Boring positioning device applied to high-precision stepped hole of photoelectric meter base

Abstract

The utility model belongs to the technical field of machining, and particularly relates to a boring positioning device applied to a high-precision stepped hole of a photoelectric meter base. The device comprises a base, a positioning pin and a limiting column, a circular boss is arranged in the middle of the working surface in the coaxial direction of the base and is in clearance fit with the lower end of the through hole of the sample piece; the working surface of the base except the circular boss is used as a small step surface, a slender groove is formed in the small step surface along the eccentric position, and the slender groove is in clearance fit with the triangular boss of the sample piece; the small step surface is in contact with the special-shaped boss of the sample piece; the slender groove is in clearance fit with the triangular boss of the sample piece; the triangular boss is higher than the special-shaped boss; the head part of the positioning pin is inserted into the through hole of the sample piece from the upper part and is in clearance fit with the upper end of the through hole; the positioning pin can accurately guide the position of the pressing plate; and the limiting column is in clearance fit with the sample piece pin hole and the base limiting hole below the sample piece pin hole.

Description

Technical Field

[0001] This utility model belongs to the field of machining technology, and specifically relates to a boring and positioning device for high-precision stepped holes in the base of a photoelectric accelerator. Background Technology

[0002] The base is a core component of the silicon pendulum photoelectric accelerometer, serving as the assembly base for the accelerometer's precision parts. The manufacturing precision of the base directly affects the accelerometer's assembly accuracy and performance indicators. For example... Figure 3 As shown, the base consists of a triangular boss, an irregularly shaped boss, threaded holes, pin holes, and stepped holes. The triangular boss is slightly higher than the irregularly shaped boss, making it difficult to use a large surface for positioning when boring the stepped holes. The irregularly shaped boss, as the positioning surface, is relatively small, making the base prone to wobbling. The distance between the pin hole wall and the φ6.85 hole wall is only 0.575mm, and the distance between the pin hole wall and the second-stage stepped hole φ7.9 is only 0.05mm. Errors in the mounting and positioning of the base will cause the hole wall to penetrate, leading to localized magnetic leakage in the accelerometer, directly affecting the product's machining quality and performance indicators. Utility Model Content

[0003] The purpose of this invention is to address the shortcomings of existing technologies by designing and manufacturing a boring and positioning device for high-precision stepped holes in silicon pendulum photoelectric accelerometer base parts. This device sinks a triangular boss that interferes with the positioning surface into a groove; uses a positioning pin to guide the pressure plate to quickly align and tighten, while preventing interference between the tool and the pressure plate after the pin is pulled out; a limiting post restricts the slight displacement of the base; it is easy to clamp, stable, and reliable; and greatly improves the manufacturing precision of the stepped holes in the base.

[0004] The technical solution of this utility model is:

[0005] A boring and positioning device for a high-precision stepped hole in a photoelectric accelerometer base is provided, comprising a base, a positioning pin, and a limiting column;

[0006] A circular boss is provided in the middle of the coaxial working surface of the base, and the circular boss is clearance-fitted with the lower end of the through hole of the sample; the working surface of the base other than the circular boss is a small step surface, and a slender groove is opened along the eccentric position of the small step surface, and the slender groove is clearance-fitted with the triangular boss of the sample; the small step surface contacts the irregular boss of the sample; the slender groove is clearance-fitted with the triangular boss of the sample; the triangular boss is higher than the irregular boss;

[0007] The head of the positioning pin is inserted into the through hole of the sample from above, and is clearance-fitted with the upper end of the through hole; the positioning pin can accurately guide the position of the pressure plate; the limiting post is clearance-fitted with the pin hole of the sample and the limiting hole of the base below the pin hole of the sample.

[0008] Furthermore, the head diameter of the positioning pin is slightly larger than the target value of the grading hole by about 0.3 mm. After the pressure plate is pressed tightly, the tool and the pressure plate do not interfere when boring the grading hole.

[0009] Furthermore, the positioning pin is removed after the pressure plate positioning is completed and before the grading hole is machined.

[0010] Furthermore, the positioning pin has symmetrical pressure plate guide symbols near the positioning surface of the sample to accurately guide the position of the pressure plate.

[0011] Furthermore, the limiting post is clearance-fitted with the limiting hole of the base and positioned at three points with the circular boss of the base, quickly fixing the sample to the correct position and avoiding interference and penetration with the closely spaced threaded hole when boring the graded hole.

[0012] Furthermore, the base has a large hole on its bottom surface, which makes the contact surface with the processing platform almost a line contact, thus improving positioning accuracy.

[0013] Beneficial effects: This invention provides a boring positioning device for high-precision stepped holes in the base of an optoelectronic accelerator. The device is easy and quick to clamp and position, enabling rapid positioning of the boring machine. It avoids the machining quality problems of high-precision stepped holes caused by small positioning surfaces and boss height differences in the base, thereby improving the rapid and effective positioning of the boring machine and increasing machining efficiency and consistency. Attached Figure Description

[0014] Figure 1 This is a cross-sectional view of the boring positioning device;

[0015] Figure 2 This is a schematic diagram of the base;

[0016] Figure 3 This is a schematic diagram of the sample.

[0017] Figure 4 This is a schematic diagram of a locating pin;

[0018] Figure 5 This is a schematic diagram of the limiting post;

[0019] Figure 6 This is a cross-sectional view of the stepped hole in the base component.

[0020] Attached diagram descriptions: 1-Base, 2-Sample, 3-Positioning pin, 4-Limiting post Detailed Implementation

[0021] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments:

[0022] like Figure 6As shown, the base has four stepped holes. The φ6.85 hole is the reference hole, with threaded holes and pin holes located close to each other on either side. During boring, the diameter of the stepped holes increases. The pin hole wall is only 0.575mm from the φ6.85 reference hole wall and only 0.05mm from the second-stage stepped hole φ7.9. The threaded hole wall is only 0.15mm from the second-stage stepped hole φ7.9. The irregularly shaped boss on the base serves as a positioning surface, but its contact area is small. There is a height difference with the triangular boss, causing interference. Clamping and positioning accuracy is particularly important, directly affecting the quality of the base hole walls and product performance indicators.

[0023] like Figure 1-2 As shown, a boring and positioning device for a high-precision stepped hole in a photoelectric accelerator base includes four parts: a base 1, a positioning pin 3, and a limiting column 4.

[0024] The base 1 has a circular boss in the coaxial direction, and the circular boss is in clearance fit with the through hole of the sample 2; the small stepped surface of the base 1 has a slender groove at an eccentric position, and the slender groove is in clearance fit with the higher triangular boss of the sample 2; the small stepped surface of the base 1 contacts the irregular boss; the slender groove is in clearance fit with the triangular boss of the sample 2.

[0025] like Figure 4 As shown, the positioning pin 3 has a clearance fit with the through hole of the sample 2; the positioning pin 3 can accurately guide the position of the pressure plate; the limiting post 4 has a clearance fit with the pin hole of the sample 2 and the limiting hole of the base. The head diameter of the positioning pin 3 is slightly larger than the target value of the grading hole by about 0.3 mm. After the pressure plate is pressed tightly, the tool and the pressure plate do not interfere with each other when boring the grading hole. The positioning pin 3 is removed after the pressure plate is positioned and before the grading hole is machined.

[0026] The base 1, positioning pin 3, and limiting column 4 are made of tin bronze wear-resistant material.

[0027] The positioning pin 3 has symmetrical pressure plate guide symbols near the positioning surface of the sample 2, which can accurately guide the position of the pressure plate.

[0028] like Figure 5 As shown, the limiting post 4 is clearance-fitted with the limiting hole of the base 1 and is positioned at three points with the circular boss of the base 1, quickly fixing the sample 2 to the correct position and avoiding interference and penetration with the threaded hole that is very close when boring the graded hole.

[0029] The triangular boss of the sample 2 is recessed into the slender groove of the base, with clearance fit, to avoid assembly interference when the positioning surface of the sample contacts the positioning surface of the base 1.

[0030] The base 1 has a large hole on its large end face, which makes the contact surface with the processing platform close to line contact, thus improving positioning accuracy.

[0031] Example

[0032] A boring and positioning device for high-precision stepped holes in base-type parts includes four parts: a base 1, a positioning pin 3, and a limiting post 4. The circular boss of the base 1 is in clearance fit with the through hole of the sample 2; the slender groove of the base 1 is in clearance fit with the higher triangular boss of the sample 2; the positioning pin 3 is in clearance fit with the through hole of the sample 2; the positioning pin 3 can accurately guide the position of the pressure plate; and the limiting post 4 is in clearance fit with the pin hole of the sample 2 and the limiting hole of the base.

[0033] The head diameter of the positioning pin 3 is slightly larger than the target value of the grading hole by about 0.3 mm. After the pressure plate is pressed tightly, the tool and the pressure plate do not interfere when boring the grading hole.

[0034] The positioning pin 3 is removed after the pressure plate positioning is completed and before the graded holes are machined.

[0035] The base 1, positioning pin 3, and limiting column 4 are made of tin bronze wear-resistant material.

[0036] The positioning pin 3 has symmetrical pressure plate guide symbols near the positioning surface of the sample 2, which can accurately guide the position of the pressure plate.

[0037] The limiting post 4 is clearance-fitted with the limiting hole of the base 1 and is positioned at three points with the circular boss of the base 1, quickly fixing the sample 2 to the correct position and avoiding interference and penetration with the threaded hole that is very close when boring the graded hole.

[0038] The triangular boss of the sample 2 is recessed into the slender groove of the base, with clearance fit, to avoid assembly interference when the positioning surface of the sample contacts the positioning surface of the base 1.

[0039] The base 1 has a large hole on its large end face, which makes the contact surface with the processing platform close to line contact, thus improving positioning accuracy.

[0040] In use, install the base of this boring positioning device on the machine tool worktable fixture, ensuring it is level. Insert the through hole of the sample vertically into the circular boss of the base. Rotate the sample until the triangular boss sinks into the slender groove of the base. Rotate the sample for fine adjustments until the pin hole and threaded hole on the irregular boss coincide with the axis of the limiting hole of the base. Insert the limiting pin. Insert the positioning pin into the hole to be machined. Rotate the head of the positioning pin until the guide symbols on the head of the positioning pin are symmetrically located on both sides and parallel to the horizontal coordinate system. Place the pressure plate close to the position indicated by the guide symbols on the wall of the positioning pin, align and press the sample. After confirmation, pull out the positioning pin to complete the boring positioning.

Claims

1. A boring and positioning device for high-precision stepped holes in the base of a photoelectric accelerometer, characterized in that, The device includes a base (1), a positioning pin (3), and a limiting column (4); A circular boss is provided in the middle of the coaxial working surface of the base, and the circular boss is clearance-fitted with the lower end of the through hole of the sample; the working surface of the base other than the circular boss is a small step surface, and a slender groove is opened along the eccentric position of the small step surface, and the slender groove is clearance-fitted with the triangular boss of the sample; the small step surface contacts the irregular boss of the sample; the slender groove is clearance-fitted with the triangular boss of the sample; the triangular boss is higher than the irregular boss; The head of the positioning pin is inserted into the through hole of the sample from above, and is clearance-fitted with the upper end of the through hole; the positioning pin can accurately guide the position of the pressure plate; the limiting post is clearance-fitted with the pin hole of the sample and the limiting hole of the base below the pin hole of the sample.

2. The apparatus according to claim 1, characterized in that, The head diameter of the positioning pin (3) is slightly larger than the target value of the grading hole by about 0.3 mm. After the pressure plate is pressed tightly, the tool and the pressure plate do not interfere when boring the grading hole.

3. The apparatus according to claim 2, characterized in that, The positioning pin (3) is removed after the pressure plate is positioned and before the graded holes are machined.

4. The apparatus according to claim 2, characterized in that, The positioning pin (3) has symmetrical pressure plate guide symbols near the positioning surface of the sample, which accurately guide the position of the pressure plate.

5. The apparatus according to claim 1, characterized in that, The limiting column (4) is clearance-fitted with the limiting hole of the base (1) and positioned at three points with the circular boss of the base, quickly fixing the sample to the correct position and avoiding interference and penetration with the threaded hole that is very close when boring the graded hole.

6. The apparatus according to claim 1, characterized in that, The base has a large hole on its bottom surface, which makes the contact surface with the processing platform almost a line contact, thus improving positioning accuracy.

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