如何测量 O 形环槽、盲孔角和底切

2023-07-03 18:02

How to measure O-ring grooves, blind-hole corners, and undercuts

如何测量 O 形环槽、盲孔角和底切

Measuring most features in bore and tube IDs = no problem for Novacam

测量孔和管 ID 中的大多数特征 = Novacam 没问题

Measuring inside diameters (IDs) of bores and tubes is something that Novacam 3D metrology systems do every day.
The systems use non-contact side-looking probes to acquire IDs as small as 1 mm. The probes scan ID surfaces in linear, circular, or spiral fashion, in a point-by-point manner, at a rate of up to 100,000 3D point measurements per second. In this way, the systems (
BoreInspect
or
TubeInspect) measure inside-diameter dimensions (GD&T parameters), roughness, chatter, or defects.

测量孔和管的内径 (ID) 是 Novacam 3D 计量系统每天要做的事情。该系统使用非接触式侧视探头获取小至 1 毫米的 ID。探头以高达每秒 100,000 次 3D 点测量的速率逐点扫描线性、圆形或螺旋方式的 ID 表面。通过这种方式,系统(BoreInspectTubeInspect)测量内径尺寸(GD&T 参数)、粗糙度、颤振或缺陷。

However there are harder cases

但是还有更困难的情况

Today’s blog presents a solution for cases where the beam from Novacam
standard
side-looking probes can’t quite reach the surface of interest. As shown in the diagram below, these cases include (a) blind hole corners, (b) undercuts and (c) O-ring grooves.

今天的博客针对 Novacam标准侧视探头的光束无法完全到达目标表面的情况提出了解决方案。如下图所示,这些情况包括 (a) 盲孔角、(b) 底切和 (c) O 形环槽。

Extra challenging areas to measure: (a) blind holes corners, (b) undercuts, and (c) O-ring grooves and their inside radii

额外具有挑战性的测量区域:(a) 盲孔角,(b) 底切,以及 (c) O 形环槽及其内半径

In the case of
blind hole corners (a), the “dead space” of the probe limits the light beam from being directed at the bottom corner area. Dead space is the distance between the center of the light beam to the probe tip, as shown in the diagram below.

在盲孔角 (a)的情况下,探头的“死区”限制了光束被引导到底部角区域。死区是光束中心到探头尖端之间的距离,如下图所示。

Novacam standard side-looking optical probe scans in a collinear manner

Novacam 标准侧视光学探头以共线方式扫描

In the case of
undercuts (b), if the undercut walls are parallel to the scanning light beam, the beam will obviously not hit the surface, and so will not measure it. If the undercut wall is very steep, the light beam may hit the surface but not enough light may be reflected back for certain demanding measurement applications (e.g., roughness or burr measurements).

在底切 (b)的情况下,如果底切壁与扫描光束平行,则光束显然不会到达表面,因此不会对其进行测量。如果底切壁非常陡峭,光束可能会射到表面,但对于某些要求苛刻的测量应用(例如,粗糙度或毛刺测量),可能没有足够的光反射回来。

ring grooves (c), also called glands, have vertical or steep walls whose roughness has an impact on the life and sealing performance of the O-ring. Additionally, the radius of curvature of the inside corner needs to be measured to ensure proper O-ring seal functionality. Again, these are challenging measurements for a standard side-looking probe.

O 形环槽 (c)也称为压盖,具有垂直或陡峭的壁,其粗糙度会影响 O 形环的使用寿命和密封性能。此外,需要测量内角的曲率半径以确保 O 形环密封功能正常。同样,这些对于标准侧视探头来说是具有挑战性的测量。

Custom option: side-looking probes with oblique beam angles

自定义选项:具有倾斜光束角的侧视探头

Responding to the needs of the above applications, Novacam designs and builds custom probes with oblique beam angles. Oblique beam probes feature forward or backward slanted beams that open up new measurement possibilities:

针对上述应用需求,Novacam 设计并制造了具有倾斜光束角的定制探头。倾斜光束探头具有向前或向后倾斜的光束,开辟了新的测量可能性:

Forward slanted beam

前斜光束

Measure:

措施:

Bottom corners of blind holes

盲孔底角

Bottom walls of O-ring grooves

O 形环槽的底壁

Inside radius of curvature of O-ring grooves

O 形环槽的内曲率半径

Backward slanted beam

向后斜光束

Measure:

措施:

Top walls of undercuts

底切的顶壁

Top walls of O-ring grooves

O 形环槽的顶壁

Inside radius of curvature of O-ring grooves

O 形环槽的内曲率半径

Backward slanted beam cont.

向后倾斜光束续。

Measure:

措施:

Sharp edges, burrs and other defects created from metalworking (e.g., drilling) in hard-to-reach places.
Examples include burs on drilled-through rivet holes in the aerospace industry.

在难以触及的地方进行金属加工(例如钻孔)时产生的锐边、毛刺和其他缺陷。示例包括航空航天工业中铆钉钻孔上的毛刺。


文件:AN-THICKNESS-1.22021-06-03

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