JP5963568B2 - Tool for cutting tools - Google Patents

Description

  The present invention relates to a cutting tool for cutting a workpiece by using a rotating cutting tool.

  For example, a cutting tool shown in Patent Document 1 is used for processing to cut off and flatten the upper surface of a workpiece. In this cutting tool, the upper surface side is cut and removed by a desired amount by applying a rotating cutting blade to the upper surface side of the workpiece while feeding the workpiece in the horizontal direction. In such a cutting tool, the work feed pitch, which is a value obtained by dividing the work feed speed by the rotation speed of the cutting blade, is reduced, so that the work can be machined more flatly. Processing quality can be obtained.

  On the other hand, in order to increase the cutting efficiency, it is ideal to increase the amount of removal by one cutting with the cutting blade. However, as the removal amount of the workpiece with the cutting blade increases, the processing load increases. Therefore, there exists a problem that the processing quality of a to-be-cut surface deteriorates. In view of this, the amount of cut removal in one cut is appropriately set according to the material of the workpiece and the required cutting surface roughness. And when the thickness which should be removed of a workpiece is thicker than the amount of cutting removal by one cutting, the workpiece is processed into predetermined thickness by repeating cutting several times.

JP 2009-172723 A

  When cutting a workpiece that requires multiple cuttings using a cutting tool, in order to shorten the processing time, only the final cutting is performed by reducing the feed speed and reducing the feed rate. Time is being reduced, but further reduction in processing time is eagerly desired.

  The present invention has been considered in view of such a problem, and an object of the present invention is to perform machining using a cutting tool more efficiently.

The present invention relates to a cutting tool, a holding table having a holding surface for holding a workpiece, a cutting tool having a cutting blade for cutting a workpiece held by the holding table, and the cutting blade as a holding table. A cutting feed means for moving the holding table and the cutting tool relative to each other in a cutting direction for cutting the workpiece to be held, and a cutting tool for cutting the holding table in the machining feed direction perpendicular to the cutting direction. A cutting feed means for moving relative to the first spindle, a first cutting wheel having a first cutting blade mounted on the first spindle, and a first cutting tool mounted on the first spindle. a second spindle arranged concentrically, a second byte wheel having a second cutting blade is mounted on the second spindle possess, the first The spindle rotates at a lower speed than the first spindle, and the work feed pitch, which is the value obtained by dividing the work feed speed of the workpiece by the number of rotations of each cutting edge, is greater for the second cutting edge than for the first cutting edge. Largely, the processing feed means moves the holding table in the direction in which the portion of the workpiece cut by the second cutting blade is further cut by the first cutting blade, and the same workpiece by one processing feed. On the other hand, rough cutting is performed with the second cutting edge, and finishing with the first cutting edge .

  The cutting feed means has first cutting feed means for moving the first spindle relative to the holding surface in the cutting direction, and second cutting feed means for moving the second spindle relative to the holding surface in the cutting direction. It is desirable.

Since the cutting tool according to the present invention has two spindles arranged concentrically and a cutting wheel mounted on each spindle, machining can be performed simultaneously using the two cutting wheels. Processing time can be shortened. By rotating the two spindles at different rotational speeds, machining with a large machining feed pitch and machining with a small machining feed pitch can be performed at the same time, and the machining time can be shortened as compared with the prior art. The second spindle rotates at a lower speed than the first spindle, and the work feed pitch, which is the value obtained by dividing the work feed speed of the workpiece by the number of rotations of each cutting edge, is greater for the second cutting edge. The processing feed means is larger than the blade and moves the holding table in a direction in which a portion of the workpiece cut by the second cutting blade is further cut by the first cutting blade. By roughing the workpiece with the second cutting edge and finishing with the first cutting edge,
The quality of the cutting surface can be improved and the processing time can be shortened.

  In addition, the cutting feed means has a first cutting feed means for relatively moving the first spindle relative to the holding surface in the cutting direction, and a second spindle relative to the holding surface relative to the cutting surface. By being configured by the second cutting feed means to be moved, each spindle can be cut and fed independently, so that machining variations increase and machining time can be further shortened. For example, it is possible to retract one of the cutting blades upward and perform processing only with the other cutting blade. The size of the bite wheel is made to correspond to the size of the workpiece such as φ6 inch and φ8 inch. Therefore, the processing time can be shortened by selecting a wheel suitable for the workpiece size.

It is sectional drawing which shows an example of a cutting tool. It is a perspective view which shows an example of a process feed means. It is a front view which shows an example of the state which processes a workpiece using a cutting tool.

  A cutting tool 1 shown in FIG. 1 is a device that cuts a workpiece held by a holding table 2 with a cutting tool 3. The upper surface of the holding table 2 is a holding surface 20 that holds a workpiece, and the holding table 2 is driven by the machining feed means 8 shown in FIG. 2 and can move in the machining feed direction (X-axis direction in FIG. 1). It has become.

2 includes a ball screw 80 having an axis in the X-axis direction, a guide rail 81 disposed in parallel to the ball screw 80, a motor 82 connected to one end of the ball screw 80, and a ball screw 80. And a moving base 83 having a lower portion slidably contacting the guide rail 80 and being driven by the motor 82 to rotate the ball screw 80. Are configured to move in the X-axis direction. The holding table 2 is fixed to the moving base 83, and the holding table 2 is also moved in the X-axis direction by the movement of the moving base 83 in the X-axis direction. It can be moved relative to the means 3 so as to be able to approach and separate.
It is the composition to do.

  The cutting tool 3 shown in FIG. 1 includes a first spindle 30 having an axis in a cutting direction (Z-axis direction) that is a direction orthogonal to the X-axis direction, and a first cutting tool mounted on the first spindle 30. A wheel 31, a second spindle 32 disposed concentrically with the first spindle 30, and a second bite wheel 33 attached to the second spindle 32 are provided.

  The first bite wheel 31 is configured by fixing a first cutting blade 311 to the lower surface of the base 310, and the base 310 is attached to the first spindle 30 via the mount 34. The second bite wheel 33 is configured by a second cutting blade 331 being fixed to the lower surface of the base 330, and the base 330 is attached to the second spindle 32 via the mount 35.

  The first spindle 30 is formed in a cylindrical shape, and its outer peripheral portions at both upper and lower ends are rotatably supported by bearings 36. A pulley 37 is attached to an intermediate outer peripheral portion of the first spindle 30, and a driving belt 39 driven by a driving pulley 38 is wound around the pulley 37. The drive pulley 38 is attached to the drive shaft 40, and the drive shaft 40 is connected to the first drive motor 41. When the drive shaft 40 rotates by being driven by the first drive motor 41, the power is transmitted to the first spindle 30 via the drive belt 39, and the first bite wheel 31 rotates.

  The second spindle 32 is rotatably supported by a bearing 42 and is connected to a second drive motor 43. The second spindle 32 rotates by being driven by the second drive motor 43, and a second bite wheel. 33 is also configured to rotate.

  The cutting tool 3 is driven by the cutting feed means 5 to cut the first cutting blade 311 and the second cutting blade 331 with respect to the workpiece held on the holding table 2 (Z-axis direction). The holding table 2 and the cutting tool 3 can be moved relative to each other so as to be close to and away from each other. The cutting feed means 5 includes a first cutting feed means 6 for moving the first spindle 30 relative to the holding surface 20 in the cutting direction, and a second for moving the second spindle 32 relative to the holding surface 20 in the cutting direction. It is comprised from the cutting feed means 7. FIG.

  The first cutting feed means 6 includes a ball screw 60 having an axis in the cutting direction, a guide rail 61 disposed parallel to the ball screw 60, a motor 62 connected to the upper end of the ball screw 60, and a nut (not shown). A first elevating base 63 slidably in contact with the guide rail 61, and the first elevating base 63 is guided by the guide rail 61 as the ball screw 60 is rotated by being driven by the motor 62. It is configured to move in the axial direction.

  The second cutting feed means 7 is disposed on the first lifting base 63 constituting the first cutting feed means 6, and is disposed in parallel with the ball screw 70 having an axis in the cutting direction and the ball screw 70. A guide rail 71, a motor 72 connected to the upper end of the ball screw 70, and a second elevating base 73 having a nut (not shown) whose side portion is in sliding contact with the guide rail 71, are driven by the motor 72, Along with the rotation, the first lifting base 73 is guided by the guide rail 71 and moves in the Z-axis direction.

  Next, a case will be described in which the cutting tool 1 shown in FIG. 1 is used to cut the upper surface W1 side of the workpiece W shown in FIG. The workpiece W is formed such that the bumps 101 protrude from the upper surface side of the substrate 100 and the bumps 101 are covered with the resin 102, and the bumps 101 are buried in the resin 102. The bump 101 is exposed by scraping off the resin 102 using the cutting tool 1.

  First, the holding surface 20 of the holding table 2 holds the lower surface W2 side of the workpiece W. Then, the first spindle 30 and the second spindle 32 are brought close to the workpiece W held on the holding table 2 by driving by the first cutting feed means 6 and the second cutting feed means 7 shown in FIG. Go.

  Next, by rotating the first spindle 30 and the second spindle 32 about the concentric rotation axis O by the first drive motor 41 and the second drive motor 43 shown in FIG. The second bite wheel 33 is rotated in the direction of arrow A. At this time, the first spindle 30 is rotated at a high speed and the second spindle 32 is rotated at a lower speed than the first spindle 32. In this way, the first spindle 30 and the second spindle 32 are rotated, and the holding table 2 is processed and fed in the direction of the arrow X1 in the X-axis direction. Then, first, the second cutting edge 331 of the second bite wheel 33 scrapes the upper ends of the resin 102 and the bump 101. Then, the first cutting blade 311 further cuts the portion cut by the second cutting blade 331.

  Here, the first spindle 30 is rotated at a high speed, the second spindle 32 is rotated at a lower speed than the first spindle 32, and the feed speed of the workpiece W viewed from the first spindle 30 and the second spindle 32 is the same. The machining feed pitch, which is a value obtained by dividing the workpiece feed rate by the rotation speed of the cutting blade, is smaller in the first cutting blade 311 than in the second cutting blade 331. Therefore, the second cutting edge 331 can perform cutting more efficiently than the first cutting edge 311. The first cutting edge 311 is less efficient than the second cutting edge 331, but the cutting quality is the second. It becomes higher than the cutting blade 331. That is, the second cutting edge 331 has a function of rough cutting and the first cutting edge 311 has a function of finish cutting, and the quality of the cutting surface can be improved. And since the cutting with which the function sharing was made in this way can be simultaneously realized by one processing feed, processing time can be shortened.

  Further, the rotation speed of the spindle is a value obtained by dividing the peripheral speed of the cutting blade by the circumference. If a bite wheel suitable for the workpiece of φ8 inch is selected and the size of the workpiece is selected, the machining time can be shortened.

  Furthermore, when a plurality of times of cutting are required due to a large amount of removal, the first cutting blade 311 and the second cutting blade 331 are positioned at different heights so that two cuttings can be fed at once. Therefore, the processing time can be shortened.

  Thus, in the cutting tool 3, the first spindle 30 and the second spindle 32 are arranged concentrically and can be processed simultaneously using two cutting wheels. Therefore, the processing time can be reduced from various viewpoints. It can be shortened. In addition, the number of rotations of each spindle can be set independently, and the heights of the first cutting blade 311 and the first cutting blade 331 can be set independently, which increases processing variations and processing time. Can be further shortened.

1: Tool cutting device 2: Holding table 20: Holding surface 3: Tool cutting means 30: First spindle 31: First tool wheel 310: Base 311: First cutting blade 32: Second spindle 33: Second tool wheel 330: Base 331: Second cutting blades 34, 35: Mount 36: Bearing 37: Pulley 38: Drive pulley 39: Drive belt 40: Drive shaft 41: First drive motor 42: Bearing 43: Second drive motor 5: Cutting feed means 6: First cutting feed means 60: Ball screw 61: Guide rail 62: Motor 63: First lifting base 7: Second cutting feed means 70: Ball screw 71: Guide rail 72: Motor 73: Second lifting base Table 8: Processing feed means 80: Ball screw 81: Guide rail 82: Motor 83: Moving base

Claims (2)

A cutting tool,
A holding table having a holding surface for holding a workpiece;
A cutting tool having a cutting blade for cutting a workpiece held by the holding table;
A cutting feed means for relatively moving the holding table and the cutting tool in a cutting direction in which the cutting blade is cut into the workpiece held on the holding table so as to be able to approach and separate;
A machining feed means for moving the holding table relative to the cutting tool in a machining feed direction orthogonal to the cutting direction so as to be able to approach and separate from the cutting tool;
The cutting tool includes:
A first spindle;
A first bite wheel having a first cutting edge mounted on the first spindle;
A second spindle concentrically disposed within the first spindle;
A second bite wheel having a second cutting edge mounted on the second spindle;
I have a,
The second spindle rotates at a lower speed than the first spindle, and the work feed pitch, which is a value obtained by dividing the work feed speed of the workpiece by the number of rotations of each cutting edge, is greater for the second cutting edge. Larger than the first cutting edge,
The processing feed means moves the holding table in a direction in which a portion of the workpiece cut by the second cutting blade is further cut by the first cutting blade. A cutting tool for roughing a workpiece with the second cutting blade and finishing with the first cutting blade . The infeed means is
First cutting feed means for moving the first spindle relative to the holding surface in the cutting direction;
Second cutting feed means for moving the second spindle relative to the holding surface in the cutting direction;
The cutting tool according to claim 1, comprising:

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