Polishing machining method for cast high-temperature alloy round rod

Abstract

The invention relates to a polishing processing method for a cast high-temperature alloy round bar, which comprises the following steps of: S1, providing a cast high-temperature mother alloy round bar blank after demoulding, and grinding and polishing the excircle surface of the round bar blank; s2, the bottom end face of the round bar blank treated in the step S1 is ground through an end face grinding device, so that a defect layer on the bottom surface is removed; and S3, a dead head part at the top of the round bar blank is cut off, and a finished round bar is obtained. According to the polishing machining method for casting the high-temperature alloy round rod, the original process of integrally cutting 5-10 mm is changed into the process of only polishing and removing 1-3 mm surface defect layers, for the large-diameter high-temperature alloy round rod, several kilograms of expensive alloy materials can be reserved for each product, the rate of finished products is remarkably increased, and economic benefits are huge.

Description

Technical Field

[0001] This invention belongs to the field of metal material processing technology, and specifically discloses a grinding method for cast high-temperature alloy round bars. Background Technology

[0002] High-temperature alloys, especially casting high-temperature master alloys, are core materials for manufacturing key hot-end components of high-end equipment such as aero engines and gas turbines. These alloys typically contain a large number of high-melting-point, highly reactive alloying elements, making them expensive. After obtaining round bar castings through vacuum melting and casting, their surfaces need to be precision machined to remove oxide scale, casting defects, and achieve specified dimensional accuracy.

[0003] Traditional processing techniques, as mentioned in the background section, generally involve the following steps: After demolding, the outer diameter of the round bar is first ground with a grinding wheel and belt. Then, the bottom is removed by 5-10 mm, followed by the removal of the riser at the top to obtain the finished product. This bottom-removal process is primarily based on the following considerations: the bottom of cast round bars often contains numerous metallurgical defects, shrinkage cavities, or compositional segregation, and the bottom surface is prone to mechanical damage or severe oxidation during demolding. However, direct removal results in a significant amount of high-quality alloy material being discarded as scrap, which is a considerable material loss cost for high-temperature master alloys with extremely high unit prices. Furthermore, the removal process itself (such as sawing) increases processing time and equipment wear.

[0004] Among the publicly available technologies, there are methods and apparatuses for grinding and polishing the outer diameter of alloy bars, as well as production line designs for cutting and grinding the gating gates of castings; however, none of these technical solutions have proposed an effective solution to the specific problem of "how to deal with bottom defects of casting bars in a more material-saving way". Therefore, developing a grinding process that can reduce the amount of bottom material removed and improve the yield has important economic value and practical significance. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a grinding method for casting high-temperature alloy round bars, which reduces the amount of material removed from the bottom and improves the yield.

[0006] The technical solution adopted in this invention is: A grinding process for cast high-temperature alloy round bars, comprising the following steps: Step S1: Provide a cast high-temperature master alloy round bar blank after demolding, and grind and polish the outer surface of the round bar blank; Step S2: Grind the bottom end face of the round bar billet processed in step S1 using an end face grinding device to remove the defect layer on the bottom surface. Step S3: Cut off the riser portion at the top of the round bar billet to obtain the finished round bar.

[0007] Preferably, in the grinding process of the cast high-temperature alloy round bar, the grinding and polishing equipment in step S1 is a grinding wheel mill or a belt mill.

[0008] Preferably, in the grinding method for the cast high-temperature alloy round bar, the end face grinding device in step S2 includes a grinding wheel mounting frame. A motor is installed on one side of the grinding wheel mounting frame, and the output end of the motor is connected to a drive wheel. A driven wheel is installed inside the other side of the grinding wheel mounting frame. A mounting plate is installed on the outer side of the grinding wheel mounting frame, and a tensioning mounting plate is installed on the inner side wall of the mounting plate. A cylinder is installed below the tensioning mounting plate, and a tensioning assembly is installed on the tensioning mounting plate. The tensioning assembly includes a tensioning wheel push rod and a tensioning wheel. One end of the tensioning wheel push rod is connected to the tensioning wheel, and the other end is connected to the cylinder. A sanding belt is fitted on the drive wheel, the driven wheel, and the tensioning wheel. The tensioning assembly is extended and retracted by the cylinder.

[0009] Preferably, in the grinding method for the cast high-temperature alloy round bar, the tensioning assembly further includes a tensioning guide sleeve, which is nested in the guide hole of the tensioning mounting plate. One end of the tensioning wheel push rod passes through the tensioning guide sleeve and connects to the tensioning wheel, while the other end of the tensioning wheel push rod is connected to the cylinder.

[0010] Preferably, in the grinding method for the cast high-temperature alloy round bar, a tension wheel adjustment assembly is further provided on the mounting plate. The tension wheel adjustment assembly includes a mounting seat and an adjustment rod disposed on the inner side of the mounting plate. The tension wheel push rod is sleeved on the mounting seat. One end of the adjustment rod is threadedly connected to one side of the mounting seat, and a handle is provided on the other end of the adjustment rod.

[0011] Preferably, in the grinding method for the cast high-temperature alloy round bar, a cylinder connector is provided at the air inlet of the cylinder, and the cylinder connector is connected to the air source through an air pipe.

[0012] Preferably, in the grinding method for the cast high-temperature alloy round bar, a tensioning cylinder is provided on the sanding belt between the driving wheel and the driven wheel, sliding components are provided on both sides of the mounting plate, and sliding plates are provided on the sliding components, with the sliding plates sliding up and down on the sliding components.

[0013] Preferably, in the grinding method for the cast high-temperature alloy round bar, the sliding component includes a slide rail and a slider, a guide rail groove is provided on the mounting plate, a slide rail is provided in the guide rail groove, a slider is provided on the slide rail, an L-shaped sliding plate is provided on the slider, and a reinforcing rib is provided on the inner side of the sliding plate.

[0014] Preferably, in the grinding method for the cast high-temperature alloy round bar, a limiting plate is provided on the outer side of the two sliding components, and a protective cover is provided on the two limiting plates.

[0015] Preferably, in the grinding process of the cast high-temperature alloy round bar, the thickness removed by grinding in step S2 is 1mm-3mm.

[0016] The present invention has the following advantages: (1) The grinding process of casting high temperature alloy round bars of the present invention changes the original process of removing 5-10mm of the whole to grinding and removing only 1-3mm of surface defect layer. For high temperature alloy round bars with large diameter, each product can retain several kilograms of expensive alloy material, significantly improving the yield and economic benefits.

[0017] (2) The grinding process of the cast high-temperature alloy round bar of the present invention has strong controllability of the end face grinding process. By selecting appropriate abrasive particle size and process parameters, the defect layer can be effectively removed, while avoiding the introduction of new stress concentration or damage. The quality of the end face obtained meets the requirements of subsequent use or testing.

[0018] (3) The grinding process of the cast high-temperature alloy round bar of the present invention is usually shorter than the sawing and separation process, and is easy to realize automated or semi-automated continuous production, thereby shortening the overall processing cycle.

[0019] (4) The grinding process of the cast high-temperature alloy round bar of the present invention reduces the consumption of saw blades and the load on sawing equipment, thereby reducing the overall processing cost. Attached Figure Description

[0020] Figure 1 This is a first-view isometric view of the end-face grinding device of the present invention.

[0021] Figure 2 This is a second-view isometric view of the end-face grinding device of the present invention.

[0022] Figure 3 This is a third-view isometric view of the end-face grinding device of the present invention.

[0023] Figure 4 This is a fourth-angle isometric view of the end-face grinding device of the present invention.

[0024] Figure 5 This is a front view of the end face grinding device of the present invention.

[0025] Figure 6 This is a schematic diagram of the structure of the end face grinding device of the present invention with a protective cover.

[0026] Figure 7 This is a schematic diagram of the end face grinding device of the present invention with a sanding belt. Detailed Implementation

[0027] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Unless otherwise stated, the terminology used herein should be understood in accordance with the conventional usage of those skilled in the art.

[0028] Example like Figures 1-7 A grinding method for a Φ50mm round bar of cast nickel-based high-temperature master alloy, comprising the following steps: Step S1: Using a Φ51.7mm (with allowance) nickel-based high-temperature alloy round bar casting that has been vacuum induction melted and cast and has been demolded as a blank, the outer surface of the round bar blank is ground and polished by grinding wheel; the blank is clamped on a through-type belt grinder, and rough grinding is first performed using a grinding wheel to remove most of the machining allowance and grind the outer diameter to about Φ50.9mm; then fine belt grinding is used for polishing, and finally the outer diameter is precisely machined to Φ50±0.5mm; Step S2: Horizontally clamp the round bar that has completed the outer diameter machining in the fixture of the end face grinding machine, ensuring that its bottom end face faces the grinding head and is reliably fixed. Grind the bottom end face of the round bar blank through the end face grinding device to remove a thickness of 1.5mm to remove the defect layer on the bottom surface. Step S3: Cut off the riser portion at the top of the round bar billet to obtain the finished round bar.

[0029] The end face grinding device includes a grinding wheel mounting frame 1, a motor 2 is mounted on one side of the grinding wheel mounting frame 1, the output end of the motor 2 is connected to a drive wheel 3, a driven wheel 4 is mounted on the other side of the grinding wheel mounting frame 1, a mounting plate is mounted on the outer side of the grinding wheel mounting frame 1, a tensioning mounting plate 5 is mounted on the inner side wall of the mounting plate, a cylinder 6 is mounted below the tensioning mounting plate 5, and a tensioning assembly is mounted on the tensioning mounting plate 5. The tensioning assembly includes a tensioning wheel push rod 7 and a tensioning wheel 8. One end of the tensioning wheel push rod 7 is connected to the tensioning wheel 8, and the other end is connected to the cylinder 6. A sanding belt 21 is fitted on the drive wheel 3, the driven wheel 4, and the tensioning wheel 8. The tensioning assembly is extended and retracted by the cylinder 6.

[0030] The tensioning assembly also includes a tensioning guide sleeve 9, which is nested in the guide hole of the tensioning mounting plate 5. One end of the tensioning wheel push rod 7 passes through the tensioning guide sleeve 9 and connects to the tensioning wheel 8, while the other end of the tensioning wheel push rod 7 is connected to the cylinder 6. The mounting plate is also provided with a tensioning wheel adjustment assembly, which includes a mounting base 10 and an adjustment rod 11 located on the inner side of the mounting plate. The tensioning wheel push rod 7 is sleeved on the mounting base 10, and one end of the adjustment rod 11 is threaded to one side of the mounting base 10. The other end of the adjustment rod 11 is provided with a handle 12. The air inlet of the cylinder 6 is provided with a cylinder connector 13, which is connected to an air source through an air pipe. A tensioning cylinder 14 is provided on the sanding belt between the driving wheel 3 and the driven wheel 4. Sliding assemblies are provided on both sides of the mounting plate, and sliding plates 15 are provided on the sliding assemblies. The sliding plates 15 slide up and down on the sliding assemblies.

[0031] The sliding assembly includes a slide rail 16 and a slider 17. A guide rail groove is provided on the mounting plate, and the slide rail 16 is provided in the guide rail groove. The slider 17 is provided on the slide rail 16, and an L-shaped sliding plate 15 is provided on the slider 16. A reinforcing rib 18 is provided on the inner side of the sliding plate 15. A limiting plate 19 is provided on the outer side of the two sliding assemblies, and a protective cover 20 is provided on the two limiting plates 19.

[0032] Working process of the end face grinding device of the present invention: 1. Clamping tool: Horizontally clamp the round bar blank that has been ground by the grinding wheel and belt into the fixture of the grinding machine, ensuring that the bottom end face faces the grinding machine; 2. Start the equipment, connect the power and air supply, and the motor 2 will start to move, driving the drive wheel 3 to rotate. The drive wheel 3 drives the driven wheel 4 to rotate synchronously through the sanding belt. 3. Sanding belt tension adjustment: Cylinder 6 is connected to compressed air through cylinder connector 13, which pushes tension wheel push rod 7 to move forward. Tension wheel push rod 7 pushes tension wheel 8 to move outward, so that sanding belt 21 maintains appropriate tension between driving wheel 3, driven wheel 4 and tension wheel 8. Tensioning guide sleeve 9 ensures smooth push rod movement and avoids swaying. If fine adjustment of tension is required, the position of mounting base 10 can be adjusted by rotating handle 12 to drive adjustment rod 11. 4. Grinding execution: The sanding belt 21 rotates at high speed under the drive of the motor, and the end face of the round bar is pressed against the sanding belt 21 to grind the end face of the round bar. The tensioning cylinder 14 further ensures that the sanding belt remains stable during the grinding process. The sliding plate 15 moves up and down along the slide rail 16 and the slider 17, driving the grinding head to adapt to the workpiece with an uneven bottom. The reinforcing rib 18 enhances the structural strength of the sliding plate. 5. Safety protection: Limit plate 19 and protective cover 20 protect operators from flying debris and broken sand belts.

[0033] 6. Grinding complete: The equipment stops after grinding to the set thickness.

[0034] Finally, it should be noted that the above specific embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to examples, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A method of finish machining a cast high temperature alloy round bar, characterized by, The method comprises the following steps: Step S1, providing a demolded cast high-temperature master alloy round bar blank, and grinding and polishing the outer cylindrical surface of the round bar blank; Step S2, polishing the bottom end face of the round bar blank treated in step S1 by an end face polishing device to remove the defect layer on the bottom surface; Step S3, cutting off the riser part at the top of the round bar blank to obtain a finished round bar.

2. The finish machining method of a cast high-temperature alloy round bar according to Claim 1, wherein The grinding and polishing device in step S1 is a grinding wheel or a grinding belt.

3. The finish machining method of a cast high-temperature alloy round bar according to Claim 1, wherein The end face polishing device in step S2 comprises a grinding wheel mounting frame (1), one side of the grinding wheel mounting frame (1) is provided with a motor (2), the output end of the motor (2) is connected with a driving wheel (3), the other side of the grinding wheel mounting frame (1) is provided with a driven wheel (4), the outer side of the grinding wheel mounting frame (1) is provided with a mounting plate, the inner side wall of the mounting plate is provided with a tensioning mounting plate (5), the lower side of the tensioning mounting plate (5) is provided with a pneumatic cylinder (6), the tensioning mounting plate (5) is provided with a tensioning assembly, the tensioning assembly comprises a tensioning wheel push rod (7) and a tensioning wheel (8), one end of the tensioning wheel push rod (7) is connected with the tensioning wheel (8), the other end of the tensioning wheel push rod (7) is connected with the pneumatic cylinder (6), the driving wheel (3), the driven wheel (4) and the tensioning wheel (8) are sleeved with a grinding belt (21), and the tensioning assembly is driven to stretch and retract by the pneumatic cylinder (6).

4. The finish machining method of a cast high-temperature alloy round bar according to Claim 3, wherein The tensioning assembly further comprises a tensioning guide sleeve (9), the tensioning guide sleeve (9) is nested in the guide hole of the tensioning mounting plate (5), one end of the tensioning wheel push rod (7) passes through the tensioning guide sleeve (9) and is connected with the tensioning wheel (8), and the other end of the tensioning wheel push rod (7) is connected with the pneumatic cylinder (6).

5. The finish machining method of a cast high-temperature alloy round bar according to Claim 3, wherein The mounting plate is further provided with a tensioning wheel adjusting assembly, the tensioning wheel adjusting assembly comprises a mounting seat (10) provided on the inner side of the mounting plate and an adjusting rod (11), the tensioning wheel push rod (7) is sleeved on the mounting seat (10), one side of the mounting seat (10) is threadedly connected with one end of the adjusting rod (11), and the other end of the adjusting rod (11) is provided with a handle (12).

6. The finish machining method of a cast high-temperature alloy round bar according to Claim 3, wherein The air inlet of the pneumatic cylinder (6) is provided with a pneumatic cylinder joint (13), the pneumatic cylinder joint (13) is connected with a gas source through a gas pipe.

7. The finish machining method of a cast high-temperature alloy round bar according to Claim 3, wherein A tensioning pneumatic cylinder (14) is arranged on the grinding belt between the driving wheel (3) and the driven wheel (4), sliding assemblies are arranged on the two sides of the mounting plate, sliding plates (15) are arranged on the sliding assemblies, and the sliding plates (15) slide up and down on the sliding assemblies.

8. The finish machining method of a cast high-temperature alloy round bar according to Claim 7, wherein The sliding assembly comprises a sliding rail (16) and a sliding block (17), a guide rail groove is arranged on the mounting plate, the sliding rail (16) is arranged in the guide rail groove, the sliding block (17) is arranged on the sliding rail (16), an L-shaped sliding plate (15) is arranged on the sliding block (16), and a reinforcing rib (18) is arranged on the inner side of the sliding plate (15).

9. The finish machining method of a cast high temperature alloy round bar according to claim 7, wherein Limiting plates (19) are arranged on the outer sides of the two sliding assemblies, and protective covers (20) are arranged on the two limiting plates (19).

10. The finish machining method of a cast high temperature alloy round bar according to claim 1, wherein The polishing removal thickness in step S2 is 1mm-3mm.

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