An auxiliary device for barrel processing

Abstract

The application relates to an auxiliary device for barrel machining, which comprises a mandrel, plug caps arranged at two ends of the mandrel, and a calyx arranged coaxially on the mandrel. The calyx is configured to be expanded in a radially outward direction when the plug caps at the two ends of the mandrel are close to each other, so as to support the barrel in a radially outward direction. In this way, the deformation of the barrel caused by the cutting of a cutter is avoided, the size of the barrel after machining is prevented from being out of tolerance, and the coaxiality of the barrel is effectively ensured. Moreover, by arranging clamping shafts at the two ends of the mandrel, the chuck of a machining machine tool does not need to directly clamp the barrel to be machined, and the deformation of the barrel is avoided.

Description

Technical Field

[0001] This invention relates to the field of machine tool processing technology, and more specifically to an auxiliary device for cylinder processing. Background Technology

[0002] When machining cylinders using machine tools, conventional chucks can easily cause cylinder deformation, especially for thin-walled cylinders. This results in dimensional deviations after machining and makes it difficult to ensure the coaxiality of the cylinders. Summary of the Invention

[0003] In view of the above-mentioned problems in the prior art, the present invention provides an auxiliary device for cylinder processing to solve problems such as processing deformation, dimensional deviation, and coaxiality failure.

[0004] The technical solution adopted by this invention to solve its technical problem is: to provide an auxiliary device for cylinder processing, comprising,

[0005] mandrel;

[0006] Plugs are provided at both ends of the mandrel; and

[0007] The expansion bearings are coaxially arranged on the mandrel.

[0008] The expansion bearing is configured to expand radially outward when the caps at both ends of the mandrel come close to each other, so as to support the cylinder in a radially outward direction.

[0009] Furthermore, the expansion pad is provided with a first through groove and a second through groove extending in the axial direction, and the first through groove and the second through groove penetrate the expansion pad in the radial direction.

[0010] Furthermore, the first through groove extends axially to the first end of the expansion tile, the second through groove extends axially to the second end of the expansion tile, and the first through groove and the second through groove are arranged alternately along the circumferential direction of the expansion tile.

[0011] Furthermore, the plug cap is provided with a first inclined surface, and the two ends of the expansion bearing are provided with a second inclined surface that can abut against the first inclined surface, so that the plug caps at both ends of the mandrel can expand the expansion bearing in a radially outward direction when they come close to each other.

[0012] Furthermore, the mandrel is provided with a protrusion, which is configured to cause the two expansion plates arranged on both sides of the protrusion to open in a radially outward direction when the plugs at both ends of the mandrel come close to each other.

[0013] Furthermore, the protrusion is provided with a third inclined surface for abutting against the second inclined surface, so that the expansion joint between the protrusion and the plug cap is expanded in a radially outward direction when the plug cap moves toward the protrusion.

[0014] Furthermore, the plug is threaded to the mandrel so that the plugs at both ends of the mandrel can be brought closer to each other by rotation.

[0015] Furthermore, the plug cap is provided with a connecting hole for connecting a tool, so that the plug cap can be moved on the mandrel by rotating the plug cap with the tool.

[0016] Furthermore, clamping shafts are provided at both ends of the mandrel for mounting the auxiliary device on the chuck of the machine tool.

[0017] Furthermore, the outer surface roughness of the expansion pad is 0.8 μm, so that there is a gap of 0.1 to 0.2 mm between the outer surface of the expansion pad and the inner surface of the cylinder when the expansion pad supports the cylinder in the radially outward direction.

[0018] The beneficial effects of this invention are as follows: This invention provides an auxiliary device for machining cylinders, comprising a mandrel, caps disposed at both ends of the mandrel, and expansion bearings coaxially arranged on the mandrel. The expansion bearings are configured to expand radially outward when the caps at both ends of the mandrel approach each other, thereby supporting the cylinder in a radially outward direction. This prevents deformation of the cylinder due to cutting by the tool, thus avoiding dimensional deviations after machining and effectively ensuring the coaxiality of the cylinder. Furthermore, by providing clamping shafts at both ends of the mandrel, it is unnecessary for the chuck of the machine tool to directly clamp the cylinder to be machined, thus avoiding deformation of the cylinder. Attached Figure Description

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0020] Figure 1 The diagram shows a schematic of an auxiliary device for cylinder processing.

[0021] Figure 2 As shown Figure 1 The diagram shows the structure of the expansion bearing of the auxiliary device used for cylinder processing.

[0022] In the figure, the reference numerals are as follows: 100, auxiliary device; 10, mandrel; 20, plug cap; 21, first inclined surface; 22, connecting hole; 30, expansion bearing; 301, first end; 302, second end; 31, first through groove; 32, second through groove; 33, second inclined surface; 40, protrusion; 41, third inclined surface; 50, clamping shaft; 200, cylinder. Detailed Implementation

[0023] To make the technical problem to be solved, the technical solution, and the beneficial effects of this invention clearer, the invention will now be described in detail with reference to the accompanying drawings. This drawing is a simplified schematic diagram, illustrating only the basic structure of the invention, and therefore only shows the components relevant to the invention. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0024] refer to Figure 1 As shown, the present invention provides an auxiliary device 100 for machining a cylinder 200, comprising a mandrel 10, two caps 20 respectively disposed at both ends of the mandrel 10, and expansion bearings 30 arranged coaxially with and outside the mandrel 10. The two caps 20 are configured to approach each other along the axial direction of the mandrel 10 when the auxiliary device 100 is located inside the cylinder 200 to be machined, so that the expansion bearings 30 are expanded along the radial direction of the mandrel 10, thereby supporting the cylinder 200 in a radially outward direction. Since the auxiliary device 100 can support the cylinder 200 in a radially outward direction during machining on a machine tool, it can effectively prevent deformation of the cylinder 200 due to cutting by the tool, thereby avoiding dimensional deviations after machining and effectively ensuring the coaxiality of the cylinder 200.

[0025] It should be noted that, in this application, radial refers to the radial direction of the mandrel 10, and axial refers to the axial direction of the mandrel 10.

[0026] It should be noted that the cylinder 200 in this application is a thin-walled cylinder, with its inner diameter being much larger than its wall thickness. Preferably, the inner diameter of the cylinder 200 can be a multiple of its wall thickness, such as 3, 5, or 10 times. The specific multiple can be determined comprehensively based on factors such as the material of the cylinder 200, the precision requirements of the machined parts of the cylinder 200, and the machining precision achievable by the machine tool. Therefore, cylinders 200 whose deformation under radial force is outside the acceptable range can be considered thin-walled cylinders and can be used in the auxiliary device 100.

[0027] Combination Figure 1 As shown, in some embodiments, the plug 20 is an annular structure arranged between the mandrel 10 and the expansion bearing 30. The plug 20 has a first inclined surface 21 on the side facing the expansion bearing 30, for applying a radially outward supporting force to the expansion bearing 30. Preferably, the plug 20 is made of 15mm thick steel to ensure its rigidity.

[0028] In some embodiments, the plug cap 20 is threadedly connected to the mandrel 10, so that when the plug caps 20 at both ends of the mandrel 10 are brought close together, the expansion bearing 30 is expanded radially outward through the first inclined surface 21. Furthermore, the plug cap 20 can be moved axially on the mandrel 10 by rotating it. Preferably, each of the two plug caps 20 has a connecting hole 22 on its opposite side for connecting a tool, allowing a technician to rotate the plug cap 20. The connecting hole 22 can be a threaded hole.

[0029] refer to Figure 1 and Figure 2 As shown, in some embodiments, the expansion bearing 30 is generally a cylindrical structure coaxially arranged with the mandrel 10. The expansion bearing 30 is provided with a first through groove 31 and a second through groove 32 extending axially, both of which penetrate the expansion bearing 30 radially. The first through groove 31 extends axially to a first end 301 of the expansion bearing 30, and the second through groove 32 extends axially to a second end 302 of the expansion bearing 30. The first through groove 31 and the second through groove 32 are alternately arranged circumferentially with respect to the expansion bearing 30, allowing the expansion bearing 30 to expand radially when subjected to radially outward forces at both ends. This enables the expansion bearing 30 to support the cylinder 200 radially.

[0030] In some embodiments, the expansion bearing 30 has second inclined surfaces 33 at both ends for abutting against the first inclined surface 21 of the plug cap 20. When a technician uses a tool to rotate the plug caps 20 at both ends of the mandrel 10, the two plug caps 20 can move closer to each other on the mandrel 10 under the guidance of the threads. The two plug caps 20 apply a radially outward supporting force to the expansion bearing 30 through the first inclined surface 21, causing the expansion bearing 30 to expand in a radially outward direction, thereby enabling the expansion bearing 30 to support the cylinder 200 to be processed in a radially outward direction.

[0031] In this embodiment, the inclination of both the first inclined surface 21 and the second inclined surface 33 is 30°.

[0032] In some embodiments, the expansion pad 30 can be made of high-strength spring steel 65Mn. After heat treatment, the hardness of the expansion pad 30 can reach 50-55 HRC to ensure that the expansion pad 30 does not easily break under high load conditions. Preferably, after heat treatment, the outer surface of the expansion pad 30 needs to be precision ground on a grinding machine to ensure that the surface roughness Ra of the outer surface of the expansion pad 30 can reach 0.8 μm, so that there is a gap of 0.1-0.2 mm between the outer surface of the expansion pad 30 and the inner surface of the cylinder 200 when the expansion pad 30 supports the cylinder 200 in the radial outward direction. This can effectively ensure that there is sufficient friction between the expansion pad 30 and the cylinder 200 when forming radial support, and prevent the cylinder 200 from moving relative to the expansion pad 30 during machining on the machine tool, thereby further ensuring the machining accuracy of the cylinder 200. Furthermore, since there is a gap of 0.1 to 0.2 mm between the outer surface of the expansion pad 30 and the inner surface of the cylinder 200 when forming radial support, the expansion pad 30 and the cylinder 200 can be quickly separated when the two plug caps 20 are far apart, thereby avoiding the expansion pad 30 and the cylinder 200 being too close together and difficult to separate, so as to improve the convenience of disassembly.

[0033] It should be noted that when the two caps 20 at both ends of the mandrel 10 apply a radially outward supporting force to the expansion bearing 30 through the first inclined surface 21, the deformation at both ends of the expansion bearing 30 is the largest, while the deformation in the middle is the smallest. Furthermore, the deformation at both ends of the expansion bearing 30 is related to its axial length, material, and other factors. Therefore, if the length of the expansion bearing 30 is too long, causing the deformation in the middle to fall short of expectations, it will be difficult to provide effective support for the middle part of the cylinder 200 to be processed.

[0034] Combined again Figure 1 As shown, in a preferred embodiment, the mandrel 10 is further provided with a radially outwardly extending protrusion 40 at its center. Each of the protrusions 40 has a third inclined surface 41 on the side facing the two caps 20. The third inclined surface 41 has the same inclination as the first inclined surface 21 and the second inclined surface 33. By providing the protrusion 40, two expansion bearings 30 can be coaxially arranged on the mandrel 10. When the two caps 20 move toward the protrusion 40, the two caps 20 respectively engage with the protrusion 40, causing the expansion bearings 30 to expand radially outward under the action of the first inclined surface 21 of the caps 20 and the third inclined surface 41 of the protrusion 40. Moreover, by providing the protrusion 40, the length of the expansion bearings 30 can be effectively shortened given a fixed length of the mandrel 10. This allows the expansion pads 30 to be evenly expanded radially outward in the axial direction when supported by the plug caps 20 and the protrusions 40 at both ends, thus enabling the expansion pads 30 to evenly support the cylinder 200 radially outward in the axial direction, thereby further ensuring the machining accuracy of the cylinder 200.

[0035] refer to Figure 1 As shown, in some preferred embodiments, clamping shafts 50 are also provided at both ends of the mandrel 10 for clamping by the chuck of the machine tool or for supporting by the center of the machine tool. The clamping shafts 50 can be connected to the mandrel 10 by threads. Therefore, by using the auxiliary device 100, it is not necessary to have the chuck of the machine tool directly clamp the cylinder 200 to be processed, thus avoiding deformation of the cylinder 200.

[0036] The following is combined with Figure 1 and Figure 2 The use of the auxiliary device 100 for processing cylinder 200 provided by the present invention will be described in detail.

[0037] After connecting the clamping shaft 50 to both ends of the mandrel 10, the technician can fit the expansion bearing 30 onto the mandrel 10, and then initially connect the two plugs 20 to both ends of the mandrel 10, ensuring that the expansion bearing 30 does not fall off the mandrel 10. This completes the initial assembly of the auxiliary device 100.

[0038] Technicians mount the cylinder 200 to be processed onto the auxiliary device 100, and then use the tool to rotate the caps 20 at both ends of the mandrel 10, bringing the two caps 20 closer together on the mandrel 10. During this process, the first inclined surface 21 of the cap 20 and the third inclined surface 41 of the protrusion 40 together abut against the second inclined surface 33 at both ends of the expansion bearing 30, causing the expansion bearing 30 to expand relatively evenly in the axial direction in the radially outward direction until the expansion bearing 30 reliably supports the cylinder 200 in the radially outward direction.

[0039] At this point, technicians can mount the auxiliary device 100 onto a machine tool using the two clamping shafts 50, so that the machine tool can be used to process the cylinder 200 mounted on the auxiliary device 100. For example, external threads can be machined on the outer wall of the cylinder 200. Specifically, the chuck of the machine tool clamps one clamping shaft 50, and the center of the machine tool abuts against the center of the end face of the other clamping shaft 50. This avoids directly clamping the cylinder 200 with the chuck, preventing deformation of the cylinder 200. Moreover, when the machine tool is processing the cylinder 200, the auxiliary device 100 supports the cylinder 200 in a radially outward direction, effectively preventing deformation of the cylinder 200 due to cutting by the tool, thereby avoiding dimensional deviations after processing and effectively ensuring the coaxiality of the cylinder 200.

[0040] In other embodiments, when it is necessary to machine internal threads on the inner wall of the end of the cylinder 200, the clamping shaft 50 held by the center can be removed to avoid the clamping affecting the machining of the internal threads. Then, a technician uses the center rest of a machine tool to support the auxiliary device 100 and the cylinder 200, maintaining the stability of the cylinder 200, so that the internal threads can be machined on the inner wall of the cylinder 200 using a turning tool. It is readily understood that internal threads can also be machined at the other end of the cylinder 200 in the same manner.

[0041] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0042] It should be understood that the terms "length", "width", "up", "down", "front and back", "left and right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0043] Although the invention has been described with reference to preferred embodiments, various modifications can be made and components can be replaced with equivalents without departing from the scope of the invention. In particular, the technical features mentioned in the various embodiments can be combined in any manner as long as there is no structural conflict. The invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. An auxiliary device for cylinder machining, comprising: mandrel (10); Plugs (20) are disposed at both ends of the mandrel (10); and The expansion bearings (30) are coaxially arranged on the mandrel (10). in, The expansion bearing (30) is configured to expand radially outward when the plugs (20) at both ends of the mandrel (10) come close to each other, so as to support the cylinder (200) radially outward. The mandrel (10) is also provided with clamping shafts (50) at both ends for mounting the auxiliary device (100) on the chuck of the machine tool. The clamping shafts (50) are threadedly connected to the mandrel (10) so that the clamping shafts (50) that abut against the machine tool can be removed from the mandrel (10), thereby facilitating the use of turning tools to machine internal threads on the inner wall of the cylinder (200).

2. The auxiliary device for cylinder processing according to claim 1, characterized in that, The expansion tile (30) is provided with a first through groove (31) and a second through groove (32) extending in the axial direction, and the first through groove (31) and the second through groove (32) penetrate the expansion tile (30) in the radial direction.

3. The auxiliary device for cylinder processing according to claim 2, characterized in that, The first through groove (31) extends axially to the first end (301) of the expansion tile (30), and the second through groove (32) extends axially to the second end (302) of the expansion tile (30), and the first through groove (31) and the second through groove (32) are arranged alternately along the circumferential direction of the expansion tile (30).

4. The auxiliary device for cylinder processing according to claim 2, characterized in that, The plug cap (20) is provided with a first inclined surface (21), and the two ends of the expansion bearing (30) are provided with a second inclined surface (33) that can abut against the first inclined surface (21), so that the plug caps (20) at both ends of the mandrel (10) can expand the expansion bearing (30) in a radially outward direction when they come close to each other.

5. The auxiliary device for cylinder processing according to claim 4, characterized in that, The mandrel (10) is provided with a protrusion (40) configured to cause the two expansion plates (30) arranged on both sides of the protrusion (40) to open in a radially outward direction when the plugs (20) at both ends of the mandrel (10) come close to each other.

6. The auxiliary device for cylinder processing according to claim 5, characterized in that, The protrusion (40) is provided with a third inclined surface (41) for abutting against the second inclined surface (33) so that the expansion joint (30) between the protrusion (40) and the plug (20) is opened in a radially outward direction when the plug (20) moves toward the protrusion (40).

7. The auxiliary device for cylinder processing according to any one of claims 1-6, characterized in that, The plug (20) is threaded to the mandrel (10) so that the plugs (20) at both ends of the mandrel (10) can be brought closer to each other by rotation.

8. The auxiliary device for cylinder processing according to claim 7, characterized in that, The plug cap (20) is provided with a connecting hole (22) for connecting a tool so that the plug cap (20) can be moved on the spindle (10) by rotating the plug cap (20) with the tool.

9. The auxiliary device for cylinder processing according to any one of claims 1-6, characterized in that, The outer surface roughness of the expansion pad (30) is 0.8 μm, so that there is a gap of 0.1 to 0.2 mm between the outer surface of the expansion pad (30) and the inner surface of the cylinder (200) when the expansion pad (30) supports the cylinder (200) in the radially outward direction.

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