Manufacturing method of flat flange pipe fitting

Abstract

The invention discloses a manufacturing method of a flat flanged pipe fitting, which comprises the following steps of: shearing a cylindrical blank by utilizing shearing equipment, and performing a cold heading process by each subsequent cold heading equipment to finish shaping processing of the flat flanged pipe fitting. According to the manufacturing method of the flat flange pipe fitting, the flat flange structure and the inner hole of the flat flange pipe fitting are machined through the cold heading technology, it is avoided that raw materials are cut off in a subsequent milling machining mode, the production technology is simplified, and the production cost is reduced; and in addition, the flat flange structure adopts different cold heading devices to carry out corresponding cold heading processes, assembly line work is achieved, and the production efficiency of the flat flange pipe fitting is improved. The invention relates to the technical field of cold extrusion forming processes.

Description

Technical Field

[0001] The invention relates to the technical field of cold extrusion forming process, in particular to a method for manufacturing a flat flange pipe fitting. Background Art

[0002] Flanges are a common connection component in the automobile chassis system. They are connected to other parts through the flange end faces, and the connection method is generally bolt connection or welding. Adding flats on both sides of the flange can prevent rotation during assembly and is more conducive to positioning during chassis assembly. Therefore, flanges with flats are increasingly used in automobiles.

[0003] In the past, flat flanges were mostly formed by cold forging, and then the two sides of the flange were cut by milling to obtain the flat shape of the flange. However, this processing method has low production efficiency and high production cost. Milling cuts the raw materials and consumes raw materials. Therefore, in order to improve production efficiency and reduce production costs, an innovative process for flat flange pipe fittings was developed based on the original flange upsetting process. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a method for manufacturing a flat flange pipe fitting, which can improve the production efficiency of the flat flange pipe fitting and reduce the production cost.

[0005] The method for manufacturing a flat flange pipe fitting according to an embodiment of the present invention comprises the following steps:

[0006] Using shearing equipment to shear the cylindrical blank;

[0007] Put the cylindrical blank into a first cold heading device, shape and chamfer one end of the cylindrical blank, and punch positioning holes at both ends of the cylindrical blank respectively;

[0008] Put the cylindrical blank into a second cold heading device, extrude both ends of the cylindrical blank, and press out an inner hole along the positioning hole;

[0009] Put the cylindrical blank into a third cold heading device to cold extrude a preformed flange and a flat structure on the flange;

[0010] Put the cylindrical blank into a fourth cold heading device to form the welding point of the end face and the flange;

[0011] The cylindrical blank is placed in a fifth cold heading device, and one of the inner holes in the cylindrical blank is cold extruded so that the waste thickness between the inner hole and the other inner hole meets the penetration requirement, in preparation for subsequent penetration;

[0012] The cylindrical blank is placed in the sixth cold heading device, and the waste in the inner hole is cleared out by using an ejector pin to obtain the final flat flange pipe fitting.

[0013] The flat flange pipe fittings according to the embodiments of the present invention have at least the following beneficial effects: the flat flange structure and the inner hole of the flat flange pipe fittings are processed by the cold heading process, thereby avoiding the subsequent use of milling processing to cut off the raw materials, streamlining the production process to reduce production costs; and the flat flange structure adopts different cold heading equipment to perform the corresponding cold heading process to realize assembly line operation, thereby improving the production efficiency of the flat flange pipe fittings.

[0014] According to some embodiments of the present invention, the flat flange pipe fitting includes a cylindrical rod body and a flange arranged on the outside of the rod body, a welding spot is arranged on the end face of one end of the rod body, and a notch is arranged on the side of the flange.

[0015] According to some embodiments of the present invention, the surface of the notch is a plane and does not pass through the center axis of the flat flange pipe fitting.

[0016] According to some embodiments of the present invention, there are two notches and they are symmetrically arranged, and surfaces of the two notches are parallel to each other.

[0017] According to some embodiments of the present invention, there are multiple welding points and they are distributed in a circular array around the central axis of the flat flange pipe fitting.

[0018] According to some embodiments of the present invention, the flange is disposed in the middle of the rod body and is not connected to any end surface of the rod body.

[0019] According to some embodiments of the present invention, before the cylindrical blank is sheared by a shearing device, a straightening machine is used to straighten the cylindrical blank.

[0020] According to some embodiments of the present invention, the first cold heading equipment, the second cold heading equipment, the third cold heading equipment, the fourth cold heading equipment, the fifth cold heading equipment and the sixth cold heading equipment all include the same cold heading machine, which includes a main mold, a punch and a power device, an extrusion cavity for placing the cylindrical blank is provided in the main mold, a punch is provided at the end of the punch, the main mold and the punch are driven by the power device to approach each other, and the punch can extend into the extrusion cavity and extrude the cylindrical blank.

[0021] According to some embodiments of the present invention, a punch die is installed in the extrusion cavity, and the punch dies of the first cold heading device, the second cold heading device, the third cold heading device, the fourth cold heading device, the fifth cold heading device and the sixth cold heading device are all different.

[0022] According to some embodiments of the present invention, a robot is further used in the manufacturing method of the flat flange pipe fitting, and the robot clamps the cylindrical blank and transports it to various cold heading equipment.

[0023] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0025] Figure 1 It is a cross-sectional view and a front view of a flat flange pipe fitting in a method for manufacturing a flat flange pipe fitting according to an embodiment of the present invention;

[0026] Figure 2 This is a diagram showing changes of a flat flange pipe fitting from step S100 to step S400 in a method for manufacturing a flat flange pipe fitting according to an embodiment of the present invention;

[0027] Figure 3 This is a diagram showing changes of a flat flange pipe fitting from step S500 to step S700 in a method for manufacturing a flat flange pipe fitting according to an embodiment of the present invention;

[0028] Figure 4 It is a cross-sectional view of a shearing device in a method for manufacturing a flat flange pipe fitting according to an embodiment of the present invention;

[0029] Figure 5 It is a cross-sectional view of a first cold heading device in a method for manufacturing a flat flange pipe fitting according to an embodiment of the present invention;

[0030] Figure 6 It is a cross-sectional view of a second cold heading device in the method for manufacturing a flat flange pipe fitting according to an embodiment of the present invention;

[0031] Figure 7 It is a cross-sectional view of a third cold heading device in the manufacturing method of a flat flange pipe fitting according to an embodiment of the present invention;

[0032] Figure 8 It is a cross-sectional view of a fourth cold heading device in the method for manufacturing a flat flange pipe fitting according to an embodiment of the present invention;

[0033] Fig. 9 It is a cross-sectional view of a fifth cold heading device in the method for manufacturing a flat flange pipe fitting according to an embodiment of the present invention;

[0034] Fig.10 It is a cross-sectional view of the sixth cold heading device in the method for manufacturing a flat flange pipe fitting according to an embodiment of the present invention.

[0035] Figure markings: 100-cylindrical blank, 110-positioning hole, 120-inner hole, 200-rod body, 210-welding point, 300-flange, 310-notch, 400-material shearing equipment, 410-feeding wheel, 420-shearing die, 430-scissors, 440-material stop gauge, 450-stacking rod, 500-cold heading machine, 510-main die, 511-extrusion cavity, 520-punch, 521-punch, 530-punching ejector pin, 600-die, 700-manipulator. DETAILED DESCRIPTION

[0036] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0037] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0038] In the description of the present invention, "several" means more than one, "many" means more than two, "greater than", "less than", "exceed", etc. are understood to exclude the number itself, and "above", "below", "within", etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0039] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0040] In the description of the present invention, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0041] In the past, flat flanges were mostly formed by cold forging, and then the two sides of the flange were cut by milling to obtain the flat shape of the flange. However, this processing method has low production efficiency and high production cost. Milling cuts the raw materials and consumes raw materials. Therefore, in order to improve production efficiency and reduce production costs, an innovative process for flat flange pipe fittings was developed based on the original flange upsetting process.

[0042] In this regard, the present application proposes a method for manufacturing flat flange pipe fittings, which utilizes a cold heading process to process the flat flange structure and inner hole of the flat flange pipe fittings, thereby avoiding the subsequent use of milling processing to cut off the raw materials, streamlining the production process to reduce production costs; and the flat flange structure adopts different cold heading equipment to perform the corresponding cold heading process to realize assembly line operation, thereby improving the production efficiency of flat flange pipe fittings.

[0043] Reference Figure 1 , a manufacturing method of a flat flange pipe fitting in an embodiment of the present application, the flat flange pipe fitting targeted by the method comprises a cylindrical rod body 200 and a flange 300 arranged on the outside of the rod body 200. The rod body 200 is provided with a through hole extending along the direction of its shape, and the through hole passes through the two end faces of the rod body 200. A welding point 210 is provided on the end face of one end of the rod body 200, and the welding point 210 can be used to weld and fix with other parts later. A notch 310 is provided on the side of the flange 300, thereby forming a flat structure of the flange 300. When it is subsequently installed with other parts, the notch 310 can be clamped with other parts, thereby preventing the flat flange pipe fitting from rotating.

[0044] Specifically, there are two notches 310 and they are symmetrically arranged. The surfaces of the notches 310 are planes and do not pass through the central axis of the flat flange pipe fitting, and the surfaces of the two notches 310 are parallel to each other.

[0045] There are multiple welding spots 210 and they are distributed in a circular array around the central axis of the flat flange pipe fitting to ensure a stable and uniform connection effect after welding. In this embodiment, the welding spots 210 are specifically strip-shaped and there are four of them.

[0046] Furthermore, the flange 300 is disposed in the middle of the rod body 200 and is not connected to any end surface of the rod body 200 .

[0047] With respect to the above-mentioned flat flange pipe fitting, the manufacturing method of the flat flange pipe fitting comprises the following steps:

[0048] S100. Use shearing equipment (refer to Figure 4 ) Cut the cylindrical blank 100 to obtain a blank that meets the length requirements (refer to Figure 2 a) in;

[0049] S200. Place the cylindrical blank 100 into the first cold heading device (refer to Figure 5 ), shaping and chamfering one end of the cylindrical blank 100, and punching positioning holes 110 at both ends of the cylindrical blank 100 (refer to Figure 2 b) in the figure, to prepare for subsequent punching;

[0050] S300. Place the cylindrical blank 100 into the second cold heading device (refer to Figure 6 ), the two ends of the cylindrical blank 100 are extruded, and the inner hole 120 is pressed out along the positioning hole 110 (refer to Figure 2 c) in;

[0051] S400. Place the cylindrical blank 100 into the third cold heading device (refer to Figure 7 ), cold extruded preformed flanges and flattened structures on flanges (refer to Figure 2 d) in;

[0052] S500. Place the cylindrical blank 100 into the fourth cold heading device (refer to Figure 8 ), welding point 210 of the molding end face and flange 300 (refer to Figure 3 e) in;

[0053] S600. Place the cylindrical blank 100 into the fifth cold heading device (refer to Fig. 9 ), cold extrusion is performed on one of the inner holes 120 in the cylindrical blank 100, so that the waste thickness between it and the other inner hole 120 reaches the penetration requirement, in preparation for subsequent penetration (refer to Figure 3 f) in;

[0054] S700. Place the cylindrical blank 100 into the sixth cold heading device (refer to Fig.10 ), use a ejector pin to clear out the waste material in the inner hole 120 to obtain the final flat flange pipe fitting.

[0055] Compared with the traditional production process, the manufacturing method for flat flange pipe fittings avoids using the milling process to cut the flange 300 to obtain the flat shape, but instead uses the cold heading process to complete the production and manufacturing of the flat flange pipe fittings. The types of processing techniques are reduced, thereby simplifying the processing process. Moreover, since each process step adopts the cold heading process, the cylindrical blank 100 can flow more smoothly between various cold heading equipment, realizing the assembly line production of flat flange pipe fittings, improving its production efficiency, and meeting the efficiency requirements of mass production.

[0056] Before using the shearing device 400 to shear the cylindrical blank 100 , a straightening machine is first used to straighten the cylindrical blank 100 to prevent the blank from bending and affecting the molding quality of the final product.

[0057] For the specific structure of the shearing device 400, refer to Figure 4 The shearing device 400 includes a feeding wheel 410, a shearing die 420, a scissors 430, a stop gauge 440 and a push rod 450. The wire straightened by the straightening machine is driven by the feeding wheel 410 and fed into the shearing die 420. The entrance of the shearing die 420 is trumpet-shaped to guide the wire to enter correctly. After the wire enters, the scissors 430 cut the appropriate length under the control of the stop gauge 440. The cut wire becomes a cylindrical blank 100, which is then pushed out by the push rod 450. The cylindrical blank 100 enters the subsequent cold heading process.

[0058] It is worth noting that the first cold heading device, the second cold heading device, the third cold heading device, the fourth cold heading device, the fifth cold heading device and the sixth cold heading device all include the same cold heading machine 500. The difference between the cold heading devices is that the dies 600 therein are different, so that the cylindrical blank 100 can be extruded into different shapes in the corresponding process steps.

[0059] The cold heading machine 500 includes a main die 510, a punch 520 and a power device. An extrusion cavity 511 is provided in the main die 510, and a punch 600 can be placed in the extrusion cavity 511. A cylindrical blank 100 is placed in the punch 600, and a punch 521 is provided at the end of the punch 520. The main die 510 and the punch 520 are driven by the power device to approach each other. In the process of the two approaching, the punch 521 can extend into the extrusion cavity 511 and extrude the cylindrical blank 100 to complete the cold extrusion work.

[0060] After the cold heading process is completed, a movable ejector pin 530 is further provided inside the cold heading machine 500, which contacts and applies pressure to the cylindrical blank 100, forcing it to be ejected from the die 600, thus playing a role in assisting demoulding.

[0061] Furthermore, in the manufacturing method of the flat flange pipe fitting, a manipulator 700 is also applied, and a clamping claw for clamping the cylindrical blank 100 is provided at the end thereof. After the manipulator 700 clamps the cylindrical blank 100 with the clamping claw, it can be clamped to be taken out from the die 600 and transported to various cold heading equipment. The manipulator 700 can be a multi-degree-of-freedom manipulator, which is used for clamping and moving throughout the process; or the manipulator 700 is used to grab the cylindrical blank 100 to the corresponding conveyor line, and the conveyor line completes the transportation work, and then the corresponding manipulator 700 in another step grabs the cylindrical blank 100 to realize loading.

[0062] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments. Various changes can be made within the knowledge of ordinary technicians in the relevant technical field without departing from the purpose of the present invention. In addition, the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

Claims

1. A method for manufacturing a flat flange pipe fitting, characterized in that: include: Using shearing equipment to shear the cylindrical blank; Put the cylindrical blank into a first cold heading device, shape and chamfer one end of the cylindrical blank, and punch positioning holes at both ends of the cylindrical blank respectively; Put the cylindrical blank into a second cold heading device, extrude both ends of the cylindrical blank, and press out an inner hole along the positioning hole; Put the cylindrical blank into a third cold heading device to cold extrude a preformed flange and a flat structure on the flange; Put the cylindrical blank into a fourth cold heading device to form the welding point of the end face and the flange; The cylindrical blank is placed in a fifth cold heading device, and one of the inner holes in the cylindrical blank is cold extruded so that the waste thickness between the inner hole and the other inner hole meets the penetration requirement, in preparation for subsequent penetration; The cylindrical blank is placed in the sixth cold heading device, and the waste in the inner hole is cleared out by using an ejector pin to obtain the final flat flange pipe fitting.

2. The method for manufacturing a flat flange pipe fitting according to claim 1, characterized in that: The flat flange pipe fitting comprises a cylindrical rod body and a flange arranged outside the rod body, a welding spot is arranged on the end face of one end of the rod body, and a notch is arranged on the side of the flange.

3. The method for manufacturing a flat flange pipe fitting according to claim 2, characterized in that: The surface of the notch is a plane and does not pass through the center axis of the flat flange pipe fitting.

4. The method for manufacturing a flat flange pipe fitting according to claim 3, characterized in that: There are two notches which are symmetrically arranged, and surfaces of the two notches are parallel to each other.

5. The method for manufacturing a flat flange pipe fitting according to claim 2, characterized in that: There are multiple welding points, which are distributed in a circular array around the central axis of the flat flange pipe fitting.

6. The method for manufacturing a flat flange pipe fitting according to claim 2, characterized in that: The flange is arranged in the middle of the rod body and is not connected to any end surface of the rod body.

7. The method for manufacturing a flat flange pipe fitting according to claim 1, characterized in that: Before the cylindrical blank is sheared by the shearing equipment, the cylindrical blank is straightened by the straightening machine.

8. The method for manufacturing a flat flange pipe fitting according to claim 1, characterized in that: The first cold heading device, the second cold heading device, the third cold heading device, the fourth cold heading device, the fifth cold heading device and the sixth cold heading device all include the same cold heading machine, which includes a main mold, a punch and a power device. The main mold is provided with an extrusion cavity for placing the cylindrical blank, and a punch is provided at the end of the punch. The main mold and the punch are driven by the power device to approach each other, and the punch can extend into the extrusion cavity and extrude the cylindrical blank.

9. The method for manufacturing a flat flange pipe fitting according to claim 8, characterized in that: A punching die is installed in the extrusion cavity, and the punching dies of the first cold heading device, the second cold heading device, the third cold heading device, the fourth cold heading device, the fifth cold heading device and the sixth cold heading device are all different.

10. The method for manufacturing a flat flange pipe fitting according to claim 9, characterized in that: The manufacturing method of the flat flange pipe fitting also uses a robot, which clamps the cylindrical blank and transports it to various cold heading equipment.

Images