Glass bottle forming molds that suppress neck tilt and their temperature control methods

Abstract

This invention relates to the field of glass bottle manufacturing, and discloses a glass bottle forming mold for suppressing bottle neck tilting and its temperature control method. The forming mold includes a pair of openable forming half-molds. Each half-mold has at least one ring of cooling holes near its outer side. An arc-shaped groove is arranged around the half-bottle cavity between the cooling holes and the half-bottle cavity, with the bottom of the groove extending below the shoulder transition section. An arc-shaped heat-conducting layer is sealed within the arc-shaped groove, and this layer contains several directional cooling channels. An arc-shaped flow channel is formed between the bottom of the arc-shaped heat-conducting layer and the bottom of the arc-shaped groove. The thermal conductivity of the arc-shaped heat-conducting layer is lower than that of the forming half-mold. An air inlet, connected to the arc-shaped flow channel, is located in the middle of the bottom of the arc-shaped groove on the outer wall of the forming half-mold. The air inlet is connected to compressed air via an air pipe, and the air pipe is equipped with a flow regulating valve. This invention enables directional cooling of the shoulder transition section and / or the bottle neck section, and the cooling rate is adjustable.

Description

Technical Field

[0001] This invention relates to the field of glass bottle manufacturing, and in particular to a glass bottle forming mold that suppresses bottle neck tilting and its temperature control method. Background Technology

[0002] In the process of a row-type bottle-making machine, after the glass droplet is formed into a preform by the primary mold, it is transferred to the forming mold and finally shaped by positive air blowing. The cavity of the forming mold includes the neck section, the shoulder transition section, and the bottle body section. In production practice, the shoulder transition section often becomes the area with the most severe heat accumulation due to the drastic changes in wall thickness, small heat dissipation area, and large mold metal volume. Excessive local temperature can cause the glass to not be fully solidified when it exits the mold, and plastic deformation will occur under the action of gravity or mechanical force, resulting in a "neck skew" defect, causing a high scrap rate and customer complaints.

[0003] Current cooling solutions mostly utilize cooling holes around the perimeter of the molding die. This approach lacks targeted cooling coverage and cannot precisely cool the shoulder transition section and neck section. For some products, existing technologies, to prevent overcooling of the shoulder transition section and / or neck section, employ a slit on the outside of the molding die at the shoulder transition section that cuts off the cooling holes (e.g., a mold for preventing cold lines on the bottom of glass bottles disclosed in CN202220681051.5). This slit blocks the cooling airflow. However, this type of mold is only suitable for producing specific products, limiting its applicability. When producing products of the same specifications but different wall thicknesses, the mold needs to be changed, increasing production costs.

[0004] Based on this, this application provides a glass bottle forming mold and its temperature control method that can directionally cool the shoulder transition section and / or the bottleneck section with an adjustable cooling rate to suppress bottleneck tilt, thereby solving the above problems. Summary of the Invention

[0005] The present invention aims to solve the technical problems existing in the prior art. To this end, the present invention provides a glass bottle forming mold and its temperature control method that can directionally cool the shoulder transition section and / or the neck section with an adjustable cooling rate to suppress neck tilt.

[0006] The technical solution adopted by this invention to solve its technical problem is:

[0007] In a first aspect, a glass bottle forming mold for suppressing bottle neck tilt is provided, comprising a pair of openable forming half molds, each forming half mold having a parting surface with a half-bottle-shaped cavity. The half-bottle-shaped cavity includes, from top to bottom, a bottle neck section, a shoulder transition section, and a bottle body section along the axial direction. The forming half mold has at least one ring of cooling holes near its outer side. An arc-shaped groove is arranged around the half-bottle-shaped cavity between the cooling holes and the half-bottle-shaped cavity, with the bottom of the arc-shaped groove extending below the shoulder transition section. An arc-shaped heat-conducting layer is sealed and embedded within the arc-shaped groove, and the arc-shaped heat-conducting layer has several directional cooling channels, with an arc-shaped flow channel formed between the bottom of the arc-shaped heat-conducting layer and the bottom of the arc-shaped groove. The thermal conductivity of the arc-shaped heat-conducting layer is less than that of the forming half mold. An air inlet connected to the arc-shaped flow channel is also provided on the outer wall of the forming half mold at the middle of the bottom of the arc-shaped groove. The air inlet is connected to compressed air via an air pipe, and the air pipe is equipped with a flow regulating valve.

[0008] In some alternative embodiments, the directional cooling channels are microchannels of 1.0 to 4.0 mm, which are circumferentially uniformly or non-uniformly distributed.

[0009] In some alternative embodiments, when the directional cooling channels are non-uniformly distributed, the spacing between the channels is reduced to 60% to 80% of the uniform spacing in the direction where the cavity curvature is large or the heat dissipation conditions are poor.

[0010] In some alternative embodiments, the arc-shaped heat-conducting layer is made of beryllium copper alloy, pure copper, or copper-tungsten alloy, and is integrated with the molding half-mold by inlay casting or hot pressing.

[0011] In some alternative embodiments, the arc-shaped thermal conductive layer is made of a material with a thermal conductivity of not less than 150 W / (m·K).

[0012] In some alternative embodiments, a temperature sensor and a controller are also included, wherein: at least one temperature sensor is embedded in the molding half near the shoulder transition section; the controller is electrically connected to the temperature sensor and the flow regulating valve, and the controller is configured to: adjust the opening of the flow regulating valve using a PID control algorithm based on the difference between the real-time temperature detected by the temperature sensor and a preset target temperature.

[0013] Secondly, a temperature control method based on the aforementioned glass bottle forming mold is provided, comprising the following steps:

[0014] Step S1: The real-time temperature T1 of the shoulder transition section is collected in real time by the temperature sensor;

[0015] In step S2, the controller calculates the deviation ΔT between the real-time temperature T1 and the preset target temperature T0, and generates a control signal based on ΔT using a PID control algorithm.

[0016] Step S3: When ΔT > 0, the controller increases the opening of the flow regulating valve to increase the cooling medium flow rate; when ΔT ≤ 0, the controller decreases the opening of the flow regulating valve or maintains the minimum cooling flow rate.

[0017] In step S4, cooling air flows into each of the directional cooling channels through the arc-shaped flow channel, absorbs the heat conducted by the arc-shaped heat-conducting layer through convective heat transfer, and is then discharged.

[0018] Compared with the prior art, the beneficial effects of the present invention are:

[0019] This invention forms an independently controlled heat-conducting structure in the shoulder transition section and the bottleneck section through an arc-shaped heat-conducting layer, which can achieve precise temperature control in the shoulder transition section and the bottleneck section, avoid over- or under-cooling, fundamentally suppress bottleneck skew defects, and greatly reduce scrap rate; at the same time, this design also enables the molding die to meet the production of products of the same specification but different wall thicknesses, reducing the cost of mold replacement. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort, wherein:

[0021] Figure 1 This is a diagram of the mold closing structure of the glass bottle forming mold for suppressing bottle neck tilt provided by the present invention;

[0022] Figure 2 This is a partial cross-sectional view of the molding half-mold in the mold-parting state of the glass bottle molding mold for suppressing bottle neck tilt provided by the present invention.

[0023] The attached diagram lists the components represented by each number as follows:

[0024] 1. Molding half mold, 1.1 half bottle-shaped cavity, 1.1 neck section, 1.1a shoulder transition section, 1.1b bottle body section, 1.1c cooling hole, 1.2 arc groove, 1.3 arc flow channel, 1.4 air inlet, 1.5 process hole, 1.6 arc heat conduction layer, 2.1 directional cooling channel, 3 air pipe, 4 flow regulating valve, 5 plug. Detailed Implementation

[0025] It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0026] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] In the description of this invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0028] Furthermore, the terms "installation," "connection," and "linking" in this invention should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of these terms in this invention based on the specific circumstances.

[0029] Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0030] Example 1

[0031] As attached Figure 1 and attached Figure 2 As shown, this embodiment provides a glass bottle forming mold for suppressing neck tilt, including a pair of openable molds. Each of the forming half molds has a parting surface, on which a half-bottle-shaped cavity 1.1 is provided. The half-bottle-shaped cavity includes a neck section 1.1a, a shoulder transition section 1.1b, and a bottle body section 1.1c in sequence from top to bottom along the axial direction. The forming half mold 1 has at least one ring of cooling holes 1.2 near the outer side for cooling the cavity inside the forming mold.

[0032] To address the problem that existing molding dies cannot provide precise directional cooling for the shoulder transition section and bottleneck section, this embodiment provides an arc-shaped groove 1.3 arranged around the cavity between the cooling hole 1.2 of the molding half-mold 1 and the half-bottle-shaped cavity 1.1. The bottom of the arc-shaped groove 1.3 extends below the shoulder transition section 1.1b. An arc-shaped heat-conducting layer 2 is sealed and embedded inside the arc-shaped groove 1.3. The arc-shaped heat-conducting layer 2 has several directional cooling channels 2.1, and an arc-shaped flow channel 1.4 is formed between the bottom of the arc-shaped heat-conducting layer 2 and the bottom of the arc-shaped groove 1.3. The outer wall of the molding half-mold 1 is also provided with an air inlet 1.5 connected to the arc-shaped flow channel 1.4 at the middle of the bottom of the arc-shaped groove 1.3. The air inlet 1.5 is connected to compressed air through an air pipe 3. The air pipe 3 is provided with a flow regulating valve 4 to regulate the air flow rate entering the arc-shaped flow channel, thereby regulating the cooling rate.

[0033] This embodiment can form an independently controlled heat-conducting structure in the shoulder transition section and the bottleneck section through the arc-shaped heat-conducting layer, which can achieve precise temperature control in the shoulder transition section and the bottleneck section, avoid over- or under-cooling, fundamentally suppress the bottleneck skew defect, and greatly reduce the scrap rate; at the same time, this design also enables the molding die to meet the production of products of the same specification but different wall thicknesses, reducing the mold replacement cost.

[0034] It is worth noting that each molding half-mold 1 has a process hole 1.6 on its outer wall at the bottleneck section, and the arc-shaped groove 1.3 will cut off the process hole 1.6, as shown in the attached figure. Figure 2 As shown, in order to ensure the sealing of the process hole, the inner and outer walls of the process hole 1.6 located in the arc groove are sealed with plugs 5.

[0035] Preferably, the thermal conductivity of the arc-shaped heat-conducting layer 2 in this embodiment is lower than that of the molding half-mold 1. Specifically, it can be made of beryllium copper alloy, pure copper, or copper-tungsten alloy, and preferably of a material with a thermal conductivity of not less than 150 W / (m·K), such as pure copper. In this embodiment, the arc-shaped heat-conducting layer 2 is preferably integrated with the molding half-mold through a casting or hot-pressing process.

[0036] Preferably, the directional cooling channel 2.1 in this embodiment is a micro channel of 1.0~4.0mm, which is circumferentially uniformly distributed or non-uniformly distributed; when the directional cooling channel 2.1 is non-uniformly distributed, in the direction where the cavity curvature is large or the heat dissipation conditions are poor, the arrangement spacing of the channel is reduced to 60%~80% of the uniform spacing.

[0037] Furthermore, this embodiment also includes a temperature sensor and a controller, wherein: at least one temperature sensor (not shown in the figure) is embedded in the molding half mold near the shoulder transition section; the controller (not shown in the figure) is electrically connected to the temperature sensor and the flow regulating valve, and the controller is configured to: adjust the opening of the flow regulating valve using a PID control algorithm based on the difference between the real-time temperature detected by the temperature sensor and the preset target temperature.

[0038] In this embodiment, a temperature sensor is used to detect the temperature of the shoulder transition section in real time. The controller uses a PID control algorithm to adjust the opening of the flow regulating valve, thereby realizing automatic adjustment of the cooling rate of the shoulder transition section and the bottleneck section. The PID algorithm can achieve closed-loop precise temperature control.

[0039] Example 2

[0040] This embodiment provides a temperature control method based on the glass bottle forming mold described in Embodiment 1, including the following steps:

[0041] Step S1: The real-time temperature T1 of the shoulder transition section is collected in real time by the temperature sensor;

[0042] In step S2, the controller calculates the deviation ΔT between the real-time temperature T1 and the preset target temperature T0, and generates a control signal based on ΔT using a PID control algorithm.

[0043] Step S3: When ΔT > 0, the controller increases the opening of the flow regulating valve to increase the cooling medium flow rate; when ΔT ≤ 0, the controller decreases the opening of the flow regulating valve or maintains the minimum cooling flow rate.

[0044] In step S4, cooling air flows into each of the directional cooling channels through the arc-shaped flow channel, absorbs the heat conducted by the arc-shaped heat-conducting layer through convective heat transfer, and is then discharged.

[0045] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention specification, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A glass bottle forming mold for suppressing neck tilting, comprising a pair of openable and closable forming half-molds, each forming half-mold having a parting surface, the parting surface having a half-bottle-shaped cavity, the half-bottle-shaped cavity comprising, from top to bottom along the axial direction, a neck section, a shoulder transition section, and a bottle body section, the forming half-mold having at least one ring of cooling holes near its outer side; characterized in that: An arc-shaped groove is provided between the cooling hole of the molding half mold and the half bottle-shaped cavity, and the bottom of the arc-shaped groove extends to below the shoulder transition section. An arc-shaped heat-conducting layer is sealed and embedded in the arc-shaped groove. The arc-shaped heat-conducting layer is provided with several directional cooling channels, and an arc-shaped flow channel is formed between the bottom of the arc-shaped heat-conducting layer and the bottom of the arc-shaped groove. The thermal conductivity of the arc-shaped heat-conducting layer is less than that of the molding half-mold; The outer wall of the molding half-mold is provided with an air inlet in the middle of the bottom of the arc-shaped groove, which is connected to the arc-shaped flow channel. The air inlet is connected to compressed air through an air pipe, and the air pipe is provided with a flow regulating valve.

2. The glass bottle forming mold for suppressing neck tilt according to claim 1, characterized in that: The directional cooling channels are micro-channels of 1.0~4.0mm, which are circumferentially uniformly or non-uniformly distributed.

3. The glass bottle forming mold for suppressing neck tilt according to claim 2, characterized in that: When the directional cooling channels are non-uniformly distributed, the spacing between the channels is reduced to 60% to 80% of the uniform spacing in the direction where the cavity curvature is large or the heat dissipation conditions are poor.

4. The glass bottle forming mold for suppressing neck tilting according to claim 1, characterized in that: The arc-shaped heat-conducting layer is made of beryllium copper alloy, pure copper, or copper-tungsten alloy, and is integrated with the molded half-mold through a casting or hot-pressing process.

5. The glass bottle forming mold for suppressing neck tilting according to claim 4, characterized in that: The arc-shaped heat-conducting layer is made of a material with a thermal conductivity of not less than 150 W / (m·K).

6. The glass bottle forming mold for suppressing bottle neck tilt according to any one of claims 1 to 5, characterized in that: It also includes a temperature sensor and a controller, wherein: At least one temperature sensor is embedded in the molding half-mold near the shoulder transition section; The controller is electrically connected to the temperature sensor and the flow regulating valve, and the controller is configured to adjust the opening of the flow regulating valve using a PID control algorithm based on the difference between the real-time temperature detected by the temperature sensor and the preset target temperature.

7. A temperature control method based on the glass bottle forming mold according to claim 6, characterized in that: Includes the following steps: Step S1: The real-time temperature T1 of the shoulder transition section is collected in real time by the temperature sensor; In step S2, the controller calculates the deviation ΔT between the real-time temperature T1 and the preset target temperature T0, and generates a control signal based on ΔT using a PID control algorithm. Step S3: When ΔT > 0, the controller increases the opening of the flow regulating valve to increase the cooling medium flow rate; when ΔT ≤ 0, the controller decreases the opening of the flow regulating valve or maintains the minimum cooling flow rate. In step S4, cooling air flows into each of the directional cooling channels through the arc-shaped flow channel, absorbs the heat conducted by the arc-shaped heat-conducting layer through convective heat transfer, and is then discharged.

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