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Characteristics of large deep hole drill

1. The whole casting adopts high-quality mihanna cast iron, and after aging treatment, the structure of the casting is uniform and stable, with high rigidity and good stability.

2. The three-axis adopts imported high rigidity and high precision screw rod, which provides more powerful torque and durability during processing.

3. The imported high rigidity, heavy load, high speed and high precision ball linear guide rail is adopted for the three-axis, which ensures the high precision of processing and prolongs the service life of the linear guide rail.

4. The three-axis feed drive adopts Japanese AC servo motor and driver, and is directly connected with the ball screw. The transmission is stable without backlash. At the same time, its good rigidity and optimized shock absorption performance greatly improve the dynamic rigidity of the transmission system, which can realize rapid movement.

5. The spindle adopts imported powerful motor, which can meet the processing requirements of high and low speed, and is equipped with automatic oil cooling system to ensure constant temperature during processing.

6. The operating system adopts Taiwan system, which can be compatible with CAD / CAM software to use more metadata.

Fault analysis of processing large horizontal computer gongs

As a processing industry, especially machining, it is the basic knowledge that every enterprise must know how to analyze and solve its faults. It is also the first step of the processing and maintenance of large horizontal computer gongs. By analyzing the faults, we can quickly find out the causes of the faults and solve them. At the same time, it is also a function of preventing and expanding the machinery. Generally speaking, large horizontal computer The fault analysis of Gong processing has the following aspects:

1. Action analysis method action analysis method is a method to determine the bad part of the action and trace the root cause of the fault by observing and monitoring the actual action of the machine tool. Generally speaking, the hydraulic and pneumatic control parts of Dongguan computer gonging machine tool, such as automatic tool change device, exchange table device, fixture and transmission device, can be determined by action diagnosis.

2. State analysis state analysis method is a method to determine the cause of failure by monitoring the working state of the actuator. This method is most widely used in the maintenance process of Dongguan computer gongs.

3. Conventional analysis conventional analysis is a method to check the mechanical, electrical, hydraulic and other parts of Dongguan computer gong processing machine tool, so as to determine the cause of the failure. The above is a large horizontal computer gongs processing failure analysis methods and solutions, hope to help the majority of users

Classification and application of aluminum plate

According to different processing technology, it can be divided into cold rolling and hot rolling.

According to the different thickness, it can be divided into thin plate and medium thick plate. The aluminum foil with thickness less than 0.2mm specified in GB / t3880-2006 is called aluminum foil. Commonly used brand: pure aluminum plate, strip. Foil. Thick plate, stretch tube. Squeeze the tube. Type. Great. Cold processed bar is mainly used in the situation of high corrosion resistance and formability, but not high strength parts, such as chemical equipment, ship equipment, railway tank car, conductive material, instrument material, welding rod, etc.

3003: plate and strip. Foil. Plate. Stretch the tube. Squeeze the tube. Type. Great. wire rod. Cold working bar, cold working wire, rivet wire, forging, radiator material. It is mainly used for processing parts requiring good molding performance, high corrosion resistance, or weldability, or parts requiring these properties and higher strength than 1 *, such as tanks and tanks for liquid transportation, pressure tanks, storage devices, heat exchangers, chemical equipment, aircraft oil tanks, oil ducts, reflectors, kitchen equipment, washing machine cylinder, rivets, welding Silk. Aluminum clad 3003 alloy: plate, thick plate, stretch tube. Extrusion pipe house partition, top cover, pipeline, etc. 3004: plate, thick plate, tensile pipe. As long as the extruded tube is used for the whole aluminum can body, it requires higher parts than 3003 alloy, chemical product production and storage device, sheet metal processing parts, building baffles, cable ducts, sewers, various lighting parts.

3004 aluminum clad alloy: plate and thick plate are mainly used for building partition, baffle, sewer, roof cover of industrial building 5052: plate, thick plate, foil, tensile pipe, cold processed bar, cold processed wire, rivet wire. This alloy has good forming and processing performance, corrosion resistance, weldability, fatigue strength and medium static strength, and is used for making aircraft oil tank and oil pipe , as well as traffic vehicles, ship’s sheet metal parts, instruments, street lamp brackets and rivet wires, etc. 6061: plate, thick material, tensile pipe. Extrusion pipe, bar, profile, wire, conduit, rolled or extruded structural profile, cold processed bar, cold processed wire, rivet wire, forging. All kinds of industrial structural parts with certain strength, corrosion resistance and high weldability are required, such as pipes, bars and profiles for manufacturing trucks, tower buildings, ships, trams, railway vehicles, furniture, etc.

According to the classification of aluminum plate brand, according to the different metal elements contained in the aluminum plate, we will introduce it gradually.

1. The 2000 series aluminum plate represents 2A16 (Ly16) 2A12 (LY12) 2A06 (LY6) 2000 series aluminum plate, which is characterized by high hardness, of which the copper element content is the highest, about 3-5%. 2000 series aluminum plate belongs to aviation aluminum material, which is not often used in conventional industry at present. At present, there are few manufacturers of 2000 series aluminum plates in China. The quality cannot be compared with that of foreign countries. At present, the imported aluminum plates are mainly provided by Korean and German manufacturers. With the development of China’s aerospace industry, the production technology of 2000 series aluminum plate will be further improved.

In such humid environment, the price is higher than 1000 series, which is a more commonly used alloy series.

2. 5000 series represents 5052.5005.5083.5a05 series. 5000 series aluminum plate belongs to the commonly used alloy aluminum plate series, the main element is magnesium, and the magnesium content is between 3-5%. Also known as aluminum magnesium alloy. It is characterized by low density, high tensile strength and high elongation. In the same area, the weight of aluminum magnesium alloy is lower than other series, so it is often used in aviation, such as aircraft fuel tank. It is also widely used in conventional industry. The processing technology is continuous casting and rolling, belonging to the hot rolling aluminum plate series, so it can do deep oxidation processing. In China, 5000 series aluminum plate belongs to one of the more mature aluminum plate series.

3. 6000 series represents 6061, which mainly contains two elements of magnesium and silicon. Therefore, 6061 is a cold-treated aluminum forging product with the advantages of 4000 series and 5000 series. It is suitable for applications with high requirements of corrosion resistance and oxidation resistance. The utility model has the advantages of good usability, excellent interface characteristics, easy coating and good processability. It can be used on low-pressure weapons and aircraft joints. General features of 6061: excellent interface features, easy coating, high strength, good usability, strong corrosion resistance. Typical uses of 6061 aluminum: aircraft parts, camera parts, couplers, ship accessories and hardware, electronic accessories and joints, decorative or various hardware, hinge head, magnetic head, brake piston, hydraulic piston, electrical accessories, valves and valve parts.

4. The 7000 series represents the 7075 mainly containing zinc. It also belongs to the aviation series. It is an aluminum magnesium zinc copper alloy. It is a heat-treatment alloy. It belongs to super hard aluminum alloy. It has good wear resistance. 7075 aluminum plate is stress relieved and will not deform or warp after processing. All super thick 7075 aluminum plates are detected by ultrasonic, which can ensure no sand holes and impurities. 7075 aluminum plate has high thermal conductivity, can shorten forming time and improve working efficiency.

The main feature is that the hardness of 7075 is a high hardness and high strength aluminum alloy, which is commonly used to manufacture aircraft structures and futures. It requires the manufacture of high stress structural parts and dies with high strength and corrosion resistance. At present, China’s production process still needs to be improved. (a foreign company in our company once proposed that the annealing of 7075 aluminum plate made in China is uneven, and the surface and internal hardness of aluminum plate are inconsistent.).

How to process parts in large CNC machining center

CNC machining is flexible and highly automatic, especially suitable for machining curve and curved surface parts with complex contour and shape, as well as complex box and prism parts with a large number of holes and grooves. In the case of multiple varieties and small batch production, the use of CNC machining can obtain higher economic benefits.

The processing technology of large-scale CNC is basically the same as that of common processing, but it has its own characteristics. Therefore, when designing the NC machining process of parts, we should not only follow the principle of good flexibility and high automation of NC machining, especially suitable for machining the curve and curved surface parts with complex contour and shape, as well as the complex box and prism parts with a large number of holes and grooves. In the case of multiple varieties and small batch production, the use of NC machining can obtain higher economic benefits.

The determination of tool setting point and tool change point in large CNC machining center is the starting point of tool movement relative to workpiece. Since the program is also executed from this point, the tool setting point is also called the program starting point or starting point. When programming, the selection of tool setting point should be considered first. When the machining accuracy requirements are not high, some surfaces on the workpiece or fixture can be directly used as the tool alignment surface; when the machining accuracy requirements are high, the tool alignment point should be selected on the design basis or process basis of the part as much as possible, for example, for the parts with hole positioning, the axis of the hole taken as the tool alignment point is more appropriate. The tool setting point must have a certain coordinate relationship with the positioning datum of the workpiece, so as to determine the relationship between the coordinate system of the machine tool and the workpiece. The selection of tool setting point shall facilitate the calculation of coordinate value and the tool setting. During the tool setting, the tool setting point shall coincide with the tool position. The so-called tool point refers to the intersection point of the tool axis and the tool bottom surface for the flat end milling cutter; the ball end milling cutter refers to the ball center of the ball head part; the turning tool refers to the tool tip; the drill bit refers to the drill tip; the line electrode cutting machine tool refers to the focus of the line electrode axis and the part surface. When the tool change is needed in the process of machining, the tool change point shall be specified, and the position of the tool change point shall be set according to the principle that the workpiece, fixture and machine tool shall not be damaged during the tool change.

How is CNC precision machining programmed

（1） It can be expressed by diameter value programming or radius value programming and radius value programming.

The default programming mode of the CNC system is diameter value programming, which is because the radial dimensions of the processed parts are expressed by diameter value when they are measured on the drawing, so it is most convenient to use diameter value programming, that is, in the diameter direction, when absolute value programming is used, X is indicated by diameter value; When programming with increment value, it is expressed as twice of the actual radial displacement and attached with direction sign (positive direction can be omitted).

（2） Absolute value programming, incremental value programming or mixed programming are used to mark the dimensions according to the drawings of the processed parts. From the point of view of programming convenience, in a program section, absolute value programming, incremental value programming or mixed programming are used. When programming in absolute coordinates, the coordinate words X and Z are used; when programming in incremental coordinates, the coordinate words u and W are used.

（3） Most CNC lathes have the function of tool automatic compensation, which can realize the compensation of tool tip radius, tool wear and the position error when installing the tool. Before CNC precision machining, the operator only needs to input the relevant compensation value into the specified memory, and the CNC system can automatically compensate the cutter. There is no need to change the machining program no matter the radius of the tool tip arc, the tool wear or the change of the tool position, so the programmer can program according to the actual contour size of the workpiece.

Definition and function of automatic plate processing

As the name implies, automatic sheet metal processing is the process of deformation or fracture of iron, aluminum, copper and other metal plates used for metal punch and die, and has a certain shape and size. At present, precision punch is usually used in the hardware processing of metal plate in the manufacturing industry. This processing method not only has high efficiency and low processing cost, but also has stable and uniform quality precision stamping products. However, the use of precision stamping processing method also has certain limitations, general. It is used for metal sheet cutting, the whole forming punch and the processing of precision parts. The process is complex. You need to cooperate with other processing or stamping automation equipment to complete.

At present, the stamping industry is a very extensive industry, which goes deep into all aspects of the manufacturing industry. In foreign countries, stamping is called sheet forming. In our country, there are also such names. But there is a slight difference. The so-called plate forming refers to the use of plates, thin-walled tubes, thin profiles, etc. as raw materials. The forming method of plastic processing is generally called sheet forming. At this time, the deformation in the direction of thick plate is generally not considered. The great development of stamping is attributed to the development of automobiles, airplanes and household appliances. The stamping automation production has been stably formed in many production enterprises, which will completely replace the traditional processing technology. Precision punch is generally suitable for blanking, punching, bending and forming of medium-sized, continuous die or single engineering sheet steel parts of multi-material products. It can be used for single punching, continuous die, manipulator connection or adding transmission system. It can be widely used in a variety of mass production of metal sheet metal processing, punching, forming and drawing. Such as traffic vehicles, clocks, home appliances, stationery, hand tools, hardware, computers and other products processing. At the same time, it can also be equipped with an automatic feeder, which is engaged in automatic transfer of the whole production line processing.

Introduction to slow wire processing

1. Anti electrolysis (BS) pulse power supply for slow wire processing

Water quality working fluid is used in low speed WEDM. Water has a certain conductivity, even after deionization treatment, reducing the conductivity, but there is a certain amount of ions. When the workpiece is connected to the positive electrode, under the action of the electric field, OH ions will continuously gather on the workpiece, resulting in the oxidation and corrosion of iron, aluminum, copper, zinc, titanium and tungsten, and the ionic state of the binder cobalt in the cemented carbide material dissolves in the water, forming a “softening layer” on the workpiece surface. The measures of increasing resistivity (from tens of thousands of Ohm? Cm to hundreds of thousands of Ohm? Cm) have been adopted to reduce the ion concentration as much as possible. Although they have played a certain role in improving the surface quality, they still cannot solve the problem of “softened layer” effectively. Anti electrolysis power supply is an effective technical means to solve the “softening layer” of workpiece. The anti electrolysis power supply adopts alternating pulse and the average voltage is zero, which makes the OH – ion electrode wire in the working liquid in the state of oscillation between the workpiece and does not tend to the workpiece and electrode wire, so as to prevent the oxidation of the workpiece material. The surface modification layer can be controlled below 1 μ m by WEDM with anti electrolysis power supply, which can avoid the precipitation and dissolution of cobalt in cemented carbide material and ensure the service life of cemented carbide die.

2. Nanosecond high peak current pulse power supply for slow wire processing

There are two kinds of metal erosion in EDM, melting and gasification. The wide pulse duration is long, which is easy to cause melting processing, poor surface morphology of the workpiece, thickened metamorphic layer, increased internal stress, and easy to produce cracks. When the pulse width is small to a certain value, the action time is very short, forming gasification processing, which can reduce the thickness of the modified layer, improve the surface quality, reduce the internal stress and avoid cracks. The pulse power supply used in the advanced low speed WEDM machine is only tens of NS in pulse width, and the peak current is more than 1000A, forming gasification erosion, which not only has high machining efficiency, but also greatly improves the surface quality.

Treatment of chip removal in deep hole machining of mould

The treatment method of chip removal in deep hole machining is as follows:

In order to remove the chips smoothly, the iron chips need to come out as thin strips and bring out small pieces. At the same time, the coolant is easy to enter. The grinding method of the drill can adopt the grinding method created by Ni Zhifu, who has three points and seven edges (group drilling for the sake of not highlighting individuals in the Cultural Revolution). The simple grinding method of the deep hole of the mold is

1. Increase the included angle of the drilling edge to 130-140 degrees to increase the chip thickness and change the direction of chip discharge (the direction of chip discharge is perpendicular to the edge)

2. Grind the transverse edge to reduce the axial cutting tool and generate an angle at the cutting edge against the core to facilitate chip separation.

3. If the drilling diameter is large, the chip separating groove can be grinded on one side of the cutting edge, which should be one wider, so as to balance the cutting force of two cutting edges. If the diameter is large, the chip separating groove can be grinded on two cutting edges.

4. Make an angle of 1 mm 45 degrees at the outer corner of the cutting edge to reduce wear and improve the finish.

5. The drilling speed is slightly lower, and the feed amount should be larger, so that the chip thickens and is discharged in strips.

6. The nozzle of the coolant should face the hole inward so that the coolant can enter the cutting area,

Die deep hole manufacturers found that when the hole diameter ratio is more than 8 times larger, it’s best to drill on a special deep hole drilling machine, with very high efficiency. I once tried to produce lathe spindle diameter 32, length about 850mm, material 45 steel in only 13 minutes.

Deep hole drilling is divided into two types: external chip removal and internal chip removal;

For the smaller diameter, the external chip removal method is adopted, because the drill pipe is too small. For the larger diameter hole, the internal hole of drill pipe has enough space for chip removal. High pressure oil is pressed between the hole wall and the drill pipe to discharge the chip and heat from the rod. The drill bit is made of special general hard alloy, with two parts of the direction and chip edge, The height and width of the chip breaking groove depend on the material of the workpiece and the feed rate to ensure that the chip shape is tight and small C shape or tile shape is better.

Treatment of chip removal in deep hole machining of mould

The treatment method of chip removal in deep hole machining is as follows:

In order to remove the chips smoothly, the iron chips need to come out as thin strips and bring out small pieces. At the same time, the coolant is easy to enter. The grinding method of the drill can adopt the grinding method created by Ni Zhifu, who has three points and seven edges (group drilling for the sake of not highlighting individuals in the Cultural Revolution). The simple grinding method of the deep hole of the mold is

1. Increase the included angle of the drilling edge to 130-140 degrees to increase the chip thickness and change the direction of chip discharge (the direction of chip discharge is perpendicular to the edge)

2. Grind the transverse edge to reduce the axial cutting tool and generate an angle at the cutting edge against the core to facilitate chip separation.

3. If the drilling diameter is large, the chip separating groove can be grinded on one side of the cutting edge, which should be one wider, so as to balance the cutting force of two cutting edges. If the diameter is large, the chip separating groove can be grinded on two cutting edges.

4. Make an angle of 1 mm 45 degrees at the outer corner of the cutting edge to reduce wear and improve the finish.

5. The drilling speed is slightly lower, and the feed amount should be larger, so that the chip thickens and is discharged in strips.

6. The nozzle of the coolant should face the hole inward so that the coolant can enter the cutting area,

Die deep hole manufacturers found that when the hole diameter ratio is more than 8 times larger, it’s best to drill on a special deep hole drilling machine, with very high efficiency. I once tried to produce lathe spindle diameter 32, length about 850mm, material 45 steel in only 13 minutes.

Deep hole drilling is divided into two types: external chip removal and internal chip removal;

For the smaller diameter, the external chip removal method is adopted, because the drill pipe is too small. For the larger diameter hole, the internal hole of drill pipe has enough space for chip removal. High pressure oil is pressed between the hole wall and the drill pipe to discharge the chip and heat from the rod. The drill bit is made of special general hard alloy, with two parts of the direction and chip edge, The height and width of the chip breaking groove depend on the material of the workpiece and the feed rate to ensure that the chip shape is tight and small C shape or tile shape is better.

Deep hole processing method of mould

The common processing methods of deep hole drilling are as follows

① The cooling water hole and heating hole of small and medium-sized mold are usually processed on vertical drilling machine and radial drilling machine by common drill or lengthened drill. During processing, it is necessary to timely discharge and cool the chips, with small feed rate to prevent hole deflection.

② The holes of medium and large moulds are generally processed on radial drilling machine, boring machine and deep l drilling machine. The more advanced method is that they can be processed together with other holes on the machining center machine tool.

③ Long low precision holes can also be drilled from both ends after marking.

④ The holes with high requirements for verticality shall be guided by certain technological measures, such as the use of drilling jigs.

When drilling deep holes, attention shall also be paid to:

a. When the drilling depth is 3 times of the diameter, it is necessary to lift the drill bit for chip removal, and then every time a certain depth is entered, the drill bit shall exit for chip removal, so as to prevent the drill bit from breaking due to chip blocking.

b. When the depth of some deep holes exceeds the total length of the bit or is deeper, lengthening rod bit or connecting rod bit can be used for drilling. These two kinds of bits can be purchased or self-made.

c. For some special deep holes, such as the processing of some through holes, special equipment is generally used or carried out on the machine tool. At this time, special lengthening rod drill bit is required. This kind of bit needs to be developed on its own according to the specific conditions of the workpiece. In general, deep hole machining process, it is impossible to process all the hole depths with a single cutting. It is necessary to feed several times to solve the problems of chip removal, cooling, etc. and the machining accuracy is low. Gun drill can solve these problems, so deep holes with diameter less than 20 mm, such as cooling water holes, can be processed by gun drill. WeChat official account: hcsteel gun drill. The working part of gun drill is made of high-speed steel or hard alloy and seamless steel pipe by butt welding. During operation, the workpiece rotates the drill bit to feed, and at the same time, the high-pressure cutting fluid is injected from the tail of the drill pipe. After the cutting area is cooled, the cuttings are washed out along the drill pipe groove.

The characteristics of gun drilling hole are as follows:

① The ratio of length to diameter of the hole can reach 100:1 or greater;

② High production efficiency, only one process can obtain high quality holes;

③ In a long period of continuous machining, the change of hole size is very small (within 0.02-0.05mm);

④ When the hardness of workpiece material is up to 45hrc, it can still be processed;

⑤ The quality of the hole is very good, usually no further processing is needed;

⑥ Do not need skilled operation technology;

⑦ The tool durability is 10-15 times higher than that of twist drill, and it can process hundreds to several dry workpieces every time;

⑧ The position accuracy of the hole is the same as that of the adjustment.

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