An engine cylinder head bottom plate thickness detection device and detection method

Abstract

The present invention discloses an engine cylinder head bottom plate thickness detection device and a detection method. It includes the following steps: measuring the thickness C of the cylinder head and the thickness E of the bushing head of the bushing; calibrating the total distance B between the probe and the probe rod; inserting the probe into the area of the cylinder head to be measured, making the lower end face of the bushing head of the bushing fit with the upper end face of the cylinder head, and the probe contact with the upper end face of the cylinder head bottom plate; measuring the distance D that the probe rod extends relative to the bushing; calculating the thickness A of the cylinder head bottom plate through the formula: A = C - (B - D - E). The present invention can quickly obtain the accurate thickness of the cylinder head bottom plate, avoiding the influence of casting defects such as the roughness of the inner cavity blank of the cylinder head and sand holes and air holes in the material on ultrasonic measurement, solving the problem of low measurement accuracy of the ultrasonic measurement method, and also avoiding the loss of cutting the cylinder head.

Description

Technical Field

[0001] The invention belongs to the technical field of engine detection and measurement, and in particular relates to a device and a method for detecting the thickness of an engine cylinder head bottom plate. Background Art

[0002] When testing the thickness of workpieces with closed cavities, such as engine cylinder heads, it is usually necessary to use a destructive testing method of cutting first and then measuring, which is costly, has a long cycle, and the frequency of testing cannot be increased. The industry uses industrial CT, ultrasonic and other methods to measure closed cavities, but the equipment investment is too large and the measurement accuracy and measurement effect are limited.

[0003] The above existing method for detecting the thickness of the engine cylinder head bottom plate has the following defects:

[0004] 1. The destructive testing method of cutting and measuring the cylinder head is costly and time-consuming.

[0005] 2. Because the thickness of the cylinder head is usually greater than 100mm, CT is difficult to penetrate, so CT machines are rarely used.

[0006] 3. Ultrasonic measurement uses a probe to perform two-dimensional scanning on the workpiece to obtain the position of each scanning point and the ultrasonic echo information. The inner cavity of the cylinder head is generated by casting, and the surface roughness is too large, resulting in poor coupling between the probe and the contact surface and low reflected echo; when the detection surface is not parallel to the bottom surface, the sound wave encounters the bottom surface and is scattered, and the probe cannot receive the bottom wave signal; castings and austenitic steel have uneven structure or pores and sand holes, and the ultrasonic wave produces severe scattering attenuation when passing through them. The scattered ultrasonic wave propagates along a complex path, which may cause the echo to be annihilated, resulting in no display.

[0007] In summary, dissection and re-measurement, CT, and ultrasound measurements all have limitations, and the measurement effects are limited. Summary of the invention

[0008] The purpose of the present invention is to solve the deficiencies of the above-mentioned background technology and to provide a device and method for detecting the thickness of an engine cylinder head bottom plate.

[0009] The technical solution adopted by the present invention is: an engine cylinder head bottom plate thickness detection device, comprising a measuring rod, a shaft sleeve is sleeved on the measuring rod, the shaft sleeve and the measuring rod are clearance-matched, and a measuring head is fixed on the end of the measuring rod.

[0010] In a further preferred structure, the sleeve comprises a sleeve head and a sleeve tail, and the middle of the sleeve head is connected to one end of the sleeve tail and is perpendicular to each other.

[0011] In a further preferred structure, the upper end surface and the lower end surface of the sleeve head are planar structures.

[0012] A further preferably structure, the tail part of the bushing is a cylindrical structure.

[0013] A further preferably structure, the probe is fixed on the fixing block, and the fixing block is fixed at the end of the measuring rod by bolts.

[0014] A further preferably structure, the probe protrudes from the end of the measuring rod.

[0015] A further preferably structure, the end of the probe is a conical structure.

[0016] A further preferably structure, the thickness E of the head part of the bushing is 8 mm.

[0017] A detection method for a detection device of the thickness of the bottom plate of an engine cylinder head includes the following steps:

[0018] Step 1: Measure the thickness C of the cylinder head and the thickness E of the head part of the bushing.

[0019] Step 2: Calibrate the total distance B between the probe and the measuring rod.

[0020] Step 3: Insert the probe into the area of the cylinder head to be measured, make the lower end face of the head part of the bushing fit with the upper end face of the cylinder head, and the probe contact with the upper end face of the bottom plate of the cylinder head.

[0021] Step 4: Measure the distance D that the measuring rod extends relative to the bushing.

[0022] Step 5: Calculate the thickness A of the bottom plate of the cylinder head through the formula: A = C - (B - D - E).

[0023] The present invention can quickly obtain the accurate thickness of the bottom plate of the cylinder head, avoid the influence of the roughness of the inner cavity blank of the cylinder head and the casting defects such as sand holes and air holes in the material on the ultrasonic measurement, solve the problem of low measurement accuracy of the ultrasonic measurement method, and also avoid the loss of cutting the cylinder head. Compared with the ultrasonic measurement and the three - coordinate measurement after cutting, the present invention has the advantages of convenience, quickness, low cost and accurate measurement. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic structural diagram of the device of the present invention;

[0025] Figure 2 It is a schematic diagram of the principle of the measurement method of the present invention.

[0026] In the figure, 1 - measuring rod, 2 - bushing (2 - 1 - head part of the bushing, 2 - 2 - tail part of the bushing), 3 - fixing block, 4 - probe, 5 - bolt, 6 - cylinder head, 7 - bottom plate of the cylinder head. DETAILED DESCRIPTION OF THE INVENTION

[0027] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments.

[0028] As Figure 1 shown, the present invention includes a measuring rod 1, on which a bushing 2 is sleeved. The bushing 2 is in clearance fit with the measuring rod 1, and a measuring head 4 is fixed to the end of the measuring rod 1.

[0029] The bushing 2 includes a bushing head 2-1 and a bushing tail 2-2. The middle of the bushing head 2-1 is connected to one end of the bushing tail 2-2 by intersection and is perpendicular to each other.

[0030] The upper and lower end faces of the bushing head 2-1 are plane structures.

[0031] The bushing tail 2-2 is a cylindrical structure.

[0032] The measuring head 4 is fixed on a fixing block 3, and the fixing block 3 is fixed to the end of the measuring rod 1 by a bolt 5.

[0033] The measuring head 4 protrudes from the end of the measuring rod 1.

[0034] The end of the measuring head 4 is a conical structure.

[0035] The thickness E of the bushing head 2-1 is 8 mm.

[0036] As Figure 2 shown, a detection method for the thickness of the bottom plate of an engine cylinder head includes the following steps:

[0037] Step 1: Measure the thickness C of the cylinder head and the thickness E of the bushing head 2-1 of the bushing 2 with a height gauge;

[0038] Step 2: Calibrate the total distance B between the measuring head 4 and the measuring rod 1 with a caliper;

[0039] Step 3: Insert the measuring head 4 into the area of the cylinder head 6 to be measured, make the lower end face of the bushing head 2-1 of the bushing 2 fit with the upper end face of the cylinder head 6, and make the measuring head 4 contact the upper end face of the bottom plate 7 of the cylinder head;

[0040] Step 4: Measure the distance D that the measuring rod 1 extends relative to the bushing 2 with a caliper;

[0041] Step 5: Calculate the thickness A of the bottom plate 7 of the cylinder head through the formula: A = C - (B - D - E).

[0042] The comparison between this embodiment and the prior art has the following effects:

[0043]

[0044] The content not detailedly described in this specification belongs to the prior art well-known to those skilled in the art.

Claims

1. Detection method of the thickness of the bottom plate of an engine cylinder head. The detection device for the thickness of the bottom plate of the engine cylinder head includes a measuring rod (1), on which a bush (2) is sleeved. The bush (2) is in clearance fit with the measuring rod (1), and a measuring head (4) is fixed at the end of the measuring rod (1). The bush (2) includes a bush head (2-1) and a bush tail (2-2). The middle of the bush head (2-1) is in intersecting connection with one end of the bush tail (2-2) and they are perpendicular to each other. It is characterized in that: The detection method includes the following steps: Step 1: Measure the thickness C of the cylinder head and the thickness E of the bush head (2-1) of the bush (2). Step 2: Calibrate the total distance B between the measuring head (4) and the measuring rod (1). Step 3: Insert the measuring head (4) into the area of the cylinder head (6) to be measured, make the lower end face of the bush head (2-1) of the bush (2) fit with the upper end face of the cylinder head (6), and the measuring head (4) contact with the upper end face of the bottom plate (7) of the cylinder head. Step 4: Measure the distance D that the measuring rod (1) extends relative to the bush (2). Step 5: Calculate the thickness A of the bottom plate (7) of the cylinder head through the formula: A = C - (B - D - E).

2. The detection method of a detection device for the thickness of the engine cylinder head bottom plate according to claim 1, characterized in that: The upper end face and the lower end face of the bush head (2-1) are plane structures.

3. The detection method of a detection device for the thickness of the engine cylinder head bottom plate according to claim 1, characterized in that: The bush tail (2-2) is a cylindrical structure.

4. The detection method of a detection device for the thickness of the engine cylinder head bottom plate according to claim 1, characterized in that: The measuring head (4) is fixed on a fixing block (3), and the fixing block (3) is fixed at the end of the measuring rod (1) through a bolt (5).

5. The detection method of a detection device for the thickness of the engine cylinder head bottom plate according to claim 1 or 4, characterized in that: The measuring head (4) protrudes from the end of the measuring rod (1).

6. The detection method of a detection device for the thickness of the engine cylinder head bottom plate according to claim 1 or 4, characterized in that: The end of the measuring head (4) is a conical structure.

7. The detection method of a detection device for the thickness of the engine cylinder head bottom plate according to claim 1, characterized in that: The thickness E of the bush head (2-1) is 8 mm.

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