A rapid positioning method for end-quenching sample sampling

Abstract

The present invention discloses a method for fast positioning of end-quenched sample sampling. It belongs to the field of sample processing and positioning, and the steps are: measuring the inner diameter D1 of the hollow drill; processing a positioning block, one end of which has a diameter of D1-0.5mm and a length of L1, and the other end of which has a diameter of D1+2h and a length of L2; inserting one end of the positioning block with a diameter of (D1-0.5mm) into the bore of the hollow drill, moving the drill bit of the hollow drill so that the edge of the end of the positioning block with a diameter of (D1+2h) is tangent to the outer edge of the steel rod; locking the position of the steel rod, removing the positioning block, and then taking out the blank that meets the standard requirements normally. The present invention is a method for fast and accurate positioning of sampling using a hollow drill, which can quickly locate the sampling position of the processed sample, improve work efficiency, and also improve the accuracy of sample sampling, providing a guarantee for the accuracy of subsequent end-quenching test results. The auxiliary tool designed and processed by the invention is simple in design and easy to load and unload, and does not require modification of existing equipment fixtures.

Description

Technical Field

[0001] The invention belongs to the field of sample processing and positioning, and relates to a method for quickly positioning the sampling of an end-quenched sample; in particular, it relates to a method for quickly positioning the sampling position by using a hollow drill. Background Art

[0002] In the prior art, the end-quench test is a common method for determining the hardenability of steel materials. The end-quench specimen is typically 25 mm in diameter and 100 mm in length. After being heated to fully austenitize, it is sprayed with water on an end-quenching machine at one end and the hardness value is measured as a function of distance from the water-cooled section to measure the hardenability of the test steel. For sampling round steel bars, a hollow drill is used to remove a blank with a diameter of 28 mm to 35 mm and a length of 110 mm. After normalizing heat treatment, the blank is then processed into a 25 mm x 100 mm specimen with a flange at one end. When removing the 28 mm to 35 mm blank, the center of the blank must be 15 to 25 mm from the surface of the original steel bar. Measuring the position using a traditional ruler is prone to errors and inefficient. Summary of the Invention

[0003] Purpose of the invention: The purpose of the present invention is to accurately and quickly locate the sampling position when using a hollow drill to dig out the end-quenched sample blank, thereby solving the practical problems of inaccurate sampling position and difficult positioning during the processing process.

[0004] The invention can quickly locate the specimens at the same distance from the edge of the steel bar by using the auxiliary block, meeting the test requirements. The auxiliary block is easy to process and quick to install, providing a convenient and quick method for removing and quickly positioning the end-quenched specimens.

[0005] Technical solution: The specific operating steps of the method for rapid positioning of end-quenched specimen sampling described in the present invention are as follows:

[0006] (1.1) Measure the inner diameter D1 of the hollow drill and place it on the drilling machine;

[0007] (1.2) Process the positioning block and select a steel rod;

[0008] (1.3) Insert one end of the processed positioning block into the drill hole of the hollow drill, and move the drill bit of the hollow drill so that the edge of the other end of the positioning block is tangent to the outer edge of the steel rod;

[0009] (1.4) Lock the position of the steel rod, remove the positioning block, and then you can take out the blank that meets the standard requirements.

[0010] Furthermore, in step (1.2), the positioning block is cylindrical in shape.

[0011] Furthermore, in step (1.2), the diameter of one end of the positioning block is D1-0.5 mm and the length is L1;

[0012] The diameter of the other end is D1+2h and the length is L2;

[0013] The size of h satisfies 15mm≤(D1 / 2+h)≤25mm, and the lengths of L1 and L2 are not limited.

[0014] Furthermore, in step (1.3), the diameter of the positioning block first inserted into one end of the hollow drill hole is D1-0.5 mm;

[0015] After moving the drill bit of the hollow drill, the diameter of the other end of the positioning block tangent to the steel rod is D1+2h.

[0016] Furthermore, in step (1.4), the distance between the center of the blank and the surface of the original steel rod is between 15-25 mm.

[0017] Beneficial effects: Compared with the prior art, the present invention has the following advantages: 1. The present invention is easy to operate and has accurate positioning. The positioning block can be reused after being processed without the need to modify the equipment, and the investment cost is low; 2. The present invention has lower requirements for personnel, and the original size measurement positioning is transformed into intuitive and visible alignment positioning, which greatly reduces the error rate of the processing process; 3. The present invention shortens the positioning time to 1 / 3 of the original time, and the positioning error is reduced to within 0.5mm. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a top view of the positioning block in the present invention;

[0019] Figure 2 This is a front view of the positioning block in the present invention;

[0020] Figure 3 It is a schematic diagram of positioning during processing in the present invention. DETAILED DESCRIPTION

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0022] As shown in the figure, the method for rapid positioning of end-quenched specimen sampling according to the present invention includes the following steps:

[0023] (1) Measure the inner diameter D1 of the hollow drill;

[0024] (2) The positioning block is a cylinder with a diameter of D1-0.5mm and a length of L1 at one end, and a diameter of D1+2h and a length of L2 at the other end. The size of h must meet the requirement of 15mm≤(D1 / 2+h)≤25mm. The lengths of L1 and L2 are not limited for ease of use. Figures 1 and 2 As shown;

[0025] (3) Insert one end of the processed positioning block with a diameter of (D1-0.5mm) into the hole of the hollow drill, and move the drill bit of the hollow drill so that the edge of the end of the positioning block with a diameter of (D1+2h) is tangent to the outer edge of the steel rod;

[0026] (4) Lock the position of the steel rod and remove the positioning block, then you can take out the blank that meets the standard requirements normally.

[0027] The present invention utilizes existing processing equipment without the need to modify the equipment. It only needs to utilize the existing equipment to process a simple positioning accessory, which can quickly complete the positioning of the end-quenched sample and improve the processing accuracy and efficiency.

[0028] Example 1:

[0029] The end-quenched blank specimen is taken from a 20CrMnTiH steel bar with a diameter of Φ75mm. The diameter of the blank specimen is Φ30mm. The specific process is as follows:

[0030] (1) Select a hollow drill bit with an inner diameter of Φ30mm and install it on the drilling machine;

[0031] (2) Processing positioning block: select a steel rod, process one end of it to have a diameter of (D1-0.5mm)=29.5mm, and the other end to have a diameter of D1+2h=40mm. The total length is 50mm, and the lengths of different diameter sections are L1=40mm and L2=10mm respectively. Figures 1 and 2 As shown;

[0032] (3) Insert the positioning block into the middle hole of the hollow drill, clamp the steel rod on the workbench, and move the drill bit of the hollow drill so that the edge of the positioning block is tangent to the outer edge of the steel rod. Figure 3 As shown;

[0033] (4) Lock the position of the steel rod, remove the positioning block, and take out the blank with a diameter of Φ30mm. The center of the blank is 20mm away from the surface of the original steel rod.

[0034] The above are merely preferred embodiments of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions based on the principles of the present invention are within the scope of protection of the present invention. It should be noted that for those skilled in the art, various improvements and modifications that do not depart from the principles of the present invention should be considered within the scope of protection of the present invention.

Claims

1. A method for rapid positioning of end-quenched specimens, characterized in that: The end-quenched blank specimen is taken from a 20CrMnTiH steel bar with a diameter of Φ75mm. The diameter of the blank specimen is Φ30mm. The specific process is as follows: (1) Select a hollow drill bit with an inner diameter of Φ30mm and install it on the drilling machine; (2) Processing the positioning block: select a steel rod, process one end of it to a diameter of (D1-0.5mm)=29.5mm, and the other end to a diameter of D1+2h=40mm, with a total length of 50mm. The lengths of the different diameter sections are L1=40mm and L2=10mm respectively; (3) Insert the positioning block into the middle hole of the hollow drill, clamp the steel rod on the workbench, and move the drill bit of the hollow drill so that the edge of the positioning block is tangent to the outer edge of the steel rod; (4) Lock the position of the steel rod, remove the positioning block, and take out the blank with a diameter of Φ30mm. The center of the blank is 20mm away from the surface of the original steel rod.

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