KR20020045320A - Apparatus for measuring the index of the spring back - Google Patents

Abstract

PURPOSE: A spring back index measuring apparatus is provided to obtain characteristics value of strip in an accurate and easy manner, while reducing the index measuring time and improve product quality. CONSTITUTION: An apparatus comprises a base(29) having a protractor(27) arranged at the surface of the base; a crimping unit constituted by a first fixing member and a second fixing member spaced apart from each other on the base such that an end of a test piece(17) is inserted, and an interval adjusting member for adjusting intervals between fixing members; a molding arm(21) arranged to be turnable at an end of the first fixing member such that force is applied in one direction, to a free end of the test piece fixed to the crimping unit, so as to give curvatures to the test piece; and a thickness measuring unit having a gauge(23) attached to the second fixing member, and a pole which is penetrated through the crimping unit and extended to the inner surface of the first fixing member.

Description

Apparatus for measuring the index of the spring back}

The present invention relates to a device for measuring the spring back index (SBI; spring back index) for strips, such as cold rolled products and plated products, and more particularly, it is possible to easily measure the thickness and spring back index of the strip Relates to a device.

In general, in order to measure the characteristics such as the quality of the product in a continuous line such as a strip, based on the Rockwell 30T hardness test, but as the product becomes thinner and the product characteristics change, only the hardness value is a practical product. The characteristics were unknown.

Therefore, springback index measurement was introduced to improve this. The springback index measurement method uses a forming arm to bend the test piece by 180 °, and then returns the forming arm to its original position. As a method of measurement, the springback index measured thereby is used for manufacturing characteristics of the can and is closely related to the yield point of the product.

As described above, the conventional measuring device for measuring the characteristics of the strip, with reference to Figure 1, consisting of a 1/2 inch housing mandrel (Housing Mandrel), the test piece bend 10 and the test piece thickness to bend the test piece, the test piece thickness It consists of a micro meta (15) that can measure, and a protractor (16) for measuring the bending angle of the bent molded specimen.

Here, the test piece 17 is made of a cold rolled steel sheet having a size of 150 × 25 mm, the thickness of the test piece is measured by the micro meta (15), after which the test piece 17 is inserted into the test piece insertion hole of the test piece bend 10 After inserting into (14), firmly fix the test piece (17) using the test piece fixing bolt (13). Then, by holding the handle 12 of the forming arm 11 in the direction indicated by the arrow, the test piece 17 is rotated at a predetermined angle, for example, 180 degrees.

After repositioning the forming arm (11), loosen the specimen fixing bolt (13) and pull out the formed specimen. After the molded test piece 17 'is recorded in correspondence with the protractor 16, the molded angle is recorded, and then the springback index is measured by drawing the test piece thickness value and the formed angle in a straight line on a nomograph.

However, according to the conventional measuring method as described above, the thickness of each test piece must be measured using the micro meta 15, and the molded test piece 17 'is removed when the test piece bend 10 is removed. The test piece may be deformed, and since the angle of the formed test piece 17 'must be measured by the protractor 16, there is a problem that measuring the characteristics of the strip is complicated and cannot accurately measure the springback index. .

The present invention has been made to solve the conventional problems as described above, by measuring the thickness and the bending angle of the strip under the optimum conditions by processing a strip specimen of a predetermined size can be obtained accurately and simply the characteristic value of the strip The purpose is to provide a springback index measuring device.

1 (a), (b) and (c) show a typical springback index measuring device, micrometa and a protractor.

Figure 2 is a perspective view showing a springback index measuring apparatus according to the present invention.

Figure 3 is an exploded perspective view showing a fastening device and a cover employed in the housing mandrel body according to the present invention.

Figure 4 is an exploded perspective view showing a forming arm according to the present invention.

5 is a plan view of the springback index measuring apparatus according to the present invention.

<Description of Symbols for Major Parts of Drawings>

20: housing mandrel

21: forming arm

23 dial dial

24: fastening handle

25: band spring

27: protractor

29: base

36: pin

40: spacing adjusting member

41: sleeve

In order to achieve the above object, according to the present invention, the springback index measuring device is a base having a protractor is formed on the surface, the test piece to be measured is fixedly mounted and spaced apart at predetermined intervals on the base so as to support one surface A fixing member having a housing mandrel having a supporting surface and an inclined surface spaced apart from the supporting surface of the housing mandrel at predetermined intervals and having an inclined surface facing the supporting surface, and an inclined surface inserted between the housing mandrel and the fixing member and corresponding to the inclined surface; Clamping means consisting of a wedge-shaped pressing member having a rotatable mounting on one end of the housing mandrel to bend the test piece by applying a force in one direction to a free end of the test piece inserted and fixed between the housing mandrel and the pressing member. Forming arm to be fixed to the outside of the fixing member Air gauge is attached to one end and which is characterized in that the configuration in the thickness measuring means has a holding that penetrates the fixing member and the pressing member of the crimping means, and extends to the support surface of the housing mandrel.

Hereinafter, with reference to the accompanying drawings will be described a preferred embodiment of the present invention.

According to the present invention, the measuring device for measuring the springback index of the test piece made of cold rolled steel sheet is a test piece bent portion fixed to the base 29 and the base 29 is formed with a protractor 27, the test piece bent portion It consists of a thickness measuring section for mounting and measuring the thickness of the test piece.

The test piece bent portion has a housing mandrel 20 having an insertion portion into which one end of the test piece 17 is inserted, and an interval adjusting member 40 for adjusting the interval of the insertion portion to fix one end of the test piece 17 inserted into the insertion portion. ) And an L-shaped forming arm 21 which exerts a force in one direction on the free end of the test piece 17 so that the test piece 17 inserted into the housing mandrel 20 is bent.

The housing mandrel 20 has a first fixing member and a second fixing member spaced apart at predetermined intervals, and the first fixing member has a relatively longer length than the second fixing member. In addition, an upper surface of the first fixing member is formed in a semi-circular shape, and an insertion hole into which the pin 36 is inserted is hingedly fixed to the forming arm 21 described above.

A supporting surface on which the test piece 17 inserted into the inserting portion of the housing mandrel 20 is supported is provided to the first fixing member, and the corresponding surface of the second fixing member corresponding to the supporting surface is an inclined surface. In addition, the spacing adjusting member 40 inserted into the insertion portion of the housing mandrel 20 to adjust the spacing between the housing mandrel 20 is made of a trapezoid having both sides corresponding to the support surface and the inclined surface. One surface of the spacing adjusting member 40 is provided with a fastening handle 24 for moving the spacing adjusting member 40 in the longitudinal direction of the test piece 17 in the insertion portion of the housing mandrel 20.

The dial gauge 23 fixedly installed on the outer surface of the second fixing member of the housing mandrel 20 is connected to one end of the post extending through the second fixing member to the support surface of the first fixing member. Therefore, when the test piece 17 is inserted into the insertion part of the housing mandrel 20, the support post will move to the outside of the second fixing member, and the amount of movement of the support post will be displayed on the dial gauge 23. Will be measured.

Meanwhile, a sleeve 41 is provided between the first fixing member and the gap adjusting member 40, and the sleeve fixing bolt 32 is second fixed to prevent the sleeve 41 from being separated from the housing mandrel 20. It is fastened to the sleeve 41 through the member and the gap adjusting member 40. The through hole 40a formed in the gap adjusting member 40 to penetrate the fixing bolt 32 is formed in an elongated ellipse so as not to interfere with the movement of the gap adjusting member 40 in the insertion portion of the housing mandrel 20.

The L-shaped forming arm 21 is pivotally mounted by a pin 36 inserted into an insertion portion formed on the upper part of the first fixing member, and a handle 22 is provided at one end thereof. Then, a band spring 25 for assisting the bending of the test piece 17 is provided to the forming arm 21.

Hereinafter, the operation of the springback index measuring apparatus according to the present invention.

When one end of the test piece 17 processed to a predetermined size with the scale of the dial gauge 23 set to 0 is inserted between the insertion portion of the housing mandrel 20, in particular, between the first fixing member and the sleeve 41. One end of the test piece 17 is fixed to the housing mandrel 20 by moving the gap adjusting member 40 by adjusting the fastening knob 24. Since the strut moves to the outside of the second fixing member, and the movement amount is displayed on the dial gauge 23, the thickness of the test piece can be measured. At this time, the thickness of the test piece 17 is measured and recorded in 2/1000 mm units on the dial gauge 23.

In order to maintain close contact with the test piece 17, the tension of the roller 30 is adjusted using the roller tension bolt 28. Then, when the forming arm 21 is rotated in one direction while the forming arm handle 22 is held, the test piece 17 is bent along the circular surface of the upper part of the first fixing member. After that, when the forming arm 21 is returned to its original position, the test piece 17 'is kept in a bent state.

At this time, the bending angle of the test piece 17 'can be easily measured by the protractor 27 displayed on the base 29.

As described above, the spring back index of the test piece is measured by drawing a straight line so that the thickness and the bending angle of the test piece measured according to the present invention coincide with the test piece thickness and the formed angle in the ASTM G-67 nomogram.

Therefore, according to the present invention, the springback index of the test piece is easily measured by fixing the test piece with the fastening handle after inserting the test piece and measuring the thickness of the test piece with a dial gauge and measuring the bending angle of the test piece with a protractor attached to the base. Since it can be measured, it is possible to shorten the index measurement time and contribute to quality improvement.

The foregoing is merely illustrative of the preferred embodiments of the present invention and those skilled in the art to which the present invention pertains may make modifications and changes to the present invention without departing from the spirit and gist of the invention as set forth in the appended claims. It should be recognized.

Claims (3)

Base with protractor formed on the surface, Clamping means consisting of a first fixing member and a second fixing member to be inserted into one end of the test piece to be measured spaced apart at predetermined intervals on the base, and a gap adjusting member for adjusting the gap between the fixing members. , A forming arm pivotally mounted to one end of the first fixing member to bend the test piece by applying a force in one direction to a free end of the test piece fixed to the crimping means, A spring having a gauge fixed to an outer side of the second fixing member, the thickness measuring means having a strut extending through the crimping means and extending to the inner surface of the first fixing member Bag index measuring device. The method of claim 1, The gap adjusting member has a trapezoidal cross section, and the spring back index measuring apparatus further comprises a drive member for moving the gap adjusting member in the longitudinal direction of the test piece between the fixing member. The springback index measuring apparatus according to claim 2, wherein a plate-shaped sleeve is interposed between the first fixing member and the gap adjusting member.