Special-shaped cold drawing forming process of collecting pipe

Abstract

The invention discloses a special-shaped cold drawing forming process of a collecting pipe, relates to the technical field of cold drawing forming, and aims to solve the problems that raw materials are not pretreated, tiny or hidden cracks cannot be perceived, and the thickness and the surface flatness of the stretched collecting pipe cannot be rapidly detected in the prior art. Through the linkage among the thickness gauge probe, the surface roughness detection probe I and the surface roughness detection probe II, the thickness and the surface flatness of the cold-drawn and formed collecting pipe are rapidly detected at the same time, defective products are rapidly removed, and then the ultrasonic crack detector is used for detecting tiny or hidden cracks, so that the detection accuracy is improved. Detailed information such as the depth, the length and the width of the crack is accurately evaluated, the production efficiency is improved, meanwhile, the product quality is improved, the market competitiveness is improved, the inner surface and the outer surface of the raw material are subjected to cleaning and descaling pretreatment procedures, generation of unqualified products is further reduced, resource waste is reduced, and the production cost is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of cold drawing, and in particular to a special-shaped cold drawing process for a collecting pipe. Background Art

[0002] Cold drawing is a metal material processing technology, which means applying tensile stress exceeding the yield point strength to the metal material at room temperature to cause it to undergo plastic deformation, thereby achieving the purpose of increasing material strength, improving material properties or making the material reach the desired shape and size. This process is widely used in the processing of steel, non-ferrous metals and other materials, especially in the manufacture of high-pressure vessels, pressure components and other structural parts.

[0003] Chinese patent document CN219505430U discloses a continuously operating cold drawing forming unit, comprising a workbench, a roller is installed at the upper end of the workbench, and a winding disk is movably connected at one end of the roller, a take-out plate is installed at one end of the winding disk, and a handle is installed at one end of the take-out plate, a threaded rod is installed at the upper end of the workbench, and a supporting wheel is installed at the upper end of the threaded rod, a hydraulic cylinder is installed inside the workbench, and a hydraulic rod is installed at the upper end of the hydraulic cylinder, a movable frame is embedded and installed at the upper end of the hydraulic rod, and a limiting wheel is installed inside the movable frame, a slide rail is provided at the upper end of the right side of the workbench, and a limiting plate is installed at the upper end of the slide rail, a slideway is provided at one end of the limiting plate, and a fixed rod is installed at one end of the slideway, and a slot is provided at the lower end of the fixed rod, preferably, the take-out plate and the winding disk are parallelly distributed, and the take-out plate and the handle are vertically distributed. The above-mentioned continuously operating cold drawing forming unit has shortcomings. Although the device realizes cold drawing forming, it has limitations. The unit does not pre-treat the raw materials, but directly performs cold drawing forming, which easily causes a large number of defective products and wastes resources. Secondly, it is impossible to quickly detect the thickness and surface flatness of the collecting pipe after stretching. Secondly, the unit only uses naked eye observation to inspect the finished products after cold drawing, but for tiny or hidden cracks, the visual inspection effect is limited, and it is difficult to accurately evaluate detailed information such as the depth, length and width of the cracks, which easily causes defective products to flow into the market, thereby affecting the company's reputation.

[0004] Therefore, in order to solve such problems, we proposed a special-shaped cold drawing process for the header. Summary of the invention

[0005] The purpose of the present invention is to provide a special-shaped cold-drawing forming process for a collecting pipe, aiming to solve the problem in the above-mentioned background technology that the existing continuously operating cold-drawing forming unit cannot detect tiny or hidden cracks during use because the raw materials are not pre-treated, and the thickness and surface flatness of the stretched collecting pipe cannot be quickly detected.

[0006] In order to achieve the above object, the present invention provides the following technical solution: a special-shaped cold-drawing forming process of a header, comprising the following implementation steps:

[0007] S1: Material selection and pretreatment to ensure that its chemical composition, mechanical properties and dimensional accuracy meet the design requirements;

[0008] S2: Mould design and manufacturing, strictly control the mould precision and quality to ensure its surface is smooth and damage-free;

[0009] S3: Cold drawing equipment and process parameter setting, set reasonable process parameters according to the characteristics of materials and molds;

[0010] S4: The cold drawing process requires strict control of the tension parameters, speed parameters and temperature parameters to ensure the accuracy and stability of the forming;

[0011] S5: Post-processing and inspection, detection of cross-section thickness and cracks of different sizes after cold drawing.

[0012] Furthermore, the material selection and pretreatment in S1 includes the following implementation steps:

[0013] S11: Select appropriate raw materials, such as metal bars or tubes, and ensure that their chemical composition, mechanical properties and dimensional accuracy meet the design requirements;

[0014] S12: Perform necessary pretreatment, cleaning and descaling of raw materials;

[0015] S13: Cut the raw material into appropriate lengths using a sawing machine or a cutting machine according to the required length;

[0016] S14: Perform edge processing on the cut material to remove burrs and sharp corners;

[0017] S15: Perform heating or preheating treatment to improve its plastic deformation ability.

[0018] Furthermore, in S12, both the inner and outer surfaces of the raw material need to be cleaned and pre-treated for descaling.

[0019] Furthermore, in S3, the implementation steps of the cold drawing forming equipment and process parameter setting are as follows;

[0020] S31: Select appropriate cold drawing equipment, cold drawing machine and stretching machine to ensure that the equipment can meet the requirements of the forming process;

[0021] S32: Determine the type, thickness and length structural characteristics of the material;

[0022] S33: Set corresponding process parameters, stretching force, speed and temperature.

[0023] Further, in S4, the cold drawing forming process is implemented as follows:

[0024] S41: placing the pretreated metal material into a cold drawing die and fixing the position;

[0025] S42: starting the cold drawing equipment to cause the metal material to undergo plastic deformation in the die by applying a tensile force, thereby gradually forming a predetermined shape of the manifold;

[0026] S43: During the molding process, it is necessary to pay close attention to the deformation of the material and adjust the tensile force and speed in time to ensure the accuracy and stability of molding;

[0027] S44: When the metal material reaches the desired length or shape, the stretching is stopped and the formed collector is removed from the die.

[0028] Furthermore, in S44, the preliminarily formed U-shaped header is shaped to make its shape and size more precise.

[0029] Further, in S5, the implementation steps of post-processing and inspection are as follows;

[0030] S51: Perform necessary post-processing on the formed manifold, including cleaning, degreasing and rust prevention, to improve the surface quality and corrosion resistance of the product;

[0031] S52: Perform manual quality inspection, including dimensional measurement, appearance inspection, and mechanical property testing;

[0032] S53: Use ultrasonic crack detector to inspect cracks to ensure that the shape, size and performance of the manifold meet the design requirements.

[0033] Furthermore, in S51, both the inner and outer surfaces of the raw material need to be cleaned, degreased, and post-treated to prevent rust.

[0034] Furthermore, the detection seat in S52 includes a placement seat, a slide rail is provided on the upper end of the detection seat, a mounting seat is provided on the upper end of the slide rail, a servo motor is provided inside the mounting seat, a connecting column is fixedly connected to the output end of the servo motor, a first gear is provided at the end of the connecting column away from the servo motor, an outer gear ring is provided on the side wall of the detection seat, the outer gear ring is meshingly connected to the first gear, a stepper motor is provided inside the mounting seat, a bidirectional threaded rod is provided at the output end of the stepper motor, two sliders are threadedly connected to the side wall of the bidirectional threaded rod, a first connecting rod is provided on the side wall of one slider, a surface roughness detection probe 1 is provided on the lower end of the first connecting rod, a second connecting rod is provided on the side wall of the other slider, a surface roughness detection probe 2 is provided on the upper end of the second connecting rod, a second gear is fixedly connected to the side wall of the bidirectional threaded rod, the second gear is meshingly connected to a rack, and a thickness gauge probe is provided on the end of the rack close to the placement seat.

[0035] Furthermore, the mounting seat is slidably connected via rollers and slide rails.

[0036] Compared with the prior art, the present invention has the following beneficial effects:

[0037] The present invention proposes a special-shaped cold-drawing forming process for a collecting pipe, which uses an ultrasonic crack detector to detect tiny or hidden cracks, accurately evaluates detailed information such as the depth, length and width of the cracks, improves production efficiency, increases product quality, and increases market competitiveness. Secondly, the inner and outer surfaces of the raw materials are cleaned and descaled before pretreatment, which further reduces the generation of defective products, reduces resource waste, and reduces production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a process flow chart of a special-shaped cold-drawing forming process of a header of the present invention;

[0039] Figure 2 A flow chart of material selection and pretreatment in a special-shaped cold-drawing forming process of a header according to the present invention;

[0040] Figure 3 It is a flow chart of cold drawing forming equipment and process parameter setting in a special-shaped cold drawing forming process of a header according to the present invention;

[0041] Figure 4 It is a flow chart of the cold drawing forming process in the special-shaped cold drawing forming process of a header of the present invention;

[0042] Figure 5 It is a flow chart of post-processing and inspection in a special-shaped cold-drawing forming process of a header of the present invention;

[0043] Figure 6 This is a cold-drawing experimental data table of different thickness headers in a special-shaped cold-drawing process of a header of the present invention;

[0044] Figure 7 A three-dimensional schematic diagram of a detection device in a special-shaped cold-drawing forming process of a header according to the present invention Figure 1 ;

[0045] Figure 8 A three-dimensional schematic diagram of a detection device in a special-shaped cold-drawing forming process of a header according to the present invention Figure 2 ;

[0046] Fig. 9 It is a three-dimensional exploded schematic diagram of the interior of a detection device in a special-shaped cold-drawing forming process of a collecting pipe of the present invention.

[0047] In the figure: 1. detection seat; 11. placement seat; 12. slide rail; 2. mounting seat; 21. servo motor; 22. connecting column; 23. first gear; 24. outer gear ring; 25. stepping motor; 26. bidirectional threaded rod; 27. slider; 28. first connecting rod; 281. second connecting rod; 29. ​​second gear; 291. rack; 3. thickness gauge probe; 31. surface roughness detection probe 1; 32. surface roughness detection probe 2. DETAILED DESCRIPTION

[0048] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0049] In order to solve the problem that the existing continuous cold drawing forming unit cannot detect small or hidden cracks due to the lack of pretreatment of raw materials during use, and cannot quickly detect the thickness and surface flatness of the stretched header, please refer to Figure 1-Figure 9 , provide the following preferred technical solutions, including the following implementations;

[0050] Step 1: Material selection and pretreatment to ensure that its chemical composition, mechanical properties and dimensional accuracy meet the design requirements;

[0051] Step 2: Mold design and manufacturing. The design and manufacturing accuracy of the mold have an important influence on the selection of cold drawing forming process parameters. Reasonable mold structure, precise size and good surface quality help to reduce the difficulty of forming and improve product quality. Therefore, the accuracy and quality should be strictly controlled during mold design and manufacturing. The mold should have precise size and reasonable structure to ensure the accuracy and stability of forming. The mold should be inspected and maintained as necessary during use to ensure that its surface is smooth and undamaged, and an appropriate amount of lubricant should be applied to reduce the friction between the metal and the mold. Secondly, the mold temperature has a significant effect on the fluidity and forming quality of the material. Appropriate mold temperature can reduce the deformation resistance of the material and improve the forming accuracy. Excessive mold temperature may cause excessive softening of the material, causing uneven deformation or surface defects; while too low mold temperature may increase the difficulty of deformation of the material and reduce the forming efficiency. Therefore, the mold temperature is adjusted according to the thermal conductivity, deformation temperature range and forming speed of the material.

[0052] Step 3: Cold drawing forming equipment and process parameter setting, set reasonable process parameters according to the characteristics of materials and molds;

[0053] Step 4: During the cold drawing process, the tension parameters, speed parameters and temperature parameters need to be strictly controlled to ensure the accuracy and stability of the forming;

[0054] Step 5: Post-processing and inspection, detection of cross-section thickness and cracks of different sizes after cold drawing.

[0055] Step 11: Select the appropriate raw materials, which are metal bars or tubes, and ensure that their chemical composition, mechanical properties and dimensional accuracy meet the design requirements;

[0056] Step 12: Perform necessary pretreatment, cleaning and descaling of raw materials to avoid adverse effects on product performance, appearance, service life and production safety due to lack of pretreatment;

[0057] Step 13: According to the required length, use a sawing machine or a cutting machine to cut the raw material into appropriate lengths. The cut surface of the raw material should be treated to avoid adhesion of cutting debris affecting subsequent cold drawing;

[0058] Step 14: Process the edges of the cut materials to remove burrs and sharp corners to prevent the burrs from directly scratching the workers' skin;

[0059] Step 15: Perform heating or preheating treatment to improve its plastic deformation ability.

[0060] In step 12, both the inner and outer surfaces of the raw material need to be cleaned and pre-treated for descaling.

[0061] For step 3, the implementation steps of cold drawing forming equipment and process parameter setting are as follows;

[0062] Step 31: Select appropriate cold drawing equipment to ensure that the equipment can meet the requirements of the forming process;

[0063] Step 32: Determine the type, thickness and length structural characteristics of the material;

[0064] Step 33: Set the corresponding process parameters, stretching force, speed and temperature.

[0065] In step 4, the implementation steps of the cold drawing process are as follows;

[0066] Step 41: Place the pretreated metal material into the cold drawing die and fix the position;

[0067] Step 42: starting the cold drawing equipment to apply a tensile force to cause the metal material to undergo plastic deformation in the die, thereby gradually forming a predetermined shape of the manifold;

[0068] Step 43: During the molding process, it is necessary to pay close attention to the deformation of the material and adjust the stretching force and speed in time to ensure the accuracy and stability of the molding;

[0069] Step 44: When the metal material reaches the desired length or shape, the stretching is stopped and the formed header is removed from the die.

[0070] In step 44, the initially formed U-shaped header is shaped to make its shape and size more precise.

[0071] For step 5, the implementation steps of post-processing and inspection are as follows;

[0072] Step 51: Perform necessary post-processing on the formed manifold, including cleaning, degreasing and rust prevention, so as to improve the surface quality and corrosion resistance of the product;

[0073] Step 52: Perform manual quality inspection, including dimensional measurement, appearance inspection, and mechanical property testing;

[0074] Step 53: Use an ultrasonic crack detector to inspect cracks to ensure that the shape, size and performance of the header meet the design requirements.

[0075] In step 51, both the inner and outer surfaces of the raw material need to be cleaned, degreased, and post-treated to prevent rust.

[0076] A special-shaped cold-drawing forming process for a manifold, wherein the detection seat 1 in S52 comprises a placement seat 11, a slide rail 12 is arranged at the upper end of the detection seat 1, a mounting seat 2 is arranged at the upper end of the slide rail 12, a servo motor 21 is arranged inside the mounting seat 2, a connecting column 22 is fixedly connected to the output end of the servo motor 21, a first gear 23 is arranged at the end of the connecting column 22 away from the servo motor 21, an outer gear ring 24 is arranged on the side wall of the detection seat 1, the outer gear ring 24 is meshedly connected with the first gear 23, a stepping motor 25 is arranged inside the mounting seat 2, and the stepping motor 2 The output end is provided with a bidirectional threaded rod 26, and the side wall of the bidirectional threaded rod 26 is threadedly connected with two sliders 27, the side wall of one slider 27 is provided with a first connecting rod 28, and the lower end of the first connecting rod 28 is provided with a surface roughness detection probe 1 31, and the side wall of the other slider 27 is provided with a second connecting rod 281, and the upper end of the second connecting rod 281 is provided with a surface roughness detection probe 2 32, and the side wall of the bidirectional threaded rod 26 is fixedly connected with a second gear 29, and the second gear 29 is meshedly connected with a rack 291, and the rack 291 is close to the placement seat 11 A thickness gauge probe 3 is provided at one end, which is used to drive the connecting column 22 to rotate through the servo motor 21, so that the connecting column 22 drives the first gear 23 to rotate, so that the first gear 23 rotates around the outer gear ring 24, so that the mounting seat 2 slides around the slide rail 12 using the roller, so that the mounting seat 2 drives the thickness gauge probe 3, the surface roughness detection probe 1 31 and the surface roughness detection probe 2 32 to move around the outer surface of the U-shaped collector, and then the thickness gauge probe 3, the surface roughness detection probe 1 31 and the surface roughness detection probe 2 32 are used to detect whether the surface flatness and the stretched thickness of the collector after cold drawing are uniform, so as to realize the linkage between the thickness gauge probe 3, the surface roughness detection probe 1 31 and the surface roughness detection probe 2 32, and then use them to quickly detect the thickness and surface flatness of the collector after cold drawing, and quickly remove defective products. Secondly, an ultrasonic crack detector is used to detect small or hidden cracks, and the depth, length and width detailed information of the cracks are accurately evaluated, so as to improve production efficiency, increase product quality and increase market competitiveness.

[0077] The mounting seat 2 is slidably connected to the slide rail 12 via rollers, and is used for the mounting seat 2 to slide on the upper surface of the slide rail 12, thereby driving the thickness gauge probe 3, the surface roughness detection probe 1 31 and the surface roughness detection probe 2 32 to detect the cold-drawn collecting pipe.

[0078] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0079] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A special-shaped cold-drawing forming process for a header, characterized in that: The implementation steps include: S1: Material selection and pretreatment to ensure that its chemical composition, mechanical properties and dimensional accuracy meet the design requirements; S2: Mould design and manufacturing, strictly control the mould precision and quality to ensure its surface is smooth and damage-free; S3: Cold drawing equipment and process parameter setting, set reasonable process parameters according to the characteristics of materials and molds; S4: The cold drawing process requires strict control of the tension parameters, speed parameters and temperature parameters to ensure the accuracy and stability of the forming; S5: Post-processing and inspection, detection of cross-section thickness and cracks of different sizes after cold drawing.

2. The special-shaped cold-drawing forming process of a header according to claim 1, characterized in that: The material selection and pretreatment in S1 includes the following implementation steps: S11: Select appropriate raw materials, metal bars or tubes; S12: Perform necessary pretreatment, cleaning and descaling of raw materials; S13: Cut the raw material into appropriate lengths using a sawing machine or a cutting machine according to the required length; S14: Perform edge processing on the cut material to remove burrs and sharp corners; S15: Perform heating or preheating treatment to improve its plastic deformation ability.

3. The process for forming a special-shaped header by cold drawing according to claim 2, characterized in that: In the S12, both the inner and outer surfaces of the raw material need to be cleaned and pre-treated for descaling.

4. The process for forming a special-shaped header by cold drawing according to claim 1, characterized in that: In S3, the implementation steps of cold drawing forming equipment and process parameter setting are as follows; S31: Select appropriate cold drawing equipment to ensure that the equipment can meet the requirements of the forming process; S32: Determine the type, thickness and length structural characteristics of the material; S33: Setting corresponding stretching force parameters, speed parameters and temperature parameters.

5. The special-shaped cold-drawing forming process of a header according to claim 1, characterized in that: In S4, the cold drawing forming process is implemented as follows: S41: placing the pretreated metal material into a cold drawing die and fixing the position; S42: starting the cold drawing equipment to cause the metal material to undergo plastic deformation in the die by applying a tensile force, thereby gradually forming a predetermined shape of the manifold; S43: During the molding process, it is necessary to pay close attention to the deformation of the material and adjust the tensile force and speed in time to ensure the accuracy and stability of molding; S44: When the metal material reaches the desired length or shape, the stretching is stopped and the formed collector is removed from the die.

6. The process for forming a special-shaped header by cold drawing according to claim 5, characterized in that: In the S44, the initially formed U-shaped header is shaped to make its shape and size more precise.

7. The special-shaped cold-drawing forming process of a header according to claim 1, characterized in that: Regarding S5, the implementation steps of post-processing and inspection are as follows. S51: Perform necessary post-processing on the formed manifold, including cleaning, degreasing and rust prevention, to improve the surface quality and corrosion resistance of the product; S52: Perform manual quality inspection, including dimensional measurement, appearance inspection, and mechanical property testing; S53: Use ultrasonic crack detector to inspect cracks to ensure that the shape, size and performance of the manifold meet the design requirements.

8. The process for forming a special-shaped header by cold drawing according to claim 7, characterized in that: In S51, both the inner and outer surfaces of the raw material need to be cleaned, degreased and post-treated to prevent rust.

9. The process for forming a special-shaped header by cold drawing according to claim 7, characterized in that: The detection seat (1) in S52 comprises a placement seat (11), a slide rail (12) is arranged at the upper end of the detection seat (1), a mounting seat (2) is arranged at the upper end of the slide rail (12), a servo motor (21) is arranged inside the mounting seat (2), a connecting column (22) is fixedly connected to the output end of the servo motor (21), a first gear (23) is arranged at the end of the connecting column (22) away from the servo motor (21), an outer gear ring (24) is arranged on the side wall of the detection seat (1), the outer gear ring (24) and the first gear (23) are meshingly connected, a stepping motor (25) is arranged inside the mounting seat (2), and a bidirectional threaded rod is arranged at the output end of the stepping motor (25). (26), the side wall of the bidirectional threaded rod (26) is threadedly connected to two sliders (27), the side wall of one slider (27) is provided with a first connecting rod (28), the lower end of the first connecting rod (28) is provided with a surface roughness detection probe 1 (31), the side wall of the other slider (27) is provided with a second connecting rod (281), the upper end of the second connecting rod (281) is provided with a surface roughness detection probe 2 (32), the side wall of the bidirectional threaded rod (26) is fixedly connected to a second gear (29), the second gear (29) is meshingly connected to a rack (291), and a thickness gauge probe (3) is provided at one end of the rack (291) close to the placement seat (11).

10. The process for forming a special-shaped header by cold drawing according to claim 9, characterized in that: The mounting seat (2) is slidably connected via rollers and a slide rail (12).

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