Machining process method for plate spring structure of engine test bench

Abstract

The invention belongs to the technical field of machining, and particularly provides an engine test bench plate spring structure machining process method which comprises the following steps: S1, preparing a blank of a required specification and size of a part, and blanking the blank; s2, the blanked workpiece is subjected to heat treatment; s3, carrying out linear cutting on the workpiece subjected to heat treatment, wherein the linear cutting is carried out twice or three times; and S4, hole milling machining is conducted on the workpiece obtained after linear cutting, and forming machining of the plate spring is completed. S5, flaw detection is conducted on the formed plate springs, and the formed plate springs meeting the standard are screened; s6, the formed plate spring meeting the standard is subjected to surface treatment, plate spring machining is completed, the problems that in the existing plate spring part machining process, deformation is prone to occurring, and the thickness is uneven are solved, and the rejection rate is high; in the machining process of the plate spring part, the problems of deformation and uneven thickness are not prone to occurring, and the yield is high.

Description

Technical Field

[0001] The invention belongs to the technical field of mechanical processing, and in particular relates to a processing method for a leaf spring structure of an engine test bench. Background Art

[0002] The leaf spring structure is a key component of the test frame and the primary part of the connection between the moving frame and the fixed frame. It is used to support the mass of the FDJ-moving frame combination and provide a small displacement degree of freedom along the axial movement of the FDJ, so that the thrust of the FDJ can be fully applied to the sensor. Structural features, see Figure 6-Figure 11 The size of the middle or two end areas (the range reaches more than 76%) is 0.5±0.03mm or 0.8±0.03mm, which is relatively thin and requires high dimensional accuracy and form and position tolerances. This narrow and long groove structure is prone to deformation and uneven thickness (processing tilt) during processing, with a high scrap rate, which affects the comprehensive accuracy of the engine test after assembly. Summary of the invention

[0003] The invention provides a method for processing a leaf spring structure of an engine test bench, aiming to overcome the problems of deformation and uneven thickness that are prone to occur during the processing of leaf spring parts in the prior art, resulting in a high scrap rate.

[0004] To this end, the present invention provides a method for processing a leaf spring structure of an engine test bench, comprising the following steps: S1. Prepare the blanks of the required specifications and sizes for the parts and cut the blanks; S2, heat treating the workpiece after cutting; S3, performing wire cutting on the workpiece after heat treatment; the leaf spring includes a leaf spring with a hole in the middle and a leaf spring without a hole in the middle. When the workpiece needs to be processed into a leaf spring with a hole in the middle, the wire cutting is performed three times; when the workpiece needs to be processed into a leaf spring without a hole in the middle, the wire cutting is performed two times; S4, performing milling processing on the workpiece after wire cutting to complete the forming processing of the leaf spring; S5. Detect the formed leaf springs and select the formed leaf springs that meet the standards; S6. Perform surface treatment on the formed leaf spring that meets the standards to complete the leaf spring processing. Preferably, the step S1 of cutting the materials is performed by laser cutting.

[0005] Preferably, when cutting the material in step S1, the fiber direction of the blank is required to be the same as the long side direction of the leaf spring to be processed.

[0006] Preferably, the heat treatment in step S2 is quenching first and then tempering.

[0007] Preferably, the three cutting steps in step S3 are: first cutting: cutting a hole in the middle of the leaf spring on the workpiece; second cutting: cutting the outer shape of the leaf spring on the workpiece; third cutting: cutting the groove of the leaf spring on the workpiece; The first cutting in two cuts is performed in the same manner as the second cutting in three cuts, and the second cutting in two cuts is performed in the same manner as the third cutting in three cuts.

[0008] Preferably, the three cuttings include the following steps: first, processing a wire threading hole one for the first cutting and a wire threading hole two for the second cutting on the workpiece, then clamping and positioning the workpiece, placing the workpiece flat on the cutting equipment, threading the wire through the wire threading hole one to complete the first cutting; threading the wire through the wire threading hole two to complete the second cutting; finally, when the workpiece is placed upright, processing a vertical wire threading hole three on one side of the short side vertical surface of the workpiece close to the groove forming position, threading the wire through the wire threading hole three to complete the third cutting.

[0009] Preferably, the three outer open parts of the threading hole are welded.

[0010] Preferably, during the third cutting, when half of the cutting is completed on one side of the long side of the workpiece, the cut and formed part is attracted by magnetic attraction.

[0011] Preferably, during the cutting, the starting point and the pause point of the cutting route are both located at the clamping end of the workpiece.

[0012] Preferably, the surface treatment is hard chrome plating or zinc plating.

[0013] Beneficial effects of the present invention: 1. The engine test bench leaf spring structure processing method provided by the present invention comprises the following steps: S1, preparing blanks of required specifications and sizes for parts, and cutting the blanks; S2, heat treating the workpiece after cutting; S3, performing wire cutting on the workpiece after heat treatment; the leaf spring comprises a leaf spring with a hole in the middle and a leaf spring without a hole in the middle. When the workpiece needs to be processed into a leaf spring with a hole in the middle, the wire cutting is performed for three times; when the workpiece needs to be processed into a leaf spring without a hole in the middle, the wire cutting is performed for two times; S4, performing milling processing on the workpiece after wire cutting to complete the forming processing of the leaf spring; S5, performing flaw detection on the formed leaf spring to select the formed leaf springs that meet the standards; S6, performing surface treatment on the formed leaf springs that meet the standards to complete the processing of the leaf spring; the process method is not prone to deformation and uneven thickness during the processing of leaf spring parts, and has high processing accuracy and high yield rate.

[0014] 2. The engine test bench leaf spring structure processing method provided by the present invention improves processing accuracy and processing efficiency by adopting laser cutting.

[0015] 3. The engine test bench leaf spring structure processing method provided by the present invention quenches and then tempers the workpiece after cutting, thereby removing the stress of the material itself and avoiding the problem of deformation of the workpiece after cutting or making the deformation much smaller.

[0016] 4. The engine test bench leaf spring structure processing method provided by the present invention adopts two or three cutting processes in the wire cutting process, and is processed according to clear wire threading methods, clamping positioning and cutting route requirements. The leaf spring has high processing accuracy, high yield rate and good mechanical properties. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be further described in detail below with reference to the accompanying drawings.

[0018] Figure 1 It is a flow chart of a processing method for a leaf spring structure of an engine test bench; Figure 2 This is a schematic diagram of the fiber direction of the leaf spring without holes in the middle; Figure 3 This is the schematic diagram of the second cutting line of the middle leaf spring without hole ( Figure 2 Left view); Figure 4 This is a schematic diagram of the fiber orientation of a leaf spring with a hole in the middle; Figure 5 This is the third cutting circuit diagram of the leaf spring with a hole in the middle ( Figure 4 Left view); Figure 6 This is the main view of the leaf spring structure after three cuts; Figure 7 yes Figure 6 Right view of; Figure 8 This is a three-dimensional diagram of the leaf spring structure after three cuts; Fig. 9 This is the main view of the leaf spring structure after two cuts; Fig.10 This is a three-dimensional diagram of the leaf spring structure after two cuts; Fig.11 yes Fig. 9 Right view of .

[0019] Description of the accompanying drawings: 1. Wire threading hole three. DETAILED DESCRIPTION

[0020] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples are only used to explain the present invention and are not used to limit the scope of the present invention. If specific conditions are not specified in the embodiments, they are carried out according to normal conditions or conditions recommended by the manufacturer. If the manufacturer is not specified for the reagents or instruments used, they are all conventional products that can be purchased commercially.

[0021] Embodiment 1: like Figure 1 As shown, a method for processing a leaf spring structure of an engine test bench comprises the following steps: S1. Prepare the blanks of the required specifications and sizes for the parts and cut the blanks; Specifically, the blank determines the appropriate machining allowance according to the leaf spring structure.

[0022] S2, heat treating the workpiece after cutting; S3, performing wire cutting on the workpiece after heat treatment; the leaf spring includes a leaf spring with a hole in the middle and a leaf spring without a hole in the middle. When the workpiece needs to be processed into a leaf spring with a hole in the middle, the wire cutting is performed three times; when the workpiece needs to be processed into a leaf spring without a hole in the middle, the wire cutting is performed two times; S4, performing milling processing on the workpiece after wire cutting to complete the forming processing of the leaf spring; Specifically, the milling process is to process the connecting holes between the leaf spring and the movable frame and the fixed frame. Before the milling process, a tooling is made, the parts are placed flat in the tooling, and the two ends are pressed with a pressing plate near the processing hole to protect the clamping and complete the round hole processing.

[0023] S5. Detect the formed leaf springs and select the formed leaf springs that meet the standards; Specifically, the processed leaf spring is subjected to magnetic particle inspection to check for inclusions, cracks, etc.

[0024] S6. Perform surface treatment on the formed leaf spring that meets the standards to complete the leaf spring processing. This process method is less likely to cause deformation and uneven thickness problems during the processing of leaf spring parts, and has high processing accuracy and high yield rate.

[0025] Preferably, when the blank is clamped, the blank clamping surface is 10mm larger than the part forming size on one side, and the blank non-clamping surface has a 2-3.5mm margin on one side according to the part forming size, so as to ensure that the part has enough material for clamping and positioning, and to ensure that the surface that the molybdenum wire passes through during the entire processing process is a uniformly hardened surface.

[0026] Embodiment 2: Based on Example 1, the step S1 of cutting the material is performed by laser cutting.

[0027] Specifically, the cutting methods mainly include mechanical cutting, laser cutting and plasma cutting, etc. During the cutting process, attention should be paid to ensuring the dimensional accuracy and surface quality of the blank to reduce the difficulty and scrap rate of subsequent processing. At present, the thickness of the part plate is ≤20mm, and laser cutting is selected to improve the processing accuracy and efficiency.

[0028] Preferably, when cutting the material in step S1, the fiber direction of the blank is required to be the same as the long side direction of the leaf spring to be processed.

[0029] Specifically, the fiber direction of the blank is required to be the same as the long side direction of the leaf spring to be processed, so as to ensure the mechanical properties of the leaf spring structure in actual use.

[0030] Preferably, the blank material is 60Si2MnA. Specifically, the cutting requirements of raw materials are unified, the utilization rate of raw materials is relatively high, and the production cost of the enterprise is greatly reduced.

[0031] Embodiment 3: Based on Example 2, the heat treatment in step S2 is quenching first and then tempering.

[0032] Specifically, quenching and tempering before cutting can remove the stress of the material itself, avoiding the problem of deformation of the workpiece after cutting or making the deformation much smaller.

[0033] Embodiment 4: On the basis of Example 3, Figure 2-Figure 5 As shown, the three cutting steps in step S3 are: the first cutting step is to cut a hole in the middle of the leaf spring on the workpiece; the second cutting step is to cut the outer shape of the leaf spring on the workpiece; the third cutting step is to cut the groove of the leaf spring on the workpiece; The first cutting in two cuts is performed in the same manner as the second cutting in three cuts, and the second cutting in two cuts is performed in the same manner as the third cutting in three cuts.

[0034] Specifically, this operation can meet the needs of cutting two types of leaf springs, and has simple operation and good applicability.

[0035] Preferably, the three cuttings include the following steps: first, processing a wire threading hole 1 for the first cutting and a wire threading hole 2 for the second cutting on the workpiece, then clamping and positioning the workpiece, placing the workpiece flat on the cutting equipment, threading the wire through the wire threading hole 1 to complete the first cutting; threading the wire through the wire threading hole 2 to complete the second cutting; finally, when the workpiece is placed upright, processing a vertical wire threading hole 3 1 on one side of the short side vertical surface of the workpiece close to the groove forming position, threading the wire through the wire threading hole 3 1 to complete the third cutting.

[0036] Specifically, when clamping and positioning the workpiece, place the short side of the workpiece horizontally on the longitudinal beam of the cutting equipment, and place the positioning surface horizontally on the longitudinal guide rail with a single side of 10mm. Press the two ends tightly, first process the large square hole in the middle, thread the wire through the threading hole (threading hole 1) in the middle of the large square hole, adjust the equipment parameters: pulse width, pulse interval and current, align the edges, complete the processing of the large square hole in the middle, and complete the first cutting; Without disassembling the workpiece, cut the leaf spring shape for the second time, thread the wire through the threading hole (threading hole 2) of the processed shape, align the edges, and process to the size required by the drawing; Place the short side of the workpiece upright on the longitudinal beam of the cutting equipment, position the edge 10mm on one side, press both ends tightly, thread the wire from threading hole 3, adjust the equipment parameters: pulse width, pulse interval and current, align the edge, and perform closed contour processing.

[0037] Preferably, the cutting parameters of the first cutting and the second cutting in the three cuttings are the same.

[0038] Specifically, the same cutting parameters make the operation easier.

[0039] Preferably, the cutting parameters for the first and second cuttings in the three cuttings are pulse width 16, pulse interval 8 and current 4; in the third cutting in the three cuttings: leaf spring structure width 50mm, wire cutting groove part parameters: pulse width 8, pulse interval 8, current 2; leaf spring structure width 110~120mm, wire cutting groove part parameters: pulse width 16, pulse interval 8, current 3.

[0040] Specifically, the cutting parameters improve cutting accuracy.

[0041] Preferably, the outer open portion of the threading hole 3 1 is welded.

[0042] Specifically, at the outer opening of the threading hole 31 (i.e. Figure 3 and Figure 4 The threading hole 3 (the right side position) is welded to avoid deformation due to unbalanced material stress (opening deformation or closing deformation) and perform closed contour processing.

[0043] Preferably, the welding is segmented welding.

[0044] Specifically, segmented welding is simple to operate and ensures material stress balance.

[0045] Preferably, during the third cutting, when half of the cutting is completed on one side of the long side of the workpiece, the cut and formed part is attracted by magnetic attraction.

[0046] Specifically, this operation prevents the parts from being deformed or falling due to their own weight.

[0047] Preferably, during the cutting, the starting point and the pause point of the cutting route are both located at the clamping end of the workpiece.

[0048] Specifically, the leaf spring cutting route is clearly defined, the starting point of the processing is arranged near the clamping end, the cutting section separated from the clamping part is arranged at the end of the processing path, and the pause point is set near the clamping end of the workpiece, preferably at the rounded corner on one side of the leaf spring structure to avoid obvious joints when restarting the cutting. Figure 3 , Figure 4 As shown, the cutting route is: A→B→C→D…L→A.

[0049] Preferably, the surface treatment is hard chrome plating or zinc plating.

[0050] Specifically, the surface is hard chrome plated or zinc plated to make it beautiful, wear-resistant and rust-proof.

[0051] Preferably, the silk is water wrapped during cutting.

[0052] Specifically, water is wrapped around the molybdenum wire during the processing to ensure the fluidity of the water, which can prevent oxidation deformation caused by electrical corrosion.

[0053] Preferably, the distance between the workpiece and the upper cantilever and the lower cantilever is 30-40 mm.

[0054] Specifically, the upper cantilever and the lower cantilever are both close to the leaf spring workpiece with a spacing of 30 to 40 mm, which can prevent error deformation caused by the vibration of the molybdenum wire.

[0055] In the description of the present invention, it is necessary to understand that if there are terms such as "outside" and "inside" indicating an orientation or positional relationship, it is based on the orientation or positional relationship shown in the drawings, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as a limitation on the present invention.

[0056] The above examples are merely illustrative of the present invention and do not constitute a limitation on the protection scope of the present invention. All designs that are the same or similar to the present invention fall within the protection scope of the present invention.

Claims

1. A method for processing a leaf spring structure of an engine test bench, characterized in that: The steps include: S1. Prepare the blanks of the required specifications and sizes for the parts and cut the blanks; S2, heat treating the workpiece after cutting; S3, performing wire cutting on the workpiece after heat treatment; the leaf spring includes a leaf spring with a hole in the middle and a leaf spring without a hole in the middle. When the workpiece needs to be processed into a leaf spring with a hole in the middle, the wire cutting is performed three times; when the workpiece needs to be processed into a leaf spring without a hole in the middle, the wire cutting is performed two times; S4, performing milling processing on the workpiece after wire cutting to complete the forming processing of the leaf spring; S5. Detect the formed leaf springs and select the formed leaf springs that meet the standards; S6. Perform surface treatment on the formed leaf spring that meets the standards to complete the leaf spring processing.

2. The engine test bench leaf spring structure processing method according to claim 1, characterized in that: In step S1, cutting is performed by laser cutting.

3. The engine test bench leaf spring structure processing method according to claim 1, characterized in that: When cutting the material in step S1, it is required that the fiber direction of the blank is the same as the long side direction of the leaf spring to be processed.

4. The engine test bench leaf spring structure processing method according to claim 1, characterized in that: The heat treatment in step S2 is quenching first and then tempering.

5. The engine test bench leaf spring structure processing method according to claim 1, characterized in that: The three cutting steps in step S3 are: first cutting: cutting a hole in the middle of the leaf spring on the workpiece; second cutting: cutting the outer shape of the leaf spring on the workpiece; third cutting: cutting the groove of the leaf spring on the workpiece; The first of the two cuts is performed in the same manner as the second of the three cuts, and the second of the two cuts is performed in the same manner as the third of the three cuts.

6. The engine test bench leaf spring structure processing method according to claim 5, characterized in that: The three-time cutting comprises the following steps: firstly, processing a first threading hole 1 and a second threading hole 2 on the workpiece for the first cutting, then clamping and positioning the workpiece, placing the workpiece flat on the cutting device, threading the wire through the first threading hole, and completing the first cutting; threading the wire through the second threading hole, and completing the second cutting; finally, when the workpiece is placed upright, processing a vertical threading hole 3 (1) on one side of the short side of the workpiece near the groove forming position, and threading the wire through the third threading hole (1), and completing the third cutting.

7. The engine test bench leaf spring structure processing method according to claim 6, characterized in that: The outer open portion of the threading hole three (1) is welded.

8. The engine test bench leaf spring structure processing method according to claim 6, characterized in that: During the third cutting, when half of the cutting is completed on one side of the long side of the workpiece, the cut and formed part is attracted by magnetic attraction.

9. The engine test bench leaf spring structure processing method according to claim 6, characterized in that: During the cutting, the starting point and the stopping point of the cutting route are both located at the clamping end of the workpiece.

10. The engine test bench leaf spring structure processing method according to claim 1, characterized in that: The surface treatment is hard chrome plating or zinc plating.

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