GB2123326A - Cold chamber die casting machine - Google Patents
Cold chamber die casting machine Download PDFInfo
- Publication number
- GB2123326A GB2123326A GB08316797A GB8316797A GB2123326A GB 2123326 A GB2123326 A GB 2123326A GB 08316797 A GB08316797 A GB 08316797A GB 8316797 A GB8316797 A GB 8316797A GB 2123326 A GB2123326 A GB 2123326A
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- GB
- United Kingdom
- Prior art keywords
- molten metal
- casting machine
- passage
- die casting
- cold chamber
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Classifications
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- 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
-
- 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
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
A molten metal passage (23) leading the molten metal (37) supplied through a molten metal inlet up to a forming cavity (50) of a mould by an injection piston (23a) rises gradually in the direction of the mould. Accordingly, the air in the molten metal passage is injected into the forming cavity prior to the molten metal whereby the amount of blowhole and/ or sink occurring in a product cast in the forming cavity is reduced. In an embodiment (Figure 18, not shown) a movable dam member (85) may initially restrain molten metal from moving up the passage towards the mould. In an embodiment of die-casting machine described, there may be multiple mould cavities disposed radially about a common inlet runner; the axes of the cavities may be horizontal (Figure 12) or inclined at the same angle to the horizontal as is the molten metal passage (Figure 16). The machine may include a melting furnace, means for supplying metal spheres to be melted to the furnace, a slag skimmer, a trimming device for trimming the casting(s) and means for returning trimmings to the melting furnace. <IMAGE>
Description
SPECIFICATION
Cold chamber die casting machine
The present invention relates to a cold chamber die casting machine, capable of enhancing the quality of its product.
As shown in Figure 1, a cold chamber die casting machine according to a prior art generally comprises a base stand 1, fixed frame 2 mounted on the base stand la a fixed mould 3 fixed to the fixed frame 2, a movable frame 4 moved forward and backward regarding the fixed frame 2, a movable mould 5 fixed to the movable frame 4 and capable of contacting with the fixed mould 3 and a movable frame driving device 6 and it is constructed in such a manner that, after both the fixed mould 3 and the movable mould 5 are caused to abut closely against each other, a molten metal 10 is supplied through a molten metal inlet 9 to an injection mould cylinder 7 provided in the fixed frame 2 by a ladle 8, as shown in Figure 2(a) and a moulding cavity 16 formed by the fixed mould 3 and the movable mould 5 is filled with the molten metal 10 (refer to Figure 2(d)) through a cylindrical molten metal passage 12 formed in the cylinder 7, a transfer hole 13, a runner 14 and a gate 15 by a low velocity drive of a piston 11 (refer to Figure 2(b)) and a high velocity drive thereof (refer to Figure 2(c)) so that the molten metal 10 is casted.
In the above die casting machine, however, since the bottom face 12a of the cylindrical molten metal passage 12 in the cylinder 7 is formed horizontally, the molten metal 10 supplied to the cylindrical molten metal passage 12 is collected in the substantially lower half of the cylindrical molten metal passage 12 while air remains in the upper half thereof, whereby the molten metal loins forced into the moulding cavity 16 under the condition that the air remains in the cylinder 7 yet at the time of the low velocity drive, as shown in Figure 2(b), and the molten metal 10 mixed with the air remaining in the cylinder 7 is forced into the moulding cavity 16 at the time of the high velocity drive, as shown in Figure 2(c) in accordance with the drive of the piston 11.
Accordingly, the cold chamber die casting machine has a high possibility that blowholes and the like are formed in products 17 and 18 shown in Figures 3 and 4 whereby the quality of the products 17 and 18 are lowered.
In addition thereto, if the molten metal 10 remtaining in the transfer hole 13, the runner 14 and the gate 15 is reduced in order to avoid the waste of material, the remaining molten metal 10 is solidified more quickly than the molten metal 10 in the moulding cavity 16 and at the time of the solidification the air mixed in the molten metal 10 remaining in the transfer hole 13 is moved into the molten metal 10 in the moulding cavity 16 so that the products 17, 18 become apt to be formed with the blowholes therein, sinks thereon and the like. For this reason, the molten metal 10 remaining in the transfer hole 13 and the like is increased to a certain extent so that the molten metal 10 in the moulding cavity 16 must be solidified more quickly than the molten metal 10 remaining in the transfer hole 13 and the like.As a result, the residue of the molten metal 10 in the transfer hole 13, the runner 14 and the gate 15 is increasted whereby the yield of the product is reduced.
Furthermore, in the die casting machine the bottom face 12a of the cylindrical molten metal passage 12 is formed horizontally, as set forth above, and, therefore, if the moulding cavity 16 is formed below the transfer hole 13 provided at the end of the cylindrical molten metal passage 12, the molten metal 10 supplied to the cylindrical molten metal passage 12 begins to flow in the moulding cavity 16 through the transfer hole 13, the runner 14 and the gate 15 to solidify at the same time as the supply of the molten metal 10 before the molten metal 10 is forced into the moulding cavity 16 by the drive of the piston 11 so that the solidification unevenness occurs in the product.Accordingly, the moulding cavity 16 must be provided above the transfer hole 13 necessarily, as shown in Figures 3 and 4, which results in that, for example, a product formed in a radial shape, centering the transfer hole 13 (refer to Figures 9(a) and 9(b)), can not be casted.
In view of the above facts, the present invention has as its object the provision of a cold chamber die casting machine, capable of preventing the blowholes or the sinks from occurring in a product and of enhancing the effective use of material.
The cold chamber die casting machine according to the present invention is such constructed that the bottom face of the cylindrical molten metal passage, in which the molten metal supplied through a molten metal inlet to an injection mould cylinder is pushed out into a transfer hole by an injection piston, is formed in a sloope rising gradually in the pushing-out direction of the injection piston so that the air of the cylindrical molten metal passage is first forced into a moulding cavity and thereafter the molten metal is forced thereinto. Accordingly, the number of the sinks and/or the blowholes occurring in a product is decreased whereby the quality of the product can be improved, and the amount of the molten metal remaining in a transfer hole and a gate is reduced to thereby promote the effective use of material. Thus, the yield ofthe products is improved.
An embodiment of the invention will now be described by way of example and with reference to the accompanying drawings in which:
Figure lisa sectional side view showing a part of a die casting machine according to the prior art;
Figure 2(a) through 2(d) are explanation views showing the steps from the supply of a molten metal to the pushing-in of the molten metal into a moulding cavity in the above die casting machine;
Figure 3(a) is a front view of the product casted by the above die casting machine;
Figure 3{b) is a side view of the product shown in
Figure 3(a);
Figure 4 is a front view of another product casted by another die casting machine according to a prior art;;
Figure 5 is a sectional side view of a die casting machine provided with a dam plate, which has been proposed by the present inventors;
Figures 6(a) through 6(d) are explanation views showing the steps from the supply of a molten metal to the pushing-in of the molten metal into a moulding cavity, respectively, in the die casting machine shown in Figure 5;
Figure 7 is a sectional view of a cylindrical molten metal passage shown in Figure 6;
Figure 8 is a perspective view of the dam plate shown in Figure 5;
Figure 9 is a brief plan view of a casting equipment provided with a cold chamber die casting machine showing one embodiment of the present invention;
Figures 10 and 11 are a plan view of a melting furnace shown in Figure 9 and a vertical sectional view thereof;;
Figure 12 is a partially sectional side view showing the cold chamber die casting machine shown in
Figure 9;
Figure 13/at is a front view of a product casted by the cold chamber die casting machine shown in
Figure 12;
Figure 13fbJ is a vertical sectional side view of the product shown in Figure 12;
Figure 14(a) is a plan view of a dross remover shown in Figure 9;
Figure 14(b) is a sectional view of the dross remover taken along the line XIV-XIV;
Figure 16(a) through 15(do are explanation views showing the steps from the supply of a molten metal to the pushing-in of the molten metal into a moulding cavity in the cold chamber casting machine shown in Figure 9;;
Figure 16 is a partially sectional side view showing another embodiment of the cold chamber die casting machine according to the present invention;
Figures 17(a) through 17/do are explanation views showing the steps from the supply of a molten metal to the pushing-in of the molten metal into a moulding cavity in the cold chamber die casting machine as shown in Figure 17;
Figure 18 is a vertical sectional view of a main portion of the cold chamber die casting machine shown in Figure 12 and provided with a dam plate;
Figure 19 is a sectional view of an enlarged main portion of the dam plate shown in Figure 18;
Figures 20A)a and 20(b) are perspective views of dam plates, respectively;
Figure 21(a) is a front view showing another embodiment of the product shown in Figure 13;; Figure 21/61 is a vertical sectional side view of the product shown in Figure 21(a);
Figure 22 is a vertical sectional view showing another embodiment of the melting furnace shown in Figure 11;
Figure 23 is a front view showing another embodiment of a molten metal supplier in which a lid is closed;
Figure 24(a) is a front view showing the molten metal supplier shown in Figure 23 in which the lid is open; and
Figure 24(b) is a side view of the molten metal supplied shown in Figure 23:
Before the embodiments according to the present invention are described, a cold chamber die casting machine which has been developed by the present inventors in order to obviate the above-described problems are described below.
The cold chamber die casting machine is shown in
Figures 5 through 8. In the die casting machine; a dam plate 7a is mounted on an appropriate portion of the cylindrical molten metal passage 12 formed in the fixed frame 2, the injection mould cylinder 7 and the like elevationably from the bottom face 1 2a of the cylindrical molten metal passage 12. As shown in
Figure 6(a), the dam plate 7A is rised at the time of supply of the molten metal 10 through the molten metal inlet or at the beginning of the injection thereof so as to restrict the movement of the molten metal 10.Thus, it has been taken into consideration, in the die casting machine, that the molten metal.10 does not flow into the moulding cavity 16 through the transfer hole 13 before the molten metal 10 is forced into the moulding cavity 16 by the drive of the piston 11, whereby the casting of metal is carried out with mixture of less air to thereby obviate the above problems, as shown in Figures 6(b) to 6(d).
In the die casting machine the dam plate 7A has a plane shape of a rectangle, an ellipse orthe like, as shown in Figure 8. In addition, the dam plate 7A is moved downwardly at the time of movement of the piston 11 and the upper end 7B of the dam plate 7A is formed in the same curved surface as the inner circumferential surface of the injection mould cylinder 7 so as not to prevent the piston 11 from moving at the time of the movement thereof, as shown in
Figures 7 and 8.
The present invention is described in detail below on the basis of embodiments shown in Figures 9 through 24(b).
Figure 9 shows a casting equipment provided with a cold chamber die casting machine of one embodiment according to the present invention, which comprises a material supplier 21, a melting furnace 22, a molten metal supplier 32, an injection mould cylinder 23, a fixed frame 24, a movable frame 25, a movable frame driving device 26, a product holding device 27, a product finishing device 28, a product packing device 29, a recovering device 30 and a control box 31.
The material supplier 21 leads ball ingots 33 into a melting pot 36 of the melting frunace 22, wherethe ball ingots 33 is melted, through a supply shoot 35 turning spirally along the inner circumferential wall of a preheating case 34 and it also leads the exhaust heat of a molten metal 37, i.e. the ball ingots melted in the melting pot 36, to the preheating case 34to preheat the ball ingots while the ball ingots are being subjected to their temperature control by a control damper 39 connected to such a temperature sensor 38 as a thermocouple.
The molten metal 37 in the melting furnace 22 is supplied through a molten metal inlet 43 to a molten metal passage 44 of the injection mould cylinder 23 by a ladle 42 which is the molten metal supplier 32 of one kind when a cover 40 covering a part of the melting pot 36 is subjected to its open drive by a cylinder 41 for opening and closing the cover 40, as shown in Figure 15(a).
Detachably fixed to the fixed frame 24 holding the injection mould cylinder 23 with an injection piston 23a is a fixed mould 45 which is a forming mould and detachably fixed to the movable frame 25 movable back and forward regarding the fixed frame 24 is a movable mould 46 which also is a forming mould by mould clamping device 47, respectively.
As shown in Figure 12, the injection mould cylinder 23 is fixed to the fixed frame 24 on a base stand 52 by a supporting frame 48 with the bottom face of the moltem metal passage 44 rising gradually towards the tip end thereof. The fixed mould 45 is formed with a cylindrical hole 44b connected coaxially to an internal room 44a of the injection mould cylinder 23 at the tip end portion of the injection mould cylinder 23 and the molten metal passage 44 consists of the internal room 44a and the cylindrical hole 44b.
The movable mould 46 is formed with a recess portion 46a consisting of a clearance 49, i.e. transfer hole, blocking the end of the molten metal passage 44 at the time when the movable mould 46 abuts closely on the fixed mould 45, forming cavities 50 positioned at the right, left, up and down sides and gates 51 connecting between the respective forming cavities 50 and the clearance 49. On the other hand, the fixed mould 45 is provided with a recess portion 45a forming the forming cavities 50 integrally with the recess portion 46a at the time when the movable mould 46 abuts closely on the fixed mould 45.
A product 53 (refer to Figure 13) casted in the forming cavities 50 is pushed out from the movable mould 46 by a pushing-out device 54 at the time when the movable mould 46 is separated from the fixed mould 45 and it is supported at a product supporting position (shown with a one dotted chain line in Figure 9) by the product holding device 27.
The product holding device 27 consists substantially of a trimming die 55 having an engaging hole (not shown) holding the product 53 and a driving cyliner (not shown) driving the trimming die 55 together with a trim arm 56 back and forward from a horizontal direction between the movable mould 46 and the fixed mould 45 at the time when the movable mould 46 is separated from the fixed mould 45, and, when the product holding device 27 is moved between the movable mould 46 and the fixed mould 45, it is capable of holding the product 53 sticking to the movable mould 46 in the engaging hole of the trimming die 55.
The product holding device 27 is provided at its end portion with a plurality of nozzles 57 for applying mould separating agent as is an applying device, and, when the product holding device 27 holding the product 53 is separated from both the fixed and movable mould 45,46, the nozzles 57 are controlled in such a manner that the mould separating agent can be applied sufficiently to the recess portions 45a, 46a of the respective fixed and movable moulds45, 46 in accordance with a time control.
The product 53 holded in the trimming die 55 is subjected to a finishing work at a finishing position B (shown by a full line in Figure 9) below the space between the fixed and movable moulds 45, 46 by the product finishing device 28.
The product finishing device 28 consisting essentially of a punch 58 for pushing out the product 53 and a punch driving cylinder 59. The punch 58 is drived by the punch driving cylinder 59 to push out the respective products 53 through the trimming die 55 in the direction of the punch drive so that the burrs formed at the casting time and the residue remaining in the clearance 49 and/or the gate 51 are removed from the respective products 53.
The products 53 thus finished are packed in boxes 63 stopped momentarily on a conveyor 62 through a product whoot 61 every predetermined pieces.
On the other hand, the burrs, residue 60 and the like removed from the products 53 at the finish time are returned back to the melting furnace 22 by a recovering device 30 to be refused before they become cold completely.
In the recovering device 30 the burrs, residue 60 and the like are collected in a bucket (not shown) through a recovered material shoot 64 and when the burrs, residue 60 and the like collected reaches a predetermined amount, the bucket is elevated through an elevator 65 by the drive of a cylinder (not shown). The bucket is inclined when it reaches at the upper end position of the elevator 65 so that the burrs, residue 60 and the like in the bucket are thrown in a reproducing portion 68 of the melting furnace 22 sectioned with a net 67 through a throw-in melting furnace shoot 66.
A dross remover 69 removing the dross on the molten metal surface in the melting furnace 22 causes a dross catcher 71 to move from a position C to a position D in the direction of an arrow mark a by the drive of a driving cylinder 70 so as to catch the dross in the dross catcher 71 and it causes the dross catcher 71 to rotate from a position D to a position E centering a supporting point 72 so as to discharge the dross 73 catched into a dross receiver 74, as shown in Figures 14(a) and 14(b).
Description will now be given of operation of the above-stated casting equipment provided with a cold chamber die casting machine.
In the equipment shown in Figure 9, both the fixed and movable moulds 45,46 are fastened by the movable frame driving device 26 in accordance with operation of the control box 31 and the molten metal 37 is supplied from the melting furnace 22 into the molten metal passage 44 of the injection mould cylinder 23 by the molten metal supplier 32 (refer to
Figure 15(a)). The molten metal 37 supplied to the molten metal passage 44 is pushed out towards the clearance 49 by a low velocity drive of the injection piston 23a, as shown in Figure 15(b), whereby the air in the injection mould cylinder 23 is caused to flow in the forming cavities 50 to be drawn out therefrom through air dampers (not shown) prior to supply of the molten metal 37 to the forming cavities 50. Then, the molten metal 37 in the molten metal passage 44 is pushed into the forming cavities 50 through the clearance 49 and the gate 51 by a high velocity drive of the injection piston 23a, as shown in Figure 15(c), in which the injection piston 23a is drived until the tip end thereof reaches the inside of the clearance 49, so that the forming cavities 50 are filled with the molten metal 37 and the casting is conducted.
Both the fixed and movable moulds 45,46 are separated from each other under the condition that the product 53 is sticked on the movable mould 46, and the trimming die 55 is inserted between both the fixed and movable moulds 45,46, as shown with one dotted chain line in Figure 9.
The product 53 is pushed out from the movable mould 46 so as to be engaged with the engaging hole of the trimming die 55.
The trimming die 55 holding the product 53 is caused to leave from the space between both fixed and movable moulds 45,46 while the mould separating agent is being applied to the recess portions 45a, 46a of the respective fixed and movable moulds 45, 46.
Both the fixed and movable moulds 45,46 are fastened again and, thereafter, the next casting is carried out. On the other hand, the product 53 holded by the trimming die 55 is pushed out from the trimming die 55 by the punch 58 so that the burrs, residue 60 and the like formed integrally on the product 53 are removed. Then, the products 53 pushed out by the punch 58 so as to be subjected to the finishing work are packed in the box 63 on the conveyor 62 through the product shoot 61 every predetermined pieces. At the same time the burrs, residue 60 and the like are collected once in the bucket through the recovered material shoot 64, they are conveyed above the melting furnace 22 by the elevator 65 and thereafter they are thrown in the melting furnace 22 from the throw-in melting furnace shoot 66.
In the above embodiment the ball ingot 33 is used as a material for casting whereby the operation for supplying material can be conducted very smoothly, and the ball ingot 33 is preheated by use of the heat of the molten metal 37 whereby the thermal efficiency can be enhanced.
In addition, the injection angle of the nozzles 57 can be changed freely by changing the direction of the nozzles 57 mounted on the trimming die 55, so that the mould separating agent is applied uniformly to the recess portions 45a, 46a of the fixed and movable moulds 45, 46. Furthermore, the burrs, residue 60 and the like removed from the product 53 are collected rapidly in the bucket so as to the returned back to the melting furnace 22 whereby the collecting work is made simple, and therewith the burrs, residue 60 and the like are recovered in the melting furnace 22 before they become cold so that the thermal efficiency is improved in this point, too.
The present invention is not restricted to the above embodiment but the other embodiments will be described below.
In the above embodiment, the injection mould cylinder 23 is supported by the supporting frame 48 in such a manner that the tip end thereof is directed obliquely upwards to the fixed frame 24 and the fixed mould 45. As shown in Figure 16, however, the injection mould cylinder 23 is supported by the supporting frame 48 in the same manner as the prior art, i.e. in such a manner that the molten metal passage 44 becomes parallel substantially to the axis center line G-G of the die casting machine running through the fixed and movable moulds 45,46, and a base stand 75 is formed in a shape having a sectional view of a trapezoid so that the axis center line G-G can be inclined, that is the molten metal passage 44 can be inclined in the same manner as the abovedescribed embodiment.
Figures 17(a) through 17(d) showthe operation of the second embodiment shown in Figure 16. The second embodiment shown in Figures 17(a) to 17(d) is the substantially same as the first embodiment shown in Figures 15(a) to 15(d) regarding the supply of the molten metal 37 into the injection mould cylinder 23, the driving operation of the injection piston 23a and so on. Therefore, same reference numerals as shown in Figures 15(a) to 15(d) are used in Figures 17(a) to 17(d) to designate same or similar members, so that the descriptions thereof will be omitted.
Thus, the base stand in the prior die casting machine may only be changed to the base stand 75 according to the present invention. Accordingly, the present invention is applicable wide.
Next, in the above embodiments it will happen seldom that the temperature of the molten metal 37 in the tip end portion of the molten metal passage 44 is lowered and a part of the molten metal 37 supplied to the molten metal passage 44 is solidified due to the amount of the molten metal 37 in the tip end portion prior to the injection thereof. If the molten metal 37 is solidified prior to the injection thereof, it will happen that the product 53 becomes uneven due to the mixture of the molten metal 37 solidified and the other molten metal 37.In order to obviate this problem a dam plate 85 formed at its upper end with the substantially same curved face 85a as the inner circumferential face of the injection mould cylinder 23 is provided on the injection mould 23 close to the fixed frame 24 and it is movable in the upper and down directions, synchronized with the injection piston. Therefore, when the molten metal 37 is supplied to the molten metal passage 44 the dam plate 85 is elevated up to the position H shown with a full line in Figure 18 to dam the molten metal 37 (refer to Figure 19) so that the portion where the amount of the molten metal 37 is reduced in the same manner as shown in Figure 15(a) is not caused to occur.On the other hand, when the molten metal 37 is pushed in the forming cavities 50 by the injection piston 23a, the dam plate 85 is sinked down to the position I shown with one dotted clain line in
Figure 18 so that the molten metal 37 can be pushed smoothly into the forming cavities 50 without being prevented from being pushed therein. The dam plate 85 may be arranged not only close to the fixed frame 24 but also at the inside J of the fixed frame 24 shown with a chain line in Figure 18. The shape of the dam plate 85 is not limited to one having a sectional view of the rectangle shown in Figure 20(a) but the dam plate 85 having a sectional view of a circle can be used as shown in Figure 20(b). In case that the dam plate 85 shown in Figure 20(b) is used, the end portion of the molten metal 37 supplied to the molten metal passage 44 can be prevented from decreasing whereby the molten metal 37 with an even melt mixture can always be supplied to the forming cavities 50, that is, the product 53 having a uniform quality can always be casted.
Also, the product is not limited to one casted by the radial forming cavity radiated centering the clearance 49, as shown in Figure 13, but, for example, it may be a product 76 casted by a forming cavity surrounding the clearance 49 with a predetermined interval therebetween, as shown in Figures 21 (a) and 21(b).
Furthermore, used instead of the melting furnace 22 shown in Figure 11 can be a melting furnace 77 which is such constructed that the exhaust smoke occuring at the time of heating the melting pot 36 is caused to pass through the material supplier 21 to preheat the ball ingot 33 by the heat of the exhaust smoke, as shown in Figure 22. The melting furnace 77 is provided with a cylinder 78 used for opening and closing a supplying shoot, the cylinder 78 functioning to adjust the amount supply of the ball ingots 33, and a cover 79 used for sheltering the molten metal surface.
Moreover, the device shown in Figures 23, 24(a) and 24(b) can be used instead of the molten metal supplier 32. The device comprises a ladle 80, a supporting arm 81 having trapezoid cams 81a at its both side portions and provided at its lower end with the ladle 80, a pair of covers 82,82 for opening and closing molten metal surface being always closed by such a force as a spring force and a pair of elongated
portions 83, 83 elongated upwardly from the respective covers 82, 82 and formed at their upper end
portions with abutting portions 83a, 83a bent in the directions opposed to each other.As shown in
Figure 23, the narrow portion 81 b of the supporting
arm 81 is inserted between the abutting portions 83a, 83a of the elongated portions 83, 83, and thereafter the supporting arm 81 is lowered straight
down so that the abutting portions 83a, 83a slide the trapezoid cams 81 a, 81 a to open the covers 82,82
and the molten metal 37 flows in the ladle 80, as
shown in Figures 24(a) and 24(b). After this, the
supporting arm 81 is elevated and the covers 82, 82
are closed gradually in accordance with the elevation of the supporting arm 81, while the molten
metal in the ladle 81 is supplied to the molten metal
passage 44 through the molten metal inlet 43 of the
injection mould cylinder 23.
In the above structure the cylinder 41 is not
required so that a mechanism for opening and
closing the covers 82,82 can be simplified.
Claims (15)
1. A cold chamber die casting machine, which
comprises;
(a) a pair of moulds formed attheiropposed faces with recess portions, at least one forming
cavity being formed by the recess portions;
(b) a molten metal passage, one end portion
thereof being connected to the forming cavity and
the bottom face thereof being formed in a slope
rising gradually in the direction of the one end;
(c) a molten metal inlet formed at a middle
portion of the molten metal passage for pouring
molten metal in the molten metal passage; and
(d) an injection piston movable from the other
end of the molten metal massage towards the one
end thereof and pushing Lhe molten metal in the
forming cavity, whereby after the air remaining in
the molten metal passage is caused to flow in the forming cavity, the molten metal is pushed into the forming cavity to thereby decrease occurrence of blowholes and/or sinks in a product.
2. A cold chamber die casting machine as set forth in claim 1, wherein the axis center line of the moulds is horizontal and the axis center line of the molten metal passage is inclined to the axis center line of the moulds.
3. A cold chamber die casting machine as set forth in claim 1, wherein the axial center lines of the moulds and of the molten metal passage are coaxial or parallel to each other and both the axial center lines are inclined to a horizontal face.
4. A cold chamber die casting machine as set forth in claim 1, wherein the one end face of the molten metal passage is parallel substantially to the tip end face of the injection piston, whereby the amount of the molten metal remaining in the molten metal passage at the time of injection is reduced.
5. A cold chamber die casting machine as set forth in claim 1, wherein the molten metal inlet is positioned below the bottom face of the one end portion of the molten metal passage, whereby when the molten metal is poured in the molten metal
passage through the molten metal inlet the molten metal does not flow into the forming cavity from the one end portion of the molten metal passage prior to the injection, and the molten metal in the molten metal passage does not counter-flow out from the molten metal inlet due to the movement of the
injection piston.
6. A cold chamber die casting machine as set forth in claim 5, wherein the injection piston is
moved with a low velocity until the molten metal surface in the molten metal passage becomes the same level as the bottom face of the one end portion
of the molten metal passage and thereafter the
injection piston pushes the molten metal into the forming cavity with a high velocity.
7. A cold chamber die casting machine as set forth in claim 1,wherein a pluralityofforming cavities are formed radially centering the one end
portion of the molten metal passage.
8. A cold chamber die casting machine as set forth in claim 1, wherein the molten metal passage
comprises a cylinder housing the injection piston
therein and a hole formed in the mould coaxiallyto
the inside room of the cylinder.
9. A cold chamber die casting machine as set
forth in claim 1, wherein one of a pair of the moulds
is a movable mould, the other thereof being a fixed
mould, and the movable mould is provided with a
clearance blocking the one end portion of the molten
metal passage, the clearance being connected to the
forming cavity through a runner and a gate formed
between both the moulds.
10. A cold chamber die casting machine as set
forth in claim 1,wherein a part of the molten metal
passage is provided projectably from the bottom
face thereof with a dam plate and the movement of
the molten metal is restricted to thereby prevent the
temperature of the molten metal from decreasing at
the time of supply of the molten metal through the
molten metal inlet.
11. A cold chamber die casting machine as set forth in claim 10, wherein the upper end face of the dam plate is formed in the substantially same curved face as the inner circumferential face of the molten metal passage and the upper end of the dam plate does not prevent the injection piston from moving at the time of injection of the molten metal.
12. A cold chamber die casting machine, which comprises;
(a) a fixed frame;
(b) a movable frame movable regarding the fixed frame;
(c) a fixed mould fixed to the fixed frame;
(d) a movable mould mounted on the movable frame and capable of contacting the fixed mould, a forming cavity being formed between both the movable and fixed moulds at the time of the contact;
(e) a molten metal passage provided at its middle portion with a molten metal inlet, one end thereof being connected to the forming cavity and being positioned above the molten metal inlet owing to the inclination of the molten metal passage, whereby a molten metal supplied to the molten metal passage through the molten metal inlet is prevented from flowing in the forming cavity prior to injection of the molten metal; and
(f) an injection piston pushing the molten metal supplied to the molten metal passage into the forming cavity, the injection piston pushing the air in the molten metal passage into the forming cavity prior to pushing the molten metal into the forming cavity owing to the inclination of the molten metal passage whereby the amount of blowhole and sink occurring in a product is reduced.
13. A cold chamber die casting machine pushing molten metal in a forming cavity formed by a pair of moulds closed to each other through a clearance and a gate by an injection piston of an injection mould cylinderto obtain a casted product, wherein the bottom face of a molten metal passage from which the molten metal is pushed out to the clearance by the injection piston is formed in a slop face rising gradually in the direction of pushing out the molten metal.
14. A cold chamber die casting machine as set forth in claim 13, wherein the axial line of the cold chamber die casting machine crossing the moulds is parallel substantially to the longitudinal direction of the molten metal passage.
15. A cold chamber die casting machine substantially as hereinbefore described with reference to any of Figures 5 to 24(b).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10793382A JPS58224059A (en) | 1982-06-22 | 1982-06-22 | Die casting machine |
| JP13096582A JPS5921459A (en) | 1982-07-26 | 1982-07-26 | Die casting machine |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB8316797D0 GB8316797D0 (en) | 1983-07-27 |
| GB2123326A true GB2123326A (en) | 1984-02-01 |
| GB2123326B GB2123326B (en) | 1986-08-13 |
Family
ID=26447891
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB08316797A Expired GB2123326B (en) | 1982-06-22 | 1983-06-21 | Cold chamber die casting machine |
Country Status (5)
| Country | Link |
|---|---|
| KR (1) | KR910006207B1 (en) |
| CH (1) | CH663166A5 (en) |
| DE (1) | DE3322223A1 (en) |
| GB (1) | GB2123326B (en) |
| IT (1) | IT1212988B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5015995A (en) * | 1988-12-03 | 1991-05-14 | Stresswave Technology Limited | Fluid level monitor |
| WO1994011136A1 (en) * | 1992-11-17 | 1994-05-26 | Dbm Industries Ltd. | Cold chamber die casting machine injection system |
| US5787962A (en) * | 1992-11-17 | 1998-08-04 | Dbm Industries Ltd. | Cold chamber die casting casting machine and method |
| EP1060817A1 (en) * | 1999-06-04 | 2000-12-20 | Mitsui Mining and Smelting Co., Ltd | Pressure die-casting process of magnesium alloys |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050255189A1 (en) * | 2004-05-17 | 2005-11-17 | Manda Jan M | Method and apparatus for coupling melt conduits in a molding system and/or a runner system |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1270878A (en) * | 1968-10-22 | 1972-04-19 | Raymond E Cross | Improvements in and relating to die casting machines |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2532107B1 (en) * | 1975-07-18 | 1976-12-23 | Mahle Gmbh | Pressure die casting machine with inclined injection barrel - which facilitates escape of air and gas during injection |
| DE2624444A1 (en) * | 1976-06-01 | 1977-12-15 | Mahle Gmbh | Pressure die casting machine with inclined injector barrel - so melt can be poured into barrel before die closure |
-
1983
- 1983-06-21 IT IT8367687A patent/IT1212988B/en active
- 1983-06-21 DE DE19833322223 patent/DE3322223A1/en not_active Withdrawn
- 1983-06-21 GB GB08316797A patent/GB2123326B/en not_active Expired
- 1983-06-22 CH CH3418/83A patent/CH663166A5/en not_active IP Right Cessation
- 1983-06-22 KR KR1019830002811A patent/KR910006207B1/en not_active IP Right Cessation
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1270878A (en) * | 1968-10-22 | 1972-04-19 | Raymond E Cross | Improvements in and relating to die casting machines |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5015995A (en) * | 1988-12-03 | 1991-05-14 | Stresswave Technology Limited | Fluid level monitor |
| WO1994011136A1 (en) * | 1992-11-17 | 1994-05-26 | Dbm Industries Ltd. | Cold chamber die casting machine injection system |
| AU685403B2 (en) * | 1992-11-17 | 1998-01-22 | Dbm Industries Limited | Cold chamber die casting machine injection system |
| US5787962A (en) * | 1992-11-17 | 1998-08-04 | Dbm Industries Ltd. | Cold chamber die casting casting machine and method |
| EP1060817A1 (en) * | 1999-06-04 | 2000-12-20 | Mitsui Mining and Smelting Co., Ltd | Pressure die-casting process of magnesium alloys |
| US6467527B1 (en) | 1999-06-04 | 2002-10-22 | Mitsui Mining And Smelting Co., Ltd. | Pressure die-casting process of magnesium alloys |
Also Published As
| Publication number | Publication date |
|---|---|
| IT8367687A0 (en) | 1983-06-21 |
| KR840005030A (en) | 1984-11-03 |
| GB8316797D0 (en) | 1983-07-27 |
| DE3322223A1 (en) | 1984-01-26 |
| GB2123326B (en) | 1986-08-13 |
| IT1212988B (en) | 1989-12-07 |
| CH663166A5 (en) | 1987-11-30 |
| KR910006207B1 (en) | 1991-08-17 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |