CN102699178A - Top cropping mould for car decorative part with strip-shaped abnormal section - Google Patents

Abstract

The invention discloses a top cropping mould for a car decorative part with a strip-shaped abnormal section, which is used for solving problems that the existing top cropping mould is low in production efficiency, high in processing cost and long in production period. The top cropping mould comprises two top croppingmould units and a middle material supporting block, wherein the two top cropping mould units are identical in structure and are arranged on the left side and the right side, and the arranging angle of the two top cropping mould units is matched with arcs of the two ends of a work piece; and the arranging position of the two top cropping mould units is matched with the length dimension of the work piece. The top cropping mould has the characteristics of reliable performance, rational structure, and convenience in operation, so that not only the production efficiency and product quality are greatly improved, but also the manufacturing cost for the mould and products is reduced.

Description

A cutting die for narrow strips and special-shaped cross-section automotive trim parts

technical field

The invention relates to a blanking die, in particular to a die suitable for cutting the head of a narrow strip-shaped special-shaped cross-section automobile trim, and belongs to the technical field of metal stamping.

Background technique

Among the automotive accessories, there is a type of long strip parts with a "C" cross section (shown in Figure 1 and Figure 2), such as rain eaves and decorative strips. The production process of this kind of parts is first rolling and shaping, and then the length and shape of the parts are determined by cutting the head of the die.

At present, the head cutting process of such parts usually adopts a fixed cutter. When feeding, the workpiece needs to be inserted into the lower die according to the arc shape of the product. Since the cross section of the product is generally very narrow, it takes time and effort to thread the material; in addition, this processing method can only When punching one end of a part, the other end needs to be punched in the next process to determine the length of the part. In order to ensure the accuracy of the product length, an accurate positioning mechanism must be set, which adds difficulty to debugging and production. Not only the work efficiency is low, the production cycle is long, but also the manufacturing cost of molds and products is increased.

Contents of the invention

The object of the present invention is to aim at the drawbacks of the prior art, to provide a method with reliable performance, convenient operation, which can determine the length of the part by punching two ends at the same time, reduce the difficulty of debugging and production, and improve production efficiency. A cutting die for trimming automotive trim parts with narrow strips and special-shaped cross-sections to reduce production costs.

Problem described in the present invention is realized with following technical scheme:

A trimming die for a narrow strip-shaped special-shaped cross-section automobile trim, which includes two trimming die units with the same structure and arranged left and right and a middle support block. Shape matching, the placement of the two cutting die units matches the length and size of the workpiece.

The above-mentioned narrow-strip special-shaped cross-section automotive trim cutting die, the cutting die unit is composed of an upper die part and a lower die part, and the upper die part includes an upper template, an upper backing plate, an upper knife seat, an upper knife and an elastic The pressing mechanism, the upper knife seat and the upper backing plate are sequentially fixed on the upper template by the threaded connection mechanism, the upper knife is fixed on the upper knife seat, and the elastic pressing mechanism includes a pressing plate, a discharge screw and a spring I , the clamping plate is connected with the upper tool seat through the discharge screw, the spring I passes through the upper backing plate and the upper tool seat, the upper end is connected with the upper template, and the lower end is connected with the pressing plate.

The above-mentioned narrow-strip special-shaped cross-section automotive trim cutting die, the lower die part of the cutting die unit includes a lower template, a lower backing plate, a lower knife seat, a lower knife, a spring II and a floating material pin, and the lower knife seat , The lower backing plate is sequentially fixed on the lower template by screw connection. The lower knife includes a fixed lower knife and a movable lower knife. The fixed lower knife is composed of a fixed lower knife I, a fixed lower knife II, and a fixed lower knife III. The movable lower knife is composed of movable lower knife I and movable lower knife II, among which three fixed lower knives are fixed on the lower knife seat, and two movable lower knives are respectively inserted between the three fixed lower knives. The spring II and the floating The material pins are arranged in a symmetrical structure. The lower end of the spring II is installed on the lower template, and the upper end is connected with the floating material pin. The lower end of the floating material pin is a stepped structure, and the floating material pin is located between the spring II and the movable lower knife.

In the above-mentioned narrow-strip special-shaped cross-section cutting head mold for automotive trim parts, the contact surfaces of the movable lower knife I, the movable lower knife II and the fixed lower knife I are inclined surfaces, wherein the inclined surface on the left side of the fixed lower knife I and the right side of the fixed lower knife I The angle between the slopes is α=8~10°. Dovetail guide grooves are provided on the slopes on both sides of the fixed lower knife I, and guide sliders are set on the slopes of the movable lower knife I and the movable lower knife II. The dovetail guide groove of the lower knife I is assembled with the guide sliders of the movable lower knife I and the movable lower knife II.

In the head-cutting mold for automotive decorative parts with narrow strips and special-shaped cross-sections, the spring I of the upper mold part is a spring with a medium load, and the spring II of the lower mold part is a spring with a light and small load.

In the head-cutting mold for the narrow strip-shaped special-shaped cross-section automotive trim, the working surface of the intermediate support block matches the cross-sectional shape of the workpiece.

The invention realizes the purpose of punching two ends at the same time through the two cutting die units arranged on the left and right, and eliminates the positioning mechanism necessary for the two punching, which not only ensures the processing accuracy of the workpiece, but also simplifies the discharging operation ; In the structure of the present invention, the movable lower knife I, the movable lower knife II and the fixed lower knife I are all provided with inclined surfaces of the same angle, and the angles of the inclined surfaces on both sides of the fixed lower knife I are inwardly inclined, and the included angle is between 8-10° The fixed lower knife Ⅰ, the movable lower knife Ⅰ, and the movable lower knife Ⅱ are also provided with dovetail guide mechanisms that cooperate with each other and slide, so that the movable lower knife can move upward and inward under the elastic force of the spring Ⅱ, so that the two movable The lateral distance of the outer edge of the lower knife gradually decreases with the movement of the knife until it is less than the inner width of the sectional shape of the product, so that the purpose of direct discharging from top to bottom can be realized; in the structure of the present invention, the upper mold part Spring Ⅰ is a medium-load spring, and spring Ⅱ of the lower die is a spring with light and small load. Therefore, the force of the spring of the elastic pressing mechanism is much greater than the force of the spring supporting the movable lower knife, so that the upper die will be moved first when it goes down. The lower knife is pressed down. After the movable lower knife is combined with the fixed lower knife and is in a state consistent with the cross-sectional shape of the product, the upper and lower knives cooperate to complete the punching action of the end of the workpiece. In a word, the present invention has the characteristics of reliable performance, reasonable structure and convenient operation, which can not only significantly improve production efficiency and product quality, but also reduce the manufacturing cost of molds and products.

Description of drawings

The present invention will be further described below in conjunction with accompanying drawing.

Fig. 1, Fig. 2 are workpiece cross-sectional views applicable to the present invention;

Fig. 3 is a structural diagram of the present invention;

Fig. 4 is a structural schematic diagram of a cutting die unit;

Fig. 5 is a schematic diagram of the position of the upper and lower cutters in the closed state of the mold;

Fig. 6 is a schematic diagram of the structure of the fixed lower knife I;

Fig. 7 is a schematic diagram of the structure of movable lower knife I and movable lower knife II;

Fig. 8 is a schematic diagram of the mold opening state;

Fig. 9 is a schematic diagram of the downward movement state of the mold upper mold;

Fig. 10 is a schematic diagram of the closed state of the mold.

Each label in the figure is: 1, head cutting die unit, 1-1, upper template, 1-2, upper backing plate, 1-3, upper knife seat, 1-4, upper knife, 1-5, pressure plate , 1-6, unloading screw, 1-7, spring Ⅰ, 1-8, lower knife seat, 1-9, lower backing plate, 1-10, lower template, 1-11, spring Ⅱ, 1-12, Floating material pin, 1-13, fixed lower knife Ⅰ, 1-14, fixed lower knife Ⅱ, 1-15, fixed lower knife Ⅲ, 1-16, movable lower knife Ⅰ, 1-17, movable lower knife Ⅱ, 2 , the middle support block, 3, the workpiece;

a. The left inclined surface of the fixed lower knife I, b. The right inclined surface of the fixed lower knife I, a', the inclined surface of the movable lower knife I, b', the inclined surface of the movable lower knife II.

Detailed ways

Referring to Fig. 3, the present invention comprises two head-cutting die units 1 and an intermediate support block 2 with the same structure arranged left and right, the placement angles of the two head-cutting die units 1 match the arcs at both ends of the workpiece 3, and the two The placement position of the cutting die unit 1 matches the length dimension of the workpiece 3 .

Referring to Fig. 3 and Fig. 4, the head cutting die unit 1 of the present invention is composed of an upper die part and a lower die part, and the upper die part includes an upper template 1-1, an upper backing plate 1-2, and an upper knife seat 1-3 , the upper knife 1-4 and the elastic pressing mechanism, the upper knife seat 1-3 and the upper backing plate 1-2 are fixed on the upper template 1-1 in turn by screw connection, and the upper knife 1-4 is fixed on the upper knife seat 1-3, the elastic pressing mechanism includes a pressing plate 1-5, a discharge screw 1-6 and a spring I1-7, and the pressing plate 1-5 connects with the upper knife seat through the discharging screw 1-6 1-3 are connected, the spring I1-7 passes through the upper backing plate 1-2 and the upper knife seat 1-3, the upper end is connected with the upper template 1-1, and the lower end is connected with the pressure plate 1-5.

Referring to Fig. 3 and Fig. 4, the lower mold part of the head cutting die unit of the present invention includes a lower template 1-10, a lower backing plate 1-9, a lower knife seat 1-8, a lower knife, a spring II 1-11 and a floating material pin 1 -12, the lower knife seat 1-8 and the lower backing plate 1-9 are sequentially fixed on the lower template 1-10 by screw connection, the lower knife includes a fixed lower knife and a movable lower knife, and the fixed lower knife is composed of Fixed lower knife I1-13, fixed lower knife II1-14, fixed lower knife III1-15, the movable lower knife is composed of movable lower knife I1-16 and movable lower knife II1-17, three of which are fixed On the lower knife seat 1-8, two movable lower knives are inserted between three fixed lower knives, the spring II1-11 and the floating material pin 1-12 are symmetrically arranged, and the lower end of the spring II1-11 is installed on the lower On the template 1-10, the upper end is connected with the floating material pin 1-12, the lower end of the floating material pin 1-12 is a stepped structure, and the floating material pin 1-12 is located between the spring II 1-11 and the movable lower knife.

Referring to Fig. 4, Fig. 6, Fig. 7, the contact surfaces of the movable lower knife I1-16, the movable lower knife II1-17 and the fixed lower knife I1-13 of the present invention are inclined planes, wherein the left slope a of the fixed lower knife I and the fixed The included angle between the slope b on the right side of the lower knife I is α=8~10°. There are dovetail guide grooves on the slopes on both sides of the fixed lower knife I1-13. A guide slider is set on the slope b' of II, and the dovetail guide groove of the fixed lower knife I1-13 is fitted with the guide sliders of the movable lower knife I1-16 and the movable lower knife II1-17.

Referring to Fig. 4, the springs I1-7 of the upper die part of the present invention are medium-load springs, and the springs II1-11 of the lower die part are light and small-load springs.

Referring to FIG. 3 , the working surface of the intermediate support block 2 of the present invention matches the cross-sectional shape of the workpiece 3 .

With reference to Fig. 8, Fig. 9, Fig. 10, and in conjunction with specific embodiment the course of work of the present invention is described:

Fig. 8 is a schematic diagram of the mold opening state of the cutting die unit 1 of a narrow "C"-shaped cross-section cutting die for automobile trim parts. Distance H1=240mm, movable lower knife Ⅰ 1-16, movable lower knife Ⅱ 1-17 are lifted by spring Ⅱ 1-11 to a height of 7mm, and the lateral distance between the two sides of movable lower knife 1-16, 1-17 is less than that of workpiece 3 Section inner void width. Put the workpiece to be processed on the lower knife of the mold from top to bottom, the middle part of the workpiece 3 is supported by the middle support block 2, pay attention to the visual inspection that both ends of the workpiece 3 protrude from the edge of the lower knife of the mold.

Figure 9 shows the structural state when the upper slide block of the machine tool drives the upper template 1-1 down to the pressure plate 1-5 when it contacts the workpiece. Under the action of the thrust, the pressing plate 1-5 moves upward relative to the upper knife seat 1-3, but the upward speed of the pressing plate 1-5 is much lower than the downward speed of the movable lower knife, until the movable lower knife goes down to the end, and Combined with the fixed lower knife 1-13, after the shape of the top surface is consistent with the cross-sectional shape of the workpiece, the distance between the upper template 1-1 and the lower template 1-10 is H2=215mm, and the upper knife 1-4 has not yet touched the workpiece 3 , In the present embodiment, the movable lower knife moves downward by 7mm, and the pressing plate moves upward by 3mm.

Then the upper mold continues to move downward, the state of the lower knife remains unchanged, the pressure plate 1-5 moves upward, the upper knife 1-4 protrudes from the lower edge of the pressure plate 1-5, and the workpiece 3 starts to be punched until the machine tool reaches the workpiece end at the bottom dead point The head is cut off, and the state is shown in Figure 10 at this time, the distance H3=207mm between the upper template 1-1 and the lower template 1-10. Finally, the upper slider of the machine tool returns, the upper mold moves upward, the pressing plate 1-5 leaves the part, the spring II 1-11 lifts the movable lower knife, and the lateral distance between the two sides of the movable lower knife is smaller than the cross-sectional inner width of the workpiece 3 , after the machine tool stops running, take out the product parts from the bottom up to complete the head cutting process.

Claims (6)

1. A cutting head die for narrow strip-shaped special-shaped cross-section automobile trim, characterized in that it includes two head cutting die units (1) and a middle support block (2) with the same structure and arranged left and right, the two The placement angle of the cutting die unit (1) matches the arc at both ends of the workpiece (3), and the placement positions of the two cutting die units (1) match the length and dimension of the workpiece (3). 2. The narrow-strip special-shaped cross-section trimming die for automobile trim parts according to claim 1, characterized in that, the trimming die unit (1) is composed of an upper die part and a lower die part, and the upper die part includes The upper template (1-1), the upper backing plate (1-2), the upper knife seat (1-3), the upper knife (1-4) and the elastic pressing mechanism, the upper knife seat (1-3), The upper backing plate (1-2) is sequentially fixed on the upper template (1-1) by a threaded connection mechanism, the upper knife (1-4) is fixed on the upper knife seat (1-3), and the elastic pressing mechanism includes Pressing plate (1-5), unloading screw (1-6) and spring I (1-7), the pressing plate (1-5) connects with the upper knife seat ( 1-3), the spring I (1-7) passes through the upper backing plate (1-2) and the upper knife seat (1-3), its upper end is connected with the upper template (1-1), and its lower end is connected with the pressing plate (1-3). Sheets 1-5 are connected. 3. The narrow-strip special-shaped cross-section trimming mold for automotive trims according to claim 2, characterized in that, the lower mold part of the trimming mold unit includes a lower template (1-10), a lower backing plate (1- 9), the lower knife seat (1-8), the lower knife, spring II (1-11) and the floating material pin (1-12), the lower knife seat (1-8), the lower backing plate (1-9 ) are sequentially fixed on the lower template (1-10) by a threaded connection mechanism, the lower knife includes a fixed lower knife and a movable lower knife, and the fixed lower knife consists of fixed lower knife I (1-13), fixed lower knife II (1-14), fixed lower knife III (1-15), the movable lower knife is composed of movable lower knife I (1-16) and movable lower knife II (1-17), three of which are fixed lower knife Fixed on the lower knife seat (1-8), the two movable lower knives are inserted between the three fixed lower knives, the spring II (1-11) and the floating material pin (1-12) are symmetrically arranged , the lower end of the spring II (1-11) is installed on the lower template (1-10), and the upper end is connected with the floating material pin (1-12). The lower end of the floating material pin (1-12) is a ladder structure, and the floating material pin (1-12) is located between spring II (1-11) and the movable lower knife. 4. The mold for cutting the head of a narrow strip-shaped special-shaped cross-section automobile trim according to claim 3, wherein the movable lower knife I (1-16), the movable lower knife II (1-17) and the fixed lower knife The contact surface of Ⅰ (1-13) is a bevel, and the angle between the left bevel (a) of the fixed lower knife I and the right bevel (b) of the fixed lower knife I is α=8~10°. (1-13) There are dovetail guide grooves on the slopes on both sides, and guide sliders are set on the slope (a') of the movable lower knife I and the slope (b') of the movable lower knife II, and the fixed lower knife The dovetail guide groove of I (1-13) is assembled with the guide slide block of movable lower knife I (1-16) and movable lower knife II (1-17). 5. The narrow-strip special-shaped cross-section automotive trim cutting die according to claim 4, characterized in that, the spring I (1-7) of the upper die part is a medium-load spring, and the spring of the lower die part Ⅱ (1-11) is a light and small load spring. 6 . The narrow-strip special-shaped cross-section trimming die for automotive trims according to claim 5 , characterized in that, the working profile of the intermediate support block ( 2 ) matches the cross-sectional shape of the workpiece ( 3 ).

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