CN108176835A - Reduce the processing technology that die casting for shell part generates stomata - Google Patents
Reduce the processing technology that die casting for shell part generates stomata Download PDFInfo
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- CN108176835A CN108176835A CN201810069089.5A CN201810069089A CN108176835A CN 108176835 A CN108176835 A CN 108176835A CN 201810069089 A CN201810069089 A CN 201810069089A CN 108176835 A CN108176835 A CN 108176835A
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- pressure chamber
- piston cylinder
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- die casting
- dilatation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
- B22D17/14—Machines with evacuated die cavity
Abstract
The present invention relates to compression casting fields, disclose a kind of processing technology for reducing die casting for shell part and generating stomata, include the following steps：(1) using the pressure chamber of straight-tube shape, one end of pressure chamber is connected with the cavity of mold, and the other end of pressure chamber opens up the feed inlet entered for molten metal, and punch is set in pressure chamber, push rod is coaxially disposed on punch, push rod makees straight reciprocating motion；(2) pressure chamber is divided into dilatation section and pumping section towards the direction of mold by feed inlet along pressure chamber, dilatation section is located at the low-speed stage of press casting procedure, and pumping section is located at the high speed stage of press casting procedure；(3) setting can make the dilatation mechanism that pressure chamber volume changes from small to big in dilatation section, be evacuated and set what can be vacuumized to vacuumize air extractor in section；(4) direction that push rod drives punch from dilatation section to pumping section moves, and molten metal is pressed into cavity.The invention is intended to provide a kind of technique for reducing die casting for shell part and the probability of stomata being generated in press casting procedure.
Description
Technical field
The present invention relates to compression casting fields.
Background technology
Die-casting technique is widely used in auto parts and components manufacture field, has short molding cycle, and production efficiency is high, environment friend
The advantages that good.But due to the different phase of the low speed of punch and high-speed motion in press casting procedure, in die cast die casting
In the process, it be easy to cause molten metal to move in pressure chamber and cavity in turbulent manner, easily causes volume gas phenomenon, so as to cause
Stomata, and the solubility of gas in the alloy are generated in final casting die casting, increases with the raising of temperature, is dissolved in alloy
In gas be difficult to be precipitated in press casting procedure, stomata can be also formed in die casting.
To avoid generating stomata in press casting procedure, the measure that can be taken at this stage is to utilize vacuum technique by the gas in cavity
Body is extracted out, and molten metal is made to fill cavity under vacuum conditions.And high vacuum die casting technology is a kind of advanced extraordinary die-casting process,
The vacuum pressure in mold cavity can be made to be maintained at below 5kPa.To obtain the condition of high vacuum degree in cavity, need to mold and pressure
Between room, good sealing is carried out between pressure chamber and punch, die casting for shell part is usually under 610 DEG C~680 DEG C of hot environment
Die casting is carried out, rear mold and die casting are completed in die casting needs to be cooled to 300 DEG C hereinafter, difference variation is big, it is difficult to ensure good
Leakproofness, thus also just it is difficult to ensure that condition of high vacuum degree, and then can not effectively solve die casting for shell part and generate gas in process of production
The problem of hole.
Invention content
The invention is intended to provide a kind of processing technology for reducing die casting for shell part and generating stomata, existed with reducing die casting for shell part
The probability of stomata is generated in press casting procedure.
The processing technology for reducing die casting for shell part and generating stomata in this programme, includes the following steps：
(1) using the pressure chamber of straight-tube shape, one end of pressure chamber is connected with the cavity of mold, and the other end of pressure chamber is opened up for metal
The feed inlet that liquid enters sets punch in pressure chamber, push rod is coaxially disposed on punch, push rod makees straight reciprocating motion；
(2) pressure chamber is divided into dilatation section and pumping section towards the direction of mold by feed inlet along pressure chamber, dilatation section is located at pressure
The low-speed stage of casting process, pumping section are located at the high speed stage of press casting procedure；
(3) setting can make the dilatation mechanism that pressure chamber volume changes from small to big in dilatation section, and being evacuated setting in section can carry out taking out very
Empty vacuumizes air extractor；
(4) direction that push rod drives punch from dilatation section to pumping section moves, and molten metal is pressed into cavity.
It the technical principle of this programme and has the beneficial effect that：Push rod drives punch to be moved from dilatation section to pumping section.Punch exists
Dilatation section is in low-speed stage and low-speed motion, and dilatation mechanism constantly expands the volume of dilatation section in this process, may be such that
A degree of vacuum degree is formed in pressure chamber, is precipitated from molten metal under the action of vacuum conducive to the gas in molten metal, is analysed
The gas gone out can be in metal also interior formation bubble and together with building up under the effect of buoyancy and the pushing of punch, and punch simultaneously
Low-speed motion set aside some time for the precipitation of gas in molten metal.When punch moves to high speed stage and high-speed motion, molten metal
When flowing through pumping section, air extractor starts, while dilatation mechanism stops, and air extractor extracts the bubble in molten metal out, into
And the indoor bubble of pressure is got rid of, the molten metal press-in mold cavity forming in pressure chamber is die casting for shell part by punch.
Using this programme, the indoor gas of pressure can be not only removed, the portion gas dissolved in molten metal can also be removed,
And then it realizes and reduces the probability that die casting for shell part generates stomata in press casting procedure.
Further, the parallel connection mandril parallel with push rod on the push rod.Convenient for being synchronized with the movement using mandril with push rod
Dilatation mechanism and air extractor are respectively driven in the process.
Further, the dilatation mechanism includes sliding block, and sliding block can be slided along the radial direction of pressure chamber, and the thickness of sliding block is big
In the wall thickness of pressure chamber, the sealing of the side walls of sliding block and pressure chamber, sliding block is towards being connected with the first rack, mandril on the side of mandril
Free end on be connected with the second rack, driving gear and driven gear are rotatably connected on the lateral wall of the pressure chamber, actively
Gear is coaxially connected with driven gear, and driving gear is engaged with the second rack, and driven gear is engaged with the first rack.Push rod is low
During fast stage low-speed motion, the second rack drives driving gear rotation on mandril, driving gear drives driven gear rotation, from
Moving teeth wheel drive the first rack drives sliding block is slided along the Inside To Outside of pressure chamber, so as to expand the volume of pressure chamber.Tune can be passed through
It saves the gearratio between driving gear and driven gear or adjusts the length of the second rack so that the second rack and driving tooth
When wheel is disengaged from, sliding block is concordant with the madial wall of pressure chamber towards the one side on the inside of pressure chamber.
Further, the air extractor includes piston cylinder, the closing of piston cylinder one end open one end, and piston cylinder is fixed on pressure chamber
On, the openend of piston cylinder slidably connects piston towards mold in piston cylinder, is connected on piston and piston is allowed to keep and piston
The compression spring that cylinder seal offsets, side of the piston far from compression spring are equipped with bearing rod, and bearing rod runs through the blind end of piston cylinder simultaneously
It is slidably connected on piston cylinder, bearing rod connects towards the free end of mandril and parallel with mandril, blind end and the pressure chamber of piston cylinder
It is logical.Mandril offsets more than dilatation Duan Houyu bearing rods, and bearing rod is pushed to drive piston cylinder compression press spring, vacuum is generated in piston cylinder
Indoor bubble will be pressed to be drawn into piston cylinder, indoor gas is pressed in removal.
Further, the piston cylinder is equipped with only supplied gas from the check valve discharged outside piston cylinder in piston cylinder.It is convenient for
Discharge the gas in piston cylinder.
Further, step (5) is further included：Cavity is vacuumized.Generation volume gas in cavity is avoided to show after cavity is vacuumized
As being further reduced the probability that die casting for shell part generates stomata in press casting procedure.
Description of the drawings
Fig. 1 is that the embodiment of the present invention reduces the structure diagram that die casting for shell part generates the processing technology of stomata.
Specific embodiment
Below by specific embodiment, the present invention is described in further detail：
Reference numeral in Figure of description includes：Pressure chamber 1, mold 2, feed inlet 3, push rod 4, mandril 5, sliding block 6, first
Rack 7, the second rack 8, punch 9, driving gear 10, driven gear 11, bearing rod 12, piston 13, piston cylinder 14, check valve
15。
Reduce the embodiment of the processing technology of die casting for shell part generation stomata substantially as shown in Figure 1：Include the following steps：
(1) using the pressure chamber of straight-tube shape 1, one end of pressure chamber 1 is connected with the cavity of mold 2, and the other end of pressure chamber 1 opens up confession
The feed inlet 3 that molten metal enters sets punch 9 in pressure chamber 1, push rod 4 is coaxially disposed on punch 9, and push rod 4 makees straight reciprocating motion,
The parallel connection mandril 5 parallel with push rod 4 on push rod 4；
(2) pressure chamber 1 is divided for dilatation section and pumping section, dilatation section towards the direction of mold 2 by feed inlet 3 along pressure chamber 1
In the low-speed stage of press casting procedure, pumping section is located at the high speed stage of press casting procedure；
(3) setting can make the dilatation mechanism that 1 volume of pressure chamber changes from small to big in dilatation section, and the dilatation mechanism includes sliding block 6,
Sliding block 6 can be slided along the radial direction of pressure chamber 1, and the thickness of sliding block 6 is more than the wall thickness of pressure chamber 1, sliding block 6 and the side wall of pressure chamber 1
It is slidingly sealed, sliding block 6 is connected with the second rack towards the first rack 7 is connected on the side of mandril 5 on the free end of mandril 5
8, driving gear 10 and driven gear 11, driving gear 10 and driven gear 11 are rotatably connected on the lateral wall of the pressure chamber 1
Coaxially connected, driving gear 10 is engaged with the second rack 8, and driven gear 11 is engaged with the first rack 7；It is evacuated in section that setting can be into
What row vacuumized vacuumizes air extractor, and air extractor includes piston cylinder 14, the closing of 14 one end open one end of piston cylinder, piston cylinder
14 are fixed in pressure chamber 1, and the openend of piston cylinder 14 slidably connects piston 13 towards mold 2 in piston cylinder 14, on piston 13
It is connected with and piston 13 is allowed to keep the compression spring to offset with 14 blind end of piston cylinder, side of the piston 13 far from compression spring is equipped with bearing rod
12, bearing rod 12 through piston cylinder 14 blind end and be slidably connected on piston cylinder 14, bearing rod 12 is towards the freedom of mandril 5
It holds and parallel with mandril 5, the blind end of piston cylinder 14 is connected with pressure chamber 1, and piston cylinder 14 is equipped with only supplied gas by piston cylinder 14
The interior check valve 15 discharged outside piston cylinder 14；
(4) direction that push rod 4 drives punch 9 from dilatation section to pumping section moves, and molten metal is pressed into cavity；
(5) cavity is vacuumized.
Push rod 4 drives punch 9 to be moved from dilatation section to pumping section.Punch 9 is in low-speed stage in dilatation section and low speed is transported
Dynamic, the second rack 8 on mandril 5 drives driving gear 10 to rotate, and driving gear 10 drives driven gear 11 to rotate, driven gear
11 the first racks 7 of driving are slided with movable slider 6 along the Inside To Outside of pressure chamber 1, so as to expand the volume of pressure chamber 1, the second rack 8
When being disengaged from driving gear 10, the one side of sliding block 6 towards 1 inside of pressure chamber is concordant with the madial wall of pressure chamber 1.Sliding block 6 moves
During constantly expand the volume of dilatation section, may be such that and a degree of vacuum degree is formed in pressure chamber 1, conducive in molten metal
Gas is precipitated under the action of vacuum from molten metal, and the gas of precipitation can be in metal also interior formation bubble and in the effect of buoyancy
Together with being built up under pushing with punch 9, and the low-speed motion of punch 9 is set aside some time for the precipitation of gas in molten metal simultaneously.
When punch 9 moves to high speed stage and high-speed motion, mandril 5 offset more than dilatation Duan Houyu bearing rods 12, push bearing rod 12
14 compression press spring of piston cylinder is driven, generating vacuum in piston cylinder 14 is drawn into the bubble in pressure chamber 1 in piston cylinder 14, removal pressure
Gas in room 1.It is die casting for shell part that punch 9, which continues to move by the molten metal press-in mold cavity forming in pressure chamber 1,.5 backhaul of mandril
During movement, compression spring pushes piston 13 to reset, and is discharged from check valve 15 by the gas in piston cylinder 14.
Above-described is only the embodiment of the present invention, and the common sense such as well known concrete structure and characteristic are not made herein in scheme
Excessive description.It, without departing from the structure of the invention, can be with it should be pointed out that for those skilled in the art
Several modifications and improvements are made, these should also be considered as protection scope of the present invention, these all do not interfere with what the present invention was implemented
Effect and practical applicability.The scope of protection required by this application should be based on the content of the claims, in specification
The records such as specific embodiment can be used for explaining the content of claim.
Claims (6)
1. reduce the processing technology that die casting for shell part generates stomata, it is characterised in that：Include the following steps：
(1) using the pressure chamber of straight-tube shape, one end of pressure chamber is connected with the cavity of mold, the other end of pressure chamber open up for molten metal into
The feed inlet entered sets punch in pressure chamber, push rod is coaxially disposed on punch, push rod makees straight reciprocating motion；
(2) pressure chamber is divided into dilatation section and pumping section towards the direction of mold by feed inlet along pressure chamber, dilatation section is located at die casting
The low-speed stage of journey, pumping section are located at the high speed stage of press casting procedure；
(3) setting can make the dilatation mechanism that pressure chamber volume changes from small to big in dilatation section, be evacuated what setting in section can be vacuumized
Vacuumize air extractor；
(4) direction that push rod drives punch from dilatation section to pumping section moves, and molten metal is pressed into cavity.
2. the processing technology according to claim 1 for reducing die casting for shell part and generating stomata, it is characterised in that：The push rod
The upper parallel connection mandril parallel with push rod.
3. the processing technology according to claim 2 for reducing die casting for shell part and generating stomata, it is characterised in that：The dilatation
Mechanism includes sliding block, and sliding block can be slided along the radial direction of pressure chamber, and the thickness of sliding block is more than the wall thickness of pressure chamber, sliding block and pressure chamber
Side walls sealing, sliding block is connected with the second tooth towards the first rack is connected on the side of mandril on the free end of mandril
Item is rotatably connected to driving gear and driven gear on the lateral wall of the pressure chamber, and driving gear is coaxially connected with driven gear,
Driving gear is engaged with the second rack, and driven gear is engaged with the first rack.
4. the processing technology according to claim 3 for reducing die casting for shell part and generating stomata, it is characterised in that：The pumping
Device includes piston cylinder, and the closing of piston cylinder one end open one end, piston cylinder is fixed in pressure chamber, and the openend of piston cylinder is towards mould
Have, piston is slidably connected in piston cylinder, be connected on piston and piston is allowed to keep the compression spring to offset with piston cylinder seal, piston
Side far from compression spring is equipped with bearing rod, and bearing rod runs through the blind end of piston cylinder and is slidably connected on piston cylinder, load
Towards the free end of mandril and parallel with mandril, the blind end of piston cylinder connects bar with pressure chamber.
5. the processing technology according to claim 4 for reducing die casting for shell part and generating stomata, it is characterised in that：The piston
Cylinder is equipped with only supplied gas from the check valve discharged outside piston cylinder in piston cylinder.
6. the processing technology according to claim 1 for reducing die casting for shell part and generating stomata, it is characterised in that：Further include step
Suddenly (5)：Cavity is vacuumized.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810069089.5A CN108176835B (en) | 2018-01-24 | 2018-01-24 | Reduce the processing technology that die casting for shell part generates stomata |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810069089.5A CN108176835B (en) | 2018-01-24 | 2018-01-24 | Reduce the processing technology that die casting for shell part generates stomata |
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| Publication Number | Publication Date |
|---|---|
| CN108176835A true CN108176835A (en) | 2018-06-19 |
| CN108176835B CN108176835B (en) | 2019-08-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810069089.5A Active CN108176835B (en) | 2018-01-24 | 2018-01-24 | Reduce the processing technology that die casting for shell part generates stomata |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113042703A (en) * | 2021-01-12 | 2021-06-29 | 深圳市宏泰丰盛科技有限公司 | Machining process for reducing air holes generated in shell die casting |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54143728A (en) * | 1978-04-28 | 1979-11-09 | Koujirou Yamazaki | Low pressure high speed vacuum casting |
| DE4216773A1 (en) * | 1992-05-21 | 1993-11-25 | Kurt Loeffler Druckgus Gmbh & | Injection moulding appts. for metal vacuum injection moulding - comprises vent channel from mould cavity connected by valve to vacuum pump and metal sensor in injection channel and/or piston position switch to close vacuum valve |
| CN201091909Y (en) * | 2007-08-24 | 2008-07-30 | 云南铜业压铸科技有限公司 | Die chamber for inductive motor copper squirrel cage rotor die-casting die |
| CN103567413A (en) * | 2013-09-30 | 2014-02-12 | 胜赛思精密压铸（扬州）有限公司 | Die-casting device for solving air hole defect of die-casting product and die-casting process thereof |
| CN105642862A (en) * | 2015-12-31 | 2016-06-08 | 宇龙计算机通信科技(深圳)有限公司 | Vacuum die-casting device and method |
-
2018
- 2018-01-24 CN CN201810069089.5A patent/CN108176835B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54143728A (en) * | 1978-04-28 | 1979-11-09 | Koujirou Yamazaki | Low pressure high speed vacuum casting |
| DE4216773A1 (en) * | 1992-05-21 | 1993-11-25 | Kurt Loeffler Druckgus Gmbh & | Injection moulding appts. for metal vacuum injection moulding - comprises vent channel from mould cavity connected by valve to vacuum pump and metal sensor in injection channel and/or piston position switch to close vacuum valve |
| CN201091909Y (en) * | 2007-08-24 | 2008-07-30 | 云南铜业压铸科技有限公司 | Die chamber for inductive motor copper squirrel cage rotor die-casting die |
| CN103567413A (en) * | 2013-09-30 | 2014-02-12 | 胜赛思精密压铸（扬州）有限公司 | Die-casting device for solving air hole defect of die-casting product and die-casting process thereof |
| CN105642862A (en) * | 2015-12-31 | 2016-06-08 | 宇龙计算机通信科技(深圳)有限公司 | Vacuum die-casting device and method |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113042703A (en) * | 2021-01-12 | 2021-06-29 | 深圳市宏泰丰盛科技有限公司 | Machining process for reducing air holes generated in shell die casting |
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| CN108176835B (en) | 2019-08-09 |
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