Internal thread grinding machine

Abstract

The invention provides an internal thread grinding machine which is used for grinding internal threads of shaft parts, the internal thread grinding machine comprises a machine body, a workbench, a part supporting mechanism, at least two grinding mechanisms and a controller, and the controller is used for controlling the part supporting mechanism to drive the shaft parts to rotate around the center lines of the shaft parts. And the pair of opposite grinding rods and the shaft part are controlled to do relative movement so as to execute the internal thread grinding action, and the internal thread grinding action is as follows: the pair of opposite grinding rods extend into the central hole from the two ends of the shaft part so as to synchronously grind the internal thread; and the grinding wheels of the pair of opposite grinding rods at least respectively move from respective grinding starting points to respective grinding end points along the direction of the center line so as to finish the process of grinding the internal threads. According to the internal thread grinding device, when the shaft part is driven by the part supporting mechanism to rotate, the pair of grinding rods synchronously grind the internal thread of the shaft part, and the internal thread grinding work efficiency is greatly improved.

Description

Technical Field

[0001] The present invention relates to the technical field of metal cutting machine tools, in particular to an internal thread grinding machine. Background Art

[0002] Internal thread grinders are used in metal cutting machines to grind the internal threads of shaft parts. Existing internal thread grinders typically use a chuck to clamp one end of the shaft part, allowing a grinding rod to extend from the other end into the center hole of the shaft part to complete the internal thread grinding. However, this grinding method uses a single grinding wheel to complete all internal thread grinding, resulting in low grinding efficiency. Furthermore, when applied to internal thread grinding of shaft parts with large aspect ratios, the grinding rod needs to be at least longer than the shaft part. Excessively long grinding rods are prone to deformation due to the large grinding load arm, affecting the grinding accuracy of the internal threads of shaft parts with large aspect ratios. Summary of the Invention

[0003] The invention provides an internal thread grinding machine.

[0004] Specifically, the present invention is achieved through the following technical solutions:

[0005] An embodiment of the present invention provides an internal thread grinder for grinding internal threads of shaft parts, wherein the shaft parts are formed with a through center hole, and the internal threads are arranged on the inner surface of the center hole around the center line of the center hole. The internal thread grinder includes a bed, a workbench, a part support mechanism, at least two grinding mechanisms and a controller. The workbench and the at least two grinding mechanisms are all arranged on the bed, and the grinding mechanisms are respectively arranged on both sides of the workbench. The part support mechanism is arranged on the workbench. The shaft parts are supported by the part support mechanism for rotation around their center line and are exposed at both ends. Each grinding mechanism is provided with a part support mechanism extending toward the part support mechanism. grinding rods, so that a pair of opposite grinding rods arranged on both sides of the workbench can extend from the two ends of the shaft part into the center hole to grind the internal thread, wherein the controller is used to control the part support mechanism to drive the shaft part to rotate around its center line, and control the relative movement between the pair of opposite grinding rods and the shaft part to perform the internal thread grinding action, the internal thread grinding action is: a pair of opposite grinding rods extend from the two ends of the shaft part into the center hole to synchronously grind the internal thread, and the grinding wheels of the pair of opposite grinding rods move at least along the center line direction from their respective grinding starting points to the grinding end points to complete the internal thread grinding process.

[0006] In some embodiments, the grinding wheels of the pair of opposing grinding rods move at least along the centerline direction from respective grinding starting points approaching each other to respective grinding end points moving away from each other to complete the internal thread grinding process.

[0007] In some embodiments, the grinding starting point is located in the middle area of the center hole of the shaft part, and the grinding end points are respectively located in the two end areas of the center hole of the shaft part.

[0008] In some embodiments, the grinding wheels of the pair of opposing grinding rods move at least along the centerline direction from respective grinding starting points that are away from each other to respective grinding end points that are close to each other to complete the internal thread grinding process.

[0009] In some embodiments, the grinding end point is located in the middle area of the center hole of the shaft part, and the grinding starting points are located at both ends of the center hole of the shaft part.

[0010] In some embodiments, the pair of opposing grinding rods have grinding wheels with the same grit; or, the pair of opposing grinding rods have grinding wheels with different grits.

[0011] In some embodiments, when the pair of opposing grinding rods have grinding wheels with different coarse and fine grits, the grinding wheels of the pair of opposing grinding rods move in at least the same direction along the center line direction, so that the internal thread is ground successively by the grinding wheels with coarser grit and the grinding wheels with finer grits of the pair of opposing grinding rods.

[0012] In some embodiments, the part support mechanism is rotatably arranged on a workbench around a rotating shaft extending in a vertical direction, so that the two ends of the shaft part can be rotated in a horizontal plane, thereby switching between the pair of opposite grinding rod stations.

[0013] In some embodiments, the part support mechanism and / or the grinding mechanism is provided with an angle adjustment structure so that an angle is formed between the grinding rod and the center line of the shaft part, so that the grinding rod can adapt to the thread profile angle of the internal thread.

[0014] In some embodiments, during the synchronous internal thread grinding process, any one of the pair of opposing grinding rods adopts continuous movement, reciprocating movement, or intermittent movement from the grinding start point to the grinding end point.

[0015] According to an embodiment of the present invention, the ends of the shaft parts are exposed, and the grinding rods of a pair of grinding mechanisms arranged on both sides of the workbench are controlled by a controller to face each other and extend into the center hole. While the shaft parts are driven to rotate by the parts support mechanism, the pair of grinding rods synchronously grind the internal threads of the shaft parts, thereby greatly improving the efficiency of the internal thread grinding work.

[0016] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0018] Figure 1is a schematic diagram of an internal thread grinding machine in one embodiment of the present invention;

[0019] Figure 2 is a top view of an internal thread grinding machine in one embodiment of the present invention;

[0020] Figure 3 is a front view of an internal thread grinding machine in one embodiment of the present invention;

[0021] Figure 4 Schematic diagram of the internal thread grinding state of a shaft part in one embodiment of the present invention;

[0022] Figure 5a Schematic diagram of the grinding starting point of the first grinding method for the internal thread of a shaft part in one embodiment of the present invention;

[0023] Figure 5b Schematic diagram of the grinding end point of the first grinding method for the internal thread of a shaft part in one embodiment of the present invention;

[0024] Figure 6a Schematic diagram of the grinding starting point of the second grinding method for the internal thread of a shaft part in one embodiment of the present invention;

[0025] Figure 6b Schematic diagram of the grinding end point of the second grinding method for the internal thread of a shaft part in one embodiment of the present invention

[0026] Figure 7a Schematic diagram of the grinding starting point of the third grinding method for the internal thread of a shaft part in one embodiment of the present invention;

[0027] Figure 7b Schematic diagram of the grinding end point of the third grinding method for the internal thread of a shaft part in one embodiment of the present invention.

[0028] Reference numerals:

[0029] 01: Shaft parts; 10: Bed; 20: Workbench; 30: Parts support mechanism; 40: Grinding mechanism; 41: Spindle; 42: Grinding rod; 43: Grinding wheel. DETAILED DESCRIPTION

[0030] The present invention will now be discussed with reference to several embodiments. It should be understood that these embodiments are discussed only to enable those skilled in the art to better understand and thus implement the present invention, rather than implying any limitation on the scope of the present invention.

[0031] As used herein, the term "including" and its variations are to be interpreted as open-ended terms meaning "including but not limited to," the terms "embodiment" and "one embodiment" are to be interpreted as "at least one embodiment," and the term "another embodiment" is to be interpreted as "at least one other embodiment." The terms "first," "second," and the like may refer to different or identical objects. The term "configured" is not limited to direct or indirect connections, nor is it limited to a specific method of connection. Other explicit and implicit definitions may be included below.

[0032] In the following description, some specific numerical values or numerical ranges may be involved. It should be understood that these numerical values and numerical ranges are merely exemplary, and they may be helpful in putting the idea of the present invention into practice. However, the description of these examples is not intended to limit the scope of the present invention in any way. According to specific application scenarios and requirements, these numerical values or numerical ranges can be set separately.

[0033] The shaft parts mentioned in the embodiment of the present invention can be a circular shaft with a circular or non-circular cross-section, a stepped shaft with a variable cross-section, or a tapered shaft with a variable cross-section, wherein the shaft parts have a center line o1, and the shaft parts extend their length along the direction of the center line o1. A center hole is formed in the shaft parts, and the cross-section of the center hole is centrally symmetrical with respect to the center line o1. The center hole passes through between the two ends of the shaft parts, and the inner wall surface of the center hole is provided with an internal thread. The internal thread can extend continuously between the two ends of the shaft parts, or can extend intermittently between the two ends of the shaft parts, or can be provided only in a local area of the center hole of the shaft parts 01. The internal thread grinder of the embodiment of the present invention is used to grind these internal threads.

[0034] The directional terms "horizontal", "transverse", "vertical" and "longitudinal" involved in the present invention are all relative definitions with respect to the extension direction of the center line o1 of the shaft parts, rather than the absolute positioning direction. That is to say, when the shaft parts are rotationally supported by the parts support mechanism, the center line o1 of the shaft parts can be parallel to the horizontal ground (horizontal grinder), or perpendicular to the horizontal ground (vertical grinder), or at an inclined angle to the horizontal ground, but the "transverse", "vertical" and "longitudinal" directions are kept orthogonal to each other, the center line o1 is parallel to the "horizontal" direction, the center line o1 is consistent with the "transverse", the center line o1 is orthogonal to the "longitudinal" direction and are both parallel to the "horizontal" direction, and the center line o1 is orthogonal to the "vertical".

[0035] As mentioned above, the internal thread grinding method of the prior art has low working efficiency and is not suitable for internal thread grinding of shaft parts with large aspect ratio. The internal thread grinding machine proposed in the embodiment of the present invention at least partially solves the above problems. Figure 17 to 8 illustrate the structure and working principle of the internal thread grinder according to the horizontal exemplary embodiment of the present invention. As mentioned above, the structure and working principle of the embodiment of the present invention are also applicable to the vertical working mode. Figure 1-Figure 3 As shown, the internal thread grinding machine of the embodiment of the present invention generally includes a bed 10, a workbench 20, a part support mechanism 30, a grinding mechanism 40 and a controller. The workbench 20 and the grinding mechanism 40 are both arranged on the bed 10. The part support mechanism 30 is arranged on the workbench 20 and is used to rotationally support the shaft part 01 so that the shaft part 01 can rotate around the center line o1; the grinding mechanism 40 is arranged on both sides of the workbench 20, so that when the internal thread of the shaft part 01 is ground, the grinding rod 42 of the grinding mechanism 40 can simultaneously extend into the center hole from both sides. The controller is electrically connected to the part support mechanism 30 and the main shaft 41 of the grinding mechanism, and is used to control the part support mechanism 30 to drive the shaft part to rotate and feed, and to control the main shaft 41 to drive the grinding rod 42 and the grinding wheel 43 to rotate and feed.

[0036] In one embodiment, the part support mechanism 30 may be a clamping structure, such as a chuck-like component, which is clamped in the middle area of the shaft-like part 01 by the clamping structure and driven to rotate around the center line o1, so that both ends of the shaft-like part 01 are exposed. The two ends of the shaft-like part 01 can be retracted and hidden in the part support mechanism 30, or extended from the part support mechanism 30, as long as the grinding rod 42 of the grinding mechanism 40 can be extended into the center hole of the shaft-like part 01 from the exposed two ends. In another embodiment, the part support mechanism 30 may also be a roller structure, which supports the shaft-like part 01 by the roller and drives it to rotate around the center line o1, so that both ends of the shaft-like part 01 are exposed. In one embodiment, as Figure 1-Figure 3 As shown, the number of grinding mechanisms 40 can be two, and the two grinding mechanisms 40 are respectively arranged on both sides of the workbench 20. Each grinding mechanism 40 is used to align one end of the shaft component 01 and extend into the center hole. In another embodiment, the number of grinding mechanisms 40 can also be three, four, or more. The grinding mechanisms 40 can be arranged on both sides of the workbench 20 in any manner, as long as at least two grinding mechanisms 40 can simultaneously align both ends of the shaft component 01.

[0037] In one embodiment, the grinding mechanism 40 includes a main shaft 41, a grinding rod 42, and a grinding wheel 43. The grinding rod 42 extends from the main shaft 41, and a grinding wheel 43 is provided at the free end of the grinding rod 42. The main shaft 41 is driven to drive the grinding rod 42 and the grinding wheel 43 to rotate as a whole, and the shaft part 01 is driven to rotate by the part support mechanism 30. When performing the internal thread grinding action, the grinding rod 42 moves relative to the shaft part 01 along the center line o1 (marked as "horizontal" in the figure), so that the grinding wheel 43 can traverse the entire internal thread travel range of the shaft part 01. When performing the internal thread grinding action, the grinding wheel 42 is also controlled to move along the radial feed of the shaft part 01 to grind the internal thread.

[0038] In one embodiment, the grinding mechanism 40 is provided with an angle adjustment structure (not shown in the figure). While keeping the angle of the center line o1 of the shaft part 01 unchanged, the angle of the grinding rods 42 on both sides is adjusted so that the center lines o2 of the grinding rods 42 on both sides have the same angle relative to the center line o1, thereby grinding the thread surface with an inclined thread profile angle. In another embodiment, the part support mechanism 30 can also be provided with an angle adjustment structure (not shown in the figure). While keeping the angle of the center line o2 of the grinding rods 42 on both sides unchanged, the angle of the shaft part 01 is adjusted so that the center lines o2 of the grinding rods 42 on both sides have the same angle relative to the center line o1, which can also be applied to the thread profile angle. In another embodiment, the angles of the grinding rods 42 on both sides of the grinding mechanism 40 can be adjusted.

[0039] In one embodiment, during the grinding process, in order to enable the grinding wheel 43 to move within the thread stroke range in the center hole of the shaft part 01, only the workbench 20 is set to be able to feed and move horizontally along the center line o1 direction of the shaft part 01 (shown as "horizontal" in the figure), or only the grinding mechanisms 40 on both sides are set to be able to feed and move horizontally along the center line o1 direction of the shaft part 01, or both the workbench 20 and the grinding mechanism 40 are set to be able to feed and move horizontally along the center line o1 direction of the shaft part 01.

[0040] In one embodiment, in order to facilitate the horizontal alignment of the center line o1 of the shaft part 01 with the grinding rods 42 of the grinding mechanisms 40 on both sides of the workbench 20, only the workbench 20 is set to be able to move horizontally in a direction perpendicular to the center line o1 of the shaft part 01 (shown as "longitudinal" in the figure), or only the grinding mechanisms 40 on both sides are set to be able to move horizontally in a direction perpendicular to the center line o1 of the shaft part 01, or both the workbench 20 and the grinding mechanism 40 are set to be able to move horizontally in a direction perpendicular to the center line o1 of the shaft part 01.

[0041] In one embodiment, in order to facilitate the vertical alignment of the center line o1 of the shaft part 01 with the grinding rods 42 of the grinding mechanisms 40 on both sides of the workbench 20, the grinding mechanisms 40 on both sides are configured to be movable in the vertical direction (shown as "vertical" in the figure).

[0042] In one embodiment, Figure 4 As shown, if the grinding wheels 43 of the grinding mechanism 40 on both sides of the workbench 20 for simultaneously grinding the shaft parts 01 have the same coarse and fine sand particles, the grinding wheel with coarser sand particles can first grind a section of the internal thread, and then the grinding wheel with finer sand particles will fine-grind the rough-ground internal thread section. There is a period of working time in this process, that is, the grinding wheel rough-grinds the unground internal thread, and the rough-ground internal thread is simultaneously fine-grinded by another grinding wheel, thereby improving the grinding work efficiency.

[0043] In another embodiment, if Figure 4 As shown, if the grinding wheels 43 on both sides of the workbench 20 have the same grit, the grinding operating ranges of each grinding wheel 43 can be non-overlapping. That is, the internal threads to be ground are distributed to the grinding wheels 43 on both sides. Since the pair of grinding wheels 43 simultaneously grind different sections of the internal threads for at least a period of time, grinding efficiency is improved. In this case, since both grinding wheels 43 can start grinding from any position between the two ends of the shaft part, the grinding wheel's extreme grinding position does not need to extend to the other end of the shaft part away from it. This also eliminates the need to make the grinding rod longer, avoiding the problem of deformation caused by the grinding rod being subjected to an excessively large load arm.

[0044] In one embodiment, the part support mechanism 30 and the workbench 20 are connected in a relatively rotatable manner, such as Figure 3 As shown, the part support mechanism 30 can rotate about the vertical axis x relative to the worktable 20, thereby driving the shaft part 01 to rotate about the axis x, allowing the shaft part 01 to rotate in the horizontal plane. For example, the rotation range of the part support mechanism 30 is set to 180 degrees, ensuring that the two ends of the shaft part 01 can be switched between the grinding rod 42 workstations of the grinding mechanism 40 on both sides.

[0045] The controller is used to control the part support mechanism 30 to drive the shaft part to rotate. When performing the internal thread grinding operation, the controller controls the grinding rods of a pair of opposing grinding mechanisms to feed relative to the shaft part. Here, "relative" means that the grinding rods of the pair of grinding mechanisms on both sides of the workbench can simultaneously extend into the center hole of the shaft part from both ends and grind the internal thread. In practice, the axes of the grinding rods of the pair of grinding mechanisms do not coincide with the rotation axis x of the shaft part. The axes of the grinding rods of the pair of grinding mechanisms can also coincide or not coincide with each other. When the axes of the grinding rods of the pair of grinding mechanisms coincide with each other, the grinding contact points of their grinding wheels and the internal thread are located on the same side of the circular cross-section of the center hole. When the axes of the grinding rods of the pair of grinding mechanisms do not coincide with each other, the grinding contact points of their grinding wheels and the internal thread are located on different sides of the circular cross-section of the center hole.

[0046] In one embodiment, when performing the internal thread grinding operation, the controller controls the pair of grinding wheels to stop at the grinding starting point close to each other, and controls the pair of grinding wheels to move away from each other to the grinding end point. Figure 5a As shown, the grinding starting point can be set in the middle area of the shaft part, so as to minimize the length of a pair of grinding rods, such as Figure 5b As shown, the grinding endpoints can be set at the two ends of the shaft part. It should be noted that the "middle area" is not the ideal midpoint along the length of the center hole. Since the thread surface of the internal thread cannot be located at the ideal midpoint, and since both grinding wheels cannot be located at the ideal midpoint at the same time, the "middle area" is only the area near the ideal midpoint, as long as the length of the grinding rod required to be prepared can be minimized. Those skilled in the art will understand that in this embodiment, the grinding starting point can also be any position between the two ends of the shaft part, and the grinding endpoint is associated with the starting point of the internal thread.

[0047] In another embodiment, when performing the internal thread grinding operation, the controller controls the pair of grinding wheels to stop at the grinding starting point away from each other, and controls the pair of grinding wheels to move toward each other to the grinding end point. Figure 6a As shown, the grinding starting point can be set at the two ends of the shaft parts, such as Figure 6b As shown, the grinding end point can be set in the middle area of the shaft part, thereby minimizing the length of the pair of grinding rods. Those skilled in the art will understand that in this embodiment, the grinding starting point is associated with the starting point of the internal thread, and the grinding end point can also be any position between the two ends of the shaft part.

[0048] exist Figure 5a 、 Figure 5b 、 Figure 6a and Figure 6bIn the illustrated embodiment, the grinding wheels of a pair of opposing grinding rods can have the same grit coarseness. In this case, each grinding wheel completes internal thread grinding as it moves from the grinding starting point to the grinding end point. Alternatively, the grinding wheels of a pair of opposing grinding rods can have grit coarseness. In this case, after each grinding wheel moves from the grinding starting point to the grinding end point, only a portion of the internal thread is rough-ground. The part support mechanism 30 rotates about the vertical rotation axis x relative to the worktable 20, thereby switching the two ends of the shaft part 01 between the pair of opposing grinding rod stations and controlling one grinding rod to fine-grind the rough-ground internal thread portion.

[0049] In one embodiment, when performing the internal thread grinding operation, the controller controls the pair of grinding wheels to stop at the grinding starting point close to each other, and controls the pair of grinding wheels to move synchronously to the grinding end point while maintaining the close state. This situation is applicable to the case where the grinding wheels of a pair of opposite grinding rods have different coarse and fine grits. For example, Figure 7a As shown, the grinding starting point can be set at one end of the shaft part, such as Figure 7b As shown, the grinding end point can be set at the other end of the shaft part. In the figure, the right grinding wheel has coarser sand grains, and the left grinding wheel has finer sand grains. During the movement of the grinding wheel from the grinding starting point to the grinding end point, the right grinding wheel first coarsely grinds the internal thread, and the left grinding wheel simultaneously completes the fine grinding.

[0050] In one embodiment, each grinding wheel can be fed continuously or intermittently, moving, stopping, and then moving again, as it moves from the grinding start point to the grinding end point. With this arrangement, when the grinding wheels of a pair of opposing grinding rods need to grind different internal thread strokes, the controller can control the grinding wheel with the longer stroke to move continuously, while controlling the grinding wheel with the shorter stroke to move intermittently, thereby ensuring that both grinding wheels reach their respective grinding end points and stop grinding simultaneously. This ensures that both grinding wheels can simultaneously apply grinding load forces to the shaft component, thereby creating a load balance between the grinding load force application locations of the two grinding wheels and the support force provided by the component support mechanism to the shaft component, thereby improving the rotational support stability of the shaft component during the grinding process.

[0051] The description of the embodiments herein and any references to directions and orientations are for ease of description only and are not to be construed as limiting the scope of the present invention. The description of the preferred embodiments may involve combinations of features, which may exist independently or in combination. The present invention is not specifically limited to the preferred embodiments. The scope of the present invention is defined by the claims.

[0052] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An internal thread grinder for grinding internal threads of shaft parts, wherein the shaft parts are formed with a through center hole, and the internal threads are arranged on the inner surface of the center hole around the center line of the center hole, characterized in that: The internal thread grinder includes a bed, a workbench, a part support mechanism, at least two grinding mechanisms and a controller. The workbench and the at least two grinding mechanisms are all arranged on the bed, and the grinding mechanisms are respectively arranged on both sides of the workbench. The part support mechanism is arranged on the workbench, and the shaft parts are supported by the part support mechanism for rotation around their center lines and are exposed at both ends. Each grinding mechanism is provided with a grinding rod extending toward the part support mechanism, so that a pair of relative grinding rods arranged on both sides of the workbench can extend from both ends of the shaft parts into the center hole to grind the internal thread, wherein the controller is used to control the part support mechanism to drive the shaft parts to rotate around their center lines, and control the pair of relative grinding rods to move relative to the shaft parts to perform the internal thread grinding action, and the internal thread grinding action is: a pair of relative grinding rods extend into the center hole from both ends of the shaft parts to synchronously grind the internal thread, and the grinding wheels of the pair of relative grinding rods move at least along the center line direction from their respective grinding starting points to the grinding end points to complete the internal thread grinding process.

2. The internal thread grinding machine according to claim 1, characterized in that The grinding wheels of the pair of opposite grinding rods move at least along the center line direction from respective grinding starting points approaching each other to grinding end points away from each other to complete the internal thread grinding process.

3. The internal thread grinding machine according to claim 2, characterized in that The grinding starting point is located in the middle area of the center hole of the shaft part, and the grinding end points are respectively located in the two end areas of the center hole of the shaft part.

4. The internal thread grinding machine according to claim 1, characterized in that The grinding wheels of the pair of opposite grinding rods move at least along the center line direction from respective grinding starting points that are away from each other to respective grinding end points that are close to each other to complete the internal thread grinding process.

5. The internal thread grinding machine according to claim 4, characterized in that: The grinding end point is located in the middle area of the center hole of the shaft part, and the grinding starting points are located at the two ends of the center hole of the shaft part.

6. The internal thread grinding machine according to claim 1, characterized in that The pair of opposite grinding rods have grinding wheels with the same grit; or, the pair of opposite grinding rods have grinding wheels with different grit.

7. The internal thread grinding machine according to claim 6, characterized in that When the pair of opposite grinding rods have grinding wheels with different coarse and fine grits, the grinding wheels of the pair of opposite grinding rods move in at least the same direction along the center line direction, so that the internal thread is ground successively by the grinding wheels of the pair of opposite grinding rods with coarser grits and the grinding wheels of the pair of opposite grinding rods with finer grits.

8. An internal thread grinding machine according to any one of claims 1 to 7, wherein the pair of opposing grinding rods have grinding wheels with different coarse and fine grits. The parts supporting mechanism is rotatably arranged on the workbench around a rotating shaft extending in a vertical direction, so that the two ends of the shaft parts can be rotated in a horizontal plane, thereby switching between the pair of opposite grinding rod stations.

9. The internal thread grinding machine according to claim 1, characterized in that The part support mechanism and / or the grinding mechanism is provided with an angle adjustment structure, so that an angle is formed between the grinding rod and the center line of the shaft part, so that the grinding rod can adapt to the thread profile angle of the internal thread.

10. The internal thread grinding method according to claim 1, wherein: During the synchronous internal thread grinding process, any one of the pair of opposing grinding rods is moved continuously, reciprocatingly, or intermittently from the grinding start point to the grinding end point.

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