{"id":7185,"date":"2023-03-28T11:16:29","date_gmt":"2023-03-28T03:16:29","guid":{"rendered":"https:\/\/lmmrolls.com\/?p=7185"},"modified":"2023-03-28T11:20:01","modified_gmt":"2023-03-28T03:20:01","slug":"causes-and-treatment-of-piled-steel-in-the-rolling-process-of-high-speed-wire-rod","status":"publish","type":"post","link":"https:\/\/lmmrolls.com\/hi\/causes-and-treatment-of-piled-steel-in-the-rolling-process-of-high-speed-wire-rod\/","title":{"rendered":"Causes and treatment of piled steel in the rolling process of high-speed wire rod"},"content":{"rendered":"

Kata kunci<\/strong>: high-speed wire rod process<\/p>\n\n\n\n

Keterangan<\/strong>: Due to the fast rolling speed and small section size of small-size wire rod products, steel stacking accidents often occur. This paper introduces the reasons and solutions according to the classification of different rolling areas.<\/p>\n\n\n\n

\"Causes<\/figure>\n\n\n\n

The production line of China SHOUGANG No. 1 Wire Rod Factory, the maximum stable rolling speed of this production line is 88m\/s. The whole line is composed of 28 rolling mills, including 14 roughing and intermediate rolling mills, 4 pre-finishing rolling mills, which are arranged alternately horizontally and vertically, and the 10 finishing mills are arranged at 45\u00b0 from top to bottom. Sending roll and laying machine. The product specification is \u03c65.5\u2014\u03c616mm, the specification span is relatively large, and the varieties produced at the same time are relatively wide. Judging from the current production situation, due to the fast rolling speed and small cross-sectional size of small-sized wire products below \u03c66.5mm (including 6.5mm), the accident rate of steel stacking is far higher than that of other specifications. This paper introduces the reasons and solutions according to the classification of different rolling areas.<\/p>\n\n\n\n

Rough and medium rolling area (1-14 racks)<\/strong><\/h3>\n\n\n\n

The rolled piece cannot be smoothly bitten into the next sortie, resulting in stacked steel <\/strong><\/h4>\n\n\n\n

The main causes of such accidents are:<\/strong><\/p>\n\n\n\n

\u2460 The front of the rolled piece is tilted after coming out of the previous sortie;<\/p>\n\n\n\n

\u2461 The inverted steel at the rear of the previous one pulls up the exit guide; \u2462 The adjustment of the opening of the entrance guide is not appropriate;<\/p>\n\n\n\n

\u2463 Misalignment between guide and pass (rolling line is not correct);<\/p>\n\n\n\n

\u2464 Slot slipping;<\/p>\n\n\n\n

\u2465The size of the rolled piece does not meet the process requirements;<\/p>\n\n\n\n

\u2466 Front splitting caused by billet.<\/p>\n\n\n\n

Langkah-langkah penanganan:<\/strong><\/p>\n\n\n\n

\u2460 Check the diameter and wear of the upper and lower rolls, the gap between the joints of the transmission parts, and the consistency of the height of the import and export guides for the warped head of the rolled piece;<\/p>\n\n\n\n

\u2461Reasonably adjust the entrance opening and the distance between the guide and the roller;<\/p>\n\n\n\n

\u2462 The roll gap setting of the newly replaced slot hole is too small, and the roll gap of the rolling mill should be adjusted properly or the slot hole should be re-grinded;<\/p>\n\n\n\n

\u2463 Properly adjust the roll gap of the rolling mill;<\/p>\n\n\n\n

\u2464 Check the blank carefully, and lengthen the length of the cutting head with 1# shear.<\/p>\n\n\n\n

2.1.2 Stacked steel between the racks after the rolled piece bites<\/strong><\/h4>\n\n\n\n

alasan utama:<\/strong><\/p>\n\n\n\n

\u2460Incorrect setting of parameters such as rolling speed and \u092e\u093f\u0932 \u0930\u094b\u0932<\/a> diameter caused by human factors;<\/p>\n\n\n\n

\u2461 Improper adjustment of stacking relationship after changing rolls or slots;<\/p>\n\n\n\n

\u2462 billet temperature fluctuates too much;<\/p>\n\n\n\n

\u2463Sudden speed up or down of a rolling mill caused by electronic control;<\/p>\n\n\n\n

\u2464 The operator of the main console adjusts the wrong number of revolutions or shifts when adjusting the rotational speed of the rolling mill;<\/p>\n\n\n\n

Langkah-langkah penanganan:<\/strong><\/p>\n\n\n\n

\u2460 Correctly set the rolling speed and roll diameter, and reasonably adjust the stacking relationship between rolling mills. Do a good job of confirmation between the two;<\/p>\n\n\n\n

\u2461 Notify the heating furnace operator to adjust the fire, and at the same time keep warm and wait for rolling;<\/p>\n\n\n\n

\u2462Electrical professional inspection, empty the spare cabinet.<\/p>\n\n\n\n

Grup LMM \u092e\u093f\u0932 \u0930\u094b\u0932<\/a> are made of high-quality materials, have a flawless surface finish, have appropriate hardness and are manufactured according to precise size specifications to meet the rolling characteristics and technical requirements of various rolling mills.<\/em><\/p>\n\n\n\n

\"Classification<\/figure>\n\n\n\n

2.1.3 Tail stack steel after rolling (<\/strong><\/h4>\n\n\n\n

The main reason<\/strong> is that at the upstream frame, when the rolled piece draws steel to cause the rear tail to break away from the upstream frame, the steel is piled up in the downstream frame.<\/p>\n\n\n\n

Langkah-langkah penanganan: <\/strong>Reasonably adjust the stacking relationship and the size of the rolling mill.<\/p>\n\n\n\n

2.2 Pre-finishing area (15-18 stands)<\/strong><\/h3>\n\n\n\n

2.2.1 Stacking steel between racks <\/strong><\/h4>\n\n\n\n

alasan utama:<\/strong><\/p>\n\n\n\n

\u2460Incorrect setting of roll gap, roll diameter, rolling speed and other parameters;<\/p>\n\n\n\n

\u2461Guide installation is not suitable;<\/p>\n\n\n\n

\u2462Guard strikes iron;<\/p>\n\n\n\n

\u2463Coarse and medium rolling and drawing steel cause the rolled piece to be tailed after pre-finishing rolling;<\/p>\n\n\n\n

\u2464 Abnormal rotation speed of a certain rolling mill due to electronic control.<\/p>\n\n\n\n

Langkah-langkah penanganan:<\/strong><\/p>\n\n\n\n

\u2460 Check the setting parameters again;<\/p>\n\n\n\n

\u2461 Check and replace or adjust the import and export guides;<\/p>\n\n\n\n

\u2462 Adjust the height of the pre-finishing inner looper and strengthen inspection;<\/p>\n\n\n\n

\u2463Reasonably adjust the stacking relationship of the continuous rolling mill;<\/p>\n\n\n\n

\u2464Electrical professional inspection at the same time dump the spare cabinet.<\/p>\n\n\n\n

2.2.2 A certain shift of pre-finish rolling<\/strong><\/h4>\n\n\n\n

alasan utama:<\/strong><\/p>\n\n\n\n

\u2460Pre-finishing cooling water pressure and lubrication system failure;<\/p>\n\n\n\n

\u2461 Motor tripping;<\/p>\n\n\n\n

\u2462 The role of the accident detection system.<\/p>\n\n\n\n

Langkah-langkah penanganan:<\/strong><\/p>\n\n\n\n

\u2460 Check the cooling water pressure and the control water valve beside the machine;<\/p>\n\n\n\n

\u2461 Equipment professional inspection lubrication system;<\/p>\n\n\n\n

\u2462 Check whether the pre-finishing fishing line pendant is fastened, and check its proximity switch at the same time.<\/p>\n\n\n\n

2.3 High-speed area (finishing mill to laying head) <\/strong><\/h3>\n\n\n\n

2.3.1 Steel stacking between racks in the finishing mill <\/strong><\/h4>\n\n\n\n

alasan utama:<\/strong><\/p>\n\n\n\n

\u2460 The guide wheel does not rotate or the bearing burns;<\/p>\n\n\n\n

\u2461Rolled piece start;<\/p>\n\n\n\n

\u2462Wrong installation of guide guard or roller ring;<\/p>\n\n\n\n

\u2463 Improper roll gap setting or inappropriate incoming material size;<\/p>\n\n\n\n

\u2464The roller ring is broken; \u2465The fishing line is broken and the rolling line is automatically broken.<\/p>\n\n\n\n

Langkah-langkah penanganan:<\/strong><\/p>\n\n\n\n

\u2460 Replace the guide and guard, and at the same time strengthen the correctness of guide and guard installation;<\/p>\n\n\n\n

\u2461Strengthen blank inspection and lengthen the length of cutting head;<\/p>\n\n\n\n

\u2462Recheck and adjust the roll gap;<\/p>\n\n\n\n

\u2463Replace the roller ring and check the cooling water pipe at the same time.<\/p>\n\n\n\n

\u2464 Check the proximity switch at the pendant of the fishing line, and check whether there is scrap steel at the guide in the finishing mill. If there is, it means that the rear end of the previous one is stacking steel in the finishing mill, and reset the roll gap in the finishing mill.<\/p>\n\n\n\n

2.3.2 Steel stacking at the scrap box of the finishing mill <\/strong><\/h4>\n\n\n\n

Divided into two situations, one is to pile up steel without spinning, and the other is to pile up steel after spinning several circles.<\/p>\n\n\n\n

Alasan-alasan utamanya adalah:<\/strong><\/p>\n\n\n\n

\u2460 The cooling water in the water cooling section cannot be closed normally or opened too early;<\/p>\n\n\n\n

\u2461 There are foreign objects in the water cooling section;<\/p>\n\n\n\n

\u2462Water-cooling channel installation dislocation;<\/p>\n\n\n\n

\u2463 After the finishing mill, the water valve of the first section of the water cooling box is too large or the water pressure is too large;<\/p>\n\n\n\n

\u2464 The speed matching between the finishing mill, pinch roll and laying machine is not good;<\/p>\n\n\n\n

Langkah-langkah penanganan:<\/strong><\/p>\n\n\n\n

\u2460 The electric control professional checks the water valve control system and manually tests the water, and the main console adjusts the opening delay;<\/p>\n\n\n\n

\u2461 Check whether the water-cooling nozzle and guide groove are installed correctly and whether there is any looseness, and check whether there is any foreign matter in it at the same time, and use a \u03c613mm round steel to penetrate the water-cooling section;<\/p>\n\n\n\n

\u2462 Check the speed matching between the three;<\/p>\n\n\n\n

\u2463 The specifications of the water-cooling nozzle and guide groove can be enlarged, such as replacing \u03c612mm with \u03c616mm.<\/p>\n\n\n\n

2.3.3 Pile of steel at pinch roll laying head <\/strong><\/h4>\n\n\n\n

alasan utama:<\/strong><\/p>\n\n\n\n

\u2460Incorrect installation of the inlet and outlet conduits of the pinch roller, severe wear or foreign matter in the conduit;<\/p>\n\n\n\n

\u2461The detection signal before the pinch roller fails, so that the pinch roller cannot be opened\/closed on time;<\/p>\n\n\n\n

\u2462The spinning tube is severely worn;<\/p>\n\n\n\n

\u2463 Tail clamping delay setting is too short, resulting in tail loss;<\/p>\n\n\n\n

\u2464 The speed mismatch between the finishing mill and the laying machine;<\/p>\n\n\n\n

\u2465 Internal quality defects (smelting defects) or rolling defects (severe folds or ears) of wire rods cause stacked steel.<\/p>\n\n\n\n

Langkah-langkah penanganan:<\/strong><\/p>\n\n\n\n

\u2460 Check and replace the inlet and outlet conduits;<\/p>\n\n\n\n

\u2461Electrical professional inspection detection signal;<\/p>\n\n\n\n

\u2462Replace the spinning tube;<\/p>\n\n\n\n

\u2463 Lengthen the pinch delay;<\/p>\n\n\n\n

\u2464 Reasonably set the speed matching between the finishing mill and the laying machine;<\/p>\n\n\n\n

2.4 Heap steel at the flying shear <\/strong><\/h3>\n\n\n\n

alasan utama:<\/strong><\/p>\n\n\n\n

\u2460The shearing speed of the flying shear does not match the speed of the upstream rolling mill, and there is a bend at the front and back of the cutting, resulting in stacked steel;<\/p>\n\n\n\n

\u2461 The length of the rear tail of the flying shear is too short, resulting in the rear tail not being completely cut off and brought into the next rolling mill;<\/p>\n\n\n\n

\u2462Severe wear of the cutting edge and switch causes the cutting position to be incorrect;<\/p>\n\n\n\n

\u2463 Flying shears malfunction midway, cutting out of control.<\/p>\n\n\n\n

Langkah-langkah penanganan:<\/strong><\/p>\n\n\n\n

\u2460Reset the leading coefficient of the flying shear;<\/p>\n\n\n\n

\u2461Adjust the length of cutting head and tail;<\/p>\n\n\n\n

\u2462 Check the front guide groove of the cutting edge and flying shear;<\/p>\n\n\n\n

\u2463 Check the photoelectric cell and thermal detection signal.<\/p>\n\n\n\n

2.5 pile of steel at the looper <\/strong><\/h3>\n\n\n\n

alasan utama:<\/strong><\/p>\n\n\n\n

\u2460The looper delay setting is incorrect;<\/p>\n\n\n\n

\u2461Inappropriate setting of looper height;<\/p>\n\n\n\n

\u2462The set roller, guide roller or guide plate of the looper is seriously worn;<\/p>\n\n\n\n

\u2463 Looper scanner failure;<\/p>\n\n\n\n

\u2464The front thermal detection signal is blocked;<\/p>\n\n\n\n

\u2465 Excessive water mist or sunlight will affect the inspection results.<\/p>\n\n\n\n

Langkah-langkah penanganan:<\/strong><\/p>\n\n\n\n

\u2460Reset or adjust parameters;<\/p>\n\n\n\n

\u2461Replace the process spare parts, or repair the guide plate;<\/p>\n\n\n\n

\u2462 Replace the looper scanner and re-adjust the zero position;<\/p>\n\n\n\n

\u2463Add a fog blower to the place where there is a lot of water mist, and add a shielding board at a suitable angle for the sunlight.<\/p>\n\n\n\n

In the production process, when a steel pile accident occurs, due to the limitation of time and indicators, it is necessary to find the cause quickly and accurately. This requires a comprehensive consideration of the accident that occurred and multiple reasons to find the cause, so as to shorten the processing time and avoid repetition. Sexual accidents happen. It also requires on-site operators to continuously and regularly check the size of the rolled piece, the relationship between the stacking and pulling of the rolling mill, and the situation of guides and guards in daily production, so as to better reduce the frequency of accidents.<\/p>\n\n\n\n

\"Causes<\/figure>","protected":false},"excerpt":{"rendered":"

Keyword: high-speed wire rod process Desicription: Due to the fast rolling speed and small section size of small-size wire rod products, steel stacking accidents often occur. This paper introduces the reasons and solutions according to the classification of different rolling areas. The production line of China SHOUGANG No. 1 Wire Rod Factory, the maximum stable […]<\/p>","protected":false},"author":1,"featured_media":7188,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_templately_pack_id":"","_templately_imported_at":"","_templately_source":"","_templately_import_session_id":"","footnotes":""},"categories":[55],"tags":[],"class_list":["post-7185","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-lmm-group"],"_links":{"self":[{"href":"https:\/\/lmmrolls.com\/hi\/wp-json\/wp\/v2\/posts\/7185","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/lmmrolls.com\/hi\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/lmmrolls.com\/hi\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/lmmrolls.com\/hi\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/lmmrolls.com\/hi\/wp-json\/wp\/v2\/comments?post=7185"}],"version-history":[{"count":1,"href":"https:\/\/lmmrolls.com\/hi\/wp-json\/wp\/v2\/posts\/7185\/revisions"}],"predecessor-version":[{"id":7190,"href":"https:\/\/lmmrolls.com\/hi\/wp-json\/wp\/v2\/posts\/7185\/revisions\/7190"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/lmmrolls.com\/hi\/wp-json\/wp\/v2\/media\/7188"}],"wp:attachment":[{"href":"https:\/\/lmmrolls.com\/hi\/wp-json\/wp\/v2\/media?parent=7185"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/lmmrolls.com\/hi\/wp-json\/wp\/v2\/categories?post=7185"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/lmmrolls.com\/hi\/wp-json\/wp\/v2\/tags?post=7185"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}