CN211868429U

CN211868429U - Material taking mechanism capable of adjusting product direction and automatic punching system

Info

Publication number: CN211868429U
Application number: CN201922379654.0U
Authority: CN
Inventors: 范艇海
Original assignee: ZHUHAI YINGCHENG ELECTRONIC TECHNOLOGY CO LTD
Current assignee: ZHUHAI YINGCHENG ELECTRONIC TECHNOLOGY CO LTD
Priority date: 2019-12-25
Filing date: 2019-12-25
Publication date: 2020-11-06
Anticipated expiration: 2029-12-25

Abstract

The utility model provides a material taking mechanism capable of adjusting the direction of a product and an automatic punching system, wherein the material taking mechanism comprises a material taking mounting seat, a stirring part, a material taking part, a swinging part and a stirring driving component, the material taking mounting seat comprises a first support arm and a second support arm, and the first support arm is perpendicular to the second support arm; the stirring piece is positioned on the first support arm, and a connecting sliding hole is formed in the stirring piece; the material taking piece comprises a rotating shaft and a material taking head, the rotating shaft is rotatably arranged on the second support arm, the material taking head is positioned below the second support arm, and the material taking head is provided with an air suction hole; the swinging piece is connected between the rotating shaft and the connecting sliding hole, and is provided with a shifting column which can move in the connecting sliding hole; the poking driving component drives the poking piece to move linearly; this automatic die-cut system includes feeding agencies and die-cut mould, and feeding agencies is located the top of die-cut mould. The utility model discloses can improve work efficiency, can adjust the direction of product again.

Description

Material taking mechanism capable of adjusting product direction and automatic punching system

Technical Field

The utility model relates to a die-cut equipment technical field specifically is a feeding agencies and automatic die-cut system that relates to an adjustable product direction.

Background

The injection molding product material belt with the metal part is a common structure in the production process of injection molding products, the injection molding product material belt with the metal part comprises a connecting strip and a plurality of products, the products comprise the metal part and a plastic part, the plastic part is arranged on the metal part, and the metal part is connected with the connecting strip. After the injection molding is finished, the product needs to be separated from the connecting strip. The existing method for separating the product from the material belt is generally to pre-break the joint of the material belt and the metal piece, and then manually break and take off the metal piece from the material belt. The mode has the defects of low working efficiency and high labor intensity of workers. The existing punching die generally needs to be provided with a positioning driving device for driving an ejector rod to ascend and be connected with a product, so that the product is positioned, and the punching driving device also needs to be arranged for driving a punch to descend so as to separate the product from the material belt. The existing punching die has a complex structure, needs two driving devices and has higher cost.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a can adjust feeding agencies of product direction.

A second object of the present invention is to provide an automatic punching system capable of adjusting the direction of a product.

In order to achieve the first purpose, the utility model provides a material taking mechanism capable of adjusting the direction of a product, which comprises a material taking mounting seat, a stirring piece, a material taking piece, a swinging piece and a stirring driving component, wherein the material taking mounting seat comprises a first support arm and a second support arm, and the first support arm is perpendicular to the second support arm; the stirring piece is positioned on the first support arm, and a connecting sliding hole is formed in the stirring piece; the material taking piece comprises a rotating shaft and a material taking head, the rotating shaft is rotatably arranged on the second support arm, the material taking head is positioned below the second support arm, and the material taking head is provided with an air suction hole; the swinging piece is connected between the rotating shaft and the connecting sliding hole, and is provided with a shifting column which can move in the connecting sliding hole; and the poking driving assembly drives the poking piece to move linearly.

According to the scheme, the suction holes are formed in the material taking head and communicated with the vacuum generator, so that products can be quickly sucked, and the working efficiency is improved; through getting the material piece and dialling and set up the swing piece between the piece, when stirring drive assembly drive and dial a piece rectilinear movement, dial the piece and drive the swing piece and rotate around getting the material piece to realize the automatic adjustment of product direction, provide convenience for next process.

The further scheme is that the poking part comprises a first connecting plate and a second connecting plate, the first connecting plate is perpendicular to the second connecting plate, the first connecting plate is connected with the first support arm in a sliding mode, the second connecting plate is arranged above the second support arm in parallel, and the connecting sliding hole is located in the second connecting plate.

The further proposal is that the connecting slide hole is a waist circular hole, and the length direction of the waist circular hole is vertical to the moving direction of the stirring piece.

The further scheme is that the swinging piece comprises a first crank arm and a second crank arm, the first crank arm is perpendicular to the second crank arm, the first crank arm is sleeved on the rotating shaft, and the shifting column is located on the second crank arm.

The further scheme is that a positioning groove is arranged on the bottom wall of the material taking head and is positioned on one side of the air suction hole.

The further scheme is that a sleeve is arranged on the second support arm, the rotating shaft penetrates through the sleeve, and a spring is elastically abutted between the sleeve and the material taking head.

The material taking mechanism further comprises a rack, a linear sliding table module, a translation driving assembly, a material taking lifting driving assembly and a material taking fixing seat, wherein the linear sliding table module is arranged on the rack, the translation driving assembly drives the material taking fixing seat to move along the extending direction of the linear sliding table module, and the material taking lifting driving assembly drives the material taking mounting seat to move vertically on the material taking fixing seat.

The material taking mounting seat is provided with a stopping part which moves between the two hydraulic buffering assemblies.

In order to realize foretell second purpose, the utility model provides a pair of automatic die-cut system, including feeding agencies and die-cut mould, feeding agencies is foretell feeding agencies, and feeding agencies is located the top of die-cut mould.

Drawings

Fig. 1 is a structural diagram of a material belt for punching by applying the embodiment of the present invention.

Fig. 2 is a structural diagram of a punching mold according to an embodiment of the automatic punching system of the present invention.

Fig. 3 is a cross-sectional view of the automatic punching system according to the present invention before punching.

Fig. 4 is an enlarged view at C in fig. 3.

Fig. 5 is a cross-sectional view of the first bottom die moving upward relative to the second bottom die of the punching die according to the embodiment of the automatic punching system of the present invention.

Fig. 6 is a cross-sectional view of the automatic punching system according to the embodiment of the present invention when punching by the punching die.

Fig. 7 is a structural diagram of an upper die base of a punching die according to an embodiment of the automatic punching system of the present invention.

Fig. 8 is a block diagram of an embodiment of an automatic die cutting system of the present invention.

Fig. 9 is an enlarged view at a in fig. 8.

Fig. 10 is a cross-sectional view of a feed mechanism of an embodiment of the automatic die cutting system of the present invention.

Fig. 11 is an enlarged view at B in fig. 10.

Fig. 12 is a structural diagram of an embodiment of the material taking mechanism of the present invention.

Figure 13 is the structure diagram of the first visual angle of the material taking assembly of the embodiment of the material taking mechanism of the utility model.

Fig. 14 is a second view angle of the material-taking assembly according to the embodiment of the material-taking mechanism of the present invention.

Fig. 15 is a structure diagram of the material taking part for taking material according to the embodiment of the utility model.

Fig. 16 is a structural diagram of the material taking member rotating 90 ° according to the embodiment of the material taking mechanism of the present invention.

Fig. 17 is a structural diagram of a material taking member according to an embodiment of the present invention.

Fig. 18 is a structural view of a swing member according to an embodiment of the material taking mechanism of the present invention.

Fig. 19 is the structure diagram of the material taking component of the embodiment of the material taking mechanism for taking the material, which is used for taking the material from the material taking component.

The present invention will be further explained with reference to the drawings and examples.

Detailed Description

Referring to fig. 1, the material tape 1 includes two connecting strips 11 and a plurality of products, the plurality of products are uniformly arranged between the two connecting strips 11 at intervals along the extending direction of the connecting strips 11, and the connecting strips 11 are uniformly provided with a plurality of second positioning holes 13 at intervals along the extending direction thereof. The product includes metalwork 12 and plastic part 10, and plastic part 10 sets up in the middle part of metalwork 12, and the both sides of metalwork 12 are equipped with ear seat and third locating hole 14, and third locating hole 14 is located the middle part of ear seat, and ear seat and connecting strip 11 set up and form and treat die-cut region. The embodiment of the utility model provides a be used for from waiting die-cut district to separate product and two connecting strips 11 to take out the product.

Automatic die cutting system embodiments

Referring to fig. 2 to 7, the punching die 3 includes a fixed seat, a punching driving device 32, a first lifting seat 33, a second lifting seat 34, a lower die seat 35, a first bottom die 36, a second bottom die 37, and eight punches 38. The fixing seat comprises a bottom plate 311, an upper die seat 312 and two side plates 313, wherein the bottom 311 is connected to the bottoms of the two side plates 313, the upper die seat 312 is connected to the tops of the two side plates 313, and the bottom plate 311 and the upper die seat 312 are arranged in parallel. The punching driving device 32 is arranged on the bottom plate 311, and the first lifting seat 33, the second lifting seat 34, the lower die holder 35 and the upper die holder 312 are arranged in sequence from bottom to top.

The upper die holder 312 is provided with a first avoiding hole 314 and eight punch mounting grooves 315, and the first avoiding hole 314 is arranged in a rectangular shape. The eight punch mounting grooves 315 are symmetrically disposed on the hole walls of the long sides of the first avoiding hole 314, the upper portion of the punch 38 is located in the punch mounting grooves 315, and the lower portion of the punch 38 protrudes toward the center of the first avoiding hole 314 and extends toward the lower die holder 35. The punches 38 on both sides define an accommodating space 316 therebetween to facilitate the removal of product upwardly from between the punches 38 on both sides by the take off mechanism 4.

Be equipped with the second on the die holder 35 and dodge hole 351 and two first punch plates 352, two first punch plates 352 overlap joint on the second dodges the left and right sides of hole 351, form first silo 5 between first punch plates 352 and the die holder 35, first silo 5 is located the second and dodges the upper portion of hole 351 and dodges hole 351 intercommunication with the second, and the second dodges hole 351 and hold space 316 just to arranging and intercommunication each other. First silo 5 runs through die holder 35 along its self extending direction, makes things convenient for the feeding and the waste material ejection of compact of first silo 5, and the area 1 is located first silo 5 and can move along the extending direction of first silo 5. The first upper clamping plate 352 is provided with a plurality of first positioning holes 353 at intervals along the moving direction of the material belt, and the first positioning holes 353 are communicated with the first trough 5.

The bottom of the second bottom die 37 is arranged on the second lifting seat 34, and the upper part of the second bottom die 37 is vertically inserted into the first trough 5 and is located below the material belt 1. Eight second ejector rods 371 on the roof of second die block 37, eight second ejector rods 371 divide into two sets of symmetry and set up on the left and right sides of second die block, and second ejector rod 371 is located first locating hole 353 directly below for with first locating hole 353 clearance fit.

The bottom of the first bottom die 36 is arranged on the first lifting seat 33, the upper part of the first bottom die 36 penetrates through the second bottom die 37, penetrates up and down in the first trough 5 and is located below the material belt 1, and the first bottom die 36 can move up and down relative to the second bottom die 37. The top wall of the first bottom die 36 is higher than the top wall of the second bottom die 37, eight knife edges 361 and eight first push rods 362 are arranged on the top wall of the first bottom die 36, the knife edges 361 are located on the periphery of the first push rods 362 and are located on the left and right side edges of the first bottom die 36, and the knife edges 361 are located between the first push rods 362 and the second push rods 371. The cutting edge 361 and a to-be-punched area of a product are arranged vertically opposite to each other, the cutting edge 361 and the punch 38 are in punching fit, the punching fit means that a punching surface of the punch 38 and the cutting edge are arranged vertically and are separated from each other in the horizontal direction by a preset gap, and when the cutting edge 361 moves relative to the punch 38, the product is cut off from between the punch 38 and the cutting edge 361. The knife edge 361 is arranged opposite to the die cutting area of the product. The first lift pin 362 is located right below the third positioning hole 14 of the product, and is used for being in clearance fit with the third positioning hole 14.

The first lifting seat 33 and the second lifting seat 34 are separated by a first preset distance, the second lifting seat 34 and the lower die seat 35 are separated by a second preset distance, and the lower die seat 35 and the upper die seat 312 are separated by a third preset distance. The punching drive device 32 is located at the lower part of the first lifting seat 33, and the punching drive device 32 is an air cylinder or a hydraulic cylinder.

The top of the second ejector pin 371 is higher than the top of the first ejector pin 362 before die cutting.

During punching, the punching driving device 32 drives the first lifting seat 33 to ascend by a first preset distance, so that the first bottom die 36 moves towards the first trough 5, i.e. approaches the material belt 1, the first top rod 362 is located right below the third positioning hole 14 of the product, and at this time, the top of the first top rod 362 is higher than the top of the second top rod 371. The punching driving device 32 continues to drive the first lifting seat 33 to move upwards, the first lifting seat 33 pushes the second lifting seat 34 to move upwards by a second preset distance, so that the first bottom die 36 and the second bottom die 37 synchronously move towards the first trough 5, the first ejector rod 362 penetrates through the third positioning hole 14, the second ejector rod 371 penetrates through the second positioning hole 13 of the connecting strip 11 and is inserted into the first positioning hole 353 of the first upper clamping plate 352, the product and the connecting strip 11 are positioned in the left-right direction at the same time, and the connecting strip 11 and the product metal part 12 are in a tightened state. The punching drive device 32 then drives the first lifting seat 33 to move upwards, so that the second lifting seat 34 pushes the lower die seat 35 to move towards the punch 38, so that the first trough 5 and the material belt move towards the punch 38, and the punch 38 is located between the second ejector rod 371 and the first ejector rod 362 and is in infinite proximity to the knife edge 361 to perform a punching action, so that the product and the connecting strip 11 are separated from the area to be punched.

Referring to fig. 8, the automatic punching and material-taking device includes a feeding mechanism 2, a punching die 3 and a material-taking mechanism 4, the feeding mechanism 2 is located at a first side of the punching die 3 and is used for feeding materials to the punching die 3, a waste material discharging assembly is arranged at a second side of the punching die 3, and the waste material discharging assembly and the feeding mechanism 2 are located on the same straight line and are used for discharging a connecting strip 11; the taking mechanism 4 is located at an upper portion of the punching die 3, and is used for taking out a product from above the punching die 3.

Referring to fig. 9 to 11, the feeding mechanism 2 includes a feeding mounting base 21, a feeding driving motor 22, two material shifting gears 23, and two second upper clamping plates 24, where the two second upper clamping plates 24 are disposed in parallel on two sides of the top wall of the feeding mounting base 21, and a preset width is provided between the two second upper clamping plates 24. The feeding mounting seat 21 is fixedly connected with the lower die holder 35, so that the feeding mounting seat can move up and down along with the lower die holder 35. Form second silo 6 between second punch holder 24 and the pay-off mount pad 21, second silo 6 extends and communicates with first silo 5 to die-cut mould 3, and the connecting strip 11 of material area 1 is located second silo 6, and the product is located between two second punch holders 24.

The feeding driving motor 22 is a servo motor, the feeding driving motor 22 is horizontally arranged on the side wall of the feeding mounting seat 21, and the two material shifting gears 23 are arranged on the rotating shaft 471 of the feeding driving motor 22 and are positioned below the top wall of the feeding mounting seat 21. The top wall of pay-off mount pad 21 runs through and is equipped with holding tank 211, and holding tank 211 communicates from top to bottom with second silo 6. The upper part of the material stirring gear 23 is positioned in the accommodating groove 211, a plurality of teeth 231 are uniformly arranged on the circumference of the material stirring gear 23 at intervals, and the trough teeth 231 are inserted into the second positioning hole 13 of the connecting bar 11. The distance between two adjacent second positioning holes 13 is equal to the pitch of the material shifting gear 23. The two material shifting gears 23 are respectively connected with the corresponding connecting strips 11, and the rotating direction of the material shifting gears 23 is tangent to the feeding direction of the second material groove 6. When the feeding driving motor 22 drives the two material shifting gears 23 to synchronously rotate in the same direction, the material shifting gears 23 drive the material belt 1 to move along the extending direction of the second trough 6, so that the automatic feeding of the punching die 3 is realized.

Material taking mechanism embodiment capable of adjusting product direction

Referring to fig. 12, and combining fig. 8, the material taking mechanism 4 capable of adjusting the product direction includes a frame 401, a linear sliding table module 402, a translational driving assembly and a material taking assembly, the frame 401 is located at the second side of the punching die 3, the linear sliding table module 402 is located on the frame 401, the material taking assembly is arranged on the linear sliding table module 402, the translational driving assembly drives the material taking assembly to move along the extending direction of the linear sliding table module 402, and the extending direction of the linear sliding table module 402 is perpendicular to the feeding direction.

Referring to fig. 13 to 16, the material taking assembly includes a material taking fixed seat 41, a material taking mounting seat 42, a material taking lifting drive assembly 43, a toggle member 44, a toggle drive assembly 45, four swinging members 46, and four material taking members 47. Get material fixing base 41 and sharp slip table module 402 and be connected, get material lifting drive assembly 43 drive and get material mount pad 42 along vertical removal on getting material fixing base 41, get material lifting drive assembly 43 and establish to the cylinder. Get material fixing base 41 both sides from top to bottom and all be equipped with hydraulic buffer assembly 48, get and be equipped with backstop portion 411 on the material mount pad 42, backstop portion 411 reciprocates between two hydraulic buffer assembly 48.

The reclaiming mount 42 includes a first arm 421 and a second arm 422, and the first arm 421 is perpendicular to the second arm 422. The take-off lift drive assembly 43 is connected to the top wall of the first arm 421. The toggle member 44 is slidably disposed on a side wall of the first arm 421 along the feeding direction, and the left and right sides of the first arm 421 are respectively provided with a baffle 423 for abutting against an end of the toggle member 44 to prevent the toggle member 44 from being separated from the first arm 421.

The toggle member 44 includes a first connecting plate 441 and a second connecting plate 442, the first connecting plate 441 is perpendicular to the second connecting plate 442, and the first connecting plate 441 is slidably connected to the first arm 421. The second connecting plate 442 has four connecting sliding holes 443, the four connecting sliding holes 443 are uniformly arranged along the extending direction of the toggle 44, the connecting sliding holes 443 are preferably circular waist holes, and the length direction of the circular waist holes is perpendicular to the feeding direction. The toggle driving assembly 45 is located on the side wall of the first arm 421 and drives the toggle member 44 to move linearly along the feeding direction.

Second support arm 422 is equipped with four sleeves 424 along the pay-off direction, gets material 47 and includes rotation axis 471 and gets material head 472, gets material head 472 and establishes to the cuboid structure, gets the width and the length of material head 472 and all is less than accommodation space 316's width for get material head 472 can pass through accommodation space 316 between the drift 38 of both sides and insert and adorn in first silo 5. The rotating shaft 471 penetrates through the sleeve 424 to be connected with the material taking head 472 positioned below the second support arm 422, the rotating shaft 471 is rotatably connected with the sleeve 424, and a spring 473 is elastically abutted between the material taking head 472 and the bottom wall of the sleeve 424.

Referring to fig. 17, the bottom wall of the material taking head 472 is provided with positioning recesses 474 and four suction holes 475, the suction holes 475 are located on the outer peripheries of the positioning recesses 474 and are disposed between the two positioning recesses 474, and the suction holes 475 communicate with a vacuum generator.

Referring to fig. 18, the swinging member 46 is connected between the material taking member 47 and the toggle member 44, and the swinging member 46 includes a first crank arm 461, a second crank arm 462 and a toggle post 463, and the first crank arm 461 is perpendicular to the second crank arm 462.

As shown in fig. 15 and 16, the first crank arm 461 is fixed to the rotating shaft 471, the toggle post 463 is positioned on the second crank arm 462 and perpendicular to the top wall of the second crank arm 462, and the toggle post 463 is movable in the connecting slide hole 443. In an initial state, the toggle column 463 is located at the first end of the connecting sliding hole 443, the length direction of the material taking head 472 is perpendicular to the feeding direction, and the material taking head 472 is inserted into the first trough 5 to take materials; when the toggle driving assembly 45 drives the toggle member 44 to move linearly along the direction opposite to the feeding direction, the toggle pin 463 moves to the second end of the connecting sliding hole 443 relative to the toggle member 44, so that the swinging member 46 and the material taking member 47 rotate together counterclockwise by 90 °, and at this time, the length direction of the material taking head 472 is parallel to the feeding direction, and the product direction is turned by 90 °.

Referring to fig. 19, the material taking head 472 is vertically inserted into the first trough 5 and located right above the first bottom die 36, when the material taking member 47 moves downward, the positioning groove 474 is in clearance fit with the first ejector rod 362 for realizing the relative positioning of the material taking head 472 and the product metal member 12, and at this time, the spring 473 is compressed by the extrusion, so that the bottom wall of the material taking head 472 is tightly attached to the surface of the product metal member 12. At this time, the vacuum generator may be started, so that a vacuum environment is formed between the suction hole 475 and the metal piece 12 for sucking the product, at this time, the material taking driving assembly drives the material taking mounting seat 42 to move upwards to drive the material taking head 472 and the product to ascend together, after the product is separated from the punching die 3, the driving assembly 45 is shifted to drive the shifting member 44 to linearly move along the direction opposite to the feeding direction, so that the direction of the product can be adjusted, and convenience is provided for the next process.

Above-mentioned embodiment is only the utility model discloses a preferred embodiment, in practical application, can make the adjustment to the die-cut mould, for example, be equipped with on the die-cut mould and be more than eight drifts, correspondingly, be equipped with the edge of a knife with the drift one-to-one on the first die block to make die-cut mould die-cut a plurality of products simultaneously, in order to improve production efficiency. For another example, a punching die is provided as a one-sided punch for punching the web of product to which the one-sided connecting strip is connected. In practical application, the material taking assembly can be adjusted, for example, a stirring piece in the material taking assembly can move along the feeding direction to drive the material taking piece to rotate by 90 degrees.

Above-mentioned embodiment is only the utility model discloses a preferred embodiment, in practical application, can make the adjustment to getting the material piece, for example, get the overhead accessible magnet or the electro-magnet of getting of material piece for be connected with the metalwork of product. For another example, the number of the material taking parts is four, so that the number of products taken out at a time is increased, and the working efficiency is improved.

Claims

1. The utility model provides a feeding agencies of adjustable product direction which characterized in that includes:

the material taking mounting seat comprises a first support arm and a second support arm, and the first support arm is perpendicular to the second support arm;

the shifting piece is positioned on the first support arm, and a connecting sliding hole is formed in the shifting piece;

the material taking part comprises a rotating shaft and a material taking head, the rotating shaft is rotatably arranged on the second support arm, the material taking head is positioned below the second support arm, and the material taking head is provided with a suction hole;

the swinging piece is connected between the rotating shaft and the connecting sliding hole, and a shifting column is arranged on the swinging piece and can move in the connecting sliding hole;

and the poking driving assembly drives the poking piece to move linearly.

2. The take off mechanism as in claim 1, wherein:

the poking piece comprises a first connecting plate and a second connecting plate, the first connecting plate is perpendicular to the second connecting plate, the first connecting plate is connected with the first support arm in a sliding mode, the second connecting plate is arranged above the second support arm in parallel, and the connecting sliding hole is located in the second connecting plate.

3. The take off mechanism as claimed in claim 2, wherein:

the connecting sliding hole is a waist round hole, and the length direction of the waist round hole is perpendicular to the moving direction of the poking piece.

4. The take off mechanism as in claim 1, wherein:

the swing piece comprises a first crank arm and a second crank arm, the first crank arm is perpendicular to the second crank arm, the first crank arm is sleeved on the rotating shaft, and the shifting column is located on the second crank arm.

5. The take off mechanism as in claim 1, wherein:

a positioning groove is formed in the bottom wall of the material taking head and is located on one side of the air suction hole.

6. The take off mechanism as claimed in claim 5, wherein:

the second support arm is provided with a sleeve, the rotating shaft penetrates through the sleeve, and a spring is elastically abutted between the sleeve and the material taking head.

7. The reclaiming mechanism as claimed in any one of claims 1 to 6, wherein:

the material taking mechanism further comprises a rack, a linear sliding table module, a translation driving assembly, a material taking lifting driving assembly and a material taking fixing seat, wherein the linear sliding table module is arranged on the rack, the translation driving assembly drives the material taking fixing seat to move along the extending direction of the linear sliding table module, and the material taking lifting driving assembly drives the material taking mounting seat to vertically move on the material taking fixing seat.

8. The take off mechanism as claimed in claim 7, wherein:

get the upper and lower both sides of material fixing base and all be equipped with hydraulic buffer assembly, it is equipped with backstop portion to get the material mount pad, backstop portion is two remove between the hydraulic buffer assembly.

9. An automatic die cutting system, characterized by: the punching die comprises a material taking mechanism and a punching die, wherein the material taking mechanism is the material taking mechanism in any one of the claims 1 to 8, and the material taking mechanism is positioned above the punching die.