EP1899087A1 - Procede de controle en continu de l'epaisseur du fond des ebauches filees des boitiers aerosols - Google Patents
Procede de controle en continu de l'epaisseur du fond des ebauches filees des boitiers aerosolsInfo
- Publication number
- EP1899087A1 EP1899087A1 EP06764807A EP06764807A EP1899087A1 EP 1899087 A1 EP1899087 A1 EP 1899087A1 EP 06764807 A EP06764807 A EP 06764807A EP 06764807 A EP06764807 A EP 06764807A EP 1899087 A1 EP1899087 A1 EP 1899087A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- thickness
- reference point
- temperature
- given
- measurement
- 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
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES, PROFILES OR LIKE SEMI-MANUFACTURED PRODUCTS OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C31/00—Control devices for metal extruding, 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES, PROFILES OR LIKE SEMI-MANUFACTURED PRODUCTS OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C23/00—Extruding metal; Impact extrusion
- B21C23/02—Making uncoated products
- B21C23/18—Making uncoated products by impact extrusion
- B21C23/186—Making uncoated products by impact extrusion by backward extrusion
Definitions
- the invention relates to the manufacture of metal housings, in particular for aerosol dispensers, by shock-spinning. It relates more particularly to the continuous control of the thickness of the bottom of the shock-spun blanks which, after a possible stretching, are then conifted to produce the metal housing / o in one piece, typically aluminum alloy, distributors aerosols. This method can be applied to the online control of any part obtained by spinning.
- the blanks of the aerosol containers are in the form of boxes having a cylindrical wall open at one of their ends and connected at their other end to a bottom generally flat and perpendicular to the axis of the cylindrical wall.
- This blank is generally obtained by spinning of 0 cylindrical pins in an operation called “inverse spinning” by the blacksmiths but we prefer to call here “back extrusion”, the term “inverse spinning” being used by the spinners to designate a different shaping operation, where the metal, in the form of a billet carried at high temperature and confined in the bore of a container, is urged to pass through
- the central orifice (or several orifices located near the center) of a die which penetrates into said container to produce metal profiles of great length.
- the material is also confined in a cavity of the tool, it is solicited by a moving part of the tool to flow to tr ⁇ vers an opening on this part of the tool, but this opening is a peripheral opening, so that the radial component of the flow of the material is centrifugal and not centripetal.
- the operation is carried out without preheating the pieces, with a speed of
- FIG 1 shows the operating principle of a conventional "shock" spinning press.
- the spinning press has two parts: an active part
- Punch 10 in the direction of the die.
- the latter hits the pawn and the spatial configuration offered by the punch and the matrix imposes on the metal, at the moment of impact, a large plastic deformation which results in the production, by a rear extrusion, of a hollow casing 100 with a wall 110 and a bottom 120.
- the diameter of the housing is generally close to
- the slenderness (height / diameter) of the case is gener ⁇ l between 1 and 5.
- the bottom is generally flat and its thickness is thinner than that of the starting pawn.
- the punch is animated by an alternating axial movement, its end passing from a "high point” close to the matrix to a “lower point” further away.
- the reciprocating movement is ensured by means of a rod 21 articulated on the one hand on the end 11 of the punch and on the other hand on a movable axis 22 also connected to a reference point 23 and to a crankshaft 26 rotating around a fixed axis A.
- the movable axis 22 is not fixed directly to the crankshaft 26 but is connected thereto via a rigid rod 24 whose ends are articulated on said movable axis 22 and on a crankpin 25 of the crankshaft 26. It is also connected to a reference point 23 whose positioning is in principle fixed but adjustable at any time, for example by means of a wedge-screw system 40.
- the position of the "high point of the punch and therefore that of the reference point 23 have a strong influence on the thickness of the bottom of the spun product. It can be changed at any time, even when the crankshaft rotates.
- This method is generally used to make the blanks of the aerosol dispenser housings.
- the bottom of these blanks remains generally flat because it is often at the level of the coniferous that it is shaped inverted dome.
- the shape of the bottom is designed so that the latter has on one hand a stable base and on the other hand resists the pressure difference between the outside and the inside of the aerosol dispenser. Thickness that is a little too low may cause the bottom to "turn over" and should be avoided.
- a first object according to the invention is a method for measuring the thickness of the bottom of the cylindrical casings spun by impact, based on the measurement of the temperature of the spinning tool, said spinning tool comprising a movable part with a punch and a passive part with a matrix, characterized in that said temperature measurement is performed at a point of the passive part of the tool, and in that, for a given production line, a given housing geometry and a given alloy, the temperature thus measured is associated with the imposed production rate and the position of a reference point associated with the moving part of the tool to estimate the thickness obtained.
- the punch performs reciprocating movements in a given direction using a mechanical system, typically a linkage system associated with a crankshaft, articulated from a reference point which is the link between said mechanical system and the frame of the spinning machine.
- a mechanical system typically a linkage system associated with a crankshaft
- the position of said reference point is defined with respect to said direction, which will be referred to hereinafter as "axial direction”.
- It is a method of indirectly measuring the thickness of the bottom of the spun products which involves a temperature measurement not on the punch but on the passive part of the tool, at a point distant from the zone impact of the punch, particularly at a point in the die, preferably at the anvil, or grain.
- This temperature-sensing zone is moved away from the shaping zone by a distance of the order of the diameter of the product to be spun.
- a measurement point located in the grain is chosen near the interface with the anvil, typically at a distance of between 1 and 20 millimeters from said interface.
- this temperature measurement is not enough and it is associated with it, to obtain a good correlation with the background softener, the production rate, itself directly related to the speed of rotation of the crankshaft.
- R (e, T, X, C) 0 where e is the thickness of the bottom, T is the temperature measured at a given point of the tooling, X is the axial positioning of the reference point, defined with respect to a fixed point of the spinning press, that is to say, typically an anchor point of the machine, and C is the rate of production.
- the rise in temperature of the tooling 5 during this dead time is a few degrees Celsius and causes a decrease in the bottom thickness of at most a few tenths of a micrometer, which is very small in comparison with the differences noted in the conditions. industrial manufacturing on the thickness of the bottom that we want to control.
- thermocouple In practice, it is found that even in the case where the thermocouple is placed in the grain, that is to say far enough away from the box forming zone (distance of the order of magnitude of the diameter of the spinning pawn), this relationship proves effective. Despite the remoteness of the measuring point, a variation in the production rate results in an increase in
- the immediate temperature at the punch is detected rapidly, that is to say after about ten seconds in the grain.
- C production rate C production rate
- X position of the reference point The thickness e, obtained in steady state, is measured by palmer on the extruded blanks.
- the temperature T is measured at the chosen point, located in the passive part of the tooling, preferably at a distance corresponding approximately to the diameter of the spun blank, typically in the
- f is a decreasing monotonic function of the temperature T measured at a point in the passive part of the tooling
- g is a monotonic function of the position of the reference point of the linkage, decreasing if the longitudinal axis used to define the X coordinate is oriented from the reference point to the matrix
- h is a monotonic decreasing function of the production rate.
- the functions f, g and h are defined once and for all for a given production line, a given spun gear geometry and an alloy given, for example, using the experimental plane mentioned above.
- the coefficient ao is an adjustment parameter estimated at each tool replacement. It is necessary to wait for the press to operate in steady state, that is to say typically 10 to 15 minutes of walking in constant cadence after the change of tools. The spun products are then taken and the thickness of their bottom is measured directly, for example by cutting the bottom and making a measurement by palmer.
- the corrective action can be either a correction on the positioning of the reference point or a correction on the rate of production. It goes without saying that the production rate should, as far as possible, be as high as possible and therefore not an ideal parameter for regulation. Of Therefore, preference will be given to the positioning of the reference point by regulating with respect to the set point value Xc of the reference point indicated above.
- the corrective action consists in imposing on the reference point a displacement a (X-Xc) in the axial direction, a being in absolute value a coefficient close to 1, typically between 0.5 and 1, which depends on the correction dynamics of the motor used for the system controlling the axial displacement of the reference point, for example the wedge-screw system described in the example below.
- the correction on the position of the reference point is preferably done by acting on a wedge / screw-type system such as that referenced 40 or any other equivalent system making it possible to control or to enslave an axial displacement.
- the assembly is fixed on a fixed part of the frame of the machine by means of a base 42.
- a screw 43 is rotated, for example with the aid of a servo motor, and the screw moves a wedge 44 in a direction perpendicular to the axis of the punch. By moving, this wedge acts via its oblique face on the position of the part 41 on which is fixed the reference point 23.
- FIG. 3 Particular embodiment of the invention
- shock-spun blanks are obtained from 1050 alloy pegs (reference according to the Aluminum Association standard) with a thickness of 6.5 mm.
- the temperature measurement is carried out using a thermocouple 50 in a point 36 of the passive part of the tool, away from the impact zone of the punch, and located at the level of the grain 33. More precisely it is 10 mm below the interface between the anvil 31 and the grain 33.
- the coefficient ao is an adjustment parameter estimated at each tool replacement. It is necessary to wait for the press to operate in steady state, that is to say typically 10 to 15 minutes of walking in constant cadence after the change of tools. The spun products are then taken and the thickness of their bottom is measured directly, for example by cutting the bottom and making a measurement by palmer.
- the thickness is regulated by acting on the position of the reference point 23.
- the principle consists in calculating a reference position Xc of the reference point by using the model developed for estimating the thickness.
- the equation giving this setpoint position is easily obtained:
- X c g- '(ei - ( ao + f (T) + h (C))) the functions f, g and h having been defined thanks to the experimental design carried out once and for all on the production line given, the coefficient of registration ao being defined at each renewal of tooling and the thickness ei being the thickness referred to.
- thermocouple 50 the temperature is continuously measured at point 36 of the passive part of the tooling using thermocouple 50.
- X from the reference point 23 by means of a linear displacement sensor and this value is compared with the reference value Xc.
- the deviation X-Xc is used as a correction parameter to act on the position of the reference point via the corner-screw system 40.
- the precise positioning of the reference point 23 is controlled by means of a sensor Linear displacement type LVDT which connects the base 42 to the part 41.
- This slaving has the advantage of not requiring an in-depth transformation of the control automaton of the production line which already has a system for measuring rates and positioning. It is enough to add a measurement of temperature, to improve the control of the positioning by means of a sensor of linear displacement judiciously placed and to introduce a software of regulation based on the model of estimate of the thickness exposed above.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Forging (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
- Colloid Chemistry (AREA)
- Extrusion Of Metal (AREA)
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR0506469A FR2887622A1 (fr) | 2005-06-24 | 2005-06-24 | Procede de controle en continu de l'epaisseur du fond des ebauches filees des boitiers aerosols |
| PCT/FR2006/001414 WO2006136708A1 (fr) | 2005-06-24 | 2006-06-22 | Procede de controle en continu de l'epaisseur du fond des ebauches filees des boitiers aerosols |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP1899087A1 true EP1899087A1 (fr) | 2008-03-19 |
| EP1899087B1 EP1899087B1 (fr) | 2008-10-01 |
| EP1899087B8 EP1899087B8 (fr) | 2008-12-31 |
Family
ID=35686538
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP06764807A Not-in-force EP1899087B8 (fr) | 2005-06-24 | 2006-06-22 | Procede de controle en continu de l'epaisseur du fond des ebauches filees des boitiers aerosols |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP1899087B8 (fr) |
| AT (1) | ATE409530T1 (fr) |
| DE (1) | DE602006002988D1 (fr) |
| FR (1) | FR2887622A1 (fr) |
| WO (1) | WO2006136708A1 (fr) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102012101952B4 (de) * | 2012-03-08 | 2016-03-03 | Schuler Pressen Gmbh | Presse sowie Verfahren zur Herstellung eines Dosenkörpers mit automatischer Einstellung der Bodendicke |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3289450A (en) * | 1963-11-26 | 1966-12-06 | Minster Machine Co | Can extrusion machine |
-
2005
- 2005-06-24 FR FR0506469A patent/FR2887622A1/fr active Pending
-
2006
- 2006-06-22 AT AT06764807T patent/ATE409530T1/de not_active IP Right Cessation
- 2006-06-22 DE DE602006002988T patent/DE602006002988D1/de not_active Expired - Fee Related
- 2006-06-22 WO PCT/FR2006/001414 patent/WO2006136708A1/fr not_active Ceased
- 2006-06-22 EP EP06764807A patent/EP1899087B8/fr not_active Not-in-force
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2006136708A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| EP1899087B1 (fr) | 2008-10-01 |
| ATE409530T1 (de) | 2008-10-15 |
| WO2006136708A1 (fr) | 2006-12-28 |
| EP1899087B8 (fr) | 2008-12-31 |
| DE602006002988D1 (de) | 2008-11-13 |
| FR2887622A1 (fr) | 2006-12-29 |
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