CN203875888U - Workpiece turn-over and transfer mechanism on stamping production line - Google Patents

Workpiece turn-over and transfer mechanism on stamping production line Download PDF

Info

Publication number
CN203875888U
CN203875888U CN201420167400.7U CN201420167400U CN203875888U CN 203875888 U CN203875888 U CN 203875888U CN 201420167400 U CN201420167400 U CN 201420167400U CN 203875888 U CN203875888 U CN 203875888U
Authority
CN
China
Prior art keywords
workpiece
handgrip
frame
carrying mechanism
stamping line
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
CN201420167400.7U
Other languages
Chinese (zh)
Inventor
周英富
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SHANGHAI YIPU AUTOMATION EQUIPMENT Co Ltd
Original Assignee
SHANGHAI YIPU AUTOMATION EQUIPMENT Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by SHANGHAI YIPU AUTOMATION EQUIPMENT Co Ltd filed Critical SHANGHAI YIPU AUTOMATION EQUIPMENT Co Ltd
Priority to CN201420167400.7U priority Critical patent/CN203875888U/en
Application granted granted Critical
Publication of CN203875888U publication Critical patent/CN203875888U/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Landscapes

  • Presses And Accessory Devices Thereof (AREA)

Abstract

The utility model provides a workpiece turn-over and transfer mechanism on a stamping production line. Sliding bases capable of moving left and right are arranged at the front end and the rear end of the top face of a rack respectively, lifting sliders are arranged on the sliding bases respectively, a left gripper stretching to the left and a right gripper stretching to the right are arranged on the lifting sliders respectively, a workpiece supporting frame is further arranged between the two sliding bases and on the rack, a placement platform is arranged at the top end of the workpiece supporting frame, a plurality of limiting bodies used for limiting the positions of workpieces are arranged on the placement platform, a turn-over gripper capable of performing turn-over is arranged at one end of the workpiece supporting frame, and workpieces on the workpiece supporting frame can be gripped by the turn-over gripper. According to the workpiece turn-over and transfer mechanism on the stamping production line, workpieces on the stamping production line can be transferred through the left gripper, the right gripper, the turn-over gripper and the workpiece supporting frame, and the production efficiency is high; moreover, the workpiece turn-over and transfer mechanism is simple and reliable in structure and convenient to operate, and operating safety of workers is effectively guaranteed.

Description

Workpiece turning carrying mechanism on a kind of stamping line
Technical field
The utility model relates to a kind of work piece carrying mechanism, relates in particular to the workpiece turning carrying mechanism on a kind of stamping line.
Background technology
Punching press is that depended on pressure machine and mould apply external force to sheet material, band, tubing and section bar etc., makes it to produce plastic deformation or separation, thereby obtains the forming and machining method of the workpiece (stamping parts) of required form and size.At present, in punching production process, the workpiece on stamping line is to place and take out by artificial, and workpiece is also first to pass through artificial unloading between adjacent forcing press, and then carrying and installation completes; Wherein workpiece is being carried out to positive and negative both direction while carrying out punching press, when workpiece handling, also need workpiece to overturn, this makes workman very inconvenient when operation, not only labor intensive, lose time, and production efficiency is very low, simultaneously in operating process, if operation of worker is inharmonious or accident (have a power failure, stop the supple of gas or steam etc.) occurs, be easy to cause security incident; In addition, this manually-operated method is only applicable to the small lot batch manufacture of miniature parts, the field that need to produce part for automobile etc. in enormous quantities, the daily output of part requires very high, obviously the workpiece that traditional stamping system is carried in punching course by artificial unloading can not meet Production requirement, therefore, how to enhance productivity, reduce workman's labour intensity, assurance workman's personal safety, be those skilled in the art's letter problem to be solved simultaneously.
Utility model content
The technical problems to be solved in the utility model is to provide a kind of working strength that reduces staff on stamping line, enhances productivity, and can realize the work piece carrying mechanism of workpiece upset when carrying simultaneously, to overcome the above-mentioned defect of prior art.
In order to solve the problems of the technologies described above, the utility model adopts following technical scheme: the workpiece turning carrying mechanism on a kind of stamping line, comprise frame, the rear and front end of described frame end face is respectively equipped with the slide that can move left and right, on described slide, be respectively equipped with lifting slider, on described lifting slider, be respectively equipped with the left handgrip stretching out and the right handgrip stretching out left to the right, described frame is also provided with a workpiece holder between two slides, described workpiece holder top is provided with mounting table, described mounting table is provided with a plurality of for limiting the limit body of the location of workpiece, one end of described workpiece holder is provided with turnover upset handgrip, workpiece on described upset handgrip energy grabbing workpiece bracing frame.
Preferably, described upset handgrip is connected with workpiece holder by rotating shaft, in described rotating shaft, is fixed with driven sprocket, and described workpiece holder is provided with drive sprocket, described drive sprocket is connected with the 4th motor, and described driven sprocket and drive sprocket are connected by chain.
Preferably, on described left handgrip, right handgrip and upset handgrip, be respectively equipped with a plurality of electromagnet.
Preferably, described frame is provided with the guide rail of left and right directions, and described slide matches with guide rail by guide bracket, described slide is provided with gear, described gear is connected with the first motor, and described frame is provided with tooth bar, and the gear on described slide matches with the tooth bar in frame.
Preferably, described frame is provided with the guide rail of left and right directions, described workpiece holder matches with guide rail by guide bracket, described workpiece holder is provided with gear, described gear is connected with the 3rd motor, described frame is provided with left and right directions tooth bar, and the gear on described workpiece holder and the tooth bar in frame match.
Preferably, described slide is provided with the leading screw on vertical direction, and described leading screw is connected with the second motor, and described lifting slider matches with leading screw, and leading screw rotates and drives lifting slider to move up and down.
Preferably, described left handgrip is connected with described lifting slider by the pole on a left and right directions respectively with right handgrip.
Further, be equipped with the fast contiguous block of inserting with through hole on described left handgrip and right handgrip, described pole is provided with limited impression, and the described fast contiguous block of inserting coordinates with limited impression and is bolted.
Preferably, described limit body comprises postive stop baffle and spacing bearing.
As mentioned above, the workpiece turning carrying mechanism on a kind of stamping line of the utility model, has following beneficial effect:
The utility model has been realized the workpiece handling on stamping line by left handgrip, right handgrip, upset handgrip and workpiece holder, in the handling process of workpiece, not only can facilitate the carrying of workpiece, can also overturn to workpiece, very convenient for need to carrying out tow sides and carry out the workpiece of punching press; It is manually of the prior art that the utility model is controlled replacement by mechanization, this has not only greatly reduced workman's labour intensity, has also greatly improved operating efficiency simultaneously, and of the present utility model simple in structure, reliable, easy to operate, effectively guaranteed the security of workman when operation.
Accompanying drawing explanation
Fig. 1 is structure chart of the present utility model.
Fig. 2 is front view of the present utility model.
Fig. 3 is side view of the present utility model.
Fig. 4 is top view of the present utility model.
Fig. 5 is the partial enlarged drawing at A place in Fig. 4.
In figure: 1 frame 11 tooth bars
12 tooth bar 2 slides
The left handgrip of 21 lifting slider 211
The fast contiguous block of inserting of 212 right handgrip 213
22 leading screw 23 gears
3 workpiece holder 31 mounting tables
32 limit body 321 postive stop baffles
322 spacing bearing 33 gears
4 pole 5 bolts
6 upset handgrip 71 driven sprockets
71 drive sprocket 73 chains
The specific embodiment
The structure that Figure of description illustrates, ratio, size etc., equal contents in order to coordinate description to disclose only, for person skilled in the art scholar, understand and read, not in order to limit the enforceable qualifications of the utility model, therefore the technical essential meaning of tool not, the adjustment of the modification of any structure, the change of proportionate relationship or size, do not affecting under the effect that the utility model can produce and the object that can reach, all should still drop in the scope that technology contents that the utility model discloses can contain.Simultaneously, in this description, quote as " on ", the term such as D score, 'fornt', 'back', " centre ", also only for ease of understanding of narrating, but not in order to limit the enforceable scope of the utility model, the change of its relativeness or adjustment, under without essence change technology contents, when being also considered as the enforceable category of the utility model.
Be the workpiece turning carrying mechanism on a kind of stamping line of the utility model as Figure 1-Figure 5, comprising frame 1, the rear and front end of described frame 1 end face is respectively equipped with the slide 2 that can move left and right, on described slide 2, be respectively equipped with lifting slider 21, on described lifting slider 21, be respectively equipped with the left handgrip 211 stretching out and the right handgrip 212 stretching out left to the right, on described left handgrip 211 and right handgrip 212, be equipped with a plurality of electromagnet.Described frame 1 is also provided with a workpiece holder 3 between two slides 2, described workpiece holder 3 tops are provided with mounting table 31, described mounting table 31 is provided with a plurality of for limiting the limit body 32 of the location of workpiece, and described limit body 32 comprises postive stop baffle 321 and spacing bearing 322.One end of described workpiece holder 3 is provided with turnover upset handgrip 6, and upset handgrip 6 is provided with a plurality of electromagnet, and described upset handgrip 6 is by the workpiece on upset energy grabbing workpiece bracing frame 3.As depicted in figs. 1 and 2, in the preferred embodiment of the present embodiment, described upset handgrip 6 is connected with the right-hand member of workpiece holder 3 by rotating shaft, in described rotating shaft, be fixed with driven sprocket 71, described workpiece holder 3 is provided with drive sprocket 72, described drive sprocket 72 is connected with the 4th motor, and described driven sprocket 71 and drive sprocket 72 are connected by chain 73; After the 4th electric motor starting, drive sprocket 72 drives driven sprocket 71 to rotate by chain 73, and driven sprocket 71 drives upset handgrip 6 to rotate.
In the present embodiment, described mounting table 31 is to removably connect with workpiece holder 3, selects the size of mounting table 31, and then be arranged on workpiece holder 3 when work according to the size of stamped workpieces.
In the present embodiment, described frame 1 is provided with the guide rail of left and right directions, and described slide 2 matches with guide rail by guide bracket; Described slide 2 is provided with gear 23, described gear 23 is connected with the first motor, and described frame 1 is provided with tooth bar 12, and the gear 23 on described slide 2 matches with the tooth bar 12 in frame 1, when the first electric motor starting, gear 23 rotates and drives slide 2 to move left and right along guide rail.
In the present embodiment, in order to facilitate the transmission of workpiece between left jaw 211 and right jaw 212, described workpiece holder 3 also can move left and right in frame 1, and its embodiment is: described frame 1 is provided with the guide rail of left and right directions, and described workpiece holder 3 matches with guide rail by guide bracket; Described workpiece holder 3 is provided with gear 33, described gear 33 is connected with the 3rd motor, described frame 1 is provided with the tooth bar 11 of left and right directions, gear 33 on workpiece holder 3 and the tooth bar 11 in frame 1 match, when the 3rd electric motor starting, gear 33 rotates and drives workpiece holder 3 to move left and right in frame 1, and the move distance that this has not only reduced left handgrip 211 and right handgrip 212, has also reduced overall dimensions.
In preferred embodiment of the present utility model, described slide 2 is provided with the leading screw 22 on vertical direction, and described leading screw 22 is connected with the second motor, and described lifting slider 21 matches with leading screw 22, and leading screw 22 rotates and drives lifting slider 21 to move up and down.
In the present embodiment, the stroke of left and right handgrip 211,212 can not affect grabbing workpiece when guaranteeing work, and described left handgrip 211 is connected with described lifting slider 21 by the pole 4 on a left and right directions respectively with right handgrip 212; And further, as shown in Figure 4 and Figure 5, be equipped with the fast contiguous block 213 of inserting with through hole on described left handgrip 211 and right handgrip 212, described pole 4 is provided with limited impression, it is fixing that described fast slotting contiguous block 213 and limited impression are joined merga pass bolt 5, and described bolt 5 closely cooperates with through hole.By this structure, be convenient to very much the installation of handgrip.
When the utility model is done carrying work between adjacent forcing press, and in the time of will realizing workpiece turning when carrying, its course of work and principle are: first will select suitable mounting table 31 to be arranged on workpiece holder 3 according to the size of processing work, and the position of adjusting postive stop baffle 321 on mounting table 31 and spacing bearing 322 is to adapt to the workpiece size after processing.After workpiece is processed by the forcing press of last operation, the utility model is started working, first allow the first motor drive slide 2 motions, slide 2 drives left handgrip 211 to stretch out from frame 1 left end, and the height of adjusting left handgrip 211 by leading screw 22, workpiece holder 3 moves to the high order end of frame 1 by the 3rd motor effect simultaneously.Electromagnet on left handgrip 211 move to workpiece directly over time, then by the second motor, drive leading screw 22 to transfer left handgrip 211 to allow electromagnet be adsorbed on workpiece; Then left handgrip 211 takes out workpiece and with workpiece retraction, during retraction, by leading screw 22, adjusts the height of left handgrip 211 so that coordinate with workpiece holder 3 from the die cavity of forcing press.When workpiece be positioned at mounting table 31 directly over and workpiece can coordinate with postive stop baffle 321 and spacing bearing 322 time, left handgrip 211 is transferred workpiece to mounting table 31 and is then unclamped, because the effect workpiece of postive stop baffle 321 and spacing bearing 322 can not be shifted.After workpiece is put well, the 4th electric motor starting being connected with drive sprocket 72, upset handgrip 6 is turned over to mounting table 31 and is adsorbed workpiece by electromagnet by the effect of chain 73 and driven sprocket 71; Then the 4th motor reversal, under the drive of upset handgrip 6, by 180 ° of workpiece turnings, the effect of workpiece holder 3 by the 3rd motor simultaneously stops after the right-hand member of frame 1 moves to correct position.Effect by slide 2 and lifting slider 21 by right handgrip 212 move to workpiece directly over then transfer, right handgrip 212 adsorbs workpiece by electromagnet, the electromagnet simultaneously overturning on handgrip 6 unclamps workpiece, right handgrip 212 is placed into workpiece on the forcing press Working position of subsequent processing by the effect of slide 2 and lifting slider 21 again, the electromagnet placing on workpiece rear right handgrip 212 unclamps workpiece, and then retraction is prepared lower task.
When doing carrying work between adjacent forcing press, the utility model do not need workpiece to overturn, so when carrying workpiece, after left handgrip 211 is placed into workpiece on mounting table 31, upset handgrip 6 keeps motionless, and right handgrip 212 directly takes out the workpiece on mounting table 31 be placed on the forcing press Working position of subsequent processing.
In sum, the workpiece turning carrying mechanism on a kind of stamping line of the utility model, can solve workpiece handling inconvenience problem on stamping line.So, thereby the utility model has effectively overcome practical problems more of the prior art, have very high value and use meaning.
Above-mentioned embodiment is illustrative principle of the present utility model and effect thereof only, but not for limiting the utility model.The utility model also has many aspects under the prerequisite without prejudice to overall thought, to improve, and for person skilled in the art scholar, all can, under spirit of the present utility model and category, can above-described embodiment be modified or be changed.Therefore, have in technical field under such as and conventionally know that the knowledgeable modifies or changes not departing from all equivalences that complete under spirit that the utility model discloses and technological thought, must be contained by claim of the present utility model.

Claims (9)

1. the workpiece turning carrying mechanism on a stamping line, it is characterized in that: comprise frame (1), the rear and front end of described frame (1) end face is respectively equipped with the slide (2) that can move left and right, on described slide (2), be respectively equipped with lifting slider (21), on described lifting slider (21), be respectively equipped with the left handgrip (211) stretching out and the right handgrip (212) stretching out left to the right, described frame (1) is also provided with a workpiece holder (3) between two slides (2), described workpiece holder (3) top is provided with mounting table (31), described mounting table (31) is provided with a plurality of for limiting the limit body (32) of the location of workpiece, one end of described workpiece holder (3) is provided with turnover upset handgrip (6), workpiece on described upset handgrip (6) energy grabbing workpiece bracing frame (3).
2. the workpiece turning carrying mechanism on a kind of stamping line according to claim 1, it is characterized in that: described upset handgrip (6) is connected with workpiece holder (3) by rotating shaft, in described rotating shaft, be fixed with driven sprocket (71), described workpiece holder (3) is provided with drive sprocket (72), described drive sprocket (72) is connected with the 4th motor, and described driven sprocket (71) and drive sprocket (72) are connected by chain (73).
3. the workpiece turning carrying mechanism on a kind of stamping line according to claim 2, is characterized in that: on described left handgrip (211), right handgrip (212) and upset handgrip (6), be respectively equipped with a plurality of electromagnet.
4. the workpiece turning carrying mechanism on a kind of stamping line according to claim 1, it is characterized in that: described frame (1) is provided with the guide rail of left and right directions, described slide (2) matches with guide rail by guide bracket, described slide (2) is provided with gear (23), described gear (23) is connected with the first motor, described frame (1) is provided with tooth bar (12), and the gear (23) on described slide (2) matches with the tooth bar (12) in frame (1).
5. the workpiece turning carrying mechanism on a kind of stamping line according to claim 1, it is characterized in that: described frame (1) is provided with the guide rail of left and right directions, described workpiece holder (3) matches with guide rail by guide bracket, described workpiece holder (3) is provided with gear (33), described gear (33) is connected with the first motor, described frame (1) is provided with left and right directions tooth bar (11), and the gear (33) on described workpiece holder (3) and the tooth bar (11) in frame (1) match.
6. the workpiece turning carrying mechanism on a kind of stamping line according to claim 1, it is characterized in that: described slide (2) is provided with the leading screw (22) on vertical direction, described leading screw (22) is connected with the second motor, described lifting slider (21) matches with leading screw (22), and leading screw (22) rotates and drives lifting slider (21) to move up and down.
7. the workpiece turning carrying mechanism on a kind of stamping line according to claim 1, is characterized in that: described left handgrip (211) is connected with described lifting slider (21) by the pole on a left and right directions (4) respectively with right handgrip (212).
8. the workpiece turning carrying mechanism on a kind of stamping line according to claim 7, it is characterized in that: on described left handgrip (211) and right handgrip (212), be equipped with the fast contiguous block (213) of inserting with through hole, described pole (4) is provided with limited impression, and described fast slotting contiguous block (213) is joined merga pass bolt (5) with limited impression and fixed.
9. the workpiece turning carrying mechanism on a kind of stamping line according to claim 1, is characterized in that: described limit body (32) comprises postive stop baffle (321) and spacing bearing (322).
CN201420167400.7U 2014-04-08 2014-04-08 Workpiece turn-over and transfer mechanism on stamping production line Expired - Fee Related CN203875888U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201420167400.7U CN203875888U (en) 2014-04-08 2014-04-08 Workpiece turn-over and transfer mechanism on stamping production line

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201420167400.7U CN203875888U (en) 2014-04-08 2014-04-08 Workpiece turn-over and transfer mechanism on stamping production line

Publications (1)

Publication Number Publication Date
CN203875888U true CN203875888U (en) 2014-10-15

Family

ID=51676431

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201420167400.7U Expired - Fee Related CN203875888U (en) 2014-04-08 2014-04-08 Workpiece turn-over and transfer mechanism on stamping production line

Country Status (1)

Country Link
CN (1) CN203875888U (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104649007A (en) * 2015-02-16 2015-05-27 吴中经济技术开发区越溪斯特拉机械厂 Adjustment mechanism of pneumatic mechanical moving device of mobile phone display screen
CN104959480A (en) * 2015-06-15 2015-10-07 湖州双力自动化科技装备有限公司 Logistic production line of fine punching machine
CN106625640A (en) * 2017-03-15 2017-05-10 苏州神运机器人有限公司 Robot grabbing hand capable of completing three-dimensional motion through one set of power source
CN108910531A (en) * 2018-08-31 2018-11-30 无锡和宏精密制造有限公司 A kind of workpiece gripper device
CN109573545A (en) * 2018-12-24 2019-04-05 芜湖卓越空调零部件有限公司 A kind of compressor of air conditioner upper cover automatic turning mechanism
CN109676077A (en) * 2018-12-30 2019-04-26 山东绿屏工业消防设备有限公司 For automating the turnover mechanism of stamping line
CN110788880A (en) * 2019-12-13 2020-02-14 苏州荣威工贸有限公司 Automatic robot that overturns of two tongs
CN111660006A (en) * 2020-06-30 2020-09-15 广西瑞克工业机器人有限公司 Shaft head workpiece gripping and clamping turnover device

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104649007A (en) * 2015-02-16 2015-05-27 吴中经济技术开发区越溪斯特拉机械厂 Adjustment mechanism of pneumatic mechanical moving device of mobile phone display screen
CN104959480A (en) * 2015-06-15 2015-10-07 湖州双力自动化科技装备有限公司 Logistic production line of fine punching machine
CN104959480B (en) * 2015-06-15 2017-06-16 湖州双力自动化科技装备有限公司 A kind of fine press logistic production line
CN106625640A (en) * 2017-03-15 2017-05-10 苏州神运机器人有限公司 Robot grabbing hand capable of completing three-dimensional motion through one set of power source
CN106625640B (en) * 2017-03-15 2023-11-17 苏州神运机器人有限公司 Robot gripper with three-dimensional motion completed by one group of power sources
CN108910531A (en) * 2018-08-31 2018-11-30 无锡和宏精密制造有限公司 A kind of workpiece gripper device
CN109573545A (en) * 2018-12-24 2019-04-05 芜湖卓越空调零部件有限公司 A kind of compressor of air conditioner upper cover automatic turning mechanism
CN109676077A (en) * 2018-12-30 2019-04-26 山东绿屏工业消防设备有限公司 For automating the turnover mechanism of stamping line
CN109676077B (en) * 2018-12-30 2023-09-12 山东绿屏工业消防设备有限公司 Turnover mechanism for automatic forging and pressing production line
CN110788880A (en) * 2019-12-13 2020-02-14 苏州荣威工贸有限公司 Automatic robot that overturns of two tongs
CN111660006A (en) * 2020-06-30 2020-09-15 广西瑞克工业机器人有限公司 Shaft head workpiece gripping and clamping turnover device

Similar Documents

Publication Publication Date Title
CN203875888U (en) Workpiece turn-over and transfer mechanism on stamping production line
CN204135219U (en) Automatic reversible table
CN204278014U (en) Punching press conveying robot
CN203726485U (en) Transferring manipulator
CN203527468U (en) Novel full-automatic computer numerical control lathe manipulator
CN102554062A (en) Automatic stamping production line
CN207308863U (en) A kind of forging apparatus
CN204711036U (en) A kind of automatic loading and unloading manipulator
CN203558235U (en) Ninety-degree turnover clamping and clasping machine for air energy water heater
CN102205378B (en) Automatic wafer feeding mechanism
CN202803997U (en) Automation feeding and blanking mechanical arm
CN203875887U (en) Workpiece transferring mechanism on stamping production line
CN204076256U (en) A kind of automatic stamping manipulator
CN216027818U (en) Full-automatic forging and processing device for high-strength gear blank
CN205364625U (en) Punch press work platform's circulation elevating gear
CN205085605U (en) Automatic change worm axle roll extrusion equipment
CN214417412U (en) Automobile part stamping device stable in clamping
CN104368996A (en) Machining platform transversely-moving device
CN202079191U (en) Multi-station feeding device for punch
CN204461561U (en) A kind of automatic Weighing recognition device
CN207103726U (en) Two axle both hands arms forge and press robot
CN204471493U (en) Platen high frequency die-cutting machine
CN208800705U (en) A kind of punching production mechanism with robot handling system
CN204195751U (en) A kind of free-standing line manipulator
CN206253507U (en) The equipment that a kind of manipulator transmits energy progressive press tool processing automatically

Legal Events

Date Code Title Description
C14 Grant of patent or utility model
GR01 Patent grant
CF01 Termination of patent right due to non-payment of annual fee
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20141015

Termination date: 20160408