A clamping device for machining small-diameter countersunk screw caps

Abstract

This utility model discloses a clamping device for machining small-diameter countersunk screws and nuts, including a base, a pressure plate connected to the upper surface of the base by a locking screw, and a screw fixing block positioned between the pressure plate and the upper surface of the base. The outer ring of the pressure plate has a set of stepped cylindrical through holes with a smaller upper diameter and a larger lower diameter. The shape of the screw fixing block matches the inner shape of the stepped cylindrical through holes of the pressure plate, and a screw positioning hole is formed in the center of the screw fixing block. The screw fixing block is installed in the stepped cylindrical through holes of the pressure plate, and the lower end of the locking screw passes through a bolt hole in the pressure plate and connects to a bolt hole in the base, thus clamping and fixing the screw fixing block. This utility model's clamping device solves the problem of difficult clamping when machining small-diameter screws and nuts.

Description

Technical Field

[0001] This utility model relates to a clamping device for machining small-diameter countersunk screws and nuts, belonging to the technical field of clamping devices for nut machining. Background Technology

[0002] Screws are common fasteners widely used in machinery, electrical appliances, and construction. Countersunk screws are used in parts where the head cannot protrude from the product surface, therefore, the requirements for the external dimensions and inner hole of the nut are relatively high. Traditional nut forming technology is stamping, which stamps the nut's shape and inner hole in one go. However, for small-batch, non-standard parts processing, there is a problem of high equipment investment costs.

[0003] When machining large-diameter countersunk screws and nuts, a three-jaw chuck can be used to directly fix the screw and thus machine the nut. However, using a three-jaw chuck to fix small-diameter (M2~M10) screws presents the following problems: 1. Excessive clamping force can easily wear down the thread crest, affecting thread accuracy; 2. Insufficient clamping force can easily lead to unstable screw positioning, resulting in decreased machining accuracy or even scrapping of the part. Utility Model Content

[0004] The purpose of this utility model is to solve the problems of difficult clamping, low precision, and high scrap rate in the processing of small-diameter countersunk screws and nuts for small batches and non-standard parts, and to provide a clamping device for processing small-diameter countersunk screws and nuts.

[0005] The objective of this utility model is achieved through the following technical solution:

[0006] This utility model discloses a clamping device for machining small-diameter countersunk screws and nuts, including a base, a pressure plate connected to the upper plate of the base by a locking screw, and a screw fixing block positioned between the pressure plate and the upper plate of the base;

[0007] A bolt hole is provided at the center of the upper surface of the base;

[0008] The pressure plate has a bolt through hole in the center, and a set of stepped cylindrical through holes with a small upper diameter and a large lower diameter are distributed on the outer ring of the pressure plate.

[0009] The outer shape of the screw fixing block matches the inner shape of the stepped cylindrical through hole of the pressure plate, and a screw positioning hole is opened in the center of the screw fixing block.

[0010] The screw fixing block is installed in the stepped cylindrical through hole of the pressure plate. The lower end of the locking screw passes through the bolt through hole of the pressure plate and is connected to the bolt hole of the base, so that the screw fixing block is pressed and fixed.

[0011] Both the pressure plate and the base have corresponding guide holes, and guide pins are inserted into the guide holes of the pressure plate and the base to make them circumferentially positioned.

[0012] The mating surface between the pressure plate and the base is grooved and fitted with a spring, which facilitates the separation of the pressure plate from the base during disassembly.

[0013] Work process

[0014] After clamping and fixing the base on the machining center, screw the screws to be machined into the screw positioning holes of the screw fixing block. Then, machine the outer shape and inner hole of the screw's nut. After machining, remove the guide post and the locking screw. With the assistance of the spring force, the pressure plate can be easily removed from the base. Finally, remove the machined screw from the screw positioning holes of the screw fixing block. When machining other types of screws, simply replace the screw fixing block with one whose screw positioning hole matches the screw to be machined, and repeat the above operation to complete the machining of the new screw's nut shape and inner hole.

[0015] Beneficial effects

[0016] The clamping device of this utility model has a simple structure and is easy to use. It can be used for machining the outer shape and inner hole of small-diameter countersunk screws and nuts of various specifications. It can effectively clamp the screw rod of small-diameter screws to process the nuts, solving the problem of difficult clamping when machining small-diameter screws and nuts, and greatly improving the machining accuracy and pass rate of parts. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the clamping device of this utility model;

[0018] Figure 2 This is a top view of the clamping device of this utility model;

[0019] Among them, 1-base, 2-pressure plate, 3-screw fixing block, 4-locking screw, 5-guide pin, 6-spring. Detailed Implementation

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0021] Example

[0022] like Figure 1 , 2 As shown, a clamping device for processing small-diameter countersunk screws and nuts according to the present invention includes a base 1, a pressure plate 2 connected to the upper surface of the base 1 by a locking screw 4, and a screw fixing block 3 positioned between the pressure plate 2 and the upper surface of the base 1.

[0023] A bolt hole is provided at the center of the upper surface of the base 1;

[0024] The center of the pressure plate 2 has a bolt through hole, and the outer ring of the pressure plate 2 has a set of stepped cylindrical through holes with a small upper diameter and a large lower diameter.

[0025] The outer shape of the screw fixing block 3 matches the inner shape of the stepped cylindrical through hole of the pressure plate 2, and the screw fixing block 3 has a screw positioning hole in the center.

[0026] The screw fixing block 3 is installed in the stepped cylindrical through hole of the pressure plate 2. The lower end of the locking screw 4 passes through the bolt through hole of the pressure plate 2 and is connected to the bolt hole of the base 1, so that the screw fixing block 3 is pressed and fixed.

[0027] Both the pressure plate 2 and the base 1 have corresponding guide holes. Guide pins 5 are inserted into the guide holes of the pressure plate 2 and the base 1 to make them circumferentially positioned.

[0028] A spring 6 is installed in the groove on the mating surface of the pressure plate 2 and the base 1 to facilitate the separation of the pressure plate 2 and the base 1 during disassembly.

[0029] Work process

[0030] After clamping and fixing the base on the machining center, screw the screws to be processed into the screw positioning holes of the screw fixing block 3. Then, machine the nut shape and inner hole of the screws to be processed. After machining, remove the guide post and the locking screw. With the help of the spring force of the spring 6, the pressure plate 2 can be easily removed from the base 1. Finally, remove the machined screw from the screw positioning holes of the screw fixing block 3. When machining other types of screws, simply replace the screw fixing block 3 with one whose screw positioning hole matches the screw to be processed, and repeat the above operation to complete the machining of the nut shape and inner hole of the new screw.

Claims

1. A clamping device for machining small-diameter countersunk screws and nuts, characterized in that, Includes a base, a pressure plate connected to the upper plate of the base by locking screws, and a screw fixing block positioned between the pressure plate and the upper plate of the base; A bolt hole is provided at the center of the upper surface of the base; The pressure plate has a bolt through hole in the center, and a set of stepped cylindrical through holes with a small upper diameter and a large lower diameter are distributed on the outer ring of the pressure plate. The outer shape of the screw fixing block matches the inner shape of the stepped cylindrical through hole of the pressure plate, and a screw positioning hole is opened in the center of the screw fixing block. The screw fixing block is installed in the stepped cylindrical through hole of the pressure plate. The lower end of the locking screw passes through the bolt through hole of the pressure plate and is connected to the bolt hole of the base, so that the screw fixing block is pressed and fixed.

2. The clamping device for machining small-diameter countersunk screws and nuts as described in claim 1, characterized in that, Both the pressure plate and the base have corresponding guide holes, and guide pins are inserted into the guide holes of the pressure plate and the base to make them circumferentially positioned.

3. A clamping device for machining small-diameter countersunk screws and nuts as described in claim 1 or 2, characterized in that, A spring is installed in the groove on the mating surface between the pressure plate and the base.

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