Ettevõtte nimi:BEIJING DEMINA PRECISION MACHINERY CO., LTD Tel 0086-10-62965622 0086-13910819265 Meil:[email protected] Aadress: No.1034, Building A, Hongfu Science Park, Beiqijia Town, Changping District, 102209, Beijing, China
Introduction to four - axis CNC tool grinder
Four-axis CNC tool grinder is a powerful functional CNC grinding machine. It has a variety of grinding process means. It is equipped with a computer which can be used to input and save the tool parameters of the tool to be ground. In the process of grinding, the program can automatically choose and replace. And the corresponding data can obtain when grinding the same tool. The so-called four-axis CNC grinding machine is generally to add a rotation axis on the basis of the grinding wheel swing axis. Wheel inclination Angle axis, and workpiece feed axis usually called the fourth axis. The so-called CNC machine.
In fact, is to reduce the grinding tool change, clamping and other work which originally need to be manually operated. Therefore, the can produce and grind a variety of CBN and PCD tools. At the same time, greatly improve the production and grinding efficiency. Which is very suitable for customers with a large number of tool processing.
A drill grinder is used to repair and grind a 3-75mm large bit machine, at the same time can also repair and grind end milling cutter, tap, chamfer cutter, grinding workpiece outer circle, etc., high precision, very convenient operation. When grinding tools of different materials, regrinding can be started as long as the rotary motor, which can increase safety and reduce the time of grinding wheel dismantling and dressing. Using precision 6-claw chuck, one clamping can complete grinding, simple setting, accurate and fast grinding.In the machining drilling operation, the drill bit is the tool with the highest utilization rate. The top edge of the drill bit will wear out in the process of drilling. Therefore, after using for a certain period of time, it needs to be sharpened again. The standard for grinding head edge is to make the head edge of the bit symmetrical with the center axis of the bit. If the center axis of the drill bit is not symmetrical after trimming and grinding of the head edge of the drill bit, it will be difficult for the drill bit to swing and sway the workpiece during drilling, which will reduce the safety of operation. More importantly, the hole drilled in this way has poor position accuracy, the actual aperture does not meet the required size, and the shape of the hole is not cylindrical, which will affect the follow-up work. The traditional method of repairing the top edge of drilling is that the drill operator holds the drill bit by feeling and determines whether the top edge is symmetrical. The efficiency is very low and the grinding precision is not high. Therefore, there is an urgent need for a bit grinding machine to overcome the above-mentioned defects.
Type of honing machine
There are two types of honing machines: horizontal and vertical. The selection principle can refer to the following aspects:
1. Choose different types of honing machines in different batches, such as multiple varieties and small batches, choose the machine with low power and large versatility. If the batch is large, the use of high-power special machine tools.
2. Select the main specifications and parameters of the machine according to the workpiece aperture, hole length, and external dimensions.
3. Select the performance of the reciprocating mechanism of the machine tool according to the structure of the hole. If the blind hole, the reciprocating stroke mechanism is required to have high reversing and repeating accuracy and small overrun. So it should able to adapt to manual or automatic alternating control of long and short strokes. Such as short hole, hole accuracy requirements and high, choose mechanical reciprocating travel mechanism.
4. According to the requirements of hole machining allowance, shape error and hole accuracy, the telescopic feed method of the telescopic mechanism was selected.
5. According to the number of honing times for the same hole, production batch or production time, workpiece shape size and the number of holes processed on the workpiece, select the number of the spindle of the machine or the number of machines tools and the form of the worktable. Such as a large number of small parts, can choose vertical with rotating table multi-spindle machine. For large or linear porous workpieces, move worktable or move honing head machine can be used. Small batch optional single shaft. Multiple axes are optional for large quantities, honing a hole multiple times or several holes at the same time.
6. Choose the size control method according to the size accuracy of the hole, the size of the aperture, the structure form, the abrasion resistance degree of the oil stone, the structure form of the honing head, the production batch.
7. According to the requirements of hole surface roughness, dimensional accuracy and production time, select the cleaning method of cutting fluid and whether it is necessary to cool the cutting fluid device.
Selection principle of honing machine
Stable performance: For mechanical equipment such as honing machines, especially those with high application accuracy, stable performance is required to ensure smooth operation. Thereby achieving better functional performance and higher processing quality levels.
Convenient operation: In order to optimize the operation and simplify the use, it is recommended to use a honing machine that is easy to operate. Because the equipment is easy to grasp, simple to operate, and easy to optimize.
Efficiency: The honing machine must have high efficiency in order to achieve processing and fully meet the functional requirements of use. The economic benefits in the application will be relatively high so that such equipment can better meet the needs of users.
Convenient maintenance: In view of possible failures in the use of mechanical equipment products, considering maintenance, it is usually very convenient and has a good maintenance effect on the honing machine.
First of all, the cutting edge of the bit must be symmetrical from the Angle, or the hole drilled will be larger than the diameter of the bit. In addition, the geometric parameters and Angle of the bit grinding. In fact, these can be ignored, because no one can accurately grasp the data, but the Angle of the bit grinding must be properly mastered. Apex Angle is the most important of the chisel edge grinding because the two main blades of the bit can as vertex Angle in change, we can see from the photos of the two main blade Angle is 118 ° with the change of the vertex Angle, the Angle of the two main blades or greater than 118 ° or less than 118 °, thus we can make a conclusion, grinding bit first hand to steady, cannot appear jitter on the grinding wheel, the second to grasp good grinding Angle so that we can make mechanical workers grinding out the high precision drill.1. The diameter of the twist drill is limited by the aperture. The spiral groove makes the drill core finer and the bit stiffness low. There are only two edges and the axis of the hole is inclined to skew. The transverse edge makes centering difficult, axial resistance increases, and the bit is easy to swing. Therefore, the shape and position error of the drilling hole is large.2. The front and rear cutting surfaces of twist drill are curved surfaces. The front and rear angles of each point along the main cutting edge are different. The front Angle of the horizontal edge reaches -55°. Poor cutting conditions. Cutting speed along the cutting edge distribution is not reasonable, the lowest strength of the cutting edge cutting speed is the largest, so serious wear. As a result, the machining hole accuracy is low.3. All the main cutting edges of the drill bit are involved in cutting, and the cutting speed of each point on the edge is not equal, which is easy to form a spiral chip, making it difficult to remove chips. Therefore, the chip and hole wall extrusion friction, often scratch the hole wall, the surface roughness after processing is very low.
Classification of tool materials
1. Classification: common cutting tool materials in the industry include high-speed steel, carbide, polycrystalline cubic boron nitride (PCBN), polycrystalline diamond (PCD)and so on.
2.Advantages and disadvantages
1) High-speed steel tool: its advantage is the bending strength is higher and more used in the occasion of greater impact. On the other hand, the price of this tool is generally lower. Its disadvantage is low hardness, so wear resistance and red hardness is poor. It is not suitable for high-speed cutting. Therefore, this tool is generally used for rough machining. There are many kinds of high-speed steels with different chemical composition and different properties.
2)Carbide tool: its hardness can reach about HRA90, wear resistance and red hardness are better, but its impact resistance is poor.
3) PCBN tool: good impact resistance, especially in the rough machining field. But the material is not suitable for processing steel below 45HRC because it is easy to produce adhesive wear and crack.
4) PCD tool: this tool has high wear resistance and low friction to do sharp edge grinding with a good machining surface reaching 0.2 smoothness. At the same time, the hardness can reach more than 10000HV to cut carbide, industrial ceramics, and other high hardness products. The disadvantage is that the price is too high.
Selleks, et puuriotsikut hästi teritada, on väga oluline järgmise "lihvimise" jaoks kindel alus luua, asetades serva enne lihvimist korralikult paika. Siin on neli valemit, mis juhendavad lõike serva lihvimisprotsessi ning tulemus on parem.Puuri teritamise meetodid"Serv ääristab ratta nägu."See on puurajaläbitööriista ja lihvketta suhteline asetuse esimene samm. Mõned õpilased toetuvad lihvkettale ja hakkavad juba enne lõikeääre sellele asetamist lihvima. See ei kuluta hästi. "Lõikeäär" on siin peamine lõikeäär ja "tasandamine" viitab teritatava osa peamise lõikeääre horisontaalsele asendile. "Ketipind" tähendab lihvketta pinda. "Toeta" tähendab aeglaselt läheneda. Sel hetkel ei tohi puur lihvkettale puutuda."puurvarre nurga vabastus esinurka puurides."See on viidepuurdimisvõlli ja lihvimisketta pinnase asendi vahelisele suhtele. "Nurga (nõlva) nurgapool" on pool 118°±20-st, mis on umbes 60° ja väga oluline. See mõjutab otsa nurka, peamise lõikeläätse kuju ja põiki serva tasandit. Õpilastele tuleks meelde tuletada, et 30°, 60° ja 90° kolmnurkades on tavaliselt kasutatavad nurgad 60°, mis on õpilastele kergesti meisterdatav. Valem 1 ja valem 2 näitavad puuriga aset leidnud positsiooni enne lihvimist. Mõlemad tuleks võtta tervikuna. Ärge ignoreerige tasakaalustatud tera eesmärgil kaldenurka ega tera tasakaalu kaldtelje eest. Need vead on praktikas tavalised. Nüüd on pärast õiget positsiooni puur valmis lihvimisketta vastu puutuma."Terast kuni lihvimisjärgse seljani."See seoses aeglilõike järkjärgulisest lihvimisest kogu tagumise pinna ulatuses. See hõlbustab kuumuse hajumist ja tera lihvimist. Stabiliseerimis- ja konsolideerimisvalemi üks ja kaks alusel võib puuritera õrnalt puudutada lihvimisketast väikese lõikeserva lihvimiseks. Lõikeserva lihvimise ajal tuleb jälgida sädeluse ühtsust, reguleerida õigeaegselt survet ning jälgida puuritera jahutamist. Kui tera pärast jahtumist uuesti lihvitakse, tuleb jätkata valemi üks ja kaks positsioneerimist, mis alguses pole sageli kerge haarata ning mille õigsust muudetakse sageli tahtmatult."Üles-alla kiikuv saba ei lähe kõveraks."See tegevus on väga oluline ka puuripinna lihvimise protsessis. Õpilased muudavad sageli puuripinna lihvimisel "üles-alla liikumise" "üles-alla pöörlemiseks", mistõttu hävitatakse puuriosa teine peamine tera. Samal ajal ei tohiks puuritera saba olla liiga kõrgel horisontaalse keskjoone kohal, vastasel juhul nüristab see serva ja muudab lõikamise võimatuks.
Due to the residue of WBN, HBN, pyrophyllite, graphite, magnesium, iron and other impurities in CBN micro powder. In addition, it and the binder powder contain adsorbed oxygen and water vapor, which is not good for sintering. Therefore, the purification of raw materials is one of the important steps to ensure the performance of polycrystalline synthesis. During the development, we used the following methods to purify CBN micro powder and binder materials: first, NaOH was used to treat CBN emblem powder at about 300 C to remove pyrophyllite and HBN. Then cook perchloric acid to remove the graphite.
Finally, the metal was removed by boiling with HCl on an electric heating plate and washing with distilled water until neutral.Co, Ni, and Al used as binders were treated by hydrogen reduction. Then, the CBN and the binder were mixed evenly according to a certain ratio and mixed into the graphite mold. The mixture was sent into a vacuum furnace with a pressure less than 1E2 and heated at 800 ~ 1000°C for 1h to remove the dirt, adsorbed oxygen and water vapor on the surface so that the surface of CBN grains was very clean.
Treatment of PCBN raw materials
In terms of the choice of binder materials and the amount of binder added, the total amount of binder added should be sufficient but not excessive. The experimental results show that the wear resistance and bending strength of polycrystalline are closely related to the average free path (the thickness of the bonding phase layer). When the average free path is 0.8 ~ 1.2 m, the ratio of polycrystalline wear is the highest, and the amount of binder is 10% ~ 15% (mass ratio).
In addition to the choice of binders, the determination of CBN particle size and particle size ratio is also very important. The processing accuracy and surface quality requirements of root holder, the CBN particle size used in manufacturing cutting tools can be roughly divided into a coarse particle size of 20 ~ 30 nm. Medium particle size 3 ~ 10 microns. Fine particle size 2 microns. It is difficult to make high precision polycrystalline tools made of coarse grain, but its wear resistance, impact resistance is higher, fine-grain polycrystalline made of tools can meet the requirements of finishing and superfinishing.
Demina Super Hard tool Grinder for PCD tools can be economical to manufacture and grind the PCD tools, PCBN tools, CVD tools, tungsten carbide, and non-standard high-speed steel blade. During the grinding of standard or non-standard welding tool, machine folder blade, boring tool, grooving cutter, and other types of cutting tools, it is easy to grind out the angle and arc transition edge in these cutting tools.Feature Of The Tool Grinder1.Bilateral position for ergonomics;2.Radial clamping for spindle rigidity;3.Spindle with cooling brings a long life span;4.Servo Variable oscillation automatically;5.Servo control, auto & manual feeding;6.CCD monitoring & measuring, automatic centering;7.Graph process and video Demo on PC;8.Central lubrication, coolant with filter;Main Machine And Standard Configuration1.Spindle Motor Power: 4.5Kw, Variable speed (500-4000 rpm)2.Spindle Declination can be arbitrarily adjusted -5°-25°3.Max oscillation length is 30mm, the max oscillation frequency is 60times/min4.Tool shaft is equipped with an air brake.5.Optical CCD system with 100x zoom and a 15-inch monitor6.One Diamond Grinding Wheel.Welcome your any reply, please feel free to contact me.
Performance of CBN tool cutting
Because CBN crystal and diamond crystal belong to sphalerite type, and the lattice constant is close to each other, and the chemical bond type is the same, CBN has the hardness and compressive strength close to that of diamond, and because it is composed of N and B atoms, it has higher thermal stability and chemical inertia than diamond. The main properties of PCBN tool materials are as follows:
1.PCBN tool has high hardness and wears resistance
PCBN tool has high hardness and wears resistance. Therefore, it has a higher wear resistance than hard alloy and ceramics when used for processing high-hardness materials, which can reduce the size deviation or size dispersion in the processing of large parts. It is especially suitable for equipment with a high degree of automation, which can reduce the time of tool changing and tool adjusting, so as to give full play to its efficiency.
2. PCBN tool has high thermal stability and high-temperature hardness
PCBN tool has high thermal stability and high-temperature hardness, the heat resistance of CBN can reach 1400 ~ 1500℃. Therefore, when the cutting temperature is higher, the processed material will be softened, and the hardness difference between the tool increases, which is conducive to the cutting process, but has little impact on the tool life.
3. PCBN tool has high chemical stability
CBN has a very high antioxidant capacity, at 1000℃ does not produce oxidation phenomenon, and iron materials at 1200 ~ 1300℃ does not produce chemical reaction, but at 1000℃ or so will produce hydrolysis with water, resulting in a large number of CBN wear, so when using PCBN tool wet cutting need to pay attention to the choice of cutting fluid type. In general, wet cutting does not significantly improve the life of PCBN tools, so the use of PCBN tools are often dry cutting.
4. PCBN tool has a good thermal conductivity
The thermal conductivity of CBN material is lower than that of the diamond but much higher than that of cemented carbide, and with the increase of cutting temperature, the thermal conductivity of PCBN tool increases constantly, so that the tip of the heat quickly out, conducive to the improvement of workpiece processing accuracy.
5. PCBN tool has a lower friction coefficient
The friction coefficient between CBN and different materials is also different, but it is basically between 0.1 and 0.3, which is much lower than that of cemented carbide, and it decreases slightly with the increase of friction speed and positive pressure. Therefore, the low coefficient of friction and excellent anti-adhesion ability make it difficult to form retention layers or chippings when cutting CBN tools, which is conducive to improving the quality of the machined surface.
Demina CBN cutting tool grinding machine is specialized in grinding CBN tools. There are necessary rules for improving machining efficiency and prolonging tool life by CBN cutting tool1.Adequate cooling is very effective for controlling tip temperature. For CNC machine tools and cutting tools with internal cooling, the internal cooling function that is most conducive to cooling should be used as far as possible. So that the strong high-pressure water can take away a lot of cutting heat and ensure that the processing area is kept within a certain temperature range. Even for machining equipment without internal cooling function, it is recommended to use external internal cooling tool handle, while enhancing the cooling pressure and improving the cooling effect.2.Proper control of cutting force and cutting speed is also one of the most effective ways to reduce the temperature of the machining area and prolong the tool life. In general, the machining of difficult-to – machined materials usually adopts the fine – ground cutting edge, smaller cutting depth, and cutting width. It is very important to select a reasonable cutting line speed according to different machining materials, parts structure, and machining equipment.3.For the same machine tools and parts, the machining method will greatly affect the machining efficiency and tool life. The purpose of cycloidal machining, spiral interpolation, and large feed milling is to reduce the cutting force and the cutting zone temperature. Spiral interpolation makes the cutting amount of each tooth relatively uniform, especially at the corner is the most obvious. Large feed cutting method, with small cutting depth, large feed effectively reduces the cutting force, so that the machining process produces the minimum cutting heat, the machining area temperature is the lowest.4.It is also an effective way to control the temperature rise to ensure the processing interrupt chip. In general, a large amount of cutting heat is generated on the chip in metal processing, and a large amount of cutting heat generated in the processing will be taken away by the chip effectively. In general, we do not want to have long chips in the process. More attention should be paid to the processing of difficult materials, especially for the rough machining process. Under the condition that the rigidity of the whole processing system allows, should try to make it in the whole processing process to produce chip, try to use the reverse milling way, so that the formed iron chip from thick to thin, and the shape of the iron chip is “9”, “6” or “C” shape.5. Proper and reasonable cutting tool effective Angle is maintained in the process so that each effective cutting tooth of the cutting tool can ensure the longest cooling time to the maximum extent, which is very beneficial to improve the cutting efficiency of materials and prolong the working life of the cutting tool.The effective tool Angle, reflected in the cutting parameters, is directly related to the cutting depth Ap and cutting width Ae, as well as the tool diameter Dc. Especially in the processing of difficult materials, should try to avoid full cutting. In the actual machining, the tool life will be reduced by about 30% for every doubling of the cutting Angle of the tool.In a word, the parts of difficult to process materials have high hardness, high strength, high toughness, and high wear resistance, and their machining performance is poor, the processing is difficult, the processing efficiency is low. In this way, the parts of difficult to process materials have put forward higher requirements for machining tools.Cubic boron nitride is widely used in cutting ferrous metal materials such as high hardness iron and steel due to its excellent cutting performance. The development of cubic boron nitride cutter has greatly improved the processing efficiency, improved product quality, and reduced production cost, and now it has occupied a large share in the market.