CN117207442A - Terminal in-mold forming method - Google Patents
Terminal in-mold forming method Download PDFInfo
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- CN117207442A CN117207442A CN202311483520.8A CN202311483520A CN117207442A CN 117207442 A CN117207442 A CN 117207442A CN 202311483520 A CN202311483520 A CN 202311483520A CN 117207442 A CN117207442 A CN 117207442A
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- 238000000034 method Methods 0.000 title claims abstract description 34
- 238000007493 shaping process Methods 0.000 claims abstract description 137
- 238000000465 moulding Methods 0.000 claims abstract description 123
- 238000006073 displacement reaction Methods 0.000 claims abstract description 16
- 238000001746 injection moulding Methods 0.000 claims abstract description 12
- 230000007704 transition Effects 0.000 claims abstract description 4
- 238000005452 bending Methods 0.000 claims description 13
- 239000000463 material Substances 0.000 claims description 13
- 238000004519 manufacturing process Methods 0.000 claims description 9
- 238000003825 pressing Methods 0.000 claims description 5
- 230000003044 adaptive effect Effects 0.000 claims description 4
- 238000004364 calculation method Methods 0.000 claims description 4
- 230000009471 action Effects 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 238000002347 injection Methods 0.000 description 6
- 239000007924 injection Substances 0.000 description 6
- 230000007246 mechanism Effects 0.000 description 4
- 238000007667 floating Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000002513 implantation Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000012795 verification Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
Abstract
The application belongs to the technical field of plastic injection molding, and discloses a terminal in-mold molding method, which comprises the following steps: providing at least one target terminal to be molded, wherein the target terminal is provided with at least a molding section for molding into a target shape, the molding section is provided with molding original parameters, the molding original parameters at least comprise a terminal diameter c and a terminal length d, the target shape is provided with at least a first arc-shaped section and a second arc-shaped section, the first arc-shaped section and the second arc-shaped section are in smooth transition and jointly form an S-shaped molding structure, and the molding structure is provided with a post-shaping displacement dimension E and a post-shaping height F; and calculating to obtain the molding target parameters matched with the target shape according to the molding original parameters of the target terminal molding section, the set post-shaping displacement dimension E and the post-shaping height F. According to the application, the terminal is subjected to in-mold shaping by adopting a novel in-mold shaping method, so that the shaping difficulty can be reduced, the working procedures are simplified, and the shaping and injection molding efficiency can be improved.
Description
Technical Field
The application belongs to the technical field of terminal shaping and injection molding, and particularly relates to a terminal in-mold molding method.
Background
In automotive parts, it is necessary to use a part having a plurality of pin needles or terminals and an injection molded body having a circular shape with a through hole in the middle, the injection molded body part being injection molded by a mold, and the terminals of such a part being shaped. Such parts have two parts, one being a profiled part and a slightly diametrical end part, the shaping being the shaping of the profiled part. In general, the shaped portion needs to be shaped to a corresponding desired shape or size, such as the shaped portion needs to be shaped to a post-shaping displacement dimension E and a post-shaping height F of a given size.
The traditional process is technically difficult and low in efficiency after implantation and positioning and shaping, needs to break through technology, realizes shaping in different modes and batch shaping, and has the following technical difficulties according to the prior art:
1. because the product is small, the number of implantation and shaping PIN is large, the workpiece with the mould shaping structure is small and easy to damage, and the shaping terminal in the mould is easy to insert and damage;
2. the terminal shaping angle needs to be adjusted according to the analysis of the actual shaping size, and no experience can be referred to.
Disclosure of Invention
Therefore, the application aims to provide a terminal in-mold forming method which solves the problems that the conventional terminal forming method is difficult to shape and low in efficiency due to the adoption of a transmission shaping mode.
In order to achieve the above purpose, the present application adopts the following technical scheme:
an in-mold terminal forming method comprising the steps of:
providing at least one target terminal to be molded, wherein the target terminal is provided with at least a molding section for molding into a target shape, the molding section is provided with molding original parameters, the molding original parameters at least comprise a terminal diameter c and a terminal length d, the target shape is provided with at least a first arc-shaped section and a second arc-shaped section, the first arc-shaped section and the second arc-shaped section are in smooth transition and jointly form an S-shaped molding structure, and the molding structure is provided with a post-shaping displacement dimension E and a post-shaping height F;
according to the original molding parameters of the target terminal molding section, the given post-shaping displacement dimension E and the post-shaping height F, molding target parameters which are matched with the target shape are obtained through calculation, wherein the molding target parameters at least comprise the bending radius R1 of the first arc-shaped section, the bending radius R2 of the second arc-shaped section, the center distance E between the center of the first arc-shaped section and the axis of the target terminal and the center distance h between the center of the first arc-shaped section and the center of the second arc-shaped section;
based on the calculated molding target parameters, a shaping workpiece with a cavity guide rail is manufactured, the shape of the cavity guide rail of the shaping workpiece is matched with the target shape, and the corresponding parameters of the cavity guide rail are consistent with the molding target parameters;
fixing the target terminal, enabling the forming section of the target terminal to be positioned in a forming cavity of a die, and enabling the forming section of the target terminal to be guided and formed in a cavity guide rail of the forming section by pressing down the manufactured shaping workpiece;
and (5) carrying out in-mold injection molding after the molding section is molded.
In a possible implementation manner, the step of designing a shaping workpiece with a cavity guide rail based on the calculated shaping target parameter, wherein the shape of the cavity guide rail of the shaping workpiece is matched with the target shape, and the corresponding parameter of the cavity guide rail is consistent with the shaping target parameter, and the method comprises the following steps:
calculating a bending radius R1 of the first arc section according to a formula R1=8×a×b×c×d×E, calculating a bending radius R2 of the second arc section according to a formula R2=R1, calculating a center distance E between the center of the first arc section and the axis of the target terminal according to a formula e=4×b×c×E, and calculating a center distance h between the center of the first arc section and the center of the second arc section according to a formula h=1.8e, wherein a is the material tensile strength of the target terminal, b is the material tensile rate of the target terminal, c is the diameter of the target terminal, and d is the length of the target terminal;
and designing and manufacturing the shaping workpiece with the cavity guide rail consistent with the molding target parameters according to the obtained molding target parameters.
In a possible implementation manner, the steps of fixing the target terminal and positioning the molding section thereof in one molding cavity of the mold, and pressing the manufactured shaping workpiece to enable the molding section of the target terminal to be guided and molded in the cavity guide rail thereof, include the following steps:
providing an adaptive die, wherein the die is provided with a separable upper die and a separable lower die, at least one forming cavity is formed by enclosing the lower die and the upper die, a mounting hole is formed in the top of the upper die corresponding to the forming cavity, and a shaping workpiece is mounted in the mounting hole;
implanting the target terminal into a preset position of the lower die to fix the target terminal and enable the forming section to be positioned in the forming cavity;
the upper die performs die closing action and drives the shaping workpiece to move towards the direction of a target terminal implanted into the lower die so as to enable a cavity guide rail of the shaping workpiece to be in contact with a forming end of the target terminal, and the forming section is gradually pressed in the cavity guide rail and guided to be formed into a target shape.
In a possible implementation manner, the target shape further has a straight line section, the straight line section is parallel to the axial direction of the target terminal before forming, and correspondingly, the forming target parameters further include a vertical height f from the end surface of the straight line section to the center of the first arc-shaped section and a vertical height g from the end surface of the straight line section to the center of the second arc-shaped section, and the cavity guide rail further has a straight guide rail section matched with the straight line section;
designing a shaping workpiece with a cavity guide rail based on the calculated shaping target parameters, wherein the shape of the cavity guide rail of the shaping workpiece is matched with the target shape, and the corresponding parameters of the cavity guide rail are consistent with the shaping target parameters, and the method further comprises the following steps:
calculating to obtain the vertical height F from the end face of the straight line segment to the center of the first arc segment according to the formula f=12×b×c×f;
and calculating the vertical height g from the end face of the straight line segment to the center of the second arc segment according to the formula g=f.
In a possible implementation manner, the inner wall of the mounting hole is correspondingly provided with a sliding groove which is arranged on the cavity guide rail of the shaping workpiece, the sliding groove is identical to the cavity guide rail in structure and can enclose to form a circular cavity matched with the straight line section, and the bottom end of the circular cavity is communicated with the shaping cavity and forms a guiding inlet for the straight line end of the target terminal to enter.
In a possible implementation manner, the mounting hole is formed in a forming block, a forming surface for forming the forming cavity is arranged at the bottom of the forming block, the forming block is longitudinally movably connected with the upper die, the forming workpiece is in sliding fit with the mounting hole, the top end of the forming workpiece penetrates out of the mounting hole to be fixedly connected with the upper die, and a buffer spring is arranged between the forming block and the upper die.
In a possible implementation, the target terminal further has a fixing section with a diameter larger than that of its molding section, and the bottom of the molding cavity has a receptacle for insertion of the fixing section.
In a possible implementation manner, the molding cavity is used for molding a molded part with a plurality of target terminals, a plurality of concave grooves are distributed on the molded part along the circumferential direction, and each concave groove is provided with a molded terminal in a penetrating way.
Compared with the prior art, the application has the following beneficial effects:
according to the in-mold forming method, the terminal is subjected to in-mold forming by adopting the novel in-mold forming method, so that the forming difficulty can be reduced, the working procedure is simplified, the forming and injection molding efficiency can be improved, a forming workpiece matched with the target terminal can be manufactured by adopting a calculation formula based on the size, the material characteristics and the actual manufacturing of the terminal, the forming section of the target terminal can be formed into the target shape under the guide of a cavity guide rail during die assembly, and the product forming efficiency is greatly improved.
Moreover, by adopting the in-mold molding method, batch one-time shaping and molding, such as one-time molding of 16 target terminals, can be performed, shaping and molding efficiency is improved, cost is greatly reduced, and production stability is improved.
Meanwhile, the formula adopted by the method is an algorithm formula obtained through actual verification of different materials and products, and can be popularized and applied to molding of other related or similar products.
In addition, through a large amount of data, terminal verification of different sizes and parameters of copper deformation, the obtained formula can be generally used for molding of the type selection requirements of terminal diameters c=0.2-5 mm, e=0.2-5 mm and f=5-25 mm.
Drawings
Fig. 1 is a schematic structural view of a target terminal according to an embodiment of the present application;
fig. 2 is a schematic structural view of a molded terminal according to an embodiment of the present application;
fig. 3 is a schematic diagram of a terminal forming principle according to an embodiment of the present application;
FIG. 4 is a schematic view of a shaping work piece according to an embodiment of the present application;
FIG. 5 is a schematic view of a first view angle structure of an embodiment of the present application prior to clamping of upper and lower dies of the die, the schematic view also showing an enlarged partial schematic view of a shaped workpiece;
FIG. 6 is a schematic view of a second view angle structure of an embodiment of the present application before clamping of the upper and lower molds, the schematic view also showing an enlarged partial schematic view of the molding cavity and the target terminal and the injection body;
FIG. 7 is a schematic diagram of an in-mold shaping, floating and ejecting molding mechanism according to an embodiment of the present application;
FIG. 8 is a schematic partial cross-sectional view of an in-mold shaping floating ejector molding mechanism according to an embodiment of the present application.
In the figure: 1-target terminals; 11-forming section; 111-a first arc segment; 112-a second arcuate segment; 113-straight line segments; 12-fixing the section; 2-injection molding; 3-shaping the workpiece; 31-cavity guide rail; 32-a linear guide rail section; 4-upper die; 5-lower die; 6, forming a seat; 61-jack; 7-a buffer spring; 9-forming a cavity; 10-forming blocks; 101-a chute; 102-mounting holes.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. The components of the embodiments of the present application generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
The application is further described with reference to the drawings and specific examples.
Referring to fig. 1-8, an embodiment of the application provides a method for molding a terminal in a mold, which includes the following steps:
step S100, providing at least one target terminal 1 to be molded, wherein the target terminal 1 is provided with at least a molding section 11 for molding into a target shape, the molding section 11 is provided with molding original parameters, the molding original parameters at least comprise a terminal diameter c and a terminal length d, the target shape is provided with at least a first arc-shaped section 111 and a second arc-shaped section 112, the first arc-shaped section 111 and the second arc-shaped section 112 are in smooth transition and jointly form an S-shaped molding structure, and the molding structure is provided with a post-molding displacement dimension E and a post-molding height F.
In this step, the target terminal 1 is a linear terminal, and the thinner end thereof is the molding section 11, and since the target terminal 1 is to be molded to meet the use requirement, the post-molding displacement dimension E and the post-molding height F thereof are fixed, and thus it is necessary to reach the corresponding post-molding displacement dimension E and post-molding height F by bending and shaping. The post-shaping displacement dimension E is the displacement dimension of the shaping segment 11 in the X direction after shaping, and the post-shaping height F is the height of the shaping segment 11 in the Y direction after shaping. To shape into the target shape with the first arc-shaped section 111 and the second arc-shaped section 112, the shaping work piece 3 is designed according to the shaping original parameters of the shaping section 11, the displacement dimension E after shaping and the height F after shaping.
Step 200, according to the original molding parameters of the molding section 11 of the target terminal 1, the given post-molding displacement dimension E and the post-molding height F, calculating to obtain molding target parameters which are matched with the target shape, wherein the molding target parameters at least comprise the bending radius R1 of the first arc-shaped section 111, the bending radius R2 of the second arc-shaped section 112, the center distance E between the center of the first arc-shaped section 111 and the axis of the target terminal 1, and the center distance h between the center of the first arc-shaped section 111 and the center of the second arc-shaped section 112.
In this step, the center of the first arc-shaped section 111 is the center of the first arc-shaped section 111, and correspondingly, the center of the second arc-shaped section 112 is the center of the second arc-shaped section 112, h is the center distance between the center of the first arc-shaped section 111 and the center of the second arc-shaped section 112, and e is the distance between the center of the first arc-shaped section 111 and the axis of the target terminal 1. Based on these dimensions, the adapted R1 and R2 can be calculated, and thus the matched shaped workpiece 3 can be manufactured easily.
Step S300, based on the calculated molding target parameters, a shaping workpiece 3 with a cavity guide rail is manufactured, the shape of the cavity guide rail 31 of the shaping workpiece 3 is matched with the target shape, and the corresponding parameters of the cavity guide rail 31 are consistent with the molding target parameters;
in this step, the shaped workpiece 3 is mainly brought into contact with the target terminal 1 via the cavity rail, and the cavity rail has a structure having a corresponding shape and a size of the molding target parameter, so that the molding segment 11 of the target terminal 1 can be guided and bent in the cavity rail at the time of press contact.
Step S400, fixing the target terminal 1, positioning the molding section 11 of the target terminal 1 in one molding cavity 9 of the mold, and pressing down the manufactured shaping workpiece 3 to guide and mold the molding section 11 of the target terminal 1 in a cavity guide rail of the shaping workpiece.
In this step, the target terminal 1 is in a fixed state during the shaping process, while its shaping section 11 is located in the shaping cavity 9 and is pressed down and guided to be shaped by the shaping workpiece 3. In a specific implementation, the movement of the shaping workpiece 3 may be achieved by a longitudinal clamping action, or may be achieved by a separate driving mechanism, without limitation.
Step S500, after the molding section 11 is molded, in-mold injection molding is performed.
In this step, the shaped workpiece 3 also serves as a component for shaping the target part and together with the shaping cavity 9, a corresponding part product is formed by injection molding.
Through the technical scheme, the terminal is subjected to in-mold shaping by adopting the novel in-mold shaping method, so that shaping difficulty can be reduced, working procedures are simplified, shaping and injection molding efficiency can be improved, and cost is reduced.
In one embodiment, the step S300 specifically includes the following steps:
step S310: calculating a bending radius R1 of the first arc-shaped section 111 according to a formula R1=8×a×b×c×d×E, calculating a bending radius R2 of the second arc-shaped section 112 according to a formula R2=R1, calculating a center distance E between the center of the first arc-shaped section 111 and the axis of the target terminal 1 according to a formula e=4×b×c×E, and calculating a center distance h between the center of the first arc-shaped section 111 and the center of the second arc-shaped section 112 according to a formula h=1.8e, wherein a is the tensile strength of the material of the target terminal 1, b is the tensile rate of the material of the target terminal 1, c is the diameter d of the target terminal 1 and is the length of the target terminal 1;
in this step, according to the original molding parameters and the predetermined post-shaping displacement dimension E and post-shaping height F, and according to the material properties of the terminal, the target parameters, that is, R1, R2, E, and h, which accurately meet the requirements of the material and the product can be obtained through the above formula, so that the cavity guide rail satisfying the shape of the post-shaping displacement dimension E and post-shaping height F can be conveniently designed, and thus the shaped workpiece 3 can be manufactured.
Step S320: based on the obtained molding target parameters, a shaped workpiece 3 having a cavity rail corresponding to the molding target parameters is designed and manufactured.
In the step, the shaping workpiece 3 corresponding to the cavity guide rail structure can be manufactured through the obtained parameters of R1, R2, e and h, so that the manufacturing is more accurate, the requirements are met, the actual production is guided more greatly, the corresponding shaping size can be calculated quickly through a formula, and the working procedures are simplified. The shaping workpiece 3 matched with the target terminal 1 can be manufactured through a calculation formula obtained based on the size, the material characteristics and the actual manufacturing of the terminal, the shaping workpiece 3 can be contacted and pressed with the target terminal 1 during die assembly, the shaping section 11 of the target terminal 1 can be shaped into a target shape under the guidance of a cavity guide rail, and the product shaping efficiency is greatly improved.
Further, in an embodiment of the present application, step S400 includes the steps of:
step S410: an adaptive die is provided, the die is provided with an upper die 4 and a lower die 5 which can be separated, at least one forming cavity 9 is formed by enclosing between the lower die 5 and the upper die 4, a mounting hole 102 is formed at the top of the upper die 4 corresponding to the forming cavity 9, and the shaping workpiece 3 is mounted in the mounting hole 102.
In this step, injection molding is performed by a mold and shaping is performed in the mold, injection molding is performed in the molding cavity 9 formed by the upper mold 4 and the lower mold 5, since the target terminal 1 is to be combined with the injection molded portion, the shaping work 3 is mounted in the mounting hole 102 of the upper mold 4 so that the shaping work 3 can move with the movement of the upper mold 4, and the portion of the shaping work 3 that protrudes into the molding cavity 9 also serves as one of the constituent parts of the molding cavity 9.
Step S420: the target terminal 1 is implanted to a predetermined position of the lower die 5 such that the target terminal 1 is fixed and the molding segment 11 is located in the molding cavity 9.
In this step, the target terminal 1 is implanted at a predetermined position of the lower die 5 before the die is closed, and the target terminal 1 is fixed and the molding section 11 is located in the molding cavity 9, so that only the molding section 11 is located in the molding cavity 9 to combine the portion with the injection molded body 2, and a part product having the target terminal 1 is molded.
Step S430: the upper die 4 performs a die closing operation and drives the shaping workpiece 3 to move toward the target terminal 1 implanted in the lower die 5, so that the cavity guide rail of the shaping workpiece 3 is in contact with the shaping end of the target terminal 1, and the shaping section 11 is gradually pressed in the cavity guide rail and guided to be shaped into a target shape.
In this step, the shaping force of the shaping work 3 is provided by the clamping operation of the upper die 4 and moves along with the movement of the upper die, so that the shaping work 3 can be gradually brought into contact with the shaping segment 11 of the target terminal 1 through the cavity rail extending from the bottom to the side during the clamping operation, and can be gradually pressed and shaped into the target shape after being gradually pressed and guided by the cavity rail. The shaping driving mode greatly simplifies the die structure, avoids the need of additionally arranging a corresponding driving device or driving structure, and reduces the cost.
In the embodiment of the application, the target shape further has a straight line segment 113, the straight line segment 113 is parallel to the axial direction of the target terminal 1 before molding, correspondingly, the molding target parameters further include a vertical height f from the end surface of the straight line segment 113 to the center of the first arc segment 111 and a vertical height g from the end surface of the straight line segment 113 to the center of the second arc segment 112, and the cavity guide rail further has a straight guide rail segment 32 adapted to the straight line segment 113. The first arc-shaped section 111 and the second arc-shaped section 112 serve as main shaping positions, and the straight line section 113 is driven to be displaced. In the embodiment of the application, the heights are all referenced by taking the end face of the top end of the straight line segment as the coordinate center, so that f and g are calculated from the end face of the straight line segment 113, the coordinate positions of the first arc segment 111 and the second arc segment 112 can be conveniently determined, and the corresponding cavity guide rail can be conveniently and accurately designed.
Of course, step S300 further includes the steps of:
step S301: the vertical height F from the end face of the straight line segment 113 to the center of the first arc segment 111 is calculated according to the formula f=12×b×c×f. In this step, F is the vertical height from the end surface of the straight line segment 113 to the center of the first arc segment 111, and accurate parameter data which is adaptive to the material and meets the relevant requirements can be calculated based on the material stretching rate b, the terminal diameter c and the predetermined post-shaping height F.
Step S302: according to the formula g=f, the vertical height g from the end face of the straight line segment 113 to the center of the second arc segment 112 is calculated.
In order to better shape and guide the straight line segment 113, the inner wall of the mounting hole 102 is correspondingly provided with a chute 101 on the cavity guide rail of the shaping workpiece 3, the chute 101 has the same structure as the cavity guide rail and can enclose a circular cavity matched with the straight line segment 113, and the bottom end of the circular cavity is communicated with the forming cavity 9 and forms a guiding inlet for the straight line end of the target terminal 1 to enter.
The cavity guide rail is of a semicircular guide groove structure, and the corresponding chute 101 is of a semicircular guide groove structure, so that the two guide grooves are spliced to form a circular cavity structure for the straight line segment 113 of the target terminal 1 to enter, and the straight line segment 113 can be gradually guided into the circular cavity after being contacted with the cavity guide rail of the shaping workpiece 3 through a formed guide inlet, so that shaping of the shaping segment 11 can be facilitated, and shaping can be accurate.
Furthermore, in order to enable the shaping operation and the mold clamping operation of the shaping workpiece 3 to be buffered for more stable shaping, the mounting hole 102 is formed in the shaping block 10, the bottom of the shaping block 10 is provided with a shaping surface for forming the shaping cavity 9, the shaping block 10 is longitudinally movably connected with the upper mold 4, the shaping workpiece 3 is slidably matched with the mounting hole 102, the top end of the shaping workpiece 3 penetrates through the mounting hole 102 to be fixedly connected with the upper mold 4, and a buffer spring 7 is arranged between the shaping block 10 and the upper mold 4.
Specifically, the target terminal 1 further has a fixing section 12, the diameter of the fixing section 12 is larger than that of the molding section 11, and the bottom of the molding cavity 9 has a jack 61 for inserting the fixing section 12. The target terminal 1 can be inserted into the jack 61 of the lower die 5 through the fixing section 12 to realize fixation, and a thimble is further arranged in the jack 61 so as to eject a product. The forming block 10 is communicated with the forming seat 6 below to form a forming cavity 9, and the forming seat 6, the forming block 10, the buffer spring 7, the forming workpiece 3, the ejector pin and the like form an in-mold shaping floating ejection forming mechanism.
In a specific implementation process, the molding cavity 9 is used for molding a molded part with a plurality of target terminals 1, a plurality of concave grooves are distributed on the molded part along the circumferential direction, and each concave groove is provided with a molded terminal in a penetrating way. The molded part has four terminals and is located at the concave grooves, respectively. One mold may be provided with at least two molding cavities 9, and four molds as shown in fig. 5 may be provided to shape terminals of 16 parts in total.
Finally, it should be noted that: the foregoing description is only of the preferred embodiments of the application and is not intended to limit the scope of the application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (8)
1. An in-mold terminal forming method is characterized in that: the method comprises the following steps:
providing at least one target terminal to be molded, wherein the target terminal is provided with at least a molding section for molding into a target shape, the molding section is provided with molding original parameters, the molding original parameters at least comprise the diameter c of the target terminal and the length d of the target terminal, the target shape is provided with at least a first arc-shaped section and a second arc-shaped section, the first arc-shaped section and the second arc-shaped section are in smooth transition and jointly form an S-shaped molding structure, and the molding structure is provided with a post-shaping displacement dimension E and a post-shaping height F;
according to the original molding parameters of the target terminal molding section, the given post-shaping displacement dimension E and the post-shaping height F, molding target parameters which are matched with the target shape are obtained through calculation, wherein the molding target parameters at least comprise the bending radius R1 of the first arc-shaped section, the bending radius R2 of the second arc-shaped section, the center distance E between the center of the first arc-shaped section and the axis of the target terminal and the center distance h between the center of the first arc-shaped section and the center of the second arc-shaped section;
based on the calculated molding target parameters, a shaping workpiece with a cavity guide rail is manufactured, the shape of the cavity guide rail of the shaping workpiece is matched with the target shape, and the corresponding parameters of the cavity guide rail are consistent with the molding target parameters;
fixing the target terminal, enabling the forming section of the target terminal to be positioned in a forming cavity of a die, and enabling the forming section of the target terminal to be guided and formed in a cavity guide rail of the forming section by pressing down the manufactured shaping workpiece;
and (5) carrying out in-mold injection molding after the molding section is molded.
2. The terminal in-mold molding method according to claim 1, wherein: based on the calculated molding target parameters, manufacturing a shaping workpiece with a cavity guide rail, wherein the shape of the cavity guide rail of the shaping workpiece is matched with the target shape, and the corresponding parameters of the cavity guide rail are consistent with the molding target parameters, and the method comprises the following steps:
calculating a bending radius R1 of the first arc section according to a formula R1=8×a×b×c×d×E, calculating a bending radius R2 of the second arc section according to a formula R2=R1, calculating a center distance E between the center of the first arc section and the axis of the target terminal according to a formula e=4×b×c×E, and calculating a center distance h between the center of the first arc section and the center of the second arc section according to a formula h=1.8e, wherein a is the material tensile strength of the target terminal, b is the material tensile rate of the target terminal, c is the diameter of the target terminal, and d is the length of the target terminal;
and designing and manufacturing the shaping workpiece with the cavity guide rail consistent with the molding target parameters according to the obtained molding target parameters.
3. The terminal in-mold molding method according to claim 1 or 2, characterized in that: the step of fixing the target terminal and enabling the forming section of the target terminal to be positioned in a forming cavity of a die, and enabling the forming section of the target terminal to be guided and formed in a cavity guide rail of the target terminal by pressing down the manufactured shaping workpiece, and the method comprises the following steps of:
providing an adaptive die, wherein the die is provided with a separable upper die and a separable lower die, at least one forming cavity is formed by enclosing the lower die and the upper die, a mounting hole is formed in the top of the upper die corresponding to the forming cavity, and a shaping workpiece is mounted in the mounting hole;
implanting the target terminal into a preset position of the lower die to fix the target terminal and enable the forming section to be positioned in the forming cavity;
the upper die performs die closing action and drives the shaping workpiece to move towards the direction of a target terminal implanted into the lower die so as to enable a cavity guide rail of the shaping workpiece to be in contact with a forming end of the target terminal, and the forming section is gradually pressed in the cavity guide rail and guided to be formed into a target shape.
4. A terminal in-mold molding method according to claim 3, wherein: the molding target parameters also comprise the vertical height f from the end surface of the straight line segment to the center of the first arc segment and the vertical height g from the end surface of the straight line segment to the center of the second arc segment, and the cavity guide rail is also provided with a linear guide rail segment matched with the straight line segment;
based on the calculated molding target parameters, manufacturing a shaping workpiece with a cavity guide rail, wherein the shape of the cavity guide rail of the shaping workpiece is matched with the target shape, and the corresponding parameters of the cavity guide rail are consistent with the molding target parameters, and the method further comprises the following steps:
calculating to obtain the vertical height F from the end face of the straight line segment to the center of the first arc segment according to the formula f=12×b×c×f;
and calculating the vertical height g from the end face of the straight line segment to the center of the second arc segment according to the formula g=f.
5. The in-mold terminal forming method according to claim 4, wherein: the inner wall of the mounting hole is correspondingly provided with a sliding groove which is arranged on a cavity guide rail of the shaping workpiece, the sliding groove is identical to the cavity guide rail in structure and can enclose to form a circular cavity matched with the straight line section, and the bottom end of the circular cavity is communicated with the forming cavity and forms a guide inlet for the linear end of the target terminal to enter.
6. The terminal in-mold molding method according to claim 5, wherein: the mounting hole is formed in a forming block, a forming surface for forming the forming cavity is formed at the bottom of the forming block, the forming block is longitudinally movably connected with the upper die, the forming workpiece is in sliding fit with the mounting hole, the top end of the forming workpiece penetrates out of the mounting hole to be fixedly connected with the upper die, and a buffer spring is arranged between the forming block and the upper die.
7. The terminal in-mold molding method according to claim 6, wherein: the target terminal is also provided with a fixed section, the diameter of the fixed section is larger than that of the forming section, and the bottom of the forming cavity is provided with a jack for inserting the fixed section.
8. The terminal in-mold molding method according to claim 1, wherein: the molding cavity is used for molding a molding part with a plurality of target terminals, a plurality of concave grooves are distributed on the molding part along the circumferential direction, and the molded terminals are arranged in each concave groove in a penetrating mode.
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| CN202311483520.8A CN117207442A (en) | 2023-11-09 | 2023-11-09 | Terminal in-mold forming method |
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| CN202311483520.8A CN117207442A (en) | 2023-11-09 | 2023-11-09 | Terminal in-mold forming method |
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