CN115449617A

CN115449617A - Piston heat treatment process

Info

Publication number: CN115449617A
Application number: CN202211207032.XA
Authority: CN
Inventors: 卞玉森; 邱晓晨; 李敏杰; 余穗
Original assignee: SHANGHAI JIAOYUN AUTOMOBILE FINE BLANKING CO Ltd
Current assignee: SHANGHAI JIAOYUN AUTOMOBILE FINE BLANKING CO Ltd
Priority date: 2022-09-30
Filing date: 2022-09-30
Publication date: 2022-12-09
Anticipated expiration: 2042-09-30
Also published as: CN115449617B

Abstract

The application relates to the field of piston manufacturing, in particular to a piston heat treatment process, which comprises the steps of putting each layer of material frame in a tray corresponding to a piston, and moving the tray with the piston placed in front of cleaning equipment through a trolley; moving the chassis and all the material frames into a cleaning device, driving each layer of material frames to move upwards by the cleaning device so that the cleaning device can directly wash the piston of each layer of material frames, and cleaning with alkaline water, then cleaning with clear water and then drying; the dried piston is moved out of the cleaning equipment and then is sent into a quenching furnace for quenching through a trolley; the quenched piston is sent into cleaning equipment to be cleaned again; the piston after being cleaned again is sent into a tempering furnace for tempering; and naturally cooling the tempered piston, and performing shot blasting treatment on the cooled piston, so that all pistons can be more fully cleaned.

Description

Piston heat treatment process

Technical Field

The application relates to the field of piston manufacturing, in particular to a piston heat treatment process.

Background

Automotive pistons are an important part in automotive engines, and are generally manufactured from silicon-aluminum alloys through gravity casting, heat treatment, fine machining and final surface treatment. Among them, heat treatment is very important in determining the overall strength and hardness of the piston.

The prior piston needs to be cleaned to remove oil stains on the surface of the piston before being placed into a quenching furnace for heating, so that the piston can be better carburized during quenching. And present piston can be placed on the tray, refer to fig. 6, and the tray includes that two are horizontally chassis 1, and two chassis 1 are close vertical side welding, and every chassis 1 is located all around and is vertical stand 11 with the equal fixedly connected with of center department, and all stand 11 of every chassis 1 have all been pegged graft and have been expected frame 12, and material frame 12 stacks several layers along vertical direction, all can place the several piston in every layer material frame 12.

In view of the above-mentioned related technologies, when the stacked material frames 12 are put into a cleaning device for cleaning, the pistons at the middle position and the bottom position are cleaned by the cleaning liquid dropped from the upper material frame 12, and are difficult to be directly washed by the cleaning liquid, so that part of the pistons are insufficiently cleaned before quenching, and the quenching quality of part of the pistons is affected.

Disclosure of Invention

In order to prevent the quenching quality of the whole piston from being greatly influenced, the application provides a heat treatment process for the piston.

The piston heat treatment process provided by the application adopts the following technical scheme.

A piston heat treatment process specifically comprises the following steps.

Step 1, putting each layer of material frame in a tray corresponding to a piston, and moving the tray with the piston in place to the front of cleaning equipment through a trolley;

step 2, moving the chassis and all the material frames into a cleaning device, driving each layer of material frame to move upwards by the cleaning device so that the cleaning device can directly wash the piston of each layer of material frame, and cleaning with alkaline water, then cleaning with clear water and then drying;

step 3, the dried piston is moved out of the cleaning equipment and then is sent into a quenching furnace through a trolley for quenching;

step 4, conveying the quenched piston into cleaning equipment for cleaning again;

step 5, feeding the piston cleaned again into a tempering furnace for tempering;

and 6, naturally cooling the tempered piston, and performing shot blasting treatment on the cooled piston.

By adopting the technical scheme, when the piston placed in the material frame is cleaned, the stacked material frames can be vertically shifted to be away from one interval, so that an enough interval exists between two adjacent material frames, and an interval exists between the bottom of the material frame with the lowest position and the bottom surface inside the cleaning equipment, so that the piston in each layer of material frame can be sufficiently cleaned, the piston can be fully and uniformly carburized when the piston of each layer of material frame is subsequently quenched, and the quenching quality of the piston is not easily influenced.

Optionally, the cleaning device includes a case, a plurality of support rods arranged in the case and capable of moving to the lower surface of each layer of material frame, a support rod oil cylinder arranged in the case and driving each support rod to move, a spray head rod arranged on the support rods and used for washing pistons in adjacent material frames, a case spray head arranged on the inner wall of the top of the case and used for washing the highest material frame, and a drying pipe arranged in the case and used for sending hot air to the upper surface and the lower surface of the material frame.

Through adopting above-mentioned technical scheme, the chassis enters into quick-witted incasement together with the material frame that stacks for each die-pin can remove to each material frame lower surface department, then the die-pin hydro-cylinder drives each layer of material frame and shifts up, so that the shower nozzle pole washes two adjacent material frames, and quick-witted case shower nozzle also can wash the highest material frame upper surface simultaneously, and after the alkali wash and clear water wash, the stoving pipe sends out hot-blast so that the piston is dried to the material frame.

Optionally, each support rod is provided with a stand column port for a stand column located at the center of the chassis to enter, and a group of spray head rods are arranged on two sides of each support rod.

Through adopting above-mentioned technical scheme, the stand mouth can play certain positioning action corresponding to the stand to the setting of two sets of shower nozzle poles on every die-pin makes the material frame surface can obtain comparatively abundant washing.

Optionally, the nozzle rod is rotatably connected to the support rod, worm wheels are fixedly connected to the rotating points of the nozzle rod coaxially, a row of worms with a plurality of numbers are meshed with the worm wheels corresponding to each group of nozzle rods in a one-to-one correspondence manner, the worms are rotatably connected to the support rod and are fixedly connected to the same row of worms coaxially, two rows of worms of the same support rod are fixedly connected to synchronizing gears coaxially, two synchronizing gears in the same support rod are meshed with motor gears, and a nozzle rod motor for driving the motor gears to rotate is arranged in the support rod.

Through adopting above-mentioned technical scheme, shower nozzle pole motor drives motor gear and rotates, make two synchronous gear rotate, make two rows of worms rotate in step, make each worm wheel rotate in step, make the shower nozzle pole rotate in step, carry out abundant washing with the piston of placing everywhere in the material frame, when the layer board inserts every layer of material frame below at first simultaneously, the shower nozzle pole can rotate to the position department that is close to as far as in the die-pin, make the shower nozzle pole can not contradict in the stand.

Optionally, each of the support rods is fixedly connected with an oil cylinder plate, the bottom surface of each oil cylinder plate is connected with a power rod of a corresponding support rod oil cylinder, and the cylinder body of each support rod oil cylinder is connected to the chassis.

Through adopting above-mentioned technical scheme for can compare between each die-pin and be close to, in order to adapt to the adjacent two-layer material frame less interval between when stacking.

Optionally, every the drying duct air outlet inner wall all rotates and is connected with a set of diversion board, and diversion board axis of rotation is the level so that the drying duct can send out hot-blastly towards two adjacent material frames, and the quick-witted case is equipped with and makes every diversion board of group carry out synchronous pivoted diversion motor.

Through adopting above-mentioned technical scheme, the diversion board rotates and makes every hot-blast direction that drying tube sent out can be towards top or below to make every drying tube directly send out hot-blast drying to the close side of two material frames that correspond, and when drying tube sent out hot-blast towards material frame upper surface or lower surface, the slow change of wind direction can carry out comparatively abundant stoving everywhere to material frame upper surface or lower surface.

Optionally, the drying pipe all sets up a set ofly at two relative inner walls of quick-witted case, and the drying pipe is close to in the length direction one side of material frame.

Through adopting above-mentioned technical scheme, the hot-blast every layer of material frame that makes that the equidirectional blows can receive comparatively abundant stoving, compare in a set of drying tube be difficult for appearing the material frame and keep away from the one side of drying tube the condition of being difficult to by the stoving, also make the material frame not only receive the hot-blast stoving that comes with one side to send yet, the drying tube is towards material frame length direction one side simultaneously, make the hot-blast width direction along the material frame that the drying tube sent see off, make hot-blast when reacing material frame center department, the velocity of flow is difficult for reducing too much, promote drying efficiency.

Optionally, every the coaxial fixedly connected with diversion board worm wheel of diversion board axis of rotation department, every diversion board worm wheel all meshes to have the diversion board worm that rotates to connect in quick-witted case, and the coaxial fixed connection of one row of diversion board worm on the same vertical side sets up one row of diversion board worm between two diversion board worm wheels, and the equal coaxial fixedly connected with belt pulley of two rows of diversion board worms, the coaxial fixedly connected with axle band pulley of diversion motor output shaft, and the transmission is connected with the drive belt between axle band pulley and two belt pulleys.

By adopting the technical scheme, the diversion motor drives the transmission belt, the two rows of worms rotate in the same direction, each worm wheel rotates in the same direction, the diversion plate in the drying pipe at one inner wall of the case rotates upwards, the diversion plate in the drying pipe at the other inner wall of the case rotates downwards, when the drying pipe at one inner wall of the case sends hot air to the bottom surface of the material frame, the drying pipe at the other inner wall of the case sends hot air to the top surface of the material frame, the drying pipes at the two inner walls of the case can not send hot air to the upper surface or the lower surface of the material frame at the same time, the upper surface and the lower surface of the material frame can be dried by hot air at the same time, the hot air sent by the drying pipes at the two opposite inner walls of the case is not easy to offset, and the upper surface and the lower surface of the material frame can be sufficiently dried by hot air.

Optionally, the drying pipe is inclined, one end of the lowest point of the drying pipe sends out hot air, one end of the highest point of the drying pipe is communicated with an arc-shaped pipe, and the bending section of the arc-shaped pipe is the highest point of the arc-shaped pipe.

By adopting the technical scheme, the cleaning liquid carelessly entering the drying pipe is difficult to flow away through the arc-shaped pipe during cleaning, so that when the drying pipe sends out hot air, some cleaning liquid remained in the drying pipe can be brought out, and the possibility of cleaning liquid remaining in the drying pipe is reduced.

Optionally, the fixed wall sliding connection in the case is provided with a plurality of abutting columns which can coaxially abut against the top end of each upright column, the diameters of the abutting columns are consistent with those of the upright columns, the case is connected with a general plate which is connected with all the abutting columns in a sliding manner, and the case is provided with a general plate oil cylinder which drives the general plate to vertically move.

By adopting the technical scheme, the abutting columns can be sleeved in the process of moving the plurality of layers of material frames with higher height upwards, so that the material frames can be kept stable in the process of moving upwards, and meanwhile, the stand columns can be stably sleeved when the material frames move downwards after the cleaning is finished.

In summary, the present application includes at least one of the following advantages:

1. an enough space exists between two adjacent material frames, and a space exists between the bottom of the material frame with the lowest position and the bottom surface inside the cleaning equipment, so that the piston in each layer of material frame can be sufficiently cleaned, the piston can be sufficiently and uniformly carburized when the piston of each layer of material frame is subsequently quenched, and the quenching quality of the piston is not easily influenced;

2. the hot-blast every layer of material frame that makes the equidirectional blowing can receive comparatively abundant stoving, compares in a set of stoving pipe and is difficult for appearing the material frame and keeps away from the condition that one side of drying pipe is difficult to be dried, also makes the material frame not only receive the stoving that comes from sending with one side.

Drawings

FIG. 1 is a schematic view of the configuration of the inlet end of the housing feed block of the cleaning apparatus of the present application;

FIG. 2 is a schematic view of the structure of the case at an end away from the feeding frame;

FIG. 3 is a partial cross-sectional view of the upper surface of a bar to show the internal structure of the bar;

FIG. 4 is a partial cross-sectional view of the feeding frame of the chassis entering the end face of one end to show the structural schematic of the direction change plate worm gear and direction change plate worm;

FIG. 5 is an enlarged view at A in FIG. 4;

fig. 6 is a schematic view of a structure of a tray in the background art.

Description of the reference numerals: 1. a chassis; 11. a column; 12. material frame; 2. a chassis; 31. a master board; 32. a main plate oil cylinder; 33. a case nozzle; 4. a supporting rod; 41. a direction-changing plate; 42. a direction-changing motor; 43. a direction-changing plate worm gear; 44. a direction-changing plate worm; 45. a pulley; 46. a shaft pulley; 47. a transmission belt; 48. an arc-shaped tube; 49. a butting post; 5. a support rod oil cylinder; 51. a nozzle rod; 52. a drying duct; 53. a column port; 54. a worm gear; 55. a worm; 56. a synchronizing gear; 57. a motor gear; 58. a spray head rod motor; 59. and a cylinder plate.

Detailed Description

The present application is described in further detail below with reference to the attached drawings.

The embodiment of the application discloses a piston heat treatment process, which specifically comprises the following steps.

Step 1, putting a piston into each layer of material frame 12 in a corresponding tray, and moving the tray with the piston in front of cleaning equipment through a trolley;

step 2, moving the chassis 1 and all the material frames 12 into a cleaning device, driving each layer of material frame 12 to move upwards by the cleaning device so that the cleaning device can directly wash the piston of each layer of material frame 12, and cleaning with alkaline water, then cleaning with clear water and then drying;

and 6, naturally cooling the tempered piston, and performing shot blasting on the cooled piston.

Referring to fig. 1, the cleaning equipment includes a chassis 2 placed on the ground, two drag hooks (not shown in the figure) which can be hooked on one end of the chassis 1 in the length direction can be installed in the chassis 2 so that the chassis 1 is driven to be pulled into the chassis 2, the inner walls of the two vertical directions of the chassis 2 are respectively provided with a corresponding chain and a corresponding chain wheel, and are matched with a corresponding motor so that the drag hooks can move (not shown in the figure), and one end of the chassis 1 in the length direction enters the chassis 2 in the length direction of the chassis 2. Two rows of steel rollers (not shown) are rotatably disposed at the bottom of the chassis 2 for the chassis 1 to smoothly move into the chassis 2.

Referring to fig. 1 and fig. 2, this embodiment is convenient for show, set the material frame 12 that stacks on the chassis 1 as the three-layer, the one end inner wall department that supplies the chassis 1 to get into is kept away from to the machine case 2 has three die-pins 4 along vertical direction sliding connection, die-pin 4 length direction is unanimous with machine case 2 length direction, die-pin 4 has seted up stand mouth 53 towards machine case 2 one end department that supplies the chassis 1 to move the entering, stand mouth 53 runs through in die-pin 4 upper surface and lower surface, in the in-process that material frame 12 moved and gets into machine case 2, die-pin 4 corresponds the lower surface department that gets into each layer of material frame 12, and the stand 11 that is located chassis 1 central point department along die-pin 4 length direction sliding connection in stand mouth 53 inner wall. 2 upper surfaces of machine case have several butt post 49 along vertical direction sliding connection, 49 external diameters of butt post are unanimous with 11 external diameters of stand, the total board 31 of the equal fixedly connected with in 49 upper ends of whole butt post, total board 31 is along vertical direction sliding connection in 2 upper portions of machine case inner wall, 2 upper portion of machine case outer wall fixedly connected with total board hydro-cylinder 32, total board hydro-cylinder 32 power rod bottom end fixed connection is in total board 31 upper surface, make 49 bottom surfaces of butt post can coaxial butt in 11 up end of stand.

Referring to fig. 1 and 2, each of the support rods 4 is exposed at one end of the machine case 2 in the length direction, each of the support rods 4 is fixedly connected with an oil cylinder plate 59 exposed in the machine case 2, the outer wall of the machine case 2 is fixedly connected with three groups of two support rod oil cylinders 5, and the power rods of the three groups of support rod oil cylinders 5 are fixedly connected to the lower surfaces of the three oil cylinder plates 59 in a one-to-one correspondence manner, so that the three support rods 4 can be lifted, the corresponding three material frames 12 can be lifted, and the distance between the two adjacent material frames 12 is kept the same. Every 4 length direction's of die-pin vertical side all rotates and is connected with a set of shower nozzle pole 51, shower nozzle pole 51 axis of rotation is vertical, every group shower nozzle pole 51 sets up two, shower nozzle pole 51 is inside to inlay and to establish several high pressure nozzle and communicate in outside high pressure water pump, make every shower nozzle pole 51 rotate the in-process and wash to corresponding material frame 12 half region, shower nozzle pole 51 that highly the minimum only upwards spouts the washing liquid or clear water and remaining shower nozzle pole 51 simultaneously up and spout the washing liquid or clear water down. Meanwhile, a plurality of case nozzles 33 are uniformly and fixedly connected to the top surface inside the case 2, and the case nozzles 33 are communicated with an external high-pressure water pump, so that the case nozzles 33 spray cleaning liquid or clean water toward the upper surface of the material frame 12 with the highest height.

Referring to fig. 3, the position of each support rod 4 where the nozzle rod 51 is disposed is protruded outward, so that the nozzle rod 51 can be attached to the vertical side surface of the support rod 4 in the length direction during the rotation process, so that the upright post 11 is not easy to abut against the nozzle rod 51 during the process of moving the material frame 12 into the chassis 2, and meanwhile, the nozzle rod 51 can completely cover a half area of the corresponding material frame 12. Every sprinkler head pole 51 rotation point department all coaxial fixedly connected with worm wheel 54, every worm wheel 54 all meshes and rotates the worm 55 of connecting in die-pin 4 inside, coaxial fixedly connected between one row of worm 55 on same die-pin 4 length direction, all there are two rows of worms 55 in every die-pin 4, every row of worm 55 tip all coaxial fixedly connected with synchronizing gear 56, fixedly connected with sprinkler head pole motor 58 in the die-pin 4, the coaxial fixedly connected with motor gear 57 of sprinkler head pole motor 58 output shaft, motor gear 57 meshes two close synchronizing gear 56 for two sets of sprinkler head poles 51 that a die-pin 4 corresponds can carry out synchronous rotation.

Referring to fig. 1, a group of arc-shaped pipes 48 is fixedly connected to the vertical outer walls of the two length directions of the case 2, four arc-shaped pipes 48 are arranged in the vertical direction, the bending sections of the arc-shaped pipes 48 are the highest points of the arc-shaped pipes 48, the bottom end opening of the arc-shaped pipe 48, which is far away from the case 2, is communicated with a hot air outlet of an external air heater, the bottom opening of each arc-shaped pipe 48, which is close to the case 2, is fixedly connected and communicated with a slightly inclined drying pipe 52, and the opening of one end of the drying pipe 52, which is far away from the arc-shaped pipe 48, is the lowest point of the drying pipe 52 and is located in the case 2.

Referring to fig. 4 and 5, the inner walls of the two drying pipes 52 facing the inner side of the cabinet 2 are rotatably connected with a set of direction-changing plates 41, two direction-changing plates 41 can be arranged in the same vertical direction, the direction of the rotation axis of each direction-changing plate 41 is consistent with the length direction of the cabinet 2, the rotation point of each direction-changing plate 41 is coaxially and fixedly connected with a direction-changing plate worm wheel 43, the direction-changing plate worm wheels 43 are located in the cabinet 2, each direction-changing plate worm wheel 43 is engaged with a direction-changing plate worm 44 rotatably connected to the inner wall of the cabinet 2, one row of direction-changing plate worms 44 are coaxially and fixedly connected in the same vertical direction, two rows of direction-changing plate worms 44 are arranged in the cabinet 2, the upper ends of the rows of direction-changing plate worms 44 are coaxially and fixedly connected with belt pulleys 45, the belt pulleys 45 are exposed out of the outer wall of the upper portion of the cabinet 2, the direction-changing motor 42 is coaxially and fixedly connected with a shaft pulley 46 through the output shaft pulley 46, the connection lines of the centers of the three belt pulleys form a triangle, and a transmission belt 47 is connected between the shaft pulley 46 and the two belt pulleys 45.

The projection of each material frame 12 on the vertical side surface of the length direction of the chassis 2 is located between the projections of the two adjacent drying pipes 52 on the vertical side surface of the length direction of the chassis 2 corresponding to the same vertical direction, each turning plate 41 rotates to enable hot air sent out by the drying pipes 52 to be sent out to the lower surface of the corresponding material frame 12 with a high height or the upper surface of the material frame 12 with a low height, in the rotating process of the turning plate 41, the surface of the material frame 12 can be dried by the hot air more fully and directly, meanwhile, because two rows of drying pipes 52 exist in the vertical direction, the hot air is not only sent to the surface of the material frame 12 from one side of the material frame 12, and the vertical inner wall of each opening for placing a piston of the material frame 12 can be dried better.

Meanwhile, two rows of the turning plate worm wheels 43 in the same vertical direction exist, only one row of the turning plate worm 44 exists between the two rows of the turning plate worm wheels 43, the two rows of the turning plate worm wheels 43 can rotate in the same direction, and then the two rows of the turning plates 41 in different vertical directions move in the opposite directions, so that one row of the drying pipes 52 can send hot air towards the lower surface of the material frame 12 when the other row of the drying pipes 52 send hot air towards the upper surface of the material frame 12, and the upper surface and the lower surface of all the material frames 12 can be dried by hot air all the time.

The application principle of the heat treatment process of the piston in the embodiment of the application is as follows: chassis 1 is driven by the drag hook in quick-witted case 2 and is entered into quick-witted case 2 in, then total board hydro-cylinder 32 makes butt post 49 move down and coaxial butt in stand 11 upper end, then the extension of die-pin hydro-cylinder 5 power pole, make each die-pin 4 move up, so that each material frame 12 can shift up, make the interval between two adjacent material frames 12 expand, then shower nozzle pole motor 58 makes shower nozzle pole 51 rotate in the horizontal plane, with to corresponding material frame 12 upper surface or lower surface blowout buck or clear water, quick-witted case shower nozzle 33 also spouts buck or clear water to the material frame 12 upper surface of high height simultaneously.

After the cleaning is completed, the drying pipes 52 send out hot air to the surface of the material frame 12, and the turning motor 42 enables the turning plate 41 to rotate, so that the direction of the hot air sent out by the drying pipes 52 is changed within a certain range on a vertical surface, and the two rows of drying pipes 52 can fully dry the upper surface and the lower surface of each material frame 12. After the drying is finished, the supporting rod 4 is reset, then the abutting column 49 is reset, and finally the drag hook in the chassis 2 sends the chassis 1 out of the chassis 2 for subsequent quenching related steps.

The above are preferred embodiments of the present application, and the scope of protection of the present application is not limited thereto, so: equivalent changes in structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. A piston heat treatment process is characterized in that: the method specifically comprises the following steps:

step 1, putting a piston into each layer of material frame (12) in a corresponding tray, and moving the tray with the piston in place to the front of cleaning equipment through a trolley;

step 2, moving the chassis (1) and all the material frames (12) into a cleaning device, driving each layer of material frame (12) to move upwards by the cleaning device so that the cleaning device can directly wash the piston of each layer of material frame (12), and cleaning with alkaline water, then cleaning with clear water and then drying;

2. A piston heat treatment process according to claim 1, characterized in that: cleaning equipment includes quick-witted case (2), locate in quick-witted case (2) and can remove several die-pin (4) to each layer of material frame (12) lower surface department, locate quick-witted case (2) and drive die-pin hydro-cylinder (5) that each die-pin (4) removed, locate die-pin (4) and carry out shower nozzle pole (51) that wash to the piston in adjacent material frame (12), locate quick-witted case (2) top inner wall and carry out quick-witted case shower nozzle (33) that wash to the highest material frame, locate quick-witted case (2) and see out hot-blast drying pipe (52) to material frame (12) upper surface and lower surface.

3. A piston heat treatment process according to claim 2, wherein: every die-pin (4) all set up the stand mouth (53) that supplies stand (11) that are located chassis (1) center department to get into, every die-pin (4) both sides all set up a set of shower nozzle pole (51).

4. A piston heat treatment process according to claim 3, wherein: spray head pole (51) are rotated and are connected in die-pin (4), the coaxial fixedly connected with worm wheel (54) of the rotation point department of spray head pole (51), worm wheel (54) one-to-one meshing that every group spray head pole (51) correspond has worm (55) of one row of several, worm (55) are rotated and are connected in die-pin (4), the coaxial fixed connection of same row worm (55), equal coaxial fixedly connected with synchronizing gear (56) in two rows worm (55) of same die-pin (4), two synchronizing gear (56) meshing in same die-pin (4) have motor gear (57), be equipped with in die-pin (4) and drive motor gear (57) pivoted spray head pole motor (58).

5. A process for heat treating a piston as claimed in claim 2, wherein: each support rod (4) is fixedly connected with an oil cylinder plate (59), the bottom surface of each oil cylinder plate (59) is connected with a power rod of a corresponding support rod oil cylinder (5), and the cylinder body of each support rod oil cylinder (5) is connected to the case (2).

6. A process for heat treating a piston as claimed in claim 2, wherein: every drying tube (52) air outlet inner wall all rotates and is connected with a set of deflector (41), and deflector (41) axis of rotation is the level so that drying tube (52) can send out hot-blastly towards two adjacent material frames (12), and quick-witted case (2) are equipped with and make every group deflector (41) carry out synchronous pivoted diversion motor (42).

7. A piston heat treatment process according to claim 6, wherein: drying tube (52) all set up a set of in two relative inner walls of quick-witted case (2), drying tube (52) are close to in the length direction one side of material frame (12).

8. A piston heat treatment process according to claim 7, wherein: every deflector (41) axis of rotation department coaxial fixedly connected with deflector worm wheel (43), every deflector worm wheel (43) all meshes and rotates deflector worm (44) of connecting in quick-witted case (2), the coaxial fixed connection of one row of deflector worm (44) on the same vertical direction, set up one row of deflector worm (44) between two deflector worm wheels (43), the equal coaxial fixedly connected with belt pulley (45) of two rows of deflector worm (44), the coaxial fixedly connected with axle pulley (46) of diversion motor (42) output shaft, the transmission is connected with drive belt (47) between axle pulley (46) and two belt pulleys (45).

9. A process for heat treating a piston as claimed in claim 2, wherein: the drying pipe (52) is inclined, hot air is sent out from one end of the lowest point of the drying pipe (52), the end of the highest point of the drying pipe (52) is communicated with the arc-shaped pipe (48), and the bending section of the arc-shaped pipe (48) is the highest point of the arc-shaped pipe (48).

10. A process for heat treating a piston as claimed in claim 2, wherein: the fixed wall sliding connection in the machine case (2) is provided with a plurality of abutting columns (49) which can be coaxially abutted to the top end of each upright column (11), the diameters of the abutting columns (49) are consistent with those of the upright columns (11), the machine case (2) is connected with a general plate (31) connected to all the abutting columns (49) in a sliding manner, and the machine case (2) is provided with a general plate oil cylinder (32) which drives the general plate (31) to move vertically.