What are the precise machining tips you need to know?
the process of production and processing of the machinery industry,
although there are some details that are insignificant, if we can learn
from it, we can use it in turn, use our brains and try our best to help
our work. The following Kingship summarizes several tips for you to refer to.
1: Remove the jaws of the vise, process two threaded holes for two M4s,
attach two steel plates with a 1.5 mm thickness to the jaws, and rivet a
0.8 mm thick hard brass plate with aluminum blind rivets. 3 Fasten it to the jaws with M4 countersunk screws 1 to form a durable soft jaw. This also protects hardware components from being pinched and is interchangeable.
2: The use of magnets to absorb small parts (fees) is not easy to
absorb and take, can suck an iron plate 2 under the magnet 1, not only
can suck a lot of small pieces, but also pull the iron plate, the small
pieces will automatically Pour into the collection box is not enough to move the heart, but it is practical.
Tip three: pulley drive, the pulley and the skid often between the
skidding on the axle with ¢ 15 ~ 18mm Zoned nest drill a series of nest,
so that the formation of adsorption, to prevent slipping, turning waste
into treasure, the boss will reward.
Tip 4: When the Allen wrench 1 handle is short and cannot work, insert
a wrench with a slightly larger diameter than the wrench from a milling
slot into the slot, which can be used as a long handle.
5: As for the tightening of the workpiece, it is the first position and
then the clamping, but for a workpiece, the first clamping and
repositioning, because the clamping will certainly try to deform the
workpiece, so it should be clamped and repositioned, for 6 points Positioning, find limit its degree of freedom.
tips and knocking are mostly found in the normal work of the staff,
these tips, on the surface does not really represent anything, but when
you use more, it can bring a lot of benefits for companies including
themselves. I hope everyone in the future to find more of these tips and tricks.
What are the commonly used precision machining materials? How to choose?
general, precision machining of materials commonly used in two
categories: metal processing; non-metallic materials processing (such as
ceramics, plastics, etc.); hardness descending: stainless steel>
cast iron> copper> aluminum, said several commonly used Right, I hope it works for everyone.
1,45 - high-quality carbon structural steel, is the most commonly used carbon quenched and tempered steel.
features: The most commonly used carbon quenched and tempered steel,
good mechanical properties, low hardenability, easy to crack when water
quenching. Small parts should be quenched and tempered, large parts should be normalized.
Application examples: It is mainly used to make high-strength moving parts such as turbine impeller and compressor piston. Shafts, gears, rack, worm and so on. Welding attention to preheating before welding, stress relief annealing after welding.
2, Q235A (A3 steel) - the most commonly used carbon structural steel.
Main features: High plasticity, toughness and weldability, cold
stamping properties, as well as a certain strength, good cold bending
Application examples: Widely used for the general requirements of the parts and welding structure. Such as the less force rod, connecting rod, pin, shaft, screws, nuts,
ferrules, brackets, base, building structures, bridges and so on.
3,40 Cr - one of the most widely used steel grades, is alloy structural steel.
features: After quenched and tempered, it has good comprehensive
mechanical properties, low temperature impact toughness and low notch
sensitivity, good hardenability, high fatigue strength when oil-cooled,
and easy-to-shape parts with water cooling Cracks,
cold plasticity moderate, tempered or quenched and tempered and
machinability is good, but the weldability is not good, easy to crack,
preheat before welding should be 100 ~ 150 ℃, generally used in the
quenched and tempered state, but also Carbonitriding and high-frequency surface hardening.
example: quenched and tempered for the manufacture of medium-speed,
medium-loaded parts, such as machine gears, shafts, worms, spline
shafts, thimble sets, quenched and tempered and used for the manufacture
of high surface hardness, resistance Grinding
parts such as gears, shafts, spindles, crankshafts, spindles, sleeves,
pins, connecting rods, screw nuts, intake valves, etc. are used for
heavy and medium speed impact after quenching and tempering Parts
such as oil pump rotors, sliders, gears, spindles, collars, etc., are
hardened and tempered for the manufacture of heavy duty, low impact,
wear resistant parts such as worms, spindles, shafts, Nitrogen osmosis then create larger size, high temperature impact
toughness of the transmission parts, such as shafts, gears and so on.
4, HT150 - gray cast iron
Application examples: gear box, machine bed, box, hydraulic cylinder,
pump body, valve body, flywheel, cylinder head, pulley, bearing cap,
5,35 - a variety of standard parts, fasteners commonly used materials
Main features: appropriate strength, good plasticity, high cold plasticity, weldability is acceptable. Cold upsetting and drawing can be localized. Hardenability is low, normalized or tempered before use
Application examples: suitable for the manufacture of small section
parts, can withstand greater load of the parts: such as crankshaft,
lever, connecting rod, hook and so on, all kinds of standard parts,
6,65Mn - commonly used spring steel
Application examples: small size of various flat, round spring,
cushion spring, spring winding, spring ring can also be made, gas
spring, clutch reed, brake spring, cold coil spring, circlip and so on.
7,0Cr18Ni9 - the most commonly used stainless steel (US steel 304, Japanese steel SUS304)
Features and applications: As the most widely used stainless steel
heat-resistant, such as food equipment, general chemical equipment,
originally in the industrial equipment
8, Cr12 - commonly used cold work die steel (the United States Steel D3, the Japanese steel SKD1)
and Applications: Cr12 steel is a widely used cold-work die steel,
which is a high-carbon, high-chromium type of martensitic steel. The steel has good hardenability and good wear resistance; as Cr12
steel carbon content of up to 2.3%, so the impact toughness is poor,
easy to brittle fracture, and easy to form uneven eutectic carbide;
steel due to good wear resistance, used in the manufacture of less
impact load by the requirements of high wear-resistant die, punch,
blanking die, cold heading die, cold extrusion die punch and die, drill Sets, gauges, wire drawing die, stamping die, rolling plate, drawing die and powder metallurgy with cold die.
9, DC53 - commonly used in Japan imported cold work die steel
and Applications: High strength and toughness cold work die steel,
Japan Datong special steel (strain) manufacturers steel. After high temperature tempering with high hardness, high toughness, good line cutting. 9 for precision cold stamping die, drawing die, rolling wire die, cold punching die, punch and so on
10, SM45 - Ordinary carbon plastic mold steel (Japanese steel S45C)
What are the precision machining methods?
parts processing is accompanied by continuous high-end production of
today's manufactured products, and the performance of the products also
begins to have higher requirements, and the inevitable event that
arises, because to improve the quality of the products, the parts
requirements of the products must be improved. Precision
machinery parts processing is a very delicate industry. Its production
process is complicated and the technology is delicate. Compared with
other machine tools, there is a very obvious gap, and the quality error
of products is very strict. So what are the precision machining methods?
1. According to the machine tool parts to the classification of precision machining methods
The important parts of the installation of machine parts
classification can be divided into: box, base, spindle, flange, sheet
metal and so on.
2. According to the production process of precision machining methods classification
Different equipments correspond to different processes. Generally, the
most common equipment is lathes, which contain CNC lathes and ordinary
lathes. CNC and general-purpose vehicles include planers, milling
machines, grinding machines, and wire cutting machines.
processing of precision parts is actually the process of changing the
size or performance of the products. According to the temperature
environment in which the parts are processed, the precision parts
processing can be divided into hot processing and cold processing. We call it cold working at room temperature, and we call it hot work at a high or low temperature.
above is the introduction of the method of precision machining, hoping
to bring you some help, if you have any questions, please call the
National Haixing Hing consultation Tel: 0755-29810218
How to arrange mechanical roughing and finishing?
In order to ensure the processing accuracy, rough, finishing the best separately. Because
rough cutting, the large amount of cutting, the workpiece by the
cutting force, clamping force, heat, and the processing surface has a
more obvious work hardening phenomenon, the workpiece there is a large
internal stress, if the rough, rough Continuously, the precision of the finished part is quickly lost due to the stress redistribution. For some high precision machining parts. After roughing and finishing, cryogenic annealing or aging treatments should also be arranged to eliminate internal stresses.
What are the reasons for the rough surface of precision metal parts?
physical factors, in the cutting process of the workpiece, the fillet
and the extrusion of the blade can deform the metal material, which will
cause the surface roughness to be seriously deteriorated. In the
processing of the plastic material, the chipping will form a chip due to
the formation of a chip. Tumor, and hardness is very high. The
appearance of the built-up edge is very irregular, so it is very easy
for the surface of the workpiece to appear uneven knife marks. This will inevitably increase the surface roughness of the product.
the process factors, from the perspective of our precision metal parts
processing technology, there are actually many factors that affect its
surface roughness, mainly the factors of the cutter, the workpiece
material, the numerical control processing conditions and other factors.
the geometric factors, mainly subject to the shape of the tool,
declination, declination, etc. will be affected by the surface
roughness. The above aspects should focus on what.
What are the advantages and disadvantages of CNC machining?
machining is the so-called CNC machining. First of all, we need to know
the principle of CNC machining. It is processed accurately by computer
control program commands. This program includes the entire process as
well as process parameters and displacement data for automation.
CNC machining advantages:
the CNC can process complex profiles without the need for complicated
tooling because it can be controlled by a program, or even process
unobservable machining parts, and can change the shape and size of a
part through a program. Product development and modification is very applicable.
by controlling the automation system through the CNC program, accurate
processing can be achieved with high accuracy and stability.
its production efficiency is also unmatched by ordinary processing
equipment, and it can achieve high efficiency in the case of diverse
types and small quantities.
Disadvantages of CNC machining:
disadvantage is that the numerically-controlled machine tool equipment
is expensive, and the quality requirements for the numerical control
operation and maintenance personnel are also high.
CNC machining generally follow what principles?
machining is a very rigorous job and requires operators with high
quality. Then what principles do CNC machining generally follow?
Control the length of the processing route to ensure that the shortest
processing route is adopted, thus reducing the idle travel time,
improving the processing efficiency and reducing the tool wear. At the
same time, when the shortest cutting feed route is arranged, the
rigidity and processing technology of the workpiece must be ensured. Claim;
2. Simplify the workload of numerical calculation as much as possible to simplify the processing procedure;
3, for some of the repeated use of the program should be achieved through subroutines;
4, must ensure the precision of the workpiece being processed and the surface roughness.
What is machining in the end?
Machining refers to the process of changing the dimensions or performance of a workpiece through various types of machinery. Broadly
refers to the process of manufacturing products by mechanical means;
narrowly refers to the use of lathes (milling machines (drilling machine
grinders (punching presses, die casting machines and other special
machinery and equipment for the production process of parts. According
to the temperature state of the workpiece being processed, divided into
cold and hot processing Normally, it does not
cause the processing of the chemical or physical phase change of the
workpiece at room temperature, and it is called cold processing.
Similarly, the processing above or below the normal temperature state
will cause the chemical or physical phase change of the workpiece to be
called hot processing. The difference between the
ways can be divided into cutting and pressure processing. Thermal
processing common heat treatment, calcined, casting and welding.
CNC lathe machining common forms have?
The first is: fixed lathe, mainly for processing unformed parts of the rotation;
second type is that the workpiece is fixed, and the lathe's horizontal
and vertical movements are processed accurately by the high-speed
rotation of the workpiece. Lathes, reamers, reamers, taps, dies and knurling tools can also be used for machining on lathes. Lathes
are mainly used to machine shafts, discs, sleeves and other workpieces
with rotating surfaces. They are the most widely used type of machine
tooling in machinery manufacturing and repair factories.
What are the precision metal parts processing technology performance?
properties: refers to the metal or alloy is suitable for casting some of
the process performance, including flow properties, full of casting
ability; shrinkage, the capacity of the casting solidification volume
contraction; segregation refers to the chemical composition of
Welding performance: refers to the
metal material by heating or heating and pressure welding method, the
two or more metal materials welded together, the interface can meet the
purpose of using the characteristics.
Top gas section performance: refers to the metal material can be granted to the top forging without rupture performance.
Cold-bending performance: refers to the metal material can withstand bending at room temperature without breaking performance. The
bending degree is generally expressed by the ratio of the bending angle
α (outside corner) or the bending diameter d to the material thickness
a. The larger a is or the smaller d / a is, the better the cold bending
property of the material is.
Stamping properties: Metal materials withstand the ability of stamping deformation without rupture. Stamping at room temperature called cold stamping. Test method to test with cupping test.
Forging performance: metal materials in the forging process can withstand plastic deformation without rupture ability.