Surface treatment method of beryllium sheet for X-ray

Abstract

The invention provides a surface treatment method for an X-ray beryllium sheet, and relates to the technical field of metal surface treatment. The method comprises the following steps that S1, according to the preset grinding machining amount, a double-end-face grinding machine is adopted for conducting surface grinding on a beryllium sheet; s2, soaking the beryllium sheet subjected to surface grinding in an organic solvent for primary surface cleaning, and then taking out the beryllium sheet subjected to primary surface cleaning, wiping and airing; s3, the beryllium sheet obtained in the step S2 is adsorbed to a vacuum suction cup and then placed on a crawler belt of a sand blasting machine, and uniform sand blasting is conducted on the beryllium sheet through a swinging sand blasting gun; wherein the material for uniform sand blasting is glass beads, and the mesh number of the glass beads is 80-120; and S4, carrying out secondary surface cleaning on the beryllium sheet subjected to uniform sand blasting by adopting an organic solvent, wiping, airing and then carrying out vacuum packaging. The X-ray beryllium sheet treated by the method is matte in surface and uniform in color.

Description

Technical Field

[0001] The invention belongs to the technical field of metal surface treatment, and in particular relates to a surface treatment method of a beryllium sheet for X-rays. Background Art

[0002] Beryllium material has a strong ability to transmit X-rays, has good dimensional stability, and has good thermal conductivity. It is known as metallic glass. Beryllium sheets are irreplaceable materials for X-ray windows and are used in prospecting, flaw detection, human disease inspection, security equipment and other fields. Most metals can absorb X-rays, and only a few metals can allow X-rays to penetrate, such as beryllium and aluminum. However, the penetration of X-rays to beryllium is more than 1.7 times that of aluminum, so beryllium sheets are excellent materials for X-ray windows. At the same time, beryllium windows have high requirements for surface quality. Beryllium materials are obtained through powder metallurgy. Beryllium sheets are prone to scratches, pits, dirt and other defects during processing. These defects will affect the transmission effect of X-rays. In addition, beryllium materials are hard and brittle, and surface treatment is difficult. It is difficult to obtain beryllium sheets for X-ray windows that meet surface quality requirements using conventional machining methods such as turning and milling.

[0003] The existing surface treatment methods for beryllium plates include crawler sander polishing technology and chemical treatment. Belt polishing is to pre-polish the surface of the beryllium plate with a certain mesh sander, so there will be visible grinding marks. Even if the finish is very high, the grinding marks are still difficult to eliminate. They can only be eliminated by manual polishing, and the production efficiency is low. The chemical treatment method is to put the beryllium plate into a prepared pickling solution, and corrode it through the chemical reaction between the acid and the surface of the beryllium plate, so as to achieve the effect of surface treatment of the beryllium plate. However, a small amount of strong acid must be added for chemical treatment, and the surface of the beryllium plate is prone to pitting, forming pits or pits visible to the naked eye. In addition, as the chemical treatment time passes, the temperature decreases, and the speed of corrosion is difficult to control, and the dimensional tolerance is also difficult to guarantee.

[0004] Therefore, a new surface treatment method for X-ray beryllium sheets is urgently needed. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides a surface treatment method for X-ray beryllium sheets, which is surface treated by double-end surface grinding and glass bead sandblasting, and has the advantages of high production efficiency, matte surface treatment, uniform color, etc.

[0006] The present invention provides a surface treatment method for X-ray beryllium sheets, the method comprising the following steps:

[0007] Step S1, grinding the surface of the beryllium sheet using a double-end grinder according to a preset grinding amount;

[0008] Step S2, immersing the surface-ground beryllium sheet in an organic solvent for a first surface cleaning, then taking out the surface-cleaned beryllium sheet, wiping it, and drying it;

[0009] Step S3, adsorbing the beryllium sheet obtained in step S2 onto the vacuum suction cup and placing it on the crawler of the sandblasting machine, and performing uniform sandblasting on the beryllium sheet by using a swinging sandblasting gun;

[0010] Wherein, the material for homogenizing sandblasting is glass beads, and the mesh number of the glass beads is 80-120 mesh;

[0011] Step S4, using an organic solvent to clean the surface of the beryllium sheet after homogenization sandblasting for a second time, wiping and drying it, and then vacuum packaging it.

[0012] According to the surface treatment method of X-ray beryllium sheet of the present invention, in the step S1, the applied pressure of the surface grinding is 40-120 kPa.

[0013] According to the surface treatment method of X-ray beryllium sheet of the present invention, in the step S1, the grinding wheel used for surface grinding is a silicon carbide bonded diamond grinding wheel with a mesh size of 800-1200.

[0014] According to the surface treatment method of X-ray beryllium sheet of the present invention, the rotation speed of the grinding wheel is 10-40r / min.

[0015] According to the surface treatment method for X-ray beryllium sheets of the present invention, in step S2, the immersion time for the first surface cleaning is 20-30 minutes.

[0016] According to the surface treatment method of X-ray beryllium sheet of the present invention, in step S3, when the beryllium sheet is adsorbed on the vacuum suction cup, the pressure holding time of the vacuum suction cup is not less than 10 minutes, and the vacuum degree of the vacuum suction cup is less than 10 kPa.

[0017] According to the surface treatment method of X-ray beryllium sheet of the present invention, in step S3, the swing range of the sandblasting gun is 20-100 mm, and the sandblasting pressure of the sandblasting gun is 0.3-0.5 MPa.

[0018] According to the surface treatment method of X-ray beryllium sheet of the present invention, in step S3, the homogenization sandblasting time is 1-5 minutes.

[0019] According to the surface treatment method of X-ray beryllium sheet of the present invention, the organic solvent is acetone, anhydrous ethanol or kerosene.

[0020] According to the surface treatment method of the X-ray beryllium sheet of the present invention, the beryllium sheet after the first surface cleaning and / or the second surface cleaning is wiped with a degreased veil.

[0021] The solution proposed by the present invention has the following technical effects:

[0022] The invention performs surface treatment on the X-ray beryllium sheet through the process of double-end surface grinding and glass bead sandblasting, and has the advantages of high production efficiency, matte surface treatment, uniform color and the like.

[0023] In addition, the method of the present invention can process hundreds of beryllium sheets at the same time, with a thickness tolerance within 0.02 mm, further effectively improving work efficiency and being suitable for industrial production. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 The figure is a schematic flow chart of a surface treatment method of a beryllium sheet for X-ray use in one embodiment of the present invention. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] This embodiment provides a surface treatment method for X-ray beryllium sheet, such as Figure 1 The method comprises the following steps:

[0028] Step S1, grinding the surface of the beryllium sheet using a double-end grinder according to a preset grinding amount.

[0029] Step S2, immersing the surface-ground beryllium sheet in an organic solvent for a first surface cleaning, then taking out the surface-cleaned beryllium sheet, wiping it, and drying it.

[0030] Step S3, the beryllium sheet obtained in step S2 is adsorbed on the vacuum suction cup and then placed on the crawler of the sandblasting machine, and the beryllium sheet is uniformly sandblasted by a swinging sandblasting gun.

[0031] Wherein, the material for homogenizing sandblasting is glass beads, and the mesh number of the glass beads is 80-120 meshes.

[0032] In this embodiment, the smaller the mesh number of the glass beads, the greater the surface roughness of the beryllium sheet after sandblasting; if the mesh number of the glass beads is too large, it is easy to cause pits on the surface of the beryllium sheet, affecting its use. Therefore, in this embodiment, the mesh number of the glass beads is controlled at 80-120 meshes.

[0033] Step S4, using an organic solvent to clean the surface of the beryllium sheet after homogenization sandblasting for a second time, wiping and drying it, and then vacuum packaging it.

[0034] Preferably, the beryllium rod containing ≥98.5wt% beryllium is turned and then cut into beryllium sheets to be surface treated by wire electrospark cutting, with a thickness allowance of 0.05-0.10mm.

[0035] In step S1, a double-end surface grinder is used to grind the surface of a beryllium sheet according to a preset grinding amount.

[0036] In some embodiments, in the step S1, the applied pressure of the surface grinding is 40-120 kPa.

[0037] In some embodiments, in the step S1, the grinding wheel used for the surface grinding is a silicon carbide bonded diamond grinding wheel with a mesh size of 800-1200.

[0038] In some embodiments, the grinding wheel has a rotation speed of 10-40 r / min.

[0039] In this embodiment, a double-end grinder with a 800-1200 mesh silicon carbide bonded diamond grinding wheel is used to grind the surface of the beryllium sheet to remove defects such as line marks, oxide layers, and pits caused by the cutting of the beryllium sheet. When the pressure or rotation speed is too high, it is easy to cause the hard and brittle beryllium sheet to break or add new scratches to cause secondary defects, and when the pressure or rotation speed is too low, the contact between the grinding wheel and the beryllium sheet is poor, the grinding force is small, the time is prolonged, and the work efficiency is reduced. Therefore, the applied pressure of the surface grinding in this embodiment is 40-120kPa, and the rotation speed of the grinding wheel is 10-40r / min.

[0040] In addition, the method of this embodiment can grind 20 to 80 beryllium sheets at the same time, further effectively improving work efficiency and being suitable for industrial production.

[0041] In step S2, the surface-ground beryllium sheet is immersed in an organic solvent for a first surface cleaning, and then the beryllium sheet after the first surface cleaning is taken out, wiped and dried.

[0042] In some embodiments, in step S2, the soaking time for the first surface cleaning is 20-30 minutes.

[0043] In some embodiments, the organic solvent is acetone, anhydrous ethanol or kerosene.

[0044] In some embodiments, the beryllium sheet after the first surface cleaning is wiped with a degreasing veil to allow it to dry quickly.

[0045] In this embodiment, the purpose of the first surface cleaning is to remove the emulsion, surface particles, oil stains and other contaminants on the surface of the beryllium sheet to facilitate the subsequent uniform sandblasting process.

[0046] It should be noted that when multiple beryllium sheets are soaked and cleaned at one time, each beryllium sheet needs to be placed separately to avoid scratching the surface of the beryllium sheets.

[0047] In step S3, the beryllium sheet obtained in step S2 is adsorbed on a vacuum suction cup and then placed on a crawler of a sandblasting machine, and the beryllium sheet is uniformly sandblasted by a swinging sandblasting gun.

[0048] In some embodiments, in step S3, when the beryllium sheet is adsorbed on the vacuum chuck, the holding time of the vacuum chuck is not less than 10 minutes, and the vacuum degree of the vacuum chuck is less than 10 kPa, so as to achieve uniform sandblasting.

[0049] The vacuum suction cup of this embodiment has a pressure-maintaining function and can be used without a vacuum unit.

[0050] In some embodiments, in step S3, the swing range of the sandblasting gun is 20-100 mm so that glass beads can be sprayed on every part of the surface of the beryllium sheet, and the sandblasting pressure of the sandblasting gun is 0.3-0.5 MPa.

[0051] In some embodiments, in step S3, the homogenization sandblasting time is 1-5 minutes, so that the thickness of the glass beads on the surface of the beryllium sheet is moderate, forming a matte and uniform-colored beryllium sheet surface.

[0052] In this embodiment, the blasting pressure of the sandblasting gun is 0.3-0.5 MPa. If the blasting pressure is too small, the surface color of the beryllium sheet after sandblasting will be uneven, and if the blasting pressure is too large, pits will be easily formed on the surface of the beryllium sheet.

[0053] In step S4, the beryllium sheet after homogenization sandblasting is cleaned for a second time with an organic solvent, wiped and dried, and then vacuum packaged.

[0054] In some embodiments, the organic solvent is acetone, anhydrous ethanol or kerosene.

[0055] In some embodiments, the beryllium sheet after the second surface cleaning is wiped with a degreasing veil to allow it to dry quickly.

[0056] In this embodiment, the purpose of the second surface cleaning is to remove dust on the surface of the beryllium sheet. After drying, each beryllium sheet is vacuum packed to prevent secondary contamination of the beryllium sheet.

[0057] Example 1 (Φ22*0.8mm beryllium sheet)

[0058] In the first step, the outer diameter of a beryllium rod containing beryllium content ≥ 98.5wt% is turned to a diameter of 22mm, and then cut into beryllium sheets by electric spark wire cutting according to a thickness of 0.85-0.90mm.

[0059] In the second step, according to the preset grinding process, a double-end surface grinder carrying a silicon carbide bonded diamond grinding wheel with a mesh size of 800-1200 is used to grind the surface of the beryllium sheet obtained in the first step; wherein, the applied pressure of the surface grinding is 80 kPa, and the rotation speed of the grinding wheel is 25 r / min.

[0060] The third step is to soak the surface-ground beryllium sheet in acetone for 20-30 minutes for the first surface cleaning, then take out the beryllium sheet after the first surface cleaning, wipe it with a degreased veil and dry it.

[0061] In the fourth step, the beryllium sheet obtained in step S2 is adsorbed on the vacuum suction cup and then placed on the track of the sandblasting machine, and the beryllium sheet is uniformly sandblasted for 1-5 minutes by a sandblasting gun with a swing range of 20-100 mm; wherein the material for uniform sandblasting is glass beads, the mesh size of the glass beads is 100 meshes, the sandblasting pressure of the sandblasting gun is 0.4 MPa, the holding time of the vacuum suction cup is not less than 10 minutes, and the vacuum degree is less than 10 kPa.

[0062] The fifth step is to use anhydrous ethanol to clean the surface of the beryllium sheet after homogenization sandblasting for the second time, wipe it with degreased veil, dry it and then vacuum pack it.

[0063] Example 2 (32.3*5.6*0.8mm beryllium sheet)

[0064] In the first step, a beryllium rod containing beryllium content ≥ 98.5wt% is turned into a rectangular bar of 32.3*5.6mm, and then cut into beryllium sheets by electric spark wire cutting according to a thickness of 0.85-0.90mm.

[0065] In the second step, according to the preset grinding process, a double-end surface grinder carrying a silicon carbide bonded diamond grinding wheel with a mesh size of 800-1200 is used to grind the surface of the beryllium sheet obtained in the first step; wherein, the applied pressure of the surface grinding is 40 kPa, and the rotation speed of the grinding wheel is 40 r / min.

[0066] The third step is to soak the surface-ground beryllium sheet in kerosene for 20-30 minutes for the first surface cleaning, then take out the surface-cleaned beryllium sheet, wipe it with a degreased veil and dry it.

[0067] In the fourth step, the beryllium sheet obtained in step S2 is adsorbed on the vacuum suction cup and then placed on the track of the sandblasting machine, and the beryllium sheet is uniformly sandblasted for 1-5 minutes by a sandblasting gun with a swing range of 20-100 mm; wherein the material for uniform sandblasting is glass beads, the mesh number of the glass beads is 80 meshes, the sandblasting pressure of the sandblasting gun is 0.5 MPa, the holding time of the vacuum suction cup is not less than 10 minutes, and the vacuum degree is less than 10 kPa.

[0068] The fifth step is to use anhydrous ethanol to clean the surface of the beryllium sheet after homogenization sandblasting for the second time, wipe it with degreased veil, dry it and then vacuum pack it.

[0069] Example 3 (Φ22*0.8mm beryllium sheet)

[0070] In the first step, the outer diameter of a beryllium rod containing beryllium content ≥ 98.5wt% is turned to a diameter of 22mm, and then cut into beryllium sheets by electric spark wire cutting according to a thickness of 0.85-0.90mm.

[0071] In the second step, according to the preset grinding process, a double-end surface grinder carrying a silicon carbide bonded diamond grinding wheel with a mesh size of 800-1200 is used to grind the surface of the beryllium sheet obtained in the first step; wherein, the applied pressure of the surface grinding is 120 kPa, and the rotation speed of the grinding wheel is 10 r / min.

[0072] The third step is to immerse the surface-ground beryllium sheet in anhydrous ethanol for 20-30 minutes for the first surface cleaning, then take out the beryllium sheet after the first surface cleaning, wipe it with a degreased veil and dry it.

[0073] In the fourth step, the beryllium sheet obtained in step S2 is adsorbed on the vacuum suction cup and then placed on the track of the sandblasting machine, and the beryllium sheet is uniformly sandblasted for 1-5 minutes by a sandblasting gun with a swing range of 20-100 mm; wherein the material for uniform sandblasting is glass beads, the mesh number of the glass beads is 120 meshes, the sandblasting pressure of the sandblasting gun is 0.3 MPa, the holding time of the vacuum suction cup is not less than 10 minutes, and the vacuum degree is less than 10 kPa.

[0074] The fifth step is to use acetone to clean the surface of the beryllium sheet after homogenization sandblasting for the second time, wipe it with degreased veil, dry it and then vacuum pack it.

[0075] It was observed that the beryllium sheets obtained in Examples 1-3 had matte surfaces and uniform colors.

[0076] After testing, the thickness tolerance of the beryllium sheets obtained in Examples 1-3 is within 0.02 mm.

[0077] In summary, the solution proposed by the present invention has the following technical effects:

[0078] The invention performs surface treatment on the X-ray beryllium sheet through the process of double-end surface grinding and glass bead sandblasting, and has the advantages of high production efficiency, matte surface treatment, uniform color and the like.

[0079] In addition, the method of the present invention can process hundreds of beryllium sheets at the same time, with a thickness tolerance within 0.02 mm, further effectively improving work efficiency and being suitable for industrial production.

[0080] Please note that the technical features of the above embodiments can be combined arbitrarily. In order to make the description concise, all possible combinations of the technical features in the above embodiments are not described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification. The above embodiments only express several implementation methods of the present application, and their descriptions are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that for ordinary technicians in this field, without departing from the concept of the present application, several variations and improvements can be made, which all belong to the scope of protection of the present application. Therefore, the scope of protection of the patent in this application shall be based on the attached claims.

Claims

1. A surface treatment method for X-ray beryllium sheet, characterized in that: The method comprises the following steps: Step S1, grinding the surface of the beryllium sheet using a double-end grinder according to a preset grinding amount; Step S2, immersing the surface-ground beryllium sheet in an organic solvent for a first surface cleaning, then taking out the surface-cleaned beryllium sheet, wiping it, and drying it; Step S3, adsorbing the beryllium sheet obtained in step S2 onto the vacuum suction cup and placing it on the crawler of the sandblasting machine, and performing uniform sandblasting on the beryllium sheet by using a swinging sandblasting gun; Wherein, the material for homogenizing sandblasting is glass beads, and the mesh number of the glass beads is 80-120 mesh; Step S4, using an organic solvent to clean the surface of the beryllium sheet after homogenization sandblasting for a second time, wiping and drying it, and then vacuum packaging it.

2. The surface treatment method of X-ray beryllium sheet according to claim 1, characterized in that: In the step S1, the applied pressure of the surface grinding is 40-120 kPa.

3. The surface treatment method of X-ray beryllium sheet according to claim 1, characterized in that: In the step S1, the grinding wheel used for the surface grinding is a silicon carbide bonded diamond grinding wheel with a mesh size of 800-1200.

4. The surface treatment method of X-ray beryllium sheet according to claim 3, characterized in that: The rotation speed of the grinding wheel is 10-40r / min.

5. The surface treatment method of X-ray beryllium sheet according to claim 1, characterized in that: In the step S2, the soaking time for the first surface cleaning is 20-30 minutes.

6. The surface treatment method of X-ray beryllium sheet according to claim 1, characterized in that: In the step S3, when the beryllium sheet is adsorbed on the vacuum suction cup, the pressure holding time of the vacuum suction cup is not less than 10 minutes, and the vacuum degree of the vacuum suction cup is less than 10 kPa.

7. The surface treatment method of X-ray beryllium sheet according to claim 1, characterized in that: In the step S3, the swing range of the sandblasting gun is 20-100 mm, and the sandblasting pressure of the sandblasting gun is 0.3-0.5 MPa.

8. The surface treatment method of X-ray beryllium sheet according to claim 1, characterized in that: In step S3, the homogenization sandblasting time is 1-5 minutes.

9. The surface treatment method of X-ray beryllium sheet according to claim 1, characterized in that: The organic solvent is acetone, anhydrous ethanol or kerosene.

10. The surface treatment method of X-ray beryllium sheet according to claim 1, characterized in that: Use a degreasing veil to wipe the beryllium sheet after the first surface cleaning and / or the second surface cleaning.

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