CN1389323A

CN1389323A - Combined straight-gear rolling and extruding finish formation equipment and technological process

Info

Publication number: CN1389323A
Application number: CN 01114033
Authority: CN
Inventors: 宋玉泉
Original assignee: Individual
Current assignee: Individual
Priority date: 2001-06-04
Filing date: 2001-06-04
Publication date: 2003-01-08
Anticipated expiration: 2021-06-04
Also published as: CN1207124C

Abstract

The present invention relates to a rolling and extruding combined fine-forming equipment for straight gear and its process. Said equipment is formed from die arrangement mounted on the plate type rolling plastic fine-forming machine and straight gear heat-extruding fine-forming device mounted on the hydrautic machine. Its process includes the following steps: firstly, placing round rod material into die cavity of rolling plastic fine-forming machine and rolling to obtain straight gear blank, then extruding said blank material in extruding fine forming device. The combination of rolling blank-making process and extruding forming process can raise material utilization rate, raise production efficiency and has no noise, etc.

Description

Spur gear rolling and smart device and the technology that is shaped of extruding combination

The invention belongs to the Metal Forming technical field, relate to the device of a kind of metal rolling and extrusion molding and the improvement of technology.

Gear shaping, gear-shaping, mill teeth, gear hobbing in the process technology of existing spur gear, cold, warm extrusion pressure etc., all come with some shortcomings, gear shaping, gear-shaping, mill teeth not only stock utilization are low, and the metallic fiber of blank cut off, its bad mechanical property, the efficient of gear hobbing processing is low, and the difficulty of the comparatively hard crisp material of processing is very big; Cold, warm extrusion pressure not only needs very large-tonnage forcing press, and mold materials hardness and wearability is all had very high requirement.

This just need can reduce equipment tonnage, raising stock utilization and working modulus according to the deformation rule development that metallized thermoplastic is shaped is a kind of, mechanical roughing be can substitute again and the device and the technology of the spur gear plastic precision forming of mechanical performance guaranteed, this technology combines with gear shaping, gear-shaping and the mill teeth of machining again, is a new developing direction that adds work gear in the Modern Manufacturing Technology.

A kind of spur gear rolling that the present invention provides for achieving the above object and smart device and the technology that is shaped of extruding combination.

Apparatus of the present invention are as follows:

This device has hot roll extrusion base of spur gear and the smart device of installing on board-like roll extrusion plastic precision forming machine (seeing the patent No.: ZL 95109500.5) and the hydraulic press that is shaped of hot extrusion.

The hot rolling base of spur gear is finished on board-like roll extrusion plastic precision forming machine.

The upper and lower template of rolling is identical antisymmetry type groove, and upper and lower template is contained in respectively on the upper and lower sliding clamp, and upper and lower sliding clamp contacts with upper and lower pressure roller is tangent respectively, and upper and lower template is slided relatively with upper and lower pressing plate.

Spur gear hot extrusion precision forming device is made up of last device and lower device:

In last device, fairlead and pressing plate are fixed on the upper mounted plate, lead and spring guide pillar are fixed on the bottom plate, last punch and core bar guide pin bushing are by the below of the bottom plate bottom plate of packing into, last convex die rod is to be contained in punch and the core bar guide pin bushing, between epirelief core rod and last punch and core bar guide pin bushing, be provided with the air spring chamber, in the air spring chamber, be provided with intake valve and air bleeding valve, and intake valve communicates with high-pressure air source, when the pressure of air spring chamber is lower than the maximum pressure that sets, high-pressure air source is just by the intake valve air feed, when the pressure of air spring chamber is higher than the minimum pressure that sets, just by the air bleeding valve exhaust, gland is tightened on punch and the core bar guide pin bushing with bolt, the upper mounted plate that fairlead is housed can be inserted on the bottom plate that lead is housed, and upper mounted plate is contained in the below of moved cross beam, and bottom plate is fixed on the frame.

In lower device, the lower punch guide pin bushing is equipped with in the below of workbench, lower punch and core bar guide pin bushing are housed on the bottom plate, bottom plate is fixed on the frame, on lower punch and core bar guide pin bushing, spring is housed, the following of bottom plate can insert core bar lower punch and core bar guide pin bushing, and its upper surface with following liftout tank plunger is connected.

Technology of the present invention is as follows:

The round bar that is heated to forging temperature is delivered to the porch of the bolster of board-like roll extrusion plastic precision forming bolster, and the center line of the center line of assurance round bar and last lower compression roller is in same vertical plane, in the moving relative sliding process of bolster plate of upper and lower slip pressure zone, the cylinder bar just is rolled into the wheel blank of smart shaping spur gear extruding usefulness, and wheel blank falls into conveyer belt by the exit of bolster.

Spur gear hot extrusion precision forming device is earlier die being pressed in the cover after the heating of mould prestressing force cover again; be contained in it on workbench then and make punch and the core bar guide pin bushing; lower punch and core bar guide pin bushing and die are slidingly matched; just can be fixed tightly on the workbench then; the straight-tooth wheel blank that is heated to forging temperature is inserted die; start press; last punch and core bar guide pin bushing are pressed into die; just the blank mid portion is produced the jumping-up distortion; when pressure increases to regulation numerical value; the elastic resistance that the epirelief core rod has just overcome the air spring chamber moves down; be pressed into the wheel blank center; the profile of tooth of blank is filled in the mould type groove of die fully; meanwhile; lower punch is because of being subjected to the restriction of bottom plate; can not move down and the lower punch core bar just is pressed into the center of wheel blank under the effect of liftout tank below gear blank; the profile of tooth of wheel blank is filled in the type groove of die fully; subsequently when the moved cross beam of press moves up; liftout tank just ejects the smart gear that is shaped of hot extrusion, has finished smart shaping of hot extrusion of spur gear.

Advantage of the present invention is:

1, the equipment tonnage of the group technology of rolling base and extrusion molding needs is little, stock utilization is high, and can give full play to the potential ability of material plasticity.

2, blank is good to the filling of mould, and the cutting output that has significantly reduced machining has improved stock utilization, metallic fiber distributes rationally, the mechanical performance height.

3, the production efficiency height easily is automated.

4, no impact, noise and other environmental hazard.

5, equipment investment is low, and is low to workman's specification requirement.

Fig. 1 .1 is the front view of the board-like roll extrusion plastic precision forming of the present invention machine;

Fig. 1 .2 is the side view of the board-like roll extrusion plastic precision forming of the present invention machine;

Fig. 2 .1 and 2.2 is frock and die structure dwgs of the rolling of the board-like roll extrusion plastic precision forming of the present invention machine;

Fig. 2 .3 is the frock and the mould structure A-A cutaway view of the rolling of the board-like roll extrusion plastic precision forming of the present invention machine;

Fig. 2 .4 is the frock of rolling of the board-like roll extrusion plastic precision forming of the present invention machine and the B-B cutaway view of mould structure A-A cutaway view;

Fig. 2 .5 is the rolling die stencil-type groove figure of the board-like roll extrusion plastic precision forming of the present invention machine;

Fig. 3 is the structure chart of spur gear hot extrusion hydraulic press of the present invention and extruding precision forming device;

Fig. 4 .1 is the precise geometry and the dimensional drawing of spur gear of the present invention;

Fig. 4 .2 is spur gear geometry and a dimensional drawing after the precise geometry of spur gear of the present invention and size and the hot rolling;

Fig. 4 .3 is geometry and the dimensional drawing that the present invention considers the smart shaping spur gear of hot extrusion of allowance;

Fig. 5 .1 is the spur gear blank structure figure that board-like roll extrusion plastic precision forming machine of the present invention is made through the first road rolling;

Fig. 5 .2 is the spur gear blank structure figure that board-like roll extrusion plastic precision forming machine of the present invention is made through the second road rolling;

Below in conjunction with accompanying drawing the present invention is described further:

Wherein: the 1st, last sliding clamp, the 2nd, cope match-plate pattern, the 3rd, last pressure roller, the 4th, template die cavity, the 5th, lower bolster, the 6th, lower slider pressing plate, the 7th, lower compression roller; The 8th, the hydraulic press basis, the 9th, liftout tank, the 10th, frame, the 11st, workbench, the 12nd, moved cross beam, the 13rd, last fixed cross beam, the 14th, the work master cylinder, the 15th, balance side cylinder, the 16th, last device upper mounted plate, the 17th, fairlead, the 18th, lead, the 19th, last device pressing plate, the 20th, gland, the 21st, spring guide pillar, the 22nd, the epirelief core rod, the 23rd, the air spring chamber, the 24th, last device bottom plate, the 25th, last punch and core bar guide pin bushing, the 26th, Extruding die, the 27th, Extruding die prestressing force overcoat, the 28th, the straight-tooth wheel blank, the 29th, lower punch and core bar guide pin bushing, the 30th, the lower punch core bar, the 31st, the lower punch guide pin bushing, the 32nd, the lower device fixed head, the 33rd, spring, the 34th, the liftout tank plunger.Upper and lower template is contained in respectively on the upper and lower sliding clamp, upper and lower sliding clamp contacts with upper and lower pressure roller is tangent respectively, to increase the rigidity of upper and lower pressing plate, in the rolling process, upper and lower template is slided relatively with upper and lower pressing plate, so place the blank of die cavity just to be rolled shaping.

In the rolling process, according to the constancy of volume law, with due regard to oxidation losing quantity, cut-out consumption according to the volume of spur gear blank and the spur gear number of a calibration diameter of a circle and a rolling, are selected the diameter and the length of round bar.

In the smart technical process that is shaped of spur gear hot extrusion, when squeeze pressure increases to certain numerical value, the elastic resistance that the epirelief core rod has just overcome the air spring chamber moves down and (is provided with pressure sensor, intake valve and air bleeding valve in air chamber, in the course of the work, because the rising of temperature, when indoor maximum pressure may surpass the maximum pressure of setting, air bleeding valve is just opened automatically, and intake valve is just opened automatically when making indoor minimum pressure be lower than the minimum pressure of setting owing to degradation reason under the indoor temperature.

The air spring chamber can replace two hydrodynamic machines.

Embodiment 1:

The round bar determining dimensions: with three spur gears is one group, and considers 6 millimeters at 0.5 millimeter and two otch of allowance, in conjunction with Fig. 4 .1 and appended parameter thereof, wherein according to following formula:

V = 2 Z l_{0} [\frac{r_{a}^{2} \sin 2 θ_{1}}{4} - {&Integral;}_{r_{b}}^{r_{a} \cos θ} yax - \frac{r_{f}^{} θ_{1}}{2} + \frac{(r_{a}^{2} - r_{f}^{2}) θ_{2}}{4}] + π r_{f}^{2} l_{0}

θ_{1} = 2 invα + inv \frac{r_{b}}{r_{a}}

θ_{2} = \frac{s}{r} - 2 [inv (\frac{r_{b}}{r_{a}}) - invα]

Can try to achieve required cumulative volume is 635 cubic centimetres.So can select 126 millimeters of length for use, diameter is 40 millimeters a round bar.

Rolling base: utilize the template (as Fig. 2) that is contained on the plate pressing rolling plastic finish forming machine (as Fig. 1) through the first road rolling, make bar roll into the shape of Fig. 5 .1, again through the second road rolling, make its shape that becomes Fig. 5 .2, again through the 3rd road rolling, and through the 4th road finishing shape, just roll into the shape of Fig. 4 .2 heavy line, wherein fine line is the accurate shape of spur gear, and the heavy line shape that is rolled into, the facewidth beyond base radius Rb is littler than the width of accurate spur gear.

Extruding is smart to be shaped: the die that the workpiece through rolling base such as Fig. 4 .2 is placed Fig. 3, starting press depresses, under the subtend effect of last punch and guide pin bushing core bar and lower punch and core bar guide pin bushing, the blank mid portion by jumping-up the time teeth of mid portion also be subjected to jumping-up, and the tooth root part is because extruding is subjected to stretcher strain, when the pressure of press continues to increase, the epirelief core rod is pressed into the center of blank upper end, the lower punch core bar is pushed down into the center of blank lower end in the pressure effect of liftout tank, so being expanded simultaneously, blank upper end and bottom squeeze, stretcher strain also takes place at its root, lift the press moved cross beam at last, workpiece is ejected, and has finished the smart spur gear that is shaped of hot extrusion shown in Fig. 4 .3 fine line.Fig. 4 .1

The number of teeth: z=20

Modulus: m=4

Pressure angle on the reference circle: α=20 °

Addendum coefficient:

h_{a}^{*} = 1

Tip clearance coefficient: c ^*=0.25

Reference diameter: d=mz=80

Height of teeth top:

h_{a} = h_{a}^{*} \cdot m = 4

Height of teeth root:

h_{f} = (h_{a}^{*} + c^{*}) \cdot m = 5

Whole depth: h=h _a+ h _f=9

Tip diameter: d _a=d+2h _a=88

Root diameter: d _f=d-2h _f=70

Base circle diameter (BCD): d _b=dcos (α)=75.2

Gear thickness: l ₀=40 Fig. 2 .4 are wherein:

K_{1} = π \cdot (\frac{d_{1}}{2} - h_{0})

K_{5} = π \cdot (\frac{d_{1}}{2} - h_{0} - h_{1} - h_{2} - h_{3} - h_{4})

K_{2} = π \cdot (\frac{d_{1}}{2} - h_{0} - h_{1})

k ₁k ₂k ₃k ₄k ₅: be the overlapping portion in the rolling process

K

_{3} = π \cdot (\frac{d_{1}}{2} - h_{0} - h_{1} - h_{2})

h ₀h ₁h ₂h ₃h ₄: be the radially drafts in the rolling process

K

_{4} = π \cdot (\frac{d_{1}}{2} - h_{0} - h_{1} - h_{2} - h_{3})

Claims

1, a kind of spur gear rolling and smart device and the technology that is shaped of extruding combination are made up of board-like roll extrusion plastic precision forming machine and hydraulic press, it is characterized in that:

In last device, fairlead and pressing plate are fixed on the fixed head, lead and spring guide pillar are fixed on the bottom plate, last punch and core bar guide pin bushing are by the below of the bottom plate bottom plate of packing into, last convex die rod is to be contained in punch and the core bar guide pin bushing, between epirelief core rod and last punch and core bar guide pin bushing, be provided with the air spring chamber, in the air spring chamber, be provided with intake valve and air bleeding valve, and intake valve communicates with high-pressure air source, when the pressure of air spring chamber is lower than the maximum pressure that sets, high-pressure air source is just by the intake valve air feed, when the pressure of air spring chamber is higher than the minimum pressure that sets, just by the air bleeding valve exhaust, gland is tightened on punch and the core bar guide pin bushing with bolt, the upper mounted plate that fairlead is housed can be inserted on the bottom plate that lead is housed, and upper mounted plate is contained in the below of moved cross beam, and bottom plate is fixed on the frame.

2, a kind of spur gear rolling and smart device and the technology that is shaped of extruding combination, its technology is:

A, the round bar that will be heated to forging temperature are delivered to the porch of board-like roll extrusion plastic precision forming bolster, and the center line of the center line of assurance round bar and last lower compression roller is in same vertical plane, in the relative sliding process of upper and lower sliding clamp, the cylinder bar just is rolled into the fine finishining wheel blank of smart shaping spur gear extruding usefulness, and wheel blank falls into conveyer belt by the exit of bolster;

B; on the smart forming machine of spur gear hot extrusion; again die being pressed in the cover after the heating of mould prestressing force cover; be contained in it on workbench then and make punch and the core bar guide pin bushing; lower punch and core bar guide pin bushing and die are slidingly matched; just can be fixed tightly on the workbench then; the straight-tooth wheel blank that is heated to forging temperature is inserted die; start press; last punch and core bar guide pin bushing are pressed into die; just blank is produced the jumping-up distortion; when pressure increases to regulation numerical value; the elastic resistance that the epirelief core rod has just overcome the air spring chamber moves down; be pressed into the wheel blank center; the profile of tooth of blank is filled in the mould type groove of die fully; meanwhile; lower punch is because of being subjected to the restriction of bottom plate; can not move down and the lower punch core bar just is pressed into the center of wheel blank under the effect of liftout tank below gear blank; the profile of tooth of wheel blank is filled in the type groove of die fully; when the moved cross beam of press moves up; liftout tank just ejects the smart gear that is shaped of hot extrusion, has finished smart shaping of hot extrusion of spur gear.

3, a kind of spur gear rolling according to claim 1 and smart device and the technology that is shaped of extruding combination, it is characterized in that: the upper and lower template of rolling is identical antisymmetry type groove, upper and lower template is contained in respectively on the upper and lower sliding clamp, upper and lower sliding clamp contacts with upper and lower pressure roller is tangent respectively, and upper and lower template is slided relatively with upper and lower pressing plate.

4, a kind of spur gear rolling according to claim 1 and smart device and the technology that is shaped of extruding combination, it is characterized in that: the air spring chamber can replace two hydrodynamic machines.