JP4089796B2 - Back face / chamfering equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
  The present invention is a counterbore and chamfering process.Regarding equipmentIn particular, the processing efficiency is improved and the flexibility of processing is enhanced.
[0002]
[Prior art]
Conventionally, for example, a machine tool such as an NC processing machine has been used to perform various types of automatic countersinking devices and automatic countersinking and chamfering of the prepared hole after machining the prepared hole. Chamfering devices are in practical use. FIG. 11 is a view showing back spot facing processing of the pilot hole D by a pressing type automatic back spot facing processing apparatus which is an example of a back spot facing processing tool. This processing apparatus includes a cutting tool attachment 3 having a cutting blade 2 as a cutting tool at the tip of a tool 1 that is detachably attached to a spindle of a machine tool via an arbor (not shown). The cutting blade 2 is raised and lowered in the tool radial direction as indicated by an arrow A by the operation of a blade tool retracting mechanism (not shown) provided in the tool attachment 3 and connected to the tool 1. . That is, the cutting blade 2 rises by pressing the end surface 1a of the tool 1 against the surface Wa of the workpiece W, and further falls down by pressing the end surface 1a against the surface Wa of the workpiece W once more, and enters the cutting tool attachment 3. Immerse yourself.
[0003]
Now, in order to perform a counterbore machining on a pilot hole D formed on one surface of a U-shaped workpiece W as shown in the figure, (1) The tool 1 is moved as indicated by an arrow B while the cutting blade 2 is tilted. Advance the blade attachment 3 through the pilot hole D. {Circle around (2)} The tool 1 is further moved forward so that the end face 1 a is pressed against the surface Wa of the workpiece W to raise the cutting edge 2. {Circle around (3)} Next, the tool 1 is moved backward while the cutting edge 2 is raised, and the countersinking process is carried out with a predetermined depth while rotating the tool 1 with the cutting edge 2 placed against the back side of the workpiece W. (4) When machining is completed, the tool 1 is moved forward to pull the cutting blade 2 away from the back surface of the workpiece W, and the tool 1 is further moved forward to press the end surface 1a against the surface of the workpiece W to tilt the cutting blade 2. {Circle around (5)} The procedure of retracting the tool 1 and pulling out the blade attachment 3 from the workpiece W is required.
[0004]
FIG. 12 is a diagram showing back spot facing processing of the pilot hole D by a reverse type automatic back spot facing processing device as another conventional example. In this case, the cutting blade 2 as a cutting tool that is retractable at the tip of the cutting tool attachment 3 attached to the tool 1 is in an unlocked state in which the cutting tool is retracted by the operation of a cutting tool protruding and retracting mechanism (not shown). On the other hand, when the main shaft rotates forward, it is locked while protruding. In order to perform back surface machining on the prepared hole D of the workpiece W with this processing apparatus, (1) First, the main shaft is reversely rotated. As a result, the cutting blade 2 enters an unlocked state and protrudes outward by the action of the rotating centrifugal force. In this state, the blade attachment 3 is inserted into the prepared hole D of the workpiece W. (2) Since the cutting blade 2 is in the unlocked state, when the tip of the cutting blade touches the pilot hole D, it is automatically folded into the pilot hole D. (3) The tool 1 is advanced until the cutting blade 2 passes through the pilot hole D. (4) When the cutting blade 2 passes through the pilot hole D, it opens again by the action of centrifugal force. Thus, when the cutting blade 2 protrudes, the main shaft is switched to the normal rotation to lock the cutting blade 2, and this time, the counterbore D of a predetermined depth is applied to the prepared hole D while the tool 1 is retracted little by little. (5) When machining is completed, the tool 1 is moved forward, the cutting blade 2 is separated from the back surface of the workpiece W, and then the spindle is rotated in reverse. Thereby, the cutting blade 2 will be in an unlocked state. (6) A procedure is required in which the tool 1 is retracted while being reversed, and the cutting blade 2 is automatically folded and pulled out from the pilot hole D when passing through the pilot hole.
[0005]
In FIG. 13, the back surface chamfering process of the pilot hole D by the conventional automatic type chamfering apparatus is shown. In this case, the cutting blade 2 housed in the tip of the blade attachment 3 attached to the tool 1 so as to be able to protrude and retract is pushed outward by the spring force of a blade tool retracting mechanism (not shown). In this case, (1) the tool 1 is advanced and the cutting tool attachment 3 is passed through the pilot hole D. When the cutting blade 2 passes through the prepared hole D, the cutting blade 2 protruding outward from the cutting tool attachment 3 is pressed against the inner surface of the prepared hole and pushed into the cutting tool attachment 3 against the spring force. (2) The tool 1 is advanced until the cutting blade 2 passes through the pilot hole D. (3) When the cutting blade 2 passes through the pilot hole D, the cutting blade 2 is pushed outward again by the spring force. Therefore, the edge of the pilot hole D is chamfered at the inclined blade portion of the cutting blade 2 while the tool 1 is moved back little by little. (4) By continuing the retraction of the tool 1 as it is after the machining is finished, the cutting blade 2 is pressed against the inner diameter surface of the prepared hole and pushed into the cutting tool attachment 3 and pulled out through the prepared hole D.
[0006]
[Problems to be solved by the invention]
However, in the processing by the conventional pressing type automatic back facing processing apparatus shown in FIG. 11, when the surface Wa of the workpiece W pressing the end surface 1a of the tool 1 is not flat, in addition to the tool end surface 1a, As a result of the uneven load being applied and the rising height of the cutting edge 2 becoming inaccurate, there is a problem in that it is impossible to counter-bore the exact dimensions.
[0007]
Further, there is a problem that the surface Wa of the workpiece W may be damaged by pressing the end surface 1a of the tool 1.
Furthermore, there is a problem that a minimum workpiece depth H that can open (protrude) the cutting edge 2 by pressing the tool end surface 1a against the workpiece W is necessary and cannot be used in many cases.
[0008]
In the machining by the conventional reverse type automatic back facing machining apparatus shown in FIG. 12, the cutting blade 2 which is in an unlocked state (free state) when the main shaft is reversed projects due to the action of centrifugal force. If chips or the like at the previous machining bite, the cutting blade 2 may not protrude even if centrifugal force is applied, resulting in a malfunction. For this reason, there is a problem that there is anxiety in processing with completely unmanned operation.
[0009]
In the back surface chamfering by the conventional automatic chamfering apparatus shown in FIG. 13, the cutting blade 2 that has been projected by the spring force is forcibly pushed into the pilot hole D, and the workpiece is resisted against the spring force. There is a problem in that the workpiece W may be damaged when the cutting blade is inserted because it is passed while being pressed by the W itself.
[0010]
  Therefore, the present invention has been made to solve such a conventional problem. In the case of a recent machine tool, the cutting speed is increased and the processing accuracy is improved so that the tip of the tool can be improved. In view of the current situation in which the coolant liquid supply device in the tool that discharges the coolant liquid at a high pressure has been generally used, the back-facing and chamfering processing using the high pressure of the coolant liquid in the toolapparatusThe purpose is to provide.
[0011]
[Means for Solving the Problems]
  In order to achieve the above-mentioned object, the invention according to claim 1 is a tool that is attached to a machine tool so as to be axially rotatable.In addition, in the back face and chamfering processing apparatus provided with a blade that is driven to project in the radial direction, the tool is connected to a hydraulic cylinder using a coolant pressure supplied from a machine tool as a driving source, and the hydraulic cylinder. A cutting tool driving mechanism that is connected and moves in the axial direction to project the cutting tool in the radial direction, and communicates with the cutting tool from the pressurizing chamber of the hydraulic cylinder through the piston rod and the cutting tool driving mechanism, and is used for cooling the cutting tool. And a coolant supply passage for supplying a part of the liquid..
[0012]
  The invention according to claim 22. The counterbore / chamfering device according to claim 1, wherein the cutting tool comprises a cutting blade, and the cutting tool driving mechanism converts the linear rectilinear movement into a radial sliding movement or rotational movement of the cutting blade. It has a structure.
[0014]
  Claims3The invention according to claim 11In the back spot facing / chamfering device according to the invention, the cutting tool is composed of an elastic block body in which abrasive grains or cutting tips are embedded at least on the surface, and the cutting tool driving mechanism moves in the axial direction by the elastic block body. It is characterized by having a structure that bulges in the orthogonal direction by compressing in the axial direction.
[0015]
  Claims4The invention according to claim 11In the back spot and chamfering processing apparatus according to the invention, the cutting tool is formed of an elastic casing formed by assembling a plurality of metal wires or elongated metal plates in a cylindrical shape, and the cutting tool driving mechanism is moved in a straight line in the axial direction. It has the structure which pressurizes the end surface of an elastic housing and bulges a blade tool to radial direction.
[0016]
  Claims5The invention according to claim 11 relatedIn the counterbore and chamfering processing apparatus according to the invention, the blade has abrasive grains on the surface of a cylindrical elastic body that expands in the radial direction due to internal pressure, and the back surface side of the blade is communicated with the coolant supply path. It is characterized by that.
[0020]
  A counterbore / chamfering device according to the present invention is provided with a tool that is pivotally driven in a radial direction on a tool that is rotatably mounted on a machine tool, and a coolant liquid supplied from the machine tool to the tool. By applying the pressure, the cutting tool is protruded in the radial direction to perform counter-sinking and chamfering, and the coolant pressure is applied in the axial direction of the cutting tool. A hydraulic cylinder is used as the coolant hydraulic load means.1). The cutting tool is used as a cutting blade and a cutting tool driving mechanism is provided to allow the axial load to slide in the radial direction of the cutting blade, or to convert it into a rotating operation so that it can be countersunk and chamfered. (Claim)2). The timing of cutting edge protrusion can be set arbitrarily by adjusting the timing of coolant liquid supply, and therefore it is easy to set the timing when the cutting edge finishes passing through the pilot hole. The blade will be pulled in if the pressure of the coolant is released. In this way, the insertion and removal of the blade can be freely controlled regardless of the rotation or non-rotation of the tool, and machining such as back-facing and chamfering is facilitated.
[0021]
  Further, the cutting tool may be composed of an elastic block body having abrasive grains on its surface (claims)3), An elastic body in which a steel plate or steel wire is assembled in a substantially cylindrical shape (claims)4), By pressing and compressing the cutting tool in the axial direction using the pressure of the coolant liquid, it is possible to bulge in the radial direction and perform processing such as countersinking and chamfering, which simplifies the structure. .
[0022]
  Then, the blade is attached to the blade attachment as a cylindrical elastic body having abrasive grains on the surface.(Claim 5)If a coolant liquid is pressed into the back side of the blade, it expands in the radial direction due to the internal pressure, so that it is possible to carry out processing such as back-facing and chamfering. In this case, the structure is extremely simple.
[0023]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 to 3 show a first embodiment of a back spot / chamfering apparatus according to the present invention. FIG. 1 is a sectional view of an essential part thereof, FIG. 2 is a sectional view of an essential part in an operating state, FIG. 3 is an explanatory diagram of the procedure for counterbore machining. In the figure, reference numeral 1 denotes a tool that is detachably attached to a main shaft of an NC machine, which is a recent machine tool, via an arbor (not shown). The NC processing machine includes an in-tool coolant liquid supply device (not shown) that discharges a coolant liquid from the tip of the tool 1 at a high pressure. A piston chamber 11 of a spring return type single rod cylinder 10 as a hydraulic cylinder is provided at the tip of the tool 1, and the rear end of the piston chamber 11 is a coolant from the coolant liquid supply device in the tool. The pressurizing chamber 11 a is communicated with the liquid passage 12. A piston 13 is inserted into the piston chamber 11 via an O-ring seal 14. The piston 13 has a piston rod 15 on one side (an anti-pressurization chamber side), and a plurality of disc springs 16 are mounted as return elastic bodies, for example. On the head side of the piston chamber 11 that opens at the tip of the tool 1, a cylinder head 17 is hermetically fitted via an O-ring 18 and fixed with bolts. The piston rod 15 passes through a rod hole of the cylinder head 17 and protrudes outward through an O-ring 19 so as to be airtightly slidable.
[0024]
A cylindrical cutting tool attachment 20 with a single-side flange is attached to the upper surface of the cylinder head 17 by bolting the flange portion 20f. An axial through hole 21 is formed at the axial center of the cutting tool attachment 20, and a radial blade hole 20a through which the cutting blade 2 enters and exits is formed at the tip. A blade driving rod 22 constituting a drive mechanism for driving the cutting blade 2 as a blade to advance and retreat in the radial direction is inserted into the through hole 21 of the shaft center so as to be slidable in the axial direction.
[0025]
The leading end of the blade drive rod 22 has an inclined surface 22a and is bifurcated, and the cutting blade 2 is slidably sandwiched therebetween. Guide grooves 22b that are inclined along the inclined surface 22a are respectively formed on both side surfaces of the fork. A guide projection 2t that is fitted in the lower direction of the cutting blade 2 in the lateral direction is engaged with the inclined guide groove 22b. On the side surface of the cutting blade 2, an inclined step surface 2 a is formed that slides in contact with the inclined surface 22 a at the tip of the blade drive rod. That is, in this embodiment, the cutting blade 2 is moved in and out by the action of the groove cam and the inclined surface, which converts the straight forward and backward movement of the blade drive rod 22 into the movement in the orthogonal direction through the guide through hole (groove) 22b. It has become.
[0026]
On the other hand, a connecting projection 22c is provided at the rear end of the blade drive rod 22. The connecting projection 22c is inserted into the hole at the tip of the piston rod 15, and the set screw 24 inserted from the screw mounting hole 23 formed in the side surface of the blade attachment 20 is tightened to connect the piston rod 15 and the blade drive rod 22 to each other. They are connected together.
[0027]
Next, a processing procedure for performing back spot facing processing on the prepared hole of the workpiece W having a curved surface Wa using the tool 1 configured as described above will be described with reference to FIG.
(A) First, the tool 1 is not rotated, and the tip of the blade attachment 20 is inserted through the pilot hole D of the workpiece W in a state where the coolant is not pressed into the pressurizing chamber 11a (that is, the cutting blade 2 is retracted). .
[0028]
(B) When the portion of the cutting blade 2 at the tip of the cutting tool attachment 20 passes through the pilot hole D, the coolant liquid supply device in the tool is operated to supply high-pressure coolant liquid to the pressurizing chamber 11 a of the tool 1. . As a result, the piston 13 moves forward while compressing the disc spring 16 and pushes the blade drive rod 22 forward. When the inclined surface 22 a at the tip presses the inclined surface 2 a of the cutting blade 2, the pressed cutting blade 2 protrudes in the orthogonal direction and protrudes to the outer surface of the cutting tool attachment 20. Since the advancement distance of the blade attachment 20 is sufficient for the cutting blade 2 to pass through the pilot hole D of the workpiece W, a large depth space is not required on the back side of the workpiece as in the case of the conventional pressing type. There is no problem even if the workpiece surface Wa is a curved surface. Further, unlike the case of the conventional reversing type, since the high pressure of the coolant liquid is used, malfunction such as the cutting blade 2 not being pushed out hardly occurs. Moreover, since the cutting blade 2 is completely in non-contact with the workpiece while passing through the pilot hole D, the workpiece W is not damaged.
[0029]
(C) The tool 1 is rotated here, and back-facing is performed to a predetermined depth while moving back little by little.
(D) When the machining is completed, the rotation is stopped and the pressure of the coolant liquid in the pressurizing chamber 11a of the tool 1 is released. Then, the piston 13 is retracted by the action of the elastic restoring force of the disc spring 16 that has been compressed. As the cutting tool drive rod 22 is retracted, the guide protrusion 2t of the cutting tool is guided by the inclined guide groove 22b and moves in the orthogonal direction, and the cutting blade 2 is drawn into the cutting tool attachment 20. Therefore, the tool 1 is retracted and the cutting tool attachment 20 is pulled out from the prepared hole D. In this way, the back spot machining of the prepared hole D of the workpiece W can be performed efficiently.
[0030]
In addition, if the cutting edge 2 is changed from back-facing to chamfering, the edge on the back side of the pilot hole D can be chamfered by substantially the same operation.
FIG. 4 shows a second embodiment of the counterbore / chamfering apparatus of the present invention.
[0031]
In this case, the coolant liquid is supplied to the cutting edge 2 during the counterbore processing. That is, a coolant liquid supply path 25 that penetrates the shafts of the piston 13, piston rod 15, and blade drive rod 22 is provided, and a part of the coolant liquid supplied to the pressurizing chamber 11 a is cut through the coolant liquid supply path 25. 2 is supplied. A throttle may be provided in the coolant liquid supply path 25 so that the liquid pressure in the pressurizing chamber 11a does not decrease so much. If it does in this way, there exists an advantage which can prevent that the blade edge | tip of the cutting blade 2 wears out at the time of back-facing processing, or it welds and a face-facing surface deteriorates. Other configurations, operations, and effects are substantially the same as in the first embodiment.
[0032]
FIG. 5 shows a third embodiment of the counterbore / chamfering apparatus of the present invention.
This embodiment is different from the first embodiment shown in FIG. 1 to FIG. 3 in the structure of the hydraulic cylinder 10 and the access structure of the blade 2. That is, the hydraulic cylinder 10 is provided with a disc spring 16 on the rear end side of the piston chamber 11, and the cylinder head 17 side is a pressurizing chamber 11 a with respect to the front end side, that is, the piston 13. Then, in order to pump the coolant liquid to the pressurizing chamber 11a located on the front side of the piston, the liquid supply rod 41 having the liquid supply passage 40 in the shaft core portion and penetrating the piston 13 is used as the coolant liquid passage of the tool 1. 12 is provided at the base of the piston rod 15 with an empty chamber 42 through which the liquid supply rod 41 enters and exits and a liquid passage 43 that communicates from the empty chamber 42 to the pressurizing chamber 11a. An O-ring seal 44 prevents liquid leakage. On the other hand, a tiltable cutting blade 2 is attached to the tip of the blade attachment 20. The cutting blade 2 is sandwiched between two cutting tool drive rods 22 and is rotatably supported by a shaft 46. The cutting blade 2 is fixed to the cutting tool drive rod 22 in a groove 47 formed in the cutting blade 2 itself. The cutting blade drive pin 48 is engaged.
[0033]
FIG. 5A shows a state where the coolant liquid is not pumped into the piston pressurizing chamber 11 a at the tip of the tool 1, and the piston 13 is moved forward (rightward in the drawing) by the spring force of the disc spring 16. Extruded. Therefore, the blade drive rod 22 is also moved forward, and the cutting blade 2 is tilted and stored in the blade attachment 20. FIG. 5B shows a state in which the coolant liquid is pumped into the piston pressurizing chamber 11 a, and the piston 13 is pressed backward against the spring force of the disc spring 16. As a result, the blade driving rod 22 is retracted, and the cutting blade 2 pulled by the cutting blade driving pin 48 is turned up around the shaft 46 in the clockwise direction as shown in the figure and protrudes from the blade attachment 20.
[0034]
The procedure of back spot facing processing by the back spot and chamfering processing apparatus shown in FIG. 5 is the same as that described with reference to FIG. Further, the chamfering on the back side can be performed in the same manner by exchanging the cutting blade 2 from the countersinking for chamfering.
[0035]
6 to 8 show a fourth embodiment of the chamfering apparatus according to the present invention.
In this tool, a tool having a cylindrical structure as shown in FIG. 6 is used as a tool attachment attached to the tip of the tool 1 in a replaceable manner. That is, this cylindrical blade attachment 20A has a cutting tool protruding drive coolant liquid passage 26 at the center, and forms a cylindrical blade mounting recess 30 by cutting the tip part to a slightly smaller diameter. The trunk portion is further cut into a small diameter except for the front and rear portions 30 to provide an annular groove (pressurizing chamber) 31, and the pressurizing chamber 31 and the coolant liquid passage 26 are communicated with each other. A cylindrical blade 32 formed by molding a stretchable elastic material such as rubber in a cylindrical shape and fixing abrasive grains on the surface thereof is fitted into the blade mounting recess 30, and the front and rear end portions 33, 33 are bonded. It is fixed in a watertight manner with an agent. Thereafter, a retaining disc 34 is screwed to the distal end surface of the cutting tool mounting recess 30. The outer diameter of the cylindrical cutting tool 32 is matched with the outer diameter of the cutting tool attachment 20A, and the inner diameter is matched with the outer diameter of the cutting tool mounting recess 30. When not processed, the cylindrical cutting tool 32 is housed in the cutting tool mounting recess 30.
[0036]
The chamfering process on the back side of the prepared hole D of the workpiece W is performed as shown in FIG.
(A) With the cylindrical cutting tool 32 stored in the cutting tool mounting recess 30, the tip of the cutting tool attachment 20A is inserted into the pilot hole D, and the cylindrical cutting tool 32 is projected to the back side of the workpiece.
[0037]
(B) After that, the coolant liquid from the in-tool coolant liquid supply device (not shown) is sent into the pressurizing chamber 31 on the back side of the cylindrical blade 32 through the coolant protrusion driving coolant liquid passage 26, and the cylindrical blade 32 is moved. Inflate. Then, the cutting tool attachment 20A is slightly retracted, and the inclined surface to which the abrasive grains of the expanded cylindrical cutting tool 32 are attached is pressed against the rear edge of the pilot hole D and is chamfered to perform chamfering. If the hydraulic pressure is released after the processing is completed, the cylindrical cutting tool 32 contracts by its own elastic restoring force and is stored in the cutting tool mounting recess 30, so that the cutting tool attachment 20A can be easily pulled out from the pilot hole D. According to the chamfering apparatus of the third embodiment, in which the cylindrical cutting tool 32 is made of a stretchable elastic material, as shown in FIG. 8, the chamfering is performed at the intersecting portion when the two holes D and D ′ intersect. Processing can also be performed.
[0038]
FIG. 9 shows a fifth embodiment of the chamfering apparatus of the present invention.
FIG. 9A is a cross-sectional view showing the structure of the tip portion of the blade attachment 20B that is replaceably attached to the tip of the tool 1 having the hydraulic cylinder 10 as shown in FIG. 1, and FIG. 9B. Is a view taken along line bb. The cutting tool attachment 20B has a substantially U-shaped pusher 40 engaged with a cutting tool driving rod 22 that is a cutting tool driving mechanism penetrating the shaft center part attached to the tip of the cutting tool attachment 20B so as to advance and retreat in the axial direction. The pusher 40 fits in a split groove 41 formed at the tip of the blade drive rod 22 and is guided so as not to rotate. A female screw is formed at the tip of the blade drive rod 22, and a male screw 42 a of the guide bolt 42 is screwed into this. A thick cylindrical elastic block body 43 as a cutting tool and a metal color ring 44 are inserted into the body portion 42b of the guide bolt 42. The elastic block body 43 is a head of the metal color ring 44 and the guide bolt 42. 42c. The elastic block body 43 is made of, for example, synthetic rubber, and is formed by kneading abrasive grains, or has a cutting tip or abrasive grains fixed to the outer peripheral surface.
[0039]
When chamfering or countersinking is performed, the coolant is sent to the hydraulic cylinder 10 to move the blade drive rod 22 in the axial direction (forward in the drawing). Then, the pusher 40 moves forward and compresses the elastic block body 43 along the axis through the metal color ring 44. By this compression, the elastic block body 43 bulges in the radial direction as shown in FIG. 9C and the diameter is expanded, so that processing such as chamfering or back spotting can be performed. Note that the hydraulic cylinder 10 may be of the type shown in FIG. 5, that is, a cylinder in which the hydraulic pressure of the coolant is loaded on the piston rod side, in which case the blade drive rod 22 is engaged with the guide bolt 42, What is necessary is just to compress the elastic block body 43 with the tensile force of the blade drive rod 22. FIG.
[0040]
FIG. 10 shows a sixth embodiment of the chamfering apparatus of the present invention.
This embodiment is different in that an elastic casing 45 as shown in FIG. 10A is used as a cutting tool instead of the elastic block body 43 in the fifth embodiment (FIG. 9). The elastic housing 45 is formed by assembling a plurality of metal wires or elongated metal plates having elasticity such as a piano wire in a cylindrical shape between two end plates 47 and 47. When the end plates 47 of the elastic housing 45 are pressed in the axial direction by the blade drive rod 22 as described above, the elastic housing 45 is compressed in the axial direction as shown in FIG. Bulge in the radial direction. Thus, processing such as chamfering and back spot facing can be performed.
[0041]
【The invention's effect】
As described above, according to the present invention, the blade tool is operated using the pressure of the coolant liquid supplied from the machine tool, so that the operation timing of the blade tool can be freely controlled and operated with a strong force. As a result, the following various effects can be obtained.
[0042]
(1) The workpiece surface can be processed in a non-contact manner, and even if the workpiece surface is not flat, it can be accurately back-sinked without any problem, and the workpiece surface is not damaged at all.
[0043]
(2) Processing is possible without being restricted by the size of the depth space on the back side of the workpiece.
(3) There is no risk of operation failure due to cutting chips or the like being caught in the cutting tool, and the reliability is high even in completely unmanned operation.
[0044]
(4) When the cutting tool passes through the workpiece prepared hole, the cutting tool does not come into contact with the inner surface of the hole, and therefore the work is not damaged.
(5) Since the blade operation is performed only by the hydraulic pressure, the machining time can be shortened.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a main part of a first embodiment of a processing apparatus of the present invention.
FIG. 2 is a cross-sectional view of the main part of the cutting tool protruding operation state shown in FIG. 1;
FIG. 3 is an explanatory view of a back spot facing process for the one shown in FIG. 1;
FIG. 4 is a cross-sectional view of a main part of a second embodiment of the processing apparatus of the present invention.
FIGS. 5A and 5B are cross-sectional views of main parts of a third embodiment of the processing apparatus of the present invention, wherein FIG. 5A is when the blade is stored, and FIG. 5B is when the blade is protruding.
FIG. 6 is a cross-sectional view of a main part of a fourth embodiment of the processing apparatus of the present invention.
7 is an explanatory diagram of a chamfering process of the one shown in FIG. 6. FIG.
8 is a cross-sectional view showing an application example of the chamfering process shown in FIG.
9A and 9B show a chamfering apparatus according to a fifth embodiment of the present invention, in which FIG. 9A is a sectional view of a tip portion, FIG. 9B is a sectional view taken along line bb, and FIG. FIG.
FIGS. 10A and 10B show a sixth embodiment of the chamfering apparatus of the present invention, wherein FIG. 10A is a perspective view of a cutting tool, and FIG. 10B is a perspective view at the time of the machining operation.
FIG. 11 is an example of a conventional back spot facing processing apparatus.
FIG. 12 is another example of a conventional counterboring apparatus.
FIG. 13 is an example of a conventional chamfering apparatus.
[Explanation of symbols]
1 Tool
2 Cutting blade
10 Hydraulic cylinder
11 Piston chamber
11a Pressurization chamber
13 Piston
15 Piston rod
20 Cutting tool attachment
20A Cutting tool attachment
20B Cutting tool attachment
22 Cutting tool drive mechanism
25 Coolant liquid supply path
26 Coolant liquid passage for cutting tool drive
32 Cylindrical blade
43 Elastic block (blade)
45 Elastic body (blade)

Claims (5)

In a counterbore and chamfering processing device provided with a cutting tool driven to project in the radial direction on a tool that is rotatably mounted on a machine tool ,
The tool includes a hydraulic cylinder using a coolant pressure supplied from a machine tool as a drive source, a blade drive mechanism connected to the hydraulic cylinder and moving in the axial direction to project the blade in the radial direction, and the hydraulic pressure. A coolant supply passage that communicates with the blade from the pressure chamber of the cylinder through the piston rod and the blade drive mechanism and supplies a part of the coolant liquid for cooling the blade. Boring / chamfering equipment . 2. The back according to claim 1, wherein the cutting tool comprises a cutting blade, and the cutting tool driving mechanism has a cutting blade protrusion / retraction structure that converts a linearly advancing motion in an axial direction into a radial sliding motion or a rotating motion of the cutting blade. Counterbore / chamfering equipment. The cutting tool is composed of an elastic block body in which abrasive grains or cutting tips are embedded at least on the surface, and the cutting tool driving mechanism bulges in the orthogonal direction by compressing the elastic block body in the axial direction by a linear movement in the axial direction. The back spot facing / chamfering apparatus according to claim 1, wherein the apparatus has a structure. The cutting tool is composed of an elastic casing formed by assembling a plurality of metal wires or elongated metal plates into a cylindrical shape, and the cutting tool driving mechanism pressurizes the end face of the elastic casing in the axial direction to move the cutting tool in the radial direction. 2. The back spot facing / chamfering device according to claim 1, wherein the back spot facing / chamfering device has a bulging structure . 2. The back according to claim 1, wherein the blade has abrasive grains on the surface of a cylindrical elastic body that expands in the radial direction due to internal pressure, and the back side of the blade is communicated with the coolant supply path. Counterbore / chamfering equipment.

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