A method for machining cylindrical parts

Abstract

This application relates to the field of optical component processing technology, and provides a method for processing cylindrical parts, including: attaching the outer circular surface of a blank to a square brick on a plate, placing the square brick onto a glass plate, sealing and filling the blank with wax sequentially, sanding and polishing the blank and smoothing the first end face to a first parameter threshold, correcting the lateral sag of the blank, controlling the lateral sag to be less than a first preset lateral sag value, and lowering the plate to obtain a first part; attaching and fixing the first part to the through cavity of a mold, so that the first end face is exposed at the first port, attaching and fixing one side of the second port of the mold to the glass plate, sanding and polishing the first end face to a convex or concave surface to obtain a second part; milling the second end face of the second part into a conical shape to obtain a cylindrical part. Before processing the outer shape of the two ends of the cylindrical part, the lateral sag of the cylindrical part is corrected to ensure that the cylindrical part has high lateral sag accuracy and center deviation during subsequent processing of concave and convex surfaces and conical angles. The processing process is simple, convenient, and highly accurate.

Description

Technical Field

[0001] This application relates to the field of optical component processing technology, and more specifically, to a method for processing cylindrical components. Background Technology

[0002] Cylindrical optical components are special optical elements that are cylindrical along their length, with one or both surfaces having spherical curvature. These components are primarily used to control the propagation characteristics of a light beam in one direction, while maintaining or being affected differently in the other. Cylindrical optical components are divided into convex cylindrical components and concave cylindrical components, used for converging and diverging light rays, respectively.

[0003] Existing traditional cold working equipment is suitable for processing planar or spherical products of conventional shapes and sizes. With the help of conventional fixtures, traditional cold working equipment can complete the processing normally. However, for the processing of cylindrical parts, because the shape of the cylindrical part is like a long lens with strict polishing requirements, traditional processing methods are difficult to meet the requirements, the surface error is difficult to meet the requirements, and the processing accuracy is low.

[0004] Therefore, existing technologies still need improvement and development. Summary of the Invention

[0005] The purpose of this application is to propose a method for processing cylindrical parts to solve the technical problem of low processing accuracy of cylindrical optical parts in the prior art.

[0006] To achieve the above objectives, the technical solution adopted in this application is: to provide a method for processing cylindrical parts, comprising:

[0007] The invention provides a blank, a square brick, a glass plate, and a mold. The blank has a first end face, a second end face, and an outer circular surface. The mold has a through cavity inside that matches the size of the blank. The through cavity forms a first port and a second port at both ends of the mold.

[0008] The outer circular surface of the blank is attached to the square brick, the square brick is placed on the glass plate, the blank is sealed with wax and filled with wax in sequence, the blank is sanded and polished and the first end face is smoothed to the first parameter threshold, the side sag of the blank is trimmed and the side sag is controlled to be less than the first side sag preset value, and the first part is obtained by lowering the plate.

[0009] The first part is bonded and fixed inside the through cavity of the mold, so that the first end face is exposed at the first port. The second port side of the mold is bonded and fixed on the glass plate. The first end face is sanded and polished to a convex or concave surface. The first part is removed from the plate and the center deviation, surface shape, and radius of curvature of the first end face are detected to reach the second parameter threshold to obtain the second part.

[0010] The second end face of the second part is milled into a cone shape, and the diameter, cone angle, and coaxiality of the cone are detected to reach the third parameter threshold to obtain a cylindrical part.

[0011] Furthermore, the side sag of the roughened blank includes:

[0012] The first end face and the second end face are initially sanded and polished to flatten the first end face and the second end face, so that the perpendicularity deviation angle between the outer circular surface and the first end face and the second end face is less than the first lateral droop preset value.

[0013] Furthermore, the sequential sealing and waxing of the blank part includes:

[0014] Clean the blanks and square bricks to remove surface impurities and contaminants;

[0015] Align the blank with the square brick;

[0016] At high temperature, square bricks are fused onto the blank to form the first sealing layer, and the blank is obtained after cooling and wax sealing.

[0017] Heat the alloy wax or resin to a molten state;

[0018] Molten material is injected around the blank and at least half the length of the blank is submerged. The material cools and solidifies to form a blank with a second sealing layer.

[0019] In some embodiments, the grinding, polishing, and smoothing of the first end face and the second end face to a first parameter threshold includes:

[0020] The first end face and the second end face are sanded using a single-axis sander.

[0021] Polish the first end face and the second end face using a polishing machine, and control the aperture to polish the adhesive.

[0022] Furthermore, before sequentially sealing and pouring wax onto the blank part, the process also includes:

[0023] A first mounting plate is bonded to the glass disk, the first mounting plate surrounds the blank, and the surface of the first mounting plate facing away from the glass disk is not lower than the first end face;

[0024] During the sandblasting and polishing of the first end face and the second end face, the first mating plate is also sandblasted and polished simultaneously.

[0025] In some embodiments, the mold is further provided with a plurality of third ports communicating with the through cavity around the first port, and the step of bonding and fixing the first part in the through cavity of the mold includes:

[0026] Asphalt is bonded to the outer circular surface around the first end face, a second mating plate is bonded to the asphalt, and asphalt is bonded to the second end face.

[0027] The second end face of the first part is inserted into the through cavity through the first port, so that the second matching plate is bonded to the third port and the first end face is bonded and exposed to the first port, and the second end face of the first part is bonded to the second port.

[0028] Furthermore, the step of bonding and fixing one side of the second port of the mold to the glass disk includes:

[0029] When the first part is bonded and fixed in the through cavity of the mold, the asphalt on the second end face is exposed at the second port.

[0030] The second port of the mold is heated, and the second port is vertically bonded to the glass plate.

[0031] In some embodiments, the step of grinding and polishing the first end face to a convex or concave surface includes:

[0032] The center deviation of the single-axis sander is controlled at a first taper threshold. The single-axis sander is used to sand the first end face and the matching disc, so that the first end face forms a convex or concave surface.

[0033] The first end face and the second mating plate are polished using a ten-axis polishing machine to ensure consistent length.

[0034] Further, the first component of the lower plate includes:

[0035] The first part is placed in a gasoline solution and removed from the plate by immersion or by heating.

[0036] In some embodiments, milling the second end face of the second part into a tapered shape includes:

[0037] Adjust the angle of the grinding wheel so that it grinds along the outer circular surface around the second end face of the second part to form the required taper milling to a cone shape.

[0038] The beneficial effects of the machining method for cylindrical parts provided in this application are at least as follows:

[0039] Before machining the two ends of a cylindrical part, the lateral sag of the cylindrical part can be corrected, ensuring that the cylindrical part has high lateral sag accuracy and center deviation when machining concave and convex surfaces and conical angles. The machining process is simple and convenient, and the machining accuracy is high, which can meet the machining index requirements.

[0040] During the process of grinding the first and second end faces into concave or convex surfaces, setting the first and second mating discs around the machined surface can reduce damage to the machined surface, reduce the risk of edge chipping, and thus improve the processing quality and accuracy. Attached Figure Description

[0041] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0042] Figure 1 A flowchart illustrating the machining method for cylindrical parts provided in this application embodiment;

[0043] Figure 2 This is a schematic diagram of the structure of the blank provided in the embodiments of this application;

[0044] Figure 3 This is a schematic diagram of the structure of a blank part being bonded to a square brick according to an embodiment of this application;

[0045] Figure 4 This is a schematic diagram of the structure of the first matching plate after the blank is mounted on the plate, as provided in the embodiments of this application;

[0046] Figure 5 This is a schematic diagram of the structure of the blank being bonded inside the mold according to an embodiment of this application;

[0047] Figure 6 This is a schematic diagram of the structure when the second mounting plate is bonded to the blank provided in the embodiment of this application;

[0048] Figure 7 A schematic diagram of the mold is provided for the embodiments of this application.

[0049] The following are the labeling elements in the figure:

[0050] 1. Raw blank; 11. First end face; 12. Second end face; 13. Outer cylindrical surface;

[0051] 2. Square bricks;

[0052] 3. Glass plate;

[0053] 4. Mold; 41. Through cavity; 42. First port; 43. Second port; 44. Third port;

[0054] 5. Asphalt;

[0055] 6. First plate arrangement;

[0056] 7. Second plate arrangement. Detailed Implementation

[0057] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0058] It should be noted that when a component is referred to as "fixed to" or "set on" another component, it may be directly or indirectly located on that other component. When a component is referred to as "connected to" another component, it may be directly or indirectly connected to that other component. The terms "upper," "lower," "left," "right," "front," "rear," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate orientations or positions based on the accompanying drawings, and are for ease of description only, and should not be construed as limiting the technical solution. The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features. "A plurality" means two or more, unless otherwise explicitly defined.

[0059] Cylindrical parts are a special type of optical element. They have cylindrical curvature rather than spherical curvature and are long cylindrical in shape. Because the cylindrical shape is that of a long lens, the polishing requirements are strict. Therefore, conventional machining methods cannot meet the requirements for machining this part, or the process is very difficult, and the surface error cannot meet the drawing requirements.

[0060] Among them, elongated cylindrical parts are mainly used to control the propagation characteristics of light beams in one direction. The perpendicularity of its two end faces to the outer cylindrical surface affects the quality of light beam propagation. Cylindrical optical parts are divided into convex cylindrical parts and concave cylindrical parts, which are used to converge and diverge light beams, respectively. When machining convex or concave cylindrical parts using traditional techniques, the outer cylindrical surface of the cylindrical part is positioned by a fixture, and then the two end faces are directly machined. However, the center deviation and perpendicularity error of the machined cylindrical parts are relatively large, which cannot meet the machining quality requirements.

[0061] The following describes a method for processing cylindrical parts according to embodiments of the present application, with reference to the accompanying drawings. The processing method of the present application is applicable to cylindrical parts with one end concave or convex and the other end pointed.

[0062] Furthermore, the names used in this application are explained as follows:

[0063] Raw material: In this application, it refers to an unfinished part used to manufacture optical elements (such as lenses, mirrors, etc.). These parts usually need to undergo a series of processing and treatments before they can become the final optical elements.

[0064] Square bricks: These are workpieces used to assist in the positioning and machining of parts. Square bricks can have positioning structures such as backing plates and cuboids. Square bricks are used as tooling to replicate the angles of parts, achieving high angular accuracy down to the second level. Backing plates can be single-piece plates: these are relatively short, and only one part can be machined from a single backing plate; or they can be long strip backing plates: these are longer, and typically at least two parts can be machined from a single long strip backing plate. Cuboids are used to replicate the perpendicularity between the faces of a part.

[0065] Pairing plate: refers to a tool used to bond to the surface of optical components during the manufacturing process of optical components. It can help operators protect specific surfaces on optical components.

[0066] Glass disk: refers to a glass disk used to support and fix optical components during the assembly of optical parts. In optical components that require high-precision bonding, the glass disk not only provides a stable support platform, but can also serve as a reference surface in the process of optical adhesive bonding.

[0067] Mold: refers to the tool or equipment used to manufacture optical components. It has a high-precision shape and surface quality to accurately position the optical components and ensure that the produced optical components can meet the stringent optical performance requirements.

[0068] See below. Figure 1 , Figure 1 A flowchart illustrating a method for machining the cylindrical part of this application is provided, including the following steps:

[0069] Step S1: Provide blank 1, square brick 2, glass plate 3, and mold 4. (See attached document) Figure 2 and Figure 7 The blank 1 has a first end face 11, a second end face 12 and an outer circular face 13. The mold 4 has a through cavity 41 that matches the size of the blank 1. The through cavity 41 forms a first port 42 and a second port 43 at both ends of the mold 4.

[0070] Step S2: Refer to Figure 3 and Figure 4 The outer circular surface of the blank is attached to the square brick, the square brick is placed on the glass plate, the blank is sealed with wax and filled with wax in sequence, the first end face and the second end face are sanded and polished and leveled to the first parameter threshold, the side sag of the blank is trimmed and the side sag is controlled to be less than the first side sag preset value, and the first part is obtained by lowering the plate.

[0071] Step S3: Bond and fix the first part in the through cavity 41 of the mold 4, so that the first end face 11 is exposed at the first port 42. Bond and fix one side of the second port 43 of the mold 4 to the glass plate 3. Grind and polish the first end face 11 to a convex or concave surface. Unload the first part and check that the center deviation, surface shape and radius of curvature of the first end face 11 reach the second parameter threshold to obtain the second part.

[0072] Step S4: Mill the second end face 12 of the second part into a cone shape, and check that the diameter, cone angle, and coaxiality of the cone angle reach the third parameter threshold to obtain the cylindrical part.

[0073] This application involves bonding the outer circular surface 13 of the blank 1 to the square brick 2, using the side of the square brick 2 to replicate the perpendicularity of the outer circular surface 13, and then trimming the lateral sag of the blank 1 so that the lateral sag of the first end face 11 and the second end face 12 relative to the outer circular surface 13 is less than a first lateral sag preset value. This ensures that the lateral sag and center deviation of the first part meet preset standards before finishing, guaranteeing the machining accuracy during subsequent finishing. Then, the first end face 11 and the second end face 12 are further finished to make the lateral sag of the first end face 11 and the second end face 12 relative to the outer circular surface 13 less than a second lateral sag preset value, further improving the lateral sag accuracy and center deviation of the first part. Finally, through the positioning and engagement of the mold 4, the first end face 11 is sandblasted to a convex or concave surface, and the second end face 12 is milled to a conical shape.

[0074] The processing method described in this embodiment can correct the lateral sag of the cylindrical part before processing the outer shape of both ends of the cylindrical part, ensuring that the cylindrical part has high lateral sag accuracy and center deviation when processing concave and convex surfaces and conical angles. The processing process is simple and convenient, and the processing accuracy is high, which can meet the processing index requirements.

[0075] In some embodiments, in step S2, the side sag of the rough blank 1 includes: performing preliminary sanding and polishing on the first end face 11 and the second end face 12, and smoothing the first end face 11 and the second end face 12 so that the perpendicularity deviation angle between the outer circular surface 13 and the first end face 11 and the second end face 12 is less than the first side sag preset value.

[0076] The purpose of this step is to correct the sag of the cylindrical part and control it within 2'. Only by correcting the sag can we ensure that the included angle between the machined plane and the outer circle is 90°. This step is the first step in ensuring the center deviation.

[0077] Furthermore, by performing step S2, the blank 1 is corrected for lateral sag in the first stage to obtain the first part, and then a second stage of lateral sag finishing is performed to obtain the first part with higher lateral sag accuracy.

[0078] Specifically, the process of sealing and filling the blank with wax includes the following steps:

[0079] Clean the glass plate 3 and the square brick 2. Coarse stripes can be seen on the square brick 2 and the glass plate 3, which meets the conditions for gloss adhesive. Attach the outer circular surface 13 of the blank to the square brick 2 and then attach the square brick 2 to the glass plate 3.

[0080] Clean the blanks and square bricks to remove surface impurities and contaminants;

[0081] Align the blank with the square brick;

[0082] At high temperature, square bricks are fused onto the blank to form the first sealing layer, and the blank is obtained after cooling and wax sealing.

[0083] Heat the alloy wax or resin to a molten state;

[0084] Molten material is injected around the blank and at least half the length of the blank is submerged. The material cools and solidifies to form a blank with a second sealing layer.

[0085] Both sealing with wax and filling with wax can improve the sealing performance and reliability of the encapsulation. Sealing with wax uses glass or metal as a base, which is fused together at high temperature to form a sealed structure. Filling with wax uses a low-melting-point alloy wax to fill the gaps, further improving the sealing performance. Sealing with wax forms a preliminary sealed structure, and filling with wax further strengthens the sealing effect. This allows the first part on the second end face 12 to be sealed and protected when machining the first end face 11, and vice versa, thereby improving machining accuracy.

[0086] Further, in step S2, after the blank is sealed and fixed by wax filling, the first end face 11 and the second end face 12 are sanded, polished, and smoothed to the first parameter threshold, specifically including the following steps:

[0087] The first end face 11 was sanded using a single-axis sander, with the dimension controlled as 72.65 + 0.05.

[0088] Polish the first end face 11 with a polishing machine, and control the light ring to polish the adhesive.

[0089] The second end face 12 was ground using a single-axis grinding machine, with the dimension controlled as 72.41 + 0.01.

[0090] Polish the second end face 12 using a polishing machine, controlling the light aperture to apply the polishing adhesive;

[0091] The lower plate is subjected to parallelism and surface finish tests to ensure that the perpendicularity of the first end face 11 and the second end face 12 to the outer circular surface 13 is less than the second side droop preset value, and the first part is obtained.

[0092] In some embodiments, before sequentially sealing and pouring wax onto the blank part, the following steps are also included:

[0093] A first mounting plate 6 is bonded to the glass plate 3. The first mounting plate 6 surrounds the blank and the surface of the first mounting plate 6 facing away from the glass plate 3 is not lower than the first end face 11.

[0094] During the grinding and polishing of the first end face 11 and the second end face 12, the first mating disc 6 is also ground and polished simultaneously, thereby achieving the effect of protecting specific surfaces on the blank. For example, when the first end face 11 is ground and polished, the first mating disc 6 located around the blank will also be processed simultaneously, reducing the pressure on the blank, reducing damage to the processed surface of the blank, reducing the risk of edge chipping, and thus improving the processing quality and processing accuracy.

[0095] Further, see Figure 5 and Figure 7 The mold 4 is also provided with a plurality of third ports 44 around the first port 42, which are connected to the through hole. In step S3, the first part is bonded and fixed in the through cavity 41 of the mold 4, including:

[0096] See Figure 6 Asphalt 5 is bonded to the outer circular surface 13 around the first end face 11, the second mounting plate 7 is bonded to the asphalt 5, and asphalt 5 is bonded to the second end face 12.

[0097] The second end face 12 of the first part is inserted into the through cavity through the first port 42, so that the second mounting plate 7 is bonded to the third port 44 and the first end face 11 is bonded and exposed to the first port 42, and the second end face 12 of the first part is bonded to the second port 43.

[0098] Understandably, when grinding the first end face 11 and the second end face 12 into concave or convex surfaces, the presence of a second mounting plate 7 around the machining surface can reduce damage to the machining surface, lower the risk of chipping, and thus improve machining quality and precision.

[0099] Furthermore, before inserting the second end face 12 of the first part into the through cavity through the first port 42, the mold 4 is heated to the first temperature. In this way, the asphalt 5 around the first end face 11 can melt and directly adhere to the mold 4. Specifically, the asphalt 5 around the first end face 11 is adhered and fixed to the first port 42, and the asphalt 5 below the second distribution plate 7 is adhered and fixed to the third port 44.

[0100] Further, in step S3, the second port 43 side of the mold 4 is bonded and fixed to the glass disk 3, including:

[0101] When the first part is bonded and fixed in the through cavity 41 of the mold 4, the asphalt 5 on the second end face 12 is exposed to the second port 43.

[0102] The second port 43 of the heating mold 4 is vertically bonded to the glass plate 3, wherein the mold 4 can be bonded to the glass plate 3 by its own weight.

[0103] Further, in step S3, the first end face 11 is sandblasted and polished to a convex or concave surface, including:

[0104] The center deviation of the single-axis grinding machine is controlled at the first taper threshold. The single-axis grinding machine is used to grind the first end face 11 and the mating disc, so that the first end face 11 forms a convex or concave surface. The control dimensions are: 72.38-0.01, and the center deviation is controlled at: Cop8′.

[0105] The first end face 11 and the second mating plate 7 are polished using a ten-axis polishing machine, ensuring consistent length and controlling the radius of curvature, surface shape, and B to reach the preset range.

[0106] In some embodiments, step S3, removing the first part from the pan, includes placing the first part in a gasoline solution to remove it from the pan by immersion or by heating it.

[0107] Further, in step S4, the second end face 12 of the second part is milled into a conical shape, including:

[0108] Adjust the angle of the grinding wheel so that it grinds along the outer circular surface 13 around the second end face 12 of the second part to form the required taper milling to a cone shape.

[0109] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A method for machining cylindrical parts, characterized in that, include: The invention provides a blank, a square brick, a glass plate, and a mold. The blank has a first end face, a second end face, and an outer circular surface. The mold has a through cavity inside that matches the size of the blank. The through cavity forms a first port and a second port at both ends of the mold. The outer circular surface of the blank is attached to the square brick, the square brick is placed on the glass plate, the blank is sealed with wax and filled with wax in sequence, the first end face and the second end face are sanded and polished and leveled to the first parameter threshold, the side sag of the blank is trimmed and the side sag is controlled to be less than the first side sag preset value, and the first part is obtained by lowering the plate. The first part is bonded and fixed inside the through cavity of the mold, so that the first end face is exposed at the first port. The second port side of the mold is bonded and fixed on the glass plate. The first end face is sanded and polished to a convex or concave surface. The first part is removed from the plate and the center deviation, surface shape, and radius of curvature of the first end face are detected to reach the second parameter threshold to obtain the second part. The second end face of the second part is milled into a cone shape, and the diameter, cone angle, and coaxiality of the cone are detected to reach the third parameter threshold to obtain a cylindrical part.

2. The machining method for cylindrical parts according to claim 1, characterized in that, The side droop of the roughened blank includes: The first end face and the second end face are initially sanded and polished to flatten the first end face and the second end face, so that the perpendicularity deviation angle between the outer circular surface and the first end face and the second end face is less than the first lateral droop preset value.

3. The machining method for cylindrical parts according to claim 1, characterized in that, The process of sealing and filling the blank with wax in sequence includes: Clean the blanks and square bricks to remove surface impurities and contaminants; Align the blank with the square brick; At high temperature, square bricks are fused onto the blank to form the first sealing layer, and the blank is obtained after cooling and wax sealing. Heat the alloy wax or resin to a molten state; Molten material is injected around the blank and at least half the length of the blank is submerged. The material cools and solidifies to form a blank with a second sealing layer.

4. The machining method for cylindrical parts according to claim 1, characterized in that, The grinding, polishing, and smoothing of the first and second end faces to a first parameter threshold includes: The first end face and the second end face are sanded using a single-axis sander. Polish the first end face and the second end face using a polishing machine, and control the aperture to polish the adhesive.

5. The method for machining cylindrical parts according to claim 3, characterized in that, Before sequentially sealing and pouring wax onto the blank part, the process also includes: A first mounting plate is bonded to the glass disk, the first mounting plate surrounds the blank, and the surface of the first mounting plate facing away from the glass disk is not lower than the first end face; During the sandblasting and polishing of the first end face and the second end face, the first mating plate is also sandblasted and polished simultaneously.

6. The machining method for cylindrical parts according to claim 1, characterized in that, The mold is further provided with multiple third ports around the first port, which communicate with the through cavity. The process of bonding and fixing the first part within the through cavity of the mold includes: Asphalt is bonded to the outer circular surface around the first end face, a second mating plate is bonded to the asphalt, and asphalt is bonded to the second end face. The second end face of the first part is inserted into the through cavity through the first port, so that the second matching plate is bonded to the third port and the first end face is bonded and exposed to the first port, and the second end face of the first part is bonded to the second port.

7. The method for machining cylindrical parts according to claim 6, characterized in that, The step of bonding and fixing one side of the second port of the mold to the glass plate includes: When the first part is bonded and fixed in the through cavity of the mold, the asphalt on the second end face is exposed at the second port. The second port of the mold is heated, and the second port is vertically bonded to the glass plate.

8. The method for machining cylindrical parts according to claim 6, characterized in that, The step of grinding and polishing the first end face to a convex or concave surface includes: The center deviation of the single-axis sander is controlled at the first taper threshold. The single-axis sander is used to sand the first end face and the second matching plate, so that the first end face forms a convex or concave surface. The first end face and the second mating plate are polished using a ten-axis polishing machine to ensure consistent length.

9. The method for machining cylindrical parts according to claim 1, characterized in that, The first component of the lower plate includes: The first part is placed in a gasoline solution and removed from the plate by immersion or by heating.

10. The method for machining cylindrical parts according to claim 1, characterized in that, The step of milling the second end face of the second part into a conical shape includes: Adjust the angle of the grinding wheel so that it grinds along the outer circular surface around the second end face of the second part to form the required taper milling to a cone shape.

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