CN111366121B - Method for recovering precision of old welding fixture - Google Patents
Method for recovering precision of old welding fixture Download PDFInfo
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- CN111366121B CN111366121B CN202010146168.9A CN202010146168A CN111366121B CN 111366121 B CN111366121 B CN 111366121B CN 202010146168 A CN202010146168 A CN 202010146168A CN 111366121 B CN111366121 B CN 111366121B
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- clamp
- pin
- coordinate system
- fixture
- reference pin
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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
- G01B21/20—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 contours or curvatures, e.g. determining profile
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
- B23K37/04—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups for holding or positioning work
- B23K37/0426—Fixtures for other work
- B23K37/0435—Clamps
- B23K37/0443—Jigs
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Vehicle Cleaning, Maintenance, Repair, Refitting, And Outriggers (AREA)
Abstract
The invention is used for recovering the precision of an old welding fixture, particularly relates to the precision recovery of the old welding fixture in the automobile industry, belongs to the technical field of tool maintenance, and provides a method for recovering the precision of the old welding fixture.
Description
Technical Field
The invention relates to a method for recovering the precision of an old welding fixture, in particular to a method for recovering the precision of an old welding fixture in the automobile industry, and belongs to the technical field of tool maintenance.
Background
The welding fixture in the automobile industry is influenced by gravity, stress, cold and hot temperature difference, welding spatter, welding gun collision and the like in the using process, and the structure, the precision and the like of the fixture are influenced. In the long-term use process, the clamp base plate is deformed, the measuring reference is invalid, the reference precision loss and other conditions cannot be avoided, the precision measurement and the daily monitoring of the clamp cannot be normally carried out, and further the welding precision of a vehicle body is low, the assembly and the appearance perception quality of the whole vehicle are influenced, and even the performance of the whole vehicle is influenced.
In order to solve the above problems, the following two methods are mainly used in the prior art: 1. the fixture is adaptively used according to the problem of the whole vehicle, and is adjusted and monitored according to inaccurate measured values, so that various uncontrollable variable factors exist, and the product quality is difficult to effectively and stably ensure. 2. The fixture is reproduced and remanufactured in a manner that requires a large amount of additional investment.
Therefore, in the field of existing tool maintenance technologies, especially in tool maintenance in the automobile industry, a method for recovering the precision of an old welding fixture is urgently needed.
Disclosure of Invention
The invention aims to solve the problems in the prior art and provides a method for recovering the precision of an old welding fixture, which reconstructs a detection reference system of the fixture on the basis of the conditions of old fixture, three-dimensional digital-analog deficiency, substrate deformation, failure of an original detection system and the like, realizes the measurability and adjustability of the old fixture, can control based on the capacity, ensures the quality of a finished automobile and prolongs the service life of the fixture.
In order to achieve the technical purpose and achieve the technical effect, the invention is realized by the following technical scheme:
a method for recovering the precision of an old welding fixture is characterized by comprising the following steps:
1) selecting main reference pin and auxiliary reference pin
Selecting a main reference pin and an auxiliary reference pin on a clamp, wherein the two pins are distributed on the clamp; constructing a space coordinate system A by using an original detection system on a clamp; in a space coordinate system A, measuring a main reference pin and an auxiliary reference pin, and adjusting theoretical values according to the measured values to ensure that the deviation in the X/Y/Z directions is controlled within +/-0.05 mm; the purpose of the step is to ensure the relative position relation of the two pins as much as possible and ensure the precision of the main reference pin and the auxiliary reference pin of the part on the clamp;
2) newly added detection reference block
Newly adding a detection reference block on a clamp, constructing a space coordinate system B by using a main reference pin and an auxiliary reference pin, measuring the newly added detection reference block in the space coordinate system B by using three-coordinate measuring equipment, and taking a measured value as a theoretical value of the newly added detection reference block;
the detection reference block is provided with a positioning pin mounting hole, a bolt hole, a reference hole and a threaded hole;
3) building a process file
Reversely constructing a process file of a three-dimensional digital-analog of the clamp by using three-dimensional data of a product, and simulating theoretical positions of all reference pins and reference surfaces on the clamp and structural forms of measured elements;
4) constructing and measuring a spatial coordinate system C
Importing the process file into measurement software, and constructing a space coordinate system C by using a new detection reference block in a fitting or iterative system establishing mode; measuring a reference pin and a reference plane on the fixture in a space coordinate system C, and directly comparing the measured element values with the element values in the process file to generate measured element deviation values;
5) adjustment of
Adjusting the reference pin and the reference surface of the clamp according to the deviation value of the measurement element to finish the precision recovery of the clamp; and measuring and monitoring the clamp by using the newly added detection reference block and the process file.
Compared with the prior art, the invention has the beneficial effects that:
the invention can rebuild the detection reference system of the clamp by using a new technical scheme on the basis of the existing conditions of clamp aging, three-dimensional digital-analog loss, base plate deformation, failure of the original detection system and the like, realizes the measurability, adjustability and capability-based control of the old clamp, prolongs the service life of the clamp while ensuring the quality of the whole vehicle, and has the same guiding significance for other types of tools.
Drawings
FIG. 1 is a schematic diagram of a detection reference block structure;
FIG. 2 is a schematic view of a DAS04 station clamp process file;
the clamp comprises a clamp base, a clamp base pin and a clamp base, wherein the clamp base comprises 5-mounting holes, 6-bolt holes, 7-reference holes, 8-threaded holes, 9-clamp reference pins and 10-clamp reference surfaces.
Detailed Description
The invention is further illustrated below with reference to the accompanying drawings:
the technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. The following examples are presented merely to further understand and practice the present invention and are not to be construed as further limiting the claims of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, where terms are involved, such as: the directional or positional relationships indicated by "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., are based on the directional or positional relationships shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the device or part (element) referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the description of the present invention, it should be noted that unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; the two elements can be directly connected or indirectly connected through an intermediate medium, and the two elements can be communicated with each other internally, and can be flexibly connected, rigidly connected or movably connected. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The flatness of an existing old DAS04 station clamp is 0.34mm and exceeds the requirement of the flatness by 0.1mm, the variation of a measured value is greatly over 0.5mm when the same reference pin on the clamp is measured for multiple times, and the normal use requirement cannot be met, and precision repair needs to be carried out through the technical scheme provided by the invention, and the specific steps are as follows:
1) selecting main reference pin and auxiliary reference pin
Selecting a main reference pin and an auxiliary reference pin on a clamp; constructing a space coordinate system A on a reference cross groove of an original clamp, measuring a main reference pin and an auxiliary reference pin after the space coordinate system A is constructed, and adjusting theoretical values according to measurement results to ensure that the deviation of evaluation elements in Y & Z directions is within +/-0.05 mm;
in the process of constructing the spatial coordinate system a, considering the influences of substrate deformation, serious detection reference abrasion and the like, for example, the spatial coordinate system constructed in a 3&2&1 system construction mode has a large error, and the measurement value of the reference pin may deviate from the spectrum or have no regularity. Therefore, in order to reduce measurement errors as much as possible and construct a more accurate space coordinate system based on the current situation, when a plane is constructed, a plurality of point elements are uniformly collected on the substrate, the overall situation of several shifts is simulated, and the influence caused by local deformation of the substrate is reduced.
2) Newly added detection reference block
Newly adding four detection reference blocks on a DAS04 station fixture, then constructing a space coordinate system B by using a main reference pin and an auxiliary reference pin, measuring the newly added four detection reference blocks 4 according to circle characteristics by using three-coordinate measuring equipment under the space coordinate system B, and taking the measured values as theoretical values of the newly added detection reference blocks, wherein the measuring results are as follows:
referring to fig. 1, a positioning pin mounting hole 5, a bolt hole 6, a reference hole 7 and a threaded hole 8 are formed in the detection reference block, and the positioning pin mounting hole 5, the bolt hole 6 and the threaded hole 8 are symmetrically arranged on two sides of the reference hole 7; the positioning pin mounting hole 5 is connected with the clamp substrate through a positioning pin and used for ensuring the stable position relation between the reference block and the clamp substrate; the bolt hole 6 is connected with the clamp base plate through a bolt and used for fixing the reference block and the clamp base plate; the threaded hole 8 is connected with the reference block cover plate through a bolt;
reversely constructing a process file of a three-dimensional digital-analog of the clamp by using three-dimensional data of a product, and simulating theoretical positions of all reference pins and reference surfaces on the clamp and structural forms of measured elements; referring to fig. 2, in the process file of the DAS04 station jig, a jig reference pin 9 and a jig reference plane 10 are selected;
4) constructing and measuring a spatial coordinate system C
Importing the process file into measurement software, constructing a space coordinate system C by using a new detection reference block in a fitting or iterative system construction mode, measuring a fixture reference pin 9 and a fixture reference surface 10 under the space coordinate system C, and directly comparing the measured element values with the element values in the process file to generate measured element deviation values;
5) adjustment of
Adjusting the fixture reference pin 9 and the fixture reference surface 10 according to the measurement element deviation value to finish the fixture precision recovery, wherein the monitoring data after the precision recovery of the fixture reference pin 9 and the fixture reference surface 10 at the DAS04 station are as follows:
the clamp is measured and monitored by utilizing the newly added detection reference block 4 and the process file subsequently, the restored clamp reaches the original precision, the service life of the clamp is prolonged while the quality of the whole vehicle is ensured, and the additional cost of re-investment of the clamp is reduced.
While embodiments of the invention have been disclosed above, it is not intended to be limited to the uses set forth in the specification and examples. It can be applied to all kinds of fields suitable for the present invention. Additional modifications will readily occur to those skilled in the art. It is therefore intended that the invention not be limited to the exact details and illustrations described and illustrated herein, but fall within the scope of the appended claims and equivalents thereof.
Claims (1)
1. A method for recovering the precision of an old welding fixture is characterized by comprising the following steps:
comprises the following steps of (a) carrying out,
1) selecting main reference pin and auxiliary reference pin
Selecting a main reference pin and an auxiliary reference pin on a clamp, wherein the two pins are distributed on the clamp; constructing a space coordinate system A by using an original detection system on a clamp; in a space coordinate system A, measuring a main reference pin and an auxiliary reference pin, and adjusting the deviation value of the main reference pin and the auxiliary reference pin by taking a theoretical value as a target according to a measured value to ensure that the deviation in the X/Y/Z directions is controlled within +/-0.05 mm;
2) newly added detection reference block
Newly adding a detection reference block on a clamp, constructing a space coordinate system B by using a main reference pin and an auxiliary reference pin, measuring the newly added detection reference block in the space coordinate system B by using three-coordinate measuring equipment, and taking a measured value as a theoretical value of the newly added detection reference block; and the detection reference block is provided with a positioning pin mounting hole, a bolt hole, a reference hole and a threaded hole.
3) Building a process file
Reversely constructing a process file of a three-dimensional digital-analog of the clamp by using three-dimensional data of a product, and simulating theoretical positions of all reference pins and reference surfaces on the clamp and structural forms of measured elements;
4) constructing and measuring a spatial coordinate system C
Importing the process file into measurement software, constructing a space coordinate system C by using a new detection reference block in a fitting or iterative system building mode, measuring a fixture reference pin and a fixture reference surface in the space coordinate system C, and directly comparing the measured element values with the element values in the process file to generate measured element deviation values;
5) adjustment of
And adjusting the fixture reference pin and the fixture reference surface according to the measurement element deviation value, and subsequently measuring and monitoring the fixture by using the newly added detection reference block and the process file.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010146168.9A CN111366121B (en) | 2020-03-05 | 2020-03-05 | Method for recovering precision of old welding fixture |
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| CN202010146168.9A CN111366121B (en) | 2020-03-05 | 2020-03-05 | Method for recovering precision of old welding fixture |
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| CN111366121A CN111366121A (en) | 2020-07-03 |
| CN111366121B true CN111366121B (en) | 2021-10-08 |
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| CN113959388A (en) * | 2021-09-30 | 2022-01-21 | 中国第一汽车股份有限公司 | Main welding line trolley consistency detection method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| DE10048000B4 (en) * | 1999-09-26 | 2004-04-22 | Bernd Kempkens | Devices, methods and system elements for welding and / or sealing floor coverings |
| CN101398299B (en) * | 2007-09-29 | 2010-11-24 | 宝山钢铁股份有限公司 | Method and device for measuring rebound of sheet bending member |
| CN101524774B (en) * | 2009-03-18 | 2010-09-29 | 四川德恩机械有限责任公司 | Technological method for milling long rack tooth form |
| CN101524805B (en) * | 2009-04-10 | 2011-03-16 | 南京航空航天大学 | Method for manufacturing three-dimensional flow enclosed-type impeller inter-impeller passage and special clamp thereof |
| CN102798329B (en) * | 2012-08-09 | 2014-11-26 | 安徽江淮汽车股份有限公司 | Clamp accuracy detection device for vehicle body assembly station |
| CN103753081B (en) * | 2013-12-20 | 2016-02-24 | 柳州市骏信金属制品有限责任公司 | Automobile instrument panel support welding clamp |
| NL1041084B9 (en) * | 2014-12-08 | 2017-06-19 | Iac Geometrische Ingenieurs B V | A method and apparatus for quickly and accurately centering and clamping both cylindrical and conical objects such as gauges, smooth or threaded, internally and externally, for accurately measuring in particular outer diameters, core diameters and flank diameters using a known 2-dimensional scanning measuring machine. |
| CN104985289B (en) * | 2015-07-31 | 2017-04-12 | 华南理工大学 | Laser sensor-based welding seam automatic tracking test device and test method thereof |
| CN205270947U (en) * | 2015-12-14 | 2016-06-01 | 浙江吉利罗佑发动机有限公司 | Anchor clamps accuracy adjustment calibrating device |
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