Inner hole chamfer coordinate measuring device
By using an internal hole chamfer coordinate measuring device, the chamfered surface of the measuring shaft contacts the workpiece to be measured, and a compression spring provides preload force, thus solving the problems of low accuracy and efficiency of existing measuring tools and achieving high-precision and high-efficiency hole chamfer measurement.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHANGHAI ZHENHUA BEARING WORKS
- Filing Date
- 2025-05-30
- Publication Date
- 2026-05-12
AI Technical Summary
In the existing technology, the measuring tools for the coordinate dimensions of the orifice chamfer are of low accuracy and low efficiency, which cannot meet production needs.
Design an internal hole chamfer coordinate measuring device, including a measuring hole sleeve, a dial indicator, and a detachable and fixedly mounted pressure cover. The chamfered surface of the measuring shaft contacts the chamfer of the internal hole of the workpiece to be measured. The axial coordinate is obtained through the dial indicator. Combined with the compression spring, a preload force and a reset force are provided to ensure measurement accuracy and stability.
This improved the accuracy and efficiency of borehole chamfer coordinate measurement, achieving fast and accurate measurement results.
Smart Images
Figure CN224230873U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the technical field of chamfer measuring devices, and in particular to a device for measuring the coordinate dimensions of the chamfer at the opening of a hole, specifically relating to a device for measuring the coordinate dimensions of the chamfer at the opening of a hole. Background Technology
[0002] Bearing parts require internal hole machining, necessitating the measurement of the chamfer dimensions at the hole openings to verify compliance with design drawings. Currently, chamfer coordinate dimensions are typically measured using chamfer calipers and profilometers. However, chamfer calipers offer low accuracy and efficiency, while profilometers provide higher accuracy but are less efficient. Therefore, existing methods for measuring chamfer coordinate dimensions are no longer adequate for production needs.
[0003] To address the aforementioned issues, there is an urgent need to design a new measuring tool to quickly and accurately measure the coordinate dimensions of the orifice chamfer. Utility Model Content
[0004] To solve the above-mentioned technical problems, this utility model proposes a measuring device that can quickly and accurately measure the coordinates of the chamfer of an inner hole.
[0005] This utility model is achieved through the following technical solution: an internal hole chamfer coordinate measuring device, comprising,
[0006] Measuring hole sleeve, which is the central hole sleeve body;
[0007] The dial indicator is detachably and securely mounted on the top of the measuring hole sleeve; the measuring rod of the dial indicator is located inside the hollow cavity of the measuring hole sleeve.
[0008] The measuring shaft is movably installed in the hollow cavity of the measuring hole sleeve and can move up and down along the axial direction of the measuring hole sleeve. Its top surface contacts the measuring rod of the dial indicator. The working end of the measuring shaft extends vertically downward beyond the bottom of the measuring hole sleeve, and the bottom edge of the working end forms a chamfered bevel. A vertical guide part coaxial with it is formed on the bottom surface of the working end of the measuring shaft. The outer diameter of the guide part matches the inner diameter of the workpiece to be measured, guiding the chamfered bevel to contact the chamfer of the inner diameter of the workpiece to be measured.
[0009] In use, the chamfered bevel contacts the chamfered surface of the inner hole of the workpiece to be measured, the measuring rod is subjected to force, and the axial coordinate of the chamfer of the inner hole of the workpiece to be measured is obtained through the pointer of the dial indicator.
[0010] According to this utility model, the top of the measuring hole sleeve is detachably and fixedly connected to a pressure cover for fixing the dial indicator, and the measuring rod of the dial indicator passes through the pressure cover and contacts the top surface of the measuring shaft.
[0011] According to this utility model, there is a gap between the pressure cap and the measuring shaft, and a compression spring is provided in the gap. One end of the compression spring contacts the bottom surface of the pressure cap, and the other end contacts the top surface of the measuring shaft. It uses its own elasticity to provide pre-tightening force and reset elastic force to the measuring shaft.
[0012] According to this utility model, the measuring shaft and the measuring hole sleeve are further fitted with a clearance.
[0013] According to this utility model, the guide portion is further defined as a stepped shaft.
[0014] According to this utility model, the measuring hole sleeve is cylindrical, and the diameter of the opening on its bottom end face is smaller than the outer diameter of the measuring shaft but larger than the outer diameter of the working end, thus limiting the measuring shaft within the hollow cavity of the measuring hole sleeve.
[0015] Compared with the prior art, the beneficial effects of this utility model are as follows: This utility model improves measurement accuracy by providing a guide part at the bottom of the working end of the measuring shaft, which enables the chamfered surface to make stable and precise contact with the chamfer of the inner hole of the workpiece to be measured.
[0016] This utility model has a simple structure, is easy to process and assemble, and is convenient for use on the production site.
[0017] This invention is simple to measure, easy to operate, and improves the accuracy and efficiency of measurement. Attached Figure Description
[0018] Figure 1 This is a schematic diagram of the internal hole chamfer coordinate measuring device of this utility model;
[0019] Figure 2 This is a schematic diagram of the measuring shaft of this utility model;
[0020] Figure 3 for Figure 1 A magnified view of part A.
[0021] Among them, 100-measuring hole sleeve, 200-dial indicator, 210-measuring rod, 300-measuring shaft, 310-working end, 311-chamfered bevel, 400-pressure cap, 500-compression spring, 600-guide part. Detailed Implementation
[0022] To facilitate understanding of the utility model's objectives and effects, the specific embodiments of the utility model are as follows, in conjunction with the accompanying drawings:
[0023] like Figures 1 to 3As shown, an internal hole chamfer coordinate measuring device is provided for measuring the chamfer of the inner hole of a roller. It includes a hollow measuring hole sleeve 100. A dial indicator 200 is detachably and fixedly installed on the top of the measuring hole sleeve 100. The measuring rod 210 of the dial indicator 200 is located in the hollow cavity of the measuring hole sleeve 100. A measuring shaft 300 that contacts the measuring rod 210 of the dial indicator is also installed in the hollow cavity of the measuring hole sleeve 100. The top surface of the measuring shaft 300 contacts the measuring rod 210 of the dial indicator. The working end 310 of the measuring shaft 300 extends vertically downward beyond the bottom of the measuring hole sleeve 100. A chamfered bevel 311 is formed at the intersection of the bottom surface of the working end 310 and the outer peripheral surface. In use, the chamfered bevel 311 contacts the chamfered surface of the inner hole of the workpiece to be measured, and the measuring rod 210 is subjected to force. The axial coordinate of the chamfer of the inner hole of the workpiece to be measured is obtained through the pointer of the dial indicator 200. The measuring shaft 300 is clearance-fitted with the measuring sleeve 100, and the measuring shaft 300 can move up and down in the axial direction relative to the measuring sleeve 100, so that the chamfered bevel 311 can fully contact the chamfer of the workpiece to be measured, thereby obtaining more accurate measurement values. Moreover, it can adapt to chamfers of different sizes of workpieces to be measured. It should be noted here that the chamfered bevel 311 is slightly smaller than the chamfer of the inner hole of the workpiece to be measured.
[0024] Furthermore, a pressure cap 400 for fixing a dial indicator 200 is detachably and fixedly connected to the top of the measuring hole sleeve 100 by bolts. The pressure cap 400 has a mounting hole at its center that penetrates its upper and lower end faces. The measuring rod 210 of the dial indicator is inserted into the mounting hole of the pressure cap 400 and fixed to the pressure cap 400. There is a gap between the bottom surface of the pressure cap 400 and the top surface of the measuring shaft 300. A compression spring 500 coaxial with the measuring rod 210 is set in this gap. One end of the compression spring 500 contacts the bottom surface of the pressure cap 400 and the other end contacts the top surface of the measuring shaft 300. Its own elasticity plays a role in pre-tightening and resetting the measuring shaft 300.
[0025] Specifically, the measuring sleeve 100 is cylindrical, and the diameter of the opening on its bottom end face is smaller than the outer diameter of the measuring shaft 300 and larger than the outer diameter of the working end 310, thereby limiting the measuring shaft 300 and confining it within the hollow cavity of the measuring sleeve 100 to prevent the measuring shaft 300 from detaching from the measuring sleeve 100. The working end 310 can extend to the outside of the measuring sleeve 100 to contact the workpiece to be measured and is used to measure the chamfer of the workpiece.
[0026] In this embodiment, the bottom surface of the working end 310 of the measuring shaft is formed with a vertical guide portion 600 coaxial with it. The outer diameter of the guide portion 600 matches the inner diameter of the workpiece to be measured. In this way, the guide portion 600 first enters the inner hole of the workpiece to be measured, guiding the measuring shaft 310 smoothly into the inner hole of the workpiece to be measured, and determining the position in the X direction. This ensures the accuracy and stability of the contact position between the chamfered surface 311 and the chamfer of the inner hole of the workpiece to be measured, making the contact surface area between the chamfered surface 311 and the chamfer of the inner hole of the workpiece to be measured equal everywhere, thus ensuring more stable measurement.
[0027] In this embodiment, the guide portion 600 is a stepped shaft, which reduces its contact area with the inner hole peripheral wall of the workpiece to be tested while also serving a guiding function.
[0028] The steps for using this utility model are as follows:
[0029] 1. Prepare the standard part to be tested, and use a profilometer to measure the axial coordinate value A of its inner hole chamfer;
[0030] 2. Calibration is performed. The guide section 600 enters the inner hole of the part to be measured. The chamfered bevel 311 slowly enters the inner hole of the part to be measured along with the measuring shaft 310 until the circumferential diameter of the chamfered bevel 311 is consistent with the end diameter of the chamfer of the standard part's inner hole, that is, the chamfered bevel 311 contacts the end of the chamfer of the standard part's inner hole. Figure 3 As shown, continue to move along the axial direction of the inner hole of the workpiece to be measured. After the measuring shaft 310 is subjected to the force of the contact point, it moves upward along the cavity of the measuring hole sleeve 100. The compression spring 500 is compressed, the measuring rod 210 of the dial indicator moves upward, and the pointer begins to change until the lower end face of the measuring hole sleeve 100 contacts the upper end face of the workpiece to be measured and stops moving. Record the dial indicator reading B.
[0031] 3. Measure the workpiece again using the method described above, and record the dial indicator reading C;
[0032] 4. Calculate the axial coordinate value D of the chamfer of the inner hole of the workpiece, that is: D=A-(CB).
[0033] The working principle of this utility model is as follows: The device mainly reads the axial coordinate value of the chamfer of the inner hole of the workpiece from the dial indicator 200 by having the chamfered inclined surface 311 of the measuring shaft contact the chamfer of the workpiece to be measured. Then, by comparing the measurements, multiple measurements are taken to improve the measurement accuracy.
[0034] The above description is merely a preferred embodiment of this utility model and is not intended to limit this utility model in any form or substance. It should be noted that those skilled in the art can make several improvements and additions without departing from this utility model, and these improvements and additions should also be considered within the protection scope of this utility model. Any modifications, alterations, and equivalent changes made by those skilled in the art based on the above-disclosed technical content without departing from the spirit and scope of this utility model are equivalent embodiments of this utility model. Furthermore, any modifications, alterations, and evolutions made to the above embodiments based on the essential technology of this utility model still fall within the scope of the technical solution of this utility model.
Claims
1. A device for measuring the coordinates of an internal hole chamfer, characterized in that, include, Measuring hole sleeve, which is the central hole sleeve body; The dial indicator is detachably and securely mounted on the top of the measuring hole sleeve; the measuring rod of the dial indicator is located inside the hollow cavity of the measuring hole sleeve. The measuring shaft is movably installed in the hollow cavity of the measuring hole sleeve and can move up and down along the axial direction of the measuring hole sleeve. Its top surface contacts the measuring rod of the dial indicator. The working end of the measuring shaft extends vertically downward beyond the bottom of the measuring hole sleeve, and the bottom edge of the working end forms a chamfered bevel. A vertical guide part coaxial with it is formed on the bottom surface of the working end of the measuring shaft. The outer diameter of the guide part matches the inner diameter of the workpiece to be measured, guiding the chamfered bevel to contact the chamfer of the inner diameter of the workpiece to be measured. In use, the chamfered bevel contacts the chamfered surface of the inner hole of the workpiece to be measured, the measuring rod is subjected to force, and the axial coordinate of the chamfer of the inner hole of the workpiece to be measured is obtained through the pointer of the dial indicator.
2. The internal hole chamfer coordinate measuring device as described in claim 1, characterized in that, The top of the measuring hole sleeve is detachably and fixedly connected to a pressure cover for fixing the dial indicator, and the measuring rod of the dial indicator passes through the pressure cover and contacts the top surface of the measuring shaft.
3. The internal hole chamfer coordinate measuring device as described in claim 2, characterized in that, There is a gap between the pressure cap and the measuring shaft. A compression spring is installed in this gap. One end of the compression spring contacts the bottom surface of the pressure cap, and the other end contacts the top surface of the measuring shaft. The spring uses its own elasticity to provide preload and reset force to the measuring shaft.
4. The internal hole chamfer coordinate measuring device as described in claim 1, characterized in that, The measuring shaft and the measuring hole sleeve are fitted with a clearance.
5. The internal hole chamfer coordinate measuring device as described in claim 1, characterized in that, The guide section is a stepped shaft.
6. The internal hole chamfer coordinate measuring device as described in claim 1, characterized in that, The measuring sleeve is cylindrical, with the opening diameter at its bottom end face being smaller than the outer diameter of the measuring shaft but larger than the outer diameter of the working end, thus confining the measuring shaft within the hollow cavity of the measuring sleeve.