An engine test bench plate spring structure processing method

Abstract

The application belongs to the technical field of machining, and specifically provides an engine test bench plate spring structure machining process method, which comprises the following steps: S1, preparing a blank with a required specification and size of a part, and blanking the blank; S2, heat treating the blanked workpiece; S3, linear cutting the heat treated workpiece, which is twice or thrice cutting; S4, milling hole processing the linear cut workpiece, and completing the forming processing of the plate spring; S5, flaw detection of the formed plate spring, and screening the formed plate spring meeting the standard; and S6, surface treatment of the formed plate spring meeting the standard, and completing the plate spring processing, which solves the problems of easy deformation and uneven thickness and high waste rate in the machining process of the existing plate spring part; the plate spring part is not prone to deformation and uneven thickness in the machining process, and the finished product rate is high.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of mechanical processing, and particularly relates to a processing process method for a plate spring structure of an engine test bench. BACKGROUND

[0002] The plate spring structure is a key component of the test bench, is a primary part for connecting the movable frame and the fixed frame, is used for supporting the mass of the FDJ-movable frame combination, and provides a small displacement freedom degree for axial movement of the FDJ, so that the entire thrust of the FDJ is applied to the sensor. The structural characteristics are shown in Figures 6-11 The middle or both end parts have a size of 0.5+ / -0.03mm or 0.8+ / -0.03mm, are relatively thin, and have high requirements for dimensional accuracy and geometric tolerance. During the processing of the narrow and long groove structure, deformation and uneven thickness (processing inclination) are prone to occur, and the waste rate is relatively high. After assembly, the comprehensive accuracy of the engine test is affected. SUMMARY

[0003] The processing process method for the plate spring structure of the engine test bench provided by the application aims to overcome the problems of deformation and uneven thickness of the plate spring part during the processing in the prior art, and has a relatively high waste rate.

[0004] Therefore, the application provides a processing process method for a plate spring structure of an engine test bench, which comprises the following steps:

[0005] S1, preparing a blank with a required specification and size of a part, and cutting the blank;

[0006] S2, heat treating the cut workpiece;

[0007] S3, performing wire cutting on the heat-treated workpiece; the plate spring comprises a middle-hole plate spring and a middle-no-hole plate spring, when the workpiece needs to be processed into the middle-hole plate spring, the wire cutting is three times, and when the workpiece needs to be processed into the middle-no-hole plate spring, the wire cutting is twice;

[0008] S4, performing hole milling processing on the wire-cut workpiece to complete the forming processing of the plate spring;

[0009] S5, performing flaw detection on the formed plate spring to screen the formed plate spring meeting the standard;

[0010] S6, performing surface treatment on the formed plate spring meeting the standard to complete the processing of the plate spring.

[0011] Preferably, the cutting in the step S1 adopts laser cutting.

[0012] Preferably, during the cutting in the step S1, the fiber direction of the blank is required to be the same as the long side direction of the plate spring to be processed.

[0013] Preferably, the step S2 heat treatment is quenching and tempering.

[0014] Preferably, the step S3 three-time cutting is: first-time cutting: cutting the hole in the middle of the spring on the workpiece; second-time cutting: cutting the shape of the spring on the workpiece; third-time cutting: cutting the recess part of the spring on the workpiece.

[0015] The first-time cutting in the two-time cutting is the same as the second-time cutting in the three-time cutting, and the second-time cutting in the two-time cutting is the same as the third-time cutting in the three-time cutting.

[0016] Preferably, the three-time cutting includes the following steps: first, machining the first-time cutting wire hole one and the second-time cutting wire hole two on the workpiece, then clamping and positioning the workpiece, placing the workpiece flat on the cutting equipment, threading the wire from the wire hole one, and completing the first-time cutting; threading the wire from the wire hole two, and completing the second-time cutting; finally, machining the vertical wire hole three near the recess forming position on the short side vertical surface of the workpiece when the workpiece is placed vertically, threading the wire from the wire hole three, and completing the third-time cutting.

[0017] Preferably, the outside open part of the wire hole three is welded.

[0018] Preferably, when cutting the workpiece on one side of the long edge for half, the formed part is attracted by magnetism.

[0019] Preferably, the starting cutting point and the pause point of the cutting route are located at the clamping end of the workpiece.

[0020] Preferably, the surface treatment is hard chromium plating or zinc plating.

[0021] The beneficial effects of the present application are:

[0022] 1. The engine test bench spring structure processing method provided by the present application includes the following steps: S1, preparing the blank of the required specifications and sizes of the parts, and cutting the blank; S2, heat treating the cut workpiece; S3, linear cutting the heat treated workpiece; the spring includes a hole in the middle and a hole-free spring in the middle, when the workpiece needs to be processed into a hole in the middle, the linear cutting is three-time cutting; when the workpiece needs to be processed into a hole-free spring in the middle, the linear cutting is two-time cutting; S4, milling the hole of the linear cut workpiece to complete the forming processing of the spring; S5, inspecting the formed spring for defects to screen the formed spring meeting the standard; S6, surface treating the formed spring meeting the standard to complete the spring processing; the process method is not prone to deformation and uneven thickness problems in the processing of the spring parts, has high processing precision, and has high yield.

[0023] 2、The engine test bench plate spring structure processing technology method provided by the application has high machining precision and machining efficiency.

[0024] 3、The engine test bench plate spring structure processing technology method provided by the application removes the stress of the material itself by quenching and then tempering the workpiece after blanking, so that the workpiece will not deform or will deform less after cutting.

[0025] 4、The engine test bench plate spring structure processing technology method provided by the application has high machining precision, high product yield and good mechanical properties by twice or three times cutting forming in the wire cutting process according to the requirements of clear wire threading mode, clamping positioning and cutting route. BRIEF DESCRIPTION OF DRAWINGS

[0026] The application will be further described in detail below with reference to the drawings.

[0027] Figure 1 is a flowchart of the engine test bench plate spring structure processing technology method;

[0028] Figure 2 is a schematic view of the fiber direction of the intermediate non-hole plate spring;

[0029] Figure 3 is a schematic view of the second cutting route of the intermediate non-hole plate spring (left view); Figure 2

[0030] Figure 4 is a schematic view of the fiber direction of the intermediate hole plate spring;

[0031] Figure 5 is a schematic view of the third cutting route of the intermediate hole plate spring (left view); Figure 4

[0032] Figure 6 is a front view of the plate spring structure after three times cutting;

[0033] Figure 7 is a right view of Figure 6 ;

[0034] Figure 8 is a perspective view of the plate spring structure after three times cutting;

[0035] Figure 9 is a front view of the plate spring structure after twice cutting;

[0036] Figure 10 is a perspective view of the plate spring structure after twice cutting;

[0037] Figure 11 is a right view of Figure 9 .​​

[0038] BRIEF DESCRIPTION OF DRAWINGS DETAILED DESCRIPTION

[0039] The principles and features of the present application are described below in connection with the accompanying drawings, in which the examples are used to explain the present application and are not intended to limit the scope of the present application. Unless otherwise specified, the specific conditions in the examples are carried out according to the conventional conditions or the conditions recommended by the manufacturer. The reagents or instruments used are not specified by the manufacturer, and are conventional products that can be purchased on the market.

[0040] Example 1

[0041] As shown in the drawings, a processing method of an engine test bench plate spring structure includes the following steps: Figure 1

[0042] S1, preparing a blank with the required specifications and dimensions of the parts, and cutting the blank;

[0043] Specifically, the blank is determined according to the plate spring structure to determine the appropriate machining allowance.

[0044] S2, heat treating the workpiece after cutting;

[0045] S3, line cutting the workpiece after heat treatment; the plate spring includes a middle hole plate spring and a middle holeless plate spring, when the workpiece needs to be machined into a middle hole plate spring, the line cutting is three times; when the workpiece needs to be machined into a middle holeless plate spring, the line cutting is twice;

[0046] S4, milling the workpiece after line cutting to complete the forming processing of the plate spring;

[0047] Specifically, the milling processing is to process the plate spring and the dynamic frame and the fixed frame mounting connecting hole, and the tooling is made before milling, the parts are placed in the tooling, the two ends are pressed tightly at the position close to the processing hole by the pressing plate, the clamping is protected, and the round hole processing is completed.

[0048] S5, inspecting the formed plate spring for defects to screen the formed plate spring that meets the standard;

[0049] Specifically, the formed plate spring is subjected to magnetic powder flaw detection to check for inclusions, cracks, etc.

[0050] S6, surface treating the formed plate spring that meets the standard to complete the plate spring processing.

[0051] The process method is not prone to deformation and uneven thickness problems in the processing of plate spring parts, has high processing precision, and has high yield.

[0052] ​Preferably, when clamping the blank, the clamping surface of the blank is 10mm larger than the forming size of the part on one side, and the non-clamping surface of the blank has a margin of 2-3.5mm on one side according to the forming size of the part. This ensures that the part has sufficient material for clamping and positioning, and that the surfaces through which the molybdenum wire passes during the entire processing are uniformly hardened surfaces.

[0053] Example 2:

[0054] Based on Example 1, the material cutting in step S1 is performed using laser cutting.

[0055] Specifically, the main blanking methods include mechanical cutting, laser cutting, and plasma cutting. During the blanking process, it is crucial to ensure the dimensional accuracy and surface quality of the blank to reduce the difficulty of subsequent processing and the scrap rate. Currently, for parts with a plate thickness ≤20mm, laser cutting is chosen to improve processing accuracy and efficiency.

[0056] Preferably, during the blanking process 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.

[0057] Specifically, the fiber direction of the blank must be the same as the long side direction of the leaf spring to be processed, so as to ensure the mechanical performance of the leaf spring structure in actual use.

[0058] Preferably, the blank material is 60Si2MnA.

[0059] Specifically, standardized raw material requirements result in higher raw material utilization rates, significantly reducing production costs for enterprises.

[0060] Example 3:

[0061] Based on Example 2, the heat treatment in step S2 is quenching followed by tempering.

[0062] Specifically, quenching followed by tempering before cutting removes the stress inherent in the material, thus preventing or minimizing deformation of the workpiece after cutting.

[0063] Example 4:

[0064] Based on Example 3, such as Figures 2-5 As shown, the three cuts in step S3 are: first cut: cutting the hole in the middle of the leaf spring on the workpiece; second cut: cutting the outline of the leaf spring on the workpiece; third cut: cutting the groove of the leaf spring on the workpiece.

[0065] The method of the first cut in two cuts is the same as that of the second cut in three cuts, and the method of the second cut in two cuts is the same as that of the third cut in three cuts.

[0066] Specifically, the operation can meet the cutting of two plate springs, is simple in operation, and is good in applicability.

[0067] Preferably, the three-time cutting comprises the following steps: firstly, processing a first-time cutting wire hole one and a second-time cutting wire hole two on the workpiece, then clamping and positioning the workpiece, placing the workpiece horizontally on the cutting equipment, threading the wire from the wire hole one, and completing the first-time cutting; threading the wire from the wire hole two, and completing the second-time cutting; finally, placing the workpiece vertically, processing a vertical wire hole three 1 near the groove forming position on the vertical side of the short side of the workpiece, threading the wire from the wire hole three 1, and completing the third-time cutting.

[0068] Specifically, when the workpiece is clamped and positioned, the short side of the workpiece is placed horizontally on the longitudinal beam of the cutting equipment, the positioning surface is horizontally placed on the longitudinal guide rail with a single side of 10 mm, and both ends are pressed tightly. The middle large square hole is processed first, the wire is threaded from the wire hole (wire hole one) of the middle large square hole, the equipment parameters are adjusted: pulse width, pulse interval and current, the edge is found, the processing of the middle large square hole is completed, and the first-time cutting is completed.

[0069] Without disassembling the workpiece, the second-time cutting plate spring contour is processed, the wire is threaded from the wire hole (wire hole two) of the processed contour, the edge is found, and the processing is performed to the size required by the drawing.

[0070] The short side of the workpiece is placed vertically on the longitudinal beam of the cutting equipment, the positioning edge is placed with a single side of 10 mm, both ends are pressed tightly, the wire is threaded from the wire hole three 1, the equipment parameters are adjusted: pulse width, pulse interval and current, the edge is found, and the closed contour processing is performed.

[0071] Preferably, the cutting parameters of the first-time cutting and the second-time cutting in the three-time cutting are the same.

[0072] Specifically, the same cutting parameters are easy to operate.

[0073] Preferably, the cutting parameters of the first-time cutting and the second-time cutting in the three-time cutting are pulse width 16, pulse interval 8 and current 4; in the third-time cutting in the three-time cutting: the plate spring structure width is 50 mm, the wire cutting groove part parameters are pulse width 8, pulse interval 8 and current 2; the plate spring structure width is 110-120 mm, the wire cutting groove part parameters are pulse width 16, pulse interval 8 and current 3.

[0074] Specifically, the cutting parameters improve the cutting precision.

[0075] Preferably, the outside open part of the wire hole three 1 is welded.

[0076] Specifically, the outside open part of the wire hole three 1 (i.e. Figure 3 and Figure 4 the right side position of the wire hole three 1) is welded, deformation (open deformation or closed deformation) caused by unbalanced material stress is avoided, and the closed contour processing is performed.

[0077] Preferably, the welding is sectional welding.

[0078] Specifically, the sectional welding operation is simple and ensures material stress balance.

[0079] Preferably, when the third cutting is performed, the formed part is attracted by a magnet when cutting is performed halfway along the long side of the workpiece.

[0080] Specifically, this operation prevents the part from deforming or falling due to gravity.

[0081] Preferably, when the cutting is performed, the starting point and the pause point of the cutting route are located at the clamping end of the workpiece.

[0082] Specifically, the cutting route of the leaf spring is determined, the starting point of the machining is arranged close to the clamping end, the cutting section separated from the clamping part of the leaf spring is arranged at the end of the machining path, and the pause point is arranged close to the clamping end of the workpiece, preferably at the round corner of one side of the leaf spring structure, so as to avoid obvious cutting joints when the cutting is restarted. Figure Three 、 Figure Four As shown in the drawing, the cutting route is: A→B→C→D……L→A.

[0083] Preferably, the surface treatment is surface hard chromium plating or zinc plating.

[0084] Specifically, through surface hard chromium plating or zinc plating, the surface is beautiful, wear-resistant and rust-proof.

[0085] Preferably, the cutting is performed with water wrapping the wire.

[0086] Specifically, the water wraps the molybdenum wire during the machining process, so as to ensure the smoothness of the water and prevent oxidation deformation caused by electric corrosion.

[0087] Preferably, the distance between the workpiece and the upper and lower suspensions is 30-40 mm.

[0088] Specifically, the upper and lower suspensions are close to the leaf spring workpiece, and the distance is 30-40 mm, so as to prevent error deformation caused by molybdenum wire shaking.

[0089] In the description of the present application, it should be understood that the orientation or position relationship indicated by the terms "outer", "inner" and the like is based on the orientation or position relationship shown in the drawings, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore the terms describing the position relationship in the drawings are only used for exemplary description, and cannot be understood as a limitation on the present application.

[0090] The above examples are only illustrative of the present application and do not constitute a limitation on the scope of protection of the present application, and any design identical or similar to the present application falls within the scope of protection of the present application.

Claims

1. A manufacturing process for a leaf spring structure of an engine test bench, characterized in that: It comprises the following steps: S1, preparing a blank with the required specifications and dimensions of the part, and cutting the blank; S2, heat treating the cut workpiece; S3, line cutting the heat treated workpiece; the flat spring comprises a middle hole flat spring and a middle holeless flat spring, when the workpiece needs to be processed into a middle hole flat spring, the line cutting is three times; when the workpiece needs to be processed into a middle holeless flat spring, the line cutting is twice; The three times cutting in step S3 is: first cutting: cutting the hole in the middle of the workpiece; second cutting: cutting the shape of the workpiece; third cutting: cutting the groove part of the workpiece; the first cutting in the twice cutting is the same as the second cutting in the three times cutting, and the second cutting in the twice cutting is the same as the third cutting in the three times cutting; The three times cutting comprises the following steps: first, processing the first cutting wire hole one and the second cutting wire hole two on the workpiece, then clamping and positioning the workpiece, placing the workpiece on the cutting equipment, threading the wire from the wire hole one, completing the first cutting; threading the wire from the wire hole two, completing the second cutting; finally, when the workpiece is placed vertically, a vertical wire hole three (1) is processed near the groove forming position on the short side vertical surface of the workpiece, the wire is threaded from the wire hole three (1), and the third cutting is completed; S4, milling the workpiece after line cutting to complete the forming processing of the flat spring; S5, inspecting the formed flat spring for defects and selecting the formed flat spring that meets the standard; S6, surface treatment of the formed flat spring that meets the standard to complete the processing of the flat spring.

2. The engine test bed leaf spring structure machining process method of claim 1, wherein: The cutting in step S1 adopts laser cutting.

3. The engine test bed leaf spring structure machining process method as claimed in claim 1, wherein: When cutting in step S1, the fiber direction of the blank is required to be the same as the long side direction of the flat spring to be processed.

4. The engine test bed leaf spring structure machining process method as claimed in claim 1, wherein: The heat treatment in step S2 is quenching first and then tempering.

5. The engine test bed leaf spring structure machining process method as claimed in claim 1, wherein: The outside open part of the wire hole three (1) is welded.

6. The engine test bed leaf spring structure machining process method as claimed in claim 1, wherein: When cutting in the third cutting, the formed part is attracted by magnet when cutting half of the workpiece on one side of the long side.

7. The engine test bed leaf spring structure machining process method as claimed in claim 1, wherein: When cutting, the cutting start point and pause point of the cutting route are located at the clamping end of the workpiece.

8. The engine test bed leaf spring structure machining process method as claimed in claim 1, wherein: The surface treatment is surface hard chromium plating or zinc plating.

Images