CN111366122A - Frame longitudinal beam flatness measuring method and frame positioning detection tool - Google Patents
Frame longitudinal beam flatness measuring method and frame positioning detection tool Download PDFInfo
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- CN111366122A CN111366122A CN201811604717.1A CN201811604717A CN111366122A CN 111366122 A CN111366122 A CN 111366122A CN 201811604717 A CN201811604717 A CN 201811604717A CN 111366122 A CN111366122 A CN 111366122A
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- lifting lug
- frame
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- longitudinal beam
- support
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
- G01B21/30—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring roughness or irregularity of surfaces
Abstract
The invention relates to a frame longitudinal beam flatness measuring method and a frame positioning detection tool, wherein the detection tool comprises a working platform, a lifting lug support and a lifting lug positioning shaft, an inserting shaft section of the lifting lug positioning shaft is detachably, in inserting and matching with a lifting lug hole on a frame for mounting a plate spring and is coaxially positioned and matched, a supporting shaft section of the lifting lug positioning shaft is positioned and supported by a V-shaped groove of the lifting lug support, and the V-shaped groove forms a V-shaped positioning structure which is used for positioning the outer circle of the supporting shaft section so that the positioning axis of the lifting lug positioning shaft is parallel to a measuring reference plane and has a set distance b. And judging whether the flatness of the upper surface of the longitudinal beam of the frame is qualified or not by measuring whether the difference value between the actual distance between a plurality of positions of the upper surface of the longitudinal beam of the frame and the measuring reference surface and the standard value L is within an error allowable range or not. The problem of adopt the benchmark seat frock to directly support at the lower terminal surface of longeron among the prior art, have the location benchmark inaccurate and detection error is big is solved.
Description
Technical Field
The invention relates to a frame longitudinal beam flatness measuring method and a frame positioning detection tool.
Background
The frame is used as an important component of the vehicle, and a power system, a transmission system and a suspension system are arranged on the frame and bear and transmit various forces or moments from roads and the vehicle. The flatness of the upper surfaces of the left and right frame rails directly affects the stability and balance of the frame. At present, the flatness of the upper surface of the frame longitudinal beam is directly detected under the matching use of a level gauge and a box ruler. The cooperation direct detection that adopts spirit level and box chi has the problem that detection error is big, detection efficiency is low, can't realize batch production inspection.
The patent of chinese utility model with the publication number CN201828218U discloses a "car frame testing platform", which includes a working platform, and a reference seat fixedly connected with the working platform for supporting a car frame. Because the length of longeron is long and the lower terminal surface is uneven, adopt the lower terminal surface of the longeron of reference seat frock direct support at the frame, there are inaccurate and the detection error is big in the location benchmark.
Disclosure of Invention
The invention provides a method for measuring the planeness of a longitudinal beam of a frame, which is used for solving the problems of inaccurate positioning reference and large detection error caused by the fact that a reference seat tool is directly supported on the lower end surface of the longitudinal beam of a frame to be detected due to the fact that the longitudinal beam is long and the lower end surface is not flat; the invention also provides a frame positioning detection tool, which is suitable for a method for measuring the planeness of the longitudinal beam of the frame to be measured and is used for solving the problems of inaccurate positioning reference and large detection error caused by the fact that the longitudinal beam is long and the lower end surface is not flat and a reference seat tool is directly supported on the lower end surface of the longitudinal beam of the frame to be measured. In order to realize the purpose, the following technical scheme is adopted:
the invention discloses a method for measuring the flatness of a frame longitudinal beam, which adopts the technical scheme that:
the method for measuring the flatness of the frame longitudinal beam comprises the following steps:
(1) wear dress lug location axle in the lug hole of installing the leaf spring on the frame that awaits measuring yet, lug location axle has four at least, and the lug hole of selecting installation lug location axle includes at least: the lifting lug positioning shaft is provided with an inserting shaft section which is detachably, in plug-in fit with the lifting lug hole and coaxially positioned and matched with the lifting lug hole, and a supporting shaft section which is used for supporting on the lifting lug support, and the inserting shaft section and the supporting shaft section of the lifting lug positioning shaft are provided with a uniform positioning axis; the frame to be tested is manufactured according to the requirement that the axis of each lug hole is parallel to the design plane where the upper surface of the longitudinal beam of the frame to be tested is located and has a set distance a, and the distances between the axis of each lug hole of the mounting lug positioning shaft and the design plane where the upper surface of the longitudinal beam of the frame to be tested is a1, a2, a3 and … … an (n is more than or equal to 4);
(2) supporting the frame to be tested on the working platform through a lifting lug positioning shaft; the upper part of the working platform is provided with a measuring reference surface for measuring the distance from the upper surface of the longitudinal beam of the frame to be measured to the measuring reference surface so as to judge the flatness of the upper surface of the longitudinal beam of the frame to be measured; a lifting lug support is arranged on the working platform, and a V-shaped groove for supporting a supporting shaft section of the lifting lug positioning shaft is formed in the upper end of the lifting lug support; the V-shaped grooves form V-shaped positioning structures which are used for positioning the outer circle of the supporting shaft section so that the positioning axis of the lifting lug positioning shaft is parallel to the measuring reference plane and has a set distance b, and the set distances b1, b2, b3 and … … bn (n is more than or equal to 4) between the positioning axis of the lifting lug positioning shaft which is assembled in each V-shaped groove and corresponds to each lifting lug hole in the step (1) and the measuring reference plane are set; each lifting lug positioning shaft in the step (1) is supported in a V-shaped groove in one-to-one correspondence, and the value of b should satisfy: a1+ b1, a2+ b2, a3+ b3, an … …, an bn, L (n is more than or equal to 4), so that a design plane where the upper surface of the longitudinal beam of the frame to be measured is located is parallel to the measurement reference plane, and the distance is a standard value L;
(3) and (3) measuring actual distances between the positions of the measuring reference surface and the upper surface of the longitudinal beam of the frame to be measured by using a measuring tool, judging whether the flatness of the upper surface of the longitudinal beam of the frame to be measured is qualified or not according to an error range between the actual distances and the standard value L in the step (2), judging that the flatness of the upper surface of the longitudinal beam of the frame to be measured at the corresponding position of the frame to be measured is qualified if a difference value between the actual distances and the standard value L is within an error allowable range, and otherwise, judging that the flatness of the upper surface of the longitudinal beam at the corresponding position of the frame to be measured is unqualified.
The method for measuring the flatness of the frame longitudinal beam has the beneficial effects that: the method comprises the steps that a lifting lug positioning shaft is inserted into a lifting lug hole which is formed in a frame and used for mounting a plate spring in a penetrating mode, so that the lifting lug positioning shaft and the lifting lug hole are in detachable plug-in fit and coaxial positioning fit, and the central axis of the lifting lug positioning shaft and the central axis of the lifting lug hole can be approximately considered to be on the same straight line within an error allowable range; the lifting lug positioning shaft is supported and positioned on the V-shaped positioning structure on the lifting lug support, so that the design plane where the upper surface of the longitudinal beam is located is parallel to the measurement reference plane on the working platform. The method utilizes a lifting lug hole for installing a plate spring on a frame to be tested so as to realize the supporting and positioning of the frame to be tested; compared with the prior art in which the lower end surface of the longitudinal beam of the frame to be tested is directly supported by the reference seat tool, the support is firm, and the positioning precision is high. Directly measuring the distance between the upper surface of the frame to be measured and a measurement reference surface by using a measuring tool, comparing the measured value with a standard value L which is parallel to a design plane where the upper surface of the longitudinal beam of the frame to be measured is located, and reflecting whether the flatness of the upper surface of the longitudinal beam of the frame to be measured is qualified or not by judging whether the difference value between the measured value and the design plane is within the error allowable range or not; and if the difference is within the error allowable range, the flatness of the upper surface of the longitudinal beam is qualified, otherwise, the flatness is not qualified. The method is adopted to detect the flatness of the upper surface of the longitudinal beam of the frame to be detected, and is accurate in detection and high in efficiency.
The technical scheme of the frame positioning detection tool comprises the following steps:
the frame positioning detection tool comprises a working platform, wherein the upper part of the working platform is provided with a measuring reference surface for measuring the distance from the upper surface of the longitudinal beam of the frame to be detected to the measuring reference surface so as to judge the flatness of the upper surface of the longitudinal beam of the frame to be detected, and a lifting lug support is arranged on the working platform; the tool further comprises a lifting lug positioning shaft which is detachably arranged in each lifting lug hole of the frame to be tested in a penetrating manner and used for mounting the plate spring; the lifting lug positioning shaft is provided with an inserting shaft section which is detachably, in plug-pull fit with the lifting lug hole and is coaxially positioned and matched with the lifting lug hole, and a supporting shaft section which is used for being supported on the lifting lug support, and the inserting shaft section and the supporting shaft section of the lifting lug positioning shaft are provided with a uniform positioning axis; the upper end of the lifting lug support is provided with a V-shaped groove for supporting a supporting shaft section of the lifting lug positioning shaft; the V-shaped groove forms a V-shaped positioning structure which is used for positioning the outer circle of the supporting shaft section so as to enable the positioning axis of the lifting lug positioning shaft to be parallel to the measuring reference plane and have a set distance b; the lifting lug positioning shafts are at least four and are respectively used for being arranged in two oppositely arranged lifting lug holes of a front suspension and two oppositely arranged lifting lug holes of a rear suspension of the frame to be tested in a penetrating mode.
The vehicle frame positioning detection tool has the beneficial effects that: the positioning detection tool for the frame to be detected comprises a working platform with a measuring reference surface and a lifting lug positioning shaft, wherein the lifting lug positioning shaft is detachably, in plug-pull fit and coaxially positioned and matched with a lifting lug hole for mounting a plate spring on the frame to be detected, and the central shaft of the lifting lug positioning shaft and the central shaft of the lifting lug hole can be approximately considered to be on the same straight line within an error allowable range; the lifting lug positioning shaft is supported and positioned on a V-shaped positioning structure on the lifting lug support, so that a design plane where the upper surface of the longitudinal beam is located is parallel to a measuring reference plane of the working platform, a measuring tool is used for measuring actual distances between a plurality of positions of the measuring reference plane and the upper surface of the longitudinal beam of the frame to be measured, whether the actual distances are within an error range allowed by a theoretical distance or not is judged, whether the flatness of the upper surface of the longitudinal beam of the frame to be measured is qualified or not is judged, and if yes, the flatness of the upper surface of the frame to be measured is qualified; and otherwise, the flatness of the upper surface of the frame to be measured is unqualified. Therefore, the problems that in the prior art, due to the fact that the length of the longitudinal beam is long, the lower end face of the longitudinal beam is not flat, the reference seat tool is directly supported on the lower end face of the longitudinal beam of the frame to be detected, positioning reference is not accurate, and detection errors are large are solved.
Furthermore, the lifting lug support comprises a bottom plate, two vertical plates perpendicular to the bottom plate are arranged at two ends of the bottom plate, the two vertical plates are identical in structure and are arranged in parallel, connecting plates for connecting and fixing the two vertical plates are arranged between the two vertical plates at intervals along the vertical direction, and the V-shaped positioning structure is arranged at one end, far away from the bottom plate, of each vertical plate; the supporting shaft sections of the lifting lug positioning shafts are arranged at two ends of the inserting shaft section; the two supporting shaft sections are respectively supported by the V-shaped positioning structures of the two vertical plates.
Has the advantages that: the lifting lug support is simple and stable in structure, the V-shaped positioning structures at the upper ends of the two vertical plates of the lifting lug support respectively support shaft sections at two ends of the lifting lug positioning shaft, so that a to-be-measured frame is placed stably, and the inclination of the to-be-measured frame is effectively prevented from influencing the measurement precision.
Furthermore, the lifting lug positioning shaft comprises a front suspension front left lifting lug positioning shaft, a front suspension front right lifting lug positioning shaft, a front suspension rear left lifting lug positioning shaft, a front suspension rear right lifting lug positioning shaft, a rear suspension front left lifting lug positioning shaft, a rear suspension front right lifting lug positioning shaft, a rear suspension rear left lifting lug positioning shaft and a rear suspension rear right lifting lug positioning shaft; and the lifting lug support corresponding to the lifting lug positioning shaft comprises a front suspension front left lifting lug support, a front suspension front right lifting lug support, a front suspension rear left lifting lug support, a front suspension rear right lifting lug support, a rear suspension front left lifting lug support, a rear suspension front right lifting lug support, a rear suspension rear left lifting lug support and a rear suspension rear right lifting lug support.
Has the advantages that: the lifting lug positioning shafts and the lifting lug support seats matched with the lifting lug positioning shafts are correspondingly arranged according to different lifting lug holes for mounting the plate spring on the frame to be tested, and a plurality of groups of lifting lug positioning shafts and lifting lug support seats matched with the lifting lug positioning shafts are provided for selective use during use.
Furthermore, a lifting lug support frame for fixing the lifting lug support is arranged on the working platform and comprises a cross beam and a longitudinal beam which are enclosed into a frame structure; the lifting lug support is fixed on the lifting lug support frame through bolts, and long strip-shaped bolt holes for adjusting the bolt fixing positions are formed in the cross beam and/or the longitudinal beam.
Has the advantages that: a cross beam or a longitudinal beam of the lifting lug support frame is provided with a long strip bolt hole for adjusting the fixing position of the bolt; and adjusting the mounting position of the lifting lug support on the working platform to enable the frame to be detected to be positioned and detected to be suitable for detection of frames with different sizes.
Further, the measuring reference surface is the upper surface of the working platform.
Has the advantages that: the measuring reference surface is the upper surface of the working platform, and the measuring device has a simple structure and is convenient for measuring the distance between the upper surface of the longitudinal beam of the frame to be measured and the measuring reference surface.
Drawings
FIG. 1 is a schematic diagram of the implementation 1 of the method for measuring the flatness of the longitudinal beam of the frame and the tool for positioning and detecting the frame of the invention in cooperation with the frame;
FIG. 2 is a front view of the embodiment 1 of the method for measuring the flatness of the frame rail and the frame positioning and detecting tool of the present invention in cooperation with a frame;
FIG. 3 is a top view of the embodiment 1 of the method for measuring the flatness of the frame rail and the frame positioning and detecting tool of the present invention in cooperation with a frame;
FIG. 4 is a left side view of the frame rail flatness measuring method and frame positioning detection tool of the present invention during the matching of embodiment 1 and the frame;
FIG. 5 is a schematic view of the frame rail flatness measurement method of the present invention (partial view at A);
in the figure: 1-front suspension front right lifting lug positioning shaft, 2-to-be-measured vehicle frame, 3-front suspension rear right lifting lug positioning shaft, 4-rear suspension front right lifting lug positioning shaft, 5-rear suspension rear right lifting lug positioning shaft, 6-front suspension front right lifting lug support, 7-front suspension lifting lug support frame, 8-front suspension rear right lifting lug support, 9-rear suspension front right lifting lug support, 10-rear suspension lifting lug support frame, 11-rear suspension rear right lifting lug support, 12-working platform, A-design plane and B-measurement reference plane.
Detailed Description
The following description will further describe embodiments of the present invention with reference to the accompanying drawings, but the present invention is not limited thereto.
The matching schematic diagram of the embodiment 1 of the vehicle frame positioning detection tool and the vehicle frame 2 to be detected is shown in fig. 1 to 4, the vehicle frame positioning detection tool comprises a working platform 12, the upper surface of the working platform 12 is a measurement reference surface B, in other embodiments, under the premise that the measurement requirement is met, a support is arranged on the upper portion of the working platform 12, and the measurement reference surface is formed on the upper surface of the support. A lifting lug support frame for fixing the lifting lug support is arranged on the working platform 12; the lower end of the lifting lug support is fixedly connected to the lifting lug support frame through bolts. This frame location detects frock still including being used for the detachable dress to be used for installing the lug location axle in each lug hole of leaf spring on frame 2 that awaits measuring, lug location axle is supported the location by the upper end of lug support.
The lug location axle has and is used for with the frame 2 that awaits measuring on be used for installing the removable plug cooperation of lug hole and coaxial positioning fit's of leaf spring insert the distribution shaft section, a support shaft section for supporting on the lug support, the distribution shaft section of inserting of lug location axle has unified location axis with the support shaft section, in this embodiment, insert the removable plug cooperation of distribution shaft section and lug hole and for the excessive cooperation that can satisfy the axiality of "shaft hole cooperation", of course insert the clearance fit that the distribution shaft section can also satisfy the axiality of "shaft hole cooperation" with the removable plug cooperation of lug hole in the within range that the error allows in other embodiments. In this embodiment, the lifting lug positioning shaft includes 2 sections of supporting shaft sections and 1 section of inserting shaft section, and the supporting shaft sections are arranged at two ends of the inserting shaft section; of course, in the embodiment, the lifting lug positioning shaft may further include 1 supporting shaft section and 2 inserting shaft sections, wherein the inserting shaft sections are disposed at two ends of the supporting shaft section. The number of the lifting lug positioning shafts is at least 4, the number of the lifting lug positioning shafts is 8, and the lifting lug positioning shafts are respectively corresponding to a front left lifting lug positioning shaft of the front suspension, a front right lifting lug positioning shaft 1 of the front suspension, a rear left lifting lug positioning shaft of the front suspension, a rear right lifting lug positioning shaft 3 of the front suspension, a front left lifting lug positioning shaft of the rear suspension, a front right lifting lug positioning shaft 4 of the rear suspension, a rear left lifting lug positioning shaft of the rear suspension and a rear right lifting lug positioning shaft 5 of the rear suspension.
The lifting lug support frame comprises a cross beam and a longitudinal beam, wherein the cross beam is enclosed into a frame structure, the longitudinal beam is welded with the cross beam, and the lifting lug support frame comprises a front suspension lifting lug support frame 7 and a rear suspension lifting lug support frame 10; the cross beam and the longitudinal beam of the lifting lug support frame are fixed on the working platform 12 through bolts, and in other embodiments, the lifting lug support frame can also be fixed on the working platform in other modes such as welding or clamping. The cross beam and the longitudinal beam are simultaneously provided with strip-shaped bolt holes for adjusting the bolt fixing positions, and in other embodiments, the cross beam or the longitudinal beam can be only provided with strip-shaped bolt holes for adjusting the bolt fixing positions.
The lifting lug support comprises a bottom plate, two vertical plates perpendicular to the bottom plate are arranged at two ends of the bottom plate, the two vertical plates are fixedly connected with the bottom plate in a welding mode, the lower end faces of the vertical plates and the lower end face of the bottom plate are on the same plane, the two vertical plates are arranged in the same and parallel mode, and connecting plates used for connecting and fixing the two vertical plates are arranged between the two vertical plates along the vertical direction at intervals. The upper ends of the two vertical plates are provided with V-shaped grooves for supporting the supporting shaft sections of the lifting lug positioning shafts, and the V-shaped grooves form V-shaped positioning structures which are used for positioning the outer circles of the supporting shaft sections so that the positioning axes of the lifting lug positioning shafts are parallel to the measuring reference plane B and have set intervals. The positioning datum of the V-shaped positioning structure is used for inspecting the central axis of a workpiece to be measured placed on the V-shaped positioning structure, the positioning plane of the V-shaped positioning structure and the excircle contact bus of the workpiece to be measured are used as positioning datum, and the two positioning datum planes are used for realizing correct positioning of the workpiece to be measured under the co-positioning action. When the size of the excircle of the lifting lug positioning shaft is determined, the positioning axis of the lifting lug positioning shaft is determined. The V-shaped positioning structure is adopted for positioning, which belongs to the conventional technical means in the prior art. The value B is the distance between the positioning axis of the lifting lug positioning shaft and the measurement reference plane B; the value a is the distance between the positioning axis of the lifting lug positioning shaft and the plane of the design plane A where the upper surface of the longitudinal beam of the frame 2 to be measured is located. The lifting lug support supports and positions the corresponding lifting lug positioning shaft through the V-shaped positioning structures of the two vertical plates, and in the embodiment, the lifting lug support comprises a front left lifting lug support of the front suspension, a front right lifting lug support 6 of the front suspension, a rear left lifting lug support of the front suspension, a rear right lifting lug support 8 of the front suspension, a front left lifting lug support of the rear suspension, a front right lifting lug support 9 of the rear suspension, a rear left lifting lug support of the rear suspension and a rear right lifting lug support 11 of the rear suspension; are respectively used for supporting and positioning the corresponding lifting lug positioning shafts.
The embodiment of the flatness measuring method for the longitudinal beam of the frame to be measured specifically adopts the embodiment of the frame positioning detection tool to realize the flatness measuring method for the longitudinal beam of the frame 2 to be measured, and comprises the following steps:
(1) 8 lifting lug holes are designed on the frame 2 to be tested, and the lifting lug holes are used for hinging and mounting vehicle leaf springs during vehicle assembly; corresponding lifting lug holes are selected on the frame 2 to be tested, the number of the selected lifting lug holes is at least four, at least two lifting lug holes are respectively selected on the front suspension and the rear suspension of the frame 2 to be tested, the number of the selected lifting lug holes is 8 in the embodiment, corresponding lifting lug positioning shafts penetrate through the lifting lug holes, and the lifting lug positioning shafts are overlapped with the central axes of the corresponding lifting lug holes within the error influence range. When the frame 2 to be tested is manufactured, the central axis of each lug hole is parallel to a design plane A where the upper surface of the longitudinal beam of the frame 2 to be tested is located, and the design plane A has set distances a1, a2, a3 and a4 … … a8, and the lug positioning shafts are respectively a front left lug positioning shaft of the front suspension, a front right lug positioning shaft 1 of the front suspension, a rear left lug positioning shaft of the front suspension, a rear right lug positioning shaft 3 of the front suspension, a front left lug positioning shaft of the rear suspension, a front right lug positioning shaft 4 of the rear suspension, a rear left lug positioning shaft of the rear suspension and a rear right lug positioning shaft 5 of the rear suspension. The lifting lug positioning shaft is provided with an inserting shaft section which is matched with the lifting lug hole in a detachable plug-pull mode and is coaxially positioned and matched with the lifting lug hole, and a supporting shaft section which is used for supporting on the lifting lug support, and the inserting shaft section and the supporting shaft section of the lifting lug positioning shaft are provided with a unified positioning axis.
(2) And adjusting the fixed position of the lifting lug positioning seat on the lifting lug support frame, and supporting the frame 2 to be measured on the working platform 12 through the lifting lug positioning shaft arranged in the lifting lug hole in a penetrating manner. The lug hole and the inserting and matching shaft section of the corresponding lug positioning shaft adopt the excessive matching of the coaxiality of 'shaft hole matching'. The support shaft sections at the two ends of the lifting lug positioning shaft are supported and positioned in V-shaped grooves at the upper ends of the corresponding lifting lug positioning seats, and the V-shaped grooves form V-shaped positioning structures which are used for positioning the outer circles of the support shaft sections so that the positioning axis of the lifting lug positioning shaft is parallel to the measurement reference plane B and has a set distance B. The lifting lug support corresponding to the lifting lug positioning shaft comprises a front suspension front left lifting lug support, a front suspension front right lifting lug support 6, a front suspension rear left lifting lug support, a front suspension rear right lifting lug support 8, a rear suspension front left lifting lug support, a rear suspension front right lifting lug support 9, a rear suspension rear left lifting lug support and a rear suspension rear right lifting lug support 11. The lifting lug positioning seat is fixed on the working platform 12 through a lifting lug support frame, the lifting lug positioning seat is fixed on the lifting lug support frame through a bolt, and the lifting lug support frame is directly fixed on the working platform 12. The upper part of the working platform 12 is provided with a measuring reference surface B, and the measuring reference surface B is the upper surface of the working platform 12 and is used for judging the flatness of the upper surface of the longitudinal beam of the frame 2 to be detected by the distance from the upper surface of the longitudinal beam of the frame 2 to be detected to the measuring reference surface B. The principle of the measuring method is shown in fig. 5, and the set distances between the positioning axis of the lifting lug positioning shaft corresponding to each lifting lug hole in the step (1) and the measuring reference plane B are B1, B2, B3 and B4 … … B8; each lifting lug positioning shaft in the step (1) is supported in a V-shaped groove in one-to-one correspondence, and the value of b should satisfy: and a1+ B1, a2+ B2, a3+ B3, a4+ B4, … …, a8+ B8, and the distance between the design plane a where the upper surface of the longitudinal beam of the frame 2 to be measured is parallel to the measurement reference plane B and is a standard value L.
(3) And (3) measuring actual distances between a plurality of positions of the upper surface of the longitudinal beam of the frame 2 to be measured and the measuring reference surface B by using a measuring tool, judging whether the flatness of the upper surface of the longitudinal beam of the frame 2 to be measured is qualified or not according to whether the difference value between the actual distances and the standard value L in the step (2) is within an error allowable range or not, judging that the flatness of the upper surface of the longitudinal beam of the frame 2 to be measured is qualified or not, and otherwise, judging that the flatness of the upper surface of the longitudinal beam of the frame 2 to be measured is unqualified.
In other embodiments of the vehicle frame positioning detection tool, the lifting lug support comprises a bottom plate, a vertical plate perpendicular to the bottom plate is arranged in the middle of the upper end face of the bottom plate, a V-shaped groove for supporting a supporting shaft section of the lifting lug positioning shaft is arranged at the upper end of the vertical plate, and the V-shaped groove forms a V-shaped positioning structure which is used for positioning the outer circle of the supporting shaft section so that the positioning axis of the lifting lug positioning shaft is parallel to the measurement reference plane and has a set distance.
Claims (6)
1. A method for measuring the flatness of a frame longitudinal beam is characterized by comprising the following steps: the method comprises the following steps:
(1) wear dress lug location axle in the lug hole of installing the leaf spring on the frame that awaits measuring yet, lug location axle has four at least, and the lug hole of selecting installation lug location axle includes at least: the lifting lug positioning shaft is provided with an inserting shaft section which is detachably, in plug-in fit with the lifting lug hole and coaxially positioned and matched with the lifting lug hole, and a supporting shaft section which is used for supporting on the lifting lug support, and the inserting shaft section and the supporting shaft section of the lifting lug positioning shaft are provided with a uniform positioning axis; the frame to be tested is manufactured according to the requirement that the axis of each lug hole is parallel to the design plane where the upper surface of the longitudinal beam of the frame to be tested is located and has a set distance a, and the distances between the axis of each lug hole of the mounting lug positioning shaft and the design plane where the upper surface of the longitudinal beam of the frame to be tested is a1, a2, a3 and … … an (n is more than or equal to 4);
(2) supporting the frame to be tested on the working platform through a lifting lug positioning shaft; the upper part of the working platform is provided with a measuring reference surface for measuring the distance from the upper surface of the longitudinal beam of the frame to be measured to the measuring reference surface so as to judge the flatness of the upper surface of the longitudinal beam of the frame to be measured; a lifting lug support is arranged on the working platform, and a V-shaped groove for supporting a supporting shaft section of the lifting lug positioning shaft is formed in the upper end of the lifting lug support; the V-shaped grooves form V-shaped positioning structures which are used for positioning the outer circle of the supporting shaft section so that the positioning axis of the lifting lug positioning shaft is parallel to the measuring reference plane and has a set distance b, and the set distances b1, b2, b3 and … … bn (n is more than or equal to 4) between the positioning axis of the lifting lug positioning shaft which is assembled in each V-shaped groove and corresponds to each lifting lug hole in the step (1) and the measuring reference plane are set; each lifting lug positioning shaft in the step (1) is supported in a V-shaped groove in one-to-one correspondence, and the value of b should satisfy: a1+ b1, a2+ b2, a3+ b3, an … …, an bn, L (n is more than or equal to 4), so that a design plane where the upper surface of the longitudinal beam of the frame to be measured is located is parallel to the measurement reference plane, and the distance is a standard value L;
(3) and (3) measuring actual distances between the positions of the measuring reference surface and the upper surface of the longitudinal beam of the frame to be measured by using a measuring tool, judging whether the flatness of the upper surface of the longitudinal beam of the frame to be measured is qualified or not according to an error range between the actual distances and the standard value L in the step (2), judging that the flatness of the upper surface of the longitudinal beam of the frame to be measured at the corresponding position of the frame to be measured is qualified if a difference value between the actual distances and the standard value L is within an error allowable range, and otherwise, judging that the flatness of the upper surface of the longitudinal beam at the corresponding position of the frame to be measured is unqualified.
2. A frame positioning detection tool is used for implementing the frame longitudinal beam flatness measuring method of claim 1, and comprises a working platform, wherein the upper part of the working platform is provided with a measuring reference surface used for measuring the distance from the upper surface of a frame longitudinal beam to be measured to the measuring reference surface so as to judge the flatness of the upper surface of the frame longitudinal beam to be measured, and the frame positioning detection tool is characterized in that: the working platform is provided with a lifting lug support; the tool further comprises a lifting lug positioning shaft which is detachably arranged in each lifting lug hole of the frame to be tested in a penetrating manner and used for mounting the plate spring; the lifting lug positioning shaft is provided with an inserting shaft section which is detachably, in plug-pull fit with the lifting lug hole and is coaxially positioned and matched with the lifting lug hole, and a supporting shaft section which is used for being supported on the lifting lug support, and the inserting shaft section and the supporting shaft section of the lifting lug positioning shaft are provided with a uniform positioning axis; the upper end of the lifting lug support is provided with a V-shaped groove for supporting a supporting shaft section of the lifting lug positioning shaft; the V-shaped groove forms a V-shaped positioning structure which is used for positioning the outer circle of the supporting shaft section so as to enable the positioning axis of the lifting lug positioning shaft to be parallel to the measuring reference plane and have a set distance b; the lifting lug positioning shafts are at least four and are respectively used for being arranged in two oppositely arranged lifting lug holes of a front suspension and two oppositely arranged lifting lug holes of a rear suspension of the frame to be tested in a penetrating mode.
3. The frame location detection tool of claim 2, characterized in that: the lifting lug support comprises a bottom plate, two vertical plates perpendicular to the bottom plate are arranged at two ends of the bottom plate, the two vertical plates are identical in structure and are arranged in parallel, connecting plates for connecting and fixing the two vertical plates are arranged between the two vertical plates at intervals along the vertical direction, and the V-shaped positioning structure is arranged at one end, far away from the bottom plate, of each vertical plate; the supporting shaft sections of the lifting lug positioning shafts are arranged at two ends of the inserting shaft section; the two supporting shaft sections are respectively supported by the V-shaped positioning structures of the two vertical plates.
4. The frame location detection tool of claim 3, characterized in that: the lifting lug positioning shaft comprises a front suspension front left lifting lug positioning shaft, a front suspension front right lifting lug positioning shaft, a front suspension rear left lifting lug positioning shaft, a front suspension rear right lifting lug positioning shaft, a rear suspension front left lifting lug positioning shaft, a rear suspension front right lifting lug positioning shaft, a rear suspension rear left lifting lug positioning shaft and a rear suspension rear right lifting lug positioning shaft; and the lifting lug support corresponding to the lifting lug positioning shaft comprises a front suspension front left lifting lug support, a front suspension front right lifting lug support, a front suspension rear left lifting lug support, a front suspension rear right lifting lug support, a rear suspension front left lifting lug support, a rear suspension front right lifting lug support, a rear suspension rear left lifting lug support and a rear suspension rear right lifting lug support.
5. The frame location detection tool according to any one of claims 2-4, characterized in that: the working platform is provided with a lifting lug support frame for fixing the lifting lug support, and the lifting lug support frame comprises a cross beam and a longitudinal beam which are enclosed into a frame structure; the lifting lug support is fixed on the lifting lug support frame through bolts, and long strip-shaped bolt holes for adjusting the bolt fixing positions are formed in the cross beam and/or the longitudinal beam.
6. The frame location detection tool according to any one of claims 2-4, characterized in that: the measuring reference surface is the upper surface of the working platform.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811604717.1A CN111366122A (en) | 2018-12-26 | 2018-12-26 | Frame longitudinal beam flatness measuring method and frame positioning detection tool |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811604717.1A CN111366122A (en) | 2018-12-26 | 2018-12-26 | Frame longitudinal beam flatness measuring method and frame positioning detection tool |
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| CN111366122A true CN111366122A (en) | 2020-07-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811604717.1A Pending CN111366122A (en) | 2018-12-26 | 2018-12-26 | Frame longitudinal beam flatness measuring method and frame positioning detection tool |
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| CN (1) | CN111366122A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112556541A (en) * | 2020-11-20 | 2021-03-26 | 昌河飞机工业（集团）有限责任公司 | Measuring tool and measuring and processing method for rotator fork lug bushing |
| CN113203345A (en) * | 2021-04-27 | 2021-08-03 | 安徽江淮汽车集团股份有限公司 | Detection tool and detection method |
| CN114346670A (en) * | 2022-01-27 | 2022-04-15 | 中国船舶重工集团公司第七0三研究所无锡分部 | Underframe structure for mounting marine gas turbine and centering mounting method |
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2018
- 2018-12-26 CN CN201811604717.1A patent/CN111366122A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112556541A (en) * | 2020-11-20 | 2021-03-26 | 昌河飞机工业（集团）有限责任公司 | Measuring tool and measuring and processing method for rotator fork lug bushing |
| CN113203345A (en) * | 2021-04-27 | 2021-08-03 | 安徽江淮汽车集团股份有限公司 | Detection tool and detection method |
| CN114346670A (en) * | 2022-01-27 | 2022-04-15 | 中国船舶重工集团公司第七0三研究所无锡分部 | Underframe structure for mounting marine gas turbine and centering mounting method |
| CN114346670B (en) * | 2022-01-27 | 2023-08-11 | 中国船舶重工集团公司第七0三研究所无锡分部 | Underframe structure for marine gas turbine installation and centering installation method |
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