Print detection method for geometric dimension of mounting surface of ceramic forming part

Abstract

The invention discloses a method for detecting the geometric dimension of a mounting surface of a ceramic forming part by adopting an impression, which comprises the following steps of: S1, pretreating a mounting groove of a ceramic tile block: polishing the surface of the mounting groove of a ceramic heat insulation tile by abrasive paper until no salient point exists on the surface; s2, the pressing force of the elastic component is adjusted, specifically, the distance W of the elastic component is adjusted to the required size, and it is guaranteed that the clamping force is consistent under the installation condition; s3, surface treatment of the elastic component: spraying a composite coloring coating on a mounting surface matched with the ceramic tile groove; s4, mounting groove imprint generation: mounting the ceramic heat insulation tile on a simulation detection tool, and in the process, sticking a coating on the contact surface of the ceramic tile groove to form a coloring imprint; and S5, mark standard judgment: judging whether the requirements are met or not according to the marks, and if a certain item is not met, judging that the size of the ceramic tile is unqualified. According to the method, the detection precision is improved, the reduction degree of the microcosmic contact state is improved to 92% (40% higher than that of CMM), the detection cost of a single piece is reduced by 97%, and the maximum detectable surface roughness reaches Ra 20 microns.

Description

TECHNICAL FIELD

[0001] The present application relates to a kind of ceramic forming parts mounting surface geometry mark detection method, belong to ceramic forming parts assembly quality detection field. BACKGROUND

[0002] The isolation ceramic tile of heavy gas turbine combustion chamber is loaded and fixed using elastic support component, to effectively absorb the thermal vibration energy caused by high-temperature gas scouring, significantly reduce the fatigue damage caused by mechanical vibration to ceramic matrix. However, there are many pain points in the installation slot geometry detection of ceramic heat insulation tile:

[0003] 1. The detection means is not matched:

[0004] 1-1 Contact detection: traditional CMM (coordinate measuring machine) detection uses discrete point sampling (interval ≥0.5mm), which cannot reproduce the actual contact state of ceramic surface micro-peak and valley (wavelength ≤0.1mm), resulting in large measurement error.

[0005] 1-2 Non-contact detection: blue light scanning measurement increases the measurement error due to the light transmittance of ceramic tile.

[0006] 2. Ceramic material characteristics problem: the surface porosity of ceramic material (such as corundum) after sintering is ≥5%, and the hardness is very high. Contact measurement probe (such as three-coordinate probe, dial gauge, micrometer, etc.) is easy to wear, which affects the detection accuracy and equipment life. SUMMARY

[0007] In view of the problems existing in the prior art, the present application provides a mark detection method for the geometry of the mounting surface of a ceramic forming part, thereby solving the above technical problems.

[0008] In order to achieve the above purpose, the technical scheme adopted by the present application is: a mark detection method for the geometry of the mounting surface of a ceramic forming part, comprising the following steps

[0009] Step S1: ceramic tile installation slot pretreatment: the surface of ceramic heat insulation tile installation slot is polished with sandpaper, and the surface is free of convex points;

[0010] Step S2: elastic component compression force adjustment: the distance W between the elastic component is adjusted to the required size, to ensure the clamping force under the installation condition is consistent;

[0011] Step S3: elastic component surface treatment: spray composite color coating on the installation surface matched with ceramic tile slot;

[0012] Step S4: installation slot mark generation: then install the ceramic heat insulation tile on the simulation detection tool. In this process, the contact surface of the ceramic tile slot will stick to the coating to form a colored mark;

[0013] Step S5: print mark standard judgment: according to the print mark, judge whether it meets the requirements, if a certain item does not meet the requirements, judge that the ceramic tile block size is unqualified.

[0014] Further, in the step S3, the composite coloring paint is Prussian blue / red ocher powder two-component paint, the mixing ratio is 3:1, the particle size distribution D50=5-10um, the color threshold pressure is 0.15-0.3MPa.

[0015] Further, it further comprises a dynamic loading simulation system; the dynamic loading simulation system comprises an elastic member with variable rigidity; the rigidity coefficient of the elastic member is 5-15N / mm, and a pressure sensor module and a temperature compensation module are arranged in the elastic member; the pressure sensor module is used for sensing the pressure of the elastic member, and the resolution is 0.1N; the temperature compensation module is used for temperature adjustment, and the compensation coefficient is 0.05% / ℃.

[0016] Further, in the step S5, a mathematical model of installation force-print mark area is established:

[0017] S=k1*F / E*(1+αΔT)

[0018] Wherein: S is the theoretical contact area, and k is the surface topography coefficient.

[0019] Further, in the step S1, the surface of the ceramic heat insulation tile installation groove is sanded with 200 mesh sandpaper, and the surface energy difference is ≤5%.

[0020] The beneficial effects of the present application are: the detection precision of the method is improved, the micro contact state restoration degree is improved to 92% (40% higher than CMM), the single piece detection cost is reduced by 97%, and the maximum surface roughness that can be detected reaches Ra20um. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical scheme and advantages of the present application more clear and obvious, the present application is further described in detail below through examples. However, it should be understood that the specific examples described herein are only used to explain the present application, and are not used to limit the scope of the present application.

[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs, and the terms used herein in the specification are only for the purpose of describing specific embodiments and are not intended to limit the present application.

[0023] In the present embodiment, the geometric size of the ceramic forming part installation surface is detected by the print mark detection method, which comprises the following steps:

[0024] Step S1: ceramic tile block installation groove pretreatment: the surface of the ceramic heat insulation tile installation groove is sanded with sandpaper, and the surface is free of convex points;

[0025] Step S2: elastic member compression force adjustment: the distance W of the elastic member is adjusted to the required size to ensure consistent clamping force under installation conditions;

[0026] Step S3: surface treatment of elastic member: the installation surface of the ceramic tile groove is sprayed with composite colorant;

[0027] Step S4: installation groove mark generation: then the ceramic heat insulation tile is installed on the simulation detection tool, and in this process, the ceramic tile groove contact surface will stick to the paint to form a colored mark;

[0028] Step S5: mark standard judgment: whether the mark meets the requirements is judged, and if a certain item does not meet the requirements, it is judged that the size of the ceramic tile block is unqualified.

[0029] In the preferred embodiment of the present embodiment, the composite colorant in step S3 is Prussian blue / red ocher powder two-component paint, the mixing ratio is 3:1, the particle size distribution D50 is 5-10 μm, and the color development threshold pressure is 0.15-0.3 MPa.

[0030] The preferred embodiment further comprises a dynamic loading simulation system; the dynamic loading simulation system comprises an elastic member with variable stiffness; the stiffness coefficient of the elastic member is 5-15 N / mm, and the inside is provided with a pressure sensor module and a temperature compensation module; the pressure sensor module is used to sense the pressure of the elastic member, and the resolution is 0.1 N; the temperature compensation module is used for temperature adjustment, and the compensation coefficient is 0.05% / °C.

[0031] In the preferred embodiment of the present embodiment, in step S5, a mathematical model of installation force-mark area is established:

[0032] S=k\cdot\frac{F}{E}\cdot(1+\alpha\Delta T) where: S is the theoretical contact area, k is the surface topography coefficient.

[0033] In the preferred embodiment of the present embodiment, in step S1, the surface of the ceramic heat insulation tile installation groove is isentropically sanded with 200-mesh sandpaper, and the surface energy difference is ≤5%.

[0034] Working principle: the surface of the installation groove is isentropically sanded with 200-mesh sandpaper (surface energy difference ≤5%)

[0035] Spray composite colorant (film thickness 8±2 μm)

[0036] Loading detection phase: apply 1.2 times working load (pressure distribution CV≤8%) in the simulation tooling, and keep pressure for 10-15 min (creep compensation time)

[0037] Data analysis phase: collect the imprint by using a machine vision system (resolution 20 μm / pixel): ■HSV color space segmentation (H∈[210, 240]), morphological open operation to eliminate noise, and automatically generate a detection report.

[0038] ■Output island distribution thermodynamic diagram.

[0039] ■Calculate the effective contact area ratio.

[0040] The beneficial effects of the present application are: the detection precision of the method is improved, the micro contact state restoration degree is improved to 92% (40% higher than CMM), the single piece detection cost is reduced by 97%, and the maximum surface roughness that can be detected reaches Ra20 μm.

[0041] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement or improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A method for measuring the geometry of a ceramic molded part mounting surface using an indentation detection method, characterized by, The method comprises the following steps Step S1: ceramic tile block installation groove pretreatment: the surface of the ceramic heat insulation tile installation groove is polished with sandpaper, and the surface is free of convex points; Step S2: elastic member compression force adjustment: the distance W of the elastic member is adjusted to the required size, so that the clamping force under the installation condition is consistent; Step S3: surface treatment of the elastic member: the composite color coating is sprayed on the installation surface matched with the ceramic tile groove; Step S4: installation groove mark generation: then, the ceramic heat insulation tile is installed on the simulation detection tool, and in this process, the coating is adhered to the contact surface of the ceramic tile groove to form a colored mark; Step S5: mark standard judgment: whether the mark meets the requirements is judged according to the mark, and if a certain item does not meet the requirements, it is judged that the size of the ceramic tile block is unqualified.

2. The method according to claim 1, wherein the geometry of the ceramic shaped part mounting surface is detected by using a marking method. In the step S3, the composite color coating is Prussian blue / red ocher powder two-component coating, the mixing ratio is 3:1, the particle size distribution D50=5-10μm, and the color development threshold pressure is 0.15-0.3MPa.

3. The method of claim 1, wherein the geometry of the ceramic shaped part mounting surface is detected by using a print detection method. The method further comprises a dynamic loading simulation system; the dynamic loading simulation system comprises an elastic member with variable rigidity; the rigidity coefficient of the elastic member is 5-15N / mm, and the elastic member is internally provided with a pressure sensor module and a temperature compensation module; the pressure sensor module is used for sensing the pressure of the elastic member, and the resolution is 0.1N; the temperature compensation module is used for temperature adjustment, and the compensation coefficient is 0.05% / ℃.

4. The method of claim 1, wherein the geometry of the ceramic shaped part mounting surface is detected by using a footprint. In the step S5, a mathematical model of the installation force-mark area is established: S = k \cdot \frac{F}{E} \cdot (1 + \alpha \Delta T) Wherein: S is the theoretical contact area, and k is the surface topography coefficient.

5. The method of claim 1, wherein the geometry of the ceramic shaped part mounting surface is detected by using a footprint. In the step S1, the surface of the ceramic heat insulation tile installation groove is polished with 200-mesh sandpaper, and the surface energy difference is ≤5%.