WO2016119540A1

WO2016119540A1 - Device for pressing channel section having bending angle less than or equal to 90 degrees

Info

Publication number: WO2016119540A1
Application number: PCT/CN2015/098073
Authority: WO
Inventors: 蔡旭婧; 颜昌海; 王祥; 王海峰; 贾鹏; 曹鹏伟; 蔡卫东
Original assignee: 南通昌荣机电有限公司
Priority date: 2015-01-30
Filing date: 2015-12-21
Publication date: 2016-08-04
Also published as: CN104550484B; CN104550484A

Abstract

A device for pressing a channel section having a bending angle less than or equal to 90 degrees comprises an upper die assembly (2) and a lower die assembly (3) disposed coaxially. The upper die assembly (2) comprises an expansion sleeve (called as a sleeve body thereinafter) and an expansion core (24) (called as a core body thereinafter) that are in sleeve connection and in clearance fit. The sleeve body is of a multi-pedaled structure (21, 22) in elastic connection, and the outside of the sleeve body is narrower in top and wider in bottom. At least one of a center hole of the sleeve body and the core body is shaped in a big-end-up wedge, the lowest point of the core body in an initial state is higher than the lowest point of the sleeve body, and a relatively-locking mechanism is mounted between the core body and the sleeve body. The lower die assembly (3) comprises an inner female die and an outer female die. The inner female die comprises a multi-pedaled structure (311, 312) in elastic connection, and a groove of the inner female die is a wedged groove and fits the sleeve body. The outer female body is located outside the inner female die. A groove of the outer female die is wider in top and narrower in bottom. An elastomer (323) is disposed in the groove of the outer female die and under the inner female die. When the device presses a channel section having a bending angle less than or equal to 90 degrees, the machining process is simple, and produced workpieces are standard and less prone to deformation and do not need to be corrected.

Description

Device for pressing a groove profile having a bending angle of 90° or less

Technical field

The present invention relates to a stamping apparatus, and more particularly to an apparatus for pressing a groove profile having a bending angle of 90 or less.

Background technique

At present, household appliances, instruments, automobiles and other industries have entered mass production. Many parts rely on mechanical processing for time and effort, and the accuracy is difficult to guarantee. Even some special-shaped parts cannot be processed at all, such as the current folding of 90° deep grooved workpieces. Bending can not be achieved by using a bending machine. The current common practice is to use a method of welding and patchwork. The workpieces that are often produced are easily deformed and need to be manually corrected. Therefore, this method is time-consuming and labor-intensive, and the processed workpiece is not standardized and is easily deformed. Therefore, the current processing method is very unsatisfactory.

In view of this, the present invention has been specifically proposed.

Summary of the invention

SUMMARY OF THE INVENTION It is an object of the present invention to provide a device for compressing a groove profile having a bending angle of less than or equal to 90° without requiring a straightening process, a workpiece size that is produced, and which is not easily deformed.

In order to solve the above technical problems, the basic idea of adopting the technical solution of the present invention is:

A device for pressing a groove profile having a bending angle of less than or equal to 90°, comprising a coaxially disposed upper die combination and a lower die combination;

The upper mold combination includes:

The sling sleeve is a multi-petal structure with elastic connection, the outer part is a narrow and wide wedge mold; and the sling core, in the middle hole of the swell sleeve, at least the middle hole and the expansion core of the swell sleeve One of the upper and lower wedge shapes, the lowest point height of the expansion core in the uncompressed initial state is higher than the lowest point height of the expansion sleeve, and the expansion core and the expansion sleeve are gap-fitted with relative locking between the two. The mechanism of the relative locking mechanism is: a transverse support rod is connected between the oppositely facing petals of the expansion sleeve, the expansion core is a structure having a longitudinal sliding groove in the middle portion, and an elastic member is arranged in the longitudinal sliding groove thereof. The lateral support rod passes through the longitudinal sliding groove of the expansion core, and the bottom of the elastic member is placed on the lateral support rod in the longitudinal sliding groove of the expansion core;

The lower die combination includes:

a female die comprising an elastically connected multi-lobed structure, the recess of the female die being a wedge-shaped groove adapted to the outer shape of the expansion sleeve, such that the expansion sleeve can enter the groove of the inner groove; The outer concave mold has a groove having an upper width and a lower width, and the inner concave mold has an elastic body in the outer concave mold and below the inner concave mold.

Preferably, the multi-valve valve bodies of the expansion sleeve are elastically connected by the following structure:

The opposite sides of the expansion sleeve are connected by a transverse spring rod, and the spring rod includes the lateral support rod and the spring The specific connection relationship between the expansion sleeve and the spring rod is: a stepped hole having a small inside and a large inside is disposed on the inner wall of the expansion sleeve, and the two ends of the lateral support rod respectively extend into the stepped holes of the two sides of the valve body Inside, and at the end of the lateral support rod extending into the large hole of the stepped hole, the spring is installed, and a limit retaining ring is installed at each end of the spring, and the size of the inner limit retaining ring is larger than the stepped hole. The pore size of the hole.

Preferably, the elastic connection is achieved between the multi-valve bodies of the expansion sleeve by means of circumferentially connecting the elastic members.

Preferably, the relative locking mechanism further comprises an upward stop locking assisting mechanism of the expansion core relative to the expansion sleeve, wherein the upper stop locking assisting mechanism is specifically: the bottom of the expansion core has an expansion larger than the upper size a cap, a bottom of the hole in the expansion sleeve forms a flare larger than the upper portion, and the expansion cap cooperates with the flare.

Preferably, the bottom of the expansion cap is a flat bottom.

Preferably, the middle hole and the expansion core of the expansion sleeve are both upper and lower wedge shapes.

Preferably, the outer longitudinal section of the inner concave die is a trapezoidal shape that is upper and lower, and the outer wall inclination thereof is adapted to the inclination of the outer concave groove groove wall.

Preferably, the multi-lobed structure of the inner die is elastically connected at the bottom.

Preferably, a wear pad and a wear-resistant slide rail are sequentially arranged from top to bottom at the bottom of the inner concave die groove, and the inner concave die and the elastic body at the bottom of the inner die are sequentially arranged from top to bottom. Wear-resistant rails and wear pads.

Preferably, there is a positioning block at the bottom of the groove of the outer die.

Preferably, the outer concave mold is a multi-lobed structure, and the plurality of petals are supported by a laterally adjustable support rod;

The end of the lateral support rod connecting the multi-lobed expansion sleeve has an external thread, and the external thread is outside the limit retaining ring, and an adjusting nut is fitted with the external thread of the lateral support rod.

Preferably, the press provides a driving force for the upper mold combination.

The invention has the beneficial effects that the invention uses the mold to process the workpiece, the processing process is simple, the workpiece specifications are produced, the deformation is not easy, the trouble of manual correction is not needed, and the cost is saved.

DRAWINGS

Figure 1 is a schematic view of the overall structure of the present invention;

Figure 2 is a cross-sectional view of the combination of the upper mold and the lower mold of the present invention before pressing;

Figure 2a is a cross-sectional view of the first member of the expansion sleeve;

Figure 2b is an enlarged view of a portion A of Figure 2a;

Figure 2c is a front view of the expansion core;

Figure 2d is a view of the A-A of Figure 2c;

Figure 3 is a cross-sectional view showing the combination of the upper mold and the lower mold when the upper mold assembly is in contact with the workpiece to be processed at the time of pressing;

Figure 4 is a cross-sectional view showing the combination of the upper mold and the lower mold when the elastic body at the bottom of the inner mold is not deformed during pressing;

Figure 5 is a cross-sectional view showing the combination of the upper mold and the lower mold at the time of press forming of the workpiece;

Fig. 6 is a cross-sectional view showing the combination of the upper mold and the lower mold when the elastic body at the bottom of the inner mold returns to elastic deformation when the material is returned.

In the picture:

Punching Machine-1 Upper Die Combination-2 Lower Die Combination-3 Workpiece to Be Processed-4 Back Plate-5

Mounting bracket-6 First member-21 Stepped hole-211 Second member-22 Longitudinal chute-23

Expansion core-24 Spring rod-25 Lateral support rod-251 Spring-252 Elastic member-26

Expansion Cap -241 Outer Limiting Ring -271 Inner Limiting Ring -272 Adjusting Nut -273

First female mold member -311 second female mold member -312 Elastomer for connection -313

Wear pad -314 wear rail -315 first outer die member -321 second outer die member -322

Elastomer in the groove of the outer die -323 positioning block -324 adjustable support bar -325

detailed description

The present invention will be further described in detail below in conjunction with the drawings and embodiments.

Referring to Figure 2, the present invention is a device for pressing a groove profile having a bend angle of less than or equal to 90°, comprising a coaxially disposed upper die combination 2 and a lower die combination 3;

The upper mold assembly 2 includes:

The expansion sleeve is a multi-petal structure elastically connected, the outer part is a narrow and wide wedge mold; and the expansion core 24, in the middle hole of the expansion sleeve, at least one of the middle hole of the expansion sleeve and the expansion core 24 is The upper and lower wedges, the lowest point height of the expansion core 24 in the uncompressed initial state is higher than the lowest point height of the expansion sleeve, and the expansion core 24 and the expansion sleeve are gap-fitted with relative locking between the two. The mechanism of the relative locking mechanism is: a transverse support rod 251 is connected between the oppositely facing petals of the expansion sleeve, and the expansion core 24 is a structure having a longitudinal sliding groove 23 in the middle thereof, and is disposed in the longitudinal sliding slot 23 thereof. An elastic member 26, the lateral support rod 251 passes through the longitudinal sliding groove 23 of the expansion core, and the bottom of the elastic member 26 is placed on the lateral support rod 251 in the longitudinal sliding groove 23 of the expansion core;

The lower die assembly 3 includes:

a female die comprising an elastically connected multi-lobed structure, the recess of the female die being a wedge-shaped groove adapted to the outer shape of the expansion sleeve, such that the expansion sleeve can enter the groove of the inner groove;

The outer concave mold has a groove having an upper width and a lower width, and the inner concave mold has an elastic body 323 in the outer concave mold and below the inner concave mold.

Referring to Figure 1, the apparatus employs a conventional press 1 as a drive mechanism, and a press slider is coupled to the top of the expansion core.

Based on the above structure, the present invention will be described by way of specific examples.

Embodiment 1: This embodiment can process a grooved workpiece having two sides.

Referring to Figures 2-6, the expansion sleeve includes a pair of opposed first members 21 and second members 22, the first member 21 and the second member 22 being thinner from the top to the bottom and gradually from the top to the bottom. a side inclined plate; the first member 21 and the second member 22 are connected by a transverse spring rod 25, the spring rod 25 includes a lateral support rod 251 and a spring 252;

The specific connection relationship between the expansion sleeve and the spring rod 25 is as follows: in combination with FIG. 2a and FIG. 2b, the inner wall of the first member 21 and the second member 22 is provided with a stepped hole 211 which is small inside and outside, and the two ends of the lateral support rod Inserting into the stepped holes 211 of the two side members respectively, and inserting the springs 252 at the ends of the lateral support rods extending into the large holes of the stepped holes, and fixing the limit retaining rings at the ends of the springs 252 at each end, respectively 271 and 272, and the inner limiting ring 272 has a larger size than the stepped hole, and has an external thread at the end of the lateral supporting rod, the external thread is outside the limiting ring, and the lateral supporting rod The external thread is fitted with an adjustment nut 273 which adjusts the width of the expansion sleeve to machine the groove members of different groove widths.

The outer portion of the expanded sleeve is formed to form the above-mentioned elastically connected upper and lower wide-width two-sided structure, wherein the holes are upper and lower wedge-shaped holes.

The expansion core 24 is also a wedge shape which is large and small, and its longitudinal section is as shown in FIG. 2d. The expansion core 24 and the middle hole of the expansion sleeve are both wedge-shaped, which can ensure that when the expansion core descends the expansion sleeve, both of them The surface contact prevents the expansion of the expansion sleeve from being worn by the expansion core.

Referring to FIG. 2c and FIG. 2d, the expansion core 24 is a structure having a longitudinal sliding groove 23 in the middle portion, and an elastic member 26 (which may be a common spring in FIGS. 2-6) is disposed in the longitudinal sliding groove 23 thereof. The spring rod 25 passes through the longitudinal chute 23 of the expansion core, and the bottom of the elastic member 26 abuts against the spring rod 25 in the longitudinal slot 23 of the expansion core. The number of chutes is designed according to the length of the expansion core and the width of the workpiece 4 to be processed, for example, three laterally parallel arranged chutes and three spring rods 25 are designed. The plurality of chutes and the plurality of spring rods 25 can ensure that a plurality of points simultaneously apply force to the workpiece 4, and for the wider workpiece 4 to be processed, the workpiece can be simultaneously pressed down at various points, so that the processed workpiece is more Specifications, and will not damage the physical properties of the workpiece itself due to point-to-point tearing.

The structure in which the plurality of lobes of the expansion sleeve are connected by the spring rod and the longitudinal sliding groove of the expansion core and the elastic member structure in the sliding groove constitute an elastic connection between the above-mentioned relative locking mechanism and the expansion sleeve.

The relative locking mechanism further includes an upward stop locking assist mechanism of the expansion core relative to the expansion sleeve, and the up stop locking assist mechanism is specifically: the bottom of the expansion core 24 has an expansion cap larger than the upper size 241. The bottom of the hole in the expansion sleeve forms a flare larger than the upper portion, and the expansion cap 241 cooperates with the flare. The height of the expansion cap 241 of the expansion core 24 is less than the depth depth of the flare of the expansion sleeve bottom, ensuring that the lowest point height of the expansion core is higher than the lowest point height of the expansion sleeve in the uncompressed initial state.

The bottom of the expansion cap 241 is a flat bottom, so that when the bottom end is pressed to the bottom end, the expansion core and the bottom of the expansion sleeve form a large plane to ensure that the groove bottom of the processed workpiece is flat.

The female die includes a first female die member 311 and a second female die member 312, and the first female die member 311 and the second female die member 312 each have a longitudinal section of less than 90°. The bent structure is similar to an "L"-shaped structure having a bend angle of less than 90°; the first female mold member 311 and the second female mold member 312 are opposed to the recess of the outer female mold, and the first female mold member 311 A connecting elastic body 313 (which may be a common spring in FIGS. 2-6) is disposed between the bottom of the second female mold member 312; the outer surface of the inner concave mold is inclined inwardly so that the outer longitudinal section of the inner concave mold is The upper and lower small trapezoids, the inclination of the outer wall is adapted to the inclination of the groove wall of the outer concave mold, so that the inner concave mold can be attached to the outer concave mold under the action of the connecting elastic body 313, thereby Good extrusion of the workpiece.

The first female die member 311 and the second female die member 312 form a splicing seam at the bottom, and an elastic body 323 is disposed under each of the two female die members to ensure the first concave of the female die. The uniformity of lifting and lowering of the mold member 311 and the second female mold member 312 facilitates the processing of the workpiece.

An anti-wear pad 314 and a wear-resistant slide rail 315 are sequentially arranged from the top to the bottom of the inner concave mold groove, and the inner concave mold and the elastic body 323 at the bottom of the inner concave mold are sequentially arranged from top to bottom. Wear-resistant rails and wear pads. The wear-resistant slide rail and the wear-resistant pad are provided to reduce the friction between the workpiece and the inner die, the inner die and the pad when the workpiece is bent and formed, thereby preventing wear of the device.

The outer female mold includes a first outer female mold member 321 and a second outer female mold member 322, and the longitudinal cross-sections of the first outer female mold member 321 and the second outer female mold member 322 each have an inner angle slightly larger than 90°. The bent structure is similar to an "L" type structure having an inner angle greater than 90°; the first outer female mold member 321 and the second outer female mold member 322 are opposed to each other on a backing plate of the press operating platform, the first outer concave mold The member 321 and the second outer female member 322 are each supported by an adjustable support rod 325 mounted on the mounting seat 6 at both ends of the backing plate 5, and the backing plate 5 is placed on the table of the press, and the support rod 325 is mounted at one end. The seat 6 is threadedly coupled and secured by a nut to combine the two outer female mold members into the outer female slotted frame. The groove width of the outer die can be adjusted by adjusting the length of the screw.

Preferably, the inner and outer female molds are flush with the upper end in the uncompressed initial state.

A positioning block 324 is provided at the bottom of the groove of the outer die.

The working principle of this device is:

1. Referring to FIG. 2, the flat workpiece to be processed is first placed on the upper port of the lower die assembly (in the present embodiment, placed at the upper port of the outer die), and the outer dimension of the expansion sleeve is a1. A1 is the smallest, the inner cavity width is b1, and b1 is the largest.

2. Referring to Figure 3, when pressing, the slider of the press descends, and the expansion core and the expansion sleeve are driven downward, and the expansion sleeve first contacts the workpiece 4 to be processed; the slider of the press continues to descend, and the pressing force of the press does not reach at this time. The yield strength of the workpiece 4 to be machined, so this Only the expansion core continues to descend, the expansion sleeve does not move, the elastic member in the expansion core chute shrinks, and the workpiece does not bend. When the expansion core descends to the bottom of the expansion sleeve, the expansion sleeve opening is expanded, and the expansion core is also in contact. To the workpiece to be processed; at this time, the outer dimension of the expansion sleeve is a2, a2 is the largest, a2>a1, the inner cavity width is b2, b2=b1;

3. Referring to Figure 4, the press slider continues to descend, the press pressure exceeds the yield strength of the workpiece to be processed, the expansion sleeve and the expansion core bend the workpiece into the groove of the inner die (in order to The machined workpiece 4 can enter the deep groove of the mold. In the actual operation, the initial position of the mold should have a groove width slightly larger than the width of the lower end of the expansion core. At this time, the outer dimension of the expansion sleeve is a3, a3=a2, and the inner die The groove width is b3, b3=b1;

4. Referring to FIG. 5, the slider of the press continues downward, exceeding the resistance of the elastic body 323 at the bottom of the inner die, and the inner die descends. As the inner die descends, the outer die compresses the inner die inwardly. The connection between the molds is contracted by the elastic body 313, and when the inner concave mold descends to the bottom positioning block of the outer concave mold, the groove width of the inner concave mold is the smallest, and the workpiece is tightly pressed and tightened on the outer wall of the inner concave mold to form a predetermined Grooves. At this time, the outer dimension of the expansion sleeve is a4, a4=a2=a3, the inner cavity width is b4, b4 is the smallest, and b4<b3, the workpiece groove width is the smallest;

5. Returning material: Referring to Fig. 6, the elastic body 323 of the inner concave mold elastically recovers, and the inner concave mold is bounced upward, and the elastic member in the expansion core sliding groove is deformed and deformed, so that the relative movement of the expansion core and the expansion sleeve is restored to the initial state. In the state, as the inner concave mold is continuously raised, the inner concave groove width gradually becomes larger, and after the elastic body 323 is completely restored and deformed, the inner concave mold returns to the initial position, the groove width reaches the maximum, and then the press slider Under the lifting force, the expansion sleeve and the expansion core are taken out from the groove of the lower mold combination, and the workpiece can also be easily taken out from the groove of the lower mold combination. Since the groove width of the workpiece is the smallest at this time, the groove width of the inner die is b5, b5=b1, the smallest, and the outer dimension of the groove width of the outer die (ie, the outer dimension of the expansion sleeve) is a5, a5=a1, maximum Therefore, the upper mold combination can be easily taken out from the lower mold assembly, and the workpiece can be easily taken out. When the press slider brings the upper mold assembly out of the lower mold assembly, on the one hand, the elastic rods in the longitudinal sliding grooves of the spring rod, the expansion core and the expansion core are connected, and on the other hand, the expansion cap is lifted upward. Pulling the tension of the expansion sleeve, the two together work to bring the upper mold assembly completely out of the lower mold combination, which can prevent the spring rod from being deformed by the force, thereby ensuring the effective exit of the upper mold combination.

Embodiment 2: This embodiment can process a grooved workpiece having four sides.

The expansion sleeve includes opposite first and second members, and opposite third and fourth members; the four members are thin and thicker from top to bottom and gradually inclined to the sides. The four members are surrounded by a quadrangular pyramid shape forming a truncated top; the four members are connected by a transverse spring rod, the spring rod includes a lateral support rod and a spring; the specific connection relationship between the expansion sleeve and the spring rod is: The inner wall of the first member, the second member, the third member and the fourth member is provided with a stepped hole having a small inner and outer large, and a cross-shaped lateral support rod, the four ends of which extend into the stepped holes of the four members, respectively, and The spring is inserted into the end of the lateral support rod extending into the large hole of the stepped hole, and the retaining ring is installed at both ends of the spring at each end, and the size of the inner limiting retaining ring is larger than the small hole of the stepped hole Aperture with external thread at the end of the lateral support rod, external thread in the The outer side of the limiting retaining ring is fitted with an adjusting nut in cooperation with the external thread of the lateral supporting rod, and the adjusting nut can adjust the width of the expanding sleeve to process the groove members of different groove widths.

The outer portion of the expanded sleeve is formed to form the above-mentioned elastically connected upper and lower wide-width tetrahedral structure, wherein the holes are upper and lower wedge-shaped holes.

The expansion core is a quadrangular prism which is large and small, and the shape can ensure surface contact between the expansion core when the expansion sleeve is extended downward to prevent the expansion core from being worn on the expansion sleeve.

The expansion core is a structure having a longitudinal sliding groove in the middle portion, and has elastic members (which may be ordinary springs) in the longitudinal sliding grooves thereof, and the intersection points of the four lateral support rods are located in the longitudinal sliding grooves of the expansion core. The lower end of the elastic member is placed at a cross point of the lateral support rod.

The relative locking mechanism further includes an upward stop locking assisting mechanism of the expanding core relative to the expansion sleeve, wherein the upper dead center locking assisting mechanism is specifically: the bottom of the expanding core has an expanding cap larger than the upper size, A bottom of the hole in the expansion sleeve forms a flare larger than the upper portion, and the expansion cap cooperates with the flare. The height of the expansion cap of the expansion core is smaller than the depth of the expansion of the bottom of the expansion sleeve, ensuring that the lowest point height of the expansion core is higher than the lowest point height of the expansion sleeve in the uncompressed initial state.

The bottom of the expansion cap is a flat bottom, so that when the bottom end is pressed to the bottom end, the expansion core and the bottom of the expansion sleeve form a large plane to ensure that the groove bottom of the processed workpiece is flat.

The female die includes a first female die member, a second female die member, a third female die member, a fourth female die member, a fifth female die member, and a sixth female die member, six The longitudinal section of the female die member is a bent structure having an internal angle of less than 90°, and is similar to an "L" type structure having a bending angle of less than 90°; the first concave die member and the second female die member are opposed to each other, and the third The inner female mold member and the fourth female female mold member are opposed to each other on both sides of the first female mold member, and the fifth female mold member and the sixth female mold member are opposite to each other on both sides of the second female mold member. The six female die members are disposed in the grooves of the outer die;

Between the first female die member and the second female die member bottom, between the first female die member and the third female die member bottom, between the first female die member and the fourth female die member bottom a connecting elastic body is disposed between the bottom of the second female die member and the fifth female die member and between the second female die member and the bottom of the sixth female die member, and the six are connected through five connections. The elastic body forms the inner concave die into a four-sided grooved frame which can be enlarged and contracted; the outer wall of the six inner concave die members is inclined downward inwardly, so that the outer concave die forms a quadrangular prism shape, and the inclination of the outer wall is The inclination of the groove wall of the outer concave mold is adapted such that the inner concave mold can be engaged with the outer concave mold under the action of the elastic body for connection, thereby better pressing the workpiece.

The six female mold members form a joint seam at the bottom, and an elastic body is disposed under each of the six inner mold members to ensure The consistency of the six female mold members of the female mold is reduced, which facilitates the processing of the workpiece.

An anti-wear pad and a wear-resistant slide rail are sequentially arranged from bottom to bottom at the bottom of the inner concave mold groove, and wear-resistant sliding is arranged from top to bottom between the inner concave mold and the elastic body at the bottom of the inner concave mold. Rail and wear pad, wear-resistant slide rail and wear pad are used to reduce the friction between the workpiece and the inner die, the inner die and the pad during the bending of the workpiece, thereby preventing the wear of the device. .

The outer female mold includes a first outer female mold member, a second outer female mold member, a third outer female mold member, a fourth outer female mold member, a fifth outer female mold member and a sixth outer female mold member, six The longitudinal section of the female die member is a bent structure having an inner angle slightly larger than 90°, and is similar to an "L" type structure in which the bending angle is larger than 90°; the first outer female mold member and the second outer female mold member are opposed to each other, The third outer female mold member and the fourth outer female mold member are opposite to each other on both sides of the first outer female mold member, and the fifth outer female mold member and the sixth outer female mold member are opposite to each other of the second outer female mold member. On the side, the six outer female mold members are placed on the backing plate of the press operating platform, and the outer portions of the six outer female mold members are supported by adjustable support rods mounted on the mounting seats of the six ends of the backing plate, and the backing plate is placed On the table of the press, one end of the support rod is screwed to the mounting seat on the backing plate and fastened by a nut to combine the six outer female mold members into the outer female grooved frame. The groove width of the outer die can be adjusted by adjusting the length of the screw. In fact, it is preferred that the inner and outer female molds are flush with the upper end in the uncompressed initial state.

A bottom portion has a positioning block at a bottom portion of the recess of the outer die.

The working principle of this device can be referred to Figure 2-6.

1. Referring to FIG. 2, the flat plate type workpiece to be processed with the four corners cut off is first placed on the upper port of the lower mold assembly (in the present embodiment, it is placed at the upper port of the outer concave mold), and the outer portion of the expansion sleeve is at this time. The size is a1, a1 is the smallest, the inner cavity width is b1, and b1 is the largest.

2. Referring to Figure 3, when pressing, the slider of the press descends, driving the expansion core and the expansion sleeve to descend synchronously, and the expansion sleeve first contacts the workpiece to be processed; the slider of the press continues to descend, and the pressing force of the press does not reach the waiting time. The yield strength of the workpiece is processed. Therefore, only the expansion core continues to descend, the expansion sleeve does not move, the elastic member in the expansion core chute shrinks, and the workpiece does not bend. When the expansion core descends to the bottom of the expansion sleeve, the expansion sleeve opening is expanded. When the expansion core descends to the bottom of the expansion sleeve, the expansion sleeve is expanded, and the expansion core also contacts the workpiece to be processed; at this time, the outer dimension of the expansion sleeve is a2, a2 is the largest, a2>a1, the inner concave mold The groove width is b2, b2=b1;

4. Referring to Figure 5, the slider of the press continues to descend, exceeding the resistance of the elastic body at the bottom of the inner die, and the inner die descends. As the inner die descends, the outer die compresses the inner die inwardly, and the inner die is compressed. The connection between the ends is contracted by the elastomer, and the inner die is descended to the outside. When the bottom of the die is positioned, the groove width of the inner die is the smallest, and the workpiece is tightly pressed and clamped to the outer wall of the inner die to form a predetermined groove. At this time, the outer dimension of the expansion sleeve is a4, a4=a2=a3, the inner cavity width is b4, b4 is the smallest, and b4<b3, the workpiece groove width is the smallest;

5. Return material: Referring to Fig. 6, the elastic body at the bottom of the inner concave mold elastically recovers, and the inner concave mold is bounced upward, and the elastic member in the expansion core sliding groove recovers and deforms, so that the relative movement of the expansion core and the expansion sleeve returns to the initial state. As the inner concave mold rises continuously, the inner concave groove width gradually becomes larger. After the elastic body completely recovers and deforms, the inner concave mold returns to the initial position, the groove width reaches the maximum, and then the lifting of the pressing machine slider Under the force, the expansion sleeve and the expansion core are taken out from the groove of the lower mold combination, and the workpiece can also be easily taken out from the groove of the lower mold combination. Since the groove width of the workpiece is the smallest at this time, the groove width of the inner die is b5, b5=b1, the smallest, and the outer dimension of the groove width of the outer die (ie, the outer dimension of the expansion sleeve) is a5, a5=a1, maximum Therefore, the upper mold combination can be easily taken out from the lower mold assembly, and the workpiece can be easily taken out. When the press slider brings the upper mold assembly out of the lower mold assembly, on the one hand, the elastic rods in the longitudinal sliding grooves of the spring rod, the expansion core and the expansion core are connected, and on the other hand, the expansion cap is lifted upward. Pulling the tension of the expansion sleeve, the two together work to bring the upper mold assembly completely out of the lower mold combination, which can prevent the spring rod from being deformed by the force, thereby ensuring the effective exit of the upper mold combination.

The invention uses the mold to process the workpiece, the processing process is simple, the workpiece specifications are produced, the deformation is not easy, the trouble of correction is not needed, and the cost is saved. Driven by a press to automate the entire unit. This device is particularly effective in machining deep grooved workpieces.

The device of the invention can process a workpiece of 90°, as long as the inner angle of the inner die is designed to be slightly larger, such as 88°, 89°, etc., because the workpiece will expand slightly outward after the machining is completed, and the inner corner of the workpiece after unfolding It can reach 90°.

Since both the expansion sleeve and the outer concave mold have adjustable widths, the workpieces of different groove widths can be machined by adjusting the groove widths of the expansion sleeve and the outer mold.

According to the second embodiment, the present invention is also easy to perform a deformation process of a cylindrical workpiece of 90 or less.

The more the number of concave mold lobes when machining a multi-faceted grooved or cylindrical workpiece, the more perfect the workpiece.

The shape of the member of the expansion sleeve, the female mold member, and the outer female mold member may be other, and is not limited to the above embodiment.

The elastomer at the bottom of the inner die is preferably a urethane rubber block.

The device can use a hydraulic press, a hydraulic press, etc. to provide a driving force for the upper mold combination.

The multi-valve bodies of the expansion sleeve are elastically connected by means of circumferentially connecting elastic members to form a structure such as an elastic bracelet. The relative locking mechanism uses a separate lateral support compared with the above embodiment. The relevant structure of the rod and the expansion core can be matched.

This device can process workpieces such as steel plates.

The device can also process multi-faceted grooved workpieces, such as a five-sided shape and a six-sided shape.

For the above two embodiments, the expansion core may also be a square or a rectangular parallelepiped, but this structure has a disadvantage with respect to the above two embodiments that the point contact between the expansion core and the expansion sleeve is easy to wear the expansion sleeve. Or the middle hole of the expansion sleeve is an equal diameter hole, and the expansion core is wedge-shaped. Of course, this also has the above-mentioned problem of wear.

The above description is only a preferred embodiment of the present invention, and it should be noted that those skilled in the art can also make several improvements and retouchings without departing from the principles of the present invention. It should be considered as the scope of protection of the present invention.

Claims

A device for pressing a groove profile having a bending angle of less than or equal to 90°, characterized in that it comprises a combination of an upper die and a lower die disposed coaxially; the combination of the upper die comprises: an expansion sleeve, which is a multi-petal elastic connection a structure, the outer portion is a narrow and wide wedge mold; and an expansion core, in the middle hole of the expansion sleeve, at least one of the middle hole and the expansion core of the expansion sleeve is a wedge shape that is upper and lower, and the expansion core is In the uncompressed initial state, the lowest point height is higher than the lowest point height of the expansion sleeve, and the expansion core and the expansion sleeve are gap-fitted, and a relative locking mechanism is installed between the two, the relative locking mechanism is: in the expansion sleeve pair A transverse support rod is connected between the disposed petals, the expansion core is a structure having a longitudinal sliding groove in the middle portion, and an elastic member is disposed in the longitudinal sliding groove thereof, and the lateral support rod passes through the longitudinal sliding of the expansion core a groove, the bottom of the elastic member is placed on a lateral support rod in the longitudinal sliding groove of the expansion core;

The lower die assembly includes: an inner die comprising an elastically connected multi-lobed structure, the recess of the inner die being a wedge-shaped groove adapted to an outer shape of the expansion sleeve, such that the expansion sleeve can enter the concave a groove in the groove; and an outer die having a groove having an upper width and a lower width, wherein the inner die has an elastic body in the groove of the outer die in the outer die Below the die.
The device according to claim 1, wherein the multi-valve valve bodies of the expansion sleeve are elastically connected by the following structure:

The opposite sides of the expansion sleeve are connected by a transverse spring rod, the spring rod includes the lateral support rod and the spring; the specific connection relationship between the expansion sleeve and the spring rod is: the inner wall of the expansion sleeve a stepped hole having a small inside and a large outer portion, wherein the two ends of the lateral support rod respectively extend into the stepped holes of the side flaps, and the end portions of the lateral support rods extending into the large holes of the stepped holes are provided The spring has a limit retaining ring at each end of the spring, and the size of the inner limit retaining ring is larger than the diameter of the stepped hole.
The device according to claim 1, wherein the elastic connection of the multi-valve bodies of the expansion sleeve is achieved by circumferentially connecting the elastic members.
The device according to claim 3, wherein the relative locking mechanism further comprises an upward stop locking assist mechanism of the expansion core relative to the expansion sleeve, and the up stop locking assist mechanism is specifically: The bottom of the expansion core has an expansion cap larger than the upper dimension, and the bottom of the expansion sleeve has a flare formed larger than the upper portion, and the expansion cap cooperates with the flare.
The device according to claim 4, wherein the bottom of the expansion cap is a flat bottom.
The apparatus according to any one of claims 1 to 5, wherein the intermediate hole and the expansion core of the expansion sleeve are both upper and lower wedge shapes.
The apparatus according to any one of claims 1 to 5, wherein the outer longitudinal section of the inner concave mold is a trapezoidal shape having a large upper and lower outer diameter, an outer wall inclination thereof, and a groove wall of the outer concave mold groove The inclination is adapted.
A device according to any one of claims 1 to 5, wherein the multi-lobed structure of the female die is elastically connected at the bottom.
The apparatus according to any one of claims 1 to 5, wherein a wear pad and a wear-resistant slide rail are provided in order from the top to the bottom of the inner concave mold groove, and the inner concave mold and The elastic bodies at the bottom of the inner die are provided with wear-resistant slide rails and wear-resistant pads in order from top to bottom.
A device according to any one of claims 1 to 5, wherein a positioning block is provided at the bottom of the groove of the outer die.
The device according to claim 2, wherein the outer concave mold has a multi-lobed structure, and the plurality of flaps are supported by a laterally adjustable support rod; and the end of the lateral support rod connecting the multi-lobed expansion sleeve has The external thread has an external thread outside the limiting collar, and an adjusting nut is fitted with the external thread of the lateral support rod.
A device according to any one of claims 1 to 5, characterized in that the driving force is provided by the press for the upper die combination.