CN109834143B - Servo following hot roll bending module and method for forming bent pipe with unequal strength structure on line - Google Patents
Servo following hot roll bending module and method for forming bent pipe with unequal strength structure on line Download PDFInfo
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- CN109834143B CN109834143B CN201711214186.0A CN201711214186A CN109834143B CN 109834143 B CN109834143 B CN 109834143B CN 201711214186 A CN201711214186 A CN 201711214186A CN 109834143 B CN109834143 B CN 109834143B
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Abstract
The invention discloses a servo following hot roll bending module and a method for forming a bent pipe with an unequal strength structure on line, wherein the method for forming the bent pipe with the unequal strength structure on line comprises the following steps: a feeding step, guiding a pipe bar to move forward along the production line direction; a heating step, wherein a first partial section of the tube bar is subjected to high-frequency local heating; a hot roll bending step of roll bending the first partial section with a four-roll hot rolling mechanism to form a curvature; an on-line servo following holding step, measuring the curvature of the first partial section by an on-line roller following holding cooling unit, correcting the curvature by a plurality of groups of times of following holding and repeatedly measuring the curvature of the first partial section, so that the curvature precision of the first partial section reaches the product requirement; an on-line servo cooling step, in which the cooling nozzle is used for cooling the first partial section on line to form a first intensity; the technical scheme can control the variation of the phase change curve and the cooling precision of the tube and the bar on line, thereby controlling the variation of different curvatures and unequal strength structures of the tube and the bar.
Description
Technical Field
The invention relates to a servo following hot roll bending module and a method for forming an unequal-strength structure bent pipe on line, in particular to a servo following hot roll bending module capable of forming an unequal-strength and unequal-curvature bent pipe by performing servo following cooling on a bending rate of a hot roll on line and a method for forming an unequal-strength structure bent pipe on line.
Background
At present, the forming technology of the frame pipe fitting mainly comprises hydraulic forming (cold forming) and hot stamping (hot stamping), and the hydraulic forming can process a three-dimensional closed pipe with a special-shaped section for the processing material form, and the hot stamping can only process a three-dimensional plate; in addition, the manufacturing speed of hydroforming is slow, and the manufacturing speed of hot stamping is relatively higher than that of hydroforming; and the strength of the material is as follows: the strength of the material which can be processed by hydraulic forming is-980 MPa, and the hot stamping forming is 1.2-1.5 GPa; and regarding the structural strength, the hydroformed product has medium structural strength of three-dimensional closure, and the hot stamping forming has high strength of three-dimensional shell parts. Comparing the volumes of the two devices, the hydraulic forming device has large volume, the hot stamping device has large volume, and the device is in a high-temperature state during processing; the processing of the two processing technologies consumes energy, the hydraulic forming consumes less energy, and the hot stamping consumes more energy (the high temperature emits outwards); in terms of the processing cost of the die, the hydraulic forming needs to be matched with a large-sized die, so the processing cost of the die is high, and the hot stamping needs to use a large-sized hot stamping die, so the processing cost of the die is also high; finally, the development process is moderate because both hydroforming and hot stamping are mature techniques.
Safety is still an issue that must be considered while the automobile is lightweight. Advanced countries in the world impose mandatory requirements on the safety of vehicle collisions and establish stricter specifications and tests. The trend of light weight and high safety in the global automobile market drives the vigorous development of high-strength steel parts of automobiles. The global automobile components belong to high-degree sales growing regions in North America countries, India, Mexico, east Union countries and the like, the sales volume and the holding volume of automobiles are increased, and the demand of the automobile components is driven to expand. The problem that the accessory factory part industry in the automobile industry faces at present: the production management of multiple general types of products is difficult, specifications of different automobile parts are different, hundreds of different automobile models are available in the market, and each automobile model has different part strength requirements, so that manufacturers are difficult to produce, manufacture and prepare materials. Therefore, the development of technologies for exhibiting different strengths corresponding to different regions (high-strength protection region, secondary strength region, energy absorption region) of the vehicle body under different situations and vehicle types, particularly under the consideration of small amount of diversity, light weight and cost, will contribute to the development of the industry in the field.
Disclosure of Invention
The invention aims to provide a servo following hot roll bending module, which is used for carrying out hot roll bending on a tube and a bar by using a servo hot roll bending unit, correcting the roll bending rate precision of the tube and the bar by using an online roller following and embracing cooling unit, and then carrying out online cooling capable of controlling the cooling rate to form the different-curvature bent tube and bar with unequal strength.
To achieve the above object, the present invention provides a servo following hot roll bending module, comprising: the guiding and conveying unit comprises a feeding roller and a fixed roller and is used for pushing the pipe and the bar to move forward along the production line direction; the servo hot rolling unit comprises a four-roller hot rolling mechanism and a servo controller, wherein each roller can independently move in a telescopic way to change the pressure applied to the pipe and the bar, and the servo controller is electrically coupled with the four-roller hot rolling mechanism; the high-frequency local heating unit is arranged at the feeding front section of the four-roller type hot rolling mechanism and is used for heating the pipe bar; and an on-line roller following and clasping cooling unit, which comprises a programmable controller, a first position sensor electrically coupled with the programmable controller and used for measuring the curvature of the tube bar which is output by the hot rolling of the servo hot rolling unit, a servo following and clasping roller set which is electrically coupled with the programmable controller and used for carrying out a plurality of groups of times of following and clasping on the tube bar advancing along the production line direction, a second position sensor electrically coupled with the programmable controller and used for measuring the curvature of the tube bar which is output after clasping by the servo following and clasping roller set, and a plurality of cooling nozzles electrically coupled with the programmable controller and respectively carrying out on-line cooling on the tube bar which is output after clasping by the servo following and clasping roller set and accords with the curvature standard.
In an implementation aspect, the tube and the rod are hollow tubes, the servo follow-up hot roll bending module further includes a composite through inner mold unit sequentially including a flexible mandrel section, a ceramic mandrel section and a metal mandrel section, the feeding end of the tube and the rod penetrates into the inner diameter of the hollow tube, and the flexible mandrel section corresponds to the roll bending position of the four-roll hot rolling mechanism on the tube and the rod, the ceramic mandrel section corresponds to the heating position of the high-frequency local heating unit on the tube and the rod, and the metal mandrel section corresponds to the pushing position of the feed roller and the fixed roller on the tube and the rod.
In an embodiment, the tube and rod rolled by the servo thermal roll bending unit has a different curvature, the tube and rod rolled and outputted by the servo thermal roll bending unit has a first partial section, the first partial section sequentially includes a first section, a second section and a third section, the servo following holding roller set includes a first roller set, a second roller set, a third roller set and a fourth roller set sequentially disposed along the production line direction, the second position sensor is disposed at the output section of the first roller set, and the cooling nozzles are disposed among the second roller set, the third roller set and the fourth roller set.
The invention also aims to provide a method for forming the unequal-strength structural bent pipe on line by applying the servo following hot roll bending module.
To achieve the above object, the present invention provides a method for forming an on-line bent pipe with an unequal strength structure, comprising the steps of: providing the servo following hot roll bending module; feeding, namely guiding a high-rigidity pipe bar to advance along the production line direction by a guiding and conveying unit; heating a first partial section of the tube and bar to a better formability by a high frequency local heating unit; performing a hot roll bending step of roll bending the first partial section with a four-roll hot rolling mechanism and forming a curvature in the first partial section; performing an online servo following holding step, measuring the curvature of the first partial section which is bent by the roller and passes through the roller in the production line direction by an online roller following holding cooling unit, correcting the curvature by a plurality of groups of times of following holding and repeatedly measuring the curvature of the first partial section, and enabling the curvature precision of the first partial section to reach the product requirement; and performing an in-line servo cooling step, in which the cooling nozzle performs in-line cooling on the first partial section at a first cooling rate, so that the first partial section has a first intensity.
In an embodiment of the above method, the method further includes: heating a second partial section of the tube and bar to a better formability by applying the high-frequency local heating unit at the rear section of the first partial section of the tube and bar; performing roll bending on the second partial section by using the four-roll hot rolling mechanism, and forming a curvature on the second partial section; and measuring the curvature of the second local section which is bent by the roller and passes through the roller in the production line direction by the online roller following and holding cooling unit, and repeatedly carrying out a plurality of groups of following and holding and measuring the curvature of the second local section repeatedly to ensure that the curvature precision of the second local section meets the product requirement, and carrying out online cooling on the second local section by the cooling nozzle at a second cooling rate different from the first cooling rate value to ensure that the second local section forms a second strength.
In one embodiment, the second partial section is adjacent to or spaced apart from the first partial section.
In one aspect, the material of the tube or rod of the first partial section when heated to the preferred formability is austenite, and the material of the tube or rod of the first partial section when cooled to the first strength is martensite.
In one aspect, the material of the tube or rod of the second partial section when heated to the preferred formability is austenitic, and the material of the tube or rod of the second partial section when cooled to the second strength is martensitic.
In one embodiment, the first partial section of the pipe rod comprises first to third adjacent sections, the first to third sections have first to third predetermined ideal curvatures respectively, the first position sensor measures the first to third sections of the pipe rod rolled by the four-roll hot rolling mechanism to have first to third original curvatures respectively, and inputs the measured curvatures into the programmable controller; the programmable controller of the online roller following clasping cooling unit controls the first roller set to respectively adjust and clasp the first section according to the difference value of the first ideal curvature and the first original curvature, adjust and clasp the second section according to the difference value of the second ideal curvature and the second original curvature, and adjust and clasp the third section according to the difference value of the third ideal curvature and the third original curvature; the second position sensor respectively measures the curvatures output by the servo following holding roller group after the pipe bars in the first to third sections are adjusted and held, and inputs the measured curvatures to the programmable controller; respectively controlling the holding curvature positions of the first to third sections of the tube and bar pushed by the second roller set pair to follow the first roller set, controlling the holding curvature positions of the first to third sections of the tube and bar pushed by the third roller set pair to follow the second roller set and controlling the holding curvature positions of the first to third sections of the tube and bar pushed by the fourth roller set pair to follow the third roller set by the programmable controller; and repeatedly measuring the curvature of the tube and bar material of the first to third sections adjusted by the servo following holding roller set, and comparing the curvature with the corresponding first to third ideal curvatures until the comparison value meets an allowable error.
The invention is characterized in that: according to the invention, the servo following hot roll bending module is adopted to control the phase change curve and the cooling precision variation of the tube and the bar on line, so that the unequal strength display (the material strength of the manufactured product is 900-1500MPa) can be directly achieved on line in production. The pipe and bar can be subjected to thermal mechanical treatment locally or wholly, and the change of different curvature radiuses is controlled by the servo following holding roller set of the online roller following holding cooling unit, so that the requirements of different curvature changes of parts are met, and the advantages of short development time and quick manufacturing process are achieved. The method can be used for forming the bent pipe with different curvatures and unequal strength structures on line by using a material (manganese boron steel) and the key process technology of the online servo tracking hot-rolling bending module under the conditions of different situations and vehicle types, light weight and cost, so that different structural strengths and dimensional specifications of different areas (a high-strength protection area, a secondary strength area and an energy absorption area) of the vehicle body are achieved, and the method is helpful for the production form of the automobile component industry.
Drawings
Fig. 1 is a schematic plan view of a servo follow-up hot roll bending module according to an embodiment of the present invention, wherein the servo follow-up hot roll bending module is a guide conveying unit and a servo hot roll bending unit for performing hot roll bending;
FIG. 2 is a schematic plan view of the guiding and conveying unit, the servo thermal roll bending unit, the high frequency local heating unit and the on-line roller following and holding cooling unit of the servo follow-up thermal roll bending module of FIG. 1;
FIG. 3 is a flowchart illustrating the steps of a method for forming bends having different curvatures and different strengths on-line in accordance with one embodiment of the present invention;
FIG. 4 is a schematic plan view of a servo-actuated, thermal follow-up roll bending module of an embodiment of the present invention performing a second partial section process of different strength on a tube or bar material after the first partial section process to form a tube or bar material of a first strength;
FIG. 5 is a flowchart illustrating the steps of a method for forming two bends with different curvatures and different strengths on-line according to an embodiment of the present invention.
Symbolic illustration in the drawings:
1, servo following a hot roll bending module; 11 a guide conveying unit; 111 a feed roll; 112 fixing the roller; 12 a servo thermal bending unit; 121 a four high hot rolling mechanism; 122 a servo controller; 13 high frequency local heating unit; 14, an online roller following and clasping cooling unit; 141 a programmable controller; 142 a first position sensor; 143 servo following holding roller group; 1431 a first roller set; 14311 output section; 1432 a second roller set; 1433 a third roller set; 1434 a fourth roller set; 144 a second position sensor; 145 cooling the nozzle; 15 composite type core-through inner mold unit; 151 flexible mandrel segments; 152 a ceramic mandrel segment; 153 metal mandrel segments; 2, tubes and bars; 20 inner diameter; 21 a first partial paragraph; 211 a first section; 212 a second section; 213 a third section; 221 a first ideal curvature; 222 a second desired curvature; 223 a third desired curvature; 231 a first original curvature; 232 a second original curvature; 233 third original curvature; 24 a second partial paragraph; S10-S60 are used for forming the bent pipe with the different curvature and the different strength structure on line; and S70-S100, forming a plurality of bent pipes with different curvatures and different strength structures on line.
Detailed Description
The embodiments of the present invention will be described in detail with reference to the accompanying drawings, which are simplified schematic drawings only for illustrating the basic structure of the invention, and therefore, only the components related to the invention are shown in the drawings, and the components are not drawn with the number, shape, size ratio, etc. in the implementation, the specification and the size in the actual implementation are actually a selective design, and the layout of the components may be more complicated.
First, please refer to fig. 1 and fig. 2. The servo following hot roll bending module 1 of the present embodiment adopts a multi-station architecture, so that the metal tube bar 2 is conveyed along a production line direction to be processed sequentially, and the servo following hot roll bending module 1 includes: a guide conveying unit 11, a servo heat bending unit 12, a high frequency local heating unit 13 and an on-line roll following holding cooling unit 14. A guiding and transmitting unit 11, including a feeding roller 111 and a fixing roller 112, for clamping and pushing the tube/rod 2 by the feeding roller 111, and maintaining the tube/rod 2 to be pushed by the fixing roller 112 to move forward along the production line direction; a servo hot rolling unit 12, including a four-roll hot rolling mechanism 121 for making each roll move independently and telescopically to change the pressure applied to the tube or bar 2, and a servo controller 122 electrically coupled to the four-roll hot rolling mechanism 121, wherein the four-roll hot rolling mechanism 121 receives the tube or bar 2 pushed out of the guiding and conveying unit 11 and performs roll bending (capable of performing bending with the same curvature or different curvatures) with a preset desired curvature; a high frequency local heating unit 13 disposed at the feeding front section of the four-roll hot rolling mechanism 121 (preferably located in the production line direction between the four-roll hot rolling mechanism 121 and the guiding and conveying unit 11) for rapidly heating the tube or rod 2; the online roll-following-clasping cooling unit 14 comprises a programmable controller 141, a first position sensor 142 electrically coupled to the programmable controller 141 for measuring the curvature of the tube or rod 2 hot rolled by the servo hot roll bending unit 12, a plurality of sets of servo-following-clasping roll sets 143 electrically coupled to the programmable controller 141 for performing a plurality of sets of multi-clasping operations on the tube or rod 2 advancing in the production line direction, a second position sensor 144 electrically coupled to the programmable controller 141 for measuring the curvature of the tube or rod 2 clasped by the servo-following-clasping roll sets 143, and a plurality of cooling nozzles 145 electrically coupled to the programmable controller 141 for performing online cooling on the tube or rod 2 clasped by the servo-following-clasping roll sets 143 and outputting the tube or rod 2 conforming to the curvature standard (i.e., approaching the ideal curvature). The servo following holding roller set 143 can also be applied to the four-roll hot rolling mechanism 121, but is not limited to single-roll or multi-roll.
Referring to fig. 2 again, in an embodiment where the bar 2 is a hollow tube, the servo-follow hot roll bending module 1 further includes a composite through-core inner mold unit 15, which comprises a flexible mandrel segment 151 for flexibly supporting the tube wall, a ceramic mandrel segment 152 for supporting the tube wall in a high heat manner, and a metal mandrel segment 153 for supporting the tube wall in a high strength external force manner, the composite type inner piercing mold unit 15 is inserted into the inner diameter 20 of the tube rod 2 of the hollow tube body from the feeding end of the tube rod 2, the flexible mandrel segment 151 corresponds to the roll bending position of the four-roll hot rolling mechanism 121 on the tube and bar 2, the ceramic mandrel segment 152 corresponds to the heating position of the high frequency local heating unit 13 on the tube and bar 2, and the metal mandrel segment 153 corresponds to the clamping and pushing position of the feed rollers 111 and the fixed rollers 112 on the tube and bar 2.
In an embodiment, the tube or bar 2 hot-rolled by the servo thermal bending unit 12 is a first partial section 21, the first partial section 21 sequentially includes a first section 211, a second section 212 and a third section 213, the servo tracking clasping roller set 143 includes a first roller set 1431, a second roller set 1432, a third roller set 1433 and a fourth roller set 1434 sequentially disposed along the production line direction, the second position sensor 144 is disposed at the output section 14311 of the first roller set 1431, and the cooling nozzles 145 are disposed between the second roller set 1432, the third roller set 1433 and the fourth roller set 1434.
Please refer to fig. 3. The method for forming the unequal-strength structure bent pipe on line in the embodiment comprises the following steps of:
step S10, providing the servo following hot roll bending module 1 of the implementation mode;
performing a feeding step (step S20) of guiding a high-rigidity tube or bar 2 to advance along the production line by the guiding and conveying unit 11;
performing a first partial-segment heating step (step S30), heating a first partial segment 21 of the pipe or rod 2 by the high-frequency local heating unit 13 to a better formability (e.g. the material crystal phase of the pipe or rod 2 is austempered);
a first partial-section hot roll bending step (step S40) of roll bending the first partial section 21 by the four-roll hot rolling mechanism 121 according to a predetermined desired curvature and forming a curvature in the first partial section 21; (step S50) a first partial section online servo following holding step of measuring the curvature of the first partial section 21 passing through the roll bending and proceeding along the production line direction by the online roll following holding cooling unit 14, and correcting the curvature (i.e. correcting the difference between the actual roll bending curvature and the ideal curvature) by multiple sets of follow holding and repeatedly measuring the curvature of the first partial section 21, so that the accuracy of the curvature of the first partial section 21 can meet the product requirement;
a first partial section online servo cooling step (step S60) of cooling the first partial section 21 meeting the product curvature accuracy requirement online at a first cooling rate by the cooling nozzle 145 to form the first partial section 21 with a first strength (e.g. the material crystal phase of the bar/tube 2 is martensite). Thus, the pipe bar 2 has two different strengths of the original pipe strength and the first strength.
In one embodiment, as shown in fig. 4 and 5. After the first partial section 21 for forming the first strength of the tube or bar 2 is completed, the following steps may be further performed:
a second partial-segment heating step (step S70) of heating a second partial segment 24 of the pipe or rod 2 to a better formability (e.g., austenite phase of the material of the pipe or rod 2) by using the high-frequency local heating unit 13 at a later stage of the first partial segment 21 of the pipe or rod 2;
a second partial section hot roll bending step (step S80) of roll bending the second partial section 24 by the four-roll hot rolling mechanism 121 to form a curvature in the second partial section 24;
a second partial section online servo following holding step (step S90) of measuring the curvature of the second partial section 24 passing through the roll bending and advancing along the production line direction by the online roll following holding cooling unit 14, and repeatedly holding and measuring the curvature of the second partial section 24 in multiple sets of following holding so that the curvature accuracy can meet the product requirement;
a second partial section online servo cooling step (step S100) for online cooling the second partial section 24 meeting the product curvature accuracy requirement by the cooling nozzle 145 at a second cooling rate different from the first cooling rate, so as to form the second partial section 24 with a second strength (e.g. the material crystal phase of the tube/rod material 2 is martensite). Of course, the second intensity may be different from the second intensity.
In addition, in one embodiment, the second partial section 24 may be adjacent to the first partial section 21 or spaced apart from the first partial section 21.
Referring to fig. 2 and 3, in further detail, the first partial section 21 of the pipe bar 2 includes a first section 211, a second section 212 and a third section 213 adjacent to each other, the first to third sections (211,212,213) have a first ideal curvature 221, a second ideal curvature 222 and a third ideal curvature 223, respectively, the first position sensor 142 measures the curvatures of the first to third sections (211,212,213) of the pipe bar 2 rolled by the four-roll hot rolling mechanism 121 as a first original curvature 231, a second original curvature 232 and a third original curvature 233, respectively, and the first position sensor 142 inputs the measured curvatures into the programmable controller 141;
the programmable controller 141 controls the first roller set 1431 to adjust and clamp the first segment 211 according to the difference between the first ideal curvature 221 and the first original curvature 231, adjust and clamp the second segment 212 according to the difference between the second ideal curvature 222 and the second original curvature 232, and adjust and clamp the third segment 213 according to the difference between the third ideal curvature 223 and the third original curvature 233;
the second position sensor 144 measures the curvature of the tube or rod 2 in the first to third sections (211,212,213) after being adjusted and held by the servo tracking holding roller set 143, and inputs the measured curvature to the programmable controller 141;
the programmable controller 141 controls the second roller set 1432 to follow the first roller set 1431 with respect to the holding curvature position of the first to third sections (211,212,213) of the pushed bar 2, controls the third roller set 1433 to follow the second roller set 1432 with respect to the holding curvature position of the first to third sections (211,212,213) of the pushed bar 2, and controls the fourth roller set 1434 to follow the third roller set 1433 with respect to the holding curvature position of the first to third sections (211,212,213) of the pushed bar 2;
the curvature of the tube or rod 2 in the first to third sections (211,212,213) adjusted by the servo tracking and clasping roller set 143 is repeatedly measured and compared with the corresponding first to third ideal curvatures (221,222,223) until the difference value of the comparison meets an allowable error, and then the processing of the first partial section 21 is completed, otherwise, the step of adjusting the tracking and clasping of the on-line roller tracking and clasping cooling unit 14 is repeated.
The above-described embodiments are merely illustrative of the principles, features and effects of the present invention, and are not intended to limit the scope of the invention, which can be modified and varied by those skilled in the art without departing from the spirit and scope of the invention. Any equivalent changes and modifications made by the present disclosure should be covered by the appended claims. Therefore, the protection scope of the present invention should be as set forth in the claims.
Claims (10)
1. A servo-tracking hot roll bending module for sequentially processing a metal tube and bar along a production line direction in a multi-station structure, the servo-tracking hot roll bending module comprising:
the guiding and conveying unit comprises a feeding roller and a fixed roller and is used for pushing the pipe rod materials to advance along the production line direction;
a servo hot rolling unit, wherein the servo hot rolling unit comprises a four-roller hot rolling mechanism and a servo controller, the four-roller hot rolling mechanism enables each roller to independently stretch and move so as to change the pressure applied to the pipe and the bar, the servo controller is electrically coupled with the four-roller hot rolling mechanism, and the four-roller hot rolling mechanism receives the pipe and the bar pushed out of the guide conveying unit and performs roll bending;
the high-frequency local heating unit is arranged at the feeding front section of the four-roller hot rolling mechanism and is used for heating the pipe and the bar; and
the online roller following and holding cooling unit comprises a programmable controller, a first position sensor electrically coupled with the programmable controller and used for measuring the curvature of the tube and bar which is output by the servo hot roll bending unit in a hot rolling mode, a servo following and holding roller set which is electrically coupled with the programmable controller and used for carrying out multi-group multi-following and holding on the tube and bar advancing along the production line direction, a second position sensor electrically coupled with the programmable controller and used for measuring the curvature of the tube and bar which is output after being held by the servo following and holding roller set, and a plurality of cooling nozzles which are electrically coupled with the programmable controller and respectively carry out online cooling on the tube and bar which is output after being held by the servo following and holding roller set and meeting the curvature standard.
2. The servo follow-up hot roll bending module of claim 1, wherein the tube or bar is a hollow tube, the servo follow-up hot roll bending module further comprises a composite through-core inner die unit, the composite through-core inner die unit comprises a flexible mandrel section, a ceramic mandrel section and a metal mandrel section in sequence, the flexible mandrel section penetrates into the inner diameter of the hollow tube from the feeding end of the tube or bar, and the flexible mandrel section corresponds to the roll bending position of the four-roll hot rolling mechanism on the tube or bar, the ceramic mandrel section corresponds to the heating position of the high-frequency local heating unit on the tube or bar, and the metal mandrel section corresponds to the pushing position of the feed roll and the fixed roll on the tube or bar.
3. A servo-actuated follow-up hot roll bending module as claimed in claim 1 or 2, wherein the tube rod material being roll-bent by the servo hot roll bending unit is of a different curvature.
4. The servo-actuated follow-up hot roll bending module of claim 3, wherein the tube material hot rolled by the servo hot roll bending unit is a first partial section comprising a first segment, a second segment and a third segment in sequence, the servo follow-up pinch roller set comprises a first roller set, a second roller set, a third roller set and a fourth roller set in sequence along the production line direction, the second position sensor is disposed at the output segment of the first roller set, and the plurality of cooling nozzles are disposed between the second roller set, the third roller set and the fourth roller set.
5. A method for forming a bend pipe with unequal strength structure on line, comprising the steps of:
providing a servo-follow hot roll bending module according to claim 4;
a feeding step, guiding a rigid pipe bar to move forward along the production line direction by a guide conveying unit;
a first partial section heating step of heating a first partial section of the pipe bar to formability by a high-frequency partial heating unit;
a first partial section hot roll bending step of roll bending the first partial section with a four-roll hot rolling mechanism and forming a curvature in the first partial section;
a first partial paragraph online servo following holding step, measuring the curvature of the first partial paragraph passing through the roll bending and advancing along the production line direction by an online roller following holding cooling unit, correcting the curvature by a plurality of groups of times of following holding and repeatedly measuring the curvature of the first partial paragraph, and enabling the curvature precision of the first partial paragraph to reach the product requirement; and
the first partial section on-line servo cooling step is used for cooling the first partial section which meets the requirement of the product curvature precision on line by a cooling nozzle at a first cooling rate, so that the first partial section is formed into a first strength.
6. The method of forming an unequal strength structural bend in-line according to claim 5 further comprising:
a second partial section heating step of heating a second partial section of the pipe bar to formability by using the high-frequency local heating unit at a rear section of the first partial section of the pipe bar;
a second partial section hot roll bending step of roll bending the second partial section with the four-roll hot rolling mechanism and forming a curvature in the second partial section;
a second local paragraph online servo following holding step, measuring the curvature of the second local paragraph which is bent by the roller and passes through along the production line direction by using the online roller following holding cooling unit, and repeatedly carrying out a plurality of groups of times of following holding and measuring the curvature of the second local paragraph to ensure that the curvature precision of the second local paragraph meets the product requirement; and
and a second partial section online servo cooling step, in which the second partial section meeting the product curvature accuracy requirement is cooled online by the cooling nozzle at a second cooling rate different from the first cooling rate value, so that the second partial section is formed with a second intensity.
7. The method of forming an isostrength structural bend in-line of claim 6 wherein the second partial segment is adjacent to or spaced a distance from the first partial segment.
8. The method of forming an isopipe according to claim 5, wherein the material phase of the pipe or rod material being heated to the formability in the first partial section is austenite, and wherein the material phase of the pipe or rod material being cooled to the first strength in the first partial section is martensite.
9. The method of forming an isopipe of claim 6 wherein the material phase of the pipe and rod material during the heating to the formability in the second partial section is austenite, and wherein the material phase of the pipe and rod material during the cooling to the second strength in the second partial section is martensite.
10. The method of forming an unequal strength structural bend according to claim 5 wherein the first partial section of the pipe bar comprises first to third adjacent sections, respectively, the first to third sections having a predetermined desired curvature, respectively, first to third desired curvatures, the first position sensor measuring the first to third sections of the pipe bar rolled by the four high rolling mechanism as first to third original curvatures, respectively, and inputting the measured first to third original curvatures into the programmer;
the programmable controller controls a first roller set to adjust and hold the first section according to the difference value of the first ideal curvature and the first original curvature, adjust and hold the second section according to the difference value of the second ideal curvature and the second original curvature, and adjust and hold the third section according to the difference value of the third ideal curvature and the third original curvature;
the second position sensor respectively measures the curvatures output by the servo following holding roller group after the pipe bars in the first to third sections are adjusted and held, and inputs the measured curvatures to the programmable controller;
respectively controlling the holding curvature positions of the first to third sections of the pipe rod pushed by a second roller set pair to follow the first roller set, controlling the holding curvature positions of the first to third sections of the pipe rod pushed by a third roller set pair to follow the second roller set, and controlling the holding curvature positions of the first to third sections of the pipe rod pushed by a fourth roller set pair to follow the third roller set by the programmable controller; and
and repeatedly measuring the curvatures of the tube and bar materials of the first section, the second section and the third section which are adjusted by the servo following holding roller set, and comparing the curvatures with the corresponding first ideal curvature, the second ideal curvature and the third ideal curvature until the difference value of the comparison accords with an allowable error.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711214186.0A CN109834143B (en) | 2017-11-28 | 2017-11-28 | Servo following hot roll bending module and method for forming bent pipe with unequal strength structure on line |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711214186.0A CN109834143B (en) | 2017-11-28 | 2017-11-28 | Servo following hot roll bending module and method for forming bent pipe with unequal strength structure on line |
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| Publication Number | Publication Date |
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| CN109834143A CN109834143A (en) | 2019-06-04 |
| CN109834143B true CN109834143B (en) | 2020-09-08 |
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