Die suitable for special front plate spiral pressing forming

Abstract

A mold suitable for special front plate spiral pressing forming comprises a main mold body and an auxiliary mold body, the auxiliary mold body comprises a lower mold body, a fixing block and a cover plate, the lower mold body and the fixing block are both cylindrical and both arranged on the periphery of the main mold body in a sleeving mode, the fixing block is arranged above the lower mold body and presses the lower mold body, and the cover plate covers the upper end of the main mold body. And the auxiliary die is connected with the main die through a bolt, so that the auxiliary die and the main die on the spinning platform rotate synchronously. The front disc machining device is simple in structure, low in cost, high in applicability and convenient to mount and demount, front disc efficient machining of various stainless steel thick plates is achieved, the main die is stably fixed to the spinning platform, the auxiliary die and the main die are tightly assembled into a whole, and during work, the male die controlled by a machine extrudes blanks located on the female die, so that machining efficiency is improved. Therefore, integral spinning forming of the straight section and the arc section is achieved in cooperation with a self-made spinning machine.

Description

Technical Field

[0001] This utility model relates to the field of fan front disc processing, specifically to a mold suitable for spinning special front discs. Background Technology

[0002] Centrifugal fan impellers are core components of industrial fans, air conditioning systems, and other equipment. The geometry of their front discs (such as conical, arc-shaped, or complex curved surfaces) directly affects airflow efficiency and mechanical performance. The front discs are formed through a spinning process, plastically deforming them into the desired shape. The rationality of the mold design determines the forming quality, efficiency, and cost. In the fan manufacturing field, the aerodynamic performance of a fan depends to a certain extent on the dimensional accuracy of components with conical or arc-shaped structures, such as the air inlet and the impeller front disc. Currently, most fan front discs are formed using automatic spinning machines. However, commercially available centrifugal fans face many limitations in sheet metal processing. On the one hand, most centrifugal fans have stringent requirements regarding the material and thickness range of the sheet metal being processed. For special materials and thick plates (especially those greater than 5mm), the forming effect is unsatisfactory. For example, when processing thick stainless steel plates, the spun front discs are prone to surface unevenness and large dimensional deviations, failing to meet the actual usage requirements of the fan. On the other hand, existing centrifugal fan equipment has poor mold versatility for different specifications of sheet metal, and the mold replacement process is cumbersome, which affects production efficiency and increases production costs. Utility Model Content

[0003] To overcome the above shortcomings, this utility model provides a mold suitable for special front disc spinning.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0005] A mold suitable for special front disc spinning forming includes a main mold and a secondary mold. The secondary mold includes a lower mold, a fixing block, and a cover plate. The lower mold and the fixing block are both cylindrical and are sleeved on the outer periphery of the main mold. The fixing block is positioned above the lower mold and presses it down. The cover plate covers the upper end of the main mold and presses down the fixing block and the lower mold. The secondary mold is connected to the main mold by bolts, so that the secondary mold and the main mold on the spinning platform rotate synchronously. The blank on the main mold is formed by the punch pressing it.

[0006] Further optimization involves installing a motor spindle below the spinning platform, which drives the main mold and the auxiliary mold to rotate.

[0007] Further optimization involves making the inner surface arc of the lower mold close to the outer surface arc of the main mold, thus achieving continuity in the connection between the contact end faces of the lower mold and the main mold.

[0008] Further optimization involves making the inner diameter of the fixing block equal to the inner diameter of the upper end of the lower mold, and making the outer diameter of the fixing block smaller than the outer diameter of the lower mold.

[0009] Further optimization involves providing a threaded hole at the upper end of the lower mold, which, when used with bolts, facilitates the disassembly of the lower mold.

[0010] Further optimization involves providing openings at the center of both the cover plate and the upper end of the main mold for bolt installation.

[0011] Further optimization involves pressing the blank onto the outer contours of the main mold and the auxiliary mold by the punch during the molding process, thereby forming the front plate into an arc segment and a straight segment in one step.

[0012] The beneficial effects of this utility model are as follows:

[0013] The mold of this invention is a concave mold. When in use, the position or size of the punch and the concave mold can be flexibly adjusted in conjunction with the spinning machine platform to complete the spinning work in tandem. Furthermore, relying on the shape design and installation matching of the main mold and the auxiliary mold, it can realize the integrated spinning of the straight section and the arc section of the front plate, improve production efficiency, reduce one straight section forming process, and realize the spinning forming of special materials such as stainless steel 304, 316L, 312, etc., with a maximum thickness of 12mm. The mold has a simple structure, low cost, and is easy to install and disassemble. At the same time, it is applicable to the front plate profile of various fan models. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model;

[0015] Figure 2 This is a top view of the lower mold structure.

[0016] Reference numerals: 1. Motor spindle, 2. Spinning platform, 3. Main mold, 4. Lower mold, 5. Fixing block, 6. Cover plate, 7. Bolt, 8. Punch. Detailed Implementation

[0017] In order to better understand the above-mentioned objectives, features and advantages of this utility model, the present utility model will be described in detail below with reference to specific embodiments. The following embodiments are implemented based on the technical solution of this utility model, and detailed implementation methods and specific operation processes are given. However, this utility model can also be implemented in other ways different from those described herein. Therefore, the protection scope of this utility model is not limited to the following embodiments.

[0018] A mold suitable for special front disc spinning includes a main mold 3 and a secondary mold. The secondary mold includes a lower mold 4, a fixing block 5, and a cover plate 6. The lower mold 4 and the fixing block 5 are both cylindrical and are sleeved on the outer periphery of the main mold 3. The fixing block 5 is positioned above the lower mold 4 and presses the lower mold 4. The cover plate 6 covers the upper end of the main mold 3 and presses the fixing block 5 and the lower mold 4 below. The upper center of the cover plate 6 and the main mold 3 are both provided with openings. The secondary mold and the main mold 3 are fixed together by bolts for the installation of the bolts.

[0019] Below the spinning platform 2 is a motor spindle 1. The main mold 3 has an internal circular hole. The motor spindle under the spinning platform 2 passes through the circular hole of the main mold 3. The motor spindle 1 drives the main mold 3 and the auxiliary mold to rotate synchronously through the keyway transmission. During this process, the blank is squeezed by the punch 8 onto the outer contour of the main mold 3 and the auxiliary mold, so that the front plate forms the arc segment and the straight segment in one step. That is, the lower mold 4 realizes the straight segment of the blank and the arc segment of the blank is spun based on the arc segment of the main mold 3.

[0020] The inner surface arc of the lower mold 4 is close to the outer surface arc of the main mold 3, achieving continuity in the contact end face connection between the lower mold 4 and the main mold 3. The inner diameter of the fixing block 5 is equal to the inner diameter of the upper end of the lower mold 4, and the outer diameter of the fixing block 5 is smaller than the outer diameter of the lower mold 4. The upper end of the lower mold 4 is also provided with a threaded hole for easy disassembly with bolts.

[0021] Front disc forming process: Place the annular blank on the main mold 3 (the spun arc section of the main mold) on the spinning platform 2, start the motor, and the main mold 3 rotates with the spinning platform 2. Start the actuator of the control punch 8 (controls the front and rear position of the punch to squeeze the blank). The punch 8 squeezes the blank located on the main mold 3. During the squeezing process by the punch 8, the stability of the blank during the spinning process is improved. In this process, the blank rotates synchronously with the main mold 3 to form the arc section required for the front disc. Adjust the position of the blank in the vertical direction so that it is placed on the outer surface of the lower mold 4. Repeat the above operation to form the straight section required for the front disc.

[0022] This utility model features a simple structure, low cost, strong applicability, and easy installation and disassembly, enabling efficient processing of stainless steel thick plates (greater than 5mm) for the front plate. The mold involved is a concave mold; during use, the positions or dimensions of the punch and die can be flexibly adjusted in conjunction with a spinning machine platform to collaboratively complete the spinning process. The mold consists of a main mold and a secondary mold. The main mold is firmly fixed on the spinning platform, while the secondary mold is tightly assembled with the main mold. During operation, the machine-controlled punch extrudes the blank located on the concave mold, thereby achieving integrated spinning forming of straight and curved sections in conjunction with the self-made spinning machine. This effectively overcomes the shortcomings of existing technologies and demonstrates significant advantages.

[0023] The foregoing has shown and described the main features, usage method, basic principles, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model based on actual circumstances without departing from its spirit and scope. All such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A die suitable for special front disc spinning, comprising a main die (3) and a sub-die, characterized in that, The sub-mold includes a lower mold (4), a fixing block (5), and a cover plate (6). The lower mold (4) and the fixing block (5) are both cylindrical and are fitted around the outer periphery of the main mold (3). The fixing block (5) is positioned above the lower mold (4) and presses the lower mold (4). The cover plate (6) is placed on the upper end of the main mold (3) and presses the fixing block (5) below and the lower mold (4). The sub-mold is connected to the main mold (3) by bolts (7), so that the sub-mold and the main mold (3) on the spinning platform (2) rotate synchronously. The blank on the main mold (3) is formed by pressing it with a punch (8).

2. A die for use in the special front disc spinning process as claimed in claim 1, characterized in that, The spinning platform (2) is provided with a motor spindle (1) below it. The main mold (3) and the auxiliary mold are rotated by the motor driving the motor spindle (1).

3. A die for use in spinning a special front disc as set forth in claim 1, wherein The inner surface arc of the lower mold (4) is close to the outer surface arc of the main mold (3), so as to achieve the continuity of the contact end face connection between the lower mold (4) and the main mold (3).

4. A die for use in spinning a special front disc as set forth in claim 1, wherein The inner diameter of the fixing block (5) is equal to the inner diameter of the upper end of the lower mold (4), and the outer diameter of the fixing block (5) is smaller than the outer diameter of the lower mold (4).

5. A die for use in spinning a special front disc as set forth in claim 1, wherein, The lower mold (4) has a threaded hole at its upper end, which, together with the bolt (7), facilitates the disassembly of the lower mold.

6. A die for use in spinning a special front disc as set forth in claim 1, wherein, Both the cover plate (6) and the main mold (3) have openings at their upper center for the installation of bolts (7).

7. A die for use in spinning a special front disc as set forth in claim 1, wherein During the molding process, the blank is pressed by the punch (8) onto the outer contours of the main mold (3) and the auxiliary mold, so that the front plate is formed into an arc segment and a straight segment in one step.

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