WO1992022392A1 - Die cushion pin pressure equalizing system, method of calculating peak oil pressure in the system and method of calculating service life of pressure equalizing hydraulic cylinders - Google Patents
Die cushion pin pressure equalizing system, method of calculating peak oil pressure in the system and method of calculating service life of pressure equalizing hydraulic cylinders Download PDFInfo
- Publication number
- WO1992022392A1 WO1992022392A1 PCT/JP1992/000776 JP9200776W WO9222392A1 WO 1992022392 A1 WO1992022392 A1 WO 1992022392A1 JP 9200776 W JP9200776 W JP 9200776W WO 9222392 A1 WO9222392 A1 WO 9222392A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- pressure
- die cushion
- plunger
- hydraulic cylinder
- equalizing
- Prior art date
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
- B30B15/02—Dies; Inserts therefor; Mounting thereof; Moulds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D24/00—Special deep-drawing arrangements in, or in connection with, presses
- B21D24/02—Die-cushions
Definitions
- the present invention provides an improvement for preventing breakage and oil leakage of a pressure equalizing hydraulic cylinder of a die cushion pin pressure equalizing device used for drawing, and calculates a peak hydraulic pressure to be obtained in order to perform the preventive measures. For how to.
- a die cushion is provided below the lower die to prevent wrinkles from occurring during the drawing press.
- Fig. 6 shows a press machine equipped with a die
- 1 is a crown
- 2 is an ablate
- 3 is a bed
- 4 is a slide
- 5 is an upper mold
- 6 is a lower mold
- 7 is a lower mold.
- Bolster, 8 is a moving bolster
- 9 is a cushion pin
- 10 is a pressure equalizing device plate
- 11 is an equalizing hydraulic cylinder
- 12 is a die cushion pad
- 13 is a die cushion leg
- 14 is a die cushion leg.
- numeral 15 is a cushion rod
- numeral 16 is a damper filled with oil.
- a bolster 7 is installed on a bed 3 via a moving bolster 8, and a die cushion pad I 2 is accommodated in the bed 3.
- the die cushion pad 12 is supported by a die cushion cylinder 14 provided on a cushion leg 13.
- the compressed air source is connected to the suction cylinder 14 via a pressure adjusting unit (not shown).
- a lower die 6 is mounted on the bolster 7, and a plurality of die cushion pins 9 are provided in the bolster 7 so as to pass through a plurality of pin holes.
- the plurality of da I cushion pins 9 Ru Tsutere, such to support a Daipa' de (not shown) in the lower die 6 0
- a plurality of pressure equalizing hydraulic cylinders 11 are provided on the pressure equalizing device plate 10 corresponding to the positions of the plurality of cushion pins 9. As shown in Fig. 7, the plunger 18 comes into contact with the lower end of the cushion pin 9 and the flange 17 of the plunger 18 comes into contact with the cylinder oil chamber. Is housed in That is, the flange portion 17 of the plunger functions as a stopper above the cylinder 11.
- Each cylinder oil chamber of the equalizing hydraulic cylinder 11 is connected to a hydraulic source (not shown) via an oil passage 19 (a borehole, a pipe, etc. provided in the equalizing device plate 10). I have.
- a check valve is provided in the oil passage 19, and oil adjusted to a pressure sufficient to absorb the length ⁇ of each cushion pin is sealed in the oil passage 19 and each cylinder oil chamber. .
- the die cushion pin is selected according to the die, and then the press machine is driven.
- the force D pressure is applied to the die cushion pin 9 to be used, the hydraulic pressure supplied to each pressure equalizing hydraulic cylinder 11 is leaked, so the force D pressure is reduced to the cushion pin 9 and the hydraulic cylinder 1 By being transmitted to the die cushion pad 12 via 1, it is absorbed by the die cushion cylinder 14.
- the non-uniformity of the force 0 pressure due to the length error of each die cushion pin 9 and the error at the time of mounting is absorbed by the cushion pressure of the equalizing hydraulic cylinder 11 described above.
- the peak hydraulic pressure time is about 0.05. If the accumulator is not disposed in the vicinity of the pressure equalizing device because the time is short, there is a problem that a peak occurs before the pressure wave reaches the accumulator. However, it is impossible to dispose the accumulator in the immediate vicinity of the pressure equalizing device, considering the problem of interference with the mold.
- the present invention has been made in view of such circumstances, and has a die cushion pin pressure equalizing device capable of easily preventing fatigue of a flange portion of a plunger of an unused pressure equalizing hydraulic cylinder and fracture or oil leakage.
- the purpose is to provide.
- a plurality of die cushion pins are provided in a bolster of a press machine, and a pressure equalizing hydraulic cylinder supported by a die cushion is provided below each of the plurality of die cushion pins.
- a pressure equalizing hydraulic cylinder supported by a die cushion is provided below each of the plurality of die cushion pins.
- the total amount of oil sealed in the die cushion pin pressure equalizing device is increased.
- the shock force applied to the unused hydraulic cylinder is reduced;-the primary peak pressure is reduced, and
- the life of pressure equalizing hydraulic cylinder can be extended o
- the simple measure of increasing the total amount of oil in the pressure equalizing device can only be used to reduce the fatigue of the stopper of the plunger of the unused pressure equalizing hydraulic cylinder. Breakage and oil leaks can be reliably and easily prevented, thereby greatly extending the life of the plunger.
- a plurality of die cushion pins are provided in a bolster of a press machine, and a pressure equalizing hydraulic cylinder supported by a die cushion is provided below each of the plurality of die cushion pins.
- Die cushion pin for calculating the peak hydraulic pressure generated in the pressure equalizing hydraulic cylinder of the die cushion pin pressure equalizing device in which the pressure equalizing hydraulic cylinders are filled with a predetermined hydraulic pressure.
- the temporary primary peak pressure is calculated based on the diameter of the plunger of the hydraulic cylinder with a reduced pressure, the number of die cushion pins used, and the speed of the upper die when the upper die contacts the die cushion pins.
- FIG. 1 is a flowchart showing a procedure for calculating a peak hydraulic pressure according to the present invention
- FIG. 2 is a graph showing a hydraulic waveform generated in a die cushion pressure equalizing device
- FIG. 3 is a diagram for calculating a temporary primary peak hydraulic pressure.
- Graph Fig. 4 is a graph for correction by die cushion air pressure
- Fig. 5 is a graph for obtaining secondary peak oil pressure from primary peak oil pressure
- Fig. 6 is a die cushion pin pressure equalizing device.
- Fig. 7 shows a press machine equipped with a pressure equalizer
- Fig. 7 is an enlarged view of the hydraulic cylinder part of the pressure equalizing device
- Fig. 8 shows the fatigue of the plunger of the pressure equalizing hydraulic cylinder plunger.
- FIG. 1 is a flowchart showing a procedure for calculating a peak hydraulic pressure according to the present invention
- FIG. 2 is a graph showing a hydraulic waveform generated in a die cushion pressure equalizing device
- FIG. 3 is
- Fig. 2 shows the hydraulic pressure waveform of the die cushion pin pressure equalizing device shown in Figs. 6 and 7 above, where 0 is the preload hydraulic pressure, Pmaxl is the pin touch time (the upper die 5 is (When touching the cushion pin 9), the primary peak hydraulic pressure, Pmax2 is the secondary peak hydraulic pressure, and PD is the stable hydraulic pressure according to the capacity of the die cushion.
- Fig. 1 shows the procedure for calculating the primary peak hydraulic pressure Pmaxl and the secondary peak hydraulic pressure Pmax2 and the procedure for calculating the fatigue damage of the plunger: ⁇ life, as shown in Fig. 2 above. Explanation will be given according to the
- the calculation method jl the following five parameters are used as the calculation parameters.
- the diameter of the plunger 18? ! the number N of the die cushion pins 9 to be used and the pinching speed V are obtained, and based on these values, the temporary primary peak pressure Pa is calculated using the corresponding graph in FIG.
- the graph in Fig. 3 shows the number of die cushion pins used (N) on the horizontal axis, and changes the scale of the graph between this number N and 6 O mm when the plunger diameter is 5
- the right vertical axis plots the pin-touch speed V (m / sec)
- the left vertical axis plots the temporary primary peak pressure Pa (kg / cm2).
- the plotted point “-” indicates an actual measurement value at a certain factory
- the other plot point “ ⁇ ” indicates an actual measurement value at another factory. For example, if a plunger diameter?
- the graph shows that the temporary primary peak pressure Pa can be obtained when the total oil quantity Q of the oil enclosed in the pressure equalizer is 6.1 liters and the diction air pressure p is 6.2 kg / cm2.
- the correction calculation is performed according to the following procedure.
- the calculated primary peak pressure Pa is corrected by the total oil amount Q (liter) of the pressure equalizing device to obtain a calculated primary peak pressure: Pb.
- a calculated primary peak pressure Pb.
- One of the following two equations (1) and (2) is used as the correction equation used in this case.
- the number of die cushion pins used when the diameter of the plunger? 5 is 50 and the number of die cushion pins used is 40 or more when the plunger diameter? 5 is 60 mm.
- the value is 58: Lh, it is not necessary to perform this step 2, that is, the correction calculation based on the total oil amount Q.
- a plunger diameter of 50mm If the number of these used is 15 and the pinching speed V is 0.6 ra / sec, and the total oil amount Q of the pressure equalizer is 5. ⁇ liter,
- step 120 the calculated primary peak pressure Pb calculated in step 2 above is corrected using die cushion air pressure p, and the final Obtain the primary peak pressure Pmaxl.
- the secondary peak pressure P x2> may be the primary peak pressure Pmaxl. Use the value of the secondary peak pressure Pmax2 instead of the secondary peak pressure Pmaxl.
- Figure 5 shows the calculation of the secondary peak pressure Pmax2 from the primary peak pressure Pmaxl calculated in step 3.
- the graph shows the number of die cushion pins used (N) on the horizontal axis, and this number N is used when the plunger diameter? 5 is 5 Omm and 6 Omm.
- the scale is changed, and the right vertical axis plots the die cushion air pressure P (kg / cm 2 ), and the left vertical axis plots the ratio of the secondary peak pressure Pmax x2 to the primary peak pressure Praaxl. ing.
- the plotted point “-” indicates an actual measurement value at a certain factory.
- the fine spring with the number of pins for the officer and the line with the die cushion air pressure plotted (the six lines shown in Fig. 5 show the die cushion air pressure of 1.5 kg / cm 2 and 2 kg). / cm 2 , 3 kg / cm 2 , 4 kg / cm 2 , 5 kg / cm 2 , and 6 kg / cm 2 , and these six lines correspond to the die cushion air pressure at that time.
- the value at the position where the intersection point of is extended to the left is the ratio (Pmax2 / Pmaxl) of the secondary peak pressure Pmax2 to the primary peak pressure Proaxl at this time.
- the secondary peak pressure Pmax2 is calculated by multiplying the primary peak pressure Pmaxl calculated in the previous step 3 by this ratio, and the secondary peak pressure Pmax2 is calculated in the subsequent life calculation. Beak pressure Pniax2 should be used.
- the fatigue failure life L obtained by such a method was able to obtain a favorable agreement with the life of the actually destroyed plunger.
- the life L of the stopper portion of the plunger can be extended by lowering the primary peak pressure P maxl.
- the life of the pressure equalizing hydraulic cylinder is extended by using a simple method of increasing the total oil amount Q of the pressure equalizing device.
- the parameter of the total oil amount Q of the pressure equalizing device is a parameter that can be adjusted more easily than other parameters such as the number of used die cushion pins, die cushion air pressure, and pin touch speed. .
- the present invention is useful for a technique in which a die cushion pin equalizing device is attached to a press machine to perform a drawing force D.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
- Presses And Accessory Devices Thereof (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4291861T DE4291861T1 (en) | 1991-06-17 | 1992-06-17 | A method of reducing the peak oil pressure in a pressure compensation system for die cushion support pins, a method of calculating the peak oil pressure in the system, and a method of calculating the life of the pressure compensation cylinders |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3/144923 | 1991-06-17 | ||
JP3144923A JP3062665B2 (en) | 1991-06-17 | 1991-06-17 | Method of calculating oil amount of die cushion pin pressure equalizing device, method of calculating peak oil pressure of the device, and method of calculating hydraulic cylinder life of pressure equalizing device |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1992022392A1 true WO1992022392A1 (en) | 1992-12-23 |
Family
ID=15373368
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP1992/000776 WO1992022392A1 (en) | 1991-06-17 | 1992-06-17 | Die cushion pin pressure equalizing system, method of calculating peak oil pressure in the system and method of calculating service life of pressure equalizing hydraulic cylinders |
Country Status (3)
Country | Link |
---|---|
JP (1) | JP3062665B2 (en) |
DE (1) | DE4291861T1 (en) |
WO (1) | WO1992022392A1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10837472B2 (en) | 2018-02-22 | 2020-11-17 | Caterpillar Inc. | Hydraulic cylinder health monitoring and remaining life system |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS60108429U (en) * | 1983-12-27 | 1985-07-23 | トヨタ自動車株式会社 | Cushion pin pressure equalization device for press machines |
-
1991
- 1991-06-17 JP JP3144923A patent/JP3062665B2/en not_active Expired - Fee Related
-
1992
- 1992-06-17 WO PCT/JP1992/000776 patent/WO1992022392A1/en active Application Filing
- 1992-06-17 DE DE4291861T patent/DE4291861T1/en not_active Withdrawn
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS60108429U (en) * | 1983-12-27 | 1985-07-23 | トヨタ自動車株式会社 | Cushion pin pressure equalization device for press machines |
Also Published As
Publication number | Publication date |
---|---|
JPH04371324A (en) | 1992-12-24 |
DE4291861T1 (en) | 1994-05-05 |
JP3062665B2 (en) | 2000-07-12 |
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