Manufacturing method of flange with spiral groove

Abstract

The invention discloses a manufacturing method of a flange with a spiral groove, which comprises a powder forming step and a sintering step, in the powder forming step, a forming die is adopted to press powder to form the flange with the spiral groove; the forming die comprises an upper punching die, a lower punching die and a female die located between the upper punching die and the lower punching die, a forming cavity can be formed among inner cavities of the upper punching die, the lower punching die and the female die, and the lower punching die comprises a first guide hole extending up and down and a first core rod capable of moving up and down along the first guide hole. The radial outer surface of the first core rod is provided with a protruding strip extending in a spiral mode, the protruding strip is used for forming a spiral groove of the flange, the inner wall of the first guide hole is provided with a spiral channel matched with the protruding strip, and the spiral channel can guide the protruding strip to be separated from the spiral groove of the flange. The flange with the spiral groove can be pressed, the machining procedure is omitted, and the consistency of the size of the spiral groove of each flange is ensured.

Description

Technical Field

[0001] The invention relates to the technical field of powder forming technology, and in particular to a method for manufacturing a flange with a spiral groove. Background Art

[0002] In the structure of the flange parts of the air-conditioning compressor, the flange parts are provided with a center hole, and an oil groove is provided on the inner wall of the center hole. Generally, the oil groove is a linear structure. The flange parts with linear oil grooves can be directly pressed into shape by a mold. With the improvement of compressor technology, flange parts with spiral oil grooves have been developed. Compared with flange parts with linear oil grooves, flange parts with spiral oil grooves have improved the operating performance of air-conditioning compressors.

[0003] In terms of manufacturing, after the flange parts are formed by powder pressing, they also need to be machined with machining equipment to form spiral oil grooves on the flange parts.

[0004] However, due to the error problem of cutting tools and processing equipment, the size of the spiral oil grooves processed in mass production has the problem of low consistency. Summary of the invention

[0005] 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 flange with a spiral groove, which can press out a flange with a spiral groove, saves the machining process, and ensures the consistency of the spiral groove size of each flange.

[0006] According to an embodiment of the present invention, a manufacturing method for a flange with a spiral groove includes a powder molding step and a sintering step. In the powder molding step, a molding mold is used to press powder to form a flange with a spiral groove; the molding mold includes an upper punch, a lower punch and a female die located between the upper punch and the lower punch, and a molding cavity can be formed between the upper punch, the lower punch and the inner cavity of the female die. The lower punch includes a first guide hole extending up and down, and a first core rod that can move up and down along the first guide hole. The radial outer surface of the first core rod has a spirally extending convex strip, and the convex strip is used to form the spiral groove of the flange. The inner wall of the first guide hole has a spiral path matching the convex strip, and the spiral path can guide the convex strip to separate from the spiral groove of the flange.

[0007] A method for manufacturing a flange with a spiral groove according to an embodiment of the present invention has at least the following beneficial effects: 1. The present invention sets a powder molding step and a sintering step. The powder molding step can press the powder into a flange with a spiral groove, and then the flange is subjected to a sintering step. There is no need to use additional machining equipment to process the spiral groove, and the machining step between the powder molding step and the sintering step is omitted. The flange with the spiral groove can be pressed and formed at one time, which greatly improves production efficiency and increases production capacity.

[0008] 2. The present invention fills the powder into the molding cavity by setting an upper punch, a lower punch and a female die. The upper punch, the lower punch and the female die are closed to press the powder in the molding cavity to form a flange. In addition, the first core rod can form a center hole of the flange, and the convex strip on the first core rod can form a spiral groove on the wall of the center hole. During demolding, the first core rod is separated from the center hole of the flange. At the same time, the convex strip moves along the spiral path to rotate the first core rod, and the convex strip is separated from the spiral groove of the flange. Since the movement trajectory of the convex strip is limited by the spiral path, the convex strip is separated from the spiral groove without damaging the flange, thereby ensuring the dimensional accuracy and stability of the flange with the spiral groove and ensuring the consistency of the spiral groove size of each flange.

[0009] According to a method for manufacturing a flange with a spiral groove in an embodiment of the present invention, the bottom end of the first core rod is rotatably connected to a transfer seat, the bottom end of the first core rod is coaxially provided with a circular step, and the transfer seat is provided with a accommodating cavity matching the circular step.

[0010] According to a method for manufacturing a flange with a spiral groove in an embodiment of the present invention, the adapter seat includes a first sub-body and a second sub-body connected to each other, and the accommodating cavity is formed between the first sub-body and the second sub-body.

[0011] According to a method for manufacturing a flange with a spiral groove according to an embodiment of the present invention, a wear-reducing plate is arranged in the accommodating cavity, and the wear-reducing plate abuts against the bottom end of the circular step.

[0012] According to a method for manufacturing a flange with a spiral groove in an embodiment of the present invention, an oil containing groove is provided on the side of the wear reducing plate facing the circular step, the oil containing groove is used to contain lubricant, and the oil containing groove extends spirally around the center of the wear reducing plate.

[0013] According to a method for manufacturing a flange with a spiral groove in an embodiment of the present invention, the first core rod has a shaft portion, the shaft portion is arranged on the side of the circular step away from the wear-reducing plate, the shaft portion is sleeved with a bearing, the bearing is located in the accommodating cavity and the radial outer side of the bearing matches the inner wall of the accommodating cavity.

[0014] According to a method for manufacturing a flange with a spiral groove in an embodiment of the present invention, the lower punch die includes a lower punch and a second lower punch, the lower punch is slidably arranged between the inner cavity of the female die and the second lower punch, and the second lower punch is provided with the first guide hole.

[0015] According to a method for manufacturing a flange with a spiral groove in an embodiment of the present invention, the lower punch die includes a fixing seat, and the two lower punches are provided with connecting parts, and the two lower punches are connected to the fixing seat through the connecting parts.

[0016] According to a method for manufacturing a flange with a spiral groove in an embodiment of the present invention, the lower punch comprises a second core rod, the lower punch is provided with a second guide hole extending up and down, and the second core rod can move up and down along the second guide hole.

[0017] According to an embodiment of the present invention, a method for manufacturing a flange with a spiral groove further includes a steam treatment step, which is arranged after the sintering step and is used to form a hard oxide layer on the surface of the flange.

[0018] 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

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 This is a schematic structural diagram of a flange with a spiral groove according to an embodiment of the present invention; Figure 2 A schematic structural diagram of a forming die for a method for manufacturing a flange with a spiral groove according to an embodiment of the present invention; Figure 3 for Figure 2 The structural schematic diagram of the powder filling state of the molding die is shown; Figure 4 for Figure 2 The structural schematic diagram of the molding die in the mold closing state is shown; Figure 5 for Figure 2 A schematic structural diagram of a first core rod of a forming die is shown; Figure 6 for Figure 5 A top view of a first mandrel of the forming die is shown; Figure 7 for Figure 2 The structural schematic diagram of the second lower punch of the forming die is shown; Figure 8 for Figure 7A top view of a first mandrel of the forming die is shown; Fig. 9 for Figure 2 A top view of the wear reducing plate of the molding die is shown; Fig.10 The present invention is a flowchart of a method for manufacturing a flange with a spiral groove according to an embodiment of the present invention.

[0021] Figure markings: 100-upper punch, 110-lower punch, 120-female die, 130-forming cavity, 140-first guide hole, 150-first core rod, 160-convex strip, 170-spiral path, 180-adapter seat, 190-circular step, 200-accommodating cavity, 210-first split body, 220-second split body, 230-friction reducing plate, 240-oil containing groove, 250-shaft portion, 260-bearing, 270-first lower punch, 280-second lower punch, 290-fixed seat, 300-connecting portion, 310-second core rod, 320-second guide hole, 330-flange, 340-center hole, 350-spiral groove. DETAILED DESCRIPTION

[0022] 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.

[0023] In the description of the present invention, it is necessary to understand that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the 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 cannot be understood as a limitation on the present invention.

[0024] In the description of the present invention, "several" means one or more, "more" 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 and second, this is only for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0025] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation, connection and connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] A method for manufacturing a flange with a spiral groove according to an embodiment of the present invention will be described below with reference to the accompanying drawings.

[0027] The present invention aims to provide an embodiment of a method for manufacturing a flange with a spiral groove.

[0028] In the structure of flange 330, refer to Figure 1 The flange 330 is provided with a center hole 340, and the center hole 340 is provided with a spiral groove.

[0029] A method for manufacturing a spiral groove flange 330 according to an embodiment of the present invention is as follows: Fig.10 , including a powder forming step, a sintering step, a steam treatment step, an inspection step and a packaging step.

[0030] The powder molding step refers to filling the powder into the molding cavity 130 of the molding mold, closing the molding mold, applying a certain pressure, and the molding mold presses the powder to form a flange 330 with a spiral groove 350. The pressed flange 330 has stable dimensional accuracy.

[0031] The sintering step refers to placing the flange 330 inside a sintering furnace. At high temperature, the powder inside the flange 330 is bonded to improve the strength of the flange 330 .

[0032] Among them, the water vapor treatment step means that the water vapor treatment step is set after the sintering step, and the powder flange 330 is placed in a high-temperature water vapor environment to form a hard oxide layer on the surface of the flange 330, thereby increasing the surface hardness, improving the service life of the parts under friction and wear conditions, and enhancing the corrosion resistance of the parts.

[0033] The inspection step refers to inspecting the appearance and size of the flange 330 manually or by equipment, selecting defective flanges 330 and ensuring that the product meets the requirements.

[0034] The application of the above processing method has the following benefits: by setting a powder forming step and a sintering step, the powder forming step can press the powder into a flange 330 with a spiral groove 350, and then the flange 330 is subjected to a sintering step. There is no need to use additional machining equipment to process the spiral groove 350, and the machining step between the powder forming step and the sintering step is omitted. The flange 330 with the spiral groove 350 can be pressed and formed in one step, which greatly improves production efficiency and increases production capacity. In addition, by setting up a water vapor treatment, a high-hardness oxide layer can be obtained on the surface of the flange 330, thereby improving the wear resistance and corrosion resistance of the parts and making the surface of the flange 330 smoother.

[0035] In the construction of the molding die, refer to Figure 4 The molding die includes an upper punch 100, a lower punch 110, and a female die 120 located between the upper punch 100 and the lower punch 110. A molding cavity 130 can be formed between the inner cavities of the upper punch 100, the lower punch 110, and the female die 120. The lower punch 110 includes a first guide hole 140 extending up and down, and a first core rod 150 that can move up and down along the first guide hole 140. Figure 6 The radial outer surface of the first core rod 150 has a spirally extending convex strip 160, and the convex strip 160 is used to form a spiral groove 350 of the flange 330, referring to Figure 7 The inner wall of the first guide hole 140 has a spiral track 170 matching the convex strip 160 , and the spiral track 170 can guide the convex strip 160 to separate from the spiral groove 350 of the flange 330 .

[0036] The advantages of using the above-mentioned forming mold to manufacture the flange 330 are as follows: the powder is filled into the forming cavity 130, and the upper punch 100, the lower punch 110 and the female die 120 are combined to press the powder in the forming cavity 130 to form the flange 330, and the first core rod 150 can form the center hole 340 of the flange 330, and the convex strip 160 on the first core rod 150 can form the spiral groove 350 on the wall of the center hole 340. When demolding, the first core rod 150 is separated from the center hole 340 of the flange 330. 0, the length of the convex strip 160 is greater than the length of the spiral groove 350, the convex strip 160 can move along the spiral path 170, so that the first core rod 150 rotates, and the convex strip 160 is separated from the spiral groove 350 of the flange 330. Since the moving trajectory of the convex strip 160 is limited by the spiral path 170, the convex strip 160 is separated from the spiral groove 350 without damaging the flange 330, thereby ensuring the dimensional accuracy and stability of the flange 330 with the spiral groove 350, and ensuring the consistency of the size of the spiral groove 350 of each flange 330.

[0037] In some embodiments of the present invention, the lower punch die 110 includes a lower punch 270 and a second lower punch 280 . The lower punch 270 is slidably disposed between the inner cavity of the female die 120 and the second lower punch 280 . The second lower punch 280 is provided with a first guide hole 140 .

[0038] Specifically, a guide cavity is provided on the lower punch 270, and the lower punch 270 is slidably mounted on the second lower punch 280 through the guide cavity.

[0039] Therefore, when filling powder, the first core rod 150 moves upward along the first guide hole 140, the lower punch 270 moves upward, and the female mold 120 moves upward to form a molding cavity 130. The molding cavity 130 corresponds to the shape of the flange 330, and the powder can be filled into the molding cavity 130. When closing the mold, the upper punch 100 moves downward to press the powder in the molding cavity 130 to form a flange 330 with a spiral groove 350. When demolding, the first core rod 150 moves downward along the first guide hole 140, the lower punch 270 moves downward, and the female mold 120 moves downward. The first core rod 150, the lower punch 270, the second lower punch 280 and the top of the female mold 120 are on the same horizontal plane. The upper punch 100 moves upward to demold the flange 330.

[0040] In some embodiments of the present invention, reference Figure 2 and Figure 6 The lower punch die 110 includes a fixing seat 290 , and the second lower punch 280 is provided with a connecting portion 300 , and the second lower punch 280 is connected to the fixing seat 290 through the connecting portion 300 .

[0041] By setting a fixing seat 290, the two lower punches 280 are fixed on the fixing seat 290 through the connecting part 300. When the first core rod 150 moves up and down in the first guide hole 140, the two lower punches 280 are fixed. When demolding, the convex strip 160 moves along the spiral path 170, and the first core rod 150 moves downward and rotates at the same time, so that the convex strip 160 can be separated from the spiral groove 350 of the flange 330. Since the moving trajectory of the convex strip 160 is limited by the spiral path 170, the convex strip 160 can be separated from the spiral groove 350 without damaging the flange 330.

[0042] In some embodiments of the present invention, the lower punch 110 includes a second core rod 310 , and one lower punch 270 is provided with a second guide hole 320 extending up and down, and the second core rod 310 can move up and down along the second guide hole 320 .

[0043] It is understandable that when the mold is closed, the second core rod 310 moves upward along the second guide hole 320 , and when the mold is released, the second core rod 310 moves downward along the second guide hole 320 , and the second core rod 310 can form a through hole in the radial direction of the flange 330 .

[0044] In some embodiments of the present invention, reference Figure 2 and Figure 4 The bottom end of the first core rod 150 is rotatably connected to the adapter seat 180 , the bottom end of the first core rod 150 is coaxially provided with a circular step 190 , and the adapter seat 180 is provided with a accommodating cavity 200 matching the circular step 190 .

[0045] It should be noted that the first core rod 150 can be connected to an external power source through the adapter 180. When the external power source drives the first core rod 150 to move up and down, the circular step 190 is used to rotate in the accommodating cavity 200, so that the first core rod 150 can also achieve a rotational action when moving up and down.

[0046] In some embodiments of the present invention, the adapter 180 includes a first split body 210 and a second split body 220 that are connected to each other, and a receiving chamber 200 is formed between the first split body 210 and the second split body 220 .

[0047] Specifically, the first split body 210 is provided with a through hole connected to the accommodating cavity 200, and the diameter of the through hole is smaller than the diameter of the accommodating cavity 200. The first core rod 150 can be inserted into the through hole, and then the circular step 190 is confined in the accommodating cavity 200, and then the first split body 210 and the second split body 220 are connected and fixed with bolts, so that the first core rod 150 will not be separated from the adapter seat 180, thereby making the installation between the first core rod 150 and the adapter seat 180 more convenient.

[0048] In some embodiments of the present invention, a friction reducing plate 230 is disposed in the accommodating cavity 200 , and the friction reducing plate 230 abuts against the bottom end of the circular step 190 .

[0049] Since the circular step 190 rotates in the accommodating chamber 200, the friction between the bottom of the circular step 190 and the bottom wall of the accommodating chamber 200 is relatively large. The bottom of the circular step 190 and the bottom wall of the accommodating chamber 200 are separated by the wear reducing plate 230 to avoid direct contact between the bottom of the circular step 190 and the bottom wall of the accommodating chamber 200. The wear reducing plate 230 can reduce the friction between the bottom of the circular step 190 and the bottom wall of the accommodating chamber 200.

[0050] In some embodiments of the present invention, reference Fig. 9 An oil containing groove 240 is provided on the side of the wear reducing plate 230 facing the circular step 190 . The oil containing groove 240 is used to contain lubricant. The oil containing groove 240 extends spirally around the center of the wear reducing plate 230 .

[0051] It is understandable that when the circular step 190 rotates on the wear reducing plate 230 , the spiral oil containing groove 240 can evenly distribute the lubricant on the surface of the wear reducing plate 230 , thereby greatly reducing the friction of the circular step 190 .

[0052] In some embodiments of the present invention, the first core rod 150 has a shaft portion 250, which is arranged on the side of the circular step 190 away from the wear reducing plate 230, and the shaft portion 250 is provided with a bearing 260, which is located in the accommodating cavity 200 and the radial outer side of the bearing 260 matches the inner wall of the accommodating cavity 200.

[0053] It is understandable that the bearing 260 can be a needle bearing 260, which can avoid direct contact between the circular step 190 and the circumferential inner wall of the accommodating cavity 200, reduce the friction of the first core rod 150, and increase the service life of the first core rod 150. At the same time, it makes the first core rod 150 rotate stably and ensures the molding accuracy of the spiral groove 350 of the flange 330.

[0054] Therefore, the process of forming the flange 330 by the molding die is: When filling powder, refer to Figure 3 The second lower punch 280 is fixed, and driven by an external power source, the convex strip 160 moves along the spiral path 170, and the first core rod 150 moves upward and rotates along the first guide hole 140. In addition, a lower punch 270 moves upward, the female mold 120 moves upward, and the second core rod 310 moves upward to form a molding cavity 130. The molding cavity 130 corresponds to the shape of the flange 330, and powder can be filled into the molding cavity 130.

[0055] When closing the mold, refer to Figure 4 , the upper punch 100 moves downward, applies a certain pressure, and presses the powder in the molding cavity 130 to form a flange 330 with a spiral groove 350 .

[0056] When demoulding, refer to Figure 2 , the two lower punches 280 are fixed, and driven by an external power source, the first core rod 150 moves downward and rotates along the first guide hole 140, and the lower punch 270 moves downward, the female mold 120 moves downward, the first core rod 150, the lower punch 270, the second lower punch 280 and the top of the female mold 120 are on the same horizontal plane, the upper punch 100 moves upward, and the second core rod 310 moves downward, so that the flange 330 can be demolded, and, because the moving trajectory of the convex strip 160 is limited by the spiral track 170, the convex strip 160 is separated from the spiral groove 350 of the flange 330.

[0057] In the description of this specification, the description with reference to the terms "one embodiment, some embodiments, illustrative embodiments, examples, specific examples or some examples" etc. 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.

[0058] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. A method for manufacturing a flange with a spiral groove, characterized in that: The method comprises a powder forming step and a sintering step. In the powder forming step, a forming die is used to press powder to form a flange (330) with a spiral groove (350); The molding die comprises an upper punch (100), a lower punch (110) and a female die (120) located between the upper punch (100) and the lower punch (110); a molding cavity (130) can be formed between the inner cavities of the upper punch (100), the lower punch (110) and the female die (120); the lower punch (110) comprises a first guide hole (140) extending up and down, and a first core rod (150) movable up and down along the first guide hole (140); the radial outer surface of the first core rod (150) comprises a spirally extending convex strip (160); the convex strip (160) is used to form a spiral groove (350) of the flange (330); the inner wall of the first guide hole (140) comprises a spiral path (170) matching the convex strip (160); the spiral path (170) can guide the convex strip (160) to separate from the spiral groove (350) of the flange (330).

2. The method for manufacturing a flange with a spiral groove according to claim 1, characterized in that: The bottom end of the first core rod (150) is rotatably connected to an adapter seat (180), the bottom end of the first core rod (150) is coaxially provided with a circular step (190), and the adapter seat (180) is provided with a receiving cavity (200) matching the circular step (190).

3. The method for manufacturing a flange with a spiral groove according to claim 2, characterized in that: The adapter seat (180) comprises a first split body (210) and a second split body (220) which are connected to each other, and the accommodation cavity (200) is formed between the first split body (210) and the second split body (220).

4. The method for manufacturing a flange with a spiral groove according to claim 2, characterized in that: A wear-reducing plate (230) is arranged in the accommodating cavity (200), and the wear-reducing plate (230) abuts against the bottom end of the circular step (190).

5. The method for manufacturing a flange with a spiral groove according to claim 4, characterized in that: An oil containing groove (240) is provided on the side of the wear reducing plate (230) facing the circular step (190), the oil containing groove (240) being used to contain lubricant, and the oil containing groove (240) extending in a spiral shape around the center of the wear reducing plate (230).

6. The method for manufacturing a flange with a spiral groove according to claim 4, characterized in that: The first core rod (150) has a shaft portion (250), the shaft portion (250) being arranged on a side of the circular step (190) away from the wear reducing plate (230), the shaft portion (250) being sleeved with a bearing (260), the bearing (260) being located in the accommodating cavity (200), and the radial outer side of the bearing (260) matching the inner wall of the accommodating cavity (200).

7. The method for manufacturing a flange with a spiral groove according to claim 1, characterized in that: The lower punch die (110) comprises a lower punch (270) and a second lower punch (280), wherein the lower punch (270) is slidably disposed between the inner cavity of the female die (120) and the second lower punch (280), and the second lower punch (280) is provided with the first guide hole (140).

8. The method for manufacturing a flange with a spiral groove according to claim 7, characterized in that: The lower punch die (110) comprises a fixing seat (290), and the second lower punch (280) is provided with a connecting portion (300), and the second lower punch (280) is connected to the fixing seat (290) via the connecting portion (300).

9. The method for manufacturing a flange with a spiral groove according to claim 7, characterized in that: The lower punch (110) comprises a second core rod (310), and the lower punch (270) is provided with a second guide hole (320) extending up and down, and the second core rod (310) can move up and down along the second guide hole (320).

10. The method for manufacturing a flange with a spiral groove according to claim 1, characterized in that: It also includes a water vapor treatment step, which is arranged after the sintering step, and is used to form an oxide layer on the surface of the flange (330).

Images