15results about How to "Improve rolling stability" patented technology

The invention relates to a method for forming a GH4169 alloy thin-wall ring piece, which comprises the following steps of: forging two pieces in the height direction in a combined manner, and designing a specific forging drawing, preparing a bar material, manufacturing a blank, rolling, carrying out heat treatment, turning and carrying out flaw detection, for example, designing the small allowance of the outer diameter and the inner diameter of the forging drawing, smelting the bar material in a specific specification by using a triple process, the method has the beneficial effects that the rolling stability is improved, the grain structure is refined, raw materials are saved, the production efficiency is doubled, the flaw detection requirement is met, and the method is suitable for manufacturing related parts in the aerospace field and has wide application prospects and important popularization value.

The utility model provides a rolling mill bearing seat clearance on-line detection device which comprises a sensor, the sensor is installed on a rack lining plate or a bearing seat lining plate, a rolling mill clearance side of the rack lining plate or the bearing seat lining plate is provided with a sensor installation groove, the sensor is installed in the sensor installation groove through a bolt, and the sensor is installed on the rack lining plate or the bearing seat lining plate. A sensor mounting groove is formed in the rack lining plate, a through hole is formed in the sensor mounting groove, a wire groove is formed in the rack side of the rack lining plate or the bearing seat side of the bearing seat lining plate, a communication cable of the sensor penetrates through the through hole and is led out of the wire groove, and the leading-out end of the communication cable is connected to signal acquisition equipment; and the sensor is calibrated before use. The device can work stably for a long time in a severe rolling site, and position information of each roller bearing seat can be monitored on line.

The invention discloses a zirconium alloy cast ingot, a high-quality Zr-Sn-Nb alloy strip for nuclear power and a preparation method and application of the high-quality Zr-Sn-Nb alloy strip. According to the method, a direct hot rolling coiling process of the zirconium alloy large plate blank is adopted, the technical parameters of hot continuous rolling of the large plate blank, namely the plate blank thickness, the hot rolling temperature, the rolling speed and the pass deformation, are mainly controlled, and the key performance such as zirconium alloy corrosion is guaranteed; according to the process, the deformation amount is increased, the basal texture is weakened, the transverse texture is improved, and the structure performance of the finished strip is improved.

The invention belongs to the field of steel coil cold rolling, and relates to a raw material steel coil cold rolling method and device and a storage medium. Performing edge quality grading on the raw material steel coil according to the edge quality morphology; and carrying out cold rolling on the raw material steel coil according to the edge part quality judgment grade. According to the raw material steel coil cold rolling method and device and the storage medium, the problem that when a cold continuous rolling unit rolls a material with the room-temperature brittleness characteristic, due to poor edge quality, a rolled strip is broken is solved, and the purpose of improving the rolling stability of the cold continuous rolling unit is achieved.

The invention belongs to the technical field of steel rolling production control, and particularly relates to a working roll on-line roll shifting method for improving rolling stability, which is characterized in that the axial transverse movement force of working rolls during roll shifting is limited by controlling the roll shifting speed of the working rolls in each rack provided with a working roll shifting system; the control conditions of the roll shifting speed during the roll shifting operation of the working roll are as follows: the ratio # imgabs0 # of the roll shifting speed VS of the working roll in each rack provided with the working roll shifting system to the roll linear speed VR is controlled, and the ratio # imgabs0 # of the roll shifting speed VS of the working roll to the roll linear speed VR of the working roll is controlled according to the rolling force level of the rack on the basis of the ratio # imgabs0 #; the hierarchical level limits the ratio of VS to VR. According to the method, the roll shifting force is controlled within a reasonable range which does not affect rolling production, large-amplitude fluctuation of the roll shifting force is avoided, rapid changes of the roll gap state and the thermal convexity of the rolling mill are avoided, the stability of rolled piece deformation in the roll shifting process is improved, and plate shape defects, strip steel deviation and steel piling accidents caused by roll shifting of the working roll are reduced or avoided.

The utility model provides a rolling and packaging mechanism and a pillow packaging line. The rolling and packaging mechanism comprises a switching assembly, a rolling limiting assembly, a pushing assembly and a rolling assembly. A first rolling limiting cavity and a second rolling limiting cavity are formed in the rolling limiting assembly, the switching assembly is in driving connection with the rolling limiting assembly, the rolling limiting assembly can be switched to a first posture and a second posture under driving of the switching assembly, and the rolling assembly is used for rolling a workpiece in the first rolling limiting cavity or the second rolling limiting cavity. The pushing assembly is used for pushing out the workpieces in the first rolling limiting cavity or the second rolling limiting cavity. Compared with the prior art, the rolling and packaging mechanism can conduct rolling operation and anti-explosion bag sleeving operation at the same time, the production takt is accelerated, and the production efficiency is improved; and the rolling stability can be improved through the two rolling assemblies.

The application discloses a method and system for judging feedback thickness difference abnormality and roll gap processing in a hot rolling process, which comprises the following steps: setting an interval range and an abnormality frequency upper limit; after the strip steel is completed, real-time instrument feedback thickness difference is obtained, whether the instrument feedback thickness difference exceeds the interval range is judged, and the frequency of the real-time instrument feedback thickness difference exceeding the interval range is recorded; when the frequency of the recorded instrument feedback thickness difference exceeding the interval range exceeds the abnormality frequency upper limit, it is determined that the instrument feedback thickness difference abnormality occurs at this time; at this time, the roll gap target value is corrected correspondingly. The application is beneficial to solve the problems of abnormal equipment operation caused by the set abnormality, strip steel rolling and the serious thickness difference detection distortion caused by the serious strip steel wave caused by the abnormality of the instrument detection thickness difference feedback in the rolling process, and has a positive significance for improving the rolling stability.

The invention discloses a forward and backward slip control method for a finishing mill group, which comprises the following steps of: processing the reduction rate of each rack corresponding to strip steel to be subjected to finish rolling to obtain an influence coefficient of the reduction rate on forward slip; the inlet thickness and the roller diameter of each rack corresponding to the strip steel to be subjected to finish rolling are processed, and the influence coefficient of the roller diameter on forward slip is obtained; the influence coefficient of the reduction rate on forward slip and the influence coefficient of the roller diameter on forward slip are processed, and the forward slip coefficient of each rack is obtained; processing the forward slip coefficient of each rack to obtain a backward slip coefficient of each rack; the outlet speed of the finish rolling last rack and the forward slip coefficient and the backward slip coefficient of each rack are processed, and the speed of each rack is obtained; the backward slip coefficient of the finish rolling first rack is corrected; and the corrected backward slip coefficient of the finish rolling first rack is processed, and the inlet speed of the finish rolling first rack and the roller way speed before finish rolling are obtained. The rolling stability between the racks can be improved, and the waist collapse phenomenon of soft steel in front of a finishing mill is avoided.

The microalloyed high-strength steel comprises the following chemical components in percentage by mass: 0.055 to 0.075 percent of C, 0.40 to 1.00 percent of Si, 1.90 to 2.40 percent of Mn, 0.20 to 0.60 percent of Cr, 0.010 to 0.025 percent of Nb, 0.020 to 0.040 percent of Ti, less than or equal to 0.040 percent of P, 0.01 to 0.15 percent of Als, less than or equal to 0.0005 percent of B, less than or equal to 0.006 percent of S, less than or equal to 0.0055 percent of N, less than or equal to 0.006 percent of Ca and the balance of Fe and inevitable impurity elements. The method comprises the following steps: controlling the carbon equivalent CElt; and carrying out smelting, continuous casting and hot rolling on 0.07% of the raw materials. Aiming at the industrial pain and difficulty that corner-cleaning-free hot charging rolling of the microalloyed high-strength steel is not easy to realize, restricting factors are deeply excavated from the sources of component design, a continuous casting process and a hot rolling process, and industrial practice of corner-cleaning-free hot charging rolling of the Nb-Ti microalloyed high-strength steel is realized through integrated design; key indexes including the hot charging rate, the charging temperature, the yield and the yield are very bright.

The present invention provides a method for improving the setting accuracy of the front slip of hot rolling finishing, and belongs to the technical field of hot rolling automatic control. The method comprises: installing a loop encoder on the loop roller, and when the downstream frame bites the steel during steel rolling, the speed of the loop roller during the strip threading is detected by the installed loop encoder; wherein, the detected loop roller speed is used as the strip speed; it is judged whether the detected loop roller speed is valid, and if it is valid, the front slip self-learning is started, and the front slip correction coefficient is periodically calculated according to the strip speed; when the front slip of the next piece of steel is set, the theoretical calculated front slip value is corrected by using the final front slip correction coefficient obtained after the front slip self-learning correction, and the corrected front slip setting value is obtained and sent to the basic automation, and the basic automation calculates the strip speed by the roller speed * the corrected front slip setting value as the benchmark for finishing rolling and coiling speed control and tracking. The present invention can improve the calculation accuracy of the front slip of the rolling mill, thereby improving the rolling stability.

The present invention provides a medium-sized truck cab suspension, including a front suspension assembly and a rear suspension assembly, wherein the rear suspension assembly includes a left rear suspension assembly and a right rear suspension assembly, and left and right rear suspension upper brackets; the front suspension assembly includes left and right front suspension upper bracket assemblies, left and right flip arms, stabilizer bars, shock absorbers, shock absorber lower brackets, and limit blocks. The front and rear suspensions of the present invention both use components such as shock absorbers that can greatly absorb impacts and attenuate vibrations, thereby improving the cab suspension of medium-sized commercial vehicles from the original semi-floating suspension to four-point full floating, which has a good vibration isolation effect, improves the vibration isolation rate of the cab of medium-sized commercial vehicles, and improves driving comfort.

The invention belongs to the technical field of hot-rolled strip steel production control, and particularly relates to a roll shifting method for prolonging the rolling period of working rolls of a hot-rolled strip steel endless rolling finishing mill group, which comprises the following steps of: configuring long-stroke working roll shifting systems for 3-4 finishing mill racks close to the downstream in the finishing mill group; roll shifting is carried out when rolling of every 1-2 coils of strip steel is completed, the initial roll shifting position is close to the limit roll shifting position when casting rolling of the first coil of strip steel is started, a reciprocating roll shifting strategy that one-way roll shifting or roll shifting direction change does not exceed one time is adopted, the single roll shifting step length is controlled not to exceed 10 mm, and the roll shifting speed does not exceed 1.0 mm / s; and the roll shifting position distribution covers the whole roll shifting stroke as much as possible. According to the invention, the abrasion of the roller is obviously dispersed, the abrasion curve tends to be smooth, the local abrasion aggravation phenomenon is weakened or avoided, the axial shifting load is favorably reduced, the plate shape instability, strip steel deviation or steel piling accidents in the roller shifting process are avoided, and the service life of the roller bearing is favorably prolonged.

The invention discloses a control method for effectively improving the hot delivery and hot charging efficiency of a thin-specification pickled plate, which comprises the following steps of: presetting two continuous casting machine division rolling production lines, namely a 2250 production line and a 1780 production line; the molten steel is conveyed to a continuous casting machine for casting, multi-furnace tapping is controlled through single casting, and a plate blank is obtained; the slabs are conveyed to a hot-rolled slab yard, the slab cutting time is dynamically tracked, if it is judged that the slabs can be loaded into a heating furnace within 4 hours, the slabs are firstly stacked in a stacking position in a concentrated mode and loaded into the heating furnace in batches, and if it is judged that the slabs can be loaded into the heating furnace within 4 hours, the slabs are firstly stacked in a slow cooling area in a concentrated mode; and the steel is charged into a heating furnace in batches within 10 hours, and a rolling plan of the steel tapping amount of the plate blank is arranged. The method can increase the charging temperature of the plate blank, shorten the heating time of the plate blank, reduce the fuel input for heating the plate blank and the fuel consumption per ton of steel, improve the rolling stability of the thin plate, reduce the steel scrap frequency and the rolling breaking rate, and reduce the manufacturing cost of the pickled plate.

The present application relates to the field of weathering steel materials, and in particular to a hot-rolled high-strength high-weathering steel and a preparation method and application thereof; the chemical composition of the hot-rolled high-strength high-weathering steel comprises, by mass fraction, C: 0.043% to 0.048%, Si: 0.51% to 0.59%, Mn: 0.61% to 0.68%, P: 0.101% to 0.109%, S: 0.0031% to 0.0038%, Al: 0.071% to 0.079%, Ti: 0.062% to 0.067%, Cu: 0.251% to 0.259%, Cr: 0.84% ​​to 0.89%, N: 0.0031% ~ 0.0034%, the rest is Fe and unavoidable impurities; adopt micro-alloying design with low C content, low Mn content and high Ti content to improve the overall strength of high weathering steel, reduce the deformation resistance during the rolling process, and have good rolling stability. Composite weathering resistance design is carried out for Si, P, Cu and Cr elements to give full play to the contribution of cheap weathering elements such as Si and P to weathering resistance and solid solution strengthening, and Cu is reused to reduce the adverse effects of chromium carbide on weather resistance and toughness, so as to improve the weathering resistance of steel without adding or adding less precious alloy elements.