Front mold for multi-plate demolding and injection mold
By adding the design of connecting plates and limit components in the injection mold, the problem of interference between the molded insert and the shunt channel layout is solved, and a more flexible shunt channel layout and a more efficient glue injection process are achieved, which improves product quality.
Patent Information
- Application Number
- CN202420216457.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-01-30
- Publication Date
- 2024-12-13
- Estimated Expiration
- 2034-01-30
AI Technical Summary
In injection molds, as the product structure becomes more complex, the layout of the molded inserts and the diversion channel will interfere, resulting in limited layout of the diversion channel, increasing the glue usage and glue injection time, affecting the product molding quality.
Design a front mold for multi-plate demolding. By adding a connecting plate, the diversion channel is formed between the first connecting plate and the second connecting plate, and the molded insert is fixed to the rear side of the second connecting plate to avoid diversion. The channel and the forming insert are on the same floor, with a stroke limit assembly and push assembly to limit maximum spacing and push the core pulling of the forming insert.
It effectively reduces the length limit of the diversion channel, reduces the amount of glue and the duration of glue injection, and improves the molding quality of injection molded products.
Smart Images
Figure CN222156441U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of injection molds, in particular to a front mold for multi-plate demoulding and an injection mold. Background Art
[0002] Injection molds are tools for producing plastic products; they are also tools that give plastic products a complete structure and precise dimensions. Injection molding is a processing method used in mass production of certain parts with complex shapes. Specifically, it refers to the process of injecting heated and melted plastic into the mold cavity under high pressure by an injection molding machine, and then cooling and solidifying to obtain a molded product.
[0003] The injection mold consists of a front mold and a back mold. The front mold is used as a fixed mold and is equipped with a glue inlet channel, and the back mold is used as a movable mold. The front mold generally includes a fixed plate, a connecting plate and a front mold plate stacked from front to back. The fixed plate is equipped with a gate sleeve, and a shunt channel connecting the gate sleeve is formed between the connecting plate and the front mold plate. However, as the structure of injection molded products becomes more and more complex, the number of parts of the injection mold is also increasing. One of the structures is that when it is necessary to add a molding insert for inserting into the cavity in the front mold, the molding insert is generally fixed on the connecting plate, so that it is on the same layer as the shunt channel. If the number of molding inserts and shunt channels increases, the layout positions of the two will interfere with each other. The position of the molding insert cannot be changed, and only the position of the shunt channel can be changed. For example, the shunt channel bypasses the molding insert from one side to the other side, which causes the length of the shunt channel to increase significantly. In this way, the layout of the shunt channel is greatly restricted, and the amount of glue and the injection time will increase, and even affect the molding quality of the product. Utility Model Content
[0004] Therefore, in order to solve the above problems, the utility model provides a front mold and an injection mold for multi-plate demoulding.
[0005] To achieve the above purpose, the technical solution provided by the utility model is as follows:
[0006] A front mold for multi-plate demolding, comprising a fixed plate, a first connecting plate, a second connecting plate and a front mold plate stacked in sequence from front to back, the front mold core being connected to the front mold core, a gate sleeve being arranged between the fixed plate and the first connecting plate, the rear side of the first connecting plate and the front side of the second connecting plate constituting a diversion channel connecting the gate sleeve, and the second connecting plate and the front mold core being provided with a feed channel connecting the diversion channel; a molding insert being fixed to the rear side of the second connecting plate, the molding insert being inserted into the front mold core.
[0007] Furthermore, a plurality of the molding inserts are provided and fixed at intervals on the rear side of the second connecting plate, and the feed channel is located on the outside of the molding insert and / or between two adjacent molding inserts.
[0008] Furthermore, the gate sleeve is fixed on the fixed plate.
[0009] Furthermore, a sprue stripping needle is fixed on the fixed plate and / or the sprue sleeve, and the sprue stripping needle passes through the first connecting plate and extends into the diversion channel.
[0010] Furthermore, the end of the sprue stripping needle extending into the diversion channel forms an inverted cone structure that is narrow in the front and wide in the back.
[0011] Furthermore, it also includes a travel limit assembly, which limits the maximum distance between the fixed plate and the first connecting plate and the maximum distance between the first connecting plate and the front template.
[0012] Furthermore, the travel limit assembly includes a first limit pin and a second limit pin, and the fixed plate, the first connecting plate, the second connecting plate and the front template are provided with corresponding through holes, the first limit pin is penetrated through the through holes of the fixed plate and the first connecting plate, the second limit pin is penetrated through the through holes of the front template and the second connecting plate and is connected to the first limit pin, the front end of the second limit pin is against the first connecting plate, the front end of the first limit pin is sleeved with a limit sleeve, the limit sleeve has a limit boss, the inner wall of the through hole of the fixed plate is provided with a first step corresponding to the limit boss; the rear end of the second limit pin is provided with a limit end cap, and the inner wall of the through hole of the front template is provided with a second step corresponding to the limit end cap.
[0013] Furthermore, a pushing component is also provided on the front template, and the pushing component acts on the second connecting plate to apply a forward thrust to the second connecting plate.
[0014] Furthermore, the pushing assembly includes a third limiting pin, a spring and a push plate, the rear end of the spring abuts against the front template, and the front end of the spring abuts against the push plate; the push plate abuts against the second connecting plate; the rear end of the third limiting pin is fixed on the front template, and the front end is provided with an end cap for limiting the push plate.
[0015] An injection mold comprises a front mold and a rear mold, wherein the front mold is the multi-plate demoulding front mold described above.
[0016] The technical solution provided by the utility model has the following beneficial effects:
[0017] By adding a connecting plate to the front mold, a diverter channel is formed between the first connecting plate and the second connecting plate, and the molding insert is fixed to the rear side of the second connecting plate, so that the diverter channel and the molding insert are not on the same layer and do not affect each other; compared with the method of the diverter channel bypassing the molding insert in the prior art, the layout of the diverter channel is not restricted, and the amount of glue used and the injection time are effectively reduced, and the quality of the injection molded products is effectively guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 The figure shows the appearance of the injection mold in the embodiment;
[0019] Figure 2 The figure shows a partial structural exploded schematic diagram of the injection mold in the embodiment;
[0020] Figure 3 Shown is a cross-sectional view of the front mold for multi-plate demoulding in an embodiment Figure 1 ;
[0021] Figure 4 Shown Figure 3 A magnified schematic diagram of the middle A area;
[0022] Figure 5 Shown is a cross-sectional view of the front mold for multi-plate demoulding in an embodiment Figure 2 ;
[0023] Figure 6 Shown is a cross-sectional view of an injection mold in an embodiment;
[0024] Figure 7 Shown Figure 6 A magnified schematic diagram of area B. DETAILED DESCRIPTION
[0025] To further illustrate the various embodiments, the present invention provides drawings. These drawings are part of the disclosure of the present invention, which are mainly used to illustrate the embodiments and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these contents, a person of ordinary skill in the art should be able to understand other possible implementations and advantages of the present invention. The components in the figures are not drawn to scale, and similar component symbols are generally used to represent similar components.
[0026] The utility model is now further described in conjunction with the accompanying drawings and specific implementation methods.
[0027] Reference Figures 1 to 7 As shown, a front mold for multi-plate demoulding provided in this embodiment includes a fixed plate 11, a first connecting plate 12, a second connecting plate 13 and a front mold plate 14 stacked in sequence from front to back, a front mold core 30 is connected to the front mold plate 14, a sprue bushing 15 is arranged between the fixed plate 11 and the first connecting plate 12, a shunt channel 16 connected to the sprue bushing 15 is formed at the rear side of the first connecting plate 12 and the front side of the second connecting plate 13, and a feed channel 17 connected to the shunt channel 16 is provided at the second connecting plate 13 and the front mold core 14; the sprue bushing 15, the shunt channel 16 and the feed channel 17 together form a glue injection channel. A molding insert 20 is fixed to the rear side of the second connecting plate 13, and the molding insert 20 is inserted into the front mold core 30.
[0028] The front mold for multi-plate demoulding provided in this embodiment adds a connecting plate structure on the existing basis, so that the diverter channel 16 and the molding insert 20 are not in the same layer and do not affect each other; compared with the method of bypassing the molding insert 20 in the prior art, the layout of the diverter channel 16 is not restricted, and the amount of glue and the injection time are effectively reduced, and the quality of the injection molded product is effectively guaranteed. It should be noted that the injection channel of this solution is only equivalent to the length of the thickness of a connecting plate, which has basically no effect on the injection molding of the product.
[0029] Specifically, in this embodiment, three molding inserts 20 are provided and fixed at intervals on the rear side of the second connecting plate 13. In order to feed the glue more evenly, the feeding channels 17 also have multiple, specifically four, which are respectively located on the outside of the molding inserts 20 and between two adjacent molding inserts 20. Of course, in other embodiments, the number and position of the feeding channels 17 can be designed according to actual conditions.
[0030] The sprue sleeve 15 is fixed on the fixed plate 11, and a sprue stripping needle 41 is fixed on both the fixed plate 11 and the sprue sleeve 15. The sprue stripping needle 41 passes through the first connecting plate 12 and extends into the diverter channel 16. With the arrangement of the sprue stripping needle 41, when the first connecting plate 12 and the second connecting plate 13 are separated, the sprue material 1 solidified in the diverter channel 16 and the feed channel 17 can be fixed on the sprue stripping needle 41 and moved out of the diverter channel 16 and the feed channel 17 together with the sprue stripping needle 41.
[0031] Specifically, the end 42 of the sprue stripping needle 41 extending into the diverter channel 16 forms an inverted cone structure that is narrow in front and wide in the back; with this arrangement, the sprue stripping needle 41 is more firmly combined with the sprue material 1, and the sprue material 1 can be better separated from the diverter channel 16 and the feed channel 17.
[0032] In this embodiment, the front mold further includes a travel limit assembly, which limits the maximum distance between the fixed plate 11 and the first connecting plate 12 and the maximum distance between the first connecting plate 12 and the front mold plate 14 .
[0033] Specifically, the travel limit assembly includes a first limit nail 61 and a second limit nail 62. The fixed plate 11, the first connecting plate 12, the second connecting plate 13 and the front template 14 are provided with corresponding through holes. The first limit nail 61 is penetrated through the through hole of the fixed plate 11 and the through hole of the first connecting plate 12. The second limit nail 62 is penetrated through the through hole of the front template 14 and the through hole of the second connecting plate 13 and connected to the first limit nail 61. The front end of the second limit nail 62 is pressed against the first connecting plate 12. A limiting sleeve 63 is sleeved on the front end of the first limiting nail 61, and the limiting sleeve 63 has a limiting boss 631. The inner wall of the through hole of the fixed plate 11 is provided with a first step 111 corresponding to the limiting boss 631; when the fixed plate 11 and the first connecting plate 12 are separated by a certain distance, the limiting boss 631 of the limiting sleeve 63 abuts against the first step 111 of the fixed plate 11, thereby limiting the further separation of the fixed plate 11 and the first connecting plate 12, so as to limit the maximum distance between the fixed plate 11 and the first connecting plate 12. The rear end of the second limiting pin 62 is provided with a limiting end cap 621, and the inner wall of the through hole of the front template 14 is provided with a second step 141 corresponding to the limiting end cap 621. After the front template 14 is separated from the first connecting plate 12 for a distance, the limiting end cap 621 of the second limiting pin 62 abuts against the second step 141 of the front template 14, thereby limiting the front template 14 and the first connecting plate 12 from further separation, so as to limit the maximum distance between the first connecting plate 12 and the front template 14. Of course, in other embodiments, the structure of the travel limiting assembly is not limited to this, and other limiting structures may also be used instead.
[0034] The front template 14 is also provided with a pushing component 50, which acts on the second connecting plate 13 to apply a forward thrust to the second connecting plate 13. The setting of the pushing component 50 can separate the front template 14 and the second connecting plate 13 in the first time when the mold is opened, so as to realize the core pulling of the molding insert 20.
[0035] Specifically, the push assembly 50 includes a third limiting nail 51, a spring 53 and a push piece 52, wherein the rear end of the spring 53 abuts on the front template 14, and the front end thereof abuts on the push piece 52; the push piece 52 abuts on the second connecting plate 13; the rear end of the third limiting nail 51 is fixed on the front template 14, and the front end thereof is provided with an end cap 511 for limiting the push piece 52. When the mold is opened, the front template 14 and the second connecting plate 14 are separated by the elastic force of the spring 53, and then the molding insert 20 is pulled out of the injection cavity to achieve separation from the injection molded product. When the front template 14 and the second connecting plate 13 are separated for a distance, the push piece 52 is limited by the end cap 511 of the third limiting nail 51, that is, the second connecting plate 13 is no longer subjected to elastic force. Specifically, the third limiting nail 51 is inserted into the spring 53 and the push piece 52, and also plays a role in fixing the spring 53 and the push piece 52. Of course, in other embodiments, the structure of the push assembly 50 is not limited to this, and other structures can also be used instead.
[0036] This embodiment provides an injection mold, including a front mold 100 and a rear mold 200. Specifically, the front mold 100 is the multi-plate demoulding front mold described above.
[0037] One of the preferred mold opening steps of the injection mold is as follows: the rear mold 200 starts to move backwards, and under the action of the pushing assembly 50, the front mold plate 14 and the second connecting plate 13 are first separated to realize the core pulling of the molding insert 20; then, the first connecting plate 12 and the second connecting plate 13 start to separate to realize the separation of the sprue material 1. When the sprue material 1 is completely pulled out, the limiting end cap 621 of the second limiting pin 62 abuts against the second step 141 of the front mold plate 14, thereby limiting the maximum distance between the front mold plate 14 and the first connecting plate 12. Then, the fixing plate 11 and the first connecting plate 12 start to separate, so that the sprue stripping needle 41 is separated from the sprue material 1, and the sprue material 1 is removed. Finally, the rear mold 200 continues to move backward to separate the rear mold 200 from the front mold 100, and finally the product is ejected to realize the demolding of the product.
[0038] Although the present invention has been specifically demonstrated and described in conjunction with the preferred embodiments, those skilled in the art should understand that various changes may be made to the present invention in form and detail without departing from the spirit and scope of the present invention as defined in the appended claims, all of which are within the scope of protection of the present invention.
Claims
1. A front mold for multi-plate demoulding, characterized in that: It includes a fixed plate, a first connecting plate, a second connecting plate and a front mold plate which are stacked in sequence from front to back, the front mold core is connected to the front mold core, a gate sleeve is arranged between the fixed plate and the first connecting plate, the rear side of the first connecting plate and the front side of the second connecting plate constitute a diversion channel connected to the gate sleeve, and the second connecting plate and the front mold core are provided with a feed channel connecting the diversion channel; a molding insert is fixed to the rear side of the second connecting plate, and the molding insert is inserted in the front mold core.
2. The front mold for multi-plate demoulding according to claim 1, characterized in that: A plurality of molding inserts are provided and fixed at intervals on the rear side of the second connecting plate. The feed channel is located outside the molding insert and / or between two adjacent molding inserts.
3. The front mold for multi-plate demoulding according to claim 1, characterized in that: The gate sleeve is fixed on the fixing plate.
4. The front mold for multi-plate demoulding according to claim 1 or 3, characterized in that: A sprue stripping needle is fixed on the fixed plate and / or the sprue sleeve, and the sprue stripping needle passes through the first connecting plate and extends into the diversion channel.
5. The front mold for multi-plate demoulding according to claim 4, characterized in that: The end of the sprue stripping needle extending into the diversion channel forms an inverted cone structure that is narrow in front and wide in the back.
6. The front mold for multi-plate demoulding according to claim 1, characterized in that: It also includes a travel limit assembly, which limits the maximum distance between the fixed plate and the first connecting plate and the maximum distance between the first connecting plate and the front template.
7. The front mold for multi-plate demoulding according to claim 6, characterized in that: The travel limit assembly includes a first limit pin and a second limit pin, and the fixed plate, the first connecting plate, the second connecting plate and the front template are provided with corresponding through holes, the first limit pin is penetrated through the through holes of the fixed plate and the first connecting plate, the second limit pin is penetrated through the through holes of the front template and the through holes of the second connecting plate and is connected to the first limit pin, the front end of the second limit pin is against the first connecting plate, the front end of the first limit pin is sleeved with a limit sleeve, the limit sleeve has a limit boss, the inner wall of the through hole of the fixed plate is provided with a first step corresponding to the limit boss; the rear end of the second limit pin is provided with a limit end cap, and the inner wall of the through hole of the front template is provided with a second step corresponding to the limit end cap.
8. The front mold for multi-plate demoulding according to claim 1, characterized in that: The front template is also provided with a pushing component, and the pushing component acts on the second connecting plate to apply a forward pushing force to the second connecting plate.
9. The front mold for multi-plate demoulding according to claim 8, characterized in that: The pushing assembly includes a third limiting pin, a spring and a push plate, the rear end of the spring abuts against the front template, and the front end of the spring abuts against the push plate; the push plate abuts against the second connecting plate; the rear end of the third limiting pin is fixed on the front template, and the front end is provided with an end cap for limiting the push plate.
10. An injection mold, comprising a front mold and a rear mold, characterized in that: The front mold is the front mold for multi-plate demoulding according to any one of claims 1 to 9.