CA2318831A1 - Method and device for the deformation by hydrodynamic drawing of multi-layer composite wire by means of lubricant-supplied multiple drawing machines - Google Patents
Method and device for the deformation by hydrodynamic drawing of multi-layer composite wire by means of lubricant-supplied multiple drawing machines Download PDFInfo
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- CA2318831A1 CA2318831A1 CA002318831A CA2318831A CA2318831A1 CA 2318831 A1 CA2318831 A1 CA 2318831A1 CA 002318831 A CA002318831 A CA 002318831A CA 2318831 A CA2318831 A CA 2318831A CA 2318831 A1 CA2318831 A1 CA 2318831A1
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- pressure
- pressure chamber
- lubricant
- wire
- die
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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
- B21C3/00—Profiling tools for metal drawing; Combinations of dies and mandrels
- B21C3/02—Dies; Selection of material therefor; Cleaning thereof
- B21C3/12—Die holders; Rotating dies
- B21C3/14—Die holders combined with devices for guiding the drawing material or combined with devices for cooling heating, or lubricating
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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
- B21C9/00—Cooling, heating or lubricating drawing material
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Abstract
The invention relates to a method and device for the deformation by hydrodynamic drawing of multi-layer composite wire (8) by means of lubricantsupplied multiple drawing machines. According to said method, before the multiple drawing machine is started or restarted, directly in front of the drawing die (4) of each drawing stage a hydrostatic starting pressure acting on the drawing and other lubricant supplied thereto and on the multi-layer composite wire (6) is generated in the drawing slot by means of a heated pressure chamber (10) through which the multi-layer composite wire extends. In this way especially multi-layer composite wires (6) with a high-strength core and a soft sheath can be deformed in a high-quality manner, and during ongoing continuous drawing in a known manner hydrodynamic pressure conditions continue to be generated in the drawing slot by the entrainment of lubricant.
Description
w Method and Apparatus for the Hydrodynamic Draw Forming of Laminated Compound Wire by means of Lubricant-Pressurised Multi-Stage Drawing Plants Description The invention relates to a method and an apparatus for the hydrodynamic draw forming of laminated compound wire by means of lubricant-pressurised multi-stage drawing plants according to the preamble of Claim 1 or 4, respectively.
The processing of compound wires by drawing with hard metal wire dies under the employment of special drawing auxiliary means, in particular in the case of hard-to-form materials, is known per se.
In WO 96/14946, for example, a method and an apparatus for forming and coating of bar-shaped metallic forming stock was proposed, with solid, semi-solid, and liquid lubricants being employed therein, which generate a lubricant layer on the forming stock.
According to the solution therein, a pressure chamber is pro-vided which comprises a feeding means for lubricant. Upon drawing of the bar-shaped metallic forming stock through the pressure chamber the lubricant is pressed onto the surface of the forming stock, whereby it is possible to perform several forming stages without further intermediate coatings.
Actually, according to WO 96/14946, the steel wire which is advanced through the pressure chamber at a speed of 1.5 m/s is coated at approx. 40°C with a homogenous, thin, and securely adhering lubricant film of lubricant which is subjected to a pressure of 150 MPa. This steel wire coated in said manner is then guided to a wire die formed as a discharge nozzle, while the lubricant is applied thereto in such a manner that it should be possible to subject the steel wire to further form-ing operations without additional lubricant.
a In the case of a production-related interruption of the pass-age of the forming stock through the known pressure chamber, which e.g. may occur due to wire breakage or other known problems, a brief reversal of the relative movement which exists between forming stock and forming tool during the forming process and/or a reduction of the pressure generated in the pressure chamber and acting on the lubricant is effected for restarting.
However, it was found that the method described in WO 96/
14964 does not permit a high quality forming operation, if it is required to process laminated compound wires with a high-strength core material and an extremely soft sheathing mate-rial.
When jointly drawing such a compound wire, the soft sheathing material is stripped off the core, in particular during start-ing or restarting, and seizure of the material in the wire die occurs. In the case of restarting in multi-stage drawing plants, the drawing agent pressure in so-called hydrodynamic drawing is relieved after the shutting-down of the plant. In this case, there is the latent risk that the wire die penet-rates the residually remaining drawing agent layer due to the wire relief so that upon a restart the wire material adheres to the tool surface, i.e. the wire die, with the already described disadvantageous consequences of seizure or a wire breakage.
If the interaction to be observed between the pressure and temperature ratios at or in the wire die and thus of the drawing agent is neglected or taken into consideration in-sufficiently, the drawing agent will be liquefied in operation due to self-heating when drawing, on the one hand, with the consequence of a breakdown of the hydrodynamic ratios. In order to counteract this, drawing agent or lubricant, res-pectively, is continuously fed according to WO 96/14946, with the technical expenditure therefor being considerable.
With the mentioned manufacturing downtimes - which occur ' several times a day, even with optimum production conditions -a glass-like plug of lubricant will form due to cooling down processes, on the other hand, with the risk of an above ex-plained wire breakage.
From US 3,641,795 a pressure chamber is known into which lubricant is introduced via a feed opening which is initially closed on one side, with the lubricant being distributed and compacted by means of a so-called vibration wire. A further compacting action is effected by means of a hydraulic unit.
After the prepacking done in this manner, a through hole is formed in the compacted lubricant which is located in the interior of the apparatus, and the apparatus is integrated in the drawing plant. However, a controlled set pressure, in particular during starting or restarting of a multi-stage drawing plant, is not possible with the solution according to US 3,641,795. When the plant is shut down after a certain operating time, there is no longer a sufficient residual pressure available so that the known apparatus must be dis-assembled and another prepacking must be carried out.
From EP 0 013 012 A1 it is known to liquefy a semi-solid or solid lubricant at room temperature under the effect of pressure and/or heat. However, such a liquefaction of the lubricant extremely disadvantageous because there is the risk that lubricant is pressed out of the drawing gap, without de-veloping the lubricating effect.
Based on that which is known, it is therefore the object of the invention to provide a method and an apparatus for the hydrodynamic draw forming of laminated compound wire by means of lubricant-pressurised multi-stage drawing plants which for p, compound wires with an extremely hard core material as well as soft sheathing material allow a safe starting and restarting of the plant without the risk of a wire breakage or of a reduced drawing quality.
The solution according to the invention is effected by means of a method as defined according to Claim 1 and by means of an apparatus with the characteristics of Claim 4, with the de-pendent claims comprising at least suitable embodiments and further developments.
Thus, the basic idea of the invention is to build up a lubric-ant or drawing agent pressure upon starting or restarting of the multi-stage drawing plant immediately upstream of each wire die of the respective drawing stage by means of a local pressure chamber so that the forming stock can pass the draw-ing process with the desired success. During the actual draw-ing operation the conditions generated for pressure and temperature of the lubricant are maintained by means of hydro-dynamic effects known per se in the interaction between form-ing stock, lubricant, and wire die as well as heat energy released upon forming and cooling down of the wire die.
With the inventive method as well as the associated apparatus, quasi hydrostatic pressure ratios for the lubricant are gener-ated already as early as upon the commencement of the drawing process so that the disadvantageous retraction of the forming stock which occurs in the state of the art can be omitted.
In a preferred embodiment of the invention, the method for draw forming is designed as follows.
Prior to starting or restarting of a multi-stage drawing plant known per se and immediately upstream of the wire die of each drawing stage a hydrostatic starting pressure is built-up in the drawing gap by means of a heated pressure chamber through which the laminated compound wire passes, which acts on the drawing and lubricating agent introduced into same, so that in ' particular the mentioned laminated compound wires with high-s strength core and soft sheathing material can be formed in a high quality manner. It is to be noted in this context that a laminated compound wire with a high-strength steel core and an aluminium sheathing could be safely formed, with the sheathing proportion being as high as up to 70 percent by volume.
Furthermore, the method provides for hydrodynamic pressure ratios which are building up in the drawing gap in a manner known per se during the ongoing continuous drawing by carrying along the lubricant.
The starting pressure for each drawing stage is preset and monitored by a hydraulic controller, with the preheating of the pressure chambers being also controlled. Upon reaching a selectable pressure/temperature range in all stages, an enable signal is generated which initiates the commencement of the drawing operation.
During the drawing operation, the pressure and temperature ratios in each pressure chamber are continuously monitored, with the separate heating unit of the pressure chamber being deactivatable upon the beginning of the heating of the wire dies by the drawing operation.
According to a preferred embodiment, a starting or restarting pressure ranging from 100 to 130 bar is set in the pressure chamber of each drawing stage.
The inventive apparatus is assumed to be a multi-stage drawing plant, with each drawing stage comprising at least one pre-die and one wire die and with a lubricant feed means being known per se being arranged at the pre-die.
Between pre-die and wire die, a heated pressure chamber is provided which forms an integral structural unit with these.
The pressure chamber comprises a wire passage as well as a ' lateral lubricant channel for accommodating the initial lubricant quantity.
In addition a pressure generating means which can preferably be operated hydraulically is arranged at the pressure chamber in such manner that the lubricant supplied to the lubricant channel via a further lubricant feeding means can be pressed into the passage or the corresponding pressure chamber interior, respectively, and that a pasty condition of the lubricant is obtained in conjunction with the heating means provided in the pressure chamber.
The desired lubricant pressure in the lubricant channel or in the pressure chamber interior, respectively, is maintained by means of a pressure plunger which is guided at least partially in the lateral lubricant channel and which can be actuated by a hydraulic cylinder. The movement or position of the plunger is detected by means of a suitable sensor system and serves for the indirect determination of the pressure ratios in the pressure chamber.
According to a basic idea of the invention, the pressure chamber is inserted between the pre-die and the wire die of a conventional double die arrangement, and in its entirety has a small installation size. For the formation of a structural unit, the seats of pre-die and wire die as well as the pressure chamber have mating holes extending in the drawing direction, which guide corresponding fastening means such as tension bolts.
In addition, the pressure chamber preferably comprises lateral holes or recesses for the accommodation of electrical heating elements as well as at least one temperature sensor, in order to be able to monitor and adjust the defined temperature ratios upon starting or restarting of the plant in each draw-ing stage.
A pressure/temperature regulating means monitors the pressure and temperature ratios of all pressure chamber of the drawing stages and enables the start as well the restart of the draw-ing plant. In addition it is possible to control a wire die cooling unit which is known per se in accordance with extern-ally specifiable parameters.
From the above it becomes apparent that the pressure chamber upstream of each drawing stage, which forms a structural unit with the pre-die and the wire die, is only subjected to an ex-ternal pressure if a starting or restarting is necessary. The lubricant quantity to be supplied for starting or restarting, which is to be introduced into the pressure chamber via the lateral lubricant channel is small so that the provision of spacious reservoirs for the additional lubricant supply can be omitted.
Ultimately, the pressure/temperature regulating means of the inventive apparatus also serves for continuously monitoring the drawing process, because pressure drops in the pressure chamber during the continuous operation of the drawing plant indicate irregularities of the drawing process or of the form-ing stock.
Thus, a method and an apparatus are achieved by means of the invention, for the hydrodynamic draw forming of laminated com-pound wire by means of lubricant-pressurised multi-stage draw-ing plants, with the focus being placed on a safe starting and restarting of the plant without the risk of wire breakage or reduced drawing quality. The method provides for building up a hydrostatic starting pressure in the drawing gap upstream of the wire die of each drawing stage by means of a heated pressure chamber, which acts on the drawing agent and lubric-ant being introduced therein and on the laminated compound wire as well as for a controlled preheating. When defined pressure and temperature ratios are prevailing for all chambers, the drawing operation will be enabled. Therefore, the drawing agent and lubricant is brought into a pasty con-dition in the very beginning so that with the commencement of the drawing movement, hydrodynamic ratios will develop which during the ongoing, continuous drawing process permit an ade-quate lubricant supply in the drawing gap.
In the embodiment of the invention it is checked by the con-tinuous monitoring of pressure and temperature in each pressure chamber when and to what extent a provided separate heating unit is to be deactivated because of the beginning heating in the drawing process. The different heat generation in the respective drawing stages is then taken into consider-ation.
The invention will be explained more detailed in the following with reference to an embodiment and with the aid of figures.
These show:
Figs. la and lb, each, a side view and a plan view of the drawing stage assembly, comprising pre-die and wire die as well as pressure chamber; and Fig. 2 a sectional view of the pressure chamber.
Each of the drawing stages 1 according to Figs. la and lb com-prises a pre-die seat 2, a pressure chamber 3, and a wire die seat 4 with a wire die (not shown). A lubricant box 5 which is known per se and illustrated by broken lines serves for accom-modating the lubricant which in the current drawing operation provides for hydrodynamic pressure ratios in and around the drawing gap.
The laminated compound wire 6 to be formed now enters the pressure chamber 3 via the lubricant box 5, the pre-die seat 2 and subsequently the wire die provided in the wire die seat 4, in order to be subjected therein to the actual stage-by-stage forming.
As can be seen from the plan view according to Fig. lb, the pressure chamber 3 comprises a laterally arranged hydraulic cylinder 12 which in cooperation with the elements shown in Fig. 2 forms a pressure generating means 9. Sensors 17 monitor the position of a pressure plunger not shown in Fig. lb, in order to indirectly detect the pressure ratios in the pressure chamber 3. Furthermore, a wire die cooling unit 16 known per se is provided at the wire die seat 4.
The elements pre-die seat 2, pressure chamber 3, wire die seat 4, as well as pressure generating means 9 form an assembly which is supported by a base plate 18.
The construction of the pressure chamber will now be explained in more detail with reference to the sectional view according to Fig. 2. The pressure chamber 3 comprises a lateral lubric-ant channel 8 which leads to the wire passage 7 of the pressure chamber 3. A hopper-type feeding means 11 serves for the supply of lubricant in the case of starting or restarting of the drawing plant.
A pressure plunger 10 is arranged in the pressure generating means 9 and is actuated by the hydraulic cylinder 12, i.e.
displaced in the direction of the wire passage 7 of the pressure chamber 3. The plunger 10 is guided at least partial-ly in the lateral lubricant channel 8, and builds up the pressure ratios in the pressure chamber, i.e. in the pressure chamber interior of the wire passage 7.
In addition, the pressure chamber 3 has holes 13 for accommo-dating preferably electrical heating elements, as well as a hole 14 which serves for securing a temperature sensor.
The processing of compound wires by drawing with hard metal wire dies under the employment of special drawing auxiliary means, in particular in the case of hard-to-form materials, is known per se.
In WO 96/14946, for example, a method and an apparatus for forming and coating of bar-shaped metallic forming stock was proposed, with solid, semi-solid, and liquid lubricants being employed therein, which generate a lubricant layer on the forming stock.
According to the solution therein, a pressure chamber is pro-vided which comprises a feeding means for lubricant. Upon drawing of the bar-shaped metallic forming stock through the pressure chamber the lubricant is pressed onto the surface of the forming stock, whereby it is possible to perform several forming stages without further intermediate coatings.
Actually, according to WO 96/14946, the steel wire which is advanced through the pressure chamber at a speed of 1.5 m/s is coated at approx. 40°C with a homogenous, thin, and securely adhering lubricant film of lubricant which is subjected to a pressure of 150 MPa. This steel wire coated in said manner is then guided to a wire die formed as a discharge nozzle, while the lubricant is applied thereto in such a manner that it should be possible to subject the steel wire to further form-ing operations without additional lubricant.
a In the case of a production-related interruption of the pass-age of the forming stock through the known pressure chamber, which e.g. may occur due to wire breakage or other known problems, a brief reversal of the relative movement which exists between forming stock and forming tool during the forming process and/or a reduction of the pressure generated in the pressure chamber and acting on the lubricant is effected for restarting.
However, it was found that the method described in WO 96/
14964 does not permit a high quality forming operation, if it is required to process laminated compound wires with a high-strength core material and an extremely soft sheathing mate-rial.
When jointly drawing such a compound wire, the soft sheathing material is stripped off the core, in particular during start-ing or restarting, and seizure of the material in the wire die occurs. In the case of restarting in multi-stage drawing plants, the drawing agent pressure in so-called hydrodynamic drawing is relieved after the shutting-down of the plant. In this case, there is the latent risk that the wire die penet-rates the residually remaining drawing agent layer due to the wire relief so that upon a restart the wire material adheres to the tool surface, i.e. the wire die, with the already described disadvantageous consequences of seizure or a wire breakage.
If the interaction to be observed between the pressure and temperature ratios at or in the wire die and thus of the drawing agent is neglected or taken into consideration in-sufficiently, the drawing agent will be liquefied in operation due to self-heating when drawing, on the one hand, with the consequence of a breakdown of the hydrodynamic ratios. In order to counteract this, drawing agent or lubricant, res-pectively, is continuously fed according to WO 96/14946, with the technical expenditure therefor being considerable.
With the mentioned manufacturing downtimes - which occur ' several times a day, even with optimum production conditions -a glass-like plug of lubricant will form due to cooling down processes, on the other hand, with the risk of an above ex-plained wire breakage.
From US 3,641,795 a pressure chamber is known into which lubricant is introduced via a feed opening which is initially closed on one side, with the lubricant being distributed and compacted by means of a so-called vibration wire. A further compacting action is effected by means of a hydraulic unit.
After the prepacking done in this manner, a through hole is formed in the compacted lubricant which is located in the interior of the apparatus, and the apparatus is integrated in the drawing plant. However, a controlled set pressure, in particular during starting or restarting of a multi-stage drawing plant, is not possible with the solution according to US 3,641,795. When the plant is shut down after a certain operating time, there is no longer a sufficient residual pressure available so that the known apparatus must be dis-assembled and another prepacking must be carried out.
From EP 0 013 012 A1 it is known to liquefy a semi-solid or solid lubricant at room temperature under the effect of pressure and/or heat. However, such a liquefaction of the lubricant extremely disadvantageous because there is the risk that lubricant is pressed out of the drawing gap, without de-veloping the lubricating effect.
Based on that which is known, it is therefore the object of the invention to provide a method and an apparatus for the hydrodynamic draw forming of laminated compound wire by means of lubricant-pressurised multi-stage drawing plants which for p, compound wires with an extremely hard core material as well as soft sheathing material allow a safe starting and restarting of the plant without the risk of a wire breakage or of a reduced drawing quality.
The solution according to the invention is effected by means of a method as defined according to Claim 1 and by means of an apparatus with the characteristics of Claim 4, with the de-pendent claims comprising at least suitable embodiments and further developments.
Thus, the basic idea of the invention is to build up a lubric-ant or drawing agent pressure upon starting or restarting of the multi-stage drawing plant immediately upstream of each wire die of the respective drawing stage by means of a local pressure chamber so that the forming stock can pass the draw-ing process with the desired success. During the actual draw-ing operation the conditions generated for pressure and temperature of the lubricant are maintained by means of hydro-dynamic effects known per se in the interaction between form-ing stock, lubricant, and wire die as well as heat energy released upon forming and cooling down of the wire die.
With the inventive method as well as the associated apparatus, quasi hydrostatic pressure ratios for the lubricant are gener-ated already as early as upon the commencement of the drawing process so that the disadvantageous retraction of the forming stock which occurs in the state of the art can be omitted.
In a preferred embodiment of the invention, the method for draw forming is designed as follows.
Prior to starting or restarting of a multi-stage drawing plant known per se and immediately upstream of the wire die of each drawing stage a hydrostatic starting pressure is built-up in the drawing gap by means of a heated pressure chamber through which the laminated compound wire passes, which acts on the drawing and lubricating agent introduced into same, so that in ' particular the mentioned laminated compound wires with high-s strength core and soft sheathing material can be formed in a high quality manner. It is to be noted in this context that a laminated compound wire with a high-strength steel core and an aluminium sheathing could be safely formed, with the sheathing proportion being as high as up to 70 percent by volume.
Furthermore, the method provides for hydrodynamic pressure ratios which are building up in the drawing gap in a manner known per se during the ongoing continuous drawing by carrying along the lubricant.
The starting pressure for each drawing stage is preset and monitored by a hydraulic controller, with the preheating of the pressure chambers being also controlled. Upon reaching a selectable pressure/temperature range in all stages, an enable signal is generated which initiates the commencement of the drawing operation.
During the drawing operation, the pressure and temperature ratios in each pressure chamber are continuously monitored, with the separate heating unit of the pressure chamber being deactivatable upon the beginning of the heating of the wire dies by the drawing operation.
According to a preferred embodiment, a starting or restarting pressure ranging from 100 to 130 bar is set in the pressure chamber of each drawing stage.
The inventive apparatus is assumed to be a multi-stage drawing plant, with each drawing stage comprising at least one pre-die and one wire die and with a lubricant feed means being known per se being arranged at the pre-die.
Between pre-die and wire die, a heated pressure chamber is provided which forms an integral structural unit with these.
The pressure chamber comprises a wire passage as well as a ' lateral lubricant channel for accommodating the initial lubricant quantity.
In addition a pressure generating means which can preferably be operated hydraulically is arranged at the pressure chamber in such manner that the lubricant supplied to the lubricant channel via a further lubricant feeding means can be pressed into the passage or the corresponding pressure chamber interior, respectively, and that a pasty condition of the lubricant is obtained in conjunction with the heating means provided in the pressure chamber.
The desired lubricant pressure in the lubricant channel or in the pressure chamber interior, respectively, is maintained by means of a pressure plunger which is guided at least partially in the lateral lubricant channel and which can be actuated by a hydraulic cylinder. The movement or position of the plunger is detected by means of a suitable sensor system and serves for the indirect determination of the pressure ratios in the pressure chamber.
According to a basic idea of the invention, the pressure chamber is inserted between the pre-die and the wire die of a conventional double die arrangement, and in its entirety has a small installation size. For the formation of a structural unit, the seats of pre-die and wire die as well as the pressure chamber have mating holes extending in the drawing direction, which guide corresponding fastening means such as tension bolts.
In addition, the pressure chamber preferably comprises lateral holes or recesses for the accommodation of electrical heating elements as well as at least one temperature sensor, in order to be able to monitor and adjust the defined temperature ratios upon starting or restarting of the plant in each draw-ing stage.
A pressure/temperature regulating means monitors the pressure and temperature ratios of all pressure chamber of the drawing stages and enables the start as well the restart of the draw-ing plant. In addition it is possible to control a wire die cooling unit which is known per se in accordance with extern-ally specifiable parameters.
From the above it becomes apparent that the pressure chamber upstream of each drawing stage, which forms a structural unit with the pre-die and the wire die, is only subjected to an ex-ternal pressure if a starting or restarting is necessary. The lubricant quantity to be supplied for starting or restarting, which is to be introduced into the pressure chamber via the lateral lubricant channel is small so that the provision of spacious reservoirs for the additional lubricant supply can be omitted.
Ultimately, the pressure/temperature regulating means of the inventive apparatus also serves for continuously monitoring the drawing process, because pressure drops in the pressure chamber during the continuous operation of the drawing plant indicate irregularities of the drawing process or of the form-ing stock.
Thus, a method and an apparatus are achieved by means of the invention, for the hydrodynamic draw forming of laminated com-pound wire by means of lubricant-pressurised multi-stage draw-ing plants, with the focus being placed on a safe starting and restarting of the plant without the risk of wire breakage or reduced drawing quality. The method provides for building up a hydrostatic starting pressure in the drawing gap upstream of the wire die of each drawing stage by means of a heated pressure chamber, which acts on the drawing agent and lubric-ant being introduced therein and on the laminated compound wire as well as for a controlled preheating. When defined pressure and temperature ratios are prevailing for all chambers, the drawing operation will be enabled. Therefore, the drawing agent and lubricant is brought into a pasty con-dition in the very beginning so that with the commencement of the drawing movement, hydrodynamic ratios will develop which during the ongoing, continuous drawing process permit an ade-quate lubricant supply in the drawing gap.
In the embodiment of the invention it is checked by the con-tinuous monitoring of pressure and temperature in each pressure chamber when and to what extent a provided separate heating unit is to be deactivated because of the beginning heating in the drawing process. The different heat generation in the respective drawing stages is then taken into consider-ation.
The invention will be explained more detailed in the following with reference to an embodiment and with the aid of figures.
These show:
Figs. la and lb, each, a side view and a plan view of the drawing stage assembly, comprising pre-die and wire die as well as pressure chamber; and Fig. 2 a sectional view of the pressure chamber.
Each of the drawing stages 1 according to Figs. la and lb com-prises a pre-die seat 2, a pressure chamber 3, and a wire die seat 4 with a wire die (not shown). A lubricant box 5 which is known per se and illustrated by broken lines serves for accom-modating the lubricant which in the current drawing operation provides for hydrodynamic pressure ratios in and around the drawing gap.
The laminated compound wire 6 to be formed now enters the pressure chamber 3 via the lubricant box 5, the pre-die seat 2 and subsequently the wire die provided in the wire die seat 4, in order to be subjected therein to the actual stage-by-stage forming.
As can be seen from the plan view according to Fig. lb, the pressure chamber 3 comprises a laterally arranged hydraulic cylinder 12 which in cooperation with the elements shown in Fig. 2 forms a pressure generating means 9. Sensors 17 monitor the position of a pressure plunger not shown in Fig. lb, in order to indirectly detect the pressure ratios in the pressure chamber 3. Furthermore, a wire die cooling unit 16 known per se is provided at the wire die seat 4.
The elements pre-die seat 2, pressure chamber 3, wire die seat 4, as well as pressure generating means 9 form an assembly which is supported by a base plate 18.
The construction of the pressure chamber will now be explained in more detail with reference to the sectional view according to Fig. 2. The pressure chamber 3 comprises a lateral lubric-ant channel 8 which leads to the wire passage 7 of the pressure chamber 3. A hopper-type feeding means 11 serves for the supply of lubricant in the case of starting or restarting of the drawing plant.
A pressure plunger 10 is arranged in the pressure generating means 9 and is actuated by the hydraulic cylinder 12, i.e.
displaced in the direction of the wire passage 7 of the pressure chamber 3. The plunger 10 is guided at least partial-ly in the lateral lubricant channel 8, and builds up the pressure ratios in the pressure chamber, i.e. in the pressure chamber interior of the wire passage 7.
In addition, the pressure chamber 3 has holes 13 for accommo-dating preferably electrical heating elements, as well as a hole 14 which serves for securing a temperature sensor.
5 Mating holes 15 serve for accommodating tension bolts (not shown) in order to ensure a secure, tight force connection between the pressure chamber 3 and the neighbouring pre-die seat 2 or wire die seat 4, respectively.
10 A pressure/temperature regulating means (not shown) in co-operation with the sensors 17 and the temperature sensor arranged in the hole 14 continuously monitors the pressure and temperature ratios of the pressure chambers of all drawing stages, and upon reaching pregiven values, enables starting as well as restarting of the drawing plant. The mentioned regul-ating means is also able to control a wire die cooling unit which is known per se.
With the above described embodiment is it possible to safely form laminated compound wires with high-strength core but soft sheathing material without the occurrence of undesired break-ages or seizure of the forming stock in the wire dies. The pressure chambers to be provided in each drawing stage have an extremely simple construction and, together with pre-die and wire die seats which are known per se, can form a unit with a small installation size so that retrofitting of existing plants does not constitute any problems.
List of reference numerals 1 Drawing stage 2 Pre-die seat 3 Pressure chamber 4 Wire die seat 5 Lubricant box 6 (Laminated) Compound wire 7 Wire passage in the pressure chamber 8 Lateral lubricant channel 9 Pressure generating means 10 Pressure plunger 11 Lubricant feeding means 12 Hydraulic cylinder 13 Hole for electrical heating elements I4 Hole for temperature sensor 15 Mating holes 16 Wire die cooling unit 17 Sensors 18 Base plate
10 A pressure/temperature regulating means (not shown) in co-operation with the sensors 17 and the temperature sensor arranged in the hole 14 continuously monitors the pressure and temperature ratios of the pressure chambers of all drawing stages, and upon reaching pregiven values, enables starting as well as restarting of the drawing plant. The mentioned regul-ating means is also able to control a wire die cooling unit which is known per se.
With the above described embodiment is it possible to safely form laminated compound wires with high-strength core but soft sheathing material without the occurrence of undesired break-ages or seizure of the forming stock in the wire dies. The pressure chambers to be provided in each drawing stage have an extremely simple construction and, together with pre-die and wire die seats which are known per se, can form a unit with a small installation size so that retrofitting of existing plants does not constitute any problems.
List of reference numerals 1 Drawing stage 2 Pre-die seat 3 Pressure chamber 4 Wire die seat 5 Lubricant box 6 (Laminated) Compound wire 7 Wire passage in the pressure chamber 8 Lateral lubricant channel 9 Pressure generating means 10 Pressure plunger 11 Lubricant feeding means 12 Hydraulic cylinder 13 Hole for electrical heating elements I4 Hole for temperature sensor 15 Mating holes 16 Wire die cooling unit 17 Sensors 18 Base plate
Claims (7)
1. A method for the hydrodynamic draw forming of laminated compound wire by means of lubricant-pressurised multi-stage drawing plants using a pressure chamber, characterised in that prior to starting or restarting of the multi-stage drawing plant immediately upstream of the wire die of each drawing stage a hydrostatic starting pressure is built-up in the drawing gap by means of a heated pressure chamber through which the laminated compound wire passes, which acts on the drawing and lubricating agent introduced into same, with the starting pressure for each drawing stage being preset and monitored by a hydraulic controller and the preheating of the pressure chambers to a given temperature taking place, and upon reaching a selectable pressure/temperature range in all stages, the drawing operation is enabled so that laminated compound wires with a high-strength core and a soft sheathing material can be formed in a high quality manner, with hydro-dynamic pressure ratios being built-up in the drawing gap during the ongoing continuous drawing in a manner known per se by carrying along the lubricant.
2. The method according the Claim 1, characterised in that during the drawing operation pressure and temperature in each pressure chamber are continuously monitored, with the separate heating unit being deactivatable upon the beginning of the heating of the wire die(s) by the drawing operation.
3. The method according to one of the previous claims, characterised in that the starting and restarting pressure in the pressure chambers upstream of each drawing stage pressure chamber amounts to essentially 100 to 130 bar.
4. An apparatus for the hydrodynamic draw forming of laminated compound wire by means of lubricant-pressurised multi-stage drawing plants, wherein each drawing stage pressure chamber comprises at least one pre-die and one wire die and a lubricant feeding means is arranged at each pre-die and comprising a pressure chamber, characterised in that between pre-die and wire die a heated pressure chamber (3) is provided which forms a structural unit with these, the pressure chamber (3) comprises a wire passage (7) as well as a lateral lubricant channel (8), in addition a hydraulically operatable pressure generating means (9) is arranged at the pressure chamber (3) in such manner that the lubricant supplied to the lubricant channel (8) via a further lubricant feeding means (11) can be pressed into the wire passage (7) under a predeterminable pressure and in cooperation with the heating means provided in the pressure chamber (3) transforms to a pasty condition and surrounds the laminated compound wire prior to its entry into the respective drawing stage pressure chamber, and that the lateral lubricant channel (8) accommodates a pressure plunger (10) which can be actuated by a hydraulic cylinder (12), with the movement or position of the plunger (10) being able to be monitored by means of sensors (17) for the indirect determination of the pressure ratios.
5. The apparatus according to Claim 4, characterised in that the pressure chamber (3) comprises lateral holes or recesses (13) for accommodating preferably electrical heating elements as well as a hole (14) for a temperature sensor.
6. The apparatus according to Claim 4 or 5, characterised in that the seats (2; 4) of pre-die and wire die as well as the pressure chamber (3) comprise mating holes (15) which extend in the drawing direction for guiding tension and fastening bolts.
7. The apparatus according to one of Claims 4 to 6, characterised by a pressure/temperature regulating means which monitors the pressure and temperature ratios of all pressure chambers of the drawing stage pressure chambers and enables starting as well as restarting of the drawing plant and controls a wire die cooling unit known per se in accordance with predeterminable parameters.
Applications Claiming Priority (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19804016.4 | 1998-02-02 | ||
| DE19804016 | 1998-02-02 | ||
| DE19810342.5 | 1998-03-10 | ||
| DE19810342A DE19810342C2 (en) | 1998-02-02 | 1998-03-10 | Process for hydrodynamic drawing of laminated wire and multiple drawing system |
| PCT/EP1999/000680 WO1999038625A1 (en) | 1998-02-02 | 1999-02-02 | Method and device for the deformation by hydrodynamic drawing of multi-layer composite wire by means of lubricant-supplied multiple drawing machines |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2318831A1 true CA2318831A1 (en) | 1999-08-05 |
Family
ID=26043534
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002318831A Abandoned CA2318831A1 (en) | 1998-02-02 | 1999-02-02 | Method and device for the deformation by hydrodynamic drawing of multi-layer composite wire by means of lubricant-supplied multiple drawing machines |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP1053064B1 (en) |
| JP (1) | JP3326499B2 (en) |
| AT (1) | ATE217218T1 (en) |
| CA (1) | CA2318831A1 (en) |
| WO (1) | WO1999038625A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116984404B (en) * | 2023-07-28 | 2024-04-26 | 浙江创特新材科技有限公司 | Movable multi-section thin tungsten wire heating module and high-strength thin tungsten wire drawing equipment |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3413832A (en) * | 1965-07-27 | 1968-12-03 | Nat Standard Co | Wire drawing method |
| AT353737B (en) * | 1976-09-16 | 1979-11-26 | Langenecker Bertwin Dr | METHOD AND DEVICE FOR DRAWING WIRE, RODS, PIPES AND THE LIKE. |
| EP0013012B1 (en) * | 1978-12-21 | 1984-06-20 | Akademie der Wissenschaften der DDR | Device for applying a lubricant to a metallic plastically deformable part |
| AT383513B (en) * | 1979-08-29 | 1987-07-10 | Uralsky Inst Chernykh Metall | DRAWING PROCEDURE WITH HYDRODYNAMIC LUBRICATION |
| BG41686A1 (en) * | 1984-12-17 | 1987-08-14 | Petkov | Device for drawing of wire |
| ATE181858T1 (en) * | 1994-11-11 | 1999-07-15 | Ecoform Umformtechnik Gmbh | METHOD AND DEVICE FOR FORMING AND/OR COATING STRONG-SHAPED METALLIC FORMING PRODUCT |
-
1999
- 1999-02-02 AT AT99907481T patent/ATE217218T1/en not_active IP Right Cessation
- 1999-02-02 JP JP2000529908A patent/JP3326499B2/en not_active Expired - Fee Related
- 1999-02-02 CA CA002318831A patent/CA2318831A1/en not_active Abandoned
- 1999-02-02 EP EP99907481A patent/EP1053064B1/en not_active Expired - Lifetime
- 1999-02-02 WO PCT/EP1999/000680 patent/WO1999038625A1/en active IP Right Grant
Also Published As
| Publication number | Publication date |
|---|---|
| ATE217218T1 (en) | 2002-05-15 |
| EP1053064A1 (en) | 2000-11-22 |
| JP3326499B2 (en) | 2002-09-24 |
| EP1053064B1 (en) | 2002-05-08 |
| JP2002501827A (en) | 2002-01-22 |
| WO1999038625A1 (en) | 1999-08-05 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Discontinued |