Internal thread turning and grinding combined machining equipment and machining process

Abstract

The internal thread turning and grinding combined machining equipment comprises a machine tool body, a workpiece main shaft, an internal thread grinding wheel main shaft, an internal thread grinding wheel main shaft swing angle device and a turning tool device, an X-direction sliding plate and a Z-direction sliding plate are arranged on the machine tool body, and the turning tool device is arranged on the X-direction sliding plate. The turning tool device comprises a tool apron and a deep hole turning tool with one end fixedly connected with the tool apron, the internal thread grinding wheel spindle swing angle device and the turning tool device can be arranged on the X-direction sliding plate, and when an internal thread deep hole part with the large length-diameter ratio is dealt with, the deep hole turning tool and an internal thread grinding wheel spindle are used for achieving the technological process of firstly turning and then grinding; the clamping frequency is reduced, the machining precision is improved, the machining time is shortened, the machining cost is reduced, and the machining efficiency is improved.

Description

Technical Field

[0001] The present invention belongs to the field of mechanical processing, and more specifically relates to an internal thread turning and grinding composite processing equipment and a processing technology. Background Art

[0002] With the rapid development of humanoid robots and robot dogs in recent years, thread structures have been increasingly used in the transmission joints and load-bearing structures of various robots and robot dogs. Planetary roller screws are the most widely used among them. Among them, the internal thread grinding of the reverse planetary roller screw nut is the most difficult due to its large aspect ratio.

[0003] Currently, some inverted nut machining processes use elbow grinding, which involves grinding directly from the bottom hole. This results in large grinding volumes, long grinding times, significant grinding wheel wear, rapid elbow grinding rod consumption, and high costs. Furthermore, it also leads to insufficient machining accuracy and reduced efficiency. Therefore, an internal thread machining device and process that can address these issues is urgently needed. Summary of the Invention

[0004] The main purpose of the present invention is to provide an internal thread turning and grinding composite processing equipment and processing technology, which can effectively control the processing cost and ensure the processing accuracy and processing efficiency when dealing with internal thread deep hole parts with a large aspect ratio.

[0005] To achieve the above object, the technical solution of the present invention is:

[0006] A composite internal thread turning and grinding processing equipment includes a machine tool bed, a workpiece spindle arranged on the Z-direction slide and capable of C-axis rotation, an internal thread grinding wheel spindle arranged on the X-direction slide, an internal thread grinding wheel arranged at one end of the internal thread grinding wheel spindle, an internal thread grinding wheel spindle swing angle device capable of driving the internal thread grinding wheel spindle to rotate along the A-axis, and a turning tool device. The machine tool bed is provided with an X-direction slide and a Z-direction slide, and the turning tool device is arranged on the X-direction slide. The turning tool device includes a tool holder and a deep hole turning tool with one end fixedly connected to the tool holder.

[0007] According to an embodiment of the first aspect of the present invention, an internal thread grinding wheel dresser is provided on one side of the workpiece spindle, and the internal thread grinding wheel dresser is located on the Z-direction slide.

[0008] According to an embodiment of the first aspect of the present invention, a probe is provided on a side of the internal threaded grinding wheel spindle away from the internal threaded grinding wheel spindle angle swing device.

[0009] According to the first aspect of the present invention, the internal thread grinding wheel spindle swing angle device includes a base fixedly connected to the X-axis slide and a swing plate rotatably connected to the base at one end, and the other end of the swing plate is slidably connected to the base.

[0010] According to the first aspect of the present invention, one side of the internal thread grinding wheel spindle is slidingly connected to the swing plate.

[0011] According to an embodiment of the first aspect of the present invention, the tool holder is located on a side of the X-axis slide close to the workpiece spindle, and the deep hole turning tool is arranged parallel to the workpiece spindle.

[0012] According to the first aspect of the present invention, the X-axis slide is further provided with an outer cylindrical end surface grinding wheel spindle and an outer cylindrical end surface grinding wheel arranged at one end of the outer cylindrical end surface grinding wheel spindle.

[0013] According to an embodiment of the first aspect of the present invention, an outer cylindrical end surface grinding wheel dresser is further provided on the Z-direction slide, and the outer cylindrical end surface grinding wheel dresser is located on the workpiece spindle.

[0014] According to a second embodiment of the present invention, the process of processing by the internal thread turning and grinding composite processing equipment includes the following steps:

[0015] 1) clamping the nut through the workpiece spindle;

[0016] 2) using the deep hole turning tool to turn the internal thread of the nut to a predetermined size, leaving a margin;

[0017] 3) Use the internal thread grinding wheel to grind the internal thread of the nut to the specified size, and record it after inspection with a checking fixture.

[0018] One of the above technical solutions of the present invention has at least one of the following advantages or beneficial effects:

[0019] The present invention can arrange an internal thread grinding wheel spindle swing angle device and a turning tool device on the X-axis slide. When dealing with internal thread deep hole parts with a relatively large length-to-diameter ratio, the deep hole turning tool and the internal thread grinding wheel spindle can be used to realize the process of first turning and then grinding. This not only reduces the number of clamping times and improves the processing accuracy, but also reduces the processing time and cost and improves the processing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments;

[0021] Attachment Figure 1 This is an overall structural diagram of an embodiment of the present invention;

[0022] Attachment Figure 2 A front view of an embodiment of the present invention;

[0023] Attachment Figure 3 This is an overall structural diagram of the composite cylindrical grinding according to an embodiment of the present invention. DETAILED DESCRIPTION

[0024] The embodiments of the present invention are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and are not to be construed as limiting the present invention.

[0025] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0026] In the description of the present invention, "several" means one or more, "many" means more than two, "greater than," "less than," and "exceed" are understood to exclude the number itself, while "above," "below," and "within" are understood to include the number itself. The use of "first" and "second" in the description is solely for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, implicitly specifying the number of the indicated technical features, or implicitly specifying the order of the indicated technical features.

[0027] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or to implicitly indicate the quantity of the technical features indicated. Thus, features defined as "first" and "second" may explicitly or implicitly include one or more features.

[0028] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the term "connection" should be understood in a broad sense. For example, it can be a fixed connection or a movable connection, a detachable connection or a non-detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or mutual communication; it can be a direct connection, or an indirect connection through an intermediate medium, and it can be internal communication between two elements, indirect communication, or an interactive relationship between two elements.

[0029] The following disclosure provides many different embodiments or examples for implementing different solutions of the present invention.

[0030] Refer to the attached Figure 1 To the attached Figure 3 As shown, an internal thread turning and grinding composite processing equipment includes a machine tool bed 1, an X-axis slide 11 and a Z-axis slide 12 arranged on the machine tool bed 1, an X-axis transmission mechanism 21 for driving the X-axis slide 11, a Z-axis transmission mechanism 22 for driving the Z-axis slide 12, and a workpiece spindle 3 arranged on the Z-axis slide 12 and capable of C-axis rotation.

[0031] In one embodiment of the present invention, an internal thread grinding wheel spindle 4 and an internal thread grinding wheel 41 are provided on the X-axis slide 11. The machine tool bed 1 is a flat bed structure. The internal thread turning and grinding composite processing equipment has four CNC coordinate axes X / Z / A / C, including a C axis for workpiece rotation.

[0032] In one embodiment of the present invention, an internal threaded grinding wheel spindle swing angle device 5 is provided for driving the internal threaded grinding wheel spindle 4 to rotate along the A axis, and includes a base 51 fixedly connected to the X-axis slide 11 and a swing plate 52 rotatably connected to the base 51 at one end, the other end of the swing plate 52 is slidably connected to the base 51, and one side of the internal threaded grinding wheel spindle 4 is slidably connected to the swing plate 52.

[0033] In one embodiment of the present invention, when the swing plate 52 swings in a circle around a fixed point, it can drive the internal thread grinding wheel spindle 4 to rotate along the A axis. Since the internal thread grinding wheel spindle 4 needs to be swung to the corresponding helix angle to form an angle with the workpiece for grinding during thread grinding, the bottom hole grinding and end face grinding require the internal thread grinding wheel spindle 4 to be parallel to the workpiece for grinding.

[0034] In one embodiment of the present invention, during the grinding process, the internal thread grinding wheel spindle 4 needs to automatically swing in order to complete the grinding requirements of multiple processes. This internal thread turning and grinding composite processing equipment can ensure that the inclination direction of the internal thread grinding wheel spindle 4 is the same as the direction of the workpiece thread lead angle, and the angle size is equal when grinding the thread through the internal thread grinding wheel spindle swing device 5.

[0035] In one embodiment of the present invention, the turning tool device is arranged on the upper end surface of the X-axis slide 11, and the turning tool device includes a tool holder 61 and a deep hole turning tool 62 whose one end is fixedly connected to the tool holder 61, wherein the tool holder 61 is located on the side of the X-axis slide 11 close to the workpiece spindle 3, and the deep hole turning tool 62 is arranged parallel to the workpiece spindle 3, and then the deep hole turning tool 62 is used to perform thread turning operations during the processing.

[0036] In one embodiment of the present invention, when processing a part with a relatively large aspect ratio and a thin wall, in order to complete the fine processing of the internal thread of the part, the internal thread turning and grinding composite processing equipment can first use a deep hole turning tool 62 to turn the thread, and further use the internal thread grinding wheel spindle 4 to grind the internal thread, which not only reduces the number of clamping times and improves the processing accuracy, but also reduces the cost of the processing workshop and saves the space occupied by processing.

[0037] In one embodiment of the present invention, the X-axis transmission mechanism 21 includes two first slide rails 211 arranged parallel to the X-axis direction and a first motor whose output end is connected to the X-axis slide 11. The X-axis slide 11 is slidably connected to the two first slide rails 211 respectively.

[0038] In one embodiment of the present invention, the Z-direction transmission mechanism 22 includes two second slide rails 221 arranged parallel to the Z-axis direction and a second motor whose output end is connected to the Z-direction slide 12, and the Z-direction slide 12 is slidably connected to the two second slide rails 221 respectively.

[0039] In one embodiment of the present invention, during processing by the internal thread turning and grinding composite processing equipment, since the parts are clamped and processed in one step, the requirements for tooling and fixtures are reduced, and the requirements for the process installation positions of the parts are reduced. There is no need to process the positioning positions of the fixtures (such as pin holes, stops, offsets, etc.) on the parts to position the clamping tooling and fixtures of subsequent processing steps, thereby reducing unnecessary features and reducing the complexity of part processing.

[0040] In one embodiment of the present invention, an internal thread grinding wheel dresser 7 is provided on one side of the workpiece spindle 3, the internal thread grinding wheel dresser 7 is located on the Z-axis slide 12, and a probe 8 is provided on the side of the internal thread grinding wheel spindle 4 away from the internal thread grinding wheel spindle swing device 5.

[0041] In one embodiment of the present invention, an outer cylindrical end face grinding wheel spindle and an outer cylindrical end face grinding wheel are provided on the X-direction slide 11, and an outer cylindrical end face grinding wheel dresser is provided on the Z-direction slide 12. The outer cylindrical end face grinding wheel dresser is located on the workpiece spindle 3 (see attached Figure 3 ), and thus also has the function of cylindrical grinding.

[0042] This internal thread turning and grinding composite processing equipment is equipped with an internal thread grinding wheel spindle 4, a tool holder 61 and a deep hole turning tool 62 in terms of tools (turning tool and grinding wheel), which can complete the thread turning, thread grinding and other processes of the parts with one clamping, ensure the part processing accuracy, improve the overall processing efficiency, and reduce the management cost of the processing workshop. In addition, for internal thread deep hole parts with a relatively large length-to-diameter ratio, the process of turning first and then grinding can be realized, which reduces the processing time, improves the processing efficiency, reduces the grinding wheel loss, and reduces the cost.

[0043] This internal thread turning and grinding composite processing equipment can realize the process of turning first and then grinding, so that the overall processing efficiency has been greatly improved, and the wear of the grinding wheel has been reduced. The specific processing steps are as follows:

[0044] 1. Clamp the nut through the workpiece spindle 3;

[0045] 2. Using the deep hole turning tool 62, the internal thread of the nut is turned to a predetermined size, with a margin left;

[0046] 3. Grind the internal thread of the nut to the specified size using the internal thread grinding wheel 41, and record the result after inspection using a checking fixture.

[0047] That is, during the processing, the nut is first clamped, the internal thread is turned to a certain allowance, and then the internal thread is finely ground to the size and inspected using a gauge.

[0048] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the claims and their equivalents.

Claims

1. An internal thread turning and grinding composite processing equipment, characterized in that: include; A machine tool bed (1), wherein an X-direction slide (11) and a Z-direction slide (12) are provided on the machine tool bed (1); A workpiece spindle (3) disposed on the Z-direction slide (12) and capable of C-axis rotation; An internally threaded grinding wheel spindle (4) disposed on the X-direction slide (11) and an internally threaded grinding wheel (41) disposed at one end of the internally threaded grinding wheel spindle (4); An internal thread grinding wheel spindle swing angle device (5) capable of driving the internal thread grinding wheel spindle (4) to rotate along the A axis; A turning tool device is provided on the X-axis slide (11), and comprises a tool holder (61) and a deep hole turning tool (62) with one end fixedly connected to the tool holder (61).

2. The internal thread turning and grinding composite processing equipment according to claim 1, characterized in that: An internal thread grinding wheel dresser (7) is provided on one side of the workpiece spindle (3), and the internal thread grinding wheel dresser (7) is located on the Z-direction slide (12).

3. The internal thread turning and grinding composite processing equipment according to claim 1, characterized in that: A probe (8) is provided on the side of the internal thread grinding wheel main shaft (4) away from the internal thread grinding wheel main shaft swing angle device (5).

4. The internal thread turning and grinding composite processing equipment according to claim 1, characterized in that: The internal thread grinding wheel spindle swing angle device (5) comprises a base (51) fixedly connected to the X-direction slide (11) and a swing plate (52) having one end rotatably connected to the base (51), and the other end of the swing plate (52) is slidably connected to the base (51).

5. The internal thread turning and grinding composite processing equipment according to claim 4, characterized in that: One side of the internal thread grinding wheel main shaft (4) is slidably connected to the swing plate (52).

6. The internal thread turning and grinding composite processing equipment according to claim 1, characterized in that: The tool holder (61) is located on a side of the X-axis slide (11) close to the workpiece spindle (3), and the deep hole turning tool (62) is arranged parallel to the workpiece spindle (3).

7. The internal thread turning and grinding composite processing equipment according to claim 1, characterized in that: The X-direction slide (11) is also provided with an outer cylindrical end surface grinding wheel spindle and an outer cylindrical end surface grinding wheel arranged at one end of the outer cylindrical end surface grinding wheel spindle.

8. The internal thread turning and grinding composite processing equipment according to claim 7, characterized in that: The Z-direction slide (12) is also provided with an outer cylindrical end surface grinding wheel dresser, and the outer cylindrical end surface grinding wheel dresser is located on the workpiece spindle (3).

9. A process for machining by using the internal thread turning and grinding composite machining equipment according to any one of claims 1 to 8, characterized in that: The steps include: 1) clamping the nut via the workpiece spindle (3); 2) using the deep hole turning tool (62) to turn the internal thread of the nut to a predetermined size, leaving a margin; 3) Grind the internal thread of the nut to a specified size using the internal thread grinding wheel (41), and record the result after inspection using a checking tool.

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