Floating center frame for external thread grinding machine and workpiece positioning method

Abstract

The invention discloses a floating center frame for an external thread grinding machine and a workpiece positioning method.The floating center frame comprises a frame body, a first clamping jaw mechanism, a second clamping jaw mechanism, an ejector rod mechanism and a locking mechanism, and the first clamping jaw mechanism comprises a first clamping jaw and a first ejector rod acting on the movable end of the first clamping jaw; the second clamping jaw mechanism comprises a second clamping jaw with one end hinged to the frame body and a second ejector rod used for pushing the other end of the second clamping jaw to swing up and down, the ejector rod mechanism comprises a third ejector rod and a floating ejector block arranged at one end of the third ejector rod, and workpieces of different sizes can be adapted by adjusting the first clamping jaw mechanism, the second clamping jaw mechanism and the ejector rod mechanism; and meanwhile, the first floating pressing plate and the first clamping jaw, the floating ejector block and the third ejector rod, and the second floating pressing plate and the second clamping jaw are in floating connection, so that the floating clamping device can adapt to various complex parts and working conditions, is easy to operate, can effectively reduce vibration, and can improve the machining efficiency and the machining precision.

Description

Technical Field

[0001] The present invention belongs to the technical field of machining, and more particularly relates to a floating steady rest for an external thread grinding machine and a workpiece positioning method. Background Art

[0002] A floating steady rest is a device used to support and position a rotating workpiece, providing stable support during the rotation of the workpiece to reduce vibration and deformation, thereby improving machining accuracy and surface quality. The floating steady rest is usually used in equipment such as lathes and grinding machines. Especially when machining long shaft workpieces, it can effectively prevent the bending and vibration of the workpiece caused by its own weight or cutting force.

[0003] During the machining process, long shaft workpieces are prone to deflection and vibration, resulting in a decrease in machining accuracy. Existing fixed steady rests need to be frequently adjusted when adapting to workpieces of different diameters, with complex operations and time waste. Moreover, due to their rigid connection method, they cannot adapt to the small deformations of the workpiece caused by cutting force, thermal deformation, or its own weight, easily causing the workpiece to be subjected to additional stress, even resulting in surface damage or a decrease in machining accuracy, or even damaging the cutting tool. Therefore, there is an urgent need for a floating steady rest and a workpiece positioning method that can adapt to the deformation of the workpiece and reduce vibration. Summary of the Invention

[0004] The main purpose of the present invention is to provide a floating steady rest for an external thread grinding machine and a workpiece positioning method to ensure simple operation and effective improvement of machining efficiency and machining accuracy.

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

[0006] A floating steady rest for an external thread grinding machine includes a frame body, a first jaw mechanism, a second jaw mechanism, a push rod mechanism, and a locking mechanism. The first jaw mechanism includes a first jaw hinged to the frame body and a first push rod acting on the movable end of the first jaw. A first floating pressing plate is provided at the movable end of the first jaw. The second jaw mechanism includes a second jaw with one end hinged to the frame body and a second push rod for pushing the other end of the second jaw to swing up and down. A second floating pressing plate is provided at the end of the second jaw corresponding to the first floating pressing plate. The push rod mechanism is arranged between the first jaw mechanism and the second jaw mechanism. The push rod mechanism includes a third push rod and a floating top block provided at one end of the third push rod. An activity cavity for placing the workpiece is formed among the floating top block, the first floating pressing plate, and the second floating pressing plate. The locking mechanism includes a first locking nut provided on the second jaw and a second locking nut provided on the third push rod.

[0007] According to an embodiment of the first aspect of the present invention, the first jaw mechanism further includes a first adjusting nut for adjusting the reciprocating motion of the first ejector rod and a first floating pin for connecting the first floating pressure plate and the first jaw.

[0008] According to an embodiment of the first aspect of the present invention, one side of the first floating pressure plate is connected to the first jaw, and the other side of the first floating pressure plate is provided with a first pressing surface that can contact the workpiece.

[0009] According to an embodiment of the first aspect of the present invention, the frame body is provided with a first mounting plate through which the first ejector rod can pass, and one end of the first mounting plate away from the first ejector rod is hinged to the frame body.

[0010] According to an embodiment of the first aspect of the present invention, the second jaw mechanism further includes a second adjusting nut for adjusting the reciprocating motion of the second ejector rod and a second floating pin for connecting the second floating pressure plate and the second jaw.

[0011] According to an embodiment of the first aspect of the present invention, one side of the second floating pressure plate is connected to the second jaw, and the other side of the second floating pressure plate is provided with a second pressing surface that can contact the workpiece.

[0012] According to an embodiment of the first aspect of the present invention, the ejector rod mechanism further includes a third adjusting nut for enabling the reciprocating motion of the third ejector rod and a third floating pin for connecting the floating top block and the third ejector rod.

[0013] According to an embodiment of the first aspect of the present invention, the frame body includes a mounting base and a mounting frame perpendicular to the mounting base, and the first jaw mechanism, the second jaw mechanism, and the ejector rod mechanism are all arranged on the same side of the mounting frame.

[0014] According to an embodiment of the first aspect of the present invention, the mounting frame is provided with a second mounting plate for fixing the second ejector rod, one end of the second mounting plate is fixedly connected to the mounting frame, and the other end of the second mounting plate is provided with a mounting hole through which the second ejector rod can pass.

[0015] According to an embodiment of the second aspect of the present invention, a method for positioning a workpiece by using the floating steady rest for an external thread grinding machine includes the following steps:

[0016] 1), Rotate the first adjusting nut, the second adjusting nut, and the third adjusting nut so that the movable cavity can place the workpiece to be processed;

[0017] 2), Place the workpiece in the movable cavity between the floating top block, the first floating pressure plate, and the second floating pressure plate;

[0018] 3), Rotate the first adjusting nut, and the first ejector rod pushes the first jaw so that the first pressing surface contacts the surface of the workpiece;

[0019] 4), Rotate the second adjusting nut, and the second ejector rod pushes the second jaw so that the second pressing surface contacts the surface of the workpiece;

[0020] 5), Adjust the ejector rod mechanism, rotate the third adjusting nut, and the third ejector rod drives the floating ejector block to move so that the floating ejector block contacts the surface of the workpiece, and adjust the upper generatrix and the measuring generatrix of the workpiece to meet the required accuracy;

[0021] 6), Adjust the first locking nut and the second locking nut respectively, fix the second jaw and the third ejector rod, and lock the workpiece to be machined in the movable cavity.

[0022] One of the technical solutions in the above technical solutions of the present invention has at least the following advantages or beneficial effects:

[0023] The present invention can adapt to workpieces of different sizes by adjusting the first jaw mechanism, the second jaw mechanism, and the ejector rod mechanism. At the same time, floating connections are adopted between the first floating pressing plate and the first jaw, the floating ejector block and the third ejector rod, and the second floating pressing plate and the second jaw, which can adapt to various complex parts and working conditions, with simple operation, effectively reducing vibration, thereby improving the processing efficiency and processing accuracy. Description of the Drawings

[0024] The following further describes the present invention in conjunction with the drawings and embodiments;

[0025] Attached Figure 1 is the overall structure diagram of an embodiment of the present invention;

[0026] Attached Figure 2 is a partial cross-sectional view of an embodiment of the present invention;

[0027] Attached Figure 3 is a side view of an embodiment of the present invention;

[0028] Attached Figure 4 is a top view of an embodiment of the present invention;

[0029] Attached Figure 5 is a bottom view of an embodiment of the present invention. Detailed Embodiments

[0030] The embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, in which the same or similar reference numerals denote 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 only for explaining the present invention and should not be construed as limiting the present invention.

[0031] In the description of the present invention, it should be understood that with respect to the orientation description, such as up, down, front, back, left, right, etc., the orientation or positional relationship indicated is based on the orientation or positional relationship shown in the accompanying drawings. It is 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 thus should not be construed as limiting the present invention.

[0032] In the description of the present invention, the meaning of several is one or more, the meaning of multiple is two or more, greater than, less than, exceeding, etc. are understood as not including the recited number, and above, below, within, etc. are understood as including the recited number. If there is a description of first and second, it is only for the purpose of distinguishing technical features and should not be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or the sequence relationship of the indicated technical features.

[0033] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more features.

[0034] 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, or a detachable connection or an inseparable connection, or an integral connection; it can be a mechanical connection, an electrical connection or a connection capable of mutual communication; it can be directly connected or indirectly connected through an intermediate medium, and can be the communication inside two elements, indirect communication or the interaction relationship between two elements.

[0035] The following disclosure provides many different embodiments or examples for implementing different solutions of the present invention.

[0036] Referring to Att Figure 1 to Att Figure 5 As shown, a floating steady rest for an external thread grinding machine includes a frame body 1, a first jaw mechanism 2, a second jaw mechanism 3, a mandrel mechanism 4 and a locking mechanism 5, wherein the second jaw mechanism 3 is located below the first jaw mechanism 2, and the mandrel mechanism 4 is arranged between the first jaw mechanism 2 and the second jaw mechanism 3.

[0037] In one embodiment of the present invention, the first jaw mechanism 2 includes a first jaw 21 hinged to the frame body 1, a first ejector rod 22 acting on the movable end of the first jaw 21, a first floating pressure plate 23 provided at the movable end of the first jaw 21, a first adjusting nut 24 for adjusting the reciprocating movement of the first ejector rod 22, and a first floating pin 25 for connecting the first floating pressure plate 23 and the first jaw 21. One side of the first floating pressure plate 23 is connected to the first jaw 21, and the other side of the first floating pressure plate 23 is provided with a first pressure surface that can contact the workpiece, and the first pressure surface can be subjected to hardening treatment.

[0038] In one embodiment of the present invention, a first mounting plate 6 through which the first ejector rod 22 can pass is provided on the frame body 1. One end of the first mounting plate 6 away from the first ejector rod 22 is hinged to the frame body 1, and the first mounting plate 6 is arranged at the top of the frame body 1, which is convenient for pressing the movable end of the first jaw 21 through the first ejector rod 22 after rotation, so as to fix the workpiece.

[0039] In one embodiment of the present invention, the second jaw mechanism 3 includes a second jaw 31 with one end hinged to the frame body 1, a second ejector rod 32 for pushing the other end of the second jaw 31 to swing up and down, a second floating pressure plate 33 provided at the end of the second jaw 31 corresponding to the first floating pressure plate 23, a second adjusting nut 34 for adjusting the reciprocating movement of the second ejector rod 32, and a second floating pin 35 for connecting the second floating pressure plate 33 and the second jaw 31.

[0040] In one embodiment of the present invention, one side of the second floating pressure plate 33 is connected to the second jaw 31, and the other side of the second floating pressure plate 33 is provided with a second pressure surface that can contact the workpiece, and the second pressure surface can be subjected to hardening treatment. By adopting the connection method of the floating pin, the force on each part of the frame body 1 can be made more uniform.

[0041] In one embodiment of the present invention, the ejector rod mechanism 4 is arranged between the first jaw mechanism 2 and the second jaw mechanism 3. The ejector rod mechanism 4 includes a third ejector rod 41, a floating top block 42 provided at one end of the third ejector rod 41, a third adjusting nut 43 for enabling the third ejector rod 41 to reciprocate, and a third floating pin 44 for connecting the floating top block 42 and the third ejector rod 41. An activity cavity for placing the workpiece is formed among the floating top block 42, the first floating pressure plate 23, and the second floating pressure plate 33.

[0042] In one embodiment of the present invention, the frame body 1 includes a mounting base 11 and a mounting frame 12 perpendicular to the mounting base 11. The first jaw mechanism 2, the second jaw mechanism 3, and the ejector rod mechanism 4 are all arranged on the same side of the mounting frame 12. A second mounting plate 7 for fixing the second ejector rod 32 is provided on the mounting frame 12. One end of the second mounting plate 7 is fixedly connected to the mounting frame 12, and the other end of the second mounting plate 7 is provided with a mounting hole through which the second ejector rod 22 can pass.

[0043] In one embodiment of the present invention, the locking mechanism 5 includes a first locking nut 51 provided on the second jaw 31 and a second locking nut 52 provided on the third ejector rod 41. On the floating steady rest for the external thread grinding machine, by providing the first jaw 21, the second jaw 31, and the third ejector rod 41, they swing on the same side of the mounting frame 12. By adjusting the first adjusting nut 24, the second adjusting nut 34, and the third adjusting nut 43, it can adapt to workpieces of different sizes. At the same time, a floating connection is adopted between the first floating pressing plate 23 and the first jaw 21, the floating top block 42 and the third ejector rod 41, and the second floating pressing plate 33 and the second jaw 31, which can adapt to various complex parts and working conditions. Thus, when adjusting the upper generatrix and the side generatrix of the workpiece to meet the required precision respectively, the first locking nut 51 and the second locking nut 52 are adjusted respectively to fix the second jaw 31 and the third ejector rod 41, and lock the workpiece to be machined in the movable cavity.

[0044] A method for positioning a workpiece by using the floating steady rest for the external thread grinding machine includes the following steps:

[0045] First, rotate the first adjusting nut 24, the second adjusting nut 34, and the third adjusting nut 43 so that the movable cavity can place the workpiece to be machined, and place the workpiece in the movable cavity between the floating top block 42, the first floating pressing plate 23, and the second floating pressing plate 33;

[0046] Further rotate the first adjusting nut 24 so that the first ejector rod 22 pushes the first jaw 21 to ensure that the first pressing surface is in contact with the surface of the workpiece;

[0047] Further rotate the second adjusting nut 34 so that the second ejector rod 32 pushes the second jaw 31 to ensure that the second pressing surface is in contact with the surface of the workpiece;

[0048] Further adjust the ejector rod mechanism 4, rotate the third adjusting nut 43, and the third ejector rod 41 drives the floating top block 42 to move so that the floating top block 42 is in contact with the surface of the workpiece, and adjust the upper generatrix and the side generatrix of the workpiece to all meet the required precision;

[0049] Finally, adjust the first locking nut 51 and the second locking nut 52 respectively to fix the second jaw 31 and the third ejector rod 41, and lock the workpiece to be machined in the movable cavity.

[0050] In the above processing steps, the operation sequence of the first jaw mechanism 2, the second jaw mechanism 3, and the ejector rod mechanism 4 can be adjusted according to the specific situation of the machined part.

[0051] The workpiece positioning method using the floating steady rest for this external thread grinding machine solves the problem that the support stiffness and damping characteristics are difficult to accurately control in the prior art, can adapt to various complex parts and working conditions. Especially when machining long shaft workpieces, it can effectively prevent the bending and vibration of the workpiece caused by its own weight or cutting force, is easy to operate, reduces vibration, and thus improves the machining efficiency and machining accuracy.

[0052] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the claims and their equivalents.

Claims

1. A floating center stand for an external thread grinder, characterized in that: It comprises a frame (1), a first clamping jaw mechanism (2), a second clamping jaw mechanism (3), a push rod mechanism (4) and a locking mechanism (5): The first clamping jaw mechanism (2) comprises a first clamping jaw (21) hinged to the frame (1) and a first push rod (22) acting on the movable end of the first clamping jaw (21); the movable end of the first clamping jaw (21) is provided with a first floating pressure plate (23); The second clamping jaw mechanism (3) comprises a second clamping jaw (31) having one end hinged to the frame body (1) and a second push rod (32) for pushing the other end of the second clamping jaw (31) to swing up and down, and a second floating pressure plate (33) is provided at one end of the second clamping jaw (31) corresponding to the first floating pressure plate (23); The push rod mechanism (4) is arranged between the first clamping jaw mechanism (2) and the second clamping jaw mechanism (3), and the push rod mechanism (4) comprises a third push rod (41) and a floating push block (42) arranged at one end of the third push rod (41), and a movable cavity for placing a workpiece is formed between the floating push block (42), the first floating pressure plate (23) and the second floating pressure plate (33); The locking mechanism (5) comprises a first locking nut (51) arranged on the second clamping jaw (31) and a second locking nut (52) arranged on the third push rod (41).

2. The floating center stand for an external thread grinder according to claim 1, characterized in that: The first clamping jaw mechanism (2) further comprises a first adjusting nut (24) for adjusting the reciprocating motion of the first push rod (22) and a first floating pin (25) for connecting the first floating pressure plate (23) and the first clamping jaw (21).

3. The floating center stand for an external thread grinder according to claim 2, characterized in that: One side of the first floating pressure plate (23) is connected to the first clamping jaw (21), and the other side of the first floating pressure plate (23) is provided with a first pressing surface capable of contacting a workpiece.

4. The floating center stand for an external thread grinder according to claim 2, characterized in that: The frame body (1) is provided with a first mounting plate (6) through which the first push rod (22) can pass, and one end of the first mounting plate (6) away from the first push rod (22) is hinged to the frame body (1).

5. The floating center stand for an external thread grinder according to claim 1, characterized in that: The second clamping jaw mechanism (3) also includes a second adjusting nut (34) for adjusting the reciprocating motion of the second push rod (32) and a second floating pin (35) for connecting the second floating pressure plate (33) and the second clamping jaw (31).

6. The floating center stand for an external thread grinder according to claim 5, characterized in that: One side of the second floating pressure plate (33) is connected to the second clamping jaw (31), and the other side of the second floating pressure plate (33) is provided with a second pressing surface capable of contacting a workpiece.

7. The floating center stand for an external thread grinder according to claim 1, characterized in that: The push rod mechanism (4) also includes a third adjustment nut (43) capable of causing the third push rod (41) to reciprocate, and a third floating pin (44) for connecting the floating push block (42) and the third push rod (41).

8. The floating center stand for an external thread grinder according to claim 1, characterized in that: The frame body (1) comprises a mounting base (11) and a mounting frame (12) arranged perpendicular to the mounting base (11); the first clamping jaw mechanism (2), the second clamping jaw mechanism (3) and the push rod mechanism (4) are all arranged on the same side of the mounting frame (12).

9. The floating center stand for an external thread grinder according to claim 8, characterized in that: The mounting frame (12) is provided with a second mounting plate (7) for fixing the second push rod (32); one end of the second mounting plate (7) is fixedly connected to the mounting frame (12); and the other end of the second mounting plate (7) is provided with a mounting hole for the second push rod (22) to pass through.

10. A method for positioning a workpiece by using a floating center stand for an external thread grinder according to any one of claims 1 to 9, characterized in that: The steps include: 1) rotating the first adjusting nut (24), the second adjusting nut (34) and the third adjusting nut (43) so that the movable cavity can be used to place the workpiece to be processed; 2) placing a workpiece in the movable cavity between the floating top block (42), the first floating pressure plate (23) and the second floating pressure plate (33); 3) rotating the first adjusting nut (24), so that the first push rod (22) pushes the first clamping jaw (21) so that the first pressing surface contacts the surface of the workpiece; 4) rotating the second adjusting nut (34), so that the second push rod (32) pushes the second clamping jaw (31) so that the second pressing surface contacts the surface of the workpiece; 5) Adjust the push rod mechanism (4), rotate the third adjustment nut (43), and the third push rod (41) drives the floating push block (42) to move, so that the floating push block (42) contacts the surface of the workpiece, and the upper generatrix and the measuring generatrix of the workpiece are all adjusted to meet the required accuracy; 6) respectively adjusting the first locking nut (51) and the second locking nut (52), fixing the second clamping jaw (31) and the third push rod (41), and locking the workpiece to be processed in the movable cavity.

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