Press-blow molding method and system
By dividing the time phase of the top core stamping into multiple stages and setting the target air pressure, the problem of many defects in the traditional preliminary bottle forming process is solved, and the quality of the preliminary bottle and the yield rate of the bottle are improved.
Patent Information
- Application Number
- CN202411871676.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-18
- Publication Date
- 2025-03-18
AI Technical Summary
The initial bottles manufactured by the traditional preliminary bottle forming process have many defects, including cracks and poor molding at the mouth of the preliminary bottle, excessively thick sutures on the bottle body, and poor uniformity of the bottle body, which affects the finished product quality and pass rate of the bottle.
By dividing the time phase of the top core stamping into multiple time phase stages, and setting the bottle and can molding target air pressure for each time phase stage, the pressure blowing pressure is controlled to achieve the target air pressure for different time phase stages, thereby obtaining high-quality preliminary bottle and can.
This method can adjust the air pressure provided by the top core according to the changes in the material properties of the glass frit dripping in the initial mold, thereby significantly improving the quality of the initial bottle, reducing the scrap rate of the bottle and improving the bottle production yield.
Smart Images
Figure CN119638168A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of bottle and can manufacturing, and in particular to a compression-blow molding method and system. Background Art
[0002] When making bottles and jars using the pressure-blowing method on a bottle-making machine, the glass drop must first be made into a prototype bottle in a prototype mold. The so-called prototype bottle refers to a prototype blank with a mouth shape, a preliminary appearance and an internal cavity of a certain capacity. The prototype blank is formed into a finished glass bottle or jar by positive blowing in the forming mold. The molding of the prototype bottle directly determines the final quality of the bottle or jar, and is a crucial step in the entire bottle-making process.
[0003] The glass drop is formed into a preliminary bottle in the preliminary mold by pushing a core (punch) into the preliminary mold for stamping. The core is installed on the core cylinder piston shaft of the pressure-blowing mechanism. The cylinder piston shaft is driven by compressed air and moves up and down according to the timing of the bottle making cycle set by the control system to stamp the drop into a preliminary bottle.
[0004] However, the prototype bottles manufactured by the above-mentioned traditional prototype bottle molding process have many defects, such as cracks and poor molding at the mouth of the prototype bottle, too thick seams on the bottle body, and poor uniformity of the bottle body, which also affects the quality of the finished bottles and the pass rate cannot be improved. Summary of the invention
[0005] The embodiments of the present application provide a compression blow molding method and system to solve the problem that the primary bottles manufactured by the traditional primary bottle molding process in the related art have many defects.
[0006] In a first aspect, a pressure-blow molding method is provided, comprising:
[0007] According to the time sequence of the stamping, the time phase of the top core stamping is divided into a plurality of time phase stages, and the target air pressure for bottle and can molding in each of the time phase stages is set;
[0008] According to the time sequence of stamping, the pressure-blow molding air pressure is controlled so that at each time phase, the pressure-blow molding is performed according to the corresponding target air pressure to obtain a preliminary bottle can.
[0009] In some embodiments, according to the time sequence of stamping, the multiple time phase stages include a first time phase stage, a second time phase stage and a third time phase stage;
[0010] The target air pressure in the first time phase stage is greater than the target air pressure in the second time phase stage;
[0011] The target air pressure in the third time phase is greater than the target air pressure in the second time phase.
[0012] In some embodiments, the target gas pressure in the first time phase is configured to blow a solid glass mass into a hollow mass;
[0013] The target air pressure in the second time phase is configured to blow the hollow material close to the wall of the primary mold;
[0014] The target air pressure in the third time phase is configured to blow the hollow material to fit the wall surface of the primary mold.
[0015] In some embodiments, the target air pressure in the first time phase is 0.27 MPa to 0.29 MPa;
[0016] The target air pressure in the first time phase is 0.14MPa to 0.16MPa;
[0017] The target air pressure in the first time phase is 0.25 MPa to 0.27 MPa.
[0018] In some embodiments, the target air pressure in the first time phase is 0.28 MPa;
[0019] The target air pressure in the first time phase is 0.15 MPa;
[0020] The target air pressure in the first time phase is 0.26 MPa.
[0021] In some embodiments, the time phase of the top core punching is [40°, 108°];
[0022] The first time phase stage is [40°, 65°);
[0023] The second time phase stage is [65°, 85°);
[0024] The third time phase stage is [85°, 108°].
[0025] In a second aspect, a pressure-blow molding system is provided, comprising:
[0026] A pressure-blow mechanism, the pressure-blow mechanism comprising a piston rod and a top core arranged on the piston rod;
[0027] gas tank;
[0028] A proportional valve, one end of which is connected to the gas storage tank, and the other end of which is connected to the pressure-blow mechanism through an air pipe;
[0029] The analog module is connected to the proportional valve and is used to: control the pressure-blow air pressure output by the proportional valve according to the time sequence of stamping, so that the pressure-blow molding is performed according to the corresponding target air pressure at each time phase stage to obtain a preliminary bottle;
[0030] Among them, each of the time phase stages is obtained by dividing the time phase of the top core punching according to the time sequence of the punching, and each of the time phase stages is set with a target air pressure for bottle molding.
[0031] In some embodiments, the proportional valve is connected to a filter, the filter is connected to a ball valve, and the ball valve is connected to the air storage tank.
[0032] In some embodiments, the proportional valve is fixed to the gas storage tank via a mounting plate;
[0033] And / or, the proportional valve is a high-voltage electrical proportional valve;
[0034] And / or, the compression-blow molding system further comprises a mold, wherein the mold comprises a blank mold and a mouth mold, and the mouth mold is assembled on the blank mold to form a mold cavity between the blank mold and the mouth mold.
[0035] In some embodiments, the compression blow molding system further includes a bottle making machine control cabinet, wherein the bottle making machine control cabinet stores each of the time phase stages and a target air pressure corresponding to each of the time phase stages;
[0036] The analog quantity module is used to call each of the time phase stages stored in the bottle making machine control cabinet, and the target air pressure corresponding to each of the time phase stages, so as to control the pressure-blowing air pressure output by the proportional valve.
[0037] The beneficial effects of the technical solution provided by this application include:
[0038] The compression-blow molding method provided in the present application performs segmented control on the pressure (time) during the rising process of the top core when manufacturing glass containers (such as glass bottles and jars) and the like, when molding the preliminary bottle, that is, the time phase of the top core stamping is divided into multiple time phase stages, and the target air pressure for the bottle and jar molding in each of the time phase stages is set. Since this method can provide different target air pressures for the top core in different time phase stages according to the material properties of the glass droplets that are constantly changing during the molding process in the preliminary mold, the quality of the stamped preliminary bottle is greatly improved, thereby greatly reducing the scrap rate of the bottles and jars and improving the yield of bottle manufacturing. BRIEF DESCRIPTION OF THE DRAWINGS
[0039] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.
[0040] Figure 1 A flow chart of the compression-blow molding method provided in an embodiment of the present application;
[0041] Figure 2 Schematic diagram of the compression blow molding system provided in an embodiment of the present application.
[0042] In the figure: 1. press-blow mechanism; 10. piston rod; 11. top core; 2. gas storage tank; 3. proportional valve; 30. air pipe; 4. analog module; 5. filter; 6. ball valve; 7. mounting plate; 8. bottle making machine control cabinet; 9. mold; 90. prototype mold; 91. mouth mold. DETAILED DESCRIPTION
[0043] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.
[0044] The applicant has found that the temperature and properties of the glass droplets are the most important parameters that need to be controlled when forming glass bottles and jars. The forming process of glass bottles and jars is a process in which the glass droplets continuously exchange heat with the mold and the external environment temperature. The same is true for the molding of the prototype bottle: before the glass drop is introduced into the prototype mold, the drop has a relatively high temperature (the material temperature is generally 900-1300℃), and has a certain elasticity and viscosity (material properties). After being introduced into the prototype mold, during the entire stamping process, the drop is constantly exchanging heat with the prototype mold and the top core, and the material properties change accordingly. However, the traditional prototype bottle molding process does not take this factor into consideration. As mentioned above, the traditional prototype bottle molding process is that the top core is driven by a constant air pressure within a set time phase. At this time, within this set time phase, the top core is stamped at a uniform speed. The prototype bottle made by this stamping method will have many defects. The main reason is that during the molding process of the prototype bottle, the pressure value of the top core and the time domain under this pressure value cannot be adjusted according to the change in material properties, resulting in many defects in the prototype bottle, thereby affecting the quality of the finished bottle and the qualified rate cannot be improved.
[0045] Because of this critical problem, the applicant has improved the traditional primary bottle molding process. Specifically, see Figure 1 As shown, the embodiment of the present application provides a pressure-blow molding method, which includes the following steps:
[0046] 101: According to the time sequence of the stamping, the time phase of the top core stamping is divided into a plurality of time phase stages, and the target air pressure for bottle molding in each of the time phase stages is set.
[0047] 102: Controlling the blow molding air pressure according to the stamping time sequence, so that the blow molding is performed according to the corresponding target air pressure at each time phase stage to obtain a preliminary bottle can.
[0048] The compression-blow molding method provided in the present application performs segmented control on the pressure (time) during the rising process of the top core when manufacturing glass containers (such as glass bottles and jars) and the like, when molding the preliminary bottle, that is, the time phase of the top core stamping is divided into multiple time phase stages, and the target air pressure for the bottle and jar molding in each of the time phase stages is set. Since this method can provide different target air pressures for the top core in different time phase stages according to the material properties of the glass droplets that are constantly changing during the molding process in the preliminary mold, the quality of the stamped preliminary bottle is greatly improved, thereby greatly reducing the scrap rate of the bottles and jars and improving the yield of bottle manufacturing.
[0049] For the more traditional stamping process, the improvement of molding quality includes many aspects. For example, as an example, it has good bottle body uniformity (thickness consistency of the bottle body in the circumferential direction); as another example, it eliminates the mouth cracks and poor molding problems of the initial bottle; as another example, it eliminates the excessively rough seam lines of the bottle body.
[0050] It can be understood that the greater the number of time phase stages, the more precise the control is, but at the same time the more difficult the control is.
[0051] Therefore, the number of time phase stages to be divided can be determined according to actual needs.
[0052] For example, as an example, according to the time sequence of stamping, multiple time phase stages include a first time phase stage, a second time phase stage and a third time phase stage; wherein, the target air pressure of the first time phase stage is greater than the target air pressure of the second time phase stage; the target air pressure of the third time phase stage is greater than the target air pressure of the second time phase stage.
[0053] Furthermore, the target air pressure for each time phase stage can be set according to actual needs. For example, the target air pressure of the first time phase stage is configured to blow the solid glass mass into a hollow material so that it rushes to the top of the prototype mold. Since it needs to be blown into a hollow shape, the target air pressure at this time is relatively high. The target air pressure of the second time phase stage is configured to blow the hollow material close to the wall of the prototype mold. Since this stage only needs to be close to or slightly close to the wall of the prototype mold, it is avoided that the glass liquid is squeezed into the mold joint line due to excessive pressure. Therefore, compared with the previous stage, the target air pressure can be lowered in this stage, and the hollow material is blown gently. The target air pressure of the third time phase stage is configured to blow the hollow material to fit the wall of the prototype mold. At this stage, the blank has stabilized. At this time, the temperature of the glass liquid is reduced, and the possibility of defects is reduced. A larger air pressure is required to maintain the blank vertically when it is flipped.
[0054] It can be seen that the target air pressure at each of the above time phases can be given based on experience, or through multiple tests, the air pressure when the quality of the initial bottle meets the requirements can be determined and used as the target air pressure.
[0055] It can be understood that in the second time phase, the hollow material is blown close to the wall of the initial mold, which can be understood as: the hollow material fits or partially fits the wall of the initial mold, and the pressure of the hollow material on the wall of the initial mold is lower than a pressure threshold when fitting, that is, the hollow material is close to the wall of the initial mold, and this pressure threshold can be set manually. Or it can be judged based on observation and other empirical methods, for example, the morphology presented when the hollow material fits the wall of the initial mold is compared with a set surface morphology. If they are the same or similar, the hollow material is close to the wall of the initial mold, and this set surface morphology can also be determined manually.
[0056] It is understandable that different glass bottles or different glass raw materials, or different preparation environment temperatures, etc. may affect the target air pressure values at different time phases.
[0057] As an example, the target air pressure in the first time phase stage is 0.27MPa~0.29MPa; the target air pressure in the first time phase stage is 0.14MPa~0.16MPa; the target air pressure in the first time phase stage is 0.25MPa~0.27MPa.
[0058] Preferably, the target air pressure in the first time phase is 0.28 MPa; the target air pressure in the first time phase is 0.15 MPa; and the target air pressure in the first time phase is 0.26 MPa.
[0059] As an example, the time phase of the top core punching is [40°, 108°]; the first time phase stage is [40°, 65°]; the second time phase stage is [65°, 85°]; and the third time phase stage is [85°, 108°].
[0060] See also Figure 2 As shown, based on the above-mentioned pressure-blow molding method, an embodiment of the present application further provides a pressure-blow molding system, which includes a pressure-blow mechanism 1, an air tank 2, a proportional valve 3 and an analog module 4, wherein the pressure-blow mechanism 1 has a piston rod 10 and a top core 11 arranged on the piston rod 10, one end of the proportional valve 3 is connected to the air tank 2, and the other end is connected to the pressure-blow mechanism 1 through an air pipe 30; the analog module 4 is connected to the proportional valve 3, and is used to: control the pressure-blow air pressure output by the proportional valve 3 according to the time sequence of stamping, so that each time phase stage is press-blow molded according to the corresponding target air pressure to obtain a preliminary bottle; wherein each time phase stage is obtained by dividing the time phase of the top core stamping according to the time sequence of stamping, and each time phase stage is set with a target air pressure for bottle molding.
[0061] By utilizing the compression-blow molding system provided in the embodiment of the present application, the quality of the punched-out preliminary bottles can be greatly improved, thereby greatly reducing the scrap rate of bottles and cans and improving the yield rate of bottle manufacturing.
[0062] At the same time, the analog module 4 controls the blowing air pressure according to the pre-divided time phase stages and the corresponding target air pressure, making the control more convenient and quick, reducing labor intensity and improving the bottle making efficiency.
[0063] See also Figure 2 As shown, the proportional valve 3 is connected to a filter 5, the filter 5 is connected to a ball valve 6, and the ball valve 6 is connected to the air storage tank 2. The filter 5 can filter out impurities in the compressed air to prevent damage to the system.
[0064] See also Figure 2 As shown, the proportional valve 3 is fixed to the gas tank 2 through a mounting plate 7. The proportional valve 3 adopts a high-voltage electrical proportional valve. The compression-blow molding system also includes a mold 9. The mold 9 includes a primary mold 90 and a mouth mold 91. The mouth mold 91 is assembled on the primary mold 90 to form a mold cavity between the primary mold 90 and the mouth mold 91.
[0065] See also Figure 2As shown, the compression-blow molding system also includes a bottle making machine control cabinet 8, which stores each of the time phase stages and the target air pressure corresponding to each of the time phase stages; the analog module 4 is used to call each of the time phase stages stored in the bottle making machine control cabinet 8, and the target air pressure corresponding to each of the time phase stages, so as to control the compression-blow air pressure output by the proportional valve 3.
[0066] The analog quantity module 4 is connected to the bottle making machine control cabinet 8, which can also ensure that the analog quantity module 4 is synchronously controlled with the bottle making cycle.
[0067] In the description of the present application, it should be noted that the terms "upper", "lower", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.
[0068] It should be noted that, in this application, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.
[0069] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.
Claims
1. A pressure-blow molding method, characterized in that: It includes: According to the time sequence of the stamping, the time phase of the top core stamping is divided into a plurality of time phase stages, and the target air pressure for bottle and can molding in each of the time phase stages is set; According to the time sequence of stamping, the pressure-blow molding air pressure is controlled so that at each time phase, the pressure-blow molding is performed according to the corresponding target air pressure to obtain a preliminary bottle can.
2. The pressure-blow molding method according to claim 1, wherein: According to the time sequence of stamping, the multiple time phase stages include a first time phase stage, a second time phase stage and a third time phase stage; The target air pressure in the first time phase stage is greater than the target air pressure in the second time phase stage; The target air pressure in the third time phase is greater than the target air pressure in the second time phase.
3. The pressure-blow molding method according to claim 2, characterized in that: The target gas pressure in the first time phase is configured to blow a solid glass mass into a hollow mass; The target air pressure in the second time phase is configured to blow the hollow material close to the wall of the primary mold; The target air pressure in the third time phase is configured to blow the hollow material to fit the wall surface of the primary mold.
4. The pressure-blow molding method according to claim 2 or 3, characterized in that: The target air pressure in the first time phase is 0.27 MPa to 0.29 MPa; The target air pressure in the first time phase is 0.14MPa to 0.16MPa; The target air pressure in the first time phase is 0.25 MPa to 0.27 MPa.
5. The pressure-blow molding method according to claim 4, characterized in that: The target air pressure in the first time phase is 0.28 MPa; The target air pressure in the first time phase is 0.15 MPa; The target air pressure in the first time phase is 0.26 MPa.
6. The pressure-blow molding method according to claim 2, wherein: The time phase of the top core punching is [40°, 108°]; The first time phase stage is [40°, 65°); The second time phase stage is [65°, 85°); The third time phase stage is [85°, 108°].
7. A pressure-blow molding system, characterized in that: It includes: A pressure-blowing mechanism (1), the pressure-blowing mechanism (1) comprising a piston rod (10) and a top core (11) arranged on the piston rod (10); Gas tank (2); A proportional valve (3), one end of which is connected to the gas storage tank (2), and the other end of which is connected to the pressure-blowing mechanism (1) through an air pipe (30); The analog quantity module (4) is connected to the proportional valve (3) and is used to: control the pressure of the blow molding output by the proportional valve (3) according to the time sequence of the stamping, so that the blow molding is performed according to the corresponding target pressure at each time phase stage to obtain a preliminary bottle; Among them, each of the time phase stages is obtained by dividing the time phase of the top core punching according to the time sequence of the punching, and each of the time phase stages is set with a target air pressure for bottle molding.
8. The press-blow molding system according to claim 7, characterized in that: The proportional valve (3) is connected to a filter (5), the filter (5) is connected to a ball valve (6), and the ball valve (6) is connected to the gas storage tank (2).
9. The press-blow molding system according to claim 7, characterized in that: The proportional valve (3) is fixed to the gas storage tank (2) via a mounting plate (7); And / or, the proportional valve (3) is a high-voltage electrical proportional valve; And / or, the compression-blow molding system further comprises a mold (9), wherein the mold (9) comprises a primary mold (90) and a mouth mold (91), wherein the mouth mold (91) is assembled on the primary mold (90) to form a mold cavity between the primary mold (90) and the mouth mold (91).
10. The press-blow molding system according to claim 7, characterized in that: The compression blow molding system further comprises a bottle making machine control cabinet (8), wherein the bottle making machine control cabinet (8) stores each of the time phase stages and a target air pressure corresponding to each of the time phase stages; The analog module (4) is used to call each of the time phase stages stored in the bottle making machine control cabinet (8), and the target air pressure corresponding to each of the time phase stages, so as to control the pressure blowing air pressure output by the proportional valve (3).