JP6052782B2 - Manufacturing method of joining member - Google Patents

Description

The present invention, when the rolled material continuously rolling or a heat treatment to the rolled material relates to the production how the junction member Ru used for bonding the rolled material and the service tail (dummy member).

Conventionally, product plate materials such as thin steel plates and thin titanium plates have been manufactured through a hot rolling process, a cold rolling process, an annealing process, and the like.
For example, in the hot rolling process, rolling is performed by a hot rolling mill, and the rolled material is reduced to a predetermined size, and then wound by a take-up reel to form a coil. This coil is conveyed to the cold rolling process which is the next process.

Next, the coil introduced into the cold rolling process is reverse-rolled by a cold rolling mill as shown in FIG. 1, and the rolled material is reduced to a plate thickness as a product plate material.
At this time, as shown in FIG. 4, the coil installed on the take-up reel is not usually automatically wound around the take-up reel. Pass it and wind it on the take-up reel for several turns. Then, after confirming that it is reliably wound on the take-up reel, the rolling speed is increased while gradually rolling down and rolling with a cold rolling mill, and the mode is switched to the automatic rolling mode. Then, after the rolling is in a stable state, automatic control such as sheet thickness and tension starts operation. Similar operations (manual passage of the rolled material, winding of the rolled material on the take-up reel) also exist in the annealing process and the surface treatment process.

  As is apparent from the above, in the cold rolling process, control is not performed at all until various automatic controls are operated, and in severe cases, rolling may not be performed. For this reason, the dimension of the tip of the rolled material (cold rolled tip) until the start of automatic control is completely different from the target dimension, and as a result, it becomes a non-standard product, that is, off-gauge and must be discarded. I do not get.

  For this reason, it is possible to prevent a reduction in rolling yield by rolling after joining extra length portions (called dummy materials, service tails, etc.) to the front end and tail end of the rolled material before cold rolling. ing. As a method for joining the service tail and the rolled material, welding is generally used from the viewpoint of work efficiency. Therefore, the service tail is made of the same material as the rolled material so that welding to the rolled material body is easy. The service tail is used repeatedly by removing it after the cold rolling is completed. However, the service tail is a consumable item, and in the case of an expensive material such as titanium, it is uneconomical to use a service tail made of the same titanium material as the rolled material.

  In order to avoid such inconvenience, for example, it is conceivable to use the technique disclosed in Patent Document 1. Patent Document 1 uses a joining member in which a titanium material and a stainless steel plate are overlapped and joined with a scissors, and using this joining member, a titanium plate as a rolled material and a service tail made of an inexpensive stainless steel plate, To connect.

JP-A-56-39107

  However, the joining member disclosed in Patent Document 1 has a side face that is difficult to handle, as disclosed in FIGS. For example, when passing through a cold rolling mill, it is necessary to ensure a gap between rolls more than necessary, or when winding around a deflector roll, troubles such as not being wound well may occur. In addition, since there is a step at the saddle joint, wrinkles may enter the inner circumference when winding the coil, and there may be a few defective laps on the inner circumference of the coil. It has become a difficult technology.

  Therefore, in view of the above problems, the present invention can reliably join the rolled material and the service tail when rolling after joining the service tail to the front end and the tail end of the rolled material before cold rolling. It aims at providing a manufacturing method of a joining member and a joining member.

In order to achieve the above-described object, the present invention takes the following technical means .

The manufacturing method of the joining member in the present invention is a plate-like second plate made of the same material as the service tail on the front and back surfaces of the first member made of the same material as the rolled material. A base material provided with members was prepared, and the base material was hot-rolled in the thickness direction to form a clad material in which the first member and the second member were integrated by metal bonding, and manufactured. The clad material is cut in the plate thickness direction along the longitudinal direction of the clad material with a dimension substantially the same as the plate thickness of the rolled material or service tail, and the central portion in the thickness direction of the cut clad material is cut in the horizontal direction. By doing so, a first member made of the same material as the rolled material and a second member made of the same material as the service tail are manufactured by metal bonding to produce a joining member. Features.

Preferably, a base material in which a third member is arranged between the first member and the second member is prepared, and the base material is hot-rolled in the thickness direction so that the first member is interposed through the third member. 1 member and not good when the second member forms a clad material integrated by metallic bond.

  By using the technique of the present invention, it is possible to reliably join the rolled material and the service tail when rolling after joining the service tail to the tip and tail ends of the rolled material before cold rolling.

It is a figure which shows the whole structure of the rolling mill (cold reverse rolling mill) used at a cold rolling process. It is the figure which showed typically the condition which connects a rolling material and a service tail, (a) shows the conventional method, (b) shows the method of this invention. It is the figure which showed the manufacturing method of the joining member of this invention. It is a figure for demonstrating the reason for using a service tail.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
In the following description, the description will be made with the cold reverse rolling of the rolled material W such as a titanium plate in mind. In the following description, the same parts are denoted by the same reference numerals. Their names and functions are also the same. Therefore, detailed description thereof will not be repeated.

  Product plate materials such as thin titanium plates are manufactured through a hot rolling process, a cold rolling process, an annealing process, and the like. In the hot rolling process, rolling is performed by a hot rolling mill, and the rolled material W made of a titanium material is reduced to a predetermined size, and then wound by the take-up reel 3 to form a coil. This coil is conveyed to the cold rolling process which is the next process. Here, the titanium includes not only industrial pure titanium such as JIS type 1 and JIS type 2, but also titanium alloys to which various additive elements are added for improving characteristics.

FIG. 1 shows a cold rolling mill 1 (cold reverse rolling mill) used in the cold rolling process. The cold rolling mill 1 includes a pair of upper and lower work rolls 4 for rolling the rolled material W and a pair of upper and lower backup rolls 5 that support the work rolls 4. Further, an unwinding reel 2 for unwinding the rolled material W and a take-up reel 3 for winding the rolled material W after rolling are provided.
In the cold rolling mill 1, the gap amount between the work rolls 4 can be changed based on a command from a control unit (not shown). Further, the work roll 4 can freely adjust the rotational speed based on a command from the control unit. On the exit side of the cold rolling mill 1, a thickness gauge (not shown) for detecting the thickness of the rolled material W is provided.

  In this cold rolling mill 1, the rolled material W that has been unwound from the unwinding reel 2 is rolled by the work roll 4, so that it is reverse-rolled into a product plate having a desired plate thickness, plate width, and plate crown. And is taken up by the take-up reel 3. Note that the type of the cold rolling mill 1 may be a single stand or a tandem stand, and the technique of the present invention described below is applicable as long as batch rolling is performed.

  By the way, as described in detail in “Problems to be Solved by the Invention”, in the cold rolling mill 1, the leading end of the rolled material W is wound around the unwinding reel 2, and preparations for starting rolling are performed. At this time, the tip portion is passed through each rolling stand by a manual operation by an operator, and is wound around the take-up reel 3 by several turns. Then, after confirming that it is surely wound around the take-up reel 3, the rolling speed is gradually increased while rolling by each rolling stand and the rolling speed is increased to switch to the automatic rolling mode. Then, after the rolling becomes stable, automatic control of sheet thickness, tension, and the like is started.

As is clear from this, in the cold rolling process, the leading end and the tail end of the rolled material W become off-gauge portions, which must be discarded. Since the situation at the tip and the situation at the tail end are substantially the same, the following description will be focused on only the tip.
In order to cope with the above-described situation, a method of proceeding with rolling is developed after connecting an inexpensive material plate, in other words, a material suitable for cost even if discarded, to the tip of the rolled material W. ing. The plate material connected to the tip is referred to as a service tail S, and a steel plate material that is less expensive than the rolled material W, which is a titanium material, is used. That is, the reduction in rolling yield is prevented by rolling after joining the extra length portions to the tip portions of the rolled material W before cold rolling.

  As shown in FIG. 2A, welding is generally used as a joining method of the rolled material W and the service tail S from the viewpoint of work efficiency. The material of the same quality as the rolled material W is used so that welding with the service material S is easy, and the service tail S is repeatedly used by being removed after the cold rolling is completed. However, the service tail S is a consumable item, and in the case of an expensive material such as titanium, it is uneconomical to use the service tail S made of the same titanium material as the rolled material W.

In order to avoid such an inconvenience, in the present embodiment, the first member 8 made of the same material as the rolled material W and the second member 9 made of the same material as the service tail S are metallicly connected. The joining member 7 integrated by the above is used.
As shown in FIG.2 (b), the joining member 7 of this embodiment has the 1st member 8 welded with the rolling material W which is a titanium material, and this 1st member 8 is comprised with a titanium material. And approximately the same width and thickness as the rolled material W. On the other hand, the joining member 7 has a second member 9 that is welded to the service tail S. The second member 9 is made of general steel or stainless steel, and has approximately the same width and thickness as the service tail S. have. The 1st member 8 and the 2nd member 9 are couple | bonded by the metal coupling | bonding. “Metallic bonding” means that a bonding interface in which dissimilar metals to be bonded are in close contact with each other at a metal structure level is formed. A state in which the rolled material W and the service tail S are increased to a value that does not break or divide is described. In the joining member 7, it can also be considered that the first member 8 and the second member 9 are solid phase diffusion joined.

The joining member 7 is used to connect the titanium plate that is the rolled material W and the stainless steel plate that is the service tail S.
Next, a preferred method for manufacturing the joining member 7 will be described with reference to FIG.
First, when manufacturing the joining member 7, as shown in FIG. 3, the 1st member 8 which is flat form and comprised with the same material (for example, titanium material) as the rolling material W is prepared. In addition, a flat plate-like second member 9 made of the same material as the service tail S (for example, general steel) is prepared. The plate shape (width, length) of the first member 8 and the plate shape of the second member 9 are substantially the same. The thickness of the first member 8 is approximately twice the thickness of the second member 9.

  On that basis, the second member 9 is disposed so as to be laminated on the front surface and the back surface of the first member 8, and this is used as a base material. After that, the original material is heated to about 830 ° C. and hot-rolled in the thickness direction so that the “final total reduction ratio (reduction ratio) is 2 or more (50% or more)”. The clad material 6 in which the first member 8 and the second member 9 are integrated by metal bonding is formed. For rolling, a hot rolling mill (not shown) provided with a pair of work rolls is used.

The clad material 6 produced by hot rolling with a hot rolling mill has substantially the same dimension as the thickness of the rolled material W or service tail S to be connected along the longitudinal direction of the clad material 6. Cut in the thickness direction. This is a cutting corresponding to “strip cutting” in cooking.
The clad material 6 that has been cut is cut in the horizontal direction at substantially the center in the thickness direction. By joining in this manner, the first member 8 made of the same material as the rolled material W and the second member 9 made of the same material as the service tail S are integrated by metal bonding. The member 7 can be manufactured.

  In order to manufacture the joining member 7 having a stronger metallic bond, an insert member (third member) is provided between the first member 8 and the second member 9 for improving the diffusion joining strength of both members. ) Is preferred. As an insert member, for example, titanium (first member 8) and general steel (second member 9) or titanium (first member 8) using Cr-based stainless steel that does not contain Ni, Mo or the like such as SUS410 and SUS430. ) And stainless steel other than Cr (second member 9) is improved.

  Further, the higher the reduction ratio when manufacturing the bonding member 7 by the rolling cladding method, the higher the bonding strength. However, since the manufactured cladding material 6 is cut in the thickness direction as described above to form the bonding member 7, the cladding material The thickness 6 is the length when used as the joining member 7. Therefore, when the thickness of the clad material 6 is thin, the length when used as the joining member 7 is insufficient, and therefore it is necessary to set a reduction ratio and a clad dimension for obtaining necessary joining strength and dimensions.

By manufacturing the joining member 7 of this embodiment with the above-described manufacturing method, there is an advantage that a large amount of the joining member 7 can be collected at a time.
Finally, based on FIG. 4, the rolling method of the rolling material W which connected the service tail S using the above-mentioned joining member 7 is described. Titanium material is considered as the rolled material W, and general steel is assumed as the service tail S.

First, the joining member 7 is manufactured by the manufacturing method described above. One side (first member 8) of the manufactured joining member 7 is titanium, and the other side (second member 9) of the manufactured joining member 7 is general steel or stainless steel.
Prior to cold rolling of the rolled material W, the tip of the rolled material W and the end of the first member 8 of the joining member 7 are welded together and the end of the second member 9 of the joining member 7 is service tail S. And the service tail S is joined to the tip of the rolled material W. Similarly, the tail end portion of the rolled material W and the end portion of the first member 8 of the joining member 7 are jointly welded, and the end portion of the second member 9 of the joining member 7 is jointly welded with the service tail S, The service tail S is also joined to the tail end of the rolled material W.

  An inexpensive metal material is selected as the service tail S. However, if stainless steel or the like is used as the service tail S, it has excellent heat resistance and acid resistance. Since a certain pickling and annealing process can be passed through while being joined to the titanium coil body, the number of weldings can be minimized. Moreover, since the joining member 7 itself is excellent in heat resistance and acid resistance because the first member 8 and the second member 9 are metallicly bonded, the pickling process and annealing process, which are steps before and after the cold rolling process. The process can also be passed through while being joined to the rolled material W.

Moreover, the welding method of the joining member 7 and the rolling material W, and the welding method of the joining member 7 and the service tail S are not specifically limited, What is necessary is just to use a suitable thing according to the plate | board thickness and material type to weld. For example, if the plate thickness is 4 mm, TIG welding may be employed, and if the plate thickness is 1.5 mm, seam welding may be employed. Regarding the number of times of welding, conventionally, in order to weld the service tail S to each of the tip end portion and tail end portion of the rolled material W, each one-time welding has been carried out. When the increase in the number of weldings that requires two weldings affects the productivity of the welding line, measures such as pre-welding the joining member 7 and the service tail S in separate steps may be performed.

  After that, as shown in FIG. 4, the rolled material W to which the service tail S is connected using the joining member 7 is manually passed by an operator, and passes between the work rolls 4 of the cold rolling mill 1, deflour, etc. The service tail S is wound around the take-up reel 3 by several turns. Then, after confirming that it is reliably wound on the take-up reel 3, the rolling operation is gradually performed while rolling by the cold rolling mill 1 and the rolling speed is increased to start rolling.

  In rolling, the service tail S can be selected from general steel and stainless steel as appropriate. The merit of using stainless steel that is more expensive than general steel as the service tail S is its corrosion resistance and heat resistance. Specifically, in the case of stainless steel, the pickling and annealing processes, which are the processes before and after titanium cold rolling, can be passed, so that the service tail S can be joined to the titanium coil body only once. . Since the corrosion resistance and heat resistance of stainless steel are basically determined by the amount of added elements (cost), an appropriate material may be used in consideration of the balance between the material cost of stainless steel and the number of uses as the service tail S.

In addition, the service tail S is required to have a length that allows the winding of the coil to be sufficiently stable by being hung on a reel during cold rolling while keeping the thickness and width of the coil as large as possible.
The longer the coil winding stability, the better. However, since the material cost of the service tail S itself increases in proportion to the length, it is necessary to set an appropriate length according to the results of the cold rolling mill 1 to be applied. There is.

  By performing the rolling as described above, it is possible to use general steel or stainless steel, which is difficult to weld due to the formation of brittle intermetallic compounds in welding with a rolled material W made of titanium, as a service tail S. Can be cold rolled economically and with a good yield even in a batch system. Further, the service tail S is wound around the take-up reel 3 of the cold rolling mill 1, rolling is started from the welded portion of the joining member 7 and the rolled material W, and rolling is stopped at the welded portion at the tail end of the rolled material W. The rolled material W can be cold-rolled from the most advanced to the most extreme end as much as possible. In addition, if it rolls from the welding part of the joining member 7 and the rolling material W, the titanium side of the cladding material 6 will become thin, and it is not suitable for repeated use. Therefore, it is desirable to start rolling and stop rolling from a position (depending on the rolling roll diameter, which is about 50 to 200 mm) at a distance from the welded portion to the titanium coil body side.

By doing so, the amount of material loss at the off-gauge that is inevitably generated in the cold rolling process can be reduced as much as possible, leading to an improvement in product yield, that is, efficient production. it can.
As described above, the joining member 7 according to the present invention ensures that the rolled material W and the service tail S are securely rolled when the service tail S is joined to the tip and tail ends of the rolled material W before cold rolling. Can be joined. Further, by using the joining member 7 according to the present invention, the service tail S can be made of a general steel or stainless steel having a strength lower than that of titanium and equal to or higher than titanium, not an expensive material such as titanium. . By sandwiching the joining member 7 of the present invention between the rolled material W (titanium) and the service tail S (general steel or stainless steel), the rolled material W and the first member, and the service tail S and the second member, It becomes possible to join each type of metal alloy by welding.

  Moreover, the manufacturing method of the joining member 7 which concerns on this invention is arrange | positioned so that the 2nd member 9 may be laminated | stacked on the surface and back surface of the 1st member 8, and the clad diffusion-bonded by hot-rolling the base material A material 6 is formed. The clad material 6 is cut in the longitudinal direction of the clad material 6 and the substantially central portion in the thickness direction of the cut clad material 6 is cut in the horizontal direction. By doing so, the joining member 7 of the present invention can be manufactured easily and in large quantities.

The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. In particular, in the embodiment disclosed this time, matters that are not explicitly disclosed, for example, operating conditions and operating conditions, various parameters, dimensions, weights, volumes, and the like of a component deviate from a range that a person skilled in the art normally performs. Instead, values that can be easily assumed by those skilled in the art are employed.

DESCRIPTION OF SYMBOLS 1 Cold rolling mill 2 Unwinding reel 3 Take-up reel 4 Work roll 5 Backup roll 6 Clad material 7 Joining member 8 1st member 9 2nd member S Service tail W Rolled material

Claims (2)

A method for manufacturing a joining member that connects a rolled material and a service tail that follows the end of the rolled material,
Prepare a base material having a plate-like second member made of the same material as the service tail on the front and back surfaces of the first member made of the same material as the rolled material,
By hot rolling the base material in the plate thickness direction, a clad material in which the first member and the second member are integrated by metallic bonding is formed,
The produced clad material is cut in the plate thickness direction along the longitudinal direction of the clad material, with approximately the same size as the plate thickness of the rolled material or service tail,
By cutting the substantially central part in the thickness direction of the cut clad material in the horizontal direction,
A joining member produced by integrating a first member made of the same material as the rolled material and a second member made of the same material as the service tail by metal bonding. Manufacturing method of member. Preparing a base material in which a third member is disposed between the first member and the second member;
By hot rolling the source material in the thickness direction, according to claim 1 in which the first member through the third member and the second member and forming a clad material integrated with a metal binding The manufacturing method of the joining member of Claim 2.