CN102211145A - Gravity casting process of all-metal mould of coupler aluminum part - Google Patents

Abstract

The invention relates to a gravity casting machining process of an all-metal mould of a hydraulic coupler shell, comprising the following process steps of: (1) mould preheating: placing the cleaned steel mould into a baking oven for warming and preheating, then spraying demoulding paint to the contact surface of a workpiece, heating again to 200-250 DEG C, keeping temperature, and then fixing a lower mould on a demoulding machine; (2) pouring: assembling a mould assembled in a positioning way through an upper mould and the lower mould of the demoulding machine, and then fast pouring previously refined liquid aluminum alloy into a cavity; and (3) demolding: firstly enabling the upper mould to be pass through a transmission device, enabling the upper mould to be firstly separated from the workpiece through an upper mould demoulding ejector plate and an upper mould fixing plate, and then ejecting the workpiece through a demoulding ejector plate and a discharging ejector plate. According to the gravity casting machining process disclosed by the invention, the manufacturing time of a sand core is saved and the cost of sand purchasing and waste sand cleaning is reduced by utilizing a sand casting process of the all-metal mould; in addition, the effect of a low-pressure casting process can be achieved by utilizing the all-metal mould.

Description

Coupling device aluminum component all-metal mould gravity foundry technology

Affiliated technical field

The invention belongs to machine casting technology, be specifically related to fluid-flywheel clutch aluminum component all-metal mould gravity foundry technology.

Background technology

In the prior art, aluminum component housing band blade internal molds such as the turbine of coupling device, pump impeller mainly adopt common core, external mold to adopt the die cast method, its weak point, and the one, internal mold adopts the core casting, to the modeling requirement height of sand, to moulder's specification requirement height; Defectives such as the 2nd, core is fragile, reaches cast fast by the core location, and it is asymmetric that the center appears in product that casting is come out easily, and blade is inhomogeneous, and blade surface and inner chamber are rough, big to fluid-flywheel clutch oil stream circulation resistance in use, loss power; The 3rd, the product surface fineness of core casting is not high, and yield rate is low, and the required site area that takies of moulding is big, and it is discarded mostly that sand has been cast the back, and neither environmental protection is uneconomical again.

Some producer adopts low-pressure casting process now, and low pressure casting is by advanced equipment input, press and mould input cost height, and the description of fluid-flywheel clutch is various, and every kind of product is all made mould according to the requirement of low pressure casting, and enterprise is difficult to bear.

Summary of the invention

The present invention aims to provide a kind of fluid-flywheel clutch aluminum component all-metal mould gravity foundry technology that overcomes above-mentioned prior art weak point, make the band blade shell casting of coupling device remove core mold, adopting inner core fully is the all-metal mould, Design Orientation device on inner core all-metal mould, improve the core mold location defect, rely on the positioner on the all-metal mould inner core, earlier all-metal mould inner core is fixed on the counterdie and is integrated, rely on the positioner matched moulds of upper and lower mould again, guarantee its die cavity rule evenly with the all-metal mould, the flowing water passage is between 7～13mm; Simultaneously, because of the blade on the fluid-flywheel clutch is many and irregular, demoulding difficulty is bigger, and for improving the yield rate of product, special specifications and models according to coupling device are provided with a multi-functional mechanical type ingot stripper.

The technical scheme of invention is: coupling device aluminum component all-metal mould gravity foundry technology may further comprise the steps:

(1) mould and die preheating matched moulds: all-metal mould inner core is fixed on the counterdie is integrated; punching block after the cleaning is put into oven; heat and open oven after being preheated to 100～150 ℃ and take out mould; again to die workpiece contact-making surface spraying mould wash; be warmed to again between 200～250 ℃; the counterdie that inner mould core is fixed takes out, and is fixed on above the support bar of model fixing seat under the ingot stripper, with pressing plate and counterdie set bolt counterdie is locked.Then outer push rod, interior push rod are installed in the counterdie the inside, patrix being closed again, with upper mould fixed plate and patrix standing screw patrix is fixed, is benchmark with the upper mould fixed plate lower plane, 4 bolts of adjusting the top are adjusted on the same horizontal plane, guarantee stressed even.

(2) cast: will locate the mould of assembling, and by ingot stripper upper die and lower die be carried out matched moulds, then that prior refining is good liquid aluminium alloy pours in the die cavity fast by the cast gate on mould both sides, after the natural cooled and solidified, removes the impurity of emerging from cast gate.

(3) demoulding: open the rotation of driven by motor driving gear pair and drive lead screw, driving demoulding top board, last moulding/demoulding push rod, discharging push rod, discharging top board, adjustment top and upper mounted plate moves up simultaneously, the patrix that is fixed on the upper mounted plate rises together, finishes patrix and separates with counterdie with workpiece; Outer push rod and interior push rod are given in discharging top board power transmission simultaneously, make that workpiece is stressed separately to be separated with internal mold, counterdie.

Advantage of the present invention: what the internal mold of prior art was used is core, and what internal mold was used among the present invention is the all-metal mould.The present invention utilizes all-metal mould founding casting technique, has saved the time of doing core, has reduced the cost of buying sand and cleaning antiquated sand; Utilize the all-metal mould not by the input of air injection machine simultaneously, can reach the effect of low-pressure casting process equally.

Description of drawings

Fig. 1 is matched moulds, demoulding figure, and Fig. 2 is prior art cast figure, and Fig. 3 pours into a mould figure for the present invention.

Among the figure: the 1-upper mounted plate, the 2-pressing plate, the 3-support bar, 4-counterdie set bolt, 5-discharging top board, model fixing seat under the 6-, the 7-upper fixed seat, 8-discharging push rod, 9-patrix callosity mould push rod, the 10-transmission nut, 11-demoulding top board, the 12-drive lead screw,

The 13-driving gear pair, the 14-bottom plate, 15-adjusts the top, 16-patrix standing screw, 17-counterdie, the outer push rod of 18-, push rod in the 19-internal mold, 20-, 21-patrix, 22-cast gate, 23-gas outlet, 24 cores, 25-all-metal film.

The specific embodiment

Below in conjunction with drawings and Examples invention is described further:

Embodiment: the turbine with YOXII400 is that example describes all-metal mould gravity foundry technology.As shown in the figure:

(1) mould and die preheating matched moulds.At first with the spot and the residue on the mold cleaning surface of YOX400 fluid-flywheel clutch turbine, all-metal mould inner core is fixed on the counterdie is integrated, interior push rod on the mold removal and outer push rod, mould and relevant assembly are put into oven, make the temperature of oven rise to 100～150 ℃, constant temperature kept 30～60 minutes, made mold temperature rise to 250 ℃ equably again.Take out mould at mold cavity surface and assembly spraying mould wash, put into stove constant temperature once more about 10 minutes, the interior external diameter of the inside and outside collar of attention mould is reserved the expansion gap of 0.5mm.Then the counterdie 17 that takes out is fixed on the following model fixing seat 6 of ingot stripper, patrix 21 is fixed on the upper mould fixed plate 1, carry out the matched moulds of upper and lower mould, the gap that requires to guarantee flowing water in the die cavity reaches 7mm.After finishing, take matched moulds the 0.2mm clearance gauge that the interface of upper and lower mould is checked whether the gap of mould adheres to specification, and the gap that is lower than 0.2mm belongs to normal range (NR).The set bolt 16 of counterdie set bolt 4 and patrix closed up tighten, finish the location of mould up and down at this point.As power source, transmit mechanical energy in driving gear pair 13 by motor, drive drive lead screw 12 rotations, the transmission nut 10 band demoulding top boards 11 that are fixed on the demoulding top board 11 are moved up and down through slowing down.Thereby realize the purpose of the demoulding.Utilize ingot stripper with patrix 21 jack-up, outer push rod 18 of installation mold and interior push rod 20 put down patrix 21 matched moulds once more, use the same method and check that the gap of mould makes it to meet the requirements up and down.For making it, N Reference Alignment adjustment top 15 keeps stressed even with the upper mould fixed plate.

(2) cast.After upper and lower mould fixed, required auxiliary clamp was placed in corresponding position during cast, carried out the preceding preparation of cast.The matched moulds time generally can not surpass 10 minutes, and the temperature of mould can not be lower than under 200 ℃, in order to avoid influence the flowability of alloy liquation.Alloy melt temperature after the refining reaches 680～760 ℃ pouring temperature, ladle out that 12 kilograms of alloy liquations are quick, steady, continual to pour in the mold cavity by the both sides cup, steam vent by mould gate 22 and mold periphery is discharged the gas that produces in the die cavity, and cooling is 6 minutes naturally; Check whether the liquation in the cup solidifies fully, start ingot stripper after confirming to solidify.

(3) demoulding.At first open driven by motor driving gear pair 13 and drive lead screw 12 rotations, give transmission nut 10 by drive lead screw 12 transferring power, because transmission nut 10 is fixed on the demoulding top board 11, drive demoulding top board 11, last moulding/demoulding push rod 9, discharging push rod 8 and discharging top board 5 move up simultaneously, and (this moment, discharging top board 5 and outer push rod 18,20 of interior push rods left the space, discharging top board 5 does not stress), drive to adjust on top 15 and the upper mounted plate 1 and move, patrix 21 is fixed on the upper mounted plate 1 and forms integral body and rise together, finishes patrix 21 and separates with counterdie 17 with workpiece; Outer push rod 18 and interior push rod 20 are given in discharging top board 5 power transmissions simultaneously, make that workpiece is stressed separately to be separated with internal mold 19, counterdie 17, finish the releasing process of workpiece.

Claims (1)

1. fluid-flywheel clutch housing all-metal mould gravitational casting processing technology is characterized in that adopting following processing step:

(1) mould and die preheating matched moulds: all-metal mould inner core is fixed on the counterdie is integrated; punching block after the cleaning is put into oven; heat and open oven after being preheated to 100～150 ℃ and take out mould; again to die workpiece contact-making surface spraying mould wash; be warmed to again between 200～250 ℃; the counterdie that inner mould core is fixed takes out, and is fixed on above the support bar of model fixing seat under the ingot stripper, with pressing plate and counterdie set bolt counterdie is locked.Then outer push rod, interior push rod are installed in the counterdie the inside, patrix being closed again, with upper mould fixed plate and patrix standing screw patrix is fixed, is benchmark with the upper mould fixed plate lower plane, 4 bolts of adjusting the top are adjusted on the same horizontal plane, guarantee stressed even.

(2) cast: will locate the mould of assembling, and by ingot stripper upper die and lower die be carried out matched moulds, then that prior refining is good liquid aluminium alloy pours in the die cavity fast by the cast gate on mould both sides, after the natural cooled and solidified, removes the impurity of emerging from cast gate.

(3) demoulding: open the rotation of driven by motor driving gear pair and drive lead screw, driving demoulding top board, last moulding/demoulding push rod, discharging push rod, discharging top board, adjustment top and upper mounted plate moves up simultaneously, the patrix that is fixed on the upper mounted plate rises together, finishes patrix and separates with counterdie with workpiece; Outer push rod and interior push rod are given in discharging top board power transmission simultaneously, make that workpiece is stressed separately to be separated with internal mold, counterdie.

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