2019 – Page 46 – CNC Machining & Turning, Milling, Metal parts

General principles of numerical control programming tool path

Open and coarse: under the maximum load of machine tools, most of the cases should use as large a knife as possible as much as possible, and feed as fast as possible. In the case of the same knife, feed is inversely proportional to the amount of feed. Generally speaking, the load of the machine tool is not a problem. The principle of selecting the knife is mainly based on whether the product’s two-dimensional angle and the three-dimensional arc are too small. After selecting the knife, the knife length is fixed. The principle is that the length of the knife is greater than the depth of the processing, while the large workpiece should consider whether the chuck is interfered.

Light knife: the purpose of light knife is to meet the processing requirements of finishing the surface of the workpiece and reserve proper allowance. Similarly, as long as the knife can be used as soon as possible, because the knife needs a longer time to use the most suitable feed and feed. In the same feed, the larger and faster the transverse knife is, the amount of the feed is related to the smoothness after processing. The size of the feed is related to the surface shape of the surface. In the case of no injury, the minimum allowance is left, the maximum knife, the fastest speed, and the proper feed are used.

The clamping method of the lathe

1. All the clips are vertical and vertical.

2. Vise clamp: the clamping height should not be less than 10 millimeters. The height of clamping and the height of machining must be specified when machining the workpiece. The machining height should be about 5 millimeters above the vice plane. The purpose is to ensure firmness without damaging the vise. Such clamping is a general fixture, and the clamping height is also related to the size of the workpiece. The larger the workpiece, the higher the clamping height.

3, splint clamp: the splint is used on the worktable with the code boy code, and the work piece is locked with the screw on the splint. This clamp is suitable for the workpiece with insufficient clamping height and greater machining force. In general, the effect is good.

4, code iron clamping: when the workpiece is large, the clamping height is not enough, and it is not allowed to lock the wire at the bottom, it is clamped with code iron. This clip needs two times clamping, first four good corners, other parts processed, and then four sides, processing four corners. Do not let the workpiece loose during the two time of clamping. It can also be coded on both sides to process the other side.

5. Tool clamping: diameter 10mm or more, clamping length not less than 30mm, diameter less than 10mm, clamping length not less than 20mm. The cutting tool must be firmly clamped to prevent collision and insert directly into the workpiece.

Classification and application scope of lathe tools

1, according to the material:
White steel knives: easy to wear, used for copper and small steel.
Tungsten steel knives: used for cleaning corners (especially steel) and light knives.
Alloy knife: similar to a tungsten steel knife.
Purple knife; used in high speed cutting, it is not easy to wear.

2, according to the head of the knife:
Flat bottom knife: for plane and straight sides, clearance plane angle.
Knives: used for light and light knives in various surfaces.
Nose nose knife (unilateral, bilateral and five sides): used for coarse steel (R0.8, R0.3, R0.5, R0.4).
Rough leather knife: used for opening rough and paying attention to remaining allowance (0.3).

3, according to the knife pole:
Straight bar knife: the straight bar knife is suitable for various occasions.
Oblique bar knife: but it is not suitable for straight face and slope with less than the slope of the rod.

4. Divide the blade by the blade:
Two blades, three blades, four edges, the more the number of edges, the better the effect. But the more work done, the corresponding adjustment of speed and feed, the longer the number of blades and longer life.

5. The difference between a ball knife and a flying knife.
Ball knife: the concave ruler is smaller than the ball ruler. When the plane ruler is smaller than the ball R, the light is not light.
Flying knife: the advantage is to clear the bottom angle. Small partners who like machinery can focus on intuitive mechanical micro signals. The comparison of the same parameters: the V=R* Omega speed is much faster (flying knife), the force is much brighter, the flying knife is used more for the equal height, and sometimes the flying knife does not need the medium light. The shortcoming is that the concave size and plane ruler are less than the diameter of flying cutter.

The practice of CNC with EDM and copper

1. Under what circumstances do you need to do copper?
The knife must not be removed from the copper Gong. It will not be removed in a bronze Gong. The shape is convex and needs to be divided again.
The knife can go down, but it is also necessary to make copper Gong if it breaks easily. This depends on the actual situation.
The products requiring sparkle pattern need to be made of copper.
* copper can not be made, the bone position is too thin and too high, easy to wear and easy to deform, deformation and spark deformation during processing.
The surface of the copper Gong (especially the curved surface will be very uniform) can overcome many problems in the fine Gong and many problems in the drawing.
It is necessary to make coarse copper Gong when precise shape or allowance is required.

2, the practice of copper public
Choose the surface of the copper public, fill the surface of the supplement, or extend the surface of the extension to ensure that all the edges of the bronze are larger than the edges of the punch and do not hurt the surface of the other products at the same time. The boundary is then projected to the support surface; the size of the reference frame is fixed and the surface is cut off, and the copper graph is basically completed. The material: length * width * height, length and width more than Ymax and Xmax as reference frame, the length and width of the actual copper material must be larger than the reference frame on the map. The theoretical size of the copper plate is higher than that of the copper standard plus the height of the reference frame plus the clamping height.

Application of welding technology of rail welding machine in chemical machinery manufacturing

Welding rail welding is a science and technology rising early in the twentieth Century. It has been widely used in aviation, aerospace, atomic energy, chemical industry, shipbuilding, marine engineering, electronic technology, architecture, transportation, electric power, machinery manufacturing and other industrial sectors.
According to the characteristics of welding process, metal welding can be divided into two categories: fusion welding and pressure welding. Each type can be subdivided into many methods, as shown in table 1-1..
Most of the typical machines, containers and equipment in the chemical machinery of the rail welding machine are welding structures, and welding is the key process in the manufacturing of chemical machinery. It directly affects the quality, productivity and cost of the products. In the manufacturing process of chemical machinery, especially the manufacture of pressure vessels, the welding method is mainly by melting and welding, and the manual electricity is used. Arc welding, submerged arc welding, electroslag welding, gas shielded arc welding, plasma welding, especially the current methods of pressure vessel welding. The application of electron beam welding and laser welding in chemical machinery manufacturing is still in the stage of research and trial. The principles and uses of commonly used welding methods for pressure vessels are also studied.
The welding technology of rail welding machine can be widely applied in chemical machinery manufacturing, mainly because it has many characteristics different from other manufacturing processes. Compared with the structure of riveting, casting and forging.

Selection of hardware accessories for handbags

A handbag and bag hardware product quality, an important part is its quality, the quality determines the flexibility, durability and life of various components. General metal parts generally feel bad, manual parts rough, long time is prone to problems.
Handbags, bags and hardware products should choose high quality hardware accessories. The processing of inferior hardware accessories will make the bag and bag open not flexible, push, shut, slip, droop or even fall off, bring troubles and inconvenience to the consumers. The price, grade and life of handbags, bags and hardware accessories are the key factors restricting the value and life of handbags.
When buying hardware buckle, hardware lock, metal hand pull (hand handle), corner protection, and other handbag and bag hardware accessories, it is pushed and pulled several times, feeling its sliding, open and smooth. A lock with strong safety performance is selected and purchased. When you purchase, you can use the key to insert several times to see if it is smooth, whether the surface is smooth or not, and whether the switch is saved. When choosing good cosmetic bags and hardware accessories, it mainly depends on whether the appearance is defective, how the electroplating luster is, whether the feel is smooth or not.

Discussion on the main energy saving properties of the rotary vane vacuum pump

The rotary vane vacuum pump is a high vacuum pump. It can be used alone or as a front pump for other high vacuum pumps or ultra high vacuum pumps. It has been widely used in metallurgy, machinery, military industry, electronics, chemical industry, light industry, petroleum and medicine. Below, Shenzhen rotary vane vacuum pump manufacturers discuss with you about the main application quality of rotary vane vacuum pump.

The speed regulation of the 1. rotary vane vacuum pump is one of the measures to ensure the running of the rotary vane vacuum pump in the high efficiency area. In order to adapt to the different working conditions, change the performance curve of the rotary vane vacuum pump, besides the impeller cutting, the speed regulation is also a common method.

2. in view of the difference between the rated lift and the actual running head of the rotary vane vacuum pump, it is an effective way to improve the operating efficiency of the rotary vane vacuum pump by cutting the outer diameter of the working wheel, reducing the lift and flow to make it consistent with the actual lift, and changing the design work point of the rotary vane vacuum pump.

3. reducing the roughness of the overflow component of the rotary vane pump, reducing the friction loss of the flow, and polishing the inner surface of the impeller and the inner surface of the pump, can improve the efficiency of the rotary vane vacuum pump, and the energy saving is about 1%. If the coating is coated with smooth coating, the energy saving effect will be more obvious to about 5%.

IMG_1723

4. the cutting of the impeller: the rated lift of the rotary vane pump in the pumping station is not consistent with the actual lift in the water supply plant because of some changes in the rated lift of the rotary vane pump. The rotary blade vacuum pump impeller cutting is a contradiction between the type of the rotary vane vacuum pump, the limitation of the variety specifications and the diversity of the water supply to the image. Selection method. It enlarges the application range of rotary vane vacuum pump and adjusts the working characteristics of rotary vane vacuum pump by cutting impeller to make it work in a reasonable range.

5. compared with the effect of several measures to implement energy saving, in addition to adjusting the reasonable allocation of flow and lift, cutting the working wheel, the cost of applying smooth coating is lower and the efficiency is the highest.

6. other: mainly reduce the mechanical loss of the rotary vane vacuum pump, such as the friction loss of the shaft seal and bearing, and use the soft sealing cushion, and pay attention to reducing the transmission loss of the rotary vacuum pump. In addition, the scientific and economic dispatch of the management layer can improve the water level of the front pool, pay attention to the balance of water production and water supply in the peak period, make a comprehensive analysis on the pump house unit in time and optimize the combination to make the rotary vacuum pump unit run at the best operating point.

Precautions for the use of horizontal tension test machine

There are usually computer controlled electro hydraulic horizontal tensile testing machines, microcomputer controlled servo tension testing machines, and KRDL-D series horizontal tensile testing machines. Horizontal tensile testing machine is more complicated than that of electronic universal testing machine. The following are 8 requirements for the correct use of horizontal tensile testing machine.

1. do not start the test, do not click the “start” test button.

2. every time you enter the program, if there is any abnormal indication or default load value, it is not necessary to carry out the test with reference to the troubleshooting method. The load values of the TT & C system must be zero (no zeros) at every time they enter the test interface.

3. using the cylinder reset button can make the cylinder piston up or down to the set position. When the displacement shows the position value greater than the set position, the piston will drop when the cylinder reset button is clicked; conversely, the piston will rise. Attention should be paid to whether the actual position of the piston is in accordance with the position of the displacement display, and avoid the actual position of the cylinder when it is placed in a high position.

4. after clamping the sample, do not adjust the load value to zero.

5. clip the extensometer, pay attention to pull out the positioning pin and then adjust the zero. When picking up the extension time, pay attention to insert the positioning pin, prevent the extensometer because of overload.

6. if the sample is broken, if the program does not withdraw from the test condition and indicates the end of the test, it must immediately click the stop button to withdraw from the test state.

7. after completing the test exit procedure, the power supply should be cut off after WINDOWS shutdown, and the oil pump will be turned off and the cylinder will fall to the bottom.

8. when the computer is moving, pay attention to the plug.

Development trend of automatic spraying equipment

In order to improve the production efficiency and product quality of spraying, automatic spraying equipment has been introduced to replace manual spraying, and the product has been produced in batches. This has made the industry develop rapidly. So, what’s the development trend of this automatic spraying equipment? Look at the trend analysis of Shenzhen giant automatization technicians on intelligent automatic spraying equipment.
1, the trend of performance
Compared with the traditional mechanical spraying, automatic spraying has 2 outstanding advantages: it can reduce the number of spray guns by about 30% to 40%, and improve the speed of the spray gun. In order to adapt to high speed spraying, high speed rotary spray gun is used when spraying the inner surface and spraying second metal paints.
2, the trend of control
The function of the robot is to control the spray gun so as to maintain the correct angle and constant distance between the spray surface and the spray surface (usually 200mm). The 3D model of the spray object is processed by special software, and the moving path and corresponding spraying parameters of the spray gun are determined. These data are then transmitted to the robot controller to control the robot’s movements during the whole spraying process.
3. Trend of application
In the process of spraying the outer surface, the robot is placed on the elevating track and is free to close to the surface of the spraying body, so the operating space can be reduced and the operating cost can be reduced. In the transformation of old factories, if the automatic spraying equipment is replaced by this method in this way, the original spray room will remain unchanged. This can not only reduce the cost of transformation, but also shorten the construction period. In the inner surface spray chamber.

The use of high speed dry type composite machine

The high speed dry compound machine is suitable for the glass paper, BOPP, PET, PVC, PE, aluminum box, paper and so on. The two layers are combined to produce high strength, high insurance, and resistance to cooking and so on. Characteristics of high speed dry type composite machine:
1. the main engine retractable coil and gluing and oven motor are all equipped with variable frequency motor.
2. full automatic seven motor tension control system (pendulum roller, encoder).
3. the five axis pneumatic cone is equipped with anilox roller, which saves time and convenience.
4. static balance aluminum alloy guide roller, closed oven, energy saving, quick drying, automatic constant temperature control system.
5. oven section gas cap, safety brace and explosion-proof safety door device.
6. the double positions of the retractable rolls are automatically cut and connected, and the two winding automatic correcting device is adopted.
7. glue circulation system, pneumatic back pressure mobile scraper, inflatable type loading and unloading shaft. 8. double roller double layer oil circulation heating, uniform heating and stable control accuracy.