A kind of boring machine spindle and processing method thereof

Abstract

The present invention relates to the technical field of intelligent boring machines, and in particular to a boring machine spindle and a processing method thereof, comprising: a sleeve is provided with a hollow area extending from a left end face along an axis to a right end face; a long groove is provided in the sleeve; a positioning groove is provided in the hollow area, the positioning groove is close to the left end of the long groove, and the left end of the positioning groove forms a certain distance with the left end of the long groove; a support shaft is provided in the hollow area, coaxial with the sleeve, and the support shaft has a through area extending from one end face along the axis to the other end face; the support shaft is fitted; the left end of the support shaft is fixedly connected to the left end of the sleeve; a core shaft is provided in the through area, coaxial with the sleeve; a limit ring is provided on the core shaft, and the limit block is provided on the limit ring; a guide groove is provided on the core shaft; the guide groove is provided with a first oblique section and a first straight section; a force transmission assembly is coaxial with the sleeve, and comprises a left bearing, a right bearing and a force transmission ring; the force transmission ring is located between the two bearings; the force transmission ring is provided with a force transmission block; a guide column is provided on the inner wall of the force transmission ring; a disc spring assembly is sleeved on the core shaft; the present invention effectively improves the precision of the boring machine spindle.

Description

Technical Field

[0001] The invention relates to the technical field of intelligent boring machines, and in particular to a boring machine spindle and a processing method thereof. Background Art

[0002] The boring machine spindle is a key component in the field of mechanical manufacturing, mainly used for precision hole processing; it is usually composed of multiple parts, including sleeves, mandrels, etc., and achieves high-precision control and stable performance through complex structural design.

[0003] However, the existing boring machine spindles still have some shortcomings in practical applications. For example, in actual operation, the spindle needs to be able to stably extend a certain length in order to perform precise hole processing; but under the influence of gravity, the free end of the spindle will sag to a certain extent after being extended. If the spindle sags too much, it will lead to a decrease in processing accuracy and even affect the quality of the product.

[0004] Therefore, how to improve the overall rigidity of the boring machine spindle has become a technical problem that needs to be solved; in response to this problem, the present invention proposes a boring machine spindle and a processing method thereof, aiming to improve the defects existing in the prior art and improve the accuracy of the boring machine spindle. Summary of the invention

[0005] In view of at least one of the above technical problems, the present invention provides a boring machine spindle and a processing method thereof, which improves the processing accuracy by reducing the sagging amount of the free end of the spindle after it is extended.

[0006] According to a first aspect of the present invention, there is provided a boring machine spindle, comprising:

[0007] The sleeve has one end as the left end and the other end as the right end. The sleeve is provided with a hollow area extending from the left end surface to the right end surface along the axis. The inner wall of the sleeve is provided with six long grooves distributed along the circumference of the axis from the right end to the left end. The hollow area is also provided with six positioning grooves distributed along the circumference of the axis. The positioning groove is close to the left end of the long groove, and the left end of the positioning groove forms a certain distance with the left end of the long groove.

[0008] The support shaft is arranged in the hollow area and is coaxial with the sleeve. The support shaft is provided with a through area extending from one end surface along the axis to the other end surface. The outer wall shape of the support shaft fits the inner wall shape of the sleeve. The left end of the support shaft is fixedly connected to the left end of the sleeve. The left end of the support shaft has a space for accommodating a clamped workpiece.

[0009] The mandrel is arranged in the through area and is coaxial with the sleeve; the mandrel is provided with a limit ring, and the limit ring is provided with six limit blocks extending into the six long grooves; a plurality of guide grooves distributed along the circumference of the axis are opened on the outer side of the mandrel; the guide groove is provided with a first oblique section and a first straight section in sequence from left to right, the first oblique section forms an angle with the axis of the mandrel, and the first straight section is parallel to the axis of the mandrel;

[0010] The force transmission assembly includes a left bearing, a right bearing and a force transmission ring which are coaxial with the sleeve; the force transmission ring is located between the left bearing and the right bearing; the left end surface of the left bearing is in contact with the right end surface of the support shaft; the force transmission ring is provided with six force transmission blocks; the inner wall of the force transmission ring is provided with a guide column which extends into the guide groove;

[0011] The disc spring assembly is sleeved on the core shaft and is located between the force transmission assembly and the limit ring;

[0012] During processing, the mandrel is located at the rightmost end, and the force transmission block and the long groove are aligned in the direction of the mandrel axis;

[0013] When changing the tool, the mandrel is located at the far left end and the force transmission block enters the positioning groove.

[0014] Furthermore, a fixing ring is arranged on the left section of the supporting shaft, and the right end surface of the fixing ring fits the left end surface of the sleeve; the fixing ring is fixedly connected to the sleeve.

[0015] Furthermore, the core shaft is composed of multiple short shafts; an external thread is provided at one end of each short shaft, and an internal thread is provided at the other end; and multiple short shafts are connected end to end to form the core shaft.

[0016] Furthermore, it also includes a supporting piston, which is arranged at one end of the short shaft with an external thread and is used to support the core shaft in the supporting shaft.

[0017] Furthermore, the core shaft is provided with a transition zone, and the diameter of the transition zone gradually increases from left to right; the transition zone and the limiting ring are on the same short axis and constitute the rightmost section of the core shaft.

[0018] Furthermore, the guide groove also includes a second straight section and a second oblique section; the second straight section connects the first oblique section and the second oblique section; the second oblique section forms an angle with the axis of the core shaft, and the second straight section is parallel to the axis of the core shaft; the guide groove does not exceed the transition zone.

[0019] Furthermore, a first slot is provided on the right end face of the support shaft, and the outline of the first slot corresponds to the outer wall shape of the left bearing; a second slot is provided on the left end face of the force transmission ring, and the outline of the second slot corresponds to the outer wall shape of the left bearing; a third slot is provided on the right end face of the force transmission ring, and the outline of the third slot corresponds to the outer wall shape of the right bearing.

[0020] Furthermore, the force transmission block is provided with an oil groove which is in a curved shape.

[0021] Furthermore, starting from the left end face of the left bearing, passing through the force transmission ring, the right bearing, the disc spring assembly, and ending at the right end face of the limit ring, the total length in the axial length direction is less than the length of the long slot.

[0022] According to a second aspect of the present invention, there is also provided a method for machining a spindle of a boring machine, comprising the following steps:

[0023] S10: Install the left bearing of the force transmission assembly on the support shaft, and then install the support shaft into the sleeve from the left end of the sleeve;

[0024] S20: Install the force transmission ring of the force transmission assembly into the sleeve from the right end of the sleeve, and after it abuts against the left bearing, rotate the force transmission ring at an angle so that the force transmission block extends into the positioning groove;

[0025] S30: Combine multiple short shafts into a core shaft, and put the disc spring assembly and the right bearing on the core shaft; then install the core shaft into the sleeve from the right end of the sleeve; when the core shaft moves to the left, the guide column of the force transfer ring will enter the guide groove; when the core shaft is installed in place, the guide column stops at the right end of the second straight section of the guide groove, and the force transfer ring is rotated back to the state where the force transfer block and the long groove are aligned in the direction of the core shaft axis; at this time, the processing of the boring machine spindle is completed.

[0026] The beneficial effects of the present invention are as follows: when changing the tool, the force brought by the extension of the core shaft to the main shaft of the boring machine drives the force transmission block to enter the positioning groove through the rotation of the force transmission ring, so that the force is transmitted to the sleeve, thereby improving the stability of the core shaft; through the disc spring assembly in a compressed state, a thrust is applied to the left and right ends of the sleeve respectively, so that the main shaft of the boring machine is supported by the thrust, thereby reducing the droop of the main shaft, thereby achieving the effect of improving the processing accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 Schematic diagram of the appearance of a boring machine spindle in an embodiment of the present invention;

[0029] Figure 2 It is a cross-sectional view of a sleeve in a main shaft of a boring machine in an embodiment of the present invention;

[0030] Figure 3 It is a schematic structural diagram of a support shaft in a boring machine spindle in an embodiment of the present invention;

[0031] Figure 4Schematic diagram of the structure of the central spindle of the boring machine spindle in an embodiment of the present invention;

[0032] Figure 5 In the embodiment of the present invention Figure 4 A schematic diagram of the enlarged structure at point A;

[0033] Figure 6 In the embodiment of the present invention Figure 4 A schematic diagram of the enlarged structure at B;

[0034] Figure 7 Schematic diagram of the structure of a force transmission component in a boring machine spindle in an embodiment of the present invention;

[0035] Figure 8 It is a left side schematic diagram of a force transmission component in a boring machine spindle in an embodiment of the present invention;

[0036] Fig. 9 It is a sequential schematic diagram of the short axis at the rightmost end of the spindle of the boring machine spindle in an embodiment of the present invention;

[0037] Fig.10 It is a cross-sectional view of a long groove of a sleeve in a main shaft of a boring machine in an embodiment of the present invention;

[0038] Fig.11 1 is a step diagram of a boring machine spindle processing method in an embodiment of the present invention.

[0039] Figure numerals: 1. sleeve; 11. hollow area; 12. long groove; 13. positioning groove; 2. support shaft; 21. fixing ring; 22. first slot; 3. core shaft; 31. limiting ring; 31a. limiting block; 32. guide groove; 32a. first oblique section; 32b. first straight section; 32c. second oblique section; 32d. second straight section; 33. short shaft; 33a. external thread; 33b. internal thread; 34. transition zone; 4. force transmission assembly; 41. left bearing; 42. right bearing; 43. force transmission ring; 43a. force transmission block; 43a1. oil groove; 43b. guide column; 5. disc spring assembly; 6. support piston. DETAILED DESCRIPTION

[0040] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0041] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0042] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0043] like Figures 1 to 10 The boring machine spindle shown includes:

[0044] like Figure 1 As shown, the sleeve 1 has one end as the left end and the other end as the right end. In the present invention, the left end and the right end of the sleeve 1 are used as the left end and the right end of the main shaft of the boring machine, and the left end and the right end of other components mentioned below are unified with the left end and the right end of the sleeve 1 in direction;

[0045] like Figure 2 and Fig.10 As shown, the sleeve 1 is provided with a hollow area 11 extending from the left end surface to the right end surface along the axis; the inner wall of the sleeve 1 is provided with six long grooves 12 distributed along the circumferential direction of the axis from the right end to the left end; the hollow area 11 is also provided with six positioning grooves 13 distributed along the circumferential direction of the axis, the positioning groove 13 is close to the left end of the long groove 12, and the left end of the positioning groove 13 forms a certain distance with the left end of the long groove 12; the six positioning grooves 13 can be provided by opening an annular groove, and an annular groove is provided at the left end of the long groove 12, so that six positioning grooves 13 can be punched in the six raised parts spaced between the six long grooves 12, which is more convenient; the positioning groove 13 can accommodate the force transmission ring 43 to rotate therein;

[0046] Support shaft 2, such as Figure 3 As shown, it is arranged in the hollow area 11, coaxial with the sleeve 1, and the support shaft 2 is provided with a through area extending from one end surface along the axis to the other end surface; the outer wall shape of the support shaft 2 fits the inner wall shape of the sleeve 1; the left end of the support shaft 2 is fixedly connected to the left end of the sleeve 1; the left end of the support shaft 2 has a space for accommodating a clamped workpiece, and the shape of the space for clamping the workpiece is determined according to the specific situation;

[0047] like Figure 4As shown, the mandrel 3 is arranged in the through area and is coaxial with the sleeve 1; the mandrel 3 is provided with a limit ring 31, and the limit ring 31 is provided with six limit blocks 31a extending into the six long grooves 12, so that the mandrel 3 can slide in the sleeve 1 without shaking due to the excessive size of the hollow area 11 of the sleeve 1 and the influence of its own gravity, thereby improving the overall stability; the outer side of the mandrel 3 is provided with a plurality of guide grooves 32 distributed along the circumferential direction of the axis; the guide groove 32 is provided with a first oblique section 32a and a first straight section 32b from left to right, the first oblique section 32a forms an angle with the axis of the mandrel 3, and the first straight section 32b is parallel to the axis of the mandrel 3;

[0048] like Figure 7 and Figure 8 As shown, the force transmission assembly 4 includes a left bearing 41, a right bearing 42 and a force transmission ring 43; the force transmission ring 43, the left bearing 41 and the right bearing 42 are coaxial with the sleeve 1; the force transmission ring 43 is located between the left bearing 41 and the right bearing 42; the left end surface of the left bearing 41 is in contact with the right end surface of the support shaft 2; the force transmission ring 43 is provided with six force transmission blocks 43a, which are used to extend into the positioning groove 13 provided in the sleeve 1; the inner wall of the force transmission ring 43 is provided with a guide column 43b, which extends into the guide groove 32, and is used to drive the rotation of the force transmission ring 43;

[0049] Disc spring assembly 5, such as Fig. 9 As shown, it is sleeved on the core shaft 3 and located between the force transmission component 4 and the limit ring 31; when installed in place, the force transmission component 4 and the limit ring 31 will be in a compressed state, thereby providing a reverse force to the force transmission component 4 and the limit ring 31.

[0050] The specific working principle of the boring machine spindle is as follows:

[0051] When the boring machine is working, the right end of the spindle 3 is connected to the power source, and the power source will drive the spindle 3 to move left and right; during processing, the tool needs to be locked, and the power source will drive the spindle 3 to move to the far right, driving the clamped workpiece in the support shaft 2 to clamp the tool; when changing the tool, the power source will drive the spindle 3 to move to the far left, driving the clamped workpiece in the support shaft 2 to release the clamping of the tool; the structure and working principle of the connection between the clamped workpiece and the spindle 3 are existing technologies and will not be elaborated here.

[0052] The guide groove 32 in the main shaft of the boring machine cooperates with the guide column 43b, so that the guide column 43b can move from the first straight section 32b to the first inclined section 32a in the guide groove 32 when the core shaft 3 is retracted (i.e. during processing), driving the force transmission ring 43 to rotate a certain angle, so that the force transmission block 43a is aligned with the long groove 12 in the axial direction of the core shaft 3. At this time, the disc spring assembly 5 is in a relatively slightly compressed state, and the thrust provided by it will be transmitted to the force transmission ring 43. Since the force transmission block 43a is aligned with the long groove 12 and cannot transmit force, the force on the force transmission ring 43 will be transmitted to the support shaft 2 through the left bearing 41. Since the left end of the sleeve 1 is fixedly connected to the left end of the support shaft 2, the thrust of the disc spring assembly 5 will eventually be transmitted to the left end of the sleeve 1, forming a state in which the main shaft is stretched straight to the left, thereby reducing the amount of sagging of the main shaft.

[0053] When changing the tool, the mandrel 3 moves to the leftmost end within the movable range; during the movement of the mandrel 3, the limit ring 31 also moves toward the left end of the mandrel 3, thereby further compressing the disc spring assembly 5, causing the thrust generated by the disc spring assembly 5 to increase. The connection between the left end of the sleeve 1 and the left end of the support shaft 2 is difficult to support such excessive thrust, and forced support is prone to deformation and damage. In order to solve the above-mentioned problem, the present structure can cooperate with the guide column 43b through the guide groove 32, so that when the mandrel 3 moves to the leftmost end, the guide column 43b moves from the first oblique section 32a to the first straight section 32b, driving the force transmission ring 43 to rotate, so that the force transmission block 43a enters the positioning groove 13. At this time, the compressed disc spring assembly 5 applies force to the force transmission assembly 4. Because the force transmission block 43a enters the positioning groove 13, the force transmission assembly 4 transmits the force that pushes the mandrel 3 to move to the right side of the sleeve 1 through the force transmission block 43a, thereby improving the overall rigidity and stability of the spindle at this time.

[0054] The length of the first straight section 32b is preferably set to be longer than the distance the guide column 43b moves in the first straight section 32b, so that the guide column 43b will not repeatedly hit the guide groove 32, reducing wear caused by the impact and even reducing processing accuracy.

[0055] like Figure 3 As shown, a fixing ring 21 is provided on the left section of the support shaft 2, and the right end face of the fixing ring 21 fits the left end face of the sleeve 1; the fixing ring 21 is fixedly connected to the sleeve 1; the fixing ring 21 can also be separated from the support shaft 2, and only fixedly connected to the sleeve 1, because after being installed in place, the left end face of the support shaft 2 will also support the right end face of the fixing ring 21; the force brought by the disc spring assembly 5 will be transmitted to the fixing ring 21 through the support shaft 2, and then transmitted to the left end of the sleeve 1, forming a state in which the main shaft is stretched straight to the left, thereby reducing the sagging amount of the main shaft.

[0056] like Figure 4As shown, preferably, the core shaft 3 is composed of multiple short shafts 33; an external thread 33a is provided at one end of each short shaft 33, and an internal thread 33b is provided at the other end, and the internal and external threads can be designed into a multi-step stepped style to enhance the connection strength; multiple short shafts 33 are connected end to end to form the core shaft 3; because the core shaft 3 is relatively long, it is easy to process by dividing it into multiple short shafts 33 for screwing.

[0057] Also includes a support piston 6, such as Figure 6 As shown, the support piston 6 is arranged at one end of the short shaft 33 with an external thread 33a, and is used to support the core shaft 3 in the support shaft 2; due to the long length of the core shaft 3, it is easy to bend due to the influence of gravity when placed directly in the support shaft 2, and multiple support pistons 6 are arranged at the connection between multiple sections of short shafts 33, which can support the core shaft 3 and reduce the influence of gravity.

[0058] Preferably, Figure 5 As shown, the guide groove 32 also includes a second straight section 32d and a second oblique section 32c; the second straight section 32d connects the first oblique section 32a and the second oblique section 32c; the second oblique section 32c forms an angle with the axis of the core shaft 3, and the second straight section 32d is parallel to the axis of the core shaft 3; when the core shaft 3 is installed on the boring machine spindle, the guide column 43b first enters the second oblique section 32c, and then moves along the second oblique section 32c. After the core shaft 3 is installed in place, the guide column 43b stops at the right end of the second straight section 32d of the guide groove 32. At this time, the force transmission ring 43 rotates back to the state where the force transmission block 43a is aligned with the long groove 12 in the direction of the axis of the core shaft 3. The second straight section 32d and the second oblique section 32c make the installation of the core shaft 3 more convenient, and also bring the force transmission block 43a to the correct position, avoiding the problem of difficulty in rotating the force transmission ring 43 after the core shaft 3 is installed.

[0059] The core shaft 3 is provided with a transition zone 34, such as Figure 4 As shown, the diameter of the transition zone 34 gradually increases from left to right; the transition zone 34 and the limiting ring 31 are on the same section of the short shaft 33, and are the rightmost section of the core shaft 3; the guide groove 32 does not exceed the transition zone 34; in this way, the diameter of the section of the short shaft 33 with the guide groove 32 becomes larger, so that the overall strength and rigidity also become larger. On this basis, the guide groove 32 is opened, which will not affect the strength of the core shaft 3 itself, and the purpose of guiding the guide column 43b is achieved.

[0060] like Figure 3 , Figure 7 and Figure 8As shown, the right end face of the support shaft 2 is provided with a first slot 22, the outline of which corresponds to the outer wall shape of the left bearing 41; the left end face of the force transmission ring 43 is provided with a second slot, the outline of which corresponds to the outer wall shape of the left bearing 41; the right end face of the force transmission ring 43 is provided with a third slot, the outline of which corresponds to the outer wall shape of the right bearing 42; these three slots can clamp the two bearings and the force transmission ring 43 to each other, and also clamp the force transmission assembly 4 to the support shaft 2, so that the bearings are not easy to loosen.

[0061] Preferably, Figure 7 As shown, the force transmission block 43a is provided with an oil groove 43a1, which is in a curved shape; the oil groove 43a1 can increase the storage capacity of the lubricating oil, and can also form an oil film on the bearing and the force transmission block 43a to protect the normal operation of the bearing and the force transmission block 43a and reduce the wear caused by friction; and the curved shape can better guide the lubricating oil.

[0062] like Fig. 9 As shown, starting from the left end face of the left bearing 41, passing through the force transmission ring 43, the right bearing 42, the disc spring assembly 5, and ending at the right end face of the limit ring 31, the total length in the axial length direction is less than the length of the long groove 12; such a design will not directly collide with the sleeve 1 when the core shaft 3 moves back and forth, thereby reducing friction.

[0063] According to a second aspect of the present invention, a method for machining a boring machine spindle is also provided, such as Fig.11 As shown in , the following steps are included:

[0064] S10: Install the left bearing 41 of the force transmission component 4 on the support shaft 2. Because the left end of the support shaft 2 is also provided with a fixing ring 21, and the left end of the support shaft 2 is fixedly connected to the left end of the sleeve 1, it is necessary to install the support shaft 2 into the sleeve 1 from the left end of the sleeve 1, so that the fixing ring 21 will naturally contact the left end of the sleeve 1 and limit the support shaft 2 from moving toward the right end of the sleeve 1, and then fix it;

[0065] If the fixing ring 21 and the support shaft 2 are not integrated, the support shaft 2 is also installed into the sleeve 1 from the left end of the sleeve 1, because the left end of the support shaft 2 has a space for accommodating the clamped workpiece, which is slightly larger than the right end of the hollow area 11 of the sleeve 1 and cannot be installed. After the support shaft 2 is installed, the fixing ring 21 is fixedly connected to the sleeve 1, and the support shaft 2 will be firmly against the fixing ring 21 due to the subsequent installation, achieving the same effect as the previous case;

[0066] S20: Install the force transmission ring 43 of the force transmission assembly 4 into the sleeve 1 from the right end of the sleeve 1, and after abutting against the left bearing 41, rotate the force transmission ring 43 by an angle so that the force transmission block 43a extends into the positioning groove 13 to prevent the left bearing 41 from falling off; a tool such as a clamp whose front end can be opened and clamped can be used to extend into the sleeve 1, abut against the positioning ring, and then rotate the angle so that the force transmission block 43a enters the positioning groove 13;

[0067] When necessary, for example, after the force transmission ring 43 is rotated, the force transmission ring 43 cannot be stopped, or the force transmission block 43a does not completely enter the positioning groove 13, a long card strip can be inserted into a long groove 12, and the left end of the long card strip will extend all the way to the left end of the long groove 12 and abut against it, thereby limiting the rotation of the force transmission ring 43; and when the core shaft 3 is to be installed later, it can be pulled out;

[0068] S30: Assemble multiple short shafts 33 into a core shaft 3, and sleeve the disc spring assembly 5 and the right bearing 42 on the core shaft 3; then install the core shaft 3 into the sleeve 1 from the right end of the sleeve 1; when the core shaft 3 moves to the left, the guide column 43b of the force transmission ring 43 will enter the guide groove 32; when the core shaft 3 is installed in place, the guide column 43b stops at the right end of the second straight section 32d of the guide groove 32, and the force transmission ring 43 is rotated back to the state where the force transmission block 43a is aligned with the long groove 12 in the axial direction of the core shaft 3; at this time, the processing of the boring machine spindle is completed;

[0069] At this time, the required outer shell, end cover, power unit and other components can be installed on the boring machine spindle to ensure the normal operation and reliability of the boring machine spindle.

[0070] In the above processing method, the force transmission component 4 is disassembled and installed into the sleeve 1 before the mandrel 3 is installed. In addition, unlike the traditional method, the mandrel 3 and the support shaft 2 and other internal components are installed before being installed into the sleeve 1. This is mainly because:

[0071] The left bearing 41 and the right bearing 42 are plane thrust bearings, which are composed of a plane retainer assembly with needle rollers or cylindrical rollers or steel balls and a plane washer, rather than an integrated bearing. This structure causes the left bearing 41 and the right bearing 42 to be very easy to spread out, resulting in shaking and tilting, and requires external force to fix; therefore, the left bearing 41 is first fixed with the support shaft 2 and then installed into the sleeve 1, and then the left bearing 41 is supported by the transmission ring, while the right bearing 42 is firmly supported against the right end of the transmission ring by the force generated by the disc spring assembly 5 after installation; thereby achieving the effect of fixing the left bearing 41 and the right bearing 42, and avoiding the looseness of the bearing structure;

[0072] The disc spring assembly 5 will not automatically become a compressed state in the absence of external force. In the present invention, the disc spring assembly 5 needs to be changed into a compressed state after being installed in place. The entire force transmission assembly 4 cannot be installed in a free state, so the support shaft 2 and the force transmission ring 43 need to be installed in place before the disc spring assembly 5 is pushed into the sleeve 1, so as to support the disc spring assembly 5 from both ends of the disc spring assembly 5 and put it in a compressed state.

[0073] Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A boring machine spindle, characterized in that: include: A sleeve (1), one end of which is a left end and the other end of which is a right end, the sleeve (1) is provided with a hollow area (11) extending from the left end surface along the axis to the right end surface; the inner wall of the sleeve (1) is provided with six long grooves (12) distributed along the circumference of the axis from the right end to the left end; the hollow area (11) is also provided with six positioning grooves (13) distributed along the circumference of the axis, the positioning groove (13) is close to the left end of the long groove (12), and the left end of the positioning groove (13) forms a certain distance with the left end of the long groove (12); A support shaft (2) is arranged in the hollow area (11) and is coaxial with the sleeve (1); the support shaft (2) is provided with a through area extending from one end face along the axis to the other end face; the outer wall shape of the support shaft (2) fits the inner wall shape of the sleeve (1); the left end of the support shaft (2) is fixedly connected to the left end of the sleeve (1); the left end of the support shaft (2) has a space for accommodating a clamped workpiece; a fixing ring (21) is provided on the left section of the support shaft (2), the right end face of the fixing ring (21) fits the left end face of the sleeve (1); the fixing ring (21) is fixedly connected to the sleeve (1); A core shaft (3) is arranged in the through-through area and is coaxial with the sleeve (1); the core shaft (3) is provided with a limit ring (31), and the limit ring (31) is provided with six limit blocks (31a) extending into the six long grooves (12); the outer side surface of the core shaft (3) is provided with a plurality of guide grooves (32) distributed along the circumference of the axis; the guide groove (32) is provided with a first oblique section (32a) and a first straight section (32b) in sequence from left to right, the first oblique section (32a) forms an angle with the axis of the core shaft (3), and the first straight section (32b) is parallel to the axis of the core shaft (3); A force transmission assembly (4), comprising a left bearing (41), a right bearing (42) and a force transmission ring (43) all coaxial with the sleeve (1); the force transmission ring (43) is located between the left bearing (41) and the right bearing (42); the left end surface of the left bearing (41) is in contact with the right end surface of the support shaft (2); the force transmission ring (43) is provided with six force transmission blocks (43a); the inner wall of the force transmission ring (43) is provided with a guide column (43b), and the guide column (43b) extends into the guide groove (32); A disc spring assembly (5) is sleeved on the core shaft (3) and is located between the force transmission assembly (4) and the limiting ring (31); During processing, the mandrel (3) is located at the rightmost end, and the force transmission block (43a) and the long groove (12) are aligned in the axial direction of the mandrel (3); When changing the tool, the core shaft (3) is located at the leftmost end, and the force transmission block (43a) enters the positioning groove (13).

2. The boring machine spindle according to claim 1, characterized in that: The core shaft (3) is composed of a plurality of short shafts (33); an external thread (33a) is provided at one end of each short shaft (33), and an internal thread (33b) is provided at the other end; a plurality of short shafts (33) are connected end to end to form the core shaft (3).

3. The boring machine spindle according to claim 2, characterized in that: It also includes a supporting piston (6), which is arranged at one end of the short shaft (33) with an external thread (33a) and is used to support the core shaft (3) in the supporting shaft (2).

4. The boring machine spindle according to claim 2, characterized in that: The core shaft (3) is provided with a transition zone (34), the diameter of which gradually increases from left to right; the transition zone (34) and the limiting ring (31) are on the same section of the short axis (33), and constitute the rightmost section of the core shaft (3).

5. The boring machine spindle according to claim 4, characterized in that: The guide groove (32) further comprises a second straight section (32d) and a second oblique section (32c); the second straight section (32d) connects the first oblique section (32a) and the second oblique section (32c); the second oblique section (32c) forms an angle with the axis of the core shaft (3), and the second straight section (32d) is parallel to the axis of the core shaft (3); the guide groove (32) does not exceed the transition zone (34).

6. The boring machine spindle according to claim 1, characterized in that: The right end surface of the support shaft (2) is provided with a first slot (22), the contour of which corresponds to the outer wall shape of the left bearing (41); the left end surface of the force transmission ring (43) is provided with a second slot, the contour of which corresponds to the outer wall shape of the left bearing (41); the right end surface of the force transmission ring (43) is provided with a third slot, the contour of which corresponds to the outer wall shape of the right bearing (42).

7. The boring machine spindle according to claim 1, characterized in that: The force transmission block (43a) is provided with an oil groove (43a1), and the oil groove (43a1) is in a curved shape.

8. The boring machine spindle according to claim 1, characterized in that: Starting from the left end face of the left bearing (41), passing through the force transmission ring (43), the right bearing (42), the disc spring assembly (5), and ending at the right end face of the limit ring (31), the total length in the axial length direction is less than the length of the long groove (12).

9. A method for machining a boring machine spindle, characterized in that: Using the boring machine spindle according to any one of claims 1 to 8 comprises the following steps: S10: Install the left bearing (41) of the force transmission assembly (4) on the support shaft (2), and then install the support shaft (2) into the sleeve (1) from the left end of the sleeve (1); S20: Install the force transmission ring (43) of the force transmission assembly (4) into the sleeve (1) from the right end of the sleeve (1), and after the force transmission ring (43) abuts against the left bearing (41), rotate the force transmission ring (43) by an angle so that the force transmission block (43a) extends into the positioning groove (13); S30: Combine multiple short shafts (33) into a core shaft (3), and sleeve the disc spring assembly (5) and the right bearing (42) on the core shaft (3); then insert the core shaft (3) into the sleeve (1) from the right end of the sleeve (1); during the movement of the core shaft (3) to the left, the guide column (43b) of the force transmission ring (43) will enter the guide groove (32); when the core shaft (3) is installed in place, the guide column (43b) stops at the right end of the second straight section (32d) of the guide groove (32), and at this time, the force transmission ring (43) is rotated back to the state where the force transmission block (43a) and the long groove (12) are aligned in the axial direction of the core shaft (3); at this time, the processing of the boring machine spindle is completed.

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