Explain in detail the relevant knowledge of cold drawn tubes and honed tubes

Quilted pipe is a kind of high-precision steel pipe after being hardened by cold drawn pipe or hot rolled pipe. Due to the advantages of no oxide layer on the inner and outer walls of the quilting pipe, no leakage under high pressure, smooth surface of the inner wall, cold bending, flaring, flattening without cracks, etc., it is mainly used to produce pneumatic or hydraulic cylinder products. The quilting tube has metal elements such as carbon C, silicon Si, manganese Mn, sulfur S, phosphorus P, chromium CR and so on.

"Fine drawing", which can be said to be a precision "cold drawing", has high dimensional accuracy, and can be pulled by chain or hydraulic pulling, but the premise is to ensure dimensional accuracy. The small specifications are mainly the general wall thickness of the chain pulling machine is larger, and the general wall thickness of the hydraulic drawing machine is greater than 5mm for large specifications, and the dimensional accuracy of the drawn steel pipe is higher than that of the hot-rolled pipe. It is generally used on hydraulic cylinders.

Finishing of the finished surface with an oil stone (also known as a honing strip) embedded in the honing head (see Cutting). Honing is mainly used for processing various cylindrical holes with a bore diameter of 5 500 mm or more, such as cylinder barrels, valve holes, connecting rod holes and box holes, etc., with a ratio of hole depth to bore diameter of 10 or even more. Under certain conditions, honing can also process cylindrical, flat, spherical and tooth surfaces.

The surface roughness of cylindrical honing can generally reach microns, and the surface roughness of cylindrical honing can reach below microns, and the geometric accuracy can be improved slightly, and the machining accuracy can reach IT7 4. The surface quality of flat honing is slightly poor.

Honing machine is generally used, and the spindle of the machine tool and the honing head are generally floating connections; However, in order to improve the ability to correct the geometry of the workpiece, rigid joints can also be used. When honing the hole, the outer circumference of the honing head is generally inlaid with 2 10 oil stones, which are driven by the spindle of the machine tool to rotate in the hole, and at the same time make a linear reciprocating motion, which is the main motion; At the same time, the spring or hydraulic pressure in the honing head controls the uniform outward expansion of the oil stone, and the radial feed is carried out on the hole wall to be processed.

1. All cold drawing and honing are two processes, one is the process of extrusion cold forming, and the other is the process of internal hole grinding. Generally, this is the front and rear process in the production of hydraulic cylinder barrels.

Honing pipe is made of hot-rolled pipe through cold drawing or cold rolling in honing and other processes, generally used in the cylinder barrel of hydraulic cylinders, is a high-precision steel pipe material, set the outer wall without oxide layer, withstand high pressure without leakage, high precision, high finish, cold bending without deformation, flaring, flattening without cracks and other advantages.

Honing tubes are honed with cold-drawn tubes, and special equipment is required to hon.

The domestic grinding and polishing industry has done a better job in Beijing's Throwing Lisi Technology, and quite a lot of high-tech masters are there.

The processing equipment for finishing rolled pipes is "steel pipe cold rolling mill".

The processing of cold-drawn pipes is a "steel pipe cold-drawn machine".

Honing tubes are honed (on a honing machine) on top of cold-drawn or finished tubes.

In terms of accuracy and surface, the best empty oak on the surface and the fine bucket spike is the honed tube, followed by the finished rolled tube, and finally the cold drawn tube, (if you add another hot-rolled tube, then the worst surface and size is the hot-rolled tube).

There are too many classification methods for steel pipes, which can be divided into safety uses, processing methods, and material components.

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Honing pipes are seamless steel pipes that have been hardened.

Honing is a kind of machining process, through the honing head to the cold drawn tube inner hole reciprocating high-speed grinding process, so that the inner hole to meet the required tolerance size and surface roughness requirements.

According to the customer's requirements, the honing process can reach the tolerance range (such as H7, H8, H9, etc.), the roughness can be reached, the ovality can reach the range of 3 5 wires, and the length can reach up to 8m.

In terms of materials, generally seamless pipes can honing any material with materials.

The honing tube is a tubular honing head.

The so-called cold drawingThe advantage is that the residual stress is larger, and the cold drawing can not be pulled for too long, and the toughness and tensile strength can be improved to obtain better mechanical properties.

Cold drawing (rolling) seamless steel pipe process: round tube blank heating, perforation, heading, annealing, pickling, oiling (copper plating), multi-pass cold drawing (cold rolling) billet tube, heat treatment, straightening, hydrostatic test (flaw detection), marking, warehousing.

Difference Between Cold Drawn and Cold Drawn:Cold drawing and cold drawing are two different methods of cold working metals, and they are not the same concept. Cold drawing refers to the method of applying tensile force at both ends of a metal material to produce tensile deformation of the material; Cold drawing refers to the method of applying pulling force at one end of the material to pull the material through a mold hole, and the hole diameter of the mold should be smaller than the diameter of the material.

Cold drawing processing makes the material in addition to tensile deformation and extrusion deformation, cold drawing processing is generally carried out on a special cold drawing machine. Cold-drawn materials perform better than cold-drawn materials.

Cold-rolled pipe is a kind of steel processed under a series of cold drawing, cold bending and other technologies at room temperature. Compared with cold-rolled pipes, hot-rolled pipes are a kind of steel that is processed above the recrystallization temperature. There are many differences between cold-rolled pipes and hot-rolled pipes, so let's introduce their differences to you for easy understanding.

The difference between hot-rolled pipe and cold-drawn pipe is 1:

When making cold-rolled pipes, its cross-section can have a certain degree of bending, and bending is conducive to the bearing capacity of cold-rolled pipes. However, when making hot-rolled pipes, its cross-section should not be partially bent, which will affect its service life.

The difference between hot-rolled pipe and cold-drawn pipe is two:

Due to the difference in the manufacturing process of cold-rolled pipes and hot-rolled pipes, their dimensional accuracy, accuracy, and surface finish are also different. Generally speaking, cold-rolled pipes have higher precision and much better surface finish than hot-rolled pipes.

There are three differences between hot-rolled pipes and cold-drawn pipes

The manufacturing process of cold-rolled pipe is different from that of hot-rolled pipe. When making and forming cold-rolled pipes, they need to go through pipe chucking process, heating treatment, perforation technology, hot rolling process, heading treatment, pickling engineering, phosphating treatment, cold drawing process, annealing treatment, straightening treatment, pipe cutting process, as well as inspection of finished products and packaging treatment. Hot-rolled pipes, on the other hand, need to undergo pipe chuck process, heat treatment, perforation forming, pipe rolling treatment, sizing treatment, cooling bed treatment, straightening treatment, switching treatment, and finally inspection and packaging.

From these introductions, it can be seen that there are certain differences in their technological procedures.

The difference between hot-rolled pipe and cold-drawn pipe is four

There is also a certain difference in the cross-sectional distribution of cold-rolled and hot-rolled pipes, which is due to the different causes of residual stress during molding. This results in some bending of the residual stress of the cross-section of the cold-rolled pipe, while the residual stress of the hot-rolled pipe belongs to the thin film type.

The difference between hot-rolled pipe and cold-drawn pipe is five:

Because the manufacturing process of hot-rolled pipe and cold-rolled pipe is different, the hot-rolled pipe sold on the market is divided into hot-rolled seamless steel pipe and hot-rolled welded steel pipe; The cold-rolled pipe can be divided into cold-rolled seamless steel pipe and cold-rolled welded steel pipe, and cold-rolled seamless steel pipe can be divided into two types: round pipe and special-shaped pipe.

In fact, the difference between hot-rolled pipes and cold-rolled pipes is not very big after forming, and their mechanical properties are similar. Finally, I would like to remind everyone that if you are willing to buy these pipes, you must choose a more formal, strong strength, and good reputation manufacturer to buy, so as to ensure the quality and life of the pipes.

Cold Drawn Pipe or Cold Rolled Precision Seamless Pipe (GB3639-2000) is a cold-drawn or cold-rolled precision seamless steel pipe with high dimensional accuracy and good surface finish for mechanical structure and hydraulic equipment.

High-precision cold-drawn precision steel pipe is a new type of high-tech energy-saving product. The promotion and application of high-precision cold-drawn precision steel pipes to save steel, improve processing efficiency, and save energyThe so-called high-precision cold-drawn pipes refer to the inner and outer diameter dimensional accuracy (tolerance range) strict, the internal and external surface finish, roundness, straightness, and uniform wall thickness of the fine, the main technical indicators of the high-precision cold-drawn pipes produced by this technology have met or partially exceeded the requirements of the national standard GB8713-88 and the international standard ISO4394 I-1980 (E). See the table below for details

The main technical indicators and standard comparison table items actually reach GB8713-88 ISO4394 I inner diameter size tolerance h8 h9 h10 h8 h9 h10 h8 h9 h10 h8 h9 h10 straightness a: a: b:

1/1000 b: 1/1000 c: c:

Wall Thickness%10 Wall Thickness%10 Wall Thickness%5 Wall Thickness Deviation Roundness Not specified.

Hot Tube refers to the pipe fittings produced by the hot rolling process, which is a common mechanical structural part.

Hot rolling refers to rolling that takes place above the recrystallization temperature. The hot rolling process significantly reduces energy consumption and costs. During hot rolling, the metal has high plasticity and low deformation resistance, which greatly reduces the energy consumption of metal deformation, and can improve the processing technology performance of metals and alloys, that is, the coarse grains in the casting state are broken, the cracks are healed significantly, the casting defects are reduced or eliminated, the casting structure is transformed into the deformation structure, and the processing performance of the alloy is improved.

Seamless steel pipes are divided into two types: hot-rolled and cold-rolled (dialed) seamless steel pipes.

Hot-rolled steel pipes are divided into general steel pipes, low and medium pressure boiler steel pipes, high-pressure boiler steel pipes, alloy steel pipes, stainless steel pipes, petroleum cracking pipes, geological steel pipes and other steel pipes.

In addition to general steel pipes, low and medium pressure boiler steel pipes, high-pressure boiler steel pipes, alloy steel pipes, stainless steel pipes, petroleum cracking pipes and other steel pipes, cold-rolled seamless steel pipes also include carbon thin-walled steel pipes, alloy thin-walled steel pipes, stainless steel thin-walled steel pipes, and special-shaped steel pipes. The outer diameter of the hot-rolled seamless pipe is generally greater than 32mm, the wall thickness, the outer diameter of the cold-rolled seamless steel pipe can reach 6mm, the wall thickness can reach, the outer diameter of the thin-walled pipe can reach 5mm, the wall thickness is less than, and the cold-rolled pipe has higher dimensional accuracy than hot-rolled.

General seamless steel pipe: It is made of low-alloy structural steel such as high-quality carbon-knotted steel, 16mn, 5mnv or 40cr, 30crmnsi, 45mnb, mnb and other alloy steels, and is mainly used for fluid transportation pipelines.

Seamless pipes made of medium carbon steel such as CR are used to make mechanical parts, such as stressed parts of automobiles and tractors. Generally, seamless steel pipes should be used to ensure strength and flattening test. Hot-rolled steel pipes are delivered in hot-rolled or heat-treated condition; Cold rolled is delivered in heat-treated condition.

The precision of the hot-drawn pipe is lower than that of the cold-drawn tube, and the cold-drawn tube will have oil to lubricate it during the extubation process, so there will be oil on the surface of the cold-drawn tube, and the surface of the cold-drawn tube is more delicate than the hot-rolled tube, and the hot-rolled tube is rougher.

Cold-drawn or cold-rolled precision seamless pipe (GB3639-83) is a cold-drawn or cold-rolled precision seamless pipe with high dimensional accuracy and good surface finish for mechanical structure and hydraulic equipment. The selection of precision seamless pipes to manufacture mechanical structures or hydraulic equipment, etc., can greatly save machining man-hours, improve material utilization, and help improve product quality.

Hot-rolled seamless pipes are divided into general steel pipes, low and medium pressure boiler steel pipes, high-pressure boiler steel pipes, alloy steel pipes, stainless steel pipes, petroleum cracking pipes, geological steel pipes and other steel pipes.