JP3528160B2 - Scratch-type material surface film strength test apparatus and test method - Google Patents

Description

Detailed Description of the Invention

[0001]

[Industrial field of application] The surface coating treatment of metal materials is widely used industrially.
Examples include painting and chemical conversion coatings. In this case, whether or not the formed film satisfies the required adhesion strength is a problem, and it is required to measure this efficiently and judge the quality of the film. The present invention relates to a test apparatus for examining the film strength of a material surface and a test method therefor.

[0002]

2. Description of the Related Art Among the above-mentioned surface treatment methods, a method of depositing a chemical conversion coating, particularly a phosphate coating, by a chemical reaction is currently used in cold forging of carbon steel and low alloy steel.
Widely used as a lubricating means. If the adhesive strength is low, the film peels off immediately during processing and does not serve as a lubricant carrier on the surface of the material or as an anti-seizure agent for the tool and the material. However, there is no method for easily measuring the adhesion strength of this coating, and therefore, the general condition for determining the conditions for attaching the coating is to actually process a large number of forged products.

[0003]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a test apparatus for examining the film strength of a material surface and a test method therefor for solving the above problems.

[0004]

In order to achieve the above object, the invention according to claim 1 uses a sharp-pointed tool as a material.
The film formed on the surface of the material by scratching the surface
Scratch-type material surface film strength tester for checking adhesion
The tool attachment part and the freely rotatable grip part in parallel with each other.
Place it and connect it with the diagonal connecting part via the node part,
Make sure that the node on the side of the holding part and the tip of the tool are on substantially the same horizontal plane.
To form an overall N-shaped frame,
The joint part is more than the tool attachment part, diagonal connection part, and grip part.
Thin, and between the tool attachment part and the diagonal connection part
Extends vertically to press the tool and connects with the grip
To the tangential direction of the tool to the front of each
By installing a strain gauge on the joints,
Can simultaneously measure tangential force and vertical pressing force applied to tools
It is a noh play. The grip is fixed to the machine.
Or can be manually operable
It Furthermore, it can be operated by incorporating it as a part of various machinery and equipment.
You may do it. Further, the tip shape of the tool is
When viewed from the scratching direction, the side shape is arcuate and the front shape is
It has a ridgeline at the center, and it extends from the ridgeline in the left-right direction.
It is preferable that each has an inclined surface at a constant angle. This
-Type material surface coating using a tool with a shape like
The strength tester has a phosphate coating, especially on the surface coating.
Suitable for use in testing equipment for testing cold forged products
Is. Using this scratch type material surface film strength tester
When testing, use the measuring surface of the test piece as the moving surface of the tool.
A test to measure the film strength by fixing it with a slight inclination.
The test method is suitable.

[0005]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 shows the surface film strength test apparatus of the present invention .
A side view, FIG. 2 is the same front view, and FIG. 3 is the same plan view. Reference numeral 1 denotes an N-shaped frame, and a concave portion is provided near the nodes 2 and 3, and a resistance wire strain gauge 2A,
3A is attached, and the two-component force of the tangential force T and the vertical force N can be simultaneously measured with high sensitivity. A tool attachment portion 4 is provided at one end of the N-shaped frame 1 and a tool 5 is assembled. Further, a grip portion 6 is provided at the other end portion, and this portion is rotatable so that scratching proceeds in the tangential direction of the scratching tool 5. The tool mounting portion 4 and the grip portion 6 are
Is arranged in parallel with the diagonal connection part through the nodes 2 and 3.
They are connected by 11. The nodes 2 and 3 are tool removal
Sufficiently thinner than the attachment part 4, diagonal connection part 11, and grip part 6.
It is meat, and the node part 2 on the tool attachment part 4 side is the tool 5
It extends in the vertical direction to press the
It extends in the tangential direction of the tool 5. Nodes on the side of the grip
Arrange so that 3 and the tool tip are on substantially the same horizontal plane.
There is. Bunch lifting unit 6, for example, be a possible shape be assembled like consistency milling machine chuck.

FIG. 4 shows the details of the tool 5 . The tip portion of the tool 5 has an arcuate side surface shape with respect to the advancing tangential direction T ′ in which the tool 5 moves while scratching the material, while the front shape has a ridge line 5a at the substantially central portion thereof. An inclined surface 5b is provided toward the left side, and an inclined surface 5c is provided toward the right side thereof, and the blade edge is formed at a constant angle by the two inclined surfaces 5b and 5c.
The tip shape of such a tool 5 is an example of testing the adhesive strength of a phosphate coating as a lubricant for cold forging, but a wedge shape, a cone shape or a , Trapezoid, etc. can be appropriately selected.

FIG. 5 shows a surface film strength test apparatus of the present invention .
It shows an example of the test method used . Fixing the bunch lifting unit 6 to the chuck 7 of the hard-type milling machine, subjected to phosphate coating treatment in mild steel plate, the measurement specimen was coated metallic soap 8
Is fixed on the table 9 with a vise or the like. At this time, the vertical load is gradually increased, that is, the tool pressing force is gradually increased, so that the tool is fixed with a slight inclination.
Feed table 9 stiffness milling machine in the direction of the arrow F, scratching the film surface of the test piece 8, then the resulting normal force N, tangent
The linear force T is measured, and the reaction force R is calculated from the vertical force N.
It FIG. 10 shows the reaction force R and the tangential force T obtained from the vertical force N.
It is a figure which shows a relationship. In FIG 5, the feed table 9 of the hard-type milling machine in the direction of the arrow F, when scratch the film surface of the test piece 8, the normal force generated at that time, as shown in FIG. 5
N, tangential force T can be measured, and reaction force is more than normal force N
R can be obtained. Using these, the numerical value representing the magnitude of the slip resistance between the tool and the material corresponding to the friction coefficient, T
/ 2R is obtained. The table 9 is continuously fed in the direction of the arrow, and the tool pressing force is gradually increased to perform the measurement.
At this time, a phenomenon occurs in which the tangential force T rapidly rises. That position is where the film rupture occurred. The same measurement is performed for various tool shapes, and the evaluation results of the obtained coating are compared with the evaluation results of the coating in cold forging at the production site, and the tool tip shape is modified so that the same evaluation can be obtained. If there is a shape, it will be revised as the standard tool shape. Table 1 shows, as an example, the measurement results of the mild steel sheet subjected to the phosphate film treatment. Here, the vertical force and the tangential force can be clearly measured, and by determining the coefficient of friction, it is possible to judge the quality of the film from the examination of the results. In addition, prior to the test, it is desirable to perform a comparative verification of whether the tangential force T of the tool 5 and the strain gauges 2A, 3A for detecting the vertical pressing force N normally operate. As shown in FIGS. 6 and 7, the grip 6 is fixed with a vise 10 and the weight W is hung on the tip of the tool 5 to perform the verification.
FIG. 8 shows the relationship between the load of the vertical force N and the amount of strain, and FIG. 9 shows the relationship between the tangential force T and the amount of strain. In both cases, there is little interference with the output, and it can be seen that the measurement accuracy is extremely high.

[0008]

[Table 1]

[0009]

As described above, the present invention has a pointed construction.
Formed on the material surface by scratching the material surface with a tool
Scratch-type material surface film strength test to investigate the adhesion strength of the film
In the device, the tool attachment part and the freely rotatable
It is arranged in parallel with the car and at the diagonal connection via the node.
Connect it, and the node on the gripping part side and the tool tip are on the same horizontal plane.
The N-shaped frame as a whole
Forming, the joint part is tool attachment part, diagonal connection part, grip
Being thinner than the part, diagonally connected to the tool mounting part
Between the parts, it extends vertically to press the tool,
Extend in the tangential direction of the tool between the holding part and the diagonal connecting part.
By providing strain gauges at each node.
Tangential force applied to the tool during scratching and vertical pressing
Since the force can be measured at the same time, it can be easily operated in a wide range of production sites, and has a remarkable effect that the surface film strength can be measured with extremely high reliability.

[0010]

[Brief description of drawings]

FIG. 1 is a side view of a surface film strength test apparatus according to an embodiment of the present invention .

FIG. 2 is a front view of a surface film strength test apparatus as an example of the present invention .

FIG. 3 is a plan view of a surface film strength test apparatus as an example of the present invention .

FIG. 4 is a surface film strength test device according to an embodiment of the present invention .
Detailed view of tool 5

FIG. 5 is an example of a test method using a surface film strength tester according to an embodiment of the present invention .

FIG. 6 is a surface film strength test device according to an embodiment of the present invention .
The figure which showed the verification method of the vertical force N detection gauge

FIG. 7 is a surface film strength test device according to an embodiment of the present invention .
Of the tangential force T detection gauge test method

FIG. 8 is a surface film strength test device according to an embodiment of the present invention .
Diagram showing the relationship between the load of vertical force N and the amount of strain in the verification

FIG. 9 is a surface film strength test device according to an embodiment of the present invention .
The figure which shows the relationship between the load of tangential force T and the amount of strain in the verification of the position .

FIG. 10 is a diagram showing a relationship between a reaction force R obtained from a vertical force N and a tangential force T.

[Explanation of symbols]

1 --- N-shaped frame 2, 3 ... Knots 2A, 3A ... Resistance wire strain gauge 5 ... Tool 5a ... Ridge line 5b, 5c · · · inclined surface 6 ....... bunch sandwiching member 11 ...... oblique connection portion

─────────────────────────────────────────────────── ─── Continuation of front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) G01N 19/04 G01N 3/00-3/62 G01L 1/00-27/02 JISST file (JOIS)

Claims (5)

(57) [Claims] 1. A pull examine destination adhesion strength of the film formed on the material surface by scratching the material surface at the pointed tool
Tool attachment in scratch type material surface film strength tester
And the freely rotatable gripping part are arranged parallel to each other.
Connect with the diagonal connection through the node and work with the node on the gripping side.
Placed so that the tip of the tool is on a substantially horizontal surface, the whole
Forming an N-shaped frame as the
Thin enough than the attachment part, diagonal connection part, and grip part,
Press the tool between the tool attachment part and the diagonal connection part
Vertically extending between the grip and the diagonal connection.
Extend in the tangential direction of the tool so that
Scratch-type material surface film strength tester that can measure the tangential force and vertical pressing force applied to the tool at the same time by scratching by providing a displacement gauge . Wherein said gripping portion is capable of fixing or operated manually in the machine, or it is possible to operate incorporated as a part of various machines and equipment, be a 2 component force measuring load sensor The scratch-type material surface film strength testing device according to claim 1, wherein 3. The tip shape of the tool has an arcuate side shape when viewed from the scratching direction, and a front shape has a ridge line at the central portion, and at a constant angle from the ridge line in the left-right direction. The scratch type material surface film strength test device according to claim 1 or 2 , wherein each device has a shape having an inclined surface. Coating wherein said material surface, wherein which is a film of phosphate coatings treated cold forging products
Item 3. A scratch type material surface film strength tester according to item 3 . 5. The scratch type material surface film strength test apparatus according to claim 1 , wherein the measuring surface of the test piece is fixed with a slight inclination to the moving surface of the tool. Scratch-type material surface film strength test method characterized by measuring film strength by doing.