Abstract
A precision multifunctional progressive stamping die, comprising a lower die, an upper die, and inner and outer guide mechanisms. The upper die includes an upper die seat, a convex die pad, a convex die fixing plate, a discharge pad, and a discharge plate. The lower die includes a lower die seat, a concave die pad, and a concave template; The outer guiding mechanism includes a large guide column, a large ball sleeve, a large guide sleeve, and a spring, while the inner guiding mechanism includes a small guide column, a small ball sleeve, a small guide sleeve, and a spring; Its processing feature is to fasten the discharge plate and concave template together for processing.
Description
This utility model belongs to a universal stamping die frame mold structure, which is suitable for skip step molds, continuous molds, and single process simple molds for punching, bending, stretching, and forming processing of small and medium-sized parts.
A set of stamping dies can be divided into two parts: the mold frame and the formed parts. The difference between different molds mainly lies in the formed parts, including convex molds, concave molds, fixing plates, and spring pressing plates (or discharge plates). This part of the steel consumption accounts for only about 25% of the total steel consumption of the mold, while the mold frame part accounts for 75%. The mold frame is roughly the same for various different molds. Therefore, in recent years, universal mold frames have been promoted and used, which has played a significant role in shortening the mold manufacturing cycle and reducing mold production time. However, there has not been a substantial improvement in the overall structure, so the universal part is not enough.
The QD-308 rapid replacement universal mold frame in Japan is currently a widely used mold frame structure. It is composed of a standard high-precision ball guide column guide sleeve mold frame and upper and lower mold seats with movable positioning mechanism, clamping mechanism, and guide mechanism. Its characteristics are simple and fast loading and unloading of molds, short auxiliary time, and eliminating the need for guide column guide sleeves and upper and lower mold seats in mold manufacturing. The mold core is divided into two parts: the upper mold and the lower mold. The pressure plate is integrated with the upper mold, and the upper and lower molds are respectively mounted on the upper and lower mold frames. When assembling, a fitter is used to assemble the mold frame to ensure the assembly accuracy of the mold. Therefore, this type of mold has not been improved in the spring pressing plate part, and the alignment accuracy of the upper and lower molds is not high.
The universal mold frame structure of this utility model mainly improves the existing universal mold frame in two aspects.
The guide plate is divided into two parts: the guide plate frame and the guide plate. The guide plate is installed inside the guide plate frame. For different molds, guide plates with various types of holes will be designed and manufactured. The guide plate frame is mounted on the guide column of the mold frame through a guide sleeve to become a part of the mold frame. The guide plate is connected to the upper mold frame through an elastic top device.
The relative position between the pressure plate and the concave mold is ensured by a small guide column guide sleeve to ensure their mutual positional accuracy, thereby ensuring the precision of the upper and lower molds.
The mold structure of this utility model generally adopts a high precision stamping and pressure guide plate structure. The concave mold, pressure plate (including the guide plate guide part), fixed plate, and convex mold in the ordinary die are taken out to form the mold core assembly, and the rest form the universal mold frame.
The universal mold frame adopts a three-layer template positioning device structure consisting of fixed plates, guide plates, and concave molds. The middle pressure plate adopts a side push in frame positioning and fastening method. One side of the guide plate frame can be opened into an open frame, and the inner side is a sliding rail that matches the guide plate. During loading and unloading, the guide plate can be removed and pushed in from the open position, thus solving the problem of side loading and unloading of the entire mold core. The three-layer template positioning assembly structure improves the overall rigidity and accuracy of the entire mold, and also increases the service life of the universal mold frame.
For different stamping dies, the height of the convex die varies. Therefore, by designing the position of the punch pad to be adjustable and adjusting it through the pad block, the height of the punch can be designed more reasonably and economically.
The specific scheme of the utility model is shown in the attached drawings. Figure 1 is the main view, Figure 2 is the top view, and Figure 3 is the structural diagram of the guide plate frame.
The dotted line in the middle of Figure 1 represents the formed part of the mold, including the upper mold fixing plate [28], guide plate [27], concave mold and concave mold pad [29], as well as the small guide column [26] that ensures relative positional accuracy. During installation and operation, the corresponding small guide column holes or guide sleeve holes on the small guide column and guide plate are used to ensure the positional accuracy between the convex and concave molds.
Item [1] is the base, which is press fitted with guide post [19]. There are clamping devices such as part [2], part [3], and part [4] installed on part [1] to fix the concave mold. The clamping device can be in different forms such as hydraulic or wedge block. The guide column [19] forms a universal mold frame with the upper bracket [10] and pressure plate frame through ball guide sleeves [21], [20], and guide sleeve [18], respectively. The pressure plate frame is connected to the upper bracket [10] through elastic pressure components, including components [6], [7], and [11]. The distance between the ball guide sleeve and the base is maintained in a free state between the upper mold and the concave mold of the guide plate by a spring [22]. The upper bracket is equipped with a punch handle [15] and a cushion plate [13]. The distance between the cushion plate [13] and the upper bracket can be adjusted through a cushion block [14] to meet the needs of different punch lengths. The cushion plate is fixed to the upper bracket through sliding rails [12], fastening screws [8], fixing blocks [9], screws [17], and pins [16]. The sliding rail [12] forms a "T" - shaped sliding rail between the pad [13], which is used to install the upper mold fixing plate [28]. The fastening method is to rotate the fastening screw [8] and use the tapered surface at the end and the tapered hole on the matching part [12] to move the slide rail [12] up and down, thereby achieving the function of fastening the fixed plate.
Figure 3 shows the guide plate frame, which is a flat frame composed of components [5], [23], and fasteners [24] and [25]. To improve the stability and positioning accuracy of the framework, a multi-faceted fitting structure is adopted between component [23] and component [5], as shown in the figure, which can be a trapezoidal tooth meshing, a triangular or circular arc tooth meshing, a "T" - shaped, "V" - shaped, or "dovetail" - shaped fitting. It can be double-sided detachable as shown in the figure, or it can be three sided fixed and one side detachable. The purpose of being detachable on one side is to be able to install the guide plate from the side. The inner side of the frame is a sliding rail that matches with the guide plate. The fixed frame has three sides A, B, and C for guiding and positioning, with A and C surfaces forming a two-stage sliding fit with the guide plate. There are two protrusions on the B side, which prevent the side of the pressure plate from not being perpendicular to each other.
Mold loading and unloading: When unloading the mold, loosen screws [25] and [24], remove part [23], and loosen parts [12] and [3]. Remove the mold core components [22], [27], [29], and [26] from the upper mold fixing plate guide rail, the guide plate frame guide rail, and the base, respectively. When installing the mold, assemble the mold core parts and maintain their position with small guide columns. Push them into the mold frame from the side. First, insert the middle guide plate into the frame, position it, and then install part [23]. After tightening, use part [25] to fasten the guide plate, and then fix the convex mold fixing plate and concave mold separately. Therefore, the loading and unloading of the mold is very convenient.
The guide plate frame can also be connected to the guide column with a regular guide sleeve, but the accuracy is slightly lower than that of the ball guide sleeve. It can also be connected to the upper bracket only through parts [6], [11], and [7] without a guide sleeve. In this case, the accuracy is even worse and can only be used as a discharge plate.
The universal mold frame structure of this utility model has strong universality, good rigidity and accuracy, and can be used for precision progressive molds. Moreover, it greatly reduces the workload of designing and manufacturing stamping dies, and greatly reduces the consumption of mold steel.
Due to the use of "T" - shaped guide rails and slide rails to guide and position the mold core plate on the upper mold frame, a certain degree of accuracy can be achieved by machining with a general wire cutting machine. As the secondary guide column holes and guide sleeve holes are machined at the same time as the cutting holes, the operation of "tool alignment" by the fitter can be eliminated during the manufacturing process. The processed molds have high precision and good repeatability in terms of installation accuracy.
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