CN108246977A - A kind of restorative procedure of Ti alloy casting graphite mould surface hole defect - Google Patents
A kind of restorative procedure of Ti alloy casting graphite mould surface hole defect Download PDFInfo
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- CN108246977A CN108246977A CN201810039737.2A CN201810039737A CN108246977A CN 108246977 A CN108246977 A CN 108246977A CN 201810039737 A CN201810039737 A CN 201810039737A CN 108246977 A CN108246977 A CN 108246977A
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- graphite
- graphite mould
- mould
- alloy casting
- restorative procedure
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/12—Treating moulds or cores, e.g. drying, hardening
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/18—Finishing
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Powder Metallurgy (AREA)
Abstract
The invention discloses a kind of Ti alloy casting restorative procedures of graphite mould surface hole defect, include the following steps：Graphite powder is screened, the graphite powder after the sieving mesh of 100 mesh~150 is chosen, according to graphite powder：Binding agent mass ratio is 4:1~6:1 ratio is mixed, and is stirred evenly, then according to graphite powder：Alcohol quality ratio is 15:1~15:3 ratio adds in 95%~97% industrial absolute alcohol, stirs evenly, obtains graphite mould holes filling agent, spare；The agent of graphite mould holes filling is coated at the hole or hole of the graphite mould processed or graphite wicking surface, and scrapes and smear uniformly；The graphite mould repaired or graphite core are put into vacuum degassing stove and are heated to 900 DEG C~1000 DEG C, soaking time is 3h~4h, ≤ 20Pa is vacuumized, is roasted, degasification, graphite mould or graphite wicking surface are polished flat using the abrasive paper for metallograph of 400~600# in distribution type.
Description
Technical field
The invention belongs to Ti alloy casting technical fields, are related to a kind of reparation of Ti alloy casting graphite mould surface hole defect
Method.
Background technology
Since the thermo-chemical stability and refractoriness of graphite are high, only sent out with liquid titanium under the pouring temperature of titanium and titanium alloy
Raw faint reaction, can cast out the small casting of pure white, the stained layer thickness in surface, and machining graphite mould is led in Ti alloy casting
Domain has a wide range of applications.
In the selection of casting mold graphite, require to be less than 22~32% graphite in porosity, but for product in principle
The considerations of cost, for civilian goods Ti alloy casting use the common porosity of electrode graphite all 30% or so；And the army of being used for
The general porosity of high-strength graphite type that product use can be uneven due to granular size down to 5%~10%, but in isostatic pressed
Property, it also will appear fine pore sometimes.It, finally will in cast(ing) surface if do not repaired before casting to graphite mould surface
Protrusion can be formed or can generate graphite in cast(ing) surface and bonded, polishing amount is big or even some positions can not polish.Especially exist
Inner surface grades non-processing surface in flow path portion, if polish it is not in place if will influence complete machine working efficiency.
Existing graphite mould renovation technique is substantially with Y2O3For matrix, roasted after being repaired using binding agent, technique
Complexity, cost is very high, can not carry out batch reparation in actual production, and especially higher cost causes what the technique can not be applied
On civilian casting.
Invention content
The object of the present invention is to provide a kind of Ti alloy casting restorative procedures of graphite mould surface hole defect, solve existing
The problem of graphite mould renovation technique present in technology is of high cost, complex process.
The technical solution adopted in the present invention is a kind of restorative procedure of Ti alloy casting graphite mould surface hole defect, tool
Body includes the following steps：
Step 1：Prepare graphite mould holes filling agent
Graphite powder is screened, the graphite powder after sieving is chosen, according to graphite powder：Binding agent mass ratio is 4:1~6:1
Ratio mixed, and stir evenly, then according to graphite powder：Alcohol quality ratio is 15:1~15:3 ratio adds in wine
Essence stirs evenly, and obtains graphite mould holes filling agent, spare；
Step 2：Coat graphite mould surface
By graphite mould holes filling agent made from step 1 be coated in the graphite mould that processes or graphite wicking surface hole or
At hole, and scrape and smear uniformly；
Step 3：Graphite mould degasification and polishing
The graphite mould repaired or graphite core are put into vacuum degassing stove roasted, degasification, the sand paper in distribution type
Graphite mould or graphite wicking surface are polished flat.
The features of the present invention also characterized in that
The sieve mesh that graphite powder is sieved in step 1 is the mesh of 100 mesh~150.
In step 1, wetting agent is added in binding agent.
Binding agent is two acetic acid zirconiums, and wetting agent is fatty alcohol polyoxyethylene ether, and the additive amount of fatty alcohol polyoxyethylene ether
No more than the 0.5% of graphite powder quality.
In step 1, alcohol is 95%~97% industrial absolute alcohol.
In step 3, the heating temperature of vacuum degassing stove is 900 DEG C~1000 DEG C, and soaking time is 3h~4h, vacuumize≤
20Pa。
In step 3, Sand paper for polishing uses the abrasive paper for metallograph of 400~600#.
The invention has the advantages that a kind of Ti alloy casting restorative procedure of graphite mould surface hole defect of the present invention, stone
Black type hole repair filler is at low cost, simple for process, does not need to individually be roasted, and is roasted while graphite mould degasification
Burning can efficiently fill up the hole of graphite mould and more than graphite wicking surface 0.5mm, be suitble to the big rule of civilian titanium alloy casting
Mould uses, and has higher practical value.Description of the drawings
Fig. 1 is graphite powder and binding agent in a kind of restorative procedure of Ti alloy casting graphite mould surface hole defect of the present invention
Ratio is to the influence curve figure of using effect；
Fig. 2 is the ratio of graphite powder and alcohol in a kind of restorative procedure of Ti alloy casting graphite mould surface hole defect of the present invention
Example is to the influence curve figure of using effect；
Fig. 3 is using a kind of restorative procedure before processing graphite mould table of Ti alloy casting graphite mould surface hole defect of the present invention
The design sketch in face；
Fig. 4 is graphite mould table after the restorative procedure processing using a kind of Ti alloy casting graphite mould surface hole defect of the present invention
The design sketch in face.
Specific embodiment
The present invention is described in detail with reference to the accompanying drawings and detailed description.
A kind of Ti alloy casting restorative procedure of graphite mould surface hole defect of the present invention, specifically includes following steps：
Step 1：Prepare graphite mould holes filling agent
Graphite powder is screened, the graphite powder after sieving is chosen, according to graphite powder：Binding agent mass ratio is 4:1~6:1
Ratio mixed, and stir evenly, then according to graphite powder：Alcohol quality ratio is 15:1~15:3 ratio adds in wine
Essence stirs evenly, and obtains graphite mould holes filling agent, spare；
Step 2：Coat graphite mould surface
By graphite mould holes filling agent made from step 1 be coated in the graphite mould that processes or graphite wicking surface hole or
At hole, and scrape and smear uniformly；
Step 3：Graphite mould degasification and polishing
The graphite mould repaired or graphite core are put into vacuum degassing stove roasted, degasification, the sand paper in distribution type
Graphite mould or graphite wicking surface are polished flat.
The sieve mesh that graphite powder is sieved in step 1 is the mesh of 100 mesh~150.
In step 1, wetting agent is added in binding agent.
Binding agent is two acetic acid zirconiums, and wetting agent is fatty alcohol polyoxyethylene ether, and the additive amount of fatty alcohol polyoxyethylene ether
No more than the 0.5% of graphite powder quality.
In step 1, alcohol is 95%~97% industrial absolute alcohol.
In step 3, the heating temperature of vacuum degassing stove is 900 DEG C~1000 DEG C, and soaking time is 3h~4h, vacuumize≤
20Pa。
In step 3, Sand paper for polishing uses the abrasive paper for metallograph of 400~600#.
The ratio of a kind of restorative procedure of Ti alloy casting graphite mould surface hole defect of the present invention, graphite powder and binding agent and
The ratio of graphite powder and alcohol as depicted in figs. 1 and 2, works as graphite powder to the influence curve figure of using effect：The quality of binding agent
Than being 5:1, graphite powder：The mass ratio of alcohol is 15:When 2, using effect is best.
Using a kind of restorative procedure of Ti alloy casting graphite mould surface hole defect of the present invention, to graphite mould or graphite core table
Respectively as shown in Figure 3 and Figure 4, after processing, graphite mould or the improvement of graphite core surface quality are as follows for the effect of face progress before and after the processing：
Graphite mould or the hole quantity of graphite wicking surface are by 67/m2Become 13/m2, hole more than more than 0.5mm or
Hole is filled up completely, and maximum pore size becomes 0.4mm from original 2.8mm.
Surface quality of continuous castings after cast improves as follows：
After the completion of former technique casting, the current mark and buildup of cast(ing) surface share at 68/m2, method progress using the present invention
After processing, the trace and buildup of cast(ing) surface are reduced at 5/m2, runner inner surface polishing workload greatly reduce.
A kind of restorative procedure of Ti alloy casting graphite mould surface hole defect of the present invention, filler are combined with graphite mould surface
Property is good, not easily to fall off, and can effectively fill up the hole of graphite mould and more than graphite wicking surface 0.5mm, effectively improves titanium alloy casting
The surface quality of part reduces polishing degree.
Embodiment 1
A kind of Ti alloy casting restorative procedure of graphite mould surface hole defect of the present invention, specifically includes following steps：
Step 1：Prepare graphite mould holes filling agent
Graphite powder is screened, the graphite powder after 120 mesh of sieving is chosen, according to graphite powder：Binding agent mass ratio is 5:1
Ratio mixed, and stir evenly, then according to graphite powder：Alcohol quality ratio is 15:2 ratio adds in 96% industry
Absolute alcohol stirs evenly, and obtains graphite mould holes filling agent, spare；
Step 2：Coat graphite mould surface
By graphite mould holes filling agent made from step 1 be coated in the graphite mould that processes or graphite wicking surface hole or
At hole, and scrape and smear uniformly；
Step 3：Graphite mould degasification and polishing
The graphite mould repaired or graphite core are put into vacuum degassing stove and are heated to 950 DEG C, soaking time 3.5h, is taken out
Vacuum≤20Pa is roasted, degasification, is polished flat graphite mould or graphite wicking surface using the abrasive paper for metallograph of 500# in distribution type
It is whole.
Embodiment 2
A kind of Ti alloy casting restorative procedure of graphite mould surface hole defect of the present invention, specifically includes following steps：
Step 1：Prepare graphite mould holes filling agent
Graphite powder is screened, the graphite powder after 100 mesh of sieving is chosen, according to graphite powder：Binding agent mass ratio is 4:1
Ratio mixed, and stir evenly, then according to graphite powder：Alcohol quality ratio is 15:1 ratio adds in 95% industry
Absolute alcohol stirs evenly, and obtains graphite mould holes filling agent, spare；
Step 2：Coat graphite mould surface
By graphite mould holes filling agent made from step 1 be coated in the graphite mould that processes or graphite wicking surface hole or
At hole, and scrape and smear uniformly；
Step 3：Graphite mould degasification and polishing
The graphite mould repaired or graphite core are put into vacuum degassing stove and are heated to 900 DEG C, soaking time 3h, is taken out true
Sky≤20Pa is roasted, degasification, is polished flat graphite mould or graphite wicking surface using the abrasive paper for metallograph of 400# in distribution type
It is whole.
Embodiment 3
A kind of Ti alloy casting restorative procedure of graphite mould surface hole defect of the present invention, specifically includes following steps：
Step 1：Prepare graphite mould holes filling agent
Graphite powder is screened, the graphite powder after 150 mesh of sieving is chosen, according to graphite powder：Binding agent mass ratio is 6:1
Ratio mixed, and stir evenly, then according to graphite powder：Alcohol quality ratio is 15:3 ratio adds in 97% industry
Absolute alcohol stirs evenly, and obtains graphite mould holes filling agent, spare；
Step 2：Coat graphite mould surface
By graphite mould holes filling agent made from step 1 be coated in the graphite mould that processes or graphite wicking surface hole or
At hole, and scrape and smear uniformly；
Step 3：Graphite mould degasification and polishing
The graphite mould repaired or graphite core are put into vacuum degassing stove and are heated to 1000 DEG C, soaking time 4h, is taken out
Vacuum≤20Pa is roasted, degasification, is polished flat graphite mould or graphite wicking surface using the abrasive paper for metallograph of 600# in distribution type
It is whole.
Embodiment 4
A kind of Ti alloy casting restorative procedure of graphite mould surface hole defect of the present invention, specifically includes following steps：
Step 1：Prepare graphite mould holes filling agent
Graphite powder is screened, the graphite powder after 110 mesh of sieving is chosen, according to graphite powder：Binding agent mass ratio is 4:1
Ratio mixed, and stir evenly, then according to graphite powder：Alcohol quality ratio is 15:3 ratio adds in 97% industry
Absolute alcohol stirs evenly, and obtains graphite mould holes filling agent, spare；
Step 2：Coat graphite mould surface
By graphite mould holes filling agent made from step 1 be coated in the graphite mould that processes or graphite wicking surface hole or
At hole, and scrape and smear uniformly；
Step 3：Graphite mould degasification and polishing
The graphite mould repaired or graphite core are put into vacuum degassing stove and are heated to 930 DEG C, soaking time 4h, is taken out true
Sky≤20Pa is roasted, degasification, is polished flat graphite mould or graphite wicking surface using the abrasive paper for metallograph of 450# in distribution type
It is whole.
Embodiment 5
A kind of Ti alloy casting restorative procedure of graphite mould surface hole defect of the present invention, specifically includes following steps：
Step 1：Prepare graphite mould holes filling agent
Graphite powder is screened, the graphite powder after 140 mesh of sieving is chosen, according to graphite powder：Binding agent mass ratio is 6:1
Ratio mixed, and stir evenly, then according to graphite powder：Alcohol quality ratio is 15:1 ratio adds in 95% industry
Absolute alcohol stirs evenly, and obtains graphite mould holes filling agent, spare；
Step 2：Coat graphite mould surface
By graphite mould holes filling agent made from step 1 be coated in the graphite mould that processes or graphite wicking surface hole or
At hole, and scrape and smear uniformly；
Step 3：Graphite mould degasification and polishing
The graphite mould repaired or graphite core are put into vacuum degassing stove and are heated to 980 DEG C, soaking time 4h, is taken out true
Sky≤20Pa is roasted, degasification, is polished flat graphite mould or graphite wicking surface using the abrasive paper for metallograph of 550# in distribution type
It is whole.
Claims (7)
1. a kind of Ti alloy casting restorative procedure of graphite mould surface hole defect, which is characterized in that specifically include following steps：
Step 1：Prepare graphite mould holes filling agent
Graphite powder is screened, the graphite powder after sieving is chosen, according to graphite powder：Binding agent mass ratio is 4:1~6:1 ratio
Example is mixed, and stir evenly, then according to graphite powder：Alcohol quality ratio is 15:1~15:3 ratio adds in alcohol, stirs
It mixes uniformly, obtains graphite mould holes filling agent, it is spare；
Step 2：Coat graphite mould surface
Graphite mould holes filling agent made from step 1 is coated in the hole or hole of the graphite mould processed or graphite wicking surface
Place, and scrape and smear uniformly；
Step 3：Graphite mould degasification and polishing
The graphite mould repaired or graphite core are put into vacuum degassing stove roasted, degasification, in distribution type with sand paper by stone
Black type or graphite wicking surface polish flat.
2. a kind of restorative procedure of Ti alloy casting graphite mould surface hole defect according to claim 1, which is characterized in that
The sieve mesh that graphite powder is sieved in the step 1 is the mesh of 100 mesh~150.
3. a kind of restorative procedure of Ti alloy casting graphite mould surface hole defect according to claim 1, which is characterized in that
In the step 1, wetting agent is added in binding agent.
4. a kind of restorative procedure of Ti alloy casting graphite mould surface hole defect according to claim 3, which is characterized in that
The binding agent is two acetic acid zirconiums, and the wetting agent is fatty alcohol polyoxyethylene ether, and the fatty alcohol polyoxyethylene ether adds
Dosage is no more than the 0.5% of graphite powder quality.
5. a kind of restorative procedure of Ti alloy casting graphite mould surface hole defect according to claim 1, which is characterized in that
In the step 1, alcohol is 95%~97% industrial absolute alcohol.
6. a kind of restorative procedure of Ti alloy casting graphite mould surface hole defect according to claim 1, which is characterized in that
In the step 3, the heating temperature of vacuum degassing stove is 900 DEG C~1000 DEG C, and soaking time is 3h~4h, vacuumize≤
20Pa。
7. a kind of restorative procedure of Ti alloy casting graphite mould surface hole defect according to claim 1, which is characterized in that
In the step 3, Sand paper for polishing uses the abrasive paper for metallograph of 400~600#.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810039737.2A CN108246977A (en) | 2018-01-16 | 2018-01-16 | A kind of restorative procedure of Ti alloy casting graphite mould surface hole defect |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810039737.2A CN108246977A (en) | 2018-01-16 | 2018-01-16 | A kind of restorative procedure of Ti alloy casting graphite mould surface hole defect |
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