Novel gear milling clamp for steering engine nut and gear milling process thereof

Abstract

The invention discloses a novel steering gear nut gear milling clamp and a gear milling process thereof, and belongs to the technical field of steering gear nut clamping devices, the novel steering gear nut gear milling clamp is characterized in that the novel steering gear nut gear milling clamp comprises a bottom plate, a base, two fixed jaws and a movable jaw, the base is fixedly installed on the bottom plate, the two fixed jaws are fixedly installed on the base, and an oil cylinder seat is in sliding fit with the base; two movable jaws are installed on the inner side wall of the oil cylinder base, the fixed jaw corresponds to the movable jaws, and a power mechanism used for driving the oil cylinder base and the base to slide is installed between the oil cylinder base and the base. An axial positioning mechanism used for limiting the axial direction of the workpiece to be machined is arranged on the base in the axis direction of the workpiece to be machined. Compared with the prior art, the clamping device has the characteristic of improving the clamping precision.

Description

Technical Field

[0001] The invention relates to the technical field of steering machine nut clamping devices, in particular to a novel steering machine nut gear milling fixture and a gear milling process thereof. Background Art

[0002] The commercial vehicle steering nut is an important component in the commercial vehicle steering system. It is not only a bridge connecting the steering rod and the steering gear, but also a direct medium for the driver to control the direction of the vehicle. By simply turning the steering wheel, the vehicle can be accurately steered. Given that commercial vehicles frequently travel through various complex and changeable road conditions in daily operations and often need to carry heavier cargo, the pressure and challenges on the steering nut also increase accordingly. It must be able to withstand huge forces and torques to maintain the overall stability and high reliability of the steering system, which is of great significance to ensuring driving safety.

[0003] In order to ensure that the steering nut can effectively perform its functions, the requirements for its tooth profile accuracy and surface finish are extremely strict. Tooth profile accuracy is directly related to the meshing efficiency and stability of the steering nut and the supporting parts, which in turn affects the response speed and accuracy of the entire steering system; while surface finish affects the friction coefficient and wear resistance, which is crucial to extending service life and reducing failure rate.

[0004] However, in the actual production process, especially in the key process of gear milling, a series of technical problems often become bottlenecks that restrict the improvement of tooth shape accuracy and surface finish. Among them, the insufficient rigidity of the fixture structure will cause vibration during the processing, which directly affects the processing accuracy; the deviation of positioning accuracy may cause the processed tooth shape to deviate from the design standard, causing assembly difficulties or performance degradation. Therefore, how to design a clamping mechanism that can effectively fix the workpiece and ensure high-precision positioning has become an urgent problem to be solved. Summary of the invention

[0005] The purpose of the present invention is to provide a new steering gear nut milling fixture and its milling process to improve the clamping accuracy in view of the above deficiencies in the prior art.

[0006] A novel steering machine nut milling gear clamp provided by the present invention is characterized in that it includes a base plate, a base, a fixed jaw and a movable jaw, the base is fixedly installed on the base, two fixed jaws are fixedly installed on the base, a cylinder seat is slidably matched on the base, two movable jaws are installed on the inner side wall of the cylinder seat, the fixed jaw corresponds to the movable jaw, and a power mechanism for driving the sliding thereof is installed between the cylinder seat and the base; an axial positioning mechanism for axially limiting the workpiece to be processed is arranged on the base along the axial direction of the workpiece to be processed.

[0007] Furthermore, the lower side and the side surface of the fixed jaw form an arc structure, the size of the arc matches the diameter of the nut product, which is convenient for precise radial positioning of the product, and a waist-shaped groove for accommodating iron filings is provided between the lower arc and the side arc of the fixed jaw.

[0008] Furthermore, the power mechanism includes a piston rod and a piston body. The piston rod is fixedly mounted on the base. One end of the piston rod is fixed to the base through a fixed plate. The other end of the piston rod is provided with a piston body. The piston body cooperates with the piston cavity inside the cylinder seat. The piston cavity is sealed by the cavity end cover. Two oil holes are provided on the outer wall of the cylinder seat. The two oil holes are connected with the piston cavity. The two oil holes are respectively located at the two ends of the piston body.

[0009] Furthermore, two guide flat keys are fixedly installed on the base, and the cylinder seat is placed between the two guide flat keys, and the linearity of its movement is ensured by the two guide flat keys. Slideways are provided on the inner walls of the two guide flat keys, and sliders are installed on both sides of the cylinder seat. The sliders are placed in the slideways of the guide flat keys, and the two are slidably matched.

[0010] Furthermore, the axial positioning mechanism includes a fixed seat, a cylinder, and an axial positioning pin. The fixed seat is fixedly installed on one side of the base, the cylinder is fixedly installed on the tail of the fixed seat, the axial positioning pin is fixedly installed on the end of the cylinder's push rod, and the axial positioning pin cooperates with the pin hole of the workpiece to be processed; an axial positioning block is fixed on the base and at a position opposite to the axial positioning pin.

[0011] Furthermore, a guide block is installed on the fixing seat, a guide through hole is provided on the guide block, and the axial positioning pin passes through the guide through hole of the guide block.

[0012] Furthermore, a cavity with an open end is provided on the inner side of the oil cylinder seat, a hydraulic support cylinder is fixedly installed in the cavity, and an inner rod of the hydraulic support cylinder is fixedly connected to a radial positioning pin.

[0013] A milling process based on a new type of steering gear nut milling fixture, characterized in that it includes the following steps: ① After cleaning the cutting fluid and iron chips from the fixture, place the workpiece in the center of the fixed jaws and offset it a certain distance toward the cylinder; ② Start the cylinder and push the axial positioning pin through the cylinder action, so that the axial positioning pin is pushed into the pin hole of the workpiece, driving the workpiece to move to fit with the axial positioning block; ③ After the axial positioning of the workpiece is completed, the cylinder sends a signal, and oil enters the left side of the piston chamber of the cylinder seat, causing the cylinder seat to move to the left as a whole, so that the movable jaws cooperate with the fixed jaws to clamp the workpiece; ④ The action of the cylinder seat is delayed for a period of time, and the hydraulic support cylinder moves to contact the workpiece. After the contact, the gear milling machine starts to move to perform gear milling; ⑤During the processing, most of the iron chips fall into the waist-shaped groove on the lower side of the fixed jaws for collection, which is convenient for cleaning; ⑥ After the workpiece is processed, the movable jaw retracts and the cylinder returns to its original position. After the workpiece is taken out from the fixed jaw, the iron filings in the waist groove of the fixed jaw are cleaned.

[0014] Compared with the prior art, the present invention has the following outstanding beneficial effects: 1. The patent of this invention can clamp the workpiece by the six arcs on the fixed jaw and the movable jaw. The contact area between the six arcs and the workpiece is greater than 50%, and the clamping is reliable without damaging the workpiece. 2. The two arc designs on the lower and side surfaces of the fixed jaws of the present invention have better rigidity and higher positioning accuracy than the upper and lower arc structures; 3. The hydraulic support cylinder of the present invention can drive the radial positioning pin to press against one side of the workpiece, thereby ensuring that the workpiece does not rotate and thus avoiding damage to the milling cutter. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 is a top view of the present invention; Figure 3 yes Figure 2 Cross-sectional view of the AA section; Among them, 1. bottom plate; 2. base; 3. fixed jaw; 4. movable jaw; 5. cylinder seat; 6. fixed seat; 7. cylinder; 8. axial locating pin; 9. guide flat key; 10. piston rod; 11. piston body; 12. hydraulic support cylinder; 13. radial locating pin; 14. axial locating block. DETAILED DESCRIPTION

[0016] The present invention is further described below in conjunction with the accompanying drawings and specific implementation methods.

[0017] like Figure 1 and 2 As shown, the present invention comprises a bottom plate 1, a base 2, a fixed jaw 3 and a movable jaw 4.

[0018] A base 2 is fixedly installed on the bottom plate 1, two fixed jaws 3 are fixedly installed on the base 2, a cylinder seat 5 is slidably fitted on the base 2, two movable jaws 4 are installed on the inner side wall of the cylinder seat 5, the fixed jaws 3 correspond to the movable jaws 4, and a power mechanism for driving them to slide is installed between the cylinder seat 5 and the base 2; an axial positioning mechanism for axially limiting the workpiece to be processed is arranged on the base 2 along the axial direction of the workpiece to be processed.

[0019] The lower side and the side surface of the fixed jaw 3 form an arc structure, the size of the arc matches the diameter of the nut product, which is convenient for precise radial positioning of the product, and a waist-shaped groove for accommodating iron filings is provided between the lower arc and the side arc of the fixed jaw 3, which is convenient for storing iron filings.

[0020] like Figure 3 As shown, the power mechanism includes a piston rod 10 and a piston body 11. The piston rod 10 is fixedly mounted on the base 2. One end of the piston rod 10 is fixed to the base 2 through a fixed plate. The other end of the piston rod 10 is provided with a piston body 11. The piston body 11 cooperates with the piston cavity inside the cylinder seat 5. The piston cavity is sealed by a cavity end cover. Two oil holes are provided on the outer wall of the cylinder seat 5. The two oil holes are connected with the piston cavity. The two oil holes are respectively located at the two ends of the piston body 11.

[0021] Two guide flat keys 9 are fixedly mounted on the base 2, and the oil cylinder seat 5 is placed between the two guide flat keys 9, and the linearity of its movement is ensured by the two guide flat keys 9. Slideways are arranged on the inner side walls of the two guide flat keys 9, and sliders are installed on both sides of the oil cylinder seat 5. The sliders are placed in the slideways of the guide flat keys 9, and the two slide in cooperation. And the oil cylinder seat 5 is acted on to ensure that it will not tilt up and down when subjected to force.

[0022] The axial positioning mechanism includes a fixed seat 6, a cylinder 7, and an axial positioning pin 8. The fixed seat 6 is fixedly installed on one side of the base 2, the cylinder 7 is fixedly installed on the tail of the fixed seat 6, and the axial positioning pin 8 is fixedly installed on the end of the push rod of the cylinder 7. The axial positioning pin 8 cooperates with the pin hole of the workpiece to be processed; an axial positioning block 14 is fixed on the base 2 and at a position opposite to the axial positioning pin 8.

[0023] A guide block is installed on the fixing seat 6 , and a guide through hole is provided on the guide block. The axial positioning pin 8 passes through the guide through hole of the guide block.

[0024] A cavity with an open end is provided on the inner side of the oil cylinder seat 5 , and a hydraulic support cylinder 12 is fixedly installed in the cavity. The inner rod of the hydraulic support cylinder 12 is fixedly connected to the radial positioning pin 13 .

[0025] A milling process based on a new steering gear nut milling fixture includes the following steps: Step 1: After cleaning the cutting fluid and iron chips from the fixture, place the workpiece at the center of the fixed jaw 3 and offset it a certain distance toward the cylinder 7; Step 2, start the cylinder 7, and push the axial positioning pin 8 through the action of the cylinder 7, so that the axial positioning pin 8 is pushed into the pin hole of the workpiece, and the workpiece is driven to move to fit with the axial positioning block; Step 3: After the axial positioning of the workpiece is completed, the cylinder 7 sends a signal, and oil enters the left side of the piston chamber of the cylinder seat 5, so that the cylinder seat 5 moves to the left as a whole, so that the movable jaw 4 cooperates with the fixed jaw 3 to clamp the workpiece; Step 4, the cylinder seat 5 moves for a period of time, and the hydraulic support cylinder 12 moves to contact the workpiece. After the contact, the gear milling machine starts to move to perform gear milling; Step 5: During the processing, most of the iron chips fall into the waist-shaped groove on the lower side of the fixed jaw 3 for collection, which is convenient for cleaning the iron chips; Step 6: After the workpiece is processed, the movable jaw 4 is retracted, and the cylinder 7 is restored to its original position. After the workpiece is taken out from the fixed jaw 3, the iron filings in the waist groove of the fixed jaw 3 are cleaned.

[0026] It should be noted that the specific embodiments of the present invention have been described in detail. For those skilled in the art, various obvious changes to the present invention without departing from the spirit and scope of the present invention are within the protection scope of the present invention.

Claims

1. A new type of steering gear nut milling fixture, characterized by: The invention comprises a bottom plate (1), a base (2), a fixed jaw (3) and a movable jaw (4), wherein the base (2) is fixedly mounted on the bottom plate (1), two fixed jaws (3) are fixedly mounted on the base (2), a cylinder seat (5) is slidably mounted on the base (2), two movable jaws (4) are mounted on the inner side wall of the cylinder seat (5), the fixed jaw (3) corresponds to the movable jaw (4), a power mechanism for driving the sliding of the fixed jaw (3) and the movable jaw (4) is mounted between the cylinder seat (5) and the base (2); an axial positioning mechanism for limiting the axial position of a workpiece to be processed is arranged on the base (2) along the axial direction of the workpiece to be processed.

2. A new type of steering gear nut milling fixture according to claim 1, characterized in that: The lower side and the side surface of the fixed jaw (3) form an arc structure, the size of the arc matches the diameter of the nut product, facilitating precise radial positioning of the product, and a waist-shaped groove for accommodating iron filings is provided between the lower arc and the side arc of the fixed jaw (3).

3. The novel steering gear nut milling fixture according to claim 1 is characterized in that: The power mechanism comprises a piston rod (10) and a piston body (11). The piston rod (10) is fixedly mounted on the base (2). One end of the piston rod (10) is fixed to the base (2) via a fixing plate. The other end of the piston rod (10) is provided with a piston body (11). The piston body (11) cooperates with a piston cavity inside the oil cylinder seat (5). The piston cavity is sealed by a cavity end cover. Two oil holes are provided on the outer wall of the oil cylinder seat (5). The two oil holes are connected to the piston cavity. The two oil holes are respectively located at the two ends of the piston body (11).

4. The novel steering gear nut milling fixture according to claim 1 is characterized in that: Two guide keys (9) are fixedly mounted on the base (2), the cylinder seat (5) is placed between the two guide keys (9), and the linearity of its movement is ensured by the two guide keys (9). Slideways are provided on the inner side walls of the two guide keys (9), and sliders are installed on both sides of the cylinder seat (5). The sliders are placed in the slideways of the guide keys (9), and the two slide in cooperation with each other.

5. The novel steering gear nut milling fixture according to claim 1 is characterized in that: The axial positioning mechanism comprises a fixed seat (6), a cylinder (7), and an axial positioning pin (8); the fixed seat (6) is fixedly mounted on one side of the base (2); the cylinder (7) is fixedly mounted on the rear of the fixed seat (6); the axial positioning pin (8) is fixedly mounted on the end of the push rod of the cylinder (7); the axial positioning pin (8) matches with a pin hole of a workpiece to be processed; an axial positioning block (14) is fixed on the base (2) at a position opposite to the axial positioning pin (8).

6. A new type of steering gear nut milling fixture according to claim 5, characterized in that: A guide block is mounted on the fixing seat (6), a guide through hole is provided on the guide block, and an axial positioning pin (8) passes through the guide through hole of the guide block.

7. The novel steering gear nut milling fixture according to claim 1 is characterized in that: A cavity with an open end is provided on the inner side of the oil cylinder seat (5), a hydraulic support cylinder (12) is fixedly installed in the cavity, and an inner rod of the hydraulic support cylinder (12) is fixedly connected to a radial positioning pin (13).

8. A milling process based on a new type of steering gear nut milling fixture, characterized in that: The following steps are included: ① After cleaning the cutting fluid and iron chips from the fixture, place the workpiece in the center of the fixed jaws (3) and offset it a certain distance in the direction of the cylinder (7); ② Start the cylinder (7), and push the axial positioning pin (8) through the action of the cylinder (7), so that the axial positioning pin (8) is pushed into the pin hole of the workpiece, and the workpiece is driven to move until it is in contact with the axial positioning block (14); ③ After the axial positioning of the workpiece is completed, the cylinder (7) sends a signal, and oil enters the left side of the piston chamber of the cylinder seat (5), causing the cylinder seat (5) to move leftward as a whole, so that the movable jaw (4) cooperates with the fixed jaw (3) to clamp the workpiece; ④ The action of the oil cylinder seat (5) is delayed for a period of time, and the hydraulic support cylinder (12) moves to contact the workpiece. After the contact, the gear milling machine starts to move to perform gear milling processing; ⑤ During the processing, most of the iron chips fall into the waist-shaped groove on the lower side of the fixed jaw (3) for collection, which is convenient for cleaning; ⑥ After the workpiece is processed, the movable jaw (4) is retracted, and the cylinder (7) is also restored to its original position. After the workpiece is taken out from the fixed jaw (3), the iron filings in the waist groove of the fixed jaw (3) are cleaned.

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