CN1168555C

CN1168555C - Dividing tandem mill for steel ball blanks

Info

Publication number: CN1168555C
Application number: CNB021049203A
Authority: CN
Inventors: 王海儒; 史荣
Original assignee: Yanshan University
Current assignee: Yanshan University
Priority date: 2002-03-09
Filing date: 2002-03-09
Publication date: 2004-09-29
Anticipated expiration: 2022-03-09
Also published as: CN1381319A

Abstract

The present invention relates to the field of plasticity forming of metal, and particularly relates to a cutting type continuous rolling mill for steel ball blanks. The present invention is characterized in that rollers (19) of a two-roller horizontal mill (6) are combined and a bore of the roller is composed of a roller ring (25) and a periodic ring (26); a bevel gear (39) above the coaxial line of a vertical roller (38) is meshed with a gear (40) on a shaft (41); the shaft (41) is supported by a supporting frame (42) fixed to a mill frame (37); a guide wheel (8) for periodic synchronization is connected to clamping plates (47) through a bolt, and the clamping plates (47) are fixed to the shaft (41) through keys (46). The forming process of the ball blanks of the present invention is accomplished by stepped forging of the rollers carrying out in the bore of the vertical roller, and a rolled piece does not rotate in the whole deformation process, so that the defects of skew rolling of a steel ball can not occur and the forming quality is enhanced. The rate of material utilization can reach up to over 94%, and the production rate is apparently higher than that of processes of cold heading and screw-hole type skew rolling.

Description

Dividing tandem mill for steel ball blanks and moulding process thereof

Technical field

The present invention relates to field of metal plastic shaping, particularly relate to a kind of dividing tandem mill for steel ball blanks.

Background technology

At present, the main means of production of steel bearing balls is to adopt screw groove diagonal rolling and cold heading technique.Though screw groove diagonal rolling has higher productivity ratio, on the deformation mechanism since workpiece in forming process around self axle rotation, under the effect of alternation tension, it is loose or form the hole to certainly lead to heart portion, this is a kind of potential hidden danger of quality; Cold upsetting production technological forming reliable in quality, but impact load is big, die wear is fast, and productivity ratio is not high yet.

Since half a century, people are just constantly exploring the new method of steel ball moulding, document US 2,269, and 889 1942 and US2,801,556 1957 is patents of invention that USPO was authorized respectively at nineteen forty-two and nineteen fifty-seven.These two patents are raw material with the round steel all, earlier the round steel axial rolling is become elliptic jet on a kind of continuous forming machine, and then elliptical rolled piece is carried out the periodic ball forming, at last spheroid are separated with connecting band.FR1,327,234 1963, then four tandem mill moulding adopting flat-grade separation to replace, drive separately.No matter be to adopt two cover transmission systems, or the quadruplet transmission system, for performance period the section tandem rolling all will be difficult.

Chinese patent (ZL97110455.7) steel ball bloom continuous rolling mill, two flat-grade separations that adopt collective's transmission are for milling train moulding and mechanical synchronization, and wherein first roll pass cycle can be regulated within the specific limits, to adapt to the synchronous pitch in second road.Though can satisfy this die rolled section continuous rolling relationship in theory, the stability of forming process does not also solve fully.

The axial rolling moulding of steel ball is a brand-new field, and forefathers have carried out number of research projects for this reason.But regrettably also have two hang-ups still unresolved so far: the one, the pass design is unreasonable, the metal loss at connecting band position is big, reduced stock utilization, and in the warp tool design, do not considered the rational flowing space of this part metal, to such an extent as to produce folding; The 2nd, deformation technique is owed rationally to be difficult to set up continuous rolling relationship.In the dynamic molding process, rolled piece very easily produces and reverses, and makes whole deformation process be in a kind of unsteady state.

Summary of the invention

The object of the present invention is to provide a kind of dividing tandem mill for steel ball blanks and steel ball axial rolling forming technology, solve above-mentioned two difficult problems, realize the axial rolling moulding of steel ball, and then improve the Forming Quality and the productivity ratio of steel ball from technology and equipment.

The object of the present invention is achieved like this: this dividing tandem mill for steel ball blanks is by motor 1, decelerator 2, transmission case 3, horizontal roller power transmission shaft 4, the universal drive shaft 5 of transmission edger roll, two roller horizontal mills 6, vertical miller 9, the base 10 of milling train is installed, 8 compositions of the synchronous guide and guard wheel of guide and guard pipe 7 and edger roll, it is characterized in that: described vertical miller (9) is positioned between two the two roller horizontal mills (6), the output of transmission case 3 has five spindle noses, wherein be positioned at both sides and be vertically arranged two pairs of spindle noses and be connected with horizontal roller power transmission shaft 4 respectively, and the rotating speed of these four output shafts equates; Spindle nose under middle the residence then is connected with the universal drive shaft 5 that drives vertical miller; The flange hole of plug 14 is an elliptical aperture, when horizontal roller need be adjusted phase place, can unclamp bolt 16, makes plug 14 produce a micro-corner with connecing axle 15, fastening bolt 16 again again after adjusting phase place; Guide and guard beam 18 is equipped with at the place, gateway of described two roller horizontal mills 6, composite (back-up) roll 19 is installed on the frame 20 by bearing block 23, frame 20 is connected by housiung separator 22, the screw-down 21 that is installed in frame 20 window center is used for adjusting roll pass, the collars 25 of composite (back-up) roll 19 is connected with roll shaft 24 by key 27 with periodic ring 26, and by nut 28 lockings, composite (back-up) roll 19 is a fabricated structure, its pass is by to the cutting of rolled piece implementation cycle, the middle part, footpath is the periodic ring 26 that waits radius and collars 25 compositions of band side, pass position gradient at the bottom of likeness in form sprocket wheel and the pass, its gradient is 1: 4.5-1: 6.0, the side gradient of periodic ring 26 is identical with collars 25, the vestibule that constitutes is the half of body of semi-enclosed flat ellipse, two roller horizontal mills 6 are installed on the base 10: the conical gear 34 on the roll mandrel 33 of described vertical miller 9 is driven by the conical gear on the power shaft 36 35, and axle 36 is connected with universal drive shaft 5, synchromesh gear 32 also is housed on axle 33, synchromesh gear 32 is a cylindric spiral gear, when the synchromesh gear 29 that is engaged with produces a small axial displacement with respect to 32, thereby also must produce the phase place adjustment that a micro-corner is realized the edger roll pass: the conical gear 39 of edger roll 38 coaxial tops is meshed with gear 40 on spools 41, axle 41 is supported by the support 42 that is fixed on the frame 37, cycle synchronisation guide and guard wheel 8 is connected with clamping plate (47) by bolt, clamping plate (47) are fixed on the axle (41) by key (46), cycle synchronisation guide and guard wheel 8 equates with the pass number of edger roll 38, rotating speed equates that also the fixing hole on clamping plate 47 is an elliptical aperture.

The moulding process of steel ball blanks is: with cycle cross sections such as raw material (round steel) transversally cutting one-tenth, its cross sectional shape is the flat oval shape, at cutting part connecting band is arranged, and makes rolled piece cut and be regardless of by the composite (back-up) roll pass in first road; The second road rolling on edge is finished the ball forming process by two hemisphere passes, and is stable in order to make the second road cutting deformation process, and a synchronous guide and guard wheel 8 is installed in the porch of vertical mill, its role is to induce rolled piece rolling synchronously; The 3rd road separates spheroid by roll pass at cutting part.

Description of drawings

Fig. 1 is the dividing tandem mill for steel ball blanks outline drawing;

Fig. 2 is that dividing tandem mill for steel ball blanks K is to structural representation;

Fig. 3 is a horizontal roller transmission shaft structure schematic diagram;

Fig. 4 is a horizontal roller power transmission shaft A-A cutaway view;

Fig. 5 is two roller horizontal mill outline drawings;

Fig. 6 is the composite (back-up) roll structural representation;

Fig. 7 is a composite (back-up) roll A-A cutaway view;

Fig. 8 is the transmission and the phase adjusted schematic diagram of vertical mill.

The specific embodiment

Fig. 1, Fig. 2 are disclosed to be one embodiment of the present of invention, the transmission system of steel ball bloom continuous rolling mill is made up of the universal drive shaft 5 of motor 1, decelerator 2, transmission case 3, horizontal roller power transmission shaft 4 and transmission edger roll, drives two two roller horizontal mills 6 and the vertical miller between the two 9 simultaneously.Two roller horizontal mills 6 can be done laterally fine setting on base 10, to adapt to different ball base specification pitches.The dividing tandem mill for steel ball blanks of being invented, because the forming process of ball base is finished by the roll forging of roll pass substep in axial rolling, rolled piece does not produce rotation in whole deformation process, and the defective that occurs in the time of therefore also just the oblique milling steel ball can not occurring has improved Forming Quality; Stock utilization can reach more than 94%, and when rolling diameter was the steel ball base of 16.2mm, productivity ratio was 1420 of per minutes, apparently higher than cold-heading and screw groove diagonal rolling technology.

Claims

1, a kind of dividing tandem mill for steel ball blanks, by motor (1), decelerator (2), transmission case (3), horizontal roller power transmission shaft (4), the universal drive shaft of transmission edger roll (5), two roller horizontal mills (6), vertical miller (9), base (10), the synchronous guide and guard wheels of guide and guard pipe (7) and edger roll (8) are formed, it is characterized in that: described vertical miller (9) is positioned between two the two roller horizontal mills (6), the output of transmission case (3) has five spindle noses, wherein being positioned at both sides is vertically arranged two pairs of spindle noses and is connected with horizontal roller power transmission shaft (4) respectively, and the rotating speed of these four output shafts equates that the spindle nose under middle the residence then is connected with the universal drive shaft (5) that drives vertical miller; The roll (19) of two roller horizontal mills (6) is a fabricated structure, its pass is made up of the periodic ring (26) of radiuses such as being to middle part, footpath at the bottom of the cutting of rolled piece implementation cycle, likeness in form sprocket wheel and the pass and the collars (25) of band side, pass position gradient, its gradient is 1: 4.5-1: 6.0, the side gradient of periodic ring (26) is identical with collars (25), and the vestibule of formation is the half of body of semi-enclosed flat ellipse; The conical gear (39) of the coaxial top of edger roll (38) is meshed with the gear (40) of axle on (41), axle (41) is supported by the support (42) that is fixed on the frame (37), cycle synchronisation guide and guard wheels (8) equate with the pass number of edger roll (38), rotating speed also equates, fixing hole on clamping plate (28) is an elliptical aperture, described cycle synchronisation guide and guard wheels (8) are connected with clamping plate (47) by bolt, and clamping plate (47) are fixed on the axle (41) by key (46).

2, dividing tandem mill for steel ball blanks according to claim 1, it is characterized in that: the flange hole of plug (14) is an elliptical aperture, when horizontal roller need be adjusted phase place, can unclamp bolt (16), make plug (14) produce a micro-corner, fastening bolt (16) again again after adjusting phase place with connecing axle (15).

3, dividing tandem mill for steel ball blanks according to claim 1 is characterized in that: the collars (25) of composite (back-up) roll (19) is connected with roll shaft (24) by key (27) with periodic ring (26), and is locked by nut (28).

4, dividing tandem mill for steel ball blanks according to claim 1, it is characterized in that: the conical gear (34) on the roll mandrel (33) of vertical miller (9) is driven by the conical gear (35) on the power shaft (36), and axle (36) is connected with universal drive shaft (5), synchromesh gear (32) also is housed on axle (33), synchromesh gear (32) is a cylindric spiral gear, when the synchromesh gear that is engaged with (29) produces a small axial displacement with respect to synchromesh gear (32), also must produce the phase place adjustment that a micro-corner is realized the edger roll pass.

5, a kind of moulding process that uses the described dividing tandem mill for steel ball blanks of claim 1 to produce steel ball blanks, it is characterized in that: first road, by the composite (back-up) roll pass with cycle cross sections such as raw material (round steel) transversally cutting one-tenth, its cross sectional shape is the flat oval shape, at cutting part connecting band is arranged, make rolled piece cut and be regardless of; Second road, rolling on edge is finished the spheroid forming process by two hemisphere passes, and is stable in order to make the second road deformation process, in the porch of vertical mill synchronous guide and guard wheels (8) is installed, and its role is to induce rolled piece rolling synchronously; The 3rd road separates spheroid by roll pass at cutting part; The roll rotational speed of 3 rolling mills is identical.