A novel punch for machining D-type holes

Abstract

This utility model discloses a novel punch for machining D-shaped holes, belonging to the field of machining tool technology. The punch includes a punch body with a through-hole for venting air during punching, preventing machining problems and punch breakage. Its cross-section is D-shaped, rectangular, or hexagonal, adaptable to various machining needs. The punch body is stepped to distribute the cutting layer, reducing cutting force and minimizing punch breakage. This invention solves the problems of low efficiency, high cost, and easy breakage in existing D-shaped hole machining, achieving efficient, low-cost, and stable machining, expanding its application range, and improving machining quality and production efficiency.

Description

Technical Field

[0001] This utility model relates to the field of machining tools, specifically to a novel D-hole machining punch, mainly used for machining non-through D-holes in transmission linkages of electric sofas and electric beds, in order to solve the problems of low efficiency, high cost, and easy breakage of punches in existing machining processes. Background Technology

[0002] In the manufacturing of electric sofas and electric beds, D-shaped holes need to be machined on the transmission links used in the ejection mechanism. However, traditional D-shaped hole machining methods are difficult to apply to the machining requirements of this type of transmission link.

[0003] 1. D-shaped holes on gears can be machined by cold forging or laser cutting because they are through holes. However, D-shaped holes on transmission connecting rods are not through holes, so these two machining methods are not applicable.

[0004] 2. Currently, the only processing method available online for non-through D-type holes is electrical discharge machining, but this method has the drawback of extremely high cost;

[0005] 3. In some solutions that use punching technology, the air below cannot be discharged during the punching process due to the tight fit of the punching action, which affects the processing quality. In addition, the traditional punch is D-shaped columnar, and the cutting layer is too thick during processing, which makes the punch very easy to break, seriously affecting processing efficiency and production stability.

[0006] Furthermore, the commonly used electrical discharge machining (EDM) process is not only inefficient and costly, but also limited by the discharge source, restricting the machining depth to no more than 15 mm, which fails to meet the processing requirements of some products. Therefore, developing a new type of D-hole machining punch that can overcome the above problems has become an urgent technical challenge to be solved in related fields. Utility Model Content

[0007] The purpose of this invention is to provide a novel punch for machining D-holes, which solves the problems of low efficiency, high cost, and easy breakage of punches in existing D-hole machining, and achieves efficient, low-cost, and stable machining of non-through D-holes.

[0008] The above-mentioned objective of this utility model is achieved through the following technical solution: a novel D-type hole machining punch, comprising a punch body, wherein the punch body is provided with a through-hole extending from top to bottom. During the punching process, the vent hole can effectively discharge the air below the punching area, avoiding processing problems caused by the inability to discharge air, while reducing the internal pressure of the punch and reducing the risk of punch breakage.

[0009] Furthermore, the punch body has various cross-sectional shapes, such as D-shaped, rectangular, or hexagonal. Different cross-sectional shapes can adapt to different processing requirements, improving the versatility and applicability of the punch.

[0010] Furthermore, the punch body is designed in a stepped shape, and can be designed with two, three, or even more steps according to actual processing requirements. By designing the punch body in a stepped shape, the originally thick cutting layer can be distributed, making the cutting layer thinner with each processing step, thereby reducing the cutting force borne by the punch during processing, further reducing the possibility of punch breakage, and improving the service life and processing stability of the punch.

[0011] Compared with the prior art, the beneficial effects of this utility model are:

[0012] 1. Improved processing efficiency: Compared with electrical discharge machining, this punch, when used with a punch press, can quickly complete the machining of D-shaped holes, significantly shortening the processing time, improving production efficiency, and meeting the needs of mass production.

[0013] 2. Reduced processing costs: It avoids the high cost problem of electrical discharge machining, and at the same time, by optimizing the punch structure to reduce punch breakage and loss, the overall processing cost is reduced and the economic benefits of enterprises are improved.

[0014] 3. Improved processing quality: The venting holes effectively solve the problem of air not being able to escape during punching, ensuring the stability of the processing, reducing processing defects, and improving the processing quality of D-shaped holes.

[0015] 4. Enhanced punch durability: The stepped punch body design distributes the cutting layer thickness, reduces the cutting force on the punch, significantly reduces the occurrence of punch breakage, extends the punch service life, and reduces the frequency and time cost of punch replacement.

[0016] 5. Expanded application range: The various cross-sectional shapes and adjustable stepped design enable this punch to adapt to the machining of D-holes of different sizes and requirements, thus expanding its application range in the field of machining. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model.

[0018] Figure 2 yes Figure 1 A bottom view.

[0019] Figure 3 This is a schematic diagram of the processing steps of this utility model. Detailed Implementation

[0020] The present invention will now be described in further detail with reference to the accompanying drawings.

[0021] Example 1:

[0022] like Figure 1 , Figure 2 and Figure 3 As shown in the figure, this embodiment of a novel D-type hole machining punch includes a punch body 1. The punch body 1 is made of high-strength high-speed steel and strengthened by a special heat treatment process, possessing excellent hardness and wear resistance, which can meet the requirements of long-term, high-intensity processing. The cross-section of the punch body 1 is D-shaped, and its contour dimensions strictly match the specifications of the D-type hole of the transmission connecting rod to be processed, ensuring machining accuracy. The punch body 1 has vent holes 2 with a diameter of 2mm through it from top to bottom. These vent holes 2 can quickly discharge air during the punching process, preventing the pressure caused by air accumulation from affecting the machining quality and punch performance.

[0023] The punch body 1 has a three-tiered stepped structure. The first tier 3 is 2mm long and has the largest diameter, serving as the initial cutting section to quickly remove most of the machining allowance. The second tier 4 is 3mm long and has a slightly smaller diameter than the first tier 3, further refining the cutting process and optimizing the hole shape. The third tier, the punch rod, is 5mm long and has the smallest diameter, undertaking the fine cutting task to ensure the dimensional accuracy and surface finish of the D-shaped hole. This stepped design, with its gradually decreasing diameter from short to long, evenly distributes the cutting force throughout the machining process, greatly reducing the load of a single cut.

[0024] When machining the non-through D-shaped hole in the transmission linkage 5 of the electric sofa, a small hole is first drilled at a predetermined position using a lathe, with the hole diameter precisely corresponding to the dimension from the tangent of the D-shaped hole to the inner center. Then, the punch is installed on the punch press, and the stamping process is started. During stamping, air is rapidly discharged from the vent 2, maintaining stable pressure in the cutting area; the three-stage stepped structure gradually thins the cutting layer, significantly reducing the instantaneous impact force on the punch. Actual verification shows that this punch performs stably in batch processing, without any breakage. The dimensional error of the machined D-shaped hole is controlled within a very small range, and the surface is smooth and flat. Compared to traditional processing methods, production efficiency is increased by approximately 80%, and processing costs are reduced by approximately 60%, significantly improving production efficiency and product quality.

[0025] Based on Example 1, the specific processing procedure is as follows:

[0026] Fix the transmission linkage of the electric sofa to be processed on the worktable of the punch press, ensuring its position is accurate and stable to prevent displacement during processing that could affect machining accuracy. Start the lathe and drill a small hole at the position of the D-shaped hole on the transmission linkage according to the predetermined dimensional parameters. The diameter of this small hole is the dimension from the tangent of the D-shaped hole to the inner center of the circle. This step prepares for subsequent punching processing.

[0027] After drilling is completed, the designed new D-type hole-machining punch is installed on the punch press, and the position of the punch is adjusted to precisely align with the small hole on the transmission connecting rod. The punching parameters of the punch press are set, including punching pressure and punching speed. According to the punch material, transmission connecting rod material and processing requirements, the punching pressure is set within an appropriate range to ensure smooth punching of the material, while avoiding excessive pressure that could damage the punch or deform the material.

[0028] Once everything is ready, the punch press is started, and the punch begins to press downwards. The first step first contacts the drive linkage; due to its larger diameter, it can quickly remove a significant amount of material, completing the initial cutting work. As the punch continues to press down, the second step follows, further refining and machining the shape of the hole, making its contour closer to a D-shape. Finally, the third step (the punch rod) completes the finish cutting, ensuring that the dimensional accuracy and surface quality of the D-shaped hole meet the design requirements. Throughout the entire punching process, the venting holes on the punch body continuously function, promptly expelling air from below to ensure a smooth punching process.

[0029] After stamping, the punch is lifted, the machined transmission link is removed, and the D-hole is inspected, including measuring the hole diameter, checking the shape accuracy and surface roughness. If the inspection results meet the requirements, the transmission link is completed; if errors or defects exist, they are corrected or re-machined as needed. Through the above processing, using the new type of D-hole machining punch, the machining task of non-through D-holes in electric sofa transmission links can be completed efficiently and with high quality.

[0030] Example 2:

[0031] The punch body in this embodiment has a rectangular cross-section, making it suitable for machining holes with special shape requirements. The punch body also features a through-hole vent, with a diameter adjusted to 2.5 mm. The punch body is designed in a three-step shape, with step lengths of 3 mm, 4 mm, and 7 mm respectively.

[0032] When machining non-standard holes in the transmission linkage of an electric machine tool, the machining process follows a step of drilling first and then punching. During the punching process, the vent effectively discharges air, and the three-stage stepped punch body reasonably distributes the cutting layer, allowing the punch to complete the machining task under relatively small cutting forces. Testing showed that the machined holes have high precision and good surface quality. The punch maintained good performance even after multiple machining operations, without any breakage or other damage, fully verifying the practicality and reliability of this punch.

[0033] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A novel D-hole machining punch characterized by: The punch body is provided with an exhaust hole penetrating from top to bottom.

2. The novel D-hole machining punch according to claim 1, characterized in that: The cross section of the punch body is D-shaped, rectangular or hexagonal.

3. The novel D-hole machining punch according to claim 1, characterized in that: The punch body is arranged in a stepped shape.

4. The novel D-hole machining punch according to claim 3, characterized in that: The punch body is two-step or three-step.

Images