CN100417507C - Forging technology of poly (L-lactic acid) material and its mould - Google Patents
Forging technology of poly (L-lactic acid) material and its mould Download PDFInfo
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- CN100417507C CN100417507C CNB2005101210027A CN200510121002A CN100417507C CN 100417507 C CN100417507 C CN 100417507C CN B2005101210027 A CNB2005101210027 A CN B2005101210027A CN 200510121002 A CN200510121002 A CN 200510121002A CN 100417507 C CN100417507 C CN 100417507C
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Abstract
The present invention relates to a poly (L-lactic acid) material self-reinforcement directional forging process which can be used for producing an internal fixing device for fracture. A die blank is put in a die blank cavity of a special directional forging die with the temperature ranging from 80 DEG C to 160 DEG C, forging is carried out after one to two minutes, and time is limited within three to ten seconds. Pressure is kept, cooling is immediately carried out, and the temperature is cooled in two minutes to be below 50 DEG C. The pressure is relieved to open a die, and finished products are taken out. The present invention also relates to a special die which is composed of a main body, an upper die and a lower die, wherein the main body comprises a directional deformation cavity which is communicated up and down. The sizes and the shape design of the cross sections of the upper die and the lower die are consistent with the cross section of the directional deformation cavity. After the upper die and the lower die are respectively inserted in a closing die from the positions above and below the directional deformation cavity of the main body, the lower surface of the upper die, the upper surface of the lower die, and the periphery of the directional deformation cavity form a directional deformation hole channel which is equal to a cavity in the shape of a product. When the technology and the dies of the present invention are adopted, the requirements of the technology and devices are not high. Materials can not undergo high temperature for a long time, so the loss of molecular weight is relatively small. Consequently, devices of sections, such as poly (L-lactic acid) bars, screws, plates, etc. with initial flexural strength ranging from 220MPa to 280MPa and shearing strength ranging from 160MPa and 185MPa.
Description
Technical field
The present invention relates to a kind of Forging Technology of poly-(L-lactic acid) material, especially relate to a kind of directed Forging Technology that is used in poly-(L-lactic acid) the material self-reinforcing of making bone fracture internal fixing device spare.The invention still further relates to the particular manufacturing craft of this technology.
Background technology
PLA is a kind of aliphatic polyester plastics, is got by the lactide ring-opening polymerisation usually, has excellent biological compatibility, but the degradation in vivo absorption is widely used as biomedical material.But PLA does not reach as the requirement of making bone fracture internal fixing device spare if be difficult to obtain high mechanical strength with common plastics molding process.But then, PLA is by the machine-shaping of self-reinforcing technology, the chemical composition of its wild phase and matrix is identical, there is not wild phase and the matrix interface on chemical constitution, under the situation that need not introduce other reinforcing material, just can obtain the goods of higher mechanical strength, therefore, by the machine-shaping of self-reinforcing technology, be the Perfected process of research and development poly-lactic acid material as bone fracture internal fixing device spare.Screw, the intramedullary nail medical device product made from poly-(the L-lactic acid) and poly-(D, L-lactic acid) of the exploitation of self-reinforcing process technology such as (Kirschner wires) is applied clinically at present.In the self-reinforcing technology of PLA, mainly contain collection of filaments compression molding technology, directed free stretching technique, contraction stretching technology and solid-state extruding technology.It is above poly-(L-lactic acid) the bar device of 200MPa that these enhancing technology can make initial flexural strength, but technology and equipment has relatively high expectations, and in the collection of filaments compression molding technology, material also must at high temperature stand the long period, and loss of molecular weight is serious.
Summary of the invention
First purpose of the present invention is to provide a kind of directed Forging Technology that is used in poly-(L-lactic acid) the material self-reinforcing of making bone fracture internal fixing device spare, and equipment is less demanding, and material need not stand long-time high temperature, and loss of molecular weight is less relatively.
Processing step of the present invention is as follows:
To gather (L-lactic acid) is molded into sheet material with common die pressing and cuts out and cut the mould base of making certain size and shape;
The mould base is put into the mould base chamber of the special-purpose directed forge die of temperature between 110 ℃ to 115 ℃ Celsius;
The mould base is put into beginning upper die and lower die matched moulds forging and pressing after 1～2 minute, and time restriction is in 3～10 seconds;
Matched moulds keep-ups pressure and stops heating to the precalculated position, cools off immediately, require to make in 2 minutes mould together with the greenhouse cooling of finished product to being lower than 50 ℃;
When mold temperature was lower than 40 ℃, finished product was taken out in the pressure relief die sinking.
Second purpose of the present invention, be to provide a kind of forge die that is exclusively used in above-mentioned technology, form by main body and upper die and lower die, main body contains the directed deformation chamber about connecting, the size of upper die and lower die cross section is consistent with the cross section in directed deformation chamber with shaped design, and upper die and lower die constitute the directed deformation duct cavity that equals shape of product from the periphery that the directed deformation chamber upper and lower of main body injects behind the matched moulds by patrix lower surface, counterdie upper surface and directed deformation chamber respectively.
On the basis of the above, this mould further modification also:
Center, described directed deformation chamber has mould base chamber, and its shape is consistent with the mould base with size, and surface, mould base chamber is a rounding off with intersection, surface, directed deformation chamber.
Described mould base chamber can be consistent with directed deformation cavity direction or with vertical rectangular hole, directed deformation chamber or with the vertical circular hole in directed deformation chamber.
Have cooling-water duct, electrical bar jack in the described die main body and be thermometer hole, external respectively cooling water, be inserted with electrical bar, thermo detector.
When mould base chamber was vertically design, when promptly mould base chamber was consistent with directed deformation cavity direction, the directed deformation chamber in the die main body was promptly as mould base chamber; When mould base chamber was transverse design, when promptly mould base chamber was vertical with directed deformation chamber, its shape was consistent with the mould base with size; When mould base chamber was circular hole, its diameter equaled mould base diameter.
The self-reinforcing of the present invention also is applicable to poly-(L-lactic acid) composite.
Beneficial effect of the present invention: adopt technology of the present invention and mould, equipment is less demanding, material need not stand long-time high temperature, loss of molecular weight is less relatively, can produce initial flexural strength and reach section bar devices such as poly-(L-lactic acid) bar that 220～280MPa, shear strength reach 160～185MPa, screw, plate.
Description of drawings
The present invention is described in further detail below in conjunction with drawings and Examples.
Fig. 1 is the directed forge die main body cross-sectional schematic of mould embodiment 1 mould base chamber for vertically designing.
Fig. 2 is the A-A generalized section of Fig. 1.
Fig. 3 is the B-B generalized section of Fig. 2.
Fig. 4 looks schematic diagram for mould embodiment 1 patrix master.
Fig. 5 looks schematic diagram for the left side of Fig. 4.
Fig. 6 looks schematic diagram for mould embodiment 1 counterdie master.
Fig. 7 looks schematic diagram for the left side of Fig. 6.
Fig. 8 is that the directed forge die main body master of circular hole looks schematic diagram for mould embodiment 2 mould base chambeies.
Fig. 9 is the C-C generalized section of Fig. 8.
Figure 10 is the D-D generalized section of Fig. 9.
Figure 11 looks schematic diagram for mould embodiment 2 patrix masters.
Figure 12 looks schematic diagram for the left side of Figure 11.
Figure 13 is the elevational schematic view of Figure 11.
Figure 14 looks schematic diagram for mould embodiment 2 counterdie masters.
Figure 15 looks schematic diagram for the left side of Figure 14.
Figure 16 is the schematic top plan view of Figure 14.
Figure 17 is that the directed forge die main body master of transverse design looks schematic diagram for mould embodiment 3 mould base chambeies.
Figure 18 is the E-E generalized section of Figure 17.
Figure 19 is the F-F generalized section of Figure 18.
Figure 20 looks schematic diagram for mould embodiment 3 patrix masters.
Figure 21 looks schematic diagram for the left side of Figure 20.
Figure 22 is the elevational schematic view of Figure 20.
Figure 23 looks schematic diagram for mould embodiment 3 counterdie masters.
Figure 24 looks schematic diagram for the left side of Figure 23.
Figure 25 is the schematic top plan view of Figure 23.
Among the figure, 1 is patrix, and 2 is counterdie, and 3 is main body, and 4 is directed deformation chamber, and 5 is mould base chamber, and 6 is cooling-water duct, and 7 is the electrical bar jack, and 8 is thermometer hole, and 9 is the patrix alignment pin, and 10 is the main body locating hole.
The specific embodiment
Extremely shown in Figure 7 as Fig. 1, the mould embodiment 1 that is exclusively used in the directed Forging Technology that can be used in poly-(L-lactic acid) the material self-reinforcing of making bone fracture internal fixing device spare of the present invention, form by main body 3 and patrix 1, counterdie 2, main body 3 contains the directed deformation chamber 4 about connecting, also promptly long rectangular opening, also have cooling-water duct 6, electrical bar jack 7 in the main body and be thermometer hole 8, can external respectively cooling water, be inserted with electrical bar, thermo detector, mould base chamber 5 is vertically design in the main body, and the middle part in directed deformation chamber 4 is promptly as mould base chamber in this example; The cross section in the cross section of upper die and lower die and directed deformation chamber and mould base chamber adapts, it all is long rectangle, can be respectively inject matched moulds from directed deformation chamber 4 upper and lowers of main body, finally the periphery by patrix lower surface, counterdie upper surface and directed deformation chamber forms the directed duct cavity that equals finished form, and the mould base is full of the directed duct moulding that the periphery by upper die and lower die and directed deformation chamber constitutes under the pressure of upper and lower mould.
For example, to device such as the pole and the screw of common column type, directed duct is circular, and the diameter in duct and length are then determined by the diameter and the length of device; For sheet material, directed duct is a rectangle, and its size and length are equally by the sheet material decision that will make.The directed deformation duct that constitutes with the periphery in directed deformation chamber behind patrix and the counterdie matched moulds, its size and shape are identical with resulting devices or goods.In the directed forging and pressing process, directed deformation takes place along with the matched moulds of patrix and counterdie in the mould base, final form with by the directional hole road shape and the big or small identical goods that constitute with the periphery in directed deformation chamber behind the upper die and lower die matched moulds.
Extremely shown in Figure 16 as Fig. 8, particular manufacturing craft embodiment 2 of the present invention, difference from Example 1 is that described mould base chamber is the circular hole of certain pore size, is arranged in the centre in the directed deformation chamber of directed die main body, its diameter equals mould base diameter; Surface, mould base chamber is an arc transition with intersection, surface, directed deformation chamber, and the R of transition arc is 6 millimeters.
Extremely shown in Figure 25 as Figure 17, particular manufacturing craft embodiment 3 of the present invention, difference from Example 1 is that described mould base chamber becomes the transverse design of vertical direction with directed deformation chamber, is arranged in the centre in the directed deformation chamber of directed die main body, and its shape is consistent with the mould base with size.Surface, mould base chamber is an arc transition with intersection, surface, directed deformation chamber, and the R of transition arc is 8 millimeters.
The orientation forging and pressing of poly-(L-lactic acid) strengthen mainly by following factor decision: (1) forging and pressing temperature.The forging and pressing temperature is high more, and the degree of orientation of strand and crystallite is on the low side, and the mechanical strength of forging and pressing goods is on the low side, otherwise strengthens.(2) cooling velocity.After being swaged into precalculated position (generally being the position of patrix and counterdie matched moulds), cool off rapidly.Cooling velocity is fast more, helps obtaining high-intensity forging and pressing goods more.(3) mould base deformation ratio.The ratio of the length of definition forging forming goods and the length of mould base (be applicable to mould base chamber design for vertical and horizontal) or diameter (be applicable to mould base chamber design for circular hole) is the deformation ratio of mould base.The big more intensity that helps improving goods or device more of mould base deformation ratio.
In addition, the degree of crystallinity of poly-(L-lactic acid) mould base is also influential to the intensity of forging and pressing goods.Degree of crystallinity is high more, and the mechanical strength of forging and pressing goods is also high more.
(1) forging and pressing temperature.The crystalline melt temperature of poly-(L-lactic acid) is generally 175～185 ℃, about 60 ℃ of glass transition temperatures.The forging and pressing temperature can be selected between its glass transition temperature and the crystalline melt temperature, and with at 110 ℃～115 ℃ for well.The forging and pressing temperature is low excessively, and product quality and yield rate reduce, and the forging and pressing temperature is too high, and the mechanical strength of product is on the low side.
(2) cooling velocity.Cooling velocity should The faster the better.The general requirement after the forging and pressing operation is finished, promptly be swaged into the precalculated position after, cool off immediately.Preferably can be in 2 minutes greenhouse cooling during from the forging and pressing beginning to being lower than 50 ℃ for well, to shorten press forging annealing time in forge die as far as possible.For reaching fast cold effect, mould must be provided with the passage of logical cooling water, and in case the forging and pressing operation is finished, cuts off the thermal source that imposes on mould immediately, feeds water quench simultaneously.
(3) mould base deformation ratio.The degree of orientation of mould base deformation ratio decision mould base in orientation forging and pressing process.Mould base deformation ratio is big more, and the degree of orientation of mould base in the forging and pressing process is high more, and the mechanical strength of forging and pressing product is just high more.For the mould base chamber of vertical and horizontal designs, mould base deformation ratio can be controlled between 2～12, but with between 4～9 for well.Deformation ratio compared low, and the mechanical strength of goods is on the low side; Deformation ratio is too high, and the yield rate of forging and pressing reduces.For example will make diameter is that 3mm, length are the pole of 100mm, with 15 * 15.6 * 3mm
3Mould base forging forming, the length of pole is 100/15.6=6.4 or 100/15=6.7 with the ratio of the length of mould base.For the mould base chamber of circular hole design, mould base deformation ratio can be controlled between 12～20.For example will make diameter is that 3mm, length are the pole of 100mm, is that 7mm, height are the cylindrical mould base of 18.5mm with diameter, and the deformation ratio (100/7) of this moment is 14.3.
The speed of exerting pressure.(the directed forging press that is reaching preset temperature was usually put into the mould base after 1～2 minute, and the size of looking the mould base is slightly variant, but influence is little) exerts pressure after mould base temperature reaches balance substantially, and course of exerting pressure should be finished in 3～10 seconds.When keep-uping pressure, immediately directed forging press is fed the cold water cooling.Treat that directed forging press temperature reduces to below 50 ℃, pressure relief is taken out product.Course of exerting pressure is long, or not cooling immediately after exerting pressure, or cooldown rate is slow excessively, all press forging is produced deorientation, and can cause that the degree of crystallinity of press forging and crystallite dimension increase, and are unfavorable for the raising and the result of use of final products.
The directed Forging Technology embodiment 1～4 that is used in poly-(L-lactic acid) the material self-reinforcing of making bone fracture internal fixing device spare of the present invention:
Requiring finished product is poly-(L-lactic acid) pole of φ 3.2mm, long 100mm, adopt the directed forge die of mould base chamber of mould embodiment 1 for vertically designing for this reason, directed deformation chamber horizontal length is 100mm, and the directed duct that constitutes during the upper die and lower die matched moulds is the cavity of diameter 3.2mm, long 100mm; Mould embodiment 1 is installed in the hydraulic press.
Processing step is as follows:
To gather (L-lactic acid) is molded into sheet material with common die pressing and cuts out to cut again and make the rectangular mold base (the concrete numerical value of each example see Table 1) of deformation ratio between 5～8;
At first set the forging and pressing temperature during beginning, treat mould embodiment 1 be warming up to design temperature and stable after, put the mould base into medium position that mould base chamber also is directed die main body deformation chamber;
The mould base is put into beginning upper die and lower die matched moulds forging and pressing after 1 minute, and matched moulds finishes fully in 5 second time;
Keep-up pressure and cut off thermal source, the cooling of water flowing immediately, the greenhouse cooling that made mould in 2 minutes is to (being lower than the T of poly-(L-lactic acid) to 50 ℃
g);
When mold temperature was lower than 40 ℃, finished product was taken out in the pressure relief die sinking.
Obtain poly-(L-lactic acid) pole of φ 3.2mm, long 100mm.Related parameter is arranged and the results are shown in Table 1.
Table 1
| Embodiment | The forging and pressing temperature/℃ | Mould base size (thick * length * height)/mm | Mould base deformation ratio | Bending strength/MPa (line-of-sight course) | Shear strength/MPa |
| 1 | 110 | 3.2×12.6×20 | 7.9 | 265±20 | 165±16 |
| 2 | 110 | 3.2×20×12.6 | 5.0 | 248±21 | 163±18 |
| 3 | 130 | 3.2×12.6×20 | 7.9 | 240±22 | 164±18 |
| 4 | 130 | 3.2×20×12.6 | 5.0 | 235±21 | 162±18 |
Forging Technology embodiment 5～8:
Requiring finished product is poly-(L-lactic acid) pole of φ 3mm, long 100mm, the mould base chamber of for this reason adopting mould embodiment 2 is the directed forge die of circular hole, directed deformation chamber horizontal length is 100mm, and the directed duct that constitutes during the upper die and lower die matched moulds is the cavity of diameter 3mm, long 100mm; Mould embodiment 2 is installed in the hydraulic press.
Processing step is as follows:
To gather (L-lactic acid) and make pole, and cut out to cut again and make the cylindrical mould base (the concrete numerical value of each example see Table 2) of deformation ratio between 14～25 with common die pressing or injection molding method, extrusion molding;
At first set the forging and pressing temperature during beginning, treat mould embodiment 2 be warmed up to design temperature and stable after, put the mould base into mould base chamber;
The mould base is put into beginning upper die and lower die matched moulds forging and pressing after 1 minute, and matched moulds finishes fully in 5 second time;
Keep-up pressure and cut off thermal source, the cooling of water flowing immediately, the greenhouse cooling that made mould in 2 minutes is to (being lower than the T of poly-(L-lactic acid) to 50 ℃
g);
When mold temperature was lower than 40 ℃, finished product was taken out in the pressure relief die sinking.
Obtain poly-(L-lactic acid) pole of φ 3mm, long 100mm.Related parameter is arranged and the results are shown in Table 2.
Table 2
| Embodiment | The forging and pressing temperature/℃ | Mould base size (diameter * height)/mm | Mould base deformation ratio | Bending strength/MPa (line-of-sight course) | Shear strength/ |
| 5 | 110 | 7×18.5 | 14.3 | 266±12 | 166±6 |
| 6 | 130 | 7×18.5 | 14.3 | 247±9 | 164±7 |
| 7 | 110 | 6×25 | 25 | 272±12 | 167±11 |
| 8 | 130 | 6×25 | 25 | 253±12 | 163±8 |
Forging Technology embodiment 9～12
The requirement finished product is poly-(L-lactic acid) screw of M4.2 * 50, adopt the mould base chamber of mould embodiment 1 as Forging Technology embodiment 1 earlier is the directed forge die of circular hole for this reason, directed deformation chamber horizontal length is 100mm, but the directed duct that constitutes during the upper die and lower die matched moulds is the cavity of diameter 4mm, long 100mm; Respectively be the pole of 50mm prefabricated component with make two as screw.According to the directed mould design of mould embodiment 1, the duct that constitutes when making the upper die and lower die matched moulds is that the screw of M4.2 * 1.5, long 50mm manufactures and designs the rib-loop mould.This mould that contains the rib-loop duct is installed in the hydraulic press.
Processing step is as follows:
Make poly-(L-lactic acid) screw prefabricated component (the concrete numerical value of each example sees Table 2) by above-mentioned technology;
At first set the rib-loop forming temperature during beginning, treat mould be warmed up to design temperature and stable after, prefabricated component is put into the mould base chamber of rib-loop mould;
The mould base is put into beginning upper die and lower die matched moulds after 1 minute, and matched moulds finishes fully in 5 second time;
Keep-up pressure and cut off thermal source, the cooling of water flowing immediately, the greenhouse cooling that made mould in 2 minutes is to (being lower than the T of poly-(L-lactic acid) to 50 ℃
g);
When mold temperature was lower than 40 ℃, finished product was taken out in the pressure relief die sinking.
Obtain poly-(L-lactic acid) screw of M4.2 * 1.5, long 50mm.Related parameter is arranged and the results are shown in Table 3.
Table 3
| Embodiment | Rod forging and pressing temperature/℃ | Mould base size (thick * length * height)/mm | Mould base deformation ratio | Screw bending strength/MPa | Screw shear strength/MPa |
| 9 | 115 | 4×15×21 | 6.7 | 272±20 | 167±17 |
| 10 | 115 | 4×21×15 | 4.8 | 265±21 | 163±18 |
| 11 | 130 | 4.2×15×22 | 6.7 | 264±22 | 166±17 |
| 12 | 130 | 4.2×22×15 | 4.8 | 255±21 | 164±20 |
Forging Technology embodiment 13～16
Requiring finished product is poly-(L-lactic acid) pole of φ 3.5mm, long 100mm, adopting the mould base chamber of mould embodiment 3 is the directed forge die of transverse design, directed deformation chamber horizontal length is 100mm, mould base chamber is in center, directed deformation chamber, and the directed duct that constitutes during the upper die and lower die matched moulds is the cavity of diameter 3.5mm, long 100mm; Mould is installed in the hydraulic press.
Processing step is as follows:
To gather (L-lactic acid) is molded into sheet material with common die pressing and cuts out to cut again and make the rectangular mold base (the concrete numerical value of each example see Table 4) of deformation ratio between 14～25;
At first set the forging and pressing temperature during beginning, treat mould embodiment 3 be warmed up to design temperature and stable after, put the mould base into mould base chamber;
The mould base is put into beginning upper die and lower die matched moulds forging and pressing after 1 minute, and matched moulds finishes fully in 5 second time;
Keep-up pressure and cut off thermal source, the cooling of water flowing immediately, the greenhouse cooling that made mould in 2 minutes is to (being lower than the T of poly-(L-lactic acid) to 50 ℃
g);
When mold temperature was lower than 40 ℃, finished product was taken out in the pressure relief die sinking.
Obtain poly-(L-lactic acid) pole of φ 3.5mm, long 100mm.Related parameter is arranged and the results are shown in Table 4.
Table 4
| Embodiment | The forging and pressing temperature/℃ | Mould base size (thick * length * height)/mm | Mould base deformation ratio | Bending strength/MPa (line-of-sight course) | Shear strength/MPa |
| 13 | 115 | 3.5×15×21 | 6.7 | 255±20 | 166±16 |
| 14 | 115 | 3.5×15×21 | 4.8 | 251±21 | 165±18 |
| 15 | 130 | 3.5×15×21 | 7.9 | 242±22 | 165±18 |
| 16 | 130 | 3.5×21×15 | 5.0 | 238±23 | 164±18 |
Forging Technology embodiment 17～18
The requirement finished product is 2 * 20 * 50mm
3Poly-(L-lactic acid) reinforcement plate, the mould base chamber of adopting mould embodiment 1 is the directed forge die that vertically designs, directed deformation chamber horizontal length is 120mm, becomes the cavity of the peripheral directed duct that constitutes, chamber into 120mm, wide 20mm, high 2mm with setting during the upper die and lower die matched moulds; Mould is installed in the hydraulic press.
Processing step is as follows:
To gather (L-lactic acid) is molded into sheet material with common die pressing and cuts out and cut that to make deformation ratio be 10 rectangular mold base (the concrete numerical value of each example sees Table 5);
At first set the forging and pressing temperature during beginning, treat mould be warmed up to design temperature and stable after, put the mould base in the directed deformation chamber mould base chamber;
The mould base is put into beginning upper die and lower die matched moulds forging and pressing after 2 minutes, and matched moulds finishes fully in 10 second time;
Keep-up pressure and stop heating, water flowing immediately cooling, the greenhouse cooling that made mould in 2 minutes is to (being lower than the T of poly-(L-lactic acid) to 50 ℃
g);
When mold temperature was lower than 40 ℃, finished product was taken out in the pressure relief die sinking.
Obtain 2 * 20 * 120mm
3Poly-(L-lactic acid) reinforcement plate.The two ends of slave plate plant out the plate of long 50mm to the centre respectively.Related parameter is arranged and the results are shown in following table 5.
Table 5
| Embodiment | Forge the pressure temperature/℃ | Mould base size (length * wide * height)/mm | Mould base deformation ratio | Bending strength/MPa (line-of-sight course) | Shear strength/MPa |
| 17 | 110 | 12×20×20 | 10 | 245 | 165 |
| 18 | 130 | 15×20×20 | 10 | 238 | 164 |
Claims (9)
1. one kind is exclusively used in the directed forge die that poly-(L-lactic acid) material forges and presses, it is characterized in that: form by main body and upper die and lower die, main body contains the directed deformation chamber about connecting, the size of upper die and lower die cross section is consistent with the cross section in directed deformation chamber with shaped design, after upper die and lower die inject matched moulds from the directed deformation chamber upper and lower of main body respectively, constitute the directed deformation duct cavity that equals shape of product by the periphery in patrix lower surface, counterdie upper surface and directed deformation chamber.
2. directed forge die according to claim 1 is characterized in that: center, described directed deformation chamber has mould base chamber, and its shape is consistent with the mould base with size, and surface, mould base chamber is an arc transition with intersection, surface, directed deformation chamber.
3. directed forge die according to claim 2 is characterized in that: the radius of surface, described mould base chamber and intersection, surface, directed deformation chamber arc transition is at 3～8mm.
4. directed forge die according to claim 2 is characterized in that: described mould base chamber is consistent with directed deformation cavity direction.
5. directed forge die according to claim 2 is characterized in that: described mould base chamber is and vertical rectangular hole, directed deformation chamber.
6. directed forge die according to claim 2 is characterized in that: described mould base chamber is and the vertical circular hole in directed deformation chamber.
7. according to the described directed forge die of claim 1 to 6, it is characterized in that: have cooling-water duct, electrical bar jack and thermometer hole in the described main body, external respectively cooling water, be inserted with electrical bar, thermo detector.
8. the Forging Technology that is exclusively used in the directed forge die of poly-(L-lactic acid) material forging and pressing according to claim 1, step is as follows:
A, the mould base put into the mould base chamber of the special-purpose directed forge die of temperature between 110 ℃ to 115 ℃;
B, mould base are put into beginning upper die and lower die matched moulds forging and pressing after 1～2 minute, and time restriction is in 3～30 seconds;
C, matched moulds keep-up pressure and stop heating to the precalculated position, cool off immediately, require in 2 minutes the temperature in mould base chamber is brought down below 50 ℃;
D, when mold temperature is lower than 40 ℃, finished product is taken out in the pressure relief die sinking.
9. the Forging Technology of poly-(L-lactic acid) material according to claim 8 is characterized in that: described mould base is put into beginning upper die and lower die matched moulds forging and pressing after 1～2 minute, and time restriction is in 5～10 seconds.
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| CN101973125B (en) * | 2010-10-22 | 2012-12-12 | 中国科学院长春应用化学研究所 | Mould and method for manufacturing fracture internal fixation member |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1394654A (en) * | 2002-07-10 | 2003-02-05 | 浙江大学 | Polylactic acid porous scaffold for tissue engineering and its preparation method |
| WO2003057781A1 (en) * | 2001-12-28 | 2003-07-17 | Asahi Denka Co., Ltd. | Polylactic acid-based resin compositions, molded articles and process for producing the same |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2003057781A1 (en) * | 2001-12-28 | 2003-07-17 | Asahi Denka Co., Ltd. | Polylactic acid-based resin compositions, molded articles and process for producing the same |
| CN1394654A (en) * | 2002-07-10 | 2003-02-05 | 浙江大学 | Polylactic acid porous scaffold for tissue engineering and its preparation method |
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