如何測量 O 形環(huán)槽、盲孔角和底切

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

如何測量 O 形環(huán)槽、盲孔角和底切

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

測量孔和管 ID 中的大多數(shù)特征 = Novacam 沒問題

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.

測量孔和管的內(nèi)徑 (ID) 是 Novacam 3D 計(jì)量系統(tǒng)每天要做的事情。該系統(tǒng)使用非接觸式側(cè)視探頭獲取小至 1 毫米的 ID。探頭以高達(dá)每秒 100,000 次 3D 點(diǎn)測量的速率逐點(diǎn)掃描線性、圓形或螺旋方式的 ID 表面。通過這種方式，系統(tǒng)（BoreInspect或TubeInspect）測量內(nèi)徑尺寸（GD&T 參數(shù)）、粗糙度、顫振或缺陷。

However there are harder cases

但是還有更困難的情況

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.

今天的博客針對(duì) Novacam標(biāo)準(zhǔn)側(cè)視探頭的光束無法完全到達(dá)目標(biāo)表面的情況提出了解決方案。如下圖所示，這些情況包括 (a) 盲孔角、(b) 底切和 (c) O 形環(huán)槽。

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

額外具有挑戰(zhàn)性的測量區(qū)域：(a) 盲孔角，(b) 底切，以及 (c) O 形環(huán)槽及其內(nèi)半徑

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)的情況下，探頭的“死區(qū)”限制了光束被引導(dǎo)到底部角區(qū)域。死區(qū)是光束中心到探頭尖端之間的距離，如下圖所示。

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

Novacam 標(biāo)準(zhǔn)側(cè)視光學(xué)探頭以共線方式掃描

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)的情況下，如果底切壁與掃描光束平行，則光束顯然不會(huì)到達(dá)表面，因此不會(huì)對(duì)其進(jìn)行測量。如果底切壁非常陡峭，光束可能會(huì)射到表面，但對(duì)于某些要求苛刻的測量應(yīng)用（例如，粗糙度或毛刺測量），可能沒有足夠的光反射回來。

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 形環(huán)槽 (c)也稱為壓蓋，具有垂直或陡峭的壁，其粗糙度會(huì)影響 O 形環(huán)的使用壽命和密封性能。此外，需要測量內(nèi)角的曲率半徑以確保 O 形環(huán)密封功能正常。同樣，這些對(duì)于標(biāo)準(zhǔn)側(cè)視探頭來說是具有挑戰(zhàn)性的測量。

Custom option: side-looking probes with oblique beam angles

自定義選項(xiàng)：具有傾斜光束角的側(cè)視探頭

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:

針對(duì)上述應(yīng)用需求，Novacam 設(shè)計(jì)并制造了具有傾斜光束角的定制探頭。傾斜光束探頭具有向前或向后傾斜的光束，開辟了新的測量可能性：

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 形環(huán)槽的底壁

Inside radius of curvature of O-ring grooves

O 形環(huán)槽的內(nèi)曲率半徑

Backward slanted beam

向后斜光束

Measure:

措施：

Top walls of undercuts

底切的頂壁

Top walls of O-ring grooves

O 形環(huán)槽的頂壁

Inside radius of curvature of O-ring grooves

O 形環(huán)槽的內(nèi)曲率半徑

Backward slanted beam cont.

向后傾斜光束續(xù)。

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.

在難以觸及的地方進(jìn)行金屬加工（例如鉆孔）時(shí)產(chǎn)生的銳邊、毛刺和其他缺陷。示例包括航空航天工業(yè)中鉚釘鉆孔上的毛刺。

文件：AN-THICKNESS-1.2（2021-06-03）

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