Auxiliary device for measuring overall dimension of workpiece and measuring method

Abstract

The invention relates to the technical field of workpiece measurement, in particular to an auxiliary device for measuring the overall dimension of a workpiece and a measurement method, the auxiliary device comprises a base, positioning blocks are arranged on the two sides of the base, meter alignment pins and a plurality of hook head pressing plates are arranged on the positioning blocks, and flat plates are clamped between the hook head pressing plates and the positioning blocks. Wherein the base provides support for the whole auxiliary device, the positioning block is matched with the hook head pressing plate to clamp and fix the flat plate, the flatness of the flat plate meets the measurement standard by adjusting the levelness of the flat plate, and a foundation is provided for measurement of a workpiece; the gauge setting pin arranged on the positioning block provides a reliable reference point for zero calibration of the contact pin type dial indicator, and in the zero calibration process, the contact pin type dial indicator is subjected to zero calibration on the gauge setting pin, so that errors of the measuring instrument can be eliminated, and the accuracy of measured data is ensured. The auxiliary device is simple in structure and easy to operate, and solves the problem that mechanical measurement in the prior art cannot meet the overall dimension measurement of the flexible material.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of workpiece measurement, in particular to a kind of auxiliary device and measurement method for measuring workpiece profile size. BACKGROUND

[0002] In modern industrial production system, workpiece processing and measurement are two closely connected and essential links. The precision and quality of workpiece processing directly determine the performance and reliability of products, and accurate measurement is the key means to ensure that workpieces meet design requirements and guarantee product quality stability. With the rapid development of science and technology and the increasingly fierce market competition, the quality requirements of workpieces in various industries are becoming more and more stringent. Not only is it pursued that workpieces have excellent performance, but also high standards are put forward for their dimensional accuracy, shape accuracy and surface quality. From a macro perspective, global manufacturing industry is in a critical period of transformation and upgrading, and intelligentization, automation and precision have become the mainstream trend of manufacturing development. Under this background, workpiece processing technology is constantly innovating, and advanced processing equipment and technology are emerging in an endless stream, which has significantly improved the processing precision and complexity of workpieces. However, the improvement of processing precision does not mean the inevitable improvement of product quality, because accurate measurement is the only way to verify whether the processing result meets the design requirements. Only through accurate measurement can problems existing in the processing process be found in time. Different industries have diverse demands for workpiece measurement.

[0003] Rubber parts and other flexible materials have unique elasticity, wear resistance, corrosion resistance and good sealing properties, and have irreplaceable application value in many fields such as transportation, industrial machinery, electronics, medical health, construction, aerospace, consumer electronics and fashion wear. Rubber seals play a crucial role in aerospace equipment, and they are widely used in key parts such as aircraft engines, fuel systems and hydraulic systems to effectively prevent gas or liquid leakage and ensure the normal operation of equipment and flight safety. For example, the sealing strip around the aircraft window is usually made of ethylene-propylene-diene rubber or silicone rubber, which can maintain good elasticity and sealing performance in extreme temperature range; cabin door sealing strip uses high-performance silicone rubber or fluororubber to ensure that cabin pressure does not leak, and the measurement of rubber part profile has become an important part of aerospace manufacturing industry.

[0004] At present, in view of the demand for small workpiece size fluctuation and multi-point measurement, there are mainly two mainstream technical means of mechanical measurement and optical measurement. As an advanced non-contact measurement method, optical measurement technology has been widely used in high-end manufacturing field due to its unique advantages. Optical measuring instrument usually uses the propagation characteristics of light, such as interference, diffraction, laser scanning and other principles, to obtain the size information of the workpiece. This measurement method has many obvious advantages. First, the measurement size precision is extremely high, which can reach microns or even nanometers, and can meet the measurement demand of high-precision workpiece. Secondly, the efficiency of optical measurement is very high, which can complete the measurement of multiple points of workpiece in a short time, greatly shortens the measurement period and improves the production efficiency. In addition, since optical measurement is non-contact, it will not cause any damage to the surface of the workpiece, and also reduces the human interference factors, so that the measurement result is more objective and accurate. However, the detection instrument is expensive, and the operation process is relatively complicated, which requires the operator to have high professional knowledge and skill level. At present, it is mainly applied to some large enterprises or high-end manufacturing fields with high demand for measurement precision and strong financial strength, and it is difficult to be widely popularized and applied in small and medium-sized workpiece processing measurement. Mechanical measurement, which usually uses standard calipers, micrometer and other measuring tools, has the advantages of low cost and simple operation, and is suitable for various scale processing enterprises and workshops, especially for workpiece measurement scenes with relatively sensitive cost but not extremely high precision requirement. However, although the mechanical measurement technology has low cost, it also has many disadvantages in practical application. Since mechanical measurement is mostly carried out in the free state of the workpiece, for some complex-shaped workpieces, especially flexible material workpieces such as rubber parts, it is impossible to ensure that the workpiece to be measured is measured in the same flatness, which leads to that the measurement result cannot accurately reflect the actual size and shape of the workpiece, and cannot meet the requirement of high-precision measurement. SUMMARY

[0005] In view of the problem that mechanical measurement cannot meet the profile size measurement of flexible materials in the prior art, the application provides an auxiliary device for measuring the profile size of a workpiece and a measuring method.

[0006] To achieve the above purpose, the application adopts the following technical solutions: The application provides an auxiliary device for measuring the profile size of a workpiece, which comprises a base, positioning blocks are arranged on both sides of the base, a pair of surface pins and a plurality of hook head pressure plates are arranged on the positioning blocks, and a flat plate is clamped between the hook head pressure plates and the positioning blocks.

[0007] Optionally, the distance between the upper surface of the surface pin and the surface of the flat plate is the middle line height of the surface tolerance range of the part to be measured.

[0008] Optionally, the positioning block comprises a base connecting part, one end of the base connecting part is connected with the base, and the other end of the base connecting part is connected with a positioning extension part, the positioning extension part is matched with the hook head pressing plate to clamp the flat plate.

[0009] Optionally, the positioning extension part is an L-shaped positioning extension part.

[0010] Optionally, the base connecting part is connected with the base through a screw.

[0011] Optionally, the hook head pressing plate is connected with the positioning block through a nut.

[0012] Optionally, a gasket is arranged between the nut and the positioning block.

[0013] Optionally, a positioning pin is arranged on the positioning block, and a positioning pin hole matched with the positioning pin is arranged on the base.

[0014] The application further provides a workpiece profile size measuring method using the auxiliary device for measuring the profile size of a workpiece. The flat plate is clamped between the hook head pressing plate and the positioning block, and is leveled. The workpiece to be measured is placed on the leveled flat plate. The touch pin type dial gauge is zeroed on the table pin, the measuring end of the zeroed touch pin type dial gauge is touched on the surface of the part to be measured, and the reading of the touch pin type dial gauge is recorded. The profile size of the part is calculated according to the reading of the touch pin type dial gauge.

[0015] Optionally, the method for calculating the profile size of the part according to the data of the touch pin type dial gauge is as follows:

[0016] wherein, is the profile size of the part, is the distance between the upper surface of the table pin and the surface of the flat plate, is the reading of the touch pin type dial gauge.

[0017] Compared with the prior art, the application has the following beneficial effects: The application provides an auxiliary device for measuring the profile size of a workpiece, comprising a base, positioning blocks arranged on both sides of the base, a pair of surface pins arranged on the positioning blocks, and a plurality of hook-shaped pressing plates, wherein the hook-shaped pressing plates are clamped between the positioning blocks and the flat plate. The base provides support for the entire auxiliary device, the positioning blocks on both sides of the base ensure the position of the workpiece to be measured in the horizontal direction, the hook-shaped pressing plates clamp and fix the flat plate, the flatness of the flat plate is adjusted to meet the measurement standard, and the measurement of the workpiece is provided with a basis. The surface pins arranged on the positioning blocks provide a reliable reference point for zero calibration of the contact probe type dial gauge. During zero calibration, the contact probe type dial gauge is calibrated on the surface pins, which can eliminate the error of the measuring instrument itself and ensure the accuracy of the measurement data. During use, the flat plate is leveled under the action of the positioning blocks and the hook-shaped pressing plates, then the contact probe type dial gauge is calibrated on the surface pins, and the measurement end of the contact probe type dial gauge is brought into contact with the surface of the part to realize the profile measurement of the surface of the flexible workpiece. The auxiliary device has a simple structure and is easy to operate. Compared with some complex measuring equipment, the device does not require tedious debugging and preparation work, greatly shortening the preparation time before measurement. At the same time, the auxiliary device can cleverly change the measurement of the flexible part into mechanical contact measurement through the arrangement of the base, the positioning blocks, the hook-shaped pressing plates and the surface pins, avoiding the problem of inaccurate measurement results caused by part deformation, and the entire process does not involve part clamping and extrusion deformation of the part, realizing accurate measurement of the profile of the flexible part, providing reliable data support for product assembly and debugging, and reducing the rework and maintenance costs caused by size mismatch. In addition, the manufacturing cost of the auxiliary device is relatively low, and it is easy to purchase and maintain. Compared with some high-precision optical measuring instruments or three-coordinate measuring machines, the equipment investment cost of the measurement method is greatly reduced, and it is suitable for use in small and medium-sized enterprises and general production workshops.

[0018] The distance between the upper surface of the surface pin and the surface of the flat plate is the center line height of the tolerance range of the part to be measured, which can make the measuring instrument measure the workpiece surface at a position that is more consistent with the actual size distribution center of the workpiece after zero calibration of the surface pin, can minimize the measurement error caused by reference deviation, and make the measurement result closer to the true profile size of the workpiece. In addition, the surface of the flexible workpiece may have a certain degree of fluctuation or unevenness. Taking the center line height of the tolerance range as the measurement reference is equivalent to considering the positive and negative deviations of the workpiece surface size during measurement. When the contact probe type dial gauge measures the workpiece surface after zero calibration on the surface pin, the measurement of the convex or concave part of the surface can more accurately reflect the deviation degree relative to the center position of the tolerance, rather than simply reflecting the difference from a certain fixed ideal size, thereby improving the accuracy of the measurement.

[0019] The positioning block comprises a base connecting part, one end of which is connected with the base, and the other end of which is connected with a positioning extension part, which cooperates with the hook head pressing plate to clamp the flat plate. The one end of the base connecting part is closely connected with the base, which provides a solid foundation for the whole positioning block. The positioning extension part cooperates with the hook head pressing plate to realize effective clamping and plane fixation of the flat plate, which guarantees the reference degree of actual measurement.

[0020] The positioning extension part is an L-shaped positioning extension part, and the two vertical surfaces of the L-shaped positioning extension part can respectively constrain the flat plate and the flexible workpiece from different directions. In the horizontal direction, one vertical surface can prevent the flat plate from sliding in this direction; in the vertical direction, the other vertical surface can prevent the flat plate from lifting up or sinking down. Such multi-directional constraint can ensure that the flat plate maintains a stable horizontal position during measurement, thereby providing a reliable clamping foundation for accurate measurement.

[0021] The base connecting part is connected with the base through a screw, which has a simple structure, low modification cost, firm connection and convenient disassembly.

[0022] The hook head pressing plate is connected with the positioning block through a nut, and a gasket is arranged between the nut and the positioning block. The gasket has good elastic and plastic deformation ability, and when the nut is tightened, the gasket will be elastically deformed, evenly distributing the pressure generated by the hook head pressing plate on the contact surface of the positioning block. For the flat plate, uniform pressure distribution can ensure that the flat plate maintains a stable horizontal position during measurement.

[0023] A positioning pin is arranged on the positioning block, and a positioning pin hole matched with the positioning pin is arranged on the base, which facilitates the positioning and installation of the positioning block and improves the installation efficiency.

[0024] The application also provides a workpiece profile size measurement method using the auxiliary device for measuring workpiece profile size, which comprises the following steps: clamping the flat plate between the hook head pressing plate and the positioning block, leveling, and placing the workpiece to be measured on the leveled flat plate; then, zeroing the dial gauge on the dial pin, touching the measuring end of the zeroed dial gauge to the surface of the workpiece to be measured, and recording the dial gauge reading; finally, calculating the profile size of the workpiece according to the dial gauge reading. Wherein, clamping the flat plate between the hook head pressing plate and the positioning block and leveling it can build a stable and horizontal basic reference plane for the whole measurement process, which can ensure that the dial gauge moves in the direction perpendicular to the reference plane during the measurement process, avoiding measurement errors caused by the inclination of the reference plane; zeroing the dial gauge on the dial pin can eliminate the system error of the dial gauge itself and the error possibly introduced during the installation and adjustment of the measurement device, providing an accurate zero reference point for the dial pin, and through the zeroing operation, the actual deviation between the workpiece surface and the reference plane can be zeroed, improving the measurement accuracy. The method is relatively simple to operate, and does not require complex tools and professional skills. The operator only needs to place the flat plate on the positioning block, and then fix it through the hook head pressing plate and the nut. This simple clamping method can greatly shorten the preparation time before measurement, improve the work efficiency, and improve the production efficiency. At the same time, the flow of the measurement method is clear and explicit, even for people without rich measurement experience, they can also quickly master the operation essentials of the method and perform accurate measurement, which has a wide application prospect in actual production and can meet the needs of operators at different levels. BRIEF DESCRIPTION OF DRAWINGS

[0025] Fig. 1 It is a top view of an auxiliary device for measuring workpiece profile size.

[0026] Fig. 2 It is a sectional view of an auxiliary device for measuring workpiece profile size.

[0027] Fig. 3 It is a base structure diagram of an auxiliary device for measuring workpiece profile size.

[0028] Fig. 4 It is a positioning block structure diagram of an auxiliary device for measuring workpiece profile size.

[0029] Fig. 5 It is a hook head pressing plate structure diagram of an auxiliary device for measuring workpiece profile size.

[0030] Fig. 6 It is a flow chart of a workpiece profile size measurement method.

[0031] Wherein, 1 - base, 2 - positioning block, 3 - screw, 4 - positioning pin, 5 - nut, 6 - washer, 7 - hook head pressing plate, 8 - pair of table pins, 9 - flat plate 21 - base connecting part, 22 - positioning extension part. DETAILED DESCRIPTION

[0032] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some but not all of the embodiments of the present application. The components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0033] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative labor are within the scope of protection of the present application.

[0034] It should be noted that: similar reference numerals and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0035] In the description of the embodiments of the present application, it should be noted that if the terms "upper", "lower", "horizontal", "inner" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship when the product of the present application is used, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second" and the like are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0036] In addition, if the term "horizontal" appears, it does not mean that the component must be absolutely horizontal, but can be slightly inclined. For example, "horizontal" only means that its direction is relatively more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0037] In the description of the embodiments of the present application, it also needs to be explained that, unless explicitly specified and limited, if the terms "arrange", "install", "connect", "connect" appear, they should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0038] The present application will be further described in detail below in conjunction with specific embodiments, which are an explanation of the present application rather than a limitation.

[0039] Referring to Figs. 1-2 The present application discloses a kind of auxiliary device for measuring workpiece profile size, including base 1, positioning block 2, flat plate 9, pair of table pins 8, and several hook head pressure plate 7; Referring to Fig. 3 The base 1 is main component, for providing main support for the entire auxiliary device;Referring to Fig. 4 The positioning block 2 is located on the two sides of base 1, the positioning block 2 includes base connecting portion 21, one end of the base connecting portion 21 is connected with base 1, the other end of the base connecting portion 21 is connected with positioning extension 22, the positioning extension 2 cooperates hook head pressure plate 7 clamping flat plate 9;The positioning extension 22 is L type positioning extension;The base connecting portion 21 is connected with base 1 by screw 3;Positioning pin 4 is provided on the base connecting portion 21, positioning pin hole is provided on the base 1 and cooperates with the positioning pin 4, to facilitate the installation of positioning block 2 and base 1.

[0040] Referring to Fig. 5 The hook head pressure plate 7 is evenly distributed on the positioning block 2 and is fixedly connected by nut 5, and gasket 6 is provided between the nut 5 and the positioning block 2 for maintaining the stability of the hook head pressure plate 7 and the positioning block 2; The flat plate 9 is a measuring instrument for workpiece inspection or scribing, and the flatness is a main index for determining the accuracy level, using the principle of determining a plane by three points, the flatness of the flat plate 9 is adjusted by the cooperation of the hook head pressure plate 7 and the positioning block 2, to ensure the accuracy of measuring the profile of the measured part;The measured workpiece is placed on the flat plate 9 that has been adjusted, considering the positioning stability and positioning accuracy, the smaller the contact surface is, the better.

[0041] The pair of table pins 8 is provided on the positioning block 2, and the distance between the upper surface of the pair of table pins 8 and the surface of the flat plate 9 is the middle line height of the surface tolerance range of the measured part.

[0042] In use, the principle of three points determining a plane is used, and uniform and multi-point clamping can greatly reduce clamping deformation. The rotating nut 5 is used to adjust the clamping force of the hook head pressing plate 7 on the holding plate 9, change the position of the clamping force, adjust the flatness of the holding plate 9, set the height of the counter gauge pin 8 to the middle line height of the surface tolerance range of the part to be measured, and install the dial gauge on the end of the measuring rod. The zero is calibrated on the counter gauge pin 8. The dial gauge needle slides on the surface to be measured at a certain speed, and the micro-unevenness of the surface to be measured will cause the needle to move up and down. The swing amplitude of the dial gauge needle plus the size of the counter gauge pin can calculate the profile size of the part.

[0043] Referring to Fig. 6 The present application provides a workpiece profile size measuring method using the above-mentioned auxiliary device for measuring the profile size of a workpiece, comprising: S1: clamp the plate 9 between the hook head pressing plate 7 and the positioning block 2, and adjust the level; S2: place the workpiece to be measured on the leveled plate 9; S3: calibrate the dial gauge on the counter gauge pin 8, and touch the measuring end of the calibrated dial gauge to the surface of the part to be measured, and record the reading of the dial gauge; S4: calculate the profile size of the part according to the reading of the dial gauge, and the method for calculating the profile size of the part is: .

[0044] Wherein, the profile size of the part, the distance between the upper surface of the counter gauge pin 8 and the surface of the plate 9, the reading of the dial gauge.

[0045] The flat plate 9 is clamped between the hook head pressing plate 7 and the positioning block 2 and leveled, thereby constructing a stable and horizontal base reference plane for the whole measuring process, which can ensure that the probe type dial gauge moves along the direction perpendicular to the reference plane during the measuring process, thereby avoiding the measuring error caused by the inclination of the reference plane; the zero setting of the dial gauge on the counter shaft can eliminate the system error of the dial gauge itself and the error possibly introduced during the installation and debugging of the measuring device, and provides an accurate zero reference point for the counter shaft 8; by touching the measuring end of the dial gauge to the counter shaft and performing zero setting, it can be ensured that the dial gauge accurately reflects the actual deviation between the workpiece surface and the reference plane during the measurement of the workpiece, and the zero setting operation can zero the deviation, thereby improving the measuring accuracy. The method is relatively simple to operate, and does not require complex tools and professional skills; the operator only needs to place the flat plate 9 on the positioning block 2, and then fix it through the hook head pressing plate 7 and the nut, which can greatly shorten the preparation time before measuring, improve the work efficiency, and improve the production efficiency. At the same time, the measuring method has a clear and explicit process, and even personnel without rich measuring experience can quickly master the operation essentials of the method and perform accurate measurement, thereby having a wide application prospect in actual production and being able to meet the needs of operators at different levels.

[0046] The above only describes the preferred embodiments of the present application, and is not intended to limit the technical solutions of the present application in any way. Those skilled in the art should understand that the technical solutions can be modified and replaced in several simple ways without departing from the spirit and principles of the present application, and these modifications and replacements also fall within the protection scope of the claims.

Claims

1. An auxiliary device for measuring the contour dimensions of a workpiece, characterized in that, The device includes a base, on both sides of which are provided positioning blocks. Each positioning block is provided with a dial indicator pin and several hook pressure plates. A flat plate is clamped between the hook pressure plates and the positioning blocks.

2. The auxiliary device for measuring the contour dimensions of a workpiece according to claim 1, characterized in that, The distance between the upper surface of the dial pin and the surface of the flat plate is the centerline height of the surface tolerance range of the part to be measured.

3. The auxiliary device for measuring the contour dimensions of a workpiece according to claim 1, characterized in that, The positioning block includes a base connecting part, one end of which is connected to the base, and the other end of which is connected to a positioning extension part. The positioning extension part cooperates with the hook pressure plate to clamp the flat plate.

4. The auxiliary device for measuring the contour dimensions of a workpiece according to claim 3, characterized in that, The positioning extension is an L-shaped positioning extension.

5. The auxiliary device for measuring the contour dimensions of a workpiece according to claim 3, characterized in that, The base connection part is connected to the base by screws.

6. The auxiliary device for measuring the contour dimensions of a workpiece according to claim 1, characterized in that, The hook plate is connected to the positioning block by a nut.

7. The auxiliary device for measuring the contour dimensions of a workpiece according to claim 6, characterized in that, A washer is provided between the nut and the positioning block.

8. The auxiliary device for measuring the contour dimensions of a workpiece according to claim 1, characterized in that, The positioning block is provided with a positioning pin; the base is provided with a positioning pin hole that cooperates with the positioning pin.

9. A method for measuring the contour dimensions of a workpiece using the auxiliary device for measuring the contour dimensions of a workpiece according to any one of claims 1-8, characterized in that, include: Clamp the flat plate between the hook plate and the positioning block, and level it. Place the workpiece to be tested on the leveled flat plate; Zero the dial indicator using the pin setting pin, then place the measuring end of the zeroed dial indicator on the surface of the part to be measured, and record the reading of the dial indicator. Calculate the part's outline dimensions based on the reading of the stylus dial indicator.

10. The workpiece contour dimension measurement method according to claim 9, characterized in that, The method for calculating the part contour dimensions based on data from a stylus dial indicator is as follows: in, For the part's outline dimensions, This refers to the distance between the upper surface of the pin and the surface of the flat plate. This is the reading of a stylus dial indicator.

Images