Internal thread grinding machine

Abstract

The utility model provides an internal thread grinding machine which is used for grinding an internal thread of a shaft part, a through center hole is formed in the shaft part, the internal thread is arranged on the inner surface of the center hole, the internal thread grinding machine comprises a machine body, a working table, a part supporting mechanism and at least two grinding mechanisms, and the working table and the at least two grinding mechanisms are all arranged on the machine body. The at least two grinding mechanisms are arranged on the two sides of the workbench respectively, the part supporting mechanism is arranged on the workbench, a shaft part is rotationally supported by the part supporting mechanism around the center line of the shaft part, the two ends of the shaft part are exposed, and each grinding mechanism is provided with a grinding rod extending towards the part supporting mechanism. Therefore, a pair of opposite grinding rods arranged on the two sides of the workbench can extend into the center hole from the two ends of the shaft part to grind the internal threads. According to the internal thread grinding device, the internal thread grinding machining efficiency is improved, and the internal thread grinding device can be well suitable for internal thread grinding of shaft parts with the large length-diameter ratio.

Description

Internal thread grinding machine Technical Field

[0001] This utility model relates to the field of metal cutting machine tool technology, and in particular to an internal thread grinding machine. Background Technology

[0002] Internal thread grinding is a key process step in the machining of shaft parts. Current technology typically uses a chuck to clamp one end of the shaft part, allowing a grinding wheel to extend into the center hole from the other end to complete the internal thread grinding. However, this method uses a single grinding wheel to complete the entire internal thread grinding, resulting in low grinding efficiency. Furthermore, when applied to internal thread grinding of shaft parts with large length-to-diameter ratios, the grinding wheel needs to be manufactured to be at least longer than the shaft part. An excessively long grinding wheel is prone to deformation due to the large grinding load arm, affecting the grinding accuracy of internal threads on shaft parts with large length-to-diameter ratios. Summary of the Invention

[0003] This utility model provides an internal thread grinding machine.

[0004] Specifically, this utility model is achieved through the following technical solution:

[0005] This utility model provides an internal thread grinding machine for grinding the internal threads of shaft parts. The shaft parts have a through-hole, and the internal thread is disposed on the inner surface of the through-hole. The internal thread grinding machine includes a bed, a worktable, a part support mechanism, and at least two grinding mechanisms. The worktable and at least two grinding mechanisms are all disposed on the bed. The grinding mechanisms are respectively arranged on both sides of the worktable. The part support mechanism is disposed on the worktable. The shaft parts are rotatably supported by the part support mechanism around their center line and are in a state with both ends exposed. Each grinding mechanism is provided with a grinding rod extending toward the part support mechanism, so that a pair of opposing grinding rods arranged on both sides of the worktable can extend from both ends of the shaft parts into the through-hole to grind the internal thread.

[0006] In some embodiments, the part support mechanism is rotatably mounted on the worktable about a vertically extending shaft, so that the positions of both ends of the shaft part can rotate in a horizontal plane, thereby switching between the grinding rod positions of at least two grinding mechanisms.

[0007] In some embodiments, the part support mechanism and / or grinding mechanism are provided with an angle adjustment structure, thereby forming an angle between the grinding rod and the centerline of the shaft-type part.

[0008] In some embodiments, the worktable can move horizontally along the centerline of the shaft-type part.

[0009] In some embodiments, the worktable can move horizontally along a direction perpendicular to the centerline of the shaft-type part.

[0010] In some embodiments, at least two grinding mechanisms are capable of moving horizontally along a direction perpendicular to the centerline of the shaft-type part.

[0011] In some embodiments, at least two grinding mechanisms are capable of moving horizontally along the centerline of the shaft-type part.

[0012] In some embodiments, at least two grinding mechanisms are capable of moving in a vertical direction.

[0013] In some embodiments, the grinding rods of at least two grinding mechanisms have grinding wheels with the same grit size.

[0014] In some embodiments, the grinding rods of at least two grinding mechanisms have grinding wheels with different grit sizes.

[0015] According to the embodiments of this utility model, the shaft part is exposed at both ends, and the grinding rods of a pair of opposing grinding mechanisms can be inserted into the central hole from both ends of the shaft part. The internal threads of the shaft part can be ground synchronously by the two grinding mechanisms at the same time, which improves the grinding efficiency of internal threads. Furthermore, the grinding rod of each grinding mechanism does not need to be made longer than the length of the shaft part, which greatly reduces the grinding load arm that the grinding rod needs to bear. This makes the internal thread grinding machine well applicable to the internal thread grinding of shaft parts with a large length-to-diameter ratio.

[0016] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

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

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

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

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

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

[0022] Figure label:

[0023] 01: Shaft parts; 10: Bed; 20: Worktable; 30: Part support mechanism; 40: Grinding mechanism; 41: Spindle; 42: Grinding rod; 43: Grinding wheel. Detailed Implementation

[0024] 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, and are not intended to imply any limitation on the scope of the present invention.

[0025] As used herein, the term "comprising" 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"; the term "another embodiment" is to be interpreted as "at least one other embodiment"; the terms "first," "second," etc., may refer to different or the same objects; the term "setup" is not limited to direct or indirect connections, nor to specific connection methods. Other explicit and implicit definitions may also be included below.

[0026] Specific numerical values ​​or ranges may be mentioned in the following description. It should be understood that these values ​​and ranges are merely exemplary and may be helpful in putting the ideas of this invention into practice. However, the description of these examples is not intended to limit the scope of this invention in any way. These values ​​or ranges may be set differently depending on the specific application scenario and requirements.

[0027] The shaft-like parts mentioned in this embodiment of the utility model can be circular or non-circular shafts with uniform cross-section, stepped shafts with variable cross-section, or tapered shafts with variable cross-section. Each shaft-like part has a centerline o1, extending its length along the centerline o1. A central hole is formed within the shaft-like part, and the cross-section of the central hole is centrally symmetrical with respect to the centerline o1. The central hole passes through both ends of the shaft-like part, and an internal thread is provided on the inner wall surface of the central hole. The internal thread can extend continuously between the two ends of the shaft-like part, extend intermittently between the two ends, or be provided only in a localized area of ​​the central hole of the shaft-like part o1. The internal thread grinding machine of this embodiment of the utility model is used to grind these internal threads.

[0028] The directional terms "horizontal," "lateral," "vertical," and "longitudinal" involved in this utility model are relative definitions relative to the extension direction of the centerline o1 of the shaft part, rather than absolute positioning directions. That is to say, when the shaft part is rotated and supported by the part support mechanism, the centerline o1 of the shaft part can be parallel to the horizontal ground (horizontal grinding machine), perpendicular to the horizontal ground (vertical grinding machine), or inclined at an angle to the horizontal ground. However, "lateral," "vertical," and "longitudinal" are mutually orthogonal. The centerline o1 is parallel to the "horizontal" direction, the centerline o1 is consistent with the "lateral" direction, the centerline o1 is orthogonal to the "longitudinal" direction and is parallel to the "horizontal" direction, and the centerline o1 is orthogonal to the "vertical" direction.

[0029] As mentioned above, the existing internal thread grinding methods have low working efficiency and are not suitable for grinding internal threads of shaft parts with large length-to-diameter ratios. The internal thread grinding machine proposed in the embodiments of this utility model at least partially solves the above problems. The structure and working principle of the internal thread grinding machine of the horizontal example embodiment of this utility model will be described below with reference to Figures 1 to 4. As mentioned before, the structure and working principle of the embodiment of this utility model are also applicable to the vertical working mode. As shown in Figures 1 to 3, the internal thread grinding machine of the embodiment of this utility model generally includes a bed 10, a worktable 20, a part support mechanism 30, and a grinding mechanism 40. The worktable 20 and the grinding mechanism 40 are both arranged on the bed 10. The part support mechanism 30 is arranged on the worktable 20 and is used to provide rotational support for 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 worktable 20, so that when grinding the internal thread of the shaft part 01, the grinding rod 42 of the grinding mechanism 40 can simultaneously extend into the center hole from both sides.

[0030] In one embodiment, the part support mechanism 30 can be a gripper structure, such as a chuck-like component, which clamps the shaft part 01 in the middle region and drives it to rotate around the center line o1, thereby exposing both ends of the shaft part 01. The ends of the shaft part 01 can be hidden within the part support mechanism 30 or extend from it, as long as the grinding rod 42 of the grinding mechanism 40 can extend into the center hole of the shaft part 01 from the exposed ends. In another embodiment, the part support mechanism 30 can also be a roller structure, which supports the shaft part 01 and drives it to rotate around the center line o1, thereby exposing both ends of the shaft part 01.

[0031] In one embodiment, as shown in Figures 1-3, the number of grinding mechanisms 40 can be two, with the two grinding mechanisms 40 respectively arranged on both sides of the worktable 20. Each grinding mechanism 40 is used to align one end of the shaft part 01 and extend into the central 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 worktable 20 in any way, as long as it is ensured that the grinding rods of at least one pair of grinding mechanisms 40 can be opposite each other and simultaneously aligned with both ends of the shaft part 01.

[0032] It should be noted that "relative" means that the grinding rods of a pair of grinding mechanisms on both sides of the worktable can simultaneously extend into the central hole from both ends of the shaft part and grind the internal thread. In reality, the axes of the grinding rods of a pair of grinding mechanisms do not coincide with the axis of rotation x of the shaft part. The axes of the grinding rods of a pair of grinding mechanisms may coincide or not coincide. When the axes of the grinding rods of a pair of grinding mechanisms coincide, the grinding contact point between the grinding wheel and the internal thread is located on the same side of the circular cross-section of the central hole. When the axes of the grinding rods of a pair of grinding mechanisms do not coincide, the grinding contact point between the grinding wheel and the internal thread is located on different sides of the circular cross-section of the central hole.

[0033] In one embodiment, the grinding mechanism 40 includes a spindle 41, a grinding rod 42, and a grinding wheel 43. The grinding rod 42 extends from the spindle 41, and the grinding wheel 43 is provided at the free end of the grinding rod 42. The spindle 41 drives the grinding rod 42 and the grinding wheel 43 to rotate as a whole. The shaft part 01 is driven to rotate by the part support mechanism 30. The grinding rod 42 moves relative to the shaft part 01 along the center line o1 (marked as "lateral" in the figure), thereby using the grinding wheel 43 to grind the internal thread of the shaft part 01.

[0034] In one embodiment, the grinding mechanism 40 is provided with an angle adjustment structure (not shown in the figure). While keeping the centerline o1 of the shaft part 01 constant, the angles of the grinding rods 42 on both sides are adjusted so that the centerlines o2 of the grinding rods 42 on both sides have the same angle relative to the centerline o1, thereby grinding the inclined thread profile. In another embodiment, the part support mechanism 30 may also be provided with an angle adjustment structure (not shown in the figure). While keeping the centerline o2 of the grinding rods 42 on both sides constant, the angle of the shaft part 01 is adjusted so that the centerlines o2 of the grinding rods 42 on both sides have the same angle relative to the centerline o1, which can also be used to grind the inclined thread profile. In another embodiment, the angles of both grinding rods 42 on both sides of the grinding mechanism 40 may be adjustable.

[0035] In one embodiment, during the grinding process, in order to enable the grinding wheel 43 to move within the threaded stroke range in the central hole of the shaft part 01, only the worktable 20 can be configured to move horizontally along the center line o1 of the shaft part 01 (shown as "lateral" in the figure), or only the grinding mechanisms 40 on both sides can be configured to move horizontally along the center line o1 of the shaft part 01, or both the worktable 20 and the grinding mechanism 40 can be configured to move horizontally along the center line o1 of the shaft part 01.

[0036] In one embodiment, to facilitate the alignment of the centerline o1 of the shaft part 01 with the grinding rods 42 of the grinding mechanisms 40 on both sides of the worktable 20 in the horizontal direction, only the worktable 20 is configured to be able to move horizontally along the direction perpendicular to the centerline o1 of the shaft part 01 (shown as "longitudinal" in the figure). Alternatively, only the grinding mechanisms 40 on both sides can be configured to be able to move horizontally along the direction perpendicular to the centerline o1 of the shaft part 01. Or, both the worktable 20 and the grinding mechanisms 40 can be configured to be able to move horizontally along the direction perpendicular to the centerline o1 of the shaft part 01.

[0037] In one embodiment, to facilitate vertical alignment of the centerline o1 of the shaft part 01 with the grinding rods 42 of the grinding mechanisms 40 on both sides of the worktable 20, the grinding mechanisms 40 on both sides are configured to move vertically (shown as "vertical" in the figure). Those skilled in the art will understand that, during internal thread grinding, vertical or lateral movement can simultaneously be used to drive the grinding wheel 43 to move radially relative to the shaft part 01 for grinding the internal thread.

[0038] In one embodiment, the grinding wheels 43 of the grinding mechanism 40 on both sides of the worktable 20, which are used to simultaneously grind shaft-type parts 01, have the same grit size. Both grinding wheels 43 can simultaneously grind the internal threads in different areas of the central hole of the shaft-type parts 01, as shown in Figure 4. If the grit size of the grinding wheels 43 on both sides is the same, each grinding wheel 43 only needs to be extended to the midpoint of the central hole. During grinding, the two grinding wheels 43 move laterally from the midpoint to both ends to complete the grinding of all internal threads in the central hole. Those skilled in the art will understand that the above grinding feed method can minimize the load arm on the grinding rod 42. However, other grinding methods can also be used in the internal thread grinding machine of this embodiment. For example, in Figure 4, the grinding starting position of the left grinding wheel 43 is 1 / 3 of the distance from the left end, and the grinding starting position of the right grinding wheel 43 is also 1 / 3 of the distance from the left end. In this case, the load arm on the right grinding rod 42 is larger.

[0039] In one embodiment, the grinding wheels 43 of the grinding mechanisms 40 on both sides of the worktable 20, which are used to simultaneously grind shaft-type parts 01, have different grit sizes. This allows the grinding rods 42 of both grinding mechanisms 40 to simultaneously perform rough and fine grinding on the internal threads of the shaft-type parts 01. For example, as shown in FIG4, the left grinding wheel 43 is used for rough grinding, and the right grinding wheel 43 is used for fine grinding. The left grinding wheel 43 is controlled to move laterally to the left relative to the center hole of the shaft-type part 01, while the right grinding wheel 43 is also controlled to move laterally to the left relative to the center hole of the shaft-type part 01. This allows the internal thread area that has just been rough ground by the left grinding wheel 43 to be immediately finely ground by the right grinding wheel 43, improving the efficiency of internal thread grinding. Those skilled in the art will understand that although the above grinding method can improve the efficiency of internal thread grinding, in the use of the internal thread grinding machine of this embodiment, the left grinding wheel 43 is first used for rough grinding of the internal threads and then stopped before the right fine grinding wheel 43 is started to rotate for fine grinding of the internal threads.

[0040] In one embodiment, the part support mechanism 30 is rotatably connected to the worktable 20, as shown in FIG3. The part support mechanism 30 can rotate relative to the worktable 20 about a vertical axis x, thereby driving the shaft part 01 to rotate about the axis x, so that the shaft part 01 can rotate in a horizontal plane. For example, the rotation range of the part support mechanism 30 is set to 180 degrees, thereby ensuring that the positions of the two ends of the shaft part 01 can be switched between the grinding rod 42 positions of the grinding mechanisms 40 on both sides. When using the internal thread grinding machine of this embodiment, for example, the left side of the worktable 20 is set with a coarse grinding wheel 43, and the right side is set with two grinding mechanisms 40, a coarse grinding wheel 43 and a fine grinding wheel 43. After the coarse grinding of the thread in the left area of ​​the shaft part 01 in the figure is completed, the part support mechanism 30 is rotated to switch the left end of the shaft part 01 to the right side. Then, by adjusting the longitudinal position of the part support mechanism 30, the fine grinding wheel 43 on the right side is used to continue the fine grinding of the internal thread.

[0041] The description of the embodiments herein, including any references to directions and orientations, is for ease of description only and should not be construed as limiting the scope of protection of this utility model. The description of preferred embodiments involves combinations of features, which may exist independently or in combination; this utility model is not particularly limited to the preferred embodiments. The scope of this utility model is defined by the claims.

[0042] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. An internal thread grinding machine for grinding internal threads on shaft-type parts, the shaft-type parts having a through-hole central hole, the internal thread being disposed on the inner surface of the central hole, characterized in that, The internal thread grinding machine includes a bed, a worktable, a part support mechanism, and at least two grinding mechanisms. The worktable and the at least two grinding mechanisms are both mounted on the bed. The grinding mechanisms are respectively arranged on both sides of the worktable. The part support mechanism is mounted on the worktable. The shaft-like part is rotatably supported by the part support mechanism about its center line and is in a state with both ends exposed. Each grinding mechanism is provided with a grinding rod extending toward the part support mechanism, so that a pair of opposing grinding rods arranged on both sides of the worktable can extend from both ends of the shaft-like part into the center hole to grind the internal thread.

2. The box thread grinder of claim 1 wherein, The part support mechanism is rotatably mounted on the worktable about a vertically extending shaft, allowing the two ends of the shaft-type part to rotate in a horizontal plane, thereby switching between the grinding rod positions of at least two grinding mechanisms.

3. The box thread grinder of claim 1 wherein, The part support mechanism and / or grinding mechanism are equipped with an angle adjustment structure, so that an angle is formed between the grinding rod and the centerline of the shaft part.

4. The female thread grinder of claim 1, wherein, The worktable can move horizontally along the centerline of shaft-type parts.

5. The female thread grinder of claim 1, wherein, The worktable can move horizontally along a direction perpendicular to the centerline of shaft-type parts.

6. The female thread grinder of claim 1, wherein, At least two grinding mechanisms are capable of moving horizontally along a direction perpendicular to the centerline of the shaft-type part.

7. The female thread grinder of claim 1, wherein, At least two grinding mechanisms are capable of moving horizontally along the centerline of shaft-type parts.

8. The internal thread grinding machine according to claim 1, characterized in that, At least two grinding mechanisms are capable of moving in the vertical direction.

9. The female thread grinder of claim 1, wherein, At least two grinding mechanisms have grinding wheels with the same grit size on their grinding rods.

10. The female thread grinder of claim 1, wherein, At least two grinding mechanisms have grinding wheels with different grit sizes on their grinding rods.

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