Production method for preventing rolled hard surface of titanium plate from being scratched

Abstract

The invention provides a production method for preventing the hard surface of a titanium plate from being scratched. According to the characteristics of hot wire welding, in the welding process of the inlet section, the slow moving loop does not carry out tension withdrawing operation and directly carries out welding, the scratch defect generated in the tension withdrawing and tension building process in the welding process can be effectively prevented, the occurrence rate of the scratch defect is reduced through the production method, the yield of products is increased, and the production cost is reduced. The method has important industrial application value.

Description

Technical Field

[0001] The invention belongs to the field of cold rolling production of nonferrous metal titanium plate products, and in particular relates to a production method for preventing scratches from being generated on the rolled hard surface of a titanium plate. Background Art

[0002] The production of titanium plate hard-rolled surface is carried out on the hot annealing and pickling line, and its production steps are: hot rolling, annealing and pickling, cold rolling, re-annealing and pickling, and shearing process. The hot annealing and pickling line adopts a continuous production method, and welds each roll of strip steel at the entrance section welding machine. During welding, the front roll stays at the welding machine after the tail is swung. At this time, the slow-moving loop is withdrawn. When the rear roll is passed through the welding machine, the strip steel is pressed by welding machine clamps on both sides of the welding machine. The welding machine clamps are pressed down by a hydraulic device with a pressing force of 2000kg. After the welding machine clamps are pressed down, the seam alignment operation is carried out, and welding is carried out after the seam alignment is completed. The clamps are pressed down mainly to prevent the strip steel from moving during welding, resulting in poor weld quality and failure to meet the online standards. The surface contains more rolling oil. During the production of the hot annealing and pickling line, the tension of the rear slow-moving loop must be removed when welding is carried out at the entrance section, otherwise the strip at the welding machine clamping plate will be pulled to the slow-moving loop, resulting in abnormal welding, which will force the unit production to be interrupted, causing a great impact on the unit production. However, this method will cause serious scratches on the strip surface during the process of withdrawing and building tension during welding, and ultimately cause defective products to be scrapped. Because titanium plate products are relatively expensive and all of them are processed products, it seriously affects product quality and customer satisfaction.

[0003] In summary, in the traditional method of producing the titanium plate rolled hard surface on the thermal annealing and pickling line, the tension of the slow-moving loop needs to be removed during welding to prevent the strip from being pulled into the slow-moving loop, resulting in failure of normal welding. However, scratch defects are easily generated on the surface of the strip during the process of tension removal and tension establishment, affecting product quality and customer satisfaction. The present invention solves the above problems by improving the welding process. Summary of the invention

[0004] The invention provides a production method for preventing scratches on the rolled hard surface of a titanium plate, aiming to solve the scratch defects caused by tensioning and stretching during welding on the rolled hard surface of the titanium plate, and improve product quality and yield rate.

[0005] The present invention reduces the tension of the slow-moving looper during the tail swinging process and runs at a low speed, then directly moves the clamping plate at the welding machine clamping plate to clamp the tail of the strip without performing the tension withdrawal operation, thereby completely solving the problem of scratches on the hard-rolled titanium plate surface and the surface quality problem. Specifically, the following steps are included: (1) Reduce the tension of the slow-moving looper during the forward winding and tail swinging process at the entrance section; (2) When the tail of the strip runs to the welding machine clamping plate, the welding machine clamping plate is moved in an instant to clamp the strip without performing the tensioning operation; (3) After the rear coil is passed through the welding machine, the welding machine clamp is used to clamp the rear strip steel and perform normal welding operations; (4) After welding is completed, open the welding machine clamp, perform the crescent cutting operation, and resume normal operation.

[0006] The tension of the slow-moving loop is reduced to 1800kg. The pressure of the welding machine clamp is 2000kg. The entrance section tension is set to 3500kg, and the slow-moving loop tension is set to 4000kg. The strip steel specification is 2.0mm*1250mm.

[0007] Beneficial effects of the present invention: 1. The present invention solves the problem of scratches on the surface of titanium plates in a hard-rolled state, thereby improving production quality and product yield.

[0008] 2. During the process of the strip tail swinging forward in the entrance section, the present invention is different from the previous method of removing the tension of the slow-moving loop and then pressing the clamp to weld the seam when the strip tail reaches the welding machine clamp. Instead, the tension of the slow-moving loop is first reduced, and when the strip runs to the welding machine clamp, the welding machine clamp is moved in a short time to clamp the strip, and then the tension is not removed, thus avoiding the scratch defects caused by the removal and tensioning of the slow-moving loop and ensuring product quality.

[0009] 3. The present invention can effectively solve the problem of scratches on the hard-rolled surface of titanium plates, avoid scratches on the strip surface during the withdrawal and construction process, improve the quality of titanium plate products, and at the same time, completely solve the problem of frequent scrapping due to scratches on the hard-rolled surface of titanium plates, thereby improving the yield rate of products. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 The welding machine clamp is in open state during normal welding; Figure 2 The welding machine clamp is in the pressed down state; Figure 3 Scratches caused during the withdrawal and establishment process; Figure 4 There is no scratch defect after using the method of the present invention. DETAILED DESCRIPTION

[0011] The present invention will be further described below through specific implementation modes. Example

[0012] Taking the production of titanium plate with hard-rolled specifications of 2.0mm*1250mm as an example, during the production process, the entrance section tension is set to 3500kg, and the slow-moving loop tension is set to 4000kg. After the current coil tail is swung, the entrance section runs at a low speed, and the slow-moving loop tension is reduced in time. The slow-moving loop tension is reduced to 1800kg for control. When the tail of the strip runs to the welding machine clamp, the clamp is moved in an inching manner to clamp the strip without performing the tension removal operation. At this time, the slow-moving loop is in a tensioned state, and the strip is in a taut state, and no production will occur. There will be no scratch defects. When the following coil is put on line and threaded to the welding machine, the following strip will be clamped with the welding machine clamp and normal welding operation will be carried out. At this time, the tension of the slow-moving loop is reduced to 1800kg and the pressure of the welding machine clamp is 2000kg. The welding machine clamp will press the strip tightly and there is no risk of pulling the tail of the strip into the slow-moving loop. After welding, the welding machine clamp will be opened and the crescent cutting operation will be carried out. After the crescent cutting is completed, normal operation will be resumed. After the strip is running, the tension of the slow-moving loop will be increased to 4000kg for normal production.

[0013] The test results show that: after following the above operation method, the strip steel is always in a tensioned state during the welding process, avoiding scratch defects caused by the strip steel in a relaxed state during the tension withdrawal and tension establishment process ( Figure 3 ), currently after production according to this method, the surface quality of the strip is normal and the effect is good ( Figure 4 ).

Claims

1. A production method for preventing scratches on the hardened surface of a titanium plate, characterized in that: The following steps are involved: (1) Reduce the tension of the slow-moving looper during the forward winding and tail swinging process at the entrance section; (2) When the tail of the strip runs to the welding machine clamping plate, the welding machine clamping plate is moved in an instant to clamp the strip without performing the tensioning operation; (3) After the rear coil is passed through the welding machine, the welding machine clamp is used to clamp the rear strip steel and perform normal welding operations; (4) After welding is completed, open the welding machine clamp, perform the crescent cutting operation, and resume normal operation.

2. The production method according to claim 1, characterized in that The tension of the retarding loop is reduced to 1800 kg.

3. The production method according to claim 1, characterized in that The welding machine clamping plate pressure is 2000kg.

4. The production method according to claim 1, characterized in that The entrance section tension is set to 3500kg, and the slow-moving loop tension is set to 4000kg.

5. The production method according to claim 1, characterized in that: The strip steel specification is 2.0mm×1250mm.

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