CN100574926C - Gear-box planetary gear shaping die - Google Patents

Abstract

Gear-box planetary gear shaping die belongs to the planetary processing mold of car automatic gear-box, and the forging force that overcomes existing forging mold is big, and blank requires harsh, and the problem that die life is low is to satisfy automatic gearbox of vehicles planetary gear forming requirements.The present invention is made of symmetrically arranged upper die and lower die up and down, and upper and lower punch end face is boss, on the low punch boss splitter box is set; Upper and lower drift shoulder stretches into profile of tooth die 1～2mm in the extruding end-state.Also the rotation ejecting mechanism can be set, low punch can rotate simultaneously ejecting, and can forge the bigger helix cylindrical gear of helical angle.The present invention is simple in structure, is easy to make, install, and can realize single drift extruding according to different mould bases and equipment, also can realize two drift subtend extruding; Can realize the extruding of large helix angle gear; Plastic force is little, and cutting stock precision requires low.

Description

Gear-box planetary gear shaping die

Technical field

The invention belongs to the planetary processing mold of car automatic gear-box, particularly a kind of gear-box planetary gear shaping die.

Background technology

The spiral cylinder planetary gear is used for the car automatic gear-box, is force transferring part important in the car.Its mechanical property is directly determining the security and the stability of car.Conventional method mainly adopts the processing of pinion cutter rolling cut, because this method is a machining, metallic fiber is cut off, and makes the intensity of gear reduce, and shorten service life.Recently the someone adopts pressing method production, propositions such as E.Deoge adopt the drift of cored bar and the die structure of floating to carry out forge hot, see E.Doege, R.Bohnsack, Closed die technologies for hot forging, Journal of Materials ProcessingTechnology, Vol.98 (2000) 165-170; Y.B Park, D.Y Yang, at Finite elementanalysis for precision cold forging of helical gear using recurrent boundary, Proceedings of the Institution of Mechanical Engineers, Vol.212 (1998) partB:231-240; With J.C CHIO etc., at The forging of helical gears (I): Experimentsand upper-Bound analysis Im.J.Mech.Sci.Vol.40:325-337; Propose to adopt guidance type mould structure and lock type mould structure to carry out the extruding of helical gear, the mould that is adopted, drift and concave die cavity all are designed to the helix cylindrical gear shape, counterdie is the profile of tooth mould, after blank put into the profile of tooth die, patrix is matched moulds with it, adopts the flat-bottom punch extrusion billet then, formed gear; But be to use this mould, adopt complete closed-die forging, when the blank cutting stock precision is low, a small amount of increase of blank volume will cause the rapid rising of forging force, increase the pressure in the mold cavity, reduced die life significantly, require the high blanking cost that increased because of cutting stock precision simultaneously.

Summary of the invention:

The invention provides a kind of gear-box planetary gear shaping die, the forging force that overcomes existing forging mold is big, and blank requires harsh, die life problem low and forging depanning difficulty, to satisfy automatic gearbox of vehicles planetary gear forming requirements.

A kind of gear-box planetary gear shaping die of the present invention, constitute by symmetrically arranged upper die and lower die up and down, last mode structure is: upper push-rod contacts with upper punch, upper punch passes the patrix cushion block successively, goes up barrel, last barrel overcoat has the upper cavity die shrink ring, and patrix cushion block and upper cavity die shrink ring are with the patrix overcoat outward; Following mode structure is: lower push-rod contacts with low punch, and low punch passes counterdie cushion block, blanking tube, profile of tooth die successively, and blanking tube and profile of tooth die are with the lower cavity die shrink ring outward, and counterdie cushion block and lower cavity die shrink ring are with the counterdie overcoat outward; It is characterized in that:

(1) described upper and lower punch end face is boss; Low punch end face boss has splitter box;

(2) described upper and lower drift shoulder stretches into profile of tooth die 1～2mm in the extruding end-state, makes upper and lower drift form the technological compensa tion space with the teeth groove position of profile of tooth die respectively, to hold unnecessary material, reduces plastic force, avoids overload.

Described gear-box planetary gear shaping die is characterized in that:

(1) described counterdie cushion block is made of cushion block on the counterdie and counterdie lower cushion block, is equipped with roller gear between cushion block and the counterdie lower cushion block on the counterdie, roller gear and the tooth bar engagement of passing cushion block on the counterdie, counterdie lower cushion block and counterdie overcoat; Tooth bar is fastened on the side direction oil cylinder on the forcing press;

(2) described low punch is with described roller gear and back-moving spring successively, and low punch is connected by feather key with described roller gear, low punch and described roller gear axial sliding fit; Described low punch, roller gear, feather key and described tooth bar constitute the rotation ejecting mechanism.

Use mould of the present invention, the Forging Technology flow process is: blanking → spheroidizing → surperficial mechanical process → phosphatization saponification processing → cold extrusion → turning is handled.In the cold extrusion forging process, adopt mould of the present invention.

Adopt mould of the present invention,, make metal streamline complete owing to adopt the cold extrusion forging and molding to replace machined, the intensity and the comprehensive mechanical performance of gear have been improved, increase the transmission capacity of moment of torsion, improved the bearing capacity and the service life of gear, improved production efficiency simultaneously.

Compare with forge hot, adopt mould of the present invention, blank manufacturing process does not need boring, and cold closed-die forging forging surface quality, dimensional accuracy, forging mechanical mechanics property all are better than hot forging, and cold closed-die forging production work environment is good; Compare with existing guidance type mould structure, mould structure of the present invention is simpler, and die separates manufacturing with barrel, is easy to make, and installs; Compare low punch with existing lock type mould and all do not adopt flatly, help material and flow and to fill type; The present invention utilizes low punch and profile of tooth concave die cavity to fill the type position at last at material and forms the technological compensa tion space, effectively reduces plastic force, holds excess stock, has reduced the requirement to cutting stock precision, has reduced the blanking cost.

Mould of the present invention is provided with the rotation ejecting mechanism, side direction oil cylinder on the forcing press provides draws, thrust is by tooth bar, gear, feather key transmission, form the low punch moment of torsion, make low punch can rotate simultaneously ejecting, can forge the bigger helix cylindrical gear of helical angle.

Mould of the present invention can be realized different fashion of extrusion according to different mould bases and press types.Any one drift is fixed, can be realized single drift extruding,, can realize the subtend extruding when two drifts move simultaneously.

Description of drawings

Fig. 1 is a mold integral structural representation of the present invention;

Fig. 2 is the A-A cross-sectional view of Fig. 1;

Fig. 3 (A) is single drift extrusion forging blowing state and matched moulds view;

Fig. 3 (B) is single drift extrusion forging matched moulds state and extruding end-state schematic diagram;

Fig. 4 (A) is two drift subtend extruding blowing states and matched moulds view;

Fig. 4 (B) is two drift subtend extruding matched moulds states and extruding end-state schematic diagram.

The specific embodiment:

As shown in Figure 1, mould of the present invention comprises cushion block 6 on upper push-rod 1, patrix cushion block 2, patrix overcoat 3, upper cavity die shrink ring 4, lower cavity die shrink ring 5, the counterdie, counterdie lower cushion block 7, feather key 8, counterdie overcoat 9, lower push-rod 10, low punch 11, roller gear 12, tooth bar 13, back-moving spring 14, blanking tube 15, profile of tooth die 16, technological compensa tion space 18, goes up barrel 19, upper punch 20.

Mold work process and forging forming process are shown in Fig. 3 (A), Fig. 3 (B) during single drift extrusion molding, and Fig. 3 (A) left-half is the blowing state, and Fig. 3 (A) right half part is the matched moulds state; Fig. 3 (B) left-half is the matched moulds state, and Fig. 3 (B) right half part is the extruding end-state.Shown in Fig. 3 (A) left-half, when the mold of being made up of upper push-rod 1, patrix cushion block 2, patrix overcoat 3, upper cavity die shrink ring 4, last barrel 19, upper punch 20 is in upper limit position, blank 17 vertical profile of tooth die 16 die cavities that insert; Then shown in Fig. 3 (A) right half part and Fig. 3 (B) left-half, upper and lower mould closure; Thereafter shown in Fig. 3 (B) right half part, upper punch 20 continues descending extrusion billet 17, and after blank was full of profile of tooth die 16, unnecessary material flowed into the technological compensa tion space 18 at profile of tooth die two ends.After this mould the first half die sinking that moves up, low punch 11 eject the forging rotation pushing away on the lower push-rod 10 to drive under the effect of rotation of roller gears 12 with tooth bar 13.Then low punch 11 drives at tooth bar 13 under the effect of the turning effort of roller gears 12 and back-moving spring 14 and resets.

Mold work process and forging forming process are shown in Fig. 4 (A), Fig. 4 (B) during two drift subtend extrusion moldings, and Fig. 4 (A) left-half is the blowing state, and Fig. 4 (A) right half part is the matched moulds state; Fig. 4 (B) left-half is the matched moulds state, and Fig. 4 (B) right half part is the extruding end-state.Shown in Fig. 4 (A) left-half, when the mold of being made up of upper push-rod 1, patrix cushion block 2, patrix overcoat 3, upper cavity die shrink ring 4, last barrel 19, upper punch 20 is in upper limit position, blank 17 vertical profile of tooth die 16 die cavities and the blanking tubes 15 of inserting; Then shown in Fig. 4 (A) right half part and Fig. 4 (B) left-half, upper and lower die closure; Thereafter shown in Fig. 4 (B) right half part, upper punch 20 and low punch 11 subtend extrusion billets 17, after blank was full of the profile of tooth die, unnecessary material flowed into the technological compensa tion space 18 at profile of tooth die 16 two ends.After this mould the first half die sinking that moves up, low punch 11 eject the forging rotation pushing away on the lower push-rod 10 to drive under the effect of rotation of roller gears 12 with tooth bar 13.Then low punch 11 drives at tooth bar 13 under the effect of the turning effort of roller gears 12 and back-moving spring 14 and resets.

Claims (2)

1. gear-box planetary gear shaping die, constitute by symmetrically arranged upper die and lower die up and down, last mode structure is: upper push-rod contacts with upper punch, upper punch passes the patrix cushion block successively, goes up barrel, last barrel overcoat has the upper cavity die shrink ring, and patrix cushion block and upper cavity die shrink ring are with the patrix overcoat outward; Following mode structure is: lower push-rod contacts with low punch, and low punch passes counterdie cushion block, blanking tube, profile of tooth die successively, and blanking tube and profile of tooth die are with the lower cavity die shrink ring outward, and counterdie cushion block and lower cavity die shrink ring are with the counterdie overcoat outward; It is characterized in that:

(1) described upper and lower punch end face is boss; Low punch end face boss has splitter box;

(2) shoulder of described upper and lower plunger rod portion and end face boss intersection stretches into profile of tooth die 1～2mm in the extruding end-state, make upper and lower drift form the technological compensa tion space with the teeth groove position of profile of tooth die respectively, to hold unnecessary material, reduce plastic force, avoid overload.

2. gear-box planetary gear shaping die as claimed in claim 1 is characterized in that:

(1) described counterdie cushion block is made of cushion block on the counterdie and counterdie lower cushion block, is equipped with roller gear between cushion block and the counterdie lower cushion block on the counterdie, roller gear and the tooth bar engagement of passing cushion block on the counterdie, counterdie lower cushion block and counterdie overcoat; Tooth bar is fastened on the side direction oil cylinder on the forcing press;

(2) described low punch is with described roller gear and back-moving spring successively, and low punch is connected by feather key with described roller gear, low punch and described roller gear axial sliding fit; Described low punch, roller gear, feather key and described tooth bar constitute the rotation ejecting mechanism.

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