Plastic pressing mold

Abstract

The utility model relates to a plastic pressing die which comprises a bottom plate, a pressing plate, an annular baffle and a positioning strip. An annular groove is formed in the upper surface, close to the pressing plate, of the bottom plate, one end of the annular baffle is connected with the annular groove, and the positioning strip is arranged on the upper surface of the bottom plate and makes contact with the inner wall of the annular baffle. The positioning strips define a forming cavity for plastic pressing, and the pressing plate makes contact with the upper surfaces of the positioning strips so as to press plastic in the forming cavity. The press-fit die can ensure the uniformity of the thickness of a pressed and molded product.

Description

Technical Field

[0001] The utility model relates to the technical field of pressing moulds, in particular to a plastic pressing mould. Background Art

[0002] At present, the most common processing method for fluoroplastics is the pressing method, which mainly uses a press to apply pressure to the fluoroplastic raw materials in the mold cavity and then take out the finished product. Figure 3 ) Although the plastic can be pressed into shape, the pressing thickness cannot be controlled, resulting in large thickness differences in the molded products, affecting the molding quality of the products.

[0003] The prior art CN201821835460.6 discloses a plastic mold, comprising: an upper mold and a lower mold, the upper mold is provided with a protrusion structure, and the lower mold is provided with a groove structure used in conjunction with the protrusion structure; the upper mold is provided with a guide rod, and the lower mold is provided with a blind hole used in conjunction with the guide rod; the side wall of the lower mold is provided with a cooling channel for accommodating a cooling medium, and the cooling channel is spirally arranged on the side wall of the lower mold.

[0004] The plastic module disclosed in the prior art is formed by providing a molding groove on the lower mold and a protrusion on the upper mold that matches the groove, and using the protrusion to press the plastic in the groove to achieve compression molding. However, it also has the problem of thickness difference of the product after pressing. Utility Model Content

[0005] The technical problem solved by the utility model is to overcome the problems existing in the prior art and provide a plastic pressing mold which can reduce the thickness difference of the product after pressing and ensure the uniform thickness of the product.

[0006] The purpose of the utility model is achieved through the following technical solutions:

[0007] Disclosed is a plastic pressing mold, comprising a base plate, a pressing plate, an annular baffle and a positioning strip; an annular groove is arranged on the upper surface of the base plate adjacent to the pressing plate, one end of the annular baffle is connected to the annular groove, the positioning strip is arranged on the upper surface of the base plate and contacts the inner wall of the annular baffle; the positioning strip encloses a molding cavity for plastic pressing, and the pressing plate contacts the upper surface of the positioning strip to press the plastic in the molding cavity.

[0008] Preferably, the annular groove is an annular square groove.

[0009] Preferably, the annular baffle is composed of four baffles corresponding to the annular square grooves.

[0010] Preferably, a boss is provided at one end of the annular baffle, and the boss is clearance-matched with the annular groove.

[0011] Preferably, the annular baffle is fixedly connected to the bottom plate by screws.

[0012] Preferably, the positioning bar is a square rod.

[0013] Preferably, both ends of the direction rod are provided with angle trimming.

[0014] Preferably, a groove is provided on the bottom of the pressing plate adjacent to the positioning strip.

[0015] Preferably, the thickness of the pressing plate is greater than the height difference between the annular baffle and the positioning bar.

[0016] Preferably, the annular baffle is provided with a threaded hole for installing a temperature measuring probe.

[0017] Compared with the prior art, it has the following beneficial effects:

[0018] 1) The blocking force of the annular baffle plate enables the positioning strip to form a stable molding cavity. During pressing, the pressing plate is located between the annular grooves and is pressed on the upper surface of the positioning strip. The thickness of the final molded product is fixed to the thickness of the positioning strip, thereby ensuring that the thickness of the product is consistent after each pressing.

[0019] 2) By replacing positioning strips of different thicknesses, the processing of products of the same shape but different thicknesses can be achieved.

[0020] 3) Added material temperature measurement and real-time monitoring, making the process more stable.

[0021] 4) Remove the baffle on one side to make it easier to take out the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a side view of a plastic pressing mold of the utility model;

[0023] Figure 2 This is a top view of a plastic pressing mold of the utility model;

[0024] Figure 3 It is a schematic diagram of the mold structure of the prior art. DETAILED DESCRIPTION

[0025] In order to clearly illustrate the technical features of the present invention, the present invention is described in detail below through specific implementation methods and in conjunction with the accompanying drawings.

[0026] In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present application is not limited to the specific embodiments disclosed below.

[0027] In addition, in the description of the present application, it should be understood that the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential" and the like indicate positions or positional relationships based on the positions 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. In addition, the terms "first" and "second" are used only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0028] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like 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, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0029] In the present application, unless otherwise clearly specified and limited, a first feature "above" or "below" a second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in an appropriate manner in any one or more embodiments or examples.

[0030] Example 1

[0031] like Figures 1-2As shown, a plastic pressing mold is disclosed, including a base plate 1, a pressing plate 2, an annular baffle 3 and a positioning strip 4; an annular groove is provided on the upper surface of the base plate 1 adjacent to the pressing plate 2, one end of the annular baffle 3 is connected to the annular groove, and the positioning strip 4 is provided on the upper surface of the base plate 1 and contacts the inner wall of the annular baffle 3; the positioning strip 4 encloses a molding cavity for plastic pressing, and the pressing plate 2 contacts the upper surface of the positioning strip 4 to press the plastic in the molding cavity.

[0032] In this embodiment, the base plate 1 serves as a lower mold, which can be fixed to the ground or a punch press by bolts or the like. An annular groove is provided on the base plate 1, and the annular groove is specifically provided on the end face of the base plate 1 adjacent to the pressing plate 2, that is, the upper surface of the base plate 1. One end of the annular baffle 3 is connected to the annular groove, that is, the annular baffle 3 is connected to the base 1 through the annular groove. The positioning bar 4 is movably provided on the upper surface of the base plate 1 and contacts the inner wall of the annular baffle 3. The positioning bar 4 encloses a molding cavity for plastic pressing, and the plastic to be pressed is placed in the molding cavity. The pressing plate 2 (upper mold) moves toward the base plate under the external force of the cylinder or the like, and is pressed on the upper surface of the positioning bar 4. Under the pressure of the pressing plate 2, the plastic (fluoroplastic) in the molding cavity is deformed, thereby evenly filling the molding cavity, and finally realizing the pressing and molding of the plastic. During the pressing process, the positioning strip 4 contacts the outer wall of the annular baffle 3, that is, the size of the molding cavity formed by the positioning strip 4 is fixed, and the pressing plate 2 is pressed on the upper surface of the positioning strip 4, that is, during the pressing process, the distance between the pressing plate 2 and the bottom plate 1 is the height dimension of the positioning strip 4. When the height of the positioning strip 4 does not change, the height of the molding cavity is naturally fixed, thereby ensuring that the length, width and thickness dimensions of the pressed product are consistent.

[0033] At the same time, after the pressing and forming, the positioning strip 4 corresponding to the annular baffle 3 can be easily removed by removing at least one side of the annular baffle 3, so that the pressed product can be easily removed.

[0034] In this embodiment, a heating device such as a resistance wire may be added to the pressing plate 2 to increase the temperature of the pressing plate 2 through the heating device, thereby achieving hot pressing and improving the efficiency of plastic pressing and molding.

[0035] Example 2

[0036] Disclosed is a plastic pressing mold, comprising a base plate 1, a pressing plate 2, an annular baffle 3 and a positioning strip 4; an annular groove is provided on the upper surface of the base plate 1 adjacent to the pressing plate 2, one end of the annular baffle 3 is connected to the annular groove, the positioning strip 4 is provided on the upper surface of the base plate 1 and contacts the inner wall of the annular baffle 3; the positioning strip 4 encloses a molding cavity for plastic pressing, the pressing plate 2 contacts the upper surface of the positioning strip 4 to press the plastic in the molding cavity.

[0037] The difference between this embodiment and embodiment 1 is that the annular groove is an annular square groove. The annular groove is designed as an annular square groove. Naturally, the molding cavity formed by the positioning strip 4 is a square cavity, and the product after pressing and molding is a square block. Specifically, the annular baffle 3 includes four baffles, and the four baffles correspond to the annular square groove one by one.

[0038] Specifically, when the product after pressing needs to be circular, the contour of the annular groove is also circular.

[0039] Example 3

[0040] Disclosed is a plastic pressing mold, comprising a base plate 1, a pressing plate 2, an annular baffle 3 and a positioning strip 4; an annular groove is provided on the upper surface of the base plate 1 adjacent to the pressing plate 2, one end of the annular baffle 3 is connected to the annular groove, the positioning strip 4 is provided on the upper surface of the base plate 1 and contacts the inner wall of the annular baffle 3; the positioning strip 4 encloses a molding cavity for plastic pressing, the pressing plate 2 contacts the upper surface of the positioning strip 4 to press the plastic in the molding cavity.

[0041] The difference between this embodiment and the second embodiment is that in order to facilitate the connection between the annular baffle plate 3 and the annular groove, a boss can be provided at one end of the annular baffle plate 3, and the boss and the annular groove are clearance-matched.

[0042] In order to improve the connection stability between the annular baffle 3 and the base plate 1, the annular baffle 3 and the base plate 1 can also be connected by screws. Specifically, corresponding bolts can be arranged on the boss, and corresponding bolt holes can be arranged at the bottom of the annular groove.

[0043] Example 4

[0044] Disclosed is a plastic pressing mold, comprising a base plate 1, a pressing plate 2, an annular baffle 3 and a positioning strip 4; an annular groove is provided on the upper surface of the base plate 1 adjacent to the pressing plate 2, one end of the annular baffle 3 is connected to the annular groove, the positioning strip 4 is provided on the upper surface of the base plate 1 and contacts the inner wall of the annular baffle 3; the positioning strip 4 encloses a molding cavity for plastic pressing, the pressing plate 2 contacts the upper surface of the positioning strip 4 to press the plastic in the molding cavity.

[0045] The difference between this embodiment and the first embodiment is that the positioning strip 4 includes four square rods. The four square rods enclose a molding cavity. Specifically, a 45° angle can be made at both ends of each square rod, and adjacent square rods are connected by the angled bevel. In this embodiment, the positioning strip 4 can also be integrally formed.

[0046] In order to prevent the positioning strip 4 from being deformed by pressure, the positioning strip 4 can be made of metal material.

[0047] Example 5

[0048] Disclosed is a plastic pressing mold, comprising a base plate 1, a pressing plate 2, an annular baffle 3 and a positioning strip 4; an annular groove is provided on the upper surface of the base plate 1 adjacent to the pressing plate 2, one end of the annular baffle 3 is connected to the annular groove, the positioning strip 4 is provided on the upper surface of the base plate 1 and contacts the inner wall of the annular baffle 3; the positioning strip 4 encloses a molding cavity for plastic pressing, the pressing plate 2 contacts the upper surface of the positioning strip 4 to press the plastic in the molding cavity.

[0049] The difference between this embodiment and the first embodiment is that in order to improve the quality of the pressed product, exhaust is required during the pressing process. Therefore, a groove for exhaust is provided at the bottom of the pressing plate 2, that is, at the end of the pressing plate 2 adjacent to the positioning strip. When the pressing plate is pressed into a mold, the gas exhausted during the plastic compression process is discharged through the groove, thereby avoiding bubbles in the pressed product.

[0050] Example 6

[0051] Disclosed is a plastic pressing mold, comprising a base plate 1, a pressing plate 2, an annular baffle 3 and a positioning strip 4; an annular groove is provided on the upper surface of the base plate 1 adjacent to the pressing plate 2, one end of the annular baffle 3 is connected to the annular groove, the positioning strip 4 is provided on the upper surface of the base plate 1 and contacts the inner wall of the annular baffle 3; the positioning strip 4 encloses a molding cavity for plastic pressing, the pressing plate 2 contacts the upper surface of the positioning strip 4 to press the plastic in the molding cavity.

[0052] The difference between this embodiment and embodiment 1 is that the thickness of the pressing plate 2 is greater than the height difference between the annular baffle 3 and the positioning strip 4. Before pressing, the volume of the raw material is naturally larger than the volume after pressing and molding. Through this design, it is ensured that during the pressing process, the pressure of the pressing plate 2 can be fully applied to the raw material. Specifically, a threaded hole for installing a temperature probe is provided on the annular baffle 3, and a temperature probe for measuring the temperature of the pressing plate is installed in the threaded hole. Hot pressing is often used in the plastic pressing process. The pressing effect is different when the temperature of the pressing plate 2 is different. By monitoring the temperature of the pressing plate 2 in real time, the pressing quality is ensured and the pressing process is made more stable.

[0053] Example 7

[0054] Disclosed is a plastic pressing mold, comprising a base plate 1, a pressing plate 2, an annular baffle 3 and a positioning strip 4; an annular groove is provided on the upper surface of the base plate 1 adjacent to the pressing plate 2, one end of the annular baffle 3 is connected to the annular groove, the positioning strip 4 is provided on the upper surface of the base plate 1 and contacts the inner wall of the annular baffle 3; the positioning strip 4 encloses a molding cavity for plastic pressing, the pressing plate 2 contacts the upper surface of the positioning strip 4 to press the plastic in the molding cavity.

[0055] The difference between this embodiment and the above embodiment is that the pressing mold can be installed on a punch press, such as a mechanical punch press or a hydraulic punch press. The bottom plate 1 and the pressing plate 2 are fixedly connected to the punch press by means of screws, etc., and the pressing plate moves up and down under the action of the punch press. When the pressing plate moves downward, the plastic is pressed.

[0056] Obviously, the above embodiments are merely examples for clearly illustrating the technical solution of the utility model, and are not intended to limit the implementation methods of the utility model. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made on the basis of the above description. It is not necessary and impossible to list all the implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the utility model should be included in the protection scope of the claims of the utility model.

Claims

1. A plastic pressing mold, characterized in that: It includes a base plate, a pressure plate, an annular baffle and a positioning strip; an annular groove is arranged on the upper surface of the base plate adjacent to the pressure plate, one end of the annular baffle is connected to the annular groove, and the positioning strip is arranged on the upper surface of the base plate and contacts the inner wall of the annular baffle; the positioning strip encloses a molding cavity for plastic pressing, and the pressure plate contacts the upper surface of the positioning strip to press the plastic in the molding cavity.

2. A plastic pressing mold according to claim 1, characterized in that: The annular groove is an annular square groove.

3. A plastic pressing mold according to claim 2, characterized in that: The annular baffle is composed of four baffles corresponding to the annular square grooves.

4. A plastic pressing mold according to claim 2, characterized in that: A boss is provided at one end of the annular baffle, and the boss is clearance-matched with the annular groove.

5. The plastic pressing mold according to claim 1, characterized in that: The annular baffle is fixedly connected to the bottom plate by screws.

6. The plastic pressing mold according to claim 1, characterized in that: The positioning bar is a square rod.

7. A plastic pressing mold according to claim 6, characterized in that: Both ends of the square rod are provided with angle trimming.

8. The plastic pressing mold according to claim 1, characterized in that: A groove is arranged on the bottom of the pressing plate adjacent to the positioning strip.

9. The plastic pressing mold according to claim 1, characterized in that: The thickness of the pressing plate is greater than the height difference between the annular baffle and the positioning bar.

10. The plastic pressing mold according to claim 9, characterized in that: The annular baffle is provided with a threaded hole for installing a temperature measuring probe.

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