A preparation method and application of an elastic clamping part fixture

Abstract

The present invention discloses a preparation method for an elastic clamping part fixture, which comprises the following steps: S1, obtaining a blank after rough milling of the raw material; S2, quenching the blank; S3, obtaining the fixture after finish milling and wire cutting of the blank. The fixture prepared by the method of the present invention has good elasticity, is not easy to deform, has a high usage frequency, can ensure the machining accuracy of parts, and multiple parts can be installed on the fixture at one time, improving production efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of fixture manufacturing, and specifically relates to a preparation method and application of an elastic clamping part fixture. Background Art

[0002] In the mechanical processing and manufacturing industry, some parts need to be clamped by special fixtures to complete the processing, and some parts have high requirements. In order to improve work efficiency, it is necessary to reasonably design the tooling fixtures, which must not only meet the clamping accuracy requirements of the workpieces, but also meet the machining accuracy requirements, and the tooling fixtures must not cause scratches and pinches to the parts.

[0003] Currently, when manufacturing the anode cap of the anode for medical use during production and processing, a flat-jaw vice is usually used for clamping. Since it is necessary to adapt the clamping mouth of the flat-jaw vice to the part, only one part can be clamped each time, resulting in low efficiency. Moreover, the clamping force of the flat-jaw vice is not easy to control, indentations will be generated on the surface of the part, and the part size is unstable and the consistency is poor.

[0004] Therefore, there is an urgent need for a preparation method of an elastic clamping part fixture that can improve production efficiency and reduce surface damage to parts. Summary of the Invention

[0005] To solve the above technical problems, the present invention provides a preparation method and application of an elastic clamping part fixture.

[0006] The technical solution of the present invention is: a preparation method of an elastic clamping part fixture, including the following steps,

[0007] S1. Rough machining

[0008] After rough milling the raw material, a blank is obtained;

[0009] S2. Heat treatment

[0010] S2-1. Quenching treatment:

[0011] Quench the blank. The quenching method is: heat the blank to 800 - 860 °C, keep it warm for 5 - 10 minutes, then immerse the blank in a molten salt at 300 - 330 °C and keep it for 3 - 6 minutes, then heat the blank again to raise the temperature of the blank to 380 - 400 °C, and then immerse the blank in water and cool it to room temperature;

[0012] S2-2. Tempering treatment:

[0013] Heat the blank to 520 - 560 °C and keep it warm for 15 - 25 minutes;

[0014] S2-3. Cooling treatment:

[0015] After the insulation is completed, the blank is immersed in the coolant, and the coolant is in a flowing state with a flow rate of 1-2 m / s, until the surface temperature of the blank drops by 200-220°C, the blank is taken out of the coolant and continues to be heated, so that the surface temperature of the blank rises by 100-120°C, and the temperature is kept for 5-10 minutes;

[0016] S2-4, repeating step S2-3, and reducing the flow rate of the coolant by 0.1-0.3 m / s each time the blank is heated, until the blank temperature drops to room temperature and then is dried;

[0017] S3, finishing

[0018] The heat-treated blank is subjected to fine milling and wire cutting to machine part mounting holes and elastic grooves to obtain a fixture.

[0019] Description: The clamp prepared by the method of the present invention has good elasticity and is not easy to deform. It has a high frequency of use, and the elastic clamping method can protect the surface of the parts, avoiding damage to the surface of the parts caused by the traditional clamping method of flat-nose pliers, and can ensure the processing accuracy of the parts. The clamp can install multiple parts at a time to improve production efficiency. At the same time, the flowing coolant is used for tempering. The flowing coolant can quickly take away the heat on the surface of the blank. Reducing the flow rate of the coolant can slow down the cooling rate of the blank, avoiding the formation of cracks inside the blank after the blank is cooled continuously and rapidly, and the elastic deformation ability of the blank is further improved by multiple alternating cooling and heating.

[0020] Furthermore, the structure of the clamp includes a clamp body, which is a rectangular parallelepiped; the clamp body is provided with a plurality of part mounting holes, the centers of the plurality of part mounting holes are located on the same straight line, the clamp body is provided with an elastic groove for dividing the plurality of part mounting holes into equal parts, the clamp body located on one side of the elastic groove is a clamping portion, the clamping portion is provided with a plurality of dividing grooves for dividing the part mounting holes into a plurality of groups, and the dividing grooves are arranged perpendicular to the elastic grooves, and a clamping screw is provided on the clamping portion located at each group of part mounting holes.

[0021] Description: After the parts are loaded into the fixture of the above structure, the clamping part can be clamped under the tightening of the clamping screw. This clamping method can well protect the surface of the part from being crushed, and the clamping screw is controlled by a torque wrench. The clamping force of each clamping screw is consistent, and the force on the parts is also uniform, which can ensure the processing consistency of the parts.

[0022] Furthermore, the elastic groove is composed of a wire groove located at the part mounting hole and an arc groove located at the lower end of the part mounting hole.

[0023] Description: The arc-shaped groove has a larger space, enabling the clamping part to have a larger deformation space, so that the clamping part can better clamp the part and avoid insecure clamping.

[0024] Further, in step S1, the raw material is 65Mn.

[0025] Description: 65Mn has good hardenability, good elasticity after quenching, and can maintain it for a long time, which can meet the fixture performance requirements of the present invention.

[0026] Further, in step S2, the molten salt is composed of calcium oxalate, potassium tartrate, and sodium nitrate mixed in a mass ratio of 3:2:5.

[0027] Description: The above molten salt has an appropriate cooling rate and good hardenability, which can reduce cracks and deformations generated during the high-temperature cooling process of the blank. Combined with the water-cooling method after the blank is heated, the structure of the blank is further refined, the yield strength and fatigue resistance of the blank are improved, and the service life of the fixture is increased.

[0028] Further, in step S3, the surface roughness of the part mounting hole reaches Ra0.4.

[0029] Description: Limiting the surface roughness of the part mounting hole can prevent the surface of the part from being scratched when the part is clamped.

[0030] Further, in step S2, the components of the coolant include, by mass percentage: 15-30% of propylene glycol, 10-20% of sodium polyacrylate, 15-20% of ethylene glycol dimethacrylate, 5-8% of triethanolamine, and the balance deionized water.

[0031] Description: The above coolant has good cooling capacity and fluidity, can quickly cool the blank when flowing, and can isolate air to avoid oxidation of the blank surface. After tempering with the coolant, the elastic deformation ability of the blank can be improved, and the coolant is safe to use and has less pollution.

[0032] Further, the present invention provides an application of the preparation method in the preparation of an anode cap fixture for a medical anode casting target.

[0033] Description: Applying it to the preparation of an anode cap fixture for a medical anode casting target can effectively improve production efficiency and ensure the processing accuracy of the medical anode casting target anode cap.

[0034] The beneficial effects of the present invention are:

[0035] (1) After the part is loaded into the fixture prepared by the method of the present invention, the clamping part can be clamped under the tightening of the compression screw. This clamping method can well protect the surface of the part from being damaged, and the compression screw is controlled by a torque wrench to ensure the processing consistency of the part.

[0036] (2) The clamp prepared by the method of the present invention has good elasticity and is not easy to deform. It has a high frequency of use and can avoid damage to the surface of parts caused by the traditional clamping method of flat-nose pliers. The processing accuracy of the parts can be guaranteed. The clamp can install multiple parts at a time, thereby improving production efficiency.

[0037] (3) The method of the present invention uses a flowing coolant for tempering. The flowing coolant can quickly take away the heat from the surface of the blank, and reducing the flow rate of the coolant can slow down the cooling rate of the blank, thereby avoiding cracks inside the blank after continuous rapid cooling of the blank, and further improving the elastic deformation capacity of the blank by alternating cooling and heating multiple times. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 is an overall schematic diagram of the clamp structure of Example 1 of the present invention;

[0039] Figure 2 This is a front view of the clamp in Example 1 of the present invention;

[0040] Figure 3 is a side view of a clamp according to embodiment 1 of the present invention;

[0041] Among them, 1-clamp body, 2-mounting hole, 3-elastic groove, 4-dividing groove, 5-clamping screw. DETAILED DESCRIPTION

[0042] The present invention is further described in detail below in conjunction with specific implementation methods to better reflect the advantages of the present invention.

[0043] Example 1

[0044] A method for preparing an elastic clamp for holding parts, comprising the following steps:

[0045] S1. Rough machining

[0046] The raw material is roughly milled to obtain a blank, wherein the raw material is 65Mn;

[0047] S2. Heat treatment

[0048] S2-1, quenching treatment:

[0049] The blank is quenched, and the quenching method is: heating the blank to 830°C and keeping it warm for 8 minutes, then immersing the blank in molten salt at 320°C for 5 minutes, and then heating the blank again to raise the temperature of the blank to 390°C, and then immersing the blank in water to cool to room temperature, wherein the molten salt is composed of calcium oxalate, potassium tartrate, and sodium nitrate mixed in a mass ratio of 3:2:5;

[0050] S2-2, Tempering treatment:

[0051] Heat the blank to 540 °C and hold for 20 min;

[0052] S2-3, Cooling treatment:

[0053] After the heat preservation is completed, immerse the blank in the coolant, keep the coolant in a flowing state with a flow rate of 1.5 m / s. Until the surface temperature of the blank drops by 210 °C, take out the blank from the coolant and continue to heat the blank to increase the surface temperature of the blank by 110 °C;

[0054] The composition of the coolant by mass percentage includes: 20% propylene glycol, 15% sodium polyacrylate, 18% ethylene glycol dimethacrylate, 6% triethanolamine, and the balance deionized water;

[0055] Repeat step S2-3, and each time the blank is heated, the flow rate of the coolant is reduced by 0.2 m / s until the temperature of the blank drops to room temperature and then it is dried;

[0056] S3, Finish machining

[0057] Perform finish milling and wire cutting on the heat-treated blank to machine the part mounting holes 2 and the elastic groove 3 to obtain the fixture, and the surface roughness of the part mounting holes reaches Ra0.4;

[0058] As Figure 1 , 2 , 3 shown, the structure of the fixture includes a fixture body 1, and the fixture body 1 is a cuboid;

[0059] There are twelve part mounting holes 2 on the fixture body 1, and the centers of every six of the part mounting holes 2 are located on the same straight line. There is an elastic groove 3 on the fixture body 1 for bisecting the six part mounting holes 2. The fixture body 1 on one side of the elastic groove 3 is a clamping part. There are two dividing grooves 4 on the clamping part for dividing the part mounting holes 2 into three groups. Each group has two part mounting holes 2, and the dividing grooves 4 are perpendicular to the elastic groove 3. A compression screw 5 is provided on the clamping part at each group of part mounting holes 2;

[0060] The elastic groove 3 is composed of a wire groove at the part mounting hole 2 and an arc groove at the lower end of the part mounting hole 2;

[0061] The preparation method is applied to prepare the anode cap fixture for medical anodic cast targets.

[0062] Example 2

[0063] This example is basically the same as Example 1, except that in step S2-1, the blank is heated to 800 °C and held for 5 min.

[0064] Example 3

[0065] This example is basically the same as Example 1, except that in step S2-1, the blank is heated to 860 °C and held for 10 min.

[0066] Example 4

[0067] This example is basically the same as Example 1, except that in step S2-1, the insulated blank is immersed in molten salt at 300 °C and held for 3 min, then the blank is heated again to raise the temperature of the blank to 380 °C, and then the blank is immersed in water and cooled to room temperature.

[0068] Example 5

[0069] This example is basically the same as Example 1, except that in step S2-1, the insulated blank is immersed in molten salt at 330 °C and held for 6 min, then the blank is heated again to raise the temperature of the blank to 400 °C, and then the blank is immersed in water and cooled to room temperature.

[0070] Example 6

[0071] This example is basically the same as Example 6, except that in step S2-1, the blank is heated to 520 °C and held for 15 min.

[0072] Example 7

[0073] This example is basically the same as Example 6, except that in step S2-1, the blank is heated to 560 °C and held for 25 min.

[0074] Example 8

[0075] This example is basically the same as Example 6, except that in step S2-3, the coolant is in a flowing state and the flow rate is 1 m / s.

[0076] Example 9

[0077] This example is basically the same as Example 6, except that in step S2-3, the coolant is in a flowing state and the flow rate is 2 m / s.

[0078] Example 10

[0079] This example is basically the same as Example 6, except that in step S2-3, after the surface temperature of the blank drops by 200 °C, the blank is taken out of the coolant and the blank is heated continuously to raise the surface temperature of the blank by 100 °C.

[0080] Example 11

[0081] This embodiment is basically the same as Embodiment 6, except that in step S2-3, after the temperature of the blank surface drops by 220 °C, the blank is taken out of the coolant and the blank is continuously heated to increase the temperature of the blank surface by 120 °C.

[0082] Embodiment 12

[0083] This embodiment is basically the same as Embodiment 6, except that in step S2-4, the flow rate of the coolant decreases by 0.1 m / s after each temperature increase of the blank.

[0084] Embodiment 13

[0085] This embodiment is basically the same as Embodiment 6, except that in step S2-4, the flow rate of the coolant decreases by 0.3 m / s after each temperature increase of the blank.

[0086] Embodiment 14

[0087] This embodiment is basically the same as Embodiment 6, except that the composition of the coolant includes, by mass percentage: 15% propylene glycol, 10% sodium polyacrylate, 15% ethylene glycol dimethacrylate, 5% triethanolamine, and the balance deionized water.

[0088] Embodiment 15

[0089] This embodiment is basically the same as Embodiment 6, except that the composition of the coolant includes, by mass percentage: 30% propylene glycol, 20% sodium polyacrylate, 20% ethylene glycol dimethacrylate, 8% triethanolamine, and the balance deionized water.

[0090] Experimental Example

[0091] In order to explore the elastic deformation performance of the fixtures prepared in each embodiment, tensile specimens were taken from the fixtures prepared in each embodiment for tensile tests, and the exploration results are as follows:

[0092] 1. Explore the influence of quenching temperature and holding time on the performance of the fixture

[0093] Taking Embodiments 1, 2, and 3 as experimental comparisons, the performance of the fixtures obtained is shown in Table 1 below:

[0094] Table 1 Fixture performance obtained at different quenching temperatures and holding times

[0095]

[0096]

[0097] As can be seen from the data in Table 1, the yield strength of the fixture sample in Example 1 is the highest, indicating that the fixture obtained with the quenching temperature and holding time selected in Example 1 is not prone to plastic deformation, has better elasticity, and the quenching temperature and holding time selected in Example 1 are more optimal.

[0098] 2. Explore the influence of quenching and cooling parameters on the performance of the fixture

[0099] Taking Examples 1, 4, and 5 as experimental comparisons, and based on Example 1, directly immersing the blank after heat preservation in water and cooling it to room temperature is used as Comparative Example 1; based on Example 1, directly immersing the blank after heat preservation in molten salt and cooling it to room temperature is used as Comparative Example 2. The performance of the obtained fixtures is shown in Table 2 below:

[0100] Table 2 Performance of fixtures obtained with different quenching and cooling parameters

[0101] Group Yield Strength (MPa) Example 1 864 Example 4 838 Example 5 844 Comparative Example 1 806 Comparative Example 2 822

[0102] As can be seen from the data in Table 2, compared with Examples 1, 4, and 5, the yield strength of the fixture sample in Example 1 is the highest, indicating that the fixture obtained with the quenching and cooling parameters selected in Example 1 has better elasticity, and the quenching and cooling parameters selected in Example 1 are more optimal. Compared with Comparative Examples 1 and 2, the yield strength of the fixture sample in Example 1 is the highest, indicating that the cooling method in Example 1 is more optimal.

[0103] 3. Explore the influence of tempering methods on the performance of the fixture

[0104] Based on Example 1, directly putting the blank after heat preservation in tempering treatment into water for cooling is used as Comparative Example 3. The performance of the obtained fixtures is shown in Table 3 below:

[0105] Table 3 Performance of fixtures obtained with different tempering methods

[0106] Group Yield Strength (MPa) Example 1 864 Comparative Example 3 789

[0107] As can be seen from the data in Table 3, the yield strength of the fixture sample obtained with the tempering method in Example 1 is higher, indicating that the fixture obtained with the tempering method in Example 1 has better elasticity, and the tempering method in Example 1 is more optimal.

[0108] 4. Explore the influence of tempering temperature and holding time on the performance of the fixture

[0109] Taking Examples 1, 6, and 7 as experimental comparisons, the performance of the obtained fixtures is shown in Table 4 below:

[0110] Table 4 Performance of fixtures obtained with different tempering temperatures and holding times

[0111] Group Yield Strength (MPa) Example 1 864 Example 6 842 Example 7 845

[0112] As can be seen from the data in Table 4, the yield strength of the fixture specimen in Example 1 is the highest, indicating that the fixture has better elasticity with the tempering temperature and holding time selected in Example 1, and the tempering temperature and holding time selected in Example 1 are more optimal.

[0113] 5. Explore the influence of coolant flow rate on the performance of the fixture

[0114] Taking Examples 1, 8, and 9 as experimental comparisons, and taking Example 1 as a reference, with the coolant not flowing as Comparative Example 4, the fixture performance obtained is shown in Table 5 below:

[0115] Table 5 Fixture performance obtained with different coolant flow rates

[0116] Group Yield Strength (MPa) Example 1 864 Example 8 847 Example 9 843 Comparative Example 4 821

[0117] As can be seen from the data in Table 5, among Examples 1, 8, and 9, the yield strength of the fixture specimen in Example 1 is the highest, indicating that the fixture has better elasticity with the coolant flow rate selected in Example 1, and the coolant flow rate selected in Example 1 is more optimal; compared with Comparative Example 4, the yield strength of the fixture specimen in Example 1 is higher, indicating that the tempering effect of the coolant in the flowing state is better.

[0118] 6. Explore the influence of the blank surface temperature on the performance of the fixture

[0119] Taking Examples 1, 10, and 11 as experimental comparisons, the fixture performance obtained is shown in Table 6 below:

[0120] Table 6 Fixture performance obtained with different blank surface temperatures

[0121] Group Yield Strength (MPa) Example 1 864 Example 10 849 Example 11 851

[0122] As can be seen from the data in Table 6, the yield strength of the fixture specimen in Example 1 is the highest, indicating that the fixture has better elasticity with the blank surface temperature selected in Example 1, and the blank surface temperature selected in Example 1 is more optimal.

[0123] 7. Explore the influence of the change in coolant flow rate on the performance of the fixture

[0124] Taking Examples 1, 12, and 13 as experimental comparisons, and taking Example 1 as a reference, with the coolant flow rate not changing as Comparative Example 5, the fixture performance obtained is shown in Table 7 below:

[0125] Table 7 Fixture performance obtained with different changes in coolant flow rate

[0126] Group Yield Strength (MPa) Example 1 864 Example 12 840 Example 13 843 Comparative Example 5 835

[0127] As can be seen from the data in Table 7, when comparing Examples 1, 12, and 13, the yield strength of the fixture specimen in Example 1 is the highest, indicating that the fixture has better elasticity with the coolant flow rate change selected in Example 1, and the coolant flow rate change selected in Example 1 is more optimal; when comparing Example 1 with Comparative Example 5, the yield strength of the fixture specimen in Example 1 is higher, indicating that the tempering method with the change in coolant flow rate is more optimal.

[0128] 8. Explore the influence of coolant composition on the performance of the fixture

[0129] Taking Examples 1, 14, and 15 as experimental comparisons, and using Example 1 as a reference, deionized water was used to replace ethylene glycol dimethacrylate in the coolant as Comparative Example 6. The performance of the obtained fixture is shown in Table 8 below:

[0130] Table 8 Fixture performance obtained with different coolant compositions

[0131]

[0132]

[0133] As can be seen from the data in Table 8, when comparing Examples 1, 14, and 15, the yield strength of the fixture specimen in Example 1 is the highest, indicating that the fixture has better elasticity with the coolant composition selected in Example 1, and the coolant composition selected in Example 1 is more optimal; when comparing Example 1 with Comparative Example 6, the yield strength of the fixture specimen in Example 1 is higher, indicating that the yield strength of the fixture will decrease after removing ethylene glycol dimethacrylate from the coolant.

Claims

1. A preparation method for an elastic clamping part fixture, characterized in that, Including the following steps, S1. Rough machining After rough milling the raw material, a blank is obtained; S2. Heat treatment S2-1. Quenching treatment: Quench the blank. The quenching method is: heat the blank to 800 - 860 °C, keep it warm for 5 - 10 min, then immerse the blank in molten salt at 300 - 330 °C and keep it for 3 - 6 min, then heat the blank again to raise the temperature of the blank to 380 - 400 °C, and then immerse the blank in water and cool it to room temperature; S2-2. Tempering treatment: Heat the blank to 520 - 560 °C and keep it warm for 15 - 25 min; After the heat preservation is completed, immerse the blank in the coolant, keep the coolant in a flowing state with a flow rate of 1 - 2 m / s, until the surface temperature of the blank drops by 200 - 220 °C, then take out the blank from the coolant and continue to heat the blank to raise the surface temperature of the blank by 100 - 120 °C; The composition of the coolant by mass percentage includes: 15 - 30% propylene glycol, 10 - 20% sodium polyacrylate, 15 - 20% ethylene glycol dimethacrylate, 5 - 8% triethanolamine, and the balance deionized water; Repeat step S2-3, and the flow rate of the coolant decreases by 0.1 - 0.3 m / s each time the blank is heated, until the temperature of the blank drops to room temperature and then it is dried; S3. Finish machining Perform finish milling and wire cutting on the heat-treated blank to machine the part mounting holes (2) and the elastic groove (3) to obtain a fixture.

2. The preparation method of an elastic clamping part fixture according to claim 1, characterized in that, The structure of the fixture includes a fixture body (1), and the fixture body (1) is a cuboid; A plurality of part mounting holes (2) are provided on the fixture body (1), the centers of the plurality of part mounting holes (2) are located on the same straight line, an elastic groove (3) for bisecting the plurality of part mounting holes (2) is provided on the fixture body (1), the fixture body (1) on one side of the elastic groove (3) is a clamping part, a plurality of dividing grooves (4) for dividing the part mounting holes (2) into multiple groups are provided on the clamping part, and the dividing grooves (4) are perpendicular to the elastic groove (3), and a pressing screw (5) is provided on the clamping part at each group of part mounting holes (2).

3. A method for preparing a fixture for an elastic clamping part according to claim 2, characterized in that, The elastic groove (3) is composed of a wire groove at the part mounting hole (2) and an arc groove at the lower end of the part mounting hole (2).

4. A method for preparing an elastic clamping part fixture according to claim 1, characterized in that, In step S1, the raw material is 65Mn.

5. A method for preparing an elastic clamping part fixture according to claim 1, characterized in that, In step S2, the molten salt is composed of calcium oxalate, potassium tartrate, and sodium nitrate mixed in a mass ratio of 3:2:

5.

6. A method for preparing a fixture for an elastic clamping part according to claim 1, characterized in that, In step S3, the surface roughness of the part mounting hole reaches Ra0.

4.

7. The preparation method of the elastic clamping part fixture according to any one of claims 1 to 6, characterized in that, The preparation method is applied to prepare an anode cap fixture for a medical anode casting target.

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