CN100441369C - One-time cold extrusion forming process for motorcycle steering shaft tapered riser - Google Patents

Abstract

A one-time cold extrusion forming process for motorcycle direction shaft cone riser, the invention relates to a cold extrusion processing method for a tapered riser, which is a process for secondary or tertiary cold extrusion of a motorcycle direction shaft cone riser improvement of. The main features of the present invention are: on the four-column hydraulic press, upper and lower cylinder molds with very rigid guide bushings are installed, rod-shaped punches are rigidly assembled in the upper cylinder mold, and three concentric molds are assembled in the lower cylinder mold. The concave die of the external shape of the tapered motorcycle standpipe formed by the core, thereby ensuring the success of the one-time cold extrusion forming process of the tapered motorcycle standpipe. Greatly improve product quality and production efficiency. At the same time, it is processed into finished products for subsequent finishing, which reduces the amount of cutting, saves man-hours, and improves efficiency and benefits.

Description

One-time cold extrusion forming process for motorcycle steering shaft tapered riser

(1) Technical field

The invention relates to a mechanical processing method of a tapered riser and its equipment, in particular to a process and equipment for cold extrusion processing to produce a motorcycle steering shaft tapered riser.

(2) Technical background

According to the new investigation, the most advanced process and equipment for producing and processing motorcycle steering shaft tapered risers at present were disclosed on March 30, 2005. Method and device for tapered riser in the direction of motorcycle"; and a utility model patent, 200420060928.0 "Cold extrusion production of tapered riser for motorcycles" and another utility model patent: 200420060929.5, its name is "cold extrusion Shrinking hoop reaming device for extrusion production of motorcycle direction tapered riser".

The above-mentioned cold extrusion method and device for producing motorcycle direction tapered risers is indeed much more advanced than the original method of hot forging, in which the steel pipe is heated and then forged into a cone shape, and then its mechanical cutting is processed. However, There are still many deficiencies.

At first, it is two or three times cold extrusion forming, just can complete the cold extrusion forming processing of a motorcycle direction shaft taper standpipe, thereby its production efficiency and economic benefit are all low.

Secondly, there are still a few shortcomings:

1. The upper and lower molds in the full forming device in the patent No. 200420060928.0 have no guiding device, and their coaxiality is difficult to maintain accurately for a long time, so the stability and accuracy of the formed workpiece will be affected.

2. In the hoop reaming device in Patent No. 200420060929.5, the upper and lower molds do not have direct guiding devices. The vertical distance of the hole is short, so its guiding rigidity is weak and the guiding effect is poor. In the device below, the buffer support plate is used to guide the reaming rod mold, but because the buffer support plate below has no guide column to connect with the guide template in the upper die Connected to ensure the working coaxiality of the upper and lower dies. Therefore, in the actual cold extrusion work, the asymmetric horizontal component force of the huge working pressure generated by it may cause the upper and lower dies to produce a larger coaxial Degree deviation, or seriously affect the coaxiality accuracy of the cold extruded workpiece, or accelerate the surface wear of the upper punch and the lower die, shorten the life of the die, and further affect the geometric dimension accuracy of the cold extruded workpiece.

What's more serious is that since the guide formwork runs on the vertical shaft of the frame, the excessive horizontal component force generated by the non-axial operation of the upper and lower molds will aggravate the wear of the upper guide formwork hole and the vertical shaft of the frame, not only the reverse It increases the non-concentricity of the upper and lower molds and reduces the working rigidity, and also affects the service life of the vertical shaft of the frame, thereby shortening the service life of the entire frame and causing additional economic losses.

It can be seen that, with the hoop reaming device of No. 200420060929.5 utility model patent, the irregular deformation of the cold-extruded conical standpipe is relatively large, and as the number of extrusions increases, the irregular deformation will also decrease. It is getting bigger and bigger, and the patent application number that has been announced is CN200410040546.6. In the invention patent, the first is to use the hoop reaming device of the utility model patent of 200420060929.5 to carry out preliminary cold extrusion processing on the steel pipe to form a preliminary formed conical vertical pipe, and then use the plump forming device in the utility model patent No. 200420060928.0 to cold-extrude the initially formed tapered riser again to overcome the irregular deformation of the initially formed tapered riser, but this correction The overcoming effect is very limited because the structure of the plump forming device is too simple, and the upper and lower dies have no guiding device. Therefore, the dimensional accuracy and coaxiality of the final extruded tapered riser are relatively low.

In order to overcome the above-mentioned disadvantages, the present invention uses one-time cold extrusion forming process to process motorcycle direction shaft tapered riser to replace secondary or three cold extrusion forming process, so as to improve efficiency, improve product quality, save cost and increase benefit.

In order to achieve the success of one-time cold extrusion forming to process the tapered riser of the motorcycle direction shaft, the present invention adopts a cold extrusion upper punch and a lower die with guide column sleeves to form a high-rigidity and high-strength cold extrusion device. Instead of the aforementioned too simple, too poor rigidity, the upper and lower molds have no direct guide device for shrinking hoop reaming and plump forming devices, so as to obtain high-quality cold extrusion products.

(3) Contents of the invention:

The process route of the present invention is: first blank the steel pipe, then phosphate it, and then place it in a high-rigidity and high-strength mold with a guide device installed on the working table of the hydraulic press, that is, it will be placed between the rod-shaped punch and the reaming die. Core, tapered mold core and necking mold core concentrically form the outer shape of the motorcycle steering shaft tapered riser tube into the concave die, and cold extrude it into a motorcycle steering shaft tapered riser blank at one time, and then pour it Angle, on the CNC lathe, the bearing position d at the upper end of the refined blank of the motorcycle steering shaft taper riser and the bearing position f in the middle of the motorcycle steering shaft tapered riser fine blank, the motorcycle steering shaft cone Between the bearing position d segment of the shape riser fine blank and the bearing position f segment in the middle is the transition segment e segment; then finish the k segment at the lower end of the motorcycle direction axis tapered riser fine blank; then, in the thread rolling The machine rolls the thread j section between the k section at the lower end of the motorcycle steering shaft tapered riser blank and the middle bearing position f section, and finally obtains the motorcycle steering shaft tapered riser finished product.

The key point of the present invention is the high-rigidity mold of its one-time cold extrusion forming process motorcycle direction shaft taper standpipe, and its structure is:

A high-rigidity formwork is composed of upper and lower parallel formworks equipped with two sets of guide column sleeves, and upper and lower cylindrical forms respectively inlaid and fixed on the formwork concentrically.

The upper formwork is connected with the sliding workbench of the four-column hydraulic press, and the lower formwork is connected with the base workbench of the four-column hydraulic press. It is characterized by: two pieces of guide sleeves connected with the upper formwork and stabilized with guide sleeves, and connected with the lower formwork and stabilized with guide column seats The two guide pillars are opposite to each other, and the guide sleeve and the guide pillars are matched and slid on the respective paired concentric lines; the upper cylinder mold and the lower cylinder mold are concentric, and are respectively vertically embedded and connected to the upper template and the lower mold with screws On the template, use the upper backing plate, solid mold sleeve and upper pressing plate to fix the rod-shaped punch on the upper cylindrical mold, and use the lower backing plate, the ejection frame mold and the lower pressing plate to connect the concentric reaming core and cone The shaped mold core and the necking mold core are concentrically embedded and fixed in the lower cylinder mold, and the lower platen and the lower cylinder mold are connected together by bolts; There are lower ejector rods, ejector blocks and upper ejector rods.

The rod-shaped punch is fixed on the upper cylinder mold with the upper backing plate and the upper pressing plate, and is fastened with threads; the lower die is installed in the lower cylindrical mold by three circular modules with different inner holes, and is fixed by the lower backing plate and the lower pressing plate. It is fastened concentrically.

The advantages of the present invention are as follows: Firstly, the time consumption of one-time cold extrusion of the present invention is more than half that of the single workpiece of secondary or three-time cold extrusion, therefore, the work efficiency is high, manpower and material resources are saved, costs are reduced and benefits are increased. The second is: because the cold extrusion forming die of the present invention is rigid and has a long-distance guide of the guide column sleeve, the straightness of the workpiece cold extruded, especially the two bearings at the tapered ends of the tapered riser The high requirement of coaxiality at the position can be satisfied by the repeated extrusion of multiple workpieces, so that the quality of cold extrusion products can be guaranteed with a high and continuous standard. The third is: because the mold device of the present invention has a guide column sleeve and the mold core is installed in the cylindrical mold, its rigidity is greatly improved, so a larger cold extrusion force can be used to form and extrude the tapered riser, so the obtained The mechanical strength of the tapered riser has been improved, so that its service strength performance has been improved. Its 4th is: because the technology phosphating tapered riser blank of the present invention, it is better than existing technology anti-rust effect after oil extrusion, so its service life is improved to some extent. The fifth is: because the guide column sleeve in the mold device of the present invention bears most of the wear aggravated by the irregular horizontal component force of cold extrusion, thereby reducing the wear of the hydraulic press column during work and prolonging the service life of the hydraulic press , thus increasing the economic benefit.

(4) Description of drawings

Fig. 1 is a die sectional view of the cold extrusion process of the present invention.

Figure 2 is a cross-sectional view of the blank blank.

Fig. 3 is a cross-sectional view of the fine billet after one-time cold extrusion of the present invention.

Fig. 4 is a finished product view of the one-time cold extruded fine blank of the present invention after finishing in Fig. 3 .

(5) Specific implementation methods:

An embodiment of the present invention will now be described in detail in conjunction with the drawings.

As shown in Figure 1, (1) is the sliding workbench of the four-column hydraulic press; (2) is the column of the hydraulic press, and the cylinder mold (5) is vertically embedded on the upper template (3) and connected with screws. Upper formwork (3) is fixed on the hydraulic press sliding workbench (straight) with pressing plate and stud. Upper backing plate (4), rod-shaped punch (9) and solid mold cover (6) are housed in the upper cylinder mold (5), and it is fixed on the upper cylinder mold (5) with the upper pressing plate (7), and Pressing plate (7) is fixedly connected with upper cylinder mold (5) with screw. 2 guide sleeves (8) are assembled on the upper template (3), and stabilize it with the guide sleeve seat (26), and the guide sleeve seat (26) is fixed on the upper template (3) with bolts.

2 pieces of guide columns (13) are assembled on the lower formwork (24), and have guide column bases (25) firmly, and guide column bases (25) are connected on the lower formwork (24) with bolts. Lower template (24) is fixed on the hydraulic press base workbench (23) with pressing plate and bolt.

The lower cylinder mold (14) is vertically embedded on the lower formwork (24), and is fixedly connected with bolts. The lower cylinder mold (14) is equipped with a lower backing plate (19) and an ejection frame mold (17) sequentially from the bottom; then the necking core (15), the tapered core (12) and the expansion core (11) Embedding and concentric assembly are carried out successively, and the inner holes are concentrically connected to form the external shape of the motorcycle direction shaft tapered standpipe. And it is fixed in the lower cylinder mold (14) with pressing plate (10). Fix and connect with screws between the lower pressing plate (10) and the lower cylinder (14).

The ejection block (18) built in the ejection frame mold (17) is connected with the lower backing plate (19), and the ejection seat (21) is connected to each other with the hydraulic press ejection column (22) with threads, and the ejection seat (21) can be Push the lower ejector rod (20) to drive the ejector block (18) to move upwards, thereby pushing the upper ejector rod (16) to eject the cold-extruded workpiece upwards to achieve the purpose of demoulding.

The two guide sleeves (8) are assembled concentrically with the corresponding guide posts (13) respectively. The upper cylinder mold (5) and the lower cylinder mold (14) are concentrically assembled to ensure that the rod-shaped punch (9) and (11), (12), (15), and the inner holes of the three mold cores form the motorcycle direction axis cone The outer shape of the riser is concentric with the die.

As shown in Figure 2, it is the straight steel pipe blank (27) of blanking, after it is phosphorized, it is cold-extruded into the motorcycle direction axis taper of Figure 3 in the forming die of the present invention in Figure 1 Riser fine blank (28), the rod-shaped punch (9) determines the internal shape of this fine blank (28), and the reaming core (11), tapered core (12) and necking core (15 ) combined shape of the inner hole determines its outer shape.

Among them, section a is the straight pipe part for reaming, section b is the tapered part, and section c is the necking part.

As shown in Figure 4, it is the final finished product (29) of the motorcycle direction shaft tapered standpipe after the machining of the fine blank (28), and the j section is a thread in total, and the d section f section is a bearing position.

Claims (2)

1, directional axial conical standpipe process of motorcycle by disposable cold extruding formative machining, the straight shape steel pipe of blanking blank (27) at first, it is characterized in that: with straight shape steel pipe blank (27) phosphatization, then with it at bar-shaped punch (9) and reaming core rod (11), in the motorcycle direction axial cone shape standpipe outer shape die that taper core rod (2) and necking down core rod (15) are formed with one heart, disposable cold-extruded is pressed into the smart blank (28) of motorcycle direction axial cone shape standpipe, then with its chamfering, on numerically controlled lathe, the bearing position f section at the bearing position d section of the smart blank of finish turning motorcycle direction axial cone shape standpipe (28) upper end and the smart blank of motorcycle direction axial cone shape standpipe (28) middle part is a changeover portion e section between the bearing position d section of the smart blank of motorcycle direction axial cone shape standpipe (28) and the bearing position f section at middle part; The k section of the smart blank (28) of finish turning motorcycle direction axial cone shape standpipe lower end again; Then, rolling the k section that is positioned at the smart blank (28) of motorcycle direction axial cone shape standpipe lower end and the screw thread j section between the f section of bearing position, middle part on the screw-rolling machine, draw motorcycle direction axial cone shape standpipe finished parts (29) at last.

2, for realizing that the described directional axial conical standpipe process of motorcycle by disposable cold extruding formative machining devices needed of claim 1 frock is: cope match-plate pattern (3) links to each other with the sliding table (1) of four-column hydraulic press, lower bolster (24) links to each other with the base worktable (23) of four-column hydraulic press, it is characterized in that: link to each other with cope match-plate pattern (3) and with firm two fairleads (8) of guide sleeve seat (26) with link to each other with lower bolster (24) and distinguish relatively with firm two leads (13) of the column base (25) that leads, described fairlead (8) cooperates slip with lead (13) on the concentric line that matches separately; Last cylinder mould (5) is concentric with following cylinder mould (14), and vertical respectively setting-in and be connected on cope match-plate pattern (3) and the lower bolster (24) with screw, with upper padding plate (4), solid model cover (6) and top board (7) with bar-shaped punch (9), be fixed on the cylinder mould (5), with lower bolster (19), eject reaming core rod (11), taper core rod (2) and necking down core rod (15) that frame mould (17) and lower platen (10) will rabbet with one heart with one heart interlocking be fixed on down in the cylinder mould (14), and lower platen (10) and following cylinder mould (14) are linked together with bolt; Hydraulic press ejects post (22) and upward ejects seat (21) with being threaded, and ejects on the seat (21) and knock-pin (20) is housed down successively, angled slide block (18) and last knock-pin (16).

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