Heat treatment method of copper alloy plate part

Abstract

The invention discloses a heat treatment method of a copper alloy plate part, which comprises the following steps of: cleaning the copper alloy plate part, a heat treatment box and a material rack, drying, vertically suspending the part and placing the part in a barrier of the material rack at intervals, placing the part and the material rack in a box body of the heat treatment box, covering a box cover, and placing filler in an annular box groove at the periphery of the box cover, charcoal is further placed in the heat treatment box, after solution treatment is carried out, the material frame containing the parts is taken out and integrally placed in water to be cooled and blow-dried, the parts are vertically hung and placed in barriers of the material frame at intervals, the parts and the material frame are placed in a box body of the heat treatment box again, the box cover is covered, filler is placed in an annular box groove in the periphery of the box cover, and the heat treatment box is formed. And after aging treatment is executed, the whole material frame containing the parts is taken out and cooled in air, the material frame is hoisted out after cooling, and the parts are unloaded after cooling. According to the technical scheme, the problems that in an existing copper alloy treatment mode, atmosphere protection heat treatment is low in production efficiency and narrow in applicability, and vacuum heat treatment is complex in control and low in production efficiency are solved.

Description

Technical Field

[0001] The present invention relates to, but is not limited to, the technical field of heat treatment of nonferrous metals, and specifically to the technical field of treatment of copper alloy sheet parts used in aviation DC generators, and in particular to a heat treatment method for copper alloy sheet parts. Background Art

[0002] Copper alloys are divided into brass, bronze and nickel silver, etc., and have two strengthening mechanisms: non-heat-treatable strengthening and heat-treatable strengthening. Among them, heat-treatable strengthening copper alloy is a common material for rotor end plate parts used in aviation DC generators. Its performance index requires the maximum strength of the material, which requires heat treatment to ensure its optimal performance.

[0003] At present, the conventional methods of solid solution + aging heat treatment to prevent copper alloy oxidation are atmosphere protection heat treatment and vacuum heat treatment; among them, the atmosphere protection heat treatment method has strict requirements on the type and concentration of atmosphere. Different copper alloys are suitable for different atmospheres. It is necessary to rely on the control of process parameters (including the type, flow rate, concentration, etc. of the gas filled) during the atmosphere protection process to ensure it. The production efficiency is low and it is not suitable for atmosphere protection heat treatment of different types of copper alloys. In addition, although the vacuum heat treatment method can effectively prevent the oxidation of copper alloys at high temperatures, some metal elements of copper alloys will easily volatilize when heated in a high vacuum, resulting in changes in the strength, ductility and other properties of the copper alloy, prompting the vacuum heat treatment of copper alloys to be processed only with low vacuum or backfilling inert gas protection. This method is complex to control, has low production efficiency, and requires high equipment capabilities. Summary of the invention

[0004] Purpose of the present invention: In order to solve the above-mentioned technical problems, an embodiment of the present invention provides a heat treatment method for copper alloy plate parts to solve the problems of low production efficiency and narrow applicability in existing copper alloy processing methods through atmosphere protection heat treatment, and complex control and low production efficiency in vacuum heat treatment.

[0005] Technical solution of the present invention: An embodiment of the present invention provides a method for heat treatment of copper alloy sheet parts, comprising:

[0006] Step 1, clean the copper alloy sheet parts, heat treatment box and material rack, and blow dry them with compressed air;

[0007] Step 2, vertically hang at least one copper alloy sheet part in the partition of the material rack, with the interval between adjacent parts being at least 10 mm;

[0008] Step 3, placing the rack with parts in the heat treatment box, closing the box cover, and placing fillers in the annular box groove around the box cover until the height of the fillers is substantially flush with the upper edge of the annular box groove; charcoal is also placed in the heat treatment box;

[0009] Step 4, solution treatment, comprising: placing a heat treatment box containing parts and a material rack in an air furnace for solution treatment, wherein the heating temperature and holding time in the solution treatment are determined according to the material of the parts;

[0010] Step 5, open the box cover, take out the rack with parts and put it into water for cooling. After cooling, lift out the rack, remove the parts and use compressed air to dry the parts;

[0011] Step 6, hang the copper alloy sheet parts that have been dried after solution treatment vertically in the partitions of the material rack, with the interval between adjacent parts being at least 10 mm;

[0012] Step 7, put the rack with parts into the box body of the heat treatment box, cover the box cover, and place fillers in the annular box groove around the box cover until the height of the fillers is basically flush with the upper edge of the annular box groove;

[0013] Step 8, aging treatment, including: placing the heat treatment box containing the parts and the material rack in an air furnace for aging treatment, and the heating temperature and holding time in the aging treatment are determined according to the material of the parts;

[0014] Step 9, open the box cover, take out the rack containing parts and cool it in the air as a whole. After cooling, lift out the rack and remove the parts after cooling.

[0015] Optionally, in the heat treatment method of the copper alloy sheet part as described above,

[0016] The material rack 4 is configured as a columnar frame structure, and the material rack 4 includes a rack bottom and a rack top arranged in parallel, and pillars connected between the rack bottom and the rack top, and a plurality of fences are arranged in parallel on the rack top, which are used to vertically place the copper alloy sheet parts into the material rack and separate them by the fences;

[0017] The size of the material rack 4 is set as follows: after the bottom of the material rack 4 is placed in the heat treatment box, the other structures of the material rack 4 except the bottom of the material rack 4 are at least 50 mm away from the inner wall of the tube of the heat treatment box.

[0018] Optionally, in the heat treatment method for copper alloy sheet parts as described above, the heat treatment box includes: a cylindrical box body 1 with an opening at one end and a box cover 2, the outer side of the open end of the cylindrical box body 1 extends a circle of outer cylinder wall 3 along the circumference of the cylinder wall, and the bottom end surface of the outer cylinder wall 3 is connected to the upper part of the cylinder wall to form an annular box groove 3a between the open end of the cylinder wall and the outer cylinder wall.

[0019] Optionally, in the heat treatment method of the copper alloy sheet part as described above,

[0020] In step 4, the heat treatment box containing the charcoal, parts and racks is placed in an air furnace as a whole to perform solid solution treatment on the parts therein. The charcoal is used to react with a small amount of oxygen in the box at high temperature to prevent oxidation reaction between oxygen and the surface of the parts to form an oxide layer on the surface of the parts.

[0021] Optionally, in the heat treatment method of the copper alloy sheet part as described above,

[0022] The cooling method of step 5 is to use a hook to lift the rack containing the parts, transfer it horizontally to the top of the water tank, and put it vertically into the water for a preset time.

[0023] Optionally, in the heat treatment method of the copper alloy sheet part as described above,

[0024] In step 2 and step 6, the copper alloy sheet parts are tied with uncoated iron wire and then vertically hung in the partition of the material rack.

[0025] Optionally, in the heat treatment method of the copper alloy sheet part as described above,

[0026] In step 9, the rack containing the parts is lifted by a hook, placed on the ground in a safe area, and cooled in room temperature air.

[0027] Optionally, in the heat treatment method of the copper alloy sheet part as described above,

[0028] In step 3 and step 7, fine sand is specifically filled in the annular box groove around the box cover as a filler. The fine sand is artificial sand, and the particle diameter is less than 0.25 mm. The fine sand is used to isolate the parts from the circulation of the air in the furnace to ensure that the surface of the parts is not oxidized when heated.

[0029] Beneficial effects of the present invention: A heat treatment method for copper alloy sheet parts provided by an embodiment of the present invention includes a solution treatment and an aging treatment, and a material rack and a heat treatment box developed and prepared by the self-developed material rack and the heat treatment box are used. The heat treatment method provided by the present invention is to clean the copper alloy sheet parts, the heat treatment box and the material rack, tie the parts, and hang them vertically on the material rack, then put the material rack into the box body of the heat treatment box, cover the box cover, seal the box with a clean filler (such as fine sand), put the heat treatment box into a box-type resistance air furnace for solution insulation and aging insulation, cool in water after the solution insulation is completed, and cool in air after the aging insulation is completed. The heat treatment method provided by the present invention can be used for the heat treatment processing of copper alloy sheet parts, so that the copper alloy sheet parts are free of oxidation, high in strength and small in deformation after heat treatment, and can meet the product size and performance requirements. In addition, the method of the present invention is simple to operate, and the structure of the heat treatment box and the material rack 4 used to implement the method is simple, reusable, and low in cost. It has been verified that the copper alloy sheet parts are free of oxidation, high in strength and small in deformation after heat treatment, and can meet the size and performance requirements of the copper alloy sheet parts. Furthermore, the charcoal placed in the heat treatment box before the solution treatment in the heat treatment method provided by the present invention can react with a small amount of oxygen in the box at high temperature to prevent oxygen from reacting with the surface of the part to form an oxide layer on the surface of the part; and in the process of implementing the solution treatment method of the present invention, by placing the heat treatment box in an air furnace, the heat treatment box is in the atmospheric environment of the air furnace, and there is no need to fill gas in the whole process, nor to control gas parameters. Furthermore, in the process of implementing the aging treatment method of the present invention, by placing the heat treatment box in an air furnace, the heat treatment box is in the atmospheric environment of the air furnace, and there is no need to fill gas in the whole process, nor to control gas parameters. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The accompanying drawings are used to provide a further understanding of the technical solution of the present invention and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the technical solution of the present invention and do not constitute a limitation on the technical solution of the present invention.

[0031] Figure 1 A schematic diagram of the structure of a material rack used in the heat treatment method of a copper alloy sheet part provided in an embodiment of the present invention. Figure 1 Figures a and b are schematic diagrams at different angles, Figure c is a top view, and Figure d is a schematic diagram of a three-dimensional structure;

[0032] Figure 2 A schematic diagram of a copper alloy sheet part to be treated by the heat treatment method of a copper alloy sheet part provided in an embodiment of the present invention;

[0033] Figure 3a to Figure 3c A schematic diagram of the structure of a heat treatment box used in the heat treatment method for copper alloy sheet parts provided in an embodiment of the present invention, Figure 3a and Figure 3b The cross-sectional views at different angles are shown in Figure 2. Figure 3c The picture shows a top view. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solution and advantages of the present invention more clear, the embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be noted that the embodiments and features in the embodiments of the present application can be combined with each other arbitrarily without conflict.

[0035] The above background technology has already explained the existing processing methods of copper alloy parts and the problems they have. In order to solve the above problems, an embodiment of the present invention provides a heat treatment method for copper alloy plate parts, which is used to improve the current application status of copper alloy atmosphere protection heat treatment with low production efficiency, narrow applicability and vacuum heat treatment with complex control and low production efficiency. The heat treatment method for copper alloy plate parts provided by the embodiment of the present invention can be used for the heat treatment processing of copper alloy plate parts, so that the copper alloy plate parts are free of oxidation, high strength and small deformation after heat treatment, and can meet the product size and performance requirements.

[0036] The present invention provides the following specific embodiments which can be combined with each other. The same or similar concepts or processes may not be described in detail in some embodiments.

[0037] In order to solve the problems of low production efficiency and narrow applicability of copper alloys through atmosphere protection heat treatment, and the problems of complex control and low production efficiency through vacuum heat treatment, based on the current equipment status, an embodiment of the present invention provides a heat treatment method for copper alloy plate parts. The heat treatment method provided by the embodiment of the present invention adopts solid solution treatment and aging treatment, and the heat treatment method comprises the following steps:

[0038] Step 1, clean the copper alloy sheet parts, heat treatment box and material rack, and blow dry them with compressed air;

[0039] In this step, the copper alloy plate parts, heat treatment box and material rack are cleaned with a cleaning agent and blown dry with compressed air to ensure that there is no excess oil or other residue on the surface after cleaning.

[0040] Step 2, vertically hang at least one copper alloy sheet part in the partition of the material rack, with the interval between adjacent parts being at least 10 mm;

[0041] In this step, uncoated Φ0.8 double-strand iron wire can be used to tie the copper alloy sheet parts and hang them vertically on the rack, with the parts spaced ≥10 mm apart.

[0042] Step 3, placing the rack with parts into the heat treatment box, closing the box cover, and placing fillers in the annular box groove around the box cover until the height of the fillers is basically flush with the upper edge of the annular box groove; and charcoal is also placed in the heat treatment box.

[0043] In this step, it should be noted that the filler in this step is, for example, fine sand; in addition, the charcoal placed in the heat treatment box is used to react with a small amount of oxygen in the box at high temperature to prevent oxygen from oxidizing the surface of the part and forming an oxide layer on the surface of the part.

[0044] Step 4, solution treatment, comprising: placing a heat treatment box containing parts and a material rack in an air furnace for solution treatment, wherein the heating temperature and holding time in the solution treatment are determined according to the material of the parts;

[0045] The solution treatment method of the present invention is: by placing the heat treatment box in an air furnace, the heat treatment box is in the atmospheric environment of the air furnace, and the whole process does not need to be filled with gas, and does not need to control the gas parameters.

[0046] Step 5, use an iron hook to open the box cover, use the iron hook to take out and lift the rack containing parts and put it into water for cooling. After cooling, lift out the rack, remove the parts and use compressed air to blow dry the parts.

[0047] In this step, when placing it in water, be sure to transfer it horizontally to the top of the sink and place it vertically in the water for 1 minute.

[0048] It should be noted that since the copper alloy sheet parts include a copper matrix and alloy elements; during the solid solution heating process of the parts, the alloy elements in the copper alloy sheet parts are dissolved in the copper matrix, and cooling is used to prevent the alloy elements from precipitating from the copper matrix, forming a uniform solid solution.

[0049] Step 6, hang the copper alloy sheet parts that have been dried after solution treatment vertically in the partitions of the material rack, with the interval between adjacent parts being at least 10 mm;

[0050] It should be noted that in step 2 and step 6 of the embodiment of the present invention, the reason for using uncoated iron wire is that the iron wire is placed in an air furnace together with a material rack and a heat treatment box. If coated iron wire is used, the coating is generally galvanized, which will evaporate at high temperature and thus contaminate the parts.

[0051] Step 7, place the rack containing parts into the heat treatment box, cover the box cover, and place fillers in the annular box groove around the box cover until the height of the fillers is basically flush with the upper edge of the annular box groove; the fillers in this step are, for example, fine sand.

[0052] Step 8, aging treatment, includes: placing the heat treatment box containing the parts and the material rack in an air furnace for aging treatment, and the heating temperature and insulation time in the aging treatment are determined according to the material of the parts.

[0053] The aging treatment method in the embodiment of the present invention is: by placing the heat treatment box in an air furnace, the heat treatment box is in the atmospheric environment of the air furnace. During the whole process, there is no need to fill gas or control gas parameters.

[0054] Step 9, use an iron hook to open the box cover, use the iron hook to take out and lift the rack containing parts to cool the whole in the air, lift out the rack after cooling, and remove the parts after cooling.

[0055] In this step, it should be noted that the rack with parts should be placed on the ground in a safe area and cooled in room temperature air. In addition, the above-mentioned solid solution treatment of the parts can dissolve all or most of the alloy elements into the copper matrix, and obtain parts with solid solution after cooling to room temperature; by aging the parts with solid solution at room temperature or higher temperature, the solid solution decomposes and precipitates a second phase, and this precipitated second phase can significantly increase the strength and hardness of the parts.

[0056] In one implementation of the embodiment of the present invention, Figure 1 FIG. 1 is a schematic diagram of the structure of a material rack used in the heat treatment method of a copper alloy sheet part provided in an embodiment of the present invention. Figure 1 Figures a and b are schematic diagrams at different angles, Figure c is a top view, and Figure d is a three-dimensional structural schematic diagram. The material rack 4 in this implementation is set as a columnar frame structure, and the material rack 4 includes a rack bottom and a rack top arranged in parallel, and a support column connected between the rack bottom and the rack top. The rack top is parallel to a plurality of fences, which are used to vertically place copper alloy sheet parts into the material rack and separate them through the fences. Figure 2 Shown is a schematic diagram of a copper alloy sheet part that needs to be treated by the heat treatment method for a copper alloy sheet part provided in an embodiment of the present invention.

[0057] The principle for setting the size of the rack 4 in this implementation is: after the bottom of the rack 4 is placed in the heat treatment box, all structures of the rack 4 except the bottom are at least 50 mm away from the inner wall of the heat treatment box.

[0058] In one implementation of the embodiment of the present invention, Figure 3a to Figure 3c FIG. 1 is a schematic diagram of the structure of a heat treatment box used in the heat treatment method for copper alloy sheet parts provided in an embodiment of the present invention. Figure 3a and Figure 3b The cross-sectional views at different angles are shown in Figure 2. Figure 3cThe heat treatment box in this implementation includes: a cylindrical box body 1 with an opening at one end and a box cover 2, an outer layer of the cylindrical wall 3 is extended along the circumference of the cylindrical wall from the outer side of the opening end of the cylindrical box body 1, and the bottom end surface of the outer layer of the cylindrical wall 3 is connected to the upper part of the cylindrical wall to form an annular box groove 3a between the opening end of the cylindrical wall and the outer layer of the cylindrical wall.

[0059] In an optional embodiment, the copper alloy plate part specification is a plate, and the material is a copper alloy that can be strengthened by heat treatment.

[0060] In an optional implementation scheme, the heat treatment box composed of a box body 1 and a box cover 2 is made of, for example, 1Cr18Ni9Ti steel plate with a thickness of 5 mm, and the box body and the box cover have good sealing properties.

[0061] In an optional implementation scheme, the material rack 4 is made of 1Cr18Ni9Ti rods with a diameter of 5 mm, placed vertically, and has good stability. The size of the material rack is 50 mm smaller than the inner diameter of the heat treatment box to facilitate the placement and retrieval of the material rack.

[0062] In an optional embodiment, the parts vertically suspended on the rack 4 are spaced ≥10 mm apart from each other. The purpose is to make the upper and lower surface temperatures of the parts at the same position consistent during heating and cooling, and to ensure that the deformation of the parts is small.

[0063] In an optional implementation scheme, the rack containing the parts is placed in the heat treatment box. The purpose is to allow the parts to be heated in the closed environment of the heat treatment box. At the same time, the heat loss after the transfer process is small, ensuring that the parts are ultimately free of oxidation and have qualified performance.

[0064] In an optional embodiment, the fine sand used as filler is artificial sand, and the particle diameter is less than 0.25 mm. Clean fine sand is placed in the annular box groove 3a until the height of the fine sand is substantially flush with the upper edge of the annular box groove. The purpose is to use fine sand to isolate the parts from the circulation of the air in the furnace, ensuring that the surface of the parts is not oxidized when heated.

[0065] In the optional implementation scheme, the box-type resistance air furnace is a Class III (GJB 509B) heating furnace. The equipment accuracy meets the requirements and can process copper alloy plate parts.

[0066] In the optional implementation scheme, the purpose of horizontally transferring the parts above the water tank and vertically placing them in the water is to reduce the shaking of the parts during the transfer process, to ensure that the upper and lower surface temperatures at the same position are consistent during cooling, and to ensure that the deformation of the parts is small when the part structure is transformed.

[0067] The heat treatment method of the copper alloy sheet parts provided by the embodiment of the present invention includes a solution treatment and an aging treatment, and adopts a material rack and a heat treatment box developed and prepared by itself. The heat treatment method provided by the present invention is to clean the copper alloy sheet parts, the heat treatment box and the material rack, tie the parts, and hang them vertically on the material rack, then put the material rack into the box body of the heat treatment box, cover the box cover, seal the box with a clean filler (such as fine sand), put the heat treatment box into a box-type resistance air furnace for solution insulation and aging insulation, cool in water after the solution insulation, and cool in air after the aging insulation. The heat treatment method provided by the present invention can be used for the heat treatment processing of copper alloy sheet parts, so that the copper alloy sheet parts are free of oxidation, high in strength and small in deformation after heat treatment, and can meet the product size and performance requirements. In addition, the method of the present invention is simple to operate, and the structure of the heat treatment box and the material rack 4 used to implement the method is simple, reusable, and low in cost. It has been verified that the copper alloy sheet parts are free of oxidation, high in strength and small in deformation after heat treatment, and can meet the size and performance requirements of the copper alloy sheet parts. Furthermore, the charcoal placed in the heat treatment box before the solution treatment in the heat treatment method provided by the present invention can react with a small amount of oxygen in the box at high temperature to prevent oxygen from reacting with the surface of the part to form an oxide layer on the surface of the part; and in the process of implementing the solution treatment method of the present invention, by placing the heat treatment box in an air furnace, the heat treatment box is in the atmospheric environment of the air furnace, and there is no need to fill gas in the whole process, nor to control gas parameters. Furthermore, in the process of implementing the aging treatment method of the present invention, by placing the heat treatment box in an air furnace, the heat treatment box is in the atmospheric environment of the air furnace, and there is no need to fill gas in the whole process, nor to control gas parameters.

[0068] The implementation method of the heat treatment method of the copper alloy sheet parts provided in the embodiments of the present invention is described below through some specific examples.

[0069] Embodiment 1

[0070] This embodiment 1 provides a heat treatment method for a copper alloy plate part, the heat treatment method comprising a solution treatment and an aging treatment, and specifically comprising the following steps:

[0071] Step 1: Clean the copper alloy sheet parts, heat treatment box and material rack with a cleaning agent, and blow them dry with compressed air to ensure that there is no oil or other excess on the surface after cleaning.

[0072] Specifically, step 1 includes: using cotton yarn dipped in 5503 cleaning agent to wipe the copper alloy plate parts, the heat treatment box shown in FIG3 and Figure 1 The material rack 4 shown in the figure is wiped clean and blown dry with compressed air, and the cleaned surface is wiped with a white gauze glove. Visually check that the white gauze glove is free of oil stains, and make sure that the cleaned surface is free of oil stains and other excess materials.

[0073] Step 2: Use uncoated Φ0.8 double-strand iron wire to tie the copper alloy sheet parts and hang them vertically. Figure 2 On the rack shown, the parts are spaced ≥10mm apart.

[0074] Specifically, step 2 includes: after tying the copper alloy sheet parts, use the excess wire to straighten the wire upward along the surface of the part plate, and then hang the wire head on the rack, the parts are spaced ≥10mm apart, and the parts cannot contact the heat treatment box or the rack.

[0075] Step 3: Place the rack with parts into the heat treatment box (area marked 1 in Figure 3), close the box cover (area marked 2 in Figure 3), and put clean fine sand into the annular box groove (area marked 3a in Figure 3) until the height of the sand is basically flush with the upper edge of the box seam.

[0076] Specifically, step 3 includes: wearing clean gloves, placing the rack containing the parts into the heat treatment box by hand, and the clean fine sand used is dried sand.

[0077] Step 4: Place the heat treatment box containing the parts into the box-type resistance air furnace for the solution insulation process.

[0078] Specifically, step 4 includes: after the equipment reaches the set temperature, turn off the heating power supply, open the furnace door, put the heat treatment box containing the parts into the box-type resistance air furnace (GJB 509B Class III), close the furnace door, turn on the heating power supply, keep warm for a period of time as required, turn off the heating power supply, open the furnace door, take the heat treatment box out of the furnace, and place it next to the sink.

[0079] Step 5: Use an iron to open the box cover, and use an iron hook to lift the rack containing parts for cooling (transfer horizontally to the top of the water tank, and put it vertically into the water for 1 minute), then lift out the rack, unload the parts, and immediately blow dry the parts with compressed air.

[0080] Specifically, step 5 includes: using pliers to cut the wire, and wearing clean gloves to remove the parts.

[0081] Step 6: Use uncoated Φ0.8 double-strand iron wire to tie the copper alloy sheet parts and hang them vertically on the rack, with the parts spaced ≥10mm apart.

[0082] Specifically, step 6 includes: after tying the copper alloy sheet parts, use the excess wire to straighten the wire upward along the surface of the part plate, and then hang the wire head on the rack, the parts are spaced ≥10mm apart, and the parts cannot contact the heat treatment box or the rack.

[0083] Step 7: Place the rack with parts into the heat treatment box, close the box cover, and put clean fine sand into the seams of the box until the height of the sand is basically flush with the upper edge of the seams.

[0084] Specifically, step 7 includes: wearing clean gloves, placing the rack containing the parts into the heat treatment box by hand, and the clean fine sand used is dried sand.

[0085] Step 8: Place the heat treatment box containing the parts into the box-type resistance air furnace for aging and heat preservation process.

[0086] Specifically, step 8 includes: after the equipment reaches the set temperature, turn off the heating power supply, open the furnace door, put the heat treatment box containing the parts into the box-type resistance air furnace (GJB 509B Class III), close the furnace door, turn on the heating power supply, keep warm for a period of time as required, turn off the heating power supply, open the furnace door, take the heat treatment box out of the furnace, and place it next to the sink.

[0087] Step 9: Use an iron to open the box cover, and use an iron hook to lift the rack containing the parts for cooling (place it on the ground in a safe area to cool in room temperature air), and then remove the parts after cooling.

[0088] Specifically, step 9 includes: using pliers to cut the wire, and wearing clean gloves to remove the parts.

[0089] After solution treatment and aging treatment, copper alloy sheet parts have no oxidation on the surface, high material strength and small deformation, which can meet the product size and performance requirements.

[0090] Embodiment 2

[0091] The design requirements of a chrome bronze QCr0.5 rotor end plate part are that the hardness HV is not less than 110HV0.5, the tensile strength Rm ≥ 350MPa, and the elongation after fracture A50mm ≥ 18%. Heat treatment is performed on XX batches of chrome bronze QCr0.5 rotor end plate parts. The part dimensions are as follows: Figure 2 As shown, the material is a heat-treatable strengthened copper alloy with a specification of 1.5 mm thick plate. The tensile specimen is processed according to GB / T228.1. The material standard is Q / YS007-2021. A box-type resistance air furnace (GJB509BⅢ) is used for heat treatment.

[0092] Step 1: Use cotton yarn dipped in 5503 cleaning agent to wipe the rotor end plate parts, the heat treatment box shown in Figure 3 and Figure 1 Wipe the material rack shown in the figure clean and blow it dry with compressed air. Wipe the cleaned surface with a white gauze glove and visually check whether the white gauze glove is oily or not. Make sure that there is no oil or other excess on the cleaned surface.

[0093] Step 2: After tying the rotor end plate parts with uncoated Φ0.8 double-strand iron wire, use the excess iron wire to straighten the wire upward along the surface of the part plate, and then hang the wire head on the rack. The parts should be spaced ≥10mm apart, and the parts should not touch the heat treatment box or the rack. Hang them vertically on the rack. Figure 1 On the rack shown.

[0094] Step 3: Wear clean gloves and put the rack with parts into the heat treatment box body 1 (Figure 3, area 1), cover the box cover 2 (Figure 3, area 2), and put clean fine sand into the annular box groove ( Figure 1 Mark 3a area) until the sand level is basically flush with the upper edge of the box seam.

[0095] Step 4: After the equipment reaches the set temperature, place the heat treatment box containing the parts into a box-type resistance air furnace (GJB509BⅢ type) for solid solution insulation process, the temperature is 960℃±10℃, and the insulation time is 25min~30min.

[0096] Step 5: Use an iron to open the box cover, and use an iron hook to lift the rack containing parts for cooling (transfer horizontally to the top of the water tank, and put it vertically into the water for 1 minute), then lift out the rack, unload the parts, and immediately blow dry the parts with compressed air.

[0097] Step 6: After tying the rotor end plate parts with uncoated Φ0.8 double-strand iron wire, use the excess iron wire to straighten the wire upward along the surface of the part plate, and then hang the wire head on the rack. The parts should be spaced ≥10mm apart from each other, and the parts should not touch the heat treatment box or the rack. Hang them vertically on the rack. Figure 1 On the rack shown.

[0098] Step 7: Wearing clean gloves, place the rack with parts into the heat treatment box (Figure 3, area 1) by hand, close the box cover (Figure 3, area 2), and put clean fine sand into the annular box groove (Figure 3, area 3) until the height of the sand is basically flush with the upper edge of the box seam.

[0099] Step 8: After the equipment reaches the set temperature, place the heat treatment box containing the parts into a box-type resistance air furnace (GJB509BⅢ type) for aging and insulation process, the temperature is 500℃±10℃, and the insulation time is 2h~3h.

[0100] Step 9: Use an iron to open the box cover, and use an iron hook to lift the rack containing the parts for cooling (place it on the ground in a safe area to cool in room temperature air), and then remove the parts after cooling.

[0101] XX batch of chromium bronze QCr0.5 rotor end plate parts were heat treated according to the above steps, and the mechanical properties were sent to the testing department for testing. The surface state and performance results are shown in Table 1 below.

[0102] Table 1 Statistics of the whole process processing results

[0103]

[0104] It can be seen from Table 1 that the XX batch of chromium bronze QCr0.5 rotor end plate parts are heat treated according to the above steps. The performance of the rotor end plate parts is significantly improved, the surface flatness is good, the metallographic structure of the parts surface is not oxidized, the surface hardness HV is (126~130)HV0.5, the tensile strength Rm is (379~386)MPa, and the elongation after fracture A50mm is (28.3~29.5)%, which meets the design requirements of surface hardness HV not less than 110HV0.5, tensile strength Rm≥350MPa, and elongation after fracture A50mm≥18%.

[0105] After multiple verifications of different products and different batches, this heat treatment method can significantly improve the performance, the surface flatness of the parts is good, there is no oxidation on the surface of the parts, and the surface hardness, tensile strength Rm and elongation after fracture A50mm can meet the product size and performance requirements.

[0106] Although the embodiments disclosed in the present invention are as above, the contents are only embodiments adopted to facilitate understanding of the present invention and are not intended to limit the present invention. Any technician in the field to which the present invention belongs can make any modifications and changes in the form and details of implementation without departing from the spirit and scope disclosed in the present invention, but the patent protection scope of the present invention shall still be subject to the scope defined in the attached claims.

Claims

1. A method for heat treatment of copper alloy sheet parts, characterized in that: include: Step 1, clean the copper alloy sheet parts, heat treatment box and material rack, and blow dry them with compressed air; Step 2, vertically hang at least one copper alloy sheet part in the partition of the material rack, and the interval between adjacent parts is at least 10 mm; Step 3, placing the rack with parts in the heat treatment box, closing the box cover, and placing fillers in the annular box groove around the box cover until the height of the fillers is substantially flush with the upper edge of the annular box groove; charcoal is also placed in the heat treatment box; Step 4, solution treatment, comprising: placing a heat treatment box containing parts and a material rack in an air furnace for solution treatment, wherein the heating temperature and holding time in the solution treatment are determined according to the material of the parts; Step 5, open the box cover, take out the rack with parts and put it into water for cooling. After cooling, lift out the rack, remove the parts and use compressed air to dry the parts; Step 6, hang the copper alloy sheet parts that have been dried after solution treatment vertically in the partitions of the material rack, with the interval between adjacent parts being at least 10 mm; Step 7, put the rack with parts into the box body of the heat treatment box, cover the box cover, and place fillers in the annular box groove around the box cover until the height of the fillers is basically flush with the upper edge of the annular box groove; Step 8, aging treatment, including: placing the heat treatment box containing the parts and the material rack in an air furnace for aging treatment, and the heating temperature and holding time in the aging treatment are determined according to the material of the parts; Step 9, open the box cover, take out the rack containing parts and cool it in the air as a whole. After cooling, lift out the rack and remove the parts after cooling.

2. The heat treatment method of copper alloy sheet parts according to claim 1, characterized in that: The material rack (4) is configured as a columnar frame structure, the material rack (4) comprises a rack bottom and a rack top arranged in parallel, and pillars connected between the rack bottom and the rack top, and a plurality of fences are arranged in parallel on the rack top, which are used to vertically place copper alloy plate parts into the material rack and separate them through the fences; The size of the material rack (4) is set such that after the bottom of the material rack (4) is placed in the heat treatment box, all structures of the material rack (4) except the bottom of the material rack (4) are at least 50 mm away from the inner wall of the heat treatment box.

3. The heat treatment method of copper alloy sheet parts according to claim 1, characterized in that: The heat treatment box comprises: a cylindrical box body (1) with an opening at one end and a box cover (2); an outer layer of the cylindrical wall (3) extends from the outer side of the open end of the cylindrical box body (1) along the circumference of the cylinder wall, and the bottom end surface of the outer layer of the cylindrical wall (3) is connected to the upper part of the cylinder wall to form an annular box groove (3a) between the open end of the cylinder wall and the outer layer of the cylinder wall.

4. The heat treatment method for a copper alloy sheet part according to any one of claims 1 to 3, characterized in that: In step 4, the heat treatment box containing the charcoal, parts and racks is placed in an air furnace as a whole to perform solid solution treatment on the parts therein. The charcoal is used to react with a small amount of oxygen in the box at high temperature to prevent oxidation reaction between oxygen and the surface of the parts to form an oxide layer on the surface of the parts.

5. The heat treatment method for a copper alloy sheet part according to any one of claims 1 to 3, characterized in that: The cooling method of step 5 is to use a hook to lift the rack containing the parts, transfer it horizontally to the top of the water tank, and put it vertically into the water for a preset time.

6. The heat treatment method for a copper alloy sheet part according to any one of claims 1 to 3, characterized in that: In step 2 and step 6, the copper alloy sheet parts are tied with uncoated iron wire and then vertically hung in the partition of the material rack.

7. The heat treatment method for a copper alloy sheet part according to any one of claims 1 to 3, characterized in that: In step 9, the rack containing the parts is lifted by a hook, placed on the ground in a safe area, and cooled in room temperature air.

8. The heat treatment method for a copper alloy sheet part according to any one of claims 1 to 3, characterized in that: In step 3 and step 7, fine sand is specifically filled in the annular box groove around the box cover as a filler. The fine sand is artificial sand, and the particle diameter is less than 0.25 mm. The fine sand is used to isolate the parts from the circulation of the air in the furnace to ensure that the surface of the parts is not oxidized when heated.

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