Lathe spindle with a positioning thread pin structure and method of assembly thereof

Abstract

The present application relates to a lathe spindle with a positioning threaded pin structure and an assembling method thereof, the lathe spindle comprising a spindle body and a spindle cone sleeve, the spindle body being a hollow shaft, the spindle cone sleeve extending into an inner cavity of the spindle body and slidingly fitting with an inner wall of the inner cavity; further comprising a positioning pin shaft, one end of the positioning pin shaft being provided with a positioning pin segment, a middle part being provided with a threaded segment, and the other end being provided with an adjusting segment; the diameter of the adjusting segment being smaller than the diameter of the threaded segment, the diameter of the positioning pin segment being greater than or equal to the diameter of the threaded segment, a screw hole being provided on the inner wall of the spindle body and being adapted to the threaded segment, the thread of the threaded segment being a reverse thread and the outward direction along the radius of the spindle body being a locking direction; an adjusting groove being provided on the end face of the adjusting segment, and an axial positioning groove being provided on the outer side wall of the spindle cone sleeve and being adapted to the positioning pin segment; the positioning pin shaft is assembled in the inner cavity and adjusted on the outer side of the spindle body, so that the positioning pin shaft can be well prevented from loosening due to vibration, and the positioning effect is better.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of machine tool processing, in particular to a lathe spindle with a positioning threaded pin structure and an assembling method thereof. BACKGROUND

[0002] The spindle is a key functional component in a live center lathe, and the shaft center in the spindle is a key part in the spindle component. The spindle taper sleeve can be positioned through the spindle shaft center, so that the angle accuracy of the part is ensured during rotation and stop of the spindle. However, the positioning of the spindle shaft center and the taper sleeve is achieved by a M5 hexagonal flat end locking screw (as shown in Figure 1 Although the spindle taper sleeve can rotate with the spindle shaft center, the locking screw is prone to loosening due to vibration after being tightened, and since the spindle taper sleeve is directly positioned by external threads, the angle positioning accuracy of the spindle taper sleeve is low, which causes relative movement in the circumferential direction during processing of parts with angle requirements, resulting in inaccurate processing angle of the parts, large deviation, and failure to meet the requirements of mass processing of parts. SUMMARY

[0003] The present application aims to solve the above problems by providing a lathe spindle with a positioning threaded pin structure and an assembling method thereof.

[0004] To achieve the above requirements, the technical solution adopted by the present application to solve the technical problems is as follows:

[0005] A lathe spindle with a positioning threaded pin structure is provided, which comprises a spindle body and a spindle taper sleeve. The spindle body is a hollow shaft, and one end of the spindle taper sleeve extends into the inner cavity of the spindle body and is in sliding fit with the inner wall of the inner cavity. The lathe spindle further comprises a positioning pin shaft, one end of which is provided with a positioning pin segment, the middle part is provided with a threaded segment, and the other end is provided with an adjusting segment. The diameter of the adjusting segment is smaller than the diameter of the threaded segment, and the diameter of the positioning pin segment is greater than or equal to the diameter of the threaded segment. A screw hole adapted to the threaded segment is provided on the inner wall of the spindle body. The threads of the threaded segment are reverse threads and the locking direction is outward along the radius of the spindle body. An adjusting groove is provided on the end face of the adjusting segment, and a positioning groove adapted to the positioning pin segment is provided axially on the outer side wall of the spindle taper sleeve.

[0006] The lathe spindle with a positioning threaded pin structure comprises a positioning pin segment, a threaded segment and an adjusting segment. The positioning pin segment is a cylindrical structure with the same diameter as the threaded segment, the side surface of the positioning pin segment is a smooth arc surface, and the end face of the positioning pin segment is a smooth plane.

[0007] The lathe spindle with a positioning threaded pin structure of the present invention has a chamfer at the connection between the side wall and the end face of the positioning pin segment, and the chamfer is arranged around the side wall of the positioning pin segment.

[0008] The lathe spindle with a positioning threaded pin structure of the present invention has an annular groove between the positioning pin segment and the threaded segment, and the end face of the positioning pin segment adjacent to the annular groove is aligned with the side wall of the annular groove.

[0009] The lathe spindle with a positioning threaded pin structure of the present invention, wherein the vertical distance between the root and crest of the threaded segment is the same as the depth of the annular groove.

[0010] The lathe spindle with a positioning threaded pin structure of the present invention, wherein, when assembled, the end face of the positioning pin segment facing the threaded segment abuts against the inner sidewall of the spindle body, and a gap is provided between the end face of the positioning pin segment and the bottom surface of the positioning groove.

[0011] The lathe spindle with a positioning threaded pin structure according to the present invention, wherein the adjusting groove is a slotted groove and both ends of it penetrate through the side wall of the adjusting section.

[0012] The lathe spindle with a positioning threaded pin structure according to the present invention, wherein, when assembled in place, the adjusting section is located inside the threaded hole.

[0013] The lathe spindle with a positioning threaded pin structure of the present invention has two positioning grooves, which are respectively located at both ends of the same diameter of the spindle tapered sleeve.

[0014] In addition, a method for assembling a lathe spindle with a positioning threaded pin structure is also provided, the method comprising the following steps:

[0015] The positioning pin is inserted into the main shaft body;

[0016] Insert the adjusting section into the screw hole and initially screw the threaded section into the screw hole;

[0017] Use an adjustment tool to insert into the screw hole on the outside of the spindle body and align it with the adjustment groove;

[0018] The locating pin is rotated in the opposite direction and the threaded section is gradually screwed into the threaded hole. During the rotation, the locating pin section is always outside the threaded hole.

[0019] Align the locating groove on the spindle tapered sleeve axially with the locating pin segment and insert it into the spindle body. Once in place, rotate the adjusting section again to move the locating pin segment in the radial direction of the spindle body and into place.

[0020] The beneficial effects of this invention are as follows: By inserting the positioning pin into the inner cavity and assembling it into the screw hole in the reverse direction, and tightening it by turning the knob in the reverse direction on the outside of the spindle body using a tool, the special structure and assembly method of the positioning pin can completely avoid loosening of the positioning pin due to processing vibration. Even if the positioning pin loosens, it will not be able to loosen further once its positioning pin section abuts against the bottom surface of the positioning groove on the outer wall of the spindle tapered sleeve, thus achieving the purpose of self-locking. Moreover, the tight fit between the positioning pin section and the inner wall of the positioning groove can improve the positioning accuracy of the spindle tapered sleeve. Compared with the traditional method of using bolts to circumferentially position the spindle tapered sleeve, this invention has higher accuracy and better positioning effect. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the present invention will be further described below in conjunction with the accompanying drawings and embodiments. The drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort:

[0022] Figure 1 A schematic diagram of the existing technology.

[0023] Figure 2 This is a schematic diagram of the overall structure of the lathe spindle with the positioning threaded pin structure of the present invention.

[0024] Figure 3 yes Figure 2 AA sectional view.

[0025] Figure 4 yes Figure 3 A magnified view of the local structure.

[0026] Figure 5 yes Figure 2 BB cross-sectional view.

[0027] Figure 6 yes Figure 5 A magnified view of the local structure.

[0028] Figure 7 This is a flowchart of the assembly method steps for a lathe spindle with a positioning threaded pin structure according to the present invention. Detailed Implementation

[0029] The terms "first," "second," "third," and "fourth," etc., used in the specification, claims, and accompanying drawings of this invention are used to distinguish different objects, not to describe a specific order. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products, or apparatuses.

[0030] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of the invention. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0031] "Multiple" refers to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. The character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0032] Furthermore, the terms indicating orientation, such as "up," "down," "left," "right," "upper end," "lower end," and "longitudinal," are all based on the posture and position of the device or equipment described in this solution during normal use.

[0033] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, a clear and complete description will be provided below in conjunction with the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the protection scope of the present invention.

[0034] A preferred embodiment of the present invention includes a lathe spindle with a positioning threaded pin structure, such as... Figures 2-6As shown, the spindle includes a spindle body 10 and a spindle tapered sleeve 20. The spindle body 10 is a cylindrical hollow shaft. One end of the spindle tapered sleeve 20 extends into the inner cavity of the spindle body 10 and slides against the inner wall of the cavity. The spindle also includes a locating pin 30, one end of which has a locating pin section 301. The middle part of the locating pin 30 has a threaded section 302. The other end of the locating pin 30 has an adjusting section 303. The diameter of the locating pin section 301 is greater than or equal to the diameter of the threaded section 302, but it can also be smaller than the diameter of the threaded section 302. A threaded hole 101 adapted to the threaded section 302 is provided on the inner wall of the spindle body 10. The thread of the threaded section 302 is a reverse thread, and the locking direction is outward along the radius of the spindle body 10. The diameter of the adjusting section 303 is smaller than the diameter of the threaded section 302 so that the adjusting section 303 can be quickly inserted into the threaded hole 101. An adjustment groove 31 is provided on the end face of the adjustment section 303 to facilitate the use of adjustment tools. A positioning groove 201 adapted to the positioning pin section 301 is provided axially on the outer side wall of the spindle tapered sleeve 20. The end of the positioning groove 201 that extends out of the spindle body 10 away from the spindle tapered sleeve 20 passes through the end face of the spindle tapered sleeve 20 so that the spindle tapered sleeve 20 can be installed into the inner cavity of the spindle body 10.

[0035] This invention involves inserting the positioning pin 30 into the inner cavity and reversibly assembling it into the screw hole 101. Tightening is achieved by rotating a tool on the outside of the spindle body 10 in the opposite direction. The special structure and assembly method of the positioning pin 30 completely prevent loosening caused by machining vibrations. Even if the positioning pin 30 becomes loose, its segment abuts against the bottom surface of the positioning groove 201 on the outer wall of the spindle tapered sleeve 20, preventing further loosening and achieving self-locking. Furthermore, the tight fit between the positioning pin segment 301 and the inner wall of the positioning groove 201 improves the positioning accuracy of the spindle tapered sleeve 20. Compared to the traditional method of using bolts for circumferential positioning of the spindle tapered sleeve 20, this invention offers higher accuracy and better positioning. In addition, this assembly method prevents the positioning pin 30 from loosening or breaking and falling out of the screw hole 101, thus avoiding obstruction of the spindle's normal operation within the machine tool and reducing the risk of machine tool damage.

[0036] This solution ensures both the tightening method of the threads and the precision of the positioning pin, so that after it is installed on the spindle body, the clearance between it and the spindle tapered sleeve is small, which reduces the angular deviation between the spindle body and the spindle tapered sleeve when the spindle body rotates, and greatly improves the stability of the machined parts.

[0037] in,

[0038] The locating pin is made of 40Cr material and undergoes heat treatment to ensure its durability.

[0039] The locating pin is designed with a dedicated positioning position and a wrench position, making installation quick and convenient.

[0040] The front end of this positioning pin is specifically designed for positioning the spindle tapered sleeve structure. Through actual measurement, the positioning accuracy has been greatly improved from 0.3mm to 0.02mm.

[0041] The length of the front pin of the positioning pin is designed so that its position is restricted after the thread is tightened, eliminating the need to repeatedly measure the thread length and greatly facilitating the operation of assembly personnel.

[0042] This structure enables mass production of parts with angular requirements, ensuring high precision and stability, improving production efficiency, and reducing costs.

[0043] In this embodiment, the positioning pin section 301 is a cylindrical structure with the same diameter as the threaded section 302. The side surface of the positioning pin section 301 is a smooth arc surface, and the end face of the positioning pin section 301 is a smooth plane, so as to reduce friction and reduce the amount of contact deformation.

[0044] In this embodiment, a chamfer 32 is provided at the connection between the side wall and the end face of the positioning pin segment 301. The chamfer 32 is arranged around the side wall of the positioning pin segment 301 to avoid severe wear with the bottom or side surface of the positioning groove 201.

[0045] In this embodiment, an annular groove 33 is provided between the locating pin segment 301 and the threaded segment 302. The end face of the locating pin segment 301 adjacent to the annular groove 33 is aligned with the sidewall of the annular groove 33. The vertical distance between the root and crest of the threaded segment 302 is the same as the depth of the annular groove 33. The annular groove serves two purposes: firstly, it forms a relief groove to prevent mismatched thread tails from appearing during the machining of the threaded segment 302; secondly, it allows the end face of the locating pin segment 301 facing the threaded segment 302 to abut against the inner sidewall of the spindle body 10 when assembled, thereby limiting the stroke of the threaded segment 302 along the radial direction of the spindle body 10, ensuring that the overlap length between the locating pin segment 301 and the spindle tapered sleeve 20 meets the requirements, and guaranteeing the strength against shear forces. A gap 40 is provided between the end face of the locating pin segment 301 and the bottom surface of the locating groove 201.

[0046] In this embodiment, the adjustment groove 31 is a slotted groove with both ends penetrating the sidewall of the adjustment section 303. When assembled, the adjustment section 303 is located inside the screw hole 101, ensuring that tools such as flathead screwdrivers are always aligned with the adjustment groove 31 during adjustment and rotation, preventing loosening. In addition, it also serves to conceal the adjustment section 303, preventing it from protruding beyond the outside of the spindle body 10.

[0047] In this embodiment, there are two positioning slots, which are located at both ends of the same diameter of the spindle tapered sleeve 20.

[0048] The preferred embodiment of the present invention describes the assembly method of a lathe spindle with a positioning threaded pin structure, such as... Figure 7 As shown, the method includes the following steps:

[0049] Step S10: The positioning pin 30 is fed into the spindle body 10;

[0050] Step S20: Insert the adjusting section 303 into the screw hole 101 and initially screw the threaded section 302 into the screw hole 101;

[0051] Step S30: Use an adjustment tool to insert into the screw hole 101 on the outside of the spindle body 10 and align with the adjustment groove 31;

[0052] Step S40: Rotate the positioning pin 30 in the opposite direction and gradually screw the threaded section 302 into the screw hole 101. During the rotation, the positioning pin section 301 is always outside the screw hole 101.

[0053] Step S50: Align the positioning groove 201 on the spindle taper sleeve 20 axially with the positioning pin section 301 and insert it into the spindle body 10. After it is in place, rotate the adjusting section 303 again to move the positioning pin section 301 in the radial direction of the spindle body 10 and into place.

[0054] It should be understood that those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims.

Claims

1. A lathe spindle with a positioning threaded pin structure, characterized in that, The device includes a spindle body and a spindle tapered sleeve. The spindle body is a hollow shaft, and one end of the spindle tapered sleeve extends into the inner cavity of the spindle body and slides against the inner wall of the cavity. It also includes a locating pin, with a locating pin section at one end, a threaded section in the middle, and an adjusting section at the other end. The diameter of the adjusting section is smaller than the diameter of the threaded section, and the diameter of the locating pin section is greater than or equal to the diameter of the threaded section. A threaded hole adapted to the threaded section is provided on the inner wall of the spindle body. The thread of the threaded section is a reverse thread, and the locking direction is outward from the radius of the spindle body. An adjusting groove is provided on the end face of the adjusting section, and a locating groove adapted to the locating pin section is provided axially on the outer wall of the spindle tapered sleeve.

2. The lathe spindle with a positioning threaded pin structure according to claim 1, characterized in that, The positioning pin segment is a cylindrical structure with the same diameter as the threaded segment. The side of the positioning pin segment is a smooth arc surface, and the end face of the positioning pin segment is a smooth plane.

3. The lathe spindle with a positioning threaded pin structure according to claim 2, characterized in that, The connection between the side wall and the end face of the positioning pin segment is provided with a chamfer, and the chamfer is arranged around the side wall of the positioning pin segment.

4. The lathe spindle with a positioning threaded pin structure according to claim 1, characterized in that, An annular groove is provided between the locating pin segment and the threaded segment, and the end face of the locating pin segment adjacent to the annular groove is aligned with the side wall of the annular groove.

5. The lathe spindle with a positioning threaded pin structure according to claim 4, characterized in that, The vertical distance between the root and crest of the threaded section is the same as the depth of the annular groove.

6. The lathe spindle with a positioning threaded pin structure according to claim 5, characterized in that, When assembled, the end face of the locating pin section facing the threaded section abuts against the inner wall of the spindle body, and there is a gap between the end face of the locating pin section and the bottom surface of the locating groove.

7. The lathe spindle with a positioning threaded pin structure according to claim 1, characterized in that, The adjustment groove is a straight groove with both ends penetrating the sidewall of the adjustment section.

8. The lathe spindle with a positioning threaded pin structure according to claim 7, characterized in that, When assembled, the adjustment section is located inside the screw hole.

9. The lathe spindle with a positioning threaded pin structure according to claim 1, characterized in that, The positioning groove is provided in two places, and is located at both ends of the same diameter of the main shaft tapered sleeve.

10. A method for assembling a lathe spindle with a locating threaded pin structure, the lathe spindle with a locating threaded pin structure according to any one of claims 1-9, characterized in that, The method includes the following steps: The positioning pin is inserted into the main shaft body; Insert the adjusting section into the screw hole and initially screw the threaded section into the screw hole; Use an adjustment tool to insert into the screw hole on the outside of the spindle body and align it with the adjustment groove; The locating pin is rotated in the opposite direction and the threaded section is gradually screwed into the threaded hole. During the rotation, the locating pin section is always outside the threaded hole. Align the locating groove on the spindle tapered sleeve axially with the locating pin segment and insert it into the spindle body. Once in place, rotate the adjusting section again to move the locating pin segment in the radial direction of the spindle body and into place.

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