JP6203626B2 - Chamfering machine - Google Patents

Description

  The present invention relates to a chamfering machine that is mainly used for chamfering a corner of a workpiece by introducing compressed air and rotating a cutter blade.

  Conventionally, a hand-type chamfering machine used in chamfering processing is configured by mounting a chamfering cutter blade, which has a cutter tip attached to a cutter table, to the tip of an output shaft that is driven to rotate by electricity or compressed air. ing. Then, the operator holds the chamfering machine in hand and rotates the cutter blade when chamfering, and presses the cutting blade provided at the tip of the cutter tip against the workpiece to cut the target location. Chamfer.

  A hand-type chamfering machine that performs such chamfering processing has been well known. For example, as a chamfering machine for performing R chamfering using compressed air as a power source, there is one disclosed in Patent Document 1, for example. . In this case, a cutter is rotatably attached to the chamfering machine main body, and a cutter tip is attached to the cutter so as to be replaceable.

  Patent Document 1 further discloses a configuration in which a rotary base (guide plate) is attached to the chamfering machine body, and a guide roller is attached coaxially with the cutter so as to be relatively rotatable. By bringing the horizontal and vertical surfaces of the workpiece into contact with the rotary base and the guide roller, stable chamfering can be performed with high accuracy.

  For reference, a polishing tool using compressed air as a power source is disclosed in, for example, Patent Document 2. This splits the compressed air for operation into two passages in the main body, one is used as the power of the air motor, and the other is blown out from a vent hole provided in the center of the polishing surface through the air passage in the motor rotation shaft. It is used as cooling air.

JP-A-8-57707 JP-A-8-11045

  However, in the chamfering machine disclosed in Patent Document 1, the cutter tip becomes hot due to the friction between the workpiece and the cutting blade, and depending on the material of the workpiece (for example, aluminum material), the chip of the workpiece is welded to the cutter tip. In some cases, excessive adhesion may cause rotation problems. Further, there is a possibility that the parts are worn or damaged by the attached chips. When such a problem occurs in a site where the chamfering work is continuously performed for a long time, the work efficiency is lowered, and the part replacement cycle is accelerated, resulting in high costs.

  By the way, in the polishing tool of the above-mentioned patent document 2, the effect of cooling both the tool side and the surface to be polished (workpiece) side and scattering polishing debris to remove it from the work surface can be obtained. However, since it is necessary to provide a branch passage in the tool body and further to provide an air passage in the motor rotation shaft, the structure of the tool becomes extremely complicated. In addition, since very high assembly accuracy is required to prevent air leakage, there is a problem that the manufacturing cost is significantly increased.

  Accordingly, the present invention provides a cooling effect for the cutter blade, can prevent the workpiece chips from adhering to the cutter blade, etc. with the simplest possible structure, and the chips are locally accumulated to wear the parts. Another object is to provide a chamfering machine that can suitably prevent a problem of being damaged.

  The present invention includes a chamfering machine main body provided with a driving means that is rotationally driven by compressed air, a compressed air supply unit for introducing the compressed air into the driving means, and a discharge of the compressed air from the chamfering machine main body. A cutter blade is attached to the drive means, and the chamfering machine body is adjacent to the cutter blade at a position adjacent to the surface of the workpiece. A chamfering machine in which a contact guide plate having a surface on one side is provided so as to surround the cutter blade, and a main plate portion is disposed on a plate surface opposite to the contact guide surface in the contact guide plate. A cover portion is disposed opposite to the main plate portion of the cover portion and the corresponding contact guide plate, and a fine gap surrounding the cutter blade is formed so that the fine gap serves as a ventilation portion. The ventilation portion and the compressed air discharge portion are communicated with each other by an exhaust pipe disposed outside the chamfering machine main body, so that the exhaust discharged from the compressed air discharge portion passes through the exhaust pipe. The chamfering machine is characterized in that the chamfering machine reaches the ventilation section and is further discharged toward the cutter blade through the ventilation section.

  In such a configuration, the compressed air that is the drive source of the chamfering machine is guided from the compressed air discharge part to the ventilation part through the exhaust pipe, and is discharged toward the cutter blade. A cooling effect is obtained by the air flow, and excessive heat generation of the cutter blade is suppressed. In addition, the air flow favorably blows off the chips to be attached to the cutter blade toward the outside, which is suitable for the malfunction of the cutter blade caused by the chips and the shortening of the part replacement cycle. Can be prevented.

  More specifically, the ventilation portion is provided on the main body side of the contact guide plate that performs a guide function for the workpiece, and is formed so as to surround the cutter blade. Will be sprayed from all directions. For this reason, it becomes difficult for chips to stay around the cutter blade, the chip cleaning work is simplified, and the burden of maintenance work is reduced.

  In the first place, since the air flow uses compressed air used for rotating the cutter blade, the supplied compressed air can be used without waste. In addition, since the said exhaust pipe is arrange | positioned outside a chamfering machine main body, the internal structure of a chamfering machine main body does not become complicated. Further, by adopting such a configuration, it can be applied to a chamfering machine main body, which is a general-purpose product, at low cost.

  The opening end of the exhaust pipe on the side of the ventilation portion opens toward the plate surface of the contact guide plate, and the exhaust discharge direction in the ventilation portion is substantially orthogonal to the rotation axis of the cutter blade. It is desirable that the direction is determined.

  With the above configuration, the exhaust discharged to the ventilation portion is once blown to the contact guide plate, and then travels around the ventilation portion toward the cutter blade. Thus, by adopting a configuration in which the exhaust discharged to the ventilation portion is once blown to the abutting guide plate and temporarily stays in the ventilation portion, the exhaust is directly blown toward the cutter blade. In comparison, it is possible to reduce the difference in atmospheric pressure at each location around the cutter blade. Then, the exhaust discharged to the cutter blade is rectified as much as possible, and the unevenness of the airflow in the ventilation section is suitably suppressed, effectively eliminating the problem that chips are likely to accumulate partially. It becomes possible to do. Further, a large amount of chips adhere to the cutter blade in use. In order to blow off the chips, it is desirable to send exhaust toward the cutter blade in a direction substantially perpendicular to the rotation axis of the cutter blade. . At first glance, blowing off the chips adhering to the cutter blade to the outside (work space) is more likely to cause chips to blow into the chamfering machine main body when sending exhaust toward the outside in the direction along the rotation axis. It seems to be reasonable. However, since the cutter blade in use rotates at a high speed and a large centrifugal force acts, in order to blow away the chips adhering to the cutter blade in such a situation, exhaust the exhaust in the direction according to the present invention described above. Is required.

  Further, it is desirable that the outer peripheral edge of the ventilation portion is defined by an inner wall surface of an arc-shaped cover portion centering on the cutter blade.

  By adopting such a configuration, exhaust can be discharged to the entire circumference of the cutter blade without any bias.

  According to the above configuration, the cutter tip and the workpiece can be suitably cooled with a simpler configuration than the conventional one, and chips can be blown away, so that the tool life can be extended.

It is a longitudinal cross-sectional view which shows a chamfering machine. It is a figure which shows a cover, (a) is a bottom view, (b) is a longitudinal cross-sectional view. It is a figure which shows a flange base, (a) is a bottom view, (b) is a longitudinal cross-sectional view. It is a partial expanded longitudinal cross-sectional view which shows a ventilation part. It is a partial expanded cross-sectional view which shows a ventilation part.

  Embodiments embodying the present invention will be described in detail below. In addition, this invention is not limited to the Example shown below, A design change is possible suitably.

  As shown in FIG. 1, the chamfering machine 1 includes a chamfering machine main body 2 made of a metal cylinder having an L shape in side view. A compressed air supply unit 3 to which a compressed air supply hose (not shown) is connected is provided at the base end of the chamfering machine main body 2.

  Further, at a position adjacent to the compressed air supply unit 3, a ring-shaped operation switch 4 capable of switching between introduction and stoppage of compressed air into the chamfering machine main body 2 is disposed. Then, by appropriately operating the operation switch 4, the amount of compressed air introduced is appropriately controlled.

  The chamfering machine main body 2 is provided with driving means 13. More specifically, the drive means 13 includes a drive shaft 9 having a spindle 8 that rotates at a high speed by the flow of compressed air. Further, a bevel gear 10 is provided at the tip of the drive shaft 9. On the other hand, the drive means 13 also includes an output shaft 11 orthogonal to the axial direction of the drive shaft 9. A bevel gear 12 is provided at the base end of the output shaft 11, and the bevel gear 12 of the output shaft 11 and the bevel gear 10 of the drive shaft 9 are engaged with each other. When the drive shaft 9 rotates, the rotational force is transmitted to the output shaft 11.

  A cutter blade 14 is attached to the tip of the output shaft 11 together with a guide bearing 15. The cutter blade 14 is formed by fastening a plurality (three) of cutter chips 16 to a cutter base 17 with screws. The cutter tip 16 is for R chamfering, but of course, C chamfering may be used.

  Further, the chamfering machine main body 2 is provided with a substantially annular flange base 18 as shown in FIG. 3 so as to surround the cutter blade 14. Specifically, a screw is inserted through a screw hole 18 a provided in a side portion of the flange base 18, and the flange base 18 is fixed to the chamfering machine body 2.

  Furthermore, a screw hole 18b is formed at the lower end of the flange base 18, and a substantially disk-shaped contact guide plate 20 is fixed via a screw that is screwed into the screw hole 18b. In addition, a circular opening 21 in which the cutter blade 14 and the guide bearing 15 are arranged is provided in the center of the contact guide plate 20, and the contact guide plate 20 is in the fixed state. 14 is disposed so as to surround the cutter blade 14 and the tip of the cutter blade 14 protrudes from the contact guide plate 20 toward the workpiece W side. During the work, one surface of the workpiece W comes into contact with the contact guide surface 19 formed on the surface of the contact guide plate 20.

  In addition, the chamfering machine main body 2 is provided with a plurality of discharge ports 22 through which compressed air supplied to rotate the spindle 8 of the drive shaft 9 is discharged. Furthermore, these discharge ports 22 are covered with a ring body 23 that is rotatably fitted to the chamfering machine main body 2, and through a compressed air discharge portion 24 having a through hole provided in the ring body 23. Thus, the compressed air after rotating the spindle 8 is discharged to the outside as exhaust.

The main part of the present invention will be described below.
A circular cover 25 having a main plate portion as shown in FIG. 2 is placed on the plate surface opposite to the contact guide surface 19 of the contact guide plate 20 (that is, the surface on the chamfering machine main body 2 side). Yes. Specifically, a circular opening 25b is provided substantially at the center of the main plate portion of the cover 25, and the flange base 18 is disposed in the opening 25b so that the inner peripheral surface of the opening 25b is formed. The flange base 18 is in contact with the outer peripheral surface.

  Further, in the cover 25, an opening 25d having a diameter smaller than that of the opening 25b is provided in a penetrating manner next to the opening 25b. An exhaust pipe 27 made of a pipe material is connected between the opening 25d and the compressed air discharge part 24 of the chamfering machine main body 2 described above.

  In addition, a wall portion 25 a protruding toward the contact guide plate 20 is formed along the outer edge at the outer peripheral edge of the cover 25, and the tip of the wall portion 25 a contacts the contact guide plate 20. It has been. The cover 25 is fixed to the flange base 18 through screws inserted into screw holes 25c provided in the cover 25. The cover 25 constitutes a cover portion according to the present invention.

  Further, a fine gap is formed between the abutment guide plate 20 and the main plate portion of the cover 25, and a ventilation portion 26 for communicating the opening 25d of the cover 25 and the periphery of the cutter blade 14 is formed. Has been. As shown in FIGS. 4 and 5, the ventilation portion 26 is formed so as to surround the cutter blade 14, and the outer periphery of the cutter blade 14 is arranged to face the ventilation portion 26.

  As shown in FIG. 3b, a plurality (four) of notches 18c are formed at equal intervals on the outer edge of the flange base 18 on the cutter blade 14 side, and the flange base 18 as shown in FIG. And a fine gap surrounded by the abutment guide plate 20 and the cover 25 communicate with each other in the flange base 18 to constitute a ventilation portion 26 as a whole.

  In the above configuration, the compressed air introduced into the chamfering machine body 2 from the compressed air supply unit 3 is discharged as exhaust from the compressed air discharge unit 24 and guided into the exhaust pipe 27. Further, as shown in FIGS. 4 and 5, the exhaust reaches the ventilation portion 26 formed between the contact guide plate 20 and the cover 25, and is substantially orthogonal to the rotation axis of the cutter blade 14. It is discharged to the opening 21 side of the abutment guide plate 20 along the direction of the contact. And since the said cutter blade 14 is arrange | positioned in this opening 21, while the workpiece | work W and the cutter chip | tip 16 are cooled by this exhaust_gas | exhaustion, the chip | tip adhering to this cutter chip | tip 16 is not the chamfering machine main body 2 side but an outer side. Scatter towards

  Here, since the opening end of the exhaust pipe 27 on the ventilation section 26 side opens toward the plate surface of the contact guide plate 20, the exhaust does not go directly to the cutter blade 14, but temporarily After striking the contact guide plate 20, it tries to spread all around. Therefore, the exhaust gas discharged to the ventilation portion 26 once stays in the ventilation portion 26, and it becomes possible to reduce the difference in atmospheric pressure at each location around the cutter blade 14 as much as possible. If it does so, it will become possible to eliminate effectively the problem that the exhaust_gas | exhaustion discharge | released to this cutter blade 14 is rectified appropriately, and chips accumulate partially. Further, since exhaust gas is discharged in a direction substantially orthogonal to the rotation axis of the cutter blade 14, even if a large centrifugal force acts on the cutter blade 14 rotating at high speed, the chips adhering to the cutter blade are preferably removed. Can be blown away.

  Further, as shown in FIG. 5, the outer peripheral edge of the ventilation portion 26 is defined by the inner wall surface of the wall portion 25 a of the arc-shaped cover 25 that is substantially centered on the cutter blade 14. The exhaust that has reached is smoothly discharged over the entire circumference of the cutter blade 14 without unevenness.

  Further, since the exhaust pipe 27 is provided outside the chamfering machine main body 2, the internal structure of the chamfering machine main body 2 does not become complicated. Therefore, the above configuration can be easily applied to a general-purpose chamfering machine that has been used conventionally, and the manufacturing time of the chamfering machine 1 is not significantly increased, and the manufacturing cost is not significantly increased. .

  The number of ventilation notch grooves 18c provided in the flange base 18 is not particularly limited as long as the contact guide plate 20 can be appropriately fixed. Further, the opening 25b of the cover 25 with which the outer peripheral surface of the flange base 18 abuts is provided eccentrically with respect to the center of the cover 25 as shown in FIG. 2, but is not limited to this position. The position can be changed as appropriate within a range in which spray accumulation does not occur and chips or the like are not accumulated there.

  Other than the above embodiment, the shape and size of each member can be changed as appropriate. The member to be used may be made of metal or appropriately made of synthetic resin, but is preferably made of metal from the viewpoint of strength and durability. Further, for example, an outside outlet whose opening area can be changed is provided separately at an appropriate place where the exhaust passes, and this can be used as an exhaust adjustment mechanism to adjust the flow rate of the exhaust led to the ventilation unit 26. Furthermore, a silencer function such as a silencer may be added to the exhaust control mechanism.

DESCRIPTION OF SYMBOLS 1 Chamfering machine 2 Chamfering machine main body 3 Compressed air supply part 13 Drive means 14 Cutter blade 19 Contact guide surface 20 Contact guide plate 24 Compressed air discharge part 25 Cover (cover part)
26 Ventilation section 27 Exhaust pipe W Work

Claims (3)

The chamfering machine main body provided with driving means that is rotationally driven by compressed air includes a compressed air supply unit for introducing compressed air into the driving means, and a compression for discharging compressed air from the chamfering machine main body. An air discharge portion, and a cutter blade is attached to the driving means, and a contact guide surface that contacts one surface of the workpiece is located on one side of the chamfering machine main body at a position adjacent to the cutter blade. A chamfering machine provided with a contact guide plate having a cutter blade surrounding the cutter blade,
A cover portion having a main plate portion is disposed on a plate surface opposite to the contact guide surface of the contact guide plate, and the cutter blade is disposed between the main plate portion of the cover portion and the corresponding contact guide plate. A surrounding fine gap is formed and the fine gap is used as a ventilation portion.
The ventilation portion and the compressed air discharge portion are communicated with each other by an exhaust pipe disposed outside the chamfering machine main body, so that the exhaust discharged from the compressed air discharge portion passes through the exhaust pipe. A chamfering machine characterized in that it reaches the ventilation section and is further discharged toward the cutter blade through the ventilation section. An opening end of the exhaust pipe on the side of the ventilation portion opens toward the plate surface of the contact guide plate, and a direction in which the exhaust discharge direction in the ventilation portion is substantially orthogonal to the rotation axis of the cutter blade The chamfering machine according to claim 1, which is defined in claim 1. 3. The chamfering machine according to claim 1, wherein an outer peripheral edge of the ventilation portion is defined by an inner wall surface of an arc-shaped cover portion that is substantially centered on the cutter blade.

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