Search

CN-122004578-A - Diamond processing method with cross-shaped inside

CN122004578ACN 122004578 ACN122004578 ACN 122004578ACN-122004578-A

Abstract

The invention discloses a diamond processing method with a cross-shaped inside, which comprises the following steps of raw material screening, pretreatment, external modeling processing, internal groove construction, internal cross structure construction, finishing polishing and detection grading. The invention belongs to the technical field of precious stone processing, and particularly provides a diamond processing method which adopts a mode of combining laser micro-engraving and vacuum coating, builds a stable cross refractive index difference structure in a diamond for the first time, has clear and three-dimensional cross shape, is not easy to wear, has controllable process and high yield and is internally provided with a cross shape.

Inventors

  • QIN WEI

Assignees

  • 河南培育钻石研究院有限公司

Dates

Publication Date
20260512
Application Date
20260302

Claims (6)

  1. 1. A method of processing a diamond having a cross-shape in its interior, comprising the steps of: s1, raw material screening, namely selecting a diamond blank with the purity more than or equal to VS1 and the weight more than or equal to 0.3ct, and determining blank raw materials without cracks and impurities inside by a diamond detector; s2, preprocessing, namely primarily cutting the diamond blank, and removing impurity areas to obtain a square or octahedral basic blank; s3, external modeling processing, namely cutting the original diamond according to a preset cut to form a diamond blank with a crown, a waist and a pavilion, wherein the crown comprises a table top and a plurality of crown facets, and the pavilion comprises a plurality of pavilion facets; s4, constructing an internal groove, namely micro-engraving is carried out from the center of the blank body to two ends by adopting pulse laser along the X-axis and Y-axis directions of the basic blank body to form a cross-shaped groove; S5, constructing an internal cross structure, namely depositing a layer of silicon dioxide transparent film on the inner wall of the cross groove by a vacuum coating technology to construct a refractive index difference structure; S6, finishing polishing, namely polishing the external facets of the diamond surface by adopting a diamond powder polishing agent; s7, detecting and grading, namely observing the definition and symmetry of the internal cross shape through a diamond microscope, and finishing the detection of the finished product by combining the color, the purity and the cutting grading standard of the diamond.
  2. 2. The method of diamond machining with cross-shaped inside according to claim 1, wherein the outside cutting in step S3 is performed by using a diamond cutter with a cutting angle of 32-40 DEG and a waist thickness of 0.1-0.3mm.
  3. 3. The method of diamond machining according to claim 1, wherein the laser pulse in step S4 has a wavelength of 532-1064nm and a frequency of 10-50kHz, and the engraving speed is 0.1-0.5mm/S.
  4. 4. The method of claim 1, wherein in step S4, the cross-shaped grooves are two intersecting V-shaped grooves, the included angle between the two V-shaped grooves is 90 DEG, and the extending direction of one V-shaped groove is parallel or perpendicular to the crystal axis direction of the diamond.
  5. 5. The method of claim 1, wherein the vacuum degree of the vacuum coating in the step S5 is 10-3-10-5Pa, the coating temperature is 100-200 ℃, and the refractive index of the silicon dioxide film is 1.45-1.50.
  6. 6. The method of diamond machining according to claim 1, wherein the step S6 is performed at a polishing pressure of 0.1-0.3MPa and a polishing temperature of less than 50deg.C.

Description

Diamond processing method with cross-shaped inside Technical Field The invention belongs to the technical field of precious stone processing, and particularly relates to a diamond processing method with a cross shape inside. Background The value of diamond as the core material of high-end jewelry not only depends on the traditional indexes such as weight, color, purity, cutting work and the like, but also is obviously influenced by personalized appearance design. The key objective of conventional diamond cutting and grinding processes, such as brilliant cutting, is to maximize the brightness, fire and scintillation of the diamond by precisely calculating the angle and scale. However, as the personalized needs of the consumer market grow, shaping the geometry outside of the diamond alone has not been able to meet the needs of the high-end custom market. However, the prior art has mostly used laser to mark the content or specific area of the diamond to form words or simple figures. The existing diamond internal structure processing technology is mainly focused on internal texture modification or defect repair, and is difficult to form a precise and stable cross structure inside. The diamond has extremely high hardness, the traditional machining cannot carry out fine modeling internally, and the internal structure is matched with the external section to show clear visual effect. The prior art lacks a technical scheme of the cooperative design of the two, so that the internal cross shape is easy to blur and has poor symmetry, and the market demand for personalized diamonds is difficult to meet. Therefore, there is an urgent need for a new diamond processing method in which the inside of the diamond presents a cross shape to solve the above-mentioned problems. Disclosure of Invention In order to solve the existing problems, the invention provides a diamond processing method which adopts a mode of combining laser micro-engraving and vacuum coating, builds a stable cross refractive index difference structure in the diamond for the first time, has clear and three-dimensional cross shape, is not easy to wear, has controllable process and high yield and presents a cross shape in the diamond. The technical scheme adopted by the invention is that the diamond processing method with the cross shape inside comprises the following steps: s1, raw material screening, namely selecting a diamond blank with the purity more than or equal to VS1 and the weight more than or equal to 0.3ct, and determining blank raw materials without cracks and impurities in the diamond blank by a diamond detector, so as to avoid cracking or shielding a cross structure in the processing process; S2, preprocessing, namely primarily cutting the diamond blank, removing impurity areas to obtain a square or octahedral basic blank body, and ensuring enough allowance for subsequent internal engraving and external processing; s3, external modeling processing, namely cutting the original drill by a diamond cutter according to a preset cut, wherein the cutting angle is 32-40 degrees to form a diamond blank with a crown part, a waist part and pavilion parts, the crown part comprises a table top and a plurality of crown part facets, the thickness of the waist part is 0.1-0.3mm, and the pavilion part comprises a plurality of pavilion part facets, so that the external facets can guide light rays into the interior accurately; S4, constructing an internal groove, namely adopting pulse laser with the wavelength of 532-1064nm and the frequency of 10-50kHz to carry out micro-engraving with the speed of 0.1-0.5mm/S along the X-axis and Y-axis directions of a basic blank body from the center of the blank body to two ends to form a cross-shaped groove, wherein the cross-shaped groove is two crossed V-shaped grooves, the included angle of the two V-shaped grooves is 90 degrees, and the extending direction of one V-shaped groove is parallel or perpendicular to the direction of a certain crystal axis of the diamond, so that the light reflection effect is improved; s5, constructing an internal cross structure, namely depositing a layer of silicon dioxide transparent film on the inner wall of the cross groove by a vacuum coating technology, constructing a refractive index difference structure, wherein the vacuum degree of vacuum coating is 10 < -3 > -10 < -5 > Pa, the coating temperature is 100-200 ℃, the refractive index of the silicon dioxide film is 1.45-1.50, and the refractive index difference of silicon dioxide and diamond is utilized to enhance the visual contrast of the cross; S6, finishing polishing, namely polishing the external facets of the diamond surface by adopting a diamond powder polishing agent, wherein the polishing pressure is 0.1-0.3MPa, the polishing temperature is lower than 50 ℃, and the influence of high temperature on the stability of an internal film is avoided; S7, detecting and grading, namely observing the definition and symmetry of the internal