JPH03154710A - Machining abnormality detecting device - Google Patents

Abstract

PURPOSE:To detect many kinds of abnormalities by providing a supervisory timer for supervising the machining time and detecting machining abnormality by operating a rapid traverse cylinder and a lead feed cylinder by a fluid in detecting the machining abnormality of a tap machine. CONSTITUTION:A solenoid valve 49 is operated, and a rapid traverse cylinder 5 is advanced to start machining. When a switch LS2 is turned on, a solenoid valve 55 is operated, and a gear rod 17 is rotated by a lead feed cylinder 7 to perform lead feed. When a switch LS4 is turned on, tap machining is started. Simultaneously, a solenoid valve 55 is turned off, the lead feed cylinder 7 is moved backward to reverse the gear rod 17, and the switch LS4 is turned off to complete machining. When the switch LS3 is turned on and the solenoid valve 49 is turned off, the rapid traverse cylinder 5 is returned to the machining start position. If the switch LS4 is not turned on within a designated time after the solenoid 49 is operated, we consider the occurrence of overload. Thus, many kinds of abnormalities can be detected.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a processing abnormality detection device that detects abnormalities during processing in a tapping machine that performs tapping on a workpiece.

(Prior Art) Conventionally, an axial load sensor, a torque sensor, or the like has been used to detect abnormalities during tapping, such as overload detection, or detection of the absence of a prepared hole or tip in a workpiece.

(Problems to be Solved by the Invention) By the way, the use of such a sensor has the following problems.

■The structure is complicated.

■It is difficult to downsize due to large size.

01 sensors can detect only one abnormality, and various types of sensors are required to detect various types of abnormalities.

■Therefore, higher costs are unavoidable.

etc.

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a machining abnormality detection device that has a simple configuration and can easily detect various types of abnormalities.

[Structure of the Invention] (Means for Solving the Problems) In order to achieve the above object, the present invention provides a first cylinder body provided in the processing machine body of a tap processing machine that performs tapping on a workpiece. A first cylinder rod that moves forward and backward by switching fluid; a tap moving rod that has a tap attached to its tip and is rotatable and can move forward and backward; a rotating rod that transmits rotation to the tap moving port; and the first cylinder. a forward end of the first cylinder rod provided on the rod;
a fast-forwarding cylinder consisting of a first detection member that detects the position of the backward movement end; a second cylinder rod that moves forward and backward by switching fluid within a second cylinder body provided in the processing machine body; and this second cylinder. a transmission member provided on the rod and interlockingly connected to the rotating rod that converts the amount of movement of the second cylinder rod into rotation and applies rotational force to the rotating rod; and a transmission member provided on the second cylinder rod and connected to the rotating rod; a lead feeding cylinder comprising a second detected member for detecting the positions of the forward end and the backward end; and the first member provided within the processing machine main body. The first one operated by the second detected member. A machining abnormality detection device comprising: a second detection member; and a monitoring timer that operates the rapid feed cylinder and the lead feed cylinder with the fluid to monitor the machining time of the tap processing machine and detect machining abnormalities of the tap. was configured.

(Function) By employing the machining abnormality detection device of the present invention, compared to normal machining, for example, if the second detection member at the forward end of lead feed is not turned on within a predetermined time, it is determined that an overload condition is present. However, if the second detection member at the lead feed forward end turns on earlier than the predetermined time, it is determined that there is no tap and the second detection member at the rapid feed forward end turns on earlier than the predetermined time. When turning off, the tap is rotated by the lead feed cylinder and moves forward to feed the lead, but since it hits the work and the rapid feed cylinder is pushed back, it can be determined that the pilot hole has not been drilled in the work. The configuration is simplified and it is easy to detect various types of processing abnormalities.

(Example) Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

FIG. 1 shows a schematic configuration diagram of a machining abnormality detection device which is an embodiment of the present invention. The processing abnormality detection device 1 mainly includes a processing machine main body 3, a rapid feed cylinder 5, a lead feed cylinder 7, and a compressed air control device 9.

Inside the processing machine main body 3, a set of fast forwarding backward end and forward end limit switches LSI, L as a first detection member are installed.
S2, and a set of lead feed backward end and forward end limit switches LS3.S2 as a second detection member. LS4 is accommodated.

The rapid feed cylinder 5 mainly consists of a first cylinder body 11
, the first cylinder rod 13 , and the tap moving rod 15
, a gear rod 17 as a rotating rod, and a cam rod 19.

The first cylinder body 11 is installed in the processing machine body 3, and the first cylinder body 11 is
The cylinder rod 13 moves forward and backward inside the first cylinder body 11 by switching the fluid, for example, compressed air.

Further, a tap 21 is provided at the tip of the tap moving rod 15, and a master screw 21 is provided at the tip of the first cylinder rod 13.
It screws together and moves forward and backward while rotating.

Note that the gear rod 17 has a gear 25 at one end, and an engagement portion, in this embodiment, a spline connection, which transmits rotation to the other end of the tap moving rod 15 and allows the tap moving rod 15 to move forward and backward. Part 27.

Further, the cam rod 19 is provided at the rear end of the first cylinder rod 13, and serves as a first detected member of a fast forward backward end and forward end limit switch LSI.

Two cams 29A and 29B are provided as second detected members that actuate LS2.

The lead feeding cylinder 7 mainly includes a second cylinder body 31, a second cylinder rod 33, a ball screw 35 and a cam rod 37 as transmission members.

The second cylinder main body 31 is installed in the processing machine main body 3, and the second cylinder main body 31 is
The cylinder rod 33 moves forward and backward inside the second cylinder body 31 by switching the compressed air.

Further, the ball screw 35 has one end connected to the second cylinder rod 3.
A gear 41 is screwed into a nut member 39 fixed inside the gear rod 3, and the other end meshes with the gear 25 of the gear rod 17.
The gear 25 is rotated in forward and reverse directions by driving the nut member 39 as the cylinder rod 33 moves forward and backward.

The cam rod 37 is provided at the front end of the second cylinder rod 33, and serves as a second detection member for the lead feed backward end and forward end limit switch LS3. Two cams 43A and 43B as second detected members that actuate LS4
is provided.

The compressed air control device 9 supplies compressed air from an air source 45 to the fast-forwarding cylinder 5 side through a so-called three-piece air set 47 consisting of a drain bot, a pressure control valve, and a filter.
A solenoid valve 49 and an air control valve 51A for controlling forward and backward speeds.

51B and check valves 53A and 53B are provided.

In addition, the air piping that supplies air to the lead feed cylinder 7 side is provided with a solenoid valve 55 equipped with 5QL2, air control valves 57A and 57B for forward and backward speed control, and check valves 59A and 59B. Pressure reducing valve 6 on the reverse speed side
1 is provided to appropriately reduce the lead speed when retracting.

(Table 1) Table 1 shows the operation of the rapid-feeding cylinder 5 that rapidly returns from the machining position to the machining position after rapid-feeding from the original position to the machining position in order to perform tapping on a workpiece, and the operation of the rapid-feed cylinder 5 that quickly returns from the machining position to the original position, and Then, the operation of the lead feed cylinder 7 which rotates forward to perform tapping, and at the same time as the completion of machining, reverses and returns to the machining position is displayed.

Next, FIG. 2 shows a time chart during normal machining according to FIG. 1. 5QL1 of the fast-forward solenoid valve 49 is turned on to start machining. At this time, the fast-feed backward limit switch LSI is switched from on to off, the fast-feed cylinder 5 moves forward, and after a predetermined period of time, the fast-feed forward end switch LS2 is turned on and the lead feed solenoid valve 55 QL2 is turned on.
is also turned on, and as the rapid feed cylinder 5 moves forward, the lead feed cylinder 7 moves forward (and the lead feed backward end LS3 is turned off), and the gear rod 17 is rotated forward to perform lead feed. The lead feed forward end switch LS4 is turned on and tapping starts. At the same time, 5QL2 of the lead feed solenoid valve 55 is turned off, the lead feed cylinder 7 starts to move backward, the gear rod 17 is rotated in the reverse direction, and the lead feed forward end switch LS is turned off.
4 is turned off, the tapping process is completed. Further, when the lead feed cylinder 7 retreats and the lead feed backward end switch LS3 is turned on again, 5OL of the fast feed solenoid valve 49
When I is switched from on to off and the rapid traverse cylinder 5 returns to the machining start position, the rapid traverse forward end switch LS2 is turned from on to off, and the rapid traverse backward end switch LSI is switched from on to off.
is switched from off to on.

Next, FIG. 3 shows a time chart when a torque exceeding a predetermined torque is generated in the tapping operation in FIG. 1.

An overload monitoring timer 63 is provided in the machining abnormality detection device 1, and if the lead feed forward end switch LS4 is not turned on at a predetermined time from the start of tapping when 5OLI of the fast-forward solenoid valve 49 is turned on, an overload is detected. It can be considered that the rotation of the gear rod 17 is stopped and the forward movement of the lead feeding cylinder 7 is blocked.

Next, FIG. 4 similarly shows a time chart when the workpiece to be tapped does not have a pilot hole. The lead feed cylinder 7 rotates the tap 21 via the gear rod 17, and the master screw 23 moves forward to perform lead feed, but the tap 23 hits the work surface and stops, and the cylinder rod 13 of the rapid feed cylinder 5 is rotated. is pushed back, and the fast forward forward end switch LS2 is switched from on to off. This switching time can be detected by detecting an alarm.

Next, FIG. 5 similarly shows a time chart when detecting tap breakage, etc. in tapping processing.

The machining abnormality detection device 1 is provided with a no-tap monitoring timer 65 to monitor the time from the machining start time, and the lead feed forward end switch LS4 is turned on earlier than the predetermined time and the lead feed solenoid valve 5QL2 is turned off. It can be detected by detecting the time.

Note that this invention is not limited to the embodiments described above, and can be implemented in other forms by making appropriate changes. In this embodiment, compressed air is used as the fluid, but pressure oil may also be used.

[Effects of the Invention] As is already clear from the above description, the machining abnormality detection device of the present invention is capable of detecting errors when the second detection member at the forward end of the lead feed is not turned on within a predetermined time, for example, compared to normal machining. If the second detection member at the lead feed forward end is turned on earlier than the predetermined time, it is determined that there is no tap and the second detection member at the rapid forward end 1. If the detection member turns off earlier than the predetermined time, the tap is rotated by the lead feed cylinder and moves forward to feed the lead, but since it hits the work and the rapid feed cylinder is pushed back, it is difficult to detect if the pilot hole has not been drilled in the work. By making this determination, the problems of the prior art are effectively solved, the configuration thereof is simplified, and various processing abnormalities can be easily detected.

[Brief explanation of the drawing]

Fig. 1 is a schematic configuration diagram of a machining abnormality detection device which is an embodiment of the present invention, Fig. 2 is a time chart during normal machining according to Fig. 1, and Fig. 3 is a predetermined torque for tapping in Fig. 1. Figure 4 is a time chart when the above torque is generated, Figure 4 is a time chart when the work to be tapped does not have a pilot hole, and Figure 5 is a time chart when detecting tap breakage etc. during tapping. . 1... Processing abnormality detection device 3... Processing machine body 5... Rapid feed cylinder 7... Lead feed cylinder 13.33... Cylinder rod 15... Tap moving rod 17... Gear Rod 19.37...Cam rod 21...Tap 23...Master screw 36...Ball screw 39...Nut member LSL, LS2...Rapid forward backward end, forward end limit switch LS3. LS4... Lead feed backward end, forward end limit switch SQL 1... Rapid feed solenoid valve 5QL2... Lead feed solenoid valve Agent Patent attorney Hidekazu Miyoshi Figure 2 Figure 3 Figure 4 Figure 5

Claims (1)

[Claims] A tap processing machine that performs tapping on a workpiece has a first cylinder rod provided in the processing machine main body that moves forward and backward by switching fluid, and a first cylinder rod that rotates with a tap attached to its tip. A tap moving rod that can freely move forward and backward, a rotating rod that transmits rotation to the tap moving rod, and a first cover that is provided on the first cylinder rod and that detects the positions of the forward end and backward end of the first cylinder rod. a fast-forwarding cylinder consisting of a detection member; a second cylinder rod that moves forward and backward by switching fluid within a second cylinder body provided on the processing machine body; and a second cylinder rod that is provided on the second cylinder rod and moves the second cylinder rod. a transmission member interlockingly connected to the rotating rod that converts the amount into rotation and applies rotational force to the rotating rod; and a forward end of the second cylinder rod provided on the second cylinder rod;
a lead feeding cylinder comprising a second detected member for detecting the position of the retreating end; first and second detection members provided in the processing machine main body and actuated by the first and second detected members; A machining abnormality detection device comprising: a monitoring timer that operates the rapid feed cylinder and the lead feed cylinder with fluid to monitor the machining time of the tap processing machine and detect machining abnormalities of the tap.