Molybdenum bushing forming die for sintering quartz glass tube

Abstract

Provided is a molybdenum lining pipe forming die for quartz glass tube sintering, belonging to the technical field of pipe forming. The molybdenum lining pipe forming die comprises a lower die block, an upper die block and a core rod. The lower die block is provided with a lower semicircular forming concave surface, and the upper die block is provided with an upper semicircular forming concave surface, so that a full circle cavity is formed after the die blocks are closed. A V-shaped automatic centering structure is arranged between the lower die block and the upper die block to ensure the die closing precision. The core rod is used to provide support in the press bending process when the molybdenum plate is reshaped into a molybdenum tube. The molybdenum plate is gradually bent and formed by a press machine, and the molybdenum lining pipe forming die has the advantages of high processing efficiency, good forming quality, high yield and the like, and is suitable for batch production of the molybdenum lining pipe for quartz glass tube sintering.

Description

Technical Field

[0001] This utility model belongs to the field of pipe forming technology, specifically relating to a molybdenum liner forming mold for sintering quartz glass tubes. Background Technology

[0002] In the sintering process of quartz glass tubes, a high-temperature resistant molybdenum liner is typically installed inside to prevent deformation at high temperatures. Molybdenum has an extremely high melting point (approximately 2620℃), enabling it to maintain structural stability at high temperatures and ensuring the quartz glass tube remains straight after sintering. Traditional methods for processing molybdenum liners primarily rely on manual bending using a hammer and mandrel. This method has the following drawbacks: 1. Low processing efficiency, reliant on manual operation, and high labor intensity; 2. The molding quality is unstable and prone to defects such as cracks and deformation. Once cracks appear, the workpiece will be scrapped, and the molybdenum material cannot be recycled and reused. 3. The inability to guarantee consistent roundness affects the sintering quality of the quartz glass tubes.

[0003] Therefore, there is an urgent need for a molybdenum liner forming mold that can improve processing efficiency, ensure forming quality, and is suitable for mass production. Utility Model Content

[0004] The technical problem solved by this utility model is to provide a molybdenum liner forming mold for sintering quartz glass tubes, so as to solve the problems of low processing efficiency, unstable quality and low yield of molybdenum liner tubes in the prior art.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A molybdenum liner forming mold for sintering quartz glass tubes includes a lower module, an upper module, and a mandrel. The upper surface of the lower module is provided with a lower semi-circular forming concave surface, and the lower surface of the upper module is provided with an upper semi-circular forming concave surface. The lower semi-circular forming concave surface and the upper semi-circular forming concave surface are closed to form a complete circle. The mandrel is used to provide support during the bending process when the molybdenum plate is reshaped into a molybdenum tube.

[0006] Further defining the above scheme, a V-shaped automatic centering structure is provided on the opposite surfaces of the lower module and the upper module. The V-shaped automatic centering structure includes a V-shaped boss on the upper surface of the lower module and a V-shaped groove on the lower surface of the upper module. The lower semi-circular forming concave surface is located at the top of the V-shaped boss, and the upper semi-circular forming concave surface is located at the bottom of the V-shaped groove.

[0007] Further defining the above scheme, the inclined plane angle α of the V-shaped automatic centering structure is 45° to 60°.

[0008] Further defining the above solution, the lower part of the lower module is integrally formed with a lower mold support base for supporting the lower module on the lower mold base of the press; the upper part of the upper module is integrally formed with an upper mold fixing base for fixing the upper module to the upper mold base of the press.

[0009] As a further limitation of the above scheme, the diameters of the lower semicircular forming concave surface and the upper semicircular forming concave surface are matched with the outer diameter of the molybdenum liner tube to be formed.

[0010] As a further limitation of the above scheme, the diameter of the mandrel is equal to the outer diameter of the molybdenum liner tube minus twice its wall thickness.

[0011] Further defining the above scheme, the mold is driven by a press to perform mold closing and opening actions between the upper and lower modules, thereby realizing the multiple progressive bending forming of the molybdenum plate.

[0012] Advantages of this utility model compared to the prior art: 1. This solution achieves progressive bending forming of molybdenum plates through the cooperation of upper and lower modules and mandrel, significantly improving processing efficiency and consistency; 2. The mold closing mechanism of the upper and lower molds in this solution adopts a V-shaped automatic centering structure to ensure mold closing accuracy, prevent misalignment of the upper and lower molds, and improve the roundness of the finished product; 3. The mold structure of this solution is simple and easy to operate, making it suitable for mechanized production using presses and reducing labor costs; 4. The molybdenum plate is less prone to cracking during the molding process of this solution, resulting in a high yield and high material utilization. Attached Figure Description

[0013] Figure 1 This is a front view of the structure of this utility model in the mold-closed state; Figure 2 This is a front view of the structure of this utility model in the mold-opening state; Figure 3 This is a three-dimensional structural diagram of the present invention in the mold-opening state; Figure 4 This is a schematic diagram of the structure of the core rod in this utility model; Figure 5 This is a structural diagram of the mold of this utility model in use. Detailed Implementation

[0014] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0015] In the description of this utility model, it should be understood that the terms "upper", "lower", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0016] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0017] Please see Figure 1-5 The embodiments of this utility model are described in detail below.

[0018] like Figures 1 to 4 As shown, the molybdenum liner forming mold for sintering quartz glass tubes provided by this utility model includes a lower module 1, an upper module 2, and a mandrel 10. The upper surface of the lower module 1 is machined with a lower semi-circular forming concave surface 3, and the lower surface of the upper module 2 is machined with an upper semi-circular forming concave surface 4. When the mold is closed, the lower semi-circular forming concave surface 3 and the upper semi-circular forming concave surface 4 form a complete circular cavity. The mandrel 10 is inserted into the mold during the bending process of the molybdenum plate to provide support and prevent the molybdenum plate from collapsing or deforming.

[0019] A V-shaped automatic centering structure 5 is provided between the lower module 1 and the upper module 2. The V-shaped automatic centering structure 5 includes a V-shaped boss 6 and a V-shaped groove 7. The V-shaped boss 6 is located on the upper surface of the lower module 1, and the V-shaped groove 7 is located on the lower surface of the upper module 2. The lower semi-circular forming concave surface 3 is located at the top of the V-shaped boss 6, and the upper semi-circular forming concave surface 4 is located at the bottom of the V-shaped groove 7. During mold closing, the V-shaped structure achieves automatic centering through the inclined surface cooperation, ensuring accurate alignment of the upper and lower semi-circular forming concave surfaces and preventing misalignment.

[0020] Preferably, the inclined plane angle α of the V-shaped automatic centering structure 5 is 45° to 60° to ensure positioning accuracy and structural strength.

[0021] The lower module 1 is integrally formed at the bottom and has a lower mold support seat 8, which is used to stably support and place it on the lower mold seat of the press; the upper module 2 is integrally formed at the top and has an upper mold fixing seat 9, which is used to fix it to the upper mold seat of the press.

[0022] The diameters of the lower semicircular forming concave surface 3 and the upper semicircular forming concave surface 4 are determined according to the outer diameter of the molybdenum liner tube to be formed. The diameter of the mandrel 10 is determined according to the inner diameter of the molybdenum liner tube, and it is inserted inside to provide support during the bending process when the molybdenum plate is reshaped into a molybdenum tube.

[0023] Working principle: like Figure 5 As shown, the molybdenum plate is placed on the lower semi-circular concave surface of the lower module. The press is started, and the upper module moves downward. After automatic centering via the V-shaped structure, the mold closes, and the molybdenum plate gradually bends under the action of the upper and lower semi-circular concave surfaces. Through multiple progressive bending operations, the molybdenum plate is gradually bent from an initial flat plate into a polygon, eventually forming a circular tube. A mandrel is inserted inside the molybdenum plate during the bending process to provide support and prevent the inner wall from collapsing. After forming, the mold is opened, and the formed molybdenum liner tube is removed.

[0024] This utility model has a reasonable structure, is easy to operate, and produces high molding quality. It is suitable for the mass production of molybdenum liner tubes for quartz glass tube sintering.

[0025] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0026] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A molybdenum liner forming mold for sintering quartz glass tubes, characterized in that: The system includes a lower module (1), an upper module (2), and a mandrel (10). The upper surface of the lower module (1) is provided with a lower semi-circular forming concave surface (3), and the lower surface of the upper module (2) is provided with an upper semi-circular forming concave surface (4). The lower semi-circular forming concave surface (3) and the upper semi-circular forming concave surface (4) are molded together to form a complete circle. The mandrel (10) is used to insert into the interior of the molybdenum plate when it is reshaped into a molybdenum tube to provide support during the bending process.

2. The molybdenum liner forming mold for sintering quartz glass tubes according to claim 1, characterized in that: A V-shaped automatic centering structure (5) is provided on the opposite surfaces of the lower module (1) and the upper module (2). The V-shaped automatic centering structure (5) includes a V-shaped boss (6) on the upper surface of the lower module (1) and a V-shaped groove (7) on the lower surface of the upper module (2). The lower semi-circular forming concave surface (3) is located at the top of the V-shaped boss (6), and the upper semi-circular forming concave surface (4) is located at the bottom of the V-shaped groove (7).

3. The molybdenum liner forming mold for sintering quartz glass tubes according to claim 2, characterized in that: The inclined plane angle α of the V-shaped automatic centering structure (5) is 45° to 60°.

4. The molybdenum liner forming mold for sintering quartz glass tubes according to claim 1, characterized in that: The lower part of the lower module (1) is integrally formed with a lower mold support base (8) for supporting the lower module (1) on the lower mold base of the press; the upper part of the upper module (2) is integrally formed with an upper mold fixing base (9) for fixing the upper module (2) to the upper mold base of the press.

5. The molybdenum liner forming mold for sintering quartz glass tubes according to claim 1, characterized in that: The diameters of the lower semicircular forming concave surface (3) and the upper semicircular forming concave surface (4) are matched with the outer diameter of the molybdenum liner to be formed.

6. The molybdenum liner forming mold for sintering quartz glass tubes according to claim 1, characterized in that: The diameter of the mandrel (10) is equal to the outer diameter of the molybdenum liner minus twice its wall thickness.

7. The molybdenum liner forming mold for sintering quartz glass tubes according to claim 1, characterized in that: The mold is driven by a press to perform mold closing and opening actions of the upper module (2) and the lower module (1) to realize the multiple progressive bending forming of the molybdenum plate.

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