JPH0556348U - Cutting depth control device - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a control device capable of accurately detecting a cutting start point of a cutting device and accurately controlling a cutting depth. A spindle head, a spindle rotatably mounted on the spindle head and slidably supported in the axial direction, a collar mounted on the spindle rotatably and slidably in the axial direction, and a spindle head mounted on the spindle head. The attached detection box, which is swingably supported in the detection box, and one end of which is inserted into the spindle head, is engaged with the collar, and is slidable in the detection box in the axial direction. A detection rod that is attached to the other end of the lever, faces the rear end of the detection rod and is attached to the detection box, detects the detection rod, and faces the front end of the detection rod. Then, the recovery cylinder is attached to the detection box and pushes back the detection rod.

Description

[Detailed description of the device]

[0001]

[Industrial application]

 The present invention relates to a cutting depth control device capable of accurately controlling the cutting depth in a cutting device.

[0002]

[Prior Art]

 For example, as shown in FIG. 3 and FIG. 4, a cutting device for making a hole positions a work (3) at a predetermined position in front of a drill unit (2) equipped with a drill (1), and then a drill unit (2). ) Is fed from the origin position to the work (3) for a predetermined distance, and after the tip of the drill (1) hits the work (3), feed the set dimension and drill with the drill (1). Is going.

In the above-described drilling process, the feed amount of the drill (1) until the tip of the drill hits the work (3) and the cut amount corresponding to the depth of the hole are given to the feed mechanism of the drill unit (2) to perform the drilling process. At the same time, the drill unit (2) is fed by the specified size and automatically processed.

As described above, in the above cutting apparatus, since the machining is performed only by controlling the feed amount of the drill unit (2), it is sufficient that the machined surface of the work (3) is machined with high accuracy. If the processed surface had irregularities, an error occurred in the depth of cut. That is, as shown in FIG. 5, during machining, the drill unit (2) is fed by a predetermined size (a) until it reaches the work (3), and then by the cut amount (b). .. In this case, if the surface of the work (3) is swollen, the work is actually performed from the front side, and the work is performed by the dimension (c), and the depth of cut increases. On the contrary, if the surface is concave, the depth of cut is reduced.

Therefore, in general drilling that does not require precision with respect to depth, there is no problem even if the above-mentioned machining is performed, but if high-precision machining is required, the above-mentioned machining causes a problem. Was there. For example, when correcting an imbalance of an engine crankshaft, a cutting device is provided with a cutting amount corresponding to the unbalance amount measured by a balance measuring machine. In this case, the amount deleted by processing becomes a problem. That is, since the depth of cut for the work (crankshaft) (3) is the correction amount as it is, it is necessary to cut accurately.

Therefore, in order to detect the contact of the drill (1) of the drill unit (2) with the work (3) and accurately set the start time of cutting, for example, as shown in FIG. A pulse encoder (4) is attached to the unit (2), and a detection rod (5) protruding from the pulse encoder (4) is constantly protruded by a spring (6), and its tip end is beyond the tip of the drill (1). There is a method of using a cutting device that is slightly projected.

In the above cutting device, the pulse encoder (4) is advanced together with the drill unit (2), and the detection rod (5) of the pulse encoder (4) is moved immediately before the drill (1) contacts the work (3). ) Contacts the work (3) and retracts, and this is detected by the pulse encoder (4) to detect that the drill (1) has contacted the work (3). After that, the drill unit (2) is advanced by a predetermined cutting amount for processing.

Further, as shown in FIGS. 7 and 8, the spindle (7) for mounting the drill (1) is floatingly supported on the spindle head (8) of the drill unit (2), and the spindle (7) is attached to the spindle (7). The detection rod (11) is attached to the mounted collar (10), the detection rod (11) is projected from the spindle head (8), and is detected by the proximity switch (12) attached to the spindle head (8). There is also a method of using the cutting device. The collar (10) is always pushed forward by the built-in spring (13), and pushes the spindle (7) forward. The detection rod (11) is set so as to come closest to the proximity switch (12) when the spindle (7) is projected forward.

In the above cutting device, when the spindle head (8) moves forward, the drill (1) contacts the work (3) and the spindle (7) retracts, the spindle (7) moves together with the spindle (7) to detect the detection rod (8). 11) also retracts, and the proximity switch (12) detects this and detects that the drill (1) has contacted the work (3). After that, the spindle head (8) is advanced by a predetermined cutting amount for processing.

[0010]

[Problems to be solved by the device]

 All of the above cutting devices detect when the drill (1) contacts the work (3). In the former case, the drill (1) and the detection rod (5) of the pulse encoder (4) are used. Since it is far away, it is not possible to directly detect the movement of the drill (1), and if the shape changes between the contact surface of the drill (1) and the contact surface of the detection rod (5), the detection error Cause

Further, in the latter case, since the movement of the detection rod (11) and the spindle (7) has a one-to-one relationship, it is not possible to detect the subtle movement of the spindle (7) and the detection is performed. There was a case that an error occurred. That is, since the spindle (7) is heavily loaded by the bearings (14) and (15) and the seal (17) mounted on the cap (16), and the spring force of the spring (13) acts, the spindle (7) The responsiveness of 7) is poor, the spindle (7) may move only slightly, and the movement of the detection rod (11) that responds to this in a one-to-one correspondence may be too small to be detected.

Moreover, although the collar (10) and the spindle (7) are returned by the spring (13), in order to improve the responsiveness of the spindle (7) as much as possible, the spring force of the spring (13) is increased. Is set weakly, the spindle (7) may not return only by the force of the spring (13), the operation was unstable, and the reliability was poor.

The present invention is intended to provide a cutting depth control device of a cutting device capable of detecting a subtle movement of a spindle and reliably returning the spindle to perform accurate machining.

[0014]

[Means for Solving the Problems]

 This invention relates to a spindle head, a spindle rotatably mounted on the spindle head and slidably supported in the axial direction, a collar mounted on the spindle rotatably and slidably in the axial direction, and the spindle. A detection box attached to the head, a swingable support in the detection box, one end of which is inserted into the spindle head to engage with the collar, and an axial direction of the detection box. A detection rod engaged with the other end of the lever, a sensor that is attached to the detection box facing the rear end of the detection rod and that detects the detection rod, It is composed of a return cylinder that is attached to the detection box facing the front end and pushes back the detection rod. That.

[0015]

[Action]

 The cutting depth control device with the above configuration moves the spindle head forward during processing, and when the cutting tool (drill) attached to the spindle comes into contact with the work and the spindle retracts, the collar retracts with it. , The lever swings. The detection rod moves in the axial direction due to the swing of the lever, and the sensor detects this and detects that the tool has come into contact with the workpiece. After that, the spindle head is fed by a predetermined amount to perform processing.

If the swing center of the above-mentioned lever is set close to the spindle side, the movement of the detection rod is expanded by the lever ratio with the swing center as the fulcrum, so the behavior becomes large and the detection is performed. Will be easier. After processing, the lever is forcibly returned by the return cylinder via the detection rod, so no malfunction occurs even if the spring force of the spring is reduced.

[0017]

【Example】

 A case where the embodiment of the present invention is applied to a punching device will be described below with reference to FIGS. 1 and 2.

As shown in FIG. 1, the control device causes the spindle (8) to pass through the spindle (7) for mounting the drill (1), and rotates and axially moves through the bearings (14) and (15). The tip of the spindle (7) is supported by the caps (16) (20) attached to the tip end surface of the spindle head (8) so as to be slidably floating, and the driven gear (21) at the rear end of the spindle (7). Is installed.

A collar (10) is rotatably and slidably mounted on a rear shaft portion (7a) of the spindle (7). The collar (10) has an engaging groove (21) formed in a part of its peripheral surface, and a spring hole (22) formed in the axial direction from the rear end surface. Then, the spring (13) is housed in the spring hole (22), and one end of the spring (13) is brought into contact with the spindle head (8) so that the collar (10) is constantly pushed forward, and the color (10) is pushed forward. ), Pushing the spindle (7) forward.

A detection box (23) is attached to the wall surface of the spindle head (8) so as to correspond to the rear shaft portion (7a) of the spindle (7). In the detection box (23), a lever (24) is swingably supported by a pin (25), one end of which is passed through the wall surface of the spindle head (8) and inserted into the inside of the collar (10). It is inserted into and engaged with the engaging groove (21) formed in. The lever (24) is set such that the swing center is close to the spindle (7) side, and the spindle (7) side is longer than the swing center and the detection box (23) side is longer than the swing center. Further, both ends of the lever (24) are formed with spherical peripheral surfaces.

A detection rod (11) is attached to the upper end of the detection box (23) so as to be slidable in the axial direction. The detection rod (11) has a ring-shaped engaging portion (26) at its center, and has shaft portions (27) and (28) protruding from both ends of the engaging portion (26). ) (28) is slidably supported on the detection rod (11). Then, the engaging portion (26) of the detection rod (11) is put on and engaged with the other end of the lever (24).

Further, a sensor such as a proximity switch (12) is attached to the detection box (23) so as to face the rear end of the detection rod (11). The proximity switch (12) emits a signal when the detection rod (11) is separated by a certain distance or more. A return cylinder (30) is attached so as to face the front end of the one-way detection rod (11). The return cylinder (30) is configured to extend at the end of processing to push back the detection rod (11) and return the detection rod (11) to the original position.

In the cutting depth control device having the above configuration, in the state before machining, the collar (10) is advanced by the spring (13) built in the collar (10), and the collar (10) is moved forward. The spindle (7) is also advanced through the spindle (7) and the drill (1) relative to the spindle head (8).

When the spindle head (8) is advanced with the start of processing, the tip of the drill (1) comes into contact with the work, and the spindle (7) moves backward relative to the spring (13). , The collar (10) also moves backward, and as shown in FIG. 2, the lever (24) is swung counterclockwise to move the detection rod (11) forward. Then, the detection rod (11) separates from the proximity switch (12), and the proximity switch (12) emits a signal to detect that the tip of the drill (1) contacts the work (3). After this, the spindle head (8) is fed by a predetermined size and processed.

When the machining is completed and the spindle head (8) retreats to the home position, the return cylinder (30) is extended and the detection rod (11) is pushed back to return the swing lever (24) to the original position. Let After returning, the return cylinder (30) is shortened to prepare for the next processing.

[0026]

[Effect of the device]

 According to this invention, since the movement of the spindle is enlarged by the lever and transmitted to the detection rod, the detection rod moves largely, and even if the movement of the spindle is small, the detection by the sensor is easy and accurate detection can be performed. .. In addition, since the spindle is forcibly returned via the detection rod and lever in the return cylinder after processing, no malfunction occurs. Therefore, the cutting device provided with this kind of cutting depth control device can accurately control the cutting depth from the contact surface even if the processed surface is in a state of some irregularities.

[Brief description of drawings]

FIG. 1 is a sectional view showing a cutting depth control device according to the present invention.

FIG. 2 is a sectional view showing an operating state of the cutting depth control device according to the present invention.

FIG. 3 is a schematic front view showing a general drilling process.

FIG. 4 is a schematic front view showing a general drilling process.

FIG. 5 is an enlarged front view of an essential part showing a problem in drilling.

FIG. 6 is a schematic front view of a drilling device including a pulse encoder.

FIG. 7 is a sectional view showing a conventional cutting depth control device.

FIG. 8 is a sectional view showing an operating state of a conventional cutting depth control device.

[Explanation of symbols]

 7 Spindle 8 Spindle Head 10 Color 11 Detection Rod 12 Sensor 23 Detection Box 24 Lever 30 Return Spring

Claims (1)

[Scope of utility model registration request] 1. A spindle head, a spindle rotatably and axially slidably supported by the spindle head, a collar mounted on the spindle rotatably and axially slidable, and the spindle. A detection box attached to the head, a lever swingably supported in the detection box, one end of which is inserted into the spindle head to engage with the collar, and an axial direction of the detection box. A detection rod that is slidably attached and has the other end of the lever engaged, a sensor that is attached to the detection box facing the rear end of the detection rod and that detects the detection rod, and a front end of the detection rod. And a return cylinder attached to the detection box so as to oppose the detection rod and returning the detection rod. Cutting depth control device that cutting apparatus.