Select Apply nitrogen gas spring in the mold design?
Publish: 2016-07-29 Views: 20411
1, nitrogen spring biasing force selection
Die with the design during the application of nitrogen gas spring technology, the first problem encountered is the biasing force of choice, the choice of what type of nitrogen spring, nitrogen springs choose how much force to meet the requirements of stamping process, to solve this problem often we need to consider three issues:
(1) nitrogen gas spring biasing force size.
(2) the number of nitrogen spring.
? (3) nitrogen gas springs pressure ratio. ?
2, nitrogen spring trip to choose?
Nitrogen spring stroke stamping process should meet the requirements of different stamping process, travel size requirements are not the same. Blanking separation step requires biasing force large and small travel; drawing process generally require relatively large stroke as nitrogen spring BHF function, requiring gas spring characteristic curve is relatively flat, in the drawing process, the basic BHF little change, that is, the biasing force remains substantially constant; for ejection, unloading, it is required to have sufficient strength and travel; in bending and flanging process usually requires a large initial force in order to suppress workpiece to prevent workpiece slip or move during the bending process, generally also require relatively large stroke. In either case, the total height of the gas spring is not too high, to avoid the phenomenon of instability, to avoid nitrogen gas spring is mounted on the mold structure is too complex, increasing the cost of tooling, if nitrogen gas spring is mounted in the upper mold, whether it is a top board member or blank holder must be a gap, nitrogen gas springs to ensure smooth work; sometimes for safety reasons, while avoiding accidents in the design selection was also taken to increase the nitrogen spring 3-5 mm safe trip, thus ensuring long-term nitrogen to work properly.
3, nitrogen gas springs structure of choice?
When using nitrogen gas spring in the mold design, we first need to determine the form of the structure of nitrogen gas springs. There are several forms can choose from: Detached nitrogen spring, nitrogen spring seat plate, pipe connection type and so on. These basic structure has its own characteristics and a certain range of applications, the need to parts stamping process requirements, in the form of mold structure, use of equipment, working environment, working conditions, mold cost and easy maintenance, adjustment and other factors, considering select.
4, cold stamping die design, selection of nitrogen gas springs should consider a few questions?
Nitrogen gas spring technology has its own characteristics and use of certain properly to the constraints of the application of this technology in order to fully play its role to obtain the desired results.
(1) nitrogen gas spring characteristic curve selection?
For a variety of stamping process, have different technical requirements, the choice of using nitrogen gas spring technology, to adapt its technology needs. For example, in the entire working stroke requires biasing force remains substantially constant, it should be said only for drawing bead effect, with respect to other techniques, it does not necessarily require a biasing force substantially constant, constant pressure bomb or not, influence not very big. But from an economic point of view, there is a relatively large impact, because each factory price of nitrogen spring, is related to its performance, the same biasing force, the use of force than the force of the spring constant of the nitrogen is not constant expensive, the same specifications nitrogen spring travel longer expensive. Currently nitrogen gas spring technology into the market not long history, the use of nitrogen gas spring once the cost of inputs relative to other elastic element must be high, if you do not take full account of its economy, blindly choose high-performance gas spring will affect the increase of the cost of the mold, and also very necessary. Thus, according to different process requirements, select a different nitrogen spring characteristic curve, to obtain the best price and the best value for money properties.
(2) elastic pressure balance
? Shot in the mold design pressure should maintain a balance transfer, select the application of nitrogen spring is often more than one, then arranged around the focal point of all need to solve a balance problem, from the stamping process point of view, but also need to consider the pressing force balance problems , to improve the life of the mold in order to facilitate and ensure the quality of stamped parts. From that use nitrogen spring, nitrogen spring is brought into contact with parts directly, through the design of the top member board, the top member block, clamping ring, cam, such as mold parts to mold the elastic pressure transmission parts work, then top boards such as mold working parts of the movement balance or not, with the arrangements of the relevant system of forces; on the other hand the top boards also play a role in transmitting the power to the gas spring, so in order to avoid nitrogen spring bear partial load, improving nitrogen gas springs the life and improve the life of the mold, the method should be used to design pressure nitrogen gas spring center punch lines coincide at the center of pressure.
(3) Stability
? No matter when or nitrogen gas springs work in the installation, require considerable stability and reliability because of its biasing force is quite large, a nitrogen gas spring in small volume, the release of several hundred kilograms to several tons even power, and this process is repeated constantly, therefore, maintain its stability work is quite important. When you install the fastening, especially with the power of a larger gas spring must be to ensure strong, especially inverted or nitrogen gas spring is mounted on the mold, with the nitrogen gas springs require constant movement of the slider relative movement only secure connection in order to ensure the normal spring nitrogen, stable job. So often the design and installation of nitrogen spring when the plunger or cylinder or open a certain depth of the sink hole installation, to ensure that its anteroposterior avoid skew.
(4) to avoid the impact
? It should be said that the nature of nitrogen spring belongs to the flexible category in the mold work, opening and closing should be relatively smooth, should not appear impact of the phenomenon, in order to achieve this, for the use of stand-alone gas spring designers to fully Taking this into account. As mentioned above, nitrogen gas springs frequency response is very high, parts upon contact nitrogen spring biasing force of the plunger rod can produce, does not have a face tightening process, then with the press slider, under sports, nitrogen spring open (expanded) and closed (compress) the response is very fast, if not properly designed, particularly the use of nitrogen gas spring in the small-tonnage presses, there may occur a nitrogen gas springs push the slider return phenomenon, undermining the crank press slide motion curve, resulting in shock impact phenomenon. Therefore, we should try to avoid this phenomenon.
Die with the design during the application of nitrogen gas spring technology, the first problem encountered is the biasing force of choice, the choice of what type of nitrogen spring, nitrogen springs choose how much force to meet the requirements of stamping process, to solve this problem often we need to consider three issues:
(1) nitrogen gas spring biasing force size.
(2) the number of nitrogen spring.
? (3) nitrogen gas springs pressure ratio. ?
2, nitrogen spring trip to choose?
Nitrogen spring stroke stamping process should meet the requirements of different stamping process, travel size requirements are not the same. Blanking separation step requires biasing force large and small travel; drawing process generally require relatively large stroke as nitrogen spring BHF function, requiring gas spring characteristic curve is relatively flat, in the drawing process, the basic BHF little change, that is, the biasing force remains substantially constant; for ejection, unloading, it is required to have sufficient strength and travel; in bending and flanging process usually requires a large initial force in order to suppress workpiece to prevent workpiece slip or move during the bending process, generally also require relatively large stroke. In either case, the total height of the gas spring is not too high, to avoid the phenomenon of instability, to avoid nitrogen gas spring is mounted on the mold structure is too complex, increasing the cost of tooling, if nitrogen gas spring is mounted in the upper mold, whether it is a top board member or blank holder must be a gap, nitrogen gas springs to ensure smooth work; sometimes for safety reasons, while avoiding accidents in the design selection was also taken to increase the nitrogen spring 3-5 mm safe trip, thus ensuring long-term nitrogen to work properly.
3, nitrogen gas springs structure of choice?
When using nitrogen gas spring in the mold design, we first need to determine the form of the structure of nitrogen gas springs. There are several forms can choose from: Detached nitrogen spring, nitrogen spring seat plate, pipe connection type and so on. These basic structure has its own characteristics and a certain range of applications, the need to parts stamping process requirements, in the form of mold structure, use of equipment, working environment, working conditions, mold cost and easy maintenance, adjustment and other factors, considering select.
4, cold stamping die design, selection of nitrogen gas springs should consider a few questions?
Nitrogen gas spring technology has its own characteristics and use of certain properly to the constraints of the application of this technology in order to fully play its role to obtain the desired results.
(1) nitrogen gas spring characteristic curve selection?
For a variety of stamping process, have different technical requirements, the choice of using nitrogen gas spring technology, to adapt its technology needs. For example, in the entire working stroke requires biasing force remains substantially constant, it should be said only for drawing bead effect, with respect to other techniques, it does not necessarily require a biasing force substantially constant, constant pressure bomb or not, influence not very big. But from an economic point of view, there is a relatively large impact, because each factory price of nitrogen spring, is related to its performance, the same biasing force, the use of force than the force of the spring constant of the nitrogen is not constant expensive, the same specifications nitrogen spring travel longer expensive. Currently nitrogen gas spring technology into the market not long history, the use of nitrogen gas spring once the cost of inputs relative to other elastic element must be high, if you do not take full account of its economy, blindly choose high-performance gas spring will affect the increase of the cost of the mold, and also very necessary. Thus, according to different process requirements, select a different nitrogen spring characteristic curve, to obtain the best price and the best value for money properties.
(2) elastic pressure balance
? Shot in the mold design pressure should maintain a balance transfer, select the application of nitrogen spring is often more than one, then arranged around the focal point of all need to solve a balance problem, from the stamping process point of view, but also need to consider the pressing force balance problems , to improve the life of the mold in order to facilitate and ensure the quality of stamped parts. From that use nitrogen spring, nitrogen spring is brought into contact with parts directly, through the design of the top member board, the top member block, clamping ring, cam, such as mold parts to mold the elastic pressure transmission parts work, then top boards such as mold working parts of the movement balance or not, with the arrangements of the relevant system of forces; on the other hand the top boards also play a role in transmitting the power to the gas spring, so in order to avoid nitrogen spring bear partial load, improving nitrogen gas springs the life and improve the life of the mold, the method should be used to design pressure nitrogen gas spring center punch lines coincide at the center of pressure.
(3) Stability
? No matter when or nitrogen gas springs work in the installation, require considerable stability and reliability because of its biasing force is quite large, a nitrogen gas spring in small volume, the release of several hundred kilograms to several tons even power, and this process is repeated constantly, therefore, maintain its stability work is quite important. When you install the fastening, especially with the power of a larger gas spring must be to ensure strong, especially inverted or nitrogen gas spring is mounted on the mold, with the nitrogen gas springs require constant movement of the slider relative movement only secure connection in order to ensure the normal spring nitrogen, stable job. So often the design and installation of nitrogen spring when the plunger or cylinder or open a certain depth of the sink hole installation, to ensure that its anteroposterior avoid skew.
(4) to avoid the impact
? It should be said that the nature of nitrogen spring belongs to the flexible category in the mold work, opening and closing should be relatively smooth, should not appear impact of the phenomenon, in order to achieve this, for the use of stand-alone gas spring designers to fully Taking this into account. As mentioned above, nitrogen gas springs frequency response is very high, parts upon contact nitrogen spring biasing force of the plunger rod can produce, does not have a face tightening process, then with the press slider, under sports, nitrogen spring open (expanded) and closed (compress) the response is very fast, if not properly designed, particularly the use of nitrogen gas spring in the small-tonnage presses, there may occur a nitrogen gas springs push the slider return phenomenon, undermining the crank press slide motion curve, resulting in shock impact phenomenon. Therefore, we should try to avoid this phenomenon.
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