CN1550559A - Die surface intensifying process - Google Patents
Die surface intensifying process Download PDFInfo
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- CN1550559A CN1550559A CNA2004100396715A CN200410039671A CN1550559A CN 1550559 A CN1550559 A CN 1550559A CN A2004100396715 A CNA2004100396715 A CN A2004100396715A CN 200410039671 A CN200410039671 A CN 200410039671A CN 1550559 A CN1550559 A CN 1550559A
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- die surface
- mould
- treatment process
- strengthening treatment
- surface strengthening
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- 238000000034 method Methods 0.000 title claims abstract description 39
- 238000012545 processing Methods 0.000 claims abstract description 17
- 239000004576 sand Substances 0.000 claims abstract description 16
- 239000008187 granular material Substances 0.000 claims abstract description 10
- 239000011521 glass Substances 0.000 claims abstract description 7
- 239000000919 ceramic Substances 0.000 claims abstract description 4
- 239000000463 material Substances 0.000 claims description 28
- 238000005728 strengthening Methods 0.000 claims description 26
- 230000002950 deficient Effects 0.000 claims description 4
- 239000007769 metal material Substances 0.000 claims description 3
- 230000002929 anti-fatigue Effects 0.000 abstract description 2
- 229910052751 metal Inorganic materials 0.000 abstract description 2
- 239000002184 metal Substances 0.000 abstract description 2
- 239000011324 bead Substances 0.000 abstract 1
- 230000007547 defect Effects 0.000 abstract 1
- 239000008188 pellet Substances 0.000 abstract 1
- 238000005488 sandblasting Methods 0.000 abstract 1
- 238000012360 testing method Methods 0.000 description 29
- 229910000831 Steel Inorganic materials 0.000 description 11
- 239000010959 steel Substances 0.000 description 11
- 238000004381 surface treatment Methods 0.000 description 8
- 238000005498 polishing Methods 0.000 description 7
- 238000005299 abrasion Methods 0.000 description 5
- 238000003754 machining Methods 0.000 description 5
- 238000005496 tempering Methods 0.000 description 5
- 244000137852 Petrea volubilis Species 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 238000004512 die casting Methods 0.000 description 3
- 238000005242 forging Methods 0.000 description 3
- 230000003245 working effect Effects 0.000 description 3
- 241000863032 Trieres Species 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000009661 fatigue test Methods 0.000 description 2
- 239000012943 hotmelt Substances 0.000 description 2
- 230000003116 impacting effect Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000003672 processing method Methods 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
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- CXOWYMLTGOFURZ-UHFFFAOYSA-N azanylidynechromium Chemical compound [Cr]#N CXOWYMLTGOFURZ-UHFFFAOYSA-N 0.000 description 1
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- 238000000280 densification Methods 0.000 description 1
- 230000001066 destructive effect Effects 0.000 description 1
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- 230000008030 elimination Effects 0.000 description 1
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- 231100000869 headache Toxicity 0.000 description 1
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- 238000000465 moulding Methods 0.000 description 1
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- 238000007517 polishing process Methods 0.000 description 1
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- Mounting, Exchange, And Manufacturing Of Dies (AREA)
Abstract
The method includes steps: (1) carrying out operation of eliminating stress for finished dies; (2) carrying out procedure of sand blasting by using ceramics sand; (3) processing operation of beads striking: successional striking surface of die by pellet type granules made from metal or glass in high speed. The said processes has the advantages of more rigid surface, increasing compressive stress, reducing crazing and other defects so as to raise performance of antifatigue of the die.
Description
Technical field
The invention relates to a kind of die surface treatment process, refer to a kind of die surface strengthening treatment process that promotes mould material surface structure properties especially.
Background technology
Die casting and forging mold are in the process processing treatment or after producing for some time; regular meeting forms defective or residual tension stress (tensile stress) at die surface; this surface imperfection or residual stress often cause mould destructive root, and reduce the work-ing life of mould.Moreover mould is the quality problem that the mould dealer has a headache most using heat crack and the heat erosion phenomenon that is produced after the short period of time, and also related maintenance cost problem and the manufacturing cost of making significantly increased sharply.And most courses of processing comprise that electrodischarge machining(E.D.M.), line cutting processing and surfaces nitrided processing etc. all can form the white layer of sclerosis at die surface and cause the die surface embrittlement, reduce the die production life-span.Therefore, how solving the shortcoming of aforementioned die casting and its surface hardness of forging mold, and further strengthen the die surface structure organization, with the maintenance cost that reduces mould and extend work-ing life, really is that industry more should be made great efforts the emphasis direction researching and developing, break through.
Therefore, the present invention is directed to the problems referred to above and propose a kind of die surface strengthening treatment process, improve the easy abrasive shortcoming in traditional moulds surface.
Summary of the invention
Main purpose of the present invention is to provide a kind of die surface strengthening treatment process, and it is to form a hardened layer in die surface, to increase mould strength and hardness, makes the more compactness of organizing of die surface.
Secondary objective of the present invention is to provide a kind of die surface strengthening treatment process, to increase the thermal fatigue strength of mould.
Another purpose of the present invention is to provide a kind of die surface strengthening treatment process, to increase the heat resistanceheat resistant aggressiveness of mould.
Another purpose of the present invention is to provide a kind of die surface strengthening treatment process, to prolong the work-ing life of mould.
The invention provides a kind of die surface strengthening treatment process for reaching above-mentioned purpose, it includes the following step:
A. mould is carried out the operation of stress relieving;
B. the mould behind stress relieving carries out the sandblast schedule of operation with sand body;
C. mould enters pearl and hits processing through the sandblast schedule of operation is follow-up, and it is with the nearly ball-shaped granule of successional hard high-speed impact die surface;
By preceding method, make die surface harder and effectively increase its stress, reducing be full of cracks and other defective, and and then increase the anti-tired property of mould.
Described die surface strengthening treatment process wherein is can earlier mould be cleaned and the hardness affirmation before this step a.
Described die surface strengthening treatment process, wherein the operation of the stress relieving of this step a is a temper.
Described die surface strengthening treatment process, wherein to carry out the sand body of sandblast operation be ceramic sand to this step b.
Described die surface strengthening treatment process, wherein to carry out the sand body of sandblast operation be glass sand to this step b.
Described die surface strengthening treatment process, wherein to carry out the nearly ball-shaped granule of hard that pearl hits processing be the metal material to this step c.
Described die surface strengthening treatment process, wherein to carry out the nearly ball-shaped granule of hard that pearl hits processing be the glass material to this step c.
From the above, the treatment process of the present invention's one die surface strengthening is that known mould is at first carried out stress relieving, with sand body die surface is carried out the sandblast operation then, carry out pearl at last again and hit processing, improve surface strength and make the surface form compression, organize more fine and close and improve material surface hardness and flexible hardened layer to form one at die surface, and remove the white layer of die surface discharge.
Description of drawings
The 1st figure is the schematic flow sheet of die surface strengthening treatment process of the present invention;
Fig. 2 is that die surface forms the synoptic diagram of a hardened layer after utilizing the present invention that mould is carried out surface Hardening Treatment.
Fig. 3 is the present invention carries out the medium bump to die surface a synoptic diagram.
Fig. 4 is after the present invention carries out surface treatment to mould, the synoptic diagram that the die surface compact structure forms;
Fig. 5 is the result of fatigue test (adopting the curved trier of getting of Moore formula revolution);
Fig. 6 decreases the result of test for hot melt;
Fig. 7 A is operating time and the temperature condition that carries out the heat crack test;
Fig. 7 B is that the mould that does not have through intensive treatment carries out the operating time of heat crack test and the graphic representation of temperature condition and be full of cracks generation;
Fig. 7 C schemes for the SEM that the mould that does not have the process intensive treatment carries out after heat crack is tested;
Fig. 7 D carries out the operating time of heat crack test and the graphic representation of temperature condition and be full of cracks generation for the mould through intensive treatment;
Fig. 7 E schemes for the SEM that the mould through intensive treatment carries out after heat crack is tested;
Fig. 8 utilizes the present invention that the test piece that mould carries out after the surface treatment is carried out surface strength bar chart relatively with the test piece after general known surface treatment;
Fig. 9 is a mould through the polishing of #220 sand paper again with the surface hardness result comparison of #400 sand paper polishing back with the different time of enhanced processing method gained;
Figure 10 utilizes the present invention that mould is carried out surface compact SEM figure after the surface treatment;
Figure 11 is after in the surface of the present invention, the case depth of mould and the graphic representation of stress value;
Figure 12 A is the SEM figure that known die surface contains white layer;
Figure 12 B is the SEM figure that the die surface after surface treatment of the present invention has been removed white layer;
Figure 13 A is that standard is just than impacting test piece specification figure;
Figure 13 B is the result of toughness test;
Figure 14 A is not for there being the abrasion result through the 8407-Ms steel of intensive treatment;
Figure 14 B is not for there being through behind its wear test of 8407-Ms steel of intensive treatment the situation of steel surface wearing and tearing;
Figure 14 C is the abrasion result of the 8407-Ms steel of process intensive treatment;
Figure 14 D is the situation through steel surface wearing and tearing behind its wear test of 8407-Ms steel of intensive treatment;
Figure 15 A is the center line average roughness (Ra) of mould after electrodischarge machining(E.D.M.) and SEM figure;
Figure 15 B is the center line average roughness (Ra) of mould after the #220 polished finish and SEM figure;
Figure 15 C is the center line average roughness (Ra) of mould after the #400 polished finish and SEM figure;
Figure 15 D is the center line average roughness (Ra) of mould after the mould intensive treatment and SEM figure.
Embodiment
For making constitutional features of the present invention and the effect reached are more had further instruction, careful assistant is cooperated with preferred embodiment figure, describes in detail as the back:
See also shown in Figure 1ly, die surface strengthening treatment process of the present invention is shown in step S10, at first mould is carried out the operation of stress relieving, and its stress relieving operation is that high tempering is handled; Continue as step S20, the mould behind stress relieving is carried out the sandblast schedule of operation with sand body; Then as step S30, to carry out pearl through the mould after the sandblast schedule of operation and hit processing, wherein this pearl hits that to handle be with the nearly ball-shaped granule of successional special hard high-speed impact die surface, so that die surface is harder and effectively increase its stress, to reduce be full of cracks and other defective, and and then increase the anti-tired property of mould, its result will form as shown in Figure 2, the kenel of formation one hardened layer 20 on a metal die 10.
Wherein be to clean mould earlier and the hardness affirmation before the step S10; because of die casting or forging mold through machining or before die trial produces; can residually there be remover, oil or other impurity in the surface usually; it can produce chemical transformation when high tempering; and may influence the die surface situation; so visual die surface situation judge whether to carry out the cleaning of mould earlier before temper stress is eliminated, and employed cleaning solvent is 70 ℃ a Mei Shakelong solvent again.
And the elimination of the stress of step S10 is to utilize temper to carry out, and its tempering of implementing is the high tempering between 500 ℃ ~ 600 ℃, 550 ℃ of its preferable temperature, 4 hours time, the mode of adopting air cooling.
The sand body that step S20 carries out the sandblast operation is to can be ceramic sand or glass sand, and the speed of sandblast and particulate size and time conditions are that blast media is the SiC of granularity 20～28 μ m, and speed is 50m/sec, time 30min.
It is to can be the metal material that step S30 carries out the nearly ball-shaped granule of hard that pearl hits processing, its nearly ball-shaped granule of hard that carries out that pearl hits processing is to can be the glass material, and the speed that pearl hits and particulate size and time conditions to be pearl hit medium is granularity 0.3mm steel ball, speed is 200m/sec, and the time is 40min.
The present invention is with one special in after the special medium high-speed impact material surface, forms one deck closely and the tissue (as shown in Figure 3, Figure 4) of compression at material surface, and the depth range of this zone of influence has about 0.07～0.10mm approximately usually.
Therefore, the advantage of die surface strengthening treatment process of the present invention is:
Can improve the thermal fatigue strength of mould.
See also the result of Fig. 5, can learn that the mould of crossing than non-processor through the antifatigue limit of the mould of intensive treatment is much higher by its result for fatigue test (adopting the curved trier of getting of Moore formula revolution).
Can improve the heat resistanceheat resistant aggressiveness of mould.
Fig. 6 decreases the result of test for hot melt, in this test is to adopt the nitrogenize material and the chromium nitride material of a undressed material and two comparatively common mould schedule of reinforcement processing and test comparison through the present invention, can learn that the weight loss of the material of strengthening through mould is minimum.
Can improve the heat crack of die surface.
See also Fig. 7, be the discussion of the experiment of chapping.Fig. 7 A to Fig. 7 E is operating time and the temperature condition that carries out the heat crack test, Fig. 7 B and Fig. 7 C be not for there being the result of mould after test through intensive treatment, Fig. 7 D and Fig. 7 E are the result of mould after test through intensive treatment, can observe through its crack performance of test piece after the intensive treatment more remarkable significantly by this experiment.
Can improve die surface intensity (as shown in Figure 8) and hardness.
Fig. 9 is a mould through the polishing of #220 sand paper again with the surface hardness result comparison of #400 sand paper polishing back with the different time of enhanced processing method gained, by learning among the figure that in identical long intensive treatment time (process 3) can obtain higher hardness value under case depth.
Can make die surface organize comparatively fine and close (as shown in figure 10).
Can remove mould residual process stress.
Mould can form residual tension stress (tensilestress) at material surface usually through after the processing treatment, and this stress can cause the root of moulding stock surface imperfection.Utilize and of the present inventionly die surface is handled the stress under compression (compress stress) that is produced just in time tension stress is cancelled each other (as shown in figure 11) therewith, form the tissue of more little densification simultaneously at material surface, the surface imperfection of the material that makes is reduced, with the be full of cracks that prevents to produce because of fatigue.
Can remove the white layer of discharge of die surface.
See also Figure 12 A (known technology synoptic diagram) and Figure 12 B (the invention is intended to).Material is after electrodischarge machining(E.D.M.), and the white layer of the formed discharge of its material surface (EDM layer) is generally all removed with polishing (polish), to avoid material surface because of the fragility that the white layer that discharges is caused, makes material surface produce be full of cracks (crack); Yet, but can reduce the impact value of material on the contrary because of stress and the directivity that is produced in the polishing process.
Shown in Impulse Test Result, material is after EDM handles, and the mode of utilizing temper stress to eliminate can increase the impact value of material really, improves the toughness of material; After utilizing the present invention that mould is carried out surface treatment, its impact value is again apparently higher than tempering, and this is meaning the hardness that the present invention not only can improve material surface, also can increase the toughness of material surface simultaneously.Wherein in this test be adopt proper than impact test (charpy test) carry out through intensive treatment with without the mould toughness of intensive treatment relatively, the test piece specification be standard just than impacting test piece as shown in FIG. 13A, and can learn that by Figure 13 B the shock-resistant energy of the mould after intensive treatment is higher.
The time parameter of the test piece after the surface treatment of the present invention is quite big to the wear resistant and the frictional coefficient influence of material surface; Time is too short, then causes the material surface coefficient of friction to increase, and wear resistance reduces on the contrary; Along with the time increases, the material surface coefficient of friction reduces, and the result of surface hardness increase simultaneously increases wear resistance greatly; But the treatment time is long can't to increase its wear resistant on the contrary.
See also Figure 14 A to Figure 14 D, for carrying out the result of wear test, its test condition is load 10 newton (N), rotating speed: 272rpm/min, sliding velocity: 0.3m/sec, rotation radius: 21mm, most advanced and sophisticated abrasion ball is the chromium steel material, wherein Figure 14 A is not for there being the abrasion result through 8407-Ms (AISIH13) steel of intensive treatment, Figure 14 B is the situation of steel surface wearing and tearing behind its wear test, Figure 14 C is the abrasion result of the 8407-Ms steel of process intensive treatment, and Figure 14 D is the situation of steel surface wearing and tearing behind its wear test.
The surface finish that tool is high.
Figure 15 A to Figure 15 D respectively is the center line average roughness (Ra) of mould after electrodischarge machining(E.D.M.), #220 polishing, #400 polishing and mould intensive treatment, can learn thus through the Ra value of the test piece after the mould intensive treatment with polish through #400 after test piece close, have high surface finish.
The above, it only is a preferred embodiment of the present invention, be not to be used for limiting scope of the invention process,, all should be included in the claim of the present invention so the equalization of doing according to the described shape of the present patent application claim, structure, feature and spirit changes and modifies such as.
Claims (7)
1, a kind of die surface strengthening treatment process is characterized in that it includes the following step:
A. mould is carried out the operation of stress relieving;
B. the mould behind stress relieving carries out the sandblast schedule of operation with sand body;
C. mould enters pearl and hits processing through the sandblast schedule of operation is follow-up, and it is with the nearly ball-shaped granule of successional hard high-speed impact die surface;
By preceding method, make die surface harder and effectively increase its stress, reducing be full of cracks and other defective, and and then increase the anti-tired property of mould.
2, die surface strengthening treatment process according to claim 1 is characterized in that, wherein before this step a is can earlier mould be cleaned and the hardness affirmation.
3, die surface strengthening treatment process according to claim 1 is characterized in that, wherein the operation of the stress relieving of this step a is a temper.
4, die surface strengthening treatment process according to claim 1 is characterized in that, wherein to carry out the sand body of sandblast operation be ceramic sand to this step b.
5, die surface strengthening treatment process according to claim 1 is characterized in that, wherein to carry out the sand body of sandblast operation be glass sand to this step b.
6, die surface strengthening treatment process according to claim 1 is characterized in that, wherein to carry out the nearly ball-shaped granule of hard that pearl hits processing be the metal material to this step c.
7, die surface strengthening treatment process according to claim 1 is characterized in that, wherein to carry out the nearly ball-shaped granule of hard that pearl hits processing be the glass material to this step c.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410039671 CN1263871C (en) | 2003-03-12 | 2004-03-12 | Die surface intensifying process |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN03203472 | 2003-03-12 | ||
| CN03203472.5 | 2003-03-12 | ||
| CN 200410039671 CN1263871C (en) | 2003-03-12 | 2004-03-12 | Die surface intensifying process |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1550559A true CN1550559A (en) | 2004-12-01 |
| CN1263871C CN1263871C (en) | 2006-07-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200410039671 Expired - Lifetime CN1263871C (en) | 2003-03-12 | 2004-03-12 | Die surface intensifying process |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102554797A (en) * | 2010-12-23 | 2012-07-11 | 苏州春兴精工股份有限公司 | Surface sand blasting method for die casting mold |
| CN105840809A (en) * | 2016-05-18 | 2016-08-10 | 山东理工大学 | Real-time friction coefficient forward obtaining method in consideration of temperature rise |
| CN106112819A (en) * | 2016-07-01 | 2016-11-16 | 宜兴市凯诚模具有限公司 | A kind of surface treatment method of diel |
| CN109580058A (en) * | 2019-01-23 | 2019-04-05 | 福建省安元光学科技有限公司 | A method of mould product stress is judged using coating surface roughness |
-
2004
- 2004-03-12 CN CN 200410039671 patent/CN1263871C/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102554797A (en) * | 2010-12-23 | 2012-07-11 | 苏州春兴精工股份有限公司 | Surface sand blasting method for die casting mold |
| CN105840809A (en) * | 2016-05-18 | 2016-08-10 | 山东理工大学 | Real-time friction coefficient forward obtaining method in consideration of temperature rise |
| CN106112819A (en) * | 2016-07-01 | 2016-11-16 | 宜兴市凯诚模具有限公司 | A kind of surface treatment method of diel |
| CN109580058A (en) * | 2019-01-23 | 2019-04-05 | 福建省安元光学科技有限公司 | A method of mould product stress is judged using coating surface roughness |
| CN109580058B (en) * | 2019-01-23 | 2021-03-09 | 福建省安元光学科技有限公司 | Method for judging stress of die product by utilizing surface roughness of coating |
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| Publication number | Publication date |
|---|---|
| CN1263871C (en) | 2006-07-12 |
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