External thread grinding machine

Abstract

The utility model provides an external thread grinding machine, each head and tail frame is provided with a servo motor and a clamping device, the clamping devices are driven by the servo motors to rotate, and the pair of head and tail frames are arranged oppositely and respectively clamp and fix two ends of a shaft part through the clamping devices. At least one head-tail frame is movably arranged on the lathe bed through a sliding frame in the axial direction of the shaft part, so that the positions, far away from and close to each other, of the pair of head-tail frames can be adjusted in the axial direction of the shaft part, and a driver is arranged on at least one head-tail frame; the driver can drive the pair of head and tail frames to move in the axial direction of the shaft part in the direction away from each other. According to the external thread grinding device, external thread grinding is carried out on the shaft part in the state that the shaft part is axially stretched, center holes do not need to be machined in the two ends of the shaft part in advance, meanwhile, instability and deformation of the shaft part are avoided, and the external thread grinding precision is guaranteed.

Description

Technical Field

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

[0002] External thread grinding is a key process step in the machining of shaft parts. Current technology involves setting center structures on the headstock and tailstock to form center holes at both ends of the shaft part. The external threads are ground by utilizing the fit between the center structures and the countersunk holes, with the shaft workpiece being axially clamped from both ends. However, pre-machining the center holes complicates the process, and errors in the center hole machining can affect the grinding accuracy of the external threads. For small-diameter shaft parts with a diameter of less than 2mm, machining the center holes is extremely difficult. Furthermore, for shaft parts with a large length-to-diameter ratio, the axial clamping method can easily cause instability and deformation, significantly reducing the yield rate. Utility Model Content

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

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

[0005] This utility model provides an external thread grinding machine for grinding the external threads of shaft parts. The external thread grinding machine includes a bed, a grinding mechanism, a driver, a carriage, and a pair of head and tailstocks. The grinding mechanism, the carriage, and the pair of head and tailstocks are all mounted on the bed. Each head and tailstock is equipped with a servo motor and a clamping device. The clamping device is driven to rotate by the servo motor. The pair of head and tailstocks are arranged opposite to each other and clamp and fix the two ends of the shaft part respectively by the clamping device. At least one head and tailstock is movably mounted on the bed along the axial direction of the shaft part via the carriage, so that the position of the pair of head and tailstocks moving away from or closer to each other in the axial direction of the shaft part is adjustable. At least one head and tailstock is equipped with a driver, so that the driver can drive the pair of head and tailstocks to move away from or closer to each other in the axial direction of the shaft part.

[0006] In some embodiments, only one head and tail carriage is mounted on the bed frame via a slide; or, a pair of head and tail carriages are each mounted on the bed frame via a slide.

[0007] In some embodiments, the actuator includes a piston, the piston cylinder and piston rod of which are respectively connected to a carriage and a head and tail carriage, thereby driving a pair of head and tail carriages to move in the axial direction toward each other and toward each other by piston movement.

[0008] In some embodiments, the drive further includes an elastic element connected between the carriage and the head and tail carriages, such that the elastic element can accumulate elastic restoring force as the pair of head and tail carriages move toward each other in the axial direction, and can release elastic restoring force as the pair of head and tail carriages move away from each other in the axial direction.

[0009] In some embodiments, a guide mechanism is provided between the carriage and the head and tail frames, which can guide the relative movement between the carriage and the head and tail frames in the axial direction.

[0010] In some embodiments, the guiding mechanism includes a slider and a guide rail, the carriage is provided with a side plate, and the slider and guide rail are disposed between the side plate and the head and tail frames and are respectively connected to the side plate and the head and tail frames.

[0011] In some embodiments, a buffer structure is provided on the side plate to form a buffer between the headstock and tailstock and the carriage at the limit position of relative movement in the axial direction.

[0012] In some embodiments, the drive and guide mechanism are located on the same side of the head and tailstock.

[0013] In some embodiments, a driver is provided on only one headstock and tailstock; or, a driver is provided on both headstocks and tailstocks.

[0014] According to the embodiments of this utility model, a pair of head and tail clamps are used to clamp the two ends of the shaft part. The driver drives the pair of head and tail clamps to put the shaft part in an axially stretched state. The grinding mechanism performs external thread grinding, which eliminates the need to pre-machine center holes at both ends of the shaft part and avoids the shaft part from becoming unstable and deformed.

[0015] 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

[0016] 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.

[0017] Figure 1 This is a schematic diagram of an external thread grinding machine according to one embodiment of the present invention;

[0018] Figure 2 yes Figure 1 A magnified view of a section at point A in the middle;

[0019] Figure 3 This is a front view of an external thread grinding machine according to an embodiment of the present invention;

[0020] Figure 4This is a schematic diagram of the head and tail frame in one embodiment of the present invention.

[0021] Figure label:

[0022] 10: Bed; 20: Headstock and tailstock; 21: Clamp; 22: Servo motor; 30: Grinding mechanism; 40: Driver; 51: Base; 52: Side plate; 61: Slider; 62: Guide rail; 63: Connecting plate; 64: Buffer block. Detailed Implementation

[0023] 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.

[0024] 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.

[0025] 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.

[0026] As mentioned above, existing external thread grinding methods, which require pre-machining of a center hole, complicate the process. Errors in the center hole machining also affect the grinding accuracy. For small-diameter shaft parts, machining the center hole is difficult, and for shaft parts with a large length-to-diameter ratio, axial clamping can easily cause instability and deformation, resulting in low part yield. The external thread grinding machine proposed in the embodiments of this utility model at least partially solves the above problems. The following will refer to... Figure 1 to- Figure 4 This describes the structure and working principle of a horizontal external thread grinding machine according to an exemplary embodiment of the present invention. The structure and working principle of this embodiment are also applicable to vertical working methods. Figures 1-4As shown, the external thread grinding machine of this embodiment generally includes a bed 10, a grinding mechanism 30, a driver 40, a carriage, and a pair of head and tailstocks 20. It may also include other components of a conventional grinding machine, such as a hydraulic system, a cooling system, a grinding wheel changing mechanism, and a grinding wheel dressing mechanism. The grinding wheel of the grinding mechanism 30 is used to grind the external thread along the axial direction of the shaft-like part. The carriage is used to movably connect the head and tailstocks to the bed. The driver 40 is used to drive the pair of head and tailstocks 20 to move in a direction away from each other. The bed 10 is used to support the components of the grinding machine. The grinding mechanism 30 and the pair of head and tailstocks 20 are both mounted on the bed 10.

[0027] Each pair of head and tailstocks 20 is equipped with a servo motor 22 and a clamp 21. The clamp 21 is used to clamp and fix the end of the shaft part, and the servo motor 22 is used to drive the clamp 21 to rotate. By controlling the servo motors 22 of the pair of head and tailstocks 20 to rotate synchronously, the shaft part can be accurately driven to rotate around its own axis.

[0028] A pair of headstocks 20 are arranged aligned with each other on the bed 10. In one embodiment, the pair of headstocks 20 are each connected to the bed 10 via a carriage and a guide rail, so that each headstock 20 can move relative to the bed 10 along the guide rail, wherein the extension direction of the guide rail is aligned with the axial direction of the shaft component. In another embodiment, only one headstock 20 is connected to the bed 10 via a carriage and a guide rail, while the other headstock 20 is fixedly connected to the bed 10. In this case, adjusting the position of one headstock 20 can also achieve the purpose of adjusting the distance between the pair of headstocks 20. Exemplarily, the headstocks 20 are connected to the bed 10 via a carriage.

[0029] In one embodiment, an actuator 40 is provided on one headstock 20, and the actuator 40 is connected between the headstock 20 and the carriage. When the carriage is stationary, the actuator 40 is used to move the pair of headstocks 20 away from and towards each other, thereby achieving axial tension of the shaft-like parts. In another embodiment, actuators 40 are provided on each of the pair of headstocks 20, and the movement of the pair of headstocks 20 away from and towards each other can be achieved by using either one actuator 40 or by using both actuators 40 simultaneously.

[0030] In one embodiment, the actuator 40 is configured as a piston, with the piston cylinder and piston rod connected to the carriage and head and tail carriages 20, respectively. For example, Figure 4 As shown, the piston cylinder is fixed to the base 51 of the carriage, and the end of the piston rod is fixedly connected to the head and tail frames 20 (not shown in the figure), thereby driving the pair of head and tail frames 20 to move in the axial direction toward each other and toward each other through piston movement. In another example, the piston cylinder may also be fixed to the head and tail frames 20, and the end of the piston rod may be fixedly connected to the base 51 of the carriage.

[0031] In another embodiment, the actuator 40 consists of a piston and an elastic element connected between the carriage and the head and tail carriages 20. The piston drives the head and tail carriages 20 to move closer to each other. During this process, the elastic element accumulates elastic restoring force. When the two ends of the shaft part are clamped, the piston driving force is turned off, and the elastic restoring force of the elastic element is released, causing the pair of head and tail carriages 20 to move away from each other, thereby realizing the axial stretching action of the shaft part.

[0032] In one embodiment, a guide mechanism is provided between the carriage and the head and tail supports 20. The guide mechanism can guide the relative movement between the carriage and the head and tail supports 20 in the axial direction, thereby improving the accuracy of the stretching direction of the shaft parts and ensuring the machining accuracy of the external threads.

[0033] In one embodiment, the guiding mechanism includes a slider 61 and a guide rail 62. The carriage is provided with a base 51 and a sidewall. The slider 61 and the guide rail 62 are disposed between the sidewall and the head and tail frames 20 and are respectively connected to the sidewall and the head and tail frames 20. For example, Figure 4 As shown, multiple sliders 61 are arranged on the side of the head and tail carriages 20, and guide rails 62 are arranged on the side plate 52 to precisely guide the relative movement between the carriage and the head and tail carriages 20.

[0034] In one embodiment, a buffer structure is provided on the side plate 52 to buffer the headstock 20 from the extreme position of relative movement in the axial direction between it and the carriage. Exemplarily, the buffer mechanism includes a connecting plate 63 and a buffer block 64. The connecting plate 63 is disposed on the side plate 52 and extends towards the headstock 20, and the buffer block 64 is disposed at the extended end of the connecting plate 63, thereby preventing vibration or even deformation of shaft components due to rigid collision between the headstock 20 and the carriage.

[0035] In one embodiment, the drive 40 and the guide mechanism are located on the same side of the head and tail frame 20 to ensure that the load force generated by the drive 40 and the guide mechanism when they are in operation is balanced relative to the head and tail frame 20, thus preventing the head and tail frame 20 from twisting.

[0036] When using the external thread grinding machine of this invention, the moving carriage adjusts the distance between the pair of head and tailstocks to a suitable position. The driver then drives the pair of head and tailstocks to move away from each other in the axial direction of the shaft part, thus providing space for the shaft part. When the shaft part is placed in the predetermined position, the driver can drive the pair of head and tailstocks to move closer to each other until they reach the clamping position. After the shaft part is clamped and fixed by the clamping device, the driver again drives the pair of head and tailstocks to move away from each other, thereby completing the axial stretching of the shaft part and performing external thread grinding in this state.

[0037] 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.

[0038] 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 external thread grinding machine for grinding external threads on shaft-type parts, characterized in that, The external thread grinding machine includes a bed, a grinding mechanism, a driver, a carriage, and a pair of headstocks and tailstocks. The grinding mechanism, carriage, and pair of headstocks and tailstocks are all mounted on the bed. Each headstock and tailstock is equipped with a servo motor and a clamping device. The clamping device is driven to rotate by the servo motor. The pair of headstocks and tailstocks are arranged opposite to each other and clamp and fix the two ends of the shaft-like parts respectively by the clamping device. At least one headstock and tailstock is movably mounted on the bed along the axial direction of the shaft-like parts via the carriage, so that the position of the pair of headstocks moving away from or closer to each other in the axial direction of the shaft-like parts is adjustable. At least one headstock and tailstock is equipped with a driver, so that the driver can drive the pair of headstocks to move away from or closer to each other in the axial direction of the shaft-like parts.

2. The external thread grinding machine according to claim 1, characterized in that, Only one head and tail frame is mounted on the bed frame via a slide; or, a pair of head and tail frames are each mounted on the bed frame via slides.

3. The external thread grinding machine according to claim 2, characterized in that, The actuator includes a piston, the piston cylinder and piston rod of which are respectively connected to a carriage and a head and tail carriage, thereby driving a pair of head and tail carriages to move in the axial direction toward each other and toward each other through piston movement.

4. The external thread grinding machine according to claim 3, characterized in that, The drive also includes an elastic element connected between the carriage and the head and tail carriages, which allows the elastic element to accumulate elastic restoring force as the pair of head and tail carriages move toward each other in the axial direction, and to release elastic restoring force as the pair of head and tail carriages move away from each other in the axial direction.

5. The external thread grinding machine according to claim 2, characterized in that, A guide mechanism is provided between the carriage and the head and tail frames, which can guide the relative movement between the carriage and the head and tail frames in the axial direction.

6. The external thread grinding machine according to claim 5, characterized in that, The guiding mechanism includes a slider and a guide rail. The carriage is equipped with a side plate. The slider and guide rail are located between the side plate and the head and tail frames and are respectively connected to the side plate and the head and tail frames.

7. The external thread grinding machine according to claim 6, characterized in that, A buffer structure is provided on the side plate to form a buffer between the head and tail frames and the carriage at the limit position of relative movement in the axial direction.

8. The external thread grinding machine according to claim 5, characterized in that, The drive and guide mechanisms are located on the same side of the head and tailstock.

9. The external thread grinding machine according to claim 1, characterized in that, The drive is installed on only one headstock and tailstock; or, the drive is installed on both headstocks and tailstocks.

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