JP7452067B2 - Cutting equipment and cutting method - Google Patents

Description

The present invention relates to a cutting device and a cutting method, and more particularly to a cutting device and a cutting method for removing the surface layer of a bar made of a metal material by cutting.

BACKGROUND ART It is required to remove scratches and scale such as oxides from the surface layer of bars made of metal materials such as steel bars. Therefore, in order to remove the structure of the surface layer of the bar, peeling treatment is generally performed.

When performing a peeling process on a bar, the cutting edge of the cutting tool is brought into contact with the surface of the bar, and the surface tissue is removed while rotating the cutting tool around the axis of the bar. A cutting tool used for this type of peeling process is disclosed in Patent Document 1, for example.

Japanese Patent Application Publication No. 2007-307637

When peeling is performed by rotating the cutting tool around the axis of the bar, it is necessary to maintain the rotating cutting tool in contact with the outer peripheral surface of the bar. Further, it is necessary to firmly position the bar in the direction intersecting the axis. At this time, if the bar has a bend, it becomes difficult to rotate the cutting tool while stably contacting the outer peripheral surface of the bar or to position the bar. Therefore, when a long bar is wound into a coil, the bends in the bar are first removed, and then the peeling process is performed on the straightened bar.

In this way, when peeling a long bar wound into a coil after removing the bend, the productivity of the bar decreases due to the process required to remove the bend. It becomes low. If it is possible to remove the surface layer of a bar that is still bent, it will be possible to continuously remove the surface layer of the long bar that is unwound from the coil. It is expected that productivity will improve. In addition, as mentioned above, when peeling is performed by rotating a cutting tool around the outer periphery of a bar from which bends have been removed, the bar must be firmly fixed, and contact with the fixing tool may cause the bar to peel. Since scratches occur on the surface, it is necessary to remove the surface tissue by peeling to a depth that allows the scratches to be removed. However, if the surface tissue can be removed from a bent bar without firmly fixing it, the amount of metal material to be removed can be reduced.

In addition, after removing the surface layer of the long bar material wound into a coil, it is wound again into a coil and transferred to equipment for the next process such as wire drawing. If the bar is transported, new scratches may be formed on the surface of the bar during winding or transport. This makes it difficult for the surface with few scratches obtained by removing the surface layer to be reflected in the quality of the final bar-shaped product.

The problem to be solved by the present invention is to fix the surface layer of a bar made of a metal material while retaining its bend and while avoiding the formation of scratches during fixation and winding of the bar. It is an object of the present invention to provide a cutting device and a cutting method that can remove .

In order to solve the above problems, a cutting device according to the present invention includes: a skin cutting section that performs skin cutting to remove the surface layer of a curved bar made of a metal material using a cutting tool; and a power unit that moves the bar material along the axial direction through the skinning section, and the bar material has been skinned by the skinning section and is made into a bar-shaped product without applying any bending. In the cutting device, the skin cutting portion increases the length along the circumferential direction of the bar without rotating the cutting tool around the axis of the bar while the bar remains bent. The motive power section continuously moves the bar material along the axial direction.

Here, it is preferable that the power unit moves the bar by making surface contact with the bar. In this case, the power unit may be a chain conveying device that sandwiches the bar from opposite directions between a pair of roller chains and sends the bar along the axial direction by movement of the roller chains. Moreover, the said power part is good to be provided downstream from the said skin cutting part.

The cutting device may further include a correction section that corrects the bending of the bar material downstream of the skin cutting section and the power section.

In the cutting method according to the present invention, a bar made of a metal material is introduced into the skin cutting section in a bent state using a cutting device such as that described above, and skin cutting is performed.

The cutting device according to the above invention performs skin cutting on a region having a length along the circumferential direction of the bar without rotating the cutting tool around the axis of the bar, as the skin cutting part for removing the surface layer. Because it is performed simultaneously, unlike when skinning is performed with a cutting tool that rotates around the axis of the bar, it is not necessary to keep the bar straight or firmly fixed. Therefore, the surface layer portion of a bent bar such as a bar unwound from a coil can be removed even if the bar remains bent. Since there is no need to firmly fix the bar material, it is possible to avoid scratches caused by fixation.

In this way, when performing skin cutting without rotating the cutting tool around the axis of the bar, if there is a stagnation in the movement of the bar by the power part, the cutting tool may come into contact with the bar when the movement stagnates. Excessive surface tissue of the bar will be removed in the areas where it is removed, causing scratches. However, by having the power unit move the bar continuously without stagnation, it is possible to avoid the occurrence of scratches due to such stagnation. Therefore, a bar-shaped product having a surface with few scratches can be manufactured through skin cutting by the skin cutting section. Furthermore, in order to make a bar-shaped product without applying any bending, such as winding the bar material that has been skinned by the skinning section into a coil shape, we perform a winding process and a transportation process for the rolled bar material. The formation of new scratches can also be avoided.

Here, if the power section moves the bar by surface contact with the bar, it is necessary to prevent scratches from being formed on the surface of the bar due to contact with the constituent members of the power section. can do. As a result, in addition to the effect of avoiding the occurrence of scratches due to stagnation of movement of the bar as described above, it is possible to effectively reduce scratches on the surface of the bar-shaped product.

In this case, if the power unit is a chain conveying device that pinches the bar material from opposite directions between a pair of roller chains and sends the bar material along the axial direction by the movement of the roller chains, a simple configuration is possible. Depending on the configuration, it can be used as a power unit that makes surface contact with the bar and continuously moves the bar.

Additionally, when the power section is installed downstream of the skinning section, buckling occurs in the bar introduced into the skinning section, unlike when the power section is installed upstream of the skinning section. It becomes difficult to do.

When the cutting device further includes a straightening section for correcting the bending of the bar material downstream of the skinning section and the power section, the skinning section is performed using the skinning section while the bar material remains bent. Also, the bar-shaped product finally produced by the cutting device can be in a state without bending.

In the cutting method according to the above invention, since the skin cutting is performed by a cutting device having the skin cutting part and the power part as described above, even if the bar introduced into the skin cutting part has a bend, the skin cutting It is possible to efficiently scrape the skin and manufacture bar-shaped products while avoiding the occurrence of scratches caused by. It is also possible to avoid the formation of scratches due to fixing and winding of the bar.

1 is a diagram schematically showing a cutting device according to a first embodiment of the present invention. It is a figure showing an outline of a cutting device concerning a second embodiment of the present invention. FIG. 1 is a diagram schematically showing a conventional combined machine. It is a figure which shows the time change of the moving speed of the bar by a power part, (a) shows the case of a chain conveyance device, (b) shows the case of a carriage type conveyance device.

Below, a cutting device and a cutting method according to an embodiment of the present invention will be described with reference to the drawings. A cutting device according to an embodiment of the present invention is a device that performs skin cutting to remove the surface layer of a bar made of a metal material, and a cutting method according to an embodiment of the present invention uses such a cutting device. , for cutting the skin of bars.

In the cutting device and the cutting method according to the embodiment of the present invention, the object to be processed is a long bar made of a metal material. Although the target metal material is not particularly limited, a steel bar made of stainless steel or the like can be exemplified. Generally, the outer diameter of a steel bar is 5 mm or more, and in the cutting apparatus and cutting method according to the embodiments of the present invention, bars having an outer diameter of 5 mm or more are assumed to be processed.

1. First Embodiment First, a cutting device 1 according to a first embodiment of the present invention and a cutting method using the same will be described.

[Overview of cutting equipment]
FIG. 1 schematically shows a cutting device 1 according to a first embodiment of the present invention. The cutting device 1 performs a cutting process on the bar B while moving the bar B in a movement direction D along the axial direction from upstream to downstream. The cutting device 1 has a skin cutting section 30 as a device for cutting the bar B. In the skinning section 30, skinning is performed to remove the surface layer of the bar B by cutting, thereby removing scratches formed on the surface layer and scales such as oxides. Further, the cutting device 1 includes a chain conveying device 40 downstream of the skin cutting section 30 as a power section that moves the bar material B in the moving direction D.

It is preferable that the cutting device 1 includes various elements that assist in processing and moving the bar B in addition to the skin cutting section 30 and the chain conveying device 40 described above. The elements included in the cutting device 1 of the form shown in FIG. 60, a roll correction section 70, and a material collecting section 80.

In the cutting device 1, the bar B is moved from upstream to downstream in a moving direction D along the axial direction by the chain conveying device 40. The bar B, which is wound into a coil and arranged in the material supply section 10 in a bent state, passes through each part of the cutting device 1 by the power of the chain conveying device 40 and undergoes processing.

The chain conveyance device 40 is also referred to as a chain track, and a pair of roller chains 41, 41 are arranged vertically facing each other. The roller chains 41, 41 are rotationally driven by a pair of sprockets 42, 42, respectively. When the chain conveyance device 40 is installed in the cutting device 1, the pair of roller chains 41, 41 face each other with the bar B interposed therebetween, and make surface contact with the bar B from above and below in the direction of gravity, respectively. With the bar B sandwiched between the pair of roller chains 41, 41 in this manner, the roller chains 41, 41 are rotated by the sprockets 42, 42. The rotation direction of the roller chains 41, 41 is set so that the surface in contact with the bar B moves from the upstream side to the downstream side in the moving direction D. Due to the movement of the roller chains 41, 41, the bar B is moved along the moving direction D and passes through each element of the cutting device 1, including the skin cutting section 30. Since the roller chains 41, 41 rotate continuously, the chain conveying device 40 moves the bar B continuously without interruption, that is, along the moving direction D without stopping in the middle. It can be moved downstream. The conveying speed of the bar B by the chain conveying device 40 may be set so that the peeling section 30 can perform skinning under good conditions. For example, 80-120m/min. A suitable conveyance speed can be mentioned as follows.

In the material supply section 10, the bar material B is passively fed out by the feeding operation by the chain conveying device 40. In the pre-straightening section 20 provided downstream of the material supplying section 10, the bending of the bar material B that has been wound into a coil in the material supplying section 10 is partially straightened to the extent that it can be shaved in the skinning section 30. to be resolved. In the preliminary straightening section 20, the bending of the bar B is reduced by passing the bar B between a plurality of preliminary straightening rolls 21 provided oppositely. The degree of bend reduction by the preliminary straightening section 20 is lower than the degree of bend reduction by the roll straightening section 70, which will be described later, and the bend remains in the bar B at the stage of introduction into the skinning section 30. . In addition, in the case where the skin cutting section 30 can perform skin cutting on the bar B that is largely bent, the preliminary straightening section 20 may be omitted.

The bar B, which has been partially corrected for its bending in the preliminary correction section 20, is introduced into the skinning section 30 by the chain conveyance device 40. The skin cutting section 30 performs skin cutting to remove scratches and scale formed on the surface layer of the bar B by cutting the structure of the surface layer of the bar B using the cutting tool 31 . The cutting tool 31 performs skin cutting on the bar B that moves in the movement direction D without rotating around the axis of the bar B. Further, the cutting tool 31 is configured to perform skin cutting on a region having a length along the circumferential direction of the bar B, preferably on the entire circumference of the bar B at the same time. A suitable example of such a cutting tool 31 is a cutter such as a milling cutter. The skinning section 30 is provided with a skinning die 32 that allows the bar B to pass therethrough, and on the inner circumferential surface of the skinning die 32 that accommodates the bar B, along the circumferential direction of the bar B. Preferably, a cutting tool 31 such as a milling cutter may be provided surrounding the entire circumference of the bar B.

The bar B that has been skinned by the skinning section 30 continues to pass through each element provided downstream of the skinning section 30 by power applied along the movement direction D from the chain conveying device 40. , undergo processing. Specifically, the bar B that has been skinned by the skinning section 30 is cut into a predetermined length along the axial direction by the cutting section 50 having a cutting blade while being transported by the chain conveying device 40. is cut off.

The cut bar B is straightened by a straightening section consisting of a polishing straightening section 60 and a subsequent roll straightening section 70, and is made into a straight bar shape. In the polishing correction section 60, the intermediate nozzle 62 performs shape correction while the polishing disk 61 performs surface polishing. The roll straightening unit 70 has two sets of an upper roll 71 and a lower roll 72 facing each other along the moving direction D, and a bar B is passed between each upper roll 71 and lower roll 72. By doing so, the bending of the bar B is strongly corrected.

In this way, the bar-shaped products B1 manufactured through shaving, cutting, and straightening the bar B are accumulated in the wood collecting section 80, and a plurality of bar products B1 are collected together and bound by the bundling member b. The accumulated bar-shaped products B1 are appropriately shipped or processed in the next process. An inspection section (not shown) consisting of an eddy current flaw detector or the like is provided between the roll straightening section 70 and the material collecting section 80, as appropriate, in order to inspect the bar B for the presence of flaws, dimensions, bending, etc. Good too.

In the cutting device 1 according to the present embodiment, the bar B is not further bent after being subjected to skin cutting in the skin cutting section 30 . In this respect, the present cutting device 1 is distinguished from a wire cutting device that cuts the skin of a wire rod, which is a metal material having a smaller diameter than a bar material. In a wire rod cutting device, a wire rod wound into a coil shape is stretched into a wire shape and subjected to processing such as skin cutting, and then the wire rod is wound again into a coil shape. On the other hand, in the cutting device 1 according to the present embodiment that processes the bar material B, the bar material B and the bar-shaped product B1 are cut into a coil shape after being subjected to skin cutting in the skin cutting section 30. No bending is applied, such as rewinding, to increase the bending along the axial direction. Rather, the bending is reduced by the polishing straightening section 60 and the roll straightening section 70.

[Construction of cutting equipment based on conventional equipment]
The cutting device 1 according to the first embodiment of the present invention described above is a conventional general combined machine ( It can be easily constructed based on CM (multi-tasking machine).

FIG. 3 shows an example of the configuration of a conventional combined machine 100. Components common to those of the cutting device 1 according to the first embodiment of the present invention shown in FIG. 1 are designated by the same reference numerals. The combined machine 100 includes, from the upstream side along the moving direction D of the bar material B, a material feeding section 10, a pre-straightening section 20, a shot blasting section 95, a wire drawing section 90, a carriage type conveying device 140, a cutting section 50, and a polishing section. It has a correction section 60, a roll correction section 70, and a material collection section 80.

In the combined machine 100, a carriage-type conveying device 140 is provided as a power unit that moves the bar material B along the moving direction D. The carriage type transport device 140 has a pair of carriages 141a and 141b. Each carriage 141a, 141b has a jaw (not shown) that grips the bar B from a plurality of directions on the outer peripheral surface using a claw-like member. The carriages 141a and 141b are capable of reciprocating movement within a predetermined movable range along the moving direction D of the bar B (movement m1). By gripping the bar B on one side of the carriages 141a and 141b and moving the carriage downstream along the moving direction D, the bar B can be moved downstream along the moving direction D. . The pair of carriages 141a and 141b are arranged side by side along the moving direction D. When one carriage 141a grips the bar B and moves to the most downstream of the movable range, it releases its grip on the bar B, moves to the most upstream of the movable range, and grips the bar B again. While the carriage 141a moves upstream without gripping the bar B, the other carriage 141b grips the bar B and moves downstream. In this way, the pair of carriages 141a and 141b alternately grip the bar B and move it downstream.

The shot blast section 95 removes oxides and the like on the surface of the bar material B by shot blasting using an abrasive. The wire drawing section 90 reduces the diameter of the bar B and draws it using a wire drawing die.

In such a combined machine 100, the first embodiment of the present invention described above can be achieved by replacing the wire drawing section 90 with the skinning section 30 and replacing the carriage type conveyance device 140 with the chain conveyance device 40. A cutting device 1 according to the present invention can be constructed.

When constructing the cutting device 1, it is possible to leave the wire drawing part 90 as in the cutting device 2 according to the second embodiment described below, but in the cutting device 1 according to the present embodiment, The wire drawing part 90 is not left. By drawing wire on the bar B, the density of impurities such as oxides and damage such as scratches on the surface of the bar B is reduced, and the influence of impurities and damage on the manufactured bar product B1 is reduced. be able to. On the other hand, when wire drawing is performed on the bar B, there is a possibility that changes in properties such as work hardening may occur due to diameter reduction. JIS G 4303, which defines standards for stainless steel bars, allows pickling and cutting to remove black scales on the surface, but does not allow wire drawing. In the cutting device 1 according to the present embodiment, the wire drawing section 90 is not provided, giving priority to avoiding work hardening due to wire drawing. In the cutting device 1 according to the present embodiment, impurities and damage on the surface can be sufficiently removed by the skinning section 30, and when the bar B is transported by the chain transport device 40, as will be explained in detail later. In addition, since there is a low possibility that new scratches will be formed on the bar B, there is no problem even if the wire drawing section 90 is omitted from the viewpoint of reducing the density of impurities and damage on the surface. Since the structure of the surface layer of the bar B is cut and removed in the skin cutting section 30, the shot blasting section 95 provided upstream of the wire drawing section 90 can also be omitted.

[Form of skin cutting by the skin cutting section and movement of bar material by the power section]
As described above, in the skin cutting section 30 of the cutting device 1 according to the present embodiment, the cutting tool 31 can cut the bar B without rotating around the axis of the bar B passing through the skin cutting section 30. Along the circumferential direction, skin cutting is simultaneously performed on a region having a length such as the entire circumference. By using such a skinning section 30, skinning can be performed even if the bar material B fed out from the coil by the material feeding section 10 remains in a bent state.

When cutting is performed by rotating a cutting tool that cuts one circumferential location of the bar B around the axis of the bar B, such as the cutting tool disclosed in Patent Document 1, In order to cut with high uniformity along the circumferential direction of bar B, the cutting tool must be in contact with the outer peripheral surface of bar B under the same conditions (angle, depth, etc.) while the cutting tool rotates. It is important to maintain the If the bar B has a bend, the conditions under which the cutting tool contacts the surface of the bar B may change depending on the position along the circumferential direction. Furthermore, there is a possibility that the cutting tool will separate from the surface of the bar B. Therefore, it is necessary to correct the bending of the bar material B to make it into a straight bar shape, and then perform skinning.

On the other hand, when the cutting tool 31 is not rotated like the skin cutting part 30 of this embodiment, the height of the linearity of the bar B is not so important in terms of uniformity of cutting. Therefore, in the cutting device 1 according to the present embodiment, it is possible to perform skin cutting on the bar B with the bend remaining, and the bar B that has been unwound from the coil in the material feeding section 10 can be cut as it is. It can be introduced into the skin cutting section 30 in this state, or in a state in which the bend has been simply corrected in the pre-straightening section 20. As a result, the cutting device 1 can be simplified and the productivity of the bar-shaped product B1 can be improved. Moreover, by performing highly uniform cutting along the circumferential direction of the bar B, the accuracy of the cross-sectional shape of the bar-shaped product B1 can be improved. In particular, in a configuration in which the bar B is shaved simultaneously over its entire circumference, the roundness of the cross-sectional shape can be improved.

In addition, when cutting the skin by rotating the cutting tool around the axis of the bar B, it is necessary to keep the cutting tool in contact with the outer peripheral surface of the bar B under the same conditions while the cutting tool rotates. In addition, it is also important to firmly fix and position the bar B in the direction crossing the axis. Therefore, when using a rotary cutting tool as a cutting tool, the bending of the bar B is corrected to make it suitable for firm fixation, and the fixing tool is bitten into the surface of the bar B. , the bar B is often firmly gripped. At this time, scratches occur on the surface of the bar B due to contact with the fixture. Then, in order to remove the scratches, it becomes necessary to increase the depth of skin cutting with a cutting tool, resulting in a lower material yield. Typically, the depth of the scar formed by contact with such a fixture is on the order of 0.7 mm, making it necessary to perform skin removal to a depth of 0.7 mm or more. On the other hand, when performing skin cutting without rotating the cutting tool 31 as in the skin cutting section 30 in this embodiment, the skin cutting die 32 and the cutting tool 31 surrounding the bar B along the outer periphery It is possible to perform highly uniform skin cutting along the circumferential direction of bar B by positioning bar B according to the shape of No need arises. Therefore, the depth of skin removal can be made shallow. When a milling cutter that simultaneously cuts the entire circumference of the bar B is used as the cutting tool 31, the depth of cutting can typically be suppressed to about 0.2 to 0.3 mm.

In the cutting device 1 according to the present embodiment, the skin cutting section 30 can perform skin cutting on a region having a length along the circumferential direction of the cutting tool 31 at the same time. If there is a stagnation period in which the movement of the bar B along the direction D temporarily stops or slows down, the part of the bar B that is in contact with the cutting tool 31 during that stagnation period will be affected for a long time. It will undergo cutting. As a result, that region receives more superficial tissue removal than other regions in the axial direction, and is cut more deeply. As a result, a groove-like flaw is formed along the circumference of the steel material B at that location. Such scratches are called stop scratches.

As explained above, the carriage type conveying device 140 conventionally used in a general combined machine 100 has a pair of carriages 141a and 141b, and one carriage 141a carries the bar material B up to the downstream end of its movable range. After transporting the bar B, the grip on the bar B is released, and the other carriage 141b grips the bar B at the upstream end of its movable range and starts transporting it. At this time, it takes a predetermined time for one carriage 141a to release its grip on the bar B and for the other carriage 141b to grip the bar B. During this time, the bar B cannot be moved in the moving direction D. When the moving speed of the bar B is recorded over time, as shown in FIG. 4(b), the moving speed drops at time intervals corresponding to the reciprocating motion of the carriages 141a and 141b. Therefore, in the carriage type conveyance device 140, the movement of the bar B cannot be performed continuously at a constant speed without interruption, and the movement of the bar B stops or stagnation occurs where the moving speed of the bar B becomes slow. Periods inevitably occur. In the cutting device 1 according to the present embodiment, if a conveyance device having a stagnation period, such as the carriage type conveyance device 140, is used as the power unit for moving the bar material B in the moving direction D, then the stagnation period At this point, stop scratches are formed on the bar B.

However, in the present embodiment, in the chain conveying device 40 used as a power unit for moving the bar material B in the moving direction D, the roller chains 41, 41 rotate continuously without interruption, thereby moving the bar material B. transport. Therefore, when the moving speed of the bar B is recorded over time, the moving speed of the bar B is approximately constant regardless of time, as shown in FIG. 4(a). Therefore, the bar B can be moved continuously at approximately constant speed without interruption. There is no stagnation period in which the movement of the bar B stops or the moving speed of the bar B slows down. Therefore, no stop scratches are formed on the bar B in the skin cutting portion 30.

The specific configuration of the power section is not limited to the chain conveying device 40 as described above, as long as it can move the bar B continuously in the moving direction D along the axial direction. In the case of a power unit that uses a member that reciprocates and makes translational movements along the moving direction D, such as the carriages 141a and 141b of the carriage-type conveyance device 140, it is possible to perform reciprocating movements such as gripping and releasing the bar B. Due to the operations taking place at both ends of the range, there are likely to be periods of stagnation in the conveyance of the bar B. On the other hand, in the case of a power section that uses an annular member that rotates in a single direction, such as the roller chains 41, 41 of the chain conveying device 40, the continuous rotational movement allows the conveyance of the bar material B. It is difficult for a stagnation period to occur, and it is easy to realize continuous movement of the bar B. As a power unit other than the chain conveying device 40 that can continuously move the bar B, a conveyor device that feeds the bar B while contacting the bar B downward in the direction of gravity can be exemplified. In addition, when the motion of the chain conveying device 40 is analyzed in detail, the motion speed fluctuates periodically in correspondence with the spacing between the blades of the sprockets 42, 42, but there is no fluctuation in the motion speed in such short periods. However, the bar B can be considered to be continuously moving without causing stop scratches in the skin cutting portion 30.

The power unit preferably moves the bar B by coming into surface contact with the bar B, like the chain conveying device 40 described above. In other words, it is preferable that the bar B be moved along the axial direction of the bar B over a predetermined length region longer than the diameter of the bar B while being in contact with the surface of the bar B. . By making surface contact with the bar B, the load applied to the bar B from the components of the power section is dispersed, and the load applied to the bar B is kept small while the load applied per unit area of the outer circumferential surface is kept small. You can move. As a result, it is possible to suppress damage such as scratches from being formed on the surface of the bar B due to contact with the members constituting the power section. If scratches occur due to contact with the members constituting the power section, the smoothness of the surface of the bar B obtained by skinning in the skinning section 30 will be impaired.

In the cutting device 1 according to the present embodiment, a chain conveying device 40 as a power unit is provided downstream of the skinning section 30, and the bar B is passed through the skinning section 30 so as to be pulled from the downstream side. I'm letting you do it. It is also possible to provide a power section upstream of the skinning section 30 and push the bar B through the skinning section 30 so as to push it out from the upstream side. However, since the skin cutting part 30 simultaneously contacts and skins a long area such as the entire circumference along the circumferential direction of the bar B, the bar B is pushed out from the upstream side. If B is introduced, buckling may occur in the bar B at the contact portion between the bar B and the cutting tool 31. The occurrence of such buckling can be prevented by providing a power section downstream of the skinning section 30 and pulling the bar B into the skinning section 30.

Further, in the first embodiment, when a cutter such as a milling cutter is used as the cutting tool 31 of the skin cutting section 30, the conveyance speed by the chain conveyance device 40 is set to 80 to 100 m/min. The surface of the bar B can be cut under favorable conditions if the cutting speed is set as follows. By performing cutting while moving the bar B at high speed, welding of the metal material to the cutting tool 31 can be suppressed, and surface deterioration of the bar B can be suppressed. Moreover, cutting resistance can be reduced. Note that when peeling is performed while rotating the cutting edge of the cutting tool around the axis of the bar, the feeding speed of the bar is typically 10 m/min. The following shall apply.

Furthermore, in the cutting device 1 according to the present embodiment, a cutting section 50 is provided immediately downstream of the chain conveying device 40, and the bar B that has been cut by the skinning section 30 is conveyed by the chain conveying device 40. , the bar-shaped product B1 is cut by the cutting section 50 and processed into the length required for the bar-shaped product B1. The long bar B is not wound up into a coil, transported to another processing device, subjected to other processing as appropriate, and then cut. Therefore, it is possible to eliminate the possibility that scratches will be formed on the surface of the bar B after skinning during processes such as winding it into a coil shape and conveying it in a coil shape. Therefore, it is easy to reflect the surface with few scratches obtained by the skin cutting in the skin cutting section 30 as the quality of the final bar-shaped product B1.

[Cutting method]
Next, a cutting method using the cutting device 1 described above will be briefly explained.

In the cutting method according to this embodiment, the bar B is skinned using the cutting device 1 described above. The bar material B wound into a coil is placed in the material supply section 10, and while the bar material B is moved in the moving direction D by the chain conveyance device 40, processing is performed by each component including the skinning section 30. Apply to bar B in order.

The bar material B fed out from the material supply section 10 is introduced into the skin cutting section 30 with the bend remaining after passing through the preliminary straightening section 20, and is skin shaved. Then, the bar-shaped products B1 are manufactured by cutting by the cutting section 50 and correcting the bending by the polishing correction section 60 and the roll correction section 70, and the bar-shaped products B1 are accumulated in the stacking section 80.

After skin cutting by the skin cutting section 30, the cutting device 1 does not perform any bending operation on the bar B and the bar-shaped product B1. Further, in devices other than the cutting device 1 as well, it is preferable not to bend the bar B and the bar-shaped product B1 after being shaved by the skin cutting section 30.

Further, the cutting device 1 does not have a wire drawing section, and the cutting device 1 does not draw wires to the bar B and the bar-shaped product B1. Furthermore, in devices other than the cutting device 1 as well, it is preferable that wire drawing is not performed on the bar B and the bar-shaped product B1 after skin cutting by the skin cutting section 30. For example, after skin cutting is performed using the cutting device 1, it is better not to perform processing using another device for the purpose of wire drawing, such as the combined machine 100 having the wire drawing section 90 described above. Since the skin cutting part 30 of this cutting device 1 can sufficiently remove impurities and scratches on the surface layer of the bar B, there is no need to perform wire drawing for the purpose of reducing the effects of impurities and scratches, and wire drawing is omitted. This is because it is possible to simplify the entire manufacturing process of the bar-shaped product B1, including processing with the cutting device 1, and to avoid changes in properties such as hardening due to wire drawing.

2. Second Embodiment Next, a cutting device 2 according to a second embodiment of the present invention and a cutting method using the same will be described. Below, the explanation will focus on the differences from the cutting device 1 and the cutting method using the same according to the first embodiment. Components that are common to the cutting device 1 according to the first embodiment are indicated by corresponding symbols in the drawings, and description thereof will be omitted.

FIG. 2 schematically shows a cutting device 2 according to a second embodiment of the present invention. In FIG. 2, the cutting device 2 is shown in two stages, upper and lower, but in the actual cutting device 2, the parts described in the lower row are successively provided downstream of the parts described in the upper row.

The cutting device 1 according to the first embodiment is not provided with a wire drawing section, whereas the cutting device 2 according to the second embodiment has a wire drawing section 90. The cutting device 2 includes, from the upstream side along the moving direction D of the bar material B, a material feeding section 10, a pre-straightening section 20, a skin cutting section 30, a first chain conveying device 40A, a shot blasting section 95, and a wire drawing section. 90, a second chain conveying device 40B, a cutting section 50, a polishing correction section 60, a roll correction section 70, and a material collecting section 80. Furthermore, a spinner straightening section may be provided between the second chain conveying section 40B and the cutting section 50, and an inspection section consisting of an eddy current flaw detection device or the like may be provided between the roll straightening section 70 and the wood collection section 80. Good (both illustrations omitted).

The wire drawing unit 90 is a device that reduces the diameter of the bar B and draws it using a wire drawing die. By drawing wire on the bar B, the density of impurities such as oxides and damage such as scratches on the surface of the bar B is reduced, and the influence of impurities and damage on the manufactured bar product B1 is reduced. be able to. For example, a configuration in which wire drawing is performed at an area reduction rate of 8 to 14% can be exemplified.

The cutting device 2 according to this embodiment includes two chain conveyance devices 40A and 40B, each of which has the same configuration as the chain conveyance device 40 according to the first embodiment. The first chain conveying device 40A provided on the upstream side passes the bar B through the skin cutting section 30, and the second chain conveying device 40B provided on the downstream side passes the bar material B through the wire drawing section 90. This is what allows the bar B to pass through. The two chain conveyance devices 40A and 40B are operated in synchronization and convey the bar B at the same speed.

The cutting device 2 according to this embodiment can be considered as a device in which a cutting device including a skin cutting section 30 and a combined machine are directly connected. The cutting device 2 according to this embodiment has a skin cutting section 30 and a first chain conveying device 40A added upstream of the conventional general combined machine 100 as shown in FIG. 3, and a wire drawing section 90. By replacing the downstream carriage-type transport device 140 with the second chain transport device 40B, it can be easily constructed.

As described in the first embodiment, by drawing the bar B using the wire drawing section 90, the density of impurities such as oxides and damage such as scratches on the surface of the bar B is increased. It is possible to reduce the influence of impurities and damage on the manufactured rod-shaped product B1. Therefore, by using the wire drawing section 90 together with the skin cutting section 30, it is possible to manufacture a bar-shaped product B1 in which impurities and damage in the surface layer are particularly reduced. Although degeneration of bar B is more likely to occur due to wire drawing, if it is not necessary to meet the JIS G 4303 standard, or if you want to prioritize reducing impurities and damage over avoiding degeneration, the second method is used. Like the cutting device 2 according to this embodiment, a wire drawing section 90 may be provided in addition to the skin cutting section 30.

In the cutting device 2 according to the second embodiment, not only the power section for passing the bar B through the skin cutting section 30 but also the power section for passing the bar B through the wire drawing section 90 are used. Chain conveying devices 40A and 40B are used instead of the carriage type conveying device 140 used in the general combined machine 100. Thereby, as in the case of the cutting device 1 according to the first embodiment, it is possible to prevent stop scratches from being formed on the bar B due to conveyance by the power unit. Further, by using chain conveying devices as both of the two power units, it is easier to synchronize with each other and convey the bar B at the same speed than when using different types of conveying devices. Both the skin cutting by the skin cutting section 30 equipped with a cutting tool 31 consisting of a cutter and the wire drawing by the wire drawing section 90 equipped with a wire drawing die are carried out well while moving the bar B at the same high speed. be able to. For example, the conveying speed of the bar B by the two chain conveying devices 40A and 40B is set to 80 to 100 m/min. And it is sufficient.

Note that a cutting device equipped with the skinning section 30 is installed separately from the combined machine 100, and the bar B that has been skinned by the cutting device is moved to the combined machine 100, where it is subjected to wire drawing, etc. by the wire drawing section 90. In this case, the bar B can be subjected to both skin cutting and wire drawing. However, in that case, it is necessary to wind up the bar B, which has been subjected to skin cutting in the cutting device, into a coil shape, for example, and transport it to the combined machine 100. Then, scratches are formed on the surface of the bar material B during the process of winding it into a coil shape and the process of transporting it in a coil shape. On the other hand, as described above, the cutting device 2 according to the second embodiment of the present invention, which corresponds to the configuration in which the skin cutting section 30 and the combined machine 100 are directly connected, is used to provide a method between skin cutting and wire drawing. To avoid the formation of scratches due to winding and transportation by continuously performing skin cutting by a skin cutting section 30 and wire drawing by a wire drawing section 90 without winding it into a coil shape or transporting it. Can be done.

Although the embodiments of the present invention have been described above, the present invention is not particularly limited to these embodiments, and various modifications can be made.

1, 2 Cutting device 10 Material supply section 20 Pre-straightening section 30 Skin cutting section 31 Cutting tool 32 Skin cutting die 40, 40A, 40B Chain conveyance device (power section)
50 Cutting section 60 Polishing straightening section 70 Roll straightening section 80 Wood collecting section 90 Wire drawing section 95 Shot blasting section B Bar material B1 Bar-shaped product D Moving direction

Claims (8)

a skinning section that performs skinning to remove the surface layer of a curved bar made of a metal material using a cutting tool;
a power unit that moves the bar along the axial direction through the skinning section, without applying any bending to the bar that has been skinned by the skinning section; , in a cutting device for producing bar-shaped products,
The bar is wound into a coil and placed in the material supply part in a bent state, and is fed out from the material supply part and introduced into the skin cutting part with the bend remaining,
The skin cutting portion cuts a skin on a region having a length along the circumferential direction of the bar without rotating the cutting tool around the axis of the bar while the bar remains bent. The cutting is performed on the entire area at the same time,
The cutting device, wherein the power section continuously moves the bar along an axial direction. The cutting device according to claim 1, wherein the power unit moves the bar by making surface contact with the bar. The power unit is a chain conveying device that pinches the bar from opposite directions between a pair of roller chains and sends the bar along the axial direction by the movement of the roller chains. The cutting device according to item 2. The cutting device according to any one of claims 1 to 3, wherein the power section is provided downstream of the skin cutting section. The cutting device according to any one of claims 1 to 4, further comprising a correction section for correcting bending of the bar material downstream of the skin cutting section and the power section. The cutting device further includes a pre-straightening section for partially unbending the bar material wound into a coil shape in the material feeding section and introducing the bar material into the skin cutting section;
The cutting device according to claim 5, wherein the degree of reduction in bending by the preliminary straightening section is lower than the degree of reduction in bending by the correction section. The skin cutting section has a cutting tool along the circumferential direction of the bar on the inner peripheral surface of a skin cutting die through which the bar passes,
7. The bar according to claim 1, wherein the bar is positioned by the shape of the skin cutting die and the cutting tool surrounding the bar, and is not fixed more firmly. The cutting device described. The cutting device according to any one of claims 1 to 7 is characterized in that a bar made of a metal material is introduced into the skin cutting section in a bent state to perform skin cutting. Cutting method.

Images