Forming method of conductive ceramic cutter

Abstract

The invention relates to the technical field of ceramic cutter machining, in particular to a forming method of a conductive ceramic cutter, which comprises the following steps of: comprehensively optimizing the manufacturing process of the conductive ceramic cutter, accurately proportioning high-performance raw materials, strengthening pretreatment to improve the purity and the uniformity of the materials, and accurately pressing and forming to ensure the quality of a cutter blank. And then, a high-temperature sintering process promotes densification of the material and enhances wear resistance and impact resistance. Fine machining not only improves the surface smoothness of the cutter, but also particularly protects the conductive layer. Through a series of improvement measures, the hardness, toughness, wear resistance, conductivity and overall performance of the conductive ceramic cutter are remarkably improved, the conductive ceramic cutter can better adapt to the complex machining environment, the production efficiency and the machining quality are improved, meanwhile, the service life of the cutter is greatly prolonged, and therefore the problem that an existing conductive ceramic cutter is short in service life is solved.

Description

Technical Field

[0001] The invention relates to the technical field of ceramic tool processing, and in particular to a forming method of a conductive ceramic tool. Background Art

[0002] Cutting processing occupies an important position in the field of mechanical processing. It is the most basic and reliable processing method. The performance of the tool is one of the determining factors affecting cutting efficiency, accuracy, surface quality, etc. The tool material is the most important factor affecting cutting technology.

[0003] Ceramic tools have gradually replaced traditional carbide tools due to their high hardness, corrosion resistance, wear resistance and high temperature resistance, and are increasingly widely used. Compared with traditional carbide tools, the main disadvantage of ceramic tools is that they have poor bending strength and fracture toughness. When the cutting temperature changes, cracks are easily generated, which reduces the service life of conductive ceramic tools. Summary of the invention

[0004] The purpose of the present invention is to provide a method for forming a conductive ceramic tool, aiming to solve the problem of low service life of existing conductive ceramic tools.

[0005] To achieve the above object, the present invention provides a method for forming a conductive ceramic tool, comprising the following steps:

[0006] Weighing zirconium oxide, yttrium oxide, rare earth oxide, binder and conductive material according to preset amounts to obtain initial raw materials;

[0007] Pre-treating the initial raw material to obtain a mixed raw material;

[0008] Putting the mixed raw material into a mold and pressing it to obtain a knife blank;

[0009] Sintering the blade blank to obtain a semi-finished product;

[0010] The semi-finished product is processed to obtain a conductive ceramic tool.

[0011] Among them, in “weighing zirconium oxide, yttrium oxide, rare earth oxide, binder and conductive material according to preset amounts”, the amount of zirconium oxide is 80-95 parts, the amount of yttrium oxide is 3-7 parts, the amount of rare earth oxide is 4-6 parts, the amount of binder is 0-5 parts, and the amount of conductive material is 20-40 parts.

[0012] Wherein, “pre-treating the initial raw material to obtain a mixed raw material” includes:

[0013] Drying the zirconium oxide, the yttrium oxide, the rare earth oxide and the conductive material;

[0014] Ball-milling and screening the dried zirconium oxide, yttrium oxide, rare earth oxide and conductive material to obtain raw materials;

[0015] The binder is added into the raw material for granulation to obtain a mixed raw material.

[0016] Wherein, in “drying the zirconium oxide, the yttrium oxide, the rare earth oxide and the conductive material”, the drying temperature is 80°C-120°C.

[0017] Among them, the step of “putting the mixed raw material into a mold and pressing it to obtain a knife blank” includes:

[0018] Select the corresponding mold based on the knife drawing;

[0019] Putting the mixed raw material into the mold and pressing it at a preset temperature;

[0020] The pressed mixed raw material is cooled and then taken out to obtain a blade blank.

[0021] Wherein, in “placing the mixed raw material into the mold and pressing at a preset temperature”, the preset temperature is 1200°C-1800°C.

[0022] Among them, “sintering the blade blank to obtain a semi-finished product” includes:

[0023] Preheating the sintering furnace;

[0024] The blade blank is placed in a preheated sintering furnace and sintered at 1100° C.-1600° C. for 1.5 h-3 h, and kept warm for 1.5 h-2.5 h to obtain a semi-finished product.

[0025] A forming method of a conductive ceramic tool of the present invention comprises the following steps: weighing zirconium oxide, yttrium oxide, rare earth oxide, binder and conductive material according to preset amounts to obtain initial raw materials; pre-treating the initial raw materials to obtain mixed raw materials; placing the mixed raw materials into a mold for pressing to obtain a knife blank; sintering the knife blank to obtain a semi-finished product; and processing the semi-finished product to obtain a conductive ceramic tool. The method comprehensively optimizes the manufacturing process of the conductive ceramic tool, accurately proportions high-performance raw materials, strengthens pretreatment to improve the purity and uniformity of the materials, and then accurately presses and forms to ensure the quality of the knife blank. Subsequently, the high-temperature sintering process promotes the densification of the material and enhances the wear resistance and impact resistance. Fine processing not only improves the surface finish of the tool, but also pays special attention to protecting the conductive layer. This series of improvement measures significantly improves the hardness, toughness, wear resistance, conductivity and overall performance of the conductive ceramic tool, making it more adaptable to complex processing environments, improving production efficiency and processing quality, and greatly extending the service life of the tool, thereby solving the problem of low service life of the existing conductive ceramic tool. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 The present invention is a flowchart of a method for forming a conductive ceramic tool.

[0028] Figure 2 This is a flow chart of pretreating the initial raw materials to obtain mixed raw materials.

[0029] Figure 3 The present invention is a flow chart of putting the mixed raw material into a mold and pressing it to obtain a knife blank.

[0030] Figure 4 This is a flow chart of sintering the blade blank to obtain a semi-finished product. DETAILED DESCRIPTION

[0031] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0032] See also Figures 1 to 4The present invention provides a method for forming a conductive ceramic tool, comprising the following steps:

[0033] S1: weighing zirconium oxide, yttrium oxide, rare earth oxide, binder and conductive material according to preset amounts to obtain initial raw materials;

[0034] The weight of the zirconium oxide is 80-95 parts, the weight of the yttrium oxide is 3-7 parts, the weight of the rare earth oxide is 4-6 parts, the weight of the binder is 0-5 parts, and the weight of the conductive material is 20-40 parts.

[0035] Specifically, according to the proportion of zirconium oxide being 80-95 parts, the proportion of yttrium oxide being 3-7 parts, the proportion of rare earth oxide being 4-6 parts, the proportion of binder being 0-5 parts, and the proportion of conductive material being 20-40 parts, the raw materials are weighed to obtain initial raw materials.

[0036] S2 pre-treating the initial raw material to obtain a mixed raw material;

[0037] S21 drying the zirconium oxide, the yttrium oxide, the rare earth oxide and the conductive material;

[0038] Specifically, make sure all materials have been accurately weighed according to the preset amount and placed in a dry, clean container. Place zirconium oxide, yttrium oxide, rare earth oxides and conductive materials in the drying oven separately. Make sure the materials are evenly distributed on the tray or grid to increase the contact area with the hot air and improve the drying efficiency. After drying is completed, take out the materials and check their dryness. Use a hygrometer or observe the appearance and feel of the materials to judge. After confirming that they are dry, seal the materials and store them for later use.

[0039] S22: ball-milling and sieving the dried zirconium oxide, yttrium oxide, rare earth oxide and conductive material to obtain raw materials;

[0040] The temperature of the drying process is 80°C-120°C.

[0041] Specifically, the dried material is placed in a ball mill and an appropriate amount of ball milling media (such as ceramic balls, steel balls, etc.) is added. The ball mill is started, and the material is gradually refined under the impact and friction of the ball milling media to reach the desired particle size. After the ball milling is completed, the material is taken out of the ball mill and sieved. Use a sieve with an aperture of 50-100 mesh to classify the material into different particle size levels, and collect the sieved material for subsequent use.

[0042] S23: adding the binder into the raw material for granulation to obtain a mixed raw material.

[0043] Specifically, the binder is slowly added to the prepared raw materials. A stirrer or granulator is used to fully mix the binder so that the binder is evenly distributed on the surface of the raw material particles. During the mixing process, a suitable amount of solvent can be added to promote the dispersion and penetration of the binder. The mixed raw materials are made into particles of a certain size through the operation of the granulator. The uniformity and density of the particles are controlled to ensure the smooth progress of the subsequent pressing and sintering processes.

[0044] S3: placing the mixed raw material into a mold and pressing it to obtain a blade blank;

[0045] S31 selects the corresponding mold based on the knife shape drawing;

[0046] Specifically, according to the requirements in the drawing, search for the corresponding mold in the mold library.

[0047] S32: placing the mixed raw material into the mold and pressing it at a preset temperature;

[0048] The preset temperature is 1200°C-1800°C.

[0049] Specifically, before putting the mixed raw materials into the mold, the mold is fully inspected to ensure that the mold surface is free of damage and impurities, and all parts (such as mold core, mold frame, etc.) are correctly installed and positioned, and the granulated and dried mixed raw materials are evenly placed in the mold, and the pressing equipment is started at a preset temperature to press the mixed raw materials in the mold.

[0050] S33 cools the pressed mixed raw material and takes it out to obtain a blade blank.

[0051] Specifically, after the pressing is completed, the mold is taken out of the pressing equipment and placed on a cooling table for cooling. When the mold and the raw material are cooled to an appropriate temperature, the demoulding operation is performed, and the demoulded blade blank is taken out and preliminarily inspected. Check whether the shape, size and surface quality of the blade blank meet the requirements.

[0052] S4 sintering the blade blank to obtain a semi-finished product;

[0053] S41 preheats the sintering furnace;

[0054] Specifically, before preheating, first check whether the various functions of the sintering furnace are normal, start the preheating program of the sintering furnace, and let the sintering furnace gradually heat up to the set preheating temperature. When the sintering furnace reaches the preheating temperature, maintain the temperature for a period of time. After the preheating is completed, use the temperature measuring equipment to check whether the temperature of each area inside the sintering furnace is uniform, and record the relevant data for subsequent reference.

[0055] S42: placing the blade blank into a preheated sintering furnace and sintering at 1100° C.-1600° C. for 1.5 h-3 h, and keeping the temperature for 1.5 h-2.5 h to obtain a semi-finished product.

[0056] Specifically, after preheating is completed, the blade blank is placed in the sintering furnace, the sintering furnace door is closed, and the sintering program is started. When the sintering time reaches the predetermined value, it enters the insulation stage. The purpose of insulation is to allow the blade blank to fully react and diffuse at high temperature to achieve the best sintering effect. After insulation is completed, the sintering furnace is allowed to cool naturally to room temperature. After cooling is completed, the sintering furnace door is opened to take out the sintered semi-finished product.

[0057] S5 processes the semi-finished product to obtain a conductive ceramic tool.

[0058] Specifically, lathes, milling machines and other machine tools are used to perform rough processing on the sintered semi-finished products to remove excess parts and preliminarily form the outline and shape of the tool; grinding, polishing and other processes are used to fine-process the rough-processed tools to improve the surface finish and dimensional accuracy of the tools; the finished tools are quality inspected, including dimensional measurement, hardness testing, and electrical conductivity testing; qualified conductive ceramic tools are cleaned to remove oil and impurities generated during the processing, and are dried and rust-proofed; finally, they are packaged.

[0059] Embodiment 1:

[0060] 85 parts of zirconium oxide, 5 parts of yttrium oxide, 5 parts of rare earth oxide, 3 parts of binder and 25 parts of conductive material were weighed according to preset amounts as initial raw materials.

[0061] The initial raw material is dried (100° C.), then ball-milled and sieved, and a binder is added to granulate to obtain a mixed raw material.

[0062] Select a corresponding mold, press the mixed raw material into shape at a preset temperature of 1500°C, and take it out after cooling to obtain a blade blank.

[0063] After preheating the sintering furnace, the blade blank was sintered at 1300°C for 2 hours and kept warm for 2 hours to obtain a semi-finished product.

[0064] The semi-finished products are finely processed to make conductive ceramic cutting tools.

[0065] Advantages: This embodiment ensures the uniformity and density of the knife blank by precisely controlling the raw material ratio and the pressing temperature, thereby improving the mechanical strength and conductive performance of the knife.

[0066] Embodiment 2:

[0067] Accurately weigh 90 parts of zirconium oxide, 4 parts of yttrium oxide, 4 parts of rare earth oxide, binderless additive (2 parts) and 30 parts of conductive material.

[0068] The raw materials were dried at 120°C and directly mixed evenly after ball milling without granulation.

[0069] The mixed raw materials are pressed at a high temperature of 1600°C using a specific mold and quickly cooled to obtain a blade blank.

[0070] After the sintering furnace is preheated, the semi-finished product is sintered at 1400°C for 2.5 hours and kept warm for 2 hours.

[0071] After fine grinding and polishing, the conductive ceramic tool is completed.

[0072] Advantages: This embodiment significantly improves the hardness and wear resistance of the tool through high-temperature rapid pressing and high-temperature sintering, and is suitable for the field of high-precision processing.

[0073] Embodiment three:

[0074] 80 parts of zirconium oxide, 7 parts of yttrium oxide, 6 parts of rare earth oxide, 2 parts of binder and 35 parts of conductive material are mixed as raw materials.

[0075] The raw materials were dried at 80°C to ensure that no moisture remained, then ball-milled and sieved, and a binder was added to granulate.

[0076] Select the mold according to the knife shape drawing, press the mixed raw materials at a low temperature of 1200℃, and slowly cool them to obtain the knife blank.

[0077] After the sintering furnace is fully preheated, sintering is performed at 1100°C for 3 hours and kept warm for 1.5 hours to obtain a dense and uniform semi-finished product.

[0078] After multiple steps of fine processing, ceramic tools with high conductivity and excellent cutting performance are made.

[0079] Advantages: By optimizing the sintering temperature and time and adding appropriate binders, the tool produced in this embodiment not only has excellent conductivity, but also has good toughness and impact resistance, and is suitable for a variety of complex processing scenarios.

[0080] Beneficial effects:

[0081] 1. Raw material selection and ratio optimization: By accurately weighing and mixing zirconium oxide, yttrium oxide, rare earth oxide, binder and conductive material, initial raw materials with specific properties are formed. The overall properties of the material, such as hardness, toughness, wear resistance and conductivity, can be improved, thereby extending the service life of the tool.

[0082] 2. Pretreatment enhancement: Drying, grinding, refining and screening the initial raw materials for pretreatment steps significantly improve the purity, uniformity and fineness of the raw materials. This not only helps to reduce defects (such as bubbles and cracks) during sintering, but also promotes the densification of the material, further enhancing the performance and stability of the tool.

[0083] 3. Precision pressing and forming: The mold pressing and forming technology is used to ensure the shape and size accuracy of the blade blank. The pressure is controlled to rise evenly during the pressing process to avoid the raw material being squeezed out of the mold or cracks, thereby improving the integrity and strength of the blade blank.

[0084] 4. High temperature sintering densification: Through the precise sintering process, the blade blank undergoes a densification reaction at high temperature, which improves the density and hardness of the material. At the same time, the heat preservation treatment during the sintering process helps to eliminate internal stress and reduce the occurrence of cracks and defects.

[0085] 5. Fine processing and protection: Fine processing technologies such as grinding and polishing are used in the processing process to improve the surface finish and dimensional accuracy of the tool. For conductive ceramic tools, special attention is paid to protecting their conductive layer from damage, ensuring that the tool has excellent mechanical properties and good conductive properties.

[0086] The above disclosure is only a preferred embodiment of a method for forming a conductive ceramic tool of the present invention. Of course, it cannot be used to limit the scope of rights of the present invention. Ordinary technicians in this field can understand that all or part of the processes of the above embodiments and equivalent changes made according to the claims of the present invention are still within the scope of the invention.

Claims

1. A method for forming a conductive ceramic tool, characterized in that: The following steps are involved: Weighing zirconium oxide, yttrium oxide, rare earth oxide, binder and conductive material according to preset amounts to obtain initial raw materials; Pre-treating the initial raw material to obtain a mixed raw material; Putting the mixed raw material into a mold and pressing it to obtain a knife blank; Sintering the blade blank to obtain a semi-finished product; The semi-finished product is processed to obtain a conductive ceramic tool.

2. The method for forming a conductive ceramic tool according to claim 1, characterized in that: In "weighing zirconium oxide, yttrium oxide, rare earth oxide, binder and conductive material according to preset amounts", the amount of zirconium oxide is 80-95 parts, the amount of yttrium oxide is 3-7 parts, the amount of rare earth oxide is 4-6 parts, the amount of binder is 0-5 parts, and the amount of conductive material is 20-40 parts.

3. The method for forming a conductive ceramic tool according to claim 2, characterized in that: In “pre-treating the initial raw material to obtain a mixed raw material”, it includes: Drying the zirconium oxide, the yttrium oxide, the rare earth oxide and the conductive material; Ball-milling and screening the dried zirconium oxide, yttrium oxide, rare earth oxide and conductive material to obtain raw materials; The binder is added into the raw material for granulation to obtain a mixed raw material.

4. The method for forming a conductive ceramic tool according to claim 3, characterized in that: In "drying the zirconium oxide, the yttrium oxide, the rare earth oxide and the conductive material", the drying temperature is 80°C-120°C.

5. The method for forming a conductive ceramic tool according to claim 3, wherein: The step of “putting the mixed raw material into a mold and pressing to obtain a blade blank” includes: Select the corresponding mold based on the knife drawing; Putting the mixed raw material into the mold and pressing it at a preset temperature; The pressed mixed raw material is cooled and then taken out to obtain a blade blank.

6. The method for forming a conductive ceramic tool according to claim 5, characterized in that: In "placing the mixed raw material into the mold and pressing at a preset temperature", the preset temperature is 1200°C-1800°C.

7. The method for forming a conductive ceramic tool according to claim 5, characterized in that: In “sintering the blade blank to obtain a semi-finished product”, it includes: Preheating the sintering furnace; The blade blank is placed in a preheated sintering furnace and sintered at 1100° C.-1600° C. for 1.5 h-3 h, and kept warm for 1.5 h-2.5 h to obtain a semi-finished product.

Images