Efficient turning device for automobile transmission shaft

Abstract

According to the efficient turning device for the automobile transmission shaft, damping assemblies close to each other are arranged on the two sides of a tool base, so that the tool base drives the damping assemblies to move synchronously in the moving process, effective supporting points of the transmission shaft are further increased in cooperation with traditional fixing points at the two ends of the transmission shaft, and a small supporting distance is formed for the transmission shaft; by means of the small supporting distance, most turning force can be limited within the small range when the cutting knife turns the transmission shaft, generated forced vibration is buffered, the amplitude is reduced, the turning force is stabilized, and therefore the surface roughness of the transmission shaft is reduced, the service life of the cutting knife is prolonged, and the supporting distance is small. When the transmission shaft moves, the transmission shaft continuously changes along with the movement of the tool base, so that internal stress generated by cutting of the cutting tool is accumulated and can be more uniformly distributed at all parts of the transmission shaft along with the movement of the damping assembly, and dynamic compensation is carried out.

Description

Technical Field

[0001] The present application relates to the technical field of turning processing, and in particular to a high-efficiency turning device for automobile transmission shafts. Background Art

[0002] During the production and processing of automobile drive shafts, the blanks need to be turned. Since the drive shaft is slender as a whole, in order to reduce the problems of runout and deformation of the slender drive shaft caused by factors such as tool force, workpiece gravity and machine tool vibration, one end of the drive shaft needs to be fixed by a claw plate and the other end needs to be fixed by center extrusion to improve the stability during turning. In addition, by adding a coolant injection pipe to the tool holder, coolant is transported to the turning part to reduce thermal damage to the tool and drive shaft during processing.

[0003] Although the above-mentioned processing method has both ends fixed, the length of the automobile drive shaft is generally between 600mm and 1800mm. This length only relies on the method of fixing the two ends, which cannot effectively solve the problems of runout, vibration and deformation caused by turning. Especially when the position where the turning tool acts on the drive shaft is far away from the fixed position at both ends, the runout and deformation caused by the external force are more obvious. In addition, during turning, the drive shaft will generate more internal stress. The method of fixing the two ends will cause the stress to be concentrated at the mid-span position, making the mid-span position more prone to fatigue damage. When the processed drive shaft is removed, this distributed internal stress is more likely to cause deformation of the drive shaft. Summary of the Invention

[0004] This application proposes an efficient turning device for automobile drive shafts, which has the advantages of multi-point support of the drive shaft to improve stability, narrow support intervals to improve stability, continuous movement of support points to make internal stress more uniform, coolant combined with springs for buffering and shock absorption, and coolant thrown out over a large range for processing cooling and impurity cleaning. It is used to solve the problems of drive shaft vibration and internal stress concentration caused by the two ends being fixed during the existing drive shaft cutting process.

[0005] To achieve the above-mentioned purpose, the present application adopts the following technical solutions: an efficient turning device for an automobile transmission shaft, comprising a tool seat and a transmission shaft to be processed; symmetrical extension plates are respectively provided at the bottoms of both sides of the tool seat, and two symmetrical card slots are provided at the tops of the extension plates; two sets of symmetrical shock-absorbing components are installed on both sides of the tool seat, and the shock-absorbing components include an outer ring, a mounting frame and a positioning wheel; a fixing plate is provided on the side of the outer ring close to the extension plate to connect with the extension plate, and two symmetrical card blocks are provided at the bottom end of the fixing plate to buckle in the card slots; the mounting frame includes a sliding A movable rod, a fork frame is provided at one end of the sliding rod, and two opposite center shafts are respectively provided at two ends of the fork frame away from the sliding rod, and a limit ring is provided at one end of the center shaft away from the fork frame; a damping cavity is provided in the outer ring, and the end of the sliding rod away from the fork frame is inserted into the damping cavity, and a resistance plate is provided on one end of the sliding rod located in the damping cavity, and a spring is provided between the resistance plate and the inner side wall of the damping cavity close to the fork frame; a hollow cavity is provided in the positioning wheel, and the centers of both sides of the positioning wheel pass through, and the two center shafts are respectively sleeved on the centers of both sides of the positioning wheel.

[0006] Preferably, a tool mounting hole is provided at the center of one end of the tool seat facing the transmission shaft for mounting a cutting tool.

[0007] Preferably, the outer ring is annularly sleeved on the outer side of the transmission shaft, and the axis of the outer ring coincides with the axis of the transmission shaft.

[0008] Preferably, two symmetrical limiting strips are provided on the outer side of the sliding rod.

[0009] Preferably, symmetrical mounting grooves are respectively provided on both sides of the positioning wheel, and an annular mounting ring plate is provided on the outer side of the central axis and is buckled and installed in the mounting groove.

[0010] Preferably, a connecting nozzle is provided on the top of the outer ring, and a coolant tank is provided above the turning device and connected to the connecting nozzle through a hose.

[0011] Preferably, a liquid flow channel is opened in the mounting frame, and the damping cavity and the hollow cavity are connected through the liquid flow channel.

[0012] Preferably, the positioning wheel is tilted, and the angle between it and the axis of the transmission shaft is between thirty and sixty degrees. A drainage port is provided on the circumferential wheel surface of the positioning wheel, and the opening of the drainage port is tilted toward the surface of the transmission shaft.

[0013] The present application provides an efficient turning device for automobile drive shafts, which arranges close shock-absorbing components on both sides of the tool seat, so that the tool seat drives the shock-absorbing components to move synchronously during movement, and cooperates with the traditional fixed points at both ends of the drive shaft to further increase the effective support points of the drive shaft, thereby improving the overall stiffness, stability, and deformation resistance of the drive shaft during processing, and making the stress distribution of the drive shaft more uniform during turning.

[0014] At the same time, the shock-absorbing components on both sides form a smaller support spacing for the drive shaft, so that when the cutting tool turns the drive shaft, most of the turning force can be limited to this smaller range, and the forced vibration generated is buffered, the amplitude is reduced, and the turning force is stabilized, thereby reducing the surface roughness of the drive shaft and extending the service life of the tool. The smaller support spacing is in a constantly changing process following the movement of the tool holder, so the internal stress accumulation generated by the cutting of the cutting tool can be more evenly distributed on all parts of the drive shaft following the movement of the shock-absorbing component, performing dynamic compensation and reducing the bending deformation of the drive shaft.

[0015] At the same time, by tilting the positioning wheel, the transmission shaft can rub the positioning wheel during rotation, driving the positioning wheel to rotate. Under the action of centrifugal force and gravity, the positioning wheel can throw out the coolant in the hollow cavity through the drain port, causing the coolant to be thrown toward the cutting tool and the transmission shaft, so that the processed part of the transmission shaft can be covered with coolant for cooling treatment after processing, and the cutting tool and the part to be cut of the transmission shaft can also be covered with coolant for cooling treatment during processing. The thrown coolant has power and can flush the processed part, thereby removing the waste chips remaining in the processed part and improving the accuracy of subsequent turning.

[0016] At the same time, the coolant in the damping chamber will act as a "damping fluid". When the drive shaft vibrates, it will be transmitted to the positioning wheel and then to the mounting bracket. At this time, the mounting bracket will drive the resistance plate to move away from the drive shaft. The coolant will hinder the movement of the resistance plate and cooperate with the elastic force of the spring to buffer and absorb the vibration, further absorb the vibration and improve stability. At the same time, in the process of moving the positioning wheel, when it reaches the part where the diameter of the drive shaft gradually becomes smaller, the spring will pull the mounting bracket to drive the positioning wheel to move in the direction of the drive shaft. At this time, the coolant will hinder the movement of the resistance plate and slow down the moving speed of the mounting bracket to avoid the rapid displacement of the positioning wheel and impact on the drive shaft, resulting in additional vibration of the drive shaft. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0018] The present disclosure can be more clearly understood from the following detailed description with reference to the accompanying drawings, in which:

[0019] Figure 1 This is a schematic diagram of the three-dimensional structure distribution of the present invention;

[0020] Figure 2 This is a schematic diagram of the tool holder structure of the present invention;

[0021] Figure 3 This is a schematic diagram of the distribution of shock absorbing components of the present invention;

[0022] Figure 4 This is a schematic structural diagram of the shock absorbing assembly of the present invention;

[0023] Figure 5 This is a schematic diagram of the mounting frame structure of the present invention;

[0024] Figure 6 This is a schematic structural diagram of the positioning wheel of the present invention.

[0025] Among them: 1. Tool seat; 2. Tool mounting hole; 3. Extension plate; 31. Card slot; 4. Drive shaft; 5. Outer ring; 51. Damping chamber; 6. Connecting nozzle; 7. Fixed plate; 71. Card block; 8. Resistance plate; 9. Sliding rod; 91. Fork frame; 92. Center axis; 93. Limiting ring; 10. Limiting strip; 11. Liquid flow channel; 12. Spring; 13. Mounting ring plate; 14. Positioning wheel; 15. Hollow cavity; 16. Drain port; 17. Mounting slot. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0027] Example 1

[0028] See also Figures 1 to 2 A high-efficiency turning device for an automobile transmission shaft includes a tool holder 1 and a transmission shaft 4 to be processed. The tool holder 1 is provided with a tool mounting hole 2 at the center of one end facing the transmission shaft 4 for mounting a cutting tool. The tool holder 1 is located on both sides of the transmission shaft 4 in the axial direction and is fixedly connected to symmetrical extension plates 3 at the bottom thereof. Two symmetrical slots 31 are provided at the top of the extension plate 3 in the length direction.

[0029] See Figure 1 , Figure 3Two sets of symmetrical shock-absorbing components are installed on both sides of the tool seat 1. The shock-absorbing components include an outer ring 5, a mounting frame and a positioning wheel 14. Through the shock-absorbing components on both sides, a smaller support spacing is formed for the transmission shaft 4, so that when the cutting tool turns the transmission shaft 4, most of the turning force can be limited to this smaller range, and the forced vibration generated is buffered, the amplitude is reduced, and the turning force is stabilized. The smaller support spacing is in a constantly changing process following the movement of the tool seat 1, so that the internal stress generated by the cutting tool is accumulated and can be more evenly distributed on all parts of the transmission shaft 4 following the movement of the shock-absorbing component, thereby performing dynamic compensation and reducing the bending deformation of the transmission shaft 4.

[0030] See Figures 1 to 3 The outer ring 5 is annularly sleeved on the outside of the transmission shaft 4, and the axis of the outer ring 5 coincides with the axis of the transmission shaft 4, so that the shock absorber assembly can run stably on the outside of the transmission shaft 4, and will not have additional influence on the transmission shaft 4 due to the eccentricity problem. A fixing plate 7 is welded on the side of the outer ring 5 close to the extension plate 3. The bottom end of the fixing plate 7 is fixedly connected to two symmetrical clamping blocks 71, which are snapped into the clamping groove 31. The fixing plate 7 is fixedly connected to the extension plate 3 by bolts, so that the outer ring 5 can be stably connected to the tool seat 1 through the fixing plate 7 and the clamping block 71, thereby performing synchronous reciprocating linear motion with the tool seat 1.

[0031] See Figures 1 to 5 The mounting frame includes a sliding rod 9, one end of which is fixedly connected to a fork frame 91. The fork frame 91 is U-shaped, and the two ends of the fork frame 91 away from the sliding rod 9 are fixedly connected to two opposite central shafts 92. One end of the central shaft 92 away from the fork frame 91 is fixedly connected to a limiting ring 93, so that the positioning wheel 14 can rotate on the central shaft 92 with the axis as the base point, and the limiting ring 93 will limit the position of the positioning wheel 14.

[0032] See Figures 3 to 5, an annular damping chamber 51 is opened in the outer ring 5, and the end of the sliding rod 9 away from the fork frame 91 is movably inserted into the damping chamber 51, and two symmetrical limit strips 10 are welded on the outside of the sliding rod 9. The existence of the limit strip 10 will limit the movement of the sliding rod 9, so that the sliding rod 9 can only perform linear reciprocating motion in the damping chamber 51, and a resistance plate 8 is welded on one end of the sliding rod 9 located in the damping chamber 51. A spring 12 is fixedly connected to the end of the resistance plate 8 facing the fork frame 91, and the other end of the spring 12 is fixedly connected to the inner side wall of the damping chamber 51 close to the fork frame 91, so that when the positioning wheel 14 just contacts the transmission shaft 4, it will be squeezed by the transmission shaft 4, driving the entire mounting frame to move away from the transmission shaft 4. The spring 12 will stretch when the tool holder 1 is cutting, and the diameter of the transmission shaft 4 will change. When the positioning wheel 14 follows the tool holder 1 to move to a position where the diameter value is reduced, the stretched spring 12 will pull the mounting frame, driving the positioning wheel 14 to move in the direction of the transmission shaft 4, so that the positioning wheel 14 is close to the transmission shaft 4. When the positioning wheel 14 follows the tool holder 1 to move to a position where the diameter value increases, it will be squeezed by the transmission shaft 4, driving the entire mounting frame to move away from the transmission shaft 4. At this time, the spring 12 will stretch again. When the transmission shaft 4 vibrates due to external force, the vibration will be transmitted to the positioning wheel 14, and the vibration will be absorbed and buffered by the spring 12 to improve stability.

[0033] See Figure 1 , Figures 3 and 4 , Figure 6 , a positioning wheel 14, a hollow cavity 15 is opened in the positioning wheel 14, and symmetrical mounting grooves 17 are opened on both sides of the positioning wheel 14, and the centers of both sides of the positioning wheel 14 pass through.

[0034] See Figures 4 to 6 The outer side of the center shaft 92 is movably sleeved with an annular mounting ring plate 13, which is buckled into the mounting groove 17 and fixedly connected to the positioning wheel 14 by bolts. The circumferential surface of the positioning wheel 14 is made of wear-resistant rubber, so that the positioning wheel 14 can be easily installed and removed from the center shaft 92, and at this time the positioning wheel 14 is movably sleeved on the center shaft 92, and the limit ring 93 will also limit the position of the positioning wheel 14, so that the positioning wheel 14 can only rotate on its own. The rotation of the transmission shaft 4 will rub the positioning wheel 14, causing the positioning wheel 14 to rotate on its own. The rotating positioning wheel 14 will roll and rub the center shaft 92, avoiding the positioning wheel 14 from contacting the rotating transmission shaft 4 at a single point. With the flexible wear-resistant rubber, the contact point between the transmission shaft 4 and the positioning wheel 14 will not have the problem of friction and wear.

[0035] Example 2

[0036] See also Figure 1 , Figure 3On the basis of the first embodiment, the top of the outer ring 5 is fixedly connected with a connecting nozzle 6, and a coolant tank is arranged above the turning device. The coolant tank is connected to the connecting nozzle 6 through a hose, and a valve is installed on the hose. Before turning starts, the valve is opened, and the coolant will continuously enter the damping chamber 51 through the hose and the connecting nozzle 6 under its own weight, so that the damping chamber 51 is filled. The coolant in the damping chamber 51 will act as a "damping liquid". When the transmission shaft 4 vibrates, it will be transmitted to the positioning wheel 14 and then to the mounting bracket. At this time, the mounting bracket will drive the resistance plate 8 moves in the direction away from the transmission shaft 4, the coolant will hinder the movement of the resistance plate 8, and cooperate with the elastic force of the spring 12 to buffer and absorb the vibration, thereby improving stability. At the same time, in the process of moving the positioning wheel 14, when it reaches the part where the diameter of the transmission shaft 4 gradually becomes smaller, the stretched spring 12 will pull the mounting bracket to drive the positioning wheel 14 to move in the direction of the transmission shaft 4. At this time, the coolant will hinder the movement of the resistance plate 8 and slow down the moving speed of the mounting bracket, thereby avoiding the problem of rapid displacement of the positioning wheel 14 and impact on the transmission shaft 4, which will cause additional vibration of the transmission shaft 4.

[0037] See Figure 3 , Figures 5 and 6 A liquid flow channel 11 is opened in the mounting frame, and the damping chamber 51 and the hollow chamber 15 are connected through the liquid flow channel 11. The coolant in the damping chamber 51 will enter the hollow chamber 15 through the liquid flow channel 11, and then be continuously discharged through the drain port 16 to cool the part where the positioning wheel 14 passes.

[0038] See Figure 1 , Figure 3 , Figure 6The positioning wheel 14 is tilted and arranged at an angle with the axis of the transmission shaft 4 between thirty and sixty degrees. A drain port 16 is provided on the circumferential wheel surface of the positioning wheel 14. The opening of the drain port 16 is tilted toward the surface of the transmission shaft 4, so that the transmission shaft 4 can rub the positioning wheel 14 during rotation, driving the positioning wheel 14 to rotate. Under the action of centrifugal force and gravity, the positioning wheel 14 can throw out the coolant in the hollow cavity 15 through the drain port 16, causing the coolant to be thrown toward the cutting tool and the transmission shaft 4 over a large area, so that the processed part of the transmission shaft 4 can be covered with the coolant for cooling after processing, and the cutting tool and the part to be cut of the transmission shaft 4 can also be covered with the coolant for cooling during processing, and the coolant can be thrown out. The coolant that comes out has power and can flush the processed parts, thereby removing the waste chips remaining in the processed parts and improving the accuracy of subsequent turning. It should be noted that when the positioning wheel 14 absorbs vibration, the movement of the resistance plate 8 will squeeze and push the surrounding coolant, and accelerate the discharge from the drain port 16, causing the cutting tool and the surface of the transmission shaft 4 to obtain more coolant per unit time. At this time, the extra heat accumulation caused by vibration will be taken away more quickly, especially the contact part between the cutting tool and the transmission shaft 4, and the discharge of coolant will form a relatively low-pressure environment in the damping chamber 51, so that the coolant above can be quickly and continuously replenished into the damping chamber 51, maintaining an effective buffer environment for sufficient coolant supply.

Claims

1. An efficient turning device for automobile transmission shaft, characterized in that: It comprises a tool holder (1) and a transmission shaft (4) to be processed; Symmetrical extension plates (3) are respectively provided at the bottoms of both sides of the tool holder (1); Two sets of symmetrical shock-absorbing components are installed on both sides of the tool holder (1); A shock absorbing assembly comprising an outer ring (5), a mounting frame and a positioning wheel (14); A fixing plate (7) is provided on one side of the outer ring (5) close to the extension plate (3) and connected to the extension plate (3); The mounting frame comprises a sliding rod (9), one end of the sliding rod (9) is provided with a fork frame (91), two opposite central shafts (92) are respectively provided at two ends of the fork frame (91) away from the sliding rod (9), and a limiting ring (93) is provided at one end of the central shaft (92) away from the fork frame (91); A damping chamber (51) is provided in the outer ring (5), and one end of the sliding rod (9) away from the fork frame (91) is inserted into the damping chamber (51). A resistance plate (8) is provided on one end of the sliding rod (9) located in the damping chamber (51), and a spring (12) is provided between the resistance plate (8) and the inner side wall of the damping chamber (51) close to the fork frame (91); A hollow cavity (15) is provided in the positioning wheel (14), and the centers of both sides of the positioning wheel (14) pass through the two center shafts (92), which are respectively sleeved on the centers of both sides of the positioning wheel (14).

2. The high-efficiency turning device for automobile transmission shaft according to claim 1, characterized in that: The tool seat (1) is provided with a tool mounting hole (2) at the center of one end facing the transmission shaft (4) for mounting a cutting tool. The top end of the extension plate (3) is provided with two symmetrical card slots (31). The bottom end of the fixing plate (7) is provided with two symmetrical card blocks (71) that are buckled into the card slots (31).

3. The high-efficiency turning device for automobile transmission shaft according to claim 1, characterized in that: The outer ring (5) is annularly sleeved on the outside of the transmission shaft (4), and the axis of the outer ring (5) coincides with the axis of the transmission shaft (4).

4. The high-efficiency turning device for automobile transmission shaft according to claim 1, characterized in that: Two symmetrical limiting strips (10) are provided on the outer side of the sliding rod (9).

5. The high-efficiency turning device for automobile transmission shaft according to claim 1, characterized in that: Symmetrical mounting grooves (17) are respectively provided on both sides of the positioning wheel (14), and an annular mounting ring plate (13) is provided on the outer side of the central shaft (92) and is buckled and installed in the mounting groove (17).

6. The high-efficiency turning device for automobile transmission shaft according to claim 1, characterized in that: A connecting nozzle (6) is provided on the top of the outer ring (5), and a coolant tank is provided above the turning device and is connected to the connecting nozzle (6) through a hose.

7. The high-efficiency turning device for automobile transmission shaft according to claim 6, characterized in that: A liquid flow channel (11) is provided in the mounting frame, and the damping chamber (51) and the hollow chamber (15) are connected via the liquid flow channel (11).

8. The high-efficiency turning device for automobile transmission shaft according to claim 7, characterized in that: The positioning wheel (14) is tilted and the angle between it and the axis of the transmission shaft (4) is between 30 and 60 degrees. A drainage port (16) is provided on the circumferential wheel surface of the positioning wheel (14). The opening of the drainage port (16) is tilted toward the surface of the transmission shaft (4).

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