CN215065590U - Sample preparation tool for measuring thickness of paint coating of automobile plastic paint spraying part - Google Patents
Sample preparation tool for measuring thickness of paint coating of automobile plastic paint spraying part Download PDFInfo
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- CN215065590U CN215065590U CN202120708413.0U CN202120708413U CN215065590U CN 215065590 U CN215065590 U CN 215065590U CN 202120708413 U CN202120708413 U CN 202120708413U CN 215065590 U CN215065590 U CN 215065590U
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Abstract
The utility model relates to a sample preparation tool for measuring the thickness of a paint coating of an automobile plastic paint spraying part, which comprises a sample grinding bolt, a base and a locking piece; the head of the sample grinding bolt is a cylinder with a smooth side face, the surface finish is ^ 9- & lt 11 & gt, and the rod part is provided with an external thread; the base is of a hollow columnar structure, the hollow part consists of a coaxial cylindrical hole a and a cylindrical hole b, the aperture of the cylindrical hole a is larger than that of the cylindrical hole b, the plane of the orifice of the cylindrical hole a on the base is a plane and is vertical to the central shaft of the cylindrical hole a, and the wall of the cylindrical hole b is provided with an internal thread matched with the external thread; the aperture of the cylindrical hole a is equal to or slightly larger than the diameter of the head of the grinding bolt, and the difference is not more than 0.05 mm; the depth of the cylindrical hole a is smaller than the height of the head of the grinding bolt; the locking piece is used for locking the base on the grinding bolt. The utility model discloses a system appearance frock practices thrift the time and the consumptive material cost of system appearance, can test the coating thickness that plane or curved surface shape sprayed paint the piece in a flexible way, high-efficient and accurately.
Description
Technical Field
The utility model relates to a measurement of plastic part paint coating thickness mainly relates to automobile-used plastics paint surface protection part.
Background
At present, the measurement of the thickness of a paint coating of a plastic spray painting part for a vehicle in the industry is divided into destructive measurement and non-destructive measurement.
The nondestructive measurement refers to directly measuring the thickness of a coating by using relevant equipment without damaging the original part, such as magnetic/electromagnetic thickness measurement, eddy current thickness measurement, ultrasonic thickness measurement, X-ray thickness measurement and the like, is mainly used for the condition that the part is not allowed to be damaged, has higher requirements on test equipment, and can generate health hazard by ray and radiation. Destructive measurement refers to that the original shape of a part to be measured is destroyed by cutting, grinding and the like, a sample is made for detection, such as a cold-setting method and a rotary grinding thickness measurement method, and the requirement of test equipment is low. The detection of the vehicle parts allows the parts to be damaged, and the method is more used.
Destructive measurement in particular, the cold-setting method is to use bi-component phenolic resin and chemical reagent, to prepare a coating section sample through chemical solidification, and then to measure the coating thickness through a high-precision microscope after sample grinding treatment. The method is time-consuming in the chemical material solidification process, has certain environmental health hazard due to pungent smell generated by chemical reagents, is high in experimental consumable cost, is easy to generate coating cross section inclination on a curved surface sample, is large in sample grinding area, and is difficult to adjust the paint spraying cross section through sample grinding.
The rotary grinding thickness measuring method is that a paint film thickness measuring instrument is utilized, a drill bit is used for drilling a coating layer on the coating layer surface to a plastic base material, the inclined section of the coating layer is obtained, and then a microscope is utilized for estimating and reading the scale between the base material and a comparison mark, so that the paint thickness is obtained. The sample prepared by the method is not independent, only can be used by a simple microscope of a thickness gauge, the fuzzy aperture easily causes reading deviation and visual fatigue, and the authenticity of an experimental result is further reduced for the test of special application (a certain layer of a multi-layer coating or a curved surface sample).
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a car plastics part paint coating thickness measuring system appearance frock of spraying paint, the time and the consumptive material cost of practicing thrift the system appearance reduce the healthy harm of environment for nimble, high-efficient and accurately test plane or curved surface shape spray paint the coating thickness of piece.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a sample preparation tool for measuring the thickness of a paint coating of an automobile plastic spray-painted part comprises a sample grinding bolt, a base and a locking piece;
the head of the sample grinding bolt is a cylinder with a smooth side face, the surface finish is ^ 9- & lt 11 & gt, and the rod part is provided with an external thread;
the base is of a hollow columnar structure, the hollow part consists of a coaxial cylindrical hole a and a cylindrical hole b, the aperture of the cylindrical hole a is larger than that of the cylindrical hole b, the surface (used for pressing a sample wafer to form downward pressure) of the orifice of the cylindrical hole a on the base is a plane and is vertical to the central axis of the cylindrical hole a, and the hole wall of the cylindrical hole b is provided with an internal thread matched with the external thread;
the aperture of the cylindrical hole a is equal to or slightly larger than the diameter of the head of the grinding bolt, and the difference is not more than 0.05 mm; the depth of the cylindrical hole a is smaller than the height of the head of the grinding bolt;
in the sample preparation tool of the utility model, two contact positions of the sample grinding bolt and the base are provided, one is the contact between the hole wall of the cylindrical hole b and the rod part thread of the sample grinding bolt, and the other is the contact between the hole wall of the cylindrical hole a and the side surface of the head part of the sample grinding bolt, so that the stability is further kept without shaking, in order to ensure the stability, the side surface of the head part of the sample grinding bolt is required to be controlled to be smooth and not to be provided with edges and corners, and the diameter difference between the hole diameter of the cylindrical hole a and the diameter difference between the hole diameter of the head part of the sample grinding bolt is smaller;
the locking piece is used for locking the base on the bolt that grinds the appearance, and it is movable after all to grind appearance bolt and base threaded connection, and the atress can rotate at any time when grinding the appearance, so needs the locking piece to die the base lock.
As a preferred technical scheme:
according to the sample preparation tool for measuring the thickness of the paint coating of the automobile plastic painted part, the locking piece is a fixing nut;
the fixing nut is of a hollow columnar structure, the hollow part is a cylindrical hole c, and an internal thread matched with the external thread is arranged on the hole wall of the cylindrical hole c;
the sum of the heights of the base and the fixing nut is less than or equal to the length of the rod part of the grinding bolt.
According to the sample preparation tool for measuring the thickness of the paint coating of the automobile plastic painted part, the depth of the cylindrical hole a is 9.8-10.2mm, and the height of the head of the sample grinding bolt is 14.8-15.2 mm.
According to the sample preparation tool for measuring the thickness of the paint coating of the automobile plastic painted part, the aperture of the cylindrical hole a is 40-40.025mm, and the aperture of the cylindrical hole b is 20-20.025 mm.
According to the sample preparation tool for measuring the thickness of the paint coating of the automobile plastic painted part, the height of the base is 29.5-30.5mm, the height of the fixing nut is 9.5-10.5mm, and the length of the rod part of the sample grinding bolt is 40.5-41.5 mm.
According to the sample preparation tool for measuring the paint coating thickness of the automobile plastic painted part, the base is of a hollow cylindrical structure (or a hollow prismatic structure and the like), and the central axis of the base coincides with the central axis of the cylindrical hole a.
According to the sample preparation tool for measuring the thickness of the paint coating of the automobile plastic painted part, the fixing nut is of a hollow cylindrical structure (or a hollow prismatic structure and the like), and the central axis of the fixing nut coincides with the central axis of the cylindrical hole c.
Has the advantages that:
(1) optimizing a sample preparation process: the sample preparation tool can rapidly prepare samples for plane or curved surface parts, has flexible operation, short time consumption, low dependence on equipment, low material consumption cost and no harm to environmental health;
(2) optimizing the sample preparation effect: compared with a cold inlaying method, the utility model is more convenient to obtain a coating section sample with high flatness and no inclination; compared with a rotary milling thickness measurement method, the prepared sample is independent and can be independently used for a high-precision microscope, the measurement accuracy is ensured, and the advantages of the two samples are combined;
(3) ensuring the measurement effect: for a single-layer or multi-layer coating structure, the coating boundary presented by a high-precision microscope is clear, the testing precision reaches the micron level, and the requirements of the standard test (such as TL226 and TL211) for the surface protection of the plastic paint for vehicles are met.
Drawings
FIG. 1 is a schematic view of a milling bolt;
FIG. 2 is a schematic view of a susceptor;
FIG. 3 is a schematic view of a retaining nut;
FIGS. 4 to 5 are schematic diagrams of a sample preparation tool for completing assembly;
FIG. 6 is a schematic view of a curved sample;
FIG. 7 is a schematic view of a flat master;
FIG. 8 is a front view of a fixed coupon on the sample preparation tool;
FIG. 9 is a bottom view of a planar sample on the sample preparation tool;
FIG. 10 is a bottom view of a curved surface sample on the sample preparation tool;
FIGS. 11 to 12 are schematic diagrams of sample wafer stress during sample preparation;
FIG. 13 is a microimaging of a tooling wear;
the method comprises the following steps of 1-grinding a rod part of a sample bolt, 2-grinding a head part of the sample bolt, 3-cylindrical hole a, 4-cylindrical hole b, 5-cylindrical hole c, 6-paint surface, 7-plastic matrix, 8-anti-extension strong adhesive tape and 9-grinding paper.
Detailed Description
The present invention will be further described with reference to the following detailed description. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Furthermore, it should be understood that various changes and modifications of the present invention may be made by those skilled in the art after reading the teachings of the present invention, and these equivalents also fall within the scope of the appended claims.
A sample preparation tool for measuring the thickness of a paint coating of an automobile plastic painted part comprises a sample grinding bolt, a base and a locking piece, wherein the sample grinding bolt is arranged on the base;
the head 2 of the sample grinding bolt is a cylinder with a smooth side face and a height of 15mm, the surface finish is ^ 9- & lt 11 & gt, and the rod part 1 is provided with an external thread;
the base is a hollow cylindrical structure with the height of 30mm, and the hollow part consists of a cylindrical hole a 3 and a cylindrical hole b 4 which are coaxial with the base;
the aperture of the cylindrical hole a 3 is 40mm, the aperture of the cylindrical hole a 3 is equal to the diameter of the head 2 of the sample grinding bolt, and the depth of the cylindrical hole a 3 is 10 mm; the surface of the cylindrical hole a 3 on the base where the opening is positioned (the surface is used for pressing the sample wafer to form downward pressure in use) is a plane and is vertical to the central axis of the cylindrical hole a 3;
the diameter of the cylindrical hole b 4 is 20mm, and an internal thread matched with the external thread is arranged on the wall of the cylindrical hole b 4;
the locking piece is a fixing nut with a hollow columnar structure and a height of 10mm, the hollow part is a cylindrical hole c 5, and the cylindrical hole c 5 is overlapped with the central shaft of the fixing nut; the wall of the cylindrical hole c 5 is provided with an internal thread matched with the external thread;
the locking piece is used for locking the base on the grinding bolt; the length of the shank 1 of the draw bolt is 41 mm.
Use the utility model discloses the step of system appearance frock preparation coating thickness measurement sample is as follows:
(1) assembling a sample preparation tool;
as shown in fig. 4-5, when assembling the tool, firstly, the rod part 1 of the sample grinding bolt is upwards vertically erected on a horizontal table surface, then the base is screwed from top to bottom, the base and the sample grinding bolt are combined by utilizing thread fit, the aperture of the cylindrical hole a 3 is equal to the diameter of the head part 2 of the sample grinding bolt, the head part 2 of the sample grinding bolt can be stretched and contracted by rotating the thread, the minimum exposed length and the maximum exposed length are respectively 5mm and 15mm, after selecting the proper exposed length, a fixing nut is installed above the base from top to bottom, and the tool is locked by the thread acting force;
(2) sampling and fixing the sample;
when the sample is a curved part, the specific process is as follows:
(a) sampling:
for curved surface parts with the thickness less than or equal to 5mm, cutting and preparing a square sample wafer with the length of 10mm and the width of 10mm on the parts, keeping the original thickness of the parts, and concentrating the curvature in the width direction as much as possible and straightening the length direction when selecting a sampling position as shown in figure 6;
keeping the cutting surface of the sample flat, and enabling four corners to be close to right angles;
(b) fixing a sample:
the position of the sample fixing piece is below the bottom surface of the base and is longer than the annular area of the head part 2 of the sample grinding bolt;
as shown in FIG. 10, for a curved coupon (10X 10 mm)2) The length straight direction is used as the vertical direction, the width bending direction is used as the horizontal direction, the grinding bolt is attached to the side face of the head 2 of the grinding bolt, and the paint surface 6 faces outwards and faces away from the head of the grinding bolt;
the side surface of the head 2 of the sample grinding bolt is attached to the sample wafer to form lateral supporting force; meanwhile, the lower bottom surface of the base presses the sample wafer to form downward pressure; as shown in fig. 8, the sample is bound tightly by an anti-stretching strong adhesive tape 8 to prevent the sample from being loosened by stress, the adhesive tape is made of a cloth stripe adhesive tape (made of a tensile PVC film and a rubber type pressure sensitive adhesive), and has strong bonding force, tensile strength and anti-stretching property;
when the sample is a plane part, the specific process is as follows:
(i) sampling:
as shown in fig. 7, for a planar part with a thickness of less than or equal to 5mm, the width of the sample wafer is reduced, and a rectangular sample wafer with a length of 10mm and a width of 5mm is prepared by cutting;
(ii) fixing a sample:
as shown in FIG. 9, for a flat coupon (10X 5 mm)2) The length direction of 10mm is taken as the vertical direction, the width direction of 5mm is taken as the horizontal direction, the sample grinding bolt is attached to the side surface of the head part 2 of the sample grinding bolt, and the other methods are consistent with the curved surface sample;
in addition, as the minimum exposed length and the maximum exposed length of the head 2 of the sample grinding bolt are respectively 5mm and 15mm, the tool allows the installation of sample wafers with the length within the size range and allows the deviation of sample preparation size; for parts with the thickness of more than 5mm, cutting and grinding the parts in the thickness direction, and keeping the thickness within 5 mm;
(3) grinding a sample by using a sample preparation tool;
the tool is heavy in steel material and balanced in structural gravity center;
as shown in fig. 11-12, the lateral supporting force of the head 2 of the sample grinding bolt, the downward pressure of the base and the binding force of the anti-extension strong adhesive tape can keep the stress stability of the sample and the vertical state of the sample from tilting;
grinding a sample by using grinding paper 9 rotated by a sample grinder, keeping the bottom surface of a grinding bolt attached to the grinding paper 9 without inclination until the sample is in a smooth state, and grinding by using small-particle 1000# felt with soft texture considering that the hardness of a plastic matrix 7 is small for selecting the grinding paper 9;
(4) as shown in fig. 13, after the sample was ground, the sample was taken off from the tool to obtain an independent sample, and the coating thickness was measured directly using a model VXH-600 microscope to obtain a micrometer-level clear coating thickness.
Claims (7)
1. A sample preparation tool for measuring the thickness of a paint coating of an automobile plastic spray-painted part is characterized by comprising a sample grinding bolt, a base and a locking piece;
the head of the sample grinding bolt is a cylinder with a smooth side face, the surface finish is ^ 9- & lt 11 & gt, and the rod part is provided with an external thread;
the base is of a hollow columnar structure, the hollow part consists of a coaxial cylindrical hole a and a cylindrical hole b, the aperture of the cylindrical hole a is larger than that of the cylindrical hole b, the plane of the orifice of the cylindrical hole a on the base is a plane and is vertical to the central shaft of the cylindrical hole a, and the wall of the cylindrical hole b is provided with an internal thread matched with the external thread;
the aperture of the cylindrical hole a is equal to or slightly larger than the diameter of the head of the grinding bolt, and the difference is not more than 0.05 mm; the depth of the cylindrical hole a is smaller than the height of the head of the grinding bolt;
the locking piece is used for locking the base on the grinding bolt.
2. The sample preparation tool for measuring the thickness of the paint coating of the automobile plastic painted part according to claim 1, wherein the locking piece is a fixing nut;
the fixing nut is of a hollow columnar structure, the hollow part is a cylindrical hole c, and an internal thread matched with the external thread is arranged on the hole wall of the cylindrical hole c;
the sum of the heights of the base and the fixing nut is less than or equal to the length of the rod part of the grinding bolt.
3. The sample preparation tool for measuring the paint coating thickness of the automobile plastic painted part according to claim 2, wherein the depth of the cylindrical hole a is 9.8-10.2mm, and the height of the head of the sample grinding bolt is 14.8-15.2 mm.
4. The sample preparation tool for measuring the paint coating thickness of the automobile plastic painted part as claimed in claim 2, wherein the diameter of the cylindrical hole a is 40-40.025mm, and the diameter of the cylindrical hole b is 20-20.025 mm.
5. The sample preparation tool for measuring the paint coating thickness of the automobile plastic painted part according to claim 2, wherein the height of the base is 29.5-30.5mm, the height of the fixing nut is 9.5-10.5mm, and the length of the rod part of the sample grinding bolt is 40.5-41.5 mm.
6. The sample preparation tool for measuring the thickness of the paint coating of the automobile plastic painted part as claimed in claim 2, wherein the base is a hollow cylindrical structure, and the central axis of the base coincides with the central axis of the cylindrical hole a.
7. The sample preparation tool for measuring the thickness of the paint coating of the automobile plastic painted part as claimed in claim 2, wherein the fixing nut is of a hollow cylindrical structure, and the central axis of the fixing nut coincides with the central axis of the cylindrical hole c.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120708413.0U CN215065590U (en) | 2021-04-08 | 2021-04-08 | Sample preparation tool for measuring thickness of paint coating of automobile plastic paint spraying part |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120708413.0U CN215065590U (en) | 2021-04-08 | 2021-04-08 | Sample preparation tool for measuring thickness of paint coating of automobile plastic paint spraying part |
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| Publication Number | Publication Date |
|---|---|
| CN215065590U true CN215065590U (en) | 2021-12-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120708413.0U Active CN215065590U (en) | 2021-04-08 | 2021-04-08 | Sample preparation tool for measuring thickness of paint coating of automobile plastic paint spraying part |
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| CN (1) | CN215065590U (en) |
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- 2021-04-08 CN CN202120708413.0U patent/CN215065590U/en active Active
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