Aluminum alloy stop valve manufacturing method and aluminum alloy stop valve

Abstract

The invention provides a manufacturing method of an aluminum alloy stop valve. The manufacturing method specifically comprises the following steps that aluminum alloy is selected and smelted; casting: casting the aluminum alloy melt into an aluminum alloy rod; homogenizing treatment of the aluminum alloy bar: putting the aluminum alloy bar cooled in the step (2) into a homogenizing furnace for homogenizing treatment; special-shaped extrusion forming is conducted, specifically, the aluminum alloy bar subjected to middle homogenization treatment is cut into short bars, and the short bars are subjected to special-shaped extrusion to form a profile with a cross-shaped longitudinal section; (5) heat treatment strengthening; cutting and blanking are conducted, specifically, the long-section valve seat aluminum alloy profile blank subjected to heat treatment strengthening is cut into a plurality of aluminum alloy stop valve blanks according to the width value of the stop valve; and the aluminum alloy stop valve is machined through a lathe. The pressure forming process is adopted, the step of forging and pressing in a traditional method is directly omitted, the defect of aluminum forging is overcome, the rejection rate is greatly reduced, and meanwhile the simplified production process is achieved. In addition, the invention further provides the aluminum alloy stop valve manufactured through the method.

Description

Technical Field

[0001] The invention belongs to the technical field of stop valves, and in particular relates to a method for manufacturing an aluminum alloy stop valve and the aluminum alloy stop valve. Background Art

[0002] At present, the mainstream stop valves are all made of brass, and a few are aluminum alloy stop valves. In addition, the existing aluminum stop valve seat production process refers to the copper stop valve production process: aluminum alloy smelting-casting aluminum rods-cast rod homogenization-extrusion round rods-cutting-rolling graphite-heating-forging-trimming-shot blasting-heat treatment strengthening-machining forming. The manufacture of traditional copper stop valves mostly relies on the forging process. This process applies pressure to the copper material through a forging press to cause it to undergo plastic deformation, thereby obtaining the required shape and size. This complex process usually includes separate cutting of the blank, stamping pretreatment, and subsequent machining. When this process is applied to the production of aluminum alloy stop valves, due to the characteristics of aluminum materials such as narrow forging temperature range, easy mold sticking and poor fluidity, there will be problems such as large deformation rate of aluminum alloy valve body, difficult forming of flange ends, many defects such as peeling, and high defect rate of forging process. In addition, it is difficult to forge aluminum stop valves with the crank press used in this process in conjunction with the half die. Summary of the invention

[0003] In view of the above problems, the present invention provides a method for manufacturing an aluminum alloy stop valve and an aluminum alloy stop valve.

[0004] To achieve the above object, the present invention adopts the following technical solution: A method for manufacturing an aluminum alloy stop valve, specifically comprising the following steps: (1) Aluminum alloy material selection and smelting; (2) Casting: Casting the aluminum alloy melt into aluminum alloy rods; (3) Aluminum alloy rod homogenization treatment: the aluminum alloy rod obtained by cooling in step (2) is placed in a homogenization furnace for homogenization treatment; (4) Special-shaped extrusion molding: Cut the aluminum alloy rod after homogenization treatment in (3) into short rods, heat the short rods to 450-550°C, and extrude the material using a 2000T or higher positive extruder, with the extrusion die temperature controlled at 400-500°C; (5) Heat treatment strengthening: the extruded profile is water-cooled to room temperature within a certain period of time, then heated to a certain temperature within a certain period of time and kept warm for several hours, then heated to a certain temperature within a certain period of time and kept warm for several hours, and finally air-cooled after being taken out of the furnace to obtain a long section valve seat aluminum alloy profile blank with a cross-shaped longitudinal section, the vertical height of the long section valve seat aluminum alloy profile blank is not less than the maximum vertical height of the stop valve, the width of the long section valve seat aluminum alloy profile blank is not less than the width of the stop valve, the height is the height of the longitudinal section of the long and short valve seat aluminum alloy profile blank, and the width is the width of the longitudinal section of the long section valve seat aluminum alloy profile blank; (6) Cutting: Cut the long section of valve seat aluminum alloy profile blank after heat treatment and strengthening into multiple aluminum alloy stop valve blanks according to the width value of the stop valve; (7) Lathe to make aluminum alloy stop valve.

[0005] With this arrangement, a press forming process is adopted, which directly omits the forging step in the traditional method, avoids the shortcomings of aluminum forging, greatly reduces the scrap rate, and realizes a simplified production process.

[0006] Furthermore, in step (6), when the stop valve is a stop valve integrated with the flange, the width is the width along the center axis of the stop valve valve mouth; when the stop valve and the flange are split structures, the width is the width perpendicular to both the center axis of the valve mouth and the center axis of the valve core mouth.

[0007] With this arrangement, the width of the blank is reduced to the actual width of the valve body when it is cut, thereby significantly saving material usage.

[0008] Furthermore, the aluminum alloy stop valve is an integrated aluminum alloy stop valve with a valve seat and a flange, comprising a valve pipe, a connecting pipe, a reinforcement part and a flange. The transverse part of the cross-shaped aluminum alloy stop valve blank obtained in step (6) is a flange forming part, and the vertical part of the cross-shaped aluminum alloy stop valve blank is a valve body forming part. The width of the transverse part is greater than the width of the vertical part. The valve body forming part comprises a first valve body forming part located below the flange plate forming part and a second valve body forming part located above the flange plate forming part. The first valve body forming part is used for forming the connecting pipe located below the flange, and the second valve body forming part is used for forming the valve pipe located above the flange, the connecting pipes located on the left and right sides of the valve pipe, and the reinforcement part. The shape of the first valve body forming part is a rectangular parallelepiped.

[0009] With such arrangement, the outer periphery of the aluminum alloy stop valve blank of this shape and structure is a regular plane or arc surface, which has good processing positioning capability, is convenient for machining fixture design, can achieve extremely high processing accuracy, and ensure good sealing performance.

[0010] Furthermore, the second forming part of the valve body includes a vertical main body, which is used for forming the reinforcement part and the valve tube. Two arc-shaped outer protrusions and two rectangular outer protrusions are mirror-symmetrically arranged from bottom to top on both sides in the width direction of the vertical main body. The two arc-shaped outer protrusions are spaced apart from the flange plate, and the center of the circle where the arcs on the two arc-shaped outer protrusions are located is the center point of the valve body forming part in the height direction, and is located on the central axis of the connecting pipes on the left and right sides of the valve tube. The diameter of the center arc-shaped outer protrusion is not less than the diameter of the external thread on the connecting pipes on the left and right sides of the valve tube; the two rectangular outer protrusions are located on the upper part of the vertical main body, and the upper end surface of the rectangular outer protrusion is located in the same plane as the upper end surface of the vertical main body. The rectangular outer protrusion is used for the thread forming processing of the valve tube cover cap.

[0011] In this way, the shape of the aluminum alloy stop valve is set to a special structural shape, the position setting of the arc-shaped outer protrusion is convenient for determining the processing positions of the second connecting pipe and the third connecting pipe during machining, and the setting of the rectangular outer protrusion is convenient for determining the processing height of the cap installation position during machining, thereby improving the machining accuracy of each stop valve; while improving the manufacturing accuracy and production efficiency of the aluminum alloy stop valve, the structural strength of the aluminum alloy stop valve is guaranteed.

[0012] Furthermore, the aluminum alloy stop valve is a split aluminum alloy stop valve with a valve seat and a flange separated, comprising a valve pipe, a first connecting pipe, a second connecting pipe, a third connecting pipe, a reinforcement portion, a flange mounting portion and a flange. The aluminum alloy stop valve blank obtained in step (6) is a valve body forming portion, and the valve body forming portion comprises a reinforcement portion forming portion, a valve body forming portion and a first connecting pipe forming portion located on the upper and lower sides of the reinforcement portion forming portion, and a second connecting pipe forming portion and a second connecting pipe forming portion located on the left and right sides of the reinforcement portion forming portion.

[0013] In this way, when the aluminum alloy stop valve and the flange are of a split structure, the aluminum alloy stop valve blank only needs to be extruded into a long cross structure, and then the blank is cut according to the width of the valve body, and then the valve seat structure is machined and formed. A flange plate is also set on the valve seat structure to achieve the effect of a traditional stop valve.

[0014] Furthermore, a first body and a flange mounting portion matching the structural dimensions of corresponding portions on the aluminum alloy stop valve are sequentially arranged from top to bottom between the reinforcement portion forming portion and the first connecting pipe forming portion.

[0015] In this way, the first body and the mounting part are directly extruded and formed on the aluminum alloy stop valve blank, which reduces the processing workload in the machining stage and improves production efficiency.

[0016] Furthermore, a third body forming part is provided on the upper part of the reinforcement forming part located on one side of the valve body forming part close to the third connecting pipe, and the upper end surface of the third body forming part is higher than the upper end surface of the third connecting pipe forming part.

[0017] With such arrangement, the height difference formed between the two parts during the anisotropic pressure forming facilitates accurate determination of the processing position of the third connecting pipe during the machining stage, thereby improving the processing accuracy and processing efficiency of the stop valve.

[0018] Furthermore, the upper end surface of the reinforcement portion formed part located on the side of the valve body formed part close to the third connecting pipe is transitionally connected to the third connecting pipe formed part through a downwardly inclined slope.

[0019] With such arrangement, the reinforcement forming part and the third connecting pipe forming part are connected via a bevel transition, which can clearly show the boundary between the third part body and the extension part, facilitating the formation of the third part body during machining and the precise positioning of the extension part.

[0020] Furthermore, the upper end surface of the reinforcement forming portion located on the side of the valve body forming portion close to the second connecting pipe is located in the same plane as the second connecting pipe forming portion; the length of the first connecting pipe forming portion in the direction of the cross-shaped transverse portion is greater than the length of the flange mounting portion, and the upper part of the side surface in the width direction of the first connecting pipe forming portion is connected to the lower end of the mounting portion through an inclined surface inclined from the outside to the inside.

[0021] In this way, the length difference between the mounting portion and the first connecting pipe forming portion makes the boundary line between the mounting portion and the first connecting pipe forming portion prominent, which facilitates the cutting and positioning of the first connecting pipe forming portion during machining.

[0022] Furthermore, an extension forming portion is provided between the reinforcement forming portion and the valve body forming portion, the extension forming portion is coaxially arranged with the valve body forming portion, the length of the extension forming portion in the cross-shaped transverse portion direction is smaller than the width of the valve body forming portion, and the lower portion of the valve body forming portion in the width direction is connected to the upper end of the extension forming portion through an inwardly inclined inclined surface.

[0023] With such arrangement, on the one hand, the length difference between the extension molding part and the valve body molding part makes the dividing line between the two prominent, which facilitates fast and accurate positioning during processing and improves production efficiency. On the other hand, it meets the cap thread processing size requirements and the cap torque strength size requirements.

[0024] An integrated aluminum alloy stop valve is manufactured according to the above method.

[0025] A combined aluminum alloy stop valve is manufactured according to the above method.

[0026] Furthermore, the flange is provided with a flange mounting hole, and the flange mounting part is inserted into the flange mounting hole; transition arcs are set at the four corners of the flange mounting hole, and the arc angle is greater than 90°; the flange is a symmetrical double-hole structure; the length of the flange mounting hole is set to J, the length of the mounting part is set to j, and I and i satisfy the relationship; 0.1≤Jj≤0.3mm; the width of the flange mounting hole 23 is set to A, and the width of the mounting part 14 is set to a, and A and a satisfy the relationship: 0.1≤Ii≤0.3mm.

[0027] With such arrangement, on the one hand, transition arcs are arranged at the four corners of the flange mounting hole, and the arc angle is greater than 90°, which ensures that the flange can be smoothly assembled with the valve body; on the other hand, there is a certain gap between the flange mounting hole and the mounting part in the width direction, which ensures that the flange can be easily installed on the mounting part, while the gap will not be too large, which ensures that the flange has sufficient strength after welding.

[0028] Compared with the prior art, the present invention has the following beneficial effects: 1. You can directly purchase heat-treated and strengthened profiles. The processing manufacturer only needs to complete the cutting and machining processes. Compared with the traditional process, it can save 5 processes, reduce equipment, site, and manpower investment, reduce production costs, and improve production efficiency; 2. Raw material manufacturers uniformly heat treat the profiles, which can save heat treatment space and is more convenient for transportation compared to the previous heat treatment of blanks; 3. The stop valve made of aluminum alloy is low in price and light in weight; aluminum alloy has good plasticity and can produce complex profiles. The stop valve blank is made by extruding the profile, and the blank is machined into the valve seat; 4. Aluminum stop valve has lower sealing torque: aluminum alloy material is soft, the sealing torque and valve core sealing torque are smaller, which is only about 60% compared with the current copper stop valve joint; 5. This method eliminates the forging process and greatly reduces the scrap rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the structure of an aluminum alloy stop valve profile blank of the integrated aluminum alloy stop valve described in an embodiment of the present invention.

[0030] Figure 2 It is a structural dimension diagram of an aluminum alloy stop valve profile blank of an integrated aluminum alloy stop valve according to an embodiment of the present invention; Figure 3 This is a schematic structural diagram of an integrated aluminum alloy stop valve according to an embodiment of the present invention; Figure 4 A top view of the integrated aluminum alloy stop valve according to an embodiment of the present invention; Figure 5It is a schematic diagram of the structure of the aluminum alloy stop valve profile blank of the split aluminum alloy stop valve described in an embodiment of the present invention.

[0031] Figure 6 It is a structural dimension diagram of an aluminum alloy stop valve profile blank of a split aluminum alloy stop valve according to an embodiment of the present invention; Figure 7 This is a schematic structural diagram of a split aluminum alloy stop valve according to an embodiment of the present invention; Figure 8 It is a cross-sectional view of the split aluminum alloy stop valve according to an embodiment of the present invention; Fig. 9 A top view of the split aluminum alloy stop valve according to an embodiment of the present invention; Fig.10 A top view of a valve body in a split aluminum alloy stop valve according to an embodiment of the present invention; Fig.11 This is a schematic diagram of the flange structure of the split aluminum alloy stop valve according to an embodiment of the present invention; Fig.12 A top view of a flange of a split aluminum alloy stop valve according to an embodiment of the present invention; Fig.13 It is a longitudinal cross-sectional view of the flange of the split aluminum alloy stop valve described in an embodiment of the present invention.

[0032] Among them, 51-flange forming part, 52-first forming part, 53-second forming part of valve body, 531-vertical main body, 532-arc-shaped outer protrusion, 533-rectangular outer protrusion, 40-valve body forming part, 41-reinforcement forming part, 42-valve body forming part, 43-first pipe forming part, 44-second pipe forming part, 45-third pipe forming part, 46-third body forming part, 10-valve body, 11-valve body, 111-valve cavity, 112-valve port, 11a-cap mounting position, 12-reinforcement part, 121-first body; 122-second body, 123-third body, 124-extension part, 13-valve pipe, 131-first pipe, 132-second pipe, 132a-connector mounting position, 133-third pipe, 14-flange mounting part; 20-flange; 23-flange hole, 20a-inner corner; 14a-upper end. DETAILED DESCRIPTION

[0033] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0034] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meanings as commonly understood by ordinary technicians in the technical field to which this application belongs.

[0035] In the present invention, unless otherwise specified, the directional words used, such as "up" and "down", usually refer to the directions shown in the drawings, or to the vertical, perpendicular or gravity directions; similarly, for ease of understanding and description, "left" and "right" usually refer to the left and right shown in the drawings; "inside" and "outside" refer to the inside and outside relative to the outline of each component itself, but the above directional words are not used to limit the present invention.

[0036] In order to solve the problems existing in the prior art of aluminum alloy stop valve manufacturing process, such as large deformation rate, difficult forming of flange end, many defects such as peeling, high defect rate in forging process, and the problem that the crank press used in the prior manufacturing method is difficult to cooperate with the half die to forge aluminum stop valves, the present application provides an aluminum alloy stop valve manufacturing method, and an aluminum alloy stop valve manufactured by the method.

[0037] A method for manufacturing an aluminum alloy stop valve, specifically comprising the following steps: (1) Aluminum alloy material selection and smelting; (2) Casting: Casting the aluminum alloy melt into aluminum alloy rods; (3) Homogenization of aluminum alloy rods: The aluminum alloy rods obtained by cooling in step (2) are placed in a homogenization furnace for homogenization treatment; the temperature of 6061 aluminum alloy is raised from room temperature to 520°C-540°C within 3 hours and kept for 12 hours, then cooled to 300°C in the furnace, and then air-cooled to room temperature; (4) Special-shaped extrusion molding: Cut the aluminum alloy rod after homogenization treatment in (3) into short rods, heat the short rods to 450-550°C, and extrude the material using a 2000T or higher positive extruder. The extrusion die temperature is controlled at 400-500°C. For different aluminum alloy materials, the extrusion molding parameters used in this step are the same; (5) Heat treatment strengthening: the extruded profile is water-cooled to room temperature within 20 seconds, then heated to 180°C within 30 minutes within 12 hours and kept warm for 2 hours, then heated to 220°C within 10 minutes and kept warm for 2 hours, and then air-cooled after being taken out of the furnace to obtain a long section valve seat aluminum alloy profile blank with a cross-shaped longitudinal section, wherein the vertical height h of the long section valve seat aluminum alloy profile blank is not less than the maximum vertical height of the stop valve, and the width g of the long section valve seat aluminum alloy profile blank is not less than the width of the stop valve, wherein the height g is the height of the longitudinal section of the long section valve seat aluminum alloy profile blank, and the width g is the width of the longitudinal section of the long section valve seat aluminum alloy profile blank; (6) Cutting: Cut the long section of valve seat aluminum alloy profile blank after heat treatment and strengthening into multiple aluminum alloy stop valve blanks according to the width value of the stop valve. When the stop valve is a flange-integrated stop valve, the width is the width m along the center axis of the stop valve valve mouth. When the stop valve and flange are split structures, the width is the width n perpendicular to the center axis of the valve mouth and the center axis of the valve core mouth, that is, the width L4 of the flange mounting portion; (7) Lathe to make aluminum alloy stop valve.

[0038] In step (1), the selected aluminum alloy is a heat-treatable aluminum alloy, which may be a 2-series, 6-series, or 7-series aluminum alloy. The temperature and time parameters during smelting are determined according to the selected aluminum alloy material model.

[0039] In step (2), the molten aluminum alloy temperature required to cast the molten aluminum alloy into aluminum bars is determined according to the selected aluminum alloy type. To ensure the structure and performance of the profile, the cast rod needs to be homogenized annealed. In step (3), different homogenization process conditions are also adopted according to the selected aluminum alloy type. For example, when the most selected aluminum alloy is 6061, the aluminum alloy rod is first heated from room temperature to 520℃-540℃ within 3 hours and kept at this temperature for 12 hours, then cooled to 300℃ in the furnace, and then air-cooled to room temperature.

[0040] It can be understood that the present application adopts a pressurized forming process, directly omitting the forging step in the traditional method, thereby avoiding the technical problems of large deformation rate of forged aluminum stop valves, difficult forming of flange ends, peeling and other defects, and high defective rate in the forging process caused by the narrow temperature range of aluminum forging, easy sticking to the mold and poor fluidity, greatly reducing the scrap rate and realizing a simplified production process.

[0041] By adopting the manufacturing method of the present invention, aluminum alloy raw material manufacturers can uniformly extrude stop valve profile blanks into the required shape in advance, and then uniformly heat treat and strengthen the extruded profile blanks. For stop valve manufacturers, they only need to complete the blanking and machining processes. On the one hand, compared with the previous heat treatment of the blanks, it can save heat treatment space and is more convenient for transportation. On the other hand, compared with the traditional process flow, it can save 5 processes, reduce equipment, site, and manpower investment, reduce production costs, and improve production efficiency.

[0042] In one embodiment, the stop valve manufactured according to the above method is an integrated aluminum alloy stop valve integrated with a flange. Specifically, the aluminum alloy stop valve includes a valve body 10, and the valve body 10 includes a valve tube 11, a reinforcement portion 12, a valve tube 13 and a flange. Among them, a valve cavity 111 and a valve port are provided in the valve tube 11, the valve tube 13 is connected to the valve tube 11, and the reinforcement portion 12 is provided on the valve tube 11 and is arranged corresponding to the position of the valve port. The reinforcement portion 12 extends toward the valve tube 13 and protrudes from the outer wall of the valve tube 11, and the reinforcement portion 12 is connected to the valve tube 13, and the reinforcement portion 12 and the valve tube 11 covered by it are rectangular as a whole.

[0043] The valve pipe 13 includes a first connecting pipe 131, a second connecting pipe 132 and a third connecting pipe 133. The first connecting pipe 131 is coaxially arranged with the valve pipe 11, the second connecting pipe 132 and the third connecting pipe 133 are both arranged perpendicular to the valve pipe, and the third connecting pipe 133 is coaxially arranged with the second connecting pipe 132. A joint installation position 132a is provided on the second connecting pipe 132. During installation, the joint nut is connected to the joint installation position 132a, the axis of the valve port is coaxially arranged with the valve pipe 11, and the axis of the second connecting pipe 132 is arranged to intersect with the axis of the valve port.

[0044] The reinforcement portion 12 includes a first body 121 and a second body 122. The first body 121 extends from the valve body 11 to the first connecting pipe 131 and is connected to the first connecting pipe 131. The second body 122 extends from the valve body 11 to the second connecting pipe 132 and is connected to the second connecting pipe 132. Preferably, the first connecting pipe 131 is coaxially arranged with the valve body 11, and the second connecting pipe 132 is arranged perpendicular to the valve body.

[0045] Furthermore, the cross section of the first body 121 is rectangular. Of course, in other embodiments, the cross section of the first body 121 can also be set to other shapes, which can be selected according to actual needs.

[0046] Furthermore, the cross section of the second body 122 is rectangular. Of course, in other embodiments, the cross section of the first body 121 can also be set to other shapes, which can be selected according to actual needs.

[0047] Specifically, a joint installation position 132a is provided on the second connecting pipe 132, and during installation, the joint nut is connected to the joint installation position 132a. The axis of the valve port 112 is coaxially arranged with the valve body 11, and the axis of the second connecting pipe 132 is arranged to intersect with the axis of the valve port 112.

[0048] The top of the valve tube 11 is provided with a cap mounting position 11a, and when installed, the cap is connected to the cap mounting position 11a. The top of the reinforcement portion 12 is provided with an extension portion 124, and the extension portion 124 extends from the reinforcement portion 12 to the cap mounting position 11a. The cross section of the extension portion 124 is rectangular. Of course, in other embodiments, the cross section of the first body 121 can also be set to other shapes, which can be selected according to actual needs.

[0049] The flange 20 is disposed below the lower end surface of the reinforcement portion 12 . The flange 20 and the valve body 10 are an integral structure. The length direction of the flange 20 extends along the front-rear direction of the reinforcement portion 12 .

[0050] In this embodiment, when the aluminum alloy stop valve is manufactured by the method of this embodiment, the longitudinal section of the aluminum alloy stop valve blank obtained in step (6) is cross-shaped, including a flange forming portion 51 and a valve body forming portion, wherein the flange forming portion 51 is a transverse portion in the cross shape, and the valve body forming portion is a vertical portion in the cross shape. The relative position of the center point of the flange forming portion 51 and the valve body forming portion in the height direction is determined according to the structure of the aluminum alloy stop valve to be manufactured. In this embodiment, the flange forming portion 51 is located in the lower middle part of the valve body forming portion.

[0051] Specifically, the valve body molding portion includes a first valve body molding portion 52 located below the flange molding portion 51 and a second valve body molding portion 53 located above the flange molding portion 51. The first valve body molding portion 52 is used for molding a first connecting pipe 131 opposite to the valve pipe, and the second valve body molding portion 53 is used for molding the valve pipe, the second connecting pipe and the third connecting pipe located on the left and right sides of the valve pipe, and the reinforcement portion.

[0052] In this embodiment, the shape of the first molded portion 52 of the valve body is a cuboid. Of course, in other embodiments, the first molded portion 52 of the valve body may also be other shapes as long as it meets the molding size requirements of the first connecting pipe 131 .

[0053] It can be understood that the outer periphery of the aluminum alloy stop valve blank of this shape structure is a regular plane or arc surface, which has good processing positioning ability, is convenient for machining fixture design, can achieve extremely high processing accuracy, and ensure good sealing performance.

[0054] In this embodiment, the second molding portion 53 of the valve body includes a vertical main body portion 531, and two arc-shaped outer protrusions 532 and two rectangular outer protrusions 533 are mirror-symmetrically arranged on both sides of the vertical main body portion 531 in the width direction from bottom to top. The two arc-shaped outer protrusions 532 are arranged at intervals from the flange plate, and the center of the circle where the arcs on the two arc-shaped outer protrusions 532 are located is the center point of the valve body molding portion in the height direction, and is located on the central axis of the second connecting pipe 132 and the third connecting pipe 133. The diameter of the center arc-shaped outer protrusion 532 is not less than the diameter of the external thread on the second connecting pipe 132, and the arc-shaped outer protrusion 532 is machined to form the second extension portion 122; the two rectangular outer protrusions 533 are located at the upper part of the vertical main body portion 531, and the upper end surface of the rectangular outer protrusion 533 and the upper end surface of the vertical main body portion 531 are located in the same plane, and the rectangular outer protrusion 533 is used for cap thread molding processing.

[0055] It can be understood that the shape of the aluminum alloy stop valve is set to a special structural shape, the position setting of the arc-shaped outer protrusion 532 is convenient for determining the processing positions of the second connecting pipe 132 and the third connecting pipe 133 during machining, and the setting of the rectangular outer protrusion 533 is convenient for determining the processing height of the cap installation position during machining, thereby improving the machining accuracy of the stop valve.

[0056] Specifically, the vertical distance between the center point of the valve body forming part in the height direction and the bottom end surface of the flange forming part 51 is defined as the center height A, the vertical distance between the center point of the valve body forming part in the height direction and its upper end surface is defined as the total height B, the width of the vertical main body 531 is defined as the neck length D, the sum of the widths of the vertical main body 531 and the two rectangular outer protrusions 533 is defined as the threaded fitting portion width C, the radius of the arc-shaped outer protrusion 532 is defined as the outer diameter E of the joint thread, the vertical distance between the lower end surface of the flange forming part 51 and the lower end surface of the valve body forming part is defined as the boss height F, and the thickness of the flange forming part 51 is G.

[0057] The size of the center height A must ensure that the joint nut can be assembled, the size of the total height B must meet the requirements of the valve core installation, the size of the threaded mating width C must meet the size requirements required for the cap thread processing, and the size of the neck length D must meet the size requirements required for the cap torque strength; the size of the joint thread outer diameter E must meet the size requirements required for the joint thread processing, the size of the boss height F must meet the size requirements required to ensure the strength of the valve body after welding; the size of the flange thickness G must meet the size requirements required to ensure the flange strength. The above-mentioned sizes are determined according to the size of the nominal diameter. According to the different ranges of the nominal diameter size, the above-mentioned sizes must meet the size ranges shown in Table 1.

[0058] Table 1 Nominal diameter mm A B C D E F G 4-5 ≥9 ≥12 ≥16 ≥15 ≥φ10 ≥6 ≥3 7-8 ≥10 ≥15 ≥16 ≥15 ≥φ15 ≥6 ≥3 9-11 ≥11 ≥18 ≥16 ≥15 ≥φ18 ≥6 ≥3 12-13 ≥12 ≥21 ≥19 ≥18 ≥φ20 ≥6 ≥4 15-16 ≥13 ≥24 ≥19 ≥18 ≥φ25 ≥6 ≥4 16-20 ≥24 ≥27 ≥21 ≥20 ≥φ30 ≥6 ≥5 It is understandable that the setting requirements of the above structural dimensions can minimize the subsequent machining amount while ensuring the machining accuracy and structural strength of the stop valve structure.

[0059] In another embodiment, the stop valve manufactured according to the above method is a combined aluminum alloy stop valve that is separately provided with a flange. Specifically, the aluminum alloy stop valve includes a valve body 10, and the valve body 10 includes a valve body 11, a reinforcement portion 12, and a valve pipe 13. Among them, a valve cavity 111 and a valve port 112 are provided in the valve body 11. The valve pipe 13 is connected to the valve body 11. The reinforcement portion 12 is provided on the valve body 11 and is provided corresponding to the position of the valve port 112. The reinforcement portion 12 extends toward the valve pipe 13 and protrudes from the outer wall of the valve body 11, and the reinforcement portion 12 is connected to the valve pipe 13.

[0060] The reinforcement portion 12 covers the outer side of the valve body 11 , and the reinforcement portion 12 and the covered portion of the valve body 11 are in a rectangular shape as a whole.

[0061] The valve body 11, the reinforcement part 12 and the valve tube 13 are an integrated structure, and the integrated structure here refers to a one-time processing through machining methods such as turning and cutting. The valve cavity 111 penetrates the valve body 11 in the height direction Z of the valve body 11, the valve tube 13 is a hollow structure and communicates with the valve cavity 111, and the valve port 112 is arranged at a position close to the connection between the valve tube 13 and the valve cavity 111, and the position of the valve port 112 is the first-line seal mentioned above.

[0062] Specifically, the valve pipe 13 includes a first connecting pipe 131 and a second connecting pipe 132. The reinforcement portion 12 includes a first body 121 and a second body 122. The first body 121 extends from the valve body 11 to the first connecting pipe 131 and is connected to the first connecting pipe 131. The second body 122 extends from the valve body 11 to the second connecting pipe 132 and is connected to the second connecting pipe 132. Preferably, the first connecting pipe 131 is coaxially arranged with the valve body 11, and the second connecting pipe 132 is arranged perpendicular to the valve pipe.

[0063] Furthermore, the cross section of the first body 121 is rectangular. Of course, in other embodiments, the cross section of the first body 121 can also be set to other shapes, which can be selected according to actual needs.

[0064] Furthermore, the cross section of the second body 122 is rectangular. Of course, in other embodiments, the cross section of the first body 121 can also be set to other shapes, which can be selected according to actual needs.

[0065] Specifically, a joint installation position 132a is provided on the second connecting pipe 132, and during installation, the joint nut is connected to the joint installation position 132a. The axis of the valve port 112 is coaxially arranged with the valve body 11, and the axis of the second connecting pipe 132 is arranged to intersect with the axis of the valve port 112.

[0066] In one embodiment, the valve tube 13 further includes a third connecting pipe 133, the third connecting pipe 133 is coaxially arranged with the second connecting pipe 132, and the first connecting pipe 131 is coaxially arranged with the valve tube. The reinforcing portion 12 further includes a third body 123, the third body 123 extends from the valve body 11 to the third connecting pipe 133 and is connected to the third connecting pipe 133. Further, the cross section of the third body 123 is rectangular. Of course, in other embodiments, the cross section of the first body 121 can also be set to other shapes, which can be selected according to actual needs.

[0067] Furthermore, a cap mounting position 11a is provided on the top of the valve body 11, and the cap is connected to the cap mounting position 11a during installation. An extension portion 124 is provided on the reinforcement portion 12, and the extension portion 124 extends from the reinforcement portion 12 to the cap mounting position 11a, and the cross section of the extension portion 124 is rectangular. Of course, as in other embodiments, the cross section of the first body 121 can also be set to other shapes, which can be selected according to actual needs.

[0068] In this embodiment, in order to ensure that the flange can be installed in the valve seat and meet the matching clearance requirements, transition arcs are set at the four corners of the flange mounting hole, and the arc angle is greater than 90°. The flange is a symmetrical double-hole structure. Of course, in other embodiments, the flange can also adopt various mounting hole forms such as single-sided single hole, single-sided double holes, etc., which can be selected according to actual needs. Furthermore, the length of the flange mounting hole 23 is set to L1, the length of the flange mounting portion 14 is set to L2, and B and b satisfy the relationship: 0.1≤L1- L2≤0.3mm. In addition, there is a certain gap between the flange mounting hole 23 and the flange mounting portion 14 in the width direction, ensuring that the flange 20 can be easily installed on the flange mounting portion 14, and at the same time the gap is not too large, ensuring that the flange 20 has sufficient strength after welding. The value of L1- L2 can be 0.1mm, 0.15mm, 0.2mm, 0.25mm, 0.3mm, etc. Of course, the value of L1- L2 can also be selected according to the actual situation, which will not be described in detail here.

[0069] Further, the width of the flange mounting hole 23 is set to L3, the width of the flange mounting portion 14 is set to -L4, and A and a satisfy the relationship: 0.1≤L3- L4≤0.3mm. . There is a certain gap between the flange mounting hole 23 and the flange mounting portion 14 in the length direction to ensure that the flange 20 can be easily installed on the flange mounting portion 14, and at the same time the gap is not too large to ensure that the flange 20 has sufficient strength after welding. The value of L3- L4 can be 0.1mm, 0.15mm, 0.2mm, 0.25mm, 0.3mm, etc. Of course, the value of L3-L4 can also be selected according to the actual situation, which will not be described in detail here.

[0070] Preferably, the thickness of the flange 20 is set to D3, D3 ≥ 5mm. The value of D3 can be 5mm, 10mm, 15mm, 20mm, etc. Of course, the value of D3 can also be selected according to the actual situation, which will not be described in detail here. Specifically, the shape of the flange mounting hole 23 can be set to, but not limited to, an ellipse, a rectangle, or a square. In the present embodiment, the flange mounting hole 23 is set to be a rectangle, and preferably a rectangle.

[0071] Preferably, the inner corner 20a of the flange mounting hole 23 is set as a chamfered structure. The chamfered structure means that the inner corner 20a is processed as a chamfer, and the angle of the chamfer can be selected according to actual needs and is not limited here. Since the profile extrusion cannot form a right angle, and then there will be a certain arc on the valve body 11, the reinforcement part 12, and the flange mounting part 14, the inner corner 20a of the flange mounting hole 23 is set as a chamfer to ensure that the flange 20 can be smoothly assembled with the valve body 10.

[0072] Preferably, the upper end 14a of the flange mounting portion 14 is also processed into a chamfer to facilitate the installation of the flange 20. The angle of the chamfer can be selected according to actual needs and is not limited here.

[0073] In this embodiment, when the combined aluminum alloy stop valve is manufactured by the method of this embodiment, the longitudinal section of the aluminum alloy stop valve blank obtained in step (6) is cross-shaped, including a valve body forming portion 40, wherein the valve body forming portion 40 includes a reinforcement forming portion 41, a valve body forming portion 42 and a first connecting pipe forming portion 43 located at the upper and lower ends of the reinforcement forming portion 41, and a second connecting pipe forming portion 44 and a third connecting pipe forming portion 45 located at the left and right sides of the reinforcement forming portion 41.

[0074] It is understandable that when the aluminum alloy stop valve and the flange are split structures, the aluminum alloy stop valve blank only needs to be extruded into a long cross structure, and then the blank is cut according to the width of the valve body, and then the valve seat structure is machined and formed, and a flange plate is additionally provided on the valve seat structure to achieve the effect of a traditional stop valve. Compared with the traditional stop valve blank structure with a double cross structure (both the main view and the top view are cross-shaped), the present application only maintains a cross-shaped structure on the main view, and the width is reduced to the actual width of the valve body when the blank is cut, thereby significantly saving material usage.

[0075] Furthermore, a first body 121 is provided on the lower portion of the reinforcement forming portion 41 , and a flange mounting portion 14 is provided on the lower end surface of the first body 121 .

[0076] It can be understood that directly extruding the first body 121 and the flange mounting portion 14 on the aluminum alloy stop valve blank reduces the processing workload in the machining stage and improves production efficiency.

[0077] The same as the finished aluminum alloy stop valve, the upper end of the flange mounting portion 14 and the first body 121 are connected with a chamfer design. Such a setting further reduces the amount of processing in the machining stage and improves production efficiency.

[0078] Furthermore, the reinforcement portion forming part 41 is provided with a third body forming part 46 at the upper part of the valve body forming part 42 on the side close to the third connecting pipe 133, and the upper end surface of the third body forming part 46 is higher than the upper end surface of the third connecting pipe forming part 45. It can be understood that the height difference formed between the two parts during the anisotropic pressure forming facilitates accurate determination of the processing position of the third connecting pipe 133 during the machining stage, thereby improving the machining accuracy and efficiency of the stop valve.

[0079] In this embodiment, in order to facilitate the formation of the third body during machining and the precise positioning of the extension, the upper end surface of the reinforcement molding portion 41 located on the side of the valve body molding portion 42 close to the third connecting pipe 133 is transitionally connected to the third connecting pipe molding portion 45 through a downwardly inclined inclined surface. Of course, in other embodiments, other transition forms can be used between the reinforcement molding portion 41 and the third connecting pipe molding portion 45, which can be selected according to actual needs.

[0080] Furthermore, the upper end surface of the reinforcement molding part 41 located on the side of the valve body molding part 42 close to the second connecting pipe 132 is located in the same plane as the second connecting pipe molding part 44. It can be understood that since the second body and the third body and the extension part are located on both sides of the valve body molding part 42 and are mirror-symmetrically arranged relative to the central axis of the valve body molding part 42, if a precision positioning dividing line is provided on one side, the other side can be omitted. Of course, in other embodiments, the upper end surface of the reinforcement molding part 41 and the upper end surface of the second connecting pipe molding part 44 can also be provided with a height difference at the same time, and an inclined surface or other forms of transition connection are used, which can be selected according to actual needs.

[0081] In this embodiment, the first pipe forming part 43 is located below the flange mounting part 14, the length of the first pipe forming part 43 is greater than the length of the flange mounting part 14, and the upper part of the side surface in the width direction of the first pipe forming part 43 is connected to the lower end of the flange mounting part 14 through an inclined surface inclined from outside to inside. It can be understood that the length difference between the flange mounting part 14 and the first pipe forming part 43 makes the boundary line between the flange mounting part 14 and the first pipe forming part 43 prominent, which is convenient for the cutting and positioning of the first pipe forming part 43 during machining, and on the other hand, ensures that the welding position has sufficient wall thickness after machining.

[0082] In this embodiment, an extension molding part 47 is provided on the upper part of the reinforcement molding part 41, and the extension molding part 47 is located directly below the valve body molding part 42, and the two are coaxially arranged. The length of the extension molding part 47 is less than the width of the valve body molding part 42, and the lower part of the valve body molding part 42 in the width direction is connected to the upper end of the extension molding part 47 through an inclined surface inclined inward. The valve body molding part 42 is used for molding the valve pipe and the cap installation position. It can be understood that, on the one hand, the length difference between the extension molding part 47 and the valve body molding part 42 makes the dividing line between the two prominent, which is convenient for rapid and accurate positioning during processing and improves production efficiency. On the other hand, it meets the cap thread processing size requirements and the cap torque strength size requirements.

[0083] The vertical distance between the center point of the valve body forming part 40 in the height direction and the bottom end surface of the third connecting pipe forming part 45 is defined as the center height a, the vertical distance between the center point of the valve body forming part 40 in the height direction and its upper end surface is defined as the total height b, the length of the extension forming part 47 is defined as the neck length d, the length of the valve body forming part is defined as the threaded fitting width c, the width of the third connecting pipe forming part 45 is e, and the height of the first connecting pipe forming part 43 is defined as the boss height f; wherein, the size of the center height a must ensure that the joint nut can be assembled, the size of the total height b must ensure the requirements of the valve core installation, the size of the threaded fitting width c must meet the dimensional requirements required for the cap thread processing, and the size of the neck length d must meet the dimensional requirements required for the cap torque strength; the size of the width e of the third connecting pipe forming part 45 must meet the dimensional requirements required for the joint thread processing, and the size of the boss height f must meet the dimensional requirements required to ensure the strength of the valve body after welding.

[0084] The above-mentioned sizes are determined according to the size of the nominal diameter. According to the different ranges of the nominal diameter size, the above-mentioned sizes must meet the size range shown in Table 2.

[0085] Table 2 Nominal diameter mm a b c d e f 4-5 ≥9 ≥12 ≥16 ≥15 ≥φ10 ≥6 7-8 ≥10 ≥15 ≥16 ≥15 ≥φ15 ≥6 9-11 ≥11 ≥18 ≥16 ≥15 ≥φ18 ≥6 12-13 ≥12 ≥21 ≥19 ≥18 ≥φ20 ≥6 15-16 ≥13 ≥24 ≥19 ≥18 ≥φ25 ≥6 16-20 ≥24 ≥27 ≥21 ≥20 ≥φ30 ≥6 It is understandable that the setting requirements of the above structural dimensions can minimize the subsequent machining amount while ensuring the machining accuracy and structural strength of the stop valve structure.

[0086] Obviously, the above-described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0087] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0088] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0089] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for manufacturing an aluminum alloy stop valve, characterized in that: The specific steps include: (1) Aluminum alloy material selection and smelting; (2) Casting: Casting the aluminum alloy melt into aluminum alloy rods; (3) Aluminum alloy rod homogenization treatment: the aluminum alloy rod obtained by cooling in step (2) is placed in a homogenization furnace for homogenization treatment; (4) Special-shaped extrusion molding: Cut the aluminum alloy rod after homogenization treatment in (3) into short rods, heat the short rods to 450-550°C, and extrude the material using a 2000T or higher positive extruder, with the extrusion die temperature controlled at 400-500°C; (5) Heat treatment strengthening: the extruded profile is water-cooled to room temperature within a certain period of time, then after a certain period of time, heated to a certain temperature within a certain period of time and kept warm for several hours, then heated to a certain temperature within a certain period of time and kept warm for several hours, finally taken out of the furnace and air-cooled to obtain a long valve seat aluminum alloy profile blank with a cross-shaped longitudinal section, the vertical height (h) of the long valve seat aluminum alloy profile blank is not less than the maximum vertical height of the stop valve, the width (g) of the long valve seat aluminum alloy profile blank is not less than the width of the stop valve, the height (h) is the height of the longitudinal section of the long and short valve seat aluminum alloy profile blank, and the width (g) is the width of the longitudinal section of the long valve seat aluminum alloy profile blank; (6) Cutting: Cut the long section of valve seat aluminum alloy profile blank after heat treatment and strengthening into multiple aluminum alloy stop valve blanks according to the width value of the stop valve; (7) Machined into aluminum alloy stop valve.

2. The method for manufacturing an aluminum alloy stop valve according to claim 1, characterized in that: In step (6), when the aluminum alloy stop valve is an integrated aluminum alloy stop valve with a valve seat and a flange, the width (g) is the width (m) along the center axis of the stop valve valve mouth; when the stop valve and the flange are split structures, the width (g) is the width (n) perpendicular to both the center axis of the valve mouth and the center axis of the valve core mouth.

3. The method for manufacturing an aluminum alloy stop valve according to claim 2, characterized in that: The aluminum alloy stop valve is an integrated aluminum alloy stop valve with a valve seat and a flange, comprising a valve pipe (13), a connecting pipe, a reinforcement part (12) and a flange (20). The transverse part of the cross-shaped aluminum alloy stop valve blank obtained in step (6) is a flange forming part (51), and the vertical part of the cross-shaped aluminum alloy stop valve blank is a valve body forming part. The width of the transverse part is greater than the width of the vertical part. The valve body forming part comprises a first valve body forming part (52) located below the flange forming part (51) and a second valve body forming part (53) located above the flange forming part (51). The first valve body forming part (52) is used for processing and forming the connecting pipe located below the flange (20), and the second valve body forming part (53) is used for processing and forming the valve pipe (13) located above the flange (20), the connecting pipes located on the left and right sides of the valve pipe (13), and the reinforcement part (12). The shape of the first valve body forming part (52) is a rectangular parallelepiped.

4. The method for manufacturing an aluminum alloy stop valve according to claim 3, characterized in that: The second molding portion (53) of the valve body comprises a vertical main body portion (531), the vertical main body portion (531) being used for molding the reinforcing portion (12) and the valve tube (13), and two arc-shaped outer protrusions (532) and two rectangular outer protrusions (533) being mirror-symmetrically arranged from bottom to top on both sides of the vertical main body portion (531) in the width direction, the two arc-shaped outer protrusions (532) being spaced apart from the flange (20) plate, and the center of the circle on which the arcs of the two arc-shaped outer protrusions (532) are located is the valve body molding portion. The molded portion is at the center point in the height direction and is located on the central axis of the connecting pipes on the left and right sides of the valve pipe (13); the diameter of the arc-shaped outer protrusion (532) is not less than the diameter of the outer thread on the connecting pipes on the left and right sides of the valve pipe (13); the two rectangular outer protrusions (533) are located on the upper part of the vertical main body (531); the upper end surface of the rectangular outer protrusion (533) and the upper end surface of the vertical main body (531) are located in the same plane; the rectangular outer protrusion (533) is used for the thread forming processing of the cap on the valve pipe (13).

5. The method for manufacturing an aluminum alloy stop valve according to claim 2, characterized in that: The aluminum alloy stop valve is a split-type aluminum alloy stop valve with a valve seat and a flange separated, comprising a valve body (11), a first connecting pipe (131), a second connecting pipe (132), a third connecting pipe (133), a reinforcement portion 12, a flange mounting portion (14) and a flange. The aluminum alloy stop valve blank obtained in step (6) is a valve body forming portion (40), wherein the valve body forming portion (40) comprises a reinforcement forming portion (41), a valve body forming portion (42) and a first connecting pipe forming portion (43) located on the upper and lower sides of the reinforcement forming portion (41), and a second connecting pipe forming portion (44) and a second connecting pipe forming portion (44) located on the left and right sides of the reinforcement forming portion (41).

6. The method for manufacturing an aluminum alloy stop valve according to claim 5, characterized in that: A first body and a flange mounting portion (14) matching the structural dimensions of corresponding portions on the aluminum alloy stop valve are provided in sequence from top to bottom between the reinforcement portion forming portion (41) and the first connecting pipe forming portion (43).

7. The method for manufacturing an aluminum alloy stop valve according to claim 6, characterized in that: The reinforcement portion forming portion (41) is provided with a third portion body forming portion (46) at an upper portion of the valve body forming portion (42) on a side close to the third connecting pipe (133), and an upper end surface of the third portion body forming portion (46) is higher than an upper end surface of the third connecting pipe (133) forming portion (45).

8. The method for manufacturing an aluminum alloy stop valve according to claim 7, characterized in that: The upper end surface of the reinforcement molding portion (41) located on the side of the valve body molding portion (42) close to the third connecting pipe (133) is connected to the third connecting pipe molding portion (46) via a downwardly inclined slope transition.

9. The method for manufacturing an aluminum alloy stop valve according to claim 8, characterized in that: The upper end surface of the reinforcement molding portion (41) located on the side of the valve body molding portion (42) close to the second connecting pipe (132) is located in the same plane as the second connecting pipe (132) molding portion (44); the length of the first connecting pipe molding portion (43) in the cross-shaped transverse direction is greater than the length of the flange mounting portion (14), and the upper part of the side surface in the width direction of the first connecting pipe molding portion (43) is connected to the lower end of the mounting portion via an inclined surface inclined from the outside to the inside.

10. The method for manufacturing an aluminum alloy stop valve according to claim 9, characterized in that: An extension molding portion (47) is provided between the reinforcement molding portion (41) and the valve body molding portion (42); the extension molding portion (47) is coaxially arranged with the valve body molding portion (42); the length of the extension molding portion (47) in the cross-shaped transverse direction is smaller than the width of the valve body molding portion (42); and the lower portion of the valve body molding portion (42) in the width direction is connected to the upper end of the extension molding portion (47) via an inwardly inclined inclined surface.

11. An integrated aluminum alloy stop valve, characterized in that: The integrated aluminum alloy stop valve is manufactured according to the method described in claim 4.

12. A combined aluminum alloy stop valve, characterized in that: The combined aluminum alloy stop valve is manufactured according to the method described in claim 10.

13. A combination according to claim 12 is an aluminum alloy stop valve, characterized in that: The flange is provided with a flange mounting hole, and the flange mounting portion (14) is inserted into the flange mounting hole; transition arcs are provided at four corners of the flange mounting hole, and the arc angle is greater than 90°; the flange is a symmetrical double-hole structure; the length of the flange mounting hole is set to J, the length of the mounting portion is set to j, and I and i satisfy the relationship; 0.1≤Jj≤0.3mm; the width of the flange mounting hole 23 is set to A, the width of the mounting portion 14 is set to a, and A and a satisfy the relationship: 0.1≤Ii≤0.3mm.

Images