JPH04322966A - Brush wear compensation device for deburring machines - Google Patents

Abstract

PURPOSE:To perform a job for compensation to define the bristle length of a brush automatically as well as to stabilize the degree of deburring quality by installing a measuring plate, retracting as pushing by the brush going forward together with a spindle, and a probe, coming into contact with this measuring plate and outputting a contact signal, both in and around an engaging member. CONSTITUTION:A brush holder 21 is attached to a spindle of a burring machine body, and a holding plate 22 is attached to this holder 21 shiftably in the axial direction. An engaging recess 32 fittable in an engaging projection 26 at one end of a screw shaft 24 is installed in the upper end of an engaging member 33 set up in a moving range of this spindle. In a state that the engaging projection part 26 and the engaging recess 32 are engaged with each other and thereby rotation of the screw shaft 24 is regulated, the spindle is rotated and the screw shaft 24 is screwed in the brush holder 21, while the spindle is advanced forward as far as a portion for this screwed variable, having a position of the plate 22 remained unchanged, and a brush 20 is projected out of the holding plate 22. With this projected brush 20, the measuring plate 37 is depressed till it reaches a probe 40, thus each bristle length is kept constant.

Description

[Detailed description of the invention]

0001

[Industrial Field of Application] The present invention relates to a deburring machine that automatically removes burrs existing on a workpiece by brush polishing, and more specifically, to a deburring machine that automatically removes burrs existing on a workpiece by brush polishing. Regarding equipment.

0002

2. Description of the Related Art This type of deburring machine continuously performs deburring work with a preset brush cutting depth, so it is necessary to periodically correct the amount of brush wear. Conventionally, the amount of brush wear has generally been corrected by manually measuring the amount of brush wear using a measuring tool, and adjusting the feed amount on the machine side based on the measurement results. However, in such correction of the amount of brush wear, it not only takes time to measure the amount of wear, but also measurement errors are likely to occur, resulting in many problems in terms of productivity and accuracy. Therefore, for example, Japanese Patent Application Laid-Open No. 2-29471 discloses that a conductive brush is used as the polishing brush, and the contact position is electrically detected by bringing it into contact with a conductive reference body.
A brush wear amount correction device is shown that corrects the amount of wear by moving the conductive brush to an appropriate position based on this position.

0003

[Problems to be Solved by the Invention] However, according to the brush wear amount correction device disclosed in the above-mentioned publication, the correction is made by simply moving the brush to an appropriate position.
Repeated corrections gradually shorten the bristles of the brush, and as a result, the stiffness of the brush changes, resulting in uneven grinding allowances or scratches on the workpiece, making it difficult to achieve the desired quality. The problem was that it was difficult to secure.

The present invention has been made to solve the above-mentioned conventional problems, and its purpose is to be able to correct the amount of wear on the brush so that the length of the bristles remains constant; It is an object of the present invention to provide a brush wear amount correction device for a deburring machine that contributes to stabilizing deburring quality.

[0005]

[Means for Solving the Problems] In order to achieve the above object, the present invention connects a holding plate movably in the axial direction to a brush holder mounted on the main shaft of a main body of a deburring machine, and attaches the holding plate to the brush holder. The distal end of the implanted brush is inserted through the holding plate and protrudes forward thereof, and one end of a screw shaft extending on the axis of the brush holder is rotatably coupled to the holding plate. screwing the other end of the screw shaft into the brush holder, positioning a first engaging portion at one end of the screw shaft on the front surface of the holding plate;
disposing an engaging member having a second engaging part at its tip that can be fitted into the first engaging part of the screw shaft in a movement range of the main shaft;
Further, a measuring plate that retreats by being pushed by a brush that advances together with the main shaft, and a measuring element that comes into contact with the retreating measuring plate and outputs a contact signal are disposed around the engaging member. .

[0006]

[Operation] In the brush wear amount correction device for a deburring machine configured as described above, the holding plate is brought close to the engaging member by moving the main shaft, and the first engaging portion of the screw shaft and the engaging member are After fitting with the second engagement part, if the main shaft is rotated counterclockwise or clockwise, the rotation of the screw shaft is stopped by the engagement member, so that the screw shaft can be screwed into or screwed into the brush holder. The holding plate is loosened, and the holding plate moves toward or away from the brush holder accordingly. Therefore, if the main shaft is moved in the axial direction by an amount commensurate with the movement of the holding plate in synchronization with the movement of the holding plate, the absolute position of the holding plate will remain unchanged and the amount of protrusion of the brush from the holding plate will change. , Therefore, if the amount of protrusion of the brush is changed until the measuring plate contacts the measuring tip, and the rotation and movement of the main shaft is stopped by the contact signal of the measuring tip, the amount of protruding of the brush from the holding plate, that is, the length of its bristles, can be changed. becomes the desired value, and the amount of brush wear is corrected.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Examples of the present invention will be described below with reference to the accompanying drawings.

FIG. 3 shows the overall structure of a deburring machine equipped with a brush wear amount correction device according to the present invention. In the figure, 1 is a machining center as a deburring machine, and a machine main body 3 is installed on a base 2.
It is generally composed of a processing section 4, and a control section 5 installed outside the base 2. The machine main body 3 includes an X-Y table 6 installed on a base 2, a column 7 erected on this X-Y table 6, and a vertical direction (Z
The main shaft 9 is provided with an elevating head 8 mounted so as to be movable in the axial direction, and a main shaft 9 is attached to the distal end of the elevating head 8 extending in the horizontal direction so as to face downward. The main shaft 9 is
It is rotatably driven by a drive means built into the lifting head 8, and a brush holder 21, in which a brush 20, which will be described in detail later, is implanted, is removably attached to the main shaft 9. In addition, the working section 4 has a fixed processing table 10.
A jig 12 for holding a workpiece 11 is placed on the processing table 10. on the other hand,
The control unit 5 has a built-in numerical control (NC) device 13, and this N
Commands from the C device 13 are outputted to the drive sources 15, 15 of the X-Y table 6 and the drive source 16 of the elevating head 8 through each wiring 14. The machine main body part 3 is NC
The main shaft 9 is moved to the processing table 10 by the command from the device 13.
The brush 20 is moved to the upper workpiece 11 side, and the brush 20 is also moved in a predetermined order to remove burrs from the workpiece 11.

The brush holder 21 is shown in FIGS. 1 and 2.
As shown in FIG. 2, a tapered shank portion 21a serving as an insertion portion into the main shaft 9 and a disc-shaped holding portion 21 in which a brush 20 is implanted are provided.
It consists of b. The brush 20 is attached to the brush holder 2
A disc-shaped holding plate 22 disposed at a predetermined interval is inserted into the holding portion 21b of No. 1 and extends downward. The holding plate 22 has a plurality of (two in this case) guide rods 23 protruding from the back surface of the holding plate 22, which are slidably inserted into the holding part 21b of the brush holder 21, so that the holding plate 22 can be attached to the brush holder 21 in its axial direction. movably connected. Further, one end of a screw shaft 24 extending along the axis of the brush holder 21 is rotatably coupled to the center of the back surface of the holding plate 22, and the other end of this screw shaft 24 is connected to the center of the back surface of the brush holder 21. It is screwed into a female threaded member 25 attached to the mouth of the shaft hole 21c. With such a mounting structure of the holding plate 22, when the brush holder 21 and the threaded shaft 24 are now rotated relative to each other, the threaded shaft 24 will rotate against the female threaded member 2.
5 is screwed in or loosened, and the holding plate 22 moves arbitrarily in the axial direction of the brush holder 21 accordingly, and as a result, the protruding length of the brush 20 from the holding plate 22, that is, the bristles length a, is adjusted. will be done. The central part of the holding plate 22 on the side opposite to the brush holder 21 has a cup-shaped recess 22a, and the bottom of the recess 22a has an engagement protrusion in the form of a hexagonal head integrally provided at one end of the screw shaft 24. (first engaging portion) 26 is arranged.

[0010] However, on the processing table 10,
A correction jig 30 for correcting the amount of brush wear is installed adjacent to the working part 4. This correction jig 30 is shown in FIG.
As shown in detail in , the jig main body 31 has a cylindrical shape with a bottom and is fixed on the processing table 10 . The jig body 31 is arranged with its opening facing upward, and has an engagement recess (second engagement part) 32 at its upper end that can fit into the engagement convex part 26 of the holding plate 22. Socket (engaging member)
33 is held non-rotatably and slidably in the axial direction. The socket 33 has a large diameter portion 33a on the base side accommodated in the jig body 31, and is prevented from coming off from the jig body 31 by a lid 34 attached to the open end of the jig body 31. A spring 35 that biases the socket 33 upward is housed in the jig body 31, and the socket 33 is biased by this spring 35 and normally moves its step 33b toward the lid 34.
It is designed to be held at the rising end which is brought into contact with. Further, a stopper 36 is provided at the upper end of the jig main body 31.

The control unit 5 of the machining center 1 has a built-in switching circuit that counts the number of brush machining operations until the brush 20 reaches an allowable length due to wear and switches from machining operation to correction operation when a predetermined count is reached. By switching to this correction operation, the main shaft 9 of the machine main body 3 moves toward the jig main body 31 according to the program input to the NC device 13, and the holding plate 22 is moved toward the stopper 3.
6 (FIG. 1). This position L becomes the original position for correction to be described later, and with the holding plate 22 positioned at this position L, the engagement convex portion 26 of the screw shaft 24 bottoms out in the engagement recess 32 of the engagement member 33. It is inserted to a predetermined depth so that its rotation is restricted. Therefore, if the main shaft 9 is rotated in the screwing direction of the screw shaft 24 at this corrected original position L, and the main shaft 9 is simultaneously lowered by the screwing amount of the screw shaft 24, the holding plate 2
remains at the corrected original position L, and the protruding length of the brush 20 from the holding plate 22, that is, the bristle length a, increases. In this embodiment, a program for realizing this synchronous feeding is input to the NC device 13 of the machining center 1.

The jig body 31 also has a measuring plate 37 at its upper end.
An elevating body 38 to which is fixed is slidably fitted onto the outside, and this elevating body 38 is urged upward by a spring 39. A notch 38a extends in the axial direction in a part of the peripheral wall of the elevating body 38.
A bracket 31a protruding from the outer periphery of the jig main body 31 is inserted into the notch 38a. A measuring element 40 is attached to the upper surface of the bracket 31a, and this measuring element 40 contacts the measuring plate 37 that descends against the biasing force of the spring 39, and outputs a contact signal to the NC device 13 via the wiring 17. It is supposed to be done. Thus, when the holding plate 22 is positioned at the corrected original position L as described above, the tip of the brush 20 comes into contact with the measuring plate 37 and pushes it down. The measuring element 40 is pushed down by the brush 20 onto the measuring plate 37.
The tip position is set at a position where exactly a predetermined bristles length of the brush 20 is obtained when the brush 20 comes into contact with the bristles. however,
The bristles length a of the brush 20 is shortened by the wear length. Therefore, when the holding plate 22 is positioned at the corrected original position L, there is a gap between the measuring plate 37 and the measuring tip 40 due to the wear length. A gap δ (FIG. 1) corresponding to this amount is formed. In other words, if the brush 20 is made to protrude from the holding plate 22 by an amount that eliminates this gap δ, the amount of brush wear can be corrected.

It should be noted that the jig main body 31 is equipped with a lifting bar 41 . The lift bar 41 has narrow diameter portions 41a and 41b at its upper and lower sides, and has an upper narrow diameter portion 41a.
is inserted into the shaft hole 33c provided in the socket 33, while the lower narrow diameter portion 41b is inserted through the through hole 31b provided in the bottom of the jig body 31, and held between the socket 33 and the jig body 31. has been done. This lifting bar 41 is
Forced upward by a spring 42, the upper narrow diameter portion 4 is normally
The upper end of 1a slightly protrudes into the engaging recess 32 of the socket 33. Also, the lifting bar 4 is located outside the jig main body 31.
An abnormality detector 43 is arranged on the extension of 1. This abnormality detector 43 contacts the lower narrow diameter portion 41b of the lifting bar 41 that descends against the biasing force of the spring 42, and outputs a contact signal to the NC device 13 via the wiring 18. The lift bar 41 and the abnormality detector 43 are provided to prevent the main shaft 9, that is, the holding plate 22, from falling below the corrected original position L and colliding with the stopper 36 due to an abnormality in the NC device 13. When the holding plate 22 collides with the stopper 36, the lifting bar 41 is pushed down by the engaging protrusion 26 of the screw shaft 24 and comes into contact with the abnormality detector 43, and the abnormality detector 43 outputs a contact signal. Therefore,
In this embodiment, the machining center 1 has a function of stopping the operation of the machine body 3 upon receiving a signal from the abnormality detector 43.
The NC control unit 13 is provided with the following information.

Furthermore, an air sensor 44 is provided on the inner surface of the lid 36 of the jig main body 34. This air sensor 44
is for detecting whether or not the engagement protrusion 26 and the engagement recess 32 are securely connected when the holding plate 22 is positioned at the correction position L. It is electrically connected to the control unit 5 of No. 1. That is, when the holding plate 22 is positioned at the corrected position L, if the engagement protrusion 26 and the engagement recess 32 are out of phase in the rotational direction, the engagement protrusion 26 will move into the engagement recess 3.
2, the engagement protrusion 26 allows the socket 3 to be inserted into the socket 3.
3 is pushed down against the urging force of the spring 35, and a gap β is formed between the stepped surface 33b of the socket 33 and the lid 34 of the jig main body 31. When this gap β is formed, an air leak occurs in the air sensor 44, the air switch is turned off, and incomplete coupling between the engagement protrusion 26 and the engagement recess 32 is detected. The control unit 5 of the machining center 1 has a function of stopping the descent of the main shaft 9 in response to an off signal from the air switch, and also rotating the main shaft 9. This operation causes the engagement protrusion 26 and the engagement recess 32 to are in phase with each other in the rotational direction, and the two are completely coupled as shown in FIG.

The operation of the brush wear amount correcting device constructed as described above will be explained below.

[0016] At the same time as the brush machining count reaches a predetermined value, the machining center 1 switches from machining operation to correction operation, and its main shaft 9 moves toward the jig main body 31 according to the program input to the NC device 13. The holding plate 22 is positioned at a predetermined corrected original position L, and the engagement protrusion 26 of the screw shaft 24 fits into the engagement recess 32 of the engagement member 33. At this time, the engagement convex portion 26 is connected to the engagement concave portion 3.
2, the socket 33 will descend during the descent of the main shaft 9, and the air sensor 44 will detect this descent, turn off the air switch, and stop the descent of the main shaft 9. Thereafter, the main shaft 9 rotates to engage the engagement convex portion 26 and the engagement concave portion 32.
When these are connected, the air switch is turned on, the machining center resumes the lowering operation, and the holding plate 22 is positioned at the original position L described above. At this time, if the main shaft 9 descends more than necessary due to an abnormality in the NC device 13, the lifting bar 41 is lowered by the engagement protrusion 26.
is pushed down and contacts the abnormality detector 43, and the machining center 1 is stopped by the contact signal.

After the holding plate 22 has been positioned to the corrected original position L, the main shaft 9 rotates in the screwing direction of the screw shaft 24, and in synchronization with this, the main shaft 9 is lowered by the screwing amount of the screw shaft 24. For example, the absolute position of the holding plate 22 remains unchanged, and the protruding length of the brush 20 from the holding plate 22, that is, the bristle length a increases. This brush 2
The measuring plate 37 is gradually pushed down by the increase in the hair length a of 0, and finally the measuring plate 37 comes into contact with the measuring stylus 40, and a contact signal of the measuring stylus 40 is sent to the NC device 13. The NC device 13 immediately stops the descent of the main shaft 9 in response to the contact signal, and at this stage the amount of wear on the brush 20 is automatically corrected. In this embodiment, in particular, the socket 33 is provided so as to be floating, and the abnormality detector 43 and the air sensor 44 are
Since abnormal operation of the device is detected by the above method, the reliability of the device can be significantly improved.

In the above embodiment, the first engaging part 26 of the screw shaft 24 was provided as a convex part, and the second engaging part 32 of the socket 33 was provided as a concave part. The first engaging portion 26 of the shaft 24 may be provided as a concave portion, and the second engaging portion 32 of the socket 33 may be provided as a convex portion. Furthermore, in the above embodiments, the target is a deburring machine in which the main shaft 9 faces downward, but the direction of this main shaft can be arbitrary; for example, it goes without saying that the target can be a deburring machine in which the main shaft faces in the horizontal direction. In this case, the entire measurement jig 30 is installed horizontally.

[0019]

[Effects of the Invention] As explained above in detail, according to the brush wear amount correction device according to the present invention, it is possible to automatically perform correction to keep the bristles length of the brush constant.
Changes in the rigidity of the brush are suppressed, the grinding allowance will not be uneven, the workpiece will not be damaged, and the deburring quality will be extremely stable.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a brush wear amount correction device according to the present invention.

FIG. 2 is a sectional view taken along the line II-II of FIG. 1;

FIG. 3 is a schematic diagram of a deburring machine equipped with the present brush wear amount correction device.

[Explanation of sign]

1 Deburring machine (machining center) 3 Machine main body part 4 Workpiece 5 Control part 9 Main shaft 20 Brush 21 Brush holder 22 Holding plate 24 Screw shaft 26 First engaging part 31 Jig main body 32 Second engaging part 33 Engagement member 37 Measuring plate 40 Measuring head

Claims (1)

[Claims] 1. A holding plate is connected to a brush holder mounted on the main shaft of a deburring machine main body so as to be movable in the axial direction of the brush holder, and the tip of the brush implanted in the brush holder is inserted through the holding plate. one end of the screw shaft extending along the axis of the brush holder is rotatably coupled to the holding plate, and the other end of the screw shaft is screwed to the brush holder. , a first engaging portion at one end of the screw shaft is located on the front surface of the holding plate, and a second engaging portion that can be fitted into the first engaging portion of the screw shaft within a movement range of the main shaft. An engaging member having a tip thereof is disposed, and around the engaging member, a measuring plate that retreats by being pushed by the brush that advances together with the main shaft comes into contact with the retreating measuring plate and outputs a contact signal. A brush wear amount correction device for a deburring machine, characterized in that a measuring head is provided.