JPH07333124A - Automatic continuous tensile test method for round bar - Google Patents

Abstract

PURPOSE:To heighten automated degree of an automatic continuous test by detecting broken pieces adhering to a gripping face of a chuck after the broken pieces are recovered and forcedly pushing the detected pieces out of the chuck and recovering them. CONSTITUTION:In the case a test specimen is broken in a range out of a grip of an automatic hand apparatus 4, though a broken piece 1b can be recovered by the gripping arm 4b, a broken piece 1a can not be recovered by an arm 4a. When chucking apparatuses 2, 3 are opened under the condition, a broken piece 1a falls in a broken piece recovering box 5 and on the other hand, a broken piece la between chucks 2a, 2b does not fall and adheres to the gripping face of one chuck, for example the chuck 2a. The adhering position is detected by broken piece detecting apparatuses 9a-9d buried in the chucks 2, 3. After the adhering position is detected, a scraping cylinder having a pushing jigs at the tip is started driving and pushes the jig between the chucks 2a, 2b to drop a broken pieces 1a. Consequently, the automated degree is heightened and the test efficiency can be improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a continuous tensile test method for round steel such as wire rods, and more specifically, in a tensile test process in which automatic processing is continuously performed from supply of a test piece to recovery of broken fragments after the test. The present invention relates to a method for treating broken fragments remaining in the chuck.

[0002]

2. Description of the Related Art For example, in a tensile test for determining a tensile strength and an elongation value of a wire rod, a test piece is cut from a coiled wire rod product to a predetermined length, and the shape of the test piece is determined by mechanical processing by secondary processing. In order to avoid changes in properties, the sampled shape is measured and numbered and set in the tester.

The test piece chucked in the tester is set with an elongation measuring device and then loaded with a tensile load.
Eventually it will break. As for the method of recovering the broken pieces, the broken pieces are grasped in a pair in an upper and lower direction by an automatic hand device or the like, removed from the main body of the testing machine, and automatically collected into a broken piece conveyor or a storage box adjacent to the testing machine body. As a publicly known example, Japanese Patent Publication Sho 5
There is an example of automatic unloading of a fragment disclosed in Japanese Patent Laid-Open No. 22222/1990.

[0004]

In the tensile test of steel materials, in addition to measurement and control of load and strain, an automatic hand device is introduced for chucking set of test pieces and recovery of broken pieces,
From the supply of test pieces to the processing of test values, continuous automatic tensile testing is performed. In particular, in the tensile test of a steel plate, since the parallel part is machined in the central part of the test piece, the breaking position is limited to the central part, and the broken fragments can be easily collected by the automatic hand device.

However, since the parallel test piece is not machined on the test piece for round steel such as a wire rod, there is a problem that the breaking position is arbitrarily changed between the upper and lower chucks of the tester. That is, in the collection of broken pieces, when the breaking position is within the grip range of the auto hand, the pair of broken fragments are collected in a state where they can be abutted, but when the breaking position is outside the grip range of the auto hand, the long side Only the broken pieces of No. 2 are collected by the auto hand, and the short side cannot be grasped by the auto hand. Therefore, when the chuck is opened, it is dropped and collected in the box provided at the bottom of the tester.

At this time, since the broken pieces on the short side are subjected to a strong chucking force during the tensile test, they often stick to the chuck gripping surface and remain in the chuck despite the opening operation of the chuck. Occurs and the continuous automatic test is interrupted. The result is operator intervention,
Since the automation rate and the test efficiency are reduced, the function of reliably ejecting the broken pieces from the chuck is required.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in order to advantageously solve the above-mentioned problems of the prior art, in which a pre-test specimen is set on a chuck portion of a tensile tester and a post-test breakage is performed. In the continuous automatic tensile test method for round steel in which fragments are collected by an auto hand, the test piece breaks at a position where it can be collected by an auto hand, and even after the chuck opening operation, fragments are stuck to the chuck gripping surface. In this case, it is a continuous automatic tensile test method for round steel, characterized in that the broken pieces are detected, and the broken pieces are forcibly pushed out of the chuck by the detection signal and collected.

[0008]

In other words, the broken pieces are grasped by the automatic hand device in the broken piece collecting step, transferred to the outside of the testing machine, and then the presence or absence of residual breakage in the chuck is automatically detected. The method is a detector embedded in the position where the test piece is gripped by a pair of chucks on the top, bottom, left, and right.After the transfer of the fragment by the auto hand device is completed, the output signal of the detector is checked and the fragment remains on the top, bottom, left, or right. If is detected, the start instruction is given to the residual fragment extruding device, which is independently installed on the back surfaces of the upper and lower chucks.

The pushing device pushes a jig, which is slightly smaller than the chuck opening distance, between the left and right chucks in the opened chuck state to drop the broken pieces adhered to the chuck gripping surface. As a result, when the residual fragment detection signal in the chuck detects "no residue", the fragment recovery step is completed, and the work of the next step is automatically advanced.

[0010]

Embodiments of the present invention will be described in detail with reference to the following drawings.

FIG. 1 is a flow chart showing an automatic process in a continuous automatic tensile test of a round steel such as a wire rod from the detection of the fracture of the test piece due to the load of the tensile load to the collection of the fractured piece to the reception of the next test piece.

FIGS. 2 (a) and 2 (b) are explanatory views of fragment breakage when the break position of the test piece breaks within the gripping range of the automatic hand device, and FIG. 2 (a) shows the fragment "1a". And “1b” are gripped by the upper automatic hand gripping arm “4a” and the lower automatic hand gripping “4b” of the automatic hand device “4”, and the chuck “2” of the upper chucking device “2”.
a ”, the chuck“ 2b ”, and the chuck“ 3a ”and the chuck“ 3b ”of the lower chucking device“ 3 ”are completed, and the state of being unloaded from the load part of the testing machine is illustrated in FIG. (B) is a state in which the postures of the fragments “1a” and “1b” are vertically and horizontally rotated by the automatic hand device “4” and transferred to the fragment recovery conveyor “6” adjacent to the tester body. It is a figure which illustrates.

FIGS. 3 (a) and 3 (b) are explanatory views of broken fragment recovery when the breaking position of the test piece is broken outside the gripping range of the automatic hand device "4".

In the state of FIG. 3 (a), the fragment "1b" is recovered by the gripping arm "4b" of the automatic hand device "4", but the fragment "1a" is chucked with "2a" and "2a". 2b "
Due to the breakage in the inside, the automatic hand device "4" cannot hold the automatic hand holding arm "4a". When the upper chucking device "2" and the lower chucking device "3" are opened in this state, the fragment "1a" supported by the upper chucking device "2" falls,
The fragments are collected in the fragment collection box "5" provided below, and after the automatic processing is completed, they are matched with the other fragment "1b".

FIG. 3B shows the broken pieces "1a" in the chucks "2a" and "2b" even when the chucking devices "2" and "3" are opened in the above-mentioned broken piece collecting process. FIG. 11 is a state diagram in which the object is fixed to one side of the chuck of the upper chucking device “2”, that is, the grip surface of the chuck “2a” without falling. At this time, the presence or absence of sticking is detected by the broken fragment detectors “9a”, “9b”, “9c” or “9d” embedded in each chuck, and if sticking is present, an extrusion processing signal is output.

FIG. 4 is a plan view showing a state in which a broken piece adhered to the gripping surface of the chuck "2a" on one side of the upper chucking device "2" is pushed out. That is, the broken cylinder "1a" adhering to the V-shaped yard machined on the gripping surface of the chuck is activated from the back of the chuck by activating the dispensing cylinder "8" with the extruding jig "7" attached to the tip. By pushing in between the gap between "2a" and chuck "2b",
It is intended to fall. The pay-out cylinder "8" is automatically moved backward after advancing in a constant stroke. In this state, the remaining fragments are confirmed again by the fragment detectors "9a", "9b", "9C" or "9d". As a result, 4
After detecting that there is no fragment remaining in each detector,
The test piece is stepped up to the next state of accepting the test piece and the tensile test is continuously and automatically performed.

[0017]

As described above, the present invention incorporates a step of forcibly withdrawing the broken pieces after the step of collecting the broken pieces by a tensile test, and further detecting the presence or absence of the pieces in the chuck. As a result, a continuous automatic tensile test method for round steel with a high degree of automation has been established.

[Brief description of drawings]

FIG. 1 is a flow chart of a method for recovering broken fragments in a tensile test according to the present invention.

FIG. 2A is a test piece recovery state diagram when the test piece is broken within the gripping range of the automatic hand device. (B) is a state diagram in which the pair of recovered fragments are transferred onto the conveyor.

FIG. 3A is a test piece recovery state diagram when the test piece is broken outside the grip range of the automatic hand device. (B) is a state diagram in which one of the fragments remains on the chuck grip surface.

FIG. 4 is an explanatory view of an apparatus that enables the broken fragment recovery method of the present invention to discharge the test piece remaining on the chuck gripping surface to the outside of the chuck.

[Explanation of symbols]

 1a One of the fragments after the tensile test 1b The other of the fragments after the tensile test 2 Upper chucking device 2a Upper chucking device chuck 2b Upper chucking device chuck 3 Lower chucking device 3a Lower chucking device Chuck 3b Chuck of lower chucking device 4 Auto hand device 4a Auto hand gripping arm 4b Auto hand gripping arm 5 Fragment fragment collection box 6 Fragment fragment arrangement conveyor 7 Chuck residual fragment fragment dispensing cylinder 8 Chuck residual fragment fragment dispensing cylinder 9a Upper And lower chuck in-fragment fragment residual detector 9b Upper and lower chuck in-fragment fragment residual detector 9c Upper and lower chuck in-fragment fragment residual detector 9d Upper and lower chuck in-fragment fragment residual detector 9d

Claims (1)

[Claims] 1. In a continuous automatic tensile test method for round steel in which a test piece before test is set on a chuck portion of a tensile tester and a fragment after test is collected by an auto hand, the test piece can be collected by the auto hand. If the broken piece is broken at a certain position, and the broken piece is stuck to the chuck gripping surface even after the chuck is opened, the broken piece is detected and the broken piece is forced out of the chuck by the detection signal. A continuous automatic tensile test method for round steel, characterized by recovering.