Stable supporting device for machining of slender shaft type workpiece with optimized middle section retaining

Abstract

A screw rod shaft (12) is connected to a bearing seat (11) and a sleeve cylinder body (2) in a penetrating mode from back to front, a lever (4) is hinged to the middle of a body shell (1) on the lower side of the sleeve cylinder body (2), and a first supporting block (5) and a second supporting block (6) are installed at the front end of the sleeve cylinder body (2) and the front end of the lever (4) respectively. The included angle smaller than 90 degrees is formed by the supporting working faces of the first supporting block (5) and the second supporting block (6), openings face the cutting force direction, radial cutting force borne by the slender shaft workpiece in the machining process is counteracted, stress deformation of the slender shaft workpiece is eliminated, the workpiece is supported, concession of the workpiece under the action of the cutting force is prevented, machining rigidity, stability and machining efficiency can be improved, and the machining quality is improved. The grinding machining precision of the equidistant arc surface slender shaft workpiece is effectively improved, and it is ensured that the dial indicator jumps within 0.005 mm before and after clamping. The device can adapt to machining of slender shafts with the high precision requirement, can be used for machining technologies such as turning, turn milling and grinding of the slender shafts with the equidistant arc surfaces, and has good universality and popularization value.

Description

Technical Field

[0001] The present invention belongs to the technical field of clamping, supporting and positioning of workpieces or tools in mechanical finishing of surfaces of IPC classification B23Q3 / 00 or workpieces such as adjustable devices of B24B41 / 06, and in particular to a center frame device for supporting machining of slender shaft-type workpieces. Background Art

[0002] At present, the requirements for the dimensional accuracy and shape position accuracy of slender shaft parts are becoming increasingly higher. Due to the small average outer diameter and long length of slender shaft parts, their rigidity is very poor during processing, and they are very easy to deform, affecting the processing accuracy. This poses a great challenge to the traditional grinding processing method of slender shafts.

[0003] In order to prevent deformation during grinding, the workpiece needs to be clamped by two ejectors at the head and tail, and one or more center frames are needed to support the workpiece. There are two commonly used support methods:

[0004] One is that the center stand is directly supported on the outer circle of the workpiece; the disadvantages of this method are: since the slender shaft is very easy to deform, the previous processing cannot guarantee the roundness and cylindricity of the outer circle of the workpiece support part; and when two pins are used to clamp the workpiece during grinding, the workpiece's own weight will also cause deformation, so it is impossible to find the support part by dialing; if the workpiece is forcibly supported by the center stand, the accuracy of the outer circle of the processing will inevitably be unable to be guaranteed.

[0005] The second is that the center frame is supported on the outer circle of the transition sleeve, the transition sleeve is sleeved outside the workpiece, and there are 4 screws at both ends of the transition sleeve to clamp the workpiece; the disadvantages of this method are: before supporting, the outer circle of the transition sleeve is calibrated by a meter, and adjusted by the screws at both ends, but the adjustment screws at both ends affect each other during adjustment, and it is difficult to ensure that the outer circle of the transition sleeve and the outer circle axis of the slender shaft support part are not skewed; in addition, the radial position is directly adjusted by the screws at both ends, which is difficult to control accurately; therefore, the adjustment is time-consuming and labor-intensive and very difficult, not only the efficiency is very low, but also the accuracy is not very high. Few related patent applications are disclosed.

[0006] Patent application 202110927395.X discloses an auxiliary support device for improving the rigidity of machining equidistant arc surface slender shafts, which belongs to the technical field of machining equidistant profile surface slender shafts. The auxiliary support device for improving the rigidity of machining equidistant arc surface slender shafts includes an outer support seat and an inner support plate, the inner support plate is arranged inside the outer support seat, and the rotation center of the inner support plate is consistent with the rotation center of the machine tool spindle, the inner support plate is evenly arranged with a plurality of support holes along the circumference, each support hole is evenly arranged with at least 3 elastic support structures along the circumference, and the axis of the elastic support structure is arranged along the radial direction of the support hole.

[0007] Patent application 201822073191.0 discloses a transition support device for grinding slender shafts, which includes an adjustable structure, two left and right end covers, and a fastening screw. The adjustable structure includes a support ring, a plurality of support blocks, and an adjusting screw; the outer diameter of the support ring is divided into three sections, with a large outer diameter in the middle and small outer diameters at both ends, and its inner hole is provided with a plurality of keyways, and the bottom of the keyways is an inclined surface; the support block is arranged in the keyway, and the inclined surface at its top is tightly matched with the inclined surface at the bottom of the keyway in the support ring, and its bottom is an arc surface; the left and right end covers are respectively pressed tightly against the two ends of the support ring and are fastened to the support ring by fastening screws; an adjusting screw is provided at a position corresponding to each support block on the left and right end covers, and the bottom surface of the adjusting screw is pressed tightly against the end surface of the support block.

[0008] It can be seen that the processing of equidistant circular arc surfaces of slender shafts with large aspect ratios and low rigidity cannot be carried out without auxiliary supports. The existing auxiliary supports used for turning, milling, grinding and other processing of slender shafts are only suitable for processing slender shafts whose outer circle center coincides with the rotation center of the shaft. There is still a lack of auxiliary support methods and devices for processing slender shafts with equidistant circular arc surfaces whose arc center does not coincide with the rotation center of the shaft, and there is even a lack of auxiliary support methods and devices for processing slender shafts with equidistant circular arc surfaces. There is even more of a lack of auxiliary supports for simultaneously processing multiple slender shafts with equidistant circular arc surfaces. In particular, during processing, the middle part is prone to retreat due to its weak rigidity under the action of radial cutting force, resulting in the size of the middle part being larger than the two ends. In the prior art, in order to prevent the workpiece from retreating in the middle section during processing, a few improved middle section stop mechanisms are used as the core part of the device, using hydraulic, pneumatic or mechanical stop mechanisms, which are complex and difficult to meet the requirements of stable and simple work. Summary of the invention

[0009] The present invention proposes a stable support device for machining slender shaft workpieces with optimized middle-section stop, which provides an optimized composite support effect in the middle part of the workpiece, aiming to solve and improve the above-mentioned existing problems.

[0010] To this end, the present invention comprises: a body shell, a sleeve cylinder body, a lever, a first support block, a second support block, a bearing seat, a screw shaft and a bearing plate; a bearing seat is installed at the rear of the body shell where the sleeve cylinder body is installed, a bearing plate is installed in the bearing seat, the screw shaft is connected to the bearing seat and the sleeve cylinder body from back to front, and a lever is hinged in the middle of the body shell on the lower side of the sleeve cylinder body, and the first support block and the second support block are respectively installed at the front end of the sleeve cylinder body and the lever. The supporting working surfaces of the first support block (5) and the second support block (6) form an angle less than 90°, and the opening faces the cutting force direction, offsetting the radial cutting force of the slender shaft workpiece during the processing, eliminating the deformation of the slender shaft workpiece under force, supporting the workpiece and preventing it from retreating when subjected to the cutting force, and ensuring that the dial indicator jumps within 0.005mm before and after clamping.

[0011] A stroke blind hole is opened in the axial direction inside the middle and rear section of the sleeve cylinder body 2, and an inner pressure ring is installed at the rear end of the stroke blind hole.

[0012] Among them, an outer pressure ring is installed on the edge of the rear port of the bearing seat. Specifically, the protrusion in the middle of the front end face of the outer pressure ring is inserted into the edge of the rear port of the bearing seat and presses the bearing disk. The inner wall of the hole in the outer pressure ring clamps the partial outer wall of the rear section of the screw shaft; the edge of the outer pressure ring is fastened to the rear end face of the bearing seat by a cylindrical end screw, and a pressure cap is installed in the middle of the rear end face of the outer pressure ring, that is, the rear end outer sleeve where the screw shaft extends out.

[0013] A blind hole is provided in the middle and rear section of the sleeve cylinder body, an end transverse groove is provided in the middle of the front end face of the sleeve cylinder body, and an inner guide groove of a straight structure is provided in the axial direction on the outer wall of the sleeve cylinder body. The first support block is inserted into the end transverse groove on the front end face of the sleeve cylinder body through the straight ridge protruding in the middle of the rear end face.

[0014] Among them, the clearance between the inner wall of the cylinder sleeve of the body shell and the outer wall of the cylinder sleeve is 0.01mm~0.015mm.

[0015] An annular hinge seat is protruding downwards from the middle of the bottom side of the lever, a screw hole is vertically opened at the rear end of the upper part of the lever, and a screw hole is opened on the front wall of the front edge of the upper part of the lever.

[0016] Furthermore, to achieve the above-mentioned purpose, the present invention is configured as follows: the body shell includes a shell base plate, a support arm, a cylinder sleeve and a reamed hole; a support arm is vertically arranged on the upper side of the shell base plate which is located flat at the bottom and inclined from the front to the middle and upper part, a reamed hole is arranged in the middle of the support arm, and the upper end of the support arm is connected to the cylinder sleeve.

[0017] In particular, an axial through hole is provided inside the cylinder sleeve, a supporting sealing ring is embedded in the annular groove at the inner edge of the middle hole at the rear side of the front cover, and the edge of the front cover is installed on the front end edge of the cylinder sleeve at the upper part of the body shell by fastening screws.

[0018] In particular, an axially extending outer guide groove is provided on the outer wall of the cylinder sleeve.

[0019] Especially, a pressing block is installed at the rear end of the shell base plate at the bottom of the body shell.

[0020] In particular, a screw hole is opened at the rear end of the lever, a screw hole is opened at the bottom surface of the rear section of the cylinder sleeve, and the lifting screw is screwed through the screw hole opened at the rear end of the lever and pressed upward against the bottom surface of the rear section of the cylinder sleeve.

[0021] Compared with the prior art, the beneficial effects of the present invention are: a double-support block support structure with an adjustable angle is provided, the processing rigidity is improved, the supporting force is adjustable, and the grinding accuracy of equidistant arc surface slender shaft workpieces can be effectively improved, the processing rigidity, stability and processing efficiency can be improved, and precise adjustment can be achieved. The auxiliary support device has a compact structure, reliable quality, and is convenient and fast. Especially in the processing of slender shaft workpieces using the "clamp, support, and top" clamping and supporting method, the device is arranged between the clamping claw and the tailstock ejector of the machine tool to offset the radial cutting force on the slender shaft during the processing, thereby eliminating the deformation of the slender shaft under force and ensuring that the dial indicator jumps within 0.005mm before and after clamping. It can adapt to the processing of slender shafts with high precision requirements; it can be used for turning, milling, grinding and other processing technologies of equidistant arc surface slender shafts. It has good versatility and promotion value. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The following drawings are for illustration only and should not be construed as limiting the present invention in any way. By referring to the following drawings, readers can understand the embodiments of the present invention and further understand the advantages and technical features of the present invention.

[0023] Figure 1 This is a schematic diagram of the main cross-sectional structure of Example 1 of the present invention.

[0024] Figure 2 It is a schematic diagram of the side structure of Example 1 of the present invention.

[0025] Figure 3 It is a schematic diagram of the main cross-sectional structure of the body shell in Example 1 of the present invention.

[0026] Figure 4 This is a schematic diagram of the main structure of the cylinder body in Example 1 of the present invention.

[0027] Figure 5 Embodiment 1 of the present invention Figure 4 Schematic diagram of the AA section structure.

[0028] Figure 6 for Figure 4 Schematic diagram of the left end structure of the middle cylinder body.

[0029] Figure 7 for Figure 4 Schematic diagram of the right end structure of the middle cylinder body.

[0030] Figure 8 This is a schematic diagram of the lever structure in Example 1 of the present invention.

[0031] Fig. 9 This is a schematic diagram of the front structural view of the first supporting block in Example 1 of the present invention.

[0032] Fig.10 This is a left-side structural schematic diagram of the first supporting block in Example 1 of the present invention.

[0033] Fig.11 This is a schematic diagram of the cross-sectional structure of the axle pin in Example 1 of the present invention.

[0034] Fig.12 This is a schematic diagram of the end face structure of the shaft pin in Example 1 of the present invention.

[0035] Fig.13 This is a schematic diagram of the right end surface structure of the bearing seat in Example 1 of the present invention.

[0036] Fig.14 This is a schematic diagram of the cross-sectional structure of the bearing seat in Example 1 of the present invention.

[0037] Fig.15 This is a schematic diagram of the cross-sectional structure of the pressure ring in Example 1 of the present invention.

[0038] Fig.16 This is a schematic diagram of the end face structure of the pressure ring in Example 1 of the present invention.

[0039] Fig.17 This is a schematic diagram of the end surface structure of the front cover in Example 1 of the present invention.

[0040] Reference numerals include:

[0041] 1-body shell, 2-cylinder body, 3-workpiece, 4-lever, 5-first bracket, 6-second bracket, 7-axis pin, 8-clamping block, 9-inner pressure ring, 10-inner set screw, 11-bearing seat, 12-screw shaft, 13-bearing plate, 14-outer pressure ring, 15-cylindrical end screw, 16-pressure cap, 17-front cover, 18-support sealing ring, 19-outer set screw, 20-lifting screw;

[0042] 101-shell base plate, 102-support arm, 103-cylinder sleeve, 104-outer guide groove, 105-reaming hole;

[0043] 201-travel blind hole, 202-inner guide groove, 203-end transverse groove. DETAILED DESCRIPTION

[0044] In the description of the present invention, it is also necessary to explain that unless otherwise clearly specified and limited;

[0045] The terms "include", "include", "have" and any variations thereof are intended to cover other possible options under the same logic that are not listed.

[0046] The terms "set", "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 or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements.

[0047] The directions or positional relationships indicated by terms such as "center", "up", "down", "left", "right", "vertical", "horizontal", "inside" and "outside" are based on the directions or positional relationships shown in the accompanying drawings, or are the directions or positional relationships in which the inventive product is usually placed when in use. They are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the invention.

[0048] The terms "first", "second", "third", etc. are only used to distinguish the description and should not be understood as indicating or implying relative importance. In addition, the terms "horizontal", "vertical", "overhanging", etc. do not mean that the components are required to be absolutely horizontal or overhanging, but can be slightly inclined.

[0049] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the invention belongs. In the event of a conflict, the definitions in this specification shall prevail.

[0050] The principle of the present invention is that in order to improve the stability of slender shaft workpieces during the processing, especially in the optimization of mid-section stop, the auxiliary support device should have good rigidity, stability and precision, and be able to adapt to slender shaft workpieces of different sizes and materials to reduce vibration and improve processing accuracy and efficiency.

[0051] As attached Figure 1 and 2 As shown, the present invention includes: a body shell 1, a sleeve cylinder body 2, a lever 4, a first bracket 5, a second bracket 6, a bearing seat 11, a screw shaft 12 and a bearing disk 13; a bearing seat 11 is installed at the rear of the body shell 1 on which the sleeve cylinder body 2 is installed, a bearing disk 13 is installed in the bearing seat 11, the screw shaft 12 is connected to the bearing seat 11 and the sleeve cylinder body 2 from back to front, and a lever 4 is hinged in the middle of the body shell 1 on the lower side of the sleeve cylinder body 2, and the first bracket 5 and the second bracket 6 are installed at the front ends of the sleeve cylinder body 2 and the lever 4 respectively.

[0052] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only embodiments of a part of the present invention, rather than all embodiments.

[0053] Embodiment 1: As attached Figure 3As shown, the body shell 1 includes a shell base plate 101, a support arm 102, a cylinder sleeve 103, an outer guide groove 104 and a reamed hole 105; the support arm 102 is vertically arranged on the upper side of the shell base plate 101 which is located flat at the bottom and is inclined from the front to the middle and upper part, and the reamed hole 105 is arranged in the middle of the support arm 102, and the cylinder sleeve 103 is connected to the upper end of the support arm 102. An axial through hole is arranged inside the cylinder sleeve 103, and the center axis of the cylinder sleeve 103 and its axial through hole extends obliquely backward and upward, and an axially extending outer guide groove 104 is arranged on the outer wall of the cylinder sleeve 103.

[0054] As attached Figure 4 , 5 As shown in FIGS. 6 and 7, the sleeve cylinder body 2 includes a stroke blind hole 201, an inner guide groove 202 and an end transverse groove 203. A stroke blind hole 201 is axially opened inside the middle and rear section of the sleeve cylinder body 2, an end transverse groove 203 is transversely arranged in the middle of the front end surface of the sleeve cylinder body 2, and an inner guide groove 202 with a linear structure is axially opened on the outer wall of the sleeve cylinder body.

[0055] As attached Figure 8 As shown, a circular hinge seat is protruding downward from the middle of the bottom side of the lever 4, a screw hole is vertically opened at the rear end of the upper part of the lever 4, and a screw hole is opened on the front wall of the front edge of the upper part of the lever 4.

[0056] As attached Fig. 9 , 10 As shown, the front end face of the first bracket 5 protrudes in the middle and has an inclined front end face, a straight ridge protrudes in the middle of the rear end face of the first bracket 5, and four screw holes are evenly distributed on the edge of the first bracket 5. The second bracket 6 is similar to the first bracket 5 in structure.

[0057] As attached Fig.11 , 12 As shown, the middle part of the inner end of the shaft pin 7 protrudes, and the outer end surface of the shaft pin 7 symmetrically penetrates two screw holes.

[0058] As attached Fig.13 , 14 As shown, the bearing seat 11 is in the shape of a cube, an axial hole is opened in the axial middle part of the bearing seat 11, the middle part of the front end face of the bearing seat 11 protrudes, through holes are opened in the axial four corners of the bearing seat 11, and threaded countersunk holes are opened in the middle of the inner edges of the outer walls of the four axial sides of the bearing seat 11.

[0059] As attached Fig.15 , 16 As shown, the outer pressure ring 14 is in the shape of a circular plate with an axial hole in the middle. The middle of the front end surface of the outer pressure ring 14 is protruding, and four through holes are evenly distributed on the edge of the outer pressure ring 14. Moreover, the rear sections of these through holes are enlarged.

[0060] As attached Fig.17 As shown, the front cover 17 is in the shape of a square plate with through holes at the four corners, and an annular groove is provided on the inner edge of the rear side of the hole in the front cover 17.

[0061] In the above, the cylinder body 2 is coaxially installed in the cylinder sleeve 103 at the upper part of the body shell 1. Specifically, the support sealing ring 18 is embedded in the annular groove at the inner edge of the middle hole on the rear side of the front cover 17. The edge of the front cover 17 is installed on the front end edge of the cylinder sleeve 103 at the upper part of the body shell 1 by fastening screws. The support sealing ring 18 squeezes the front end outer wall of the cylinder body 2 and fixes it. At the same time, the rear end of the stroke blind hole 201 of the cylinder body 2 in the rear end of the cylinder sleeve 103 at the upper part of the body shell 1 is equipped with an inner pressure ring 9, that is, the edge of the inner pressure ring 9 is fixed on the rear end surface of the cylinder body 2 by the inner set screw 10. Further, a bearing seat 11 is installed on the rear end surface of the cylinder sleeve 103. Specifically, the cylinder sleeve 103 and the bearing seat 11 have the same rectangular outer wall and the same inner diameter of the central axis hole. The front end of the central axis hole of the bearing seat 11 has a reduced diameter structure. The protruding part of the middle part of the front end of the bearing seat 11 is embedded in the rear end edge of the cylinder sleeve 103, and the cylinder sleeve 103 and the bearing seat 11 are connected by long bolts through the corners. Further, the screw shaft 12 is installed in the central axis hole of the bearing seat 11. The slender screw section at the front of the screw shaft 12 is screwed forward through the screw hole in the middle of the inner pressure ring 9 and extends into the stroke blind hole 201 of the sleeve cylinder body 2, forming a front screw thread support structure, and the front and rear sides of the protruding ring platform in the middle of the screw shaft 12 are respectively sleeved with the bearing disk 13 and the outer wall is close to the inner wall of the bearing seat 11 to form a middle support, and then the outer pressure ring 14 is installed on the edge of the rear port of the bearing seat 11. Specifically, the protruding part in the middle of the front end face of the outer pressure ring 14 is inserted into the inner edge of the rear port of the bearing seat 11 and the bearing disk 13 is pressed, and the inner wall of the hole in the outer pressure ring 14 clamps the partial outer wall of the rear section of the screw shaft 12 to form a rear support. Further, the edge of the outer pressure ring 14 is fastened to the rear end face of the bearing seat 11 by a cylindrical end screw 15, and a pressure cap 16 is installed in the middle of the rear end face of the outer pressure ring 14, that is, the rear end outer sleeve where the screw shaft 12 extends.

[0062] In the above, an axially extending outer guide groove 104 is provided on the outer wall of the cylinder sleeve 103 at the upper part of the body shell 1, and a corresponding inner guide groove 202 is provided at the corresponding position of the outer wall of the sleeve cylinder body 2. The cylindrical end of the outer set screw 19 extends from the outer guide groove 104 at the upper part of the body shell 1 into the inner guide groove 202 on the side of the sleeve cylinder body 2 to lock the sleeve cylinder body 2 and prevent it from rotating. The cylinder sleeve 103 is arranged to tilt backward and upward.

[0063] In the above, a reaming hole 105 is horizontally arranged in the middle of the support arm 102 which is arranged upwardly in the middle of the body shell 1, and the middle section of the lever 4 is cross-fitted in the reaming hole 105. The middle section of the support arm 102 is hinged with the middle section of the lever 4 by the axle pin 7 through the reaming hole 105. The rear end of the lever 4 is located at the lower side of the rear section of the cylinder sleeve 103. A screw hole is opened at the rear end of the lever 4, and the lifting screw 20 is screwed through the screw hole at the rear end of the lever 4 and abuts against the bottom surface of the rear section of the cylinder sleeve 103.

[0064] In the above, a first bracket 5 is installed on the front end face of the sleeve cylinder body 2, wherein the first bracket 5 is inserted into the end transverse groove 203 on the front end face of the sleeve cylinder body 2 through the straight ridge protruding in the middle of the rear side end face thereof, and the first bracket 5 is fixed to the front end face of the sleeve cylinder body 2 by screws through the mounting holes at the corners. A second bracket 6 is installed at the front end of the lever 4.

[0065] In the above, a clamping block 8 is installed at the rear end of the shell base plate 101 at the bottom of the body shell 1. The bottom of the clamping block 8 protrudes downward and has an inwardly folded inclined vertical surface corresponding to the inner wall protruding downward at the bottom of the front end of the shell base plate 101. The clamping block 8 is fastened to the rear end edge of the shell base plate 101 by screws. The clamping block 8 is combined with the body shell 1 to fasten the body shell 1 to the machine tool workbench. According to the structure of different machine tool workbenches, the structural type and clamping method of the body shell 1 may be different.

[0066] In the embodiment of the present invention, the outer set screw 19 installed on the body shell 1 is loosened, and the rear end of the screw shaft 12 is rotated with a wrench, so that the inner pressure ring 9 drives the sleeve cylinder body 2 to move forward and backward in the cylinder sleeve 103 of the body shell 1, thereby driving the first support block 5 to move forward and backward, so that the first support block 5 can contact and support the surface of one side of the workpiece 3. At the same time, the lifting screw 20 is turned to make the lever 4 swing around the shaft pin 7, thereby making the second support block 6 move up and down so that it can contact the local surface of the other side of the workpiece 3 and support the workpiece 3. The supporting working surfaces of the first support block 5 and the second support block 6 form a composite support structure with an angle less than 90° and an opening basically facing the direction of the cutting force, which is used to support the workpiece 3 and prevent it from retreating when subjected to the cutting force.

[0067] Preferably, the lifting screw 20 is a M10×45 knurled flat head screw. The clearance between the inner wall of the cylinder sleeve 103 of the body shell 1 and the outer wall of the sleeve cylinder body 2 is 0.01mm-0.015mm; the inner pressure ring 9, the outer pressure ring 14, the screw shaft 12 and the sleeve cylinder body 2 are repair parts. The inner pressure ring 9 and the outer pressure ring 14 make the screw shaft 12 and the sleeve cylinder body 2 rotate flexibly without obvious blocking under the condition that there is no obvious axial movement.

[0068] In this embodiment, for the purpose of clear explanation, the screw holes are regarded as countersunk holes with a hole diameter of 5 mm to 10 mm and a depth of 7 mm to 12 mm.

[0069] Based on the above embodiments of the present invention, although the embodiments of the present invention are described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations shall all fall within the scope defined by the attached claims.

Claims

1. A stable support device for machining slender shaft workpieces with optimized middle-section stop, comprising a body shell (1), a sleeve cylinder body (2), a lever (4), a first support block (5), a second support block (6), a bearing seat (11), a screw shaft (12) and a bearing plate (13); characterized in that: A bearing seat (11) is arranged at the rear of a body shell (1) on which a sleeve cylinder body (2) is installed, a bearing plate (13) is arranged in the bearing seat (11), a screw shaft (12) is connected to the bearing seat (11) and the sleeve cylinder body (2) from the rear to the front, and a lever (4) is hingedly connected to the middle of the body shell (1) on the lower side of the sleeve cylinder body (2), and a first support block (5) and a second support block (6) are respectively arranged at the front ends of the sleeve cylinder body (2) and the lever (4); the supporting working surfaces of the first support block (5) and the second support block (6) form an angle less than 90 degrees, and the opening faces the direction of the cutting force, so as to offset the radial cutting force on the slender shaft workpiece during the processing, eliminate the deformation of the slender shaft workpiece under stress, support the workpiece and prevent it from retreating when subjected to the cutting force, and ensure that the dial indicator jump is within 0.005mm before and after clamping.

2. The stable support device for machining slender shaft workpieces with optimized middle stop according to claim 1 is characterized in that: A stroke blind hole (201) is axially opened in the middle and rear section of the sleeve cylinder body (2), and an inner pressure ring (9) is arranged at the rear end of the stroke blind hole (201).

3. The stable support device for machining slender shaft workpieces with optimized middle stop according to claim 1 is characterized in that: An outer pressure ring (14) is installed on the rear end edge of the bearing seat (11), and the protruding portion in the middle of the front end surface of the outer pressure ring (14) is inserted into the rear end edge of the bearing seat (11) and presses the bearing disc (13). The inner wall of the hole in the outer pressure ring (14) clamps the rear section of the partial outer wall of the screw shaft (12). The edge of the outer pressure ring (14) is fastened to the rear end surface of the bearing seat (11) by a cylindrical end screw (15). A pressure cap (16) is installed in the middle of the rear end surface of the outer pressure ring (14), i.e., the rear end outer sleeve where the screw shaft (12) protrudes.

4. The stable support device for machining slender shaft workpieces with optimized middle stop according to claim 1 is characterized in that: The clearance between the inner wall of the cylinder sleeve (103) of the body shell (1) and the outer wall of the sleeve cylinder body (2) is 0.01 mm to 0.015 mm.

5. The stable support device for machining slender shaft workpieces with optimized middle stop according to claim 1, characterized in that: A circular hinge seat is protruding downwards from the middle of the bottom side of the lever (4), a screw hole is vertically opened at the rear end of the upper part of the lever (4), and a screw hole is opened at the front wall of the front edge of the upper part of the lever (4).

6. The stable support device for machining slender shaft workpieces with optimized middle stop according to claim 1, characterized in that: A stroke blind hole (201) is axially provided in the middle and rear section of the sleeve cylinder body (2); an end transverse groove (203) is transversely provided in the middle of the front end face of the sleeve cylinder body (2); and an inner guide groove (202) of a straight structure is axially provided on the outer wall of the sleeve cylinder body; the first support block (5) is inserted into the end transverse groove (203) on the front end face of the sleeve cylinder body (2) through a straight ridge protruding in a strip shape in the middle of the rear end face.

7. The stable support device for machining slender shaft workpieces with optimized middle stop according to claim 1, characterized in that: The body shell (1) comprises a shell base plate (101), a support arm (102), a cylinder sleeve (103) and a reaming hole (105); the support arm (102) is vertically arranged on the upper side of the shell base plate (101) which is placed flat at the bottom and inclined from the front to the middle and upper part, the reaming hole (105) is arranged in the middle of the support arm (102), and the cylinder sleeve (103) is connected to the upper end of the support arm (102).

8. The stable support device for machining slender shaft workpieces with optimized middle stop according to claim 7, characterized in that: An axial through hole is provided inside the cylinder sleeve (103), a supporting sealing ring (18) is embedded in the annular groove at the inner edge of the middle hole on the rear side of the front cover (17), and the edge of the front cover (17) is mounted on the front end edge of the cylinder sleeve (103) on the upper part of the body shell (1) by means of fastening screws.

9. The stable support device for machining slender shaft workpieces with optimized middle stop according to claim 7, characterized in that: An axially extending outer guide groove (104) is provided on the outer wall of the cylinder sleeve (103).

10. The stable support device for machining slender shaft workpieces with optimized middle stop according to claim 7, characterized in that: The rear end of the lever (4) is provided with a screw hole, and the lifting screw rod (20) is screwed through the screw hole at the rear end of the lever (4) and pressed upward against the bottom surface of the rear section of the cylinder sleeve (103).

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