JP4919012B2 - Deployable side grinding machine and steel strip manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a band steel polishing device and a band steel manufacturing method, capable of achieving excellent straightness in a band saw and of enhancing working efficiency and yield. <P>SOLUTION: This developing type side face polishing machine pulls out band steel by rotating a band steel coil obtained by winding the band steel to perform heat treatment. Next, the band steel, in such a state that the band steel is not taken, is guided into the developing side face polishing machine 1 having a plurality of polishing heads 2, or the developing side face polishing machine 5 of which guide spans GS<SB>1</SB>, GS<SB>2</SB>, GS<SB>3</SB>are set at desired values, for example, GS<SB>1</SB>&gt;GS<SB>2</SB>&gt;GS<SB>3</SB>, thereby polishing the side faces of the band steel. The guide spans GS<SB>1</SB>, GS<SB>2</SB>, GS<SB>3</SB>are established based on the guide spans of other polishing heads and the meandering period of the band steel. <P>COPYRIGHT: (C)2008,JPO&amp;INPIT

Description

  The present invention relates to a deployable side polishing machine and a steel strip manufacturing method, and more particularly, to a technique for improving the manufacturing efficiency of the steel strip, the yield, and the quality of the steel strip and the band saw.

The band saw is formed by endless loop welding by welding the longitudinal ends of hardened band steel (hardness HV 400 to 600). This band saw is used for cutting wood or the like. In use, the band saw cuts wood or the like by rotating in a state where it is stretched over a driving pulley and a driven pulley.
FIG. 3B shows an outline of a conventional manufacturing process of the band steel before the band saw is cut. The conventional steel strip manufacturing process shown in the figure includes (1) heat treatment processes such as quenching and annealing, (2) side surface polishing process of the steel strip, (3) surface polishing process of the steel strip surface, and (4) inspection. Process. In the following description, the term “band steel side surface” refers to the side surface in the longitudinal direction of the band steel, and the term “band steel surface” refers to the surface in the longitudinal direction of the band steel.

  Among these, the side polishing process is a process for increasing the straightness of the band steel, and consequently the straightness of the band saw as the final product, by polishing the side surface of the band steel. The reason for performing this step is as follows. In other words, when the straightness of the band steel is poor, when the band saw as the final product is spanned between the driving pulley and the driven pulley and rotated, the band saw swings back and forth, and the cut surface of the cut wood or the like is cut. This is because it becomes worse (see FIG. 8). Therefore, in order to improve the ground surface, in order to increase the straightness at the stage of the steel strip before gear cutting, conventionally, the side surface of the steel strip using the rotary table type steel strip side surface polishing machine 91 shown in FIG. 9 is used. Polishing of F was performed.

  The steel strip side surface polishing machine 91 includes a rotary table 92 and a rotary body 93, and a grindstone is provided on an end surface of the rotary body 93. The steel strip coil C wound in a coil shape is placed sideways on the rotary table 92 so that the steel strip side surface F is on the top and bottom surfaces, and is rotated together with the rotary table 92 at a predetermined speed (maximum 20 rpm). At the same time, the grindstone is applied to the side surface F of the steel strip while rotating the rotating body 93 at a predetermined speed (maximum 480 rpm). As a result, the side surface F of the steel strip is flattened. In order to perform this polishing treatment, it is necessary to place the steel strip coil C on the turntable 92. Therefore, the steel strip coil C must have a weight and size that can be placed on the turntable 92.

However, assuming that the length of the steel strip sent to the conventional heat treatment step shown in FIG. 3B is Y (actually, the steel strip corresponding to the length Y weighs about 4 t), the length Y When the steel strip was wound as it was to form the steel strip coil C, the weight was too heavy (or the diameter was too large), and could not be placed on the turntable 92. Therefore, conventionally, after the heat treatment process is finished, the steel strip having a length of 0.5Y, which is half the length Y, is wound up to form two steel strip coils C1 and C2 and sent to the side polishing process. . That is, in the prior art, one steel strip coil C having a length Y at the start of the heat treatment process is replaced with two steel strip coils C1 and C2 having a length 0.5Y at the end of the heat treatment process. It was divided.
Therefore, this division work itself has a problem in terms of efficiency.

Moreover, when the two steel strip coils C1 and C2 are produced after the heat treatment process is finished, it is necessary to perform the subsequent side polishing process, the surface polishing process, and the inspection process twice, and the work efficiency is poor. There was a problem.
Furthermore, if the steel strip coil C is not tightly wound, there is a problem that there are many operations due to skill, such as an increase in bending even after polishing (see FIG. 8B).
Furthermore, there is a problem that unless the side surface of the steel strip coil C is aligned to some extent, the amount of polishing on the side surface of the steel strip increases and the yield of the steel strip deteriorates.
Moreover, the two places of the both ends of the longitudinal direction of the strip steel coil C become an unpolished part which cannot be grind | polished, and become a part which cannot be used when it is set as a final product. And when the process after a side surface grinding | polishing process becomes the strip steel coils C1 and C2 of length 0.5Y like the past, an unpolished part becomes a total of four places. Therefore, when the processes after the side polishing process are performed with the steel strip coils C1 and C2 having a length of 0.5Y, all processes (from heat treatment to inspection) can be performed at once with the steel strip coil C having a length of Y. There was a problem that the yield of the obtained steel strip was low compared with the case where it became.

Moreover, even if all the processes (from heat treatment to inspection) can be performed at once with a single steel strip of length Y without dividing the steel strip coil C into two, the linearity of the steel strip If it is not at least equal to or higher than that of the prior art, the ground skin (cut surface) when the cutting operation is performed using the band saw as the final product is deteriorated.
Therefore, when all the processes are carried out at once with a single Y-long steel strip coil, not only the working efficiency and yield are improved, but also the steel strip and the band saw as the final product while ensuring an appropriate amount of polishing. It must be possible to achieve a good linearity.
Furthermore, it is not desirable that the unpolished surface and the burnt after polishing remain on the concave surface of the side surface of the steel strip.

This invention is made | formed in view of the said situation, and the 1st objective of this invention makes favorable the linearity of a band saw and a band saw as a final product, ensuring an appropriate grinding | polishing amount. Another object of the present invention is to provide a deployable side polishing machine and a method for manufacturing a steel strip.
The second object of the present invention is to provide a development side grinder and a steel strip manufacturing method capable of improving working efficiency and yield.
The third object of the present invention is to provide an unfolded side polishing machine and a method of manufacturing a steel strip that can eliminate the unpolished surface of the steel strip and burn after polishing.

In order to solve the above-mentioned problem, a deployable side polishing machine according to the present invention is:
Two or more polishing heads are disposed at positions facing one side of the side surface of the steel strip when passing through the steel strip or at positions facing both sides, respectively.
The polishing head is
A first roller and a second roller for guiding the steel strip;
A grindstone for polishing the side surface of the steel strip located at a position deviated from a straight line contacting the tip of the first roller and the tip of the second roller;
The gist is that the guide span GS _n of the _n- th polishing head counted from the head (n is a natural number) satisfies the equation (1).
GS _n ≠ GS _m (where GS _m is the mth (m is a natural number, m ≠ n) guide span of the nth polishing head) (1)

In this case, it is desirable that the guide span GS _n satisfies the formula (2).
GS _n = GS _n−1 × s ₁ (where n ≧ 2, GS _n−1 is the guide span of the n−1th polishing head, 0 <s ₁ <1) (2) Formula In this case, It is desirable that the guide span GS _n satisfies the expression (3).
GS _n = GS _n−1 × s ₂ (where n ≧ 2, GS _n−1 is the guide span of the n−1th polishing head, 0.5 ≦ s ₂ ≦ 0.8) (3) In this case, it is desirable to provide a constant pressure polishing head that polishes the side surface of the steel strip while contacting the side surface of the steel strip with a constant pressure after the polishing head that finally contacts the side surface of the steel strip.

The steel strip manufacturing method according to the present invention includes:
Heat treatment is performed by pulling out the steel strip by rotating a steel strip coil obtained by winding the steel strip, and polishing the side surface of the steel strip without winding the steel strip after the heat treatment is completed. -Strip steel side polishing process,
The present invention includes a winding step of winding the steel strip to form a new steel strip coil after polishing of the side surface of the steel strip.

In this case, the heat treatment and strip steel side polishing step, after the heat treatment is finished, in a state where the strip steel is not wound up, the strip steel is introduced into any one of the above-described deployable side polishing machines, It is desirable to be a step of polishing the side surface of the steel strip.
Further, in this case, it is desirable that the guide span GS _n satisfies the formula (4).
GS _n = CS × (2k−1) (where CS is the meander period of the steel strip, k is a natural number) (4) Further, in this case, the first guide span GS ₁ counted from the top is (5 It is desirable to satisfy the formula.
GS ₁ = CS1 (where CS1 is the meandering period of the steel strip before the start of polishing) (5) Further, in this case, it is desirable that the guide span GS _n satisfies the expression (6).
GS _n ≠ CS × 2k (CS is the meandering period of the steel strip, k is a natural number) (6)

In the development type side polishing machine and the steel strip manufacturing method according to the present invention, the guide span GS _n of the _n-th polishing head is changed for each polishing head, that is, the guide span GS _n is _expressed by the formulas (1) to (3). Since either of the equations is satisfied, the straightness of the band steel and the band saw as the final product can be improved while ensuring an appropriate amount of polishing. In particular, when the expressions (2) and (3) are satisfied, the meandering period of the steel strip can be reduced every time polishing is performed, and accordingly, the straightness of the steel strip and the band saw as the final product can be further increased.

  In the steel strip manufacturing method according to the present invention, after the heat treatment of the steel strip is finished, the side surface of the steel strip is polished without winding the steel strip, and the polished steel strip is wound up to create a new Therefore, it is not necessary to divide the steel strip into two to make two steel strip coils. Therefore, according to the steel strip manufacturing method according to the present invention, all the steps may be performed once for one steel strip coil, and the side polishing step and subsequent steps are performed twice for the two steel strip coils as in the past. There is no need to do so, and work efficiency can be improved. Moreover, since it becomes unnecessary to divide the said steel strip into two and make it a steel strip coil, the unpolished part which was four places in total can be reduced to two places. Therefore, the yield of the band steel or the band saw as the final product can be increased.

  Since the strip steel manufacturing method according to the present invention is such that the guide span GS is an odd multiple of the meander period CS, that is, satisfies the formula (4) or (5), the polishing amount of the strip steel is optimized. It is possible to improve the linearity of the band steel and the band saw as the final product while ensuring an appropriate amount of polishing of the band steel. The steel strip manufacturing method according to the present invention avoids a situation in which the polishing head cannot polish the steel strip because the guide span GS is not an even multiple of the meandering cycle CS, that is, satisfies the formula (6). can do.

  The development-type side polishing machine according to the present invention can polish the steel strip in a state where it is not wound after heat treatment because the polishing head is disposed at a position facing the side surface of the steel strip when passing through the steel strip. Moreover, the work of deteriorating the yield, such as polishing the side surfaces of the steel strip to some extent in advance, becomes unnecessary. Therefore, according to the deployable side polishing machine according to the present invention, work efficiency and yield can be improved. Since the strip steel manufacturing method according to the present invention uses this unfolding side grinder, the same effect is obtained.

  The deployable side polishing machine according to the present invention includes a constant pressure polishing head that polishes the side surface of the steel strip while contacting the side surface of the steel strip at a constant pressure. Can be eliminated. Since the strip steel manufacturing method according to the present invention uses this unfolding side grinder, the same effect is obtained.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.
(Expandable side polishing machine)
FIG. 1 shows a schematic configuration of a deployable side polishing machine 1. The development-type side polishing machine 1 includes two or more polishing heads 2 arranged at positions facing one side of the band steel side surface F when passing the band steel, or respectively arranged at positions facing both sides, and similarly to them. And one or more constant pressure finishing heads 3 arranged. The number of polishing heads 2 is preferably two or more, and preferably three to four, but is not limited. The number of preferred constant pressure type finishing heads 3 may be one or more, and preferably two, but is not limited. In addition, the polishing head 2 and the constant pressure type finishing head 3 are preferably arranged at positions facing both sides of the side surface F of the steel strip when passing through the steel strip, but may be arranged only on one side. In addition, when the polishing head 2 and the constant pressure finishing head 3 are disposed at positions facing both sides of the side surface F of the steel strip when passing through the steel strip, it is desirable that the number of these is the same, but they are different. Good. Further, when the development-type side polishing machine 1 repeatedly performs polishing a plurality of times, or when a plurality of development-type side polishing machines 1 are connected to each other, it faces one side or both sides of the band steel side F when passing through the steel strip. One polishing head 2 may be disposed at each position.

The polishing head 2 includes a first roller R1 and a second roller R2, a grindstone 4, and a receiving roller R3. The polishing head 2 guides the steel strip while the first roller R1 and the second roller R2 sandwich the steel strip between the receiving roller R3.
Here, the “guide span GS” is a distance between the center of the first roller R1 and the center of the second roller R2. When two or more polishing heads 2 are arranged, the guide span of the _first polishing head 2 is set to GS _{1 in} order from the first polishing head arranged on the most upstream side with respect to the strip passing direction. The guide span of the second polishing head 2 is called GS ₂ ,..., N (n is a natural number), and the guide span of the second polishing head 2 is called GS _n . Further, the “meandering cycle CS” is a cycle in which the band steel just before being polished by the polishing head 2 meanders. The “meandering cycle CS1” is a cycle in which the steel strip meanders before the polishing of the side surface F of the steel strip, particularly, in the meandering cycle CS.

Next, how to determine the guide spans GS ₁ , GS ₂ ,..., GS _n will be described.
This guide span GS is
(Factor 1) Guide span GS of the other polishing head 2;
(Factor 2) It is desirable to determine an appropriate value based on the meander cycle CS.
Therefore, how to determine the guide span GS _n will be described on the assumption that two or more polishing heads 2 are provided at positions facing one side or both sides of the side surface F of the steel strip when passing through the steel strip.

First, the guide span GS may be changed for each polishing head 2 (Factor 1). That is, when there are a plurality of polishing heads 2, the guide span GS _n of one polishing head 2 may not be the same value as the guide span GS _m of the other polishing head 2, but may be a different value. Accordingly, the guide span GS _n of the n-th (n is a natural number) polishing head 2 can be determined so as to satisfy the expression (1).
GS _n ≠ GS _m (where GS _m is the mth (m is a natural number, m ≠ n) guide span of the nth polishing head) (1)

Secondly, the guide span GS is preferably made smaller from the first polishing head 2 to the last polishing head 2 (factor 1). That is, it is preferable that GS ₁ > GS ₂ >,...,> GS _n . Accordingly, the guide span GS _n of the n-th (n is a natural number) polishing head 2 can be determined so as to satisfy the expression (2).
GS _n = GS _n−1 × s ₁ (where n ≧ 2, GS _n−1 is the guide span of the n−1 th polishing head, 0 <s ₁ <1) (2), ie, n th The guide span GS _n is different from the previous (n−1) th guide span GS _n−1, and may be smaller than that. This is because the meander cycle CS can be gradually reduced every time polishing is performed.
The guide span GS _n that satisfies the formula (2) is preferably one that satisfies the following formula (3).
GS _n = GS _n−1 × s ₂ (where n ≧ 2, GS _n−1 is the guide span of the n−1th polishing head, 0.5 ≦ s ₂ ≦ 0.8) (3)

Third, the n-th guide span GS _n may be an odd multiple of the meander cycle CS (factor 2). Polishing head guide span GS _n is an odd multiple of meander period CS is because the polishing amount is large. Therefore, the guide span GS _n of the n-th (n is a natural number) polishing head 2 can be determined so as to satisfy the equation (4).
GS _n = CS × (2k−1) (where CS is the meandering period of the steel strip, k is a natural number) (4) Formula In particular, the guide span GS _n satisfying the formula (4) is expressed by the following formula (5) Those satisfying these conditions are preferred.
GS ₁ = CS1 (where CS1 is the meandering period of the steel strip before the start of polishing) (5) That is, the first guide span GS ₁ is the same as the meandering period CS1 of the steel strip before the start of polishing of the steel strip. I just need it.

Fourth, it is sufficient that the _nth guide span GSn is not an even multiple of the meander cycle CS (factor 2). This is because a polishing head in which the guide span GS _n is an even multiple of the meandering cycle CS cannot be polished. Accordingly, the guide span GS _n of the n-th (n is a natural number) polishing head 2 can be determined so as to satisfy the expression (6).
GS _n ≠ CS × 2k (CS is the meandering period of the steel strip, k is a natural number) (6)

Fifth, guide spans GS _{1 to} GS _n should be determined so as not to be divisors or multiples (factor 1 + factor 2) as much as possible. Although the polishing amount may be extremely good (Example 5 described later), the unpolished state (Example 1 described later) when the state of the formula (6) is accidentally formed is excluded in advance.

  In addition, it is desirable that the guide spans of all polishing heads satisfy the expressions (1) to (6) in relation to other guide spans or in relation to the meandering cycle, but not all guide spans are required. It does not have to satisfy the formula. This is because the meandering cycle is unclear because it changes slightly depending on the working state of the steel strip. Therefore, any one of the guide spans of all the polishing heads may satisfy any one of the expressions (1) to (6).

A preferred example is shown below. A steel strip to be polished is generally a steel type SKS5, a length of 500 to 1500 m, a plate thickness of 1 to 3 mm, and a width of 50 to 400 mm, but is not limited thereto. The meandering period is empirically 1 to 2 m. And three polishing heads 2 are arranged on both sides of the position facing the steel strip side face F when the steel strip passes (see FIG. 1). The guide spans GS ₁ , GS ₂ , and GS ₃ are GS ₁ = 2000 mm, GS ₂ = 1200 mm (0.6 times GS ₁ ), GS ₃ = 600 mm (0.5 times GS ₂ ), or GS ₁ = 1500 mm, GS ₂ = 800 mm (0.53 times GS ₁ ), GS ₃ = 500 mm (0.625 times GS ₂ ), GS ₁ = 1000 mm, GS ₂ = 600 mm (0.6 times GS ₁ ) , GS ₃ = 450 mm (0.75 times GS ₂ ).

  The grindstone 4 (see FIG. 2) is attached in the vicinity of the center between the first roller R1 and the second roller R2, and deviates from a straight line that contacts the tip of the first roller R1 and the tip of the second roller R2. The band steel side F located is ground. That is, the grindstone 4 grinds the steel strip side surface F that protrudes from the straight line toward the polishing head 2 side. Here, the grindstone 4 has a cup shape and is polished by a grinding surface formed on the end face of the cup. The grindstone 4 is advanced toward the steel strip side surface F when the Mo load continuously decreases from the reference for a certain period of time. This simplifies the grinding wheel wear correction.

  The constant pressure finishing head 3 shown in FIG. 1 has an unpolished surface when the band steel side surface F is bent concavely in the direction away from the polishing head 2, and therefore the unpolished surface is polished at a constant pressure. In addition, the constant pressure finishing head 3 removes the burns generated during the polishing of the portion already polished by the polishing head 2 by constant pressure polishing.

(Strip manufacturing system)
With reference to FIG. 3, the strip steel manufacturing system which concerns on one Embodiment of this invention is demonstrated. The band steel manufacturing system includes a heat treatment / band steel side surface polishing mechanism 5, a band steel surface polishing mechanism 6, and a band steel inspection line 7.
First, the heat treatment / band steel side surface polishing mechanism 5 rotates the band steel coil C (see FIG. 5C) obtained by winding the band steel to draw out the band steel and perform heat treatment (quenching, tempering, etc.). In addition, the side surface F of the steel strip is polished, and includes a heat treatment apparatus 8 and a deployable side polishing machine 1. When the heat treatment is completed, the heat treatment apparatus 8 sends the steel strip to the deployable side polishing machine 1 by a feed mechanism (not shown) without winding the steel strip. The unfolding side grinder 1 grinds the steel strip side surface F that is not wound after heat treatment. Conventionally, heat treatment and strip steel side surface polishing are performed as separate steps, but in the present embodiment, these are performed as one step.
The winding mechanism 9 winds the band steel after the band steel side surface F has been polished to form one new band coil C. When performing winding by the winding mechanism 9, it is not necessary to divide the steel strip into two to form two steel strip coils.

The surface polishing mechanism 2 sequentially pulls the steel strip from the steel strip coil C wound by the winding mechanism 9, polishes the steel strip surface P by the surface polishing machine 10, and starts the polished portion by the winding mechanism 9. Winding is performed sequentially, and the steel strip coil C is formed again.
The steel strip inspection line 7 pulls the steel strip from the steel strip coil C, feeds the steel strip with a feeding device (not shown), and winds it as the steel strip coil C with the winding device 6. While the steel strip is being sent, the steel strip is visually inspected by the operator.

(Strip manufacturing method)
Next, similarly, with reference to FIG. 3, a steel strip manufacturing method according to an embodiment of the present invention will be described. As shown in FIG. 1A, the steel strip manufacturing method includes a heat treatment / steel strip side surface polishing step, a strip steel surface polishing step, and a strip steel inspection step.
First, in the heat treatment and band steel side polishing step, the band steel is drawn by rotating the band steel coil C obtained by winding the band steel, and then the heat treatment is performed. It introduce | transduces into the expansion | deployment type side grinder 1, and the steel strip side F is grind | polished. Therefore, it is not necessary to divide the steel strip into two to form two steel strip coils. Therefore, it is only necessary to perform all the processes once for one band steel coil, and it is not necessary to perform the side polishing process and subsequent steps twice for the two band steel coils as in the prior art, and the working efficiency is improved. Moreover, since it becomes unnecessary to divide the said steel strip into two and make it a steel strip coil, the unpolished part which was four places in total can be reduced to two places. Therefore, the yield of the band steel or the band saw as the final product can be increased. Note that when performing this step, it is desirable to perform the grinding decide guide span GS _n to an appropriate value based on the equation (1) to (6).

  In the band steel surface polishing step, the band steel is pulled out by rotating the band steel coil C, the band steel is introduced into the surface polishing machine 10, the band steel surface P is polished, and when this is finished, the band steel is removed. Winding on coil C. In the steel strip inspection process, the steel strip C is pulled out by rotating the steel strip coil C, the steel strip is run, provided to the operator's visual inspection, and traveled an appropriate distance, and then wound around the steel strip coil C. take.

(Method of simulation test)
As shown in FIG. 4, it was assumed that a total of two polishing heads 2 were attached to the positions facing both sides of the side surface F of the steel strip when passing through the steel strip. And the fluctuation | variation (meandering amount) of the strip steel side surface F when it assumed that the grinding | polishing was performed 4 times with respect to the one side or both sides of the strip steel side surface F was confirmed by simulation. The meandering period CS1 before the simulation of the steel strip assumed for simulation was 2 m.

  Examples 1 to 4 shown in Table 1 are simulations of polishing performed four times (4 passes) with a constant guide span without changing the guide span. Example 5 shown in Table 2 The simulation is performed when the guide span is optimized for each pass and polishing is performed four times. 5 and 6 illustrate the results shown in Table 1 and Table 2, respectively. The “pass” refers to one unit of polishing of the steel strip. Specifically, it means that the steel strip travels a predetermined distance while being polished by the grindstone 4 between the polishing heads 2. “N pass” means n times of running and polishing of the steel strip.

The prerequisites for this simulation were as follows.
(1) The meandering path (vibration) is a constant sine waveform, and its period is defined as a meandering period CS.
(2) The contact position of the grindstone 4, the first roller R1 and the second roller R2 with the steel strip side surface F is linear, and the grindstone 4 is arranged at the center between the first roller R1 and the second roller R2. .
(3) The contact between the grinding wheel 4, the first roller R1 and the second roller R2 with respect to the steel strip side surface F is point contact, and the strip steel side surface F and the grinding stone 4 do not escape.

(Evaluation of simulation results-1)
Consider the results in Table 1.
First, the case where the polishing amount is maximized will be considered based on the shake after one pass in Examples 1 to 4. The shake after the first pass of Example 1 was the smallest value compared with the shake after the first pass of Examples 2-4. From this, it was found that the polishing amount of Example 1 was the largest. The guide span GS of the first embodiment is equal to the meander cycle CS (also referred to as CS1). Accordingly, it has been found that the polishing amount per time can be increased by setting the guide span GS to an odd number (one time) of the meandering cycle CS.

  Next, avoidance of a condition in which polishing cannot be performed at all will be considered based on the shake after the first to fourth passes in the first embodiment. The shakes after the first pass to the fourth pass in Example 1 all show a value of 0.5. This indicates that polishing was not possible at all in the second to fourth passes. The reason is that the difference between the first and second passes of the shake, the difference between the second and third passes, and the difference between the third and fourth passes are zero. is there. The relationship between the meander cycle CS and the guide span GS in these cases will be seen. In the first embodiment, the meander cycle CS of the second pass becomes smaller by the polishing of the first pass and becomes one half (that is, 1 m) of the meander cycle CS of the first pass. On the other hand, the guide span GS of the second pass in Example 1 is 2.0 m. Therefore, the guide span GS of the second pass in the first embodiment is twice (even times) the meander cycle CS of the second pass. From this, it was found that when the guide span GS is an even multiple of the meander cycle CS, polishing cannot be performed. Therefore, it has been found that the unpolished state can be avoided unless the guide span GS is an even multiple of the meander cycle CS.

  Furthermore, it is difficult to predict a specific numerical value of the meandering cycle CS, and the guide span GS may accidentally be an even multiple of the meandering cycle CS. Therefore, when two or more polishing heads 2 are provided on one side or both sides in the range of one pass, it has been found that if the guide span GS is changed for each polishing head 2, an unpolishing state can be avoided.

(Evaluation of simulation results-2)
Consider the results in Table 2.
In the fifth embodiment, the guide span GS is optimized for each pass, specifically, the guide span GS is set to one time the meander cycle CS (from the beginning, the guide span GS is equal to the meander cycle CS. It uses the fact that the meander cycle is half that when polished once). That is, the guide span GS is set to 2.0 m for the first pass (the meander cycle is 2.0 m) → 1.0 m for the second pass (the meander cycle is 1.0 m) → 0.5 m for the third pass (the meander cycle is 0.5 m) → 4th pass was 0.25 m (meandering period was 0.25 m). Thereby, the shake after each pass of Example 5 shown in Table 2 was smaller than the shake after each pass of Examples 1 to 4 shown in Table 1. That is, in Example 5, the polishing amount was maximized. It can be seen that the guide spans GS _{2 to} GS ₄ are each 0.5 times the previous guide spans GS _{1 to} GS ₃ . Guide span GS ₁ is 2.0m a meandering period CS1 before the start of polishing, the guide span _GS 2 _{~GS 4} is found to be in the range of 0.5 times the CS1 0.125 times.

From the results shown in Table 1 and Table 2,
(1) The guide span GS should be changed for each polishing head and gradually reduced as polishing is performed (Factor 1).
(2) It has been found that the guide span GS should be an odd multiple and not an even multiple of the meander cycle CS (factor 2).

(Method of polishing test for steel strip)
Next, a strip steel polishing test was conducted with the guide span GS set to an appropriate value satisfying the above equations, which will be described.
(Example 6)
As shown in FIG. 1, in order from the upstream direction in which the steel strip is sent, three (6 in total) polishing heads 2 are arranged at positions facing the steel strip side surface F when passing the steel strip. Two (4 in total) constant pressure type finishing heads 3 were arranged. At this time, the guide spans GS ₁ , GS ₂ , GS ₃ of the polishing head 2 were 1500 mm, 750 mm (0.5 times GS ₁ ), and 600 mm (0.8 times GS ₂ ). The steel strip was steel type SKS5, the length in the longitudinal direction was 100 m, the width in the short direction was 100 mm, and the thickness was 1.0 mm. About this steel strip, the bending (back value) before and after polishing was measured. The measurement results are shown in FIGS. The figure (a) shows the curve before grinding | polishing, and the figure (b) shows the curve after grinding | polishing. “Bend (back value)” means a small bend per unit length of the steel strip.

(Comparative example)
Polishing was performed using a conventional strip steel side polishing machine 91, and the bend (back value) after polishing was measured. The measurement result is shown in FIG.

(Evaluation of band steel polishing test)
When the back value after polishing in FIG. 7A according to Example 6 and the back value before polishing in FIG. 7B were compared, the back value after polishing was significantly smaller than the back value before polishing. This confirmed that polishing was possible. Next, when the back value after polishing in FIG. 10A according to Example 6 is compared with the back value after polishing in FIG. It was about 1 mm. Moreover, it turned out that Example 6 has a tendency that the back value as a whole is better than the comparative example. From the above, it was found that if the guide span GS is set so as to satisfy the above equations as in Example 6, the straightness of the steel strip equal to or higher than the conventional one can be obtained.

  Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment.

  The deployable side polishing machine and the steel strip manufacturing method according to the present invention are suitable for manufacturing a band saw as a final product in order to improve work efficiency and product yield and to improve the straightness of the steel strip. It is.

It is a schematic block diagram of the expansion | deployment type side surface grinder which concerns on one Embodiment of this invention. It is the external view which expanded and showed the grindstone. It is a figure which shows the strip steel manufacturing process etc. which concern on one Embodiment of this invention. It is a layout view of a polishing head assumed in a simulation test. It is a graph which shows the result of a simulation test. It is a graph which shows the result of a simulation test. It is the graph which measured the curvature (back value) after strip steel grinding | polishing. It is a comparison figure of a steel strip with a good straightness and a steel strip with a bad linearity. It is an external view of the conventional rotary table type steel strip side polishing machine.

Explanation of symbols

R1, R2, R3 1st roller, 2nd roller, receiving roller GS Guide span GS _n Guide span CS of n-th polishing head CS meander cycle CS of strip steel ₁ meander cycle C of strip before start of grinding strip C coil F Strip Steel Side P Strip Steel Surface 1 Deployable Side Polisher 2 Polishing Head 3 Constant Pressure Finishing Head 4 Grinding Wheel 5 Heat Treatment / Strip Steel Side Polishing Mechanism 6 Strip Steel Surface Polishing Mechanism 7 Strip Steel Inspection Line 8 Heat Treatment Equipment 9 Winding Mechanism 10 Surface Polishing machine

Claims (7)

Two or more polishing heads are disposed at positions facing one side of the side surface of the steel strip when passing through the steel strip or at positions facing both sides, respectively.
The polishing head is
A first roller and a second roller for guiding the steel strip;
A grindstone for polishing the side surface of the steel strip located at a position deviated from a straight line contacting the tip of the first roller and the tip of the second roller;
A development type side polishing machine characterized in that a guide span GS _n of an _n- th polishing head counted from the head (n is a natural number) satisfies the expressions (1) and (2).
GS _n ≠ GS _m (where GS _m is the mth (m is a natural number, m ≠ n) guide span of the nth polishing head) (1)
GS _n = GS _n−1 × s ₁ (where n ≧ 2, GS _n−1 is the guide span of the n−1 th polishing head, 0 <s ₁ <1) (2) The development-type side polishing machine according to claim 1 , wherein the guide span GS _n satisfies the formula (3).
GS _n = GS _n−1 × s ₂ (where n ≧ 2, GS _n−1 is the guide span of the n−1th polishing head, 0.5 ≦ s ₂ ≦ 0.8) (3) The polishing head according to claim 1 or 2 , further comprising a constant pressure polishing head that polishes the side surface of the steel strip while contacting the side surface of the steel strip at a constant pressure after the polishing head that finally contacts the side surface of the steel strip. Expandable side polishing machine. Followed by heat treatment pull the steel strip by rotating the strip coil obtained by winding a strip, after the heat treatment is finished, with no wound the steel strip, according to claim 1 wherein the steel strip Introducing into the expandable side polishing machine according to any one of to 3, heat treatment and band steel side polishing step for polishing the side of the band steel,
After the polishing of the side surface of the steel strip is finished, a winding step of winding the steel strip into a new steel strip coil;
A method for producing a steel strip, comprising: The strip steel manufacturing method according to claim 4 , wherein the guide span GS _n satisfies the formula (4).
GS _n = CS × (2k−1) (where CS is the meander cycle of the steel strip, k is a natural number) (4) The strip steel manufacturing method according to claim 4 or 5 , wherein the _first guide span GS1 counted from the top satisfies the formula (5).
GS ₁ = CS1 (where CS1 is the meander cycle of the steel strip before the start of polishing) (5) The strip steel manufacturing method according to any one of claims 4 to 6 , wherein the guide span GS _n satisfies the formula (6).
GS _n ≠ CS × 2k (CS is the meandering period of the steel strip, k is a natural number) (6)

Images