JP2017094357A - Shear testing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a shear testing device suitable for evaluating shear processing, in a forging device for cutting a raw material by shear, by continuously supplying the raw material.SOLUTION: A testing device of shear processing of a raw material on a forging device for forging-molding a shear-processed material after shear-processing the continuously- supplied raw material, is a shear testing device 1 having a single-shot type press machine 10, a fixed blade part 20 for supporting the raw material M and a movable blade part 30 displaceably provided by pressure of the single-shot type press machine 10 from an original position being coaxial with the fixed blade part 20.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a shear test apparatus used for evaluating shearing of a material.

  A continuous forging device that cuts a continuously supplied material into a predetermined length and shapes the cut material by forging is known (for example, see Patent Document 1 below).

  In such a continuous forging device, when the material is cut by shearing, the cut surface may be roughened or cracked. Such problems need to be improved because they lead to defects in forged products. In the forging device in which the cutting process by shearing and the forging process are integrated, since the cutting process and the forging process are systematically executed, only the cutting process is evaluated using the forging apparatus itself. Is difficult.

JP 2005-262231 A

  The problem to be solved by the present invention is to provide a shear test apparatus suitable for evaluating the shearing process in a forging device in which the material is continuously supplied and the material is cut by shearing. .

  In order to solve the above-described problems, a shear test apparatus according to the present invention is a shear test apparatus for a raw material for a forging apparatus that forge-molds the shear-processed material after shearing the continuously supplied material. A single-press machine, a fixed blade portion that supports the material, and a movable blade portion that is displaceable by the pressure of the single-press machine from an original position that is coaxial with the fixed blade portion. It is characterized by providing.

  By using the test apparatus as described above, it is possible to easily perform the cutting evaluation by shearing the forging supply material.

  It is a shearing test apparatus for the forging device to which the material in the form of a coil is continuously supplied, and it is preferable to include a tensile force applying means for applying a tensile force to the material.

  The tensile force applying means is provided so as to sandwich the moving blade portion with the fixed blade portion, and the material connecting portion connected to the material and the moving blade portion are displaced, whereby the material connection It is good to have a tension | tensile_strength provision part which displaces a part in the direction away from the said fixed blade part.

  In a forging device in which a coil-shaped material is continuously supplied, there is a possibility that distortion occurs because the material is wound in a coil shape when the material is cut. Since the strain is generated as a tensile force on the material, a coiled material can be continuously supplied by using a test apparatus equipped with a tensile force applying means as described above to indicate the state of cutting of the material by the test apparatus. It is possible to approach the cutting state of the material in the forging device.

  The shear test apparatus in the present invention is suitable for evaluating the shearing process in a forging apparatus in which a material is continuously supplied and the material is cut by shear.

It is the figure which showed typically the state where the movable blade part of the shear test apparatus concerning one Embodiment of this invention is located in an original position, Comprising: (a) is the figure seen from the direction orthogonal to an axial direction ( (Partial cross-sectional views) and (b) are views seen from the axial direction. It is the figure which showed typically the state which the movable blade part of the shear test apparatus concerning one Embodiment of this invention displaced downward from the original position, Comprising: (a) is the figure seen from the direction orthogonal to an axial direction ( (Partial cross-sectional views) and (b) are views seen from the axial direction. It is a figure for demonstrating the well-known forging apparatus with which the cutting process and forging process by a shear are performed continuously.

  Hereinafter, a shear test apparatus 1 (hereinafter also simply referred to as a test apparatus 1) according to an embodiment of the present invention will be described in detail. The test apparatus 1 according to the present embodiment includes a forging apparatus that forges the sheared material (hereinafter also referred to as a base material) after shearing the continuously supplied material. This is a device for evaluating and examining whether shearing is suitable for forging.

  First, a known forging device 100 that is an evaluation object by the test apparatus 1 according to the present embodiment will be briefly described with reference to FIG. The forging device 100 cuts a metal elongated material M (linear material) continuously supplied by shearing to obtain a base material M1 having a predetermined length, and the obtained base material M1. The forging process 120 for obtaining the product P by forming into a desired form by forging is continuously performed. The material M is continuously supplied toward the cutting step 110 while the material wound in a coil shape is straightened. In this specification, unless otherwise specified, not only the apparatus 100a that performs the cutting process 110 and the forging process 120 but also the apparatus 100b that maintains the material M (raw material) in a coil shape. Is defined as “forging device”. In such a forging device 100, the cutting step 110 and the forging step 120 are continuously executed (systemized so that the base material M1 obtained by cutting the material M is immediately sent to the forging step 120). Therefore, it is difficult to carry out the cutting evaluation of the material M by extracting only the cutting step 110. Therefore, the test apparatus 1 in this embodiment is effective.

  The test apparatus 1 according to the present embodiment shown in FIGS. 1 and 2 includes a single-shot press 10, a fixed blade part 20, a movable blade part 30, and a tensile force applying means 40. Each configuration will be described below. In addition, the up-down direction in the following description refers to a direction along the direction of pressure exerted by the single-press machine 10 (the pressure application direction is down), and the axial direction (longitudinal direction) refers to the material M. The direction along the axial direction shall be said.

  The single-shot press 10 is a known device that performs a pressing process (pressing action) in only one process. Any operation method may be used. A mechanical press such as a crank press may be used, or a hydraulic press using hydraulic pressure or the like may be used.

  The fixed blade portion 20 is for cutting the material M by shearing in cooperation with the movable blade portion 30, and is fixed directly or indirectly to the base of the single shot press 10. In other words, the fixed blade portion 20 does not change the relative position with respect to the single shot press 10. The fixed blade portion 20 is a cylindrical member in which a space (hereinafter also referred to as a fixed-side space 21) in which the material M can be inserted is formed at the center. Since the material M in the present embodiment is a metal material having a circular cross section, the shape of the fixed side space 21 is also a circular cross section. When the material M is inserted into the fixed side space 21, it is desirable to make the gap (backlash) between the inner wall surface facing the fixed side space 21 of the fixed blade portion 20 and the outer peripheral surface of the material M as small as possible.

  Similar to the fixed blade portion 20, the movable blade portion 30 is a cylindrical member in which a space into which the material M can be inserted (hereinafter also referred to as a movement-side space 31) is formed. Since the raw material M in the present embodiment is a metal material having a circular cross section, the shape of the moving side space 31 is also a circular cross section. When the material M is inserted into the moving side space 31, it is desirable that the gap (backlash) between the inner wall surface facing the moving side space 31 of the moving blade portion 30 and the outer peripheral surface of the material M is as small as possible.

  The movable blade portions 30 are aligned in the axial direction so that the fixed blade portion 20 and the central axis (the central axes of the fixed side space 21 and the movable side space 31) coincide with each other at the original position. That is, in a state where the moving blade portion 30 is located at the original position, the fixed side space 21 and the moving side space 31 constitute a continuous and elongated space. The material M as the test piece is set so as to straddle the fixed side space 21 and the moving side space 31. Further, a clearance for cutting can be appropriately set between the fixed blade portion 20 and the movable blade portion 30.

  The moving blade part 30 is displaced downward by the pressure of the one-shot press 10 (see FIG. 2). The slide of the single press 10 and the moving blade part 30 may be connected directly or indirectly, and when the slide is lowered, the slide comes into contact with the moving blade part 30, and the force is transmitted to the moving blade part 30. It may be configured as follows. That is, as long as the power of the single press 10 (slide) is transmitted to the movable blade portion 30, the power transmission structure may be any.

  The tensile force applying means 40 includes a material connecting portion 41 and a tensile force applying portion 42. The material connection part 41 is a member connected to the material M as a test piece. The material connecting portion 41 is provided so as to sandwich the movable blade portion 30 located at the original position between the material connecting portion 41 and the fixed blade portion 20 in the axial direction. That is, when viewed from the fixed blade portion 20 side in the axial direction, the fixed blade portion 20, the movable blade portion 30, and the material connecting portion 41 are arranged in this order. Note that a tensile force applying unit 42 described later is positioned between the movable blade unit 30 and the material connecting unit 41. The material connecting portion 41 is connected to a part of the material M on the moving blade portion 30 side. Any connection structure may be used for the material M of the material connection portion 41. In this embodiment, a part of the front end side of the raw material M is protruded from the movable blade part 30 (opening on the opposite side of the movable blade part 30 on the fixed blade part 20 side), and a male screw is formed in the protruded part. The material connecting portion 41 is formed with a female screw that can be screwed into the male screw. The material connection portion 41 and the material M are integrated by screwing the male screw and the female screw.

  The material connecting portion 41 has an inclined surface that is inclined so as to be separated from the fixed blade portion 20 and the movable blade portion 30 from the upper side to the lower side (hereinafter referred to as a first inclined surface 411 to be distinguished from a second inclined surface 421 described later). Is formed. The inclination angle of the first inclined surface 411 is set to be the same as the second inclined surface 421 described later.

  The tensile force imparting portion 42 is a member for displacing the material connecting portion 41 in a direction away from the fixed blade portion 20 when the movable blade portion 30 moves. The movable blade portion 30 in the present embodiment is formed with an inclined surface that is inclined so as to be separated from the fixed blade portion 20 from the upper side to the lower side (hereinafter referred to as the second inclined surface 421 to be distinguished from the first inclined surface 411). It is a member. In the present embodiment, the tensile force imparting portion 42 is installed between the movable blade portion 30 and the material connecting portion 41 in the axial direction. The tensile force imparting part 42 is fixed directly or indirectly to the single-shot press 10 so as not to change its position.

  As described above, the inclination angle of the second inclined surface 421 is the same as that of the first inclined surface 411. The first inclined surface 411 of the material connecting portion 41 and the second inclined surface 421 of the tensile force applying portion 42 are in close contact. As will be described in detail later, the inclination angles of both inclined surfaces are factors that determine the magnitude of the tensile force applied to the material M. Moreover, since the 2nd inclined surface 421 slides on the 2nd inclined surface 421 when the movable blade part 30 is displaced, it is desirable to make the frictional resistance between both surfaces as small as possible.

  Hereinafter, the operation (shear test method) of the test apparatus 1 configured as described above will be described in detail although it partially overlaps with the above description. First, the material M as a test piece is set in a state where the movable blade portion 30 is located at the original position (see FIG. 1). That is, the material M is set so as to straddle the fixed side space 21 and the moving side space 31. A male thread portion is formed in advance on the material M, and the material screw portion is screwed into the male thread portion, whereby the material connection portion 41 is connected to the material M. The material connecting portion 41 is set at a position where the first inclined surface 411 is in close contact with the second inclined surface 421 of the tensile force imparting portion 42 that is directly or indirectly fixed to the one-shot press 10.

  In this state, the single press 10 is driven, and the moving blade 30 is displaced downward by the pressure. Thereby, a shearing force is generated between the fixed blade portion 20 and the movable blade portion 30, and the material M is cut at the boundary between the fixed blade portion 20 and the movable blade portion 30 (see FIG. 2). By changing the slide lowering speed of the single press 10, the cutting speed (the moving blade 30 lowering speed) can be adjusted. Moreover, you may enable it to measure the load at the time of a cutting | disconnection by a load measurement means (for example, load cell etc.).

  That the movable blade part 30 is displaced downward means that the material connecting part 41 connected to the movable blade part 30 side of the material M is also displaced downward together with the movable blade part 30. In other words, the downward displacement of the movable blade portion 30 is transmitted to the material connecting portion 41 via the material M. And the raw material connection part 41 has made the 1st inclined surface 411 closely_contact | adhere to the 2nd inclined surface 421 of the tension | tensile_strength provision part 42, and the said inclined surface goes to the direction away from the fixed blade part 20 from upper direction to the downward direction. Since it inclines, the raw material connection part 41 is displaced in the direction away from the fixed blade part 20 (refer FIG. 2). That is, the material connecting portion 41 is displaced in the direction away from the fixed blade portion 20 (diagonally downward) while being displaced downward. Since the material M is connected to the material connecting portion 41, a tensile force acts on the material M during cutting by the material connecting portion 41 thus displaced. The tensile force increases as the inclination angle of the first inclined surface 411 and the second inclined surface 421 with respect to the vertical direction (vertical direction) is increased. In this embodiment, the inclination angle of the first inclined surface 411 and the second inclined surface 421 is set to 30 degrees.

  The reason for applying the tensile force to the material M in this way is as follows. The test apparatus 1 according to the present embodiment assumes a forging apparatus in which a material M wound in a coil shape is continuously supplied to a cutting process. The material M wound in a coil shape is corrected in a straight line. However, if the strain caused by being wound in the coil shape remains, the material M tends to bend at the time of cutting due to the strain. The test apparatus 1 according to the present embodiment can approximate the state in which the strain remains by applying a tensile force to the material M at the time of cutting.

  Therefore, even if the material M supplied to the cutting process is not wound in a coil shape, or is wound in a coil shape, the forging device is considered to be able to remove strain by straightening straightening. In this test, the test apparatus 1 that is not provided with the tensile force applying means 40 as described above may be used. That is, it can be said that the tensile force imparting means 40 of the test apparatus 1 according to the present embodiment is intended for the forging apparatus (forging apparatus 100 as shown in FIG. 3) in which the material M is wound in a coil shape.

  According to the test apparatus 1 concerning this embodiment demonstrated above, evaluation of the cutting process by the shearing of the raw material M supplied to a forge process becomes easy.

  Moreover, since the test apparatus 1 according to the present embodiment includes the tensile force applying means 40 as described above, the coiled material M continuously supplies the cutting state of the material M by the test apparatus 1. It is possible to approach the state of cutting of the material M in the forging device to be performed.

  As mentioned above, although embodiment of this invention was described in detail, this invention is not limited to the said embodiment at all, A various change is possible in the range which does not deviate from the summary of this invention.

DESCRIPTION OF SYMBOLS 1 Shear testing apparatus 10 Single shot type press 20 Fixed blade part 21 Fixed side space 30 Moving blade part 31 Moving side part 40 Tensile force provision means 41 Material connection part 411 First inclined surface 42 Tensile force provision part 421 Second inclined surface M Material

Claims (3)

A shearing test apparatus for a forging device for forging a material that is continuously fed and then forging the sheared material,
Single-press machine,
A fixed blade portion for supporting the material;
A movable blade provided to be displaceable by the pressure of the one-shot press from an original position coaxial with the fixed blade,
A shear test apparatus comprising: A shearing test device for the forging device to which the coiled material is continuously supplied,
The shear test apparatus according to claim 1, further comprising a tensile force applying unit that applies a tensile force to the material. The tensile force applying means is
A material connecting part that is provided so as to sandwich the movable blade part between the fixed blade part and fixed to the material;
A tensile force imparting part that displaces the material connection part in a direction away from the fixed blade part by displacing the moving blade part,
The shear test apparatus according to claim 2, wherein

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