JP2523265Y2 - Metal angle straight scale - Google Patents

Description

[Detailed description of the invention] (Industrial application field) Metal angle straight gauge (JIS B 7534-1987), that is, a so-called "key scale" (curve scale) in which a long branch and a short branch are integrally connected at 90 °. ) ”, With more accurate measurements,
An attempt is made to propose a metal angle straight line that can be creased.

(Prior Art) Each diagonal part of a flat rhombus having an obtuse angle equal to each other and an acute angle slightly different from each other,
The former is a concave arc that recurs with each other, the latter is a line segment parallel to each other, and the short branch and the long branch of a strip having a substantially octagonal cross-sectional profile connected to each side form 90 °, metal Angle measuring,
In particular, the A type shown in Table 1 of JIS B 7534-1987 has a nominal size corresponding to the scale length of the long branch, 300, 450 and 5
Stainless steel (JIS G), each of which is about 15.0 mm wide and about 1.4 mm thick in the thickness direction.
4303), but in order to combine the short and long branches into an orthogonal L-shape, a corner piece that has a slightly thicker equal leg length and an L-shaped appearance with almost the same cross-sectional contour as the above strip is used. In particular, Japanese Patent Publication No. 55-40336 discloses that a joint is welded to both legs of a short branch and a long branch.

Regarding this corner piece, L
It is a common practice to gradually increase the wall thickness toward the corner of the character, and even when short and long branches are welded together without using a corner piece, welding is performed from both sides at the corner. It is disclosed in Japanese Utility Model Laid-Open Publication No. 47-20248 that overlaying is performed, and in particular, the corners of the long straight portion and the short straight portion formed integrally by a rolling roll are cut off diagonally once, and the thick wall is renewed. As described in Japanese Patent Application Laid-Open No. 53-56052, it has been conventionally required to weld the corners of this kind.

(Problem to be solved by the present invention) As described above, the corner of the wall thickness which has been regarded as indispensable in the past is regarded as the zero point (outer scale base point) of the scale applied to the short and long branches. Therefore, when the scale surface is placed on the object to be measured, the scale surface will be inclined and the measuring accuracy will be impaired.In practical use, the scale surface should be as short as possible to fit the object as closely as possible. As a result of the crimping while bending the branches by hand, excessive bending stress is applied, for example, to the weld between the two legs of the corner piece. Heat treatment is not applied to this corner piece, and even if heat treatment is performed for a long time, it is difficult to obtain a uniform heat treatment effect (hardness of Hv: 320 or more) compared to short and long branches due to the difference in thickness, For example, a flatness test when bent back (bend a long branch, add a strong song that makes the distance between both ends of the long branch narrower than 3/4 of the scale length, and return The result of measuring the gap of the scale surface on the upper side is not good, but on the other hand, it has become clear that the special advantage of thickening the local part of the corner can not be found in practice .

Therefore, without increasing the thickness of the protruding corners, the short and long branches are combined into an orthogonal L-shape by direct butting welding which provides a sufficiently strong joint to the facing surfaces of their beveled ends, Therefore, it is an object of the present invention to provide a low-cost metal angle straight gauge which can easily realize accurate length measurement and crease without thickness unevenness.

SUMMARY OF THE INVENTION The present invention reverts each flat diagonal diagonal part having an obtuse diagonal which is equal to each other and another acute diagonal which is slightly different from each other. Concave arc, the latter being a metal angle straight line having an orthogonal L-shaped short branch and a long branch of a strip having a substantially octagonal cross-sectional profile connected to each side by a line segment parallel to each other. In the above, the short branch and the long branch have a uniform cross section of the above-mentioned substantially octagonal shape over their entire length, and at the orthogonal intersection of the short branch and the long branch, the long branch and the outgoing corner of the part have the same length. Each of the beveled ends of the short branches face each other in an L-shape, and has a direct welding seam by inert gas-encapsulated arc heating applied without any excess over the outgoing and incoming corners of the orthogonal common part. It is a metal angle straight scale.

FIG. 1 to FIG. 3 show an example of a scale according to the present invention.
In the figure, 1 is a short branch, 2 is a long branch, and both are JIS B 7534-1987 Table 1
A stainless steel strip roll-finished to the above-mentioned substantially octagonal cross-sectional profile shown as an A-shape, and the short branch 1 and the long branch 2 are uniformly distributed over the entire length in the longitudinal direction. 90 degrees by joining the sky as having a cross-sectional shape
The butt welded ends 1 'and 2' are joined by direct butt welding.

Immediately after this, welding like applying arc heating in argon is suitable, but subsequent processes such as finishing, heat treatment, polishing, grading to allow etching, inking and plating Can be performed in accordance with the conventional method.Especially for heat treatment, when the entire welded curved scale is put into a furnace, the thickness distribution in the width direction including the orthogonal common part of the short and long branches 1 and 2 since there is no change to, it is uniformly heated as a whole, suitable quenching and tempering (hardness H _v: 320 or more) is performed, compared to that using a conventional corner piece "strength" is yet high uniform , "Bend"
In particular, the test results are remarkably excellent, in addition to the fact that there is no breakage due to a sharp bending back for the "flatness test".

In the figure, 3 is a scale surface, 4 is an outer surface, 5 is an inner surface, and 6 is a saw, and 7,8 are end surfaces, and 9,10 are margins.

On the other hand, the conventional curved scale has an appearance shape substantially similar to that of FIG. 1, but has an appearance L-shaped corner piece welded and united on two joining lines indicated by phantom lines 11 and 12 in FIG. (See FIGS. 4, 5, and 6.) At the ends of both legs, 13 and 14 are made to have the same cross-sectional shape as the short branch 1a and the long branch 2a. By gradually increasing the taper, the projected corner of the orthogonal common portion was made thick, and as a result, the maximum thickness was exhibited at the scale base point, and the scale surface near the welded portion was raised from the measured surface. It is difficult to measure accurately, and it is not possible to perform uniform heat treatment including corner pieces, so it is necessary to use it forcibly to suppress it repeatedly, resulting in bending, breakage and irregularity of flatness etc. at the welded part It was the cause.

(Action) The curved length of this invention is that the short and long branches having a uniform substantially octagonal cross-sectional shape are directly butt welded over the protruding corner and the incoming corner of the orthogonal common part, and particularly inert gas encapsulation. Since they are joined by arc heating, the thickness distribution in the width direction including the orthogonal common part of the short branch and the long branch does not change throughout the entire length of the short branch and the long branch, so that the scale surface rises from the surface to be measured. In addition to being able to accurately measure lengths and creases, there is no need to force it along, so there is no need to apply unnecessary bending force, and uniform heat treatment is possible, so it is durable against bending and irregularity In addition to the advantages described above, the advantage that only one welding is required is added.

(Example) FIG. 1 to FIG. 3 illustrate a specific example in which the present invention is implemented on a curved line having a nominal size of 500 mm.

(Effects of the Invention) The curved length of the invention has no thick-walled portion especially at the protruding corner of the orthogonal common portion of the short and long branches, and therefore does not require the use of a corner piece, and therefore has a uniform shape. In addition to being capable of heat treatment, there is little breakage or deviation, and the reduction of welding spots that causes it is advantageous not only in terms of cost and durability but also the scale surface is measured when measuring length Since it does not have a thick portion that rises from the surface, accurate length measurement and creases can be made, which is convenient for use.

[Brief description of the drawings]

 1 is a front view, FIG. 2 is a side view, FIG. 3 is a plan view, FIG. 4 and FIG. 5 are side and plan views of a conventional curved line, and FIG. FIG. 1 ... short branch 2 ... long branch 1 ', 2' ... beveled end

Claims (1)

(57) [Scope of request for utility model registration] 1. A flat, rhombic diagonal section having an obtuse angle equal to one diagonal and another acute angle slightly different from each other, wherein the former is a concave arc reciprocally curved to the other, and the latter is parallel to each other. The straight angle of the metal strip having a short branch (1) and a long branch (2) forming an orthogonal L-shape is a strip having a substantially octagonal cross-sectional profile connected to each side at a straight line segment. The short branch (1) and the long branch (2) have a uniform cross section of the above-mentioned substantially octagonal shape over their entire length, and are formed at an orthogonal intersection of the short branch (1) and the long branch (2). The beveled ends (1 ') of the long branch (1) and the short branch (2) over the outgoing and incoming corners of the portion,
(2 ') facing each other in an L-shape, and having a direct butting weld seam by inert gas-encapsulated arc heating applied without any excess over the outer corner and the inner corner of the orthogonal common part. To make a straight angle made of metal.