CN110695134A - Offset load online measuring device and evaluation method for fine blanking progressive die - Google Patents
Offset load online measuring device and evaluation method for fine blanking progressive die Download PDFInfo
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- CN110695134A CN110695134A CN201911029046.5A CN201911029046A CN110695134A CN 110695134 A CN110695134 A CN 110695134A CN 201911029046 A CN201911029046 A CN 201911029046A CN 110695134 A CN110695134 A CN 110695134A
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- 230000000750 progressive effect Effects 0.000 title claims abstract description 37
- 238000011156 evaluation Methods 0.000 title claims abstract description 7
- 230000005484 gravity Effects 0.000 claims abstract description 45
- 230000001133 acceleration Effects 0.000 claims description 40
- 238000000034 method Methods 0.000 claims description 19
- 230000008569 process Effects 0.000 claims description 16
- 238000004080 punching Methods 0.000 claims description 16
- 238000007599 discharging Methods 0.000 claims description 9
- 238000004519 manufacturing process Methods 0.000 claims description 8
- 238000012544 monitoring process Methods 0.000 abstract description 2
- 238000005259 measurement Methods 0.000 description 5
- 238000003825 pressing Methods 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C51/00—Measuring, gauging, indicating, counting, or marking devices specially adapted for use in the production or manipulation of material in accordance with subclasses B21B - B21F
Abstract
The invention relates to an offset load online measuring device and an evaluation method for a fine blanking progressive die, which solve the technical problem that the existing offset load detecting device of the fine blanking progressive die cannot carry out real-time monitoring and comprise a feed end gravity sensor, a discharge end gravity sensor, a data acquisition card and a computer, wherein the output end of the feed end gravity sensor is connected with the data acquisition card through a signal line, the output end of the discharge end gravity sensor is connected with the data acquisition card through a signal line, and the data acquisition card is connected with the computer; the feed-end gravity sensor is configured to be connected to a left side of a nip plate of the fine blanking progressive die, and the discharge-end gravity sensor is configured to be connected to a right side of the nip plate of the fine blanking progressive die. The invention is widely applied to the technical field of plastic forming dies.
Description
Technical Field
The invention relates to a measurement technology oriented to the field of plastic forming dies, in particular to an offset load online measurement device and an evaluation method oriented to a fine blanking progressive die.
Background
With the continuous popularization of the fine blanking technology, the fine blanking progressive die is more and more widely applied to the manufacturing of precision parts. Compared with the traditional progressive stamping die, the fine progressive stamping die is under the combined action of blanking force, blank pressing force and anti-jacking force in the working process. In addition, the clearance of the punch and die and the matching precision of each die part are more severe than those of the traditional progressive stamping die. In the forming process, the uneven clearance between the male die and the female die can be caused by the unbalance loading condition, and the forming quality of parts is influenced. In severe cases, the male and female dies are collided or the male die is broken, thereby affecting the service life of the die. Aiming at the unbalance loading problem of the multi-station fine blanking progressive die, although the large unbalance loading can be avoided as far as possible by using a method of accurately calculating a die pressure center and optimizing step layout of each station, the performance fluctuation of materials and the change of service environment can cause the instability of a forming process and the uncertainty of the unbalance loading degree.
The invention application with the patent application number of 201811068443.9 discloses an offset load detection method of a multi-station press, which is characterized in that the calculated total stamping force and total eccentric position of a die are compared with an offset load capacity curve of the multi-station press input in advance to detect the offset load condition of the press so as to avoid damage of a slide block guide path and potential safety hazards. The invention patent with the patent number 201710693878.1 discloses an instant unbalance loading balancing device, which realizes unbalance loading response by adding a driving cylinder body corresponding to a station, so that a stress center and a pressure center of a multi-station fine blanking die coincide, and the problems of damaged unbalance loading of the die and poor part processing quality are avoided. The invention patent with the patent number 201510409723.1 discloses an offset load active balance fine blanking die structure, which separates a pressure plate according to the number of stations and controls the pressure plate by an independent hydraulic cylinder, so as to actively balance the offset load in the fine blanking process.
In summary, the technical scheme mainly uses an independent oil cylinder or a driving oil cylinder special for a station to actively seek balance, or directly judges whether the unbalance loading potential safety hazard exists or not from the layer of the press machine, and the unbalance loading is not monitored from the real-time production angle. From the production practice of factories, the unbalance loading condition in the production process is changed constantly, and the service life of the die is seriously influenced. Therefore, it is necessary to monitor and evaluate the unbalance loading condition of the fine blanking progressive die in real time, so as to provide reference for die design and subsequent unbalance loading balancing measures.
Disclosure of Invention
The invention aims to solve the technical problem that the existing unbalance loading detection device of the fine blanking progressive die cannot carry out real-time monitoring, and provides an unbalance loading on-line measurement device and an evaluation method for the fine blanking progressive die, which are used for carrying out real-time measurement on the unbalance loading of the fine blanking progressive die.
The invention has the basic principle that the gravity sensors arranged at the feeding end and the discharging end of a material pressing plate of a fine blanking progressive die are used for measuring acceleration change curves at two sides of the feeding end and the discharging end of the die; then, the measured acceleration signal is transmitted to a computer by using a data acquisition card, and the difference of signals at the two sides of the feeding end and the discharging end of the fine blanking progressive die can be judged by combining signal processing; when the signal deviation value exceeds the set threshold value, the unbalance loading is too serious. At this time, the production should be stopped as soon as possible, and the balance of the mold should be adjusted.
The invention provides an offset load online measuring device facing a fine blanking progressive die, which comprises a feed end gravity sensor, a discharge end gravity sensor, a data acquisition card and a computer, wherein the output end of the feed end gravity sensor is connected with the data acquisition card through a signal wire; the feed-end gravity sensor is configured to be connected to a left side of a nip plate of the fine blanking progressive die, and the discharge-end gravity sensor is configured to be connected to a right side of the nip plate of the fine blanking progressive die.
The invention also provides an offset load evaluation method of the offset load on-line measuring device for the fine blanking progressive die, which comprises the following steps:
step 1, critical deviation value delta set by computerc；
Step 2, in the working process of the fine blanking progressive die, a gravity sensor at the feeding end feeds back an acceleration signal to a computer, and a gravity sensor at the discharging end feeds back an acceleration signal to the computer;
step 4, calculating a deviation value delta b by the computer1-a1，a1Acceleration value, b, of curve ①1An acceleration value representing curve ②;
step 5, the computer compares the deviation value delta with the critical deviation value deltacMaking a comparison when>ΔcWhen the unbalance loading is too large, the load is increasedStopping production in time and carrying out balance adjustment on the die.
Preferably, in step 1, ΔcThe specific determination process is as follows:
(1) placing a strip material at the punching step, keeping the blanking step in an empty station state, and closing the die to finish the fine blanking forming process; acquiring acceleration signal curves of a feed end gravity sensor and a discharge end gravity sensor by using a data acquisition card, calculating an acceleration deviation value at any moment based on curve interpolation, and recording a maximum acceleration deviation value delta1；
(2) Placing a strip material at the blanking step, keeping the punching step in an idle station state, and closing the die to finish the fine blanking forming process; acquiring acceleration signal curves of gravity sensors on two sides of the pressure plate by using a data acquisition card, calculating an acceleration deviation value at any moment based on curve interpolation, and recording a maximum acceleration deviation value delta2；
(3) Calculating to obtain a critical deviation value deltac＝|Δ1-Δ2|。
The invention has the advantages that the offset load real-time measurement of the fine blanking progressive die can be realized, and the reference is effectively and accurately provided for the die design and the subsequent offset load balancing measures. And dynamically judging the acceleration signal deviation values of gravity sensors arranged at the feeding end and the discharging end, judging the severity of the unbalanced load state of the die according to the signal deviation, and determining whether to increase a balance block to improve the unbalanced load degree of the die.
Further features of the invention will be apparent from the description of the embodiments which follows.
Drawings
FIG. 1 is a schematic view of a fine blanking progressive die including two process steps of punching and blanking;
FIG. 2 is a schematic view of the structure and installation of the offset load on-line measuring device;
in fig. 3, the acceleration curves of the gravity sensors installed at the feed end and the discharge end under the ideal condition are shown in (a), and the acceleration curves of the gravity sensors under the offset loading condition of the die are shown in (b).
The symbols in the drawings illustrate that:
1. the punching die comprises an upper die base, 2. a guide post, 3. a pressure plate fixing plate, 4. a female die, 5. a guide sleeve, 6. a lower die base, 7. a force transmission rod, 8. the force transmission rod, 9. an ejector, 10. a female die backing plate, 11. an ejector, 12. a bar stock, 13. a pressure plate, 14. a punching male die, 15. a blank holder force transmission rod, 16. a male die backing plate, 17. an inner hole positioning male die, 18. a blanking male die and 19. a male die fixing plate. 20. The direction of an arrow in the figure 2 is the moving direction of the strip materials.
Detailed Description
The present invention will be described in further detail below with reference to specific embodiments thereof with reference to the attached drawings.
As shown in fig. 1, the fine blanking progressive die including two punching and blanking steps includes an upper die holder 1, a guide pillar 2, a pressure plate fixing plate 3, a female die 4, a guide sleeve 5, a lower die holder 6, a dowel bar 7, a dowel bar 8, an anti-ejector 9, a female die cushion plate 10, an anti-ejector 11, a pressure plate 13, a punching male die 14, a blank holder dowel bar 15, a male die cushion plate 16, an inner hole positioning male die 17, a blanking male die 18 and a male die fixing plate 19. The left side of figure 1 is the strip feed end and the right side is the discharge end. The fine blanking progressive die comprises two working steps of punching and blanking, wherein different processing steps are completed by sequentially associating each working position of the fine blanking progressive die, and a series of forming operations of each working position are completed in one stroke of a fine blanking press.
As shown in fig. 2, the online unbalance load measuring device facing the fine blanking progressive die comprises a feed end gravity sensor 20, a discharge end gravity sensor 21, a data acquisition card 22, a signal line 23, a signal line 24 and a computer 25, wherein the feed end gravity sensor 20 is fixedly installed on the left side of the pressure plate 13, the discharge end gravity sensor 21 is fixedly installed on the right side of the pressure plate 13, the output end of the feed end gravity sensor 20 is connected with the data acquisition card 22 through the signal line 23, the output end of the discharge end gravity sensor 21 is connected with the data acquisition card 22 through the signal line 24, and the data acquisition card 22 is connected with the computer 25. In the working process of the pressure plate 13, acceleration signals of the feeding end gravity sensor 20 and the discharging end gravity sensor 21 changing along with time are read by the data acquisition card 22, the signals are transmitted to the computer 25, and two acceleration signal curves can be generated by signal processing software in a coordinate axis taking the acceleration as a vertical coordinate and the time as an abscissa coordinate.
After the fine blanking progressive die is closed, the strip at the first station forms a punching operation under the combined action of the punching male die 14, the pressure plate 13, the female die 4 and the ejection reverser 9, at this time, the pressure plate 13 moves upwards, and at the same time, the strip at the second station forms a blanking operation under the combined action of the blanking male die 18, the inner hole positioning male die 17, the pressure plate 13, the female die 4 and the ejection reverser 11, similarly, the pressure plate 13 moves upwards, under an ideal non-offset loading condition, acceleration signal curves ① and ② given by the feeding end gravity sensors 20 and the discharging end gravity sensors 21 arranged on two sides of the pressure plate 13 are completely overlapped, as shown in (a) in fig. 3.
For the fine blanking progressive die, the upward moving acceleration of the two sides of the material pressing plate 13 is different due to the acting force required for punching and blanking, and the acceleration signal curve of the gravity sensors at the two sides of the material pressing plate acquired by computer display is shown as (b) in fig. 3, wherein the curve ① corresponds to the acceleration signal curve of the gravity sensor 20 at the feeding end and the curve ② corresponds to the acceleration signal curve of the gravity sensor 21 at the discharging end0At the beginning of the time, the two curves begin to diverge. Let t1The time is the current time, and the acceleration value corresponding to the curve ① at the time is a1Acceleration value of curve ② is b1Then the computer calculates t1Deviation value of time Δ b1-a1Will t1Deviation value delta of time and critical deviation value delta initially set by computercMaking a comparison when>ΔcAnd judging that the unbalance loading is serious, reminding the operator to stop production in time, and improving the unbalance loading condition of the die by adding the balance block.
Critical deviation value delta set for computercThe determination needs to be made according to the condition of the die, and specific determination processes for the punching and blanking progressive die shown in fig. 1 are as follows:
step 1, placing a strip material at a punching step, and placing a blanking step at an idle stationIn the state, the die is closed to finish the fine blanking forming process; acquiring acceleration signal curves of gravity sensors on two sides of the pressure plate by using a data acquisition card, calculating an acceleration deviation value at any moment based on curve interpolation, and recording a maximum acceleration deviation value delta1；
Step 2, placing the strip material at the blanking step, keeping the punching step in an idle station state, and closing the die to finish the fine blanking forming process; acquiring acceleration signal curves of gravity sensors on two sides of the pressure plate by using a data acquisition card, calculating an acceleration deviation value at any moment based on curve interpolation, and recording a maximum acceleration deviation value delta2；
The present invention and its embodiments have been described above schematically, without limitation, and what is shown in the drawings is only one of the embodiments of the present invention, and the actual structure is not limited thereto. Therefore, if the person skilled in the art should be informed by the teachings of the present invention, other configurations of the components, the driving device and the connection means, which are similar to the technical solution and are not designed creatively, shall fall within the protection scope of the present invention without departing from the inventive spirit of the present invention.
Claims (3)
1. The online unbalance load measuring device for the fine blanking progressive die is characterized by comprising a feed end gravity sensor, a discharge end gravity sensor, a data acquisition card and a computer, wherein the output end of the feed end gravity sensor is connected with the data acquisition card through a signal wire; the feed-end gravity sensor is configured to be connected to the left side of a pressure plate of the fine blanking progressive die, and the discharge-end gravity sensor is configured to be connected to the right side of the pressure plate of the fine blanking progressive die.
2. An offset load evaluation method applying the offset load on-line measuring device facing the fine blanking progressive die as recited in claim 1, comprising the steps of:
step 1, critical deviation value delta set by computerc；
Step 2, in the working process of the fine blanking progressive die, a gravity sensor at the feeding end feeds back an acceleration signal to a computer, and a gravity sensor at the discharging end feeds back an acceleration signal to the computer;
step 3, the computer generates a curve ① and a curve ② according to the received acceleration signals;
step 4, calculating a deviation value delta b by the computer1-a1，a1Acceleration value, b, of curve ①1An acceleration value representing curve ②;
step 5, the computer compares the deviation value delta with the critical deviation value deltacMaking a comparison when>ΔcAnd judging that the unbalance loading is too large, reminding to stop production in time and carrying out balance adjustment on the die.
3. The unbalance loading assessment method according to claim 2, characterized in that:
in said step 1,. DELTA.cThe specific determination process is as follows:
(1) placing a strip material at the punching step, keeping the blanking step in an empty station state, and closing the die to finish the fine blanking forming process; acquiring acceleration signal curves of a feed end gravity sensor and a discharge end gravity sensor by using a data acquisition card, calculating an acceleration deviation value at any moment based on curve interpolation, and recording a maximum acceleration deviation value delta1；
(2) Placing a strip material at the blanking step, keeping the punching step in an idle station state, and closing the die to finish the fine blanking forming process; acquiring acceleration signal curves of gravity sensors on two sides of the pressure plate by using a data acquisition card, calculating an acceleration deviation value at any moment based on curve interpolation, and recording a maximum acceleration deviation value delta2；
(3) Calculating to obtain a critical deviation value deltac＝|Δ1-Δ2|。
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| CN201911029046.5A CN110695134B (en) | 2019-10-28 | 2019-10-28 | Unbalanced load assessment method using unbalanced load online measurement device oriented to fine blanking progressive die |
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