EP0671226A1 - Regler und Regelungsverfahren für Aluminium-Strangpresse - Google Patents

Regler und Regelungsverfahren für Aluminium-Strangpresse Download PDF

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Publication number
EP0671226A1
EP0671226A1 EP95102833A EP95102833A EP0671226A1 EP 0671226 A1 EP0671226 A1 EP 0671226A1 EP 95102833 A EP95102833 A EP 95102833A EP 95102833 A EP95102833 A EP 95102833A EP 0671226 A1 EP0671226 A1 EP 0671226A1
Authority
EP
European Patent Office
Prior art keywords
aluminum shape
control
shape extruder
speed
hydraulic unit
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.)
Granted
Application number
EP95102833A
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English (en)
French (fr)
Other versions
EP0671226B1 (de
Inventor
Hitoshi Mukaiyama
Takeshi Okubo
Seizo Washizuka
Yasuo Nakano
Norihito Shiokai
Norio Futakuchi
Satoshi Hisaminato
Shinichi C/O C.I.S. Co. Ltd Sakai
Keiichi C/O C.I.S. Co. Ltd Yoshio
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
TOYAMA KEIKINZOKU KOGYO CO Ltd
Original Assignee
TOYAMA KEIKINZOKU KOGYO CO Ltd
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Publication date
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Publication of EP0671226A1 publication Critical patent/EP0671226A1/de
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Publication of EP0671226B1 publication Critical patent/EP0671226B1/de
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Classifications

    • 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
    • B21C31/00—Control devices, e.g. for regulating the pressing speed or temperature of metal; Measuring devices, e.g. for temperature of metal, combined with or specially adapted for use in connection with extrusion presses

Definitions

  • This invention relates to control of an aluminum shape extruder, more particularly to an aluminum shape extruder controller equipped with a laser speed sensor for enabling very fine computer predictive control matched to individual products.
  • Prior art aluminum extruders are controlled using signals from measuring instruments associated with the plant equipment. In this method, problems arise owing to the limited accuracy etc. of the measuring instruments.
  • the fact chat most aluminum extruders are controlled by a sequencer or a PID controller also leads to problems, because, even in extruders equipped with a dedicated controller, the control method uses simple integrated values and the control is conducted in a fixed manner using specific parameters. As a result, it is difficult to change the control values from product to product and, therefore, difficult to achieve fine control. Owing to problems related to equipment noise and limited measurement accuracy, moreover, the prior art aluminum extruders require built-in filtering capability.
  • An object of this invention is to provide a controller and a control method for an aluminum shape extruder, which enable a computer to finely control the speed of the aluminum extruder according to the type of product being produced based on a detection signal from a laser speed sensor for detecting the speed of the aluminum shape extruder.
  • this invention provides a controller for an aluminum shape extruder comprising a laser speed sensor for detecting the operating speed of a hydraulic unit of the aluminum shape extruder and a computer control unit for controlling the operating speed of the hydraulic unit based on a comparison of the speed value represented by a detection signal of the laser speed sensor end a set speed value.
  • the invention further provides a control method for an aluminum shape extruder comprising the steps of using a laser speed sensor to detect the operating speed of a hydraulic unit of the aluminum shape extruder (extrusion tendency and product extrusion time during a product extrusion preparatory operation), storing the operating speed detected by the laser speed sensor in a computer memory, comparing the detected operating speed with a set value based on steady torque to obtain a comparison value, and conducting predictive control of the speed of the hydraulic unit taking hydraulic lag into account by steplessly calculating a control gain based on the comparison value obtained and automatically switching between feedback control and feedforward control.
  • the operating speed of the hydraulic unit of the aluminum shape extruder is detected by a laser speed, the detection result is compared with a set value, and the operating speed of the hydraulic unit of the aluminum shape extruder is controlled based on the result of the comparison.
  • the control method for an aluminum shape extruder involves detecting the operating speed (extrusion tendency and product extrusion time during product extrusion preparatory operation), storing the detected operating speed in a computer memory, and conducting predictive control of the speed of the hydraulic unit taking hydraulic lag into account by comparing the detected operating speed with a set value based on steady torque to thereby calculate a control signal and steplessly calculating a control gain based on the comparison value obtained and automatically switching between feedback control and feedforward control.
  • the dead time is detected and the ram speed behavior during burp operation (air bleeding operation at the time pressure is applied to an aluminum billet after it is loaded in the extruder) is analyzed for judging the startup tendency and enabling predictive control.
  • Figure 1 is a block diagram of an aluminum shape extruder which is an embodiment of this invention.
  • Figure 2(a) is a graph showing the relationship between torque and ram speed in ordinary PID control
  • Figure 2(b) is a graph showing the relationship between torque and ram speed in a ram control system according to the invention.
  • Figure 3 is a graph showing the relationship between torque and ram speed in predictive control based on steady torque.
  • Figure 4 shows graphs for judging startup tendency from ram behavior during burp operation, wherein Figure 4(a) is a graph showing slow startup tendency, Figure 4(b) is a graph showing fast startup tendency, and Figure 4(c) is a graph showing the relationship between pressure rise and the time between extrusion start and the instant of actual product emergence (dead time).
  • Figure 5 is a block diagram showing the discrimination logic.
  • FIG. 1 is a block diagram showing an aluminum shape extruder controller according to the invention.
  • the aluminum shape extruder controller designated by reference numeral 1, comprises a laser speed sensor 10, a sensor amplifier unit 20, a pulse unit 30, an F/V (frequency to voltage) converter 40 and a computer 50.
  • the laser speed sensor 10 detects the operating speed of a hydraulic unit of the aluminum shape extruder by use of a laser beam. More specifically, the sensor head of the laser speed sensor 10, which consists of a laser beam generator and a laser beam receiver for receiving reflected laser light, is mounted on the crosshead section of the hydraulic unit for projecting a laser beam onto the guide section thereof. In addition to detecting the operating speed of the hydraulic unit of the aluminum shape extruder, the laser speed sensor 10 also detects the extrusion tendency during the product extrusion preparatory operation and the dead time, as well as the product extrusion time.
  • the laser speed sensor 10 Since the laser speed sensor 10 is installed as an independent piece of equipment, it is little affected by extrusion equipment noise and since the data gathered at high speed by the laser speed sensor 10 is sent to the computer, the control can be conducted in real time, without need from the viewpoint of control for the data to be passed through a filter.
  • the sensor amplifier unit 20 receives the electric signal representing the result of the sensor head detection and amplifies it for transfer.
  • the laser speed sensor 10 monitors the motion (ram speed) of the aluminum shape extruder hydraulic unit.
  • the electric signal produced by the laser speed sensor 10 as the detection result and amplified by the sensor amplifier unit 20 is sent to the pulse unit 30, which converts it into a digital pulse signal. This is for preventing the signal from being attenuated and degraded by noise during transfer and thus ensuring stable high-speed transfer of the electric signal.
  • the electric signal representing the measurement result is converted to an analog signal by the F/V converter 40 and the converted signal is sent to the computer 50 where its tendency is evaluated.
  • the computer 50 includes a memory for storing the operating speed of the aluminum shape extruder hydraulic unit detected by the laser speed sensor 10 and a main computer unit for comparing the detected value with a set value and computing a control value.
  • the computer 50 is supplied with data indicating (a) pressure applied by hydraulic unit, (b) product speed, (c) set speed, (d) extrusion start, (e) extrusion end, (f) burp (air bleeding operation at the time pressure is applied to an aluminum billet after it is loaded in the extruder), and (g) ram speed.
  • the ram speed measured by the laser speed sensor 10, namely the movement of the aluminum shape extruder hydraulic unit during extrusion preparatory operation, is supplied to the computer, which calculates the ram speed behavior and gradient for judging the product extrusion tendency.
  • the hydraulic unit After the hydraulic unit starts to apply pressure to the aluminum billet, there is a certain amount of dead time before the product begins to emerge from the dies.
  • the length of this dead time and the gradient of the ram speed (movement of the aluminum shape extruder hydraulic unit during extrusion preparatory operation) are measured and an automatic calculation is conducted for selecting the control method (feedback or feedforward control) for the product concerned.
  • the control signal during startup is calculated and output based on a steady torque value calculated from the set speed ascertained beforehand, the control is not affected by error such as that in control based on an integrated value.
  • Figure 2(a) shows the experimentally determined relationship between torque and ram speed in ordinary PID (proportional integral and derivative) control.
  • PID proportional integral and derivative
  • the steady torque is calculated from the measured set speed (ram speed) end torque output control is conducted based on the calculated value. Since predictive control can therefore be conducted with the hydraulic lag taken into account, it is possible to achieve stable control which eliminates erratic ups and downs during startup.
  • control using steady torque calculation is conducted by calculating the torque output from the measured ram gradient and arrival time values, thus enabling predictive control taking the hydraulic delay into account. Since, as shown in Figure 3, the torque effect starting point A and the steady torque point B are decisively calculated as control information, control based on a torque curve that takes the hydraulic delay into account can be achieved.
  • Figure 4 shows how the startup tendency is discriminated from the characteristics of the ram behavior during burp operation, with Figure 4(a) illustrating a slow startup tendency and Figure 4(b) illustrating a fast start up tendency. The tendency is judged from the difference between ⁇ and ⁇ .
  • Figure 4(c) shows the time between extrusion start and the instant at which the product actually appears (dead time) and the pressure rise tendency during the dead time.
  • Figure 5 shows the discrimination logic. Based on the ram behavior during burp operation, a discrimination is made as whether the startup is slow or fast. If it is fast, the startup is subjected to special (feedback) control. If it is slow, an additional discrimination based on the dead time up to the emergence of the product and the pressure rise condition is made to determine whether the startup is fast or slow. If it is fast, feedback control is conducted. If it is slow (normal), maximum torque output control is further implemented for increasing the ram speed to a fixed value.
  • the detected ram speed and the set value are compared to calculate a control signal and computer control is conducted by using the value obtained by the comparison for switching between automatic feedback control and feedforward control of the operating speed of the hydraulic unit by a steplessly calculated control gain.
  • control can respond to complex movements of the extruder.
  • controller is constituted as a combination of a high-performance sensor and a computer.
  • the length of the period up to the start of product extrusion (the dead time) varies linearly with the extrusion tendency. Specifically, the easier it is to extrude from a die, the shorter is the dead time and the lower is the pressure rise. Since the product extrusion tendency can therefore be judged by detecting the dead time, it is possible to switch between feedforward and feedback control based on the maximum torque.
  • the controller and control method according to his invention make it possible to collect highly accurate data and, by ascertaining the ram behavior during extrusion of aluminum products from this data, to determine the extrusion tendencies of individual aluminum products in advance, thereby enabling fine control utilizing real time data with respect to a large number of product types.
  • the control signal is not calculated from ordinary integrated values but from the steady torque, overshooting resulting from integration error and low measurement accuracy is reduced.
  • the extrusion tendency can be judged during product extrusion preparatory operation and the dead time, it becomes possible to switch between feedback control and feedforward control based on maximum output from immediately after the start of extrusion. In combination, these advantages of the invention reduce the time required for extrusion processing, increase production per unit time, and increase operating efficiency.
  • the laser speed sensor is provided independently of the other equipment, measurement error resulting from noise can be reduced. As data can therefore be collected at high speed and no need arises from the viewpoint of control for the data to be filtered, the internal filtering capability required by conventional systems is unnecessary and control response is proportionally higher.
  • the speed of the hydraulic unit can be computer controlled automatically in real time using a control gain calculated in a stepless manner from the comparison value, fine response can be achieved and predictive control taking hydraulic lag into account can be realized.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Extrusion Of Metal (AREA)
  • Feedback Control In General (AREA)
EP19950102833 1994-02-28 1995-02-28 Regler und Regelungsverfahren für Aluminium-Strangpresse Expired - Lifetime EP0671226B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP5444294A JPH07236913A (ja) 1994-02-28 1994-02-28 アルミ形材押出機の制御装置および制御方法
JP54442/94 1994-02-28

Publications (2)

Publication Number Publication Date
EP0671226A1 true EP0671226A1 (de) 1995-09-13
EP0671226B1 EP0671226B1 (de) 1998-11-18

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP19950102833 Expired - Lifetime EP0671226B1 (de) 1994-02-28 1995-02-28 Regler und Regelungsverfahren für Aluminium-Strangpresse

Country Status (3)

Country Link
EP (1) EP0671226B1 (de)
JP (1) JPH07236913A (de)
DE (1) DE69506015T2 (de)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3649816A (en) * 1970-11-09 1972-03-14 Allegheny Ludlum Ind Inc Control system for hydraulic extrusion press
DE3307415A1 (de) * 1983-03-02 1984-09-06 Mannesmann Rexroth GmbH, 8770 Lohr Anordnung zur zugkraftregelung eines aus einer strangpresse austretenden und durch eine kalibriereinrichtung gefuehrten pressstange
DE3329314A1 (de) * 1983-08-13 1985-02-28 Julius & August Erbslöh GmbH & Co, 5600 Wuppertal Verfahren zum konstanthalten der pressgeschwindigkeit von strangpressen fuer metallprofile
JPS61135416A (ja) * 1984-12-04 1986-06-23 Ube Ind Ltd 押出プレス
JPS63160720A (ja) * 1986-12-24 1988-07-04 Kobe Steel Ltd 押出プレスの押出速度制御装置

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07102390B2 (ja) * 1988-02-16 1995-11-08 住友金属工業株式会社 押出プレスの押出速度制御方法
JPH01309718A (ja) * 1988-06-08 1989-12-14 Nippon Alum Mfg Co Ltd 押出し成形速度制御装置

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3649816A (en) * 1970-11-09 1972-03-14 Allegheny Ludlum Ind Inc Control system for hydraulic extrusion press
DE3307415A1 (de) * 1983-03-02 1984-09-06 Mannesmann Rexroth GmbH, 8770 Lohr Anordnung zur zugkraftregelung eines aus einer strangpresse austretenden und durch eine kalibriereinrichtung gefuehrten pressstange
DE3329314A1 (de) * 1983-08-13 1985-02-28 Julius & August Erbslöh GmbH & Co, 5600 Wuppertal Verfahren zum konstanthalten der pressgeschwindigkeit von strangpressen fuer metallprofile
JPS61135416A (ja) * 1984-12-04 1986-06-23 Ube Ind Ltd 押出プレス
JPS63160720A (ja) * 1986-12-24 1988-07-04 Kobe Steel Ltd 押出プレスの押出速度制御装置

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 10, no. 331 (M - 533)<2387> 11 November 1986 (1986-11-11) *
PATENT ABSTRACTS OF JAPAN vol. 12, no. 424 (M - 761)<3271> 10 November 1988 (1988-11-10) *

Also Published As

Publication number Publication date
DE69506015T2 (de) 1999-07-22
DE69506015D1 (de) 1998-12-24
EP0671226B1 (de) 1998-11-18
JPH07236913A (ja) 1995-09-12

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