CN112917988B - Non-uniform pressure control method for composite viscous medium - Google Patents
Non-uniform pressure control method for composite viscous medium Download PDFInfo
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- CN112917988B CN112917988B CN202110185165.0A CN202110185165A CN112917988B CN 112917988 B CN112917988 B CN 112917988B CN 202110185165 A CN202110185165 A CN 202110185165A CN 112917988 B CN112917988 B CN 112917988B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
- B30B15/02—Dies; Inserts therefor; Mounting thereof; Moulds
Abstract
The invention relates to a method for controlling the non-uniform pressure of a composite viscous medium, which comprises the following steps: manufacturing a section die with a cavity with the same shape according to the structure of a required part, and correspondingly modifying the number and distribution of injection channels in the medium bin; respectively filling viscous media with different molecular weights into different injection channels in the media bin according to the structural characteristics of the part, and mounting a plunger in the injection channels; III, placing the plate blank material between a section mould and a medium bin and clamping the section mould and the medium bin; and IV, setting the loading speed of the plunger in each injection channel, and starting a press machine to enable the plunger to load the viscous medium in each injection channel at the respective set loading speed, so that each position of the plate blank can be tightly attached to the section die.
Description
Technical Field
The invention relates to the technical field of viscous medium forming, in particular to a method for controlling the non-uniform pressure of a composite viscous medium.
Background
Complex curved surface thin-wall components, such as an aircraft engine flame tube, a heat shield and the like, generally have structural characteristics of local sudden change, thin wall, special-shaped section and the like, and bring difficulty to stamping forming of the complex curved surface thin-wall components.
In order to accurately control the distribution state of the material in different areas, the forming pressure needs to be non-uniformly distributed in different areas according to the difference of the part structure, so that the complex curved surface part with uniform wall thickness distribution and high shape and size precision is obtained. The viscous medium pressure forming can form non-uniform pressure in forming because the adopted viscous medium has strain rate sensitivity, and the part with larger local difference of structure can not meet the forming requirement only by the non-uniform pressure of the viscous medium, so a new process method needs to be developed.
Therefore, in view of the above disadvantages, it is desirable to provide a method for non-uniform pressure control of a composite viscous medium.
Disclosure of Invention
Technical problem to be solved
The invention aims to solve the technical problem that the existing forming process of viscous media cannot process parts with large local difference in structure.
(II) technical scheme
In order to solve the technical problem, the invention provides a method for controlling the non-uniform pressure of a composite viscous medium, which comprises the following steps,
manufacturing a section die with a cavity with the same shape according to the structure of a required part, and correspondingly modifying the number and distribution of injection channels in the medium bin;
respectively filling viscous media with different molecular weights into different injection channels in the media bin according to the structural characteristics of the part, and mounting a plunger in the injection channels;
III, placing the plate blank material between a section mould and a medium bin and clamping the section mould and the medium bin;
and IV, setting the loading speed of the plunger in each injection channel, and starting a press machine to enable the plunger to load the viscous medium in each injection channel at the respective set loading speed, so that each position of the plate blank can be tightly attached to the section mould.
By adopting the technical scheme, various viscous media are selected according to the characteristics of parts to be formed, and the viscous media are arranged in one-to-one correspondence with the regions with large local differences of part structures, so that the plate can be subjected to different local forming pressures, the pressures of different deformation regions are non-uniformly distributed, meanwhile, the sequence of deformation of the plate is controlled by regulating and controlling the injection speed, the material flow and material distribution can be fully controlled, the local complex structure is promoted to be fully filled, the local thinning is avoided, the forming effect of the plate parts with large local differences on the final structure is better, and the qualification rate is greatly improved.
As a further explanation of the present invention, it is preferable that the number of the injection channels is the same as the number of the deformation regions of different deformation degrees in the cavity, and the distribution positions of the injection channels correspond to the positions of the different deformation regions in the cavity.
By adopting the technical scheme, different viscous media can flow into the corresponding cavities, so that the plate can be formed in a targeted manner, and the problem that the plate is locally thinned or cracked due to over-stretching is effectively avoided.
As a further explanation of the present invention, it is preferable that a large deformation degree of the cavity deformation region corresponds to a large molecular weight of the viscous medium in the injection passage, and a small deformation degree of the cavity deformation region corresponds to a small molecular weight of the viscous medium in the injection passage.
By adopting the technical scheme, the viscous medium with high molecular weight has larger uneven pressure distribution in the loading process, and compared with the viscous medium with low molecular weight, the viscous medium with high molecular weight is used in a region with large deformation degree, the plunger loading amount can be obviously reduced, and the energy is effectively saved; in addition, the viscous medium with small molecular weight is used in the region with small deformation degree, so that excessive deformation of the plate can be avoided, and meanwhile, the friction force of the contact interface between the plate and the forming die when the plate is firstly attached to the die in the region with small deformation degree is reduced, and the flowing filling of the plate to the region with large deformation degree is facilitated.
As a further illustration of the present invention, it is preferred that the viscous medium is a high molecular weight polymer and the viscous medium has a molecular weight of 100kg/mol to 900 kg/mol.
By adopting the technical scheme, the viscous medium in the range can carry out plastic forming on various plates in the practical application process, the plate forming does not generate resilience, the size precision is high, and the pressure and the loading speed of the plunger piston can be transmitted to the plate almost without loss.
As a further explanation of the present invention, it is preferable that a large deformation degree of the cavity deformation region increases a loading speed of the viscous medium in the corresponding injection passage, and a small deformation degree of the cavity deformation region decreases a loading speed of the viscous medium in the corresponding injection passage.
Through adopting above-mentioned technical scheme, set up big loading speed in the region that the degree of deformation is big, can make panel be the preferential deformation in this region, the material is to this regional flow supplement, viscous medium deformation speed is fast then inhomogeneous pressure effect is more showing simultaneously, be favorable to forming the local structure that the degree of deformation is big, set up little loading speed in the part that the deformation region is little in addition, can not only cooperate the regional preferential formation that the degree of deformation is big, can avoid again around the little region of the degree of deformation of panel because of the problem that great loading speed stretch attenuation or by the stretch-break.
(III) advantageous effects
The technical scheme of the invention has the following advantages:
the invention loads viscous media with different molecular weights to different deformation areas through the plurality of medium bin injection channels, compared with the forming of the viscous media with single molecular weight, the invention can combine the viscous media with various molecular weights according to the structural characteristics of parts, obtains better and remarkable non-uniform pressure effect, and effectively solves the problem that plate parts with larger local difference of the structure are difficult to form.
Drawings
FIG. 1 is a diagram of the initial state of deformation of the present invention;
FIG. 2 is a diagram illustrating an initial state of deformation of the present invention;
FIG. 3 is a state diagram of the late stage of the deformation of the present invention;
fig. 4 is a diagram of a deformation completion state of the present invention.
In the figure: 1. forming a mould; 11. a cavity; 2. a media hopper; 21. an injection channel; 22. a plunger; 3. a sheet blank; 4. a viscous medium; 41. a first medium; 42. a second medium; 43. a third medium; 44. a fourth medium.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
A method for controlling the non-uniform pressure of a composite viscous medium, which is combined with the figures 1-4, and comprises the following steps:
i, manufacturing a pattern die 1 with a cavity 11 with the same shape according to the structure of a required part, and correspondingly modifying the number and distribution of injection channels 21 in a medium bin 2;
II, respectively filling viscous media 4 with different molecular weights into different injection channels 21 in the media bin 2 according to the structural characteristics of the part, and installing plungers 22 in the injection channels 21;
III, placing the plate blank 3 between the section mould 1 and the medium bin 2 and clamping the section mould 1 and the medium bin 2;
and IV, setting the loading speed of the plunger 22 in each injection channel 21, and starting the press to enable the plunger 22 to load the viscous medium 4 in each injection channel 21 at the respectively set loading speed, so that each position of the plate blank 3 can be tightly attached to the mould 1.
The cavity 11 in the pattern die 1 has the characteristics of different structural depths, different lengths and widths and mutual communication, the medium bin 2 is a shell with a plurality of injection channels 21 arranged in the middle, the number of the injection channels 21 is the same as that of deformation areas with different deformation degrees in the cavity 11, and the distribution positions of the injection channels 21 correspond to the positions of the different deformation areas in the cavity 11, so that different viscous media 4 flow into the corresponding cavities 11, and further the plate blank 3 is formed in a targeted manner, thereby effectively avoiding the problem that the plate blank 3 is excessively stretched to cause local thinning or cracking.
The present invention also provides another configuration of the media cartridge 2 (not shown in the figures): the medium bin 2 is internally provided with a square groove with a larger volume, square upright posts with different lengths and widths are placed in the groove, the middle parts of some upright posts are provided with injection channels 21, the sizes of the injection channels 21 of the upright posts with the same length, width and height are the same, and some upright posts are solid square bodies. The upright columns with the injection passages 21 with proper sizes can be found out by analyzing the structures of the cavities 11 in different moulds 1, the solid upright columns are combined, the arrangement of the upright columns is carried out according to the change range of the structures of the cavities 11, then the assembled upright columns are inserted into the square grooves, the solid upright columns are inserted into the areas with gaps for filling, and the viscous medium 4 is ensured not to flow back to the gaps among the upright columns from the moulds 11. Adopt above-mentioned medium storehouse 2 structure, can arrange out corresponding injection channel 21 distribution structure according to the die cavity 11 structure, need not additionally to make medium storehouse 2 again, can not only guarantee that board blank 3 is shaping smoothly, can also reduce the quantity in medium storehouse 2, reduce the parking space in medium storehouse 2, practice thrift the warehouse space.
The viscous medium 4 is a high molecular polymer, the molecular weight of the viscous medium 4 is between 100kg/mol and 900kg/mol, and the viscous medium 4 in the range can carry out plastic forming on various plates in the practical application process, can ensure that the plates have no rebound resilience and rebound and have high dimensional accuracy, and simultaneously can ensure that the pressure and the loading speed of the plunger 22 can be transmitted to the plates almost without loss. In addition, the viscous medium 4 with different molecular weights is corresponded according to the structure of the cavity 11. The viscous medium 4 in the corresponding injection channel 21 has large molecular weight when the deformation degree of the deformation region of the cavity 11 is large, the viscous medium 4 in the corresponding injection channel 21 has small molecular weight when the deformation degree of the deformation region of the cavity 11 is small, the non-uniform pressure distribution of the viscous medium 4 with large molecular weight is large in the loading process, compared with the viscous medium 4 with small molecular weight, the viscous medium 4 with large molecular weight is used in the region with large deformation degree, the loading amount of the plunger 22 can be obviously reduced, and the energy is effectively saved; in addition, the viscous medium 4 with small molecular weight is used in the area with small deformation degree, so that excessive deformation of the plate can be avoided, and meanwhile, the friction force of the contact interface between the plate and the forming die when the plate is firstly attached to the die in the area with small deformation degree is reduced, and the plate can flow and be filled into the area with large deformation degree.
And, the deformation degree of the deformation region of the die cavity 11 is large, the loading speed of the viscous medium 4 in the corresponding injection channel 21 is large, the deformation degree of the deformation region of the die cavity 11 is small, the loading speed of the viscous medium 4 in the corresponding injection channel 21 is small, the large loading speed is set in the region with large deformation degree of the die cavity 11, the plate can be preferentially deformed in the region, the material flows and supplements to the region, meanwhile, the viscous medium deformation speed is high, the non-uniform pressure effect is more remarkable, the local structure with large deformation degree is favorably formed, in addition, the small loading speed is set in the part with small deformation region, the preferential forming can be matched with the region with large deformation degree, and the problem that the plate is stretched and thinned or broken due to the large loading speed around the region with small deformation degree can be avoided.
With reference to fig. 1-4, the present application provides an embodiment to verify the effectiveness of the above control method. The method comprises the following specific steps:
the mold 1 with the cavity 11 in fig. 1 is selected, and the cavity 11 is analyzed, so that the variation range of four regions can be judged, and therefore, the medium bin 2 with four injection channels 21 is selected, and the viscous mediums 4 with various molecular weights are selected correspondingly, wherein the injection channels 21 from left to right are filled with a first medium 41, a second medium 42, a third medium 43 and a fourth medium 44 respectively, and the variation rule of the cavity 11 from left to right is as follows:
1. the depth is larger, but the depth change towards the right side is slow, and at the moment, the viscous medium 4 with the molecular weight of 300kg/mol is selected as the first medium 41;
2. the depth is the largest but the depth change towards the right side increases sharply, and the second medium 42 is the viscous medium 4 with the molecular weight of 600 kg/mol;
3. the depth is the shallowest but the depth changes greatly to the right, and the third medium 43 is the viscous medium 4 with the molecular weight of 100 kg/mol;
4. the depth is largest but the change in depth to the right increases abruptly, in which case the fourth medium 43 is chosen to be a viscous medium 4 with a molecular weight of 600 kg/mol.
Then, various viscous media 4 are filled into the media bin 2, the plunger 22 is assembled, the plate blank 3 to be processed is placed on the media bin 2, the mould 1 is placed on the plate blank 3, and the mould 1 and the media bin 2 are fixed.
Pressure is then applied to each plunger 22 to cause the plunger 22 to apply different loading rates to different viscous media 4. The loading speed is v from left to right2、v3、v1、v3Wherein v is1<v2<v3。
As shown in fig. 2, at a certain moment in the early stage of deformation, the viscous medium 4 generates a non-uniform pressure distribution on the surface of the slab 3, and the pressures of the four regions from left to right are respectively P2、P3、P1、P3In which P is1<P2<P3. As shown in figure 3, at a certain moment in the later stage of the deformation, the viscous medium 4 generates an uneven pressure distribution on the surface of the slab 3, and the pressure of six areas from left to right is P1′、P2′、P3′、P1′、P3′、P1', wherein P1′<P2′<P3'. As shown in fig. 4, the final blank 3 is fitted tightly to the mould 1 areas. Finally, through measurement, after the plate blank 3 is formed, the thickness error of each part is not more than 0.01mm, the dimension of the formed plate blank 3 is measured through a profile scanner and is led into a computer to be compared with the dimension of the cavity 11 point to point, the dimension error is not more than 3%, and the forming precision and the forming efficiency are extremely high.
In conclusion, various viscous media 4 are selected according to the characteristics of the part to be formed and are arranged in one-to-one correspondence with the regions with large local differences of the part structure, so that the plate can be subjected to different local forming pressures, the pressures of different deformation regions are non-uniformly distributed, meanwhile, the sequence of deformation of the plate is controlled by regulating and controlling the injection speed, the material flow and material distribution can be fully controlled, the local complex structure is fully filled, the local thinning is avoided, the forming effect of the plate part with large local differences in the final structure is better, and the qualification rate is greatly improved.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (3)
1. A method for controlling the non-uniform pressure of a composite viscous medium is characterized in that: comprises the following steps of (a) carrying out,
i, manufacturing a pattern die (1) with a cavity (11) with the same shape according to the structure of a required part, and correspondingly modifying the number and distribution of injection channels (21) in a medium bin (2); the number of the injection channels (21) is the same as the number of deformation areas with different deformation degrees in the cavity (11), and the distribution positions of the injection channels (21) correspond to the positions of the deformation areas in the cavity (11);
II, respectively filling viscous media (4) with different molecular weights into different injection channels (21) in the media bin (2) according to the structural characteristics of the part, and installing a plunger (22) in the injection channels (21); wherein, when the deformation degree of the deformation region of the cavity (11) is large, the molecular weight of the viscous medium (4) in the corresponding injection channel (21) is large, and when the deformation degree of the deformation region of the cavity (11) is small, the molecular weight of the viscous medium (4) in the corresponding injection channel (21) is small;
III, placing the plate blank (3) between the section mould (1) and the medium bin (2) and clamping the section mould (1) and the medium bin (2);
and IV, setting the loading speed of the plunger (22) in each injection channel (21), and starting the press to enable the plunger (22) to load the viscous medium (4) in each injection channel (21) at the respectively set loading speed, so that the plate blank (3) can be tightly attached to the mould (1) at each position.
2. The method for controlling the non-uniform pressure of a composite viscous medium according to claim 1, wherein: the viscous medium (4) is a high molecular polymer, and the molecular weight of the viscous medium (4) is between 100kg/mol and 900 kg/mol.
3. The method for controlling the non-uniform pressure of a composite viscous medium according to claim 2, wherein: the viscous medium (4) in the corresponding injection channel (21) is loaded at a high speed when the deformation degree of the deformation region of the cavity (11) is high, and the viscous medium (4) in the corresponding injection channel (21) is loaded at a low speed when the deformation degree of the deformation region of the cavity (11) is low.
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| DE10026679A1 (en) * | 2000-06-01 | 2001-12-06 | Schuler Smg Gmbh & Co Kg | Process for deep drawing sheet metal into molded parts comprises deforming in the region of the local shape contours using an active medium of a fluid stream directed against the shape contours |
| CN1962108A (en) * | 2006-11-24 | 2007-05-16 | 哈尔滨工业大学 | Forming method of high-strength high temperature-resistant thin-wall special-shaped curved corrugated fittings |
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| CN101537453A (en) * | 2009-04-10 | 2009-09-23 | 哈尔滨工业大学 | Pressure control method for forming aluminum alloy covering part viscoelastic-plastic soft mode |
| CN109746302A (en) * | 2019-02-22 | 2019-05-14 | 河南科技大学 | Magneto-rheological combined soft mode and sheet material forming method based on magneto-rheological combined soft mode |
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2021
- 2021-02-10 CN CN202110185165.0A patent/CN112917988B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JPS62234624A (en) * | 1986-04-02 | 1987-10-14 | Hitachi Ltd | Manufacture of spherical shell like metal part |
| DE10026679A1 (en) * | 2000-06-01 | 2001-12-06 | Schuler Smg Gmbh & Co Kg | Process for deep drawing sheet metal into molded parts comprises deforming in the region of the local shape contours using an active medium of a fluid stream directed against the shape contours |
| CN1962108A (en) * | 2006-11-24 | 2007-05-16 | 哈尔滨工业大学 | Forming method of high-strength high temperature-resistant thin-wall special-shaped curved corrugated fittings |
| CN100999003A (en) * | 2006-12-29 | 2007-07-18 | 哈尔滨工业大学 | Viscous medium bidirection press cold shaping method of titanium and titanium alloy plate material parts |
| CN101537453A (en) * | 2009-04-10 | 2009-09-23 | 哈尔滨工业大学 | Pressure control method for forming aluminum alloy covering part viscoelastic-plastic soft mode |
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