A surface treatment method for CNC cutting tools

Abstract

The invention discloses a surface treatment method for a numerical control tool, and belongs to the field of surface treatment technology; the method comprises the following steps: the numerical control tool is sequentially subjected to dry ice particle jet cleaning and hot air drying; the particle size of the dry ice particles is 100 μm to 600 μm. The method of the invention uses dry ice particles to rapidly freeze dirt, oil stains, and residual impurities on the surface of the tool, thereby condensing, embrittlement, and peeling, and finally removing them with the airflow. The purpose of deep cleaning the surface and optimizing surface defects is achieved. At the same time, the dry ice jet particles have a micro-blasting effect, and also have a certain rounding and polishing effect on the tool cutting edge; and hot air drying solves the problem that the instantaneous temperature difference on the surface is too large during dry ice treatment, resulting in condensed water adhering to the surface, thereby making the surface Co component unstable.

Description

Technical Field

[0001] The invention belongs to the technical field of surface treatment, and in particular relates to a surface treatment method for a numerical control tool. Background Art

[0002] Depositing hard coatings on the surface of CNC tools is an important way to improve the cutting performance of tools. Surface morphology is an important feature of the coating because it determines its functional performance in many applications. The large number of defects on the surface of CNC tools will reduce the quality of the coating, causing product quality problems and reducing the performance and reliability of CNC tools. In the cutting application process, they may even lead to catastrophic failure of cutting, making the tool coating prone to peeling and chipping, thereby exacerbating the rapid failure of the tool, and the processing efficiency and quality are also reduced, and the true performance of the CNC tool material cannot be fully utilized. Therefore, ensuring the stability of product quality performance is a huge challenge for industrial production.

[0003] During the deposition and growth of the coating, all morphological features on the surface of the tool substrate will be copied and transferred to the coating surface, and even magnified. Due to the shadow deposition effect, the defects on the surface of the tool substrate will be magnified. Even relatively small defects of tens of nanometers will grow into large defects at the micron level on the surface of the film. The related art points out that the defects on the microscopic scale of the coating have their potential sources of defects. The most common sources of defects are caused by the surface in-situ defects of the substrate (pits, rough surfaces, composition changes) or excessive growth of foreign particles on the surface (dust, debris, flakes). Such defective particles are caused by the pretreatment process during the preparation of the tool substrate surface before coating. The specific substrate pretreatment includes: mechanical pretreatment (grinding, sandblasting, polishing), wet chemical cleaning (ultrasonic cleaning, hydrocarbon cleaning). Mechanical pretreatment will produce surface morphological defects such as "orange peel", "pitting", residual sand and irregular surface; wet chemical cleaning will cause component defects such as cobalt loss pits, residual adhesion of cleaning agents and corrosion morphology. As a result, defects are nucleated during the coating deposition process, and a large number of defects of varying sizes grow, resulting in performance defects of coated tools. Therefore, the quality, composition and morphology of the tool substrate surface before coating will directly affect the performance of the coated tool.

[0004] In summary, it is necessary to provide a surface treatment method for a CNC tool to solve at least one aspect of the problems and defects raised in the above background technology. Summary of the invention

[0005] The object of the present invention is to provide a surface treatment method for a numerically controlled tool to solve at least one aspect of the problems and defects raised in the above-mentioned background technology.

[0006] Specifically, the present invention provides a method for surface treatment of a numerical control tool, comprising the following steps:

[0007] The CNC tool is sequentially cleaned by dry ice particle blasting and dried by hot air;

[0008] The particle size of the dry ice particles is 100 μm to 600 μm.

[0009] According to one technical solution of the surface treatment method of the present invention, at least the following beneficial effects are achieved:

[0010] In the treatment method of the present invention, dry ice particle blasting cleaning uses low-temperature dry ice to condense and embrittle the surface attachments at low temperatures. The dry ice instantly vaporizes to produce hundreds of times the expanded gas to strip off the pollutants, and the size of the dry ice particles is controlled to form a micro-blasting effect on the surface, further removing various forms of inlaid types and strongly attached residues. And the micro-blasting effect also has a certain rounding and polishing effect on the cutting edge of the tool without causing additional damage. The blade edge after such treatment has a more stable and regular shape, and the performance of the tool is significantly improved. More importantly, many tool substrates contain the bonding phase Co element, which is easy to cause cobalt loss when in contact with water, and long-term exposure to air will cause cobalt oxidation. The dry ice particle blasting process is water-free, reducing the negative impact caused by this problem.

[0011] The use of hot air drying solves the problem that when the temperature of the treated surface drops below 0°C after dry ice cleaning, the water vapor in the air will form an ice layer or condensed water on the surface of the substrate, causing dust particles to stick to the surface and unstable Co composition. The substrate is dried in pure hot air, which can supplement and solve the shortcomings of dry ice particle blasting cleaning and play a synergistic role. It ensures deep cleaning of the surface and stable surface composition of the substrate without causing secondary pollution to the surface.

[0012] In the present invention, by surface treating the CNC tool, an excellent combination of the film base is achieved, and the CNC tool material can achieve the ideal state of strong, tough and wear-resistant integration. The tool surface before coating is treated by combining "dry ice particle jet cleaning + pure hot air drying", which further deeply cleans various forms of residual impurities on the tool surface in the deep processing step, while ensuring the freshness and stable composition of the tool grinding material surface, achieving the purpose of optimizing surface defects, thereby ensuring excellent film base bonding. This method is simple and effective, and helps to achieve the stability of product quality and performance in large-scale industrial production.

[0013] According to some embodiments of the present invention, the particle size of the dry ice particles is 100 μm to 300 μm.

[0014] According to some embodiments of the present invention, the pressure of the dry ice particle spraying is above 5 MPa.

[0015] According to some embodiments of the present invention, the pressure of the dry ice particle spraying is above 6 MPa.

[0016] According to some embodiments of the present invention, the pressure of the dry ice particle spraying is between 5 MPa and 20 MPa.

[0017] According to some embodiments of the present invention, the spraying angle of the dry ice particles is 20° to 70°.

[0018] According to some embodiments of the present invention, the spraying angle of the dry ice particles is 30° to 60°.

[0019] According to some embodiments of the present invention, the spraying angle of the dry ice particles is 40° to 50°.

[0020] According to some embodiments of the present invention, the spraying angle of the dry ice particles is 40° to 45°.

[0021] According to some embodiments of the present invention, the spray cleaning time per unit point during the dry ice particle spraying process is 3s to 5s.

[0022] According to some embodiments of the present invention, the spray cleaning time of the CNC tool dry ice particle spraying is 1 min to 2 min.

[0023] According to some embodiments of the present invention, the dry ice particle blasting process of the CNC tool is as follows:

[0024] The spray cleaning time of dry ice particle jet cleaning a blade surface site is 3s to 5s. After cleaning a blade site, the dry ice jet nozzle moves to the next blade surface site in sequence until the cleaning of the entire CNC tool beam is completed. The time is 1min / blade to 2min / blade.

[0025] According to some embodiments of the present invention, the distance between the nozzle and the CNC tool during the dry ice particle blasting process is 3 cm to 10 cm.

[0026] According to some embodiments of the present invention, the hot air drying temperature is 120°C to 170°C.

[0027] According to some embodiments of the present invention, the hot air drying time is 100s to 200s.

[0028] According to some embodiments of the present invention, the hot air drying time is 150 seconds.

[0029] According to some embodiments of the present invention, the hot air drying is performed by hot air circulation drying in a closed drying box.

[0030] According to some embodiments of the present invention, the hot air is provided to the closed drying box by a blower, and the blown hot air passes through an air filter to purify dust and moisture in the air.

[0031] According to some embodiments of the present invention, the CNC tool is a cutting tool.

[0032] According to some embodiments of the present invention, the cutting tool is one of an indexable insert and a solid tool.

[0033] According to some embodiments of the present invention, the indexable insert includes one of a milling cutter, a turning tool, a threading cutter, a slotting cutter and a down-the-hole drill.

[0034] According to some embodiments of the present invention, the integral tool includes one of an end mill, a drill, a tap and die, a tool rod and a welding tool.

[0035] According to some embodiments of the present invention, the CNC tool is required to be stored in a clean constant temperature and humidity environment after hot air drying.

[0036] According to some embodiments of the present invention, the temperature in the constant temperature and humidity environment is 20°C to 25°C.

[0037] According to some embodiments of the present invention, the temperature in the constant temperature and humidity environment is 22°C.

[0038] According to some embodiments of the present invention, the humidity in the constant temperature and humidity environment is 30% to 40%.

[0039] According to some embodiments of the present invention, the humidity in the constant temperature and humidity environment is 36%.

[0040] Minimize re-contamination of tool abrasive surfaces prior to placement in the deposition chamber.

[0041] According to some embodiments of the present invention, the grinding material of the CNC tool includes at least one of high-speed steel, metal ceramic and cubic boron nitride hard material.

[0042] According to some embodiments of the present invention, mechanical pretreatment and wet cleaning are performed before the dry ice particle blasting cleaning.

[0043] According to some embodiments of the present invention, the mechanical pretreatment is grinding and sandblasting.

[0044] According to some embodiments of the present invention, the grinding is performed in a planetary double-sided mill.

[0045] According to some embodiments of the present invention, the mesh number of the wheel grinding selected for the planetary double-sided grinding mill is 50-100 meshes.

[0046] According to some embodiments of the present invention, the planetary double-sided grinding mill uses a grinding wheel with a mesh size of 80 meshes.

[0047] According to some embodiments of the present invention, the grinding wheel is a 80-mesh green carbon grinding wheel.

[0048] According to some embodiments of the present invention, white corundum sand is used for sand blasting.

[0049] According to some embodiments of the present invention, the sandblasting is performed using 200 mesh and 400 mesh white corundum sand in sequence.

[0050] According to some embodiments of the present invention, the sandblasting time is 20 min to 30 min.

[0051] According to some embodiments of the present invention, the sandblasting time of 200 mesh white corundum is 10 min to 15 min.

[0052] According to some embodiments of the present invention, the sandblasting time of 400 mesh white corundum is 10 min to 15 min.

[0053] According to some embodiments of the present invention, the wet cleaning is cleaning with an alkaline cleaning agent.

[0054] According to some embodiments of the present invention, the wet cleaning time is 50 min to 70 min.

[0055] According to some embodiments of the present invention, the mass fraction of cobalt in the treated CNC tool is above 7.1%.

[0056] According to some embodiments of the present invention, the mass fraction of cobalt in the treated CNC tool is above 7.5%.

[0057] According to some embodiments of the present invention, the mass fraction of cobalt in the treated CNC tool is above 8.0%.

[0058] The surface treatment method of the present invention achieves deep cleaning of the surface of the CNC tool, making the surface defects of the CNC tool less. At the same time, it ensures that the surface of the substrate of the tool is fresh and the composition is stable. This solves the current situation and problem of unstable performance and quality of CNC tools in large-scale production.

[0059] The present invention performs a surface treatment of "dry ice particle blasting cleaning + pure hot air drying" on the CNC tool in deep processing before coating; through the dry ice particle blasting technology, dry ice particles with a particle size of 100μm to 600μm are sprayed onto the tool surface at a certain high pressure and angle. The dry ice particles quickly freeze the dirt, oil stains, and residual impurities on the tool surface, thereby condensing, embrittlement, and peeling, and finally being removed with the airflow. BRIEF DESCRIPTION OF THE DRAWINGS

[0060] In order to facilitate understanding by those skilled in the art, the present invention is further described below with reference to the accompanying drawings.

[0061] Figure 1 Schematic diagram of overall and microscopic defects of the abrasive products of Example 1 and Comparative Examples 1 to 3 of the present invention.

[0062] Figure 2 Schematic diagram of the fracture cross-sectional morphology and surface defects of the coatings of Example 2 of the present invention and Comparative Examples 4-5. DETAILED DESCRIPTION

[0063] The following will be combined with the embodiments to clearly and completely describe the concept of the present invention and the technical effects produced, so as to fully understand the purpose, characteristics and effects of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, other embodiments obtained by those skilled in the art without creative work are all within the scope of protection of the present invention.

[0064] In the description of the present invention, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0065] If the specific conditions are not specified in the examples, the experiments were carried out under conventional conditions or conditions recommended by the manufacturer. If the manufacturers of the reagents or instruments are not specified, they are all conventional products that can be purchased commercially.

[0066] In the embodiment of the present invention, the CNC tool selected is model RPMT1204MO-FM and a 20mm (length) × 8mm (width) × 6mm (height) alloy strip sample (the alloy strip and the CNC tool are both made by powder metallurgy, and the cemented carbide matrix consists of WC hard phase and Co bonding phase, and the material is specifically selected as K40 matrix grade), and the cemented carbide blank is made by rapid cooling and sintering.

[0067] Example 1

[0068] This embodiment is a surface treatment method for a numerical control tool, which comprises the following steps:

[0069] The CNC tools are sequentially subjected to mechanical pretreatment, wet cleaning, dry ice particle blasting cleaning and hot air drying.

[0070] The CNC tool in this embodiment is RPMT1204MO-FM.

[0071] In this embodiment, the mechanical pretreatment includes grinding and sand blasting.

[0072] In this step, the grinding is to grind the reference surface of the tool blank using a planetary double-sided grinding device with an 80-mesh green carbon grinding wheel, and grind the tool edge with a peripheral grinder;

[0073] In this step, the sandblasting is performed by using 200 mesh and 400 mesh white corundum sand, respectively, using a step-by-step sandblasting line and a rotary sandblasting machine to blast the surface of the sintered tool blank and control the edge size. The sandblasting time is 10 minutes (200 mesh) and 10 minutes (400 mesh), respectively.

[0074] In this step, the wet cleaning adopts the alkaline metal cleaning agent of Vacukleen series of NGL company, and the cleaning time is 60 minutes.

[0075] The parameters of dry ice particle spraying in this embodiment are as follows:

[0076] The particle size range of dry ice particles is 100μm~300μm, the spray pressure is 5Mpa, the spray angle is 45° to the surface, the distance between the nozzle and the surface of the object to be cleaned is between 5cm, and the spray cleaning time of dry ice spray cleaning a blade surface site is 5s. After cleaning a blade site, the dry ice jet nozzle moves to the next blade surface site in turn until the cleaning of the entire CNC tool beam is completed, and the time is 2min / root.

[0077] In this embodiment, the hot air drying step is: hot air circulation drying is performed in a closed drying box. Hot air is provided to the closed drying box by a blower, and the blown hot air passes through an air filter to purify dust and moisture in the air.

[0078] In this embodiment, the CNC tool after hot air drying is stored in a constant temperature (22° C.) and constant humidity (36%) environment.

[0079] In this embodiment, the CNC tool is replaced with a 20 mm (length) × 8 mm (width) × 6 mm (height) alloy strip sample (K40 matrix grade) for the above-mentioned surface treatment.

[0080] The overall and microscopic morphology of the surface of the CNC tool RPMT1204MO-FM and the alloy strip sample grinding product in this embodiment are shown in the figure. Figure 1 As shown in (a).

[0081] Example 2

[0082] This embodiment is a method for preparing a coating, which consists of the following steps:

[0083] The CNC tool and the alloy strip sample abrasive product after the surface treatment in Example 1 were respectively coated with AlTiN coating.

[0084] The coating method is: using arc ion plating to coat the AlTiN hard coating.

[0085] The schematic diagram of the surface morphology of the RPMT1204MO-FM coating of the CNC tool in this embodiment and the cross-sectional morphology of the alloy strip coating fracture is shown in FIG. Figure 2 As shown in (b).

[0086] Comparative Example 1

[0087] This comparative example is a CNC tool surface treatment method, which consists of the following steps:

[0088] The CNC tools are mechanically pre-treated in sequence.

[0089] The CNC tool in this comparative example is RPMT1204MO-FM.

[0090] The mechanical pretreatment in this comparative example is grinding and sandblasting.

[0091] In this comparative example, the grinding is to grind the reference surface of the tool blank using a planetary double-sided grinding device with an 80-mesh green carbon grinding wheel, and the tool edge is sharpened by a peripheral grinder;

[0092] In this comparative example, 200-mesh and 400-mesh white corundum sand were used for sandblasting, and a step-type sandblasting line and a rotary sandblasting machine were used to blast and remove sand and control the size of the cutting edge on the surface of the sintered tool blank. The sandblasting time was 10 minutes and 10 minutes respectively.

[0093] In this comparative example, the CNC tool is replaced with a 20 mm (length) × 8 mm (width) × 6 mm (height) alloy strip sample (K40 matrix grade) for the above-mentioned surface treatment.

[0094] The overall and microscopic morphology of the surface of the CNC tool RPMT1204MO-FM and the alloy strip sample in this comparative example are shown in the figure. Figure 1 As shown in (c).

[0095] The surface of the abrasive product has Al2O3 embedded and residual surface defects after dry sandblasting.

[0096] Comparative Example 2

[0097] This comparative example is a CNC tool surface treatment method, which consists of the following steps:

[0098] The CNC tools are sequentially subjected to mechanical pretreatment and wet ultrasonic cleaning.

[0099] The CNC tool in this comparative example is RPMT1204MO-FM.

[0100] The mechanical pretreatment in this comparative example is grinding and sandblasting.

[0101] In this comparative example, the grinding is to grind the reference surface of the tool blank using a planetary double-sided grinding device with an 80-mesh green carbon grinding wheel, and the tool edge is sharpened by a peripheral grinder;

[0102] In this comparative example, 200-mesh and 400-mesh white corundum sand were used for sandblasting, and a step-type sandblasting line and a rotary sandblasting machine were used to blast and remove sand and control the size of the cutting edge on the surface of the sintered tool blank. The sandblasting time was 10 minutes and 10 minutes respectively.

[0103] The parameters of wet ultrasonic cleaning in this comparative example are as follows:

[0104] The time is 70 minutes, the ultrasonic power is 300W, and the cleaning agent is an alkaline special cleaning agent (NGL company's Vacukleen series of alkaline metal cleaning agents).

[0105] In this comparative example, the CNC tool is replaced with a 20 mm (length) × 8 mm (width) × 6 mm (height) alloy strip sample (K40 matrix grade) for the above-mentioned surface treatment.

[0106] The overall and microscopic morphology of the surface of the CNC tool RPMT1204MO-FM and the alloy strip sample in this comparative example are shown in the figure. Figure 1 As shown in (d).

[0107] In this comparative example, the surface of the ground product has the defect of Co vacancy on the surface due to Co loss caused by excessive cleaning.

[0108] Comparative Example 3

[0109] This comparative example is a CNC tool surface treatment method, which consists of the following steps:

[0110] The CNC tools are subjected to mechanical pretreatment and hydrocarbon cleaning in sequence.

[0111] The CNC tool in this comparative example is RPMT1204MO-FM.

[0112] The mechanical pretreatment in this comparative example is grinding and sandblasting.

[0113] In this comparative example, the grinding is to grind the reference surface of the tool blank using a planetary double-sided grinding device with an 80-mesh green carbon grinding wheel, and the tool edge is sharpened by a peripheral grinder;

[0114] In this comparative example, 200-mesh and 400-mesh white corundum sand were used for sandblasting, and a step-type sandblasting line and a rotary sandblasting machine were used to blast and remove sand and control the size of the cutting edge on the surface of the sintered tool blank. The sandblasting time was 10 minutes and 10 minutes respectively.

[0115] The parameters of hydrocarbon cleaning in this comparative example are as follows:

[0116] Hydrocarbon cleaning agent (carbon ash removal type hydrocarbon cleaning agent, product model is HX1760), cleaning time is 15 minutes.

[0117] In this comparative example, the CNC tool is replaced with a 20 mm (length) × 8 mm (width) × 6 mm (height) alloy strip sample (K40 matrix grade) for the above-mentioned surface treatment.

[0118] The overall and microscopic morphology of the surface of the CNC tool RPMT1204MO-FM and the alloy strip sample in this comparative example are shown in the figure. Figure 1 As shown in (e).

[0119] In this comparative example, hydrocarbon cleaning liquid remains on the surface of the abrasive product, resulting in surface inorganic adhesion defects.

[0120] Comparative Example 4

[0121] This comparative example is a method for preparing a coating, which consists of the following steps:

[0122] The surface-treated CNC tool and alloy strip sample grinding product in Comparative Example 2 were respectively coated with AlTiN coating.

[0123] The coating method is: using arc ion plating to coat the AlTiN hard coating.

[0124] The schematic diagram of the surface morphology of the RPMT1204MO-FM coating of the CNC tool in this comparative example and the cross-sectional morphology of the alloy strip coating fracture is shown in the figure. Figure 2 As shown in (f).

[0125] In this comparative example, the Co loss in the coating is serious, which is manifested in poor adhesion between the substrate and the coating and coating peeling.

[0126] Comparative Example 5

[0127] This comparative example is a method for preparing a coating, which consists of the following steps:

[0128] The surface-treated CNC tool and alloy strip abrasive product in Comparative Example 3 were respectively coated with AlTiN coating.

[0129] The coating method is: using arc ion plating to coat the AlTiN hard coating.

[0130] The schematic diagram of the surface morphology of the RPMT1204MO-FM coating of the CNC tool in this comparative example and the cross-sectional morphology of the alloy strip coating fracture is shown in the figure. Figure 2 As shown in (g).

[0131] The coating morphology with severe embedding of abrasives and residual sand in this comparative example is characterized by tiny sand as a defect factor, and the shadow deposition effect of the coating will amplify the defects on the surface of the tool substrate.

[0132] like Figure 1 As shown, it can be seen from the overall and microscopic defect schematic diagrams of the abrasive products of Example 1 and Comparative Examples 1 to 3 of the present invention that, compared with the surface treatment method of "dry ice particle blasting cleaning + pure hot air drying" combined in Example 1. Comparative Examples 1 to 3 are subjected to a series of mechanical post-processing and subsequent process treatments to obtain tool substrates and alloy strip-like abrasive products. In the deep processing processes such as sandblasting, hydrocarbon cleaning, and grinding, Comparative Example 1 has common surface foreign particle defect sources such as sand residue and embedding after sandblasting; Comparative Examples 2 to 3 have surface in-situ defect problems such as cobalt pits formed by excessive cleaning after ultrasonic cleaning or hydrocarbon cleaning, inorganic residue adhesion and corrosion morphology of hydrocarbon cleaning agents, etc. It is therefore known that in large-scale industrial production, various defect sources caused by the surface of the substrate can be reduced by a surface treatment method combining "dry ice particle blasting cleaning + pure hot air drying" to improve the quality of the surface of the tool substrate before coating.

[0133] like Figure 2 As shown, through the cross-sectional morphology of the coatings of comparative examples 4 to 5 and embodiment 2 of the present invention and the schematic diagram of defects on the coating surface, it can be seen that, relative to embodiment 2, the surface treatment before coating adds a treatment method combining "dry ice particle blasting cleaning + pure hot air drying", and the film-base bonding performance is better, and the surface coating is complete. Comparative Example 4 is a coating morphology with severe Co loss, which is manifested by poor bonding between the substrate and the coating, and coating peeling. Comparative Example 5 is a coating morphology with severe sand embedding and residue, which is manifested by tiny sand as a defect factor, and the shadow deposition effect of the coating will amplify the defects on the surface of the tool substrate. It shows that a large number of defects on the surface before coating will reduce the quality of the coating, thereby causing product quality problems, and also reducing the performance and reliability of CNC tools. At the same time, it is verified that the surface treatment method combining "dry ice particle blasting cleaning + pure hot air drying" reduces the existence of defect sources and improves the quality of the film-base bonding of coated CNC tools.

[0134] The surfaces of the polished strip samples of the alloys of Comparative Examples 1 to 3 and Example 1 were visualized and photographed using a ZEISS Sigma 300 / 500 field emission scanning electron microscope. NThe SDD spectrometer was used to measure the energy spectrum of the components. In order to ensure the accuracy of the measurement results, the average value was taken at 5 points on the surface of the sample to be tested and the results are shown in Table 1.

[0135] Table 1 Energy spectrum measurement results of scanning electron microscope on the surface of the polished products of Comparative Examples 1 to 3 and Example 1

[0136]

[0137]

[0138] As shown in Table 1: the energy spectrum measurement results of the scanning electron microscope on the surfaces of the polished products of Comparative Examples 1 to 3 and Example 1, it can be seen that compared with Example 1, surface defect sources appeared on the surfaces of Comparative Examples 1 to 3 in the deep processing steps such as sandblasting, hydrocarbon cleaning, and grinding.

[0139] In Comparative Example 1, the atomic ratios of Al and O are 6.3% and 6.3%, respectively, which corresponds to the surface foreign particle defect sources such as sand residue and embedding after sandblasting, explaining Figure 1 (c) and Figure 2 Middle (g) morphology.

[0140] In Comparative Example 2, the atomic ratios of Co and O are 0.7% and 0.5%, respectively, indicating that the surface Co loss is very serious and Co vacancies are the source of in-situ defects on the surface, confirming that Figure 1 Middle (d) and Figure 2 Middle (f) morphology.

[0141] In Comparative Example 3, the Cl atomic ratio is 5.2%, indicating the surface in-situ defect problem of surface inorganic residue adhesion and corrosion morphology, corresponding to Figure 1 The morphology of (e).

[0142] A large number of defects on the surface of the tool substrate will reduce the quality of the coating, thus causing product quality problems and reducing the performance and reliability of the CNC tool. In the cutting application process, it may even lead to catastrophic failure of the cutting, making the tool coating prone to peeling, chipping, etc., which aggravates the rapid failure of the tool, and the processing efficiency and quality are also reduced, and the true performance of the CNC tool material cannot be fully utilized. The present invention emphasizes the importance of tool surface quality, and verifies that the surface treatment method combining "dry ice particle jet cleaning + pure hot air drying" is an effective means to solve the problem of unstable product quality and performance.

[0143] In summary, in the treatment method of the present invention, dry ice particle blasting cleaning uses low-temperature dry ice to condense and embrittle the surface attachments at low temperature, and the dry ice instantly vaporizes to produce hundreds of times of expanded gas to strip off the pollutants, and controls the size of dry ice particles to form a micro-blasting effect on the surface, further removing various forms of inlay types and strongly attached residues. And the micro-blasting effect also has a certain rounding and polishing effect on the cutting edge of the tool without causing additional damage. The blade after treatment has a more stable and regular shape, and the performance of the tool is significantly improved. More importantly, many tool substrates contain the bonding phase Co element, which is easy to cause cobalt loss when it encounters water, and cobalt oxidation will occur when exposed to air for a long time. The dry ice particle blasting process is free of water, which reduces the negative impact caused by this problem. The matching use of hot air drying solves the problem that when the temperature of the treated surface drops below 0°C after dry ice cleaning, the water vapor in the air will have an ice layer on the surface of the substrate or condensed water will be generated and attached, resulting in dust particles sticking to the surface and unstable Co components. The substrate is circulated and dried in pure hot air, which can supplement and solve the shortcomings of dry ice particle blasting cleaning and play a synergistic role. It ensures deep surface cleaning and stable surface composition of the substrate without causing secondary pollution to the surface. In the present invention, by surface treatment of the CNC tool, an excellent combination of the membrane and the base is achieved, so that the CNC tool material can reach the ideal state of strong, tough and wear-resistant integration. The tool surface before coating is treated by combining "dry ice particle jet cleaning + pure hot air drying", which further deeply cleans various forms of residual impurities on the tool surface in the deep processing step, while ensuring the freshness and stable composition of the tool grinding material surface, achieving the purpose of optimizing surface defects, thereby ensuring excellent membrane-base bonding. This method is simple and effective, and helps to achieve the stability of product quality and performance in large-scale industrial production.

[0144] The specific embodiments described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for surface treatment of a CNC tool, characterized in that: The following steps are involved: The CNC tool is sequentially cleaned by dry ice particle blasting and dried by hot air; The particle size of the dry ice particles is 100 μm to 300 μm; The pressure of the dry ice particle spraying is above 5MPa; The base material of the numerical control tool contains a bonding phase; The binder phase contains cobalt element; The cleaning time per unit point during the dry ice particle spraying process is 3s~5s; The hot air drying temperature is 120°C to 170°C.

2. The surface treatment method of a numerical control tool according to claim 1, characterized in that: The spraying angle of the dry ice particles is 20° to 70°.

3. The surface treatment method of a numerical control tool according to claim 1, characterized in that: The hot air drying time is 100s to 200s.

4. The surface treatment method of a numerical control tool according to claim 1, characterized in that: The hot air is purified by an air filter.

5. The surface treatment method of a numerical control tool according to claim 1, characterized in that: The numerically controlled tool is a cutting tool.

6. The surface treatment method of a numerical control tool according to claim 5, characterized in that: The cutting tool is one of a transfer insert and an integral tool.

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