JPH0626786B2 - Grinding method and device for cylindrical outer surface flaw - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for automatically detecting and grinding an outer surface flaw mark of a cylinder such as a circular pipe or a rod having a circular cross section.

(Prior Art) Conventionally, as a method and an apparatus for automatically grinding a flaw on the outer surface of a cylinder, a marking material is applied to the flaw in advance, and the marking material is applied to the cylinder, as shown in FIGS. X-
The marking material application portion is detected by, for example, a reflection type photoelectric switch while being supported by inclined arrangement rolls 2a and 2b arranged at the same intersecting angle with respect to the axis on both sides of X and being rotated and moved forward. Thus, the grinding member 3 such as a grinding wheel or a grinding belt arranged so as to be orthogonal to the axis line XX of the support of the column 1 is lowered,
As shown in FIG. 9, a technique of abutting against the cylinder 1 and performing grinding while at least one rotation of the cylinder 1 to remove the flaw,
Grinding members 5a arranged so as to sandwich the cylinder while pinching the cylinder 1 by the pinch rolls 4a and 4b of the shape which are forcibly rotated in the directions Z1 and Z2 opposite to each other and advancing in the direction of the arrow Y, A technique is known in which 5b are revolved around a cylinder 1 as indicated by an arrow W in FIG. 10, and the outer peripheral surface of the cylinder 1 is ground over the entire length of the cylinder.
In FIGS. 9 and 10, 6a and 6b are support rolls.

As described above, in the automatic grinding of the outer surface of the cylinder, conventionally, the entire circumference of the cylinder including at least the flawed portion is ground, and in order to grind and remove only the flawed portion, hold the hand grinder manually. The reality is that only the marking material application area is ground.

(Problems to be Solved by the Invention) As described above, in the conventional automatic grinding of the outer surface flaw of the cylinder, the diameter of the cylinder may become smaller than the reference dimension because the cylinder is ground so as to make one round in the circumferential direction. However, there is a problem that it becomes an ineligible product. Further, when grinding with a hand grinder, there is a problem that a worker is ill due to vibration of the grinder.

The present invention solves the above problems, and is capable of grinding only a flaw portion on the outer surface of a cylinder and the vicinity thereof, and a grinding method capable of grinding so as not to generate a step at the boundary between the ground portion and the non-ground portion. It is intended to provide a device.

(Means for Solving the Problem) In order to achieve the above object, the present invention applies a marking material to a flaw portion on the outer surface of a cylinder, and while advancing in the axial direction of the cylinder while rotating the cylinder, In addition to detecting the marking material application point by inspecting the outer surface of the cylinder with a visual field of a predetermined width corresponding to the rotation speed and the forward speed,
Measure the distance from the cylinder end to the detected marking material application point and the number of rotations from the rotation start position, perform arithmetic processing based on this measurement value, and then retract the cylinder,
At the time of this retreat, by the operation command based on the arithmetic processing,
The grinding member, which makes a small reciprocating linear motion in the axial direction of the cylinder, is strongly abutted at the marking material application point of the cylinder that makes a small reciprocating rotary motion around the cylinder axis, and the cylinder axis The method is to grind by weakly abutting in the vicinity of the marking material application point in the direction, and these methods are used as a device to implement a cylinder located at one end of the base and reciprocally movable on the base. A holding portion, a grinding portion provided on the other end side of the base, a detection portion which is provided on the holding portion side with respect to the grinding portion, and which detects a marking material application portion of a cylinder, and a cylinder end detector. The columnar holding portion includes a substrate mounted on a base so as to be reciprocally movable, a clamp base body vertically movable within a gate-shaped frame portion fixed on the base plate, and the clamp base body. That is rotatably attached to the substrate A motor for rotating the ramp shoe, a rotary pulse generator installed on the motor, a mechanism for reciprocally rotating the clamp shoe in a small width, a gear engaged with the rack provided on the base, and a columnar holder for driving the gear. And a pulse generator for the motor. The grinding unit includes a reciprocating table mounted on a fixed bar horizontally provided on the base, and a vertical moving unit on the reciprocating table. A support portion for the grinding member provided freely, a drive motor for the grinding member,
As a mechanism for reciprocating the lifting cylinder of the support portion and the reciprocating table, a large gear that is driven, a connecting rod that connects the large gear and the reciprocating table, and the number of teeth that mesh with the large gear It has a pressure booster operated via a small gear having a ratio of 1/2, and a circuit connecting the pressure booster and the lifting cylinder, and the cylinder end detector, the detector, the rotary pulse generator,
A signal processing unit to which a signal from a pulse generator for a cylinder holding unit drive motor is input, an arithmetic processing unit to which a signal from this signal processing unit and the signals from both of the pulse generators are input and which is operated. An apparatus provided with a control command unit for inputting the result of this arithmetic processing and outputting a command to each of a clamp shoe rotation drive motor, a cylinder holding unit drive motor, a grinding member drive motor, and a grinding member support unit lifting cylinder. I will provide a.

(Operation) Since the method for grinding a cylindrical outer surface flaw according to the present invention comprises the above-mentioned steps, only the marking material application portion and its vicinity can be automatically ground when the cylinder retreats. The boundary between the removed portion and the non-removed portion can be gently inclined in the axial direction and the circumferential direction of the cylinder.
The device of the present invention is also used for carrying out the above method.

(Embodiment) An example of an apparatus capable of carrying out the present invention on a circular pipe and an embodiment of the method of the present invention by this apparatus will be described in detail below with reference to the drawings.

FIG. 1 is a side view for explaining an example of an apparatus in which the present invention can be implemented, and FIG. 2 is an explanatory view of a flaw position detection and arithmetic processing circuit and a grinding member operation command circuit at the time of flaw detection, and FIG. Fig. 4 is an explanatory view of an operating circuit for grinding a grinding member, Fig. 4 is a perspective view of a narrow width reciprocating rotary mechanism of a cylinder, and Figs. 5 and 6 are views showing examples of flaws.

(Apparatus) First, in FIG. 1, 10 is a base of the apparatus, 11 is a circular tube 1A holding portion located on one end side of the base and capable of reciprocating,
12 grinding portion provided on the other end of the base 10, 13 is a known marking material applying point detecting portion provided on the holding portion 11 side than the grinding unit 12, 14, 14 ...... is a circular tube It is a columnar support part having a well-known structure having a rotatable support roll.

As shown in FIGS. 1, 2, and 4, the holding portion 11 includes a substrate 20 reciprocally mounted on the base 10 and a gate provided on the substrate 20 at an end on the grinding portion 12 side. Shaped frame 21
And the protruding arm 22 provided in the frame portion 21 so as to be vertically movable.
Clamp base 24 having clamp shoe 23 at the tip of
(FIG. 2), a handle 26 for raising and lowering a clamp base 24 provided on the outside of the frame 21, and a side of the clamp base 24 opposite to the side where the projecting arm 22 is located. The rotation drive motor 27 of the clamp shoe 23, which is connected to the extended portion 22a of the arm 22 via the fixed gear 22b, the rotation pulse generator 28 installed in the rotation drive motor 27, and the protrusion arm 22 that does not rotate. And a clamping cylinder 29 for reciprocally moving the rod 23a which is reciprocally inserted thereinto. As shown in FIG. 4, the clamping arm 23 is provided with a protruding arm 22 as a mechanism for reciprocally rotating. The extended portion 22a of
30a attached to the motor, a motor 30b for driving the shib 30a, and a disc 30 fixed to the output shaft of the motor 30b.
c, a disc 30c and a link 30d whose end portions are rotatably attached to the shib 30a, respectively. Further, as shown in FIG. 2, the link 30d is attached to the base in the longitudinal direction of the base 10. The mating substrate 20 with the extending rack 31 (FIG. 2)
Drives a gear 32 rotatably attached to the circular pipe holding portion 11
A circular tube holding portion drive motor 33 for moving forward and backward, and a pulse generator 33 for this motor are provided.

Next, the grinding part 12 is slidably mounted on a reciprocating table 41 slidably mounted on a fixed bar 40 horizontally provided on the base 10 , and columns 42, 42 standing on the reciprocating table 41. A supporting portion 44 of the grinder 43 which is mounted so as to be movable up and down, a drive motor 45 of the grinder 43 (FIG. 2), a lifting cylinder 46 for raising and lowering the supporting portion 44 of the grinder, and the reciprocating table 41. A large gear 47 driven by a motor (not shown) for reciprocating the gear, a connecting rod 48 connecting the large gear 47 and the reciprocating carriage 41, and a small gear 49 meshing with the large gear 47 and having a gear ratio of 1/2. A pressure booster 50 operated by rotation of the small gear 49 and a circuit connecting the pressure booster and the lifting cylinder 46.

As shown in FIG. 2, a signal processing unit 51, an arithmetic processing unit 52, a control command unit 53, and a pipe end detector 54 are provided, and the signal processing unit 51 includes a pipe end detector 54 and a marking application point. Signals are input from the detection unit 13 , the rotary pulse generator 28, and the pulse generator 34 of the circular tube holding unit drive motor, and these are output to the arithmetic processing unit 52. The signals from the pulse generators 28 and 34 are directly input to the arithmetic processing section 52, and the arithmetic result is output to the control command section 53. A circuit is formed so that the control command section 53 outputs to the clamp shoe rotation drive motor 27, the circular tube holding section 11 drive motor 33, the grinder drive motor, and the grinder support section lifting cylinder 46.

(Method) Since the automatic grinding device for an outer surface flaw of a circular pipe shown in FIGS. 1 to 4 has the above-described structure and circuit, as shown in FIG. 1, one end of the circular pipe 1A is clamped by the clamp shoe 23. After mounting the circular tube 1A on the support rolls 14, 14, ..., While rotating the circular tube 1A by the clamp shoe rotation drive motor 27, the circular tube 1A was mounted on the base 10 by the drive motor 33 of the circular tube holding portion 11 . When the gear 32 that meshes with the rack 31 is driven to move the circular pipe holding portion 11 toward the right in the figure,
The signal from the circular pipe end detector 54, the detection signal from the marking application point detector of the detection unit 13 , and the pulse signals from the pulse generators 28 and 34 are sequentially input to the signal processing unit 51 and stored therein. When the rear end of the circular pipe passes the marking material application point detector, the control command unit 53
The circular pipe holding portion 11 is stopped by a command from the. In the meantime, the arithmetic processing unit measures the distance and the number of revolutions of each of the marking material application points from the tip of the circular pipe, and performs the arithmetic processing of the length of each marking material application point based on the input. After that, the circular pipe holding unit 11 holding the circular pipe starts the backward movement when the circular pipe holding unit drive motor 33 is started by the command from the control command unit 53, and the control signal to which the processed signal is input is input. When the marking application point is reached by the signal from the command section 53, the backward movement is decelerated, the clamp shoe rotation drive motor 27 is started to make the application point end face the grinder 43, and then the command from the control command section 53 is applied. As shown in FIGS. 2 and 3, the pressurized fluid P is sent to the upper chamber of the cylinder 46 through the grinder 43 lifting / lowering switching solenoid valves 55 and 56 to lower the already rotating grinder 43. The circular tube 1A is brought into contact with and ground. This grinding is performed by the control command unit 53
Then, the circular tube holder drive motor 33 and the clamp shoe rotation drive motor 27 are commanded to start, and the marking material is applied only to the coating portion. At this time, the grinder 43 is operated by the rotation of the large gear 47 via the small gear 49.
A small width reciprocating motion is repeated in the axial direction of the circular pipe by the movement of the piston 50a of 0, and as shown in FIG. 3, the grinder 43 is at the center position of the small width reciprocating motion, that is, at the center position of the marking material application portion. Sometimes, the meshing of the large gear 47 and the small gear 49 is adjusted so that the piston 50a of the booster 50 comes to the left end (on the drawing) of the cylinder of the booster 50, and the grinder is raised and lowered by the fluid supply from the booster 50. By increasing the downward pressure of the cylinder 46, the grinder 43 is strongly pressed against the circular pipe to grind a lot, while the rotation of the large gear 47 and the small gear 49 causes the piston 50a to move on the opposite side, although not shown. That is, when it is at the right end of the cylinder of the pressure intensifier, the grinder 43 is at the right end or the left end of the narrow width reciprocating motion, that is, at the right end or the left end of the marking material application portion. And the pressing weakly grinder 43 in a circular tube lowering the downward pressure of the grinder elevating cylinder 46 to return the fluid to the intensifier 50 to the contrary, a little grinding.

Therefore, there is no step at the boundary between the marking material coated portion and the uncoated portion in the axial direction of the circular pipe, and the surface becomes a smooth inclined surface.

At the start of the retreat of the circular pipe 1A, the drive motor 45 of the grinder 43 and the drive motor 30b of the shib 30a for causing the clamp shoe 23 to make a small reciprocating rotary motion have begun to rotate, and accordingly, the marking material application location is changed. When the grinding is performed as described above, the circular pipe 1A is reciprocally rotated with a small width, whereby the circular pipe 1 at the marking material application portion is rotated.
The vicinity of A in the circumferential direction is where the above-mentioned weak pressing is performed for grinding, and it becomes an inclined surface and no step is formed.

A specific example of flaw grinding will be described with reference to FIGS. FIG. 5 shows a cylinder having continuous flaw K1 and single flaws K2 and K3.
The figure is a development view of the cylinder in FIG. These flaws K1, K
For the grinding of K2 and K3, the arithmetic processing unit 52 quantifies and stores each flaw position, determines the grinding order, and first determines the L of the flaw K1.
The C portion and the LB portion were continuously ground, then the flaws K2 and K3 of the LB portion were ground, and then the flaws of K1 and K3 of the LA portion were ground.

(Effect of the Invention) According to the present invention, since only the marking material application portion and its vicinity can be automatically ground, the reduction in the outer diameter of the finished column is reduced, and the number of non-qualified products is greatly reduced. It is possible to do this, and it is possible to completely avoid the disease caused by the vibration of the hand grinder.

In addition, since the vicinity of the marking material application point is an inclined surface in both the axial direction and the circumferential direction of the cylinder, there is no step, so
The effect is that the appearance is beautiful and no accidents such as cutting hands occur.

[Brief description of drawings]

FIG. 1 is a side view for explaining an example of an apparatus capable of implementing the present invention on a circular pipe, and FIG. 2 is a position detection and arithmetic processing circuit for a flaw portion at the time of flaw detection and a grinding member operation command circuit and the like. Explanatory diagram, FIG. 3 is an explanatory diagram of an operating circuit at the time of grinding a grinding member, FIG. 4 is a perspective view of a narrow width reciprocating rotary mechanism of a cylinder, and FIGS. 5 and 6 are diagrams showing examples of flaws, FIG. 9 is a side view for explaining the conventional automatic grinding method, FIG. 8 is a view taken along the line AA of FIG. 9, and FIG. 10 is a view taken along the line BB of FIG. 10 ... Base, 11 ... Circular tube holding part, 12 ... Grinding part,
13 ... Detector, 1A ... Circular tube, 20 ... Substrate, 21 ...
... Gate-shaped frame, 23 ... Clamping shoe, 24 ... Clamping base, 27 ... Clamping rotation drive motor,
28 ... Rotating pulse generator, 30a ... Sibu (mechanism for causing clamp clamp to make small-width reciprocating rotation movement) 30b ... Shiv drive motor (mechanism for making clamp shoe to make small-width reciprocating rotation movement), 30c ... Of motor 30b Disc of output shaft (mechanism to make small-width reciprocating rotation in clamp shoe) 30d ... Link connecting disc 30c and shib 30a (mechanism to make small-width reciprocating movement in clamp shoe) 31 ... Rack, 32 ... Rack Gears that mesh with 33, ...
... Cylinder holding part drive motor, 34 ... Pulse generator for cylinder holding part drive motor, 41 ... Reciprocating table, 43 ...
... Grinder (grinding member), 44 ... Grinder support part, 45 ... Grinder drive motor, 46 ... Support part lifting cylinder, 47 ... Large gear, 48 ... Continuous rod, 49 ... Small gear, 50 ...... Pressure booster, 51 ...... Signal processing unit, 52 ...... Calculation processing unit, 53 ...... Control command unit, 54
...... Cylinder end detector.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Noboru Sasaki 4-12-28 Funato, Itabashi-ku, Tokyo Inside the Tokyo Division, Mishima Kosan Co., Ltd. (72) Shigeru Kiyota 4-3-3 Funado, Itabashi-ku, Tokyo 1 Tokyo Works, Nippon Steel Co., Ltd. (56) Reference JP-A-58-143952 (JP, A)

Claims (2)

[Claims] 1. A marking material is applied to a flaw on the outer surface of a cylinder,
While advancing in the axial direction of the cylinder while rotating the cylinder, the outer surface of the cylinder is inspected with a visual field of a predetermined width corresponding to the rotation speed and the advancing speed to detect the marking material application point and the detected position. Measure the distance from the cylinder end to the marking material application point and the number of rotations from the rotation start position, and after performing the calculation process based on this measurement value, retract the cylinder, and at the time of this retract, in the calculation process Based on the operation command, the grinding member that makes a small reciprocating linear motion in the axial direction of the cylinder strongly abuts at the marking material application point of the cylinder that makes a small reciprocating rotary motion around the cylinder axis. A method for grinding an outer surface flaw of a cylinder, characterized in that the cylinder is weakly contacted in the vicinity of a portion where the marking material is applied in the axial direction of the cylinder and ground. 2. A columnar holding portion located on one end side of the base so as to reciprocate on the base, a grinding portion provided on the other end of the base, and the holding portion rather than the grinding portion. And a column end detector, which is provided on the side of the base for detecting the location where the marking material is applied to the column, and the column holder is a substrate mounted on a base so as to reciprocate, and this substrate. A clamp base body that is vertically movable in a gate-shaped frame portion fixed to the top, a motor that rotates a clamp shoe that protrudes from the clamp base body and is rotatably attached to the base body, and a rotation pulse installed in the motor. A generator, a mechanism for reciprocally rotating the clamp shoe in a small width, a gear that meshes with the rack provided on the base, a columnar drive motor that drives this gear, and a pulse generator for this motor. The above-mentioned grinding unit has the above-mentioned A reciprocating table mounted on a fixed bar horizontally provided on the base, a supporting member for a grinding member provided on the reciprocating table so as to be vertically movable, and a drive motor for the grinding member,
As a mechanism for reciprocating the lifting cylinder of the support portion and the reciprocating table, a large gear that is driven, a connecting rod that connects the large gear and the reciprocating table, and the number of teeth that mesh with the large gear A booster operated via a gear with a ratio of 1/2,
It has a circuit connecting the pressure booster and the lifting cylinder, the cylinder end detector, the detection unit, the rotation pulse generator,
A signal processing unit to which a signal from the pulse generator for the columnar holding unit drive motor is input, a signal from this signal processing unit, and an arithmetic processing unit to which the signals from both pulse generators are input and which performs an operation, A control command unit that inputs the result of this arithmetic processing and outputs a command to each of the clamp shoe rotation drive motor, the cylinder holding unit drive motor, the grinding member drive motor, and the grinding member support unit lifting cylinder is provided. It is an automatic grinding machine for cylindrical outer surface defects.