CN104028553A - Method for producing TC4 titanium alloy bar wire by adopting high-speed continuous rolling mill - Google Patents

Abstract

The invention relates to a method for producing TC4 titanium alloy rods and wires by adopting a high-speed continuous rolling mill. The method is characterized in that a stepping heating furnace is used for heating a blank, and a TC4 titanium alloy rod and wire rod product is prepared by forging a TC4 titanium alloy square billet through a high-speed continuous rolling mill for primary rolling, pre-finish rolling, wire laying, air cooling and coil gathering. The invention can obtain the hot rolling rod and wire with target linear shape, roundness and surface by a single rolling process on the original method for producing the TC4 titanium alloy rod and wire by the high-speed continuous rolling mill, does not need intermediate annealing, shortens the production process flow, improves the quality, the yield and the yield of the rod and wire, and reduces the production cost of the TC4 titanium alloy rod and wire.

Description

A method for producing TC4 titanium alloy rods and wires using a high-speed continuous rolling mill

technical field

The invention relates to a method for hot-rolling TC4 titanium alloy rods and wires, in particular to a method for producing TC4 titanium alloy rods and wires by using a high-speed continuous rolling mill, and belongs to the technical field of metallurgy.

Background technique

At present, the production methods of TC4 titanium alloy rods and wires mainly include plastic processing methods such as rolling and drawing, and the most widely used two-roll and three-roll rolling methods require multiple annealing of the rod during the rolling process. The process not only It is complicated and greatly affects the performance of the bar; the microstructure of the titanium alloy bar rolled by the stepping mill has a large difference between the head and the tail; the continuous rolling stability of the Y-type rolling mill is poor and the equipment is relatively complicated, and it is inconvenient to change the roll and maintain; hot drawing Multiple tempering is required, the energy consumption is high, and the surface accuracy of rods and wires is not easy to control; cold drawing is only suitable for the production of small batches and small-sized products, and the efficiency is extremely low when the blank size is larger than Φ50; some technologies have not yet been used in actual production Many technologies are still in the laboratory stage, and the technology is not yet mature.

Contents of the invention

In order to overcome the deficiencies such as complicated procedures, large microstructure differences, poor surface accuracy, high energy consumption and low efficiency in the above-mentioned production of TC4 titanium alloy rods and wires, the purpose of the present invention is to provide a production method for TC4 titanium alloy rods and wires, which uses The method for producing TC4 titanium alloy rods and wires by a high-speed continuous rolling mill can produce the required rods and wires in a single hot rolling process, and does not require intermediate annealing, and has the advantages of simple process and low cost.

In order to achieve the above object, the present invention provides a method for producing TC4 titanium alloy rods and wires using a high-speed continuous rolling mill.

A method for producing TC4 titanium alloy rods and wires using a high-speed continuous rolling mill. The invention adopts a step-by-step heating furnace to heat the billet, and carries out preliminary rolling, pre-finishing rolling, finishing rolling, silk spinning, air cooling, and coil collection through the high-speed continuous rolling mill. A method for making TC4 titanium alloy rod and wire products from TC4 titanium alloy forged billet; the method does not require intermediate annealing;

Among them: the specification of TC4 titanium alloy forging billet is square billet: 100mm×100mm×L～150mm×150mm×L, or round bar of Φ50mm～Φ150mm;

The temperature of the heated billet is 850 ° C ~ 950 ° C, and the holding time is 2 hours;

16 flat-vertical-alternating tandem rolling mills are used for rough rolling without torsion rolling, and a set of collectively driven torsion-free cantilever rolling mills are used for pre-finishing to realize torsion-free and micro-tension rolling with short stand spacing. Morgan high-speed non-twist rolling is used for finishing rolling The twisted wire rod is rolled by the finishing rolling unit, and all rolling speeds are controlled at 50-100m/s;

The initial rolling and pre-finishing temperature are controlled at 850°C to 950°C, the finish rolling temperature is controlled at 800°C to 980°C, and the spinning temperature is less than 900°C. The finishing rolling temperature and spinning temperature are reduced by turning on the cooling water, and the fan is used to accelerate rod cooling;

The TC4 titanium alloy rods and wires produced by the method provided by the present invention are wire rods with a specification of Φ6mm-Φ12mm.

The beneficial effects of the present invention are that, due to the provided method for producing TC4 titanium alloy rods and wires in the original high-speed continuous rolling mill, the hot-rolled rods and wires of the target line shape, roundness and surface can be obtained through a single rolling process, and no further processing is required. Intermediate annealing shortens the production process, improves the quality, output and yield of rods and wires, and reduces the production cost of TC4 titanium alloy rods and wires.

Detailed ways

In order to have a clearer understanding of the technical features, purposes and beneficial effects of the present invention, the technical solution of the present invention is described in detail below, but it should not be construed as limiting the scope of implementation of the present invention.

A method for producing TC4 titanium alloy rods and wires using a high-speed continuous rolling mill. The invention adopts a step-by-step heating furnace to heat the billet, and carries out preliminary rolling, pre-finishing rolling, finishing rolling, silk spinning, air cooling, and coil collection through the high-speed continuous rolling mill. A method for making TC4 titanium alloy rod and wire products from TC4 titanium alloy forged billet; the method does not require intermediate annealing;

Among them: the specification of TC4 titanium alloy forging billet is square billet: 100mm×100mm×L～150mm×150mm×L, or round bar of Φ50mm～Φ150mm;

The temperature of the heated billet is 850 ° C ~ 950 ° C, and the holding time is 2 hours;

16 flat-vertical-alternating tandem rolling mills are used for rough rolling without torsion rolling, and a set of collectively driven torsion-free cantilever rolling mills are used for pre-finishing to realize torsion-free and micro-tension rolling with short stand spacing. Morgan high-speed non-twist rolling is used for finishing rolling The twisted wire rod is rolled by the finishing rolling unit, and all rolling speeds are controlled at 50-100m/s;

The initial rolling and pre-finishing temperature are controlled at 850°C to 950°C, the finish rolling temperature is controlled at 800°C to 980°C, and the spinning temperature is less than 900°C. The finishing rolling temperature and spinning temperature are reduced by turning on the cooling water, and the fan is used to accelerate rod cooling;

The TC4 titanium alloy rods and wires produced by the method provided by the present invention are wire rods with a specification of Φ6mm-Φ12mm.

In the above method, the processes of heating, rough rolling, pre-finish rolling, finish rolling, spinning, and air cooling can be carried out according to existing methods, preferably, can be carried out according to the following steps respectively:

Heating: Heating with a walking heating furnace, the heating temperature is controlled between 850°C and 950°C, the heating time of the billet is reduced, and the temperature rises with the furnace. After reaching the temperature, keep it warm for 0.5 to 2 hours and then start rolling;

Preliminary rolling: 16 flat-vertical-alternating tandem rolling mills are used for twist-free rolling, and the deformation at the end of preliminary rolling is controlled at 50% to 70%;

Pre-finishing rolling: a group of collectively driven torsion-free cantilever rolling mills is used to realize short-stand-space torsion-free and micro-tension rolling. In order to ensure the complete cross-sectional shape, accurate size and stable process of the rolled piece, the deformation at the end of pre-finishing is controlled by 40 %～60% range;

Finish rolling: Morgan-type high-speed twist-free wire finishing mill, ellipse-round hole system and spinning system are used to roll products of various specifications.

Air-cooling: The wire rod is air-cooled by the Stelmore air-cooling system.

The present invention also provides a TC4 titanium alloy rod and wire, which is produced by the above-mentioned method for producing TC4 titanium alloy rod and wire by using a high-speed continuous rolling mill.

The method for producing TC4 titanium alloy rods and wires with a high-speed continuous rolling mill provided by the present invention can obtain hot-rolled rods and wires with the target line shape, roundness and surface through a single rolling process, and does not require intermediate annealing, which shortens the production process. , and improve the quality, output and yield of rods and wires, which is conducive to reducing the production cost of TC4 titanium alloy rods and wires. It can meet the production requirements without modifying existing equipment and realize the diversification of TC4 titanium alloy rods and wires products .

Example 1

This embodiment provides a TC4 titanium alloy wire rod with a specification of Φ6mm, which is prepared through the following steps:

Heating: Put a TC4 titanium alloy forged billet with a specification of 150mm×150mm×L into a walking heating furnace, and the heating conditions are shown in Table 1. Rolling follows immediately after heating.

Preliminary rolling: 16 flat-vertical-alternating tandem rolling mills are used for torsion-free rolling. The initial rolling conditions and rolling deformation are shown in Table 1.

Pre-finish rolling: A group of collectively driven torsion-free cantilever rolling mills is used to realize short-stand-space torsion-free and micro-tension rolling to achieve complete section shape, precise size and stable process of the rolled piece. The pre-finish rolling conditions and rolling deformation are as follows: Table 1 shows.

Finish rolling: Morgan-type high-speed twist-free wire rod finishing mill, ellipse-round hole system and spinning system are used. The finishing rolling conditions and spinning system are shown in Table 1. After rolling, a TC4 titanium alloy wire product with an expected specification of Φ6mm is obtained.

Air-cooling: The TC4 titanium alloy wire rod is air-cooled by the Stelmore air-cooling system, and the coils are collected and bundled after the air-cooling is completed. Get TC4 titanium alloy wire products of corresponding specifications.

For the TC4 wire rod with the above-mentioned specifications of Φ6mm, when it is rolled by a conventional hot rolling mill, its output is 6 tons/hour, and the yield is 90%; and when it is rolled by the method provided in this embodiment, its output is 25 tons/hour, the finished product rate is 95%.

Table 1 Conditions of each process in the process of rolling Φ6mmTC4 wire rod

Example 2

This embodiment provides a TC4 titanium alloy bar with a specification of Φ8mm, which is prepared through the following steps:

Heating: Put a TC4 titanium alloy forged billet with a specification of 150mm×150mm×L into a walking heating furnace, and the heating conditions are shown in Table 2. Rolling follows immediately after heating.

Preliminary rolling: 16 flat-vertical-alternating tandem rolling mills are used for torsion-free rolling. The initial rolling conditions and rolling deformation are shown in Table 2.

Pre-finish rolling: A group of collectively driven torsion-free cantilever rolling mills is used to realize short-stand-space torsion-free and micro-tension rolling to achieve complete section shape, precise size and stable process of the rolled piece. The pre-finish rolling conditions and rolling deformation are as follows: Table 2 shows.

Finish rolling: Morgan-type high-speed twist-free wire rod finishing mill, ellipse-round hole system and spinning system are used. The finishing rolling conditions and spinning system are shown in Table 2. After rolling, a TC4 titanium alloy bar product with an expected specification of Φ8mm is obtained.

Air-cooling: The TC4 titanium alloy wire rod is air-cooled by the Stelmore air-cooling system, and the coils are collected and bundled after the air-cooling is completed. Get the TC4 titanium alloy bar products of corresponding specifications.

For the TC4 bar with the above-mentioned specifications of Φ8mm, when it is rolled by a conventional hot rolling mill, its output is 6 tons/hour, and the yield is 90%; and when it is rolled by the method provided in this embodiment, its output It is 26 tons/hour, and the finished product rate is 97%.

Table 2 Conditions of each process in the process of rolling Φ8mmTC4 bar

Example 3

This embodiment provides a TC4 titanium alloy bar with a specification of Φ10mm, which is prepared through the following steps:

Heating: Put a TC4 titanium alloy forged billet with a specification of 150mm×150mm×L into a walking heating furnace, and the heating conditions are shown in Table 3. Rolling follows immediately after heating.

Preliminary rolling: 16 flat-vertical-alternating tandem rolling mills are used for torsion-free rolling. The initial rolling conditions and rolling deformation are shown in Table 3.

Pre-finish rolling: A group of collectively driven torsion-free cantilever rolling mills is used to realize short-stand-space torsion-free and micro-tension rolling to achieve complete section shape, precise size and stable process of the rolled piece. The pre-finish rolling conditions and rolling deformation are as follows: Table 3 shows.

Finish rolling: Morgan-type high-speed twist-free wire rod finishing mill, ellipse-round hole system and spinning system are used. The finishing rolling conditions and spinning system are shown in Table 3. After rolling, a TC4 titanium alloy bar product with an expected specification of Φ10mm is obtained.

Air-cooling: The TC4 titanium alloy wire rod is air-cooled by the Stelmore air-cooling system, and the coils are collected and bundled after the air-cooling is completed. Get the TC4 titanium alloy bar products of corresponding specifications.

For the TC4 bar with the above-mentioned specifications of Φ10mm, when it is rolled by a conventional hot rolling mill, its output is 6 tons/hour, and the yield is 90%; and when it is rolled by the method provided in this embodiment, its output It is 29 tons/hour, and the finished product rate is 96%.

Table 3 Conditions of each process in the process of rolling Φ10mm TC4 bar

Claims (2)

1. A method for producing TC4 titanium alloy rods and wires using a high-speed continuous rolling mill, characterized in that the billet is heated by a step-by-step heating furnace, and preliminary rolling, pre-finishing rolling, finishing rolling, spinning, and air cooling are carried out by the high-speed continuous rolling mill 1. A method for making TC4 titanium alloy rod and wire products from TC4 titanium alloy forged billets by rolling; Among them: the specification of TC4 titanium alloy forging billet is square billet: 100mm×100mm×L～150mm×150mm×L, or round bar of Φ50mm～Φ150mm; The temperature of the heated billet is 850 ° C ~ 950 ° C, and the holding time is 2 hours; 16 flat-vertical-alternating tandem rolling mills are used for rough rolling without torsion rolling, and a set of collectively driven torsion-free cantilever rolling mills are used for pre-finishing to realize torsion-free and micro-tension rolling with short stand spacing. Morgan high-speed non-twist rolling is used for finishing rolling The twisted wire rod is rolled by the finishing rolling unit, and all rolling speeds are controlled at 50-100m/s; The initial rolling and pre-finishing temperature are controlled at 850°C to 950°C, the finish rolling temperature is controlled at 800°C to 980°C, and the spinning temperature is less than 900°C. The finishing rolling temperature and spinning temperature are reduced by turning on the cooling water, and the fan is used to accelerate The wire rod cools. 2. A kind of TC4 titanium alloy rod and wire produced by the method for producing TC4 titanium alloy rod and wire by high-speed continuous rolling mill according to claim 1, characterized in that, the specification of the TC4 titanium alloy rod and wire is a wire rod of Φ6mm～Φ12mm .