CN113799331A - Injection mold with automatic stub bar cutting function - Google Patents
Injection mold with automatic stub bar cutting function Download PDFInfo
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- CN113799331A CN113799331A CN202111055035.1A CN202111055035A CN113799331A CN 113799331 A CN113799331 A CN 113799331A CN 202111055035 A CN202111055035 A CN 202111055035A CN 113799331 A CN113799331 A CN 113799331A
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- Prior art keywords
- pulling rod
- material pulling
- plate
- fixing plate
- top plate
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/26—Moulds
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/26—Moulds
- B29C45/2602—Mould construction elements
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/38—Cutting-off equipment for sprues or ingates
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/40—Removing or ejecting moulded articles
- B29C45/4005—Ejector constructions; Ejector operating mechanisms
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
The invention discloses an injection mold with an automatic material cutting head function, which comprises a bottom plate, mold feet, an ejector pin fixing plate, a top plate, a material pulling rod and a movable mold plate for injection molding of a workpiece, wherein the mold feet are fixed on the bottom plate, the movable mold plate is fixed on the mold feet, and the top plate is fixed on the ejector pin fixing plate; a plurality of thimbles are fixed on the thimble fixing plate, and the upper end of each thimble movably penetrates through the top plate and then extends into the movable template; the movable template is provided with a flow passage and a feed inlet communicated with the flow passage; the upper end of the material pulling rod extends into the flow channel, the upper end of the material pulling rod is provided with a barb, the lower end of the material pulling rod movably penetrates through the top plate and the thimble fixing plate and then abuts against the bottom plate, a time delay mechanism is arranged between the material pulling rod and the thimble fixing plate, and an elastic mechanism is arranged between the material pulling rod and the top plate; according to the invention, after the workpiece is formed by injection molding, in the process of demoulding the workpiece, the stub bar on the workpiece can be automatically cut off.
Description
Technical Field
The invention relates to the technical field of injection molds, in particular to an injection mold with an automatic stub bar cutting function.
Background
At present, after the injection mold on the market forms a workpiece through injection molding, a stub bar formed in the injection molding process can be remained on the workpiece, and the stub bar on the workpiece is removed by manually holding a cutter.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides the injection mold with the automatic stub bar cutting function, after a workpiece is formed by injection molding, the stub bar on the workpiece can be automatically cut off in the workpiece demolding process, so that the stub bar on the workpiece is not required to be manually cut off, the labor intensity of workers can be reduced, the labor cost can be reduced, and the production efficiency of the workpiece can be improved.
The injection mold with the automatic cutting head function comprises a bottom plate, mold feet, an ejector pin fixing plate, a top plate, a material pulling rod and a movable mold plate for injection molding of a workpiece, wherein the mold feet are fixed on the bottom plate, the movable mold plate is fixed on the mold feet, the top plate and the ejector pin fixing plate are sequentially arranged between the movable mold plate and the bottom plate from top to bottom, and the top plate is fixed on the ejector pin fixing plate; a plurality of thimbles which are used for ejecting the workpiece from the driven template when the thimble fixing plate moves upwards are fixed on the thimble fixing plate, and the upper end of each thimble movably penetrates through the top plate and then extends into the driven template; the movable mould plate is provided with a runner and a feed inlet communicated with the runner, when raw materials enter the runner through the feed inlet, the raw materials form a stub bar in the runner, and a sprue is formed between the stub bar and an injection-molded workpiece; the upper end of the material pulling rod extends into the flow channel, a barb used for being hooked with the stub bar is arranged at the upper end of the material pulling rod, the lower end of the material pulling rod movably penetrates through the top plate and the ejector pin fixing plate and then abuts against the bottom plate, a time delay mechanism which drives the material pulling rod to move upwards in a time delay mode when the ejector pin fixing plate moves upwards is arranged between the material pulling rod and the ejector pin fixing plate, an elastic mechanism is arranged between the material pulling rod and the top plate, and the elastic mechanism is used for applying an elastic trend of moving downwards to the material pulling rod.
The invention discloses an injection mold with an automatic blanking head function, wherein a delay mechanism comprises an annular boss arranged on the peripheral wall of a material pulling rod, the annular boss is positioned between a top plate and an ejector pin fixing plate, and a groove for sliding in the annular boss when the ejector pin fixing plate moves upwards is arranged on the upper end surface of the ejector pin fixing plate; after the time delay mechanism is adopted, when the ejector fixing plate moves upwards under the driving of the injection molding machine, the ejector fixing plate can push the ejector pins to move upwards, meanwhile, the annular bosses can firstly slide into the grooves, and in the process that the ejector fixing plate continuously moves upwards, the material pulling rod can be pushed by the ejector fixing plate and moves upwards, namely, the ejector pins can move upwards in advance of the material pulling rod, so that the purpose of the material pulling rod moving upwards in a time delay mode is achieved.
The injection mold with the automatic blanking head function comprises an elastic mechanism, a material pulling rod and a top plate, wherein the elastic mechanism comprises an elastic piece sleeved outside the material pulling rod above an annular boss; after adopting this kind of elastic mechanism, when thimble fixed plate has not promoted the material pulling rod yet, the elastic component can exert decurrent elasticity trend to annular boss to the phenomenon that the material pulling rod was driven and the rebound appears when annular boss on avoiding the material pulling rod has not leaned on with the bottom of recess.
The injection mold with the automatic material cutting head function, disclosed by the invention, is characterized in that the elastic part is a spring; after the spring is used as the elastic piece, the elastic piece has the advantages of simple structure and low cost.
The injection mold with the automatic cutting head function is characterized in that a circumferential limiting structure is arranged between the material pulling rod and the top plate and used for limiting the material pulling rod to rotate relative to the top plate; through limit structure's setting, at thimble fixed plate, roof and the in-process that draws the material pole to remove, can avoid drawing the material pole the relative thimble fixed plate and roof circumferential direction's phenomenon appear, can avoid being located the barb that draws the material pole upper end the phenomenon of dislocation appears.
The injection mold with the automatic blanking head function comprises a circumferential limiting structure, wherein the circumferential limiting structure comprises a limiting pin fixed on the outer wall of an annular boss, and a limiting groove for the insertion of the limiting pin and the sliding of the limiting pin when the ejector pin fixing plate moves upwards is formed in the side wall of a concave cavity; after the circumferential limiting structure is adopted, the phenomenon that the material pulling rod rotates circumferentially relative to the ejector pin fixing plate and the top plate can be effectively avoided.
The injection mold with the automatic material cutting head function is characterized in that the side wall of the annular boss is provided with a pin hole, and one end, facing the annular boss, of the limiting pin is inserted into the pin hole and is tightly matched with the pin hole; by adopting the structure, the limiting pin can be reliably and conveniently assembled with the annular boss.
According to the injection mold with the automatic blanking head function, when the thimble fixing plate moves to the lower limit position, the distance between the lower end face of the annular boss and the inner bottom of the groove is 7 mm; when the ejector pin fixing plate moves to the lower limit position, namely the ejector pin fixing plate is in the initial position, the delay requirement of upward movement of the material pulling rod can be met by adopting the distance.
According to the invention, after the workpiece is formed by injection molding, the stub bar on the workpiece can be automatically cut off in the workpiece demolding process, so that the stub bar on the workpiece is not required to be manually cut off, the labor intensity of workers can be reduced, the labor cost can be reduced, and the production efficiency of the workpiece can be improved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:
FIG. 1 is a schematic perspective view of the present invention;
FIG. 2 is an enlarged view of the structure at A in FIG. 1;
FIG. 3 is a schematic view of the present invention in partial cross-section;
FIG. 4 is an enlarged view of the structure at B in FIG. 3;
fig. 5 is an enlarged schematic view of the structure at C in fig. 3.
Detailed Description
In the following description, for purposes of explanation, numerous implementation details are set forth in order to provide a thorough understanding of the various embodiments of the present invention. It should be understood, however, that these implementation details are not to be interpreted as limiting the invention. That is, in some embodiments of the invention, such implementation details are not necessary. In addition, some conventional structures and components are shown in simplified schematic form in the drawings.
In addition, the descriptions related to the first, the second, etc. in the present invention are only used for description purposes, do not particularly refer to an order or sequence, and do not limit the present invention, but only distinguish components or operations described in the same technical terms, and are not understood to indicate or imply relative importance or implicitly indicate the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
The injection mold with the automatic material cutting head function comprises a bottom plate 1, a mold foot 11, an ejector pin fixing plate 2, a top plate 3, a material pulling rod 4 and a movable mold plate 6 for injection molding of a workpiece 5, wherein the mold foot 11 is fixed on the bottom plate 1, the movable mold plate 6 is fixed on the mold foot 11, the top plate 3 and the ejector pin fixing plate 2 are sequentially arranged between the movable mold plate 6 and the bottom plate 1 from top to bottom, and the top plate 3 is fixed on the ejector pin fixing plate 2; a plurality of thimbles 21 which are used for ejecting the workpiece 5 from the movable template 6 when the thimble fixing plate 2 moves upwards are fixed on the thimble fixing plate 2, and the upper end of each thimble 21 movably penetrates through the top plate 3 and then extends into the movable template 6; the movable die plate 6 is provided with a runner 61 and a feed inlet 62 communicated with the runner 61, when raw materials enter the runner 61 through the feed inlet 62, the raw materials form a stub bar 51 in the runner 61, and a sprue 52 is formed between the stub bar 51 and the injection-molded workpiece 5; the upper end of the material pulling rod 4 extends into the flow channel 61, the upper end of the material pulling rod 4 is provided with a barb 41 used for hooking with the stub bar 51, the lower end of the material pulling rod 4 movably penetrates through the top plate 3 and the thimble fixing plate 2 and then abuts against the bottom plate 1, a delay mechanism used for driving the material pulling rod 4 to move upwards in a delayed manner when the thimble fixing plate 2 moves upwards is arranged between the material pulling rod 4 and the thimble fixing plate 2, an elastic mechanism is arranged between the material pulling rod 4 and the top plate 3 and used for applying an elastic trend of downward movement to the material pulling rod 4.
The time delay mechanism comprises an annular boss 42 arranged on the outer peripheral wall of the material pulling rod 4, the annular boss 42 is positioned between the top plate 3 and the thimble fixing plate 2, and a groove 22 for sliding the annular boss 42 partially when the thimble fixing plate 2 moves upwards is arranged on the upper end surface of the thimble fixing plate 2; after the time delay mechanism is adopted, when the ejector fixing plate moves upwards under the driving of the injection molding machine, the ejector fixing plate can push the ejector pins to move upwards, meanwhile, the annular bosses can firstly slide into the grooves, and in the process that the ejector fixing plate continuously moves upwards, the material pulling rod can be pushed by the ejector fixing plate and moves upwards, namely, the ejector pins can move upwards in advance of the material pulling rod, so that the purpose of the material pulling rod moving upwards in a time delay mode is achieved.
The elastic mechanism comprises an elastic part 7 sleeved outside the material pulling rod 4 positioned above the annular boss 42, a concave cavity 31 used for accommodating the elastic part 7 and for allowing the annular boss 42 to slide in is arranged in the top plate 3, the upper end of the elastic part 7 is abutted against the upper end of the concave cavity 31, and the lower end of the elastic part 7 is abutted against the upper end of the annular boss 42; after adopting this kind of elastic mechanism, when thimble fixed plate has not promoted the material pulling rod yet, the elastic component can exert decurrent elasticity trend to annular boss to the phenomenon that the material pulling rod was driven and the rebound appears when annular boss on avoiding the material pulling rod has not leaned on with the bottom of recess.
The elastic piece 7 is a spring; after the spring is used as the elastic piece, the elastic piece has the advantages of simple structure and low cost.
A circumferential limiting structure is arranged between the material pulling rod 4 and the top plate 3 and is used for limiting the material pulling rod 4 to rotate relative to the top plate 3; through limit structure's setting, at thimble fixed plate, roof and the in-process that draws the material pole to remove, can avoid drawing the material pole the relative thimble fixed plate and roof circumferential direction's phenomenon appear, can avoid being located the barb that draws the material pole upper end the phenomenon of dislocation appears.
The circumferential limiting structure comprises a limiting pin 43 fixed on the outer wall of the annular boss 42, and a limiting groove 32 for the limiting pin 43 to insert and for the limiting pin 43 to slide when the thimble fixing plate 2 moves upwards is arranged on the side wall of the concave cavity 31; after the circumferential limiting structure is adopted, the phenomenon that the material pulling rod rotates circumferentially relative to the ejector pin fixing plate and the top plate can be effectively avoided.
A pin hole 44 is formed in the side wall of the annular boss 42, and one end, facing the annular boss 42, of the limiting pin 43 is inserted into the pin hole 44 and is tightly matched with the pin hole 44; by adopting the structure, the limiting pin can be reliably and conveniently assembled with the annular boss.
When the thimble fixing plate 2 moves to the lower limit position, the distance between the lower end surface of the annular boss 42 and the inner bottom of the groove 22 is 7 mm; when the ejector pin fixing plate moves to the lower limit position, namely the ejector pin fixing plate is in the initial position, the delay requirement of upward movement of the material pulling rod can be met by adopting the distance.
The bottom plate is fixed on an injection molding machine, and the thimble fixing plate is driven by the injection molding machine; when the injection molding is carried out, raw materials enter the flow passage from the feeding hole, the raw materials entering the flow passage enter an injection molding cavity of an injection mold and are subjected to injection molding to form a workpiece, when the injection molding of the workpiece is finished and the demolding is required, the injection molding machine firstly drives the ejector pin fixing plate to move upwards for a certain distance (because a delay mechanism is arranged between the material pulling rod and the ejector pin fixing plate, the material pulling rod cannot move upwards at the moment, and the certain distance is 7mm), after the ejector pin fixing plate moves upwards for a certain distance (the certain distance is 7mm), the ejector pin fixing plate drives the ejector pin to move upwards for a certain distance (the certain distance is 7mm), the workpiece on the movable mold plate is pre-ejected after the ejector pin moves upwards for a certain distance, and in the process that the workpiece is pre-ejected, because a stub bar positioned in the flow passage is in a clamping state with a barb positioned on the material pulling rod and the material pulling rod does not move, therefore, the workpiece and the stub bar are broken at the sprue, and the purpose of automatically cutting the stub bar by the workpiece is achieved; then, the injection molding machine can continuously drive the ejector pin to move upwards (at the moment, the annular boss on the material pulling rod and the bottom of the groove on the ejector pin fixing plate are in a state of abutting against each other), in the process that the ejector pin fixing plate continuously moves upwards, the ejector pin can completely eject the workpiece on the movable template from the movable template, the stub bar in the flow channel can be ejected from the flow channel by the material pulling rod, and finally, the injection molding machine drives the ejector pin fixing plate to move downwards to reset.
The above description is only an embodiment of the present invention, and is not intended to limit the present invention. Various modifications and alterations to this invention will become apparent to those skilled in the art. Any modification, equivalent replacement, improvement or the like made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.
Claims (8)
1. The utility model provides an injection mold with automatic blank head function which characterized in that: the injection molding die comprises a bottom plate (1), die feet (11), an ejector pin fixing plate (2), a top plate (3), a material pulling rod (4) and a movable die plate (6) used for injection molding of a workpiece (5), wherein the die feet (11) are fixed on the bottom plate (1), the movable die plate (6) is fixed on the die feet (11), the top plate (3) and the ejector pin fixing plate (2) are sequentially arranged between the movable die plate (6) and the bottom plate (1) from top to bottom, and the top plate (3) is fixed on the ejector pin fixing plate (2); a plurality of thimbles (21) which are used for ejecting a workpiece (5) from the movable template (6) when the thimble fixing plate (2) moves upwards are fixed on the thimble fixing plate (2), and the upper end of each thimble (21) movably penetrates through the top plate (3) and then extends into the movable template (6); the movable die plate (6) is internally provided with a flow channel (61) and a feed inlet (62) communicated with the flow channel (61), when raw materials enter the flow channel (61) through the feed inlet (62), the raw materials form a stub bar (51) in the flow channel (61), and a sprue (52) is formed between the stub bar (51) and an injection-molded workpiece (5); the material pulling device is characterized in that the upper end of the material pulling rod (4) extends into a flow channel (61), an barb (41) used for hooking with a material head (51) is arranged at the upper end of the material pulling rod (4), the lower end of the material pulling rod (4) movably penetrates through a top plate (3) and a thimble fixing plate (2) and then is abutted against a bottom plate (1), a time delay mechanism which drives the material pulling rod (4) to move upwards in a time delay manner when the thimble fixing plate (2) moves upwards is arranged between the material pulling rod (4) and the thimble fixing plate (2), an elastic mechanism is arranged between the material pulling rod (4) and the top plate (3), and the elastic mechanism is used for applying the elastic tendency of downward movement to the material pulling rod (4).
2. The injection mold with the automatic blanking head function according to claim 1, wherein the time delay mechanism comprises an annular boss (42) arranged on the peripheral wall of the material pulling rod (4), the annular boss (42) is located between the top plate (3) and the thimble fixing plate (2), and a groove (22) for sliding in the annular boss (42) partially is arranged on the upper end surface of the thimble fixing plate (2) when the thimble fixing plate (2) moves upwards.
3. The injection mold with the function of the automatic blanking head as claimed in claim 2, wherein the elastic mechanism comprises an elastic member (7) sleeved outside the material pulling rod (4) located above the annular boss (42), a cavity (31) used for accommodating the elastic member (7) and for allowing the annular boss (42) to slide in is arranged in the top plate (3), the upper end of the elastic member (7) abuts against the upper end of the cavity (31), and the lower end of the elastic member (7) abuts against the upper end of the annular boss (42).
4. An injection mould with automatic blanking head function according to claim 3, characterized in that the elastic member (7) is a spring.
5. An injection mold with an automatic blanking head function according to claim 3, characterized in that a circumferential limiting structure is arranged between the material pulling rod (4) and the top plate (3), and the circumferential limiting structure is used for limiting the rotation of the material pulling rod (4) relative to the top plate (3).
6. The injection mold with the function of the automatic blanking head as claimed in claim 5, wherein the circumferential limiting structure comprises a limiting pin (43) fixed on the outer wall of the annular boss (42), and a limiting groove (32) for inserting the limiting pin (43) and for sliding the limiting pin (43) when the ejector fixing plate (2) moves upwards is arranged on the side wall of the cavity (31).
7. The injection mold with the automatic blanking head function according to claim 6, wherein a pin hole (44) is formed in a side wall of the annular boss (42), and the limit pin (43) is inserted into the pin hole (44) towards one end of the annular boss (42) and is tightly matched with the pin hole (44).
8. The injection mold with the automatic blanking head function according to claim 2, wherein when the thimble fixing plate (2) moves to the lower limit position, a distance between a lower end surface of the annular boss (42) and an inner bottom of the groove (22) is 7 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111055035.1A CN113799331A (en) | 2021-09-09 | 2021-09-09 | Injection mold with automatic stub bar cutting function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111055035.1A CN113799331A (en) | 2021-09-09 | 2021-09-09 | Injection mold with automatic stub bar cutting function |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113799331A true CN113799331A (en) | 2021-12-17 |
Family
ID=78894975
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111055035.1A Pending CN113799331A (en) | 2021-09-09 | 2021-09-09 | Injection mold with automatic stub bar cutting function |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113799331A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN205522350U (en) * | 2016-04-20 | 2016-08-31 | 浙江赛豪实业有限公司 | Forming die's ejection mechanism |
| CN108127874A (en) * | 2018-01-15 | 2018-06-08 | 青岛海泰科模具有限公司 | One kind is from dynamic circuit breaker cast gate injection mold |
| CN209955196U (en) * | 2019-05-28 | 2020-01-17 | 青岛汉普森智能科技有限公司 | Injection mold with time delay ejection mechanism |
| CN211683302U (en) * | 2019-12-09 | 2020-10-16 | 苏州中悦百毅光电科研开发有限公司 | Injection mold with automatic side gate cutting function |
-
2021
- 2021-09-09 CN CN202111055035.1A patent/CN113799331A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN205522350U (en) * | 2016-04-20 | 2016-08-31 | 浙江赛豪实业有限公司 | Forming die's ejection mechanism |
| CN108127874A (en) * | 2018-01-15 | 2018-06-08 | 青岛海泰科模具有限公司 | One kind is from dynamic circuit breaker cast gate injection mold |
| CN209955196U (en) * | 2019-05-28 | 2020-01-17 | 青岛汉普森智能科技有限公司 | Injection mold with time delay ejection mechanism |
| CN211683302U (en) * | 2019-12-09 | 2020-10-16 | 苏州中悦百毅光电科研开发有限公司 | Injection mold with automatic side gate cutting function |
Non-Patent Citations (1)
| Title |
|---|
| 刘峥: "《塑料成型工艺及模具——设计与实践》", 30 November 2013, 重庆大学出版社 * |
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Application publication date: 20211217 |