CA1183324A - Vertical die casting device - Google Patents
Vertical die casting deviceInfo
- Publication number
- CA1183324A CA1183324A CA000396705A CA396705A CA1183324A CA 1183324 A CA1183324 A CA 1183324A CA 000396705 A CA000396705 A CA 000396705A CA 396705 A CA396705 A CA 396705A CA 1183324 A CA1183324 A CA 1183324A
- Authority
- CA
- Canada
- Prior art keywords
- tip
- die casting
- counter
- casting device
- gate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Landscapes
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
In the vertical die casting device of this invention, the molten metal is poured from the gate into the sleeve with the cavity gate closed by the counter tip; and when filling the cavity with the molten metal, the plunger tip and the counter tip are lowered at the same speed so as not to pressurize the molten metal held between the tips to prevent the temperature reduction of molten metal so that when the counter tip opens the cavity gate with the plunger tip continuing to move down the molten metal can smoothly flow into the cavity.
In the vertical die casting device of this invention, the molten metal is poured from the gate into the sleeve with the cavity gate closed by the counter tip; and when filling the cavity with the molten metal, the plunger tip and the counter tip are lowered at the same speed so as not to pressurize the molten metal held between the tips to prevent the temperature reduction of molten metal so that when the counter tip opens the cavity gate with the plunger tip continuing to move down the molten metal can smoothly flow into the cavity.
Description
~ ~;3,3~LlL
B~CKGRO~ND OF ~HE I~VE~IT10~
This invention relates to a vertlcal die casting device which consists of a sleeve connecting the pouring gate and the cavity gate and of a plunger tip inserted in the upper portion of -the sleeve Eor injec-ting mol-ten metal under pressure and a counter tip inserted in the lower portion of the sleeve for guiding the molten metal into the cavity gate. More particularly this invention relates to a vertical die casting device in which the counter tip is made .o retract at the same time and a-t the same speed as the plunger tip moves down so that the molten metal can be poured, without being pressurized, into cavity.
In the conventional vertical die casting devices, a plunger tip and counter tip are disposed opposite to each other in a sleeve that connects the pouring gate and the cavity gate. When the counter tip is at a position that closes the cavity gate, molten metal i.s poured from the gate into the sleeve and then the plunger tip is forced down by a proper pressure application mechanism to apply pressure to the molten metal so as to push down the counter tip via the pressurized molten metal and cause the molten metal to flow into the cavity through the cavity gate.
This construction, however, has disadvantages:
that is, since the molten metal i.n the sleeve is pressurized between the plunger tip and the counter tip, the resulting increase in adhesion between the mol.ten metal and the sleeve or the tips allows more heat to be transferred to the sleeve and tips, resulting in reduction in -the temperature of molten metal. This can prevent a smoo-th flowing of -t.he mo:Lten me-tal ~ . ~
lb/' -1-into the vacity or recluce the life of ~he sleeve and tips.
SUM~RY OF THE~ INVENTION
The primary object of the invention is to provide a vertical die casting device which overcomes the above-mentioned drawbacks of the conventional die casting devices by leading the molten metal poured in the sleeve into the cavity without pressurizing the molten metal.
Briefly stated, the present invention is a vertical die casting device comprising: a pouring gate; a cavity gate located below the pouring gate; a sleeve connecting the pouring gate and the cavity gate; an injection plunger tip inserted in the upper portion of the sleeve and a counter tip inserted in the lower portion of the sleeve with the plunger tip and the counter tip disposed opposite to each other; a retracting mechanism linked to the counter tip; a pressure applying mechan-ism to activate the plunger tip; lowerins speed regulators pro-vided to the retracting mechanism and the pressure applying mechanism so as to activate both mechanisms at the same speed;
and a controller to activate the pressure applying mechanism and the retracting mechanism in synchronism with each other.
BRIEF DESCRIPTION OF THE DRAWINGS
Figure 1 is an explanatory drawing showing the conventional die casting technique; and Figu;-e 2 is a cross section of the vertical die casting device embodyin{J the present invention.
lb/'~, -2-DESCRIPTION OF THE PREFE~RED EMBODIMENT
Designated 7 is a vertical die casting device which has a cavity 10 formed between the upper die 8 and the lower die 9.
A sleeve 11 is vert:Lcally disposed with the lower portion comm~micating wi~h the cavity 10 through the cavity gate 12 and with the upper portion having a slant pouring gate 13.
The sleeve 11 has an injection plunger tip 14 inserted in the upper porti.on ther~of and a counter tip 15 in the lower portion in such a way that they face each other. The plunger tip 14 is connected through a rod 16 to a hydraulic cylinder 17 as a pressure applying mechanism, and the counter tip 15 is conencted through the rod 18 to a hydraulic cylinder 19 as a retracting mechanism.
The hydraulic cylinder 19 is equal in diameter to the other hydraul:ic cylinder 17.
The hydraulic cylinder 17 has a pis-~on 20 connected with the rod 16 to form an upper chamber 21 and a lower chamber 22, both of these chambers being interconnect~d by an oil pipe 23 with a pump 24 and a solenoid changeover valve 25 provided on the pipe 23. The pump 24 and the solenoid changeover valve 25 are connectQd to a controller 26.
The other hydraulic cylinder 19 also has a piston 27 to form an upper chamber 28 and a :I.ower chamber 29, both of which are interconnected by an oil pipe 30 with a pump 31 and a solenoid changeover valve 32 installed on the pipe 30~ The solenoid changeover valve 32, the limit swi.tch 33 activated by a device fitted to the rod 16, another limit switch 34 activated by a device fitted -to the rod 18, and the pump 31 are all connected to the controller 260 The pump 31 and the solenoid changeover valve 32 are activated by the controller 26 when the plunger tip 14 reaches the lower edge of the-pouring ga~e 13 and the upp~r surface of the counter tip 15 reaches the lower edge of the cavity gate 12.
The flow regulating valves 35, 36 provided in the oil pipes 23, 30 serve as speed controllers that cause the plunger tip 14 and the counter tip 15 to move down at the same speed, by controlling the oil flows entering the upper chambers 21 and 28 of the cylinders 17, 18 ~o be equal. Designated 37 is a molten metal.
The process of die casting using the vertical die casting device of the above construction will be explained with reference to Figure 2. First, the solenoid changéover valv~ 25 is shifted to the b mode as shown and the other solenoid changeover valve 32 is energized to shift to the a mode to lift the plunger tip 14 and the counter tip 15. The pouring gate 13 is ~ 3 ~
then opened and the cavity gate is closed by the side of the counter tip 15~
As the molten metal 37 is poured from the gate 13 into the sleeve 11, the molten metal 37 will stay in ~he sleeve 11 on the counter tip 15 as shown.
Next, when a command signal is given to the controller 26 to shlft the solenoid valve 2S to the a mode and operate the pump 24, the pressurized oil is then delivered into the upper chamber 21 of the cylinder 17 causing the piston 20 and the plunger tip 14 to move down.
When the plunger tip 14 reaches the lower edge of the pouring gate 13, iOe., the upper surface o:f the molten metal 37, a signal from the limit switch 33 shi~ts the solenoid valve 32 to the _ mode and operates the pump 31 to deliver the oil pressure to the upper chamber 28 of the cylinder 19 causing the piston 27 and the countPr tip 15 to move down. The flow rates of pressurized oil entering the upper chambers of the cylinders 17, 19 are controlled by the flow regulating valves 35, 36 so that they are virtually equal. Since the diameters of the hydraulic cylinders 17, 19 are the same, the plunger tip 14 and the counter tip 15 move down at the same speed.
Therefore, when the plunger tip 14 and the counter tip 15 are moving downward, no pressure is applied to the molten metal 37 held between them, so that heat transfer from the mol~en metal 37 to the sleeve 11 or the tips 14, 15 cannot easily occur.
Now, when the upper surface of the counter tip 15 reaches the lower edge of the cavity gate 12, a signal from the limit switch 34 causes the pump 31 to stop as well as the counter tip movement.
As a resultl the plunger tip 14 that continues moving down causes the molten metal 37 -to flow into the cavity 10 through the cavity gate 12. At this time becasue the temperature decrease of the molten metal 37 is kept minimum as explained earlier, the molten metal can smoothly flow into the cavity.
With the above process completed, the upper die 8 and the lower die 9 are separated to take a product out of the cavity 10.
- The, the upper and lower dies are again clamped together; the solenoid changeover valve 25 is changed over to the _ mode and the solenoid valve 32 to the a mode; and the pumps 24, 31 are operated to return the plunger tip 14 and the counter tip 15 to their upper positions, as shown in Figure 2, to repeat the die casting process described above.
It should be noted that this invention is not limited to the above embodiment alone and various modifi-cations are possible. For instance, the mechanism for lowerlng the plunger tip and counter tip may be replaced with the combination of motor and gear instead of the hydraulic cylinders.
As can be seen in the foregoing, since the pressure ~pplying mechanism for the injection plunger tip and th~e mechanism for lowering the counter tip are activated in synchronism with each other, the molten metal is not pressurized in the sleeve by the opposing plunger tip and counter tip, so that the adhesion between the molten metal and the sleeve or tips is kept from increasing and the molten metal temperature maintained, thus assuring the smooth flow of molten metal into the cavity and therefore a good cast product.
Furthermore, since khe molten metal is not pressurized, it will not enter between the sleeve and the tips and this prevents the sticking of sleeve and tips and elongates their life.
B~CKGRO~ND OF ~HE I~VE~IT10~
This invention relates to a vertlcal die casting device which consists of a sleeve connecting the pouring gate and the cavity gate and of a plunger tip inserted in the upper portion of -the sleeve Eor injec-ting mol-ten metal under pressure and a counter tip inserted in the lower portion of the sleeve for guiding the molten metal into the cavity gate. More particularly this invention relates to a vertical die casting device in which the counter tip is made .o retract at the same time and a-t the same speed as the plunger tip moves down so that the molten metal can be poured, without being pressurized, into cavity.
In the conventional vertical die casting devices, a plunger tip and counter tip are disposed opposite to each other in a sleeve that connects the pouring gate and the cavity gate. When the counter tip is at a position that closes the cavity gate, molten metal i.s poured from the gate into the sleeve and then the plunger tip is forced down by a proper pressure application mechanism to apply pressure to the molten metal so as to push down the counter tip via the pressurized molten metal and cause the molten metal to flow into the cavity through the cavity gate.
This construction, however, has disadvantages:
that is, since the molten metal i.n the sleeve is pressurized between the plunger tip and the counter tip, the resulting increase in adhesion between the mol.ten metal and the sleeve or the tips allows more heat to be transferred to the sleeve and tips, resulting in reduction in -the temperature of molten metal. This can prevent a smoo-th flowing of -t.he mo:Lten me-tal ~ . ~
lb/' -1-into the vacity or recluce the life of ~he sleeve and tips.
SUM~RY OF THE~ INVENTION
The primary object of the invention is to provide a vertical die casting device which overcomes the above-mentioned drawbacks of the conventional die casting devices by leading the molten metal poured in the sleeve into the cavity without pressurizing the molten metal.
Briefly stated, the present invention is a vertical die casting device comprising: a pouring gate; a cavity gate located below the pouring gate; a sleeve connecting the pouring gate and the cavity gate; an injection plunger tip inserted in the upper portion of the sleeve and a counter tip inserted in the lower portion of the sleeve with the plunger tip and the counter tip disposed opposite to each other; a retracting mechanism linked to the counter tip; a pressure applying mechan-ism to activate the plunger tip; lowerins speed regulators pro-vided to the retracting mechanism and the pressure applying mechanism so as to activate both mechanisms at the same speed;
and a controller to activate the pressure applying mechanism and the retracting mechanism in synchronism with each other.
BRIEF DESCRIPTION OF THE DRAWINGS
Figure 1 is an explanatory drawing showing the conventional die casting technique; and Figu;-e 2 is a cross section of the vertical die casting device embodyin{J the present invention.
lb/'~, -2-DESCRIPTION OF THE PREFE~RED EMBODIMENT
Designated 7 is a vertical die casting device which has a cavity 10 formed between the upper die 8 and the lower die 9.
A sleeve 11 is vert:Lcally disposed with the lower portion comm~micating wi~h the cavity 10 through the cavity gate 12 and with the upper portion having a slant pouring gate 13.
The sleeve 11 has an injection plunger tip 14 inserted in the upper porti.on ther~of and a counter tip 15 in the lower portion in such a way that they face each other. The plunger tip 14 is connected through a rod 16 to a hydraulic cylinder 17 as a pressure applying mechanism, and the counter tip 15 is conencted through the rod 18 to a hydraulic cylinder 19 as a retracting mechanism.
The hydraulic cylinder 19 is equal in diameter to the other hydraul:ic cylinder 17.
The hydraulic cylinder 17 has a pis-~on 20 connected with the rod 16 to form an upper chamber 21 and a lower chamber 22, both of these chambers being interconnect~d by an oil pipe 23 with a pump 24 and a solenoid changeover valve 25 provided on the pipe 23. The pump 24 and the solenoid changeover valve 25 are connectQd to a controller 26.
The other hydraulic cylinder 19 also has a piston 27 to form an upper chamber 28 and a :I.ower chamber 29, both of which are interconnected by an oil pipe 30 with a pump 31 and a solenoid changeover valve 32 installed on the pipe 30~ The solenoid changeover valve 32, the limit swi.tch 33 activated by a device fitted to the rod 16, another limit switch 34 activated by a device fitted -to the rod 18, and the pump 31 are all connected to the controller 260 The pump 31 and the solenoid changeover valve 32 are activated by the controller 26 when the plunger tip 14 reaches the lower edge of the-pouring ga~e 13 and the upp~r surface of the counter tip 15 reaches the lower edge of the cavity gate 12.
The flow regulating valves 35, 36 provided in the oil pipes 23, 30 serve as speed controllers that cause the plunger tip 14 and the counter tip 15 to move down at the same speed, by controlling the oil flows entering the upper chambers 21 and 28 of the cylinders 17, 18 ~o be equal. Designated 37 is a molten metal.
The process of die casting using the vertical die casting device of the above construction will be explained with reference to Figure 2. First, the solenoid changéover valv~ 25 is shifted to the b mode as shown and the other solenoid changeover valve 32 is energized to shift to the a mode to lift the plunger tip 14 and the counter tip 15. The pouring gate 13 is ~ 3 ~
then opened and the cavity gate is closed by the side of the counter tip 15~
As the molten metal 37 is poured from the gate 13 into the sleeve 11, the molten metal 37 will stay in ~he sleeve 11 on the counter tip 15 as shown.
Next, when a command signal is given to the controller 26 to shlft the solenoid valve 2S to the a mode and operate the pump 24, the pressurized oil is then delivered into the upper chamber 21 of the cylinder 17 causing the piston 20 and the plunger tip 14 to move down.
When the plunger tip 14 reaches the lower edge of the pouring gate 13, iOe., the upper surface o:f the molten metal 37, a signal from the limit switch 33 shi~ts the solenoid valve 32 to the _ mode and operates the pump 31 to deliver the oil pressure to the upper chamber 28 of the cylinder 19 causing the piston 27 and the countPr tip 15 to move down. The flow rates of pressurized oil entering the upper chambers of the cylinders 17, 19 are controlled by the flow regulating valves 35, 36 so that they are virtually equal. Since the diameters of the hydraulic cylinders 17, 19 are the same, the plunger tip 14 and the counter tip 15 move down at the same speed.
Therefore, when the plunger tip 14 and the counter tip 15 are moving downward, no pressure is applied to the molten metal 37 held between them, so that heat transfer from the mol~en metal 37 to the sleeve 11 or the tips 14, 15 cannot easily occur.
Now, when the upper surface of the counter tip 15 reaches the lower edge of the cavity gate 12, a signal from the limit switch 34 causes the pump 31 to stop as well as the counter tip movement.
As a resultl the plunger tip 14 that continues moving down causes the molten metal 37 -to flow into the cavity 10 through the cavity gate 12. At this time becasue the temperature decrease of the molten metal 37 is kept minimum as explained earlier, the molten metal can smoothly flow into the cavity.
With the above process completed, the upper die 8 and the lower die 9 are separated to take a product out of the cavity 10.
- The, the upper and lower dies are again clamped together; the solenoid changeover valve 25 is changed over to the _ mode and the solenoid valve 32 to the a mode; and the pumps 24, 31 are operated to return the plunger tip 14 and the counter tip 15 to their upper positions, as shown in Figure 2, to repeat the die casting process described above.
It should be noted that this invention is not limited to the above embodiment alone and various modifi-cations are possible. For instance, the mechanism for lowerlng the plunger tip and counter tip may be replaced with the combination of motor and gear instead of the hydraulic cylinders.
As can be seen in the foregoing, since the pressure ~pplying mechanism for the injection plunger tip and th~e mechanism for lowering the counter tip are activated in synchronism with each other, the molten metal is not pressurized in the sleeve by the opposing plunger tip and counter tip, so that the adhesion between the molten metal and the sleeve or tips is kept from increasing and the molten metal temperature maintained, thus assuring the smooth flow of molten metal into the cavity and therefore a good cast product.
Furthermore, since khe molten metal is not pressurized, it will not enter between the sleeve and the tips and this prevents the sticking of sleeve and tips and elongates their life.
Claims
We claim:
(1) A vertical die casting device comprising:
a pouring gate; a cavity gate located below the pouring gate; a sleeve connecting the pouring gate and the cavity gate; an injection plunger tip inserted in the upper portion of the sleeve and a counter tip inserted in the lower portion of the sleeve with the plunger tip and the counter tip disposed opposite to each other; a retracting mechanism linked to the counter tip; a pressure applying mechanism to activate the plunger tip; lowering speed regulators provided to the retracting mechanism and the pressure applying mechanism so as to activate both mechanisms at the same speed; and a controller to activate the pressure applying mechanism and the retracting mechanism in synchronism with each other.
(2) A vertical die casting device as set forth in claim 1, wherein the retracting mechanism and the pressure applying mechanism are constructed of hydraulic cylinders, and the lowering speed regulators are a flow regulating valve.
(3) A vertical die casting device as set forth in claim 2, wherein the stroke of the hydraulic cylinders is controlled by limit switches.
(4) A vertical die casting device as set forth in claim 1, wherein the retracting mechanism and the pressure applying mechanism are constructed of electric motors and gears.
(5) A vertical die casting device as set forth in claim 1, wherein the controller operates in such a manner that when the plunger tip has closed the pouring gate, the plunger tip and the counter tip are made to move down together.
(6) A vertical die casting device as set forth in claim 5, wherein the controller operates in such a manner that when the counter tip has reached the lower edge of the cavity gate, the counter tip is made to stop while the plunger tip is made to continue moving down.
(1) A vertical die casting device comprising:
a pouring gate; a cavity gate located below the pouring gate; a sleeve connecting the pouring gate and the cavity gate; an injection plunger tip inserted in the upper portion of the sleeve and a counter tip inserted in the lower portion of the sleeve with the plunger tip and the counter tip disposed opposite to each other; a retracting mechanism linked to the counter tip; a pressure applying mechanism to activate the plunger tip; lowering speed regulators provided to the retracting mechanism and the pressure applying mechanism so as to activate both mechanisms at the same speed; and a controller to activate the pressure applying mechanism and the retracting mechanism in synchronism with each other.
(2) A vertical die casting device as set forth in claim 1, wherein the retracting mechanism and the pressure applying mechanism are constructed of hydraulic cylinders, and the lowering speed regulators are a flow regulating valve.
(3) A vertical die casting device as set forth in claim 2, wherein the stroke of the hydraulic cylinders is controlled by limit switches.
(4) A vertical die casting device as set forth in claim 1, wherein the retracting mechanism and the pressure applying mechanism are constructed of electric motors and gears.
(5) A vertical die casting device as set forth in claim 1, wherein the controller operates in such a manner that when the plunger tip has closed the pouring gate, the plunger tip and the counter tip are made to move down together.
(6) A vertical die casting device as set forth in claim 5, wherein the controller operates in such a manner that when the counter tip has reached the lower edge of the cavity gate, the counter tip is made to stop while the plunger tip is made to continue moving down.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000396705A CA1183324A (en) | 1982-02-22 | 1982-02-22 | Vertical die casting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000396705A CA1183324A (en) | 1982-02-22 | 1982-02-22 | Vertical die casting device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1183324A true CA1183324A (en) | 1985-03-05 |
Family
ID=4122124
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000396705A Expired CA1183324A (en) | 1982-02-22 | 1982-02-22 | Vertical die casting device |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1183324A (en) |
-
1982
- 1982-02-22 CA CA000396705A patent/CA1183324A/en not_active Expired
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |