Marking fixture for countersunk bolts to prevent scratches on the angled surface

Abstract

This invention discloses a marking fixture for countersunk bolts to prevent scratches on the countersunk surface, comprising a bushing (1), a sleeve (2), a positioning pin screw (3), and a positioning nut (4). The sleeve (2) has a bushing (1) installed at its upper end, and the positioning pin screw (3) is screwed with the positioning nut (4) for connection. The lower end of the sleeve (2) is screwed with the positioning pin screw (3) for connection. This invention prevents scratches on the countersunk surface of countersunk bolts during pneumatic marking, improving the surface quality of the product parts and making it convenient to use.

Description

Technical Field

[0001] This invention belongs to the field of tooling technology, specifically relating to a marking tool for preventing scratches on the angled surface of countersunk bolts. Background Technology

[0002] In recent years, with the rapid development of the standard parts industry, the market demand for standard bolt products has been increasing, and the market's requirements for product quality have become increasingly stringent, especially for product appearance quality. It is understood that countersunk bolts on the market often have scratches on the countersunk surface. After investigation and verification, it was found that the scratches on the countersunk surface were caused by the marking process, as the countersunk angle surface was scratched due to the vibration of the marking. Summary of the Invention

[0003] The purpose of this invention is to overcome the above-mentioned shortcomings and provide a marking fixture for countersunk bolts that prevents the countersunk surface from being scratched during pneumatic marking, improves the surface quality of product parts, and is easy to use, thus preventing scratches on the angle surface of the countersunk bolts.

[0004] The objective of this invention and the solution to its main technical problem are achieved by the following technical solutions:

[0005] The present invention provides a marking fixture for preventing scratches on the angled surface of countersunk bolts, comprising a bushing, a sleeve, a positioning pin screw, and a positioning nut, characterized in that: a bushing is installed on the upper end of the sleeve, a positioning nut is screwed into the positioning pin screw for connection, and a positioning pin screw is screwed into the lower end of the sleeve for connection.

[0006] The bushing is larger at the top and smaller at the bottom, and has a through hole inside. The bottom end is inserted into the upper end of the sleeve for connection.

[0007] The sleeve has a larger outer diameter in the middle and smaller outer diameters at both ends. It has holes at the upper and middle inner ends and a threaded hole at the lower end. The holes at the upper and middle inner ends are connected to the threaded hole at the lower end. The diameter of the holes at the upper and middle inner ends is larger than the diameter of the threaded hole at the lower end.

[0008] The positioning push rod screw can rotate and move up and down within the sleeve.

[0009] Compared with existing technologies, this invention has significant advantages. As can be seen from the above technical solution: by inserting the countersunk bolt into the bushing inner hole of the sleeve head, adjusting the positioning pin screw according to the product length requirements, and using the upper end face of the positioning pin screw to support the lower tail of the countersunk bolt, the head of the countersunk bolt is suspended above the bushing end face, with no contact surface on the countersunk surface, thus avoiding stress; tightening the nut, and then manually squeezing the countersunk bolt shank against the bushing for marking. This invention can be applied to countersunk bolts of different specifications. The sleeve and positioning pin screw require high hardness and wear resistance materials; the bushing needs to be made of a softer material to protect the countersunk bolt shank from scratches; the positioning nut can be a regular nut. Utilizing the force generated by vibration at the bottom, the countersunk angle surface avoids contact with the tooling, thereby preventing scratches on the countersunk bolt angle surface due to marking vibration. This ensures that the countersunk surface of the countersunk bolt is not scratched during pneumatic marking, improving the surface quality of the product parts and making it convenient to use. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the structure of the present invention;

[0011] Figure 2 This is the front view of the present invention;

[0012] Figure 3 This is a schematic diagram of the structure of the bushing of the present invention;

[0013] Figure 4 This is a schematic diagram of the structure of the sleeve of the present invention;

[0014] Figure 5 This is a schematic diagram of the positioning push rod screw of the present invention;

[0015] Figure 6 This is a diagram showing the usage state of the present invention.

[0016] Markings in the figure

[0017] 1. Bushing, 2. Sleeve, 3. Locating pin screw, 4. Locating nut, 5. Countersunk bolt. Detailed Implementation

[0018] The following detailed description, in conjunction with the accompanying drawings and preferred embodiments, provides a detailed account of the specific implementation methods, structures, features, and effects of the present invention.

[0019] This invention discloses a marking fixture for preventing scratches on the angled surface of countersunk bolts, comprising a bushing 1, a sleeve 2, a positioning push rod screw 3, and a positioning nut 4. The upper end of the sleeve 2 is fitted with the bushing 1, and the positioning push rod screw 3 is screwed into the positioning nut 4 for connection. The lower end of the sleeve 2 is also screwed into the positioning push rod screw 3 for connection. The bushing 1 is wider at the upper end and narrower at the lower end, with a through hole inside, and its lower end is inserted into the upper end of the sleeve 2 for connection. The outer surface of the sleeve 2 is wider in the middle and narrower at both ends, with holes at the upper and middle parts of the interior, and a threaded hole at the lower end. The holes at the upper and middle parts of the interior communicate with the threaded hole at the lower end, and the diameter of the holes at the upper and middle parts of the interior is larger than the diameter of the threaded hole at the lower end. The positioning push rod screw 3 can rotate and move up and down within the sleeve 2. A step is designed in the middle of the outer part of the sleeve 2 for marking the clamping and positioning of the tooling fixture. Holes are provided at the upper and middle parts of the inside of the sleeve 2, and a threaded hole is provided at the lower end. The holes at the upper and middle parts communicate with the threaded hole at the lower end, and the diameter of the holes at the upper and middle parts is larger than the diameter of the threaded hole at the lower end. This is used to install the positioning push rod screw 3. The positioning push rod screw 3 is a fully threaded long screw. After screwing in a positioning nut 4, it is screwed into the sleeve 2, rotating into the cavity of the sleeve 2 through the thread. The top end face of the positioning push rod screw 3 supports the lower end face of the countersunk bolt 5, thus providing a positioning function. The length of the positioning push rod screw 3 screwed into the cavity of the bushing 1 is adjusted according to the length of the countersunk bolt 5. After adjusting the length of the positioning push rod screw 3, the nut 4 is tightened to lock the position of the positioning push rod screw 3. The bushing 1 is larger at the upper end and smaller at the lower end, and has a through hole inside. The lower end is inserted into the upper end of the sleeve 2 for connection. Installed on the head of sleeve 2, the step is to rest on the head of sleeve 2 to prevent bushing 1 from slipping into the sleeve cavity. The inner hole of bushing 1 is larger than the major diameter of the thread 3 of the push rod screw and the shank diameter of the countersunk bolt 5.

[0020] When using, please refer to Figure 6 Insert the countersunk bolt 5 into the inner hole of the bushing 1 at the head of the sleeve 2. Adjust the positioning pin screw 3 according to the required product length. Use the upper end face of the positioning pin screw 3 to support the lower end of the countersunk bolt 5, so that the head of the countersunk bolt 5 is suspended above the end face of the bushing 1, with no contact surface between the countersunk bolt and the bushing 1, and is not subjected to force. Tighten the lock nut 4, and squeeze the shank of the countersunk bolt 5 against the bushing 1 by hand to mark it. This method can be applied to countersunk bolts 5 of different specifications.

[0021] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments without departing from the technical essence of the present invention shall still fall within the scope of the present invention.

Claims

1. A marking fixture for preventing scratches on the angled surface of a countersunk bolt, comprising a bushing (1), a sleeve (2), a positioning push rod screw (3), and a positioning nut (4), characterized in that; A bushing (1) is installed on the upper end of the sleeve (2), and a positioning nut (4) is screwed into the positioning top screw (3) for connection. The positioning top screw (3) is screwed into the lower end of the sleeve (2) for connection. The inner hole of the bushing (1) is larger than the major diameter of the positioning top screw (3) and the diameter of the rod of the countersunk bolt (5) to prevent contact with the countersunk angle surface during marking. The positioning nut (4) is used to fix the position of the positioning top screw (3) to prevent vibration during marking from causing loosening.

2. The marking fixture for preventing scratches on the angled surface of countersunk bolts as described in claim 1, characterized in that; The bushing (1) is larger at the top and smaller at the bottom, and has a through hole inside. The lower end is inserted into the upper end of the sleeve (2) for connection.

3. The marking fixture for preventing scratches on the angled surface of countersunk bolts as described in claim 1, characterized in that; The sleeve (2) has a large outer middle and small two ends. The upper and middle parts of the inner part are provided with holes, and the lower part is provided with a threaded hole. The holes provided at the upper and middle parts of the inner part are connected to the threaded hole provided at the lower part. The diameter of the holes provided at the upper and middle parts of the inner part is larger than the diameter of the threaded hole provided at the lower part.

4. The marking fixture for preventing scratches on the angled surface of countersunk bolts as described in claim 1, characterized in that; The positioning top screw (3) can rotate and move up and down within the sleeve (2).

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