Groove rubbing process for vehicle door and vehicle body connecting shaft

Abstract

The invention relates to a vehicle manufacturing part, in particular to a groove rubbing process for a vehicle door and vehicle body linkage shaft, and solves the problem of the groove rubbing process of the linkage shaft. The method at least comprises the procedures of cold heading, groove rubbing, straight line rubbing and surface electroplating, the step of groove rubbing comprises rough machining and heat treatment, groove rubbing forming, groove inner side finishing and electrode roughening, and a groove rubbing plate for groove rubbing and a thread rolling plate for straight line rubbing are die steel subjected to surface treatment; wherein the tooth pitch of the groove rubbing plate is 8.7 mm, the tooth depth is 0.53 mm, the helical angle is 0 degree, the straight grain rubbing cutter plane is 0.06 / 0.08, the tooth pitch is 1.81 mm, the outer diameter is 6.44 / 6.48 mm, the tooth depth is 0.91 mm, the helical angle is 6 degrees and 25 minutes, the tooth length is 34.6 mm, the tip height is 0.6 mm, the tip angle is 20 degrees, and the cutter angle is 45 degrees. In the process of groove rubbing, enough machining allowance is reserved during rough machining, and then heat treatment is conducted. And through a thread rolling matching process, the production and processing efficiency is remarkably improved, and the quality of a finished product is more stable through a thread rolling process.

Description

Technical Field

[0001] This invention relates to a vehicle manufacturing component, and more particularly to a groove-forming process for the connecting shaft between a vehicle door and the vehicle body. Background Technology

[0002] Door hinge bolts are fundamental fasteners used in industrial applications to connect door bodies, and are components of the hinge assembly. This product consists of a separate bolt and nut structure with an L-shaped design. It is primarily used for connecting simple doors and for connecting car doors to the car body; a single car door requires two hinge bolts, one for the top and one for the bottom. Door hinge bolts must pass torque, tensile, and hardness tests to meet specified standards. Surface treatment processes include electroplating, Dacromet coating, zinc plating, and hot-dip galvanizing, and salt spray testing is conducted to verify corrosion resistance. Failure modes include metal fatigue fracture due to bolt strength not meeting design standards, uneven stress caused by installation defects, and defective products entering the production line due to loopholes in component inspection. Failure analysis utilizes CATIA engineering drawing and physical sample comparison technology.

[0003] Traditional manufacturing processes rely on CNC lathes, which have relatively low processing efficiency, processing only one workpiece at a time, and thus cannot meet market demand in terms of production capacity. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a tool for connecting the door and the vehicle body shaft. ditch Process.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is: a grooving process for the connecting shaft between a car door and a car body, which includes at least the processes of cold heading, grooving, straight-line grooving and surface electroplating. The grooving process includes rough machining and heat treatment, grooving forming, groove inner side trimming and electrode roughening. The grooving plate and the straight-line grooving tooth rolling plate are surface-treated mold steel.

[0006] The grooved plate has a tooth pitch of 8.7 mm, a tooth depth of 0.53 mm, and a helix angle of 0°. The straight groove cutting tool has 0.06 / 0.08 grooves, a tooth pitch of 1.81 mm, an outer diameter of 6.44 / 6.48 mm, a tooth depth of 0.91 mm, a helix angle of 6°25′, a tooth length of 34.6 mm, a tip height of 0.6 mm with a tip angle of 20°, and a cutting tool angle of 45°.

[0007] In the groove-forming process, sufficient machining allowance is left during rough machining before heat treatment, and the reference surface is finely ground. The groove-forming process uses a 7' pad to chamfer from the feed end, continuing to process until 50mm from the starting point, gradually reducing the machining amount until 80mm from the outlet.

[0008] The trimming angle for the inner side of the groove is 1°20′.

[0009] The electrode roughening is performed using electrical discharge machining (EDM) in the feed end area of ​​the workpiece.

[0010] The beneficial effects of the present invention: The present invention provides a rubbing tool for the connecting shaft between the car door and the car body. ditch The process involves rubbing ditch The supporting processes significantly improve production and processing efficiency, and the kneading process makes the quality of finished products more stable. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of the present invention. Detailed Implementation

[0012] like Figure 1 As shown, a grooving process for a door-body connecting shaft includes at least the steps of cold heading, grooving, straight-line knurling, and surface electroplating. The grooving step further includes rough machining and heat treatment, grooving forming, groove inner side finishing, and electrode roughening. The grooving plate and the straight-line knurling die are made of surface-treated mold steel (preferably DC53 steel). The grooving plate has a tooth pitch of 8.7 mm, a tooth depth of 0.53 mm, and a helix angle of 0°. The straight-line knurling cutter has a plane of 0.06 / 0.08 grooves, a tooth pitch of 1.81 mm, an outer diameter of 6.44 / 6.48 mm, a tooth depth of 0.91 mm, a helix angle of 6°25′, a tooth length of 34.6 mm, a tip height of 0.6 mm with a tip angle of 20°, and a cutter angle of 45°. During the rough machining step of grooving, sufficient machining allowance is left before heat treatment, and the reference surface is finely ground. The grooving process uses a 7' platen to chamfer the workpiece starting from the feed end, continuing until it reaches a position 50mm from the starting point, gradually reducing the machining amount until it reaches a position 80mm from the exit point. The trimming angle for the inner side of the groove is 1°20'. The electrode roughening process uses electrical discharge machining (EDM) in the feed end area of ​​the workpiece.

[0013] The further refinement process also includes: sawing the raw material according to the dimensions 40*30*330 / 350; milling the surface bevel, initially milling or planing a bevel on the upper surface of the workpiece; rough planing, using a planer to roughly shape the outline of the tooth plate; notching and riveting, machining notches or "riveting" at specific locations to add anti-slip textures or markings; grinding the tail angle, finely grinding a 20° tail angle; and the core process of thread rolling, using a thread rolling machine or special equipment to carve thread teeth on the tooth plate with parameters such as a pitch of 1.81mm, a helix angle of 6°25', and a cutter angle of 45°; and machining... Marking and marking: Marking and reference lines are engraved on the thread plate; Adding anti-slip teeth: Machining anti-slip teeth with parameters P2.0 (tooth pitch of 2.0mm); Rough milling and finish milling of the bevel: This is a bevel finishing process performed after thread hobbing, divided into rough and finish operations to ensure the dimensions and surface finish of the bevel; Chamfering: Chamfering the thread tooth tip or edge with parameters 65° and 46' for the chamfering tool angle; Pointing one tooth: Specially machining one tooth into a sharper shape for initial positioning or special functions; Lengthening: A finishing or buffing process that can be used to fine-tune the thread plate dimensions or improve surface quality; Quality inspection: Final inspection. A full dimensional inspection of the finished product is performed according to the inspection items below the table (tooth pitch, tooth depth, angle, tooth length, tip height, tip angle).

[0014] Rough machining and heat treatment: Note that you should first make a rough estimate of the allowance dimensions, and then perform the precision dimensions after heat treatment. This highlights the key production sequence. First, perform rough machining to leave sufficient machining allowance, then perform heat treatment (to improve the hardness and wear resistance of the toothed plate). The workpiece will deform after heat treatment, so the reference surface needs to be finely ground. Finally, perform the precision machining of the grooves.

[0015] Finishing the groove (grooving): Use a 7' angled pad to chamfer the groove at the feed end, starting at 50mm and continuing until 80mm from the outlet. This illustrates how to chamfer the groove. Using a 7' angled pad, start chamfering from the feed end and continue machining to 50mm from the starting point. Then, use a "dragging" motion (possibly gradually decreasing the machining amount) until reaching 80mm from the outlet. This ensures a smooth guide angle for the groove opening.

[0016] Groove inner side trimming: The inner side is trimmed with 1°20′. The inner side (side) of the groove is slightly trimmed at an angle of 1°20′. This may be to form a small draft angle or a specific functional surface.

[0017] Special treatment for the feeding section: The feeding section is then roughened with electrodes. In the feeding end area of ​​the workpiece, an electrical discharge (electrode) process is used to "roughen" the surface. The purpose of this is to increase the surface roughness of this area to enhance its "engagement" ability, prevent the workpiece from slipping during the rolling process, and ensure smooth feeding.

[0018] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention. At the same time, the basic principles, main features, and advantages of this invention have been shown and described above, which should be understood by those skilled in the art.

Claims

1. A grooving process for a hinge axis of a vehicle door and a vehicle body, characterized by, At least the processes of cold upsetting, grooving, straightening and surface plating, the process of grooving further comprises rough machining and heat treatment, grooving forming, inner side trimming of the groove and electrode roughening, the grooving plate and the tooth rolling plate of the straightening are die steel after surface treatment; The tooth distance of the grooving plate is 8.7mm, the tooth depth is 0.53mm, the spiral angle is 0°, the tooth distance of the straightening knife is 1.81mm, the outer diameter is 6.44 / 6.48mm, the tooth depth is 0.91mm, the spiral angle is 6°25', the tooth length is 34.6mm, the sharp tail height is 0.6mm, the sharp tail angle is 20°, and the knife angle is 45°.

2. A knurling process for a hinge pin of a vehicle door to body link as defined in claim 1 wherein, In the process of grooving, a sufficient machining allowance is left during rough machining, and then heat treatment is carried out, and the reference surface is finely ground.

3. A knurling process for a hinge pin for a vehicle door and body link as defined in claim 2 wherein, The grooving forming is carried out through a 7' pad, the chamfering starts from the feeding end, the machining amount is gradually reduced to the position 50mm away from the starting point, and the machining is carried out to the position 80mm away from the outlet.

4. A knurling process for a hinge pin for a vehicle door and body link as defined in claim 3 wherein, The trimming angle of the inner side trimming of the groove is 1°20'.

5. A knurling process for a hinge pin for a vehicle door and body link as defined in claim 4 wherein, The electrode roughening uses electric spark roughening in the feeding end area of the workpiece.

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