JP2009291846A - Saw cutter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To inhibit generation of burrs in a saw cutter by means of a holding tool, and to keep a shape of a holding surface of the holding tool to allow repetitive use. <P>SOLUTION: The holding tool is provided in contact with a workpiece on a saw track of a saw in an opposite position of the saw across the material. When the saw proceeds to cut and comes into contact with the holding tool, or immediately before it comes into contact with the holding tool, the holding tool is immediately moved in a direction farther away from the saw. A distance between the saw and the holding tool is recognized by a pressure sensor, a vibration sensor, or a position sensor. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a saw cutting device including a material to be cut that suppresses the generation of burrs when a material to be cut such as steel, resin, or wood is cut with a saw.

  In a saw cutting device that cuts a material to be cut such as a steel material, the material to be cut is held by a clamp or the like, and the material to be cut is cut by advancing the saw or the material to be cut in a direction approaching each other. In the saw cutting device, cutting is performed while pressing the saw against the material to be cut. When the cutting is about to end, the surface of the material to be cut is pushed by the saw blade and plastically deformed and pushed in the direction of the saw cutting or cutting. It may crack before completion and may generate burrs. When burrs are generated in the material to be cut, it is necessary to remove burrs using a deburring device or the like, and there is a problem that labor and cost are increased.

In order to solve this problem, there has been proposed a saw cutting device that prevents the generation of burrs by pressing the material to be cut with a plate or the like in the vicinity of a portion where the material to be cut easily generates burrs. Patent Document 1 discloses a technology for suppressing the generation of burrs by attaching a presser made of a softer material than steel on the side where cutting of steel material is completed, and simultaneously cutting the steel material and the presser when cutting is completed. Has been. By using a soft material for the presser, the burden on the saw blade caused by cutting the presser is reduced.
JP-A-62-44309

  However, with the technique disclosed in Patent Document 1, every time the material to be cut is cut, the pressing tool is intentionally cut or cut, and the shape of the pressing surface is not maintained. Therefore, the presser must be replaced every time the material to be cut is cut.

Therefore, the present invention provides a saw cutting device that does not require replacement of the presser. The saw cutting device of the present invention includes a saw, a presser, and a presser moving means. The presser is disposed on the saw path of the saw. Strictly speaking, they are arranged in a positional relationship in contact with the material to be cut at a position on the saw path opposite to the saw with the material to be cut interposed therebetween. The pressing tool moving means moves the pressing tool in a direction away from the saw when the distance between the saw and the pressing tool is equal to or less than a preset threshold value.
According to the present invention, since the material to be cut is cut in a state where the material to be cut is pressed by the pressing tool, it is possible to prevent burrs from occurring on the material to be cut. Furthermore, the pressing tool is prevented from being cut or cut by a saw, and the shape of the pressing surface is maintained. Therefore, the pressing tool can be used repeatedly.

  According to the present invention, it is not necessary to replace the presser, and it is possible to prevent the occurrence of a situation in which burrs are generated because the presser is not replaced.

The main features of the embodiments described below are listed below.
(Feature 1) The material to be cut is fixed, and the saw moves and cuts.
(Feature 2) After setting the material to be cut, the pressing tool is brought into contact with the material to be cut.
(Characteristic 3) The presser is in contact with the material to be cut in a portion where the saw passes when cutting is completed.
(Feature 4) The presser is the same material as the material to be cut.
(Feature 5) The distance between the saw and the pressing surface of the presser when the cutting is completed is smaller than the cutting width of the saw.
(Characteristic 6) A pressure sensor is attached to the presser, and the presser is moved when a value detected by the sensor becomes a predetermined value or more.

(Example 1)
Embodiment 1 of the present invention will be described below with reference to the drawings.
FIG. 1 shows a saw cutting device 1 according to Embodiment 1 of the present invention. The saw cutting device 1 includes a saw 2,
A saw feed device 6, a presser 3, a presser moving device 4, a material holder 5 to be cut, a control device 7 and the like are included. When the material 11 to be cut is fixed to the material holder 5 to be cut, the presser 3 is installed at a position facing the saw 2 with the material 11 to be cut in between. The material to be cut 11 and the presser 3 are in contact with each other on the saw path 12 that is the cutting path of the saw 2. The saw delivery device 6 advances the saw 2 along the saw path 12 toward the presser 3. A pressure sensor 21 is installed on the pressing surface of the pressing tool 3, and the pressing tool moving device 4 moves away from the saw 2 along the traveling direction of the saw 2 based on the detection result of the pressure sensor 21. The presser 3 is moved.
The control device 7 is connected to the saw feed device 6, the presser moving device 4, and the pressure sensor 21, and controls the saw feed device 6 and the presser moving device 4 based on the input value from the pressure sensor 21. The above operation is realized.

  Next, the operation of the saw cutting device of this embodiment will be described. With the saw 2 in the initial position, the material 11 to be cut, which is a columnar round steel material, is fixed to the material holder 5 to be cut. When cutting a round steel material with a circular saw, as shown in FIG. 2 (a), the pressing surface of the pressing tool 3 is in contact with a cutting completion point 13 where the saw 2 passes through the workpiece 11 when cutting is completed. The position of the presser 3 is adjusted so that is obtained.

  When the cutting operation starts, the saw 2 advances from the initial position toward the material to be cut 11 and cuts while pressing the saw blade against the material to be cut 11. The presser 3 presses the material 11 to be cut from the side facing the moving direction of the saw 2. As shown in FIG. 2, the presser 3 directly presses the cutting completion point 13 where the material 11 to be cut receives pressure from the saw 2 during the cutting operation, so that compared with the case where the peripheral portion of the sawway 12 is pressed. Thus, the generation of burrs can be more reliably suppressed.

As shown in FIG. 2B, the width W ₂ of the presser 3 is preferably narrower than the cutting width W ₁ of the saw 2. Even if slight distortion or bending the cut portion of the cut material 11, if the width W ₂ of the retainer 3 narrower than the cutting width W ₁ of the saw 2, saw take pressure to a cut material 11 by the saw 2 The material to be cut 11 can be reliably pressed on the road 12.

Next, the cutting operation in the present embodiment will be described. When the cutting operation is started after adjusting the position of the presser 3, the control by the presser moving device 4 is executed according to the flowchart shown in FIG. When the cutting operation is started in step S2, as shown in FIG. 3A, the saw 2 moves toward the material to be cut 11, and is pressed against the material to be cut 11 while rotating the blade of the saw. 11 is cut. During execution of the cutting operation, as shown in step S <b> 4, the pressure sensor 21 detects the pressure P received by the pressing surface of the pressing tool 3. As shown in FIG. 3B, when the saw 2 and the pressing tool 3 come into contact with each other, the pressure received by the pressing surface increases. The control device 7, the pressure P _L at the time of contact between the saw 2 and the pressing member 3 is preset as a threshold, at the time when a pressure P ≧ P _L, as shown in FIG. 3 (c), The presser 3 is moved faster than the moving speed of the saw 2 in the same direction as the traveling direction of the saw 2. As a result, the presser 3 is immediately moved away from the saw 2 when it comes into contact with the saw 2.

  In this embodiment, the pressure sensor 21 detects when the distance between the saw 2 and the presser 3 becomes zero, and the presser 3 is removed from the saw 2 when the distance between the saw 2 and the presser 3 becomes zero. Move it away. Since the cutting completion portion of the material to be cut 11 where burrs are likely to be generated is cut while being pressed by the presser 3, the occurrence of burrs on the material to be cut can be suppressed. Moreover, since the presser 3 is immediately moved away from the saw 2 when the saw 2 and the presser 3 come into contact with each other, the cutting of the presser 3 by the saw 2 can be suppressed. The shape of the pressing surface of the pressing tool 3 can be maintained, and the pressing tool 3 can be used repeatedly.

  In the present embodiment, the presser 3 is made of the same material as the material to be cut 11. As a result, even when the saw 2 and the pressing tool 3 are in contact with each other and the pressing tool 3 is slightly cut, cutting powders made of different materials are not mixed with each other, and the cutting powder is collected separately for disposal or recycling. There is no need. When cutting the pressing tool for each cutting operation as in the past, there is a concern that the deterioration of the saw blade will be accelerated, so it has been avoided to use a steel material for the pressing tool. In addition, when the presser is moved away from the saw immediately after the saw and the presser are in contact with each other, there is almost no time for the presser to be cut by the saw, and the saw blade is deteriorated by cutting the presser. This problem hardly occurs.

In the present embodiment, the presser 3 can be moved away from the saw 2 immediately before the completion of cutting. Immediately before the completion of cutting, since the thickness of the material 11 to be cut existing between the presser 3 and the saw 2 is thin, it is slightly deformed to the presser 3 side by the pressure received from the saw 2, and the presser 3 The pressure P detected by the pressure sensor 21 installed on the pressing surface of the pressure increases. That is, as shown in FIG. 5 (a), may be set the pressure P ₁ in which the pressing surface of the pressing member 3 is subjected when the saw 2 has reached a certain point from the pressing surface of the pressing member 3 at a distance L ₁ in advance , when the detected pressure of the pressure sensor 21 becomes P ≧ P _1, the retainer 3 when to move in a direction away and saw 2 can be retracted the retainer 3 immediately before disconnection completion.

Further, when the presser 3 is moved in the same direction as the traveling direction of the saw 2, if the moving speeds of the saw 2 and the presser 3 are the same, the saw 2 and the presser 3 are moved as shown in FIG. Is maintained at the distance L ₁ described above. The distance L ₁ is set smaller than the cutting width W ₁ of the saw 2, preset in the threshold pressure P ₁ which the pressing surface of the pressing member 3 is subjected to when it becomes that distance L _1, the pressure sensor detects the pressure P ≧ by carrying out control of the moving speed of the retainer 3 and the same as the moving speed of the saw 2 when a P _1, cracked be cut material 11, should a burr 14 as shown in FIG. 5 (c) Even if it occurs, since the presser 3 presses the burr 14, the connecting portion between the burr 14 and the material 11 to be cut can be cut by the saw 2 as shown in FIG. It can be cut off from the material 11 to be cut.

  In this embodiment, a vibration sensor or the like can be used instead of the pressure sensor 21. Since the vibration transmitted to the presser 3 changes depending on the distance between the saw 2 and the presser 3, the vibration detection result indicates that when the saw 2 and the presser 3 are in contact with each other or between the saw 2 and the presser 3. It is possible to detect when the distance changes to a preset distance.

(Example 2)
In this embodiment, as shown in FIG. 6, a first position detecting means 22 for detecting the position of the presser 3 and a second position detecting means 23 for detecting the position of the saw 2 are provided. 7 controls the saw feed device 6 and the pressing tool moving device 4 based on the detection results of the first position detecting means 22 and the second position detecting means 23, and moves the pressing tool 3 in a direction away from the saw 2. Let A duplicate description of the parts common to the first embodiment is omitted.

  FIG. 7A shows a state in which the saw 2 is in the initial position, and the second position detecting means 23 sets the distance when the saw 2 is in the initial position to zero. FIG. 7A shows a state in which the pressing tool 3 is slid until the pressing surface of the pressing tool 3 comes into contact with the saw 2 in the initial position. The distance at this position is 0. At the stage of FIG. 7A, the material 11 to be cut is not set.

FIG. 7B shows a state in which the material 11 to be cut is fixed by the material holder 5 to be cut and the presser 3 is slid until the pressing surface of the presser 3 comes into contact with the material 11 to be cut. The first position detection means 22 detects the movement distance Q ₀ of the pressing tool 3 until the state shown in FIGS. 7A to 7B is reached. FIG. 7C shows a state in which the saw 2 is cutting the material 11 to be cut, and the second position detection means 23 is the saw until the state from FIG. 7A to FIG. 7C is reached. 2 is detected. The distance L between the saw 2 and the presser 3 is in a relationship of Q ₀ -S.

The positional relationship shown in FIG. 7A can change depending on the diameter of the saw 2 and a slight deviation of the initial position of the saw 2, and therefore it is preferable to adjust the zero point of the first position detecting means 22 as necessary. . Similarly, since the positional relationship in FIG. 7B can be changed depending on the diameter of the material 11 to be cut, it is preferable to measure the position Q ₀ of the first position detecting means 22 before starting cutting as necessary.

FIG. 8 is a flowchart according to the present embodiment. In the same manner as in the first embodiment, work is started by fixing a material 11 to be cut, which is a columnar round steel material, to the material holder 5 to be cut. 2 is arranged at a position in contact with a point passing through the material 11 to be cut. That is, the positional relationship shown in FIG. In this state, the first position detector 22 detects the distance Q ₀ shown in FIG. 7B and stores it in the control device 7.

When the cutting operation is started in step S14 and the saw 2 starts moving in the direction of the material 11 to be cut, the second position detector 23 detects the distance S shown in FIG. The controller 7, the distance between the detection value Q ₀ and the pressing surface from the detection value S, the saw blade and the pressing tool 3 saw 2 during the cutting operation the second position detecting means 23 of the first position detecting means 22 L = Q ₀ −S is calculated. In the control device 7, a threshold L ₁ regarding the distance is set in advance, and when L ≦ L ₁ , the presser 3 is moved in a direction away from the saw 2.

The lower limit threshold value L _1, in order to avoid cutting the retainer 3 must be 0 or more, the upper limit value, depending on the size and material of the saw 2 and the cut material 11, suppress the occurrence of burrs It is set to an appropriate value to obtain the effect. For example, when the thickness of the saw 2 is 2.5 mm and the cutting width is about 3 mm, the threshold L ₁ is preferably 3 mm or less.

  In this embodiment, since the distance between the saw 2 and the presser 3 can be measured, the presser 3 can be reliably moved at the time when the saw 2 and the presser are in contact or just before contact. Since the pressing surface is hardly cut by the saw, the pressing tool can be used repeatedly without being replaced for each cutting operation.

Further, in this embodiment, a time T ₁ until the distance L becomes L ₁ is obtained based on the moving speed of the saw 2, and the presser 3 is pressed when the time T ₁ has elapsed from the start of the movement of the saw 2. You may perform control to move.

In the present embodiment, using the servo motor or the like to hold-downs moving device 4, as shown in FIG. 9 (a), when the distance between the retainer 3 and the saw 2 is smaller than the threshold value L _1, retainer 3 and the distance of the saw 2 may be switched to the control for moving the retainer 3 such that L _2. As shown in FIG. 9 (b), burrs is set the distance L ₂ to a value smaller than the cutting width W ₁ of the saw, as shown in FIG. 9 (c), such as by one side of the cut material 11 is broken Even when 14 occurs, the presser 3 presses the burr 14, so that the connecting portion between the burr 14 and the material to be cut 11 can be cut by the saw 2 as shown in FIG. 9 (d).

When the purpose is to cut the burr 14 generated when one side of the material 11 to be cut as shown in FIG. 9C is cracked, the first position detection means 22 causes the burr 14 to be cut as shown in FIG. Immediately after detecting the indicated distance Q ₀ and storing the distance Q ₀ in the control device 7, the presser 3 is previously moved away from the saw 2 until the distance between the presser 3 and the material 11 to be cut becomes L _2. It may be moved.

1 is a system configuration diagram of a saw cutting device according to Embodiment 1. FIG. (A) is the figure which looked at the vicinity of the pressing tool of Example 1, and (b) is the figure which planarly viewed the vicinity of the pressing tool of Example 1. FIG. (A) to (c) is a diagram showing the progress of the cutting process by the cutting apparatus of Example 1. FIG. 3 is a flowchart of a cutting operation according to the first embodiment. (A) to (d) is a diagram showing the progress of a cutting process by a cutting device of a modified example. The system block diagram of the saw cutting apparatus of Example 2. FIG. FIGS. 4A to 4C are diagrams illustrating distances measured in the second embodiment. 10 is a flowchart of a cutting operation according to the second embodiment. The figure which shows progress of the cutting process by the cutting device of a modification.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Saw cutting device 2 Saw 3 Presser 4 Presser moving device 5 Cut material holder 6 Saw delivery device 7 Control device 11 Cut material 12 Saw path 13 Cutting completion point 14 Burr 21 Pressure sensor 22 First position detection means 23 Second position detecting means

Claims (3)

With a saw,
A pressing tool disposed in a positional relationship in contact with the material to be cut at a position facing the saw across the material to be cut on the saw path of the saw,
A pressing tool moving means for moving the pressing tool in a direction away from the saw when the distance between the saw and the pressing tool is equal to or less than a preset threshold;
Equipped with a saw cutting device.   The saw cutting device according to claim 1, wherein a width of the presser is narrower than a cutting width of the material to be cut by the saw. Position detecting means for detecting the position of the pressing tool is added,
The pressing tool moving means moves the pressing tool in a direction away from the saw when the saw advances to a position where the distance to the position of the pressing tool detected by the position detecting means is equal to or less than a preset threshold value. The saw cutting device according to claim 1 or 2, wherein

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