CN203972817U - A kind of oil return control device of press-shoot oil cylinder of die casting - Google Patents
A kind of oil return control device of press-shoot oil cylinder of die casting Download PDFInfo
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- CN203972817U CN203972817U CN201420344699.9U CN201420344699U CN203972817U CN 203972817 U CN203972817 U CN 203972817U CN 201420344699 U CN201420344699 U CN 201420344699U CN 203972817 U CN203972817 U CN 203972817U
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Abstract
The utility model relates to compression casting technical field, relate in particular to a kind of oil return control device of press-shoot oil cylinder of die casting, comprise injection oil cylinder and valve plate, the end of injection oil cylinder is connected with barrel, barrel offers charging aperture, and injection oil cylinder offers oil-out, and valve plate is communicated with the oil-out of injection oil cylinder, it is characterized in that: also comprise the first inserted valve, the second inserted valve and electromagnetic direction valve, the first inserted valve, the second inserted valve and electromagnetic direction valve are all installed on valve plate; In the first inserted valve, be provided with the throttle orifice that diameter is 1.3mm and 1.8mm, the first inserted valve and the second inserted valve are connected in parallel; Injection oil cylinder is in the time of low-speed motion, by the first inserted valve oil return; Injection oil cylinder is in the time of high-speed motion, by the first inserted valve and the common oil return of the second inserted valve.The utility model has been realized in the even running of low-speed motion stage, runs slowly, thereby ensured the quality of die casting product and realize at the end in high-speed motion stage.
Description
Technical field
The utility model relates to compression casting technical field, relates in particular to a kind of oil return control device of press-shoot oil cylinder of die casting.
Background technology
In the oil return control device of traditional press-shoot oil cylinder of die casting, generally adopt a large latus rectum inserted valve, the oral fluid stream that goes out of injection oil cylinder is controlled.On the one hand, press-shoot oil cylinder of die casting is in the time of low-speed motion, when the moment that this large latus rectum inserted valve is opened, the hydraulic oil large latus rectum inserted valve that passes through quick and large flow in injection oil cylinder rod end chamber is back to fuel tank, this kind of structural design is not steady while often causing oil cylinder low-speed motion because the workpiece of injection oil cylinder has preshoot, cause the molten metal in barrel to be involved in air, thereby have influence on the quality of die casting; On the other hand, according to extrusion process theory, the injection energy E that high speed filling end applies product, can, according to its injection speed V, the quality of injection oil cylinder piston portion and the quality W of injection rod, calculate by following formula: injection energy: E=W (V)
2/ 2g; In formula: W: (quality of the quality+injection rod of injection oil cylinder piston portion) kg; V: injection speed m/s; G: acceleration of gravity 9.8 m/s
2; From above-mentioned computing formula, can find out, injection energy E when high speed filling and injection speed V square are directly proportional, when injection energy E in the time of high speed filling is excessive, easily make high speed injection end that product finning easily occurs, the injection energy of the generation of finning that also can prove product in production practices during mostly due to high speed filling is excessive caused.
Therefore, need badly and provide one that injection oil cylinder is run slowly in the even running of low-speed motion stage and the end realization of high-speed motion stage, thereby ensure the oil return control device of the press-shoot oil cylinder of die casting of die casting product quality.
Utility model content
The purpose of this utility model is to provide a kind of injection oil cylinder to realize in the even running of low-speed motion stage and high-speed motion stage end the oil return control device running slowly for the deficiencies in the prior art, thereby ensures the quality of die casting product.
For achieving the above object, the oil return control device of a kind of press-shoot oil cylinder of die casting of the present utility model, comprise injection oil cylinder and valve plate, the end of injection oil cylinder is connected with barrel, barrel offers charging aperture, and injection oil cylinder offers oil-out, and valve plate is communicated with the oil-out of injection oil cylinder, also comprise the first inserted valve, the second inserted valve and electromagnetic direction valve, the first inserted valve, the second inserted valve and electromagnetic direction valve are all installed on valve plate; In the first inserted valve, be provided with the throttle orifice that diameter is 1.3mm and 1.8mm, the first inserted valve and the second inserted valve are connected in parallel; Injection oil cylinder is in the time of low-speed motion, by the first inserted valve oil return; Injection oil cylinder is in the time of high-speed motion, by the first inserted valve and the common oil return of the second inserted valve.
Wherein, the oil-out of described injection oil cylinder is connected in parallel with the input A1 mouth of the first inserted valve and the input B1 mouth of the second inserted valve respectively; 2 mouthfuls of the output terminals A of the first inserted valve and the output B2 mouth of the second inserted valve are communicated with fuel tank respectively.
Wherein, described the first inserted valve is (0.22 ~ 0.24) with the area of passage ratio of the second inserted valve: 1.
Wherein, described the first inserted valve is 0.23:1 with the area of passage ratio of the second inserted valve.
Wherein, described the first inserted valve is (0.42 ~ 0.44) with the opening pressure ratio of the second inserted valve: 1.
Wherein, described the first inserted valve is 0.43:1 with the opening pressure ratio of the second inserted valve.
Wherein, the switch of the switch of described the first inserted valve and the second inserted valve is all electrically connected with electromagnetic direction valve, and by this electromagnetic direction valve control.
Wherein, described the first inserted valve close the orifices controls that oil circuit is 1.3mm by diameter, the orifices controls that the unlatching oil circuit of the first inserted valve is 1.8mm by diameter.
The beneficial effects of the utility model: the oil return control device of a kind of press-shoot oil cylinder of die casting of the present utility model, when work, the first step, injection oil cylinder, with slower speed V1 motion, advances molten metal the charging aperture of barrel; Second step, injection oil cylinder with speed V2(faster wherein: V2 > V1) molten metal is shifted onto to the ingate of mould, and this process can not have the phenomenon of molten metal turnup, avoid being involved in air; The 3rd step, injection oil cylinder is with very high speed V3(wherein: V3 > V2) molten metal is advanced to dies cavity fast by ingate, end at a high speed need a deceleration process V4 until speed V=0 to prevent the generation of phenomenon of overlap.The utility model has been realized in the even running of low-speed motion stage, runs slowly, thereby ensured the quality of die casting product and realize at the end in high-speed motion stage.
Brief description of the drawings
Fig. 1 is structure cut-away illustration of the present utility model.
Fig. 2 is that the movement velocity of injection oil cylinder of the present utility model changes schematic diagram.
Fig. 3 is the schematic diagram of the oil return control loop of injection oil cylinder of the present utility model.
Reference numeral comprises:
10-injection oil cylinder, 11-oil-out, 12-rod end chamber, 13-plunger shaft
20-valve plate, 30-barrel, 31-charging aperture the 40-the first inserted valve
41-throttle orifice, 50-the second inserted valve 60-electromagnetic direction valve 70-fuel tank.
Detailed description of the invention
Below in conjunction with accompanying drawing, the utility model is described in detail.
As shown in Figure 1 to Figure 3, the oil return control device of a kind of press-shoot oil cylinder of die casting of the present utility model, comprise injection oil cylinder 10 and valve plate 20, the end of injection oil cylinder 10 is connected with barrel 30, barrel 30 offers charging aperture 31, and injection oil cylinder 10 offers oil-out 11, and valve plate 20 is communicated with the oil-out 11 of injection oil cylinder 10, also comprise that the first inserted valve 40, the second inserted valve 50 and electromagnetic direction valve 60, the first inserted valves 40, the second inserted valve 50 and electromagnetic direction valve 60 are all installed on valve plate 20; Throttle orifice 41, the first inserted valves 40 and the second inserted valve 50 that in the first inserted valve 40, are provided with diameter and are 1.3mm and 1.8mm are connected in parallel; Injection oil cylinder 10 is in the time of low-speed motion, by the first inserted valve 40 oil returns; Injection oil cylinder 10 is in the time of high-speed motion, by the first inserted valve 40 and the common oil return of the second inserted valve 50; Wherein, the oil-out 11 of described injection oil cylinder 10 is connected in parallel with the input A1 mouth of the first inserted valve 40 and the input B1 mouth of the second inserted valve 50 respectively; 2 mouthfuls of the output terminals A of the first inserted valve 40 and the output B2 mouth of the second inserted valve 50 are communicated with fuel tank 70 respectively.
Wherein, opening pressure as the active area of the B1 mouth of the second inserted valve 50 inputs, F1 as the first inserted valve 40 of the active area of the input A1 mouth taking a1 as the first inserted valve 40, a2, F2 are the opening pressure (a1, a2, F1 and F2 all do not indicate in the drawings) of the second inserted valve 50; In injection oil cylinder 10, be provided with rod end chamber 12 and plunger shaft 13.Specific works process as shown in Figure 3, the hydraulic oil that the logical low discharge pressure of plunger shaft 13 of giving injection oil cylinder 10 is P, the electromagnet of electromagnetic direction valve 60 obtains electric simultaneously, the next work of electromagnetic direction valve 60, the B mouth of electromagnetic direction valve 60 is communicated with T mouth, A mouth and P mouth logical, the pressure of the rod end chamber 12 of injection oil cylinder 10 is P1, hydraulic oil by the first inserted valve 40 interior settings throttle orifice 41, the A2 mouth of A, the B of electromagnetic direction valve 60, P, T mouth, the first inserted valve 40 leads to fuel tank 70; In the time of P1a1>F1, because the spool of the first inserted valve 40 is provided with damping head, the first inserted valve 40 is opened without impacting, and the hydraulic oil of rod end chamber 12 flows back to fuel tank 70 by A1, A2; Due to injection oil cylinder 10 microinchings, the hydraulic fluid flow rate passing through is little, now F2>P1a2>P1a1>F 1, the second inserted valve 50 is still closed, only the first inserted valve 40 is worked, piston rod at a slow speed section steadily travel forward with low speed V1, V2.
And in the time that piston rod movement arrives high speed end, speed starts to decline, return oil pressure P1 connects fuel tank 70 by the first inserted valve 40 and the second inserted valve 50, when P1 pressure drop is to F2>P1a2>P1a1>F 1, the second inserted valve 50 is closed immediately, the first inserted valve 40 works on, and the rod end chamber of injection oil cylinder 10 12 is realized and being slowed down by the first inserted valve 40, the impact energy when reducing injection.
The utility model has been realized in the even running of low-speed motion stage, runs slowly, thereby ensured the quality of die casting product and realize at the end in high-speed motion stage.
According to test, by the area of passage Proportionality design of the first inserted valve 40 and the second inserted valve 50 in (0.22 ~ 0.24): in 1 value range, there is preferably effect; Be preferably 0.23:1 by the area of passage Proportionality design of the first inserted valve 40 and the second inserted valve 50, the best results that it can reach.
According to test, by the opening pressure Proportionality design of the first inserted valve 40 and the second inserted valve 50 in (0.42 ~ 0.44): 1; Be preferably 0.43:1 by the opening pressure Proportionality design of the first inserted valve 40 and the second inserted valve 50, the best results that it can reach.
In the present embodiment, the switch of the switch of described the first inserted valve 40 and the second inserted valve 50 is all electrically connected with electromagnetic direction valve 60, and controls by this electromagnetic direction valve 60; The throttle orifice 41 that oil circuit is 1.3mm by diameter of closing of described the first inserted valve 40 is controlled, and the throttle orifice 41 that the unlatching oil circuit of the first inserted valve 40 is 1.8mm by diameter is controlled.Wherein, the first inserted valve 40 is specially low opening pressure and spool band damping head, and the throttle orifice 41 that keying effect is 1.3mm and 1.8mm by diameter is controlled, and the second inserted valve 50 is specially the not inserted valve with damping head of large latus rectum, high opening pressure and spool.According to hydrodynamics, be following formula by the flow of throttle orifice 41 or cone valve and the pass of Pressure Drop: Q
2=KA △ P; In formula: Q is the flow passing through; K is discharge coefficient; A is area of passage; △ P is the Pressure Drop of importing and exporting.From above formula, find out, square being directly proportional to the Pressure Drop of importing and exporting of flow by throttle orifice 41 or cone valve, larger by the flow of Hydraulic Elements, the Pressure Drop of import and export is larger, cause injection oil cylinder 10 workpieces to have the phenomenon of preshoot, not steady while often causing oil cylinder low-speed motion.The inserted valve with damping head (the second inserted valve 50) is not in parallel with the inserted valve (the first inserted valve 40) of a little latus rectum, low opening pressure and spool band damping head to adopt large latus rectum, high opening pressure and a spool, make injection oil cylinder 10 in the time of low-speed motion by little inserted valve oil return, when high-speed motion, by large and small two common oil returns of inserted valve, high speed end is realized the oil return control by low speed → at a high speed → low-speed motion to injection oil cylinder 10 by little inserted valve.
Known the utility model is to have above-described good characteristic in sum, is made it manufacture assembling and use, and promotes the usefulness not having in conventional art and has practicality, becomes a novel product structure that has a practical value.
Above content is only preferred embodiment of the present utility model, for those of ordinary skill in the art, according to thought of the present utility model, all will change in specific embodiments and applications, this description should not be construed as restriction of the present utility model.
Claims (7)
1. the oil return control device of a press-shoot oil cylinder of die casting, comprise injection oil cylinder (10) and valve plate (20), the end of injection oil cylinder (10) is connected with barrel (30), barrel (30) offers charging aperture (31), injection oil cylinder (10) offers oil-out (11), valve plate (20) is communicated with the oil-out (11) of injection oil cylinder (10), it is characterized in that: also comprise the first inserted valve (40), the second inserted valve (50) and electromagnetic direction valve (60), the first inserted valve (40), the second inserted valve (50) and electromagnetic direction valve (60) are all installed on valve plate (20), in the first inserted valve (40), be provided with the throttle orifice that diameter is 1.3mm and 1.8mm (41), the first inserted valve (40) is connected in parallel with the second inserted valve (50), injection oil cylinder (10) is in the time of low-speed motion, by the first inserted valve (40) oil return, injection oil cylinder (10) is in the time of high-speed motion, by the first inserted valve (40) and the common oil return of the second inserted valve (50),
The oil-out (11) of described injection oil cylinder (10) is connected in parallel with the input A1 mouth of the first inserted valve (40) and the input B1 mouth of the second inserted valve (50) respectively; 2 mouthfuls of the output terminals A of the first inserted valve (40) and the output B2 mouth of the second inserted valve (50) are communicated with fuel tank (70) respectively.
2. the oil return control device of a kind of press-shoot oil cylinder of die casting according to claim 1, is characterized in that: described the first inserted valve (40) is (0.22 ~ 0.24) with the area of passage ratio of the second inserted valve (50): 1.
3. the oil return control device of a kind of press-shoot oil cylinder of die casting according to claim 2, is characterized in that: described the first inserted valve (40) is 0.23:1 with the area of passage ratio of the second inserted valve (50).
4. the oil return control device of a kind of press-shoot oil cylinder of die casting according to claim 1, is characterized in that: described the first inserted valve (40) is (0.42 ~ 0.44) with the opening pressure ratio of the second inserted valve (50): 1.
5. the oil return control device of a kind of press-shoot oil cylinder of die casting according to claim 4, is characterized in that: described the first inserted valve (40) is 0.43:1 with the opening pressure ratio of the second inserted valve (50).
6. the oil return control device of a kind of press-shoot oil cylinder of die casting according to claim 1, it is characterized in that: the switch of the switch of described the first inserted valve (40) and the second inserted valve (50) is all electrically connected with electromagnetic direction valve (60), and control by this electromagnetic direction valve (60).
7. the oil return control device of a kind of press-shoot oil cylinder of die casting according to claim 1, it is characterized in that: the throttle orifice (41) that oil circuit is 1.3mm by diameter of closing of described the first inserted valve (40) is controlled, and the throttle orifice (41) that the unlatching oil circuit of the first inserted valve (40) is 1.8mm by diameter is controlled.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420344699.9U CN203972817U (en) | 2014-06-26 | 2014-06-26 | A kind of oil return control device of press-shoot oil cylinder of die casting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420344699.9U CN203972817U (en) | 2014-06-26 | 2014-06-26 | A kind of oil return control device of press-shoot oil cylinder of die casting |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203972817U true CN203972817U (en) | 2014-12-03 |
Family
ID=51970303
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420344699.9U Expired - Fee Related CN203972817U (en) | 2014-06-26 | 2014-06-26 | A kind of oil return control device of press-shoot oil cylinder of die casting |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203972817U (en) |
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2014
- 2014-06-26 CN CN201420344699.9U patent/CN203972817U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141203 Termination date: 20210626 |
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| CF01 | Termination of patent right due to non-payment of annual fee |