JPS5937189B2 - Finishing equipment for curved surfaces - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for polishing and finishing a workpiece formed into a curved shape, such as a fuel tank of a motorcycle.

A fuel tank for a motorcycle is manufactured by combining left and right halves and welding them together.

For this reason, a weld bead is formed in the front-rear direction at the center portion of the tank in the width direction, and the bead exposed on the outer surface is removed by polishing. Therefore, the present applicant first applied for the U.S. Pat.
No. 5812 and Utility Model Application No. 54-91419, we proposed an apparatus for polishing and finishing workpieces having a curved external appearance, such as tanks. This involves polishing a workpiece by swinging it in one direction relative to a polishing tool.
As shown in FIGS. 8 and 9, the fuel tank W has flat surfaces W1 and W2 at the front and rear, and the curved surface W3 serving as the finished surface intersects the boundary between these flat surfaces W0 and W2. The intersection points are A and B. When polishing a workpiece that has at least two or more intersection points A and B in this way, in the above device, the workpiece is set on the top of the arm that swings around the lower end, and the workpiece is swung. Since W3 is formed with a non-uniform radius of curvature, the polishing speed between the workpiece and the workpiece changes, resulting in uneven polishing finish.
Since the workpiece is polished while being oscillated in one direction, the vicinity of the intersection point A or B cannot be polished with a tool. In other words, the intersection point A or B is left over from the automatic polishing operation and must be manually polished as a post-work. I had to sand it. The present invention has been made to effectively solve the conventional problems as described above, and an object of the present invention is to be able to polish and finish curved surfaces at the same speed, and to have at least two or more points of intersection where the surfaces intersect. A curved surface part that enables automatic polishing of the curved finished surface including all the intersection points of the workpiece, thereby eliminating manual work and improving workability, as well as stabilizing quality. In order to achieve this object, the present invention provides a finishing device that performs processing by moving a polishing tool positioned at one intersection point from the intersection point while keeping an inclination angle with respect to the finished surface. After starting and reaching the desired position, move the tool away from the workpiece, change the posture and position the tool at another intersection,
It is characterized in that it is moved in the opposite direction to a position that overlaps the arbitrary position while giving an inclination angle opposite to the above.

A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 is a sectional side view of a main part showing the entire apparatus, and the workpiece W to be polished by the apparatus is a fuel tank of a motorcycle in this embodiment.

The tank is constructed by joining the left and right halves by welding, and the resulting welding bead W4 on the outer surface is polished and removed by this apparatus. Two mounting jigs 10-1 and 10-2 are prepared for mounting the work W, and the support plate 11 provided with the mounting jigs 10-1 and 10-2 is attached to the shaft 1.
A pinion gear 15 is fixed to the lower part of the shaft 12 and rotates around the shaft 12 and meshes with a rack 14 provided at the tip of the piston rod 13a of the cylinder 13.
The shaft 12 and the support plate 11 rotate due to the reciprocating movement of the shaft 3a. Workpiece W-1 set in mounting jig 10-1, 10-2
, W-2 is thereby changed in position, and Arayo 16-1
, and 16-2 for finishing, respectively. That is, in this apparatus, the work W is subjected to rough polishing and finishing polishing. A motor M is mounted on the upper mounting base 21 of the body 20 of the device.
, is fixedly installed, and the driving force of the motor M1 is transmitted to a rotating shaft 23 through a gear-based deceleration means 22, and the three cam plates 24, 25, 26 are rotated by the shaft 23. .

Rack bars 28, 29, and 30, which are biased upward by springs 27, are provided on the fuselage 20 so as to be movable up and down.
Pinion gears 31, 32, 33 are engaged with the rattles formed at the lower end of the rattles that contact and engage with the pinion gears 31, 32, 33, and universal joints 34a, 35a.
, 36a, telescopic shafts 34, 35, 36
is connected. With the above structure, the cam plates 24, 25, 2
The vertical movement strokes of the ratta bars 24, 25, 26 that follow the cam shape of 6 are converted into the amount of rotation of the shafts 34, 35, 36. Two horizontal guide bars 38 and 39 are additionally fixed to the front part 37 of the fuselage 20 in parallel at the top and bottom, and the guide bars 38 and 39 are connected to the first moving block 40 as shown in FIG.
The block 40 is supported by passing through the upper and lower portions 40a and 40b, and the block 40 is guided by guide bars 38 and 39 and is horizontally movable in the length direction of the workpiece W.

Vertical guide bars 41 and 42 are installed in parallel between the upper and lower parts 40a and 40b of the first moving block 40, and the guide bars 41 and 42 pass through the second moving block 43. , 42, so that the workpiece W can move freely in the height direction, that is, in the vertical direction.
The tip of the shaft 34 is connected to the first
It is connected to a pinion gear 44 housed in the lower part 40b of the moving block 40, and the lower guide bar 39 is a rack part that meshes with the gear 44. As the shaft 34 rotates, the first moving block 40 moves horizontally. Similarly, the second moving block 43 is moved horizontally.

The tip of the shaft 35 is connected to a pinion gear 45 installed in the second moving block 43 via a universal joint 35b, and the guide bar 42 is a rack that meshes with the gear 45. The second moving block 43 is moved up and down. As is clear from the above, the cam plates 24 and 25, the rack pars 28 and 29, and the shaft 3
4, 35, etc., a copying motion mechanism 46 is configured to make a copying motion of the second moving block 43, and the copying motion mechanism 46
By setting the cam shapes of the cam plates 24 and 25, the second moving block 43 is moved back and forth (in the length direction of the workpiece) and up and down (in the height direction of the tank) following the curved shape of the workpiece W. There is. The tip of the shaft 36 is a universal joint 36
It is connected to a support shaft 47 which is rotatably inserted and held in the second moving block 43 via b, and by the rotation of the sawdust 36, a step is formed at the tip of the support shaft 47 to extend to the workpiece W side. The arm portion 47a swings around the main body of the horizontal support shaft 47. The weight of the second moving block 43 is supported by a cylinder 48 that is assembled downward to the front part 37 of the fuselage 20, and when the block 43 moves up and down with the rotation of the shaft 35, especially when it moves up. It is designed to be able to move up accurately even in small amounts.

FIGS. 4 and 5 are a plan view and a side view showing the arm portion 47a1 of the support shaft 47 that is moved along with the second moving block 43 and the equipment attached thereto. A short-shaft cylindrical stopper bracket 50 is fitted onto the arm portion 47a of the support shaft 47, and is integrally connected to the arm portion 47a by a pin 51 shown in FIGS. 5 and 6. A protrusion 50 that is separated in the direction and protrudes toward the outer diameter direction.
0 or more equipped with stopper bolts 52 and 53 at a and 50b,
Cylindrical members 54 and 55 are rotatably fitted to the arm portion 47a on both sides of the stopper bracket 50, and the cylindrical members 54 and 55 are connected by a connecting plate 56. An integrated intermediate cylindrical member 57 is rotatably fitted to the arm portion 47a. The cylinder member 57
A stopper portion 57a is provided which protrudes in the outer diameter direction and enters between the stopper bolts 52 and 53. As shown in FIG. 6, the holding portion 50c of the stopper bracket 50 has a cylinder 5
8 is swingably held by a pin 59, and the cylinder 58
The piston rod 58a is attached to the bracket portion 5 of the coupling plate 56.
6a. As shown in FIGS. 4 and 6, motors M2 and M3 are attached to the lower portions of both ends of the coupling plate 56, and the previously described polishing tool 16 is provided on the drive shafts of the motors M2 and M3. The polishing tool 16 is a disc-shaped grinder type, and the roughing tool 16-1 is a rough whetstone, and the finishing tool 16-2 is a finishing whetstone. When the piston rod 58a of the cylinder 58 moves from the solid line to the chain line in FIG.
7 in the counterclockwise direction around the arm portion 47a,
The stopper portion 57a of the cylindrical member 57 is connected to the stopper bracket 5.
It stops at a position 56' where it abuts against the zero bolt 53. As described above, due to the expansion and contraction of the piston rod 58a of the cylinder 58, the polishing tool 16 supported by the arm 47a of the support shaft 47 changes its posture until the stopper portion 57a is regulated by the stopper bolts 52 and 53, and the tool 16 is supported on a support shaft 47 so that its posture can be changed freely. Next, a processing method using the apparatus having the above configuration will be described.

As shown in Figure 8, the intersection point A of the plane W of the workpiece W and the curved surface W3
The polishing tool 16 is positioned at the intersection point A of the outer surface of the tool 16.
contact with.

The copying motion mechanism 46 is operated while rotating the tool 16, and the support shaft 47 attached to the copying motion mechanism 46 is operated.
Then, the tool 16 is moved from the left side to the right side in FIG. 8, following the curved shape of the workpiece W, and the polishing process is started. This movement is performed while the tool 16 is tilted at a substantially constant angle, for example, an inclination angle θ of about 15 degrees, with respect to the curved surface W3, which is the finished surface of the workpiece W. This inclination angle θ is set so that the cam shape of the cam plate 26 corresponds to the curvature of each part of the curved surface W3, thereby rotating the shaft 36 and causing the arm portion 47a of the support shaft 47 to swing. As a result, it is kept substantially constant at each part of the curved surface W3. Furthermore, by creating a correlation between the cam shapes of the cam plates 24 and 25, the moving speed of the tool 16 with respect to the curved surface W3, in other words, the polishing speed can be kept constant during the polishing process, and the workpiece W can be smoothly processed without any unevenness. Can be polished and finished. When the tool 16 has moved to an arbitrary position, in the embodiment shown in FIG. 8, to a position C beyond the fuel injection port W5, (2) the tool 16 is moved upward and separated from the workpiece W;

Next, by operating the cylinder 58, the attitude of the tool 16 is changed, and the outer surface of the tool 16 is brought into contact with the intersection B of the plane W2 and the curved surface W3, and the tool 16 is tilted at an inclination angle opposite to the above. Move it backwards from the right side to the left side, and move it beyond the above position C to position D, which is a lap distance of 1 minute. As a result of the above, not only the weld bead on the curved surface W3 but also the tool 1
If A.6 is moved in one direction with an inclination angle in the same direction, both intersection points A.6 and A.6 cannot be removed. The weld bead in B can also be polished and removed automatically.

If FIG. 9 shows the case of rough abrasive processing using the rough tool 16-1, then FIG. supporting plate 11
By reversing τ, finishing machining of the workpiece W is started from an intersection B, which is different from the case shown in FIG.

In this way, two workpieces W-1 and W-2 are processed by this device.
Both rough polishing and finish polishing can be performed at the same time.

Although the embodiments described above are for the case where the workpiece W is a fuel tank, the apparatus according to the present invention can be applied to any curved workpiece having at least two or more points of intersection where its surfaces intersect. It is.

As is clear from the above description, according to the present invention, it is now possible to automatically polish all finished surfaces of the curved surface of a workpiece, including intersections, using a polishing tool, and polishing is possible in the vicinity of intersections, which was previously required. Manual polishing work can be eliminated,
Work efficiency has been improved and workpieces of uniform and good quality can be obtained.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention; FIG. 1 is a sectional side view of essential parts showing the entire device, FIG. 2 is a sectional view taken along line 2-2 in FIG. 1, and FIG. 3 is a front view of the device. Fig. 4 is a plan view showing the support shaft and equipment attached to it, Fig. 5 is a side view of the same, Fig. 6 is a plan view showing the support shaft and equipment attached to it;
The figure is a sectional view taken along the line 6-6 in FIG. 5, FIG. 7 is a view taken in the direction of arrow 7 in FIG. 5, and FIGS. 8 and 9 are views showing the processing method. In the drawing, W is the workpiece, A and B are the intersection points, 16 is the polishing tool, 46 is the copying motion mechanism, 47 is the support shaft, θ is the tilt angle, and W
,, W2 is a plane, and W3 is a curved surface.

Claims (1)

[Claims] 1. A copying mechanism that moves up and down and back and forth in response to the curved finished surface of the workpiece, and a rotatable copying mechanism that supports the polishing tool and maintains a constant inclination angle of the polishing tool with respect to the finished surface of the workpiece. and a polishing tool attitude change means provided between the polishing tool and the support shaft so as to reverse the inclination of the polishing tool with respect to the finished surface of the workpiece, and at least two or more intersection points where the surfaces intersect. At the intersection point of one of the curved workpiece finishing surfaces, the tilt of the polishing tool with respect to the workpiece finishing surface is reversed by actuation of the attitude changing means, and the curved workpiece finishing surface including all the intersection points is automatically polished. A finishing device for curved surfaces.