Precise positioning device and processing method of cesium iodide crystal for nuclear radiation detection

Abstract

The present application relates to precision positioning device and processing method of cesium iodide crystal for nuclear radiation detection, wherein the precision positioning device for bonding square columnar cesium iodide crystal and cylindrical special tool includes: right-angle workpiece positioning device; the length of the outer right angle of the right-angle workpiece positioning device is (90-110) mm x (90-110) mm, the length of the inner right angle is (70-90) mm x (70-90) mm, and the width is (90-110) mm. The cesium iodide crystal material utilization rate is improved by 20% by using the precision positioning device and processing method.

Description

Technical Field

[0001] This invention relates to a precision positioning device and a processing method for cesium iodide crystals for nuclear radiation detection. Specifically, it relates to a precision positioning device for bonding square columnar cesium iodide crystals and cylindrical special tooling, and a processing method for small-sized cesium iodide crystals for nuclear radiation detection, belonging to the field of crystal processing. Background Technology

[0002] Since the Fukushima nuclear accident in Japan in 2011, the demand for nuclear radiation detection equipment has surged. Among these, the φ10mm×35mm cesium iodide cylinder is a core component. Because cesium iodide crystals are ductile and hygroscopic, with physical properties similar to lead, using the traditional two-pin grinding method results in product compression bending, edge curling, and insufficient processing precision, leading to low yield (approximately 50%) and low efficiency (only 50 pieces per machine per day). Therefore, improving material utilization, processing yield, and efficiency has become a pressing issue for the entire industry. Summary of the Invention

[0003] Therefore, based on the accumulation, thinking and practice of long-term work on the front line of processing, the inventor has creatively proposed a device for precise positioning of prismatic cesium iodide crystals for bonding, and implemented a processing operation method for cesium iodide crystals for nuclear radiation detection.

[0004] Specifically, the present invention provides a precision positioning device for bonding square columnar cesium iodide crystals and cylindrical special tooling, comprising: a right-angle workpiece positioning device;

[0005] The outer right angle of the right-angle workpiece positioning device has a side length of (90~110)mm×(90~110)mm, the inner right angle has a side length of (70~90)mm×(70~90)mm, and a width of (90~110)mm.

[0006] Preferably, the outer right angle of the right-angle workpiece positioning device has a side length of 100×100mm, the inner right angle has a side length of 80×80mm, and the width is 100mm.

[0007] Preferably, the bottom diameter of the prismatic cesium iodide crystal is ≥11mm and ≤12mm, and the height is 35±0.1mm.

[0008] Preferably, the cylindrical special tooling has a diameter of Φ9~9.5mm and a length of 60mm.

[0009] Preferably, the cylindrical tooling is made of 45# steel or copper. Standard tooling is a pre-designed product and can be purchased directly from the market.

[0010] Preferably, a first shim and a second shim are respectively provided on the right-angle fold line of the right-angle workpiece positioning device, and the first shim and the second shim are arranged perpendicularly to each other.

[0011] Preferably, the height of the first gasket and the second gasket is half the difference in diameter between the square columnar cesium iodide crystal and the cylindrical special tooling.

[0012] Preferably, the gasket is made of glass or a metal plug gauge (which can be purchased directly from the market).

[0013] On the other hand, the present invention provides a method for processing cesium iodide crystals for nuclear radiation detection, wherein the cesium iodide crystals for nuclear radiation detection are cylindrical with a diameter of Φ10±0.1mm and a height of 35±0.1mm;

[0014] The processing method includes:

[0015] (1) A device for precise positioning for bonding prismatic cesium iodide crystals is used to bond the prismatic cesium iodide crystals to the center of a cylindrical special tooling using an adhesive.

[0016] (2) Using a straight shank ER chuck special tool, a cylindrical special tooling is fixed on a CNC external cylindrical grinding machine, and longitudinal grinding is used to process the cesium iodide crystal for nuclear radiation detection. Finally, the binder is removed by heating to obtain the cesium iodide crystal for nuclear radiation detection.

[0017] Preferably, the bottom diameter of the prismatic cesium iodide crystal is ≥11mm and ≤12mm, and the height is 35±0.1mm (directly processed to the size required by the drawing); more preferably, the size of the prismatic cesium iodide crystal is 11mm×11mm×35mm.

[0018] Preferably, the cylindrical special tooling has a diameter of Φ9~9.5mm and a length of 60mm; the cylindrical special tooling is made of 45# steel or copper.

[0019] Preferably, the method for preparing the prismatic cesium iodide crystal includes:

[0020] 1) The cesium iodide crystal block is processed into a flat surface with a height of 35±0.1mm and polished on both sides;

[0021] 2) After applying hot melt adhesive to cover the two end planes of the cesium iodide crystal block, use an internal circular cutter to cut it into square columnar cesium iodide crystals along the end plane direction.

[0022] Preferably, the thickness of the glass is 1 to 2 mm, and more preferably 1 mm.

[0023] Preferably, the cutting parameters include: the feed rate of the internal circle cutting machine is 10-20 mm / min.

[0024] Preferably, the adhesive is 502 glue or a similar instant adhesive.

[0025] Preferably, the parameters of the longitudinal grinding method include: using a CNC cylindrical grinding machine, a feed rate of 0.5 to 1 mm per pass, and a feed speed of 30 to 50 mm / min.

[0026] The present invention also provides a cesium iodide crystal for nuclear radiation detection prepared by the above processing method. The cesium iodide crystal for nuclear radiation detection is cylindrical with a diameter of Φ10±0.1mm and a height of 35±0.1mm. The yield of the cesium iodide crystal for nuclear radiation detection is ≥99%.

[0027] Beneficial effects:

[0028] By employing the precise positioning device and processing method of this invention, the utilization rate of cesium iodide crystal material is increased by 20%, and the processing efficiency is increased from 50 pieces per day to 150 pieces per day (an increase of 175%). The yield of cesium iodide crystal material is increased from 70% to over 99%. In this invention, the entire processing of cesium iodide crystals for nuclear radiation detection is automated, ensuring that the entire production process is free from human interference, greatly improving the cost-effectiveness of the product, and enhancing the market competitiveness of downstream detectors and complete products. Attached Figure Description

[0029] Figure 1 A precision positioning device for bonding prismatic cesium iodide crystals and cylindrical special tooling;

[0030] Figure 2 Photograph of a cylindrical tooling fixture;

[0031] Figure 3 A photograph of prismatic cesium iodide crystals;

[0032] Figure 4 A photograph of a prismatic cesium iodide crystal bonded to a cylindrical special tooling;

[0033] Figure 5 A photograph of the processing of prismatic cesium iodide crystals;

[0034] Figure 6 A photograph of the cesium iodide crystals obtained for nuclear radiation detection. Detailed Implementation

[0035] The present invention will be further illustrated by the following embodiments. It should be understood that the following embodiments are for illustrative purposes only and are not intended to limit the present invention.

[0036] The following is an example illustrating a method for fabricating cesium iodide crystals for small-sized nuclear radiation detection.

[0037] First, the crystal block is processed into a flat surface with a height of 35mm and polished on both sides to meet the length direction requirements.

[0038] Use 1mm glass with hot melt adhesive to cover both ends to solve the problems of surface deliquescence and curling edges after rounding.

[0039] Use an internal circle cutter to cut a square column of 11mm x 11mm x 35mm along the end face direction.

[0040] Using 502 glue, the square column is bonded to the center of the specially designed tooling. Using a straight shank ER chuck special tool, the longitudinal grinding method is programmed on a CNC cylindrical grinding machine to achieve high yield and high precision mass production.

[0041] The following examples further illustrate the present invention in detail. It should also be understood that the following examples are only for further explanation of the present invention and should not be construed as limiting the scope of protection of the present invention. Any non-essential improvements and adjustments made by those skilled in the art based on the above description of the present invention are within the scope of protection of the present invention. The specific process parameters, etc., in the following examples are merely examples within a suitable range; that is, those skilled in the art can make appropriate selections within the appropriate range based on the description herein, and are not intended to be limited to the specific values ​​in the examples below.

[0042] Example 1

[0043] First, process the cesium iodide crystal block into a flat surface with a height of 35mm and polished on both sides;

[0044] Use 1mm thick glass and hot melt adhesive to cover both ends;

[0045] Cesium iodide square prisms of 11mm×11mm×35mm are cut along the end face using an internal circle cutting machine. The cutting parameters include: the feed rate of the internal circle cutting machine is 10~20mm / min.

[0046] Using a precision positioning device (the outer right angle of the right-angle workpiece positioning device has a side length of 100×100mm, the inner right angle has a side length of 80×80mm, and a width of 100mm; a first shim and a second shim are respectively set at the center of the right-angle fold line of the right-angle workpiece positioning device, the shim material is glass or metal plug gauge (which can be purchased directly from the market), and the thickness is 1 / 2 of the diameter difference between the square columnar cesium iodide crystal and the cylindrical special tooling), 502 glue is used to bond the cesium iodide square columnar crystal to the center of the designed cylindrical special tooling (material is 45# steel or copper, diameter is Φ9mm, length is 60mm);

[0047] Using a straight shank ER chuck as a special tool, longitudinal grinding is employed on a CNC cylindrical grinding machine to achieve high yield and high precision in mass production. The parameters for longitudinal grinding include: using a CNC cylindrical grinding machine, a feed rate of 0.5–1 mm per pass, and a feed rate of 30–50 mm / min.

[0048] The implementation of the above-mentioned operation method has improved the automation level of the entire production process and significantly increased the material utilization rate of the crystal.

[0049] This operational method overcomes the processing drawbacks of cesium iodide crystals being easily bent and deformed in small sizes, and proposes a new method for processing materials with similar physical properties (scintillation crystals and ultrasoft metals), with significant results. It increases material utilization by 20%, processing efficiency from 50 pieces per day to 150 pieces per day, an improvement of 175%. The yield rate increases from 70% to over 99%, meeting market demand.

Claims

1. A precision positioning device for bonding prismatic cesium iodide crystals and cylindrical special tooling, characterized in that, include: Right-angle workpiece positioning device; The outer right angle of the right-angle workpiece positioning device has a side length of (90~110) mm × (90~110) mm, the inner right angle has a side length of (70~90) mm × (70~90) mm, and a width of (90~110) mm. The prismatic cesium iodide crystal has a base diameter ≥11mm and ≤12mm and a height of 35±0.1mm; the cylindrical special tool has a diameter of Φ9~9.5mm and a length of 60mm; the cylindrical special tool is made of 45# steel or copper. The right-angle workpiece positioning device has a first shim and a second shim respectively arranged on the right-angle broken line, and the first shim and the second shim are arranged perpendicularly to each other. The height of the first and second gaskets is half the difference in diameter between the square columnar cesium iodide crystal and the cylindrical special tooling.

2. The precise positioning device according to claim 1, characterized in that, The outer right angle of the right-angle workpiece positioning device has a side length of 100×100mm, the inner right angle has a side length of 80×80mm, and a width of 100mm.

3. The precise positioning device according to claim 1, characterized in that, The gasket is made of glass or metal.

4. A method for processing cesium iodide crystals for nuclear radiation detection, characterized in that, The cesium iodide crystal used for nuclear radiation detection is cylindrical, with a diameter of Φ10±0.1mm and a height of 35±0.1mm; The processing method includes: (1) Using the device for precise positioning of bonding prismatic cesium iodide crystals as described in claim 1, the prismatic cesium iodide crystals are bonded to the center of a cylindrical special tooling using an adhesive; the bottom diameter of the prismatic cesium iodide crystals is ≥11mm and ≤12mm, and the height is 35±0.1mm; (2) Using a straight shank ER chuck special tool, a cylindrical special tooling is fixed on a CNC external cylindrical grinding machine, and longitudinal grinding is used to process the cesium iodide crystal for nuclear radiation detection. Finally, the binder is removed by heating to obtain the cesium iodide crystal for nuclear radiation detection.

5. The processing method according to claim 4, characterized in that, The dimensions of the prismatic cesium iodide crystal are 11 mm × 11 mm × 35 mm.

6. The processing method according to claim 4 or 5, characterized in that, The method for preparing the prismatic cesium iodide crystal includes: The method for preparing the prismatic cesium iodide crystal includes: 1) The cesium iodide crystal block is processed into a flat surface with a height of 35±0.1mm and polished on both sides; 2) After applying hot melt adhesive to cover the two end planes of the cesium iodide crystal block, use an internal circle cutter to cut it into square columnar cesium iodide crystals along the end plane direction.

7. The processing method according to claim 6, characterized in that, The thickness of the glass is 1 to 2 mm; The cutting parameters include: the feed rate of the internal circle cutting machine is 10-20 mm / min.

8. The processing method according to claim 4, characterized in that, The adhesive is 502 glue; The parameters of the longitudinal grinding method include: using a CNC cylindrical grinding machine, a feed rate of 0.5 to 1 mm per pass, and a feed speed of 30 to 50 mm / min.

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