invention method
• 3 and 4 show the pressurizing passage 17, the mold space 30, and the basin 32 shown in FIG. 2, respectively.
• Fig. 3 is a cross-sectional view. Is the most retracted state
• FIG. 4 shows the state in which the pressure plunger 36 has advanced the most.
• FIG. 5 is a cross-sectional view for explaining the solidified layer ⁇ generated in the pressurized passage 17 and the like
• FIG. 6 is a diagram of the device shown in FIG. 1.
• Fig. 7 is a side view of Fig. 6, Fig.
• FIG. 8 is a reference photograph showing the structure of a die-formed product with surface defects
• Fig. 9 is a die with segregation
• Fig. 10 is a reference photo showing the structure of the product manufactured by the method of the present invention.
• 6 Form of Saigon for carrying out the invention
• the method of the present invention will not be described for the embodiment of Sagami, but the apparatus used for carrying out the present invention will be described in the embodiment shown in the figure.
• 1 is a fixing stand for the equipment, which is fixed on the floor of the factory via an embedded bolt (not shown).
• Reference numerals 2 and 3 denote projection cylinder holders fixed to the fixed channel ⁇ 1, which hold the projection cylinder 4 fixedly.
• the projection piston 5 On the cylindrical inner surface 4 a of the projection cylinder 4, the projection piston 5 is held in a sliding position, and openings D are provided at both ends of the projection cylinder 4. In response to the hydraulic pressure of the first and second signal hydraulic pipes 6, 7), the ejection piston 5 can be displaced in the ejection cylinder 4 in the left and right directions in the figure. It is about.
• one of the first and second signal hydraulic pipes 6 and 7 is selectively supplied, and is pushed by the discharge piston 5.
• the discharged oil in the discharge cylinder 4 is the signal pressure on the side to which the signal pressure is not supplied. If. 6,
• 1 1 is the 1st signal hydraulic pump. 6
• the hydraulic pressure in the first signal pipe 6 is increased to a predetermined pressure (for example, with respect to the maximum value of the ejection pressure described later).
• the projection head After the side of 14, the projection head. It is provided at a position where it opens when the flange 13 is retracted most (the state shown in FIG. 2).
• the aluminum melter shown in FIG. Molten alloys, magnesium alloys, zinc alloys, and other molten metals are supplied from the hot water supply port 15 into the injection sleeve 14.
• the discharge sleeve 14 covers a part of the discharge passage of the molten metal.
• two fastening rods 2.2.22 are fixed to both sides below the fixed support 16 at J] ?, and the fastening rods 22 penetrate the movable support 23. are doing .
• the movable support 23 is supported by the tightening rods 22 in a tight and slidable state so that the movable support 23 can slide on the fixed base 1 in the left and right directions in the figure. It can be displaced by the driving force of a piston that does not work.
• the movable support 23 has a side clamp plate 24! :
• the movable type 26 is fixed via the lower clamping plates 25, 25.
• the movable type 26 is also fixed in the same manner as the fixed type 18 described above. It is formed by connecting a movable block 27 made of iron (-FGD55) and a movable core 28 made of hot tool steel (SKD61) with a bolt 29. ing .
• the movable support 23 is displaced by the driving force of the piston, so that the movable mold 26 is brought into close contact with the fixed mold 18, and this is fixed.
• the two molds 18, 26 are the products of the company, and the mold space 30, the ejection passage 31 for injecting the molten metal into the mold space 30, and the ejection passage 31.
• the joint surface between the fixed mold 18 and the movable mold 26 is formed. At the specified location, there is a gap of about 0.1 Fiber from 0.1 recommended car, and it is pushed out by the molten metal that has been discharged from the discharge passage 31.
• An air vent 33 for allowing air in the mold space 30 to escape is formed.
• the gate on the mold space 30 side of the discharge passage 31 is a gate 34 to narrow down the passage, and the molten metal supplied from the discharge passage 31 is formed at a high speed. As a result, it is projected into the mold space 30.
• Reference numeral 35 denotes a pressurized sleeve which is press-fitted and fixed to the center of the movable core 28 so as to face a position substantially at the center of the mold space 30.
• (SKD 61) is formed into a cylindrical shape.
• a pressurized plunger 36 made of hot-rolled steel (SKD61) is inserted so as to be tightly slidable.
• the pressurizing passage 17 is formed from the inner surface of the pressurizing sleeve 35 to the end face of the pressurizing bridge 36 by the space on the forward side of D. ing .
• the pressurized plunger 36 is composed of two materials 36a and 36b. For maintenance, only the part that slides inside the pressurized sleeve 35 must be replaced. These two materials 36a and 36b are connected by a connecting ring 37.
• Figs. 3 and 4 show the pressure sleeve 35, the tip of the pressure planer 36 and the water reservoir 32, respectively.
• a small amount of S-suspension (0.05 to 1.00) was found on the tip side of the inner peripheral surface of the pressurized sleeve 35 as compared with other cases.
• a large diameter city 35a is formed.9)
• the pressure plunger 36 is pressed, the molten metal filled in the pressure passage 17
• the film of the solidified layer formed on the outer surface becomes a ring-shaped barrier A, enters the large-diameter portion 35a, and pressurizes through the barrier A.
• the jaw 36 slides on the inner peripheral surface of the pressurized sleeve 35.
• the length y of the large-diameter portion 35a is determined based on the amount of hot water supplied by the pressurizing plunger.]),
• the pressurizing plunger 36 Is the most retracted position 35b (the state shown in Fig. 3) more than a predetermined amount X (less than 10 ⁇ , preferably 2 or 3 hires) Forward point 3 5) It is desirable that the length of the sleeve 35 be up to 35d.
• the length y of the large-diameter portion 35a is changed from the last retreat position 35b of the pressurized plunger 36 to the retreat side to the tip 35d. Even so, there is no problem.
• the displacement of the pressure plunger 36 does not change even at the position 35 e (the state shown in FIG. 4) where the plunger has been advanced.
• c is a displacement that does not protrude beyond the tip 35d of the pressurized sleeve 35, and the pressurized bridge 36 is an annealed hot water tank! ) It is possible to penetrate the city 32 and hopefully it will be better. However, if it is small, even if it protrudes from the pressurized flange tip 36c or the pressurized sleeve tip 35d5, there is no problem in practical use. It recognized .
• the hot water reservoir 32 is a portion of the mold space 30 Q that is cut in a sixth step described later, and actually faces the pressurizing passage 17 after the mold space 30.
• Part D the size is such that it has a cross-sectional area of about twice the cross-sectional area of the pressure passage 17 over the entire space height of the mold space 30.
• Reference numeral 38 denotes a pressurizing piston provided on the rear end side of the pressurizing plunger 36, which slides in the pressurizing cylinder 39 to pressurize the plunger.
• the forward and backward displacements are reported to 36.
• the third and fourth signal hydraulic pipes 40 and 41 are opened to the pressurized cylinder 39 in the same manner as the ejection cylinder 4, and the hydraulic switching valve made of a solenoid valve is opened.
• the hydraulic pump (not shown) is driven by the knob 42.] 3
• the input and output hydraulic pressures are controlled to move the pressurized piston 38 forward and backward. It has become.
• the pressure cylinder 39 is fixed to the side tightening plate 25 by the bolt 43, and moves integrally with the movable mold 26. I'm sorry.
• reference numeral 44 passes through the movable block 27 and the movable core 28, and the tip of the end faces the surface of the movable core 28 and the D-shaped space 30.
• the die-cast product solidified in the mold space 30 is removed from the movable mold 26. 5 Press and release. ] ?, via the ejector plate 45, the extruding load 46, the extruding plate 47, and the extruding rod 48.
• the push-out piston 49 In response to the displacement of the push-out piston 49, it is displaced left and right in FIG.
• the left end of the push-out rod 46 is slidably inserted into a sliding hole (not shown) provided in the movable block 27].
• the extruding cylinder for displacing the extruding piston 49, similarly to the extruding cylinder 4 and the pressure cylinder 39.
• the 5th and 6th signal hydraulic pipes 51 and 52 are open.] 9
• the signal pressure input from a hydraulic pump (not shown) is used to change the hydraulic switching valve made of a solenoid valve.
• this pressurization °
• the movement start time of the flange 36 is controlled by ⁇ . Immediately, the injection of molten metal into the mold space 30 and the pressurized passage 17 is completed.
• a die casting device such as a groove forming device
• the pressurized plunger 36 starts to move forward in a sufficiently short time compared to the time required to complete the solidification of the molten metal in the mouth 34.
• the tap water is used.
• the amount required for this riser is simply the amount corresponding to the solidification shrinkage of the molten metal filled in the mold space 30 and the pressurized passage 17. Not only until the gate 34 completes solidification, but the molten metal filled in the outlet passage 31 and the outlet sleeve 14 solidifies and shrinks. The amount is actually necessary.
• the pressure required for this hot water should be such that at least the molten metal ⁇ filled in the pressurizing passage 17 is pushed into the water reservoir section 32. D, this minimum pressure is required to advance the pressurized flange 36 more than the discharge pressure applied by the discharge flange 13.
• the sliding resistance between ⁇ (illustrated in FIG. 5) of the pressurized passage 17 and the inner wall of the pressurized sleeve 35 and the inner periphery of the pressurized sleeve 35 It is necessary to increase the pressure by the amount of resistance associated with the shear deformation of the solidified layer ⁇ generated at the tip 35 d position.
• the maximum applied pressure is the maximum pressure within a range where the ejection bridge 13 is not pushed back.9
• the actual pressure is applied to the ejection bracket 13.
• the pressure applied is from the pressurized plunger 36] 9
• the applied pressure P a -D is subtracted from the pressure drop ⁇ P generated when the molten metal passes through the gate 34 etc.
• the amount of hot water and the pressing force are determined within the range described in ii.
• the shape of the mold space 30 is determined.
• the cross-sectional area in the direction perpendicular to the direction of travel of the pressurizing plunger 36 is the cross-sectional area of the inner surface of the pressurizing sleeve 35. Because of this, it is possible to always obtain the applied pressure of]?
• the pressurized plunger 36 advances, the molten metal in the pressurizing passage 17 expands, while the mold space 30 (water pool part 3 2) side extends.
• the pressure generated by the presence of the solidified layer ⁇ when moving forward depends on the solidified layer ⁇ and the pressure Only the sliding friction resistance between the inner surface of the sleeve 35 and the force required for shearing the solidified layer generated at the inner peripheral tip 35 d of the pressurized sleeve 35 is obtained.
• the sliding friction resistance of the former can be determined uniformly by determining the inner diameter of the pressurized sleeve 35 and the amount of advance of the pressurized bridge 36.
• the required force is also that the shearing of the solidified layer always occurs only at the inner peripheral tip 35d of the pressurized sleeve 35, and the shearing surface r (shown in Fig. 5) When the thickness is almost constant Therefore, it is required uniformly.
• the time required for solidification of the molten metal in the mold space 30 varies depending on the volume and space height of the mold space 30, etc., so the pressure plunger must be
• the time required for coagulation is measured by changing the time for retreating 6 to the seed force, and the time required for coagulation is determined by adding a predetermined additional time (1, 2 seconds) to this time. ),
• the hydraulic switching valve 42 should be switched by the timer after a lapse of time.
• the signal oil pressure is still applied to the first signal.
• the molten metal solidified in the ejection sleeve 14 can be pushed out from the ejection sleeve 14 by flowing to the side of the ejection sleeve 14.
• the dycast product manufactured by this die casting method has the shape shown in Fig. 6 and Fig. 7.
• the part solidified in the injection sleeve 14, the injection passage 31, and the air vent 33 (shown by hatching R in Figs. 6 and 7) )
• the part of the mold space 30 that is solidified in the hot water reservoir]? 32 (the part indicated by hatching S in Figs. 6 and 7) is cut with a lathe to complete the product.
• the part solidified in the tub 9 part 32 is cut for the following reason. -Immediately, in the water reservoir 9 3 ⁇ 4 32, the water is pushed up by the pressurized plunger 36, and the solidification proceeds under this condition.
• the solidified layer 9 formed in the city 32 is sheared before it grows sufficiently and surface defects occur. In particular, this surface defect is undesirable because it degrades the mechanical strength of the die cast product.
• the time for crystallizing the molten metal varies depending on the type of metal, only the first crystallized metal remains, and the metal that is still in the molten state is pressurized. It will be extruded under the pressure of the ranger 36, so that segregation is likely to occur.], This segregation is the workability of Dycast products. (Machinability) is adversely affected and precision machining becomes difficult.
• Fig. 8 and Fig. 9 are reference photos showing the structure of the dycast product with surface defects and the structure of the dycast product with segregation, respectively. This is what was seen in the reservoir D section 32.
• the cast an is used as a side rod and a peg of a rotating machine.
• the hole after cutting the reservoir 32 is passed through the rotating shaft. Use it to make it work.
• FIG. 10 is a reference copy showing the structure of the solidified product part in the mold space 30 other than the basin 32 of the die-cast product manufactured by the method of the present invention.
• the pressurized bridge 36 used to carry out the method of the present invention must be disposed in the movable mold 26.
• it may be used on the fixed type 18 side, or the sliding surface of the movable type '26 and the fixed type may be slid.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Molds, Cores, And Manufacturing Methods Thereof (AREA)
• Moulds For Moulding Plastics Or The Like (AREA)
• Injection Moulding Of Plastics Or The Like (AREA)

Priority Applications (8)

Applications Claiming Priority (2)

Publications (1)

Family

ID=13677611

Family Applications (1)

Country Status (4)

Cited By (4)

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Citations (3)

Family Cites Families (4)

• 1979
  • 1979-02-14 JP JP79500474A patent/JPS5930503B1/ja active Pending
  • 1979-02-14 GB GB8022133A patent/GB2055315B/en not_active Expired
  • 1979-02-14 WO PCT/JP1979/000034 patent/WO1980001657A1/ja unknown
  • 1979-02-14 DE DE19792953436 patent/DE2953436C2/de not_active Expired

Patent Citations (3)

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