Elastic lifting device and method of using the same

Abstract

The present invention discloses an elastic pulling and jacking device and a method for using the same, which belongs to the field of mechanical processing and includes a tapered shank body, a centering body, a sleeve, and a top ring. The tapered shank body in the tapered shank assembly is fixed to the tailstock on the lathe, so that the position of the tapered shank body is determined, and an axial preload is applied to the centering body and the sleeve respectively by a first elastic member and a second elastic member respectively provided on the inner and outer wall surfaces of the tapered shank body. The preload applied to the sleeve is transmitted to the top ring, so that the workpiece is always subjected to the tension from the top ring and the jacking from the centering body, thereby achieving fixation of the workpiece. The present invention provides an elastic pulling and jacking device and a method for using the same, which applies tension and jacking to the end of the workpiece, and can be elastically adjusted according to the thermal deformation of the workpiece, so as to reduce the vibration of the workpiece during the turning process and effectively improve the processing quality and efficiency of the turning.

Description

Technical Field

[0001] The present invention relates to, in particular to, an elastic pulling device and a method for using the same. Background Art

[0002] During the metal cutting process, cutting heat is generated. This heat is transferred to the workpiece, causing it to heat up and, in turn, stretch and deform. When turning general shaft parts, the effects of thermal deformation are limited and can be ignored. However, when turning slender shafts, due to the long workpiece and the large elongation, the shaft may bend and deform, and may even become stuck between the centers. Therefore, the effects of thermal deformation must be considered when machining slender shafts.

[0003] There are currently two commonly used elastic tips for thermal deformation of slender shafts. One uses the deformation of a butterfly spring to compensate for axial deformation. However, the deformation of a butterfly spring is generally small and is suitable for slender shafts with thermal deformation not exceeding 0.5mm. For many slender shafts with larger deformations, the workpiece still bends or gets stuck due to obstruction of axial elongation, seriously affecting the machining accuracy and efficiency of the slender shaft. The other method uses a cylindrical spring to support the tip to compensate for the larger thermal deformation. The support force of this type of tip on the workpiece is balanced with the deformation force of the spring. In actual use, the preload force varies with the deformation of the workpiece, making it difficult to maintain stability. There is a risk of insufficient tightening force, which is a major safety hazard.

[0004] Therefore, there is a need to propose a new type of elastic top for slender shafts, which can apply a clamping force and a tensioning force to the workpiece at the same time, and reduce the vibration of the workpiece during the processing by providing a constant clamping force. Summary of the Invention

[0005] In response to one or more of the above-mentioned defects or improvement needs in the prior art, the present invention provides an elastic pulling and jacking device and a method for using the same, wherein the tapered shank body in the tapered shank assembly is fixed, and an axial pre-tightening force is applied to the top body and the sleeve respectively by a first elastic member and a second elastic member respectively arranged on the inner and outer wall surfaces of the tapered shank body, so that the workpiece is always subjected to the tensioning force from the top ring and the pushing force from the top body, thereby achieving the fixation of the workpiece, reducing the vibration of the workpiece during the turning process, and effectively improving the processing quality and efficiency of the turning.

[0006] To achieve the above-mentioned purpose, the present invention provides an elastic pulling device, which includes a top body and a tapered handle body for mounting the top body, and is characterized in that:

[0007] One end of the taper shank body is provided with a blind hole for mounting the top body, and one end thereof is provided with a fixing block for fixed connection with the tailstock of the lathe, and

[0008] A first elastic member is provided between the tapered shank body and the top body, for applying a pre-tightening force to the top body so that the top body presses against a workpiece; and

[0009] Also includes a collet and a top ring for fixing the workpiece.

[0010] The collet is sleeved on the outer periphery of the taper shank body and is correspondingly connected to the top ring, so that the workpiece is pressed against the top body to fix the end of the workpiece, and

[0011] A second elastic member is further provided between the tapered shank body and the sleeve, and a pre-tightening force in the axial direction is applied to the sleeve by the second elastic member, so that the top ring applies a tensioning force to the workpiece.

[0012] As a further improvement of the present invention, the blind hole on the tapered handle body is a stepped hole, and

[0013] The top body can be divided into a tip and a barrel along the axial direction. The outer periphery of the barrel is a stepped structure. The first elastic member is sleeved on the top body, one end of which is connected to the step end face on the top body, and the other end of which is connected to the step end face on the stepped hole.

[0014] As a further improvement of the present invention, a plurality of sleeves are arranged at intervals along the axial direction on the outer periphery of the top body, and a notch is opened at one end of the sleeve, and

[0015] The two ends of the first elastic member are respectively connected to the end surfaces of the two sleeve notches, and the other end of the sleeve can be in contact with the stepped end of the top body and / or the tapered shank assembly.

[0016] As a further improvement of the present invention, the outer periphery of the cone handle body can be divided into a sealing section, a movable section and an outer cone section in sequence along the axial direction, wherein the outer diameter of the sealing section is larger than the outer diameter of the movable section, and

[0017] The interior of the jacket is a stepped hole structure, the inner peripheral wall of the large diameter hole section fits with the outer peripheral wall of the sealing section, and the inner peripheral wall of the small diameter hole section fits with the outer peripheral wall of the movable section, and

[0018] The second elastic member is sleeved on the outer circumference of the movable section, one end of the second elastic member is connected to the end surface of the sealing section, and the other end of the second elastic member is connected to the end surface of the small-diameter hole section of the jacket.

[0019] As a further improvement of the present invention, the elastic pulling device also includes a bearing assembly, the bearing assembly includes a first bearing sleeved on the top body and a second bearing sleeved on the movable section of the tapered shank assembly, and the bearings are multiple and arranged at intervals along the axial direction, so that the sleeve and the top body can rotate relative to the tapered shank body.

[0020] As a further improvement of the present invention, an oil filling hole is further provided on the side wall of the jacket, and a through hole penetrating the inner and outer walls of the tapered handle main movable section is also provided on the side wall of the jacket, so that the annular space where the first elastic member and the second elastic member are located can be filled with lubricating oil, and

[0021] The interior of the tip body is provided with a receiving cavity which is in communication with the annular space where the first elastic member is located, and the tip is provided with an oil outlet which is in communication with the outside and the receiving cavity, so that gas and / or lubricating oil can flow out.

[0022] As a further improvement of the present invention, a limiting member is further provided on the end face of the sealing section of the tapered handle body, and a through hole is opened in the middle of the limiting member. The inner diameter of the through hole is smaller than the outer diameter of the cylindrical portion of the top body and larger than the outer diameter of the tip, so that the tip of the top body passes through the through hole and limits the cylindrical portion.

[0023] As a further improvement of the present invention, the top ring is threadedly matched with the jacket so that the jacket can be rotated to adjust the relative position of the top ring and the jacket in the axial direction, and

[0024] A tightening screw is further provided between the jacket and the top ring to strengthen the connection between the two.

[0025] The present invention also discloses a method for using the elastic pulling device, which is implemented based on the above elastic pulling device and is characterized in that it includes the following steps:

[0026] S1, assemble top components,

[0027] One of the first bearings and one of the sleeves are sequentially sleeved on the second tip section of the tip body along the axial direction, and the first elastic member is sleeved on the outer circumference of the sleeve and abutted against the end face of the notch, and then the other sleeve and the other of the first bearing are sequentially sleeved;

[0028] S2, assemble the taper handle assembly,

[0029] The second bearing, washer and second elastic member are sleeved on the movable section of the tapered handle body, and the installation process is the same as that in step S1;

[0030] A fixing block is installed at the end of the outer cone section of the cone handle body;

[0031] S3, putting the collet on the taper handle assembly,

[0032] Install sealing rings at two sealing grooves on the inner peripheral wall of the jacket, and sleeve the jacket onto the tapered shank assembly until the bearing on the tapered shank assembly contacts the stepped end surface of the jacket inner hole;

[0033] S4. Connect the top assembly and the taper shank assembly.

[0034] Install the tip assembly into the blind hole of the tapered shank assembly, so that the first bearing on the tip assembly contacts the stepped end surface of the stepped hole inside the tapered shank body, and the tip of the tip body protrudes from the end surface of the tapered shank body;

[0035] Install the limiting piece, and while the tip of the top body is exposed, press the cylindrical portion of the top body into the tapered shank body, so that the first elastic piece on the top assembly is compressed until the limiting piece contacts the end surface of the sealing section of the tapered shank body, and the two are fixedly connected;

[0036] S5, fixed taper handle body,

[0037] Insert the outer cone section of the taper shank body into the tailstock of the lathe, and insert the fixing block into the tailstock. Align the screw holes on the fixing block with the screw holes on the tailstock, and set the fastening screws accordingly to achieve a reliable connection between the taper shank assembly and the tailstock.

[0038] S6. Install the top ring.

[0039] The top ring is sleeved on the tail end of the workpiece and matched with the thread between the sleeve, the top ring is fixedly connected to the workpiece, and the top ring is fixedly connected to the sleeve by bolts, thereby realizing the fixation of one end of the workpiece by the elastic pulling device.

[0040] As a further improvement of the present invention, the process of installing the top ring also includes adjusting the top force and the tensioning force:

[0041] The adjustment of the pressing force includes adjusting the axial position of the tailstock so that the tip of the top body presses against the workpiece, and adjusting the compression amount of the first elastic member to achieve the adjustment of the pressing force on the workpiece;

[0042] The adjustment of the tensioning force includes: after the top ring is fixed to the workpiece, the top ring is matched with the sleeve thread, the sleeve is rotated relative to the tapered handle body to adjust the axial relative position between it and the top ring, and by adjusting the compression amount of the second elastic member to adjust the pre-tightening force of the second elastic member on the sleeve, and then the sleeve is fixedly connected to the top ring, and the pre-tightening force applied to the sleeve by the second elastic member is transmitted to the top ring and finally converted into a tensioning force on the workpiece.

[0043] The above-mentioned improved technical features can be combined with each other as long as they do not conflict with each other.

[0044] In general, the above technical solutions conceived by the present invention have the following beneficial effects compared with the prior art:

[0045] (1) The elastic pulling and jacking device of the present invention and its use method, the pulling and jacking device comprises a tapered shank body, a centering body, a sleeve and a top ring, the sleeve is sleeved on the tapered shank body, the centering body is correspondingly arranged in the tapered shank body, the tapered shank body is fixedly connected to the lathe, and a first elastic member and a second elastic member are respectively arranged on the inner and outer wall surfaces of the tapered shank body to apply an axial pre-tightening force to the centering body and the sleeve, and the pre-tightening force applied to the sleeve is transmitted to the top ring, so that the workpiece is always subjected to the tensioning force from the top ring and the pushing force from the centering body, thereby ensuring the fixation of the end of the workpiece and reducing the vibration of the workpiece during turning;

[0046] (2) The elastic pulling device of the present invention and its use method are characterized by providing a first bearing and a second bearing on the outer periphery of the second tip section of the tip body and the outer periphery of the movable section of the taper shank body, respectively, so that the tip body and the collet can rotate relative to the taper shank assembly, so as to rotate with the workpiece during the turning process;

[0047] (3) The elastic top-pull device of the present invention and its use method are as follows: by providing an oil filling hole on the side wall of the jacket and a through hole penetrating the inner and outer walls of the movable section of the taper shank body, lubricating oil can enter the space where the bearings and springs are located to lubricate the rotating parts; at the same time, the accommodating cavity and oil outlet hole on the top body allow gas and / or lubricating oil to flow out, facilitating oil filling and avoiding obstruction to the telescopic movement of the structural parts.

[0048] (4) The elastic pulling device of the present invention and its use method match the threads of the sleeve and the top ring so that the relative position of the top ring and the sleeve in the axial direction can be adjusted by rotation, thereby adjusting the relative position between the sleeve and the tapered handle body, and then achieving the adjustment of the compression amount of the second spring. The preload force applied by the second spring lock is the tensioning force of the top ring on the workpiece, thereby completing the adjustment of the tensioning force on the workpiece;

[0049] (5) The elastic top-pull device of the present invention and its method of use are such that, when the slender shaft is being turned, it will be deformed due to heat, and the entire shaft will be stretched to a certain extent. The top body will shrink accordingly, and one end of the slender shaft will be tightened by the top ring and will always be in a straight state, thereby reducing vibration during the turning process. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] Figure 1 2 is a schematic diagram of the overall structure of the elastic lifting device in an embodiment of the present invention;

[0051] Figure 2 This is a schematic diagram of the overall structure of the top assembly in an embodiment of the present invention;

[0052] Figure 3 1 is a schematic diagram of the overall structure of the tapered handle assembly in an embodiment of the present invention;

[0053] Figure 4 2 is a schematic structural diagram of a jacket according to an embodiment of the present invention;

[0054] Figure 5 2 is a schematic structural diagram of the top ring in an embodiment of the present invention;

[0055] Figure 6 This is a schematic diagram of the overall structure of the elastic jacking and pulling device in the embodiment of the present invention during use;

[0056] In all the drawings, the same figure marks represent the same technical features, specifically: 1. Center assembly; 101. Center body; 102. First bearing; 103. Bushing; 104. First spring; 2. Taper shank assembly; 201. Taper shank body; 202. Limiting piece; 203. Second bearing; 204. Second spring; 205. Washer; 206. Fixing block; 3. Jacket; 301. Oil filling hole; 302. Tightening hole; 4. Top ring; 401. Fixing hole; 5. Tail stock; 6. Workpiece. DETAILED DESCRIPTION

[0057] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only intended to illustrate the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

[0058] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0059] Furthermore, 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 the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0060] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0061] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0062] Example:

[0063] See also Figures 1 to 6 The elastic pulling device and its use method in a preferred embodiment of the present invention include a tip assembly, a tapered shank assembly, a collet, and a top ring. The tip assembly is correspondingly mounted on the tapered shank assembly, which is covered with a collet. The top ring is designed to fit over the outer periphery of a slender shaft and is fixedly connected to the collet, so that the end face of one end of the slender shaft abuts against the tip of the tip assembly, thereby achieving pulling of the slender shaft during machining.

[0064] Specifically, such as Figures 1 to 3 As shown in the figure, the taper shank assembly 2 includes a taper shank body 201, which has a blind hole axially opened inside, and the blind hole is a stepped hole. The blind hole is correspondingly provided with a top assembly 1, and the top assembly 1 includes a top body 101. The top body 101 includes a tip and a barrel arranged along the axial direction. The outer circle of the barrel is a stepped structure and can be divided into a first top section and a second top section. The first top section is close to the tip of the top body 101, and its outer peripheral wall surface is the largest outer peripheral surface. Its largest outer peripheral surface is in contact with the inner peripheral wall surface of the large diameter hole section in the blind hole in the taper shank assembly 2, while the second top section is a section away from its tip, and its outer diameter is smaller, which can extend into the small diameter hole section in the blind hole. Furthermore, a groove is opened on the inner peripheral wall surface of the large diameter hole section of the blind hole for arranging a sealing member to achieve a seal between the taper shank body 201 and the top body 101.

[0065] Furthermore, a first elastic member is provided between the tip body 101 and the tapered shank body 201. The first elastic member applies an elastic preload force to the tip body 101 and the tapered shank body 201, respectively, so that when the tip of the tip body 101 is in close contact with the workpiece 6, the tip body 101 can move axially as the first elastic member deforms. Further preferably, the first elastic member is a first spring 104, which is sleeved on the outer circumferential wall of the second tip segment. One end of the first spring 104 is in contact with the end face of the first tip segment, and the other end is in contact with the end face of the small-diameter hole section of the tapered shank body 201. This allows the first spring 104 to apply an axial preload force to the tapered shank body 201 and the tip body 101, respectively, in a compressed state.

[0066] Furthermore, a sleeve 103 is provided corresponding to the first spring 104. The sleeve 103 is sleeved on the second tip section of the tip body 101. One end surface of the sleeve 103 can abut against the stepped surface of the tip body 101 and the tapered shank body 201, and the other end surface is connected to the first spring 104. The outer peripheral wall surface of the sleeve 103 does not fit the inner peripheral wall surface of the tapered shank body 201, and a certain space is left, so that it can move with the compression / extension of the first spring 104. Further preferably, the end of the sleeve 103 connected to the first spring 104 is provided with an annular notch, and the first spring 104 is connected to the end surface of the notch. The two sleeves 103 respectively provided at both ends of the first spring 104 are arranged opposite to each other according to the notch. The total axial length of the notches of the two sleeves 103 is greater than the length of the first spring 104 when it is under extreme compression, and less than the length of the first spring 104 at normal times, so that the first spring 104 will not be squeezed to the limit state, thereby extending the service life of the first spring 104.

[0067] Furthermore, the second tip section is also provided with a corresponding first bearing 102, and a plurality of first bearings 102 are arranged axially spaced apart along the tip body 101, so that the tip body 101 can rotate relative to the tapered shank body 201. Further preferably, the bearing can be a thrust bearing or a sliding bearing.

[0068] In a preferred embodiment, the first spring 104 is correspondingly arranged between the two bearings, and the end face of the sleeve 103 away from the notch is in contact with the bearing. When there are multiple bearings, the first spring 104 can also be correspondingly arranged between two adjacent first bearings 102.

[0069] Furthermore, the outer periphery of the conical handle body 201 can be divided into a sealing section, a movable section and an outer conical section in sequence along the axial direction, and the outer end face of the sealing section is flush with the opening of the internal blind hole of its conical handle body 201, and the outer diameter of its sealing section is larger than the outer diameter of the movable section. Correspondingly, its jacket 3 is provided with a stepped hole in the axial direction, and the inner peripheral wall surface of the large-diameter hole section inside the jacket 3 is fitted with the outer peripheral wall surface of the sealing section of the conical handle body 201, and the inner peripheral wall surface of the small-diameter hole section of the jacket 3 is fitted with the outer peripheral wall surface of the movable section, and the inner peripheral walls of the two sections of the jacket 3 are provided with annular sealing grooves for setting sealing parts to achieve sealing between the conical handle body 201 and the jacket 3 bracket.

[0070] In addition, the outer diameter of the outer tapered section of the taper shank body 201 is less than or equal to the outer diameter of the movable section, so that the outer tapered section can pass through the collet 3 during the installation of the taper shank assembly 2 and the collet 3 and be fixedly connected to the lathe tailstock 5. Further preferably, the outer tapered section of the taper shank body 201 is a Morse No. 5 taper shank.

[0071] Furthermore, a second elastic member is provided between the tapered shank body 201 and the jacket 3. The second elastic member provides an axial preload force to the tapered shank body 201 and the jacket 3, respectively. When the relative position of the tapered shank body 201 is determined, an axial preload force is applied to the jacket 3, thereby driving the top ring 4 to tighten the workpiece 6. Further preferably, the second elastic member is a second spring 204, which is sleeved around the outer periphery of the movable section of the tapered shank body 201. The second spring 204 is in contact with the end face of the sealing section of the tapered shank body 201 and the end face of the small-diameter hole section of the jacket 3, respectively.

[0072] Furthermore, at least one second bearing 203 is sleeved on the movable section of the tapered shank assembly 2 to achieve relative rotation between the jacket 3 and the tapered shank body 201 .

[0073] In a preferred embodiment, the second bearings 203 are arranged in two axially spaced intervals, and the two second bearings 203 are respectively in contact with the two ends of the second spring 204, and a washer 205 is provided between the second bearings 203 and the second spring 204. The washer 205 is an annular member, which is sleeved on the outer periphery of the movable section of the tapered shank body 201. Its outer circle is lower than the outer circle of the bearing, so that its outer circle does not fit the inner circumferential wall surface of the jacket 3. The washer 205 is made of elastic rubber. Further explanation: the washer 205 uniformly applies the axial preload force applied by the second spring 204 to the bearing. Correspondingly, the sleeve 103 can also achieve the same effect, and the washer 205 can also be replaced with the sleeve 103.

[0074] Furthermore, a limiting member 202 is provided on the outer end surface of the sealing section of the tapered handle body 201 for limiting the position of the tip body 101. Further preferably, the tapered handle body 201 and the limiting member 202 are connected by threads.

[0075] In a preferred embodiment, the limiting member 202 is an annular structure, the outer circle of which is smaller than the inner circumferential wall of the large diameter hole section of the jacket 3, so that it will not hinder the relative movement of the jacket 3 and the tapered shank body 201 in the axial direction. A through hole is provided in the middle of the annular member, and the inner diameter of the through hole is smaller than the outer diameter of the cylindrical portion of the top body 101, allowing only the tip of the top body 101 to pass through, thereby achieving a limiting effect on the top body 101, so that the axial relative movement between the top body 101 and the tapered shank body 201 is carried out within a certain range. Further preferably, the end of the cylindrical portion near the tip is provided with an annular notch, and the end face of the annular member opposite to the tapered shank assembly 2 abuts against the notch to limit the position of the top body 101.

[0076] In actual application, it is necessary to oil the springs and bearings to make their movement smoother, so as to achieve a quick response to changes in the slender shaft. After the assembly of the pulling device is completed, the space between the top body 101 and the tapered handle body 201, and the tapered handle body 201 and the jacket 3 is isolated from the outside world by a seal, making it impossible to oil it during actual use.

[0077] In a preferred embodiment, an oil filling hole 301 is provided on the side wall of the jacket 3, connecting the annular space where the second spring 204 is located to the outside world so that lubricant can be injected therefrom. Correspondingly, a through hole is provided on the side wall of the movable section of the tapered handle body 201, penetrating the inner and outer walls thereof, so that the space where the first spring 104 is located is also filled with lubricant. This ensures that all components of the jacking and pulling device are soaked with lubricant for lubrication during operation. Further preferably, the lubricant is butter or low-temperature grease.

[0078] Furthermore, when the workpiece 6 is heated and deformed, its first spring 104 and second spring 204 will expand and contract accordingly, causing the volume of the space they occupy to change. The lubricating oil contained in this space needs to flow out through a corresponding channel. To this end, the tip body 101 has an internal accommodating cavity that communicates with the accommodating space where the first spring 104 resides, allowing lubricating oil to enter the accommodating cavity. Furthermore, an oil outlet hole is provided at the opening at the tip of the tip body 101. This oil outlet hole is arranged axially to connect the accommodating cavity with the outside world, allowing lubricating oil to flow out through the accommodating cavity and the oil outlet hole when the volume changes.

[0079] In a preferred embodiment of the present application, the accommodating cavity is a blind hole opened at one end of the top body 101 away from the tip, and the second top segment of the cylindrical portion of the top body 101 can be extended into the small-diameter hole segment of the stepped hole of the tapered shank body 201, and a certain gap is left between the outer peripheral wall surface of the second top segment and the inner peripheral wall surface of the small-diameter hole segment, so that the lubricating oil between the top body 101 and the tapered shank body 201 can enter the blind hole (i.e., the accommodating cavity) of the top body 101 through the gap.

[0080] In another preferred embodiment, a through hole is provided on the side wall of the second tip section in the tip body 101, which passes through the inner and outer walls of the tip body 101, so that oil can enter the accommodating cavity through the through hole and flow out from the oil outlet.

[0081] like Figure 4 、 5 As shown in , further, the sleeve 3 is correspondingly connected to the top ring 4, so that the preload force on the sleeve 3 is transmitted to the top ring 4, and the top ring 4 is fixedly connected to the workpiece 6, so that the top ring 4 applies an axial tensioning force to the workpiece 6.

[0082] In a preferred embodiment of the present application, the jacket 3 and the top ring 4 are threadedly matched. The internal through hole of the jacket 3 is a stepped hole and is divided into three sections. The section away from the small-diameter hole section is a connecting section, and the inner circumferential wall of the connecting section is provided with threads and a tool-relief groove. Correspondingly, the outer circumference of the top ring 4 is a correspondingly arranged step structure, and the outer circumference of the small-diameter section is provided with an external thread structure that matches the internal thread of the jacket 3. The thread matching allows the jacket 3 and the top ring 4 to achieve relative axial displacement by mutual rotation. The outer circumferential wall of the top ring 4 is provided with a plurality of fixing holes 401 arranged at intervals along the circumference. Bolts are passed through these fixing holes 401 to fasten the workpiece 6 to the top ring 4.

[0083] Furthermore, the jacket 3 and the top ring 4 are tightened to strengthen the fixation therebetween, and a tightening hole 302 is provided on the side wall surface of the connecting section of the jacket 3, so that a tightening screw passes through the tightening hole 302 and is threadedly connected to the tightening hole 302, and the end of the tightening screw presses against the side wall surface of the top ring 4 to prevent the thread matching between the jacket 3 and the top ring 4 from loosening.

[0084] Furthermore, the taper shank assembly 2 further includes a fixing block 206 disposed at the end of the outer conical section of the taper shank body 201. The fixing block 206 can be divided into a taper shank connecting portion and a tailstock 5 connecting portion. A threaded hole is provided on the end surface of the outer conical section of the taper shank body 201. The corresponding taper shank connecting portion is an external threaded structure and is connected to the external threaded structure, so that the taper shank body 201 is fixedly connected to the fixing block 206. The tailstock 5 connecting portion has threaded holes extending through both end surfaces thereof. By extending into the interior of the tailstock 5, aligning with the internal threaded holes of the tailstock 5, and installing anti-rotation screws, the tailstock 5 connecting portion is fixedly connected to the tailstock 5, thereby achieving a fixed connection between the taper shank assembly 2 and the tailstock 5.

[0085] Furthermore, the present invention also discloses a method for using the elastic lifting device, comprising the following steps:

[0086] S1, assemble top component 1,

[0087] A first bearing 102 and a sleeve 103 are sequentially sleeved axially on the second tip section on the outer periphery of the tip body 101, and the first spring 104 is installed and sleeved on the outer periphery of the sleeve 103 so as to abut against the notched end surface thereof. Then another sleeve 103 and another first bearing 102 are sequentially sleeved;

[0088] S2, assemble the taper handle assembly 2,

[0089] The second bearing 203, the washer 205 and the second spring 204 are sequentially sleeved on the movable section of the tapered handle body 201 along the axial direction. The specific installation process is the same as the installation process of the top assembly 1 and will not be repeated here.

[0090] Then screw the thread of the fixing block 206 into the screw hole on the end face of the outer cone section of the tapered handle body 201, and fix the fixing block 206 to the end of the outer cone section of the tapered handle body 201;

[0091] S3, put the jacket 3 on the taper handle assembly 2,

[0092] Install sealing rings at two sealing grooves on the inner wall of the jacket 3, and put the jacket 3 on the tapered shank assembly 2 until the bearing on the tapered shank assembly 2 contacts the stepped end surface of the inner hole of the jacket 3;

[0093] S4, connect the top assembly 1 and the taper shank assembly 2,

[0094] Install a sealing ring in the sealing groove of the inner hole of the tapered shank, insert the top assembly 1 into the blind hole of the tapered shank assembly 2, and the first bearing 102 on the top assembly 1 contacts the stepped end face of the stepped hole inside the tapered shank body 201. At this time, the tip of the top body 101 protrudes from the end face of the tapered shank body 201;

[0095] Install the limiting member 202 and place it on the tip of the top body 101. While exposing the tip of the top body 101, press the cylindrical portion of the top body 101 into the tapered shank body 201. The first spring 104 on the top assembly 1 is compressed until the limiting member 202 contacts the end face of the sealing section of the tapered shank body 201. Install the screws and install the limiting member 202 on the end face of the tapered shank body 201.

[0096] S5, fix the taper handle body 201,

[0097] Insert the outer conical section of the taper shank body 201 into the tailstock 5 of the lathe, and insert the fixing block 206 into the tailstock 5. The screw holes on the fixing block 206 are aligned with the screw holes on the tailstock 5, and corresponding fastening screws are provided to achieve a reliable connection between the taper shank assembly 2 and the tailstock 5 to prevent separation or relative rotation.

[0098] S6. Install the top ring 4.

[0099] The top ring 4 is sleeved on the tail end of the workpiece 6 and is threadedly connected to the jacket 3. The top ring 4 is fixed to the workpiece 6 by bolts, thereby fixing one end of the workpiece 6 by the elastic pulling device.

[0100] Furthermore, the installation process of the top ring 4 also includes adjusting the top tightening force and the tensioning force.

[0101] The process of adjusting the pressing force is to adjust the axial position of the tailstock 5 until the tip of the top body 101 presses against the workpiece 6, and the compression amount of the first spring 102 can be appropriately adjusted, and the compression amount is between 1 and 5 mm;

[0102] The tension adjustment process includes the following steps:

[0103] Use the wrench position on the jacket 3 to rotate the jacket 3, so that the internal thread of the jacket 3 engages with the external thread of the top ring 4, and rotate them relative to each other for 2 to 3 turns;

[0104] Continue rotating the collet 3, moving it toward the workpiece 6. The taper shank assembly 2 and the center assembly 1 are now fixed, and the second spring 204 on the taper shank assembly 2 is compressed, causing the jackscrew on the top ring 4 to generate an axial tension on the workpiece 6. This tension is balanced by the spring force. In actual operation, the compression of the second spring 204 on the outer ring of the taper shank can be changed by adjusting the axial position of the tailstock 5 (including the center assembly 1, the taper shank assembly 2, and the collet 3), thereby adjusting the tension on the workpiece 6.

[0105] In one embodiment of the present application, taking the processing of a titanium alloy slender shaft as an example, the workpiece 6 has a length of 4000 mm and an outer diameter of The required tightening force for turning the outer circle is about 100N. During the machining process, the temperature of the workpiece 6 rises by 30°C due to the influence of cutting heat. According to the formula for thermal deformation elongation, the elongation of the workpiece 6 is calculated to be about 1.2mm. The formula is as follows:

[0106] ΔL=α l × L × Δt = 10 × 10 -6 ×4×10 3 ×30=1.2mm

[0107] Furthermore, during the actual turning process, one end of the slender shaft is fixedly connected to the lathe rotating shaft, and the other end is fixed to the device. During the turning process, the rotating shaft rotates at a speed of 0 to 150 rpm. Correspondingly, the relative positions of the top ring 4 and the sleeve 3 and the workpiece 6 remain consistent, and under the action of the second bearing 203, they also rotate relative to the tapered shank body 201.

[0108] During actual operation, the length of the slender shaft changes due to heat, causing it to extend overall. Accordingly, the top ring 4 applies an axial tensioning force to one end of the slender shaft, keeping it in a constant tensioned state. This reduces vibration during turning. Furthermore, when the end of the slender shaft that connects to the jacking and pulling device elongates, the tip body 101 contracts accordingly, compensating for the deformation of the workpiece 6. This ensures that the tip of the tip body 101 always presses against the end face of the slender shaft, thereby securing the slender shaft. When the workpiece 6 returns to room temperature, the tip body 101 moves accordingly, and the preload force decreases as the spring extends, returning to its initial tensioned state.

[0109] The elastic pulling and jacking device of the present invention and its use method include a tapered shank assembly, a center assembly, a sleeve and a top ring, wherein the tapered shank body in the tapered shank assembly is fixed, and an axial pre-tightening force is applied to the center body and the sleeve respectively by a first elastic member and a second elastic member respectively arranged on the inner and outer wall surfaces of the tapered shank body, so that the workpiece is always subjected to the tensioning force from the top ring and the pushing force from the center body, thereby achieving the fixation of the workpiece and reducing the vibration of the workpiece during the turning process, thereby effectively improving the turning processing quality and efficiency.

[0110] It will be easily understood by those skilled in the art that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An elastic jacking device, comprising a top body and a tapered handle body for mounting the top body, characterized in that: One end of the tapered shank body is provided with a blind hole for mounting the top body, and one end thereof is provided with a fixing block for fixed connection with the tailstock of the lathe. The top body is divided into a tip portion and a barrel portion along the axial direction, and A first elastic member is provided between the tapered shank body and the top body, for applying a pre-tightening force to the top body so that the top body presses against a workpiece; and Also includes a collet and a top ring for fixing the workpiece. The collet is sleeved on the outer periphery of the taper shank body and is correspondingly connected to the top ring, so that the workpiece is supported against the top body to fix the end of the workpiece, and A second elastic member is further provided between the tapered shank body and the chuck, and a pre-tightening force is applied to the chuck in the axial direction by the second elastic member, so that the top ring applies a tensioning force to the workpiece; The outer periphery of the cone handle body is divided into a sealing section, a movable section and an outer cone section in the axial direction, wherein the outer diameter of the sealing section is larger than the outer diameter of the movable section, and The interior of the jacket is a stepped hole structure, the inner peripheral wall of the large diameter hole section fits with the outer peripheral wall of the sealing section, and the inner peripheral wall of the small diameter hole section fits with the outer peripheral wall of the movable section, and The second elastic member is sleeved on the outer circumference of the movable section, one end of the second elastic member is connected to the end surface of the sealing section, and the other end of the second elastic member is connected to the end surface of the small-diameter hole section of the jacket.

2. The elastic pulling device according to claim 1, wherein: The blind hole on the tapered handle body is a stepped hole, and The outer periphery of the cylinder is a stepped structure. The first elastic member is sleeved on the top body, with one end thereof connected to the step end surface on the top body and the other end thereof connected to the step end surface on the stepped hole.

3. The elastic pulling device according to claim 2, wherein: The outer periphery of the top body is provided with a plurality of sleeves at intervals along the axial direction, and one end of the sleeve is provided with a notch, and The two ends of the first elastic member are respectively connected to the end surfaces of the two sleeve notches, and the other end of the sleeve can be in contact with the step end of the top body and / or the tapered shank body.

4. The elastic pulling device according to claim 1, wherein: The elastic pulling device also includes a bearing assembly, which includes a first bearing sleeved on the top body and a second bearing sleeved on the movable section of the tapered shank body, and the bearings are multiple and spaced apart along the axial direction, so that the sleeve and the top body can rotate relative to the tapered shank body.

5. The elastic pulling device according to claim 1, wherein: The side wall of the jacket is also provided with an oil filling hole, and the side wall of the movable section of the taper handle body is also provided with a through hole penetrating the inner and outer walls thereof, so that the annular space where the first elastic member and the second elastic member are located can be filled with lubricating oil, and The interior of the tip body is provided with a receiving cavity which is in communication with the annular space where the first elastic member is located, and the tip is provided with an oil outlet which is in communication with the outside and the receiving cavity, so that gas and / or lubricating oil can flow out.

6. The elastic pulling device according to claim 1, wherein: A limiting member is also provided on the end face of the sealing section of the tapered handle body, and a through hole is opened in the middle of the limiting member. The inner diameter of the through hole is smaller than the outer diameter of the cylindrical portion of the top body and larger than the outer diameter of the tip, so that the tip of the top body passes through the through hole and limits the cylindrical portion.

7. The elastic pulling device according to claim 1, wherein: The top ring is matched with the sleeve thread, so that the sleeve can adjust the relative position of the top ring and the sleeve in the axial direction by rotation, and A tightening screw is further provided between the jacket and the top ring to strengthen the connection between the two.

8. A method for using an elastic push-pull device, which is implemented based on the elastic push-pull device according to any one of claims 1 to 7, characterized in that: The steps include: S1, assemble top components, One of the first bearings and a sleeve is sequentially sleeved on the second tip section of the tip body along the axial direction, and the first elastic member is sleeved on the outer circumference of the sleeve and abutted against the end face of the notch, and then another sleeve and another first bearing are sequentially sleeved; S2, assemble the taper handle assembly, The second bearing, washer and second elastic member are sleeved on the movable section of the tapered handle body, and the installation process is the same as that in step S1; A fixing block is installed at the end of the outer cone section of the cone handle body; S3, putting the collet on the taper handle assembly, Install sealing rings at two sealing grooves on the inner peripheral wall of the jacket, and sleeve the jacket onto the tapered shank assembly until the bearing on the tapered shank assembly contacts the stepped end surface of the jacket inner hole; S4. Connect the top assembly and the taper shank assembly. Install the tip assembly into the blind hole of the tapered shank assembly, so that the first bearing on the tip assembly contacts the stepped end surface of the stepped hole inside the tapered shank body, and the tip of the tip body protrudes from the end surface of the tapered shank body; Install the limiting piece, and while the tip of the top body is exposed, press the cylindrical portion of the top body into the tapered shank body, so that the first elastic piece on the top assembly is compressed until the limiting piece contacts the end surface of the sealing section of the tapered shank body, and the two are fixedly connected; S5, fixed taper handle body, Insert the outer cone section of the taper shank body into the tailstock of the lathe, and insert the fixing block into the tailstock. Align the screw holes on the fixing block with the screw holes on the tailstock, and set the fastening screws accordingly to achieve a reliable connection between the taper shank assembly and the tailstock. S6. Install the top ring. The top ring is set on the tail end of the workpiece and matched with the thread between the sleeve, the top ring is fixedly connected to the workpiece, and the top ring and the sleeve are fixedly connected by bolts, so as to realize the fixation of one end of the workpiece by the elastic pulling device.

9. The method for using the elastic pulling device according to claim 8, wherein: The installation process of the top ring also includes the adjustment of the top force and the tension force: The adjustment of the pressing force includes adjusting the axial position of the tailstock so that the tip of the top body presses against the workpiece, and adjusting the compression amount of the first elastic member to achieve the adjustment of the pressing force on the workpiece; The adjustment of the tensioning force includes: after the top ring is fixed to the workpiece, the top ring is matched with the sleeve thread, the sleeve is rotated relative to the tapered handle body to adjust the axial relative position between it and the top ring, and by adjusting the compression amount of the second elastic member to adjust the pre-tightening force of the second elastic member on the sleeve, and then the sleeve is fixedly connected to the top ring, and the pre-tightening force applied to the sleeve by the second elastic member is transmitted to the top ring and finally converted into a tensioning force on the workpiece.

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