A single crystal furnace water-cooled hot screen inner cylinder integrated spinning machining process

Abstract

The application discloses a single-crystal furnace water-cooled heat shield inner cylinder integrated spinning machining process, first, a conical frustum die and a cylindrical die are clamped and locked on a main shaft, then a circular plate blank with holes is clamped between a left combined die and a right pressing top die, then a spinning equipment is started, a circular plate blank is uniformly heated by using a spray gun, and the circular plate blank is extruded and folded layer by layer, the circular plate blank is tightly attached to the surface of the combined die, taper machining is completed, then the cylindrical die is removed, the pressing top die is replaced by a bending die, the main shaft rotates, the original folded burrs between the cylindrical die and the pressing top die are removed by a turning tool, the circular plate blank is heated, the right end of the blank is extruded by using the bending die, the end surface of the circular plate blank is bent along the bending die, and the machining is completed, and the product is cooled, the water-cooled heat shield inner cylinder formed by spinning greatly improves production efficiency and reduces production cost.

Description

Technical Field

[0001] This invention relates to the field of water-cooled heat shield technology, specifically to an integrated spinning process for the inner cylinder of a single-crystal furnace water-cooled heat shield. Background Technology

[0002] For water-cooled heat shield components, there is a gap between the inner and outer cylinders for water circulation, through which water channels are arranged in ascending layers. The inner and outer cylinders are manufactured and processed separately and are not connected at the bottom. They need to be connected and sealed. The current mainstream bottom sealing solution is to make a connecting disc flange. This connecting flange is a rotating body with internal and external interfaces. The flange is generally machined by turning or milling. After the flange is manufactured, the inner and outer cylinders are welded to the corresponding positions of the flange. This production process is complicated, wastes a lot of raw materials, and has low production efficiency. Therefore, this invention provides an integrated spinning process for the inner cylinder of a single crystal furnace water-cooled heat shield, which integrates the inner cylinder and flange into one piece to improve the production rate of the water-cooled heat shield and reduce the production cost. Summary of the Invention

[0003] The purpose of this invention is to provide an integrated spinning process for the inner cylinder of a water-cooled heat shield for a single crystal furnace. Compared with the existing rolled and welded inner cylinder, the integrated spinning process significantly improves production efficiency, reduces production costs, eliminates the need for rolling and welding processes, eliminates the need to monitor weld quality, and eliminates the need to process connecting flanges, thus avoiding material waste.

[0004] This invention provides the following technical solution: an integrated spinning process for the inner cylinder of a water-cooled heat shield in a single crystal furnace, comprising a combined mold, a pressing mold, and a bending mold. The combined mold includes a frustum-shaped mold and a cylindrical mold, with the cylindrical mold connected to the end of the frustum-shaped mold. The process includes the following steps: Step 1: Lock the cylindrical mold onto the frustum mold to form a combined mold, and then clamp the combined mold onto the spindle; Step 2: Clamp the perforated round plate blank between the left-side combination mold and the right-side pressing mold; Step 3: Start the spinning equipment and use the spray gun to heat the round plate blank to 500°C. At the same time, the round plate blank is extruded and folded layer by layer along the direction of the combined mold, so that the blank is tightly attached to the surface of the combined mold to complete the taper processing. Step 4: Stop the machine, remove the cylindrical mold, and replace the pressing mold with a bending mold; Step 5: Rotate the spindle and use a cutting tool to remove the burrs between the original cylindrical mold and the top mold; Step Six: Heat the conical round plate blank to 500℃, and use a bending die to press the right end of the conical round plate blank, so that the end face of the conical round plate blank is bent and formed along the bending die. After processing, wait for the product to cool. The single crystal furnace water-cooled heat shield includes an outer cylinder, an inner cylinder and a flange. The inner cylinder of the single crystal furnace water-cooled heat shield is integrally formed by spinning.

[0005] In order to improve the strength and molding accuracy of the blank, reduce its springback, release its internal stress, and avoid wrinkling and tearing, in step three, the spindle rotates at 200 rpm. At this time, a flame torch is used to uniformly heat the round blank to 500 degrees Celsius. After that, the spindle speed is increased to 500 rpm, and the rollers are brought close to the blank.

[0006] In step three, the blank is extruded layer by layer according to the angle of the round plate blank. The blank will deform under the application of the roller force. First, the outer edge of the blank is folded over and then extruded layer by layer inward. The operation is repeated until the entire surface is close to the surface of the combined mold. Then, the entire surface is extruded from right to left to complete the tapering process of the product.

[0007] In order to reduce the springback of extrusion molding and improve dimensional accuracy, in step six, the bending die extrudes the end face of the conical round plate blank multiple times, gradually reducing the springback of the product and reducing the dimensional error of the product after cooling.

[0008] The bending die structure is as follows: the bending die includes a pressure table, a boss is formed on the pressure table, a forming rounded corner is formed on the bottom circumference of the boss, and a chamfer is formed on the edge circumference of the pressure table. The chamfer is tangent to the forming rounded corner, and the chamfer and the forming rounded corner constitute the forming area of ​​the spinning flange.

[0009] Compared with the prior art, the beneficial effects achieved by the present invention are: (1) The inner cylinder of the water-cooled heat shield formed by spinning has significantly improved production efficiency and reduced production costs compared with the existing inner cylinder formed by rolling and welding. It eliminates the need for rolling and welding, eliminates the need to monitor the weld quality, and eliminates the need to process connecting flanges, thus saving material consumption. (2) By connecting the cylindrical mold to the side of the cone mold, the end of the semi-finished product is formed into a straight cylindrical shell. The straight cylindrical shell is processed by a lathe tool, the length of the straight cylindrical shell is controlled, and the distance between the forming fold and the cone is adjusted, so that inner cylinders of different length specifications can be produced. (3) The round plate blank is heated evenly during spinning to improve the plasticity of the round plate blank and avoid metal wrinkling and tearing during spinning. At the same time, heating can also perform hot working on the metal and improve the strength of the round plate blank after forming. Attached Figure Description

[0010] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the inner cylinder structure of the water-cooled heat shield of the present invention; Figure 2 This is a schematic diagram of the clamping structure of the circular plate blank of the present invention; Figure 3 This is a schematic diagram of the tapered forming of the circular plate blank of the present invention; Figure 4 This is a schematic diagram of the removal of burrs from the round plate blank of the present invention; Figure 5 This is a diagram showing the end extrusion molding of the conical cylindrical plate blank of the present invention; Figure 6 This is a structural diagram of the bending die of the present invention; Figure 7 This is a shape diagram of the circular plate blank of the present invention; In the diagram: 1. Round plate blank; 2. Combination mold; 21. Conical mold; 22. Cylindrical mold; 3. Pressing mold; 4. Bending mold; 5. Lathe tool; 6. Roller. Detailed Implementation

[0011] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Example

[0012] Please see Figures 1 to 5 The present invention provides a technical solution: an integrated spinning process for the inner cylinder of a water-cooled heat shield for a single crystal furnace, comprising a combined mold 2, a pressing mold 3, and a bending mold 4. The combined mold 2 includes a frustum-shaped mold 21 and a cylindrical mold 22, with the cylindrical mold 22 connected to the end of the frustum-shaped mold 21. The process includes the following steps: Step 1: Secure the frustum mold 21 and the cylindrical mold 22 with bolts to form the combined mold 2 and clamp it onto the main shaft; like Figure 2 and 7As shown, step two: clamp the perforated circular plate blank 1 between the left combination mold 2 and the right pressing mold 3. The diameter of the hole on the circular plate blank 1 is smaller than the diameter of the pressing mold 3, so that the circular plate blank 1 can be clamped and fixed between the combination mold 2 and the pressing mold 3. The hole of the circular plate blank 1 is opened at the center position. The diameter of the circular blank is selected differently depending on the product. For similar parts of water-cooled hot screen, it can be selected based on the diameter being 200mm larger than the total height of the finished water-cooled hot screen. like Figure 3 As shown, step three: Start the spinning equipment and use the spray gun to uniformly heat the round plate blank 1 to 500℃. At the same time, the round plate blank 1 is extruded and folded layer by layer along the direction of the combined mold 2, so that the round plate blank 1 is tightly attached to the surface of the combined mold 2. Pressure is applied to the round plate blank 1 to deform it, and the round plate blank 1 is extruded layer by layer inward and tightly attached to the combined mold 2 to complete the taper processing. At the same time, under the action of high temperature, the round plate blank 1 is tightly attached to the combined mold 2 to complete the taper processing. At this time, the product is in a semi-finished product state and can be mass-produced on the assembly line to improve production efficiency. Step 4: Stop the machine, remove the cylindrical mold 22, replace the pressing mold 3 with the bending mold 4, and put the semi-finished product with the completed taper processing back onto the frustum mold 21 in the original manner; like Figure 4 As shown, in step five: the spindle rotates and the lathe tool 5 removes the folded burrs between the original cylindrical mold 22 and the pressing mold 3, and forms a straight cylindrical shell on the cylindrical mold 22. The lathe tool can control the length of the straight cylindrical shell, thereby adjusting the distance between the folded edge formed by the bending mold 4 and the frustum mold 21, which is convenient for forming parts of different lengths. like Figure 5 As shown, step six: heat the conical round plate blank 1 to 500℃ to soften the round plate blank 1, improve the forming efficiency and accuracy, and use the bending die 4 to extrude the right end of the conical round plate blank 1, so that the end face of the conical round plate blank 1 is bent along the bending die 4 to form the shape. After processing is completed, wait for the product to cool. The single crystal furnace water-cooled heat screen includes an outer cylinder, an inner cylinder and a flange. The integrated spinning process of the inner cylinder of the single crystal furnace water-cooled heat screen integrates the inner cylinder and the flange into one piece.

[0013] In step three, the spindle rotates at 200 rpm. At this time, a flame torch is used to heat the round plate blank 1 evenly. After reaching 500°C, the spindle speed is increased to 500 rpm, and the roller 6 is brought close to the round plate blank 1. The high temperature increases the plasticity of the round plate blank 1, so that the round plate blank 1 fits tightly with the cone mold 21.

[0014] In step three, the round plate blank 1 is extruded layer by layer according to the angle of the combined mold 2. The round plate blank 1 will deform under the force of the roller 6. First, the outer edge of the round plate blank 1 is folded over and extruded inward layer by layer. The operation is repeated until the entire surface is close to the surface of the combined mold 2. Then, the whole surface is extruded from right to left to make the outer surface smooth and complete the tapered processing of the product.

[0015] like Figure 6 As shown, in step six, the conical cylindrical round plate blank 1 is bent along the corner of the bending die 4. The bending die 4 includes a pressure table 41, on which a boss 42 is formed. The boss 42 is formed by an annular groove on the circumference of the pressure table 41. A forming rounded corner 43 is formed on the bottom circumference of the boss 42. A chamfer 44 is formed on the edge circumference of the pressure table 41. The chamfer 44 is tangent to the forming rounded corner 43. The chamfer 44 and the forming rounded corner 43 constitute the forming area of ​​the spinning flange. The end of the blank 1 is squeezed by the chamfer 44 and the forming fillet 43, causing the end to bend into a flange shape. After processing, the bending die 4 retracts, and the end of the round blank 1 will spring back. The bending die 4 then squeezes the end face of the round blank 1 multiple times to gradually reduce the springback of the product, reduce the dimensional error of the product after cooling, and control the wall thickness of the product within ±0.5mm of the design size. The length dimension is controlled by turning. It replaces the original inner cylinder and flange.

[0016] Existing water-cooled heat shield components involve welding the inner cylinder to a connecting flange, which is machined on a lathe. This results in low raw material utilization. The inner cylinder is formed by rolling and welding sheet metal into a fan shape. The fan-shaped angle and radius need to be mathematically calculated in advance. After cutting, the fan-shaped material is fixed on a hydraulic device for rolling. After strong rolling, the welder welds the joint. The welded joint also needs to be inspected by X-ray. At the same time, the strength of the weld and the deformation of the material must be considered. The inner cylinder is then heat-treated. This production process has low raw material utilization, high production cost, low efficiency, and generally poor overall economic performance.

[0017] In this technical solution, the inner cylinder and flange are integrally hot-spinned and formed, allowing both to be manufactured simultaneously. Circular plates of the same specifications are procured in batches and formed using hot spinning. This process applies significant pressure to the plates. A specially designed combination mold and a single-sided bending mold are used in conjunction. When the main shaft of the equipment drives the circular plate blank to rotate at high speed, the product is appropriately heated. Rollers on the frame then approach and press the surface of the circular plate blank, shaping it along one side of the combination mold. This presses the circular plate blank into a cone shape. After completion, the other side of the cone is pressed to create a rolled edge, achieving the desired shape. Finally, some edges are processed and trimmed. The integrated water-cooled heat shield inner cylinder is then completed and can directly replace the original parts.

[0018] Only one mold needs to be made initially to produce finished products for a long time. When purchasing in large quantities, the regular shape of the perforated round plate raw material can be easily customized in batches, saving the waste of scrap material after cutting the blank into a fan shape in the original plan. Thanks to one-time molding, the process is fast. In the past, a single process in the workshop required 5-8 hours. With this process, it can be quickly compressed to within 2-3 hours. The process control points in the whole process are simplified. Under the condition of precise mold size, the product can be directly processed, reducing manpower and material resources and effectively reducing product costs. At the same time, there is deformation strengthening during hot spinning, which improves the strength.

[0019] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A spinning process for an integrated inner cylinder of a water-cooled heat shield for a single-crystal furnace, comprising a combined mold, a pressing mold, and a bending mold, wherein the combined mold includes a frustum-shaped mold and a cylindrical mold, the cylindrical mold being connected to the end of the frustum-shaped mold, characterized in that: Includes the following steps: Step 1: Lock the cylindrical mold onto the frustum mold to form a combined mold, and then clamp the combined mold onto the spindle; Step 2: Clamp the perforated round plate blank between the left-side combination mold and the right-side pressing mold; Step 3: Start the spinning equipment and use the spray gun to heat the round plate blank to 500°C. At the same time, the round plate blank is extruded and folded layer by layer along the direction of the combined mold, so that the round plate blank is tightly attached to the surface of the combined mold to complete the taper processing. Step 4: Stop the machine, remove the cylindrical mold, and replace the pressing mold with a bending mold; Step 5: Rotate the spindle and use a cutting tool to remove the burrs between the original cylindrical mold and the top mold; Step Six: Heat the conical round plate blank to 500℃, and use a bending die to press the right end of the conical round plate blank, so that the end face of the conical round plate blank is bent and formed along the bending die. After processing, wait for the product to cool. The single crystal furnace water-cooled heat shield includes an outer cylinder, an inner cylinder and a flange. The inner cylinder of the single crystal furnace water-cooled heat shield is integrally formed by spinning.

2. The integral spinning process for the inner cylinder of a water-cooled heat shield for a single crystal furnace according to claim 1, characterized in that: In step three, the spindle rotates at 200 rpm. At this time, a flame torch is used to heat the round plate blank evenly. After reaching 500 degrees Celsius, the spindle speed is increased to 500 rpm, and the rollers are brought close to the round plate blank.

3. The integral spinning process for the inner cylinder of a water-cooled heat shield for a single crystal furnace according to claim 1, characterized in that: In step three, the round plate blank is extruded layer by layer along the direction of the combined mold according to the angle of the round plate blank. The round plate blank will deform under the application of the roller force. First, the outer edge of the round plate blank is folded over and then extruded layer by layer inward. The operation is repeated until the entire surface is close to the surface of the combined mold. Then, the whole thing is extruded from right to left to complete the tapering process of the product.

4. The integral spinning process for the inner cylinder of a water-cooled heat shield for a single crystal furnace according to claim 1, characterized in that: In step six, the bending die repeatedly presses the end face of the conical cylindrical blank to gradually reduce the springback of the product and reduce the dimensional error of the product after cooling.

5. The integral spinning process for the inner cylinder of a water-cooled heat shield for a single crystal furnace according to claim 1, characterized in that: The bending die includes a pressure table, on which a boss is formed. A forming rounded corner is formed on the bottom circumference of the boss. A chamfer is formed on the edge circumference of the pressure table. The chamfer is tangent to the forming rounded corner. The chamfer and the forming rounded corner constitute the forming area of ​​the spun flange.

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