阅读说明：本技术 一种螺杆轴零件的自动倒角装置与工艺方法 (Automatic chamfering device and process method for screw shaft part ) 是由 何建平 骆波阳 魏兆成 刘国龙 齐宏福 郭明龙 于 2020-12-15 设计创作，主要内容包括：一种螺杆轴零件的自动倒角装置与工艺方法,在卡盘主体上的卡槽内滑动连接卡盘爪手,在卡盘爪手上设有定位机构。螺杆轴零件的自动倒角的工艺方法,包括以下步骤：步骤(1)运送螺杆轴至机床卡盘；步骤(2)卡盘爪手预夹紧螺杆轴；步骤(3)机械臂爪手推动螺杆轴至指定位置；步骤(4)计算螺杆轴螺纹的径向位置角；步骤(5)螺纹倒角侧铣加工,设置刀轴垂直螺杆轴中心线；步骤(6)完成螺杆轴另一端的倒角加工。本发明可极大缩短螺杆轴的加工时间,保障加工质量的稳定,降低经济成本,降低劳动者的工作强度。(An automatic chamfering device and a process method for screw shaft parts are characterized in that a chuck claw is connected in a clamping groove in a chuck main body in a sliding mode, and a positioning mechanism is arranged on the chuck claw. The process method for automatically chamfering the screw shaft part comprises the following steps: step (1) conveying a screw shaft to a machine tool chuck; step (2) pre-clamping the screw shaft by a chuck claw; step (3) the mechanical arm claw hand pushes the screw shaft to a designated position; step (4), calculating the radial position angle of the screw shaft thread; step (5), performing side milling on the thread chamfer, and setting a cutter shaft to be vertical to the central line of a screw shaft; and (6) finishing chamfering at the other end of the screw shaft. The invention can greatly shorten the processing time of the screw shaft, ensure the stability of the processing quality, reduce the economic cost and reduce the working intensity of workers.)

1. The utility model provides an automatic chamfer device of screw shaft part, mainly includes chuck main part, chuck claw and positioning mechanism, its characterized in that: a chuck claw is connected in the clamping groove on the chuck body in a sliding way, and a positioning mechanism is arranged on the chuck claw.

2. The automatic chamfering apparatus of a screw shaft part according to claim 1, wherein: the chuck claw is in a ladder shape, is from bottom to top, is provided with threaded holes on a first layer ladder and a second layer ladder, is connected with the chuck main body through screws, and is provided with a positioning mechanism on a third layer ladder.

3. The automatic chamfering apparatus of a screw shaft part according to claim 1, wherein: the positioning mechanism comprises a positioning block, a spring and a limit screw, a counter bore is arranged on a third step of the chuck claw, the radial direction of the counter bore extends to the chuck and extends to a central shaft, the positioning block, the spring and the limit screw are inserted in the counter bore, and the positioning block is axially limited through the limit screw.

4. The automatic chamfering apparatus of a screw shaft part according to claim 3, wherein: the end face of the positioning block is hemispherical or threaded, and can move smoothly in the screw shaft spiral groove.

5. The process method of the automatic chamfering device of the screw shaft part by using the automatic chamfering device of the screw shaft part is characterized in that: step (1) transporting the screw shaft to a machine tool chuck: horizontally moving the screw shaft into the chuck body through the mechanical arm; step (2), pre-clamping a screw shaft by a chuck claw: after moving the screw shaft to the designated position of the chuck body, radially contracting the pre-clamping screw shaft through a positioning mechanism on the chuck claws, marking one of the chuck claws at the designated radial position as a reference chuck claw, and adjusting the clamping force of the chuck claws so that the screw shaft can radially rotate under the driving of a mechanical arm; step (3), the mechanical arm claw hand pushes the screw shaft to a designated position: after a screw shaft is clamped by a chuck claw hand in advance, a positioning block is in a compression state, the end face of the positioning block is arranged in a thread groove of the screw shaft or is in contact with the top of a thread of the screw shaft, a mechanical arm gripper releases the screw shaft and moves to a position coaxial with the screw shaft, the mechanical arm gripper is closed, the screw shaft is pushed by the mechanical arm gripper along the axial direction and moves to an appointed position, so that the positioning block enters the thread groove of the screw, the axial moving distance of the screw shaft is at least one thread pitch, the axial moving appointed position can meet the requirement that the overhanging length is a set value, and the positioning block enters the thread groove and performs rotary motion along the thread groove;

and (4) calculating the radial position angle of the screw shaft thread: after the screw shaft is pushed to a designated position, clamping by a chuck claw to be processed, and obtaining a radial position angle of the thread according to the radial position of the positioning block, the screw shaft overhang length, the thread helix angle and the thread head number;

and (5) performing side milling on the thread chamfer, and setting the central line of a cutter shaft vertical to a screw shaft: planning a cutter path by using CAM software, enabling a cutter shaft to be vertical to a screw shaft, utilizing a side edge of a milling cutter to chamfer, and after finishing the first thread chamfer processing, rotating a thread pitch included angle by a chuck to perform the next thread chamfer;

and (6) finishing chamfering at the other end of the screw shaft: and (5) after chamfering all threads at one end of the screw shaft, transferring the screw shaft to the other chuck claw of the machine tool by the mechanical arm claw, and repeating the steps (2) - (5) to finish chamfering at the other end of the screw shaft.

6. The process of the automatic chamfering device for screw shaft parts using the automatic chamfering device for screw shaft parts according to claim 5, wherein: in the step (3), the area of the end face formed when the mechanical arm hand is folded is larger than that of the end face of the screw shaft, and the end face formed when the mechanical arm hand is folded is flat.

Technical Field

The invention belongs to the technical field of chamfering processing, and particularly relates to an automatic chamfering device and a process method for screw shaft parts.

Background

In the field of modern automobile industry, the rapid development of new energy automobiles can meet the social environmental protection requirements and simultaneously ensure the safety of energy, so that the new energy automobiles are predicted to become the leading force of the future automobile market, and the brand-new electronic brake system has a very wide technical market prospect.

The hollow screw shaft is a core part of a new energy automobile brake system, and the precision requirement on the hollow screw shaft is extremely high. In order to improve the production efficiency, reduce the production cost and ensure the processing quality, the automation degree of the screw shaft processing is very important. The automatic processing of the screw shaft can further accelerate the popularization of the electronic brake system and increase the social and economic efficiency.

Disclosure of Invention

The invention aims to provide an automatic chamfering device and a process method for screw shaft parts, which can greatly shorten the processing time of a screw shaft, ensure the stability of the processing quality, reduce the economic cost and save manpower.

The invention mainly comprises a chuck main body, chuck claws and a positioning mechanism.

The chuck body is provided with a clamping groove, a chuck claw is connected with the clamping groove in a sliding mode, and a positioning mechanism is arranged on the chuck claw.

Preferably, the chuck claw is in a step shape, is provided with threaded holes from bottom to top on the first step and the second step, and is connected with the chuck body through screws. And a positioning mechanism is arranged on the third layer of ladder.

Preferably, the positioning mechanism comprises a positioning block, a spring and a limit screw. And a counter bore is arranged on the third step of the chuck claw, and the radial direction of the counter bore reaches the chuck and is extended to the central shaft. And a positioning block, a spring and a limit screw are inserted in the counter bore, and the positioning block is axially limited by the limit screw. Namely, the limiting screw is rotated and the spring is compressed, and when the end surface of the positioning block is subjected to external pressure, the spring is compressed to move in a radial contraction mode.

Preferably, the end surface of the positioning block is hemispherical or threaded, and the end surface of the positioning block can move smoothly in the screw shaft spiral groove.

The process method for automatically chamfering the screw shaft part comprises the following steps:

step (1) transporting the screw shaft to a machine tool chuck: horizontally moving the screw shaft into the chuck body through the mechanical arm;

step (2), pre-clamping a screw shaft by a chuck claw: after moving the screw shaft to the designated position of the chuck body, radially contracting the pre-clamping screw shaft through a positioning mechanism on the chuck claws, marking one of the chuck claws at the designated radial position as a reference chuck claw, and adjusting the clamping force of the chuck claws so that the screw shaft can radially rotate under the driving of a mechanical arm;

step (3), the mechanical arm claw hand pushes the screw shaft to a designated position: after a chuck claw hand clamps a screw shaft in advance, a positioning block is in a compressed state, the end face of the positioning block is arranged in a thread groove of the screw shaft or is in contact with the top of a thread of the screw shaft, a mechanical arm gripper releases the screw shaft and moves to a position coaxial with the screw shaft, the mechanical arm gripper is closed, the mechanical arm gripper is used for pushing the screw shaft along the axial direction and moves to a specified position, so that the positioning block enters the thread groove of the screw, the axial moving distance of the screw shaft is at least one thread pitch, the specified position of the axial movement can meet the requirement that the overhanging length is a set value, when the positioning block is arranged in the thread groove, the screw shaft performs rotary motion along the thread groove, when the positioning block is arranged at the top of the thread, the screw shaft performs axial motion firstly, and the positioning block enters the thread groove and;

and (4) calculating the radial position angle of the screw shaft thread: after the screw shaft is pushed to a designated position, clamping by a chuck claw to be processed, and obtaining a radial position angle of the thread according to the radial position of the positioning block, the screw shaft overhang length, the thread helix angle and the thread head number;

and (5) performing side milling on the thread chamfer, and setting the central line of a cutter shaft vertical to a screw shaft: planning a cutter path by using CAM software, enabling a cutter shaft to be vertical to a screw shaft, utilizing a side edge of a milling cutter to chamfer, and after finishing the first thread chamfer processing, rotating a thread pitch included angle by a chuck to perform the next thread chamfer;

and (6) finishing chamfering at the other end of the screw shaft: and (5) after chamfering all the threads at one end of the screw shaft, directly transferring the screw shaft into another chuck claw of the machine tool by the mechanical arm, and repeating the steps (2) - (5) to finish chamfering at the other end of the screw shaft.

Preferably, in the step (3), the area of the end surface formed when the mechanical arm hand is closed is larger than that of the end surface of the screw shaft, and the end surface formed when the mechanical arm hand is closed is flat.

Compared with the prior art, the invention has the following advantages:

the processing time of the screw shaft can be greatly shortened, the stability of the processing quality is guaranteed, the economic cost is reduced, and the working intensity of workers is reduced.

Drawings

FIG. 1 is a schematic view of a chuck having a radial positioning mechanism according to the present invention;

FIG. 2 is a schematic diagram of the construction of the datum chuck jaw of the present invention;

FIG. 3 is a schematic view of the positioning block of the reference chuck jaw of the present invention engaged with the screw shaft;

FIG. 4 is a schematic view of the screw shaft clamp of the present invention;

FIG. 5 is a schematic view of the chamfer machining of the screw shaft of the present invention;

in the figure, 1-chuck body, 2-chuck claw, 3-positioning block, 4-spring and 5-limit screw.

Detailed Description

The present invention is further illustrated with reference to examples, but the scope of the present invention is not limited to the following examples.

In the schematic diagrams of the present invention shown in fig. 1 and 2, a chuck jaw 2 is slidably connected to a slot of a chuck body 1, the chuck jaw is stepped from bottom to top, and threaded holes are formed in a first step and a second step and connected to the chuck body through screws. And a positioning mechanism is arranged on the third layer of ladder. And a positioning mechanism is arranged on the chuck claw and comprises a positioning block, a spring and a limit screw. And a counter bore is arranged on the third step of the chuck claw, and the radial direction of the counter bore reaches the chuck and is extended to the central shaft. A positioning block 3, a spring 4 and a limit screw 5 are inserted in the counter bore, and the positioning block is axially limited by the limit screw. Namely, the limiting screw is rotated and the spring is compressed, and when the end surface of the positioning block is subjected to external pressure, the spring is compressed to move in a radial contraction mode. The end face of the positioning block is spherical or threaded, and can move smoothly in the screw shaft spiral groove.

In the schematic diagrams of the present invention shown in fig. 3, 4 and 5, a hollow screw shaft adopted by a certain electronic braking system has a length of 71mm, an outer diameter of 18.5mm, an inner diameter of 10.5mm, a thread thickness of 1.7mm, a thread height of 1.5mm, a thread head number of 4, a thread groove width of 2.5mm, a thread helix angle of 30 degrees, and a screw shaft chamfering processing device of an OKUMA MULTUS B400-W turning and milling composite center.

Step (1) transporting the screw shaft to a machine tool chuck: the BRTIRUS0805A type six-degree-of-freedom industrial robot is combined with a single-degree-of-freedom mechanical arm gripper customized by ReFlex company, a screw shaft is horizontally moved into a chuck body, the outer diameter of the body of an air chuck is 200mm, and the axial depth of the screw shaft entering the chuck is 20 mm. The mechanical arm grippers are three cylinders with the diameter of 8mm and the length of 20mm, and the linear contact of the grippers with the screw shaft is guaranteed.

Step (2), clamping a screw shaft by a chuck jaw in advance: the chuck rotates in the radial direction to enable the reference chuck jaw to be located at the highest position in the plane passing through the central line of the machine tool spindle, the pre-clamping screw shaft is radially contracted through a given mechanism on the chuck jaw, one chuck jaw is located at a specified radial position and marked as the reference chuck jaw, the clamping force of the chuck jaw is adjusted, the pre-clamping force of the pneumatic chuck is set to be about 3N, and the screw shaft can rotate in the radial direction under the driving of a mechanical arm;

step (3), the mechanical arm claw hand pushes the screw shaft to a designated position: utilizing machineThe mechanical arm gripper pushes the screw to axially move 10mm in the chuck, so that the positioning block is ensured to enter the spiral groove; the overhanging length of the screw shaft after the moving is finished is 41mm, the follow-up chamfering processing is ensured not to be interfered, and after the three mechanical arm grippers are closed, the forming area of the three cylindrical grippers is about 200mm²A circular plane of (a); the moving speed is 5mm/s, and the inertial motion of the screw shaft is avoided. The height of the third layer of the reference chuck jaw is 60mm, the width of the third layer of the reference chuck jaw is 30mm, the diameter of the third layer of the reference chuck jaw is 8mm along the radial direction of a counter bore, the distance between the central line and the top surface of the step is 12mm, the length of the end part of the positioning block, which is arranged outside the third step of the chuck jaw hand, is 7.5mm, the end part of the positioning block is hemispherical, the friction resistance with a screw shaft is reduced so as to be beneficial to sliding, and the diameter of the hemisphere at the end part of the positioning block is 2. The positioning block can be extended and retracted smoothly by determining the parameters of the spring 4 and the screwing depth of the limiting screw.

And (4) calculating the radial position angle of the screw shaft thread: after the screw shaft is pushed to a designated position, clamping by a chuck claw to be processed, obtaining a radial position angle of a thread according to the radial position of a positioning block, the suspension elongation of the screw shaft, the spiral angle of the thread and the number of thread heads, wherein the axial distance from the positioning block to the chamfer angle of the screw shaft is 49 mm;

and (5) performing side milling on the thread chamfer, and setting the central line of a cutter shaft vertical to a screw shaft: introducing radial position angles of all threads into CAM software, setting a cutter shaft to be vertical to the central line of a screw shaft, programming a cutter track of a side milling chamfer in a coordinate system, wherein a milling cutter adopts a right-handed hard alloy flat-end milling cutter with 4 blades, the diameter of the right-handed hard alloy flat-end milling cutter is 6mm, the helical angle of the right-handed hard alloy flat-end milling cutter is 30 degrees, the rotating speed is 3000r/min during processing, the feed rate is 200mm/min, and after the first thread chamfer is processed, a chuck rotates one thread pitch diameter included angle to perform the;

and (6) finishing chamfering at the other end of the screw shaft: and (5) after chamfering all the threads at one end of the screw shaft, directly transferring the screw shaft into another chuck claw of the machine tool by the mechanical arm, and repeating the steps (2) - (5) to finish chamfering at the other end of the screw shaft.