JP2009275619A - Processing device for micro recessed part - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a processing device for a micro-recess part capable of eliminating the influence of centrifugal force even if the offset amount of a form roller with respect to a tool holder or the rotation speed of the tool holder changes. <P>SOLUTION: The processing device forming the micro-recess part on an inner circumference surface Ba of a cylinder bore B includes the tool holder 10 rotatably driven, a roller support member 12 movable in a direction orthogonal to a rotary shaft L1 of the tool holder 10, the form roller 13 rotatable around a roller shaft L2 parallel with the rotary shaft L1 of the tool holder 10, a load generating means 14 imparting a load to the roller support member 12 and bringing the form roller 13 into pressure contact with the inner circumference surface Ba, a centrifugal force detection means 15 detecting centrifugal force generated by the rotation of the tool holder 10, and a balance weight 16 for adjusting a center of gravity based on the detected centrifugal force. When the tool holder 10 is rotatably driven, the influence of the centrifugal force is eliminated as much as possible. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention is, for example, a fine concave portion used to form a large number of fine concave portions functioning as an oil reservoir for realizing low friction on the inner peripheral surface of a cylinder bore (circular hole) in a cylinder block of an automobile engine. This relates to a processing apparatus.

  2. Description of the Related Art Conventionally, as a processing apparatus for fine recesses, there is an apparatus in which a rotationally driven tool holder is provided with a foam roller that is rotatable around a roller axis parallel to the rotation axis of the tool holder via a roller support member. In this processing apparatus, the foam roller is inserted into a circular hole of the workpiece, the center line of the circular hole is aligned with the rotation axis of the tool holder, and the foam roller is pressed against the inner peripheral surface of the circular hole with a predetermined load. Then, by rotating the tool holder, the foam roller rolls along the inner peripheral surface of the circular hole, and a fine recess is formed on the inner peripheral surface of the circular hole.

 By the way, in the processing apparatus as described above, since the roller shaft of the foam roller is offset from the rotation shaft of the tool holder, centrifugal force is generated in the roller support member and the foam roller by the rotation of the tool holder. This centrifugal force increases in proportion to the square of the rotational speed. For this reason, in order to perform processing with a low load, it is necessary to reduce the rotation of the tool holder, which is not preferable in terms of processing efficiency and processing cost.

Therefore, a conventional processing apparatus for fine recesses has a configuration in which a weight for adjusting the center of gravity is attached to a functional part including a roller support member and a foam roller in a tool holder so that the influence of centrifugal force can be canceled. (See Patent Document 1). By adopting a weight for adjusting the center of gravity, this processing device can perform processing with a low load even during high-speed rotation, thereby improving processing efficiency and reducing processing costs.
JP 2006-026676 A

  However, since the conventional processing apparatus for fine recesses as described above has a structure in which a weight having a predetermined weight is selectively attached to a predetermined position of the functional part, it depends on the offset amount of the foam roller with respect to the tool holder and the rotation speed of the tool holder. There is a problem that it is difficult to sufficiently cope with the changing centrifugal force, and it has been a problem to solve such a problem.

  The present invention has been made paying attention to the above-mentioned conventional problems, and even if the offset amount of the foam roller with respect to the tool holder and the rotation speed of the tool holder change, the influence of centrifugal force is eliminated as much as possible. It aims at providing the processing apparatus of the fine recessed part which can do.

  The processing apparatus of the fine recessed part of this invention is a processing apparatus which forms a fine recessed part in the internal peripheral surface of the circular hole of a to-be-processed object. A processing apparatus includes a tool holder that is arranged coaxially with a circular hole and is driven to rotate, a roller support member that is movable relative to the tool holder in a direction perpendicular to the rotation axis thereof, and a tool holder with respect to the roller support member There is provided a foam roller for forming a fine recess provided so as to be rotatable about a roller axis parallel to the rotation axis.

  Further, the processing device includes a load generating means for applying a load in the moving direction to the roller support member to press the foam roller against the inner peripheral surface of the circular hole, and a centrifugal force generated on the roller support member by the rotation of the tool holder. Centrifugal force detecting means for detecting force and a balance weight for adjusting the center of gravity of the roller support member based on the centrifugal force detected by the centrifugal force detecting means. The fine recess processing apparatus of the present invention has the above-described configuration as means for solving the conventional problems.

  In the above configuration, the foam roller is located at a position where the roller shaft is offset with respect to the rotation shaft of the tool holder. More preferably, the offset direction of the foam roller, the moving direction of the roller support member relative to the tool holder, and the load applying direction by the load generating means are the same.

  Further, according to the method of processing a fine recess according to the present invention, when forming the fine recess on the inner peripheral surface of the circular hole of the work piece, the centrifugal force generated on the roller support member is detected by rotating the tool holder before the processing. Based on the centrifugal force, the center of gravity of the roller support member is adjusted by the balance weight, and then the rotation axis of the tool holder and the center line of the circular hole are aligned, and the foam roller is pressed against the inner peripheral surface of the circular hole. The foam roller is rolled along the inner peripheral surface of the circular hole by rotationally driving the tool holder, and a fine recess is formed on the inner peripheral surface of the circular hole.

  According to the processing apparatus and processing method for fine recesses of the present invention, the influence of centrifugal force can be eliminated as much as possible even if the offset amount of the foam roller with respect to the tool holder and the rotation speed of the tool holder change. Thereby, it can contribute to the high precision of a fine recessed part, the improvement of processing efficiency, and the reduction of processing cost.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, this invention is not limited to the following embodiment.

  A processing apparatus 1 for fine recesses shown in FIG. 2 is an NC machine tool that uses a cylinder block of an automobile engine as a workpiece and forms fine recesses on an inner peripheral surface Ba of a cylinder bore B that is a circular hole. The processing apparatus 1 includes a spindle head 2 that is movable in the vertical direction, a spindle 3 that is supported by the spindle head 2 so as to protrude downward, and biaxial directions that are orthogonal to each other in a horizontal plane below the spindle head 2. A movable workpiece placing table 4 and a tool holder 10 mounted coaxially on the main shaft 3 and driven to rotate integrally are provided.

  In this embodiment, the spindle head 2 that can be raised and lowered constitutes an axial movement means that relatively moves the cylinder block (workpiece) and the tool holder 10 in the direction along the center line L3 of the cylinder bore (circular hole) B. is doing. The spindle head 2 may be configured to be movable in two axial directions orthogonal to each other in the horizontal plane, like the table 4.

  As shown in FIG. 1, the tool holder 10 has a shank portion 10A that is a portion to be attached to the main shaft 3, and a body portion 10B that is continuous below the shank portion 10A. 10C.

  The tool holder 10 is integrally provided with a housing 11 below the adapter 10C, and moves in the horizontal direction (left and right direction in FIG. 1a) perpendicular to the rotation axis L1 of the tool holder 10. A possible roller support member 12 is provided. The roller support member 12 is provided with a foam roller 13 for forming a fine recess that is rotatable around a roller axis L2 parallel to the rotation axis L1 of the tool holder 10. Here, the roller axis L2 of the foam roller 13 is in a position offset in the same direction as the movement direction of the roller support member 12 (rightward in FIG. 1a) with respect to the rotation axis L1 of the tool holder 10. .

  Further, the tool holder 10 applies a load in the moving direction to the roller support member 12 to press the foam roller 13 against the inner peripheral surface Ba of the cylinder bore B, and the tool holder 10 rotates. Centrifugal force detecting means 15 for detecting centrifugal force generated in the roller support member 12 and a balance weight 16 for adjusting the center of gravity of the roller support member 12 based on the centrifugal force detected by the centrifugal force detecting means 15 are provided. . For example, a piezoelectric load cell can be used as the centrifugal force detection means 15, which enables highly accurate centrifugal force detection with a simple configuration.

  The adapter 10C includes a frame 17 to which the housing 11 is fixed, a guide bar 29 that guides the frame 17, an actuator (hydraulic cylinder) 18 that advances the frame 17 rightward in FIG. A return spring 19 and the like for retracting the actuator 18 along with the discharge of the actuator 18 are provided. This adapter 10 </ b> C constitutes a radial direction moving means for reciprocating (back and forth) the housing 11 in the same direction as the moving direction of the roller support member 12. The radial direction is the radial direction of the cylinder bore B, the foam roller 13, and the like.

  The housing 11 holds the roller support member 12 so as to be movable in the horizontal direction. The housing 11 is a hollow member that is opened downward. One side is the left side in FIG. 1a and the other side is the other side. On the side, cylindrical portions 11a and 11b having a horizontal axis are coaxially formed.

  The roller support member 12 is a substantially cylindrical member whose axis is vertical, and its upper end is guided in the horizontal direction by a plurality of cross roller guides 20 provided in the housing 11, and is orthogonal to the rotation axis L 1 of the tool holder 10. It is possible to move in the direction. A foam roller 13 is rotatably mounted on the lower end portion of the roller support member 12 via a vertical support shaft 21 including a combined angular ball bearing. The center of the support shaft 21 is the roller shaft L2.

  The foam roller 13 has a diameter smaller than the diameter of the cylinder bore B and has fine convex portions for forming fine concave portions on the outer peripheral portion. This foam roller 13 is provided with protruding fine convex portions that form dimple-shaped fine concave portions at a predetermined interval, or provided with saddle-shaped fine convex portions that continuously form groove-shaped fine concave portions. It can be.

  The material of the foam roller 13 is not particularly limited. For example, the foam roller 13 is made of carbide, a hard metal other than carbide, ceramics such as alumina and silicon nitride, and has high strength and toughness. Even if the workpiece is a high-hardness material such as hardened steel, fine recesses can be formed.

  The load generating means 14 is a compression coil spring interposed between the roller seat 12 and a spring seat 22 having an end inserted into the cylindrical portion 11 a on one side of the housing 11. The load generating means 14 applies the load in the horizontal direction to the roller support member 12 in a state in which the rotation axis L1 of the tool holder 10 and the center line L3 of the cylinder bore B coincide with each other. The cylinder bore B is brought into pressure contact with the inner peripheral surface Ba.

  In the housing 11, a pressure receiving member 23 is screwed to the end of the cylindrical portion 11 a on one side, and the load generating means 14, that is, a compression coil spring is interposed between the pressure receiving member 23 and the spring seat 22. Load detecting means 24 for detecting the generated load is provided. For example, a piezoelectric load cell can be used as the load detection means 24. This enables highly accurate load detection with a simple configuration.

  Further, in the housing 11, an adjustment screw 25 is screwed to the end of the other cylindrical portion 11 b, and a centrifugal force is detected between the adjustment screw 25 and a stopper 26 fixed to the roller support member 12. Means 15 are movably accommodated. That is, by operating the adjustment screw 26, the position of the centrifugal force detecting means 15 can be freely adjusted.

  Further, a plurality of holding rods 27 whose axis is in the horizontal direction are fixed to the roller support member 12, and a balance weight 16 is attached to each holding rod 27 so that the position can be adjusted in the axial direction. It is.

  Here, the tool holder 10 arrange | positions the load detection means 24, the load generation means (compression coil spring) 14, and the centrifugal force detection means 15 on the coaxial line. At this time, in the tool holder 10, as described above, the roller axis L 2 of the foam roller 13 is offset with respect to the rotation axis L 1 of the tool holder 10, and on the offset side (right side in FIG. 1 a) The force detection means 15 is arranged, and the load detection means 24 and the balance weight 16 are arranged on the non-offset side (left side in FIG. 1a).

  Further, in this embodiment, the adjustment screw 25 constitutes a detection position adjustment unit that reciprocates the centrifugal force detection unit 15 in the same direction as the moving direction of the roller support member 12. Further, in this embodiment, the balance weight 16 and the holding rod 27 constitute a center-of-gravity position adjusting unit that reciprocates the balance weight 16 in the same direction as the moving direction of the roller support member 12. That is, the detection position adjusting means and the gravity center position adjusting means of this embodiment perform the adjustment operation manually.

  Further, when load cells are used for the centrifugal force detection means 15 and the load detection means 24, detection signals from these means are output to a control device (not shown) via a transmitter 28 provided in the housing 11.

  Next, together with the operation of the fine recess processing apparatus 1 having the above-described configuration, a method for processing the fine recess will be described.

  Prior to processing, the processing apparatus 1 introduces hydraulic oil into the actuator 18 of the adapter 10 </ b> C to advance the housing 11, the roller support member 12, and the foam roller 13 integrally. At this time, the roller support member 12 is in the forward limit position where the gap S shown in FIG. 1A becomes zero by the action of the load generating means 14 regardless of the operation of the actuator 18.

  The offset amount of the roller shaft L2 of the foam roller 13 with respect to the rotation axis L1 of the tool holder 10 is based on the condition that the rotation axis L1 of the tool holder 10 and the center line L3 of the cylinder bore B coincide with each other. It is set in advance according to the inner diameter and the pressure contact load of the foam roller 13. Therefore, the offset amount at the time of adjusting the center of gravity is larger than that in the state shown in FIG. 1A, and further increases when the housing 11 is advanced by the actuator 18 as described above.

  Next, the centrifugal force detection means 15 is moved by operating the adjustment screw 25. That is, by operating the adjusting screw 25, the centrifugal force detecting means 15 is pushed and brought into contact with the stopper 26, and the roller support member 12 is pushed back until the offset amount becomes a set value at the time of processing. As a result, a gap S is generated as shown in FIG.

  At this time, the centrifugal force detecting means 15 and the load detecting means 24 are subjected to the repulsive force of the load generating means 14 located in the coaxial state therebetween, so that the initial load F0 detected by the centrifugal force detecting means 15 and the load detecting means 24 are detected. The initial load F1 detected in (1) is equivalent (F0 = F1).

  Next, in the said processing apparatus 1, the tool holder 10 is rotationally driven with the same rotational speed as the time of a process in the said state, and the load detected by the centrifugal force detection means 15 is made into the centrifugal force F2. At this time, the load generating means 14 and the spring seat 22 are adjusted so as not to be affected by centrifugal force.

  In the processing apparatus 1, when the centrifugal force F <b> 2 is larger than the initial load F <b> 0 detected by the centrifugal force detection means 15 (F <b> 2> F <b> 0), the centrifugal force acting on the roller support member 12 is on the offset side of the foam roller 13. Since it occurs on the right side in FIG. 1a, the balance weight 16 is moved to the counter-offset side (left side in FIG. 1a) of the foam roller 13 so that the centrifugal force acting on the roller support member 12 is reduced.

  Further, when the centrifugal force F2 is smaller than the initial load F0 detected by the centrifugal force detecting means 15 (F2 <F0), the centrifugal force acting on the roller support member 12 is opposite to the offset side of the foam roller 13 (in FIG. 1a). Therefore, the balance weight 16 is moved to the offset side (right side in FIG. 1a) of the foam roller 13 so that the centrifugal force acting on the roller support member 12 is reduced.

  Since the initial load F0 of the centrifugal force detection means 15 and the initial load F1 of the load detection means 24 are equal, the initial load F1 of the load detection means 24 and the centrifugal force F2 may be compared in the gravity center adjustment. . Then, the center-of-gravity adjustment is finished in a state where the initial loads F0, F1 and the centrifugal force F2 are equal (F0 = F1 = F2). If the influence of a slight centrifugal force can be tolerated, the gravity center adjustment may be terminated in a state including a tolerance (F0≈F1≈F2).

  After the center of gravity adjustment is completed as described above, the hydraulic oil is discharged from the actuator 18 of the adapter 10 </ b> C, and the housing 11, the roller support member 12, and the foam roller 13 are integrally retracted by the action of the return spring 19. Further, the adjusting screw 25 is reversely rotated to separate the centrifugal force detecting means 15 and the stopper 26 and return the roller support member 12 to the forward limit before the center of gravity adjustment.

  After that, the machining apparatus 1 rotates the tool holder 10 with the main shaft 3 in a state where the rotation axis L1 of the tool holder 10 and the center line L3 of the cylinder bore B are matched. Then, when the foam roller 13 is lowered to a predetermined position in the cylinder bore B by the spindle head 2, the housing 11, the roller support member 12, and the foam roller 13 are integrally advanced by the actuator 18 of the adapter 10C.

  In the forward movement process of the foam roller 13, after the roller 13 comes into contact with the inner peripheral surface Ba of the cylinder bore B, the load generating means (compression coil spring) 14 is compressed, and the generated load is detected by the load detecting means 24. ing. Therefore, the forward movement of the foam roller 13 is stopped when the detected load of the load detecting means 24 reaches a predetermined value. As a result, the offset amount of the roller shaft L2 of the foam roller 13 with respect to the rotation shaft L1 of the tool holder 10 becomes a preset value at the time of processing. The tool holder 10 may be driven to rotate after the foam roller 13 is brought into pressure contact with the inner peripheral surface Ba of the cylinder bore B.

  Thereafter, the processing apparatus 1 continues to rotate the tool holder 10 to cause the foam roller 13 to roll along the inner peripheral surface Ba of the cylinder bore B, and further lowers the tool holder 10 at a low speed by the spindle head 2. By doing so, fine concave portions are formed in a wide range along the spiral around the center line L3 with respect to the inner peripheral surface Ba of the cylinder bore B. Further, after forming the fine recess in the necessary range, the foam roller 13 is moved backward by the adapter 10 </ b> C, and the foam roller 13 is raised to the outside of the cylinder bore B by the spindle head 2.

  As described above, according to the processing apparatus 1 and the processing method for fine recesses described above, the centrifugal force generated in the roller support member 12 is detected by the centrifugal force detection means 15 before the processing, and the balance weight is determined based on the centrifugal force. Since the center of gravity of the roller support member 12 is adjusted by 16, the influence of the centrifugal force at the time of processing can be zero or as close to zero as possible.

  In addition, according to the processing apparatus 1 and the processing method for fine recesses described above, since there is almost no influence of centrifugal force during processing, the pressure contact of the foam roller 13 during the period from the start of rotation of the tool holder 10 to a predetermined rotational speed. The load does not change, and a highly accurate fine recess can be formed from the initial stage of processing.

  Furthermore, according to the processing apparatus 1 and processing method for fine recesses described above, since there is almost no influence of centrifugal force during processing, the pressure contact load of the foam roller 13 can be kept small even when the tool holder 10 is rotated at a high speed. . Thereby, the further shortening of processing time and the lifetime improvement of the foam roller 13 are also realizable.

  And even if the offset amount of the foam roller 13 with respect to the tool holder 10 or the rotational speed of the tool holder 10 changes, the processing device 1 for fine recesses described above can influence the centrifugal force by detecting the centrifugal force and adjusting the center of gravity. It can be resolved as much as possible. Thereby, it can contribute to the high precision of a fine recessed part, the improvement of processing efficiency, and the reduction of processing cost.

  Moreover, in the processing apparatus 1 and the processing method of the said embodiment, while processing, the tool holder 10 is rotationally driven, and the workpiece (cylinder block) and the tool holder 10 are moved to the center line L3 of the circular hole (cylinder bore B). Since the tool holder 10 is moved relative to the direction along which it moves, specifically, the concave portion can be continuously formed over a wide range with respect to the inner peripheral surface Ba of the cylinder bore B. Improvement has been realized.

  Furthermore, in the processing apparatus 1 according to the above-described embodiment, the tool holder 10 has the housing 11 that holds the roller support member 12 movably, and the radial movement that reciprocates the housing 11 in the same direction as the movement direction of the roller support member 12. Since the means (adapter 10C) is provided, a large amount of advancement of the roller support member 12 can be secured, and a plurality of types of cylinder bores B having different inner diameters can be easily dealt with.

  At this time, for example, when the inner diameter of the cylinder bore B is D and the outer diameter of the foam roller 13 is d, the offset amount of the roller shaft L2 of the foam roller 13 with respect to the rotation shaft L1 of the tool holder 10 is (D−d) / 2. The position may be adjusted so that

  If the radial movement means (adapter 10C) is provided, the foam roller 13 is moved into the cylinder bore B while the tool holder 10 is rotated, and then the foam roller 13 is moved to the inner circumference of the cylinder bore B. Since it can be press-contacted to the surface Ba, the processing time can be further shortened.

  Furthermore, in the processing apparatus 1 of the above embodiment, by adopting a compression coil spring as the load generating means 14, there is no need for piping and wiring such as hydraulic pressure, pneumatic pressure, and electricity, and a sufficient generated load can be obtained with a simple configuration. be able to.

  Furthermore, in the processing apparatus 1 of the above-described embodiment, the load detection means, the load generation means, and the centrifugal force detection means are arranged on the coaxial line, thereby realizing downsizing and simplification of the apparatus structure and detecting the centrifugal force. Can be accurately and easily performed.

  Furthermore, in the processing apparatus 1 of the above embodiment, the balance weight 16 and the holding rod 27 that are manually operated are employed as the gravity center position adjusting means for reciprocating the balance weight 16 in the same direction as the movement direction of the roller support member 12. Therefore, simplification or the like of the device structure can be realized.

  Furthermore, in the processing apparatus 1 of the above embodiment, the adjustment screw 25 that is manually operated is employed as the detection position adjustment means that reciprocates the centrifugal force detection means 15 in the same direction as the movement direction of the roller support member 12. Further, simplification and the like of the device structure can be realized.

  FIG. 3 is a view for explaining another embodiment of the processing apparatus for fine recesses of the present invention. Note that the same components as those of the previous embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  In the illustrated processing apparatus, the spindle head 2 indicated by a virtual line is movable in the horizontal direction, particularly in the offset direction of the foam roller 13 (left and right in FIG. 3), and has a spindle fixed position stop function, When the rotation of the main shaft 3 is stopped, the offset position of the roller support member 12 is positioned on the right side of the rotation axis L1 of the tool holder 10 as shown in FIG. The tool holder 10 includes a shank portion 10A and a body portion 10B, and an adapter 10D that does not include the actuator or the like described in the previous embodiment.

  The processing apparatus of this embodiment detects the centrifugal force generated in the roller support member 12 in the same manner as the previous embodiment, adjusts the center of gravity of the roller support member 12 based on the detected value, and forms the foam roller 13 and the cylinder bore B. After the spindle head 2 is moved to the offset side (left side in FIG. 3) of the roller support member 12 to a position where it does not interfere with the inner peripheral surface Ba, the foam roller 13 is lowered to a predetermined position in the cylinder bore B. The tool holder 10 is moved by the spindle head 2 so that the rotation axis L1 of the tool holder 10 and the center line L3 of the cylinder bore B coincide with each other, and the foam roller 13 is pressed against the inner peripheral surface Ba of the cylinder bore B. At this time, the setting of the pressure contact load is the same as in the previous embodiment.

  Thereafter, as in the previous embodiment, the machining apparatus rotationally drives the tool holder 10 to roll the foam roller 13 along the inner peripheral surface Ba of the cylinder bore B, and the spindle head 2 moves the tool holder 10 at a low speed. As a result, the fine recesses are continuously formed along the spiral around the center line L3 with respect to the inner peripheral surface Ba of the cylinder bore B. Note that the cylinder block may be rotated around the center line L3 of the cylinder bore B by the table 4 at the same time as the tool holder 10 is rotationally driven.

  FIG. 4 is a view for explaining still another embodiment of the fine recess processing apparatus of the present invention. Note that the same components as those of the previous embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  In the illustrated processing apparatus, in the tool holder 10, each of the radial direction moving means, the center-of-gravity position adjusting means, and the detection position adjusting means includes one of an actuator that is driven to extend and contract and a motor that is driven to rotate as a drive source. It has become.

  That is, the radial direction moving means is means for reciprocating the housing 11 in the same direction as the moving direction of the roller support member 12. Specifically, the actuator (hydraulic cylinder) 18 or the like that is driven to extend and contract is used as a drive source. Adapter 10C.

  The center-of-gravity position adjusting means is means for reciprocating the balance weight 16 in the same direction as the movement direction of the roller support member 12, and specifically, the balance weight 16 and a holding rod on which the balance weight 16 is movably mounted. 27 and a drive mechanism 31. The drive mechanism 31 includes a drive source that is an actuator or a motor, and a power transmission unit that transmits the drive force to the balance weight 16 or the holding rod 27.

  The detection position adjustment means is means for reciprocating the centrifugal force detection means 15 in the same direction as the movement direction of the roller support member 12. Specifically, the detection position adjustment means is an adjustment screw 25 and a drive mechanism 32. The drive mechanism 32 includes a drive source that is an actuator or a motor, and a power transmission unit that transmits the drive force to the adjustment screw 25.

  And the processing apparatus of this embodiment is based on the detection signal from the load detection means 24 and the centrifugal force detection means 15, radial direction movement means (adapter 10C), gravity center position adjustment means (balance weight 16, holding rod 27 and An automatic control means 33 for controlling the drive mechanism 31) and the detection position adjustment means (the adjustment screw 25 and the drive mechanism 32) is provided.

  The detection signals from the load detection means 24 and the centrifugal force detection means 15 are input to the automatic control means 33 via the transmitter 28 as in the previous embodiment. Moreover, since each drive mechanism 31 and 32 will rotate with the tool holder 10, all are as small and lightweight as possible.

  In the processing apparatus having the above configuration, after the foam roller 13 is advanced by the adapter 10C, the drive mechanism 32 refers to the centrifugal force detection means 15 while referring to the detection signals from the centrifugal force detection means 15 and the load detection means 24. Is moved by a predetermined amount, and the tool holder 10 is rotationally driven in this state to detect the centrifugal force. Then, based on the detected centrifugal force, the driving mechanism 31 moves the balance weight 16 so as to reduce the centrifugal force, thereby adjusting the center of gravity. Thereafter, the processing apparatus shifts to a processing step for fine recesses.

  That is, the processing apparatus of this embodiment processes the fine recesses after performing centrifugal force detection and center-of-gravity adjustment, as in the previous embodiment, but the automatic control means 33 uses the radial movement means ( The operations of the adapter 10C), the gravity center position adjusting means (balance weight 16, holding rod 27 and drive mechanism 31) and detection position adjusting means (adjustment screw 25 and drive mechanism 32) are automatically controlled.

  The above processing apparatus can obtain the same effects as those of the previous embodiment, and can realize full automation of the processing of the fine recesses, thereby contributing to further higher efficiency and cost reduction.

  Note that the fine recess processing apparatus of the present invention is not limited to the above-described embodiments, and the configuration of each means and the like can be changed without departing from the gist of the present invention. is there.

  In the above embodiment, the case where the workpiece is a cylinder block having the cylinder bore B which is a circular hole is exemplified. However, the processing apparatus for fine recesses of the present invention includes a compressor having a cylinder bore which is a circular hole, For various sliding members having a sliding hole that is a circular hole, such as a plain bearing having a shaft hole that is a circular hole, especially for various sliding members that constitute automobile parts, This is extremely useful for forming fine concave portions on the peripheral surface.

  And various sliding members, such as the above-mentioned cylinder block, a compressor, and a slide bearing, have a fine concave part with high accuracy in the inner peripheral surface of a circular hole by forming a fine concave part using the processing device of the present invention. In particular, sliding members constituting automobile parts can realize further reduction of friction and improvement of engine performance.

It is sectional drawing (a) and side view (b) explaining one Embodiment of the fine recessed part processing apparatus of this invention. It is a perspective view which shows the whole processing apparatus of a fine recessed part. Sectional drawing explaining other embodiment of the fine recessed part processing apparatus of this invention. Sectional drawing explaining further another embodiment of the fine recessed part processing apparatus of this invention.

Explanation of symbols

B Cylinder bore (circular hole)
Ba Inner circumferential surface L1 Tool holder rotation axis L2 Roller shaft L3 Cylinder bore center line 1 Processing device 2 Spindle head (axial movement means)
10 Tool holder 10C Adapter (radial direction moving means)
DESCRIPTION OF SYMBOLS 11 Housing 12 Roller support member 13 Foam roller 14 Load generation means 15 Centrifugal force detection means 16 Balance weight (gravity center position adjustment means)
24 Load detection means 25 Adjustment screw (detection position adjustment means)
27 Holding rod (center of gravity position adjustment means)
31 Drive mechanism of center-of-gravity position adjustment means 32 Drive mechanism of detection position adjustment means 33 Automatic control means

Claims (16)

A processing device for forming fine recesses on the inner peripheral surface of a circular hole of a workpiece,
A tool holder which is arranged coaxially with the circular hole and is driven to rotate;
A roller support member movable relative to the tool holder in a direction perpendicular to the rotation axis thereof;
A foam roller for forming a fine recess provided to be rotatable about a roller axis parallel to the rotation axis of the tool holder with respect to the roller support member;
A load generating means for applying a load in the moving direction to the roller support member to press the foam roller against the inner peripheral surface of the circular hole;
Centrifugal force detection means for detecting centrifugal force generated in the roller support member by rotation of the tool holder;
A processing apparatus for fine recesses, comprising a balance weight for adjusting the center of gravity of the roller support member based on the centrifugal force detected by the centrifugal force detection means.   2. The processing apparatus for fine recesses according to claim 1, further comprising axial movement means for relatively moving the work piece and the tool holder in a direction along the center line of the circular hole.   The tool holder is provided with a housing for movably holding the roller support member, and radial movement means for reciprocating the housing in the same direction as the movement direction of the roller support member. Processing equipment for fine recesses.   The apparatus for processing a fine recess according to any one of claims 1 to 3, wherein the load generating means is a compression coil spring.   The apparatus for processing a fine recess according to any one of claims 1 to 4, further comprising load detection means for detecting a load generated by the load generation means.   6. The fine recess processing apparatus according to claim 5, wherein the load detecting means, the load generating means, and the centrifugal force detecting means are arranged on a coaxial line.   The apparatus for processing a fine recess according to claim 5 or 6, wherein at least one of the load detection means and the centrifugal force detection means is a load cell.   The apparatus for processing a fine recess according to any one of claims 1 to 7, further comprising a gravity center position adjusting means for reciprocating the balance weight in the same direction as the moving direction of the roller support member.   The apparatus for processing a fine recess according to any one of claims 1 to 8, further comprising detection position adjusting means for reciprocating the centrifugal force detecting means in the same direction as the moving direction of the roller support member.   Each of the radial direction moving means, the gravity center position adjusting means, and the detection position adjusting means includes either one of an actuator that is driven to expand and contract and a motor that is driven to rotate as a drive source, and detection from the load detection means and the centrifugal force detection means. The apparatus for processing a fine recess according to any one of claims 3 to 9, further comprising automatic control means for controlling the radial direction moving means, the center-of-gravity position adjusting means, and the detected position adjusting means based on the signal. .   When forming a fine recessed part in the internal peripheral surface of the circular hole of a to-be-processed object using the processing apparatus of the fine recessed part of any one of Claims 1-10, a tool holder is rotated before a process. The centrifugal force generated in the roller support member is detected, the center of gravity of the roller support member is adjusted by the balance weight based on the centrifugal force, and then the rotation axis of the tool holder and the center line of the circular hole are made to coincide with each other. The roller is brought into pressure contact with the inner peripheral surface of the circular hole, and the tool holder is rotated to roll the foam roller along the inner peripheral surface of the circular hole, thereby forming a fine recess on the inner peripheral surface of the circular hole. A processing method of a fine recess.   The method for processing a fine recess according to claim 11, wherein the tool holder is rotationally driven and the workpiece and the tool holder are relatively moved in a direction along the center line of the circular hole.   The workpiece is a sliding member having a sliding hole which is a circular hole, and the inner peripheral surface of the sliding hole using the fine recess processing apparatus according to any one of claims 1 to 10. A sliding member characterized in that a fine recess is formed on the surface.   A work piece is a cylinder block having a cylinder bore which is a circular hole, and the fine concave portion is formed on the inner peripheral surface of the cylinder bore using the fine concave portion processing apparatus according to any one of claims 1 to 10. Cylinder block characterized by that.   The workpiece is a compressor having a cylinder bore that is a circular hole, and the fine concave portion is formed on the inner peripheral surface of the cylinder bore using the fine concave portion processing apparatus according to any one of claims 1 to 10. Compressor characterized by that.   A work piece is a slide bearing having a shaft hole which is a circular hole, and the fine concave portion is formed on the inner peripheral surface of the shaft hole by using the fine concave portion processing apparatus according to any one of claims 1 to 10. A plain bearing characterized by the formation of

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