JP3902287B2 - Method and apparatus for preventing noise generation in bar cutting machine - Google Patents

Description

[0001]
[Technical field to which the invention belongs]
The present invention relates to a method and apparatus for preventing noise generation in a bar cutting machine. More specifically, when cutting with a fixed side cutting blade that cuts the tip portion of a round bar or the like and a movable side cutting blade that cuts off the tip portion protruding forward from the cutting blade, the rear portion of the bar is The present invention relates to a method and apparatus for preventing noise generation of a bar cutting machine for preventing the generation of impact sound when shaken and violently hits a conveying roller.
[0002]
[Prior art]
Many cylinders are used as material elements in various industrial fields. A metal product (called billet) having such a cylindrical body and high tensile strength is often required to have high dimensional accuracy, and further, since it is a mass-produced product, extreme cost reduction is also required. Such a cylindrical billet is mass-produced in a “dharma drop” type by high-speed cutting of a bar material, for example, a long round bar. A cutting machine known as a mass production machine has a fixed blade having a hole surrounding a cylindrical surface, for example, the entire circumference of a part of the top of a bar, and all or a part of the most advanced portion that protrudes forward from the fixed blade. And a movable blade having a surrounding surface. For mass production of highly accurate cylinders, high accuracy is required for the clearance between the cylindrical inner peripheral surface of the hole and the cylindrical outer peripheral surface of the rod that the fixed blade has, and this accuracy is mathematically high. Has been studied.
[0003]
When a bar is cut at high speed by such a cutting machine, a breaking shock wave is generated and transmitted to a long bar. Moreover, this breaking shock wave propagates to the bar material which bends at the time of cutting. Such bending and shock waves are combined and pass through a pinch roller that strongly holds the bar, and propagates to the bar part behind the pinch roller. The rear part of the bar material subjected to such propagation causes a phenomenon that the rear part swings in a whip-like manner with the pinch roller as a fulcrum, and shock shock occurs, and the conveying roller supporting the bar material is shocked. To hit.
[0004]
Such an impact not only causes damage to the mechanical system including the conveyance roller, but also generates a large impact sound. In factories where such cutting machines are installed, consideration is given to installing the cutting machine in a soundproof room with a soundproof wall to prevent the impact sound from leaking outside the factory. This difficult factory has become a social problem in that it has a negative health and mental impact on the workers in the soundproof room.
[0005]
Various other noise problems that existed in this kind of bar cutting factory have been solved to the extent that they clear the reference value, but the problems based on the cutting principle described above are left unsolved. Conventionally, the conveyance roller has been coated with a nylon layer, the entire conveyance roller is made of nylon, or the conveyance roller is made of resin molds and rubber tires. The nylon coating layer and the conveying roller itself are immediately damaged, resulting in an increase in cost, which is an undesirable measure in this field.
[0006]
[Problems to be solved by the invention]
The present invention has been made based on such a technical background, and achieves the following objects.
[0007]
An object of the present invention is to provide a method and an apparatus for preventing noise generation of a bar cutting machine for preventing the generation of a whip impact sound between a bar and a transport roller group due to the combination of bending and shock waves. .
[0008]
SUMMARY OF THE INVENTION An object of the present invention is to prevent the generation of a whip impact sound between a bar and a transport roller group due to the combination of bending and shock waves without losing the function of a conventional conveying roller height adjusting means. It is an object of the present invention to provide a noise generation prevention method and apparatus for a cutting machine.
[0009]
Still another object of the present invention is to provide a method and apparatus for preventing noise generation of a bar cutting machine and a device for preventing the generation of a whip impact sound between a bar and a conveying roller group due to the combination of bending and shock waves. It is to provide.
[0010]
Still another object of the present invention is to provide a bar cutting machine for preventing the generation of a whiplash impact sound between a bar and a transport roller group due to the combination of bending and shock waves while utilizing the transport function of the transport roller group. It is an object to provide a noise generation prevention method and apparatus therefor.
[0011]
[Means for Solving the Problems]
The present invention relates to a noise preventing means in a mechanical system comprising a cutting machine having a cutting blade that surrounds and is fixed to a peripheral surface of a bar, and a forcible roller that sandwiches and feeds the bar passed through the cutting blade. It is. The bar is in a state of being clamped and fixed by a forcible roller at the time of cutting, and the leading portion of the bar is passed through a fixed blade and does not swing.
[0012]
At the time of cutting, a powerful cutting force acts on the bar material in an instant. At the time of cutting, a crushing shock wave is generated and propagates to the bar, and this wave propagates to the rear part of the forcing roller. A small gap (approximately the gap for sliding expressed by mathematical formulas) theoretically required is provided between the bar and the fixed blade as well as between the bar and the forced roller. For this reason, the portion of the bar material behind the forcing roller has an amplitude that reaches a certain conical surface centered on the axial center line of the rod, and further, the amplitude changes from place to place and vibrates in a wave shape. . Such a vibration phenomenon of the bar is called a so-called whiplash phenomenon.
[0013]
Such a phenomenon does not appear as an impact between the bar and the conveying roller in the present invention. That is, the transport surface formed by the transport roller group is retracted outside the swing region where the bar is shaken and swings, that is, retracts outside the conical surface. This evacuation operation is performed by evacuating the conveyance surface. This evacuation step is taken after the step of pinching the bar by the forced roller. Even in such a state of the evacuation step, the bar can be conveyed by the forcible roller. The deflection of the bar during feeding does not affect the accuracy of the product.
[0014]
The evacuation step is by raising or lowering or tilting or rotating the same group of rollers. The roller group includes a case where the element is a single element. The roller group may be a plurality of groups. When there are a plurality of elements in the roller group, the entire roller group moves up and down or rotates in the same body. In the case of the tilting motion, the rear side of the transport surface may be retracted more significantly than the front side thereof, and the front side of the transport surface may be retracted more significantly than the rear side thereof.
[0015]
As the evacuation means, any of screw type (Japanese Patent Publication No. 61-49046), cylinder type, slope slide type, and other known and commonly used means can be used. When tilting, the roller group is rotatably supported by the retracting means. In addition to the operation based on the present invention, the retracting means also enables the parallel movement of the roller group according to the size of the bar, particularly the diameter of the bar.
[0016]
The retracting means includes a main body that rotatably supports a plurality of rollers forming the roller group and a support means that supports the main body so as to be retractable. The evacuation means may be singular, but a plurality of support means dispersed in the front-rear direction can also be provided. The support means includes a first evacuation means for supporting the front portion of the main body and a second evacuation means for supporting the rear portion of the main body. The second evacuation means has a movable portion and is conveyed by the movement of the movable portion. The surface is saved outside the area. The movable part may be the front part.
[0017]
The first evacuation means and the second evacuation means are the well-known and conventional means other than the cylinder. Both the first and second retracting means are formed from two sliding bodies that support each other by a relative sliding relationship between the inclined surfaces inclined in the advancing direction in which the bar advances on the transport surface. You can also.
[0018]
Each retracting means can be provided with a first movable part and a second movable part. In this case, the first movable part is continuously displaced (moved to an arbitrary continuous position), and the second movable part is selectively retracted to two positions discontinuously. The continuous displacement corresponds to the size of the bar, and the latter retreat corresponds to the retreat movement. The second movable part is preferably supported by the first movable part.
[0019]
【The invention's effect】
In the method and apparatus for preventing noise generation of the bar cutting machine according to the present invention, noise is not generated because the cause itself is removed, and the height adjusting means of the conveying surface can be used as it is as before. Furthermore, it can be provided at low cost without reducing the accuracy of cutting.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
Next, an embodiment of the present invention will be described. 1 to 4 show a modification of the basic embodiment of the method for preventing noise generation of the bar cutting machine of the present invention. FIG. 1 shows the initial or final stage of a method expressed in time series before the start of exercise or after the end of exercise. 2 to 4 show three forms showing an intermediate state of motion after the initial state of FIG.
[0021]
FIG. 1 also shows the cutting method. For cutting the bar W, the fixed blade 1 and the movable blade 2 are used. A stopper 3 is provided in front of the fixed blade 1 and the movable blade 2. The rear surface of the stopper 3 is formed as a vertical surface. The length between this vertical surface and the vertical surface which is the front surface of the fixed blade 1 is adjusted, and the length is the cutting length of the bar. Hereinafter, it is assumed that the bar is a round bar having a circular cross section.
[0022]
The fixed blade 1 has a hole in it. The inner peripheral surface of the hole is a cylindrical surface. The diameter of the cylindrical surface and the diameter of the rod have a mathematically strictly theoretical relationship. The functional relationship uses the physical properties of the steel material, the diameter of the bar, the cutting speed as parameters, and the diameter of the hole is not necessarily larger than the diameter of the bar.
[0023]
As the movable blade 2, there is a movable blade 2 having a cylindrical surface hole that completely surrounds and surrounds the circumferential surface of the bar as in the fixed blade 1. The movable blade 2 shown in the figure has a semi-cylindrical lower end surface. The movable blade 2 is attached to a movable part of a special power press. The press is configured so that the cutting energy can be instantaneously transmitted to the bar.
[0024]
A forced roller group 4 is provided behind the fixed blade 1. The forced roller group 4 is fixed on a table that is firmly fixed to a reference system such as the ground. The forcible roller group 4 is also referred to as a pinch roller, and is a plurality of sets of paired rollers that can form a pair of two bodies and can strongly press the bar material, and has a fixing function and a conveying function.
[0025]
The fixing function is a function that can fix the bar material in a direction perpendicular to both axial centers of both rollers. The forcible roller group 4 is preferably formed from a plurality of pairs of such pinch rollers. That is, it is preferable that the number of sets of the set rollers is 2 or 2 or more. A transport roller group 5 is disposed behind the forcible roller group 4.
[0026]
Although the figure shows one set of the transport roller group 5, a plurality of sets of roller groups can be used. Here, a group means including a plurality of element rollers 7 that can move in the same body, and the number of elements may be single. When one group of element rollers 7 is single, a plurality of partial groups are provided. Accordingly, the transport roller group 5 includes a main body 6. The same body means that the main body 6 and the plurality of element rollers 7 belong relatively integrally to a single motion system.
[0027]
In FIG. 1, the bar W is already forcibly fed by the forcible roller group 4, passes through the forcible roller group 4, the fixed blade 1, and the movable blade 2, and the leading end face comes into contact with the forcible stop surface of the stopper 3 and stops. is doing. During the forced feeding, the conveyance surface defined by the forced roller group 4 and the conveyance surface formed by the conveyance roller group 5 are adjusted to be completely or substantially the same surface. Means for the adjustment will be described later. It is not necessary for these two transport surfaces to coincide completely. That is, it is only necessary to adjust so that the leading end of the bar W fed by the transport roller group 5 is smoothly drawn into the forced roller group 4.
[0028]
2 to 4 show the state shown in FIG. 1, that is, the state after the pinching state by the forced roller group 4 is established, that is, the retracted state. The retracted state shown in FIG. 2 shows a state where arbitrary portions of the main body 6 are lowered equidistantly in parallel with each other. That is, all the roller elements 7 included in the transport roller group 5 are lowered by an equal distance, and the transport surface thereof is translated downward with respect to the transport surface in the state of FIG. Here, the conveyance surface refers to a plane including a common tangent line where the bar 7 contacts the plurality of element rollers 7 of the conveyance roller group 5. In this case, this plane is formed in a horizontal plane.
[0029]
FIG. 3 shows a state in which the main body 6 is tilted with the rear portion of the main body 6 retracted significantly lower than the front portion. In other words, the rear element roller 7 is significantly lowered than the front element roller 7. The plane that is the transfer surface is inclined with respect to the horizontal plane.
[0030]
FIG. 4 shows a state in which the main body 6 is inclined with the front portion of the main body 6 retracted significantly downward from the rear portion. That is, the element roller 7 at the front side is significantly lowered than the element roller 7 at the rear side. Also in this case, the plane which is the transport surface is inclined with respect to the horizontal plane.
[0031]
In the state of FIGS. 2 to 4, the movable blade 2 is suddenly lowered, and the leading end portion of the fixed size of the bar W is cut in a daruma drop type. Unlike so-called dharma dropping, at the time of cutting, the bar with high tensile strength bends like a balance with the point included in the central region of the forced roller group 4 as a fulcrum, and in particular, the rear part of the forced roller group 4 is greatly bent. Receive power.
[0032]
When receiving this bending force, as shown in FIG. 5 (the bending is emphasized), the center axis of the bar W having a high tensile strength is generally centered on the axis before the cutting. Bends and displaces until it matches the conical surface This displacement is a vibrational displacement. In this case, the inside of the conical surface is a deflection region where the bar W swings. The form of the runout region is represented by a function having many parameters such as the length, thickness, and tensile strength of the bar, and is usually formed in a wave shape instead of a conical surface.
[0033]
At the time of cutting, further, a breaking shock wave is generated at the cutting point. Since this wave propagates through the bar W, it is a shock wave that passes through the inside of the forced roller group 4, reaches the rear end face of the bar W, reflects off the rear end face, and travels forward. The impact force of this shock wave is nonlinearly added to the bending force. For this reason, the deflection form of the bar W cannot be represented by a simple form as shown in FIG. In the runout region, bulges of peaks and valleys appear at a plurality of locations, but as a whole, they are formed inside the pseudo-conical surface.
[0034]
The main body 6 of FIG. 3 is shown as the main body 6 of FIG. Although the main body 6 is lowered as a whole, the lower part has a lowering distance than the front part. Although such a form of lowering can be arbitrarily adjusted, at least the transport surface formed by the transport roller group 5 is located outside the deflection region.
[0035]
Since the deflection area changes as the bar becomes shorter, the conveyance surface of the conveyance roller group 5 or the element roller 7 is retracted outside the gathering area including all the deflection areas. Next, a description will be given of a retracting means for moving the main body 6 up and down to retract the transport roller group 5 and its transport surface. FIG. 6 shows Embodiment 1 of the saving means. A V roller is used as the element roller 7.
[0036]
A V-roller is a roller whose cross section is formed in a V shape and whose central region is recessed in a valley shape. When a V-shaped roller is used, the common tangential plane is defined as a plane including a plurality of contact points where the V-shaped cross section and the bar W are in contact with each other. The saving means is composed of a first saving means 11 located at the front and a second saving means 12 located at the rear. The first retracting means 11 includes a first cylinder 13 supported on a foundation and a first support means 14 that is supported by the first cylinder 13 and supports the main body 6. The first support means 14 is a member fixed to the main body 6 side, is rotatably coupled to an upper end portion of a piston rod that is an expansion / contraction member of the first cylinder 13, and is supported to be movable up and down with respect to the first cylinder 13. ing.
[0037]
The rotatable rotational position is fixed. The first cylinder 13 is hydraulically driven, and its operation amount is controlled by a position sensor (not shown) that detects the position of the front fixed point P of the main body 6.
[0038]
The second retracting means 12 includes a second cylinder 15 supported on the foundation and a second support means 16 for supporting the main body 6 by the second cylinder 15. The second support means 16 is a member fixed to the main body 6 side, is rotatably coupled to the upper end portion of the piston rod, which is an expansion / contraction member of the second cylinder 15, and is supported so as to be movable up and down with respect to the second cylinder 15. ing. The rotatable rotational position can be fixed. The second cylinder 15 is hydraulically driven, and its operation amount is controlled by a position sensor (not shown) that detects the position of the rear fixed point Q of the main body 6. The saving means composed of the first saving means 11 and the second saving means 12 can be applied to any lifting method shown in FIGS.
[0039]
FIG. 7 shows a second embodiment of the save means. This retracting means comprises a wedge-shaped first retracting means 17 and a wedge-shaped second retracting means 18. The wedge-shaped first retracting means 17 is composed of a first lower wedge 19 and a first upper wedge 21. The first lower wedge 19 is movably supported on the base surface 24. The movable direction is the front-rear direction.
[0040]
The first upper wedge 21 is fixed to the lower end surface of the main body 6. The upper end surface of the first lower wedge 19 and the lower end surface of the first upper wedge 21 have slopes 22 and 23 that slide with each other. The inclined surfaces 22 and 23 are inclined with respect to a plane including the front-rear direction line and parallel to the base surface 24. The base surface 24 is preferably a horizontal plane.
[0041]
The wedge-shaped second retracting means 18 includes a second lower wedge 25 and a second upper wedge 26. The second lower wedge 25 is movably supported on the base surface 24. The movable direction is the front-rear direction. The second upper wedge 26 is fixed to the lower end surface of the main body 6. The upper end surface of the second lower wedge 25 and the lower end surface of the second upper wedge 26 have slopes 27 and 28 that slide with each other.
[0042]
The inclined surfaces 27 and 28 are inclined with respect to a plane including the front-rear direction line and parallel to the base surface 24. The inclined surface 27 and the inclined surface 28 are inclined in opposite directions with respect to a reference surface, for example, the base surface 24. The first lower wedge 19 and the second lower wedge 25 are guided by the common guide means 29 and move in the front-rear direction. A drive means 31 is interposed between the first lower wedge 19 and the second lower wedge 25.
[0043]
As the driving means 31, a hydraulic cylinder is used as the first embodiment. This hydraulic cylinder has two piston rods 32 and 33 on both sides. The piston rods 32 and 33 move simultaneously in opposite directions and expand and contract by the same length. That is, the first lower wedge 19 and the first lower wedge 25 simultaneously move in the opposite directions by the same distance.
[0044]
This Embodiment 2 implements the method of FIG. That is, the main body 6 moves up and down by parallel movement. By the operation of the driving means 31, the first lower wedge 19 and the second lower wedge 25 are moved in the opposite directions by an equal distance so that the first upper wedge 21 and the second upper wedge 26 are fixed in the front-rear direction. Stay up and down. Due to the wedge effect and the geometric arrangement, the accuracy of both positions of the main body 6, that is, the height position and the front-rear position is high.
[0045]
FIG. 8 shows a second embodiment of the driving means 31. The second embodiment is different from the first embodiment only in the embodiment of the drive unit 31. As the driving means 31, a servo motor is used. This servo motor has screw shafts 34 and 35 that output on both sides.
[0046]
The screw shafts 34 and 35 may be single shafts, but are threaded in opposite directions. Embedded in the first lower wedge 19 and the second lower wedge 25 are female screw bodies (nuts) 36 and 37 in which female screws meshing with the screw shafts 34 and 35 are cut. The female screw bodies 36 and 37 are immovable with respect to the first lower wedge 19 and the second lower wedge 25, respectively.
[0047]
In this embodiment, the servo motor 31 increases the positional accuracy of instantaneous feeding of the first lower wedge 19 and the second lower wedge 25. In this embodiment, the main body 6 can be moved up and down at high speed for each cutting.
[0048]
9 to 13 show a preferred embodiment 4 of the apparatus for carrying out the embodiment of the method of the present invention shown in FIGS. As shown in FIGS. 9 and 10, the main body 6 includes a first elevating support means 41 (including means corresponding to the first retracting means 13 in FIG. 6) and a rear (indicated by an arrow a in FIG. 9) and the rear. The second elevating support means 42 (including means corresponding to the second retracting means 15 in FIG. 6) is supported so as to be raised and lowered.
[0049]
The main body 6 is formed from a single frame 43 that extends long in the front-rear direction. The frame 43 is provided with a bearing group 45 composed of two element bearings 44 facing each other in a direction orthogonal to the longitudinal direction. A set of element bearings 44 supports a rotating shaft element 46 in a rotatable manner. The element roller 7 is fixed to the rotary shaft element 46.
[0050]
Two sprockets 47 are coaxially fixed to the extended end of the rotary shaft element 46. A chain 48 is hung between adjacent pairs of sprockets 47. All the sprockets 47 are rotated synchronously by the plurality of chains 48. A driving motor 51 for driving one sprocket 47 is provided in the driving device casing 49 suspended from the lower end surface of the frame 43.
[0051]
A stock field 52 that prepares and waits for the bar W is provided next to the main body 6. Although the description of the transfer means is omitted, the bars on the stock field 52 are transferred one by one to the roller group 5 including the element rollers 7 by the transfer means. Since the element roller is a V roller, one bar W is positioned and stabilized on the transport roller group.
[0052]
The 1st raising / lowering support means 41 and the 2nd raising / lowering support means 42 are the same except a drive part. A servo motor 53 is provided on the first lifting support means 41. A driving force transmission rod 54 is integrally connected to the output shaft of the servo motor 53. One end of the driving force transmission rod 54 is connected to the second lifting support means 42.
[0053]
FIGS. 11-13 has shown the 1st raising / lowering support means 41 in detail. Lifting means 55 is provided on the base 54. A worm gear 56 (FIG. 12) is fixed to the output shaft of the servo motor 53. A drive gear 57 that meshes with the worm gear 56 and rotates with a rotation axis centered in a direction perpendicular to the axis is rotatably supported as will be described later.
[0054]
The drive gear 57 is supported by appropriate means so as not to move in the vertical direction. As shown in FIG. 13, a power transmission gear 58 is fitted coaxially in the center hole of the drive gear 57. The power transmission gear 58 is integrally and firmly fixed to the drive gear 57 by a key 60 (FIG. 12). The center hole of the power transmission gear 58 is coaxially threaded to form a female thread.
[0055]
A control screw 59 meshes with the power transmission gear 58 and is coaxially engaged. The power transmission gear 58 is supported by the support base 62 via a plurality of support ball bearings 61. The support table 62 is fixed to the base table 54. The control screw 59 can be propelled in the axial direction, that is, the vertical direction, but is prevented from rotating so as not to rotate.
[0056]
As shown in FIG. 13, a control gear 63 is fixed coaxially to the drive gear 57. As shown in FIG. 12, the control gear 63 is engaged with a rotational speed extraction gear 64. A rotating disk 65 is coaxially fixed to the rotational speed extraction gear 64 as a unit. The method of detecting the rotation fraction of the rotating disk 65 by the detecting means 66 is a well-known and commonly used technique such as an electric means or an optical means, and will not be described in detail.
[0057]
A first retracting means (means corresponding to the first retracting means 11 in FIG. 6) 71 is provided on a control screw 59 which is lifted and lowered by a control amount by such a lifting means 55 composed of a servo motor 53, a gear group, a detecting means 66 and the like. Is provided. The first retracting means 71 includes an elevating cylinder 72.
[0058]
A main body cylinder casing 73 of the lifting cylinder 72 is fixed to the upper end of the control screw 59. An operating piston 75 having a large cross-sectional area is fitted in a cylinder chamber 74 formed by the main body cylinder casing 73. The lowest moving position of the operating piston 75 is positioned by the lower inner surface of the cylinder chamber 74, and the highest moving position of the operating piston 75 is positioned by the upper inner surface of the cylinder chamber 74.
[0059]
That is, the elevation width of the operating piston 75 is the distance L between the upper and lower inner surfaces of the cylinder chamber 74. The operation piston 75 is a two-position selection type piston. The operating piston 75 is integrally formed with a lifting body 76. The elevating body 76 is a so-called piston rod. A joint pin support 78 is firmly coupled to the elevating body 76 by a plurality of bolts 77.
[0060]
The joint pin support base 78 has an insertion hole in the lateral direction. A joint pin 79 is inserted into the insertion hole. Both side frames 43 </ b> R and 43 </ b> L are firmly fixed to the joint pin 79 with bolts 81. Both side frames 43R and 43L are the frames 43 shown in FIGS. A plurality of element rollers 7 are rotatably supported on both side frames 43R and 43L.
[0061]
When the bolt 81 is loosened, the inclination angles of the both side frames 43R and 43L can be adjusted. The inclination angle of the frame 43 shown in FIG. 10 is adjusted, and the conveyance surface formed by the conveyance roller group 5 is adjusted horizontally. When such horizontal adjustment is performed artificially, the program origin of the rotation speed coordinate of the control screw 59 is adjusted to zero.
[0062]
The control rotation speed of the control screw 59 by the servo motor 53 is determined according to the diameter of the bar W. The number of rotations is the same between the first lifting support means 41 and the second lifting support means 42. That is, the frame 43 can be translated in the vertical direction while maintaining the level. The position of the main body 6 shown in FIG. 1 and the position of the main body 6 shown in FIG. 2 are obtained by simultaneous operation between the two positions of the lifting cylinder 72 of the first lifting support means 41 and the lifting cylinder 72 of the second lifting support means 42. It is done. This two-position saving operation is instantaneously possible.
[0063]
FIG. 14 shows a block circuit for carrying out the method of the invention and operating the device. The block circuit shown in this figure is for the case where the method shown in FIGS. 1-2 is implemented by using the save means 71 shown in FIGS. Input means 81 is provided on an operation control panel (not shown). The rotation speed N of the servo motor 53 as a driving means and the size D of the bar W are input from the input means 81 to the controller 82.
[0064]
The controller 82 and the servo motor 53 are connected bidirectionally. Communication between the lift signal 83 output from the controller 82 and the actual rotational speed signal 84 of the servo motor 53 is performed. The controller 82 sends an operation signal 85 to the press. The operation of the press and the operation of the movable blade 2 are the same.
[0065]
FIG. 15 shows operation steps of the apparatus system. The start button on the control panel is pressed (step 1), and the power of each device is turned on as an initial condition for the operation of the apparatus system. The parameters are input from the input means 81 to the controller 82 (step 2). The forced roller group 4 is started (step 3), the movable part of the press is raised to the initial position, the movable blade 2 is raised, and the transport roller group 5 is started (step 4).
[0066]
The main body 6 is raised to a fixed position (step 5). The height coordinate from the machine origin which is this fixed position is determined by the rotation speed of the servo motor 53 which is an input parameter. The bar W is advanced by the propulsive force of the transport roller group 5 and the forcible roller group 4, passes through the fixed blade 1 by the feed force of the forcible roller group 4, and is stopped by the stopper 3. This stop is detected by a sensor (not shown).
[0067]
The bar W hits the stopper 3 (step 6), and it is determined whether the piston 75 is in the raised position or the lowered position (step 7). If the piston 75 is not lowered, the elevating cylinder 72 is operated to lower the piston 75 (step 8). The main body 6 is lowered by a certain height width (step 9). The press / movable blade 2 operates to perform cutting (step 10). The bar W is fed by the forced roller group 4 (step 11). Whether the rear end of the bar W has passed a fixed point (not shown) is detected by a fixed point passing sensor (not shown) (step 12).
[0068]
If it has not passed the fixed point, the process returns to step S6. In the case of passing through the fixed point, the end of the program of FIG. 15 is ended, but actually the next bar is introduced into the transport roller group 5 and the above steps are repeated.
[0069]
16 and 17 differ from the above-described operation program shown in FIG. 15 in that the transport roller group 5 moves up and down for each cutting operation. Steps 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, and 12 in FIGS. 16 and 17 are the same as those in FIG. In FIG. 16 and FIG. 17, Step 10A and Step 10B are inserted between Step 10 and Step 11.
[0070]
Steps 10A and 10B are operations in which, after the press operation, the piston 75 rises and the main body 6 rises to a raised position, which is a fixed position. By adding these two steps, the transport roller group 5 moves up and down for each cutting operation.
[0071]
In the description so far, the rear part behind the forcible roller group 4 of the bar is free to swing, but the swing can be restrained. That is, the shake area can be restrained. For example, in response to the lowering of the transport roller group 5, the upper end of the rubber cushion rises to the transport surface of the transport roller group 5 before the lowering.
[0072]
Alternatively, a rubber cushion is immovably disposed between adjacent element rollers 7. A plane including the upper ends of the plurality of rubber cushions arranged in an immovable manner is set at a position lower than the conveyance surface of the conveyance roller group 5 before being lowered.
[0073]
In any case, such a rubber cushion restrains the deflection of the bar and reduces the amplitude of the deflection. Such a rubber cushion does not need to be positioned, and industrial waste can be recycled and used, so that the cost increase for that is insignificant.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing an initial operation position of a first embodiment according to a noise cutting prevention method for a bar cutting machine according to the present invention.
FIG. 2 is a cross-sectional view showing a next operation position of the first embodiment.
FIG. 3 is a cross-sectional view showing a next operation position of the second embodiment.
FIG. 4 is a cross-sectional view showing a next operation position of the third embodiment.
FIG. 5 is a cross-sectional view showing the deflection of the bar according to the third embodiment.
[Fig. 6] Fig. 6 is a front view showing Embodiment 1 by the noise generating prevention apparatus for the bar cutting machine of the present invention.
[Fig. 7] Fig. 7 is a front view showing a second embodiment of the noise generating prevention apparatus for the bar cutting machine of the present invention.
[Fig. 8] Fig. 8 is a front view showing a third embodiment of the apparatus for preventing noise generation of the bar cutting machine of the present invention.
FIG. 9 is a plan view showing a fourth embodiment of the apparatus for preventing noise generation of a bar cutting machine according to the present invention.
FIG. 10 is a front view of FIG. 9;
FIG. 11 is a front view showing an elevating support means and a first retracting means according to a fourth embodiment.
FIG. 12 is a plan view of FIG. 11;
FIG. 13 is a side view of FIG. 11;
FIG. 14 is a block circuit diagram used for a noise generating prevention apparatus for a bar cutting machine according to the present invention.
FIG. 15 is a flowchart showing a mode of operation;
FIG. 16 is a flowchart showing another mode of operation;
FIG. 17 is a flowchart showing a continuation of FIG. 16;
[Explanation of symbols]
1 ... fixed blade
2 ... Movable blade
3 ... Stopper
4 ... Forced roller group
5 ... Conveying roller group
6 ... Body
7 ... Element roller
11, 71... First retreat means
12, 72 ... second evacuation means
13 ... 1st cylinder
14 ... 1st support means
15 ... Second cylinder
16 ... second support means
17 ... Wedge shaped first evacuation means
18 ... wedge-shaped second retreat means
19 ... First lower wedge
21 ... 1st upper wedge
22,23 ... Slope
25 ... second lower wedge
26 ... second upper wedge
31 ... Driving means
32, 33 ... piston rod
34, 35 ... Screw shaft
72. Working cylinder (first retracting means)
75 ... Piston (first escape means)
81 ... Input means
82 ... Controller

Claims (6)

A cutting machine comprising a cutting blade for cutting a bar;
A forcible roller forcibly feeding the bar material passed through the cutting blade;
It is a noise generation prevention method of a bar cutting machine for preventing the generation of noise due to a breaking shock wave when cutting the bar by a bar cutting machine comprising a group of rollers for feeding the bar to the forced roller,
A retracting step for retracting a conveying surface formed by the roller group to the outside of a swing region where a rear portion of the bar is swung from the forced roller by the breaking shock wave ;
The method of preventing noise generation of a bar cutting machine, wherein the step of retracting retracts the roller group as a whole so that the rear side of the conveying surface is retracted more significantly than the front side thereof. A cutting machine comprising a cutting blade for cutting a bar;
A forcible roller forcibly feeding the bar material passed through the cutting blade;
It is a noise generation prevention device of a bar cutting machine for preventing generation of noise due to a breaking shock wave when cutting the bar by a bar cutting machine composed of a group of rollers for feeding the bar to the forced roller,
A retracting means for retracting the conveying surface of the roller group to the outside of a swing area where the free end of the bar swings due to the breaking shock wave ;
The evacuation means is
A main body rotatably supporting a plurality of rollers forming the roller group;
Comprising support means for supporting the main body in a retractable manner,
The support means includes first support means for supporting a front portion of the main body and second support means for supporting a rear portion of the main body,
The apparatus for preventing noise generation of a bar cutting machine, wherein the support means has a movable part, and the conveying surface is retracted to the outside of the region by the movement of the movable part. In claim 2 ,
The apparatus for preventing noise generation of a bar cutting machine, wherein the movable part is a cylinder. In claim 2 ,
Both the first support means and the second support means include the movable part, and both the movable parts are two-position operation cylinders. In claim 2 ,
The apparatus for preventing noise generation of a bar cutting machine, wherein the movable part includes a first movable part and a second movable part, the first movable part continuously moves, and the second movable part discontinuously moves. . In claim 2 ,
Wherein the first support means second support means, both sliding of the two bodies mutually supported by relationships mutually slide relatively with inclined faces which are inclined to the traveling direction of the bar on the conveying surface progresses An apparatus for preventing noise generation of a bar cutting machine, characterized by being formed of a moving body.

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