2015年7月8日星期三
Power tools core applications electric drill rotary hammer application
Power tools core applications electric drill rotary hammer application
stone processing
in the case of stone processing, by combining the bad working conditions and with different requirements of such crafsmanship as cutting, polishing, hole-forming and craving etc. for tools.
we have developed an entirely new series products, e.g. stone cutting machine, angle grinder used especialy for stones.
1.stone hole-forming,cutting for dry and wet use
2.stone polishing, cutting, carving
3.stone craving, straight grinding
metal processing/metalworking
electric drill with a high rotation speed, saves both time and strength while ensuring the smoothness during the process object go trough the hole. angle grinders featured strenth and high rotation speed are widely used in the area of metal processing, e.g. automobile manufacturing, mold manufacturing, engineering machinery, aviation, ship manufacturing, track communications, wind and electricity, petrochemical insustries.
1. metal hole-drilling, threading
2. metal polishing, cutting
construction/ concrete construction
strong and durable, electric tools wildly used in the area of construction for structure destroying, drilling, cutting, datum positioning, gradient positioning, floorage measuring ,leveling and balancing.
1. wood drilling
2. bolt fastening
3. concrete drilling
4. leveling of doors and windows
5. distance measuring
house furnishing
power tools are mainly used in the area of house furnishing for reconstruction, installation, grooving, drilling, sheet milling, cupboard installation, leveling and balancing.
1. concret reconstruction
2. wall grooving
3. blanking
4. cupboard installation
furniture manufacturing/ woodworking
electric tools used for wood surface processing, including craving machines for shaving different smooth surfaces, highly effective sanders for polishing, and lithium electric drills for installation and fastening.
1. sanding of surface of wood
2. screw fastening
3. wood sawing
4. craving and deflashing of wood ware
FASTENING SOLUTIONS
Our technology-based engineered systems deliver innovative and integrated solutions to virtually any manufacturing challenge in the world. From automotive assembly and industrial construction to computers, mobile telecommunications and appliance manufacturing, we deliver the right engineered fastening and assembly solution, every time. This is why we are a global leader, and trusted by some of the world’s leading manufacturers.
Engineered Fastening systems are an integral part of cars, trucks, planes, trains, appliances and electronics around the world.
For every manufacturing process that requires a unique and customized fastening solution, we are there with the expertise and the experience to get the job done.
stone processing
in the case of stone processing, by combining the bad working conditions and with different requirements of such crafsmanship as cutting, polishing, hole-forming and craving etc. for tools.
we have developed an entirely new series products, e.g. stone cutting machine, angle grinder used especialy for stones.
1.stone hole-forming,cutting for dry and wet use
2.stone polishing, cutting, carving
3.stone craving, straight grinding
metal processing/metalworking
electric drill with a high rotation speed, saves both time and strength while ensuring the smoothness during the process object go trough the hole. angle grinders featured strenth and high rotation speed are widely used in the area of metal processing, e.g. automobile manufacturing, mold manufacturing, engineering machinery, aviation, ship manufacturing, track communications, wind and electricity, petrochemical insustries.
1. metal hole-drilling, threading
2. metal polishing, cutting
construction/ concrete construction
strong and durable, electric tools wildly used in the area of construction for structure destroying, drilling, cutting, datum positioning, gradient positioning, floorage measuring ,leveling and balancing.
1. wood drilling
2. bolt fastening
3. concrete drilling
4. leveling of doors and windows
5. distance measuring
house furnishing
power tools are mainly used in the area of house furnishing for reconstruction, installation, grooving, drilling, sheet milling, cupboard installation, leveling and balancing.
1. concret reconstruction
2. wall grooving
3. blanking
4. cupboard installation
furniture manufacturing/ woodworking
electric tools used for wood surface processing, including craving machines for shaving different smooth surfaces, highly effective sanders for polishing, and lithium electric drills for installation and fastening.
1. sanding of surface of wood
2. screw fastening
3. wood sawing
4. craving and deflashing of wood ware
FASTENING SOLUTIONS
Our technology-based engineered systems deliver innovative and integrated solutions to virtually any manufacturing challenge in the world. From automotive assembly and industrial construction to computers, mobile telecommunications and appliance manufacturing, we deliver the right engineered fastening and assembly solution, every time. This is why we are a global leader, and trusted by some of the world’s leading manufacturers.
Engineered Fastening systems are an integral part of cars, trucks, planes, trains, appliances and electronics around the world.
For every manufacturing process that requires a unique and customized fastening solution, we are there with the expertise and the experience to get the job done.
How do Hammer Drill Works? HAMMER DRILL MECHANISMS. How do IMPACT WRENCH works?
Hammer Drill, How It Works
Hammer drills have been around a long time. Hammer drills have been the choice for many operators when drilling into materials such as cement, concrete, brick, stone, block, and other masonry materials. The way the hammer drill works is to hammer as the drill bit is rotating. In theory they pulverize the hard material under the bit as the bit churns into the surface. In reality, the bit cuts into the surface with the help of a vibrating chuck. A masonry bit is used for drilling. The bits are exposed to tremendous friction as the operator bears down on the drill. The drill bit at the surface gets extremely hot. So, the very tip is made out of carbide steel by many manufacturers. Even though the tip is carbon steel, the tip of the bit get so hot that they discolor. If the tip of the bit is allowed to “blue”, the tip becomes brittle. Soon the operator notices chips in the bit tip. The bit tip then begins to break and drilling becomes hindered. In a short time, the operator notices that progress has stopped. There is a way to minimize this problem. Start drilling with a small bit first. Then drill the hole with progressively larger bits until the correct diameter is achieved.
HAMMER DRILL
PICTURE 1
OPEN HAMMER DRILL BODY
PICTURE 2
The picture above shows the various mechanisms inside of the hammer drill. In the center is the motor inside of the motor housing. In front of the motor is a cooling fan attached to the motor shaft.A bearing in front of the motor shaftsupporsthe fan.A rear bearing ishoused in black at the right side of the motor.
HAMMER DRILL MECHANISMS
PICTURE 3
In picture 3 above, the motor shaft is shown passing through the Hammer Mechanism body where there are bearings that support the shaft. The shaft ends in a Worm Gearthat transfers motion to a large reduction gear. In the center of the Large Gear is attached a second shaft which runs out, and is attached to, and drives the chuck. On the top of the drill is a rotary switch. The rotary switch selects one of two modes of operation. Position right, counterclockwise, selects the drill only mode. Position left, clockwise, selects drilling with hammering. There is a pin shown attached to the wedge and rides in a slot in the rotary switch. When the rotary switch is turned clockwise, the wedge moves downward and forces the Hammer Mechanism forward. This engages the hammer action.
HAMMER DRILL HAMMER MECHANISM
PICTURE 4
In the picture above, the Large Gear was removed from the drill and stood on the chuck. The drill body was stood on its end, and the Hammer Mechanism was moved out of alignment for viewing. Both the Large Gear and the Hammer Mechanism are ribbed. The Hammer Mechanism is stationary. The Large Gear turns and bumps along producing the hammer action.
HAMMER DRILL SPRING
PICTURE 5
The spring in Picture 5 above holds tension, allowing the hammer action. The shaft moves left and right causing the chuck to hammer the drill at the material while turning.
The problem with this kind of a design is the hammer mechanism. As can be seen in Picture 4 above, one ribbed surface is rotated against a stationary ribbed surface. At slow speed, the ribbed surfaces can actually fit into one another. As speed increases, the ribs have a tendency to walk or not fully engage as the Large gear turns or the spring weakens with age. This results in a shorter stroke of the chuck. In fact, at high speed, this hammer action is more of a vibrator than a hammer.
Hammer drills are notorious for drill bits coming loose while drilling. The vibration made by the cam causes the chuck to loosen on the drill bit.
There is an alternative to using a hammer drill that produces better results. An impact wrench contains a hammer that works very well in this application. For one, it has a much better hammer. Number two is the fact that under pressure it slows down minimizing heat buildup. Number three, the pneumatic version does not get hot as electric drills do. Unfortunately, you cannot attach a drill bit to an impact wrench directly. You will need a special chuck called a Cowan Chuck.
IMPACT WRENCH, How It Works, Interesting Things To Know
AIR OR PNEUMATIC TYPE
PICTURE 6
ELECTRIC TYPE
PICTURE 7
INSIDE OF AN AIR IMPACT WRENCH
PICTURE 8
In Picture 8 above, a pneumatic impact wrench is shown disassembled. Air is forced in the adapter and up through the handle.In Picture 9 below, the housing is turned on end so we can look inside. There are 2 holes inside on the bottom. Air is forced through one of the 2 holes determined by the position of the FORWARD/REVERSE CONTROL BUTTON/VALVE. Air passes through a hole in the mechanism to the rear plate. The rear plate then channels the air into the ROTOR CYLINDER where it comes in contact with the ROTOR BLADES. The blades sit loosely in the rotor.Gravity causes at least 1 of the 6 blades to extend out of the rotor that catches the airflow. This begins to turn the rotor. Centrifugal force moves the rest of the blades partially out of the rotor where they glide along the inside of the ROTOR CYLINDER. This aids the turning of the rotor. The central shaft of the rotor passes through a bearing housing. The end of the shaft has a spline in it. The spline forces the HAMMER CAGE and HAMMER to rotate with the rotor (See Picture 10 & 11.). The HAMMER rocks on a pin going through the upper part of the HAMMER and its HAMMER CAGE. Notice that the hammer has a cut out on the right side. That is because a rocking lever, overly slotted, rides there. The lever, rocking back and forth, causes the hammer to rock in and out.
IMPACT WRENCH HOUSING INSIDE VIEW
PICTURE 9
IMPACT WRENCH HAMMER - 2 VIEWS
PICTURE 10
IMPACT WRENCH INSIDE CLOSE UP
PICTURE 11
Here is how it works (refer to pictures 8, 10& 11). With no air pressure applied, the ANVIL is relatively free to turn in either direction. Application of air pressure forces the rotor to turn. The spline forces the rocker lever to move. This forces the HAMMER and HAMMER CAGE to rotate. The HAMMER rocks into the ANVIL’s slot. The ANVIL starts turning. As long as air pressure is applied, the HAMMER tries to remain engaged into the ANVIL’s slot.
What happens when the ANVIL meets resistance as with a bolt and socket? Pressure builds up in the ANVIL’s slot. The HAMMER has a matching grove in it so that it will fit into the ANVIL’s slot when rocked. It’s grove is slightly rounded so that when a lot of reverse pressure is applied, it will slip out of the grove. The HAMMER, CAGE, and ROTOR make 1 full revolution. Pressure is still applied. When the HAMMER meets the ANVIL’s grove again, it slams in giving a hammer blow to the ANVIL. If the ANVIL does not start moving with the HAMMER, CAGE, and ROTOR, the HAMMER slips out of the grove again. The process then repeats itself.
What happens when the ANVIL meets resistance as with a bolt and socket? Pressure builds up in the ANVIL’s slot. The HAMMER has a matching grove in it so that it will fit into the ANVIL’s slot when rocked. It’s grove is slightly rounded so that when a lot of reverse pressure is applied, it will slip out of the grove. The HAMMER, CAGE, and ROTOR make 1 full revolution. Pressure is still applied. When the HAMMER meets the ANVIL’s grove again, it slams in giving a hammer blow to the ANVIL. If the ANVIL does not start moving with the HAMMER, CAGE, and ROTOR, the HAMMER slips out of the grove again. The process then repeats itself.
A hammer action like this is great for bolts and nuts. With a drill chuck attachment, this device would make a good hammer drill. Why? An operator would apply some downward pressure. That gives us a “Y” vector. The hammer/rotating action gives us an “X” vector. Combining the 2 vectors gives us a resultant “Z” vector, as shown in the VECTOR DIAGRAM below. The resultant “Z” vector is longer than either the “X” or “Y” vectors. This means that the resultant force exerted for drilling is greater than the force of the impact wrench alone. That with very little operator pressure, the resultant force is never less than the force generated by the impact wrench. A hammer drill can be made from an impact wrench with the use of an Impact Wrench Drill Chuck. Such a chuck, called a Cowan Chuck .
X,Y, AND Z CHART
PICTURE 12
IMPACT WRENCH DRILL CHUCK
PICTURE 13
How a Power Drill Works Care and maintenance of a power drill
How a Power Drill Works
If you have a power drill, you can step up your capacity for fast, accurate work. By making use of attachments, you can make jobs such as sawing and sanding quicker and easier. You may eventually want to go a stage further and invest in more sophisticated power equipment for your workshop. Whatever the extent of your power ‘armoury’, you can learn from this section on Power Tools how to get the best from it.
How a drill works
Electrically powered tools suitable for home repairs and improvements range from the basic electric drill to more specialist and costly items such as radial arm saws and mechanical routers.
From the average householder’s point of view, the most satisfactory investment for general work and repairs is an electric drill power unit which can be used to drive a range of attachments. These can be bought as and when the need arises.
Drills are usually graded by their chuck capacity or, in other words, the maximum diameter of twist bit shank which can be secured in the chuck. This is usually 6.5 or 8 mm (¼ or 5/16 in) but can be greater on heavy-duty professional models.
The figures below, which give suitable drill speeds for various jobs, show that two-speed or variable-speed power units are more flexible than the less expensive single-speed units and are thus a wiser investment.
The cost of a single-speed unit together with a speed-reducing device is usually higher than for a variable-speed drill. Reducers for single-speed drills can be either electronic or mechanical.
Electronic reducers are fitted to the supply cable and allow the required speed to be selected by knob or dial control.
Mechanical reducers are fitted to the tools themselves, either instead of or into the chuck. Neither is as convenient to use as a variable-speed drill.
Most power tools are now fitted with double-pole switches which cut off both live and negative cores in the supply cable, thus completely isolating the motor electrically. When the switch is pressed to the `on’ position, current passes to one of the field coils and from there to the armature via the carbon brushes and commutator.
The armature main shaft speed of 20,000 revolutions per minute is geared down to approximately 3000 rpm. This reduction of speed increases the ‘torque’, or driving force. A fan is fitted internally to lower working temperatures.
Light-duty sleeve bearings are fitted to some power tools but better-quality models have needle or ball bearings, which are more suitable for continuous use.
Electrical connections in the motor are usually welded. The soldered connections on some models may fail if excessive heat or sparking occurs, for instance as a result of overloading or worn or clogged carbon brushes.
Care and maintenance of a power drill
A drop in speed while a power tool is in use, usually accompanied by a lowering of motor pitch, is a sign of overloading. To avoid the damage which this can cause, remove the tool from the work and run it at full revs for a few seconds before using it again This not only avoids abuse but also helps to reduce overheating.
Automatic cut-outs, which come into operation when overloading occurs, are fitted on some models. After a stoppage, these should be reset to ‘on’ only after removing the tool from the work.
Examine the carbon brushes periodically. These can be cleaned with turps substitute and, if necessary, with a very fine ‘0000’ abrasive paper. To ensure correct replacement, note the position of the brushes before removing them. Replace badly or unevenly worn brushes and have the entire tool overhauled by the manufacturer or his agent.
Undue commutator sparking indicates In electrical fault — leave this repair to a qualified expert.
Occasionally open up the gearbox, clean out the old grease and repack with the lubricant recommended by the maker.
Double-insulated tools are quite safe to use with the two-core cables provided, but tools with three-core cables must always be connected to a three-pin plug and socket.
Always use a drill with the cable hitched over your shoulder, out of the way.
Unless chuck keys are kept in the holders provided or tied to the supply cable, they are easily mislaid. A spare key is an invaluable accessory.
power tool electric drill application
Perfect technology from the inventor of the drill
drills embody the experience and quality gained from over 10 years of development – for perfect drilling results in all industries.
Metal
Interior work
Automotive
area of application
We are the experts when it comes to drills. encompassing 10 years of experience in enduring premium quality, whether rotary drills, hammer drills or cordless drill/drivers. There are drills for almost any situation, with different sizes, shapes, drilling diameters of up to 38 mm and speeds adapted precisely to the material. These tools are perfectly tailored to the work you do, the standards you need to meet and your way of working. Ergonomically shaped, lightweight, easy to operate and extremely durable, they are ideal for professional users. The optimised range of accessories and special system components underline the ingenuity and experience that goes into a drill.
Professional ZUOERD Power Tools for Trade & Industry
Professional ZUOERD Power Tools for Trade & Industry
The Power Tools division is the world market leader for portable electric power tools and power tool accessories. The professional power tools from ZUOERD are developed for professionals. When developing new power tools, Bosch has for years been working very closely together with real professionals who use power tools as part of their everyday work.
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