Auxiliary device for cylinder machining

Abstract

The invention relates to an auxiliary device for cylinder machining. The auxiliary device comprises a mandrel, plug caps arranged at the two ends of the mandrel and an expansion tile coaxially arranged on the mandrel. The expansion tile is constructed to be capable of being opened in the radial outward direction when the plug caps at the two ends of the mandrel get close to each other so as to support the barrel in the radial outward direction. In this way, deformation of the barrel due to cutting of the cutter is avoided, size out-of-tolerance of the barrel after machining is avoided, and the coaxiality of the barrel is effectively guaranteed. And moreover, the clamping shafts are arranged at the two ends of the mandrel, so that the to-be-processed barrel does not need to be directly clamped by a chuck of a processing machine tool, and the deformation of the barrel is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of machine tool processing, and in particular to an auxiliary device for barrel processing. Background Art

[0002] When a machine tool is used to process a cylinder, a conventional chuck is used to clamp the cylinder, which easily causes deformation of the cylinder, especially for a thin-walled cylinder, so that the cylinder has a size deviation after processing and it is difficult to ensure the coaxiality of the cylinder. Summary of the invention

[0003] Based on the above problems existing in the prior art, the present invention provides an auxiliary device for barrel processing to solve the problems of processing deformation, dimensional tolerance, unqualified coaxiality, etc.

[0004] The technical solution adopted by the present invention to solve the technical problem is: to provide an auxiliary device for barrel processing, comprising:

[0005] Mandrel;

[0006] plug caps, disposed at both ends of the core shaft; and

[0007] An expansion shoe is coaxially arranged on the mandrel,

[0008] The expansion shoe is configured to expand in a radially outward direction when the plug caps at both ends of the core shaft are close to each other, so as to support the cylinder in a radially outward direction.

[0009] Furthermore, the expansion shoe 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 shoe in the radial direction.

[0010] Further, the first through groove extends along the axial direction to the first end of the expansion shoe, the second through groove extends along the axial direction to the second end of the expansion shoe, and the first through groove and the second through groove are alternately arranged along the circumferential direction of the expansion shoe.

[0011] Furthermore, a first inclined surface is provided on the plug cap, and second inclined surfaces capable of abutting against the first inclined surface are provided at both ends of the expansion shoe, so that the plug caps at both ends of the core shaft can expand the expansion shoe in a radially outward direction when they approach each other.

[0012] Furthermore, a convex portion is provided on the core shaft, and the convex portion is configured to enable the two expansion shoes arranged on both sides of the convex portion to be expanded in a radially outward direction when the plug caps at both ends of the core shaft are close to each other.

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

[0014] Furthermore, the plug cap is threadably connected to the core shaft so that the plug caps at both ends of the core shaft 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 rotated by the tool to move the plug cap on the core shaft.

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

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

[0018] The beneficial effect of the present invention is as follows: the present invention provides an auxiliary device for barrel processing, comprising a core shaft, plug caps arranged at both ends of the core shaft, and expansion shoes coaxially arranged on the core shaft. The expansion shoes are configured to be able to expand in a radially outward direction when the plug caps at both ends of the core shaft are close to each other, so as to support the barrel in a radially outward direction. In this way, deformation of the barrel due to cutting by the tool is avoided, thereby avoiding dimensional deviations of the barrel after processing, and effectively ensuring the coaxiality of the barrel. Moreover, by arranging clamping shafts at both ends of the core shaft, there is no need for the chuck of the processing machine tool to directly clamp the barrel to be processed, thereby avoiding deformation of the barrel. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0020] Figure 1 Shown is a schematic structural diagram of an auxiliary device for barrel processing.

[0021] Figure 2 Shown Figure 1 The schematic diagram of the structure of the expansion shoe of the auxiliary device used for barrel processing is shown.

[0022] Among them, the figure marks in the figure are: 100, auxiliary device; 10, core shaft; 20, plug cap; 21, first inclined surface; 22, connecting hole; 30, expansion shoe; 301, first end; 302, second end; 31, first through groove; 32, second through groove; 33, second inclined surface; 40, convex portion; 41, third inclined surface; 50, clamping shaft; 200, cylinder. DETAILED DESCRIPTION

[0023] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer, the present invention is now described in detail in conjunction with the accompanying drawings. This figure is a simplified schematic diagram, which only illustrates the basic structure of the present invention in a schematic manner, so it only shows the composition related to the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0024] refer to Figure 1 As shown, the auxiliary device 100 for processing a barrel 200 provided by the present invention comprises a mandrel 10, two plug caps 20 respectively arranged at both ends of the mandrel 10, and an expansion shoe 30 arranged outside the mandrel 10 and coaxially with the mandrel 10. The two plug caps 20 are configured to be able to approach each other along the axial direction of the mandrel 10 when the auxiliary device 100 is located in the barrel 200 to be processed, so that the expansion shoe 30 is spread out along the radial direction of the mandrel 10, so that the expansion shoe 30 supports the barrel 200 in the radial outward direction. Since the auxiliary device 100 can support the barrel 200 in the radial outward direction when the machining machine processes the barrel 200, it can effectively prevent the barrel 200 from being deformed due to the cutting of the tool, thereby avoiding the dimensional deviation of the barrel 200 after processing, and effectively ensuring the coaxiality of the barrel 200.

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

[0026] It should be noted that the cylinder 200 in the present application is a thin-walled cylinder, and its inner diameter is much larger than the wall thickness. Preferably, the inner diameter of the cylinder 200 can be 3 times, 5 times, 10 times, etc., of its wall thickness. The specific multiple can be determined based on the material of the cylinder 200, the precision requirements of the processing part of the cylinder 200, the processing accuracy that can be achieved by the processing machine, and other factors. Therefore, the cylinder 200 whose deformation amount is not within the acceptable range when subjected to the force in the radial direction can be regarded as a thin-walled cylinder, which can be applied to the auxiliary device 100.

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

[0028] In some embodiments, the plug cap 20 is connected to the mandrel 10 by threads, so that the plug caps 20 at both ends of the mandrel 10 can expand the expansion shoe 30 in the radially outward direction through the first inclined surface 21 when approaching each other. And. The plug cap 20 can be moved in the axial direction on the mandrel 10 by rotating the plug cap 20. Preferably, the two plug caps 20 are provided with a connecting hole 22 on the side facing away from each other, which is used to connect tools so that the technician can 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 shoe 30 is roughly a cylindrical structure coaxially arranged with the core shaft 10. The expansion shoe 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 both penetrate the expansion shoe 30 in the radial direction. The first through groove 31 extends in the axial direction to the first end 301 of the expansion shoe 30, and the second through groove 32 extends in the axial direction to the second end 302 of the expansion shoe 30, and the first through groove 31 and the second through groove 32 are alternately arranged in the circumferential direction of the expansion shoe 30, so that the expansion shoe 30 can be expanded in the radial direction when the two ends thereof are subjected to a radially outward force. In this way, the expansion shoe 30 can support the cylinder 200 in the radial direction.

[0030] In some embodiments, the expansion shoe 30 is provided with a second inclined surface 33 at both ends thereof, which is used to abut against the first inclined surface 21 of the plug cap 20. When the technician uses a tool to rotate the plug caps 20 at both ends of the mandrel 10, under the guidance of the thread, the two plug caps 20 can approach each other on the mandrel 10. The two plug caps 20 apply a radially outward supporting force to the expansion shoe 30 through the first inclined surface 21, so that the expansion shoe 30 is expanded in the radially outward direction, so that the expansion shoe 30 can support the barrel 200 to be processed in the radially outward direction.

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

[0032] In some of the embodiments, the expansion shoe 30 can be made of high-strength spring steel 65Mn. After heat treatment, the hardness of the expansion shoe 30 can reach 50-55HRC to ensure that the expansion shoe 30 is deformed and not easily broken under high load conditions. Preferably, after heat treatment, the outer surface of the expansion shoe 30 needs to be finely ground on a grinder to ensure that the roughness value Ra of the outer surface of the expansion shoe 30 can reach 0.8μm, so that there is a gap of 0.1-0.2mm between the outer surface of the expansion shoe 30 and the inner surface of the cylinder 200 when the expansion shoe 30 supports the cylinder 200 in the radially outward direction. In this way, it can effectively ensure that there is sufficient friction between the expansion shoe 30 and the cylinder 200 when forming radial support, and avoid the cylinder 200 from moving relative to the expansion shoe 30 when processing on a processing machine, thereby further ensuring the processing accuracy of the cylinder 200. Moreover, since there is a gap of 0.1 to 0.2 mm between the outer surface of the expansion shoe 30 and the inner surface of the cylinder 200 when radial support is formed, the expansion shoe 30 and the cylinder 200 can be quickly separated when the two plug caps 20 move away from each other, thereby avoiding the expansion shoe 30 and the cylinder 200 being difficult to separate due to being too close, thereby improving the convenience of disassembly.

[0033] It should be noted that when the two plug caps 20 at both ends of the mandrel 10 apply radially outward supporting force to the expansion shoe 30 through the first inclined surface 21, the deformation amount at both ends of the expansion shoe 30 is the largest and the deformation amount in the middle is the smallest. In addition, the deformation amount at both ends of the expansion shoe 30 is related to its own axial length, its own material and other factors. Therefore, once the length of the expansion shoe 30 is too long and the deformation amount in the middle thereof does not meet the expectation, it is difficult to form effective support for the middle part of the cylinder 200 to be processed.

[0034] Recombination Figure 1 As shown, in a preferred embodiment, a convex portion 40 extending radially outward is further provided in the middle of the core shaft 10. A third inclined surface 41 is provided on the side of the convex portion 40 facing the two plug 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 convex portion 40, two expansion shoes 30 can be coaxially arranged on the core shaft 10. When the two plug caps 20 move toward the convex portion 40, the two plug caps 20 cooperate with the convex portion 40 respectively, so that the expansion shoe 30 is expanded in the radial outward direction under the action of the first inclined surface 21 of the plug cap 20 and the third inclined surface 41 of the convex portion 40. Moreover, by providing the convex portion 40, the length of the expansion shoe 30 can be effectively shortened under the premise that the length of the core shaft 10 is determined. In this way, when the two ends of the expansion shoe 30 are subjected to the supporting force applied by the plug cap 20 and the protrusion 40, the expansion shoe 30 can be evenly expanded in the radial outward direction in the axial direction, so that the expansion shoe 30 can evenly support the cylinder 200 in the radial outward direction in the axial direction, so as to further ensure the processing 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 a chuck of a processing machine tool or for abutting against a top of a processing machine tool. The clamping shaft 50 can be connected to the mandrel 10 by a thread. Therefore, by using the auxiliary device 100, it is not necessary to make the chuck of the processing machine tool directly clamp the barrel 200 to be processed, thereby avoiding deformation of the barrel 200.

[0036] Combine the following Figure 1 and Figure 2 , the use of an auxiliary device 100 for processing a barrel 200 provided by the present invention is described in detail.

[0037] After the clamping shaft 50 is connected to the two ends of the mandrel 10, the technician can put the expansion shoe 30 on the mandrel 10, and then preliminarily connect the two plug caps 20 to the two ends of the mandrel 10, as long as the expansion shoe 30 is ensured not to fall off the mandrel 10. In this way, the preliminary assembly of the auxiliary device 100 is completed.

[0038] The technician sets the barrel 200 to be processed on the auxiliary device 100, and then uses the tool to rotate the plug caps 20 at both ends of the mandrel 10, so that the two plug caps 20 are close to each other on the mandrel 10. In this process, the first inclined surface 21 of the plug cap 20 and the third inclined surface 41 of the protrusion 40 jointly abut against the second inclined surfaces 33 at both ends of the expansion shoe 30, so that the expansion shoe 30 is relatively evenly expanded in the radially outward direction in the axial direction until the expansion shoe 30 reliably supports the barrel 200 in the radially outward direction.

[0039] At this time, the technician can install the auxiliary device 100 on the processing machine through the two clamping shafts 50, so as to use the processing machine to process the barrel 200 mounted on the auxiliary device 100. For example, the outer thread is processed on the outer wall of the barrel 200. Specifically, the chuck of the processing machine clamps one clamping shaft 50, and the top of the processing machine abuts against the center of the end face of the other clamping shaft 50. In this way, it is possible to avoid using the chuck to directly clamp the barrel 200, thereby avoiding the deformation of the barrel 200. Moreover, when the processing machine processes the barrel 200, the auxiliary device 100 supports the barrel 200 in the radially outward direction, effectively preventing the barrel 200 from being deformed due to the cutting of the tool, thereby avoiding the size of the barrel 200 after processing, and effectively ensuring the coaxiality of the barrel 200.

[0040] In other embodiments, when it is necessary to process internal threads on the inner wall of the end of the cylinder 200, the clamping shaft 50 supported by the top point can be removed to prevent the clamping shaft from affecting the processing of the internal threads. Then, the technician uses the center frame of the processing machine to hold the auxiliary device 100 and the cylinder 200 to maintain the stability of the cylinder 200 so as to use the turning tool to turn the internal threads on the inner wall of the cylinder 200. It is easy to understand that the internal threads can also be processed on the other end of the cylinder 200 in the same way.

[0041] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection, it can be a mechanical connection, it can be a direct connection, or it can be indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] It should be understood that the orientation or position relationship indicated by terms such as "length", "width", "up", "down", "front and back", "left and right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are based on the orientation or position relationship shown in the drawings, and 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, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0043] Although the present invention has been described with reference to preferred embodiments, various modifications may be made thereto and parts thereof may be replaced by equivalents without departing from the scope of the present invention. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present 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 barrel processing, comprising: Mandrel (10); plug caps (20) are arranged at both ends of the core shaft (10); and An expansion shoe (30) is coaxially arranged on the mandrel (10), in, The expansion shoe (30) is configured to expand in a radially outward direction when the plug caps (20) at both ends of the core shaft (10) are close to each other, so as to support the cylinder (200) in a radially outward direction.

2. The auxiliary device for barrel processing according to claim 1, characterized in that: The expansion shoe (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 shoe (30) in the radial direction.

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

4. The auxiliary device for barrel processing according to claim 2, characterized in that: The plug cap (20) is provided with a first inclined surface (21), and both ends of the expansion shoe (30) are provided with second inclined surfaces (33) capable of abutting against the first inclined surface (21), so that the plug caps (20) at both ends of the core shaft (10) can cause the expansion shoe (30) to be expanded in a radially outward direction when they approach each other.

5. The auxiliary device for barrel processing according to claim 4, characterized in that: The core shaft (10) is provided with a convex portion (40), and the convex portion (40) is configured to enable the two expansion shoes (30) arranged on both sides of the convex portion (40) to be expanded in a radially outward direction when the plug caps (20) at both ends of the core shaft (10) are close to each other.

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

7. The auxiliary device for barrel processing according to any one of claims 1 to 6, characterized in that: The plug cap (20) is threadedly connected to the core shaft (10) so that the plug caps (20) at both ends of the core shaft (10) can be moved closer to each other by rotation.

8. The auxiliary device for barrel 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 rotated by the tool to move the plug cap (20) on the core shaft (10).

9. The auxiliary device for barrel processing according to any one of claims 1 to 6, characterized in that: Clamping shafts (50) are also provided at both ends of the core shaft (10) for mounting the auxiliary device (100) on a chuck of a processing machine tool.

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

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