Crankshaft forge piece manufacturing method, crankshaft forge piece, crankshaft and compressor

Abstract

The invention discloses a manufacturing method of a crankshaft forge piece, the crankshaft forge piece, a crankshaft and a compressor, and relates to the technical field of compressor crankshafts. The manufacturing method of the crankshaft forge piece comprises the steps that a steel bar is cut into a crankshaft blank, and the local position of the first end of the crankshaft blank is heated; the first end of the heated crankshaft blank faces upwards, the heated crankshaft blank is placed in the lower die cavity, the upper die cavity and the lower die cavity are closed, a crankshaft forged piece is forged, the forged crankshaft forged piece sequentially comprises a short shaft section, an eccentric shaft section, a transition section and a long shaft section from top to bottom, and the peripheral wall of the eccentric shaft section has a first pattern draft. According to the manufacturing method of the crankshaft forge piece, the crankshaft forge piece can be obtained only by locally heating the steel bar and then locally forging the eccentric part and the short shaft part of the crankshaft, and the manufacturing method is simple, high in forming efficiency, small in machining allowance and low in energy consumption.

Description

Technical Field

[0001] The present invention relates to the technical field of compressor crankshafts, and in particular to a method for manufacturing a crankshaft forging, a crankshaft forging, a crankshaft and a compressor. Background Art

[0002] In the field of compressor manufacturing, the traditional processing method for crankshafts is to use die casting or pouring to complete the crankshaft casting, and then complete the rough processing of the crankshaft through turning, milling, drilling and other processing methods. However, the traditional processing method has a long process route, large processing allowance, long production cycle, and high energy consumption. In addition, die casting or pouring is generally only applicable to materials such as cast iron, and is difficult to apply to the processing of steel materials, and is not suitable for the processing of steel crankshafts. Summary of the invention

[0003] 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 crankshaft forging, which adopts a processing method of forging after local heating of steel bars, has high forming efficiency, small processing allowance and low energy consumption.

[0004] The present invention also provides a crankshaft forging manufactured according to the manufacturing method of the crankshaft forging, and a crankshaft and a compressor manufactured using the crankshaft forging.

[0005] According to the first aspect of the present invention, a method for manufacturing a crankshaft forging comprises: cutting a crankshaft blank from a steel bar; heating a local position of a first end of the crankshaft blank; placing the first end of the heated crankshaft blank upward in a lower die cavity; closing the upper die cavity and the lower die cavity to forge the crankshaft forging; wherein the crankshaft forging comprises, from top to bottom, a short shaft section, an eccentric shaft section, a transition section and a long shaft section, and the outer peripheral wall of the eccentric shaft section has a first draft angle.

[0006] The method for manufacturing a crankshaft forging according to an embodiment of the present invention has at least the following beneficial effects: A crankshaft blank is cut from a steel bar, a local position of the first end of the crankshaft blank is heated, the first end of the heated crankshaft blank is placed upward in a lower die cavity, the upper die cavity and the lower die cavity are closed to forge a crankshaft forging, so that the forged crankshaft forging includes a short shaft section, an eccentric shaft section, a transition section and a long shaft section from top to bottom, and the outer peripheral wall of the eccentric shaft section has a first draft angle; the manufacturing method of this embodiment only requires local heating of the steel bar, and then local forging of the eccentric part and the short shaft part of the crankshaft to obtain the crankshaft forging, and the manufacturing method is simple, the forming efficiency is high, the processing allowance is small, and the energy consumption is low.

[0007] According to some embodiments of the present invention, the method further includes: processing the eccentric shaft segment of the crankshaft forging into a cylindrical shape.

[0008] According to some embodiments of the present invention, the outer peripheral wall of the short shaft segment has a second draft angle, and the method for manufacturing the crankshaft forging further includes: processing the short shaft segment of the crankshaft forging into a cylindrical shape.

[0009] According to some embodiments of the present invention, the outer peripheral wall of the eccentric shaft segment is inclined inward from top to bottom, and the outer peripheral wall of the short shaft segment is inclined outward from top to bottom.

[0010] According to some embodiments of the present invention, the first draft angle a satisfies: 0°<a≤2°, and the second draft angle b satisfies: a<b.

[0011] According to some embodiments of the present invention, heating a local position of the first end of the crankshaft blank includes: heating a position of the crankshaft blank corresponding to the transition section, the eccentric shaft section and the short shaft section.

[0012] According to some embodiments of the present invention, the total length L of the crankshaft forging, the length L0 of the short shaft segment, the length L1 of the eccentric shaft segment and the length L2 of the transition segment satisfy: L / 3<(L0+L1+L2)<L / 2.

[0013] According to some embodiments of the present invention, the lower mold cavity includes a long axis cavity, a transition cavity and an eccentric shaft cavity, the long axis cavity is used to fit the long axis segment, the transition cavity is used to extrude the transition segment, and the eccentric shaft cavity is used to extrude the eccentric shaft segment; the upper mold cavity includes a short axis cavity, and the short axis cavity is used to extrude the short axis segment.

[0014] According to the second aspect of the present invention, the crankshaft forging comprises: a short shaft section, an eccentric shaft section, a transition section and a long shaft section, wherein the short shaft section, the eccentric shaft section, the transition section and the long shaft section are arranged in sequence from top to bottom, and the outer peripheral wall of the eccentric shaft section has a first draft angle.

[0015] The crankshaft forging according to the embodiment of the present invention has at least the following beneficial effects: The long shaft section of the crankshaft forging does not need to participate in the forging process, has a small machining allowance, and no longer requires subsequent turning. The short shaft section and the eccentric shaft section require a small amount of subsequent turning, which is conducive to improving processing efficiency.

[0016] According to some embodiments of the present invention, the outer peripheral wall of the short shaft segment has a second draft angle; the outer peripheral wall of the eccentric shaft segment is inclined inward from top to bottom, and the outer peripheral wall of the short shaft segment is inclined outward from top to bottom.

[0017] According to some embodiments of the present invention, the outer peripheral wall of the short axis segment has a second draft angle; the first draft angle a satisfies: 0°<a≤2°, and the second draft angle b satisfies: a<b.

[0018] According to some embodiments of the present invention, the total length L of the crankshaft forging, the length L0 of the short shaft segment, the length L1 of the eccentric shaft segment and the length L2 of the transition segment satisfy: L / 3<(L0+L1+L2)<L / 2.

[0019] According to the crankshaft of the embodiment of the third aspect of the present invention, the crankshaft is made of the crankshaft forging described in the above embodiment.

[0020] According to some embodiments of the present invention, the crankshaft includes a main shaft, a secondary shaft, an eccentric portion and a transition portion, the outer diameter of the main shaft Φ3, the outer diameter of the secondary shaft Φ0, the outer diameter of the eccentric portion Φ1, the maximum outer diameter of the transition portion Φ2, the inner diameter of the center oil hole Φ4, the length of the eccentric portion L3, the length of the secondary shaft L4, and the eccentricity e of the crankshaft satisfy: Φ1≤2*Φ0; Φ2≤Φ1; Φ4≤0.5*Φ0; L3≤Φ1; (Φ1-Φ0)*L4≤(Φ1-Φ3)*L3; e≤0.5*Φ0.

[0021] A compressor according to an embodiment of the fourth aspect of the present invention comprises the crankshaft described in the above embodiment.

[0022] 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

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein: Figure 1 A flowchart of a method for manufacturing a crankshaft forging according to an embodiment of the present invention; Figure 2 A schematic structural diagram of a crankshaft blank in a method for manufacturing a crankshaft forging according to an embodiment of the present invention; Figure 3 A schematic diagram of the structure of an upper die, a lower die and a push rod in a method for manufacturing a crankshaft forging according to an embodiment of the present invention; Figure 4 A structural stereogram of a crankshaft forging according to an embodiment of the present invention; Figure 5 A schematic diagram of the structure of a crankshaft forging according to an embodiment of the present invention; Figure 6 A flowchart of a method for manufacturing a crankshaft forging according to another embodiment of the present invention; Figure 7 A flowchart of a method for manufacturing a crankshaft forging according to another embodiment of the present invention; Figure 8 A schematic structural diagram of a roughly processed crankshaft product according to another embodiment of the present invention; Fig. 9A flowchart of a method for manufacturing a crankshaft forging according to another embodiment of the present invention; Fig.10 A flowchart of a method for manufacturing a crankshaft forging according to another embodiment of the present invention; Fig.11 A schematic diagram of the structure of a crankshaft according to an embodiment of the present invention; Fig.12 for Fig.11 A schematic top view of the crankshaft is shown.

[0024] Figure Number: Crankshaft blank 100; first end 110; Crankshaft forging 200; short shaft section 210; eccentric shaft section 220; transition section 230; long shaft section 240; Crankshaft 300; main shaft 310; secondary shaft 320; eccentric portion 330; transition portion 340; central oil hole 350; Upper mold 400; upper mold cavity 410; short shaft cavity 411; Lower mold 500; lower mold cavity 510; long axis cavity 511; transition cavity 512; eccentric axis cavity 513; Ejector rod 600. DETAILED DESCRIPTION

[0025] 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.

[0026] In the description of the present invention, it should be understood that descriptions involving orientation, such as orientation or positional relationship indicated as up, down, etc., are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying 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.

[0027] In the description of the present invention, "a plurality" means more than two. If there is a description of "first" or "second", it is only used for the purpose of distinguishing 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.

[0028] 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.

[0029] Refrigeration systems are installed in refrigeration equipment such as air conditioners and refrigerators to control the ambient temperature or the temperature inside the equipment. The refrigeration system includes components such as compressors, evaporators, condensers, and throttling devices. The compressor is the core component of the refrigeration system and is used to compress the refrigerant.

[0030] A rotary compressor generally includes a compressor body and a liquid reservoir. The compressor body includes a compressor housing, a pump assembly, a motor assembly and other structures. The pump assembly and the motor assembly are installed in the compressor housing. The motor assembly drives the crankshaft of the pump assembly to rotate. During the rotation of the crankshaft, the refrigerant entering the pump assembly is compressed.

[0031] The crankshaft is an important component of the compressor to achieve refrigerant compression. The crankshaft includes a main shaft, a secondary shaft and an eccentric part. Due to the existence of the eccentric part, the traditional crankshaft processing method is to use die casting or casting to complete the crankshaft casting, and then use turning, milling, drilling and other processing methods to complete the crankshaft rough processing. However, this processing method has a long process route, large processing allowance, long production cycle, and high energy consumption. In addition, die casting or casting is generally only applicable to materials such as cast iron, and it is difficult to apply to steel material processing.

[0032] Therefore, in the manufacturing process of the compressor, the traditional crankshaft processing method not only affects the production efficiency of the compressor, but also limits the processing materials of the crankshaft.

[0033] Reference Figure 1 As shown, in order to overcome the above problems, an embodiment of the present invention provides a method for manufacturing a crankshaft forging 200, comprising the following steps: S101: Cutting the crankshaft blank 100 from steel bar stock. The crankshaft blank 100 of this embodiment is obtained by cutting steel bar stock. Steel material has better strength and hardness, which is beneficial to increasing the service life of the crankshaft 300 and improving the fatigue strength of the crankshaft 300.

[0034] S102: Heating a local position of the first end 110 of the crankshaft blank 100. Before forging, the cut steel bar is locally heated. Figure 2 As shown, the first end 110 of the crankshaft blank 100 is locally heated, and the heated portion is smaller than the first end 110 of the crankshaft blank 100 along the height direction (i.e. Figure 2 The other positions of the crankshaft blank 100 do not need to be heated. In this embodiment, the heating temperature is 800°C to 1300°C, for example, 800°C, 900°C, 1000°C, 1200°C, 1300°C, etc.; the heating time is 5s to 8s, for example, 5s, 6s, 7s, 8s, etc. Compared with the traditional solution of heating the entire crankshaft blank 100, the heating time of the embodiment of the present invention can be effectively shortened, reducing energy consumption.

[0035] S103: Place the first end 110 of the heated crankshaft blank 100 upward in the lower mold cavity 510. After the crankshaft blank 100 is heated, place the heated end of the crankshaft blank 100 upward in the lower mold cavity 510 of the lower mold 500. Figure 2 and Figure 3 As shown, after the crankshaft blank 100 is placed in the lower mold cavity 510 , a portion of the heated portion of the crankshaft blank 100 is located in the lower mold cavity 510 , and a portion is located protruding from the lower mold cavity 510 , cooperating with the upper mold cavity 410 of the upper mold 400 .

[0036] S104: The upper die cavity 410 and the lower die cavity 510 are closed to forge the crankshaft forging 200. After the lower die 500 and the upper die 400 are closed, the upper die cavity 410 and the lower die cavity 510 are closed to forge the crankshaft forging 200. Figure 4 and Figure 5 2 is a structural diagram of a crankshaft forging 200. The crankshaft forging 200 includes a short shaft section 210, an eccentric shaft section 220, a transition section 230 and a long shaft section 240 from top to bottom. The short shaft section 210 and the eccentric shaft section 220 are forged from the heated portion of the crankshaft blank 100, and the long shaft section 240 is directly formed from the unheated portion of the crankshaft blank 100. In order to facilitate demolding of the crankshaft forging 200, the outer peripheral wall of the forged eccentric shaft section 220 has a first draft angle a, which is convenient for Figure 3 The push rod 600 in the crankshaft forging 200 is ejected.

[0037] The manufacturing method of the embodiment of the present invention only needs to locally heat the steel bar material, and then locally forge the eccentric portion 330 and the short shaft of the crankshaft 300 to obtain the crankshaft forging 200, and then manufacture it into a rough-processed product by turning, milling, drilling and other processing methods. The manufacturing method of the above embodiment can improve the processing efficiency of the crankshaft forging 200, improve the material utilization rate, reduce the processing difficulty, and the later processing allowance of the crankshaft forging 200 is small and the energy consumption is low. Therefore, the manufacturing method of the crankshaft forging 200 of the embodiment of the present invention is simple, has high forming efficiency, and a short processing cycle, and can achieve a processing allowance of 0.5mm to 2mm between the diameter of the steel bar material and the diameter of the finished crankshaft 300.

[0038] Reference Figure 6 As shown, the manufacturing method of the embodiment of the present invention also includes: S601: Process the eccentric shaft section 220 of the crankshaft forging 200 into a cylindrical shape. In order to facilitate demolding, the crankshaft forging 200 needs to be provided with a first draft angle a at the eccentric shaft section 220; and the eccentric portion 330 of the crankshaft 300 is sleeved with a roller, the inner ring of the roller is generally cylindrical, and the corresponding eccentric portion 330 also needs to be set to a cylindrical shape, so it is necessary to process the eccentric shaft section 220 of the crankshaft forging 200 into a cylindrical shape to cooperate with the roller. Step S601 generally adopts turning processing, and turning processing is performed after the crankshaft forging 200 is manufactured, and the processing process is simple and the processing amount is small.

[0039] Reference Figure 4 and Figure 5 As shown, in order to facilitate demoulding of the upper die 400 , the outer peripheral wall of the short shaft section 210 of the crankshaft forging 200 of the embodiment of the present invention has a second draft angle b.

[0040] Therefore, refer to Figure 7 As shown, the manufacturing method of the embodiment of the present invention also includes: S701: Process the short shaft section 210 of the crankshaft forging 200 into a cylindrical shape. That is, a second draft angle b is set at the short shaft section 210 of the crankshaft forging 200 after forging; and the secondary shaft 320 of the crankshaft 300 needs to cooperate with the flange of the pump body assembly, and the inner hole of the bearing part of the flange is generally cylindrical to cooperate with the secondary shaft 320 of the crankshaft 300. Step S701 generally adopts turning processing, and turning processing is performed after the crankshaft forging 200 is manufactured, and the processing process is simple and the processing amount is small.

[0041] Reference Figure 8 As shown, the embodiment of the present invention is formed by cutting the eccentric shaft segment 220 and the short shaft segment 210. Figure 8 The rough-machined crankshaft products shown, namely the eccentric shaft section 220 and the short shaft section 210 are both cylindrical.

[0042] Reference Figure 5 As shown, the outer peripheral wall of the eccentric shaft section 220 of the forged crankshaft forging 200 is inclined inward from top to bottom, and the outer peripheral wall of the short shaft section 210 is inclined outward from top to bottom. That is, the first draft angle a and the second draft angle b are inclined in opposite directions, the eccentric portion 330 is formed in the lower die cavity 510, and the short shaft section 210 is formed in the upper die cavity 410, so the demoulding efficiency of the upper die 400 and the lower die 500 can be improved.

[0043] Reference Figure 5As shown, the first draft angle a satisfies: 0°<a≤2°, for example, 0.5°, 1°, 1.5°, 2°, etc. The second draft angle b satisfies: a<b. The first draft angle a satisfies the above parameter range, which can ensure that the lower mold 500 is smoothly demolded while reducing the processing allowance in the later steps; and when the above parameter range is adopted, it has a higher yield rate and mold life, and has a better protection effect on the life of subsequent machining tools. The second draft angle b is greater than the first draft angle a, which makes it easier to demold the eccentric shaft segment 220, and ensures the rigidity of the contact section between the short shaft segment 210 and the eccentric shaft segment 220, and the short shaft segment 210 can leave enough processing allowance to ensure the circular runout and straightness of the crankshaft 300 processed later.

[0044] In the embodiment of the present invention, the second draft angle b satisfies: 0°<b≤3°, for example, 0.5°, 1°, 1.5°, 2°, 3°, etc.

[0045] Reference Figure 3 As shown, the lower die cavity 510 includes a long shaft cavity 511, a transition cavity 512 and an eccentric shaft cavity 513 from bottom to top. The long shaft cavity 511 is used to fit the long shaft section 240. The crankshaft blank 100 is clamped in the lower die 500, and the inner diameter of the long shaft cavity 511 completely fits the outer diameter of the crankshaft blank 100; therefore, it is not necessary to forge the long shaft section 240 of the crankshaft forging 200 during forging, and the long shaft section 240 has the same diameter as the steel bar stock, and the position of the crankshaft blank 100 corresponding to the long shaft section 240 does not need to be heated. The long shaft section 240 obtained by this processing step has a small processing allowance, and the long shaft section 240 after forging is no longer turned separately, which can reduce the subsequent processing steps, improve processing efficiency, and improve material utilization. The transition cavity 512 is used to extrude the transition section 230, and the eccentric shaft cavity 513 is used to extrude the eccentric shaft section 220. The design of the transition cavity 512 can improve the forming ability of the eccentric shaft section 220. The upper die cavity 410 includes a short shaft cavity 411, and the short shaft cavity 411 is used to extrude the short shaft section 210. The design of the short shaft cavity 411 facilitates the control of the second draft angle b of the short shaft section 210 and facilitates demolding. During the forging process, the lower die 500 presses the upper die 400 from bottom to top to press out the short shaft section 210 and the eccentric shaft section 220.

[0046] Reference Fig. 9 As shown, heating a local position of the first end 110 of the crankshaft blank 100 includes: S901: The position of the crankshaft blank 100 corresponding to the transition section 230, the eccentric shaft section 220 and the short shaft section 210 is heated. Therefore, only a local position of the crankshaft blank 100 needs to be heated, and then the heated part is forged to forge the transition section 230, the eccentric shaft section 220 and the short shaft section 210. The position of the crankshaft blank 100 corresponding to the long shaft section 240 is not heated. However, the long shaft section 240 close to the heating position may obtain heat due to the outward diffusion of the heated shaft section, and the manufacturing method of this embodiment does not block the diffusion heat transfer.

[0047] The embodiment of the present invention does not need to heat the position of the crankshaft blank 100 corresponding to the long shaft section 240, which reduces energy consumption, reduces processing volume, and increases mold life.

[0048] Reference Figure 5 As shown, in the crankshaft forging 200 of the embodiment of the present invention, in the vertical direction, the total length of the crankshaft forging 200 is L, the length of the short shaft section 210 is L0, the length of the eccentric shaft section 220 is L1, and the length of the transition section 230 is L2, which satisfies: L / 3<(L0+L1+L2)<L / 2. When the above parameter range is met, the forging process of the crankshaft forging 200 can be achieved under local heating.

[0049] In the embodiment of the present invention, the length L2 of the transition section 230 satisfies: L2≤10 mm. When the above parameter range is met, the transition section 230 can improve the forming ability of the eccentric shaft section 220 and facilitate demoulding of the crankshaft forging 200.

[0050] Reference Fig.10 As shown, the manufacturing method of the embodiment of the present invention also includes: S1001: Drilling the crankshaft forging 200. The purpose of drilling is to machine the center oil hole 350 of the crankshaft 300, and the center oil hole 350 penetrates the entire crankshaft 300 along the axial direction of the crankshaft 300. As another embodiment, the drilling process also includes machining an oil outlet hole connected to the center oil hole 350, and the oil outlet hole is used to lubricate the crankshaft 300. Step S1001 can be performed after the crankshaft forging 200 is demolded, that is, after step S104, or it can be performed after the crankshaft forging 200 is cut, for example, after step S601 or step S701, which is not specifically limited here.

[0051] Reference Figure 4 and Figure 5As shown, a crankshaft forging 200 according to an embodiment of the present invention comprises: a short shaft section 210, an eccentric shaft section 220, a transition section 230 and a long shaft section 240. The short shaft section 210, the eccentric shaft section 220, the transition section 230 and the long shaft section 240 are arranged in sequence from top to bottom, the outer peripheral wall of the eccentric shaft section 220 has a first draft angle a, and the outer peripheral wall of the short shaft section 210 has a second draft angle b. The long shaft section 240 of the crankshaft forging 200 does not need to participate in the forging process, the machining allowance is small, and no turning process is required in the subsequent process. The subsequent turning process amount of the short shaft section 210 and the eccentric shaft section 220 is small, which is conducive to improving the machining efficiency.

[0052] It can be understood that the outer peripheral wall of the eccentric shaft section 220 of the crankshaft forging 200 is inclined inward from top to bottom, and the outer peripheral wall of the short shaft section 210 is inclined outward from top to bottom. The first draft angle a and the second draft angle b are inclined in opposite directions, the eccentric portion 330 is correspondingly formed in the lower die cavity 510, and the short shaft section 210 is correspondingly formed in the upper die cavity 410, so that the crankshaft forging 200 can be separated at the connection between the eccentric portion 330 and the short shaft section 210, and the demolding efficiency of the upper die 400 and the lower die 500 can be improved.

[0053] It is understandable that the first draft angle a satisfies: 0°<a≤2°, and the second draft angle b satisfies: a<b. The first draft angle a satisfies the above parameter range, which can ensure that the lower mold 500 is smoothly demolded while reducing the processing allowance in the later steps; and when the above parameter range is adopted, it has a higher yield rate and mold life, and has a better protection effect on the life of subsequent machining tools. The second draft angle b is greater than the first draft angle a, which makes it easier to demold the eccentric shaft segment 220, and ensures the rigidity of the contact section between the short shaft segment 210 and the eccentric shaft segment 220, and the short shaft segment 210 can leave enough processing allowance to ensure the circular runout and straightness of the crankshaft 300 processed later.

[0054] Since the crankshaft forging 200 of the embodiment of the present invention adopts all the technical solutions of the crankshaft forging 200 manufacturing method of the above embodiment, it has at least all the beneficial effects brought by the technical solutions of the above embodiment, which will not be repeated here.

[0055] A crankshaft 300 according to an embodiment of the present invention is manufactured according to the manufacturing method of the crankshaft forging 200 of the above-mentioned embodiment. By adopting the manufacturing method of the crankshaft forging 200 of the first embodiment, the processing efficiency of the crankshaft 300 is high and the processing cost is low. Moreover, the crankshaft forging 200 made of steel material has higher structural strength, better surface hardness, and longer service life, thereby improving the stability and service life of the compressor.

[0056] The crankshaft 300 of the embodiment of the present invention is manufactured by using the crankshaft forging 200 of the above embodiment, and therefore has at least all the beneficial effects brought by the technical solutions of the above embodiment, which will not be described in detail here.

[0057] Reference Fig.11 and Fig.12 As shown, it can be understood that the crankshaft 300 of the embodiment of the present invention includes a main shaft 310, a secondary shaft 320, an eccentric portion 330 and a transition portion 340, and the eccentric portion 330 is located between the main shaft 310 and the secondary shaft 320. The crankshaft 300 of this embodiment includes an eccentric portion 330 and is applied to a single-cylinder rotary compressor. Define the outer diameter Φ3 of the main shaft 310, the outer diameter Φ0 of the secondary shaft 320, the outer diameter Φ1 of the eccentric portion 330, the maximum outer diameter Φ2 of the transition portion 340, the inner diameter Φ4 of the center oil hole 350, the length L3 of the eccentric portion 330, the length L4 of the secondary shaft 320, and the eccentricity e of the crankshaft 300, which meet the following requirements: Φ1≤2*Φ0; Φ2≤Φ1; Φ4≤0.5*Φ0; L3≤Φ1; (Φ1-Φ0)*L4≤(Φ1-Φ3)*L3; e≤0.5*Φ0. Specifically, the outer diameter of the eccentric portion 330 is less than or equal to twice the outer diameter of the secondary shaft 320; the maximum outer diameter Φ2 of the transition portion 340 is less than or equal to the outer diameter Φ1 of the eccentric portion 330; the inner diameter Φ4 of the central oil hole 350 is less than or equal to half of the outer diameter Φ0 of the secondary shaft 320; the length L3 of the eccentric portion 330 is less than or equal to the outer diameter Φ1 of the eccentric portion 330; the difference between the outer diameter Φ1 of the eccentric portion 330 and the outer diameter Φ0 of the secondary shaft 320 multiplied by the length L4 of the secondary shaft 320 is less than or equal to the difference between the outer diameter Φ1 of the eccentric portion 330 and the outer diameter Φ3 of the main shaft 310 multiplied by the length L3 of the eccentric portion 330; the eccentricity e of the crankshaft 300 is less than or equal to half of the outer diameter Φ0 of the secondary shaft 320. The crankshaft 300 that meets the above parameter limitations can obtain better performance parameters under the parameters of the eccentricity.

[0058] A compressor according to an embodiment of the present invention comprises the crankshaft 300 of the above embodiment, and the compressor may be a rotary compressor, a scroll compressor, etc., which is not specifically limited here. The compressor according to the embodiment of the present invention adopts the crankshaft 300 of the above embodiment, so that the production efficiency of the compressor is high and the production cost is low.

[0059] Since the compressor of the embodiment of the present invention adopts all the technical solutions of the crankshaft 300 of the above embodiment, it has at least all the beneficial effects brought by the technical solutions of the above embodiment, which will not be repeated here.

[0060] 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. Manufacturing method of crankshaft forgings, It is characterized in that The following steps are involved: Crankshaft blanks are cut from steel bars; heating a localized position of the first end of the crankshaft blank; placing the heated crankshaft blank with the first end facing upward in the lower die cavity; The upper die cavity and the lower die cavity are closed to forge a crankshaft forging; The crankshaft forging includes a short shaft section, an eccentric shaft section, a transition section and a long shaft section from top to bottom, and the outer peripheral wall of the eccentric shaft section has a first draft angle.

2. The method for manufacturing a crankshaft forging according to claim 1, It is characterized in that Also includes: The eccentric shaft section of the crankshaft forging is processed into a cylindrical shape.

3. The method for manufacturing a crankshaft forging according to claim 1 or 2, Features: The outer peripheral wall of the short shaft section has a second draft angle, and the manufacturing method of the crankshaft forging also includes: The short shaft section of the crankshaft forging is processed into a cylindrical shape.

4. The method for manufacturing a crankshaft forging according to claim 3, Features: The outer peripheral wall of the eccentric shaft section is inclined inward from top to bottom, and the outer peripheral wall of the short shaft section is inclined outward from top to bottom.

5. The method for manufacturing a crankshaft forging according to claim 3, Features: The first draft angle a satisfies: 0°<a≤2°, and the second draft angle b satisfies: a<b.

6. The method for manufacturing a crankshaft forging according to claim 1, Features: The method of heating a local position of the first end of the crankshaft blank comprises: The positions of the crankshaft blank corresponding to the transition section, the eccentric shaft section and the short shaft section are heated.

7. The method for manufacturing a crankshaft forging according to claim 1, Features: The total length L of the crankshaft forging, the length L of the short shaft section 0 , the length L of the eccentric shaft segment 1 and the length L of the transition section 2 Satisfy: L / 3<(L 0 +L 1 +L 2 )<L / 2.

8. The method for manufacturing a crankshaft forging according to claim 1, Features: The lower die cavity comprises a long shaft cavity, a transition cavity and an eccentric shaft cavity, wherein the long shaft cavity is used to fit the long shaft segment, the transition cavity is used to extrude the transition segment, and the eccentric shaft cavity is used to extrude the eccentric shaft segment; The upper die cavity comprises a short shaft cavity, and the short shaft cavity is used to extrude the short shaft segment.

9. Crankshaft forgings, It is characterized in that include: A short shaft section, an eccentric shaft section, a transition section and a long shaft section, wherein the short shaft section, the eccentric shaft section, the transition section and the long shaft section are arranged in sequence from top to bottom, and an outer peripheral wall of the eccentric shaft section has a first draft angle.

10. The crankshaft forging according to claim 9, Features: The outer peripheral wall of the short shaft section has a second draft angle; the outer peripheral wall of the eccentric shaft section is inclined inward from top to bottom, and the outer peripheral wall of the short shaft section is inclined outward from top to bottom.

11. The crankshaft forging according to claim 9, Features: The outer peripheral wall of the short axis segment has a second draft angle; the first draft angle a satisfies: 0°<a≤2°, and the second draft angle b satisfies: a<b.

12. The crankshaft forging according to any one of claims 9 to 11, Features: The total length L of the crankshaft forging, the length L of the short shaft section 0 , the length L of the eccentric shaft segment 1 and the length L of the transition section 2 Satisfy: L / 3<(L 0 +L 1 +L 2 )<L / 2.

13. Crankshaft, Features: The crankshaft is made of the crankshaft forging described in any one of claims 9 to 12.

14. The crankshaft according to claim 13, Features: The crankshaft includes a main shaft, a secondary shaft, an eccentric portion and a transition portion. The outer diameter of the main shaft is Φ 3 、Outer diameter of countershaft Φ 0 、Outer diameter of eccentric part Φ 1 、The maximum outer diameter of the transition part Φ 2 , the inner diameter of the center oil hole Φ 4 , the length L of the eccentric portion 3 , the length of the secondary axis is L 4 , the eccentricity e of the crankshaft satisfies: F 1 ≤2*Φ 0 ;F 2 ≤Φ 1 ;F 4 ≤0.5*Φ 0 ;L 3 ≤Φ 1 ;(F 1 -F 0 )*L 4 ≤(Φ 1 -F 3 )*L 3 ;e≤0.5*Φ 0 。 15. Compressor, Features: Including the crankshaft described in claim 13 or 14.

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