Radial extrusion connecting pipe fitting for hydraulic pipe and manufacturing method of radial extrusion connecting pipe fitting

Abstract

The invention discloses a hydraulic pipe radial extrusion connecting pipe fitting and a manufacturing method thereof. The hydraulic pipe radial extrusion connecting pipe fitting comprises a pipe sleeve and a sealing ring. The pipe sleeve is of a bilateral symmetry structure, an annular sealing groove is formed in the inner wall of the pipe sleeve, the outer surfaces of the left end and the right end of the pipe sleeve are conical surfaces, the outer surface of the middle of the pipe sleeve is a cylindrical surface, and an annular groove is formed between the conical surfaces of the left end and the right end of the pipe sleeve and the cylindrical surface of the middle. A plurality of tangent planes are formed on the conical surfaces at the left end and the right end and the transition surfaces of the conical surfaces and the annular grooves through a material removing method, and the tangent planes are planes which are uniformly distributed in the circumferential direction of the pipe sleeve and are parallel to the axial central axis of the pipe sleeve; the sealing ring is embedded in the annular sealing groove in the inner wall of the pipe sleeve. Rapid connection of the airplane hydraulic system pipeline is achieved, and the purposes of reducing the number of hydraulic pipeline connector parts, improving the assembling work efficiency and meeting the requirements for light weight and reliability of an airplane are achieved.

Description

Technical Field

[0001] The invention relates to the field of hydraulic technology, in particular to a radial extrusion type connecting pipe fitting suitable for aircraft hydraulic system pipelines and a manufacturing method thereof. Background Art

[0002] At present, the pipeline connection structure of the aircraft hydraulic system mainly includes flared joints, internal extrusion non-flared joints, internal rolled non-flared joints, axial extrusion joints and the like. Since the above-mentioned joints have a large number of parts (the flared and non-flared joint structures are generally composed of 5 parts, and the axial extrusion joint structure is generally composed of 3 parts), low reliability, high weight, and need to be pre-installed before assembly on the aircraft, not only are the operating steps cumbersome and the work efficiency low, but also cannot meet the requirements of aircraft lightweight and reliability. Summary of the invention

[0003] The present invention provides a hydraulic pipeline directional extrusion connection pipe fitting and a manufacturing method thereof, aiming to realize the rapid connection of aircraft hydraulic system pipelines through the cooperation of a pipe sleeve and a sealing ring structure, so as to reduce the number of hydraulic pipeline joint parts, improve assembly work efficiency, and meet the requirements of aircraft lightweight and reliability.

[0004] In order to achieve the above object, the present invention adopts the following technical scheme: A hydraulic pipe axial extrusion connection pipe fitting comprises a pipe sleeve and a sealing ring; the pipe sleeve is a bilaterally symmetrical structure, an annular sealing groove is arranged on its inner wall, the outer surfaces of the left and right ends of the pipe sleeve are conical surfaces, the outer surface of the middle part of the pipe sleeve is a cylindrical surface, an annular groove is arranged between the conical surfaces at the left and right ends of the pipe sleeve and the cylindrical surface at the middle part, a plurality of cut surfaces are formed by removing material on the conical surfaces at the left and right ends and on the transition surfaces between the conical surfaces and the annular groove, the cut surfaces are planes uniformly arranged along the circumference of the pipe sleeve and parallel to the axial center axis thereof; the sealing ring is embedded in the annular sealing groove on the inner wall of the pipe sleeve.

[0005] The hydraulic pipe is axially extruded to connect the pipe fittings, and the cross-sections of the pipe sleeve are evenly arranged in six groups along the circumferential direction, forming a triangular contour line at the junction of the cross-section and the outer surface of the pipe sleeve.

[0006] The hydraulic pipeline is axially extruded to connect the pipe fittings, the number of annular sealing grooves on the inner wall of the sleeve is at least four, at least two groups are arranged on the left and right sides of the inner wall of the sleeve; the number of sealing rings is at least two, at least one group is arranged in the annular sealing grooves on the left and right sides.

[0007] The hydraulic pipe is axially extruded to connect the pipe fittings, the inner diameter of the sealing ring is larger than the outer diameter of the matching conduit, and the hardness of the sealing ring is 54A-60A.

[0008] The hydraulic pipe is a directional extruded connecting pipe fitting, and a corrosion-resistant coating is applied on the outer surface of the pipe sleeve and the inner surfaces at the two ends.

[0009] A method for manufacturing a hydraulic pipe axial extrusion connection pipe fitting includes a pipe sleeve machining process and a sealing ring curing process in an annular sealing groove. The specific operation steps are as follows: a. Cutting: Select metal bars of appropriate specifications and materials as raw materials and cut them to set lengths; b. Rough machining: the outer surface of the sleeve is rough machined by lathe equipment, and then the inner hole of the sleeve is roughly bored by boring machine equipment; c. Finishing: Use lathe equipment to finish the outer surface of the sleeve, and then use boring machine equipment to finish boring the inner hole of the sleeve; d. Curing of the sealing ring: injecting the sealing ring compound raw material into the annular sealing groove of the pipe sleeve through a special tool and heating and curing it to form a sealing ring; e. Processing the cut surface: the cut surfaces are processed one by one along the circumference of the sleeve by a milling machine; f. Apply corrosion-resistant coating and apply polytetrafluoroethylene coating on the outer surface of the sleeve and the inner surface of the two ends.

[0010] In the above method for manufacturing the hydraulic pipeline directional extrusion connection pipe fitting, in step a, the raw material of the pipe sleeve can be selected from aluminum alloy, stainless steel or titanium alloy bars according to the material of the conduit in the hydraulic pipeline.

[0011] In the above-mentioned method for manufacturing hydraulic pipe directional extrusion connection fittings, in the step b, the spindle speed of the lathe for rough machining of the outer surface of the pipe sleeve is 500-1200 r / min, the tool feed speed is 0.1-0.6 mm / r, and the cutting depth is 0.5-2 mm; the spindle speed of the boring machine for rough boring of the inner hole of the pipe sleeve is 800-1500 r / min, the tool feed speed is 0.1-0.8 mm / r, and the cutting depth is 0.1-0.8 mm.

[0012] In the above-mentioned method for manufacturing hydraulic pipe directional extrusion connection fittings, in the step c, the spindle speed of the lathe for fine machining of the outer surface of the pipe sleeve is 800-2000r / min, the tool feed speed is 0.02-0.05mm / r, and the cutting depth is 0.02-0.1mm; the spindle speed of the boring machine for fine boring of the inner hole of the pipe sleeve is 1500-3000r / min, the tool feed speed is 0.01-0.05mm / r, and the cutting depth is 0.01-0.02mm.

[0013] In the above-mentioned method for manufacturing hydraulic pipe linear extrusion connection fittings, in the step d, the sealing ring compound raw materials are dimethylsiloxane liquid and a cross-linking agent, and the ratio of the two is 5:1 to 20:1. According to different ratios of the compound raw materials and the cross-linking agent, the curing temperature can be selected in the range of 40°C to 100°C, and the curing time can be selected in the range of 1 to 10 hours.

[0014] The present invention provides a hydraulic pipe linear extrusion connection pipe fitting and a manufacturing method thereof, wherein a pipe sleeve in the hydraulic pipe linear extrusion connection pipe fitting is manufactured by mechanical processing, and a sealing ring is directly solidified in an annular sealing groove on the inner wall of the processed pipe sleeve, thereby reducing the number of parts and the overall weight of the connection pipe fitting; the present invention designs the outer surface of the pipe sleeve to be a structure of conical surfaces at both ends and a cylindrical surface in the middle, and an annular groove structure is arranged between the conical surface and the cylindrical surface, and a plurality of sections are formed by removing materials on the conical surfaces at both ends and the transition surfaces between the conical surfaces and the annular grooves, so when the hydraulic pipe linear extrusion connection pipe fitting of the present invention is used to connect the hydraulic pipeline, the pipe sleeve can be radially contracted and deformed by a special external extrusion tool, the annular groove structure on the outer surface of the pipe sleeve absorbs the axial displacement of the material during the extrusion deformation process, and the section structure absorbs the circumferential displacement of the material during the extrusion deformation process, thereby realizing reliable connection of two adjacent sections of the pipeline. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the structure of the hydraulic pipe line extrusion connection pipe fitting of the present invention; Figure 2 yes Figure 1 The main cross-sectional view of Figure 3 yes Figure 2 Schematic diagram of the AA section structure (enlarged); Figure 4 It is a schematic diagram of the cross-sectional structure of the pipe sleeve of the hydraulic pipe path extrusion connection pipe fitting; Figure 5 , Figure 6 Schematic diagram of the assembly process of hydraulic pipe routing extrusion connection fittings and conduits.

[0016] Explanation of the symbols in the figure: 1 is a pipe sleeve, 1-1 is a conical surface, 1-2 is a cut surface, 1-3 is an annular groove, 1-4 is a cylindrical surface, and 1-5 is an annular sealing groove; 2 is a sealing ring; 3 is a catheter. DETAILED DESCRIPTION

[0017] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0018] See Figure 1. Figure 2 , Figure 4 The present invention provides a hydraulic pipeline axial extrusion connection pipe fitting, which is particularly suitable for connecting aircraft hydraulic system pipelines. It includes a pipe sleeve 1 and a sealing ring 2; the pipe sleeve 1 is a bilaterally symmetrical structure, and four groups of annular sealing grooves 1-5 are arranged on its inner wall. The outer surfaces of the left and right ends of the pipe sleeve 1 are conical surfaces 1-1, and the outer surface of the middle part of the pipe sleeve 1 is a cylindrical surface 1-4. An annular groove 1-3 is arranged between the conical surfaces 1-1 at the left and right ends of the pipe sleeve 1 and the cylindrical surface 1-4 at the middle part. A plurality of cut surfaces 1-2 are formed by removing materials on the transition surfaces between the conical surfaces 1-1 at the left and right ends and the annular groove 1-3. The cut surfaces 1-2 are planes uniformly arranged along the circumference of the pipe sleeve and parallel to the axial center axis thereof. A corrosion-resistant coating is coated on the outer surface of the pipe sleeve 1 and the inner surface at the two ports; the sealing ring 2 is solidified in the annular sealing groove 1-5 on the inner wall of the pipe sleeve 1 by injecting a dimethylsiloxane compound raw material, There are at least two groups of sealing rings 2, at least one group is arranged in the annular sealing grooves 1-5 on the left and right sides, the inner diameter of the sealing ring 2 is larger than the outer diameter of the adapter catheter, and the hardness of the sealing ring 2 is 54A-60A.

[0019] See also Figure 2 , Figure 3 The hydraulic pipe axial extrusion connecting pipe fitting of the present invention has six sections 1-2 of the pipe sleeve 1 evenly arranged in the circumferential direction, forming a triangular contour line at the junction of the section 1-2 and the outer surface of the pipe sleeve 1.

[0020] See also Figure 5 , Figure 6 The hydraulic pipe path extrusion connection pipe fitting of the present invention has an outer surface of a pipe sleeve 1 designed as a structure of conical surfaces 1-1 at both ends and a cylindrical surface 1-4 in the middle, and an annular groove 1-3 structure is arranged between the conical surface 1-1 and the cylindrical surface 1-4, and a plurality of cut surfaces 1-2 are formed by removing materials on the left and right conical surfaces 1-1 and the transition surfaces between the annular groove 1-3 and the conical surfaces 1-1 at both ends. Therefore, when the hydraulic pipe path extrusion connection pipe fitting is used to connect the conduit 3 in the hydraulic pipeline, the two conduits 2 to be connected are respectively inserted from the two ends of the pipe sleeve 1 to the designated positions, and then the pipe sleeve 1 is radially contracted and deformed by a special external extrusion tool, and the axial displacement of the material during the extrusion deformation process is absorbed by the annular groove 1-3 structure on the outer surface of the pipe sleeve, and the circumferential displacement of the material during the extrusion deformation process is absorbed by the cut surface 1-2 structure on the outer surface of the pipe sleeve, thereby realizing a reliable connection between the conduits 3 in two adjacent sections of the pipeline.

[0021] See also Figure 1 , Figure 2 , Figure 3 , Figure 4 The present invention also provides a method for manufacturing a hydraulic pipe axial extrusion connection pipe fitting, including a pipe sleeve machining process and a sealing ring curing process in an annular sealing groove. The specific operation steps are as follows: a. Cutting: According to the material of the conduit in the hydraulic pipeline, the raw material of the pipe sleeve 1 can be selected from aluminum alloy, stainless steel or titanium alloy bars. When the conduit material is 0Cr21Ni6Mn9N stainless steel, Ti-3A1-2.5V titanium alloy, or 6061-T6 aluminum alloy, the raw material of the pipe sleeve 1 is 0Cr21Ni6Mn9N stainless steel bar, and passivation treatment is performed after the processing of the sleeve 1 parts; when the conduit material is Ti-3A1-2.5V needle alloy, the raw material of the pipe sleeve 1 is TA3 titanium alloy bar; when the conduit material is 6061-T4 aluminum alloy or 6061-T6 aluminum alloy, the raw material of the pipe sleeve 1 is 6061-T6 aluminum alloy bar. After completing the selection of the above bar raw materials, cut to set length; b. Rough machining: Use lathe equipment to complete the rough machining of the outer surface of the sleeve. According to the workpieces of different materials, the lathe spindle speed, tool feed speed and cutting depth parameters are set as follows: Process parameters Stainless steel Aluminum Alloy Titanium Alloy Lathe spindle speed (r / min) 800～1200 500～800 600～800 Tool feed speed (mm / r) 0.1～0.3 0.2～0.6 0.1～0.3 Cutting depth (mm) 0.5～1 1～2 0.5～1 Then, the inner hole of the tube sleeve is roughly bored by the boring machine equipment. The spindle speed, tool feed speed and cutting depth parameters of the boring machine are set according to the workpieces of different materials as follows: Process parameters Stainless steel Aluminum Alloy Titanium Alloy Boring machine spindle speed (r / min) 1200～1500 1000～1500 800～1200 Tool feed speed (mm / r) 0.1～0.2 0.3～0.5 0.5～0.8 Cutting depth (mm) 0.1～0.2 0.5～0.8 0.1～0.2 c. Finishing: Use lathe equipment to complete the finishing of the outer surface of the sleeve. Set the lathe spindle speed, tool feed speed and cutting amount parameters for workpieces of different materials as follows: Process parameters Stainless steel Aluminum Alloy Titanium Alloy Lathe spindle speed (r / min) 1500～2000 800～1200 800～1200 Tool feed speed (mm / r) 0.02～0.05 0.02～0.05 0.02～0.05 Cutting depth (mm) 0.05～0.1 0.02～0.05 0.05～0.1 Then, the inner hole of the tube sleeve is finely bored by the boring machine. The spindle speed, tool feed speed and cutting depth parameters of the boring machine are set according to the workpieces of different materials as follows: Process parameters Stainless steel Aluminum Alloy Titanium Alloy Boring machine spindle speed (r / min) 1500～2000 2000～3000 1500～2000 Tool feed speed (mm / r) 0.02～0.05 0.01～0.03 0.02～0.05 Cutting depth (mm) 0.01～0.03 0.01～0.02 0.01～0.02 d. Curing of the sealing ring: injecting the sealing ring compound raw material into the annular sealing groove 1-5 of the pipe sleeve 1 through a special tool and heating and curing it to form a sealing ring 2. The sealing ring compound raw material is dimethylsiloxane liquid and a cross-linking agent, and the ratio of the two is 5:1 to 20:1. According to different ratios of the compound raw material and the cross-linking agent, the curing temperature can be selected in the range of 40°C to 100°C, and the curing time can be selected in the range of 1 to 10 hours; e. Processing the cut surface: processing the cut surfaces 1-2 one by one along the circumference of the sleeve 1 by a milling machine; f. Apply a corrosion-resistant coating, and apply a polytetrafluoroethylene coating on the outer surface of the sleeve 1 and the inner surfaces of the two ends.

Claims

1. A hydraulic pipe directional extrusion connection pipe fitting, characterized in that: The invention comprises a pipe sleeve (1) and a sealing ring (2); the pipe sleeve (1) is a bilaterally symmetrical structure, an annular sealing groove (1-5) is provided on its inner wall, the outer surfaces of the left and right ends of the pipe sleeve (1) are conical surfaces (1-1), the outer surface of the middle part of the pipe sleeve (1) is a cylindrical surface (1-4), an annular groove (1-3) is provided between the conical surfaces (1-1) at the left and right ends of the pipe sleeve (1) and the cylindrical surface (1-4) at the middle part, a plurality of cut surfaces (1-2) are formed by removing material on the transition surfaces between the conical surfaces (1-1) at the left and right ends and the annular groove (1-3), the cut surfaces (1-2) being planes evenly arranged along the circumference of the pipe sleeve and parallel to the axial center axis thereof; the sealing ring (2) is embedded in the annular sealing groove (1-5) on the inner wall of the pipe sleeve (1).

2. The hydraulic pipe line extrusion connection pipe fitting according to claim 1, characterized in that: The cut surfaces (1-2) of the tube sleeve (1) are evenly arranged in six groups along the circumferential direction, and a triangular contour line is formed at the junction of the cut surfaces (1-2) and the outer surface of the tube sleeve (1).

3. The hydraulic pipe line extrusion connection fitting according to claim 1 or 2, characterized in that: The number of annular sealing grooves (1-5) on the inner wall of the sleeve (1) is at least four, with at least two groups arranged on the left and right sides of the inner wall of the sleeve (1); the number of sealing rings (2) is at least two, with at least one group arranged in the annular sealing grooves (1-5) on the left and right sides.

4. The hydraulic pipe line extrusion connection pipe fitting according to claim 3, characterized in that: The inner diameter of the sealing ring (2) is larger than the outer diameter of the adapting catheter, and the hardness of the sealing ring (2) is 54A-60A.

5. The hydraulic pipe line extrusion connection pipe fitting and the manufacturing method thereof according to claim 4, characterized in that: A corrosion-resistant coating is applied to the outer surface of the pipe sleeve (1) and the inner surfaces at the two ends.

6. A method for manufacturing a hydraulic pipe axial extrusion connection pipe fitting, used to realize the processing of the hydraulic pipe axial extrusion connection pipe fitting according to any one of claims 1 to 5, characterized in that: Including the process of machining the sleeve and curing the sealing ring in the annular sealing groove, the specific operation steps are as follows: a. Cutting: Select metal bars of appropriate specifications and materials as raw materials and cut them to set lengths; b. Rough machining: the outer surface of the sleeve is rough machined by lathe equipment, and then the inner hole of the sleeve is roughly bored by boring machine equipment; c. Finishing: Use lathe equipment to finish the outer surface of the sleeve, and then use boring machine equipment to finish boring the inner hole of the sleeve; d. Curing of the sealing ring: injecting the sealing ring compound raw material into the annular sealing groove of the pipe sleeve through a special tool and heating and curing it to form a sealing ring; e. Processing the cut surface: the cut surfaces are processed one by one along the circumference of the sleeve by a milling machine; f. Apply corrosion-resistant coating and apply polytetrafluoroethylene coating on the outer surface of the sleeve and the inner surface of the two ends.

7. The method for manufacturing a hydraulic pipe line extrusion connection pipe fitting according to claim 6, characterized in that: In step a, depending on the material of the conduit in the hydraulic pipeline, the raw material of the pipe sleeve (1) can be selected from aluminum alloy, stainless steel or titanium alloy bars.

8. The method for manufacturing a hydraulic pipe line extrusion connection pipe fitting according to claim 7, characterized in that: In the step b, the spindle speed of the lathe for rough machining of the outer surface of the sleeve is 500-1200 r / min, the tool feed speed is 0.1-0.6 mm / r, and the cutting depth is 0.5-2 mm; the spindle speed of the boring machine for rough boring of the inner hole of the sleeve is 800-1500 r / min, the tool feed speed is 0.1-0.8 mm / r, and the cutting depth is 0.1-0.8 mm.

9. The method for manufacturing a hydraulic pipe line extrusion connection pipe fitting according to claim 8, characterized in that: In the step c, the spindle speed of the lathe for fine machining of the outer surface of the sleeve is 800-2000 r / min, the tool feed speed is 0.02-0.05 mm / r, and the cutting depth is 0.02-0.1 mm; the spindle speed of the boring machine for fine boring of the inner hole of the sleeve is 1500-3000 r / min, the tool feed speed is 0.01-0.05 mm / r, and the cutting depth is 0.01-0.02 mm.

10. The method for manufacturing a hydraulic pipe line extrusion connection pipe fitting according to claim 9, characterized in that: In step d, the sealing ring compound raw materials are dimethylsiloxane liquid and a cross-linking agent, and the ratio of the two is 5:1 to 20:

1. According to different ratios of the compound raw materials and the cross-linking agent, the curing temperature can be selected in the range of 40°C to 100°C, and the curing time can be selected in the range of 1 to 10 hours.

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