Machining method of spring collar for aero-engine and winding forming equipment

Abstract

The invention relates to the technical field of spring collar machining, in particular to a machining method of a spring collar for an aero-engine and winding forming equipment, and aims to calculate key parameters of a round wire according to the size and tensile strength of a flat wire to be obtained, so that the machining efficiency and the machining precision are improved. According to the method, the size and tensile strength of the ideal round wire can be obtained through the two relational expressions, so that material selection can be more accurate, the machining precision and machining efficiency can be greatly improved, and the method is more reliable.

Description

Technical Field

[0001] The invention relates to the technical field of spring retaining ring processing, and in particular to a processing method and winding forming equipment for a spring retaining ring used for an aero-engine. Background Art

[0002] A spring retaining ring is a mechanical part, usually composed of an outer retaining ring, an inner retaining ring and several raised claws, and is mainly used to fix the axial position. In the prior art, the retaining ring is generally a single-layer open structure in the form of a wire or thin sheet, and is processed by stamping and turning processes; with the development of technology, new spiral spring retaining rings are gradually being used; and for spiral retaining rings, the process method is improved by using strips and wire blanks and winding them with a spring winding machine. However, this method has low accuracy for round wires that want to obtain ideal flat wire size and tensile strength, which makes it impossible to improve the yield rate of spring retaining rings during processing. Summary of the invention

[0003] 1. Technical issues to be resolved In order to solve the above problems, the present invention proposes a processing method and winding forming equipment for a spring retaining ring for an aircraft engine, aiming to solve the problem in the prior art that the precision of round wires for obtaining ideal flat wire size and tensile strength is low, and the yield rate of spring retaining rings cannot be improved during processing.

[0004] (II) Technical solution A method for processing a spring retaining ring for an aero-engine of the present invention comprises the following steps: S100, selecting a wire, establishing an idealized model according to the pre-processed size of the spring, obtaining an ideal size and an ideal tensile strength of the round wire, generating an ideal wire standard, and obtaining an ideal round wire; S200, round wire flattening, cold rolling the ideal round wire into a flat wire; S300, winding and forming, processing the flat wire obtained in step S200 into a spring retaining ring through a forming device; The step S100 also includes sub-step S101 and sub-step S102, wherein: S101, determining the size of the round wire, and calculating the diameter of the round wire according to the required flat wire diameter; S102, determining the tensile strength of the round wire, and calculating the tensile strength of the flat wire based on the tensile strength of the round wire to select a suitable round wire.

[0005] In the present invention, the order of sub-step S101 and sub-step S102 is replaced.

[0006] In the present invention, the ideal size includes the diameter of the round wire. ,radius , wherein the ideal size and the size of the flat wire after cold rolling satisfy the relationship: ,in is the correction factor, is the width of the flat wire, is the thickness of the flat wire; The ideal size and the tensile strength of the cold-rolled flat wire satisfy the relationship: ,in is the tensile strength of the flat wire after cold rolling, is the range of tensile strength improvement of the ideal round wire after flattening, is the tensile strength of an ideal round wire.

[0007] In the present invention, the correction coefficient k ranges from 1.2 to 1.6.

[0008] Another winding and forming device of the present invention is used in step S300 described in the above technical solution to wind the cold-rolled flat wire into a spring retaining ring, and the winding and forming device includes: A wire feeding pressure wheel, wherein the wire feeding pressure wheel comprises at least two wire feeding wheels, a wire feeding channel for the flat wire to pass through is formed between the two wire feeding wheels, and a first power member for driving the wire feeding wheel to rotate is provided at one end of the wire feeding wheel; Equipment body; A mandrel, fixedly disposed in the device body, one end of which passes through the device body and extends into the wire feeding channel, and the other end of which is located at the other side of the device body and connected to the wire gauge assembly, wherein a first slot hole is provided in the mandrel for the flat wire to pass through; A wire gauge assembly, including an inner curve gauge and an outer curve gauge, wherein the outer curve gauge is connected to the mandrel and used to wind the flat wire into a circle and preliminarily determine the inner and outer diameters of the retaining ring, and the inner curve gauge is connected to the other side where the outer curve gauge is connected to the mandrel and used to wind the braided wire into a true circle and ensure the stability of the inner and outer diameters of the spiral retaining ring; An offset die is located above the mandrel and the wire gauge assembly, and is used to receive the flat wire delivered from the wire gauge assembly and punch the flat wire to form an offset, thereby ensuring the consistency of the overall thickness of the product; The upper and lower disassembly die assemblies are arranged at the end of the winding forming equipment and are used to cut the flat wire after the spiral retaining ring is wound, so that the spiral retaining ring forms a double-sector incision.

[0009] In the present invention, the number of the wire feeding pressure wheels is two, and a wire guide plate is provided between the two wire feeding pressure wheels. The wire guide plate is provided with a second slot hole for calibrating the conveying directions of the two wire feeding pressure wheels.

[0010] In the present invention, a second power member for driving the first power member to move up and down is further provided at one end of the wire feeding wheel.

[0011] In the present invention, the wire feeding pressure wheel, the core rod, the wire gauge assembly, the offset die, and the upper and lower disassembly die assemblies are connected end to end in sequence, the wire feeding pressure wheel and the core rod are made of white steel, and the wire gauge assembly is made of tungsten steel.

[0012] (III) Beneficial effects Compared with the prior art, the present invention has the following beneficial effects: In the present invention, the size and tensile strength of the ideal round wire can be obtained through two relationship equations, so that the material selection can be more accurate and the processing accuracy and processing efficiency can be greatly improved, which is more reliable.

[0013] In the present invention, by obtaining the parameters and mechanical performance parameters of the ideal round wire, the processing process can be simulated and practiced through software, thereby further improving the processing accuracy and reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in 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.

[0015] Figure 1 The figure is a schematic diagram of the processing steps of the spring retaining ring; Figure 2 A schematic diagram of the sub-step process for selecting wire material; Figure 3 A schematic diagram of the sub-step process for selecting wire (exchange order); Figure 4 Schematic diagram of the module structure of the winding forming equipment.

[0016] 1. Wire feeding pressure wheel, 11. Wire feeding wheel, 12. Wire feeding channel, 13. First power member, 14. Wire guide plate, 15. Second slot hole, 16. Second power member, 2. Equipment body, 3. Mandrel, 31. First slot hole, 4. Wire gauge assembly, 41. Inner curve gauge, 42. Outer curve gauge, 5. Offset mold, 6. Upper and lower disassembly die assembly, 61. Upper die, 62. Lower die. DETAILED DESCRIPTION

[0017] Example 1

[0018] like Figure 1-Figure 2A processing method for a spring retaining ring for an aircraft engine is shown. In the present invention, the processing method aims to deduce the key parameters of the round wire according to the size and tensile strength of the desired flat wire, thereby improving the processing efficiency and processing accuracy. The processing method comprises the following steps: S100, selecting wires, establishing an idealized model according to the pre-processed dimensions of the spring, obtaining the ideal dimensions and ideal tensile strength of the round wires, and selecting round wires that meet the standards; Through multiple investigations, we collected and analyzed the flattening data of various round wire materials, calculated the theoretical value of the wire after flattening, and conducted processing drills through three-dimensional models to further improve processing accuracy and reduce error rates.

[0019] S200, processing round wire into flat wire, cold rolling the round wire into flat wire through a rolling wheel; Compared with the hot processing used in the prior art, in which the wire is heated and then flattened or wound, cold rolling has higher requirements for the tensile strength of the material and will not cause oxidation or reduction in hardness of the material during the processing. It has fewer process steps and is more efficient.

[0020] S300, winding and forming, processing the flat wire obtained in step S200 into a spring retaining ring through a forming device; Specifically, the step S100 further includes sub-step S101 and sub-step S102, wherein: S101, determine the size of the round wire, by the formula Calculate the diameter of the ideal wire, where the diameter of the round wire is d, the radius is r, the width of the flat wire is b, the thickness is t, and k is the correction factor; S102, determine the tensile strength of round wire, by formula Calculate the theoretical tensile strength of the round wire after flattening, where the tensile strength of the flat wire is , the tensile strength of round wire after flattening is increased in the range of , the tensile strength of round wire is . Deformation rate of flat wire Regarding the deformation rate When below 35%, Strength increased by 250-400Mpa; deformation rate Above 35%, Strength increased by 400-550Mpa; ,in is the cross-sectional area of ​​an ideal round wire, is the cross-sectional area of ​​the flat wire.

[0021] In particular, the order of steps S101 and S102 can be interchanged at will, that is, these two steps are intended to determine the size and tensile strength of the wire material so as to simulate the processing process and improve the processing accuracy and success rate.

[0022] In step S101, when the required width is 6.5 (+0.15, 0) mm and the thickness is 0.9 (0, -0.08) mm, an idealized model is first established, assuming that the diameter of the round wire is d and the radius is r; the width of the flat wire is b and the thickness is t; and under the premise that the cross section of the round wire remains unchanged before and after flattening, Substituting into the formula, we get the radius of the ideal circle r=1.365mm and the ideal diameter d=2.73mm.

[0023] Since there is an error between the theoretical value and the actual value, in order to improve the accuracy of the round wire size, the present invention introduces a correction coefficient k, that is, , where the value of the correction coefficient k is related to the material of the wire. In this embodiment, the material GH4169 round wire is used, and its correction coefficient k is about 1.25. Substituting it into the above formula, the ideal round wire diameter d=3.4mm is obtained.

[0024] The correction factor k directly affects the selection of the original diameter, thereby determining the accuracy of the flat wire size. The correction factor k in this processing method is obtained through a large number of experiments, and is mainly related to the mechanical properties of the round wire, such as elongation, compressibility, bendability, etc. In this embodiment, the value range of k is 1.2-1.6.

[0025] In step S102, the tensile strength of the known product flat wire is After a large amount of data analysis, the tensile strength range of the round wire after flattening is obtained It is about 400Mpa.

[0026] Assume the tensile strength of the round wire is , then substitute into the formula to get the theoretical value 700-900Mpa, the tensile strength of raw materials incoming inspection is 896 / 898Mpa; the tensile strength of the flat wire after flattening is , in line with product technical requirements.

[0027] Furthermore, during cold rolling, the process parameters satisfy the following table:

[0028] After the flat wire is manufactured through the above steps, the flat wire is wound into a spring retaining ring through a winding device.

[0029] Example 2

[0030] Reference Figure 4The present invention also discloses a winding and forming device for winding a cold-rolled flat wire into a spring retaining ring, and the winding and forming device comprises: The winding and forming equipment mainly includes a wire feeding pressure wheel 1, an equipment body 2, a core rod 3, a wire gauge assembly 4, an offset die 5, and an upper and lower disassembly die assembly 6.

[0031] The wire feeding roller 1 is the starting part of the equipment, which is responsible for accurately feeding the flat wire into the subsequent processing link. Specifically, the wire feeding roller 1 includes at least two wire feeding rollers 11, and a wire feeding channel 12 for the flat wire to pass through is formed between the two wire feeding rollers 11. A first power member 13, such as a motor or a pneumatic motor, is provided at one end of the wire feeding roller 11 for driving its rotation to ensure the stability and continuity of the wire feeding process.

[0032] In a preferred embodiment, there are two wire feeding rollers 1, and a guide plate 14 is provided between the two wire feeding rollers 1. The guide plate 14 is provided with a second slot 15, which is used to calibrate the conveying direction of the two wire feeding rollers 1 to ensure that the flat wire can enter the wire feeding channel 12 accurately.

[0033] In order to further improve the flexibility and adaptability of wire feeding, a second power member 16 for driving the first power member 13 to move up and down is further provided at one end of the wire feeding wheel 11. In this way, the height of the wire feeding wheel 11 can be adjusted according to actual needs to adapt to flat wires of different specifications and thicknesses. In particular, the second power member can also be an electric motor or a pneumatic motor.

[0034] The equipment body 2 is the supporting structure of the winding forming equipment, which is fixedly arranged in the processing area to provide a stable installation platform for other components.

[0035] The mandrel 3 is a key component in the winding process, and is fixedly arranged in the equipment body 2. One end of the mandrel 3 passes through the equipment body 2 and extends into the wire feeding channel 12, which is used to receive the flat wire sent from the wire feeding pressure wheel 1. A first slot 31 is provided in the mandrel 3 for the flat wire to pass through, and the shape and size of the slot match the flat wire to ensure the smooth progress of the winding process.

[0036] The wire gauge assembly 4 includes an inner curve gauge 41 and an outer curve gauge 42. The outer curve gauge 42 is connected to the mandrel 3 and is used to wind the flat wire into a circle and preliminarily determine the inner and outer diameters of the retaining ring. The inner curve gauge 41 is connected to the other side of the outer curve gauge 42 connected to the mandrel 3 and is used to further wind the flat wire into a true circle to ensure the stability of the inner and outer diameters of the spiral retaining ring. The material of the wire gauge assembly 4 is preferably tungsten steel to improve its wear resistance and service life.

[0037] The offset die 5 is located above the mandrel 3 and the wire gauge assembly 4, and is used to receive the flat wire delivered from the wire gauge assembly 4. The offset die 5 forms an offset on the stamped flat wire, which is crucial to ensure the consistency of the overall thickness of the product. Through the precise control of the offset die 5, it can be ensured that the thickness of each spiral retaining ring meets the design requirements.

[0038] The upper and lower disassembly die assembly 6 is arranged at the end of the winding forming device, and is used to cut off the flat wire after the spiral retaining ring is wound. Specifically, the upper and lower disassembly die assembly 6 includes an upper die 61 and a lower die 62 (such as Figure 4 As shown in the figure, they work together to form a double-sector cut on the spiral retaining ring, which is convenient for subsequent processing and use.

[0039] The wire feeding pressure wheel 1, the core rod 3, the wire gauge assembly 4, the offset die 5, and the upper and lower disassembly die assembly 6 are connected end to end in sequence to form a complete winding and forming production line. Among them, the material of the wire feeding pressure wheel 1 and the core rod 3 is preferably white steel, which has good wear resistance and corrosion resistance and can ensure the long-term stable operation of the equipment. In particular, the wire feeding pressure wheel 1, the equipment body 2, the core rod 3, the wire gauge assembly 4, the offset die 5, and the upper and lower disassembly die assembly 6 are all prior art. This scheme changes their specific materials and makes adaptive adjustments to meet the design requirements of this scheme.

[0040] The above-described embodiments are merely descriptions of preferred implementations of the present invention, and are not intended to limit the concept and scope of the present invention. Without departing from the design concept of the present invention, various modifications and improvements made by ordinary persons in the art to the technical solution of the present invention should fall within the protection scope of the present invention, and the technical contents for which protection is sought in the present invention have been fully recorded in the claims.

Claims

1. A method for processing a spring retaining ring for an aircraft engine, characterized in that: The processing method comprises the following steps: S100, selecting a wire, establishing an idealized model according to the pre-processed size of the spring, obtaining an ideal size and an ideal tensile strength of the round wire, generating an ideal wire standard, and obtaining an ideal round wire; S200, round wire flattening, cold rolling the ideal round wire into a flat wire; S300, winding and forming, processing the flat wire obtained in step S200 into a spring retaining ring through a forming device; The step S100 also includes sub-step S101 and sub-step S102, wherein: S101, determining the size of the round wire, and calculating the diameter of the round wire according to the required flat wire diameter; S102, determining the tensile strength of the round wire, and calculating the tensile strength of the flat wire based on the tensile strength of the round wire to select a suitable round wire.

2. The method for processing a spring retaining ring for an aircraft engine according to claim 1, characterized in that: The order of the sub-step S101 and the sub-step S102 is replaced.

3. The method for processing a spring retaining ring for an aircraft engine according to claim 2, characterized in that: The ideal dimensions include the diameter of the round wire ,radius , wherein the ideal size and the size of the flat wire after cold rolling satisfy the relationship: ,in is the correction factor, is the width of the flat wire, is the thickness of the flat wire; The ideal size and the tensile strength of the cold-rolled flat wire satisfy the relationship: ,in is the tensile strength of the flat wire after cold rolling, is the range of tensile strength improvement of the ideal round wire after flattening, is the tensile strength of an ideal round wire.

4. The method for processing a spring retaining ring for an aircraft engine according to claim 3, characterized in that: The correction coefficient k ranges from 1.2 to 1.

6.

5. The method for processing a spring retaining ring for an aircraft engine according to claim 4, characterized in that: The range of tensile strength improvement of the ideal round wire after flattening and deformation rate Related to and satisfying the relation ,in is the cross-sectional area of ​​an ideal round wire, is the cross-sectional area of ​​the flat wire; Deformation rate When below 35%, Strength increased by 250-400Mpa; deformation rate When it is above 35%, Strength increased by 400-550Mpa.

6. A winding forming device, characterized in that: The winding and forming equipment is used in step S300 described in any one of claims 1 to 5, and is used to wind the cold-rolled flat wire into a spring retaining ring, and the winding and forming equipment includes: A wire feeding pressure wheel, wherein the wire feeding pressure wheel comprises at least two wire feeding wheels, a wire feeding channel for the flat wire to pass through is formed between the two wire feeding wheels, and a first power member for driving the wire feeding wheel to rotate is provided at one end of the wire feeding wheel; Equipment body; A mandrel, fixedly disposed in the device body, one end of which passes through the device body and extends into the wire feeding channel, and the other end of which is located at the other side of the device body and connected to the wire gauge assembly, wherein a first slot hole is provided in the mandrel for the flat wire to pass through; A wire gauge assembly, including an inner curve gauge and an outer curve gauge, wherein the outer curve gauge is connected to the mandrel and used to wind the flat wire into a circle and preliminarily determine the inner and outer diameters of the retaining ring, and the inner curve gauge is connected to the other side where the outer curve gauge is connected to the mandrel and used to wind the braided wire into a true circle and ensure the stability of the inner and outer diameters of the spiral retaining ring; An offset die is located above the mandrel and the wire gauge assembly, and is used to receive the flat wire delivered from the wire gauge assembly and punch the flat wire to form an offset, thereby ensuring the consistency of the overall thickness of the product; The upper and lower disassembly die assemblies are arranged at the end of the winding forming equipment and are used to cut the flat wire after the spiral retaining ring is wound, so that the spiral retaining ring forms a double-sector incision.

7. The winding forming equipment according to claim 6, characterized in that: The number of the wire feeding pressure wheels is two, and a guide wire plate is provided between the two wire feeding pressure wheels. The guide wire plate is provided with a second slot hole for calibrating the conveying directions of the two wire feeding pressure wheels.

8. The winding forming equipment according to claim 6 or 7, characterized in that: A second power member is also provided at one end of the wire feeding wheel for driving the first power member to move up and down.

9. The winding forming equipment according to claim 8, characterized in that: The wire feeding pressure wheel, the core rod, the wire gauge assembly, the offset die, and the upper and lower disassembly die assemblies are connected end to end in sequence. The wire feeding pressure wheel and the core rod are made of white steel, and the wire gauge assembly is made of tungsten steel.

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