阅读说明：本技术 一种螺纹沉孔位置度量具及螺纹沉孔检测方法 (Measuring tool for position degree of threaded counter bore and threaded counter bore detection method ) 是由 熊吉健 徐晓虎 于 2020-06-11 设计创作，主要内容包括：本发明公开了一种螺纹沉孔位置度量具,属于检测工具技术领域。一种螺纹沉孔位置度量具,包括：轴向连接的螺纹杆和光杆；光杆套设有测量头,并且测量头与光杆滑动配合,测量头的外轮廓位于同一圆柱面上并且圆柱面的轴线与螺纹杆的轴线重合。本发明采用螺纹杆来辅助确定螺纹孔的中径,进而确定螺纹孔的轴线,即螺纹杆的轴线,测量头在光杆上滑动时,测量头的外轮廓能够顺利进入沉孔中,即表示螺纹沉孔合格,通过延伸螺纹孔的中径对螺纹沉孔进行检测,螺纹沉孔的检测精度高,并且整体检测过程快捷、简单。(The invention discloses a measuring tool for the position degree of a threaded counter bore, and belongs to the technical field of detection tools. A thread counter bore position measurement gauge comprising: the threaded rod and the polished rod are axially connected; the polished rod cover is equipped with the measuring head to measuring head and polished rod sliding fit, the outline of measuring head is located same face of cylinder and the axis of face of cylinder and the axis coincidence of threaded rod. The threaded rod is adopted to assist in determining the pitch diameter of the threaded hole, so that the axis of the threaded hole, namely the axis of the threaded rod, is determined, when the measuring head slides on the polished rod, the outer contour of the measuring head can smoothly enter the counter bore, namely the threaded counter bore is qualified, the threaded counter bore is detected by extending the pitch diameter of the threaded hole, the detection precision of the threaded counter bore is high, and the whole detection process is quick and simple.)

1. A thread counter bore position measuring tool is characterized by comprising: a threaded rod (10) and a polished rod (20) which are axially connected; the polish rod (20) is sleeved with a measuring head (30), the measuring head (30) is in sliding fit with the polish rod (20), the outer contour of the measuring head (30) is located on the same cylindrical surface, and the axis of the cylindrical surface coincides with the axis of the threaded rod (10).

2. The threaded counterbore position gauge of claim 1 characterized in that the cross section of the polish rod (20) is circular and the polish rod (20) is a rod of constant diameter.

3. The threaded counterbore position degree gauge of claim 2, characterized in that the axis of the polish rod (20) coincides with the axis of the threaded rod (10) and the axis of the measuring head (30), the axis of the measuring head (30) coinciding with the axis of the cylindrical surface.

4. The thread counter bore position degree gauge according to any one of claims 1 to 3, characterized in that the measuring head (30) is in the form of a hollow cylinder, the cylindrical surface being located on the outer side of the measuring head (30).

5. The thread counter bore position measuring gauge according to any one of claims 1 to 3, wherein the measuring head (30) is in the form of a hollow triangular prism, and a prism edge of the measuring head (30) is located on the cylindrical surface.

6. A thread counterbore detection method based on the thread counterbore position degree measuring tool according to any one of claims 1 to 5, characterized by comprising the steps of:

s1: screwing the threaded rod (10) into the threaded hole of the threaded counter bore;

s2: sleeving the measuring head (30) on the polish rod (20), and enabling the measuring head (30) to slide on the polish rod (20), wherein if the measuring head (30) smoothly enters the counter bore of the threaded counter bore, the threaded counter bore is qualified in detection, and otherwise, the threaded counter bore is unqualified in detection.

7. The thread counter bore detection method according to claim 6, wherein in step S1, the threaded rod (10) is fully screwed into the threaded hole of the thread counter bore.

Technical Field

The invention relates to the technical field of detection tools, in particular to a measuring tool for the position degree of a threaded counter bore and a threaded counter bore detection method.

Background

The accessory hole structures of aero-engine combustion chamber casings and compressor casings are generally threaded counter bore structures. The conventional thread counter bore is used for extending the head of the hexagon socket head cap screw, and the size of the counter bore at the upper part of the thread counter bore is larger than that of the head of the hexagon socket head cap screw, so that the counter bore does not have the assembling effect under the conventional condition, the requirement on the counter bore is low, and the counter bore does not need to be detected.

However, the accessory holes of the combustion chamber casing and the compressor casing of the aircraft engine are used for connecting important sizes, and the size requirement is high. The lower part of the screw thread counter bore of here is the screw hole, and the upper portion is the counter bore, and the lateral wall of counter bore can be smooth or be the cockscomb structure, when processing the screw thread counter bore, processes the screw hole earlier, uses footpath in the screw hole to process out the counter bore as the basis again, because footpath is difficult to use traditional detection method direct measurement in the screw hole, leads to the position degree of counter bore to be difficult to the accurate measurement, direct influence subsequent assembly precision.

Disclosure of Invention

The invention aims to provide a measuring tool for the position degree of a threaded counter bore and a method for detecting the threaded counter bore, and aims to solve the problem that the position degree of the counter bore is difficult to accurately measure due to the fact that the pitch diameter of a threaded hole is difficult to measure by using a traditional detection method when the threaded counter bore is detected in the prior art.

The technical scheme for solving the technical problems is as follows:

a thread counter bore position measurement gauge comprising: the threaded rod and the polished rod are axially connected; the polished rod cover is equipped with the measuring head to measuring head and polished rod sliding fit, the outline of measuring head is located same face of cylinder and the axis of face of cylinder and the axis coincidence of threaded rod.

The threaded rod is connected with the threaded hole of the threaded counter bore, the pitch diameter of the threaded hole is determined in an auxiliary mode through the threaded rod, the axis of the threaded hole, namely the axis of the threaded rod, is determined, the cylindrical surface where the outer contour of the measuring head is located is matched with the counter bore of the threaded counter bore, when the measuring head slides on the polished rod, the axis of the cylindrical surface is overlapped with the axis of the threaded rod, the outer contour of the measuring head can smoothly enter the counter bore, and the fact that the threaded counter bore is qualified is indicated.

Furthermore, the section of the polish rod is circular, and the polish rod is a rod with a fixed diameter.

When the measuring head is sleeved on the polished rod with the circular section, the measuring head can rotate, and can detect the threaded counter bore at a plurality of angles, so that the influence of machining errors on the detection precision is reduced. The polished rod is a straight rod with a certain diameter, so that the measuring head can be conveniently sleeved on the polished rod and can slide on the polished rod.

Furthermore, the axis of the polish rod, the axis of the threaded rod and the axis of the measuring head coincide, and the axis of the measuring head coincides with the axis of the cylindrical surface.

The axis of the polished rod, the axis of the threaded rod, the axis of the measuring head and the axis of the cylindrical surface are all overlapped, so that the detection of the threaded counter bore from a plurality of angles is facilitated, the direction of the measuring head extending into the counter bore does not need to be found deliberately during measurement, and the measurement operation is simple and rapid.

Furthermore, the measuring head is a hollow cylinder, and the cylindrical surface is positioned on the outer side surface of the measuring head.

When the measuring head is in a hollow cylinder shape, the measuring head is matched with the counter bore with the smooth side wall, so that the threaded counter bore with the smooth side wall can be detected.

Furthermore, the measuring head is a hollow triangular prism, and the edge of the prism of the measuring head is positioned on the cylindrical surface.

When the measuring head is in a hollow triangular prism shape, the measuring head is matched with the counter bore of the serrated side wall, so that the threaded counter bore with the counter bore of the serrated side wall can be detected. When the measuring head is used for detection, the three prismatic edges of the measuring head are respectively positioned at the sawtooth root parts of the counter bores, namely the three prismatic edges of the measuring head are clamped in the sawteeth.

A thread counter bore detection method based on the thread counter bore position measuring tool comprises the following steps:

s1: screwing the threaded rod into the threaded hole of the threaded counter bore;

s2: and sleeving the measuring head on the polished rod, enabling the measuring head to slide on the polished rod, and if the measuring head smoothly enters the counter bore of the thread counter bore, detecting the thread counter bore to be qualified, otherwise, detecting the thread counter bore to be unqualified.

When the threaded counter bore is detected, the threaded rod is screwed into the threaded hole, the measuring head slides in the polished rod, the measuring head can extend into the counter bore, namely the threaded counter bore is qualified, and the detection process is quick and simple. The measuring head can be put into the counter bore from a plurality of angles by rotating the measuring head, so that the threaded counter bore is detected at a plurality of angles.

Further, in step S1, the threaded rod is fully screwed into the threaded hole of the threaded counterbore.

According to the invention, after the threaded rod is completely screwed into the threaded hole, when the measuring head slides on the polished rod, the outer contour of the measuring head can completely enter the counter bore, so that the counter bore can be completely detected.

The invention has the following beneficial effects:

(1) the threaded rod is adopted to assist in determining the pitch diameter of the threaded hole, so that the axis of the threaded hole, namely the axis of the threaded rod, is determined, when the measuring head slides on the polished rod, the outer contour of the measuring head can smoothly enter the counter bore, namely the threaded counter bore is qualified, the threaded counter bore is detected by extending the pitch diameter of the threaded hole, the detection precision of the threaded counter bore is high, and the whole detection process is quick and simple.

(2) The invention can not only detect the thread counter bore of the counter bore with the smooth side wall, but also detect the thread counter bore of the counter bore with the serrated side wall.

(3) The invention can detect the threaded counter bore at a plurality of angles.

Drawings

Fig. 1 is a schematic structural view of a screw thread counter bore position measuring tool according to embodiment 1 of the present invention;

FIG. 2 is a schematic view showing the structure of a measuring head according to embodiment 1 of the present invention;

FIG. 3 is a schematic view of a measuring head of example 1 of the present invention positioned in a counterbore of a threaded counterbore;

fig. 4 is a schematic structural diagram of the screw thread counter bore position measuring tool according to embodiment 1 of the present invention during detection;

FIG. 5 is a schematic structural diagram of a thread counter bore position measuring tool according to embodiment 2 of the present invention;

FIG. 6 is a schematic view showing the structure of a measuring head according to embodiment 2 of the present invention;

FIG. 7 is a schematic view of a measuring head of example 2 of the present invention positioned in a counterbore of a threaded counterbore;

fig. 8 is a schematic structural diagram of the screw thread counter bore position measuring tool according to embodiment 2 of the present invention during detection.

In the figure: 10-a threaded rod; 20-a polish rod; 30-measuring head.

Detailed Description

The principles and features of this invention are described below in conjunction with the following drawings, which are set forth by way of illustration only and are not intended to limit the scope of the invention.