KR20220080268A - Die or mould made of metal plate - Google Patents

Abstract

In manufacturing a high-priced mold, without using a whole metal as the base material of the mold, a metal plate of a low-cost material is cut and laminated in two or more layers, and then used by welding. Metal plate material The final surface of the mold is formed by processing after growth welding with the necessary metal on the upper part of the base material. It is a patent that reduces the material cost and processing cost of the mold.

Description

Die or mold made of metal plate

The present invention relates to a method for manufacturing a mold and a mold, and more specifically, to obtain a cost reduction effect by changing the base base material from an existing whole metal to a laminated combination of metal plates.

Most of the molds used for mass production are made of metal, and the overall size should be 1.5 to 2 times larger than the product. Because it is used, it is a more expensive material than general metal and requires a lot of processing time, so the manufacturing price is high. Various manufacturing methods have been proposed to reduce the cost of such high-priced molds.

In order to reduce the manufacturing cost of expensive molds, various methods are used, such as the use of low-cost metal materials, local strengthening of the mold surface, recycling of existing molds, and standardization and recycling of mold bases.

The present invention relates to a manufacturing method for reducing manufacturing cost by reducing material cost and processing cost of a mold.

In order to reduce the manufacturing cost of the mold, as a method to reduce material and processing costs, low-cost metal plates with low metal properties are used as the main material, laminated, and welded together to use as a basic base material before shape processing. In addition, the necessary surface is locally formed by padding on the surface of the mold, which is subjected to a lot of load, by padding with the material required for the existing mold steel.

As the manufacturing cost of the mold is reduced, the effect of reducing the initial cost of product development can be obtained. It is possible to shorten the development period as the manufacturing time of the mold is reduced. In the case of a mold that requires a low load/short life, the applicability is higher, and the depreciation cost of the mold is reduced, thereby reducing product cost.

1 is a cross-sectional view of an upper/lower mold using a general whole metal base material when manufacturing a cup-shaped product;
Figure 2 is a cross-sectional view of a part removed by cutting and a base metal base material when manufacturing the core mold part of Figure 1;
3 is a cross-sectional view of cutting/cutting a metal plate and stacking it for use as a base material of a mold;
Figure 4 is an enlarged cross-section of the final difference after growth welding and machining the base base material of the core mold part of Figure 3;
Figure 5 is a cross-sectional view of the upper / lower mold finally processed using the metal plate base base material of the present invention

Die & mold is a tool that manufactures products by processing and molding materials using properties such as plasticity, malleability, and fluidity of the target material. It refers to a mold made using metal materials. It is a generic name for “a frame that serves as a matrix for mass production of products of the same shape and standard.”

Molds can be classified in various ways according to the material, construction method, and product properties of the product to be processed. Melting Point Metal, Forging Die-Metal Non-Metal, Rubber Mould-Rubber, Glass Mould-Glass, Powder Metallurgy Mould-Metal and Non-Metal, Ceramic Mould etc.

The required characteristics of metals processed into molds (mainly tool steel and special steel) vary depending on the area of use, application, processing method, degree or production method, but ① wear resistance, ② crack resistance, ③ mirror finish, ④ wrinkle workability, ⑤ heat resistance, ⑥ Fracture resistance, ⑦ Thermal stress and fatigue resistance, ⑧ High toughness and ductility, ⑨ Machinability, ⑩ Corrosion resistance, ⑪ Weldability, etc. are required. These required characteristics reflect the steelmaking, smelting, and alloying of general metals or metallic materials, so the material cost increases. to be.

If the mold is classified according to the length of the required life, it is divided into 5 classes according to the number of injections during use. The first class is more than 1 million times, the second class 500,000 to 1 million times, the third class 300,000 to 500,000 times, the fourth class is 100,000 and 300,000 times, and the fifth class is less than 100,000 times. According to this classification, the type of processing material, mold size, precision, etc. are different, so the mold cost varies. As consumer demands for products are increasingly diversified, the era has come to produce a variety of products in small batches rather than mass production of products of one specification. Accordingly, rather than a single mold with a long life, multiple molds with a shorter life span are needed. Manufacturing a large number of molds even with a short life span greatly increases the burden of the manufacturer's development cost in terms of cost.

The present invention relates to a method for lowering the manufacturing cost of the above mold.

1 is a configuration diagram when a mold is configured in a conventional manner by setting the cup-shaped product 10 virtually. In general, the concave part of the mold is called the cavity mold part 20 , and the convex part is collectively called the core mold part 30 . When the shape of the product is complicated, the core 30 and the cavity 20 are manufactured in several pieces and assembled for use. However, in the case of a simple shape such as the case, two pieces are produced as a top/bottom type.

The existing manufacturing and processing method is the case of the core (30) in FIG. 2, for example, in order to produce a desired shape as one body, the remaining part of the core mold part (32) and the removal part of the core mold part (33) are combined. Starting from the whole metal base material (31=32+33), the removal part 33 of the core mold part should be removed by cutting machining, electric discharge machining, or the like. The larger the volume of the core mold part removal part 33 is, the larger the initial size of the base metal base material 31, which is a normal hexahedron, increases, and the processing cost for the removal is consumed a lot, which causes an increase in the cost of the mold.

According to the modified method of the present invention, as shown in FIG. 3 , several sheets of metal plate 34 of the core mold part are cut to be smaller than the final size of the core, and laminated welding is performed to use them as base materials 21 and 34 of the mold. At this time, the material cost can be minimized by using a low-cost general material that satisfies only about the compressive strength of the metal plate used at this time and other mechanical properties are not important. Each metal plate of the base material is cut and prepared in advance in consideration of the necessary parts such as the mold shape interface/cooling channel/ejection fin (mil fin), and can be cut in different thicknesses and shapes. Metal plate materials manufactured by rolling, etc. can be cut vertically/obliquely by laser cutting, plasma cutting, etc. The base material is completed by joining the laminated metal plates by overlapping/edge welding. During this process, it is possible to form a three-dimensional cooling channel, which is very important to improve the cooling performance of the mold, and performance/productivity improvement is additionally possible.

In order to process a precise mold surface on the finished metal plate base base material, as shown in FIG. 4, padding is performed on the outer part of the base base material slightly higher than the final core size (35). In the core mold part grown slightly higher than the required dimension, from the shape 35 before machining after welding growth to the shape 36 after machining the core mold part, the machining can be minimized by removing a small thickness part by precision machining or electric discharge machining. . At this time, the final remaining mold surface portion 36 requires the inherent mechanical, thermal, and chemical properties of the mold, so a metal suitable for this is used as a filler material for growth welding.

In this way, the base base material is used by welding the low-cost cut metal plate 34, and the high-priced metal for the mold is used only on the surface parts 35 and 36 of the mold in the form of filler metal when welding, and the portion grown by welding Since unnecessary parts 35 are removed with minimal machining and electric discharge machining, it is possible to minimize material cost and processing cost unit cost in the entire process of mold manufacturing.

The above description is an example of manufacturing the core mold 30 using the metal plate 34 as a base material. The same method may be applied to the cavity mold 20 to manufacture an upper/lower mold as shown in FIG. 5 .

Also, the above description is generally an example for a mold with a core and a cavity. The scope of application of the present invention can replace the existing mold with a low lifespan and a long life depending on the welding strength of the metal plate base base material compared to the continuum strength of the whole metal base base material, which is the existing method. The plastic injection mold requires relatively small rigidity of the base material, so it has high applicability.

10: Cup-shaped product shape cross section
20: cavity mold part
21: Cavity mold part metal plate base base material
22: cavity mold part welding and growth welding part
30: core mold part
31: core mold whole metal base base material
32: core mold part after processing the whole metal base material
33: The part to be removed by processing from the base base material of the whole metal
34: core mold part metal plate base base material
35: Shape before machining after welding of the core mold part (the part to be removed by machining)
36: The final shape after machining the core mold part (cutting and polishing, etc.)

Claims (4)

A plastic injection mold using a manufacturing method that does not use whole metal as a base material for expensive mold processing, but laminates two or more low-cost metal plates and joins them together by welding. Die casting mold using a manufacturing method that does not use whole metal as a base material for expensive mold processing, but uses a manufacturing method of stacking two or more low-cost metal plates and joining them together by welding. A mold for deep drawing press using a manufacturing method that does not use whole metal as a basic base material for expensive mold processing, but uses a manufacturing method in which two or more layers of inexpensive metal plates are laminated and joined by welding to use as a base material. A mold using a manufacturing method in which an expensive metal for a mold is locally grown and welded to the necessary part of the base material that is laminated and welded with a low-cost metal plate, then processed and used as the mold surface

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