Machining method and machining tool for outer circle of small silicon carbide nozzle

Abstract

The invention discloses a small silicon carbide nozzle outer circle machining method and tool. The machining method comprises the steps that a plurality of silicon carbide nozzles are connected in series one by one to form a series connection body, and the adjacent silicon carbide nozzles make close contact; fixing the two ends of the tandem body by using a fixing piece; and the tandem body is placed in a grinding tool to be machined. The machining tool comprises a series connection piece, and the series connection piece is used for connecting a plurality of silicon carbide nozzles into a whole in series so as to form a series connection body to be polished. The fixing pieces are arranged at the two ends of the series connection piece in a sleeving mode, and the fixing pieces are used for fixing the series connection body. The contact area of the outer circle of the silicon carbide nozzle and the grinding tool can be increased, an existing centerless grinding machine tool can be used for grinding the outer circle of the silicon carbide nozzle, the machining efficiency is improved, meanwhile, a higher-precision centerless grinding machine tool needs to be replaced, and the input of hardware cost and maintenance cost is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of parts processing, and in particular to a method and a processing tool for the outer circle of a small silicon carbide nozzle. Background Art

[0002] Silicon carbide nozzle is a high-performance industrial nozzle, which is widely used in a variety of harsh working environments. In the process of manufacturing silicon carbide nozzle, the outer circle accuracy of silicon carbide nozzle is very high, which needs to be ensured by fine processing. For processing such products, centerless grinding, cylindrical grinding and CNC processing technologies are generally used. However, for smaller silicon carbide nozzles, due to their small size and conical surface, the existing centerless grinding cannot effectively grind their outer circle. During the grinding process, the silicon carbide nozzle is prone to rolling and crushing.

[0003] Currently, for grinding smaller-sized silicon carbide nozzles, higher-precision grinding machines are used, but this requires higher hardware and maintenance costs, and there is still a risk of silicon carbide nozzles tumbling and crushing. Summary of the invention

[0004] The purpose of the present invention is to solve the above problems and provide a method and tooling for machining the outer circle of a small silicon carbide nozzle.

[0005] In order to achieve the above-mentioned purpose, the present invention specifically adopts the following technical solutions:

[0006] A method for machining the outer circle of a small silicon carbide nozzle, comprising:

[0007] S1, connecting a plurality of silicon carbide nozzles in series one by one to form a series body, and making adjacent silicon carbide nozzles in close contact;

[0008] S2, fixing the two ends of the series body by using a fixing member;

[0009] S3, placing the series body into a mold for processing.

[0010] As a further description of the above technical solution, in step S1, the series body is a structure arranged in a regular shape.

[0011] As a further description of the above technical solution, in step S1, the adjacent silicon carbide nozzles are connected end to end, and there is a gap between the outer circumferences of the adjacent silicon carbide nozzles in the axial direction.

[0012] As a further description of the above technical solution, in step S2, the fixing member is a rubber ring. When the rubber ring is in use, two of the rubber rings are respectively inserted into two ends of the series body.

[0013] As a further description of the above technical solution, in step S3, the grinding tool grinds the outer circumference of each of the silicon carbide nozzles in the series.

[0014] As a further description of the above technical solution, in step S3, the grinding size of the outer circumference is 0.3±0.05 mm.

[0015] As a further description of the above technical solution, in step S1, a plurality of the silicon carbide nozzles are connected in series into one by using a tungsten steel needle, and the tungsten steel needle is transitionally matched with the silicon carbide nozzle.

[0016] As a further description of the above technical solution, the outer diameter of the tungsten steel needle is 0.398mm-0.402mm.

[0017] A processing tool for using any of the above-mentioned methods for processing the outer circle of a small silicon carbide nozzle, comprising:

[0018] A series connection member, the series connection member is used to connect a plurality of silicon carbide nozzles in series to form a series body to be polished;

[0019] A fixing member is sleeved on both ends of the series connection member, and is used to fix the series connection member.

[0020] As a further description of the above technical solution, the series connection member and the fixing member are interference fit, so that the fixing member fixes the two ends of the series connection member.

[0021] The beneficial effects of the present invention are as follows:

[0022] 1. After multiple silicon carbide nozzles are connected in series in the present invention, the outer circumferential area of ​​the series body is larger than the outer circumferential area of ​​a single silicon carbide nozzle, which can increase the contact area between the silicon carbide nozzle and the grinding tool. The existing centerless grinding machine can be used to grind the outer circumference of the silicon carbide nozzle, which improves the processing efficiency while also requiring the replacement of a higher precision centerless grinding machine, reducing the investment in hardware cost and maintenance cost.

[0023] In order to more clearly illustrate the structural features and functions of the present invention, the present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a flow chart of the processing method of the present invention;

[0025] Figure 2 It is an exploded view of the cooperation between the processing tooling of the present invention and the silicon carbide nozzle;

[0026] Figure 3 This is a front view of the processing tooling of the present invention in cooperation with the silicon carbide nozzle;

[0027] Figure 4 It is a cross-sectional view of the cooperation between the processing tool of the present invention and the silicon carbide nozzle;

[0028] Figure 5 is a schematic diagram of the silicon carbide nozzle of the present invention before polishing;

[0029] Figure 6 It is a schematic diagram of the silicon carbide nozzle after polishing of the present invention.

[0030] Figure numerals: 1, silicon carbide nozzle; 2, serial body; 3, fixing piece; 4, serial piece. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solution and advantages of the embodiments of the present invention more clear, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0032] like Figure 1 As shown, in one embodiment, a method for machining the outer circle of a small silicon carbide nozzle 1 comprises the following specific steps:

[0033] S1, connect multiple silicon carbide nozzles 1 in series one by one to form a series body 2, and make the adjacent silicon carbide nozzles 1 in close contact. The multiple silicon carbide nozzles 1 are connected end to end, and the silicon carbide nozzles 1 are closely connected to each other to form a series body 2 of regular shape. The regular shape means that the series body 2 formed by the silicon carbide nozzles 1 is a linear structure, so that the series body 2 can be effectively clamped when grinding with a grinder. At the same time, after multiple silicon carbide nozzles 1 are connected in series, the outer circle area of ​​the series body 2 is larger than the outer circle area of ​​a single silicon carbide nozzle, which can increase the contact area between the silicon carbide nozzle 1 and the grinder, and the existing centerless grinding machine can be used to grind the outer circle of the silicon carbide nozzle 1. While improving the processing efficiency, it is also necessary to replace the centerless grinding machine with a higher precision, reducing the investment in hardware cost and maintenance cost.

[0034] S2. After a plurality of silicon carbide nozzles 1 form a series body 2, the two ends of the series body 2 can be fixed by using a fixing member 3 to ensure the tightness of the connection between two adjacent silicon carbide nozzles 1 in the series body 2, so as to avoid the adjacent silicon carbide nozzles 1 being too large in gap due to loosening during the grinding process, which not only affects the grinding effect but may even cause the silicon carbide nozzles 1 to break.

[0035] S3, the fixed serial body 2 is placed in a grinding tool for processing. The grinding tool can be a centerless grinding machine to grind the outer circle of the smaller size silicon carbide nozzle 1 to obtain an outer circle size of 3.0±0.005mm. Figure 5 and Figure 6The original size of the silicon carbide nozzle 1 is 3.3±0.05mm. The grinding accuracy can be achieved to 3.0±0.005mm through the above method, that is, the removal amount can be controlled within 0.3mm. This can achieve accurate grinding of the silicon carbide nozzle 1 of smaller size.

[0036] Further, refer to Figure 5 and Figure 6 As can be seen from the figure, the structure of the silicon carbide nozzle 1 is a conical structure with a through hole inside, wherein the upper part of the conical structure is a frustum, and the lower part is a hollow ring part to be polished. The height of the hollow ring is only 0.5mm and the diameter is only 3.3mm. When polishing such a small silicon carbide nozzle 1, the centerless grinding machine in the prior art cannot meet the requirements, which will cause the silicon carbide nozzle 1 to be unstable and jump out of the polishing position, affecting the polishing effect.

[0037] Optionally, when adjacent silicon carbide nozzles 1 are connected end to end in sequence, there is a gap in the circumferential direction of the outer circumference of the adjacent silicon carbide nozzles 1, which can be referred to Figure 3 Although the gap exists, it can still ensure that the adjacent silicon carbide nozzles 1 will not shake axially. At the same time, when grinding with a centerless grinder, the gap can be used to facilitate the discharge of debris and improve the grinding efficiency.

[0038] Optionally, the fixing member 3 is a rubber ring, and two rubber rings are provided, which are fixed at the two ends of the serial body 2 respectively, so that the single silicon carbide nozzle 1 in the serial body 2 will not shake in the axial direction, that is, the fixing member 3 has a fixing function. In some other embodiments, the fixing member 3 can also be a fixing ring of other materials, which is not limited here. Optionally, the diameter of the fixing member 3 is smaller than the outer diameter of the silicon carbide nozzle 1 before and after grinding, so that the centerless grinding machine will not mistakenly grind the fixing member 3 during the grinding process, thereby affecting the fixing effect of the fixing member 3 on the serial body 2.

[0039] Optionally, a plurality of silicon carbide nozzles 1 are connected in series by using a tungsten steel needle, and the tungsten steel needle and the silicon carbide nozzle 1 are transitionally matched. Specifically, the outer diameter of the tungsten steel needle is 0.398mm-0.402mm, and the inner diameter of the silicon carbide nozzle 1 and the tungsten steel needle at the matching point is 0.398mm-0.402mm, preferably 0.4mm. After the tungsten steel needle is inserted into the silicon carbide nozzle 1, it can be tightly fixed to the silicon carbide nozzle 1. Tungsten steel has better hardness, strength, wear resistance and good heat resistance. In some other embodiments, materials such as tungsten carbide and titanium carbide can also be selected, which are not limited here.

[0040] In one embodiment, 30 silicon carbide nozzles 1 can be threaded together using a 0.4 mm tungsten steel needle and fixed with a rubber ring to increase the contact area, and then polished using a centerless grinder. After processing 100 nozzles using this method, the overall yield is statistically 95%.

[0041] refer to Figure 2-Figure 4 , a processing tooling using the above processing method, comprising:

[0042] The series connection member 4 is used to connect a plurality of silicon carbide nozzles 1 in series to form a series body 2 to be polished, wherein the series connection member 4 is a tungsten steel needle.

[0043] The fixing member 3 is sleeved at both ends of the series member 4, and the fixing member 3 is used to fix the series body 2. Optionally, the series member 4 and the fixing member 3 are interference fit, so that the fixing member 3 fixes both ends of the series body 2, so that the fixing member 3, i.e., the rubber ring, can be fixed at both ends of the series body, effectively reducing the situation where the grinding efficiency is affected by the axial movement of the adjacent silicon carbide nozzles 1 in the series body 2.

[0044] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for machining the outer circle of a small silicon carbide nozzle, characterized in that: include: S1, connecting a plurality of silicon carbide nozzles in series one by one to form a series body, and making adjacent silicon carbide nozzles in close contact; S2, fixing the two ends of the series body by using a fixing member; S3, placing the series body fixed in step S2 into a mold for processing.

2. The method for machining the outer circle of a small silicon carbide nozzle according to claim 1, characterized in that: In step S1 , the series body is a structure arranged in a regular shape.

3. The method for machining the outer circle of a small silicon carbide nozzle according to claim 1, characterized in that: In step S1 , adjacent silicon carbide nozzles are connected end to end, and there is a gap between the outer circumferences of adjacent silicon carbide nozzles in the axial direction.

4. The method for machining the outer circle of a small silicon carbide nozzle according to claim 1, characterized in that: In step S2, the fixing member is a rubber ring. When the rubber ring is in use, two rubber rings are respectively inserted into two ends of the series body.

5. The method for machining the outer circle of a small silicon carbide nozzle according to claim 3, characterized in that: In step S3, the grinding tool grinds the outer circumference of each of the silicon carbide nozzles in the series.

6. The method for machining the outer circle of a small silicon carbide nozzle according to claim 1, characterized in that: In step S3, the grinding size of the outer circumference is 0.3±0.05 mm.

7. The method for machining the outer circle of a small silicon carbide nozzle according to claim 1, characterized in that: In step S1, a plurality of silicon carbide nozzles are connected in series into one by using tungsten steel needles, and the tungsten steel needles are transitionally matched with the silicon carbide nozzles.

8. The method for machining the outer circle of a small silicon carbide nozzle according to claim 7, characterized in that: The outer diameter of the tungsten steel needle is 0.398mm-0.402mm.

9. A processing tool for the method for processing the outer circle of a small silicon carbide nozzle according to any one of claims 1 to 8, characterized in that: include: A series connection member, the series connection member is used to connect a plurality of silicon carbide nozzles in series to form a series body to be polished; A fixing member is sleeved on both ends of the series connection member, and is used to fix the series connection member.

10. The processing tool according to claim 9, characterized in that: The series connection member and the fixing member are in interference fit, so that the fixing member fixes the two ends of the series connection member.

Images