Camshaft machining and positioning device of numerical control lathe

Abstract

The utility model discloses a camshaft processing and positioning device for a numerical control lathe, which belongs to processing and production of the numerical control lathe and comprises a connecting cover arranged at the tail end of a spindle after a protective cover of the lathe is removed, a through hole is arranged in the middle of the top of the connecting cover, and a stepped shaft is arranged in the through hole. A front end, a middle end and a tail end are arranged on the stepped shaft in a stepped mode, the radiuses of the front end, the middle end and the tail end are sequentially increased, a fixing nut is arranged at the front end, the outer diameter of the middle end is matched with the inner diameter of a through hole of the connecting cover, and the length of the middle end is matched with the depth of the through hole. A plurality of collecting grooves used for collecting cuttings are formed in the surface of the blocking block in the axial direction, chip discharging grooves used for discharging the cuttings are formed in the surface of the blocking block in the annular direction, and the chip discharging grooves are circumferential annular grooves. The cam shaft positioning device can tightly abut against the end face of the cam shaft in the production process, limits axial movement of the cam shaft and plays a role in axial positioning.

Description

Technical Field

[0001] The utility model relates to the field of CNC lathe processing and production, in particular to a CNC lathe camshaft processing and positioning device. Background Art

[0002] CNC lathe is a high-precision, high-efficiency automated machine tool. Equipped with a multi-station turret or a power turret, the machine tool has a wide range of processing capabilities and can process linear cylinders, oblique cylinders, arcs, and various threads, grooves, worms and other complex workpieces. It is widely used in production. Generally, CNC lathes include a spindle, on which a three-jaw chuck for clamping workpieces is provided, a tool disc for mounting machining tools, and a tailstock for the top when making long axes.

[0003] When using a CNC lathe to process parts, after clamping the parts, use a three-jaw chuck to clamp the parts to complete the fixation of the parts. During the processing of the camshaft, due to the requirements of the axial size, the camshaft needs to be strictly positioned axially and cannot move. Because the existing lathe lacks an axial positioning device, the axial direction cannot be positioned, the coordinate zero point cannot be determined, and the axial direction may move during the processing, resulting in the generation of waste. When processing the next part, since it cannot be positioned, the end face must be cut and the zero point must be created, and the operation is redundant and complicated. At the same time, when processing the extended camshaft, the axial position of the camshaft cannot be brought close to the chuck end to reduce processing vibration. Therefore, there is an urgent need for a CNC lathe camshaft processing positioning device to help position and reduce the vibration of the workpiece during processing and improve the processing quality. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a camshaft processing positioning device for a CNC lathe, which can effectively tighten the camshaft in cooperation with a three-jaw chuck and a center, limit the axial movement of the camshaft, and play a role in axial positioning.

[0005] In order to solve the above technical problems, the technical solution adopted by the utility model is: a camshaft processing and positioning device for a CNC lathe, comprising a connecting cover arranged at the tail end of the spindle after the protective cover of the lathe is removed, a through hole is arranged in the middle of the top of the connecting cover, a stepped shaft is arranged in the through hole, and the stepped shaft is stepped with a front end, a middle end and a tail end with increasing radii in sequence, a fixing nut is arranged on the front end, the outer diameter of the middle end is matched with the inner diameter of the through hole of the connecting cover, and the length of the middle end is matched with the depth of the through hole, a positioning rod is fixedly arranged in the tail end, a blocking block is arranged at the tail of the positioning rod, the plane at the bottom of the blocking block is the positioning surface, a plurality of collecting grooves for collecting chips are arranged axially on the surface of the blocking block, and a chip removal groove for chip removal is arranged circumferentially on the surface of the blocking block.

[0006] A further improvement of the technical solution of the utility model is that: an external thread is arranged on the tail end of the main shaft, and an internal thread matching the external thread of the main shaft is arranged inside the connecting cover.

[0007] A further improvement of the technical solution of the utility model is that an external thread is arranged on one end of the positioning rod away from the blocking block, and an internal thread matching the external thread at the end of the positioning rod is arranged in the tail end of the stepped shaft.

[0008] A further improvement of the technical solution of the utility model is that an external thread adapted to the fixing nut is arranged on the bottom of the front end of the stepped shaft, and the front of the external thread is smooth.

[0009] A further improvement of the technical solution of the utility model is that the fixing nut is an external hexagonal nut.

[0010] A further improvement of the technical solution of the utility model is that the blocking block at the tail of the positioning rod is cylindrical and has a clearance fit with the main shaft hole in the main shaft, and the clearance is 1-2mm.

[0011] Due to the adoption of the above technical scheme, the technical progress achieved by the utility model is: by removing the protective cover and connecting the positioning device from the tail end of the spindle, it can effectively cooperate with the chuck and the center to achieve the production of the camshaft, so that the positioning surface of the block is pressed against the camshaft, limiting the axial movement of the camshaft, playing the role of axial positioning, thereby reducing vibration and improving processing quality. By arranging a collection groove and a chip discharge groove on the block, it is convenient to collect and discharge the chips generated by turning during the production process. By setting a stepped shaft, disassembly is also simple and fixed and stable. Setting a smooth surface and then a thread at the front end of the stepped shaft can effectively prevent the thread from being damaged and unable to be tightened, causing it to fall off. By setting a connecting cover as a device connected to the tail end of the spindle, not only can the positioning device be stably fixed in the spindle, but it is also easy to install and will not damage the spindle. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art are briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work.

[0013] Figure 1 It is a schematic diagram of the structure of the utility model;

[0014] Figure 2 It is a left view of the structure of the utility model;

[0015] Figure 3 It is a right view of the structure of the utility model;

[0016] Among them, 1. fixing nut, 2. connecting cover, 3. stepped shaft, 4. positioning rod, 41. blocking block, 411. positioning surface, 412. chip groove, 413. collecting groove, 5. main shaft. DETAILED DESCRIPTION

[0017] The present invention is further described in detail below in conjunction with the embodiments:

[0018] Embodiment 1:

[0019] like Figure 1 , 2 3 is a schematic diagram of the structure of a camshaft processing and positioning device for a CNC lathe. First, the protective cover at the tail end of the CNC lathe spindle 5 is removed to expose the spindle 5, and a connecting cover 2 is sleeved on the tail end of the spindle 5. In this embodiment, the specific connection method is that an external thread is provided on the tail end of the spindle 5, the main body of the connecting cover 2 is cylindrical, and an internal thread that matches the external thread of the spindle 5 is provided inside the connecting cover 2. The connecting cover 2 is connected and fixed to the tail end of the spindle 5 through mutual meshing of threads. A through hole is provided in the middle of the top of the connecting cover 2, and a stepped shaft 3 is provided in the through hole. The stepped shaft 3 is composed of three sections of cylindrical bodies with increasing radii in sequence, and is stepped when viewed from the side. The three sections are the front end, the middle end, and the tail end in sequence. The outer diameter of the middle end is matched with the inner diameter of the through hole of the connecting cover 2, the length of the middle end is matched with the depth of the through hole, the middle end of the stepped shaft 3 is completely inserted into the through hole of the connecting cover 2, an external thread is provided on the bottom of the front end of the stepped shaft 3, and the external thread is smooth before, the internal thread of the fixing nut 1 is matched with the external thread of the front end of the stepped shaft, and the stepped shaft 3 is fixed in the connecting cover 2 by tightening the fixing nut 1 to match the middle end, and the front end structure is smooth first and then threaded structure, which can prevent the thread from being damaged and unable to be tightened, causing it to fall off. The fixing nut 1 is an external hexagonal nut, which is convenient for tightening and loosening with tools. The connecting shaft 3 plays an intermediate connecting role, and a positioning rod 4 is connected to the rear end of the connecting shaft 3, and a block 41 is provided at the rear end of the positioning rod 4. In this embodiment, the connection and fixing method is specifically that the positioning rod 4 is provided with an external thread on the end away from the block 41, and the rear end of the stepped shaft 3 is provided with an internal thread that matches the external thread at the end of the positioning rod 4, and the positioning rod 4 is tightened and fixed in the stepped shaft 3 through the mutual engagement of the threads. The block 41 at the tail end of the positioning rod 4 is cylindrical and fits in the main shaft 5 with a clearance of 1-2 mm. The plane at the bottom of the block 41 is a positioning surface, which is used to contact and tighten the left end face of the camshaft to be produced. The entire surface of the block 41 is axially provided with a plurality of collecting grooves 413. In this embodiment, Figure 3 As shown, there are four collecting grooves 413, and a chip removal groove 412 for chip removal is provided in an annular direction on the surface of the block 41, and the chip removal groove 412 is a circumferential annular groove.

[0020] When the new type is in use, it is connected by the tail end of the CNC lathe spindle 5, the cylindrical block of the positioning rod is in a vertical state with the contact end face of the camshaft, pressing the left end face of the camshaft, and the right end of the camshaft is positioned by the tailstock top, limiting the axial movement of the camshaft, playing the role of axial positioning, and the axial 4 grooves on the surface of the cylindrical block of the positioning rod 4 collect chips, and the circumferential ring groove facilitates chip removal. For different models, the distance between the camshaft processing zero point and the chuck can be adjusted by replacing positioning rods of different lengths, reducing the vibration of the workpiece during processing and improving the processing quality.

[0021] The embodiments described above are merely descriptions of preferred implementation modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should fall within the protection scope determined by the claims of the present invention.

Claims

1. A camshaft machining and positioning device for a CNC lathe, characterized in that: The invention comprises a connecting cover (2) which is arranged at the tail end of a spindle (5) after the protective cover of a lathe is removed, a through hole is arranged in the middle of the top of the connecting cover (2), a stepped shaft (3) is arranged in the through hole, a front end, a middle end and a tail end with increasing radii are arranged in a stepped shape on the stepped shaft (3), a fixing nut (1) is arranged on the front end, the outer diameter of the middle end is matched with the inner diameter of the through hole of the connecting cover (2), the length of the middle end is matched with the depth of the through hole, a positioning rod (4) is fixedly arranged in the tail end, a blocking block (41) is arranged at the tail end of the positioning rod (4), the plane at the bottom of the blocking block (41) is a positioning surface (411), a plurality of collecting grooves (413) for collecting chips are arranged axially on the surface of the blocking block (41), a chip removal groove (412) for chip removal is arranged circumferentially on the surface of the blocking block (41), and the chip removal groove (412) is a circumferential annular groove.

2. The camshaft machining and positioning device for a CNC lathe according to claim 1, characterized in that: The tail end of the main shaft (5) is provided with an external thread, and the interior of the connecting cover (2) is provided with an internal thread that matches the external thread of the main shaft (5).

3. The camshaft machining and positioning device for a CNC lathe according to claim 1, characterized in that: An external thread is arranged on one end of the positioning rod (4) away from the blocking block (41), and an internal thread matching the external thread at the end of the positioning rod (4) is arranged inside the tail end of the stepped shaft (3).

4. The camshaft machining and positioning device for a CNC lathe according to claim 1, characterized in that: An external thread adapted to the fixing nut (1) is arranged on the bottom of the front end of the stepped shaft (3), and the front surface of the external thread is smooth.

5. The camshaft machining and positioning device for a CNC lathe according to claim 4, characterized in that: The fixing nut (1) is an external hexagonal nut.

6. The camshaft machining and positioning device for a CNC lathe according to claim 1, characterized in that: The tail block (41) of the positioning rod (4) is cylindrical and fits in the main shaft (5) with a clearance of 1-2 mm with the hole of the main shaft (5).

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