CN112077252A - A kind of forging die and free forging processing method of near-net-shaped titanium strip slab - Google Patents

Abstract

The invention discloses a forging die for near-net-shape titanium strip slabs, which includes a bottom plate, one end of the bottom plate is provided with a transition baffle and a vertical baffle in sequence from bottom to top, and a first side wall surface of the transition baffle is provided. On the same side as the second side wall surface of the vertical baffle, the first side wall surface, the second side wall surface and the upper surface are the contact surfaces between the mold and the blank; the first side wall surface and the second side wall surface are arc surfaces, the first The upper surface of the bottom plate is a rectangular plane, and the first side wall surface is smoothly connected to the upper surface through the transition of the second side wall surface; a number of hoisting holes are arranged on the side wall surface of the bottom plate. Also disclosed is a free forging processing method for near-net-shape titanium strip slabs using the die, which greatly improves the yield on the premise of ensuring a simple processing process and significantly improved production efficiency.

Description

A kind of forging die and free forging processing method of near-net-shaped titanium strip slab

technical field

The invention belongs to the technical field of material processing, in particular to a forging die for near-net-shape titanium strip slabs, and also relates to a free forging processing method for near-net-shape titanium strip slabs.

Background technique

Titanium and titanium alloys are widely used in ships and marine engineering due to their high specific strength, low density, non-magnetic, and excellent corrosion resistance. Titanium and titanium alloy strips are widely used in chemical industry, ship industry, aerospace, high-end building exterior decoration and other industries due to their advantages of small specific gravity, good corrosion resistance, high temperature resistance, and good stability. And the amount is increasing year by year. However, due to the high price of raw materials, difficult processing, long processing route and low yield of titanium and titanium alloys, the price of terminal materials is still high.

In order to solve this contradiction and make titanium and titanium alloys popular in a wider range, in recent years, researchers in the field of titanium processing at home and abroad have made a lot of research and efforts. Although some achievements have been made, they are still far from the goal.

At present, there are two basic processes for the production of titanium strips at home and abroad. One is to use the cooling-bed furnace smelting process to smelt the ingot into a billet size that can be rolled directly, eliminating the need for intermediate links. direct rolling. The advantage is that the intermediate processing links are omitted, and the yield is improved to a certain extent. However, the as-cast structure caused by smelting cannot be effectively improved, and it is directly left to the finished strip, resulting in the strip cannot be used normally, especially for thin strips. Defects such as holes and porosity are particularly obvious. Therefore, this process can only produce low-end titanium strips with larger thicknesses and lower requirements in small quantities. The other is to smelt into round ingots through consumable electrodes, form titanium strip billets through free forging, and then roll them into titanium strips. The titanium strip produced by this process is completely broken and compacted by the free forging process, so that the structure and morphology of the material are fundamentally changed. The rolled titanium strips of various specifications have excellent quality and can meet various The only disadvantage of the market demand is that it needs to go through the free forging process, resulting in a low comprehensive yield of titanium strips and a high price of titanium strips.

Therefore, the present invention is based on the second process route. On the one hand, special tooling and dies are designed and manufactured according to process requirements, so that the industrialized production process is simple and effective, and the production efficiency is greatly improved; on the other hand, the titanium strip slab free forging process technology is adopted. The parameter control increases the yield of the free forging of the titanium strip slab by more than 10% to 98%. This technology breaks through the key technical bottleneck of the preparation of domestic and foreign titanium strip slabs, and finally obtains a free forging processing method of near-net-shaped titanium strip slabs.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a forging die for near-net-shaped titanium strip slabs, so that the phenomenon of lack of flesh at the head and tail edges and corners of the titanium strip slabs can be solved, and the forging yield of titanium strip free forging slabs can be greatly improved.

Another object of the present invention is a free forging processing method for near-net-shaped titanium strip slabs, which can greatly improve the yield on the premise of ensuring a simple processing process and significantly improved production efficiency.

The technical scheme adopted in the present invention is a forging die for near-net-shape titanium strip slabs, comprising a bottom plate, one end of the bottom plate is provided with a transition baffle and a vertical baffle sequentially from bottom to top, and the transition baffle The first side wall surface and the second side wall surface of the vertical baffle are on the same side, and the first side wall surface, the second side wall surface and the upper surface are the contact surfaces of the mold and the blank;

The first side wall surface and the second side wall surface are both arc surfaces, the upper surface of the first bottom plate is a rectangular plane, and the first side wall surface is smoothly connected to the upper surface through the transition of the second side wall surface; the side wall surface of the bottom plate is provided with several hoisting devices hole.

The present invention is also characterized in that,

The radius corresponding to the curvature of the first side wall surface is R=50-100mm; the radius corresponding to the curvature of the second side wall surface is R=3000-4000mm.

The surface roughness Ra of the first side wall surface, the second side wall surface and the upper surface is not more than 3.2μm; the thickness of the bottom plate is not less than 200mm; the thickness of the vertical baffle is 200-400mm.

The bottom plate, transition baffle and vertical baffle are all 5CrMnMo plates.

The second technical solution adopted by the present invention is a free forging processing method of a near-net-shaped titanium strip slab, which is specifically implemented according to the following steps:

Step (1) ingot preparation: peel the raw material titanium and titanium alloy ingots through the outer circumferential direction, remove the surface oxide scale and subcutaneous pore defects generated during the smelting process, and then carry out the flattening treatment on the head of the ingot to remove the smelting process The coral-like molten tumor defect generated at the riser position of the middle ingot, and then the end face defects at the bottom of the ingot are removed, and then the head and tail of the ingot are rounded;

Step (2) ingot heating: heating the ingot according to a certain heating process;

Step (3) Billeting forging: transfer the heated ingot to the forging press, first lightly forge one to two times, and then increase the reduction for forging, and forge the heated ingot to a thickness of 800mm During the forging process, the billet is turned over, and the reduction is increased for forging. During the forging process, try to ensure that the upper and lower deformations are consistent, and finally control the thickness size within the range of 600-700mm;

Step (4) Control forging with special tool and die: For the blank forged to a size range of 600-700 mm, the above-mentioned die is used for forging deformation;

Step (5) tempering and heating: perform tempering and heating treatment on the hot billet after forging in step (4), the heating temperature is 900-950° C., and the holding time is 90-200 minutes to obtain an intermediate billet;

Step (6) forming and forging: the intermediate billet tempered and heated in step (5) is forged on a fast forging machine to obtain finished billets of titanium and titanium alloy titanium strip slabs.

The present invention is also characterized in that,

The grades of raw material titanium and titanium alloy ingots used in step (1) are TA1, TA2, TA3, TA4 or TA10.

In step (1), the titanium and titanium alloy ingots used are secondary smelting by vacuum consumable arc method, and the diameters are ingot shapes of Φ1000mm and above.

In step (1), the radius R of the head and tail of the ingot is 15mm-20mm.

In step (2), the ingot heating process is as follows: firstly, the temperature is raised from room temperature to 800～850°C, and the temperature rise time is 150～180 minutes; then the temperature is kept at 800～850°C for 180～250 minutes; ～1050°C, the heating time is 180～250 minutes; finally, the temperature is kept at 1000～1050°C for 180～250 minutes.

In step (3), when the ingot is lightly pressed one to two times, the reduction is controlled at 30-50 mm, and the reduction is further increased for forging, and the reduction is controlled at 80-100 mm on one side; step (4) The specific implementation steps are as follows: when forging a billet with a thickness of 600-700 mm, make the end face of the billet close to the second side wall surface (3-1) of the special tool and die, and repeatedly press down by 100-120 mm each time to forge the billet. To the thickness between 300～400mm size; in step (6), the obtained titanium and titanium alloy titanium strip slab finished blank size is: thickness×width×length=180mm～250mm×1000mm～1600mm×5000mm～9000mm of titanium With slabs.

The beneficial effects of the present invention are:

(1) The method of the present invention breaks through the key technical bottleneck of the preparation of domestic and foreign titanium strip slabs by reasonably using special tools and dies in the free forging production process, and finally obtains a free forging processing method for near-net-shaped titanium strip slabs.

(2) The method of the present invention increases the forging yield of free forging slabs for titanium strips from 88% to 98% from the industry's existing level by reasonably using special tools and dies in the free forging production process, and the yield is greatly improved;

(3) The method of the present invention completely solves the phenomenon of lack of flesh at the head and tail edges and corners of the titanium strip slab by reasonably using special tools and dies in the free forging production process;

(4) The method of the present invention adopts a large deformation in the forging process through reasonable use of special tools and dies in the production process of free forging, so that the as-cast structure of the ingot is fully broken and compacted, and the structure and morphology of the slab are obtained. Fundamentally changed, the internal quality of the slab is significantly improved;

(5) The method of the present invention significantly shortens the production time and significantly improves the production efficiency compared with the existing domestic and foreign preparation processes under the premise of greatly improving the yield by reasonably using special tools and dies in the free forging production process.

Description of drawings

Fig. 1 is the structural representation of the forging die of a kind of near-net-shape titanium strip slab of the present invention;

Fig. 2 is the topography diagram of the head of the ingot before the method of the present invention is implemented;

3 is a topography diagram of the head of the ingot after the implementation of the method step 1 of the present invention;

Fig. 4 is the topography of the surface of the finished slab head before the method of the present invention is implemented;

Fig. 5 is the surface topography diagram of the finished slab head after the method of the present invention is implemented;

Fig. 6 is the topography diagram of the part to be removed from the head of the finished slab before the method of the present invention is implemented;

Fig. 7 is the topography diagram of the part to be cut or milled at the head of the finished slab after the method of the present invention is implemented;

FIG. 8 is a physical view of the cut part of the slab head before the method of the present invention is implemented;

Fig. 9 is the actual picture of the cut part of the slab head after the method of the present invention is implemented;

Figure 10 is a physical view of the finished slab after the method of the present invention is implemented.

In the figure, 1. bottom plate, 2. transition baffle, 3. vertical baffle, 4. hoisting hole, 1-1. upper surface, 2-1. first side wall surface, 3-1. second side wall surface.

Detailed ways

The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

The present invention provides a forging die for near-net-shape titanium strip slabs. As shown in FIG. 1 , it includes a bottom plate 1, and one end of the bottom plate 1 is sequentially provided with a transition baffle 2 and a vertical baffle 3 from bottom to top. , the first side wall surface 2-1 of the transition baffle 2 and the second side wall surface 3-1 of the vertical baffle 3 are on the same side, the first side wall surface 2-1, the second side wall surface 3-1 and the upper surface 1- 1 is the contact surface between the mold and the blank;

The first side wall surface 2-1 and the second side wall surface 3-1 are both arc surfaces, the upper surface 1-1 of the first bottom plate 1 is a rectangular plane, and the first side wall surface 2-1 transitions through the second side wall surface 3-1 It is smoothly connected with the upper surface 1-1; the side wall surface of the bottom plate 1 is provided with several hoisting holes 4.

The radius corresponding to the radian of the first side wall surface 2-1 is R=50-100 mm; the radius corresponding to the radian of the second side wall surface 3-1 is R=3000-4000 mm.

The surface finish Ra of the first side wall surface 2-1, the second side wall surface 3-1 and the upper surface 1-1 is not greater than 3.2 μm; the thickness of the bottom plate 1 is not less than 200 mm; the thickness of the vertical baffle 3 is 200-400 mm .

The bottom plate 1, the transition baffle 2 and the vertical baffle 3 are all 5CrMnMo plates.

The mold of the present invention is made of 5CrMnMo material, and the design points and the force-bearing surface should fully meet the technological requirements of the use process. Among them, the thickness of the vertical baffle 3 in Figure 1 is 200-400mm. The thickness of the slab end mainly considers the lateral pressure generated by the flow of the blank during the forming process of the slab end. In the design, it is considered that the force is not less than that caused by the flow of the blank. The maximum transverse pressure generated, the design thickness is determined according to the maximum transverse pressure. This surface is not in contact with the blank, so there is no requirement for surface finish. In Figure 1, the second side wall surface 3-1 is the main working surface for forming the head and tail end faces of the titanium strip. In order to basically achieve the head and tail of the finished titanium strip slab, the design of this surface should be cambered, and the surface finish Ra is not greater than or less than 3.2μm, the arc design range should be controlled between R = 3000 ~ 4000mm, otherwise it will cause the head and tail of the finished slab to sag and the end to be uneven. The first side wall surface 2-1 in Figure 1 should consider the arc design, the surface finish Ra should not be greater than 3.2μm, and the arc design range should be controlled between R=50~100mm. The purpose is mainly to consider the titanium strip blank forming process, Here the billet flow is more difficult to reach. Secondly, if the right-angle design is adopted, it is easy to produce serious stress concentration here, which will cause the tool and die to break from here. In Figure 1, the contact surface in the length and width directions of the blank forming process has the largest contact surface and the largest force. The design mainly considers the size requirements of the blank length and width direction deformation process that the upper surface 1-1 should meet. At the same time, it should be fully considered that the overall flatness of the bottom surface used for a long time in the process of blank deformation should not be greater than 10mm. In Figure 1, the thickness of the bottom surface of the special tool and die, its force is mainly the vertical force between the upper and lower hammer heads on the blank forging, and its thickness is not less than 200mm. The hoisting hole 4 in Fig. 1 is designed considering the convenient hoisting of the tool and die in use. In Figure 1, in the mold, the side wall surface that is not in contact with the billet, since the billet has to be forged from the size range of 600-700mm to 300-400mm, therefore, the design should consider that the net height in contact with the bottom surface is not less than the size of the billet.

The present invention also provides a free forging processing method for near-net-shaped titanium strip slabs, as shown in Figure 2-10, which is specifically implemented according to the following steps:

Step (1) ingot preparation: peel the raw material titanium and titanium alloy ingots through the outer circumferential direction, remove the surface oxide scale and subcutaneous pore defects generated during the smelting process, and then carry out the flattening treatment on the head of the ingot to remove the smelting process For the coral-like molten tumor defect generated at the riser position of the middle ingot, then remove the end surface defects at the bottom of the ingot, and then round the head and tail of the ingot (see Figure 2);

The grades of raw material titanium and titanium alloy ingots used in step (1) are TA1, TA2, TA3, TA4 or TA10.

In step (1), the titanium and titanium alloy ingots used are secondary smelting by vacuum consumable arc method, and the diameters are ingot shapes of Φ1000mm and above.

In step (1), the radius R of the head and tail of the ingot is 15mm-20mm.

Step (2) ingot heating: scientific and reasonable process and heating curve should be adopted for ingot heating, so as to ensure uniform heating of ingot and realize the forging process. Heating the ingot according to a certain heating process;

In step (2), the ingot heating process is as follows: firstly, the temperature is raised from room temperature to 800～850°C, and the temperature rise time is 150～180 minutes; then the temperature is kept at 800～850°C for 180～250 minutes; ～1050°C, the heating time is 180～250 minutes; finally, the temperature is kept at 1000～1050°C for 180～250 minutes.

Step (3) Billeting forging: transfer the heated ingot to the forging press, first lightly forge one to two times, and then increase the reduction for forging, and forge the heated ingot to a thickness of 800mm During the forging process, the billet is turned over, and the reduction is increased for forging. During the forging process, try to ensure that the upper and lower deformations are consistent, and finally control the thickness size within the range of 600-700mm;

In step (3), when the ingot is lightly pressed for one to two times, the reduction is controlled at 30-50 mm, and the reduction is further increased for forging, and the reduction is controlled at 80-100 mm on one side;

Step (4) Control forging with special tool and die: For the blank forged to the size range of 600-700mm, the above-mentioned die is used for forging deformation; Step (4) Using the deformation principle of the metal minimum resistance law, it should be formed by turning over and pressing;

The specific implementation steps of step (4) are: when forging the blank forged to 600-700mm, make the end face of the blank close to the second side wall surface 3-1 of the special tool die, and repeatedly press by pressing down 100-120mm each time, And using the deformation principle of the metal minimum resistance law, the billet is forged to a thickness of 300-400mm, and an intermediate billet with a concave end face shape that meets the process requirements is obtained;

Step (5) tempering heating: formulate a reasonable heating temperature curve, and perform tempering heating treatment on the hot billet after forging in step (4), the heating temperature is 900-950 ° C, and the holding time is 90-200 minutes to obtain an intermediate billet;

Step (6) Forming and forging: the intermediate billet tempered and heated in step (5) is forged on a fast forging machine to obtain a finished billet of titanium and titanium alloy titanium strips without tongue and surface defects, as shown in Figure 10. Show. The slab used for the titanium strip without plate tongue should be basically flush with the head and tail end faces of the slab after forging, without sawing or the forging yield after head and tail sawing is not less than 98%.

In step (6), the obtained titanium and titanium alloy titanium strip slabs have the following dimensions: thickness×width×length=180mm～250mm×1000mm～1600mm×5000mm～9000mm slabs for titanium strips.

During the smelting process of the titanium ingot, the head of the ingot will produce a lump phenomenon (see Figure 2), and this lump will cause serious surface defects on the surface of the finished slab in the later production process of the titanium strip slab. . In order to avoid serious defects caused by ingot melting on the slab surface, the method of the present invention is described in detail in the ingot preparation process in step 1, and the ingot preparation process is implemented to effectively control ingot defects such as melting nodules. After the implementation, the shape of the head of the ingot is obviously improved, as shown in 3.

Before the ingot preparation process of the present invention is implemented, in the process of preparing the slab, the end face of the ingot is turned over to the surface of the slab, which has a serious impact on the surface of the finished slab, so that the longer part of the slab head cannot be used, see Figure 4 .

After the ingot preparation process of the present invention is carried out, the end face fusion of the ingot is effectively removed, and the ingot end face fusion no longer has a serious impact on the surface of the finished slab during the slab preparation process, and the surface quality of the produced slab head is Better, as shown in Figure 5.

Before the implementation of the method of the present invention, since the deformation process of the end face of the ingot of the titanium strip slab is free deformation during the production process, under the forging of the upper and lower hammer heads, the end face of the titanium strip is freely deformed, and all of them produce relatively large deformations. The large protruding tongue, which can only be removed as scrap (see the outer part of the straight line in Figure 6), has a great impact on the yield.

In order to minimize the waste loss caused by the protruding tongue portion of the head, during the implementation of step 4 of the method of the present invention, at a certain stage of the deformation process of the blank, a special tool and die are used to effectively intervene in the deformation of the end of the blank. The end of the finished slab is flushed, and the end is slightly milled without cutting off or without cutting, which greatly reduces the waste loss (see the outer part of the straight line in Figure 7), and finally greatly improves the yield of the titanium strip slab.

As can be seen from Figure 8, before the implementation of the slab head, the tongue protrudes seriously, and there are many defects such as surface melting, and it cannot be used at all. Therefore, the cut part is very large, and the cut part of the head of each slab is 600~ Between 700 kg, the loss of blanks is very serious, which also leads to a very low yield of the product.

As can be seen from Figure 9, after the implementation, the slab head is basically flush, there is no protruding plate tongue, and the defects such as surface fusion have been well controlled. Therefore, the slab head is cut very small, and each slab head The average cut or milled part is between 40 and 80 kg, the blank loss is very small, and the yield is significantly improved.

Example 1

A method for free forging processing of near-net-shaped titanium strip slabs, which is specifically implemented according to the following steps:

Step (1) Ingot preparation: The titanium and titanium alloy ingots smelted by the vacuum consumable electric arc furnace for the second time are peeled along the circumferential direction by a heavy-duty lathe. Then remove the defects on the head and bottom end faces of the ingot (especially the coral-like defects at the riser position of the ingot). Secondly, the head and tail of the ingot are rounded.

In step (1), the titanium and titanium alloy ingots used are secondary smelting by vacuum consumable arc method, the grade is TA1, the diameter is Φ1020mm, and the weight is 8995kg.

In step (1), the radius of the rounded corners of the head and tail of the ingot is R=15mm.

Step (2) ingot heating: firstly, the temperature is raised from room temperature to 800°C, and the heating time is 150 minutes; then the temperature is kept at 800°C for 180 minutes; the temperature is then raised to 1000°C, and the heating time is 180 minutes; Holding time 180 minutes.

Step (3) Billeting forging: transfer the heated ingot to the forging press, first lightly forge one to two times, and then increase the reduction for forging, and forge the heated ingot to a thickness of 800mm During the forging process, the blank is turned over, and the reduction is increased for forging. During the forging process, try to ensure that the upper and lower deformations are consistent, and finally control the thickness size within the range of 600mm;

In step (3), when the ingot is lightly pressed one to two times, the reduction is controlled to 30mm, and the reduction is further increased for forging, and the reduction is controlled at 800mm on one side;

Step (4) Control forging by special tool and die: When forging the blank forged to 600mm, make the end face of the blank close to 3-1 of the second side wall surface of the special tool and die, repeat pressing by pressing down 100mm each time, and use the minimum metal According to the deformation principle of the resistance law, the blank is forged to a thickness of 300mm to obtain an intermediate blank with a concave end face that meets the process requirements;

Step (5) tempering heating: formulate a reasonable heating temperature curve, carry out tempering heating treatment on the hot billet after forging in step (4), the heating temperature is 900 ° C, and the holding time is 90 minutes to obtain an intermediate billet;

Step (6) Forming and forging: The tempered and heated intermediate billet is free forged on a forging press. During this process, attention should be paid to the overall size, edges and corners of the slab to meet the technological requirements, and the final finished product size is: the finished product size is 220 (thickness) x 1280 (width) x 6970 (length) mm of slabs for lingual titanium strips.

Example 2

The titanium and titanium alloy ingots used in the step (1) are secondary smelting by vacuum consumable arc method, the grade is TA1, the diameter is Φ1020mm, and the weight is 8960kg. The remaining forging methods and process parameters are the same as in Example 1, and the size of the obtained product is: 220 (thickness)×1280 (width)×6940 (length) mm.

Example 3

The titanium and titanium alloy ingots used in the step (1) are secondary smelting by vacuum consumable arc method, the grade is TA1, the diameter is Φ1020mm, and the weight is 8990kg. The remaining forging methods and process parameters are the same as those in Example 1, and the size of the obtained finished product is: 220 (thickness)×1280 (width)×6970 (length) mm.

Example 1-3 Effect verification:

After effect verification is carried out to the slabs for three titanium strips obtained in Example 1-3, the data are as follows:

It can be seen from the verification data that the yield of the three ingots after forging has increased by 10.42% compared with 88% before implementation, reaching 98.42%. With an annual output of 20,000 tons of titanium belt products of this specification, the current market price is 85,000 yuan / t, and the residual material is 30,000 yuan / t, then: 20,000 × 10.42% × (8.5-3.0) = 114.62 million yuan; The economic benefit created for the enterprise is 114.62 million yuan.

Example 4

A method for free forging processing of near-net-shaped titanium strip slabs, which is specifically implemented according to the following steps:

Step (1) ingot preparation: peel the raw material titanium and titanium alloy ingots through the outer circumferential direction, remove the surface oxide scale and subcutaneous pore defects generated during the smelting process, and then carry out the flattening treatment on the head of the ingot to remove the smelting process For the coral-like molten tumor defect generated at the riser position of the middle ingot, then remove the end surface defects at the bottom of the ingot, and then round the head and tail of the ingot (see Figure 2);

The raw material titanium and titanium alloy ingots used in the step (1) have a grade of TA2, a diameter of Φ1020mm, and a weight of 9000kg.

In step (1), the titanium and titanium alloy ingots used are secondary smelted by vacuum consumable arc method, and the diameter is Φ1500mm.

In step (1), the radius of the ingot head and tail fillet is R=20mm.

Step (2) ingot heating: scientific and reasonable process and heating curve should be adopted for ingot heating, so as to ensure uniform heating of ingot and realize the forging process. Heating the ingot according to a certain heating process;

In step (2), the ingot heating process is as follows: firstly, the temperature is raised from room temperature to 850°C, and the temperature rise time is 180 minutes; then the temperature is kept at 850°C, and the temperature rise time is 250 minutes; Incubate at 1050°C for 250 minutes.

Step (3) Billeting forging: transfer the heated ingot to the forging press, first lightly forge one to two times, and then increase the reduction for forging, and forge the heated ingot to a thickness of 800mm During the forging process, the blank is turned over, and the reduction is increased for forging. During the forging process, the upper and lower deformations are kept as consistent as possible, and the thickness size is finally controlled within the 700mm range;

In step (3), when the ingot is lightly pressed one to two times, the reduction is controlled at 50mm, and the reduction is further increased for forging, and the reduction is controlled at 100mm on one side;

Step (4) Control forging with special tool and die: For the blank forged to the size range of 700mm, the above-mentioned die is used for forging deformation; Step (4) utilizes the deformation principle of the law of least resistance of metal, and should be turned over to press and form;

The specific implementation steps of step (4) are as follows: when forging the blank forged to 700mm, make the end face of the blank close to the second side wall surface 3-1 of the special tool and die, and repeatedly press down by 120mm each time, and use the metal minimum. According to the deformation principle of the resistance law, the blank is forged to a thickness of 400mm to obtain an intermediate blank with a concave end face that meets the process requirements;

Step (5) tempering heating: formulate a reasonable heating temperature curve, carry out tempering heating treatment on the hot blank after forging in step (4), the heating temperature is 950 ° C, and the holding time is 200 minutes to obtain an intermediate blank;

Step (6) Forming and forging: the intermediate billet tempered and heated in step (5) is forged on a fast forging machine to obtain a finished billet of titanium and titanium alloy titanium strips without tongue and surface defects, as shown in Figure 10. Show. The slab used for the titanium strip without plate tongue should be basically flush with the head and tail end faces of the slab after forging, without sawing or the forging yield after head and tail sawing is not less than 98%.

In step (6), the size of the obtained titanium and titanium alloy titanium strip slabs is: thickness×width×length=250mm×1600mm×9000mm of titanium strip slabs.

Example 5

A method for free forging processing of near-net-shaped titanium strip slabs, which is specifically implemented according to the following steps:

Step (1) ingot preparation: peel the raw material titanium and titanium alloy ingots through the outer circumferential direction, remove the surface oxide scale and subcutaneous pore defects generated during the smelting process, and then carry out the flattening treatment on the head of the ingot to remove the smelting process For the coral-like molten tumor defect generated at the riser position of the middle ingot, then remove the end surface defects at the bottom of the ingot, and then round the head and tail of the ingot (see Figure 2);

The raw material titanium and the titanium alloy ingot used in the step (1) have a grade of TA3, a diameter of Φ1020mm, and a weight of 9000kg.

In step (1), the titanium and titanium alloy ingots used are secondary smelting by vacuum consumable arc method, and the diameter is Φ1200mm.

In step (1), the radius of the ingot head and tail fillet is R=18mm.

Step (2) ingot heating: scientific and reasonable process and heating curve should be adopted for ingot heating, so as to ensure uniform heating of ingot and realize the forging process. Heating the ingot according to a certain heating process;

In step (2), the ingot heating process is as follows: firstly, the temperature is raised from room temperature to 820° C., and the heating time is 160 minutes; then the temperature is kept at 830° C., and the heating time is 200 minutes; Incubate at 1030°C for 200 minutes.

Step (3) Billeting forging: transfer the heated ingot to the forging press, first lightly forge one to two times, and then increase the reduction for forging, and forge the heated ingot to a thickness of 800mm During the forging process, the blank is turned over, and the reduction is increased for forging. During the forging process, try to ensure that the upper and lower deformations are consistent, and finally control the thickness size within the range of 650mm;

In step (3), when the ingot is lightly pressed one to two times, the reduction is controlled at 40mm, and the reduction is further increased for forging, and the reduction is controlled at 90mm on one side;

Step (4) Control forging with special tool and die: For the blank forged to the size range of 650mm, the above-mentioned die is used for forging deformation; Step (4) utilizes the deformation principle of the law of least resistance of metal, and should be turned over to press and form;

The specific implementation steps of step (4) are: when forging the blank forged to 650mm, make the end face of the blank close to the second side wall surface 3-1 of the special tool and die, and repeatedly press down by 110mm each time, and use the metal minimum. According to the deformation principle of the resistance law, the blank is forged to a thickness of 350mm to obtain an intermediate blank with a concave end face that meets the process requirements;

Step (5) tempering heating: formulate a reasonable heating temperature curve, and perform tempering heating treatment on the hot billet after forging in step (4), the heating temperature is 920 ° C, and the holding time is 100 minutes to obtain an intermediate billet;

Step (6) Forming and forging: the intermediate billet tempered and heated in step (5) is forged on a fast forging machine to obtain a finished billet of titanium and titanium alloy titanium strips without tongue and surface defects, as shown in Figure 10. Show. The slab used for the titanium strip without plate tongue should be basically flush with the head and tail end faces of the slab after forging, without sawing or the forging yield after head and tail sawing is not less than 98%.

In step (6), the size of the obtained titanium and titanium alloy titanium strip slab blanks is: thickness×width×length=200mm×1500mm×6000mm of titanium strip slabs.

Claims (10)

1. A forging die for near-net-shaped titanium strip slabs, characterized in that it comprises a bottom plate (1), and one end of the bottom plate (1) is sequentially provided with a transition baffle plate (2) and The vertical baffle (3), the first side wall surface (2-1) of the transition baffle (2) and the second side wall surface (3-1) of the vertical baffle (3) are on the same side, and the first side wall surface ( 2-1), the second side wall surface (3-1) and the upper surface (1-1) are the contact surfaces between the mold and the blank; The first side wall surface (2-1) and the second side wall surface (3-1) are arc surfaces, the upper surface (1-1) of the first bottom plate (1) is a rectangular plane, and the first side wall surface (2-1) ) is smoothly connected to the upper surface (1-1) through the transition of the second side wall surface (3-1); a plurality of hoisting holes (4) are arranged on the side wall surface of the bottom plate (1). 2 . The forging die for near-net-shape titanium strip slabs according to claim 1 , wherein the radius corresponding to the curvature of the first side wall surface (2-1) is R=50-100 mm; the second side The radius R=3000～4000mm corresponding to the radian of the wall surface (3-1). 3. The forging die for a near-net-shape titanium strip slab according to claim 1, wherein the first side wall surface (2-1), the second side wall surface (3-1) and the upper surface ( The surface finish Ra of 1-1) is not greater than 3.2 μm; the thickness of the bottom plate (1) is not less than 200 mm; the thickness of the vertical baffle plate (3) is 200-400 mm. 4. The forging die of a near-net-shaped titanium strip slab according to claim 1, wherein the bottom plate (1), the transition baffle plate (2) and the vertical baffle plate (3) are all 5CrMnMo plates . 5. a free forging processing method of near-net-shaped titanium strip slab, is characterized in that, is specifically implemented according to the following steps: Step (1) ingot preparation: peel the raw material titanium and titanium alloy ingots through the outer circumferential direction, remove the surface oxide scale and subcutaneous pore defects generated during the smelting process, and then carry out the flattening treatment on the head of the ingot to remove the smelting process The coral-like molten tumor defect generated at the riser position of the middle ingot, and then the end face defects at the bottom of the ingot are removed, and then the head and tail of the ingot are rounded; Step (2) ingot heating: heating the ingot according to a certain heating process; Step (3) Billeting forging: transfer the heated ingot to the forging press, first lightly forge one to two times, and then increase the reduction for forging, and forge the heated ingot to a thickness of 800mm During the forging process, the billet is turned over, and the reduction is increased for forging. During the forging process, try to ensure that the upper and lower deformations are consistent, and finally control the thickness size within the range of 600-700mm; Step (4) Controlling forging by special tool and die: forging the billet in the size range of 600-700mm, using the die according to any one of claims 1-4 to carry out forging deformation; Step (5) tempering and heating: perform tempering and heating treatment on the hot billet after forging in step (4), the heating temperature is 900-950° C., and the holding time is 90-200 minutes to obtain an intermediate billet; Step (6) forming and forging: the intermediate billet tempered and heated in step (5) is forged on a fast forging machine to obtain finished billets of titanium and titanium alloy titanium strip slabs. 6. the free forging processing method of a kind of near-net-shape titanium strip slab according to claim 5, is characterized in that, the raw material titanium used in step (1) and titanium alloy ingot grades are TA1, TA2, TA3, TA4 or TA10. 7. the free forging processing method of a kind of near-net-shape titanium strip slab according to claim 5, is characterized in that, in step (1), the titanium and titanium alloy ingots used are through vacuum consumable arc method Secondary smelting, ingots with a diameter of Φ1000mm and above. 8 . The method for free forging of near-net-shaped titanium strip slabs according to claim 5 , wherein, in step (1), the radius of the head and tail fillets of the ingot is R=15mm～20mm. 9 . 9 . The free forging processing method of a near-net-shaped titanium strip slab according to claim 5 , wherein, in step (2), the ingot heating process is as follows: firstly, the temperature is raised from room temperature to 800-850° C. 9 . , the heating time is 150 to 180 minutes; then the temperature is kept at 800 to 850 ° C for 180 to 250 minutes; the temperature is then raised to 1000 to 1050 ° C, and the heating time is 180 to 250 minutes; ~250 minutes. 10. The free forging processing method of a near-net-shaped titanium strip slab according to claim 5, characterized in that, in step (3), when the ingot starts to be lightly pressed one to two times, the reduction is controlled at 30 ~50mm, and then increase the reduction amount for forging, and the reduction amount is controlled at 80 ~ 100mm on one side; the specific implementation steps of step (4) are: when forging the billet forged to 600 ~ 700mm, make the end face of the billet close to the special purpose At the second side wall surface (3-1) of the tool die, the blank is forged to a thickness of 300 to 400 mm by repeatedly pressing down 100 to 120 mm each time; in step (6), the obtained titanium and titanium alloy The size of the finished titanium strip slab is: thickness×width×length=180mm～250mm×1000mm～1600mm×5000mm～9000mm slab for titanium strip.

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