JPH0347818Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Field of Application> The present invention relates to a chamfering device that can automatically perform a thread chamfering process on the chamfered ridges of shaped steel constituting steel structural members such as bridges.

<Conventional technology> The corners of plate surfaces of shaped steel that make up steel structural members such as bridges have sharp ridges due to curvature during rolling, etc., so the film thickness of anti-corrosion paint becomes thinner. Or, it is in a state where it is easy to peel off. For this reason, the corners of the plate surface of the shaped steel (hereinafter referred to as chamfered ridges) are chamfered with a width of 1 to 2 millimeters or rounded to the same degree to ensure complete paint adhesion. I try to become something.

As described above, conventionally known thread chamfering methods include one using a rotary cutting tool such as a milling cutter, and one using a compression molding roller that utilizes plastic deformation of the workpiece.

<Problems to be solved by the invention> Conventional thread chamfering devices that use rotary cutting tools generally process mechanical parts, such as steel structural members such as bridges, which suffer from gas cutting distortion and irregularities in the machined surface. For certain machining objects, the machining speed is extremely slow and the machining method cannot be used at all, and there is a risk that burrs may remain and cause a decrease in quality.

On the other hand, the type using compression molding rollers is
Since it is necessary to support the reaction force of forming pressure, it is fundamentally impossible to avoid increasing the size of the equipment, and it must be installed and used in a fixed location, and therefore the processing object is also processed before the assembly of flat steel etc. It is limited to the materials of

Note that thread chamfering is sometimes performed using a hand grinder, but when rounding the chamfer ridge, grinding is performed at least three times to form an approximate roundness. Increases labor and work time.

SUMMARY OF THE INVENTION In view of the above-mentioned problems with the conventional thread beveling process, it is an object of the present invention to provide a highly efficient chamfering device that is easy to carry and has excellent quality after processing.

<Means for Solving the Problems> The chamfering device according to the present invention includes a drive cart that runs along two mutually adjacent chamfering ridges of the workpiece while straddling the workpiece, and A rotary grindstone is pivotally supported on the driving cart so as to be swingable in mutually perpendicular directions facing the two chamfered ridges, and is capable of grinding the chamfered ridges by coming into contact with each of the chamfered ridges. The grinder is equipped with a pair of grinders, each of which is rotatably mounted.

<Function> The drive cart runs along the chamfered edge of the workpiece,
The drive rotation of the grinding wheel of the grinder, which is attached to this drive cart and pressed against the chamfered edge,
The chamfered ridge portion is chamfered and ground.

<Example> Fig. 1 shows the external appearance of an embodiment of the chamfering device according to the present invention, Fig. 2 shows the left side shape thereof, and Fig. 3 shows the cross-sectional shape in the direction of the -arrow and the cross-sectional shape in the direction of the -arrow, respectively. As shown in FIG. 4, a traveling motor 14 for traveling along the chamfered ridges 13a, 13b of the workpiece 13 is provided at the front and rear of the casing 12 provided with the handle 11 for transportation. A pair of traveling units 15 are attached, and the traveling motors 14 of these traveling units 15
A drive wheel 16 that can be driven and rotated by contacting one side end surface of the workpiece 13 is connected to the drive wheel 16 via a coupling 17. The traveling unit 15 includes a driven wheel 19 which faces the drive wheel 16 while holding the workpiece 13 therein and is biased in the opposite direction via a compression spring 18, and a copying roller 20 which comes into contact with the tip of the workpiece 13. A proximity switch 22 is provided that detects the presence or absence of the workpiece 13 and transmits the detected information to a control unit 21 assembled to the casing 12.

Therefore, the spring force of the compression spring 18 causes the workpiece 1 to
3 is held under pressure by a driving wheel 16 and a driven wheel 19, and as the driving wheel 16 rotates, a copying roller 20 measures changes in the wall thickness of the workpiece 13 and chamfered edges 13.
While the entire device automatically travels along the displacements of the drive motor 14 and the grinder 23a, which will be described later, the control unit 21 determines whether operating conditions are satisfied based on the signal from the proximity switch 22. 23b. Note that the driven wheel 19 has a spring force of the compression spring 18 to pull the driven wheel 19 away from the side end surface of the workpiece 13.
A handle 24 for attaching and detaching the entire apparatus to and from the workpiece 13 is connected thereto.

On the other hand, as shown in FIG. 5 showing the arrow view in FIG. 4, FIG. 6 showing the cross-sectional shape in the - arrow direction, and FIG.
Grinders 23a and 23b are respectively installed.
The spindles 26 are oriented at right angles to each other so as to be inclined at 45 degrees with respect to the side end surface of the workpiece 13, and the base end of the swing plate 27 on which these grinders 23a and 23b are mounted is The running direction of the device and the guide bar 2
The rotary grindstone 25 is pivotably mounted via a pivot shaft 30 perpendicular to the chamfered edges 13a, 13b so as to be able to move toward or away from the chamfered ridges 13a, 13b. This swing plate 27 is attached to the front end of the swing plate 27.
A key groove 32 that engages with a guide key 31 attached to the casing 12 that guides the rocking of the rotary grindstone 2 is carved in the base end of the rocking plate 27.
The chamfered ridge portion 13 is made so that the grinding surface of No. 5 contacts uniformly.
A set piece 33 is integrally provided to keep the height from a, 13b to the swing plate 27 constant.

Therefore, the rotary whetstone 25 is the grinder 23a, 2
3b swings around the pivot shaft 30 while being guided by the guide key 31 due to its own weight, and presses against the chamfered ridges 13a and 13b of the work 13 together with the set piece 33, and as these drive rotations, the chamfered ridges 13a , 13b are chamfered and ground. The amount of chamfering at this time is determined by the amount of chamfer formed on the lower end of the guide key 31 and
Although the adjustment is possible by changing the position of the stopper 34 which is engaged with the stopper 7, it is also possible to adjust the adjustment by using a spring or the like (not shown). In this embodiment, a buffer spring 35 of the slider 29 is attached to the guide rod 28 in order to prevent the rocking plate 27 from rattling as the device travels.

In the embodiment described above, the chamfered ridges 13a, 13b
The rotating grindstone 25 that comes into contact with the pivot shaft 30 is perpendicular to the device.
However, as shown in FIG. 8 showing the external appearance of another embodiment of the chamfering device according to the present invention and FIG. 9 showing the cross-sectional shape in the direction of the - arrow, A pair of pocket covers 36 are attached to the casing 1 via respective pivot shafts 30 parallel to the direction.
These pocket covers 3
A slider 29 to which grinders 23a and 23b are respectively attached may be swingably held by a guide rod 28 fixed to the guide rod 6.
The opening and closing operations of these pocket covers 36 are performed using a handle 37 attached to the pocket cover 36, and the other structure may be the same as the previously shown embodiment or other well-known ones. Components having the same functions as in the previous embodiment are designated by the same reference numerals.

<Effects of the invention> According to the chamfering device of the invention, the traveling cart automatically travels following the thickness of the workpiece and the displacement of the chamfering ridge, and as it travels, the rotating grindstones of the pair of grinders chamfer the adjacent surfaces. Since the ridge was chamfered and ground,
It has become possible to quickly perform thread chamfering on-site without causing burrs like cutting.

[Brief explanation of the drawing]

Figure 1 is a front view of an embodiment of the chamfering device according to the present invention, Figure 2 is its left side view, and Figure 3 is its -
4 is a sectional view taken in the direction of the arrow in FIG. 2, FIG. 5 is a sectional view taken in the direction of the arrow, and FIG.
7 is a plan view of FIG. 5, FIG. 8 is a side view of another embodiment of the chamfering device according to the present invention, and FIG. 9 is a sectional view taken along the - arrow. Also, in the figures, 12 is a casing, 13 is a workpiece, 13a and 13b are chamfered ridges, 14 is a traveling motor, 15 is a traveling unit, 16 is a driving wheel, 19 is a driven wheel, and 20 is a copying roller. , 23
a, 23b are grinders, 25 is a rotating grindstone, 26
28 is a spindle, 28 is a guide rod, 29 is a slider, 30 is a pivot, 34 is a stopper, and 36 is a pocket cover.

Claims (1)

[Scope of utility model registration request] A driving cart that runs along two parallel chamfered ridges of the workpiece while straddling the workpiece, and swings in mutually perpendicular directions facing the two chamfered ridges, respectively. A chamfering device comprising: a pair of grinders which are freely pivotally supported on the driving cart and each of which has a rotatably mounted rotary grindstone that can grind the chamfered ridges by coming into contact with each of the chamfered ridges; .