Method for clamping bar material on a circular saw cutting machine

Abstract

To provide a bar clamping method for a circular saw cutting machine that prevents the bar from slipping away and ensures the life of the circular saw when gripping three or more bar materials. [Solution] In the horizontal vice clamping step, while the clamping pressure of the vertical vice 34 on a plurality of reinforcing bars (bars) BL, for example four reinforcing bars, is released in the vertical vice releasing step, the four reinforcing bars BL are clamped horizontally using the horizontal vice 32, and in the bar fixing step, the clamping load on the four reinforcing bars BL by the vertical vice 34 is increased again, and the four reinforcing bars BL are fixed by the clamping pressure of the horizontal vice 32 and the clamping pressure of the vertical vice 34. As a result, the four reinforcing bars BL are not fixed in a state where some of them are loosened upward, and therefore a reduction in the lifespan of the circular saw 20 caused by the circular saw cutting machine 10 cutting the reinforcing bars with improper clamping is suppressed.

Description

[Technical Field]

[0001] The present invention relates to a bar clamping method for clamping a plurality of bars to be cut simultaneously by a circular saw cutting machine. [Background technology]

[0002] When repeatedly and continuously cutting long bars such as rebars, steel bars, and wire rods to a desired length with a circular saw cutting machine, a clamping device is used that has a horizontal vise that holds multiple bars horizontally and a vertical vise that holds multiple bars vertically. For example, a clamping device such as that provided on a cutting machine described in Patent Document 1 is used. This clamping device grips the bars near the point where the circular saw passes, so the bars do not move during cutting, ensuring a stable life for the circular saw. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2011-73122 Summary of the Invention [Problem to be solved by the invention]

[0004] As the diameter of the bar decreases, it is desirable to clamp multiple bars with a clamping device to maximize the efficiency of the circular saw. However, particularly when clamping three or more bars with a clamping device, when clamping pressure is simultaneously applied by the horizontal and vertical vises, portions of the bars may escape upward due to the clamping pressure of the horizontal vise. When clamping pressure is applied from the vertical vise in this state, the bars may be fixed with some of the bars escaped upward, resulting in the bars being clamped with some of the bars escaped upward. If the circular saw cuts with such poor clamping, the bars may move during cutting, shortening the life of the circular saw. This problem is particularly pronounced when the bar is a rebar with circumferential and longitudinal ridges on its outer periphery and a pair of flat surfaces on its outer periphery, as the center height of the bar varies.

[0005] The present invention was made against the background of the above circumstances, and its purpose is to provide a bar clamping method for a circular saw cutting machine that, when gripping three or more bars, prevents the bars from slipping away and extends the life of the circular saw.

[0006] The inventors of the present invention have conducted extensive research in light of the above circumstances, and as a result have discovered that by devising the order of clamping operations by the horizontal and vertical vises, and clamping multiple bars using the vertical vise to align them horizontally, then clamping multiple bars using the horizontal vise with the load on the vertical vise set to zero, and then clamping multiple bars with the load on the vertical vise increased, the multiple bars can be fixed in a horizontally aligned state. The present invention was made based on this finding. [Means for solving the problem]

[0007] That is, the gist of the first invention is that (a) a circular saw blade is rotated and arranged in parallel. 3 or moreA bar clamping method for a circular saw cutting machine, which fixes a plurality of bar materials using a vertical vise and a horizontal vise when cutting the plurality of bar materials simultaneously to a predetermined length by making cuts into the plurality of bar materials, the method comprising: (b) a vertical vise clamping step of clamping the plurality of bar materials vertically using the vertical vise; (c) a vertical vise releasing step of releasing the clamping pressure of the vertical vise in the vertical vise clamping step to allow the plurality of bar materials to move in a horizontal direction; and (d) while the clamping pressure of the vertical vise on the plurality of bar materials is released, While being guided by the vertical vise and aligned horizontally, The plurality of rods Using the horizontal vise (e) a horizontal vise clamping step of clamping the plurality of bar materials in a horizontal direction, and (f) a bar material fixing step of again increasing the clamping load of the vertical vise on the plurality of bar materials and fixing the plurality of bar materials by clamping with the horizontal vise and clamping with the vertical vise. [Effects of the Invention]

[0008] According to the bar clamping method for a circular saw cutter of the first invention, in the horizontal vise clamping step, 3 or more While the clamping pressure of the vertical vise on the multiple bars is released, the multiple bars are clamped using the horizontal vise. While being guided by the vertical vise and aligned horizontally, The bars are clamped horizontally, and in the bar fixing process, the clamping load on the vertical vise is increased again, and the bars are fixed by the clamping pressure of the horizontal vise and the vertical vise. This prevents the bars from being fixed in a state where some of them escape upward, preventing the circular saw from cutting with a poor clamping position, thereby reducing the shortening of the circular saw's lifespan.

[0009] Preferably, the second invention is the first invention, the vertical vise has a fixed jaw that is fixed in position and has a horizontal support surface that supports the plurality of bar materials, and a movable jaw that is movable toward and away from the fixed jaw in a vertical direction, In the vertical vice releasing step, The movable claw of, In the vertical vice clamping process The clamping pressure of the vertical vise on the multiple bars is released by returning the vertical vise slightly upward from the clamping position on the multiple bars. As a result, in the horizontal vise clamping step, the multiple bars are made movable in the horizontal direction, so that the multiple bars are clamped while being guided by the vertical vise and aligned horizontally. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a front view illustrating a circular saw cutting machine according to an embodiment of the present invention; [Figure 2] FIG. 2 is a diagram illustrating a hydraulic control circuit that controls the drive of a clamp device provided in the circular saw cutting machine. [Figure 3] Figures showing examples of bar material cut by a circular saw cutting machine, where (a) shows a deformed reinforcing bar with longitudinally extending ribs and circumferential nodes, and (b) shows a deformed reinforcing bar in which part of the circumferential nodes of the spiral nodes have been removed in a flat surface. [Figure 4] This is a schematic diagram explaining the operation of the clamping device provided in the circular saw cutting machine of Figure 1, and is a diagram explaining the operation of the vertical vise clamping process in which multiple parallel bar materials are clamped vertically using a vertical vise. [Figure 5] This is a schematic diagram explaining the operation of the clamping device provided in the circular saw cutting machine of Figure 1, and is a diagram explaining the operation of the vertical vise release process in which the clamping pressure of the vertical vise in the vertical vise clamping process of Figure 4 is released to allow multiple bar materials to be moved horizontally. [Figure 6] This is a schematic diagram explaining the operation of the clamping device provided in the circular saw cutting machine of Figure 1, and is a diagram explaining the operation of the horizontal vise clamping process in which multiple bar materials are clamped horizontally using a horizontal vise while the clamping pressure of the vertical vise on the multiple bar materials is released. [Figure 7] This is a schematic diagram explaining the operation of the clamping device provided in the circular saw cutting machine of Figure 1, and is a diagram explaining the operation of the bar material fixing process in which the clamping load on multiple bar materials in the vertical vise is increased again and multiple bar materials are fixed by clamping pressure with the horizontal vise and clamping pressure with the vertical vise. [Figure 8] This is a schematic diagram illustrating the conventional operation of a clamping device provided in the circular saw cutting machine of Figure 1, and explains the state in which the operation of clamping multiple parallel bar materials vertically and horizontally using a vertical vise and a horizontal vise is started. [Figure 9]In Figure 8, after the operation of clamping in the vertical and horizontal directions using the vertical vise and horizontal vise has begun, this is a diagram explaining the state in which multiple parallel bars begin to be clamped in the horizontal direction first using the horizontal vise. [Figure 10] FIG. 10 is a diagram illustrating a state in which a plurality of parallel bars are further clamped by a horizontal vise and are clamped vertically by a vertical vise in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0011] An embodiment of the present invention will be described in detail below with reference to the drawings. Note that in the following embodiment, the drawings are appropriately simplified or modified, and the dimensional ratios and shapes of the various parts are not necessarily drawn accurately. [Example]

[0012] 1, a circular saw cutting machine 10 includes a circular saw drive device 14 rotatably mounted on a base 12 about a horizontal first axis C1. The circular saw drive device 14 includes a rotating frame (not shown) rotatably mounted about the first axis C1, an electric motor (not shown) fixed to the rotating frame, a disk-shaped circular saw 20 supported on the rotating frame so as to be rotatable about a second axis C2 parallel to the first axis C1 and driven to rotate by the electric motor, and an electric actuator (not shown) mounted on the base 12 that rotates the rotating frame (not shown) about the first axis C1 and repeatedly moves the circular saw 20 back and forth from a non-cutting position (not shown) to a cutting position shown in FIG.

[0013] The circular saw 20 is covered by an openable cover 24 having a notch 22 for avoiding interference with a reinforcing bar BL, which will be described later.

[0014] A clamping device 30 is provided on the base 12 for clamping and fixing a plurality of (four in this embodiment) bars, such as rebars BL, into which the circular saw 20 of the circular saw driving device 14 will cut. The clamping device 30 includes a horizontal vice 32 for clamping the rebars BL in the vicinity of where the circular saw 20 will cut, from the lateral direction, i.e., horizontally, and a vertical vice 34 for clamping the rebars BL in the vicinity of where the circular saw 20 will cut, from the longitudinal direction, i.e., vertically.

[0015] Behind the circular saw drive unit 14 are provided a roller conveyor (not shown) that supports four reinforcing bars BL so that they can move longitudinally, and a bar feeder (not shown) that is movably installed along the roller conveyor and clamps, for example, the ends of the four reinforcing bars BL opposite the cutting position, and feeds, for example, the four reinforcing bars BL at predetermined lengths from one end onto the flat support surface FS of the work table 34a of the vertical vise 34. For example, four reinforcing bars BL are supplied to the bar feeder from a bar supply device (not shown) in a parallel arrangement.

[0016] The vertical vise 34 is fixed in position and has a horizontal support surface FS that supports multiple reinforcing bars BL, for example four reinforcing bars.The vertical vise 34 has a work table 34a that functions as a vertical fixed claw of the vertical vise 34, a vertical movable claw 34b that is arranged so that it can move towards and away from the work table 34a, and a vertical vise hydraulic cylinder 34c that drives the vertical movable claw 34b towards the work table 34a to clamp the reinforcing bars BL from the vertical direction.

[0017] The horizontal vise 32 has a backing plate 32a fixed to the work table 34a on the side of the circular saw driving device 14, laterally movable claws 32b provided so as to be able to move towards and away from the backing plate 32a, and a horizontal vise hydraulic cylinder 32c that drives the laterally movable claws 32b towards the backing plate 32a to clamp the reinforcing bar BL from the side. A groove 32d is formed in the laterally movable claws 32b to receive the circular saw 20 in order to avoid interference with the circular saw 20 during cutting operation.

[0018] 2 shows a hydraulic control circuit 40 that controls the operation of the horizontal vise 32 and the vertical vise 34 of the clamping device 30, including the horizontal vise hydraulic cylinder 32c and the vertical vise hydraulic cylinder 34c. In FIG. 2, the horizontal vise hydraulic cylinder 32c has a release-side oil chamber CR1 that separates the laterally movable claw 32b from the backing plate 32a and a clamping-side oil chamber CR2 that moves the laterally movable claw 32b toward the backing plate 32a. The three-position switching valve 44 is switched by a command from the electronic control device 80 between a release-side position in which the line oil passage PL, through which hydraulic oil returned to the oil tank 42 is pumped by the hydraulic pump P, is connected to the release-side oil chamber CR1 and the drain oil passage DL is connected to the clamping-side oil chamber CR2, and a fixed position in which the line oil passage PL is connected to the clamping-side oil chamber CR2 and the drain oil passage DL is connected to the release-side oil chamber CR1.

[0019] The vertical vice hydraulic cylinder 34c includes a release-side oil chamber CR3 that moves the vertically movable claw 34b away from the work table 34a, and a clamping-side oil chamber CR4 that moves the vertically movable claw 34b toward the work table 34a. The three-position switching valve 46 is switched by a command from the electronic control device 80 between a release-side position where the line oil passage PL is connected to the release-side oil chamber CR3 and the drain oil passage DL is connected to the clamping-side oil chamber CR4, and a fixed position where the line oil passage PL is connected to the clamping-side oil chamber CR4 and the drain oil passage DL is connected to the release-side oil chamber CR3.

[0020] A pressure reducing valve 48 is provided in the oil passage from the line oil passage PL to the three-position selector valve 46 to limit the pressure supplied to the three-position selector valve 46 in order to prevent the pressure between the three-position selector valve 46 and the clamping-side oil chamber CR4 of the vertical vice hydraulic cylinder 34c from rising above a predetermined value when the three-position selector valve 46 is in the clamping position. Also, a counterbalance valve 50 is provided in parallel with a one-way valve 52 that allows flow from the three-position selector valve 46 to the clamping-side oil chamber CR4 of the vertical vice hydraulic cylinder 34c but prevents flow in the opposite direction from rising above a predetermined value between the three-position selector valve 46 and the clamping-side oil chamber CR4 of the vertical vice hydraulic cylinder 34c when the three-position selector valve 46 is in the neutral position. The counterbalance valve 50 prevents an excessive load from acting on the vertical vise hydraulic cylinder 34c by lifting up a part of the reinforcing bar BL due to a wedge effect during the horizontal vise clamping process described later.

[0021] The reinforcing bars BL have a length of, for example, 5 to 6 m and an average diameter of, for example, 6 mm (D6) to 19 mm (D19). For example, the deformed reinforcing bar in Figure 3(a) has four longitudinal ribs 60 and circumferential nodes 62 formed at regular intervals in the longitudinal direction. The deformed reinforcing bar in Figure 3(b) does not have longitudinal ribs 60, but has spiral nodes 62 formed at regular intervals in the circumferential direction in the longitudinal direction and flat surfaces 64 formed by removing part of the circumferential portion of the nodes 62. The reinforcing bar BL in Figure 1 is assumed to be the one shown in Figure 3(b), and the reinforcing bars BL in Figures 4 to 7 are assumed to be the one shown in Figure 3(a). When attempting to clamp the reinforcing bars BL with the horizontal vise 32 on the support surface FS of the work table 34a, the cross-sectional shapes of the four reinforcing bars BL are irregular, so the heights of the contact points between the reinforcing bars BL from the support surface FS of the work table 34a vary, causing one of the reinforcing bars BL to float upward.If further clamping pressure is applied from the horizontal vise 32, the wedge effect will cause the clamping pressure of the vertical vise 34 to be defeated.

[0022] Returning to Fig. 1, the electronic control device 80 is comprised of a so-called microcomputer, and controls the cutting operation by the circular saw cutting machine 10 and the bar fixing operation by the clamping device 30. The electronic control device 80 functionally includes a vertical vise clamping control unit 82, a vertical vise release control unit 84, a horizontal vise clamping control unit 86, and a bar fixing control unit 88, in relation to the clamping operation of the four reinforcing bars BL by the clamping device 30 prior to cutting the reinforcing bars BL.

[0023] The vertical vise clamping control unit 82 operates the vertical vise hydraulic cylinder 34c of the vertical vise 34 to clamp and tighten the four reinforcing bars BL between the support surface FS of the work table 34a and the vertically movable claws 34b. Figure 4 shows a schematic diagram of such a vertical vise clamping process.

[0024] Next, the vertical vise release control unit 84 moves the vertically movable jaws 34b slightly upward from the state in which the four reinforcing bars BL are clamped between the support surface FS of the work table 34a and the vertically movable jaws 34b by the vertical vise clamping control unit 82, thereby reducing the clamping pressure of the vertical vise 34 to zero and allowing the reinforcing bars BL to move horizontally. Figure 5 schematically shows this vertical vise release process. In this state, a small gap SP is formed between the four reinforcing bars BL and the vertically movable jaws 34b, so that when the horizontal vise clamping control unit 86, which will be described later, clamps the reinforcing bars BL in the horizontal direction, the reinforcing bars BL are guided horizontally by the vertically movable jaws 34b.

[0025] The horizontal vise clamping control unit 86 clamps the four reinforcing bars BL in the horizontal direction using the horizontal vise 32 while the clamping pressure of the vertical vise 34 on the four reinforcing bars BL is released. Figure 6 shows a schematic diagram of such a horizontal vise clamping process.

[0026] The bar fixing control unit 88 again increases the clamping load of the vertical vise 34 on the four reinforcing bars BL that are clamped laterally by the horizontal vise 32, and fixes the four reinforcing bars BL on the support surface FS of the work table 34a by the clamping pressure by the horizontal vise 32 and the clamping pressure by the vertical vise 34. Figure 7 shows a schematic diagram of such a bar fixing process.

[0027] 8 to 10 illustrate a case where four reinforcing bars BL are clamped by the horizontal vise 32 and the vertical vise 34 simultaneously, without performing the vertical vise clamping process and the vertical vise release process. First, in FIG. 8, clamping by the horizontal vise 32 and clamping by the vertical vise 34 are started simultaneously. In FIG. 9, clamping by the horizontal vise 32 is started, and some of the four reinforcing bars BL float upward because the cross-sectional shapes of the four reinforcing bars BL are irregular, resulting in variations in the height of the contact points between the reinforcing bars BL from the support surface FS of the work table 34a. The floating reinforcing bars BL are pushed further upward by the wedge effect, resisting the clamping by the vertical vise 34. As a result, as shown in FIG. 10, the four reinforcing bars BL are fixed in two layers on the support surface FS of the work table 34a.

[0028] As described above, according to the method for clamping reinforcing bars (bars) BL using the circular saw cutting machine 10 of this embodiment, in the horizontal vice clamping step of Fig. 6, the four reinforcing bars BL are clamped horizontally using the horizontal vice 32 while the clamping pressure of the vertical vice 34 on the four reinforcing bars BL is released in the vertical vice releasing step of Fig. 5, and in the bar fixing step of Fig. 7, the clamping load on the four reinforcing bars BL in the vertical vice 34 is increased again, and the four reinforcing bars BL are fixed by the clamping pressure of the horizontal vice 32 and the clamping pressure of the vertical vice 34. As a result, the reinforcing bars BL are not fixed in a state where some of them are loosened upward, and a reduction in the lifespan of the circular saw 20 caused by the circular saw cutting machine 10 cutting the reinforcing bars with improper clamping is suppressed.

[0029] In this embodiment, in the vertical vise releasing step of Fig. 5, the clamping pressure of the vertical vise 34 on the four reinforcing bars BL is released by returning the vertical vise 34 slightly upward from the clamping position on the four reinforcing bars BL. As a result, in the horizontal vise clamping step of Fig. 6, the four reinforcing bars BL are made movable in the horizontal direction, so that the four reinforcing bars BL are clamped while being guided by the vertical vise 34 and aligned horizontally.

[0030] Although one embodiment of the present invention has been described in detail above with reference to the drawings, the present invention is not limited to this embodiment and can be implemented in other modes.

[0031] For example, in the above-described embodiment, the reinforcing bars BL are deformed reinforcing bars as shown in Figures 3(a) and (b), but they may also be bar-shaped steel materials. Even with bar-shaped steel materials, the cross-sectional shapes vary, and similar problems arise.

[0032] In the vertical vise releasing step of the above-described embodiment, the clamping pressure of the vertical vise 34 is set to zero by slightly moving the vertically movable claws 34b upward, allowing the reinforcing bar BL to move horizontally, as shown in Fig. 5. However, as long as the clamping pressure from the vertically movable claws 34b is reduced and the reinforcing bar BL can be moved horizontally, there may be no gap between the vertically movable claws 34b and the reinforcing bar BL.

[0033] Furthermore, in the above-described embodiment, the clamp device 30 was described as clamping four reinforcing bars BL, but it is not necessary to clamp four; the effects of the present invention can be enjoyed as long as there are three or more reinforcing bars.

[0034] The above is merely one embodiment, and although other examples will not be given, the present invention can be implemented in various forms with various modifications and improvements based on the knowledge of those skilled in the art within the scope of the present invention. [Explanation of symbols]

[0035] 10:Circular saw cutting machine 20:Circular saw 32: Horizontal vise 34: Vertical vise 82: Vertical vise clamping pressure control section 84: Vertical vice release control section 86: Horizontal vise clamping pressure control section 88: Bar fixing control unit BL: Reinforced concrete (bar)

Claims

1. A bar clamping method for a circular saw cutting machine, in which a circular saw is rotated while cutting into three or more parallel bar materials, and the bar materials are simultaneously cut to a predetermined length, and the bar materials are fixed using a vertical vise and a horizontal vise, a vertical vise clamping step of clamping the plurality of bar materials in a vertical direction using the vertical vise; a vertical vice releasing step of releasing the clamping pressure of the vertical vice in the vertical vice clamping step to allow the plurality of bar materials to move in a horizontal direction; a horizontal vise clamping step of clamping the plurality of bar materials horizontally using the horizontal vise while the clamping pressure of the vertical vise on the plurality of bar materials is released and the plurality of bar materials are guided by the vertical vise and aligned in the horizontal direction; a bar material fixing step of again increasing the clamping load of the vertical vise on the plurality of bar materials, and fixing the plurality of bar materials by clamping pressure by the horizontal vise and clamping pressure by the vertical vise. A bar clamping method for a circular saw cutting machine.

2. The vertical vise has a fixed claw having a horizontal support surface for supporting the plurality of rods, and a movable claw that can approach and move away from the fixed claw in a vertical direction; In the vertical vise releasing step, the movable claws of the vertical vise are returned slightly upward from the clamping position on the plurality of bar materials in the vertical vise clamping step, thereby releasing the clamping pressure of the vertical vise on the plurality of bar materials.

2. A method for clamping a bar material in a circular saw machine according to claim 1.

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