Necking tool for pipe joint with tightening nut

Abstract

A closing-in tool for a pipe joint with a tightening nut comprises a limiting seat, a base, a positioning rod, an adjusting pad, a pressure-reducing lower die, a pressure-reducing upper die, a pressure-reducing sleeve and a positioning pin. The base and the limiting seat are placed on a horizontal workbench of the hydraulic machine; a positioning rod is arranged in a small hole of the base, and a positioning pin is screwed into the positioning rod; an adjusting pad is mounted on the limiting seat; the positioning rod is sleeved with a pressing lower die, a pressing upper die is installed on the upper portion of the pressing lower die, and a pressing sleeve is installed on the upper portion of the pressing upper die. 60Si2MnA with better elastic property is adopted in the lower pressure-collecting die, and the hardness of the 60Si2MnA reaches HRC58-62 after the 60Si2MnA is subjected to quenching and tempering heat treatment; the pressing upper die is made of W6Mo5Cr4V2, the hardness of the pressing upper die reaches HRC62-66 after quenching and tempering heat treatment, the limiting seat, the base, the positioning rod, the adjusting pad, the pressing sleeve and the positioning pin are made of 45 steel, the surfaces of the limiting seat, the base, the positioning rod, the adjusting pad, the pressing sleeve and the positioning pin are oxidized and blackened, and corrosion and rusting are prevented in the using process. The necking tool is simple in structure, high in machining efficiency, stable and reliable.

Description

Technical Field

[0001] The invention relates to a closing tool for a pipe joint with a tightening nut, belonging to the technical field of manufacturing mechanical processing parts. Background Art

[0002] The pipe joint with a tightening nut has the advantages of good structural sealing, simple assembly, and the nut is not easy to fall off after assembly, so as to solve the shortcomings of poor sealing and complex assembly of the pipe joints used on existing aircraft.

[0003] Therefore, pipe fittings with tightening nuts are often used in the connection of gas and oil circuits of aircraft and aero-engines. They are used frequently and in great demand. Such pipe fittings with tightening nuts are produced frequently and in large quantities.

[0004] This type of pipe fitting has a flared tightening nut, such as Figure 1 As shown, therefore, it is necessary to install a tightening nut on the inner conical end of the pipe joint and perform closing assembly and forming.

[0005] Due to the large number of pipe joint types and irregular appearance and structure, the traditional closing method cannot meet the closing assembly requirements of pipe joints with tightening nuts. Summary of the invention

[0006] The present invention aims to solve the technical problem that the existing closing method cannot meet the closing assembly molding requirements of the pipe joint with a tightening nut due to factors such as a large number of pipe joint types and irregular appearance and structure.

[0007] In order to solve the above technical problems, the present invention adopts the following technical solutions: A closing tool for a pipe joint with a tightening nut, comprising a limit seat, a base, a positioning rod, an adjustment pad, a lower compression die, an upper compression die, a compression sleeve, and a positioning pin; The base and the limit seat are placed on the horizontal workbench of the hydraulic press; A positioning rod is installed in the small hole of the base, and a positioning pin is screwed into the positioning rod; An adjustment pad is installed on the upper part of the limit seat; A lower compression die is sleeved on the positioning rod, an upper compression die is installed on the upper part of the lower compression die, and a compression sleeve is installed on the upper part of the upper compression die; The lower die is made of 60Si2MnA, and its hardness reaches HRC58-62 after quenching and tempering heat treatment; The material of the upper die is W6Mo5Cr4V2, and the hardness reaches HRC62-66 after quenching and tempering heat treatment; The limit seat, base, positioning rod, adjustment pad, pressure sleeve and positioning pin are made of 45 steel, and the surface treatment is oxidized black to prevent corrosion and rust during use.

[0008] The beneficial effects of adopting the above technical solution are: The present invention can meet the needs of closing and assembling various types of pipe joints and pipe joints with tightening nuts that have irregular shapes and structures; it is easy to use and has low requirements on the skill level of operators; it has high closing efficiency and reduces production costs; the processing quality is stable and reliable and the product qualification rate is improved; the closing tooling structure is simple, easy to process and manufacture, and has low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a structural schematic diagram of a pipe joint with a tightening nut.

[0010] Figure 2 The figure is a schematic diagram of the structure of the closing tooling of the pipe joint with a tightening nut according to the present invention.

[0011] In the figure: 1-limit seat, 2-base, 3-positioning rod, 4-adjusting pad, 5-pressure-retracting lower die, 6-pressure-retracting upper die, 7-pressure-retracting sleeve, 8-positioning pin, 9-right-angle pipe joint, 10-expansion type tightening nut. DETAILED DESCRIPTION

[0012] In order to make the objectives, technical solutions and advantages of the present invention more clear, the present invention will be further described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0013] A closing tool for a pipe joint with a tightening nut, such as Figure 2 As shown, it includes a limit seat 1, a base 2, a positioning rod 3, an adjustment pad 4, a lower pressing die 5, an upper pressing die 6, a pressing sleeve 7, and a positioning pin 8; The base 2 and the limit seat 1 are placed on the horizontal workbench of the hydraulic press; A positioning rod 3 is installed in the small hole of the base 2, and a positioning pin 8 is screwed into the positioning rod 3; An adjustment pad 4 is installed on the upper part of the limit seat 1; A compression lower die 5 is sleeved on the positioning rod 3, a compression upper die 6 is installed on the upper part of the compression lower die 5, and a compression sleeve 7 is installed on the upper part of the compression upper die 6; The lower pressing die 5 is made of 60Si2MnA with good elasticity, and its hardness reaches HRC58-62 after quenching and tempering heat treatment; The material of the upper die 6 is W6Mo5Cr4V2, and its hardness reaches HRC62-66 after quenching and tempering heat treatment. The other parts are made of 45 steel, and the surface treatment is oxidation blackening to prevent corrosion and rust during use.

[0014] The present invention is based on a pipe joint and a tightening nut, such as Figure 1The shape and dimensions shown are used as the design basis for the tooling, and a stable and reliable closing tooling is designed based on the product usage requirements.

[0015] The method of using the present invention is as follows: 1. Press the base 2 and limit seat 1 Figure 2 The position shown is placed on the horizontal workbench of the hydraulic press; 2. Then install the positioning rod 3 into the small hole of the base 2, screw the positioning pin 8 into the positioning rod 3 (the screw-in depth of the positioning pin can be adjusted according to the closing requirements), and then install the flared tightening nut 10 (with the threaded end facing downward) on the positioning rod 3; 3. Press the adjustment pad 4, the lower die 5, and the upper die 6. Figure 2 Install in sequence as shown; 4. Finally, install the inner conical end of the right-angle pipe joint 9 into the positioning pin 8, cover the compression sleeve 7, and start the hydraulic press to close the end.

[0016] Compared with the traditional rolling strengthening tooling, the present invention can bring the following beneficial effects: 1. The present invention is easy to use and requires low operator skill level; 2. The present invention has high closing efficiency and reduces production costs; 3. The processing quality of the present invention is stable and reliable, which improves the product qualification rate; 4. The closing tooling of the present invention has a simple structure, is easy to process and manufacture, and has low cost.

Claims

1. A closing tool for a pipe joint with a tightening nut, characterized in that: It comprises a limit seat (1), a base (2), a positioning rod (3), an adjustment pad (4), a compression lower die (5), a compression upper die (6), a compression sleeve (7), and a positioning pin (8); The base (2) and the limit seat (1) are placed on a horizontal workbench of a hydraulic press; A positioning rod (3) is inserted into the small hole of the base (2), and a positioning pin (8) is screwed into the positioning rod (3); An adjustment pad (4) is installed on the upper part of the limit seat (1); A lower compression mold (5) is sleeved on the positioning rod (3), an upper compression mold (6) is installed on the upper part of the lower compression mold (5), and a compression sleeve (7) is installed on the upper part of the upper compression mold (6); The lower pressing die (5) is made of 60Si2MnA, and its hardness reaches HRC58-62 after quenching and tempering heat treatment; The material of the upper die (6) is W6Mo5Cr4V2, and the hardness reaches HRC62-66 after quenching and tempering heat treatment; The limit seat (1), the base (2), the positioning rod (3), the adjustment pad (4), the pressure sleeve (7), and the positioning pin (8) are made of 45 steel, and the surface treatment is oxidized black to prevent corrosion and rust during use.

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