CN111590004A - Manufacturing integral stainless steel oil rail forging and manufacturing process thereof - Google Patents
Manufacturing integral stainless steel oil rail forging and manufacturing process thereof Download PDFInfo
- Publication number
- CN111590004A CN111590004A CN202010454531.3A CN202010454531A CN111590004A CN 111590004 A CN111590004 A CN 111590004A CN 202010454531 A CN202010454531 A CN 202010454531A CN 111590004 A CN111590004 A CN 111590004A
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- Prior art keywords
- forging
- lower die
- discharging
- trimming
- stainless steel
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
- B21J5/02—Die forging; Trimming by making use of special dies ; Punching during forging
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J13/00—Details of machines for forging, pressing, or hammering
- B21J13/02—Dies or mountings therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
- B21J5/002—Hybrid process, e.g. forging following casting
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C29/00—Bearings for parts moving only linearly
Abstract
The invention relates to the technical field of die forging, in particular to a forging process for manufacturing an integral stainless steel oil rail forging, and mainly solves the technical problem that the oil rail product has uneven wall thickness and further has oil leakage at a thin wall (or solves the problem that the oil rail has uneven wall thickness and further has oil leakage at the thin wall on the premise of not reducing the existing manufacturing efficiency).
Description
Technical Field
The invention relates to the technical field of die forging, in particular to a manufacturing integral stainless steel oil rail forging and a manufacturing process thereof.
Background
The integral forged stainless steel oil rail is used as a key part of an engine, and has higher requirements on the shape and the size precision of a product. According to different shape characteristics of products, the shapes of similar long-shaft stainless steel oil rails are irregular, the forging part is heated unevenly in the forging production process, the products can be subjected to plastic deformation and elastic deformation, the deformation can affect the sizes of the main pipe 1-1 straightness, the oil injector seat 1-2 position degree, the center distance and the like of the products, and the products are shown in figure 1.
In order to improve the reliability of the oil rail under high working pressure, Chinese patent CN107299295A discloses a stainless steel oil rail formed by integral forging, and discloses that the manufacturing process of the stainless steel oil rail forge piece comprises the steps of blanking, heating, forging and forming, trimming, quenching, shot blasting, pickling and passivating. Chinese patent CN201810392422.6 also discloses an integrally forged stainless steel oil rail, and discloses that the manufacturing process of the stainless steel oil rail comprises the steps of blanking, heating, forging, trimming, cooling, shot blasting, solid solution
In the prior art scheme, the influence of the forging process on the service performance of the oil rail is not considered to be perfect, and the problem that the wall thickness of the oil rail finished product obtained according to the prior art scheme is uneven is easily caused, so that oil leakage occurs at the thin wall when the oil rail is actually in service, and the reliability of the oil rail under high working pressure is reduced.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the integral stainless steel oil rail forging and the manufacturing process thereof are provided, and the problems are solved by comprehensively improving the forging structure, the manufacturing process device and parameters.
In a first aspect, the embodiment of the invention provides an integral stainless steel oil rail forging, wherein the straightness of a main pipe part of the forging is not more than 0.6mm, and the position degree is not more than 1 mm.
In a second aspect, an embodiment of the present invention provides a manufacturing process for manufacturing an integral stainless steel oil rail forging, which includes:
a manufacturing process for manufacturing an integral stainless steel oil rail forging comprises the following steps,
s1 blanking, S2 heating, S3 die forging, S4 edge cutting, S5 post-forging treatment, wherein,
(1) the trimming correction composite die increases the deformation compensation amount through the punch, the compensation amount is +/-0.3 mm, the straightness of a long shaft is ensured to be within 0.6mm, the position degree is ensured to be within 1mm,
wherein, compound mould structure is rectified in side cut of stainless steel oil rail forging includes:
an upper die component is arranged on the lower die,
the upper die assembly comprises a stripper plate, a punch, a discharging elastic piece and a discharging fixing piece, the discharging elastic piece is arranged in the discharging fixing piece,
and a lower die component, wherein the lower die component is provided with a lower die,
the lower die assembly comprises a lower die base core, a floating plate and a lower elastic piece, the lower die base core is fixed on the floating plate, the lower elastic piece is connected below the floating plate, the floating plate is provided with a cooling device, the discharging elastic piece is a discharging spring, the discharging fixing piece is a discharging bolt, and the lower elastic piece is a nitrogen spring.
(2) Trimming by adopting a press, controlling the pressure below 250t, controlling the temperature between 800 ℃ and 900 ℃, controlling the unilateral clearance between the lower die core and the cutting edge of the trimming lower die 03 to be within 0.2mm, placing a long-shaft forge piece hot product with flash in the lower die core during trimming, starting equipment, contacting the long-shaft forge piece hot product with the punch, moving along with the lower die assembly, pushing the product out of the trimming lower die cavity by the return of the equipment after the flash of the long-shaft forge piece hot product is cut, pushing the floating plate to move upwards by a nitrogen spring, and taking out the long-shaft forge piece hot product,
(3) the temperature during forging is 1060-1080 ℃,
(4) the treatment after forging comprises cooling, shot blasting and solid solution in sequence, the cooling mode can be air cooling or water cooling,
(5) the post-forging treatment comprises waste heat quenching, shot blasting and acid pickling passivation in turn,
(6) the cold correction process is not needed when the deformation compensation amount of the punch is increased, otherwise, the cold correction process is needed to be increased,
furthermore, the step of cutting edges needs to use an edge cutting die to carry out hot edge cutting, and the water cooling device cools the lower die core.
Further, the temperature in the trimming step is controlled at 850 ℃.
Further, the temperature in the forging step is controlled to 1070 ℃.
The invention has the beneficial effects that: the invention relates to a stainless steel oil rail forging and a manufacturing process thereof, which mainly and remarkably solve the technical problem that oil leakage occurs at a thin wall part due to uneven wall thickness of an oil rail product (or the problem that oil leakage occurs at the thin wall part due to uneven wall thickness of the oil rail product is solved on the premise of not reducing the existing manufacturing efficiency), and mainly show the following aspects:
1. according to the invention, through the deformation of the product size and the related parameters, the trimming punch and the lower die holder core are directly compensated, and the problem of size out-of-tolerance of the stainless steel long-axis product such as straightness, position and the like is solved through one process;
2. the invention solves the problem of oil leakage at the thin wall caused by uneven wall thickness of the final oil rail product by a new technical means of controlling the straightness and the position of the main pipe of the oil rail forge piece,
3. in order to ensure the optimal values of the straightness and the position degree of the oil rail forging to ensure that oil does not leak from the thin wall, the manufacturing difficulty is greatly increased and the manufactured laughing materials are reduced in the actual manufacturing and production process;
4, the invention provides a manufacturing process method of the oil rail forging piece meeting the requirements of specific straightness and position, namely, a cold correction procedure is added in the existing technical scheme;
5. according to the invention, the existing process device and process parameters are further optimized and combined by the manufacturing process method of the oil rail forging meeting the requirements of specific straightness and position without adding an additional cold correction procedure.
6. According to the invention, the deformation of the stainless steel oil rail is directly compensated to the trimming punch and the lower die base core, and the hot trimming correction is directly realized through one process; the problems of straightness and position size of a long shaft can be solved;
7. the invention can prevent the phenomena of mould dislocation and displacement through the guide pillar and the guide sleeve of the trimming die carrier equipment, further improve the appearance quality of the forge piece and does not need to make related lock catches on the mould;
8. according to the invention, a block material can be directly processed by linear cutting and milling through the punch and the trimming lower die; the lower die base core is directly processed through the processing center, so that the quality of the die can be ensured;
9. the invention directly selects and uses the nitrogen spring according to the pressure of the equipment, completely meets the requirement, and in addition, the nitrogen spring is convenient to install and convenient to maintain.
Drawings
The invention is further illustrated with reference to the following figures and examples.
FIG. 1 is a schematic structural view of an integral stainless steel oil rail;
FIG. 2 is a schematic structural view of a conventional trimming mold;
FIG. 3 is a schematic view of a composite die using trim correction;
FIG. 4 is a schematic view of the assembled structure of the trimming correction composite mold of the present invention;
FIG. 5 is a schematic structural view of a trimming correction composite mold;
FIG. 6 is a schematic illustration of the deformation that occurs during forging of a stainless steel oil rail;
FIG. 7 is a schematic illustration of designing offset amounts for trim punches and lower die cores;
fig. 8 is a flow chart of the manufacturing process of the present invention.
In the figure: 01. the device comprises a stainless steel oil rail, 02, a die holder core, 03, a trimming lower die, 04, a trimming lower die base, 05, a floating plate, 06, a middle template, 07, a nitrogen spring 08, a pressure plate, 09, a lower template, 10, a discharging plate, 100, a cooling device, 11-1 discharging bolts, 11-2 discharging springs, 11 discharging guide pillars, 12 punches, 13 punch holders, 15 upper templates, 14 positioning plates and 100, the cooling device.
Detailed Description
The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic views illustrating only the basic structure of the present invention in a schematic manner, and thus show only the constitution related to the present invention.
Examples
The invention discloses a stainless steel oil rail forging, which comprises a main pipe part and an oil injector seat part, and is characterized in that the straightness and the position of the main pipe part are limited, the straightness of the main pipe part of the forging is not more than 0.6mm, and the position of the main pipe part of the forging is not more than 1 mm.
As shown in fig. 8, a manufacturing process for manufacturing an integral stainless steel oil rail forging comprises the following steps,
s1 blanking, S2 heating, S3 die forging, S4 edge cutting, S5 post-forging treatment, wherein,
(1) the trimming correction composite die increases the deformation compensation amount of +/-0.3 mm through the punch, ensures that the straightness of the long axis is within 0.6mm and the position degree is within 1mm,
wherein, compound mould structure is rectified in side cut of stainless steel oil rail forging includes:
an upper die component is arranged on the lower die,
the upper die assembly comprises a stripper plate, a punch, a discharging elastic piece and a discharging fixed piece, wherein the discharging elastic piece is arranged in the discharging fixed piece,
and a lower die component, wherein the lower die component is provided with a lower die,
the lower die assembly comprises a lower die base core, a floating plate and a lower elastic part, the lower die base core is fixed on the floating plate, the lower elastic part is connected below the floating plate, a cooling device is arranged on the floating plate, the discharging elastic part is a discharging spring, the discharging fixing part is a discharging bolt, and the lower elastic part is a nitrogen spring.
(2) The trimming is carried out by adopting a press, the pressure is controlled below 250t, the temperature is controlled between 800 ℃ and 900 ℃, the unilateral clearance between a lower die core and the cutting edge of the trimming lower die 03 is controlled within 0.2mm, a long-shaft forge piece hot product with flash is placed in a lower die core during trimming, a punch contacts the long-shaft forge piece hot product after equipment is started, the punch moves along with a lower die component, after the flash of the long-shaft forge piece hot product is cut off, the equipment returns, a nitrogen spring pushes a floating plate to move upwards to push the product out of a trimming lower die cavity, and the long-shaft forge piece hot product is taken out,
(3) the temperature during forging is 1060-1080 ℃,
(4) the treatment after forging comprises cooling, shot blasting and solid solution in sequence, the cooling mode can be air cooling or water cooling,
(5) the post-forging treatment comprises waste heat quenching, shot blasting and acid pickling passivation in turn,
(6) the cold correction process is not needed when the deformation compensation amount of the punch is increased, otherwise, the cold correction process is needed to be increased,
in a preferred embodiment, the trimming step requires hot trimming using a trimming die, the lower die core is cooled by a water cooling device, the temperature in the trimming step is controlled at 850 ℃, and the temperature in the forging step is controlled at 1070 ℃.
Meanwhile, the branches of the long-shaft forge piece are easy to deform, so that the position degree is poor, when the lower die core is designed, the gap between the die cavity and the branches is within 0.2mm, and the branches are prevented from deforming when the forge piece is subjected to edge cutting.
During trimming, a hot product with flash is placed in the lower die core 02, the punch 12 contacts the product after the equipment is started and moves downwards along with the lower die, after the flash of the product is cut off, the equipment returns, the nitrogen spring pushes the floating plate 05 to move upwards, the product is ejected out of a trimming lower die cavity, and the product is taken out;
the floating plate 05 is provided with a water cooling device which can cool the lower die core 02, so that the phenomenon that the lower die core 02 is too high in temperature and clamped on the trimming lower die 03 after expansion, and a product cannot be ejected out of a trimming lower die cavity is avoided; meanwhile, the nitrogen spring can be prevented from being damaged due to heat transfer to the nitrogen spring.
The unilateral clearance between the lower die core 02 and the cutting edge of the trimming lower die 03 is controlled within 0.2 mm. The gap is too large, so that residual flash of the trimmed product is not uniform; the clearance is too little, and lower mould core 02 can block at side cut lower mould 03, leads to the product can not ejecting side cut lower model cavity.
In a concrete implementation mode, the trimming and correcting composite die assembly structure of the stainless steel oil rail forging piece comprises a trimming and correcting composite die, and comprises an upper die plate, a positioning plate, a punch seat and a discharging guide pillar which are matched with an upper die assembly and are sequentially arranged, wherein a punch is fixed on the punch seat, and a discharging elastic piece is fixed on the positioning plate through a discharging plate.
The trimming die further comprises trimming lower dies matched with the lower die assembly and sequentially arranged in sequence, a trimming lower die base, a middle template, a pressing plate and a lower template, and the lower elastic piece is fixed on the lower template.
The invention can also adopt the following technical scheme:
1. two sets of dies are designed on the die carrier, the trimming die and the thermal correction (shaping) are adopted, trimming is carried out firstly, then correction is carried out, although the same effect of a product can be achieved, two working steps are required, the operation is relatively complicated, and the efficiency is influenced;
2. the nitrogen spring is controlled by an air cylinder or a hydraulic cylinder and the like, and the cost of the air cylinder and the hydraulic cylinder is higher according to the practical operation feasibility of the product;
in light of the foregoing description of the preferred embodiment of the present invention, many modifications and variations will be apparent to those skilled in the art without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.
Claims (5)
1. The integral stainless steel oil rail forging is characterized in that the straightness of a main pipe part of the forging is not more than 0.6mm, and the position degree is not more than 1 mm.
2. The manufacturing process of the integral stainless steel oil rail forging piece according to claim 1, which comprises the following steps,
s1 blanking, S2 heating, S3 die forging, S4 edge cutting, S5 post-forging treatment, wherein,
(1) adopt side cut to rectify compound mould, wherein, the side cut of stainless steel oil rail forging rectifies compound mould structure includes: the upper die assembly comprises a discharging plate, a punch, a discharging elastic part and a discharging fixing part, the discharging elastic part is placed in the discharging fixing part, the lower die assembly comprises a lower die base core, a floating plate and a lower elastic part, the lower die base core is fixed on the floating plate, the lower elastic part is connected below the floating plate,
the deformation compensation amount is increased by the punch head, and the compensation amount is +/-0.3 mm
(2) Trimming by adopting a press, controlling the pressure below 250t, controlling the temperature between 800 ℃ and 900 ℃, controlling the unilateral clearance between the lower die core and the cutting edge of the trimming lower die 03 to be within 0.2mm, placing a long-shaft forge piece hot product with flash in the lower die core during trimming, starting equipment, contacting the long-shaft forge piece hot product with the punch, moving along with the lower die assembly, pushing the product out of the trimming lower die cavity by the return of the equipment after the flash of the long-shaft forge piece hot product is cut, pushing the floating plate to move upwards by a nitrogen spring, and taking out the long-shaft forge piece hot product,
(3) the temperature during forging is 1060-1080 ℃,
(4) the treatment after forging comprises cooling, shot blasting and solid solution in sequence, the cooling mode can be air cooling or water cooling,
(5) the post-forging treatment comprises waste heat quenching, shot blasting and acid pickling passivation in turn,
(6) the cold correction process is not needed when the deformation compensation amount of the punch is increased, otherwise, the cold correction process is needed to be increased,
furthermore, the step of cutting edges needs to use an edge cutting die to carry out hot edge cutting, and the water cooling device cools the lower die core.
3. The process of claim 2, wherein the temperature during the trimming step is controlled at 850 ℃.
4. The process of claim 2, wherein the temperature in the forging step is controlled at 1070 ℃.
5. The manufacturing process for manufacturing the integral stainless steel oil rail forging piece according to claim 2, wherein a cooling device is arranged on the floating plate, the discharging elastic piece is a discharging spring, the discharging fixing piece is a discharging bolt, and the lower elastic piece is a nitrogen spring.
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| CN202010454531.3A CN111590004B (en) | 2020-05-26 | 2020-05-26 | Manufacturing process for manufacturing integral stainless steel oil rail forging |
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|---|---|
| CN111590004B (en) | 2022-01-11 |
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Address after: 213164 No.26 Longyu West Road, Wujin high tech Zone, Changzhou City, Jiangsu Province Applicant after: Jiangsu Longcheng Precision Forging Group Co.,Ltd. Address before: 213164 No.26 Longyu West Road, Wujin high tech Zone, Changzhou City, Jiangsu Province Applicant before: JIANGSU LONGCHENG PRECISION FORGING Co.,Ltd. |
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