JPS6144792Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a jig for marking scribed circles for measuring the elongation of a steel plate during press product forming.

The conventional marking method for measuring the elongation of a steel plate during press product forming is based on electrical corrosion using an oxidizing liquid, and therefore has the following drawbacks and problems. That is, because steel plates are handled with bare hands, standard work for handling steel plates cannot be followed, and because electrical systems are handled with bare hands, standard work becomes difficult. In addition, handling oxidizing agents not only causes skin irritation, but also requires a lot of time to prepare for printing, and the printing film breaks quickly, resulting in high costs. As a result, steel plates are wasted, and auxiliary materials used during baking are also wasted.

The purpose of the present invention is to eliminate the above-mentioned inconveniences that existed in the conventional method. a gauge board having a through hole;
a scribing jig that can be fitted into the through hole and has a protrusion for scribing that is harder than a steel plate at the lower end of the outer periphery; the diameter of the through hole is within a dimensional tolerance of 0 to +0.02 mm; The shaft diameter of the tool is −0.02 to −
It is characterized by being constructed within a dimensional tolerance of 0.04 mm. Here, the dimensional tolerance of the hole diameter of the through hole and the shaft diameter of the scribing jig was determined in order to ensure smooth rotation of the scribing jig that fits into the through hole. If it comes off, smooth rotation of the scribing jig cannot be guaranteed.

An embodiment of the present invention will be described below with reference to the drawings.

In the drawings, reference numeral 1 denotes a gauge board, which has through-holes 2 of fixed size at positions corresponding to the grids of a checkerboard-shaped board. Reference numeral 3 denotes a scribing jig, which enables loose fitting into the hole 2 without play and has a protrusion 4 for scribing, which is harder than the steel plate 5, at the lower end of the outer periphery. For example, the through hole 2 has an inner diameter of 10 ⁻⁰ _+0.02 (10.00 to 10.02 mm),
The outer diameter of the fitting part of the marking jig 3 into the through hole 2 is
10 ^-0.02 _-0.04 (9.96~9.98mm),
Moreover, the pitch of the holes 2 is set to 20.00 mm.

In the marking jig consisting of the gauge panel 1 and the marking jig 3 configured as shown in the figure, the fourth
As shown in the figure, set the gauge panel 1 on the steel plate 5 at the required position, insert the marking jig 3 into the through hole 2 of the gauge panel 1, and press it slightly as shown in FIG. When the scribing jig 3 is rotated half a turn as shown by the arrow 6 while applying a scribing load, the protrusion 4 at the lower end of the scribing jig 3 can make a clear scribe in a predetermined circular shape on the upper surface of the steel plate 5. In this case, one marking operation is completed in about 3 seconds.

Note that the necessary locations for marking are determined by the range of molding, but if the through holes 2 of one gauge board 1 are insufficient, the gauge board 1 may be moved.

As described above, the marking jig of the present invention includes a gauge board having through holes of a fixed size provided at positions corresponding to the grid of a checkerboard-shaped board, and a loose fit with no looseness in the through holes. It is a so-called scribing method that consists of a scribing jig with a scribing protrusion on the bottom edge of the outer circumference that is harder than a steel plate, so even non-experts can do it clearly and quickly. Moreover, since the marking method is not based on electrical corrosion as in the past, there are no problems such as malfunctions in handling steel plates or skin irritation of workers, and standard work can be performed. It is possible to reduce the need for auxiliary materials and is extremely advantageous in terms of cost.

[Brief explanation of drawings]

The drawing shows one embodiment of the present invention.
The figure is a plan view of the gauge board, Figure 2 is a cross-sectional front view taken along cutting line A-A in Figure 1, Figure 3 is a front view of the marking jig, and Figure 4 is a state in which the gauge board is placed on a steel plate. FIG. 5 is a partially enlarged cross-sectional view showing a state in which marking work is being performed. 1...Gauge board, 2...Through hole, 3...Scoring jig, 4...Protrusion, 5...Steel plate.

Claims (1)

[Scope of utility model registration request] A gauge board having circular through holes provided at positions corresponding to the grid of a checkerboard-shaped board, and a marking jig that can be fitted into the through holes and has projections for marking harder than a steel plate at the lower end of the outer periphery. Marking characterized in that the diameter of the through hole is within a dimensional tolerance of 0 to +0.02 mm, and the shaft diameter of the marking jig is within a dimensional tolerance of -0.02 to -0.04 mm. jig.