SK2382020U1 - Jig for measuring mechanical properties of welded joint in tearing machine - Google Patents

Abstract

Described is a device for measuring the mechanical properties of a welded joint in a shredding machine comprising a shear (11), a shear (5) and a replaceable shear (6), the shear (11) comprising a detachably connected base (7), a lid (8) connecting the cutter (11) to the drawbar (1) of the tearing machine, the base (7) comprising a groove (13) for the cutter (5), the lid (8) comprising an opening (15) for the cutting machine (6) and an opening (15) for the shear (6) corresponds to the fixing element (3) of the shear (6), the shear (5) being slidably mounted in the shear (11), comprising a shear edge (21) formed in the groove (20) for inserting the sample (12) and means for connecting the cutter (5) to the drawbar (1) of the tearing machine, and the replaceable cutter (6) comprises a recess (23) on the sample (12) and a cutting edge (22) which corresponds to the cutting edge (21) of the cutter (5).

Description

Technical field

This technical solution concerns the field of measuring the mechanical properties of a welded joint.

Prior art

The welded joint consists of three basic parts - the basic material, the heat-affected zone and the weld metal. The technological conditions of the welding process affect its properties, therefore it is necessary to determine them. At present, a tensile test of a welded joint is performed, and usually, in the case of its high-quality design, a failure occurs in the area of the basic material - a technological test is performed. However, this does not say anything about the influence of the technological conditions of the welding process on the properties of individual parts of the joint, for which a test of its mechanical properties is required.

The aim of this technical solution is therefore to design a device that can measure the shear strength of the welded joint at any point - in the base material, the heat-affected area and in the weld metal in the case of a butt joint.

The essence of the technical solution

This object is achieved by a device for measuring the mechanical properties of a welded joint in a shredding machine according to. The essence of the device according to this technical solution lies in that it comprises a cutter, a cutter and a replaceable cutter, the cutter comprising a releasably connected base, a lid and means for connecting the cutter to a drawbar of a tearing machine, the base comprising a groove for a cutter; the cutting element and the cutting element fixing element correspond to the cutting hole. The cutter is slidably mounted in the cutter, comprising a cutting edge formed in the groove for inserting the test sample and means for connecting the cutter to the drawbar of the tearing machine. The interchangeable cutter includes a recess for the test specimen and a cutting edge that corresponds to the cutting edge of the cutter.

To ensure loading of the test specimen in one axis, the means for connecting the shear to the drawbar of the tearing machine are formed by a cross joint at one end thereof connected to a fixing pin which is threaded through a hole in the base and lid of the shear and at the other end connected to the drawbar of the tear machine, and the means for connecting the cutter to one drawbar of the tearing machine are formed by a cross joint at one end thereof connected to a fixing pin which is threaded through an opening in the cutter and at the other end connected to the other drawbar of the tearing machine.

Overview of figures in the drawings

The technical solution is also explained in the attached drawings, which show:

FIG. 1 is a cross-sectional side view of a jig fixed to the drawbars;

FIG. 2 is a top view of the device of FIG. 1;

FIG. 3 is a top view of the base of the cutter;

FIG. 4 is a section through the base of the cutter along the plane A-A of FIG. 3;

FIG. 5 is a section through the base of the cutter along the plane C-C of FIG. 3;

FIG. 6 is a top view of the cutter lid;

FIG. 7 is a cross-sectional side view of the cutter lid of FIG. 6;

FIG. 8 is a top view of the cutter;

FIG. 9 is a side view of the cutter of FIG. 8;

FIG. 10 is a top view of the die;

FIG. 11 is a cross-sectional side view of the die of FIG. 10;

FIG. 12 is a detailed cross-sectional side view of a cutting portion of a jig with an inserted test specimen with a butt weld prior to cutting;

FIG. 13 is a view from FIG. 12 after cutting the test sample;

FIG. 14 is a detailed cross-sectional side view of a cutting portion of a preparation with a test specimen inserted with an interleaved weld before cutting;

FIG. 15 is a view from FIG. 14 after cutting the test sample.

SK 238-2020 U1

Examples of embodiments

The device, according to this technical solution, according to FIG. 1 to 11, for measuring the mechanical properties of a welded joint in a shredding machine, comprises three main parts: a cutter (11) which ensures clamping of the test specimen (12) with a welded joint, also clamping of a shear (6) and shear guide (5), shear (5) and a cutting machine (6).

The cutter (11) comprises a base (7), which is shown separately in FIG. 3 to 5, and the lid (8), which is shown separately in FIG. 6 and 7.

The base (7) of the cutter (11) comprises a groove (13) for the cutter (5) and a hole (14) for the fixing pin (9).

The lid (8) of the cutter (11) comprises an opening (15) for the cutting tool (6) and an opening (14) for the fastening pin (9). The opening (15) for the die (6) has a larger dimension in the transverse direction of the groove (13) for the die (5) than the width of this groove (13). A stirrup (4) of the fixing element (3) of the cutting tool (6) is located above the opening (15) for the cutting tool (6). In the example shown, the stirrup (4) is preferably fastened to the lid (8) with screws. The fixing element (3), which in the illustrated example is cylindrical in shape, corresponds to the opening (15) for the die (6) and in the illustrated example is fixed from the stirrup (4) by a fixing screw (16).

The base (7) and the lid (8) are detachably connected to each other, preferably by screw connections, as shown in the figures. The base (7) serves to guide the cutter (5) in the axial direction and the lid (8) serves to define the cutting clearance, which can be adjusted by washers (not shown in the figures) of suitable dimensions between the base (7) and the lid (8). The lid (8) also serves to place the cutting tool (6).

The cutter (5) shown in FIG. 8 and 9, comprises a shank (17) and a holder (18) with an opening (19) for a fixing pin (10). The shank (17) of the cutter (5) corresponds to the groove (13) in the base (7) of the cutter (11), and comprises a cutting edge (21) formed, for example, by a milled groove (20). The groove (20) simultaneously serves to accommodate one part of the test specimen (12) with a welded joint.

The die (6) shown in FIG. 10 and 11, is a replaceable body which corresponds in shape and size to the opening (15) for the cutting machine (6) in the lid (8) of the cutting machine (11). A recess (23) is formed in the shear (6) for the test sample (12) and a shear edge (22) which corresponds to the shear edge (21) of the shear (5). The die (6) can have different thicknesses, which makes it possible to use test specimens (12) of different dimensions. The selection of the size of the test specimen (12) with a welded joint and its sampling allows the placement of the shear plane at the desired location of the test specimen (12). The cutting die (6) is placed in the opening (15) of the lid (8), where in this opening (15) it is fixed by means of a fixing element (3) fixed by a stirrup (4) with a fixing screw (16).

When measuring the mechanical properties of a welded joint using a jig according to this technical solution, as shown in FIG. 12 to 15, the test sample (12) with a welded joint is inserted through the opening (15) of the lid (8) and the recess (23) in the inserted die (6) so as to reach the bottom of the groove (20) in the die (5). The position of the test specimen (12) with the cutting plane at the desired location of the specimen (12) is fixed by means of a fixing element (3) and a stirrup (4) which also serves to fix the shear (6). The dimension of the test specimen (12) with a welded joint is given by the distance between the bottom of the groove (20) in the cutter (5) and the face of the fixing element (3).

The whole jig is placed in a shredding machine by means of cross joints (2) and drawbars (1), which serves for derivation and at the same time we measure the pulling force and measure the displacements. The universal joints (2) ensure loading in one axis.

As shown in FIG. 1 and 2, at one end the jig is connected to the joint (2) by means of a pin (9) passed through an opening (14) for the pin (9) in the base (7) and the lid (8) of the cutter (11). This pin (9) transmits the force exerted by the tearing machine in one direction. At the other end, the jig is connected to the joint (2) by means of a pin (10) passed through a hole (19) for the pin (10) in the cutter (5). This pin (10) transmits the force exerted by the tearing machine in the second direction. The displacement, shearing, on the sample (12) which occurs under the action of opposite forces exerted by the tearing machine on the one hand on the cutter (11) and on the other hand on the cutter (3) is shown in FIG. 12 to 15 shown by an arrow. In this case, FIG. 12 and 13 together show a shearing diagram of a butt weld in the area of the weld metal, and FIG. 14 and 15 together show a shearing diagram of an interleaved weld.

Claims (2)

CLAIMS FOR PROTECTION A device for measuring the mechanical properties of a welded joint in a shredding machine, characterized in that it comprises a shear (11), a shear (5) and a replaceable shear (6), wherein the shear (11) comprises 5 detachably connected base (7), a lid (8) and means for connecting the cutter (11) to the drawbar (1) of the tearing machine, the base (7) comprising a groove (13) for the cutter (5), the lid (8) comprising an opening (15) for the cutter (6) ) and with the opening (15) for the cutter (6) corresponds to the fixing element (3) of the cutter (6), the cutter (5) being slidably mounted in the cutter (11), comprising a cutting edge (21) formed in the groove (20) samples (12) and means for connecting the cutter (5) to the drawbar (1) of the shredding machine, 10 and the exchangeable cutter (6) comprises a recess (23) for the test sample (12) and a cutting edge (22) which corresponds to the cutting edge (21) of the cutter (5). Device according to claim 1, characterized in that the means for connecting the cutter (11) to the drawbar (1) of the tearing machine are formed by a cross joint (2) at one end thereof connected to a fixing pin (9) which is threaded over an opening (14) in the base (7) and lid (8) of the cutter (11) 15 and at its other end connected to one drawbar (1) of the tearing machine, and means for connecting the cutter (5) to the drawbar (1) of the tear-off machines are formed by a cross joint (2) at one end thereof connected to a fixing pin (10), which is passed through an opening (19) in the cutter (5) and at the other end thereof connected to the second drawbar (1) of the tearing machine.