JPH04275811A - Cutting work apparatus - Google Patents

Abstract

PURPOSE:To improve the productity of cutting work and to improve the quality by omitting a worker's data registration on cutting stroke. CONSTITUTION:A saddle 3 capable of freely reciprocating vertically is disposed above a table 1 where a substrate 2 is placed, and a spindle 6 for holding a tool 7 and a detecting element 14 capable of freely advancing and retreating in the moving direction of the saddle 3 are provided on the saddle 3. The reference position of the detecting element 14 to the table 1 is previously stored in a storage portion 22. When the saddle 3 is moved to the substrate 2 side, the board thickness of the substrate 2 is calculated from data on the relative travel obtained when the detecting element 14 is brought into contact with the surface of the substrate 2 to be moved backward relatively to the tool 7 and the reference position of the detecting element 14 previously stored in the storage portion 22, and according to the calculation result, the cutting stroke of the tool 7 is controlled.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cutting device, and more particularly to a cutting device suitable for drilling holes in printed circuit boards and the like.

0002

[Prior Art] Conventionally, when drilling holes in printed circuit boards of different thicknesses, an operator registers data on the axial movement amount of a tool, that is, the cutting stroke, in a control device each time before starting machining. Ta.

[0003] Furthermore, in a printed circuit board drilling machine equipped with an automatic paper feeder that automatically supplies printed circuit boards, the operator
In addition to filing thickness data for various printed circuit boards as cutting stroke data, a series of machining schedules were registered in the control device so that machining could be performed in sequence.

0004

[Problems to be Solved by the Invention] However, in the above-mentioned conventional technology, the operator needs to register cutting stroke data in the control device before starting machining, which results in a time-consuming preparation (setup) before machining. There was a problem that it took too much time.

[0005] Furthermore, if an operator registers incorrect data at the time of data registration, processing defects will occur, causing quality deterioration.

[0006] An object of the present invention is to provide a cutting device that can omit data registration of cutting strokes by an operator and improve the productivity and quality of cutting.

[0007]

[Means for Solving the Problems] In order to achieve the above object, the present invention has a table on which a plate-shaped workpiece is placed and a spindle that holds a tool, which are fixed and movable in the axial direction of the tool. a saddle, a detector provided on the saddle and movable back and forth along the direction of movement of the saddle, a storage means for storing a reference position of the detector with respect to the table, and the saddle moves toward the workpiece. When the detector contacts the surface of the workpiece and retreats relative to the tool, the relative movement amount of the detector and the data of the reference position of the detector stored in the storage means are used to determine the relative movement of the workpiece. The present invention includes a control means for calculating the plate thickness and controlling the cutting stroke of the tool based on the calculation result.

[0008]

[Operation] According to the above configuration, before cutting the workpiece placed on the table, by moving the saddle a predetermined amount toward the workpiece along the axial direction of the tool, only the detector The thickness of the workpiece can be determined by contacting the surface of the workpiece. In other words, when the saddle is moved toward the workpiece by a predetermined amount (within a range where the tip of the tool does not collide with the workpiece) with the detector protruding toward the workpiece beyond the tool,
The tool moves a predetermined amount as the saddle moves, but when the detector comes into contact with the surface of the workpiece, it retreats relative to the tool, causing relative movement between the detector and the tool. . Then, the control means calculates the thickness of the workpiece based on the data on the relative movement amount between the detector and the tool and the data on the reference position of the detector with respect to the table, which is stored in advance in the storage means. . Once the plate thickness has been calculated, the detector is retracted, and the control means controls the cutting stroke of the tool based on the plate thickness calculation result, thereby performing cutting.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings.

FIG. 1 shows the overall configuration of a printed circuit board drilling machine which is one of the cutting apparatuses of the present invention. In the figure, a printed circuit board 1 as a workpiece is placed on a table 1, and a saddle 3 is disposed above the printed circuit board 1. A motor 4 is fixed to the upper part of the saddle 3, and a feed screw 5 is directly connected to the motor 4. The feed screw 5 is screwed into a nut (not shown) provided on the back of the saddle 3, and drives the motor 4 to drive the feed screw 5.
By rotating the saddle 3, the saddle 3 reciprocates in the vertical direction in the figure. Further, the saddle 3 is fixed to a slider (not shown) and is movable together with the slider within a plane parallel to the table 1.

A spindle 6 having a chuck 8 is fixed to the front of the saddle 2, and the chuck 8 holds a tool 7. Although not shown in the figure, a motor is provided inside the spindle 6, and the tool 7 is rotationally driven by this motor. Further, a cylinder 9 is fixed to the front of the saddle 2 with a spindle 6 in between, and a pressure foot 11 is suspended from a rod 10 provided on the cylinder 9. Then, by driving the cylinder 9, the pressure foot 11 is moved in the vertical direction.

A cylinder 12 is fixed to the front of the saddle 3, and a detector 14 and a scale 15 are suspended from a rod 13 provided on the cylinder 12. Then, by driving the cylinder 12, the scale 15 and the detector 14 are moved in the vertical direction. Detector 14 has scale 15
Normally, due to its own weight, the saddle 3 protrudes the most toward the board 2. However, for example, when the saddle 3 moves downward and the detector 14 hits the board 2, the saddle 3 moves further. When moved downward, the detector 14 retreats into the scale 15. This causes a relative movement between the detector 14 and the scale 15, and a linear encoder built into the scale 15 outputs a pulse signal corresponding to the amount of relative movement.

A control device 20 is also connected to the scale 15. Inside the control device 20, a calculation section 21 that controls positioning and substrate detection operations, and a storage section 22 that stores processing programs and data are provided. The storage unit 22 is divided into storage areas 22a to 22g.

The contents of data stored in each storage area 22a to 22g will now be explained using FIGS. 2 and 3. The distance Lo between the tip of the tool 7 and the table 1 at the machine origin is stored in the storage area 22a, and the predetermined movement amount Ld that allows the detector 14 to come into contact with the table 1 is stored in the storage area 22b.
The distance La between the top surface of the substrate 1 and the cutting stroke start point (air cut amount) is in the storage area 22c.
The distance Lz between the table 1 and the cutting feed position is respectively registered in . Further, in the recording area 22e, the relative movement amount Lt of the detector 14 when measuring the upper surface of the table 1 is
The substrate thickness data Tx obtained by measuring the substrate 1 is registered in the storage area 22f, and the cutting stroke amount Ls is registered as a calculation result in the storage area 22g.

Next, the operation of the cutting apparatus of this embodiment will be explained using FIG. 4.

First, when a cutting stroke data setting command is output, the cylinder 12 is driven in step 30, and the scale 15 and detector 14, which had been retracted, are lowered.Furthermore, in step 31, the saddle 3 is moved to the position of the tool 7. It moves in the axial direction by a predetermined movement amount Ld. As a result, the detector 14 comes into contact with the surface of the substrate 2, and after further contact with the substrate 1, the detector 14 retreats toward the scale 15, and the detector 14 comes into contact with the surface of the substrate 2.
4 and the scale 15 is measured. Then, in step 32, the calculation unit 21 in the control device 20 calculates the substrate thickness Tx by Tx=Lb-Lt. The relative movement amount Lt is the value when the upper surface of the table 1 is measured as described above, and is the value when the upper surface of the table 1 is measured.
5 is set in the saddle 3, it is registered in advance as data in the storage area 22e.

Further, in step 33, the calculation section 21
is the cutting stroke amount Ls by Ls=Tx+La-Lz
is calculated and the calculation result is registered in the storage area 22g.

Next, in step 34, the motor 4 is driven to raise the saddle and return it to its original position, and in step 35, the cylinder 12 is driven to move the scale 15 and the detector 1.
Raise 4.

When the plate thickness detection operation as described above is completed, the control device 20 executes a machining program based on the data registered in the storage section 22, and performs cutting of the substrate 1. That is, the tool 7 is moved above the preset cutting start point, and then the tool 7 is moved to the table 1.
After positioning at a position away from the top surface by Tx+La, with the cutting stroke amount Ls registered in the recording section 22,
Repeat the drilling cycle according to the machining program.

As described above, according to this embodiment, the cutting start point and cutting stroke can be automatically set by measuring the substrate thickness, so highly efficient cutting can be performed even for substrates with different thicknesses. It can be performed. Additionally, by registering the substrate thickness range and cutting stroke range in the storage section of the control device, it is possible to compare the registered data with the calculation results, further improving the reliability of the cutting process. be able to.

The cutting apparatus of the present invention is applicable not only to a printed circuit board drilling machine but also to other cutting machines such as a planing machine.

[0022]

[Effects of the Invention] As explained above, according to the present invention,
The thickness of the workpiece can be measured and the optimal cutting stroke amount can be automatically set based on the measurement results, eliminating the need for operators to register cutting strokes before starting machining, improving work efficiency. can.

Furthermore, even when cutting substrates having different thicknesses, the thickness can be accurately detected, thereby eliminating processing defects due to errors in setting the thickness of the substrate.

[Brief explanation of the drawing]

FIG. 1 is an overall configuration diagram of a printed circuit board processing apparatus.

FIG. 2 is an explanatory diagram showing the positions of a tool and a detector when measuring plate thickness.

FIG. 3 is an explanatory diagram showing the position of a tool during cutting.

FIG. 4 is a flowchart illustrating the operation of plate thickness measurement.

[Explanation of symbols]

1 Table 2 Printed circuit board 3 Saddle 4 Motor 6 Spindle 7 Tools 12 Cylinder 14 Detector 15 scale 20 Control device 21 Arithmetic unit 22 Recording part 22a-22g Memory area

Claims (1)

[Claims] Claim 1: A table on which a plate-shaped workpiece is placed; a saddle to which a spindle holding a tool is fixed and movable in the axial direction of the tool; a detector that can move forward and backward; a storage means that stores a reference position of the detector with respect to the table; and a storage means that stores a reference position of the detector with respect to the table; The thickness of the workpiece is calculated from the amount of relative movement caused by moving backward relative to the object and the reference position data of the detector stored in the storage means, and the thickness of the tool is calculated based on the calculation result. A cutting device comprising: a control means for controlling a cutting stroke.