DE102007005886A1 - Spindle assembly manufacturing method for commercial vehicle, involves subsequently perforating and forging sleeve into hole cavity using punching die under formation of spindle assembly with center bore - Google Patents

Abstract

The method involves blocking a sleeve (1') with a truncated cone at a shaft end and with a center band (2) at another shaft end, where the sleeve is made from a completely round material. The sleeve is warmly inserted into a hole cavity for manufacturing a end contour and a center bore and centered using the center band. The sleeve is perforated and forged subsequently into the hole cavity using a punching die under formation of a spindle assembly with the center bore. Independent claims are also included for the following: (1) a forged spindle assembly for a commercial assembly (2) a device for manufacturing a spindle assembly.

Description

The The invention relates to a method for producing a steering knuckle, especially for a commercial vehicle; the steering knuckle made after and on a device for producing the same,

It is known steering knuckle, especially for commercial vehicles, made of round material to a blank with a truncated cone at a shaft end and with a centering collar at the opposite end to forge ahead and then to the leadership or to enable a passage of an axis a centered bore by means of a To train cutting process. Making a hole In the machining process is especially in high-strength materials very expensive and expensive and by drilling the fiber is disturbed in the steering knuckle. Furthermore will be long for such a precise Bore needed.

The Cutting reduces the strength of the steering knuckle and the Fiber flow is not ideal in the steering knuckle. The steering knuckle with a tubular one Section that merges into a funnel-like area is a heavily loaded one Part on which passing axles with wheels of a vehicle as well Brakes are attached. Finally, it is desirable to save material in order to have both a lower total vehicle weight, as well as lower material costs. This was with the stub axles according to the prior art, not the case because of the suboptimal Fiber course in the shaft after drilling larger shank wall thicknesses necessary were to the desired strength of the steering knuckle.

Of the present invention is based on the object, a simple Precise method Production of a steering knuckle, a steering knuckle and a Apparatus for the preparation thereof to create so steering knuckles with increased strength which avoid the disadvantages of the prior art.

The The object is achieved by a method having the features of the claim 1, a steering knuckle with the features of claim 6 and solved by a device having the features of claim 9. Advantageous developments result from the dependent claims.

It is according to the invention provided, from the round material not only a blank with a truncated cone to prefix, but in a subsequent step the blank in a hole die for making an axle hole and use subsequently the blank in the perforated die by means of a punch under Forming a final form-Achsschenkelkontur finished with axle hole zuschmieden. The fact that by punching in the perforated die of Fiber orientation in the blank aligned parallel to the surface of the steering knuckle a solidified forged axle stub can be made become.

The Task is also supported by a forged steering knuckle, in particular for commercial vehicles, the one fiber profile parallel to the knuckle surface in the axial direction (A), solved.

Of the Fiber course is thus coherent and not by machining, as stated in the prior art, destroyed or interrupted. This has the advantage that the steering knuckle is a heavy-duty Forged part with a long life and material savings across from usual Drilled parts possible is.

After all The invention also relates to an apparatus for manufacturing a stub axle, which has a punch and a perforated die as a forging sink has.

The Manufacturing process for the perforated stubby brings by double forging in contrast to the previous combination of forging and machining / drilling many Benefits with it. The production and cycle time is reduced considerably. The strength of the steering knuckle thus produced with the axle through hole for Vehicle axles is facing Drilled stub axles increased. The steering knuckle is highly resilient and has a long service life on.

Of the Steering knuckle can be in almost the same manufacturing environment in just two forging steps are made. This also brings logistic Manufacturing advantages.

One Forged centering collar prevents the punch from running. When punching the blank is preferably on the truncated cone and / or in particular Centered on the centering collar in the punching die. A centering of the Blank is important for punching in the right position done so that no skewing of the punch with risk of breakage the stub axle or at least a shortened service life of the steering knuckle, in particular due to a one-sided lack of material and a Excess material at the opposite Spot occurs. In such a non-centered punching can the swaging form in case of excessive loads destroyed become.

Preferably, the punch is used to improve the manufacturing quality and to increase tool life, cooled due to a lifetime extension of the tool. Thus, the punch wears slower and to a much lesser extent.

to exact centering of the punch against die and blank is the position of the punch to the hole die during assembly and during the Monitoring operation in the knuckle production device. This ensures that the punch goes angled and centered to the tool.

The Blanks can be forged on a press or a counterhammer. advantages therefor are not procedural.

preferred Dimensions of the Steering knuckles are a length from about 400-700 mm, in particular between about 400-500 mm with a hole diameter of about 45-80 mm preferably between about 50-70 mm. The Achsteller preferably has a diameter of about 45-80 mm, especially between 50-60 mm and a hole diameter of about 18-30 mm, preferably between about 21-26 mm up.

For the above described forging process in a device for manufacturing of the stub axle is advantageously a forging sink, in the engraving area of the shaft a ridge pitch for receiving Material surpluses, tinder etc. has. Thus, the engraving is not blown up during punching and fiber courses in the steering knuckle are formed advantageous. The ridge division picks up material that is displaced due to the hole to be machined and their dimensions are hanging on the size of the entire part from. For a steering knuckle for a commercial vehicle may have a ridge pitch of 10 mm or more be.

Prefers is a sliding control for an exact, centering positioning of the blank in the hole die provided under the punch, which the die and / or can adjust the punch. This ensures that the punch makes a highly accurate axis hole in the steering knuckle. The life of the tool is advantageously extended.

The As is known to the person skilled in the art, slide control has, of course, sensors, Actuators, an evaluation circuit and a corresponding control circuit on. In this case, the punch is preferably at an angle to the perforated die and centered for that Forging movable.

It It is understood that the above and below to be explained features not only in the respective specified combination, but also can be used in other combinations.

The Invention will be described below with reference to an embodiment with reference on the associated Drawings closer explains the invention by no means to the illustrated size and dimensional relationships limited is. Show:

1 a sectional view of a forged blank with forged truncated cone,

2 another sectional view of the forged blank of the 1 offset by 90 °,

3 a sectional view of the finished perforated stub axle,

3a Fiber course in the section of the 3

4 a sectional view of the finished perforated stub axle of 3 offset by 90 ° and

4a the fiber flow in the section of the 4 ,

The 1 shows a knuckle blank made of round material 1' , From Rundmaterial-Ausgangsteil massively a truncated cone is forged on a counter-impact hammer. All forging steps are carried out warm, ie with a heated component. At the shaft end of the blank 1' becomes in the first forging a Zentrierbund 2 chained. The for centering forged centering prevents bleeding of the punch in the second forging / punching process. There goes a punch with a special cutting geometry in the second forging process in the Lochmatritze through the truncated cone in the full material of the blank shaft and expands the shaft while displacing the material and producing a through hole in the shaft. An obliquely running punch, which is not exactly centered, could destroy the die in the most extreme case, therefore, the exact centering of the blank in the punch with respect to the punch is very important.

The steering knuckle blank 1' has at its shaft end the centering collar 2 on and at the opposite end a plate 3 on, which can also be referred to as dome-shaped or bell-shaped. The steering knuckle 1 is provided in particular in commercial vehicles respectively on the vehicle axles.

According to the invention, the steering knuckle blank 1' in the second forging step by Schmie punched and forming an axle hole. For this purpose, the blank made from the round material 1' Inserted in a perforated die and then in the perforated die by means of a punch with the formation of a knuckle contour with perforated shaft with axle hole 4 ready forged. It turns that into the 3 and 4 shown axle hole 4 ,

To the forged axle hole according to the invention 4 The blank on the truncated cone and / or on the centering collar is safe to manufacture with a high production quality and a low tool wear 2 in a perforated die, ie in the tool centered. For the exact positioning of the punch to the hole die during assembly and during operation of the steering knuckle, the position of the same is monitored. If necessary, the position is precisely adjusted with a sliding control. The punch is angled for the hole die and centered for forging movable. The shift control comprises sensors, actuators, an evaluation circuit and a control circuit for this purpose. The punch will also be cooled. Thus, the life of the punch is increased, reduces wear of the punch and increases the manufacturing quality of the steering knuckle.

The forging die sink, also referred to as a punch die, points to the formation of the axle hole 4 in the engraving area of the centering collar an expansion joint / ridge pitch for receiving excess material and scale, etc. on. The expansion joint depends on the hole diameter.

The forged steering knuckle 1 , like in the 3 and 4 shown, has a fiber profile 6 parallel to the surfaces in the axial direction. Thus, the fiber flow 6 not interrupted by cutting, as in the prior art stub axles in which the axle holes are drilled, but contiguous. This results in a high-strength forged component that best matches the life of a commercial vehicle.

Preferred dimensions of the steering knuckle are a length of about 400 mm to 700 mm, in particular between 400 and 500 mm, a hole diameter of about 25 to 80 mm, preferably between 50 to 70 mm. Other preferred dimensions are a Achsteller 3 with a diameter of about 45 to 80 mm, preferably between 50 to 60 mm, and a hole diameter of 18 to 30 mm, preferably between 21 to 26 mm for smaller stub axles.

While the Invention has been described in detail with reference to preferred embodiments, It will be apparent to those skilled in the art that various alternatives and embodiments to carry out the Invention are possible within the scope of the claims.

1'

blank with forged truncated cone

1

perforated journal

2

spigot on the blank

3

truncated cone

4

axle hole

6

grain in the finished stub axle

Claims (11)

Method for producing a steering knuckle ( 1 ), in particular for a commercial vehicle, wherein - from a solid round material a blank ( 1' ) with a truncated cone at one end and a centering collar ( 2 ) is forged at the other end of the shaft, - the blank ( 1' ) warm into a perforated die for the production of the final contour and an axis hole ( 4 ) and by means of Zentrierbunds ( 2 ), and - the blank ( 1' ) then in the perforated die by means of a punch to form the finished stub axle ( 1 ) with axle hole ( 4 ) is finished punched and forged. Method according to claim 1, characterized in that that the position of the punch to the punch die during operation the punching device monitors becomes. Method according to claim 1 or 2, characterized that the punch is cooled becomes. Method according to one or more of the preceding claims 1 to 3, characterized in that the blank on a counter-impact hammer or a press is forged. Method according to one or more of the preceding claims 1 to 4, characterized in that the forming steps are carried out warm. Forged steering knuckle ( 1 ), in particular for utility vehicles, preferably produced by a method of claims 1 to 6, which has a fiber course ( 6 ) parallel to the knuckle surface in the axial direction (A). Forged steering knuckle ( 1 ) according to claim 6, characterized in that it has a length of about 400-700 mm, in particular between about 400-500 mm and a hole diameter of about 45-80 mm, preferably between about 50-70 mm. Forged stub axle according to claim 6 or 7, characterized in that it has a Achsteller ( 8th ) with a diameter of about 45-80 mm, in particular between about 50-60 mm and an axle hole ( 4 ) in the shaft with a diameter of about 18-30 mm, preferably between about 21-26 mm. Device for producing a steering knuckle ( 1 ) according to claim 6-8, with a forging die for punching a Achsschenkelrohlingschaft and finish forging a truncated cone, a punch and a perforated die as a forging with provided in the engraving area of the centering ridge division for receiving excess material, scale, etc. during forging. Apparatus according to claim 9, characterized in that a sliding control for an exact, centering positioning of the blank ( 1' ) is provided in the perforated die under the punch, which can adjust the Lochmatrize and / or the punch. Device according to one of claims 9 to 10, characterized that the punch to the hole die is angled and centered movable is.