Thin-wall plastic ultrasonic welding mold

Abstract

The utility model discloses a thin-wall plastic ultrasonic welding die which comprises an upper die and a lower die, and the upper die is connected with an ultrasonic generator. The lower die comprises a bottom plate, a fixed lower die, a movable lower die, a push block and a driver, the driver is fixed to one end of the bottom plate, the fixed lower die is fixed to the other end of the bottom plate, the movable lower die is connected to the bottom plate in a linear movement mode and located between the driver and the fixed lower die, the driver is provided with an ejector rod, and the ejector rod is connected with one side of the movable lower die through the push block; a first female die cavity is formed in the other side of the movable lower die, a second female die cavity is formed in the side, opposite to the movable lower die, of the fixed lower die, the first female die cavity and the second female die cavity are matched to form a female die cavity for containing a lower shell of a product, and the side wall of the female die cavity is in gapless fit with the periphery of the lower shell of the product. By the adoption of the ultrasonic welding device, the lower shell cannot be bent outwards due to stress, the ultrasonic bonding lines in the shell cannot be bent inwards or deformed, and the ultrasonic welding stability is guaranteed.

Description

Technical Field

[0001] The utility model belongs to the technical field of ultrasonic welding, and in particular relates to a thin-wall plastic ultrasonic welding mould. Background Art

[0002] At present, ultrasonic welding is widely used in the welding between the upper cover and the lower shell of plastic products. The ultrasonic machine is used to generate vibration frequency, and the upper and lower shells are subjected to a certain pressure through the mold. The high-frequency friction generates heat, so that the contacting plastics melt and combine together in a molecular state. Therefore, the ultrasonic welding wave can have a bonding strength close to 80% to 90% of the material itself; at the same time, there is no need to add additional adhesives or screws to lock and fix. The operation is quick and convenient, while reducing costs, and can significantly improve the stability of product quality.

[0003] like Figure 1 As shown, the ultrasonic mold is generally divided into an upper mold head 1 and a lower mold head 2. The upper mold head 1 is used to receive the high-frequency vibration kinetic energy converted from the electrical energy of the main machine of the equipment and apply it to the upper cover 31 of the product; the lower mold head 2 is mainly used to position the lower shell 32 of the product and provide stable support. However, for thin-walled shell cover products (i.e., the ultrasonic welding surface step is less than 0.8mm), there is great difficulty in welding, and the strength of the ultrasonic bonding line is not strong. The main reason is that when the ultrasonic mold is manufactured, it is considered that it is convenient to take and place the lower shell of the product during production. The fit between the lower mold 2 and the lower shell of the product is a clearance fit, and the actual single-side gap θ is designed to be between 0.1 and 0.2mm. However, due to the interaction force in the welding area, this structure causes the lower shell to bend outward and deform, and the weld line in the shell bends inward and deviates, resulting in insufficient friction heat energy in the fusion area and unstable welding. Moreover, the product is prone to cracking defects in subsequent drop tests. Through disassembly and ultrasonic cross-section analysis, the main problem is that the local effect of the ultrasonic bonding line between the upper cover and the lower shell is poor. Due to the reaction force at the contact point, the end size strength is too weak, causing the ultrasonic bonding line to bend inward and deform, affecting the welding performance. Utility Model Content

[0004] The problem to be solved by the utility model is to provide a thin-walled plastic ultrasonic welding mold which can ensure the stability of ultrasonic welding by preventing the lower shell from bending outwards due to force and the ultrasonic bonding line in the shell from bending inwards.

[0005] In order to solve the above technical problems, the utility model provides a thin-wall plastic ultrasonic welding mold, which includes an upper mold and a lower mold, the upper mold is connected to an ultrasonic generator, and the vibration frequency generated by the ultrasonic generator is transmitted to the upper cover of the product through the upper mold; the lower mold includes a bottom plate, a fixed lower mold, a movable lower mold, a push block and a driver, the driver is fixed at one end of the bottom plate, the fixed lower mold is fixed at the other end of the bottom plate, the movable lower mold can be linearly movably connected to the bottom plate and is located between the driver and the fixed lower mold, the driver is provided with a push rod, and the push rod is connected to one side of the movable lower mold through the push block, the other side of the movable lower mold is provided with a first concave model cavity, and the side of the fixed lower mold opposite to the movable lower mold is provided with a second concave model cavity, the first concave model cavity and the second concave model cavity are matched to form a concave model cavity for placing the lower shell of the product, and the side wall of the concave model cavity is matched with the surrounding of the lower shell of the product without gap.

[0006] As a preferred solution of the utility model, the push rod is fixedly connected to the push block.

[0007] As a preferred solution of the utility model, the end of the push rod is provided with an externally threaded extension section, the push block is provided with a first through hole for the externally threaded extension section to pass through, the externally threaded extension section is threadedly connected to two locking nuts, and the push block is clamped between the two locking nuts.

[0008] As a preferred solution of the utility model, the push block is elastically connected to the movable lower mold.

[0009] As a preferred solution of the utility model, an elastic connecting component is provided between the push block and the movable lower mold, and the elastic connecting component includes a connecting bolt and a spring; the push block is provided with a second through hole for the connecting bolt to pass through, the axis of the second through hole is parallel to the moving direction of the movable lower mold, and the connecting bolt is slidably matched with the first through hole; the movable lower mold is provided with a threaded hole for the connecting bolt to be threadedly connected; the outer diameter of the bolt head of the connecting bolt is larger than the aperture of the second through hole; the spring is sleeved on the connecting bolt, and one end of the spring is abutted against the end face of the push block, and the other end of the spring is abutted against the end face of the movable lower mold.

[0010] As a preferred solution of the utility model, the elastic connection components are provided with two groups and are symmetrically arranged on the push block.

[0011] As a preferred solution of the utility model, the movable lower mold is connected to the bottom plate in a linearly movable manner via a dovetail slide rail.

[0012] As a preferred solution of the utility model, the driver is a push-pull type quick clamp.

[0013] As a preferred solution of the utility model, the driver is an electric push rod.

[0014] As a preferred solution of the utility model, the driver is a pneumatic cylinder or an oil cylinder.

[0015] Compared with the prior art, the thin-wall plastic ultrasonic welding mold of the utility model has the following beneficial effects:

[0016] The lower mold of the utility model is composed of a bottom plate, a fixed lower mold, a movable lower mold, a push block, a driver, etc. The driver can push the movable lower mold to move toward the side of the fixed lower mold through the push block, so that the first concave mold cavity of the movable lower mold cooperates with the second concave mold cavity of the fixed lower mold to form a concave mold cavity for placing the lower shell of the product, and the lower shell of the product is clamped by the concave mold cavity. The side wall of the concave mold cavity is in a tightly fitted state with the surrounding of the lower shell of the product, eliminating the gap between the lower shell of the product and the lower mold, and the thin walls around the lower shell of the product are fully supported and will not bend outwards due to force, thereby ensuring the stability of ultrasonic welding. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solution of the embodiment of the utility model, the drawings of the embodiment will be briefly introduced below.

[0018] Figure 1 It is a structural schematic diagram of an existing thin-wall plastic ultrasonic welding mold;

[0019] Figure 2 It is an exploded view of a thin-walled plastic ultrasonic welding mold provided by an embodiment of the utility model;

[0020] Figure 3 This is the main view after the lower mold is assembled.

[0021] Markings in the figure:

[0022] Upper mold 1; lower mold 2; bottom plate 21; fixed lower mold 22; second concave mold cavity 221; movable lower mold 23; first concave mold cavity 231; push block 24; driver 25; ejector rod 251; external thread extension section 252; locking nut 253; connecting bolt 26; spring 27; dovetail slide rail 28; product upper cover 31; product lower shell 32. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like used in the present invention to indicate the orientation or position relationship is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0025] like Figure 2 and Figure 3 Shown is a preferred embodiment of the utility model.

[0026] A thin-wall plastic ultrasonic welding mold is used for welding the upper cover 31 and the lower shell 32 of the product together, which includes an upper mold 1 and a lower mold 2, the upper mold 1 is connected to an ultrasonic generator (not shown in the figure), and the vibration frequency generated by the ultrasonic generator is transmitted to the upper cover 31 of the product through the upper mold 1; the lower mold 2 includes a bottom plate 21, a fixed lower mold 22, a movable lower mold 23, a push block 24 and a driver 25, the driver 25 is fixed to one end of the bottom plate 21, the fixed lower mold 22 is fixed to the other end of the bottom plate 21, and the movable lower mold 23 is connected to the bottom plate 2 in a linearly movable manner. 1, and is located between the driver 25 and the fixed lower die 22, the driver 25 is provided with a push rod 251, the push rod 251 is connected to one side of the movable lower die 23 through the push block 24, the other side of the movable lower die 23 is provided with a first concave model cavity 231, the side of the fixed lower die 22 opposite to the movable lower die 23 is provided with a second concave model cavity 221, the first concave model cavity 231 and the second concave model cavity 221 cooperate to form a concave model cavity for placing the product lower shell 32, and the side wall of the concave model cavity is matched with the surrounding of the product lower shell 32 without gap.

[0027] Therefore, according to the thin-walled plastic ultrasonic welding mold of the embodiment of the utility model, its lower mold 2 is composed of a bottom plate 21, a fixed lower mold 22, a movable lower mold 23, a push block 24, a driver 25, etc. The driver 25 can push the movable lower mold 23 to the side of the fixed lower mold 22 through the push block 24, so that the first concave mold cavity 231 of the movable lower mold 23 and the second concave mold cavity 221 of the fixed lower mold 22 are matched to form a concave mold cavity for placing the product lower shell 32, and the product lower shell 32 is clamped by the concave mold cavity. The side wall of the concave mold cavity is in a tight fit with the surrounding of the product lower shell 32, eliminating the gap between the product lower shell 32 and the lower mold 2, and the thin walls around the product lower shell 32 are fully supported and will not bend outward due to force, thereby ensuring the stability of ultrasonic welding.

[0028] Exemplarily, the push rod 251 is fixedly connected to the push block 24. In this embodiment, the end of the push rod 251 is provided with an external thread extension section 252, and the push block 24 is provided with a first through hole for the external thread extension section 252 to pass through. The external thread extension section 252 is threadedly connected to two locking nuts 253, and the push block 24 is clamped between the two locking nuts, which is convenient for assembly and disassembly.

[0029] Exemplarily, the push block 24 is elastically connected to the movable lower die 23. In this embodiment, an elastic connection component is provided between the push block 24 and the movable lower die 23, and the elastic connection component includes a connecting bolt 26 and a spring 27. The push block 24 is provided with a second through hole for the connecting bolt 26 to pass through, the axis of the second through hole is parallel to the moving direction of the movable lower die 23, and the connecting bolt 26 is slidably matched with the first through hole; the movable lower die 23 is provided with a threaded hole for the connecting bolt 26 to be threadedly connected; the outer diameter of the bolt 26 head of the connecting bolt 26 is larger than the aperture of the second through hole; the spring 27 is sleeved on the connecting bolt 26, and one end of the spring 27 is against the end face of the push block 24, and the other end of the spring 27 is against the end face of the movable lower die 23. Therefore, the spring 27 provides pressure between the push block 24 and the movable lower mold 23. When the product size changes slightly, the spring 27 is deformed appropriately, and the movable lower mold 23 moves forward or backward appropriately, so that the movable lower mold 23 and the lower shell 32 of the product always maintain a close fit, and can adaptively eliminate the gap between the lower shell 32 and the lower mold 2 caused by product tolerance fluctuations, further ensuring the stability of ultrasonic welding.

[0030] Furthermore, in order to ensure that the pressure provided by the spring 27 is uniform and reliable, the elastic connection components (ie, the connection bolts 26 and the springs 27 ) are provided in two groups and are symmetrically arranged on the push block 24 .

[0031] Exemplarily, in order to ensure that the movable lower mold 23 can stably move linearly on the bottom plate 21 , the movable lower mold 23 is linearly movably connected to the bottom plate 21 via a dovetail slide rail 28 .

[0032] Exemplarily, the driver 25 is preferably an existing push-pull type quick clamp, which is low in cost and easy to operate. Of course, in other optional embodiments, the driver 25 can also be an electric push rod, a cylinder or an oil cylinder.

[0033] In the description of the present invention, it should be understood that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" used in the present invention should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] The above disclosure is only a preferred embodiment of the present invention, and certainly cannot be used to limit the scope of rights of the present invention. Therefore, equivalent changes made according to the scope of the patent application of the present invention are still within the scope covered by the present invention.

Claims

1. A thin-wall plastic ultrasonic welding mold, characterized in that: The invention comprises an upper die and a lower die, wherein the upper die is connected to an ultrasonic generator, and the vibration frequency generated by the ultrasonic generator is transmitted to the upper cover of the product through the upper die; the lower die comprises a bottom plate, a fixed bottom die, a movable bottom die, a push block and a driver, wherein the driver is fixed at one end of the bottom plate, the fixed bottom die is fixed at the other end of the bottom plate, the movable bottom die is connected to the bottom plate in a linearly movable manner, and is located between the driver and the fixed bottom die, the driver is provided with a push rod, and the push rod is connected to one side of the movable bottom die through the push block, the other side of the movable bottom die is provided with a first concave mold cavity, the side of the fixed bottom die opposite to the movable bottom die is provided with a second concave mold cavity, the first concave mold cavity and the second concave mold cavity are matched to form a concave mold cavity for placing the lower shell of the product, and the side wall of the concave mold cavity is matched with the surrounding of the lower shell of the product without gap.

2. The thin-wall plastic ultrasonic welding mold according to claim 1, characterized in that: The push rod is fixedly connected to the push block.

3. The thin-wall plastic ultrasonic welding mold according to claim 2, characterized in that: An external thread extension section is provided at the end of the push rod, and the push block is provided with a first through hole for the external thread extension section to pass through. The external thread extension section is threadedly connected to two locking nuts, and the push block is clamped between the two locking nuts.

4. The thin-wall plastic ultrasonic welding mold according to claim 3, characterized in that: The push block is elastically connected to the movable lower mold.

5. The thin-wall plastic ultrasonic welding mold according to claim 4, characterized in that: An elastic connecting component is provided between the push block and the movable lower mold, and the elastic connecting component includes a connecting bolt and a spring. The push block is provided with a second through hole for the connecting bolt to pass through, and the axis of the second through hole is parallel to the moving direction of the movable lower mold, and the connecting bolt is slidably matched with the first through hole; the movable lower mold is provided with a threaded hole for the connecting bolt to be threadedly connected; the outer diameter of the bolt head of the connecting bolt is larger than the aperture of the second through hole; the spring is sleeved on the connecting bolt, and one end of the spring is abutted against the end face of the push block, and the other end of the spring is abutted against the end face of the movable lower mold.

6. The thin-wall plastic ultrasonic welding mold according to claim 5, characterized in that: The elastic connection components are provided in two groups and are symmetrically arranged on the push block.

7. The thin-wall plastic ultrasonic welding mold according to claim 1, characterized in that: The movable lower die is connected to the bottom plate in a linearly movable manner via a dovetail slide rail.

8. The thin-wall plastic ultrasonic welding mold according to claim 1, characterized in that: The driver is a push-pull type quick clamp.

9. The thin-wall plastic ultrasonic welding mold according to claim 1, characterized in that: The driver is an electric push rod.

10. The thin-wall plastic ultrasonic welding mold according to claim 1, characterized in that: The driver is a pneumatic cylinder or an oil cylinder.

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