A fixture device and method for machining a notch of an impact specimen

Abstract

The present invention relates to a fixture device for processing a notch of an impact specimen, comprising a uniform height iron (1) and a vise (2) arranged on both sides of the uniform height iron (1), wherein the jaws (21) of the vise (2) on each side are provided with a pair of rectangular notches (211) and a V-shaped notch (212), wherein the rectangular notch (211) comprises a first notch (211a) and a second notch (211b), which are respectively arranged on both sides of the V-shaped notch (212), wherein the distance from the V-shaped notch (212) to the first notch (211a) is 27.5 mm, and the distance between the two rectangular notches (211) is ≥55 cm; and a pair of mutually parallel sliding baffles (3) are connected to the uniform height iron (1), wherein the sliding baffles (3) are arranged parallel to the rectangular notch (211). The advantages of the present invention are that a plurality of specimens can be processed quickly and accurately, the notch size is accurate, the specimen smoothness is high, the quality of the notch of the impact specimen is improved, and the test efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of material testing equipment, in particular to a fixture device and a method for machining a notch of an impact specimen. Background Art

[0002] Impact toughness refers to the ability of a material to absorb plastic deformation work and fracture work under impact load. It reflects the subtle defects and impact resistance of the material. It reflects the resistance of metal materials to external impact loads. It is generally expressed by the impact toughness value ak and impact work Ak, and its units are J / cm 2 and J. Factors that affect the impact toughness of steel include the chemical composition of the material, heat treatment state, smelting method, inherent defects, processing technology and ambient temperature. For samples of the same material, the deeper and sharper the notch, the greater the stress concentration at the notch, the easier it is to deform and break, the smaller the impact energy, and the higher the brittleness of the material. In recent years, for materials of important structures, there is a tendency to use V-notch specimens that can better reflect the notch effect for impact testing.

[0003] The original broach-type notching equipment can only process the notch of one specimen at a time, which is inefficient; the depths of the upper and lower ends of the notch of the processed specimen are inconsistent, with a difference of 0.01~0.02mm; at the same time, there are burrs at the lower end of the notch, which need to be manually smoothed before the impact test can be carried out, which prolongs the processing time of the notch, is time-consuming and labor-intensive, and affects the progress of the test. Summary of the invention

[0004] The purpose of the present invention is to solve the problems of low efficiency, insufficient notch depth accuracy and insufficient smoothness of existing broach-type notch equipment, and to provide a fixture device for processing impact specimen notches, which can quickly and accurately process multiple specimens with precise notch dimensions and high specimen smoothness, thereby improving the quality of the impact specimen notch and the test efficiency.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A fixture device for processing a notch of an impact specimen, comprising a height iron and a bench vise arranged on both sides of the height iron, wherein the jaws of the bench vise on each side are provided with a pair of rectangular notches and a V-shaped notch, wherein the rectangular notch comprises a first notch and a second notch, which are respectively arranged on both sides of the V-shaped notch, wherein the distance from the V-shaped notch to the first notch is 27.5 mm, and the distance between the two rectangular notches is ≥55 mm;

[0007] A pair of mutually parallel sliding baffles are connected to the equal-height iron, and the sliding baffles are arranged parallel to the rectangular notch to fix the sample.

[0008] Furthermore, the width of the rectangular notch is 3-5 mm.

[0009] Furthermore, the V-notch shape and size standards refer to the standard requirements for the V-notch of the Charpy impact specimen.

[0010] Furthermore, the hardness of the jaws is HV>400.

[0011] Furthermore, the sliding baffle is connected to the high-speed rail through sliding bolts.

[0012] Furthermore, the height of the sliding baffle beyond the equal-height railway is 2-5 mm.

[0013] In order to further achieve the purpose of the present invention, a method for processing a notch of an impact specimen is also provided, and the specific steps are as follows, including:

[0014] (1) Improve the bench vise and the height-contact iron as required, and install the improved bench vise and the height-contact iron on the horizontal milling machine;

[0015] (2) Place the specimens to be notched side by side on equal height rails. The length of the specimens is 55 mm and the width is 10 mm. Each specimen is placed perpendicular to the sliding baffle and fixed with the sliding baffle.

[0016] (3) Align the V-notch of the jaws with the cutting edge of the horizontal milling machine, ensuring that the distance between the V-notch and one end of the specimen in the length direction is 27.5 mm to ensure the accuracy of the notch position of the impact specimen;

[0017] (4) Adjust the height of the equal-height iron so that the distance between the bottom of the V-notch and the lower surface of the specimen is 8 mm to ensure the accuracy of the notch depth;

[0018] (5) Start the equipment, and the milling cutter can complete the notch processing of a row of samples at one time. After the processing is completed, turn off the horizontal milling machine and replace the samples that need to be processed with notches until all the processing is completed.

[0019] Compared with the prior art, the advantages of the technical solution of the present invention are:

[0020] (1) The present invention is a fixture device for quickly and accurately processing the notch of an impact specimen. The existing bench vise and isobar of a horizontal milling machine are used. Only minor improvements need to be made to the jaws and isobar. The device is easy to load, unload and replace during processing. There is no need to modify existing processing equipment, thereby improving processing test efficiency and test accuracy and saving costs.

[0021] (2) Improve the jaws and process a V-shaped notch of the same size as the Charpy impact specimen to meet the precision requirements of the notch processing size;

[0022] (3) Add a sliding baffle on the equal height iron to fix the sample and ensure the position of the sample when it is placed, so as to meet the accuracy of the position of the sample notch;

[0023] (4) Multiple specimens can be processed at one time, improving specimen processing efficiency;

[0024] (5) The height of the sliding baffle beyond the equal height iron is less than 5mm to meet the processing requirements of specimens of different sizes, such as 5×10mm, 7.5×10mm, and 10×10mm. The height above 2mm is to better fix the specimen. If the height is too low, the specimen will be unstable when fixed and the specimen will be easy to move during processing.

[0025] (6) The depth of both ends of the processed notch is consistent and there are no burrs, which fully meets the national standard requirements of the Charpy impact test with high precision and efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A top view of a fixture device for machining a notch of an impact specimen according to the present invention;

[0027] Figure 2 The figure is a side sectional view of a fixture device for machining a notch of an impact specimen according to the present invention. DETAILED DESCRIPTION

[0028] To make the present invention more clearly understood, a fixture device and method for machining a notch of an impact specimen of the present invention are further described below. The specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0029] See also Figure 1 and Figure 2 A fixture device for processing a notch of an impact specimen comprises a height-equalizing iron 1 and a vise 2 arranged on both sides of the height-equalizing iron 1, characterized in that:

[0030] The jaws 21 of each side of the bench vise 2 are provided with a pair of rectangular notches 211 and a V-shaped notch 212. The rectangular notch 211 includes a first notch 211a and a second notch 211b, which are respectively provided on both sides of the V-shaped notch 212. The distance from the V-shaped notch 212 to the first notch 211a is 27.5 mm, and the distance between the two rectangular notches 211 is ≥55 mm.

[0031] The width of the rectangular notch 211 is 3-5 mm, and the shape and size of the V-notch 212 refer to the standard requirements of the V-notch of the Charpy impact specimen;

[0032] The equal height iron 1 is connected to a pair of mutually parallel sliding baffles 3 through sliding bolts 4. The height of the sliding baffles 3 exceeds the equal height iron 1 by 2-5 mm. The sliding baffles 3 are arranged parallel to the rectangular notch 211 to fix the sample.

[0033] The hardness of the jaws 21 is HV>400.

[0034] In this embodiment, improvements are mainly made in two aspects:

[0035] The first part is the improvement of the bench vise 2: a V-shaped notch 212 is processed on the jaw 21 of the bench vise 2. The notch shape and size standards refer to the standard requirements of the V-shaped notch of the Charpy impact specimen. After processing a certain number of specimens, if the notch shape does not meet the requirements, the jaws can be replaced in time. It is simple and convenient. The material of the jaw 21 is a material with a slightly higher hardness, generally HV over 400; at the same time, a rectangular notch 211 is processed on both sides of the V-shaped notch 212, such as Figure 1 and Figure 2 As shown, the width of the rectangular notch 211 is 3-5 mm, and the depth is based on the convenience of sliding the second part of the sliding baffle. The distance between the first notch 211a and the second notch 211b is ≥55 mm.

[0036] The second part is an improvement on the equal height iron 1: a sliding baffle 3 is added at a position parallel to the equal height iron 1 and the rectangular notch 211 of the jaws 21, and fixed to the equal height iron 1 with a slidable bolt. The height of the sliding baffle 3 beyond the equal height iron 1 is 2~5mm. The height below 5mm is to meet the processing requirements of specimens of different sizes of 5×10mm, 7.5×10mm, and 10×10mm. The height above 2mm is to better fix the specimen. If the height is too low, the specimen is unstable when fixed, and the specimen is easy to move during processing, such as Figure 1 and Figure 2 shown.

[0037] The distance between the two rectangular notches 211 of the fixture must be ≥55mm. Since the length of the impact specimen is 55mm, the shortest distance after the two sliding baffles 3 are fully clamped is 55mm. At the same time, ensure that the distance from the rectangular notch 211 on one side to the V-shaped notch 212 is 27.5mm, the depth of the V-shaped notch 212 is 2mm, and ensure that the distance from the bottom of the V-shaped notch 212 to the equal-height iron 1 is 8mm, which meets the national standard requirement that the distance from the bottom of the impact specimen notch to the lower surface of the specimen is 8mm.

[0038] The method for machining a notch of an impact specimen using the above device comprises the following steps, which are characterized in that:

[0039] (1) Modify the jaw 21 of the bench vise 2 according to the above requirements, process the first notch 211a, the second notch 211b and the V-shaped notch 212, and place them aside after processing. Multiple jaws can be processed for easy replacement;

[0040] (2) Modify the equal-height iron 1 according to the above requirements, install the sliding baffle 3, and place it for standby after processing. Multiple equal-height irons can be processed for easy replacement;

[0041] (3) Install and modify the back clamp 2 and the equal height iron 1, fix the first notch 211a and the second notch 211b with the sliding baffle 3 as required, align the V-shaped notch 212 with the milling cutter of the horizontal milling, and the distance from the bottom end of the V-shaped notch 212 to the equal height iron 1 is 8 mm;

[0042] (4) Arrange the samples that need to be processed with notches in groups, place a group of 6 samples on the equal-height iron 1, move the sliding baffle 3 to fix the samples, and ensure that the distance from the V-shaped notch 212 to the first notch 211a is 27.5 mm;

[0043] (5) Start the horizontal milling machine to process the notch of the specimen;

[0044] (6) After processing, turn off the horizontal milling machine and replace the sample that needs to be processed until all the samples are processed;

[0045] (7) After a certain number of processing, the shape of the V-notch 212 changes and does not meet the requirements. The jaws can be replaced in time.

[0046] The present invention improves the bench vise and iso-high iron of a horizontal milling machine to make it a clamp device for processing the notch of an impact specimen, which can conveniently and quickly process the impact notch, improve efficiency and meet the notch accuracy requirements.

[0047] In addition to the above embodiments, the present invention may also have other implementation modes. Any technical solution formed by equivalent replacement or equivalent transformation falls within the protection scope required by the present invention.

Claims

1. A fixture device for machining a notch of an impact specimen, comprising a height iron (1) and a vise (2) arranged on both sides of the height iron (1), characterized in that: The jaws (21) of each side vise (2) are provided with a pair of rectangular notches (211) and a V-shaped notch (212), the rectangular notch (211) comprising a first notch (211a) and a second notch (211b), the first notch (211a) and the second notch (211b) being respectively provided on two sides of the V-shaped notch (212), the distance from the V-shaped notch (212) to the first notch (211a) being 27.5 mm, and the distance between the two rectangular notches (211) being ≥55 mm; A pair of mutually parallel sliding baffles (3) are connected to the equal-height rail (1), and the sliding baffles (3) are arranged parallel to the rectangular notch (211).

2. The fixture device for machining a notch of an impact specimen according to claim 1, characterized in that: The width of the rectangular notch (211) is 3-5 mm.

3. The fixture device for machining a notch of an impact specimen according to claim 1 or 2, characterized in that: The shape and size standards of the V-notch (212) refer to the standard requirements for the V-notch of the Charpy impact specimen.

4. The fixture device for machining a notch of an impact specimen according to claim 1 or 2, characterized in that: The hardness of the jaws (21) is HV>400.

5. The fixture device for machining a notch of an impact specimen according to claim 1 or 2, characterized in that: The sliding baffle (3) is connected to the equal height rail (1) via a sliding bolt (4).

6. The fixture device for machining a notch of an impact specimen according to claim 1 or 2, characterized in that: The height of the sliding baffle (3) exceeding the height of the equal-height rail (1) is 2 to 5 mm.

7. A method for machining a notch of an impact specimen using the device as claimed in claim 1, comprising the following specific steps, characterized in that: Step 1: Install the improved bench vise (2) and the equal height iron (1) on a horizontal milling machine; Step 2: Place the samples to be notched side by side on the equal-height iron (1), the length of the samples being 55 mm and the width being 10 mm, and each sample being placed perpendicularly to the sliding baffle (3), and the sliding baffle (3) is used to fix the sample; Step 3: Align the V-shaped notch (212) of the jaws (21) with the cutting edge of the horizontal milling machine, ensuring that the distance between the V-shaped notch (212) and one end of the specimen in the length direction is 27.5 mm; Step 4: Adjust the height of the equal height iron (1) so that the distance between the bottom end of the V-shaped notch (212) and the lower surface of the sample is 8 mm; Step 5: Start the equipment, the milling cutter can complete the notch processing of a row of samples at one time. After the processing is completed, turn off the horizontal milling machine and replace the samples that need notch processing until all the processing is completed.

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