Classifications

• • 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
  • B22D17/2015—Means for forcing the molten metal into the die
  • B22D17/2053—Means for forcing the molten metal into the die using two or more cooperating injection pistons
• • 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
  • B22D17/2015—Means for forcing the molten metal into the die
  • B22D17/2069—Exerting after-pressure on the moulding material
• • 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

Definitions

• the present invention relates to a die casting method and an apparatus. More specifically, the present invention relates to a method of injecting molten metal into a mold and pressurizing the molten metal from a point outside the injection point. The present invention relates to such a die force method and apparatus. ⁇
• the pressure plunger and the pressure passage are tightly fitted, the pressure Since the pressurizing pressure of the jerk is as high as 100 atm or more, the inner diameter of the pressurizing passage is slightly elastically deformed and expanded, thereby increasing the pressure inside the pressurizing passage. A slight gap is formed between the wall surface and the outer periphery of the tip of the pressurized bridge, and the molten metal enters into this slight gap. This causes a problem that the pressurized plunger cannot be smoothly slid because of this. If the sliding of the pressurized plunger occurs, the frictional resistance during the sliding of the pressurized plunger sharply increases, and is added to the unsolidified molten metal in the mold space.
• An object of the present invention is to provide a die casting method and apparatus capable of reliably maintaining the effect of a hot water on a solidified molten metal for a long time even in mass production and reliably preventing the occurrence of nests. It is a thing.
• the present invention provides "a plurality of molds are brought into close contact with each other]), a mold space for manufacturing a product, and a molten metal introduced into the mold space with one end opened in the mold space.
• the injection passage is formed into the mold space and the pressurized passage at a predetermined pressure.
• the molten metal is filled in the mold space and the pressurized passage, and then the pressurized plunger in the pressurized passage is advanced.
• the pressurized flanger in the minute gap between the outer peripheral surface of the pressurizing plunger and the inner peripheral surface of the pressurizing passage, the pressurized flanger is sandwiched between the molten metal and the solidified layer of the molten metal. To prevent the molten metal from sticking to the outer peripheral surface of the pressure plunger.
• FIG. 1 is a sectional view showing an embodiment of an apparatus used to carry out the method of the present invention
• FIGS. 2 and 3 are pressurized plungers 3 shown in FIG. 6, a cross-sectional view showing the basin section 32
• FIG. 2 shows a state in which the pressurized blower 36 is retracted most
• FIG. 3 shows a depressurized pressurized blower. 36 shows the most advanced state.
• FIG. 4 is an explanatory diagram for explaining the relationship between the time lag and the amount of hot water
• Figs. 5 (a) and 5 (b) are Reference photos showing the structure of the die cast product where defects and segregation have occurred.
• Fig. 6 is an explanatory diagram for explaining the relationship between the amount of hot water and product density.
• Fig. 8 is a partial cross-sectional view used to explain the generated solidified layer
• Fig. 8 is an explanatory diagram used to explain the relationship between the elapsed time after filling and the thickness of the solidified layer
• Figs. 9 (a) and 9) are Fig. 1 Sectional and plan views showing the shape of the die-cast product to be manufactured.
• Fig. 10 shows the structure of the manufactured product part.
• Fig. 11 shows the present invention.
• FIG. 9 is an explanatory diagram showing the difference in product density between the product obtained by the method and the die casting method using a high pressure.
• Figs. 12 and 13 show another embodiment of the
• OMPL- Fig. 12 is a cross-sectional view of the tip of the plunger.
• Fig. 12 shows the retraction state of the pressure plunger 36
• Fig. 13 shows the retraction state of the pressure plunger 36. Shows the most forward state.
• reference numeral 1 denotes a fixing stand of the apparatus, which is fixed to a floor of a factory or the like via an embedded bolt (not shown).
• Reference numerals 2 and 3 denote injection cylinder holders fixed to the fixed base 1, which hold the injection cylinder 4 fixedly.
• An injection piston 5 is slidably held on the cylindrical inner surface 4'a of the injection cylinder 4], and the first and second openings at both ends of the injection cylinder 4 In response to the hydraulic pressure of signal hydraulic pipes 6, 7-] ?, injection piston 5 can be displaced in injection cylinder 4 in the horizontal direction in the figure.
• the signal pressure is a hydraulic pump shown in the figure. Introduced via the input pipe 8 and sent to one of the first and second signal hydraulic pipes 6 and 7 by the hydraulic switching lever 7 made of a solenoid valve. ), The oil in the injection cylinder 4 pushed out by the injection piston 5 is removed from the signal hydraulic pipe on the side to which the signal pressure is not supplied. 6 or 7 'and via oil / pressure switching valve 9: output. Type 10)]) It is sent to the hydraulic pump side shown)). Also, 11 is the pressure signal installed in the middle of the first signal hydraulic pipe 6.
• a predetermined pressure for example, a pressure that is about 50 to 80% larger than the maximum value of the injection pressure described later
• Reference numeral 15 denotes a hot water supply port for the molten metal, which is located on the upper side of the injection sleeve 14 when the injection plunger 13 is retracted most (the state shown in FIG. 1).
• a molten metal such as an aluminum alloy, a magnesium alloy, or a zinc alloy is supplied from a molten metal injector (not shown) into the emission sleeve 14 from the hot water supply port 15. It is rising.
• FIG. 1 shows only the left end of the clamping rod 22. However, actually, it is also provided at the right end of the tightening rods 22, 22.
• the fixed mold 18 obtains a precise mold shape for reasons such as enhancing the maintainability, etc.)), and a fixed block 19 made of die-titanium (FCD55) It is divided into a fixed core 20 made of an intermediate tool steel (SKD61) and is fixed to the fixed block 19 and the fixed core 2 by a hexagon socket head bolt 21. Are connected.
• the injection sleeve 14 described above penetrates through the fixed support 16 and the fixed block 19, and is fixed to the fixed block 1'9.
• W1PO It is open to the end face.
• a movable mold 26 is fixed to the movable mold support 23 through a side clamp plate 24 and upper and lower clamp plates 25, 25.
• the movable mold 26 is also fixed as described above.
• KD-61 is formed by connecting a movable core 28 made of 1) with a bonolet 29.
• the movable support 23 is displaced to bring the movable mold 26 into close contact with the fixed mold 18 by displacing the movable support 23.
• an injection passage 3 1 for emitting molten metal into the mold space 3 0 communicates with the mold space 30 in a different position from the injection channel 3 1 of this pressure
• a pressure passage 17 is formed]
• 0.1 to 0.1 is set at a predetermined portion of the joint surface between the fixed die 18 and the movable die 26.
• the air in the mold space 30 0- pushed out by the injected molten metal escapes the air vent 3 3- is formed.
• a gate 34 is formed at the end of the injection passage 31 on the side of the mold space 30 to reduce the diameter of the passage.
• the supplied molten metal is injected into the mold space 30 at a high speed.
• Reference numeral 35 denotes a pressure sleeve which is opposed to substantially the center of the mold space 30 and is press-fitted and fixed to the movable core 28, and is made of hot tool steel (SKD61) in a cylindrical shape.
• a pressure plunger 36 made of hot tool steel (SKD61) is tightly and slidably inserted into the pressure sleeve 35.
• a pressurizing passage 17 is formed in the space in the forward direction from the end of the pressurizing plunger 36 on the inner surface of the pressurizing sleeve 35. Then, the molten metal filled in the pressurizing passage 17 by the pressurizing plunger 36 is applied to the opposing portion of the pressurizing passage 17 in the mold space 30. 2) is pushed out to the side.
• the pressurized plunger 36 should be replaced only for the part that slides inside the pressurized sleeve 35 for maintenance. Composed of both members
• Figs. 2 and 3 show the pressure sleeve 35 and the tip of the pressure plunger 36. Figs. 9 and 32].
• the inner peripheral surface of the pressurized sleeve 35 is located at the front end side. Is larger than the other parts (for example, about 0.1 dragon).
• the diameter D of the large diameter part 35a is slightly larger than that of the other parts. With respect to the diameter of the pressure projector 36, it is better to determine the range of d_ + 0.05 basket ⁇ D ⁇ + ((iX0.05) ⁇ ).
• the length a of the large-diameter portion 35a is determined based on the amount of hot water supplied by the pressurizing plunger.] 6 is the most retracted position 35 G (the state shown in Fig. 2)] is also a predetermined amount X (10 ⁇ or less, preferably 2-3 dragons) Forward point 3 5 (1 ]) It is desirable that the length be up to the tip 35 e of the pressurized sleeve 35, that is, 35 mm at the end of the mold space 30 side. However, in practice, the length of the large diameter portion is extended to the point 35 (1 is the last retreat position 35 C of the pressure plunger 36) 9 until it is positioned slightly backward.
• the displacement amount of the pressure plunger 36 may be at the most advanced position 35f (the state shown in Fig. 3).
• the amount of displacement is the pressure. It is desirable to make sure that the flange 36 does not penetrate directly into the reservoir 32 of the mold space 30. If the tip of the jaw 36 penetrates a little into the tub J9 32, it is not practically problematic.
• the basin j9 part 32 is a mold space 30
• the part facing the pressurizing passage 17 is j.
• the size is the cross-sectional area of the pressurizing plunger 36 in the direction perpendicular to the traveling direction is the cross-sectional area of the pressurizing passage 17. ) Set to be bigger j? And this water pool]? Part 3 2 is usually cut after die casting! ) Removed. '
• Reference numeral 38 denotes a pressure piston provided on the rear end side of the pressure plunger 36.
• the pressure plunger slides inside the pressure cylinder 39 to press the pressure plunger. It transfers the forward and backward displacement to the controller 36.
• the third and fourth signal hydraulic pipes 40 and 41 are open on the pressurized cylinder 39, and the hydraulic switching valve made of a solenoid valve is opened.
• the hydraulic pump (not shown) is controlled.]?
• the input signal oil pressure is controlled to move the pressurized piston 38 forward and backward. .
• the pressurized cylinder 39 is fixed to the side clamping plate 25 by the bonole 4-3, and moves together with the movable mold '26. It is.
• the reference numeral 44 penetrates the movable block 27 and the movable core 28, and the tip of the projection faces the surface of the movable core 28 in the j-type space 30.
• Jig tough Extrude via push-in rod 48, rate 45, push-out rod 46, push-out plate 47, and push-out rod 48. In response to the displacement of 49, it is displaced in the horizontal direction in the figure.
• the push-out port 46 is provided on the movable block 27. By sliding in the sliding hole (not shown), it is possible to move left and right in the figure.
• 50 is an extruder cylinder that displaces the push piston 49, and is an injection cylinder.
• the fifth and sixth signal hydraulic pipes 51 and 52 are open.]
• Hydraulic pumps (not shown)]?
• the input signal hydraulic pressure is controlled by a hydraulic switching valve 53 made of a solenoid valve, and the push-out piston 50 is moved forward and backward. '
• the molten metal is poured into the injection port 15 and into the injection sleeve 14 and a part of the injection passage 31, and then the hydraulic pressure is switched.
• the signal hydraulic pressure is supplied to the first signal hydraulic pressure passage 6 side by the bubble 9, and the injection piston 5 (in other words, the injection plunger 13) can be determined by the signal hydraulic pressure. Advance at a given pressure. Then, as the injection plunger 13 advances, the hot water poured into the injection sleeve 14 is pushed out to the injection passage .. 31 side.
• the molten metal is injected into the mold space 30 and the pressurized passage 17 by accelerating while passing through the gate 34 and melts in the mold space 30 and the pressurized passage 17.
• the pressure (injection pressure) applied to the molten metal at this point is about 500 to 150 atm.
• the air existing in the mold space 30 and the pressurized passage 17 is caught in the molten metal at the time of the injection and causes a dot nest.
• the air vent 33 provided at a predetermined part of the contact area with the air allows a part of the air existing in the mold space 30 and the pressurized passage 17 to escape. I am trying to do it.
• the time lag the time until the start of the hot water (hereinafter referred to as the time lag) is long. If the time is too long [9], the molten metal filled in the mold space 30 will Coagulation occurs, and the coagulation layer generated during this time is under pressure and cannot prevent the formation of nests. The strength and airtightness may be inferior), and once the nest has formed, the solidified layer must be crushed in order to remove it.
• the pressurizing pressure must be set to a large value. In other words, if the pressurizing pressure is the same, increasing the time lag will result in insufficient hot water. This has been confirmed by the results of an experiment conducted by the inventor on the relationship between the time lag and the amount of hot water (illustrated in Fig. 4). 3 ⁇ 4
• the solid line L indicates the experimental result when the pressure was applied at a pressure of 275 OKZ c ⁇ ]
• the dashed line M and the broken line N indicate 2 12 ⁇ H, respectively.
• the experimental results at a pressure of / ci ⁇ 1500 ⁇ are shown.
• Figs. 5 (a) and 5 (b) are reference photographs showing the structure of a product with surface defects and the structure of a product with segregation, respectively, when the time lag is too long. It was found in the die cast products made by the die force
• the movement start of the pressurized plunger 36 is controlled as follows. That is, when the filling of the mold space 30 and the pressurized passage 17 with the molten metal is completed, the advance of the injection bridger 13 stops.
• the pressure rise is detected by the pressure switch 11, and when the pressure in the passage 6 rises above a predetermined pressure, an electric signal is applied to the pressure switch 11 by the pressure switch 11. Then, when this electric signal is applied, the oil pressure switching panel 42 supplies the signal oil pressure to the third signal oil pressure passage 40. Then, immediately after the injection is completed (usually about 0.5 seconds), the pressurized plunger 36 can be advanced.
• the die casting apparatus normally takes 56 seconds to complete the solidification of the molten metal in the gate 34, so that the timing of the present embodiment This is sufficiently shorter than the time required to complete the solidification of the molten metal in the gate of 34 parts.
• the molten metal in the pressurizing passageway '17 is pushed out into the reservoir 32 by the rapid advance of the pressurizing plunger 36. ])
• the molten metal filled in the reservoir 32 of the mold space 30 is to be pressed (pressurized). Since the gate 34 is not yet solidified at the time of this pressurization, the molten metal in the pressurizing passage 17 is pressed not only by the mold space 30 but also by the injection passage 3.
• the flow also flows back to the outlet 1 and the outlet sleeve 14, and the molten metal in these passages 31 ⁇ is also pressurized.
• the amount of hot water required for this pressurization was simply the amount required for pressurizing only the amount corresponding to the solidification shrinkage of the molten metal poured into the mold space 30_ and the pressurized ffi path17.
• the inventor of the present invention varied the amount of the hot water in various ways to obtain a density as shown in FIG. 6 when the density of the product produced based on the amount of each hot water was adjusted.
• the points indicated by ⁇ indicate the density of the product manufactured by the die casting method without applying pressure
• the points indicated by ⁇ indicate the density according to the method of the present invention.
• the 0 indicates the true density of the metal used in the die (in this example, an anodized aluminum alloy for die casting). Is the maximum amount of hot water that can be obtained from the area of the pressurized surface of the pressurized plunger 36 and the sliding distance of the apparatus used in this experiment.
• the product-density is improved in accordance with the increase in the amount of hot water until the amount of the hot water reaches the predetermined amount of 1 (the lower part is referred to as a first area 0). From the specified amount of 1 to the maximum amount of hot water. Up to this point, the product density is true density. Keep the value approximating to?], (This part is hereinafter referred to as the second area P.) The maximum amount of hot water. In terms of density, the product density is about the same as the density of the product under pressure, but the true density
• the present inventor examined the predetermined amount ⁇ that is the minimum amount for entering the second region.
• va is the amount of molten metal filled in the mold space 30 and the pressurized passage.
• the predetermined amount 1 is the pressure applied from the pressure plunger 36 side to the injection plunger.
• the actual amount V of the practical hot water to be used must be larger than the predetermined amount 1). Also, a predetermined amount in the second area! ])
• the reason why the product density is constant even when the amount of the hot water is increased is that the amount of the molten metal in the injection passage 31 and the injection sleeve 14 is constant. This is considered to be because it is used to compensate for the shrinkage. Therefore, if the pressing force of the pressurizing plunger 36 is set to the pressure at which the injection purgers 1 and 3 are not pushed back, the displacement of the pressing plunger 36 The amount of hot water supplied by the mold is used to compensate for the solidification shrinkage of the molten metal filled in the mold space 3 (X injection passage 31 and injection sleeve 14). Therefore, in theory,
• V fills the injection passage 31 and injection sleeve 4.
• the amount of molten metal hereafter the amount of molten metal on the injection passage side and o
• the required amount is required.
• the spigot 34 on the injection passage 31 and the injection sleeve 14 is so narrow that the molten metal on the injection passage side does not solidify sufficiently.
• the solidification of the molten metal in the gate of 34 parts will be completed.
• the gate 34 is solidified, the molten metal in the injection passage will not be pressurized any more.
• the term -V3 ⁇ 4 in the above equation is a practical requirement.]?
• the inventor of the present invention obtained the amount of the hot water under various conditions by experiments and estimated the solidification rate of the molten metal in the injection passage 31 and the injection sleeve 14 when the gate 34 was solidified.
• the solidification of the gate 34 when the solidification of the gate 34 is completed, only about 30 to 50% of the molten metal in the injection passage 31 and the injection sleeve 14 may be solidified. was recognized. Therefore, in practice
• V V a ⁇ V 3 ⁇ 4 X (0.3 to 0.5) 3
• the amount of hot water determined by P 0 P 0 is the minimum amount as the actual amount of practical hot water V to be used.
• the maximum hot water coefficient was set to about 1 with the amount obtained in the above and 33 o is as follows. That is, the maximum hot water volume of the device. If the pressure is too large, it is necessary to apply an excessive load to the pressurized piston 38)) Since the size of the runner 36 and the reservoir 32 must be large, it is difficult to design the equipment, and the material yield]? The ratio of the molten metal that actually solidifies in the mold space 30 out of the total molten metal injected from the Langer 13) is also desirable. Therefore, the actual amount V of hot water used for carrying out the method of the present invention is "a large amount" than the amount obtained by the formula (3), and
• L is the length of the pressurized bridge 36 at the contact surface between the solidified layer formed in the pressurized passage 17 and the inner wall of the pressurized sleeve 35.
• e (ti :) is the thickness of the solidified layer after ti seconds have elapsed after filling the pressurized passage 17.
• the value is 2 to 31 ⁇ ⁇ ) -6).
• the shear plane ⁇ is generated in a direction of 45 ° with respect to the thickness direction of the solidified layer ⁇ , so that the shear plane r
• the thickness was set to ⁇ ⁇ ⁇ e (ti).
• the maximum pressure Pmax is the maximum pressure in the range where the injection plunger 13 is pushed back.
• the pressure applied to the flange 13 is the pressure flange 36.])
• the pressures Pa and D, and the molten metal passes through the gate 34 etc.
• OMP1, ⁇ , W1PO This is a pressure obtained by subtracting the pressure drop ⁇ ⁇ generated at the time of injection. I just need.
• U i Is the maximum pressure of the pressurized bridge 36.
• the maximum pressure P max P obtained by the above equation is used, depending on the product, the pressure drop ⁇ ⁇ and the solidification layer It is often considered that the applied pressure becomes excessive due to variations in the thickness ⁇ , etc., so that the maximum pressure P max 'actually used is smaller than the maximum pressure P ma obtained by the above equation. There is a need to.
• the maximum pressure P max 'actually used is the maximum pressure P ma, let the pressure drop ⁇ ⁇ term (r + 2Lt) AP be
• the time t 2 after the filling of the molten metal is determined by the pressurized planner.
• the time required to move to half of the sliding distance L should be used.
• the pressurizing passage 17 is pressurized with a pressure of a predetermined magnitude between 5 max and at least this pressurization causes the molten metal in the mold space 30 and the pressurizing passage .17 to be pressurized. Until the solidification is completed, in other words, the gate 3 4] Continue until the mold space 30 is completely solidified o
• the most characteristic feature of the present invention is that the sliding action of the pressure plunger 36 in the fourth step is performed for a long time.
• the pressing force of the pressurizing plunger 36 can be maintained within the above-mentioned predetermined range.] Therefore, in the present invention, a large-diameter portion 35a as shown in FIGS. 2 and 3 is provided in the mold space 30 side portion of the pressurizing passage 17 so that the pressurizing plunger 36 moves forward. At this time, the ring-shaped solidified layer is formed in a minute gap 35 ⁇ formed between the outer peripheral surface on the tip end side of the pressurized plunger 36 and the inner surface of the pressurized passage 17. Pressing bridge 36 moves forward while pinching thin film A]? In addition, the solidified layer can be prevented from entering the tight fitting portion between the pressure bridge 36 and the pressure sleeve 35.
• the solidified layer of the molten metal is pushed into the large-diameter portion 35a together with the pressurized plunger 36, so that there is no time allowance for the large diameter portion 35a.
• a ring-shaped thin film A is formed on the outer peripheral side of the tip of the pressure clamp 36, and this thin film A is pressurized. Due to the pressing action of the jaw 36], the molten metal flows into a solidified solidified layer with a forged structure.
• OMPI It plays a good role as a skin material to prevent protrusion, and while being sandwiched between the pressure plunger 36 and the inner surface of the large diameter portion 35a, the pressure plunger Move forward to the position shown in Fig. 3 with jumper 36. c. Prevents the solidified layer from penetrating into the tight fit between the flange 36 and the pressure sleeve 35 to prevent poor sliding of the pressure flange 36. You can.
• the pressurized plunger 36 passes through the fitting portion of the predetermined amount X. This takes a long time, and the solidified layer invades at the fitting portion of the fixed amount X, which is preferable. Also, the fitting portion of the predetermined amount X is eliminated, and the ⁇ retreat position of the pressurized plunger 36.
• the 35 G is set to the large diameter portion 35 a side, Since the distal end of the spring 36 enters the large diameter portion 35a from the beginning, the length of the large diameter portion of the pressure plunger 36 is increased. If too hard, the solidification layer thin film A force is cut. Therefore, one end 35 of the large diameter portion 35a (1 needs to be set near the retreat position 35 c of the pressure plunger 36)
• the hydraulic switching valve 42 is turned off by a ball screw [3]. Okuichi. Since the thin film A has a forged structure and is strong, and has a certain thickness, it is not cut when the pressure plunger 36 is retracted.
• the signal hydraulic pressure is switched off by the hydraulic pressure switching valve 9 and the second signal is supplied to the pipe 7 side, whereby the injection plunger 13 is retracted.
• the hydraulic pressure switching valve 53 By actuating the hydraulic pressure switching valve 53, the signal hydraulic pressure is moved to the fifth signal hydraulic pipe 51 side.
• the die casting method of the present invention is completed by the above steps.
• the die cast manufactured by the die casting method has a shape as shown in FIG. Therefore, after die casting, the solidified part in the injection sleeve 14, the injection passage 31, and the air vent 33 (Fig. 9 Cut the cross-hatched area R) by pressing to remove j9, and furthermore, cut off the water reservoir section? 2 (Fig. 9: cross-hatched area S) to complete the product.
• part or all of part 3 2 it is desirable to cut it for the following reasons.
• FIG. 10 is a reference photograph showing the structure of the product portion solidified in the mold space 30 of the die cast product produced by the method of the present invention. It can be seen that in the product made by the method described above, no flaws, surface defects, segregation, etc. occurred.
• Fig. 11 shows the density distribution of the product made by the method _ of the present invention (indicated by the symbol ⁇ in the figure) in the case of using both an anodized aluminum alloy as a die casting material.
• FIG. 11 This is a diagram comparing the density distribution of products made with conventional die-casting without pressurization (indicated by the squares in the figure)]), and 13 6 die-cast products.
• the figure shows the density of each piece when cut into small pieces.) This shows how many small pieces were obtained at each density.
• FIG. 11 the density of the product obtained by the method of the present invention is improved to a value close to the true density. It can be seen that nests, which have the most adverse effect on airtightness, are almost completely blocked.
• FIG. 12 and FIG. 13 show another embodiment of the present invention.
• a small diameter part 36 (1) having a predetermined length Z is provided at the tip of the pressure plunger 36, and the small diameter part 36 (1 and the pressure sleeve 3 A small gap 35 mm is formed between the inner and outer surfaces 5 to prevent the solidified layer from galling on the outer peripheral surface of the pressurized bridge! 6 (The diameter D 'of 1 is equal to the diameter ⁇ ⁇ of the pressure plunger 36.
• the small diameter portion 36 is not linear, and may be formed in a slight tapered shape.
• distal end surface 36C of the pressure plunger 36 is not limited to a flat surface, and can be changed to various forms such as a convex surface and a concave surface.
• pressurized bridge 36 used for carrying out the method of the present invention does not have to be arranged in the movable mold 26]? It may be used on the fixed mold 18 side, or may slide on the joint surface between the movable mold 26 and the fixed mold 18.
• O PI It can be used as a manufacturing method for

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Injection Moulding Of Plastics Or The Like (AREA)
• Moulds For Moulding Plastics Or The Like (AREA)

Priority Applications (8)

Applications Claiming Priority (2)

Publications (1)

Family

ID=13677610

Family Applications (1)

Country Status (4)

Cited By (7)

Families Citing this family (7)

Citations (2)

Family Cites Families (2)

• 1979
  • 1979-02-14 JP JP79500468A patent/JPS602947B1/ja active Granted
  • 1979-02-14 GB GB8020757A patent/GB2056338B/en not_active Expired
  • 1979-02-14 WO PCT/JP1979/000033 patent/WO1980001656A1/ja unknown
  • 1979-02-14 DE DE2953435T patent/DE2953435C2/de not_active Expired

Patent Citations (2)

Also Published As

Similar Documents

Legal Events