CN114393109B - Fine punching manufacturing process for thickened rear brake steel backing - Google Patents

Abstract

The invention relates to a manufacturing process, in particular to a rear brake steel backing fine blanking manufacturing process with thickening. The method comprises the following steps: warehousing raw materials → storing raw materials → fine blanking → deburring → vibration grinding → shot blasting → electroplating → full inspection of appearance → packaging and warehousing. So as to realize the control and operation of mass production of thickened products.

Description

Fine punching manufacturing process for thickened rear brake steel backing

Technical Field

The invention relates to a manufacturing process, in particular to a fine punching manufacturing process of a rear brake steel backing with thickening.

Background

The precision of the product prepared by the existing manufacturing process is not particularly high, so that the service performance of the product is influenced to a certain extent.

The thickened back plate is a brake back plate with a new structure in the market at present for realizing light weight of an automobile, and aims to reduce the weight of the brake back plate and increase the strength of a key part so as to achieve higher strength than the back plate with the same thickness.

Disclosure of Invention

The invention mainly solves the defects in the prior art, and provides a fine punching manufacturing process of a thickened rear brake steel backing, which improves the production efficiency and product stability of thickened products and simplifies the process of thickened back plates.

The technical problem of the invention is mainly solved by the following technical scheme:

a rear brake steel backing fine blanking manufacturing process with thickening comprises the following steps:

(I) a process flow:

the product is mainly processed by the following process flows: storing OP10 raw materials in a warehouse; storing OP20 raw material; OP30 fine blanking; removing burrs by OP 40; OP50 vibration grinding; OP60 shot blasting; OP70 electroplating; OP80 appearance complete detection; OP90 packaging and warehousing for 9 process links;

(II) process description:

1) Warehousing raw materials:

raw material trade mark: s275JR, the thickness of the material is 6.0mm +/-0.15, and the material meets the Q/BQB303-2018 Bao steel standard raw material;

the width of each coil of material is measured by a caliper, and the requirement of 124min needs to be met;

extracting 1 roll of raw materials in each batch, and cutting plates with areas of 300mm and 300mm, wherein 2 material test rods are manufactured, one test rod is used for an experiment, and the other test rod is reserved in a quality department; clamping a material test bar on a chuck of UTM equipment, performing a physical property test of the raw material, and recording the yield strength and the tensile strength of the raw material; the upper yield strength needs to satisfy: not less than 275MPa; the tensile strength needs to meet the following requirements: 430MPa to 580MPa;

2 50mm square test blocks are manufactured, one test block is used for an experiment, and the other test block is reserved; the test block is placed on a spectrometer test table board, chemical element analysis tests of raw materials are carried out, and the content of each chemical element of the raw materials is recorded, and the requirements are met: c% is less than or equal to 0.18; si% is less than or equal to 0.35; mn% is less than or equal to 1.50; p% is less than or equal to 0.025; s% is less than or equal to 0.020; n% is less than or equal to 0.012; ceq% is less than or equal to 0.40;

2) Raw material storage:

the storage environment requirement of the raw material steel coil is as follows: drying, ventilating and avoiding damp, the situations of water leakage and water accumulation can not occur, if the hidden danger exists, the raw materials are immediately transferred, and the hidden danger is eliminated in time; the raw materials are required to be stored in a special storage position, the special storage position is made of an I-shaped steel structure, and a sleeper is used at a part in contact with the materials, so that the problems of indentation, pits and scratch appearance on the surfaces of the materials caused by collision are solved; (ii) a

The storage requirement of the raw material steel coil is as follows: the steel coils are vertically stacked and cannot be obliquely placed or inversely placed; after the certificate is stored, the certificate is required to be marked and attached;

3) Fine blanking:

through oil pressure formula 650T fine blanking equipment, the relevant parameter of equipment should satisfy following requirement:

(1) The main pressure is 4500-5000 Kn;

(2) The edge pressing force is 1500-2000 Kn;

(3) The counter pressure is 300-500 Kn;

(4) Foreign matter monitoring pressure is 14-15 Mpa;

(5) Monitoring an emergency stop stroke by foreign matters for 2mm; (ii) a

The precision requirement of the fine blanking equipment should meet:

(1) The repeated precision of the slide block can reach 0.02;

(2) The flatness of the upper table surface and the lower table surface of the mounting surface is 0.02;

(3) The parallelism of the upper table surface and the lower table surface of the mounting surface is 0.02;

the fine blanking die is completed in a progressive die mode, and the processes in the die mainly comprise the following steps:

(1) Forming a bevel edge; (2) pre-flushing; (3) thickening and forming; (4) punching positioning holes; (5) bump forming; (6) blanking; 6 steps are finished; (ii) a

The main structure of the fine blanking die consists of an upper die 8 template and a lower die 8 template and a thickening mechanism:

(1) An upper die base: pre-hard die steel P20 is adopted for processing, the size of a die holder is 700X700X95, the flatness of two sides is required to be 0.02Max, and the parallelism is 0.02Max; the height precision is 95-0.02, and the appearance precision is +/-0.5; 2M 20 lifting threaded holes are formed in the front surface and the rear surface of the die respectively, and the depth is 50;

(2) An upper die base plate: adopting Cr12MoV to process, wherein the heat treatment hardness is 58-60HRC, the size of the template is 500X200X30, the flatness requirements of both sides are 0.02Max, and the parallelism is 0.02Max; the height precision is 30+0.01;

(3) A stripper plate backing plate: adopting Cr12MoV to process, wherein the heat treatment hardness is 58-60HRC, the size of the template is 500X200X25, the flatness requirements of both sides are 0.02Max, and the parallelism is 0.02Max; the height precision is 25+0.01;

(4) Big stripper plate: pre-hard die steel P20 is adopted for processing, the size of a die holder is 700X700X40, the requirements on the flatness of two sides are 0.02Max, the parallelism is 0.02Max, and the height precision is 40-0.02; 2M 20 lifting threaded holes are formed in the front surface and the rear surface of the die respectively, and the depth is 50;

(5) Hard plate of stripper plate: processing by using SKD11, wherein the size of a template is 550X350X50, the flatness requirements of both sides are 0.02Max, and the parallelism is 0.02Max; the height precision is 50+0.01; the heat treatment hardness is 58-60HRC, the subzero treatment is carried out for 2 times in the heat treatment of the template, the aging treatment is required to be carried out for 4-7 days after the heat treatment of the template is finished, the template is vertically placed on a tray during the aging treatment, the height of the tray is more than 10 cm away from the ground, and the outdoor site is optimal; the main cutting edge, the punching needle fixing cavity and the inner guide sleeve hole are machined by slow wires, the cutting depth is more than 1 and 2, the precision of the positioning part is within +/-0.002, and the position precision is within 0.005;

(6) A concave template: processing by using SKD11, wherein the size of a template is 550X350X55, the flatness requirements of both sides are 0.02Max, and the parallelism is 0.02Max; the height precision is 55+0.01; the heat treatment hardness is 58-60HRC, 2 times of subzero treatment are carried in the heat treatment of the template, 4-7 days of aging treatment is needed after the heat treatment of the template is finished, and the treatment method in the aging treatment period is consistent with that of a small stripper plate; the positions of the cavity are fixed by the female die, the trimming insert and the punching sleeve by slow wire processing and cutting 1 to repair more than 2, and the precision of the positioning part is within +/-0.002;

(7) Die base plate: adopting Cr12MoV to process, wherein the heat treatment hardness is 58-60HRC, the size of the template is 550X350X25, the flatness requirements of both sides are 0.02Max, and the parallelism is 0.02Max; the height precision is 25+0.01;

(8) A lower die base plate: adopting Cr12MoV to process, wherein the heat treatment hardness is 58-60HRC, the size of the template is 550X350X30, the flatness requirements of both sides are 0.02Max, and the parallelism is 0.02Max; the height precision is 30+0.01;

(9) A lower die base: pre-hard die steel P20 is adopted for processing, the size of a die holder is 700X700X95, the flatness of two sides is required to be 0.02Max, and the parallelism is 0.02Max; the height precision is 95-0.02, and the appearance precision is +/-0.5; 2M 20 lifting threaded holes are formed in the front surface and the rear surface of the die respectively, and the depth is 50;

(10) A lower die hard insert: adopting Cr12MoV to process, wherein the heat treatment hardness is 58-60HRC, the size of the template is 450X200X95, the flatness requirements of both sides are 0.02Max, and the parallelism is 0.02Max; the height precision is 95+0.02;

(11) A thickening mechanism: the device comprises seven parts, namely 1) a driving column, 2) a force transmission block, 3) a thickening male die, 4) a thickening female die, 5) a supporting slide rail, 6) a backer, and 7) a die carrier; 1) The driving column is connected with an upper die base of the die, 4) the female die is thickened, 5) the sliding rail is supported, 6) the backer is positioned by utilizing the shape, the inner side of the backer is of a straight surface structure, the upper part of the backer is contacted with the force transmission block, the outer side of the backer is of a tapered wedge surface structure, and the backer is fastened on a 7) die base by using bolts;

i. the driving column is processed by SKD11, the size is 33X33X200, the heat treatment is 55-58HRC, 2 times of subzero treatment are carried in the heat treatment, 4-7 days of aging treatment are needed after the heat treatment is finished, the driving column is vertically placed on a tray during the aging treatment, the height of the tray is more than 10 cm above the ground, and the open-air site is optimal; the height precision is 200 plus or minus 0.5, the appearance precision is 33 plus or minus 0.05X33 plus or minus 0.05, and the verticality is 0.02max;

ii, processing a force transmission block SKD11 with the size of 33X33X25, carrying out heat treatment of 55-58HRC, carrying out cryogenic treatment for 2 times in the heat treatment, and carrying out aging treatment for 4-7 days after the heat treatment is finished; the height precision is 25 +/-0.05, and the appearance precision is 33 +/-0.1X33 +/-0.1;

the thickening male die is of a lower-figure wedge-shaped structure, powder high-speed steel is adopted for processing, the processing precision is +/-0.1, the angle precision is +/-0.5 degrees, and the roughness of a wedge surface is Ra0.8Max; heat treating for 58-60HRC, carrying out subzero treatment for 2 times in the heat treatment, and performing aging treatment for 4-7 days after the heat treatment is finished;

the thickening female die is processed by powder high-speed steel, the processing precision is +/-0.1, the angle precision is +/-0.5 degrees, and the roughness of a wedge surface is Ra0.8Max; performing heat treatment with a temperature of 58-60HRC, carrying out subzero treatment for 2 times in the heat treatment, and performing aging treatment for 4-7 days after the heat treatment is finished;

v, processing the support slide rail by adopting DC53, carrying out heat treatment with the hardness of 55-58HRC, carrying out cryogenic treatment for 2 times in the heat treatment, and carrying out aging treatment for 4-7 days after the heat treatment is finished; the roughness of the working surface of the supporting slide rail is Ra0.8Max, 3 oil grooves with the depth of 2mm and the depth of 1mm and the length of 40mm are processed on the working surface, and industrial butter or lithium-based grease is added into the oil grooves as a lubricating medium before working; the tail part of the working surface is provided with a limiting step with the height of 2mm, so that the thickened male die is prevented from being reset excessively;

vi, processing the backer by using Cr12, wherein the insert size is 30X50X170, the heat treatment hardness is 55-58HRC, the heat treatment is carried with 2 times of cryogenic treatment, and the aging treatment is required to be carried out for 4-7 days after the heat treatment is finished; the appearance processing precision is +/-0.5, the height precision is +/-1, and the verticality is 0.02; the 40mm root of the backer needs to be tightly fitted (the unilateral clearance is 0.01-0.02) and put into the lower die holder of the mould, the inside (straight line side) of the upper portion of the backer contacts with 2) outlet blocks, the outside is processed with a 10-degree inclined plane and connected with the root of the die holder, in order to transmit the stress of the upper portion contact part to the contact surface of the backer and the die holder, strengthen the stress intensity of the backer, prevent breaking; (ii) a

The die frame is a lower die holder of the die:

motion process and principle:

with the closing of the fine blanking press, 1) a driving block presses downwards, 2) a force transfer block, 2) the rear part of the force transfer block props against 6) a backer, and 3) a thickening male die is pushed forwards and 3) moves forwards along 5) a supporting slide rail; gradually pressing the front propped material inwards into the thickening cavity of the thickening female die of 8) of 4) along with the reduction of the sealing height until the molding is finished when the sealing height is 0;

when the die is opened (reset), 1) the driving column rises along with the upper die base, 2) the force transfer block loses upper pressure, and inward thrust is not applied to the 3) thickening male die any more; 4) In the thickening female die, 9) the other side of a spring in the reset spring hole is propped against the side wall of the thickening male die, 3) the thickening male die is pushed outwards, and the thickening male die does not have inwards pushing force, so that the thickening male die moves outwards under the force of the reset spring until the thickening male die moves back to the limiting position of the support slide rail, and 5) the thickening male die stops;

the die is fixed on a fine blanking workbench through a rapid clamping mechanism of a fine blanking machine; after passing through a leveling machine, feeding the raw materials into fine blanking equipment to a working surface of a die; adjusting the equipment parameters to the technical requirement range, performing trial production on the product, and adjusting the fine blanking equipment to a mass production linkage mode for mass production after the requirement of the drawing is met; (ii) a

4) Deburring:

removing burrs by adopting a crawler belt type abrasive belt at the rotating speed of 2000 revolutions; placing the part subjected to fine blanking on a fixed limit of equipment, applying pressure more than or equal to 30N above the part, dragging the part back and forth for 3-5 times, and taking out the part to confirm the burr removal condition; after confirming that the burr removal meets the technical requirements, mass production can be carried out;

5) Vibration grinding:

the vibration grinding cleaning line consists of a feeder, a rough cleaning station, a fine cleaning station, a rinsing station and a drying station;

firstly, pouring 20 boxes of thickened brake steel backing products which are punched to remove burrs into a feeding device, starting feeding, and then automatically feeding the products into a container of a cleaning station;

100KG brown corundum abrasive stones are filled in a vibration container of a cleaning work station, 10L of 5% water-based cleaning agent and 50L of aqueous solution are proportioned; grinding the product in a container for 15-20 minutes to remove oil stains on the surface of the product, burrs and acute angles on the periphery of the product, and then automatically guiding the product to a rinsing station;

100KG zircon abrasive is filled in a vibration container of a rinsing station, and 3% of water-based cleaning agent 5I,3-5% of antirust agent 5I and 50L of aqueous solution are proportioned; grinding the product in a container for 10-15 minutes to enable the surface of the product to be polished to be more glossy and the edge to be more round, removing attachments, and automatically guiding the product to a rinsing station;

3-5 percent of antirust agent solution 2L,3-5 percent of antirust agent solution 3L and 50L of aqueous solution are prepared in a water tank of a rinsing station, and the temperature of the aqueous solution is controlled at 30-40 ℃; the power of an ultrasonic generator of a work station is 80KHz, and after the product passes through the work station, the grinding material can be cleaned, and more than 95% of metal and nonmetal particles can be removed; the chain speed of the conveyor belt at the bottom of the water tank is controlled at the 4 th gear, and the product is conveyed to a drying station by the conveyor belt;

a vibration container of a drying station is filled with 100KG corncob drying medium, the temperature of the station is controlled at 80 ℃, and water drops on the surface of a product entering the station can be absorbed by the corncobs; automatically guiding the corn cobs into a vibrating screen at the tail of the work station, and directly conveying the corn cobs into a finished product turnover container after the majority of the corn cobs on the surface of the product are completely separated from the product by the vibrating screen; transporting to a downward moving station;

6) Shot blasting:

the shot blasting process aims at improving the roughness of the surface of a product, and the roughness requires Ra2.0-6.0;

the shot blasting equipment adopts a crawler-type shot blasting machine;

guiding 20 boxes of ground brake steel backing products subjected to thickening into a feeder of shot blasting equipment, and operating the feeder to pour the products onto a track of a shot blasting machine; starting equipment, putting sand and stone which are 0.7mm of carborundum into the equipment, closing an equipment bin door, starting an equipment working button, and pressing down a timer when the current reaches 18-20A; after working for 10 minutes, stopping the equipment; opening a bin door, taking out a piece of product, measuring the roughness, and taking out the product after confirming that the roughness meets the technical requirements;

7) Electroplating:

adopting a zinc-nickel plating process, and carrying out zinc-nickel plating treatment, wherein the thickness of a plated layer is 15-25 mu m; the salt spray test requirement of the zinc-plated nickel is 480H without red rust;

8) And (3) appearance full inspection:

will have enough to meet the need the container and deliver to and examine the work area entirely, put into the product and examine the platform entirely and wait to examine the district, the total inspection product, the inspection content has:

i. the appearance has the phenomena of collision damage, crushing damage, deformation and bottom exposure of a plating layer;

checking the completeness of the salient points, and confirming the height of the salient points by using a go-no go gauge;

checking the thickening height, confirming the thickening height using a go-no-go gauge;

checking the bright zone of the section of the supporting surface, and confirming that the requirement is met by more than 90%;

after the product is subjected to full inspection and qualified, the product is checked and confirmed by a quality part, and after the quality part receives a check report notice, the product is subjected to sampling inspection and 5pcs rechecking;

9) Packaging and warehousing:

after receiving the information which is qualified, the packaging and warehousing work can be carried out, and the packaging is carried out according to the following packaging scheme;

and after the packaging is finished, sending the finished product into a finished product warehouse to make a warehouse location.

The technical requirements of the parts are further improved through the process:

1. the section bright band of the steel backing support part of the brake pad is required to be more than 90 percent;

2. the thickness of the raw material of the steel backing of the brake pad is 6.0mm +/-0.15;

3. the thickened part of the steel back of the brake pad meets 8.0mm +/-0.3;

4. the tolerance requirements of the total length and the lug width of the brake pad steel backing are +/-0.05;

5. the flatness requirement of the steel backing of the brake pad is 0.1Max;

6. the surface roughness Ra2.0-6.0 of the steel back of the brake pad;

7. carrying out zinc-nickel plating treatment on the surface of the steel back of the brake pad, wherein the thickness of the plated layer is 15-25 mu m;

8. the brake pad steel back salt spray test requires 480H to have no red rust;

9. the yield requirement on the steel back of the brake pad is more than or equal to 275MPa, and the tensile strength is 430-580 MPa.

According to the test and the improvement, a set of fine blanking manufacturing process flow mainly comprising a fine blanking machine and a fine blanking die with a thickening structure in the fine blanking die is finally completed. Compared with the steel backing manufactured by the traditional process, the product has more stable size, higher efficiency and lower processing cost.

The invention provides a rear brake steel backing fine blanking manufacturing process with thickening, which aims to realize the control and operation of mass production of thickened products.

Drawings

FIG. 1 is a schematic diagram of a thickened detail of the product of the invention;

FIG. 2 is a schematic diagram of 6 process steps of fine blanking a die according to the present invention;

FIG. 3 is a schematic process flow diagram of the present invention.

Detailed Description

The technical scheme of the invention is further specifically described by the following embodiments and the accompanying drawings.

Example 1: as shown in the figure, the rear brake steel backing fine blanking manufacturing process with thickening comprises the following steps:

(I) a process flow:

the product is mainly processed by the following process flows: storing OP10 raw materials in a warehouse; storing OP20 raw material; OP30 fine blanking; removing burrs by OP 40; OP50 vibration grinding; OP60 shot blasting; OP70 electroplating; OP80 appearance complete inspection; OP90 packaging and warehousing for 9 process links;

(II) process description:

10 Raw material warehousing:

raw material trade mark: s275JR, the thickness of the material is 6.0mm +/-0.15, and the material meets the Q/BQB303-2018 Bao steel standard raw material;

the width of each coil of material is measured by a caliper, and the requirement of 124min needs to be met;

extracting 1 roll of raw materials in each batch, and cutting plates with areas of 300mm and 300mm, wherein 2 material test rods are manufactured, one test rod is used for an experiment, and the other test rod is reserved in a quality department; clamping a material test bar on a chuck of UTM equipment, performing a physical property test on the raw material, and recording the yield strength and the tensile strength of the raw material; the upper yield strength needs to satisfy: more than or equal to 275MPa; the tensile strength needs to meet the following requirements: 430MPa to 580MPa;

2 50mm square test blocks are manufactured, one test block is used for an experiment, and the other test block is reserved; the test block is placed on a spectrometer test table board, chemical element analysis tests of raw materials are carried out, and the content of each chemical element of the raw materials is recorded, and the requirements are met: c% is less than or equal to 0.18; si% is less than or equal to 0.35; mn% is less than or equal to 1.50; p% is less than or equal to 0.025; s% is less than or equal to 0.020; n% is less than or equal to 0.012; ceq% is less than or equal to 0.40;

11 Raw material storage:

the storage environment requirement of the raw material steel coil is as follows: drying, ventilating and avoiding damp, the situations of water leakage and water accumulation can not occur, if the hidden danger exists, the raw materials are immediately transferred, and the hidden danger is eliminated in time; the raw materials are required to be stored in a special storage position, the special storage position is made of an I-shaped steel structure, and a sleeper is used at a part in contact with the materials, so that the problems of indentation, pits and scratch appearance on the surfaces of the materials caused by collision are solved; (ii) a

The storage requirement of the raw material steel coil is as follows: the steel coils are vertically stacked and cannot be obliquely placed or inversely placed; after the certificate is stored, the certificate is required to be marked and attached;

12 Fine blanking:

through oil pressure formula 650T fine blanking equipment, the relevant parameter of equipment should satisfy following requirement:

(1) The main pressure is 4500-5000 Kn;

(2) The blank holder force is 1500-2000 Kn;

(3) The counter pressure is 300-500 Kn;

(4) Foreign matter monitoring pressure is 14-15 Mpa;

(5) Monitoring an emergency stop stroke by foreign matters for 2mm; (ii) a

The precision requirement of the fine blanking equipment should meet:

(1) The repeated precision of the slide block can reach 0.02;

(2) The flatness of the upper table surface and the lower table surface of the mounting surface is 0.02;

(3) The parallelism of the upper table surface and the lower table surface of the mounting surface is 0.02;

the fine blanking die is completed in a progressive die mode, and the processes in the die mainly comprise the following steps:

(1) Forming a bevel edge; (2) pre-flushing; (3) thickening and forming; (4) punching positioning holes; (5) bump forming; (6) blanking; finishing 6 steps; (ii) a

The main structure of the fine blanking die consists of an upper die 8 template and a lower die 8 template and a thickening mechanism:

(10) An upper die base: pre-hard die steel P20 is adopted for processing, the size of a die holder is 700X700X95, the flatness of two sides is required to be 0.02Max, and the parallelism is 0.02Max; the height precision is 95-0.02, and the appearance precision is +/-0.5; 2M 20 lifting threaded holes with the depth of 50 are respectively formed in the front and the rear of the die;

(11) An upper die base plate: adopting Cr12MoV to process, wherein the heat treatment hardness is 58-60HRC, the size of the template is 500X200X30, the flatness requirements of both sides are 0.02Max, and the parallelism is 0.02Max; the height precision is 30+0.01;

(12) A stripper plate backing plate: processing by adopting Cr12MoV, wherein the heat treatment hardness is 58-60HRC, the size of the template is 500X200X25, the two-side flatness requirement is 0.02Max, and the parallelism is 0.02Max; the height precision is 25+0.01;

(13) Big stripper plate: pre-hardened die steel P20 is adopted for processing, the size of a die holder is 700X700X40, the flatness requirements of two sides are 0.02Max, the parallelism is 0.02Max, and the height precision is 40-0.02; 2M 20 lifting threaded holes are formed in the front surface and the rear surface of the die respectively, and the depth is 50;

(14) Hard plate of stripper plate: processing by using SKD11, wherein the size of a template is 550X350X50, the flatness requirements of both sides are 0.02Max, and the parallelism is 0.02Max; the height precision is 50+0.01; the heat treatment hardness is 58-60HRC, the subzero treatment is carried out for 2 times in the heat treatment of the template, the aging treatment is required to be carried out for 4-7 days after the heat treatment of the template is finished, the template is vertically placed on a tray during the aging treatment, the height of the tray is more than 10 cm away from the ground, and the outdoor site is optimal; the main cutting edge, the punching needle fixing cavity and the inner guide sleeve hole are machined by slow wires, the cutting depth is more than 1 and 2, the precision of the positioning part is within +/-0.002, and the position precision is within 0.005;

(15) A concave template: processing by using SKD11, wherein the size of the template is 550X350X55, the flatness requirement of both sides is 0.02Max, and the parallelism is 0.02Max: the height precision is 55+0.01; the heat treatment hardness is 58-60HRC, 2 times of subzero treatment are carried in the heat treatment of the template, 4-7 days of aging treatment is needed after the heat treatment of the template is finished, and the treatment method in the aging treatment period is consistent with that of a small stripper plate; the positions of the cavity are fixed by the female die, the trimming insert and the punching sleeve by slow wire processing and cutting 1 to repair more than 2, and the precision of the positioning part is within +/-0.002;

(16) Die backing plate: adopting Cr12MoV to process, wherein the heat treatment hardness is 58-60HRC, the size of the template is 550X350X25, the flatness requirements of both sides are 0.02Max, and the parallelism is 0.02Max; the height precision is 25+0.01;

(17) A lower die base plate: adopting Cr12MoV to process, wherein the heat treatment hardness is 58-60HRC, the size of the template is 550X350X30, the flatness requirements of both sides are 0.02Max, and the parallelism is 0.02Max; the height precision is 30+0.01;

(18) A lower die base: pre-hardened die steel P20 is adopted for processing, the size of a die holder is 700X700X95, the flatness requirements of two sides are 0.02Max, and the parallelism is 0.02Max; the height precision is 95-0.02, and the appearance precision is +/-0.5; 2M 20 lifting threaded holes are formed in the front surface and the rear surface of the die respectively, and the depth is 50;

(10) A lower die hard insert: processing by adopting Cr12MoV, wherein the heat treatment hardness is 58-60HRC, the size of the template is 450X200X95, the two-side flatness requirement is 0.02Max, and the parallelism is 0.02Max; the height precision is 95+0.02;

(11) A thickening mechanism: the device comprises seven parts, namely 1) a driving column, 2) a force transmission block, 3) a thickening male die, 4) a thickening female die, 5) a supporting slide rail, 6) a backer, and 7) a die carrier; 1) The driving column is connected with an upper die base of the die, 4) the female die is thickened, 5) the sliding rail is supported, 6) the backer is positioned by utilizing the shape, the inner side of the backer is of a straight surface structure, the upper part of the backer is contacted with the force transmission block, the outer side of the backer is of a tapered wedge surface structure, and the backer is fastened on a 7) die base by using bolts;

i. the driving column is processed by SKD11, the size is 33X33X200, the heat treatment is 55-58HRC, 2 times of deep cooling treatment is carried in the heat treatment, 4-7 days of aging treatment are needed after the heat treatment is finished, the driving column is vertically placed on a tray during the aging treatment, the height of the tray is more than 10 cm away from the ground, and the driving column is optimal in an open field: the height precision is 200 plus or minus 0.5, the appearance precision is 33 plus or minus 0.05X33 plus or minus 0.05, and the verticality is 0.02max;

ii, processing a force transmission block SKD11 with the size of 33X33X25, carrying out heat treatment of 55-58HRC, carrying out cryogenic treatment for 2 times in the heat treatment, and carrying out aging treatment for 4-7 days after the heat treatment is finished; the height precision is 25 +/-0.05, and the shape precision is 33 +/-0.1X33 +/-0.1;

the thickening male die is of a lower-figure wedge-shaped structure, powder high-speed steel is adopted for processing, the processing precision is +/-0.1, the angle precision is +/-0.5 degrees, and the roughness of a wedge surface is Ra0.8Max; performing heat treatment with a temperature of 58-60HRC, carrying out subzero treatment for 2 times in the heat treatment, and performing aging treatment for 4-7 days after the heat treatment is finished;

the thickening female die is processed by powder high-speed steel, the processing precision is +/-0.1, the angle precision is +/-0.5 degrees, and the roughness of a wedge surface is Ra0.8Max; performing heat treatment with a temperature of 58-60HRC, carrying out subzero treatment for 2 times in the heat treatment, and performing aging treatment for 4-7 days after the heat treatment is finished;

v, processing the support slide rail by adopting DC53, carrying out heat treatment with the hardness of 55-58HRC, carrying out cryogenic treatment for 2 times in the heat treatment, and carrying out aging treatment for 4-7 days after the heat treatment is finished; the roughness of the working surface of the supporting slide rail is Ra0.8Max, 3 oil grooves with the depth of 2mm and the depth of 1mm and the length of 40mm are processed on the working surface, and industrial butter or lithium-based grease is added into the oil grooves as a lubricating medium before working; the tail part of the working surface is provided with a limiting step with the height of 2mm, so that the excessive resetting of the thickening male die is prevented;

vi, processing the backer by adopting Cr12, wherein the insert size is 30X50X170, the heat treatment hardness is 55-58HRC, the heat treatment is carried with 2 times of subzero treatment, and the aging treatment is required to be carried out for 4-7 days after the heat treatment is finished; the appearance processing precision is +/-0.5, the height precision is +/-1, and the verticality is 0.02; 40mm of the root of the backer needs to be tightly matched (the single-side gap is 0.01-0.02) and arranged in a lower die holder of a die, the inner side (linear side) of the upper part of the backer is contacted with the output block 2), and a 10-degree inclined plane is processed on the outer side to be connected with the root of the die holder, so that the stress of the upper contact part is transferred to the contact surface of the backer and the die holder, the stress strength of the backer is enhanced, and the breaking is prevented; (ii) a

The die frame is a lower die holder of the die:

motion process and principle:

with the closing of the fine punching machine, 1) a driving block presses downwards 2) a force transfer block, 2) the rear part of the force transfer block props against 6) a backer, and 3) a thickening male die is pushed forwards and moves forwards along 5) a supporting slide rail; gradually pressing the front propped material inwards into the thickening cavity of the thickening female die of 8) of 4) along with the reduction of the sealing height until the molding is finished when the sealing height is 0;

when the die is opened (reset), 1) the driving column rises along with the upper die base, 2) the force transfer block loses upper pressure, and inward thrust is not applied to the 3) thickening male die any more; 4) In the thickening female die, 9) the other side of a spring in the reset spring hole is propped against the side wall of the thickening male die, 3) the thickening male die is pushed outwards, and the thickening male die does not have inwards pushing force, so that the thickening male die moves outwards under the force of the reset spring until the thickening male die moves back to the limiting position of the support slide rail, and 5) the thickening male die stops;

the die is fixed on a fine blanking workbench through a rapid clamping mechanism of the fine blanking machine; after passing through a leveling machine, feeding the raw materials into fine blanking equipment to a working surface of a die; adjusting the equipment parameters to the technical requirement range, performing trial production on the product, and adjusting the fine blanking equipment to a mass production linkage mode for mass production after the requirement of the drawing is met; (ii) a

13 ) deburring:

removing burrs by adopting a crawler belt type abrasive belt at the rotating speed of 2000 revolutions; placing the part subjected to fine blanking on a fixed limit of equipment, applying pressure more than or equal to 30N above the part, dragging the part back and forth for 3-5 times, and taking out the part to confirm the burr removal condition; after confirming that the burr removal meets the technical requirements, mass production can be carried out;

14 Vibration grinding:

the vibration grinding and cleaning line consists of a feeder, a rough cleaning station, a fine cleaning station, a rinsing station and a drying station;

firstly, pouring 20 boxes of thickened brake steel backing products which are punched to remove burrs into a feeding device, starting feeding, and then automatically feeding the products into a container of a cleaning station;

100KG brown corundum grinding stones are filled in a vibration container of the cleaning station, and 10L of 5% water-based cleaning agent and 50L of aqueous solution are proportioned; grinding the product in a container for 15-20 minutes to remove oil stains on the surface of the product, burrs and acute angles on the periphery of the product, and then automatically guiding the product to a rinsing station;

100KG zircon abrasive is filled in a vibration container of a rinsing station, and 3% of water-based cleaning agent 5L,3-5% of antirust agent 5L and 50L of aqueous solution are proportioned; grinding the product in a container for 10-15 minutes to enable the surface of the product to be polished to be more glossy and the edge to be more round, removing attachments, and automatically guiding the product to a rinsing station;

3-5 percent of antirust agent solution 2L,3-5 percent of antirust agent solution 3L and 50L of aqueous solution are prepared in a water tank of a rinsing station, and the temperature of the aqueous solution is controlled at 30-40 ℃; the power of an ultrasonic generator in a work station is 80KHz, and the product can clean the abrasive and remove more than 95% of metal and nonmetal particles after passing through the work station; the chain speed of the conveyor belt at the bottom of the water tank is controlled at the 4 th gear, and the product is conveyed to a drying station by the conveyor belt;

a vibration container of a drying station is filled with 100KG corncob drying medium, the temperature of the station is controlled at 80 ℃, and water drops on the surface of a product entering the station can be absorbed by the corncobs; automatically guiding the corn cobs into a vibrating screen at the tail of the work station, and directly conveying the corn cobs into a finished product turnover container after the majority of the corn cobs on the surface of the product are completely separated from the product by the vibrating screen; transporting to a downward moving station;

15 Shot blasting:

the shot blasting process aims to improve the roughness of the surface of the product, and the roughness is required to be Ra2.0-6.0;

the shot blasting equipment adopts a crawler-type shot blasting machine;

leading 20 boxes of the brake steel backing product subjected to grinding and thickening into a feeder of shot blasting equipment, and operating the feeder to pour the product onto a track of a shot blasting machine; starting equipment, putting sand and stone which are 0.7mm of carborundum into the equipment, closing an equipment bin door, starting an equipment working button, and pressing down a timer when the current reaches 18-20A; after working for 10 minutes, stopping the equipment; opening a bin door, taking out a piece of product, measuring the roughness, and taking out the product after confirming that the roughness meets the technical requirements;

16 Plating:

adopting a zinc-nickel plating process, and carrying out zinc-nickel plating treatment, wherein the thickness of the plated layer is 15-25 mu m; the salt spray test of the zinc-plated nickel requires 480H without red rust;

17 Appearance full inspection:

will have enough to meet the need the container and deliver to and examine the work area entirely, put into the product and examine the platform entirely and wait to examine the district, the total inspection product, the inspection content has:

i. the appearance has the phenomena of collision damage, crushing damage, deformation and bottom exposure of a plating layer;

checking the integrity of the bumps, and confirming the heights of the bumps by using a go-no go gauge;

checking the thickening height, confirming the thickening height using a go-no-go gauge;

checking the bright zone of the section of the supporting surface, and confirming that the requirement is met by more than 90%;

after the product is subjected to full inspection and is qualified, the product is checked and confirmed by a quality part, and after the quality part receives a check notification, the product is subjected to sampling inspection and 5pcs recheck;

18 Packaging and warehousing:

after receiving the information of qualified confirmation, the packaging and warehousing work can be carried out, and the packaging is carried out according to the following packaging scheme;

and after the packaging is finished, sending the finished product into a finished product warehouse to make a warehouse location.

Claims (1)

1. A rear brake steel backing fine blanking manufacturing process with thickening is characterized by comprising the following steps:

(I) a process flow:

the product is mainly processed by the following process flows: storing OP10 raw materials in a warehouse; storing OP20 raw material; OP30 fine blanking; OP40 deburring, OP50 vibration grinding, OP60 shot blasting, OP70 electroplating and OP80 appearance full inspection; OP90 packaging and warehousing for 9 process links;

(II) process description:

1) Warehousing raw materials:

raw material trade mark: s275JR, the material thickness is 6.0mm +/-0.15, and the material meets the Bao steel standard raw material of Q/BQB 303-2018;

the width of each coil of material is measured by a caliper, and the requirement of 124min needs to be met;

extracting 1 roll of raw materials in each batch, and cutting plates with areas of 300mm and 300mm, wherein 2 material test rods are manufactured, one test rod is used for an experiment, and the other test rod is reserved in a quality department; clamping a material test bar on a chuck of UTM equipment, performing a physical property test of the raw material, and recording the yield strength and the tensile strength of the raw material; the upper yield strength needs to satisfy: not less than 275MPa; the tensile strength needs to meet the following requirements: 430MPa to 580MPa;

2 50mm square test blocks are manufactured, one test block is used for an experiment, and the other test block is reserved; the test block is placed on a spectrometer test table board, chemical element analysis tests of raw materials are carried out, and the content of each chemical element of the raw materials is recorded, and the requirements are met: c% is less than or equal to 0.18; si% is less than or equal to 0.35; mn% is less than or equal to 1.50; p% is less than or equal to 0.025; s% is less than or equal to 0.020; n% is less than or equal to 0.012; ceq% is less than or equal to 0.40;

2) Raw material storage:

the storage environment requirement of the raw material steel coil is as follows: drying, ventilating and avoiding damp, the situations of water leakage and water accumulation can not occur, if the hidden danger exists, the raw materials are immediately transferred, and the hidden danger is eliminated in time; the raw materials are required to be stored in a special storage position, the special storage position is made of an I-shaped steel structure, and a sleeper is used at a part in contact with the materials, so that the problems of indentation, pits and scratch appearance on the surfaces of the materials caused by collision are solved;

the storage requirement of the raw material steel coil is as follows: the steel coils are vertically stacked and cannot be obliquely placed or inversely placed; after the certificate is stored, the certificate is required to be marked and attached;

3) Fine blanking:

through oil pressure formula 650T fine blanking equipment, the relevant parameter of equipment should satisfy following requirement:

(1) The main pressure is 4500-5000 Kn;

(2) The blank holder force is 1500-2000 Kn;

(3) The counter pressure is 300-500 Kn;

(4) Monitoring the pressure of the foreign matters at 14-15Mpa;

(5) Monitoring an emergency stop stroke by foreign matters for 2mm;

the precision requirement of the fine blanking equipment should meet:

(1) The repeated precision of the slide block can reach 0.02;

(2) The flatness of the upper table surface and the lower table surface of the mounting surface is 0.02;

(3) The parallelism of the upper table surface and the lower table surface of the mounting surface is 0.02;

the fine blanking die is completed in a progressive die form, and the process of each step in the die mainly comprises the following steps:

(1) Forming a bevel edge; (2) pre-punching; (3) thickening and forming; (4) punching positioning holes; (5) bump forming; (6) blanking; 6 steps are finished;

the main structure of the fine blanking die consists of an upper die 8 template and a lower die 8 template and a thickening mechanism:

(1) An upper die holder: pre-hard die steel P20 is adopted for processing, the size of a die holder is 700X700X95, the flatness of two sides is required to be 0.02Max, and the parallelism is 0.02Max; the height precision is 95-0.02, and the appearance precision is +/-0.5; 2M 20 lifting threaded holes are formed in the front surface and the rear surface of the die respectively, and the depth is 50;

(2) An upper die base plate: adopting Cr12MoV for processing, wherein the heat treatment hardness is 58-60HRC, the size of the template is 500X200X30, the flatness requirements of both sides are 0.02Max, the parallelism is 0.02Max, and the height precision is 30+0.01;

(3) A stripper plate backing plate: adopting Cr12MoV to process, wherein the heat treatment hardness is 58-60HRC, the size of the template is 500X200X25, the flatness requirements of both sides are 0.02Max, and the parallelism is 0.02Max; the height precision is 25+0.01;

(4) Big stripper plate: pre-hardened die steel P20 is adopted for processing, the size of a die holder is 700X700X40, the flatness requirements of two sides are 0.02Max, the parallelism is 0.02Max, and the height precision is 40-0.02, 2M 20 lifting threaded holes are respectively formed in the front and the back of the die, and the depth is 50;

(5) Hard plate of stripper plate: processing by adopting SKD11, wherein the size of the template is 550X350X50, the flatness of two sides requires 0.02Max, the parallelism is 0.02Max, the height precision is 50+0.01, the heat treatment hardness is 58-60HRC, the heat treatment of the template is carried with 2 times of subzero treatment, the aging treatment is required to be carried out for 4-7 days after the heat treatment of the template is finished, the template is vertically placed on a tray during the aging treatment, the height of the tray is over 10 cm away from the ground, and the best outdoor site is obtained; the main cutting edge, the punching needle fixing cavity and the inner guide sleeve hole are machined by slow wires, the cutting depth is more than 1 and 2, the precision of the positioning part is within +/-0.002, and the position precision is within 0.005;

(6) A concave template: adopting SKD11 for processing, wherein the size of a template is 550X350X55, the flatness of two sides requires 0.02Max, the parallelism is 0.02Max, the height precision is 55+0.01, the heat treatment hardness is 58-60HRC, the template is carried with 2 times of deep cooling treatment in the heat treatment, the aging treatment needs to be carried out for 4-7 days after the heat treatment of the template is finished, the treatment method in the aging treatment period is consistent with the treatment method of a small unloading plate, the positions of a female die, an edge cutting insert and a punching sleeve fixing cavity are cut by slow wires for more than 1 repair, and the precision of a positioning part is within +/-0.002;

(7) Die base plate: adopting Cr12MoV for processing, wherein the heat treatment hardness is 58-60HRC, the size of the template is 550X350X25, the flatness requirements of two sides are 0.02Max, the parallelism is 0.02Max, and the height precision is 25+0.01;

(8) A lower die base plate: adopting Cr12MoV for processing, wherein the heat treatment hardness is 58-60HRC, the size of the template is 550X350X30, the flatness requirements of two sides are 0.02Max, the parallelism is 0.02Max, and the height precision is 30+0.01;

(9) A lower die base: pre-hardened die steel P20 is adopted for processing, the size of a die holder is 700X700X95, the flatness requirements of two sides are 0.02Max, and the parallelism is 0.02Max; the height precision is 95-0.02, and the appearance precision is +/-0.5; 2M 20 lifting threaded holes are formed in the front surface and the rear surface of the die respectively, and the depth is 50;

(10) A lower die hard insert: cr12MoV is adopted for processing, the heat treatment hardness is 58-60HRC, the size of the template is 450X200X95, the requirements on the planeness of two sides are 0.02Max, the parallelism is 0.02Max, and the height precision is 95+0.02;

(11) The thickening mechanism consists of seven parts, namely a driving column, a force transmission block, a thickening male die, a thickening female die, a support sliding rail, a backer and a die frame; the driving column is connected with an upper die base of the die, the female die is thickened, the sliding rail is supported, and the backer is positioned by utilizing the shape, the inner side of the backer is of a straight surface structure, the upper part of the backer is contacted with the force transmission block, the outer side of the backer is of an inclined wedge surface structure, and the driving column is fastened on the die base by using bolts;

i. the driving column is processed by SKD11, the size is 33X33X200, the heat treatment is 55-58HRC, 2 times of deep cooling treatment is carried in the heat treatment, 4-7 days of aging treatment is needed after the heat treatment is finished, the driving column is vertically placed on a tray during the aging treatment, the height of the tray is more than 10 cm above the ground, and the driving column is the best in an open field, the height precision is 200 +/-0.5, the appearance precision is 33 +/-0.05X33 +/-0.05, and the verticality is 0.02max;

ii, processing a force transfer block SKD11 with the size of 33X33X25, carrying out heat treatment with 55-58HRC, carrying out cryogenic treatment for 2 times in the heat treatment, and carrying out aging treatment for 4-7 days after the heat treatment is finished, wherein the height precision is 25 +/-0.05, and the appearance precision is 33 +/-0.1X33 +/-0.1;

the thickening male die is of a lower-figure wedge-shaped structure, powder high-speed steel is adopted for processing, the processing precision is +/-0.1, the angle precision is +/-0.5 degrees, and the roughness of a wedge surface is Ra0.8Max; performing heat treatment with a temperature of 58-60HRC, carrying out subzero treatment for 2 times in the heat treatment, and performing aging treatment for 4-7 days after the heat treatment is finished;

the thickening female die is processed by powder high-speed steel, the processing precision is +/-0.1, the angle precision is +/-0.5 degrees, and the roughness of a wedge surface is Ra0.8Max; performing heat treatment with a temperature of 58-60HRC, carrying out subzero treatment for 2 times in the heat treatment, and performing aging treatment for 4-7 days after the heat treatment is finished;

v, processing the support slide rail by adopting DC53, carrying out heat treatment with the hardness of 55-58HRC, carrying out cryogenic treatment for 2 times in the heat treatment, and carrying out aging treatment for 4-7 days after the heat treatment is finished; the roughness of the working surface of the supporting slide rail is Ra0.8Max, 3 oil grooves with the depth of 2mm and the depth of 1mm and the length of 40mm are processed on the working surface, and industrial butter or lithium-based grease is added into the oil grooves as a lubricating medium before working; the tail part of the working surface is provided with a limiting step with the height of 2mm, so that the thickened male die is prevented from being reset excessively;

vi, processing the backer by adopting Cr12, wherein the insert size is 30X50X170, the heat treatment hardness is 55-58HRC, the heat treatment is carried with 2 times of subzero treatment, and the aging treatment is required to be carried out for 4-7 days after the heat treatment is finished; the appearance processing precision is +/-0.5, the height precision is +/-1, and the verticality is 0.02; the 40mm of the backer root needs to be tightly assembled into a lower die seat of a die, and the tight assembly single-side gap is 0.01-0.02; the inner side of the upper part of the backer is contacted with the force transmission block, and the inner side refers to a straight line side; the outer side of the die holder is processed with a 10-degree inclined plane to be connected with the root of the die holder, so that the stress of the upper contact part is transferred to the contact surface of the backer and the die holder, the stress strength of the backer is enhanced, and the backer is prevented from being broken;

the die frame is a lower die holder of the die:

the motion process and principle are as follows:

with the closing of the fine blanking machine, the driving block presses the force transfer block downwards, the rear part of the force transfer block props against the backer, the thickening male die is pushed forwards, and the thickening male die moves forwards along the support sliding rail; gradually pressing the front propped material inwards into a thickening cavity of the thickening female die along with the reduction of the sealing height until the molding is finished when the sealing height is 0;

when the mold is opened, the opening means resetting, the driving column rises along with the upper mold base, the force transfer block loses the upper pressure, and inward thrust is not applied to the thickening male mold any more; the other side of the spring in the reset spring hole in the thickening female die is propped against the side wall of the thickening male die to push outwards, and the thickening male die does not have inwards pushing force and moves outwards under the force of the reset spring until the thickening male die moves back to the limit position of the supporting slide rail;

the die is fixed on a fine blanking workbench through a rapid clamping mechanism of the fine blanking machine; after passing through a leveling machine, feeding the raw materials into fine blanking equipment to a working surface of a die; adjusting the equipment parameters to the technical requirement range, performing trial production on the product, and adjusting the fine blanking equipment to a mass production linkage mode for mass production after the requirement of the drawing is met;

4) Deburring:

putting the part subjected to fine blanking on a fixed limit of equipment, applying pressure more than or equal to 30N above the part, dragging the part back and forth for 3-5 times, taking out the part to confirm the burr removal condition, and then confirming that the burr removal meets the technical requirements, thus realizing mass production;

5) Vibration grinding:

the vibration grinding cleaning line consists of a feeder, a rough cleaning station, a fine cleaning station, a rinsing station and a drying station;

firstly, pouring 20 boxes of thickened brake steel backing products which are punched to remove burrs into a feeding device, starting feeding, and then automatically feeding the products into a container of a cleaning station;

the product is ground in the container for 15-20 minutes, can remove oil stains on the surface of the product, burrs and acute angles on the periphery of the product, and then is automatically guided out to a rinsing station;

100KG zircon abrasive materials are filled in a vibration container of a rinsing station, 5L of 3% water-based cleaning agent, 5L of 3-5% antirust agent and 50L of aqueous solution are proportioned, a product is ground in the container for 10-15 minutes, the surface of the product can be ground, the surface of the product is glossy, the edge of the product is smoother, attachments are removed, and then the product is automatically led out to the rinsing station;

3-5% of antirust agent solution 2L,3-5% of antirust agent solution 3L and 50L of aqueous solution are matched in a water tank of a rinsing station, the temperature of the aqueous solution is controlled to be 30-40 ℃, the power of an ultrasonic generator of the station is 80KHz, a product can clean a grinding material and remove more than 95% of metal and non-metal particles after passing through the station;

a vibrating container of a drying station is filled with 100KG corncob drying medium, the temperature of the station is controlled at 80 ℃, water drops on the surface of a product after entering the station can be absorbed by the corncobs, the product is automatically guided into a vibrating screen at the tail of the station, most of the corncobs on the surface of the product are completely separated from the product through the vibrating screen, and the product is directly conveyed into a finished product turnover container; transporting to a downward moving station;

6) Shot blasting:

the shot blasting process aims at improving the roughness of the surface of a product, and the roughness requires Ra2.0-6.0;

the shot blasting equipment adopts a crawler-type shot blasting machine;

leading 20 boxes of the brake steel backing product subjected to grinding and thickening into a feeder of shot blasting equipment, and operating the feeder to pour the product onto a track of a shot blasting machine; starting equipment, putting sand and stone which are 0.7mm of carborundum into the equipment, closing an equipment bin door, starting an equipment working button, and pressing down a timer when the current reaches 18-20A; after working for 10 minutes, stopping the equipment; opening a bin door, taking out a piece of product, measuring the roughness, and taking out the product after confirming that the roughness meets the technical requirements;

7) Electroplating:

adopting a zinc-nickel plating process, and carrying out zinc-nickel plating treatment, wherein the thickness of a plated layer is 15-25 mu m; the salt spray test of the zinc-plated nickel requires 480H without red rust;

8) And (3) appearance full inspection:

will have enough to meet the need the container and deliver to and examine the work area entirely, put into the product and examine the platform entirely and wait to examine the district, the total inspection product, the inspection content has:

i. the appearance has the phenomena of collision damage, pressure damage, deformation and bottom exposure of a plating layer;

checking the completeness of the salient points, and confirming the height of the salient points by using a go-no go gauge;

checking the thickening height, confirming the thickening height using a go-no-go gauge;

checking the bright zone of the section of the supporting surface, and confirming that the requirement is met by more than 90%;

after the product is subjected to full inspection and qualified, the product is checked and confirmed by a quality part, and after the quality part receives a check report notice, the product is subjected to sampling inspection and 5pcs rechecking;

9) Packaging and warehousing:

after receiving the information which is qualified, the packaging and warehousing work can be carried out, and the packaging is carried out according to the following packaging scheme;

and after the packaging is finished, sending the finished product into a finished product warehouse to make a warehouse location.

Images