JPH0631515A - Method and device for detecting performance of core drill for drilling machine - Google Patents

Abstract

PURPOSE:To detect the time when the performance of a core drill is deteriorated due to the loaded chips thereon by providing a control means outputting a core drill performance degraded condition indicating signal when the pressing force of core drill member is larger than the value set preliminarily during drilling operation of a platelike material. CONSTITUTION:A drilling condition detecting device 32 for core drills 52, 56 for a boring machine is provided with distortion gauges 61, 75 and a control part 82. The gauges 61, 75 detect the pressing force of the core drills 52, 56 being under drilling operation for a glass plate 50. The control part 82 compares the pressing force of the core drills 52, 56 detected by the gauges 61, 75 with the preliminarily set value and outputs the core drills, drilling quality deterioration indication signal when the former is larger than the latter. Accurate detection is made in this way so that the drilling quality management is made possible.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for detecting the sharpness of a core drill for a punching machine, which detects whether the core drill has good or bad sharpness when punching a glass plate or the like with a core drill having a grinding surface formed by a grindstone. Regarding the device.

[0002]

2. Description of the Related Art Generally, a core drill of a punching machine for a plate-like material such as a glass plate is formed into a cylindrical shape with a grindstone, and a grinding portion is formed on its outer circumference and inner circumference. The grinding portion is formed by embedding a plurality of diamond abrasive grains in a bond agent, and a glass plate or the like is ground by the diamond abrasive grains protruding from the bond agent. That is, when the core drill is rotated by pressing the end surface of the cylindrical core drill against a plate-like material such as a glass plate, an annular groove hole is formed in the plate-like material at the outer and inner grinding portions of the cylindrical core drill. When the core drill is continuously pressed, the annular groove penetrates the plate-shaped material to punch the plate-shaped material. The holes thus drilled are, for example, regulators of automobiles,
Used when mounting hinges and wipers.

On the other hand, when the core drill is clogged, the sharpness of the core drill is deteriorated and the productivity is lowered. Therefore, it is necessary to manage the core drill so that the sharpness thereof is not deteriorated. Then, the management of the sharpness of the core drill is generally judged to be the dressing time after the number of plate-shaped materials which have been set empirically are drilled.

[0004]

However, this method cannot accurately detect a condition such as clogging of the core drill. Therefore, since the plate-shaped material may be punched in a state where the core drill is clogged, there is a problem that the sharpness of the core drill deteriorates and the quality of the product deteriorates.

The present invention has been made in view of the above circumstances, and is for a perforator capable of controlling the sharpness of the core drill to accurately judge the dressing time of the core drill and keeping the quality of the product constant. An object of the present invention is to provide a method for detecting sharpness of a core drill and a device therefor.

[0006]

In order to achieve the above object, the present invention provides a punching machine for punching a plate-shaped material sandwiched by a pair of clamp members with a core drill member, the drilling machine being provided in the punching machine. A detection means for detecting the pressing force of the core drill member when the plate-shaped material is being drilled by the core drill member,
Control for comparing the pressing force of the core drill member detected by the detecting means with a preset value, and outputting a signal for worsening the sharpness of the core drill when the pressing force of the core drill member is larger than the preset value. Means and are provided.

[0007]

According to the present invention, the detection means and the control means are provided in the punching machine for punching the plate-shaped material sandwiched by the pair of clamp members with the core drill member. The detecting means detects the pressing force of the core drill member against the plate-shaped material when the plate-shaped material is being drilled by the core drill member. The control means compares the pressing force of the core drill member detected by the detecting means with a preset value, and outputs a signal that deteriorates the sharpness of the core drill when the pressing force of the core drill member is larger than the preset value. .

Therefore, it is possible to accurately detect the time when the sharpness of the core drill is deteriorated due to clogging or the like, so that the sharpness of the core drill can be managed.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of a method for detecting the sharpness of a core drill for a punching machine and its apparatus according to the present invention will be described below with reference to the accompanying drawings. FIG. 1 shows a side view of the punching machine 30, and FIG. 2 shows an enlarged view of a main part of the punching machine 30. The punching machine 30 has a lower clamp part 34 and an upper clamp part 36.
8 is rotatably supported by the body of the punching machine 30 via a pin 40. In FIG. 1, a lower clamp 42 is provided at the left end of the lower arm 38, and the lower clamp 42 is provided with a pair of bosses 42A. A hole 42B is formed in the boss 42A (see FIG. 2).

A cylinder (not shown) is provided at the right end of the lower arm 38 in FIG. By the operation of this cylinder, the lower arm 38 rotates about the pin 40, so that the lower clamp 42 moves in the vertical direction. And
The lower clamp 42 moves upward to move the lower clamp 42
The lower clamp 42 is held in that position when the surface of the is horizontal. In this case, the punch 30 is attached to the glass plate 5
When 0 is loaded, the lower clamp 42 contacts the lower surface of the loaded glass plate 50.

The upper arm 44 of the upper clamp portion 36 is rotatably supported by the body of the punching machine 30 via a pin 46. A pair of upper clamps 48 are pivotally supported on the left end of the upper arm 44 in FIG. 1, and a hole 48A is formed in the upper clamp 48. Further, similarly to the lower arm 38, a cylinder (not shown) is provided at the right end of the upper arm 44 in FIG. By the operation of this cylinder, the upper arm 44 rotates around the pin 46, and the upper clamp 48 moves in the vertical direction.

When the upper clamp 48 moves downward and contacts the upper surface of the glass plate 50, the upper clamp 4
8 is held in that position. Therefore, the lower clamp 42
By contacting the glass plate 50 with the pair of upper clamps 48 and the glass plate 50, the glass plate 50 can be clamped, and the hole 42B of the lower clamp 42 and the hole 48A of the upper clamp 48 are arranged on the same axis (FIG. 2).

Below the lower clamp 42, a pair of lower core drills 52 are arranged, and the lower core drills 52 are fixed to a drive shaft 54A of a lower spindle motor 54. Therefore, the lower core drill 52 is rotated by the drive of the lower spindle motor 54. Lower spindle motor 54
Is attached to the left end of the lower lifting body 51, and the lower lifting body 51 is supported by guides 53, 53 so as to be vertically movable. The guides 53, 53 are fixed to the lower frame body 55 at a predetermined interval in an upright state. The lower frame 55 is fixed to the punching machine 30 at a position below the glass plate 50.

An opening 51A is formed between the guides 53, 53 of the lower elevating body 51 in parallel with the guide 53, and a nut member 57 is coaxially fixed in the opening 51A. The nut member 57 has a lower strain gauge 6 which will be described later.
1 is attached and the ball screw 59 is screwed. The upper end of the ball screw 59 is rotatably supported on the upper portion of the lower frame 55, and the lower end of the ball screw 59 is connected to the shaft 63A of the spindle motor 63. Therefore, when the spindle motor 63 is driven, the ball screw 59 rotates, and the lower core drill 52 moves up and down together with the lower lifting body 51.

The lower core drill 52 includes a lower clamp 42.
When the glass plate 50 is sandwiched between the upper clamp 48 and the upper clamp 48, the hole 42B of the lower clamp 42 and the upper clamp 48
Is coaxially arranged in the hole 48A. The outer diameter of the lower core drill 52 is equal to the hole 42B of the lower clamp 42.
And larger than the inner diameter of the hole 48A of the upper clamp 48. Therefore, the lower core drill 52 can be fitted into the hole 42B of the lower clamp 42 and the hole 48A of the upper clamp 48.

An upper core drill 56 is arranged above the upper clamp 48. The upper core drill 56 is similar to the lower core drill 52 in the upper spindle motor 5
8 is fixed to the drive shaft 58A. Therefore, the upper core drill 56 is rotated by the drive of the upper spindle motor 58. Like the lower spindle motor 54, the upper spindle motor 58 is supported so as to be able to move up and down.

That is, the upper spindle motor 58 is attached to the left end portion of the upper lifting body 65, and
5 is supported by guides 67, 67 so as to be able to move up and down. The guides 67, 67 are fixed to the upper frame body 69 at a predetermined interval in an upright state, and the upper frame body 69 is fixed to the punching machine 30 at a position above the glass plate 50. Guide 6
An opening 65A is formed in parallel with the guide 67 in the upper lift 65 between 7 and 67, and a nut member 71 is coaxially fixed in the opening 65A. Nut member 71
An upper strain gauge 75, which will be described later, is attached to and a ball screw 73 is screwed. The lower end of the ball screw 73 is rotatably supported by the lower portion of the upper frame 69, and the upper end of the ball screw 73 is connected to the shaft 77A of the spindle motor 77. Therefore,
When the spindle motor 77 is driven, the ball screw 73 rotates, and the upper core drill 56 moves up and down together with the upper lifting body 65.

The lower clamp 42 and the upper clamp 4
When sandwiching the glass plate 50 between the upper core drill 56 and the lower core drill 52,
42B and the hole 48A of the upper clamp 48 are coaxially arranged. Then, when the upper core drill 56 moves downward, the upper core drill 56 is fitted into the hole 42B of the lower clamp 42 and the hole 48A of the upper clamp 48.

As shown in FIG. 2, the lower core drill 52 and the upper core drill 56 are formed in a cylindrical shape with a grindstone, and the grinding portion 6 is formed on the outer and inner circumferences of the lower and upper core drills 52 and 56.
0 is formed. The grinding part 60 is held by embedding a plurality of diamond abrasive grains in a bond agent. The lower and upper core drills 52 and 56 are attached to the glass plate 50.
When the glass plate 50 is rotated by contacting with, the glass plate 50 is annularly ground by the diamond abrasive grains protruding from the bonding agent. Further, when the core drills 52, 56 penetrate the glass plate 50, the inner side of the glass plate 50, which has been ground into an annular shape, is extracted, and the lower and upper core drills 52, 5 are attached to the glass plate 50.
A hole corresponding to the outer diameter of 6 is opened.

The punching machine 30 is provided with a core drill sharpness detecting device 32. The core drill sharpness detecting device 32 includes the above-described upper strain gauge 75, lower strain gauge 61, strain measuring machine 80, and control. It is composed of a unit 82, a display unit 84, and the like. Upper strain gauge 75
Is fixed to the nut member 71, and the lower strain gauge 61 is fixed to the nut member 57. Therefore, the upper strain gauge 75 is attached to the glass plate 50 by the upper core drill 56.
During drilling, the amount of strain in the feed direction of the upper core drill 56 is detected. In addition, the lower strain gauge 61 is used while the glass plate 50 is being drilled by the lower core drill 52.
Detect the amount of strain in the 2 feed direction.

The strain measuring machine 80 comprises an upper strain gauge 7
5 or the amount of strain detected by the lower strain gauge 61 is determined by the upper core drill 56 or the lower core drill 52.
Convert to pressing force to press 0. The allowable limit value of the pressing force is previously input to the control unit 82, and the control unit 82 compares the value of the pressing force obtained by the strain measuring machine 80 with the preset allowable limit value. Further, when the pressing force obtained by the measuring machine 80 is larger than the preset allowable limit value, the control unit 82 further determines the lower or upper core drill 5
The sharpness deterioration signals of 2, 56 are output to the display unit 84.

The display unit 84 displays that the lower or upper core drills 52 and 56 are in a state of poor sharpness due to clogging or the like when a sharpness deterioration signal is received from the control unit 82. This makes it possible to automatically and accurately determine whether or not dressing is required for the upper and lower core drills 56, 52. The operation of the sharpness detecting device for the core drill for a punching machine configured as described above will be described.

First, the allowable limit value is input to the control unit 82. The allowable limit value is empirically determined from the condition such as clogging that deteriorates the sharpness of the core drill. After the input of the allowable limit value is completed, new upper and lower core drills 56 and 52 are attached to the punching machine 30, and the glass plate 50 shown in FIG. 1 is clamped by the lower clamp 42 and the upper clamp 48. next,
The spindle motor 63 is driven to move the rotating lower core drill 52 up and down toward the glass plate 50. As a result, the lower core drill 52 comes into contact with the lower surface of the glass plate 50 to slightly grind the lower surface of the glass plate 50, and then the rotating upper core drill 56 penetrates the glass plate 50 to form a hole in the glass plate 50. . Hereinafter, the steps described above are sequentially repeated to open desired holes in the glass plate 50.

When the glass plate 50 is punched, the upper strain gauge 75 or the lower strain gauge 61 detects the amount of strain in the feed direction of the upper core drill 56 or the lower core drill 52. The strain amount detected by the upper strain gauge 75 or the lower strain gauge 61 is input to the strain measuring machine 80 and converted into a pressing force for pressing the glass plate 50 by the upper core drill 56 or the lower core drill 52.

The converted pressing force is input to the control unit 82, and the input pressing force is compared with the allowable limit value input in advance in the control unit 82. And as a result of comparison,
When the detected pressing force exceeds the preliminarily input allowable limit value, the control unit 82 causes the lower or upper core drill 5 to move.
The sharpness deterioration signals of 2, 56 are output to the display unit 84. The display unit 84 displays that the lower or upper core drills 52 and 56 have poor sharpness due to clogging or the like when a sharpness deterioration signal is received from the control unit 82. This makes it possible to automatically and accurately determine whether or not dressing is required for the upper and lower core drills 56, 52. The display unit 84 may be a trend graph showing the tendency of the pressing force with respect to the number of holes, together with the allowable pressing force. The display unit 84
In addition to this, a warning part (not shown) such as a buzzer may be provided to notify the deterioration of sharpness by a buzzer sound or the like.

As a result, the upper and lower core drills 5
If the sharpness of the upper and lower core drills 56, 52 deteriorates due to clogging of the 6, 5, 52, the timing can be accurately detected.
The sharpness of 6, 52 can be managed. Here, a specific example of the sharpness detecting device for a core drill for a punching machine according to the present invention will be described with reference to FIG. For example, 20.0 shown in FIG.
Assuming that Kg is an allowable limit value that is input in advance in the control unit 82, the pressing force of the upper and lower core drills 56 and 52 is 20.0.
It becomes Kg at the time of the 30th perforation. In this case, the pressing force of the upper and lower core drills 56 and 52 becomes 9.0 kg in the first drilling, and the pressing force in the fifth to 25th drilling becomes less than 20.0 kg. In this way, since there is a certain relationship between the pressing force of the core drill and the sharpness, it is possible to judge the deterioration of the sharpness of the core drill based on the pressing force of the core drill.

In the above embodiment, the glass plate 5 is used as the material to be processed.
However, the present invention is not limited to this, and can be used for hard and brittle materials such as ceramics and silicon, aluminum plates, metal plates, plastic plates, and the like. In the above embodiment,
Although the pressing force is detected by the upper and lower strain gauges, another method may be used, such as measuring the load current of the feed motors 63 and 77 to convert it into pressing force.

[0028]

As described above, according to the sharpness detecting method of the core drill for a punching machine and the apparatus therefor according to the present invention,
The detection means detects the pressing force of the core drill member when the plate-shaped material is being perforated by the core drill member, and the control means compares the pressing force of the core drill member detected by the detection means with a preset value. Further, the control means outputs a signal of deterioration in sharpness of the core drill when the pressing force of the core drill member is larger than a preset value.

In this way, it is possible to accurately detect the time when the sharpness of the core drill is deteriorated due to clogging or the like.
The sharpness of the core drill can be managed. This makes it possible to accurately determine the dressing time of the core drill and keep the product quality constant.

[Brief description of drawings]

FIG. 1 is a side view of a punching machine provided with a sharpness detecting device for a core drill for a punching machine according to the present invention.

FIG. 2 is an enlarged view of a main part of a punching machine in which a sharpness detecting device for a core drill for a punching machine according to the present invention is used.

FIG. 3 is a graph in which the feed force of the core drill is detected by the sharpness detecting device for the core drill for a punching machine according to the present invention.

[Explanation of symbols]

 30 ... Punching machine 32 ... Core drill sharpness detecting device for punching machine 42, 48 ... Clamp 52, 56 ... Core drill 50 ... Glass plate 61, 75 ... Strain gauge 80 ... Strain measuring machine 82 ... Control unit

Claims (2)

[Claims] 1. A sharpness detecting method of a punching machine for punching a plate-shaped material sandwiched by a pair of clamp members with a core drill member, wherein a plate of the core drill member when the plate-shaped material is punched with the core drill member. The step of detecting the pressing force against the sheet material, the step of comparing the detected pressing force of the core drill member with a preset value, and the result of the comparison, the pressing force of the core drill member is a preset value. A method for detecting the sharpness of a core drill sharpness, which comprises a step of outputting a sharpness deterioration signal of the core drill when the size is larger than the above. 2. A drilling machine for drilling a plate-shaped material sandwiched by a pair of clamp members with a core drill member, wherein the core drill member is provided in the drilling machine and drills the plate-shaped material with the core drill member. Comparing the pressing force of the core drill member detected by the detecting means with a preset value, and when the pressing force of the core drill member is larger than the preset value, A sharpness detection device for a core drill for a drilling machine, comprising: a control unit that outputs a signal that deteriorates the sharpness of the core drill.