CN115870704A - A kind of internal expansion cold processing technology of equal-diameter tee - Google Patents

Abstract

The invention discloses an internal expansion cold processing technology of equal-diameter tees of pipe fittings, which belongs to the technical field of metal processing technology. Step 1: blanking, calculating the blanking specifications of the pipe blank according to the forming size of the tee pipe fittings to be produced, and then For the selection of the tube embryo, the surface of the tube embryo must be cleaned in advance and kept dry before the mold is selected. After the tube embryo is fixed in the three-way water expansion molding machine, the mold must be fixed in advance. Clean up the surrounding environment to maintain the overall cleanliness; this application uses a water swelling molding machine to provide sufficient pressure, and the liquid uses white emulsified water that is easy to flow and dissipate heat quickly, which is beneficial to improve the transmission efficiency of the medium. Cutting equipment is used for cutting products or tube embryos, which is beneficial to improve the efficiency of cutting, improve the quality of cutting, further improve the accuracy of cutting, and further improve the aesthetics of equipment use.

Description

A kind of internal expansion cold processing technology of equal-diameter tee

technical field

The invention belongs to the technical field of metal processing, and in particular relates to an internal expansion cold processing technology for equal-diameter tees of pipe fittings.

Background technique

The production process of the three-way pipe is generally divided into two types, one is the internal expansion cold processing process, also called the hydraulic expansion process, and the other is the hot pressing forming process, in which the forming material suitable for the hydraulic expansion process has a tendency of cold hardening Relatively low carbon steel, low alloy steel, stainless steel, including some non-ferrous metal materials, such as copper, aluminum, titanium, etc., which makes it widely used.

In the existing internal expansion cold processing technology of equal-diameter tees, in order to reduce production costs, hydraulic expansion machines are generally used in the expansion process, and the process flow is reduced at the same time. However, in the actual use process, this process flow The reduction and unreasonable use of equipment often lead to insufficient pressure in the forming process of the product, resulting in abnormal dents in the tee, which leads to a relatively low yield rate and relatively high production costs. At the same time There are often cracks on the surface of the product. In order to avoid this situation, it is necessary to design an internal expansion cold processing process for pipe fittings with equal diameters.

Contents of the invention

Aiming at the deficiencies of the prior art, the present invention provides an internal expansion cold processing process for equal-diameter tees, which has the advantage of a relatively high yield rate. This application uses a water expansion molding machine to provide sufficient pressure, and the liquid is easy to use. White emulsified water with fluidity and fast heat dissipation is conducive to improving the transmission efficiency of the medium. Using laser cutting equipment to cut products or tube embryos is beneficial to improve cutting efficiency, improve cutting quality, and further improve cutting accuracy. , which is conducive to further improving the aesthetics of the equipment.

In order to achieve the above object, the present invention provides the following technical solution: a kind of internal expansion cold processing process of equal-diameter tee, the steps are as follows:

Step 1: blanking, calculate the blanking specification of the tube blank according to the forming size of the tee pipe fittings to be produced, and select the tube blank. When selecting the mold, the surface of the tube blank must be cleaned in advance and kept Its surface is dry. After fixing the tube embryo in the three-way water expansion molding machine and fixing the mold, the surrounding environment must be cleaned in advance to maintain the overall cleanliness.

Step 2: Expansion type, using a three-way water-expansion molding machine. Before using the three-way water-expansion molding machine, the switch of the cooling water of the cooler must be turned on, and then move forward through the two horizontal plungers of the three-way water-expansion molding machine , press the liquid into the mold, and then continue to advance synchronously through the two side cylinders of the three-way water expansion molding machine, and squeeze the tube blank. The supercharger inputs ultra-high pressure liquid into the mold, and the volume of the tube blank becomes smaller after extrusion , the pressure of the liquid in the tube blank increases as the volume of the tube blank decreases. When the pressure required for the expansion of the tee branch is reached, the tube blank flows along the inner cavity of the mold under the dual action of the side cylinder and the ultra-high pressure liquid in the mold. Expand the branch pipe.

Step 3: Cutting. Cutting the preliminarily formed product at equal distances to ensure that the product is a three-way tee. It is also necessary to remove some abnormal raised parts on the surface. At the same time, quality inspection is required to check the surface for cracks and abnormalities. Depressed products are rejected to avoid affecting the overall batch quality,

Step 4: Cleaning, put the formed product into the ultrasonic cleaning tank for cleaning, the ultrasonic frequency must be controlled between 20-30KHZ, and the cleaning temperature should be 50-70 ° C, and then use a soft brush to clean it. Its surface and interior are cleaned to avoid the occurrence of stains and sticking, and then it is dried.

Step 5: Grinding, first add polishing powder, reset the control clamping component, and then control the clamping component to fix the product. It is necessary to ensure that the surface of the clamp is smooth and air-tight, so as to avoid scratching the tee pipe by the clamp When the situation arises, when the grinding and polishing machine is used for grinding and polishing, some relatively sharp corners of the product need to be processed at the same time. It is necessary to ensure the smoothness of the corners of the product. After the grinding and polishing is completed, the product needs to be cleaned twice , and apply anti-corrosion paint to the surface of the product.

Preferably, if there is no suitable type of material for material selection in the blanking process, a laser cutting knife is required to cut the tube embryo.

Preferably, when the pressure of the three-way water-expanding molding machine used in the expansion type is overpressured during the molding process, the hydraulic machine will automatically release the pressure within a certain period of time, and the pressure relief time of the three-way water-expansion molding machine in the expansion type is consistent with the product molding time , The liquid used in the three-way water swelling molding machine is white emulsified water with easy flow and fast heat dissipation.

Preferably, the cutting of the product adopts a laser cutting knife to ensure the accuracy of cutting.

Preferably, the grinding can also be processed by a shot blasting machine. The shot blasting machine used in the grinding needs to reduce the diameter of the steel shot and use a steel shot with a diameter of 0.2-0.5 cm.

Preferably, sampling inspection is required after the grinding is completed, and the detection content of the sampling inspection after the grinding is generally a pull-out test, a flattening test, an air pressure test, a pressure test, tensile strength, and corrosion resistance. The pull-out test requires The pulling force of the socket argon arc welding pipe fittings of the product is 3 times that of the national standard. The flattening test needs to flatten the pipe fittings to 1/3 of the outer diameter without cracks or cracks. The air pressure test needs to ensure that the pipe fittings can pass through normally. 1.6Mpa air pressure test without damage. The pressure test requires no leakage at the joint after the pipe and fitting are connected at 2.5Mpa and pressure for 5 minutes. The tensile strength needs to be not less than 520Mpa to ensure that the elongation of the product pipe fitting is not less than 35. %, corrosion resistance needs to ensure that the weld of the product has no corrosion after the salt spray test.

Compared with the prior art, the beneficial effects of the present invention are as follows:

In this application, the water-swelling molding machine is used to provide sufficient pressure and improve the plasticity of the metal to a certain extent. The liquid adopts white emulsified water with easy flow and heat dissipation, which is good for improving the transmission efficiency of the medium. At the same time, the water-swelling molding machine is During the forming process, if the pressure is overpressure, the hydraulic machine will automatically release the pressure within a certain period of time, which can play a certain protective role, avoiding the situation where the pressure is too large and only one damage will occur, which will help better protect the equipment to a certain extent. At the same time, laser cutting equipment is used to cut products or tube embryos, which will help improve cutting efficiency, improve cutting quality, further improve cutting accuracy, improve cutting flexibility, and improve cutting adaptability , reduce the occurrence of burrs on the edge of the product, and at the same time help to improve the smoothness of the cutting edge, and then use ultrasonic equipment as cleaning equipment to improve the cleaning effect and quality of cleaning. Use a soft brush to perform simple cleaning after ultrasonic cleaning Cleaning will help to further improve the cleanliness of the product, reduce the probability of stains, dust and other dirt sticking together, and improve the aesthetics of the equipment. The high requirements for the fixture will help reduce the occurrence of accidents in the production process of the equipment, and will help further. Improve the aesthetics of equipment use.

Description of drawings

Fig. 1 is a production flow chart of the present invention.

Detailed ways

Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

The present invention provides a technical solution: an internal expansion cold processing process for equal-diameter tees of pipe fittings, the steps of which are as follows:

Step 1: blanking, calculate the blanking specification of the tube blank according to the forming size of the tee pipe fittings to be produced, and select the tube blank. When selecting the mold, the surface of the tube blank must be cleaned in advance and kept Its surface is dry. After fixing the tube embryo in the three-way water expansion molding machine and fixing the mold, the surrounding environment must be cleaned in advance to maintain the overall cleanliness.

Step 2: Expansion type, using a three-way water-expansion molding machine. Before using the three-way water-expansion molding machine, the switch of the cooling water of the cooler must be turned on, and then move forward through the two horizontal plungers of the three-way water-expansion molding machine , press the liquid into the mold, and then continue to advance synchronously through the two side cylinders of the three-way water expansion molding machine, and squeeze the tube blank. The supercharger inputs ultra-high pressure liquid into the mold, and the volume of the tube blank becomes smaller after extrusion , the pressure of the liquid in the tube blank increases as the volume of the tube blank decreases. When the pressure required for the expansion of the tee branch is reached, the tube blank flows along the inner cavity of the mold under the dual action of the side cylinder and the ultra-high pressure liquid in the mold. Expand the branch pipe.

Step 3: Cutting. Cutting the preliminarily formed product at equal distances to ensure that the product is a three-way tee. It is also necessary to remove some abnormal raised parts on the surface. At the same time, quality inspection is required to check the surface for cracks and abnormalities. Depressed products are rejected to avoid affecting the overall batch quality,

Step 4: Cleaning, put the formed product into the ultrasonic cleaning tank for cleaning, the ultrasonic frequency must be controlled between 20-30KHZ, and the cleaning temperature should be 50-70 ° C, and then use a soft brush to clean it. Its surface and interior are cleaned to avoid the occurrence of stains and sticking, and then it is dried.

Step 5: Grinding, first add polishing powder, reset the control clamping component, and then control the clamping component to fix the product. It is necessary to ensure that the surface of the clamp is smooth and air-tight, so as to avoid scratching the tee pipe by the clamp When the situation arises, when the grinding and polishing machine is used for grinding and polishing, some relatively sharp corners of the product need to be processed at the same time. It is necessary to ensure the smoothness of the corners of the product. After the grinding and polishing is completed, the product needs to be cleaned twice , and apply anti-corrosion paint to the surface of the product.

The invention provides a technical solution: an internal expansion cold processing process for pipe fittings with equal diameters, wherein, if there is no suitable type of material in the material selection process during the blanking process, a laser cutting knife must be used to cut the pipe embryo; a pipe fitting The internal expansion cold processing technology of the equal-diameter tee, in which, the pressure of the three-way water-inflatable molding machine used in the expansion type is overpressured during the forming process, and the hydraulic machine will automatically release the pressure within a certain period of time. The pressure relief time is consistent with the product molding time. The liquid used in the three-way water expansion molding machine is white emulsified water that is easy to flow and dissipate heat quickly, which is conducive to improving the plasticity of the metal to a certain extent. The liquid is easy to flow and dissipate heat quickly. White emulsified water is beneficial to improve the transmission efficiency of the medium. At the same time, when the water expansion molding machine is overpressured during the molding process, the hydraulic machine will automatically release the pressure within a certain period of time, which can play a certain protective role and prevent the pressure from being too large. In the case of damage, it is beneficial to better protect the equipment to a certain extent.

The invention provides a technical solution: an internal expansion cold processing process for equal-diameter tees, wherein the cutting of the product adopts a laser cutting knife to ensure the accuracy of cutting; the grinding can also be processed by a shot blasting machine, and the grinding The shot blasting machine used needs to reduce the diameter of the steel shot. The steel shot with a diameter of 0.2-0.5cm is used, and the laser cutting equipment is used to cut the product or tube embryo, which is beneficial to improve the cutting efficiency and cutting quality, and further Improve the accuracy of cutting, improve the flexibility of cutting, improve the adaptability of cutting, reduce the occurrence of burrs on the edge of the product, and help improve the smoothness of the cutting edge. At the same time, the use of shot blasting machines can also be used as a The backup option for those who use shot blasting machines as polishing and grinding equipment is beneficial to improve the product’s resistance to pressure, but the overall smoothness will be relatively low compared with grinding equipment. At the same time, laser cutting equipment is used for The cutting of products or tube embryos is beneficial to improve the efficiency of cutting, improve the quality of cutting, further improve the accuracy of cutting, improve the flexibility of cutting, improve the degree of adaptation of cutting, and reduce the occurrence of burrs on the edge of products. At the same time, it is beneficial to improve the smoothness of the cutting edge. By using ultrasonic equipment as cleaning equipment, it is beneficial to improve the cleaning effect and quality of cleaning. Using a soft brush for simple cleaning after ultrasonic cleaning is conducive to further improving the cleanliness of the product. , reduce the probability of dirt adhesion such as stains and dust, and improve the aesthetics of the equipment.

The invention provides a technical solution: an internal expansion cold processing process for equal diameter tees of pipe fittings, in which sampling inspection is required after the grinding is completed, and the detection content of the sampling inspection after grinding is generally a drawing test and a flattening test , air pressure test, pressure test, tensile strength, corrosion resistance, the pull-out test requires that the pull-out force of the socket argon arc welding pipe fittings of the product is 3 times that of the national standard, and the flattening test needs to flatten the pipe to the outer diameter The air pressure test needs to ensure that the pipe fittings can pass the 1.6Mpa air pressure test without damage. The pressure test requires that the pipe and pipe fittings are connected and there is no leakage at the joint under the condition of 2.5Mpa and holding pressure for 5 minutes. , the tensile strength needs to be not less than 520Mpa to ensure that the elongation of the product pipe fittings is not less than 35%, and the corrosion resistance needs to ensure that the weld seam of the product has no rust after the salt spray test. Through the detection of high requirements for the product, it is beneficial to improve The quality of the product improves the user experience when using it, which is conducive to raising the threshold of finished product quality in a disguised form.

It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is a relationship between these entities or operations. There is no such actual relationship or order between them. Furthermore, the term "comprises", "comprises" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article, or apparatus comprising a set of elements includes not only those elements, but also includes elements not expressly listed. other elements of or also include elements inherent in such a process, method, article, or device.

Although the embodiments of the present invention have been shown and described, those skilled in the art can understand that various changes, modifications and substitutions can be made to these embodiments without departing from the principle and spirit of the present invention. and modifications, the scope of the invention is defined by the appended claims and their equivalents.

Claims (6)

1. An internal expansion cold working process of a pipe fitting constant diameter tee joint is characterized by comprising the following steps:

the method comprises the following steps: blanking, namely calculating the blanking specification of a pipe blank according to the forming size of a three-way pipe fitting to be produced to select the pipe blank, wherein the surface of the pipe blank needs to be cleaned in advance and kept dry when a mould is selected, and the periphery of the pipe blank needs to be cleaned in advance when the mould is fixed in a three-way water expansion forming machine to keep the integral cleaning degree when the mould is fixed;

step two: expanding, namely adopting a three-way water-swelling forming machine, opening a switch of cooling water of a cooler before the three-way water-swelling forming machine is used, moving forwards through two horizontal plungers of the three-way water-swelling forming machine to punch liquid into a die, continuously and synchronously moving forwards through two side cylinders of the three-way water-swelling forming machine, extruding a pipe blank, inputting ultrahigh-pressure liquid into the die by a supercharger, reducing the volume of the pipe blank after extrusion, increasing the pressure of the liquid in the pipe blank along with the reduction of the volume of the pipe blank, and expanding the branch pipe by flowing along an inner cavity of the die under the double action of the ultrahigh-pressure liquid in the side cylinders and the die when the required pressure for expanding the three-way branch pipe is reached;

step three: cutting, namely, performing equidistant cutting on the preliminarily formed product to ensure that the product is an equal-diameter tee joint, cutting off parts with abnormal bulges on the surface, simultaneously, detecting the quality, removing the product with cracks and abnormal depressions on the surface to avoid influencing the quality of the whole batch,

step four: cleaning, namely putting the formed product into an ultrasonic cleaning pool for cleaning, controlling the ultrasonic frequency to be 20-30KHZ, simultaneously cleaning the surface and the interior of the product by adopting a soft brush at a working temperature of 50-70 ℃ to avoid the occurrence of stain adhesion, and drying the product;

step five: the polishing machine comprises a clamping assembly, a polishing mechanism, a clamp, a grinding and polishing machine and a control clamp, wherein the clamping assembly is used for clamping a product, the clamping assembly is used for clamping the product, the surface of the clamp is required to be smooth, air leakage is avoided, the clamp is prevented from scratching a three-way pipe, the grinding and polishing machine is used for grinding and polishing the three-way pipe, the corners of the product which are relatively sharp are required to be treated, the smoothness of the corners of the product is required to be ensured, after the grinding and polishing are finished, the product is required to be subjected to secondary cleaning treatment, and the surface of the product is coated with anticorrosive paint.

2. The internal expansion cold working process of the pipe fitting constant diameter tee joint as claimed in claim 1, wherein: if materials with proper types do not exist in the blanking process, a laser cutting knife needs to be adopted to cut the pipe blank.

3. The internal expansion cold working process of the pipe fitting constant diameter tee joint as claimed in claim 1, wherein the internal expansion cold working process comprises the following steps: the three-way water expansion forming machine adopted in the expansion type can automatically release pressure within a certain time when the pressure is over-pressure in the forming process, the pressure release time of the three-way water expansion forming machine in the expansion type is consistent with the product forming time, and the liquid adopted by the three-way water expansion forming machine is white emulsified water which is easy to flow and fast in heat dissipation.

4. The internal expansion cold working process of the pipe fitting constant diameter tee joint as claimed in claim 1, wherein: the cutting of product adopts laser cutting knife in order to guarantee the accurate degree of cutting.

5. The internal expansion cold working process of the pipe fitting constant diameter tee joint as claimed in claim 1, wherein: the grinding can also be carried out by adopting a shot blasting machine, and the shot blasting machine adopted by the grinding needs to reduce the diameter of the steel shot and adopts the steel shot with the diameter kept between 0.2 and 0.5 cm.

6. The internal expansion cold working process of the pipe fitting constant diameter tee joint as claimed in claim 1, wherein: the method is characterized in that sampling detection is needed after polishing is completed, the detection content of the sampling detection after polishing generally comprises a drawing test, a flattening test, an air pressure test, a pressure resistance test, tensile strength and corrosion resistance, the drawing test needs that the socket argon arc welding pipe fitting of a product is connected with the drawing force which is 3 times of the national standard, the flattening test needs that the pipe fitting is flattened to 1/3 of the outer diameter without cracks or splits, the air pressure test needs to ensure that the pipe fitting can normally pass the 1.6Mpa air pressure test without damage, the pressure resistance test needs that the joint of the pipe fitting and the pipe fitting is not leaked under the conditions of 2.5Mpa and 5min of pressure maintaining, the tensile strength needs to carry out not less than 520Mpa tensile force on the pipe fitting of the product to ensure that the elongation is not less than 35%, and the corrosion resistance needs to ensure that the welding line of the product is not rusted after the salt spray test.

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