Automobile part forming die

Abstract

The invention relates to the field of forming dies, in particular to an automobile part forming die which comprises a mounting component, an upper die, a lower die and a bottom plate arranged on the upper die and the lower die. The fixing part comprises a bolt assembly arranged on the upper mold and the lower mold, a guide assembly arranged on the bottom plate, a clamping assembly arranged on the bolt assembly and a locking assembly arranged on the guide assembly; the dismounting part comprises a reset assembly arranged on the guide assembly, a pushing assembly arranged on the reset assembly and a thread assembly arranged on the pushing assembly; and the warning component comprises an acousto-optic assembly arranged on the bottom plate and a trigger assembly arranged on the plug pin assembly, the device can quickly replace or disassemble the upper mold or the lower mold, the design area of the upper mold or the lower mold can be enlarged, and the design efficiency of the upper mold or the lower mold can be improved. And meanwhile, an alarm can be automatically given when the upper die or the lower die is loosened.

Description

Technical Field

[0001] The present invention relates to the field of forming molds, and in particular to a forming mold for automotive parts. Background Art

[0002] Automotive parts include support parts, door panels, various sheet metals, etc. When producing door panels, the common method is stamping, and in this case, a stamping machine is required. Since the shape of the door panel has concavities and convexities, a forming mold is needed for stamping the door panel.

[0003] During use, the existing forming molds are divided into an upper mold and a lower mold. Since different models of door panels need to be produced during the forming process, the upper mold and the lower mold need to be replaced. The existing upper mold and lower mold are fixed by multiple bolts. Therefore, when disassembling and installing, multiple bolts need to be rotated. Since only one bolt can be rotated at a time, the required time is relatively long, making the installation or disassembly inconvenient. Moreover, due to the installation of bolts, blank spaces need to be left around the mold for installing hole positions, thus compressing the design space of the mold. Summary of the Invention

[0004] In view of the problem that when disassembling and installing the upper mold or the lower mold in the above or existing technologies, multiple bolts need to be rotated, making the installation or disassembly inconvenient, and due to the installation of bolts, blank spaces need to be left around the mold for installing hole positions, thus compressing the design space of the mold, the present invention is proposed.

[0005] To solve the above technical problems, the present invention provides the following technical solutions: It includes an installation component, which includes an upper mold and a lower mold, and a bottom plate arranged on the upper mold and the lower mold; a fixing component, which includes a pin assembly arranged on the upper mold and the lower mold, a guiding assembly arranged on the bottom plate, a clamping component arranged on the pin assembly, and a locking component arranged on the guiding assembly; a disassembling component, which includes a reset component arranged on the guiding assembly, a pushing component arranged on the reset component, and a threaded component arranged on the pushing component; a warning component, which includes a sound and light component arranged on the bottom plate, and a triggering component arranged on the pin assembly.

[0006] As a preferred solution of the forming mold for automotive parts of the present invention, wherein: the pin assembly includes four slots arranged on the bottom plate, and pins matching the slots are arranged on the upper mold and the lower mold, and both the slots and the pins are square.

[0007] As a preferred solution of the forming mold for automotive parts of the present invention, wherein: the guiding assembly includes an extension groove arranged on the slot, a first vertical groove is arranged in the extension groove, an arc groove is communicated with the first vertical groove, and a transverse groove is communicated with the arc groove.

[0008] As a preferred embodiment of the automotive parts forming die of the present invention, wherein: the engaging component includes an inner groove provided on the bolt, an extension plate slidably connected in the inner groove and cooperating with the extension groove, a cylinder fixedly connected to the extension plate and cooperating with the first vertical groove, the arc groove and the horizontal groove, and the extension plate is elastically connected to the inner wall of the inner groove through a first spring.

[0009] As a preferred embodiment of the automotive parts forming die of the present invention, wherein: the locking component includes a mounting groove provided on the extension groove, an L-shaped plate slidably connected in the mounting groove, the L-shaped plate is elastically connected to the inner wall of the mounting groove through a second spring, and the L-shaped plate is provided with an arc edge cooperating with the cylinder.

[0010] As a preferred embodiment of the automotive parts forming die of the present invention, wherein: the reset component includes a receiving cavity provided on the bottom plate, a second vertical groove penetrating the bottom plate is provided on the horizontal groove, two communication grooves communicating with the receiving cavity are provided in the second vertical groove, an arc-shaped block is slidably connected in the communication groove, and the two arc-shaped blocks are fixedly connected through a connecting block.

[0011] As a preferred embodiment of the automotive parts forming die of the present invention, wherein: the pushing component includes two moving plates slidably connected in the mounting cavity, mounting ports are provided on both the two moving plates and the connecting block, a rotating shaft is fixedly connected in the mounting port, the rotating shaft on the moving block is rotatably connected with a transmission plate, and the transmission plate is rotatably connected with the rotating shaft on the moving plate.

[0012] As a preferred embodiment of the automotive parts forming die of the present invention, wherein: the threaded component includes a threaded port provided on the moving plate, a double-headed threaded rod is threadedly connected in the threaded port, the left and right ends of the double-headed threaded rod have opposite thread directions, the double-headed threaded rod is rotatably connected to the inner wall of the receiving cavity, a through port is provided on the receiving cavity, a transmission shaft fixed to the double-headed threaded rod is rotatably connected in the through port, and a turntable is fixedly connected to the transmission shaft.

[0013] As a preferred embodiment of the automotive parts forming die of the present invention, wherein: the sound and light component includes an alarm fixedly connected to the bottom plate, and a circle of light strips is fixedly connected to the side wall of the bottom plate.

[0014] As a preferred embodiment of the automotive parts forming die of the present invention, wherein: the triggering component includes two pairs of first trigger pieces fixedly connected in the inner groove and the slot, and a pair of second trigger pieces cooperating with the first trigger pieces are fixedly connected to both the extension plate and the bolt.

[0015] Beneficial effects of the automotive parts forming die of the present invention: By providing an installation component and a fixing component, when fixing the upper die or the lower die, only need to insert the pin on the upper die into the slot on the bottom plate, and then push the upper die to fix the upper die. And because the fixing method is to fix the top of the upper die, there is no need to penetrate the upper die, so that the upper die can have a larger space in design. A disassembly component is also provided. When disassembling, only need to rotate the turntable to make the limit contact of the cylinder, and then pull out the upper die to disassemble. At the same time, a warning component is also provided. When the cylinder breaks, it can automatically give an early warning to avoid loosening of one of the four corners affecting the forming quality. Thus, it solves the problem that when disassembling and installing the upper die or the lower die, multiple bolts need to be rotated, making the installation or disassembly inconvenient, and because of the bolt installation, blank spaces need to be left around the die for the installation holes, thus compressing the die design space, achieving the effects of convenient installation and disassembly of the upper die or the lower die, larger design space for the upper die and the lower die, and automatic alarm when the upper die is loose. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0017] Figure 1 It is a schematic diagram of the external structure of the automotive parts forming die.

[0018] Figure 2 It is a schematic sectional view of the automotive parts forming die.

[0019] Figure 3 For Figure 2 the enlarged schematic view of the structure at A of

[0020] Figure 4 It is a sectional view of the locking assembly of the automotive parts forming die.

[0021] Figure 5 It is a schematic sectional view of the threaded assembly of the automotive parts forming die.

[0022] Figure 6 It is a schematic sectional view of the pushing assembly of the automotive parts forming die.

[0023] Figure 7 It is a diagram of the internal wire routing of the warning component of the automotive parts forming die.

[0024] In the figure: 100, mounting component; 101, upper die; 102, lower die; 103, bottom plate; 200, fixing component; 201, pin assembly; 201a, slot; 201b, pin; 202, guiding component; 202a, extension slot; 202b, first vertical slot; 202c, arc slot; 202d, horizontal slot; 203, engaging component; 203a, inner groove; 203b, extension plate; 203c, cylinder; 203d, first spring; 204, locking component; 204a, mounting slot; 204b, L-shaped plate; 204c, second spring; 204d, arc edge; 300, disassembly component; 301, reset component; 301a, accommodating cavity; 301b, second vertical slot; 301c, connecting slot; 301d, arc block; 301e, connecting block; 302, pushing component; 302a, moving plate; 302b, mounting opening; 302c, transmission plate; 303, threaded component; 303a, double-headed threaded rod; 303b, through opening; 303c, transmission shaft; 303d, turntable; 400, warning component; 401, sound and light component; 401a, alarm; 401b, light bar; 402, triggering component; 402a, first trigger piece; 402b, second trigger piece. Detailed implementation manners

[0025] To make the above objects, features, and advantages of the present invention more obvious and understandable, the following detailed description of the specific implementation manners of the present invention will be given in conjunction with the accompanying drawings of the specification.

[0026] Example 1, referring to Figures 1 to 7 , which is the first embodiment of the present invention. This embodiment provides an automotive parts forming die that can achieve the effect of fixing the upper die 101 or the lower die 102 without rotating multiple bolts. It includes a mounting component 100, including an upper die 101 and a lower die 102, a bottom plate 103 provided on the upper die 101 and the lower die 102, a fixing component 200, including a pin assembly 201 provided on the upper die 101 and the lower die 102, a guiding component 202 provided on the bottom plate 103, an engaging component 203 provided on the pin assembly 201, and a locking component 204 provided on the guiding component 202; a disassembly component 300, including a reset component 301 provided on the guiding component 202, a pushing component 302 provided on the reset component 301, and a threaded component 303 provided on the pushing component 302; a warning component 400, including a sound and light component 401 provided on the bottom plate 103, and a triggering component 402 provided on the pin assembly 201.

[0027] Specifically, the shapes of the upper die 101 and the lower die 102 here are changed according to the shape to be processed. However, no matter how they are changed, they can cooperate with the bottom plate 103. The bottom plate 103 here is connected with a hydraulic cylinder, which can provide extrusion force for the bottom plate 103. This is the prior art and will not be elaborated here.

[0028] Further, the pin assembly 201 includes four slots 201a provided on the bottom plate 103. The upper die 101 and the lower die 102 are provided with pins 201b that cooperate with the slots 201a. Both the slots 201a and the pins 201b are square; the guiding assembly 202 includes an extension groove 202a provided on the slot 201a. A first vertical groove 202b is provided in the extension groove 202a. An arc groove 202c is communicated with the first vertical groove 202b. A horizontal groove 202d is communicated with the arc groove 202c. The fact that both the slots 201a and the pins 201b are square can prevent relative rotation between the pins 201b and the slots 201a.

[0029] Preferably, the engaging assembly 203 includes an inner groove 203a provided on the pin 201b. An extension plate 203b that cooperates with the extension groove 202a is slidably connected in the inner groove 203a. A cylinder 203c that cooperates with the first vertical groove 202b, the arc groove 202c, and the horizontal groove 202d is fixedly connected to the extension plate 203b. The extension plate 203b is elastically connected to the inner wall of the inner groove 203a through a first spring 203d; the locking assembly 204 includes a mounting groove 204a provided on the extension groove 202a. An L-shaped plate 204b is slidably connected in the mounting groove 204a. The L-shaped plate 204b is elastically connected to the inner wall of the mounting groove 204a through a second spring 204c. An arc edge 204d that cooperates with the cylinder 203c is provided on the L-shaped plate 204b.

[0030] It should be noted that the horizontal groove 202d is completely outside the first vertical groove 202b. Thus, when the cylinder 203c is in the horizontal groove 202d, the first spring 203d is still in a stretched state. Therefore, the first spring 203d has a tendency to contract, causing a force acting on the extension plate 203b towards the first spring 203d, making the cylinder 203c abut against the inner wall of the horizontal groove 202d and not easily move. The setting of the arc edge 204d prevents the cylinder 203c from getting stuck with the L-shaped plate 204b. At the same time, the elastic force of the first spring 203d here is greater than the elastic force of the second spring 204c, ensuring that there is enough force to push the L-shaped plate 204b upward.

[0031] During use, when it is necessary to fix the upper die 101 or the lower die 102 to the bottom plate 103, just align the pin 201b on the upper die 101 (similarly for the lower die 102) with the slot 201a, and then push the upper die 101 upward (here, the upper die 101 can be pushed manually. If the upper die 101 is heavy, the elevator can be pushed. The pushing method here is not unique and can be selected according to needs). When the upper die 101 is pushed, it drives the extension plate 203b to move upward. At this time, the extension plate 203b enters the extension groove 202a, and the cylinder 203c enters the first vertical groove 202b. As the pin 201b continues to enter the slot 201a, it can drive the vertical groove into the arc-shaped groove 202c, driving the extension plate 203b to move away from the first vertical groove 202b. The first spring 203d elongates. When the upper end of the pin 201b abuts against the inner top of the slot 201a, the bottom plate 103 abuts against the upper die 101. The cylinder 203c moves into the horizontal groove 202d. Under the action of the first spring 203d, the extension plate 203b resets, driving the cylinder 203c to reset, so that the cylinder 203c moves in the horizontal groove 202d. When the cylinder 203c abuts against the arc edge 204d on the L-shaped plate 204b, it can drive the L-shaped plate 204b to move upward, and the second spring 204c is compressed. As the cylinder 203c abuts against the inner wall of the horizontal groove 202d, at this time, the cylinder 203c completely moves to one side of the L-shaped plate 204b. Under the action of the second spring 204c, the L-shaped plate 204b resets, and the non-arc edge 204d of the L-shaped plate 204b abuts against the cylinder 203c, which can prevent the cylinder 203c from resetting. At this time, the cylinder 203c cannot move up, down, left, or right, so that the extension plate 203b cannot move, and the pin 201b cannot move, thus fixing the upper die 101 to the bottom plate 103.

[0032] In summary, by setting the fixing component 200, when fixing the upper die 101 to the bottom plate 103, just align the pin 201b on the upper die 101 with the slot 201a, and then push the upper die 101 to fix the upper die 101 to the bottom plate 103. There is no need to rotate multiple bolts, and the fixing is more rapid and convenient.

[0033] Example 2, refer to Figures 1 to 6, which is the second embodiment of the present invention. Different from the previous embodiment, this embodiment provides a disassembly component 300 for an automotive parts forming die, which solves the problem of how to quickly disassemble the upper die 101 or the lower die 102. It includes a reset component 301, which includes a receiving cavity 301a provided on the bottom plate 103. A second vertical groove 301b penetrating the bottom plate 103 is provided on the transverse groove 202d. Two communication grooves 301c communicating with the receiving cavity 301a are provided in the second vertical groove 301b. An arc-shaped block 301d is slidably connected in the communication groove 301c. The two arc-shaped blocks 301d are fixedly connected by a connecting block 301e; the pushing component 302 includes two moving plates 302a slidably connected in the installation cavity. Installation ports 302b are provided on both the two moving plates 302a and the connecting block 301e. A rotating shaft is fixedly connected in the installation port 302b. A transmission plate 302c is rotatably connected to the rotating shaft on the moving block. The transmission plate 302c is rotatably connected to the rotating shaft on the moving plate 302a; the threaded component 303 includes a threaded port provided on the moving plate 302a. A double-headed threaded rod 303a is threadedly connected in the threaded port. The left and right ends of the double-headed threaded rod 303a have opposite thread directions. The double-headed threaded rod 303a is rotatably connected to the inner wall of the receiving cavity 301a. A through port 303b is provided on the receiving cavity 301a. A transmission shaft 303c fixed to the double-headed threaded rod 303a is rotatably connected in the through port 303b. A turntable 303d is fixedly connected to the transmission shaft 303c.

[0034] Specifically, the two arc-shaped blocks 301d are respectively arranged between the arc-shaped groove 202c and the transverse groove 202d and at the lower end of the arc-shaped groove 202c. In the initial state, the arc-shaped block 301d extends into the second vertical groove 301b and will not cause the cylinder 203c to enter the second vertical groove 301b upward. The left and right ends of the double-headed threaded rod 303a have opposite thread directions, so that when the double-headed threaded rod 303a rotates, the two moving plates 302a approach or move away from each other.

[0035] When in use, when the upper die 101 needs to be replaced and the upper die 101 is disassembled, only need to rotate the turntable 303d to make the transmission shaft 303c rotate and the double-headed threaded rod 303a rotate, so that the two moving plates 302a approach, thereby driving the transmission plate 302c to move, driving the connecting plate to move towards the double-headed threaded rod 303a direction, so that the two arc-shaped plates move towards the double-headed threaded rod 303a. At this time, the cylinder 203c can directly enter the second vertical groove 301b, and finally move to the arc-shaped groove 202c through the second vertical groove 301b, and then move to the outside of the bottom plate 103 through the second vertical groove 301b. At this time, the insertion pin 201b is disengaged from the slot 201a, and the disassembly of the upper die 101 is completed. There is a damping on the transmission shaft 303c, and the phenomenon of self-rotation will not occur.

[0036] In summary, by providing the disassembly component 300, when disassembling the upper mold 101, only need to rotate the turntable 303d to rotate the double-headed threaded rod 303a, which can drive the movement of the moving plate 302a, so that the four pairs of arc-shaped blocks 301d (two arc-shaped blocks 301d in one second vertical groove 301b are a pair) all disengage from the second vertical groove 301b, and the cylinder 203c disengages from the bottom plate 103 from the second vertical groove 301b, and the upper mold 101 can be directly disassembled.

[0037] Embodiment 3, referring to Figures 1 to 7 , is the third embodiment of the present invention. Different from the previous embodiment, this embodiment provides a warning component 400 for an automotive parts forming mold, which solves the problem of how to automatically give a warning after the cylinder 203c breaks. It includes an acoustic-optic component 401, which includes an alarm 401a fixedly connected to the bottom plate 103, and a strip of lights 401b fixedly connected to the side wall of the bottom plate 103. The trigger component 402 includes two pairs of first trigger pieces 402a fixedly connected in the inner groove 203a and the slot 201a, and a pair of second trigger pieces 402b that cooperate with the first trigger pieces 402a are fixedly connected to both the extension plate 203b and the bolt 201b.

[0038] Specifically, the alarm 401a and the strip of lights 401b here are double-layer triggered, that is, the second trigger piece 402b on the bolt 201b needs to cooperate with the first trigger piece 402a in the slot 201a, and the second trigger piece 402b on the extension plate 203b abuts against the first trigger piece 402a on the side wall of the inner groove 203a to activate the alarm 401a and light up the strip of lights 401b (the specific connection method is shown in detail in the drawings).

[0039] In use, when the cylinder 203c is within the transverse groove 202d, the second trigger piece 402b on the bolt 201b cooperates with the first trigger piece 402a within the slot 201a. The purpose of setting the second trigger piece 402b on the bolt 201b and the first trigger piece 402a within the slot 201a is to prevent the second trigger piece 402b on the extension plate 203b from abutting against the first trigger piece 402a on the side wall of the inner groove 203a when the bolt 201b just enters the slot 201a, thus preventing the emission of sound and light and avoiding misactivation. Since the transverse groove 202d is completely outside the first vertical groove 202b, the extension plate 203b cannot be fully reset. At this time, there is a gap between the second trigger piece 402b on the extension plate 203b and the first trigger piece 402a on the side wall of the inner groove 203a. During the use of the upper die 101, when the cylinder 203c breaks and separates from the extension plate 203b, under the action of the first spring 203d, the extension plate 203b resets. At this time, the second trigger piece 402b on the extension plate 203b abuts against the first trigger piece 402a on the side wall of the inner groove 203a, causing the alarm 401a to emit an alarm and the light bar 401b to light up, warning through sound and light to prevent loosening of one of the four corners from affecting the molding quality.

[0040] In summary, by setting the warning component 400, during the use of the upper die 101, when a break occurs between the cylinder 203c and the extension plate 203b, the second trigger piece 402b on the extension plate 203b can be made to abut against the first trigger piece 402a on the side wall of the inner groove 203a, causing the alarm 401a to emit an alarm and the light bar 401b to light up for warning, preventing loosening of one of the four corners from affecting the molding quality.

[0041] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention, and they should all be covered within the scope of the claims of the present invention.

Claims

1. An automobile parts forming mold, characterized in that: include, The mounting component (100) comprises an upper mold (101) and a lower mold (102), and a bottom plate (103) arranged on the upper mold (101) and the lower mold (102); The fixing component (200) comprises a latch assembly (201) arranged on the upper mold (101) and the lower mold (102), a guide assembly (202) arranged on the bottom plate (103), a locking assembly (203) arranged on the latch assembly (201), and a locking assembly (204) arranged on the guide assembly (202); A disassembly component (300) comprises a reset component (301) arranged on the guide component (202), a pushing component (302) arranged on the reset component (301), and a threaded component (303) arranged on the pushing component (302); The warning component (400) comprises an acousto-optic component (401) arranged on the bottom plate (103), and a trigger component (402) arranged on the latch component (201).

2. The automotive parts forming mold according to claim 1, characterized in that: The latch assembly (201) comprises four slots (201a) arranged on the bottom plate (103); latches (201b) matching the slots (201a) are provided on the upper mould (101) and the lower mould (102); and the slots (201a) and the latches (201b) are both square.

3. The automotive parts forming mold according to claim 2, characterized in that: The guide assembly (202) comprises an extension groove (202a) arranged on the slot (201a), a first vertical groove (202b) being arranged in the extension groove (202a), an arc groove (202c) being connected to the first vertical groove (202b), and a transverse groove (202d) being connected to the arc groove (202c).

4. The automotive parts forming mold according to claim 3, characterized in that: The engaging assembly (203) comprises an inner groove (203a) arranged on the latch pin (201b), an extension plate (203b) matching with the extension groove (202a) being slidably connected in the inner groove (203a), a cylinder (203c) matching with the first vertical groove (202b), the arc groove (202c) and the horizontal groove (202d) being fixedly connected to the extension plate (203b), and the extension plate (203b) is elastically connected to the inner wall of the inner groove (203a) via a first spring (203d).

5. The automotive parts forming mold according to claim 4, characterized in that: The locking assembly (204) comprises a mounting groove (204a) arranged on the extension groove (202a), an L-shaped plate (204b) being slidably connected in the mounting groove (204a), the L-shaped plate (204b) being elastically connected to the inner wall of the mounting groove (204a) via a second spring (204c), and an arc edge (204d) cooperating with the cylinder (203c) is provided on the L-shaped plate (204b).

6. The automotive parts forming mold according to claim 5, characterized in that: The reset assembly (301) comprises a receiving cavity (301a) arranged on the bottom plate (103); the transverse groove (202d) is provided with a second vertical groove (301b) penetrating the bottom plate (103); the second vertical groove (301b) is provided with two connecting grooves (301c) connected to the receiving cavity (301a); an arc block (301d) is slidably connected in the connecting groove (301c); and the two arc blocks (301d) are fixedly connected via a connecting block (301e).

7. The automotive parts forming mold according to claim 6, characterized in that: The pushing assembly (302) comprises two moving plates (302a) slidably connected in the installation cavity, and the two moving plates (302a) and the connecting block (301e) are both provided with installation openings (302b), a rotating shaft is fixedly connected in the installation opening (302b), a transmission plate (302c) is rotatably connected to the rotating shaft on the moving block, and the transmission plate (302c) is rotatably connected to the rotating shaft on the moving plate (302a).

8. The automotive parts forming mold according to claim 7, characterized in that: The threaded assembly (303) comprises a threaded opening arranged on the movable plate (302a), a double-headed threaded rod (303a) being threadedly connected to the threaded opening, the left and right ends of the double-headed threaded rod (303a) having opposite thread directions, the double-headed threaded rod (303a) being rotatably connected to the inner wall of the accommodating chamber (301a), the accommodating chamber (301a) being provided with a through opening (303b), a transmission shaft (303c) fixed to the double-headed threaded rod (303a) being rotatably connected to the through opening (303b), and a rotating disk (303d) being fixedly connected to the transmission shaft (303c).

9. The automotive parts forming mold according to claim 7 or 8, characterized in that: The sound and light assembly (401) comprises an alarm (401a) fixedly connected to the bottom plate (103), and a circle of light strips (401b) is fixedly connected to the side wall of the bottom plate (103).

10. The automotive parts forming mold according to claim 9, characterized in that: The trigger assembly (402) comprises two pairs of first trigger pieces (402a) fixedly connected in the inner groove (203a) and the slot (201a), and a pair of second trigger pieces (402b) cooperating with the first trigger pieces (402a) are fixedly connected to the extension plate (203b) and the latch (201b).

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