Cucurbita petals convex hole device

Abstract

The invention belongs to the technical field of cold stamping process machining, and particularly relates to a scalloped segment convex hole device which comprises a base, a fixing seat is connected below the base, and a concave die is connected above the base. The upper portion of the female die is connected with the male die. A through hole is formed in the center of the base, and a circular boss is arranged at the bottom of the through hole; the fixing base is installed in the through hole, the bottom of the fixing base is matched with the shape of the circular boss, and the outer wall of the fixing base is attached to the inner wall of the through hole; a plurality of stepped holes are evenly formed in the periphery of the through hole. The die is simple in structure, and the weight and the size are greatly reduced compared with those of a traditional convex hole die; according to the die, the mounting steps of the upper die are reduced, the mounting and debugging process is safe and fast, and the qualified rate of formed parts cannot be reduced.

Description

Technical Field

[0001] This invention belongs to the field of cold stamping processing technology, and specifically relates to a device for creating a melon-shaped protrusion hole. Background Technology

[0002] Launch vehicle flap parts are typically made of aluminum alloy, with flanged holes designed in certain areas. The conventional machining method involves using a double-acting hydraulic press with a large, specialized punching die to create the punches. First, a pre-drilled hole is machined into the part and placed on the die. The outer slide block drives the pressure ring to press the part blank tightly, while the main slide block drives the flanging punch into the pre-drilled hole, causing plastic deformation at the hole edge to form a vertical edge of a certain height. This method involves large die dimensions, a long manufacturing cycle, and one set of dies can only accommodate flanged punches of one position and size, resulting in high production costs.

[0003] Currently, the main domestic patents for melon-shaped convex holes are: CN107695156A, which discloses "a Φ3350mm ellipsoidal melon-shaped normal hole convex hole mold and process", and CN209363400U, which discloses "a Φ3350mm ellipsoidal melon-shaped workpiece convex hole device". The processing method of both is to make a flanged initial hole and then use a hydraulic cylinder main slider to press down and stretch to form the flanged convex hole. One mold can only meet the processing of one hole diameter. Moreover, the main components of the mold still have more than 20 parts, and there is still room for improvement in mold cost and production cycle. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a melon-shaped convex hole device. This invention has a simple structure and its weight and size are significantly reduced compared to traditional convex hole molds. This mold reduces the installation of the upper mold, the installation and debugging process is safe and quick, and the qualified rate of the formed parts will not be reduced.

[0005] To achieve the above objectives, the present invention employs the following technical solutions: A device for creating a melon-shaped perforation includes a base, a fixed seat connected to the lower part of the base, and a concave mold connected to the upper part of the base; a convex mold connected to the upper part of the concave mold; a through hole is provided in the center of the base, and a circular boss is provided at the bottom of the through hole; the fixed seat is installed in the through hole, the bottom of the fixed seat is fitted with the shape of the circular boss, and the outer wall of the fixed seat is fitted with the inner wall of the through hole; a plurality of stepped holes are evenly arranged around the through hole.

[0006] Specifically, a forming hole is provided at the center of the die cavity; the punch is a cone shape with a larger top and a smaller bottom, the diameter of the larger end of the punch is slightly larger than the diameter of the forming hole, and considering the springback factor, the actual punch is taken with the upper deviation of the hole diameter; the diameter of the smaller end of the punch is slightly smaller than the initial hole diameter of the forming hole; the diameter of the forming hole is the same as the diameter of the through hole.

[0007] Specifically, the inner wall of the convex hole fits against the outer wall of the fixing seat, and the top of the fixing seat is lower than the surface of the die, forming a groove with the punch for convex hole forming.

[0008] Specifically, it also includes a pull rod; the end of the pull rod is threaded, and the push rod passes through the fixed seat and the punch in sequence, and its end is fixed with a nut.

[0009] Specifically, the fixed base and the punch have a through hole at their center for connecting the pull rod.

[0010] Specifically, it also includes a push rod, one end of which passes through the stepped hole of the base and contacts the die cavity, and the other end is connected to the hydraulic press air cushion.

[0011] Compared with the prior art, the present invention has the following beneficial effects through the above technical solution: This invention provides a melon-shaped punch mold suitable for punching holes in blanks with a thickness of δ4 to δ10 mm. The entire mold eliminates traditional mold parts such as the upper template, pressure ring, and stripper plate, consisting of only six modules. Different shaped parts can be processed simply by changing the different die surfaces, and punches of different sizes can form flanged holes of various diameters. The punching force is applied by a hydraulic press air cushion instead of the main slider. This invention has a simple structure, is easy and quick to install and debug, and has a wide range of applications. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the device structure of the present invention; Figure 2 This is a schematic diagram of the device structure of the present invention; Figure 3 This is a cross-sectional view of the device structure of the present invention; Figure 4 This is a schematic diagram of the assembled parts of the device of the present invention; Figure 5 This is a schematic diagram illustrating the forming principle of the device of the present invention; In the diagram: 1. Tie rod; 2. Fixing seat; 3. Base; 4. Die; 5. Punch; 6. Nut. Detailed Implementation

[0013] The present invention will now be described in detail with reference to the accompanying drawings.

[0014] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0015] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. It should be noted that the terms "upper," "lower," and similar expressions used herein are for illustrative purposes only and are not intended to be limiting.

[0016] In this document, ordinal numbers such as “first” and “second” used in this application are merely identifiers and do not have any other meaning, such as a specific order. Moreover, for example, the term “first component” does not imply the existence of a “second component”, and the term “second component” does not imply the existence of a “first component”.

[0017] To fully understand the embodiments of the present invention, detailed structures will be presented in the following description. Obviously, the implementation of the embodiments of the present invention is not limited to the specific details familiar to those skilled in the art. Preferred embodiments of the present invention are described in detail below; however, in addition to these detailed descriptions, the present invention may have other embodiments.

[0018] like Figures 1 to 3 As shown, this mold consists of 6 parts. The pull rod 1 has threads machined at its end and is used in conjunction with the fixing seat 2 and nut 6 to press the head of the punch 5 into the part for positioning. The fixing seat 2 has a through hole in the middle for the pull rod 1 to pass through; the outer diameter D2 of the through hole is coordinated with the die 4, providing guidance during forming. The base 3 is used to mount the mold and has 9 holes with a diameter D4 arranged on it; the hole diameter and position are coordinated with the equipment's ejector rod. The die 4 has its contact surface with the part machined according to the part's profile; the hole diameter D1 of the die 4 is coordinated with the outer diameter of the part's flanged hole. The top diameter D3 of the punch 5 is the same as or slightly smaller than the initial flanged hole of the part, used for positioning; the bottom diameter D2 of the punch 5 is coordinated with the inner diameter of the part's flanged hole, generally 0.5mm larger than the inner diameter of the flanged hole, used to control the inner diameter size of the forming flanged hole. The middle hole is a smooth hole, and its diameter is coordinated with the outer diameter of the pull rod 1.

[0019] like Figure 4 The diagram shown is an installation diagram. Figure 5 The diagram shown illustrates the forming principle, where the part is formed as follows: Figure 2 Install it on the mold, tighten the 6th nut, press the orifice part against the surface of the die 4, apply force F to the die 4 through the ejector rod, the die 4 moves upward, driving the part to move upward a distance H, thus forming a downward orifice flange.

[0020] This invention is applicable to the forming of punch holes in blanks with a thickness of δ4 to δ10. The entire mold eliminates traditional mold parts such as upper template, pressure ring, and stripper plate. It consists of only 6 modules and can process parts with different profiles by simply changing different 4-sided concave dies. Different sized punches 5 can form flanged holes of various diameters. The punch forming force is changed from being applied by the main slider to being applied by the equipment air cushion.

[0021] Example 1: For a melon-shaped part made of 2A14-O material with a thickness of 7mm, a flanged hole with a diameter of Φ70mm needs to be formed. The main steps for forming the flanged hole are as follows: 1. Mark the position and use a scribing drill or laser to make the initial flange hole with a size of Φ45mm for the part; 2. Install the mold, place the ejector pin in the ejector hole of the hydraulic press, and then place the mold as shown. Figure 1 Place the assembly on the hydraulic press worktable, ensuring that the ejector rod can smoothly enter the ejector rod hole of the base 3. Note that the punch 5 and nut 6 should not be installed. Use the pressure plate to firmly fix the base 3 on the machine tool worktable.

[0022] 3. Fixing parts; 3.1 Insert the tie rod 1 into the initial hole of the part; and install the punch 5 with an outer diameter of Φ70.5mm and the nut 6 in sequence; 3.2 Tighten nut 6 to ensure that the small end of the punch is pressed into the initial hole of the part for positioning, and that the part surface is basically in contact with the die surface 4; 4. Protruding hole When the air cushion of the equipment is activated, the ejector rod moves upward and applies force to the bottom surface of the die 4. The die 4 moves the part upward together, while the area around the hole cannot move under the constraint of the tie rod 1 and the punch 5. The part and the area around the hole are relatively displaced, thus completing the punch hole.

[0023] Unless otherwise defined, the technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used herein is for descriptive purposes only and is not intended to limit the scope of the invention.

[0024] Terms such as “component” as used herein may refer to a single part or a combination of multiple parts. Terms such as “installation” or “installation” as used herein may refer to a component being directly attached to another component or a component being attached to another component via an intermediary. Features described in one embodiment herein may be applied, alone or in combination with other features, to another embodiment, unless that feature is not applicable in that other embodiment or otherwise stated.

[0025] This invention is not limited to the specific embodiments described above. The invention extends to any new feature or combination disclosed in this specification, as well as any new method or process step or combination disclosed herein.

Claims

1. A device for creating a melon-shaped perforation, characterized in that, Includes a base (3), with a fixed seat (2) connected below the base (3) and a concave mold (4) connected above it; a convex mold (5) is connected above the concave mold (4); a through hole is provided in the center of the base (3), and a circular boss is provided at the bottom of the through hole; the fixed seat (2) is installed in the through hole, and the bottom of the fixed seat (2) fits the shape of the circular boss, and the outer wall of the fixed seat (2) fits the inner wall of the through hole; multiple stepped holes are evenly arranged around the through hole.

2. The melon petal protrusion hole device according to claim 1, characterized in that, The die (4) has a forming hole at its center; the punch (5) is a cone shape with a larger top and a smaller bottom. The diameter of the larger end of the punch (5) is slightly smaller than the diameter of the forming hole, and the diameter of the smaller end is slightly smaller than the diameter of the initial hole of the forming hole; the diameter of the forming hole is the same as the diameter of the through hole.

3. The melon petal protrusion hole device according to claim 2, characterized in that, The inner wall of the forming hole is in contact with the outer wall of the fixing seat (2). The top position of the fixing seat (2) is lower than the surface of the die (4) and forms a groove with the punch (5) for forming the punch hole.

4. The melon petal protrusion hole device according to claim 1, characterized in that, It also includes a pull rod (1); the pull rod (1) has a threaded end, and the pull rod (1) passes through the fixed seat (2) and the punch (5) in sequence, and is fixed at its end with a nut (6).

5. The melon petal protrusion hole device according to claim 4, characterized in that, The center of the fixed base (2) and the punch (5) is provided with a through hole for connecting the pull rod (1).

6. The melon-petal protrusion hole device according to claim 1, characterized in that, It also includes a push rod, one end of which passes through the stepped hole of the base (3) and contacts the die (4), and the other end is connected to the hydraulic press.

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