Two-stage controlled cooling heat treatment system for processing forged steel piston skirt

Abstract

The utility model relates to a two -segmented control cold heat treatment system for forged steel piston skirt processing relates to forging processing technical field. Including the conveying system that is erected with conveying wheel, conveying chain on the body and the control cold heat treatment system that is constituted with fast cooling channel, slow cooling channel, whole control cold heat treatment system divides into two sections, first section is fast cooling area, second section is slow cooling area, and is equipped with one section open space between first section and second section. The utility model discloses two -segmented control cold heat treatment system to the heat treatment of non -tempered steel forging product can realize self -adaptation adjustment, just to three section temperature detection parameter is clear, and the production process does not need manual adjustment and intervention, and also does not have the pre -trial heat treatment process. The utility model discloses two -segmented control cold heat treatment system can realize the self -adaptation adjustment of cooling speed in a certain range, and the control cold heat treatment process is stable. Blow cold simultaneously up and down, avoid uneven cooling speed, cause product hardness and metallographic uneven phenomenon.

Description

Technical Field

[0001] This utility model relates to the field of forging processing technology, specifically to a two-stage controlled cooling heat treatment system for processing forged steel piston skirts. Background Technology

[0002] Forged steel piston skirts made of non-quenched and tempered steel require controlled cooling heat treatment after forging. However, conventional heat treatment equipment / systems are designed with different process parameters set according to the product. Heat treatment equipment must have timely adjustments and trial heat treatment verification processes to handle different products. When the number of products to be heat-treated is small, adjustments and revisions can be made manually. However, when the number of products to be heat-treated is very large, the production adjustment and verification cycle becomes longer, which seriously affects production efficiency and cannot guarantee the stability of the heat treatment effect for each batch.

[0003] In view of this, the present invention is mainly aimed at enabling heat treatment equipment to automatically adjust to the heat treatment requirements based on the condition of the front-end products during mass production of multiple varieties and batches of products. This avoids the very time-consuming adjustment and testing process of conventional heat treatment in the early stage, and improves the efficiency of controlled cooling heat treatment of multiple varieties and batches of products on the same production line. Utility Model Content

[0004] The purpose of this invention is to propose a two-stage controlled cooling heat treatment system for processing forged steel piston skirts, which can achieve adaptive heat treatment adjustment for non-quenched and tempered steel piston products.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] A two-stage controlled cooling heat treatment system for processing forged steel piston skirts includes a conveying system consisting of conveying wheels and conveying chains mounted on the machine body, and a controlled cooling heat treatment system consisting of a fast cooling channel and a slow cooling channel. The entire controlled cooling heat treatment system is divided into two stages: the first stage is a fast cooling zone, the second stage is a slow cooling zone, and an open space is provided between the first stage and the second stage.

[0007] As a preferred technical solution of this utility model, the two-stage controlled cooling heat treatment system for machining forged steel piston skirts has the following structure:

[0008] Above the inlet of the rapid cooling channel is a first temperature field thermometer for measuring the temperature of the inlet forging. Inside the rapid cooling channel, an upper air outlet and a lower air outlet are respectively located above the inlet and below the outlet, staggered from each other. The airflow of the air outlets is controlled by a first variable frequency motor fan. Above the corresponding position of the lower air outlet is a hot air collection outlet. A cylinder and a connected ejection device are also installed between the first temperature field thermometer and the rapid cooling channel.

[0009] Chain-type curtains are designed at the exit end of the fast cooling aisle, the entrance end and the exit end of the slow cooling aisle.

[0010] The slow cooling channel is divided into a front section and a rear section. The front section has two rows of chain-link curtains at its entrance, and a second temperature field thermometer is installed to measure the temperature of the inlet forgings. The rear section has a thermocouple sensor to monitor the temperature of the channel atmosphere. The rear section of the fast cooling channel also has a row of heat-absorbing air ducts, the airflow of which is controlled by a second variable frequency motor fan. The exit end of the slow cooling channel is equipped with a third temperature field thermometer to measure the temperature of the outlet forgings.

[0011] The machine body has a variable frequency conveyor chain motor underneath, which controls the running speed of the conveyor chain; an oxide scale collection tank is set under the conveyor chain.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0013] 1. The two-stage controlled cooling heat treatment system of this utility model can achieve adaptive adjustment of heat treatment for non-quenched and tempered steel forgings. As long as the temperature detection parameters of the three stages are clear, no manual adjustment or intervention is required during the production process, and there is no preliminary heat treatment process.

[0014] 2. The two-stage controlled cooling heat treatment system of this utility model can achieve adaptive adjustment of cooling rate within a certain range, and blow cooling from the top and bottom at the same time to avoid uneven cooling rate, which would cause uneven hardness and metallographic phenomenon in the product.

[0015] 3. The two-stage controlled cooling heat treatment system of this utility model is automatically fine-tuned by cylinders or variable frequency motors according to the temperature signal from the front end throughout the entire operation process, and the controlled cooling heat treatment process is stable. Attached Figure Description

[0016] Figure 1 A schematic diagram of a two-stage controlled cooling heat treatment system for machining forged steel piston skirts.

[0017] Figure 2 for Figure 1 G-direction view.

[0018] Figure 3 for Figure 1 View from the center F direction.

[0019] Figure 4 A flowchart of the two-stage controlled cooling heat treatment system for machining forged steel piston skirts.

[0020] The meanings of the reference numerals in the figure are as follows:

[0021] 1-First temperature field thermometer, 2-Extraction device, 3-Cylinder, 4-Upper air outlet, 5-First variable frequency motor fan, 6-Lower air outlet, 7-Hot air collection outlet, 8-Second temperature field thermometer, 9-Heat absorption duct, 10-Thermocouple sensor, 11-Third temperature field thermometer, 12-Conveyor wheel, 13-Variable frequency conveyor chain motor, 14-Second variable frequency motor fan, 15-Conveyor chain 1, 16-Machine body, 17-Oxide scale collection tank, 18-Chain door curtain, 19-Rapid cooling channel, 20-Slow cooling channel. Detailed Implementation

[0022] The present invention will be further described in detail below with reference to the embodiments and accompanying drawings.

[0023] Please see Figure 1-3 As shown, a conveying system consisting of a conveyor wheel 12 and a conveyor chain 15 is mounted on the body 16, as well as a controlled cooling heat treatment system consisting of a fast cooling channel 19 and a slow cooling channel 20. The entire controlled cooling heat treatment system is divided into two sections: the first section is the fast cooling zone, and the second section is the slow cooling zone. An open space is provided between the first section and the second section.

[0024] For the first section, a first temperature field thermometer 1 is installed above the inlet to measure the temperature of the inlet forging (forged steel piston skirt). Simultaneously, a cylinder 3 and a push-out device 2 connected to it are added between the first temperature field thermometer 1 and the rapid cooling channel 19. When the forging temperature is <950℃, it exits the controlled cooling heat treatment system via the push-out device 2. When the forging temperature is ≥950℃, it continues to enter the rapid cooling channel 19 along with the inlet conveyor chain.

[0025] The upper side of the inlet end and the lower side of the outlet end of the rapid cooling aisle 19 are respectively provided with an upper air outlet 4 and a lower air outlet 6. The upper and lower air outlets are staggered, and the air volume of the air outlets is controlled by a first variable frequency motor fan 5. In addition, a hot air collection outlet 7 is provided above the corresponding position of the lower air outlet 6.

[0026] After leaving the rapid cooling channel 19, the forging passes through the open space between the first and second sections, and then enters the second slow cooling zone. The slow cooling channel 20 in the slow cooling zone is divided into a front half and a rear half. The entrance of the front half has two rows of chain-type curtains, and a second temperature field thermometer 8 is installed to measure the temperature of the forging at the entrance. The rear half is equipped with a thermocouple sensor 10 for monitoring the temperature of the channel atmosphere. The rear half of the slow cooling channel is also equipped with a row of heat-absorbing air ducts 9, and the airflow of the ducts is controlled by a second variable frequency motor fan 14.

[0027] Chain-type curtains 18 are designed at the outlet of the fast cooling aisle 19, the inlet and outlet of the slow cooling aisle 20.

[0028] The outlet end of the slow cooling channel 20 is equipped with a third temperature field thermometer 11 for measuring the temperature of the exit forging.

[0029] A variable frequency conveyor chain motor 13 is located at the bottom of the machine body to control the running speed of the conveyor chain. In addition, an oxide scale collection tank 17 is set below the conveyor chain.

[0030] Please see Figure 4 As shown, this utility model discloses a two-stage controlled cooling heat treatment system for processing forged steel piston skirts. The two stages are designed to ensure the achievement of two key heat treatment processes: rapid cooling and slow cooling. The first stage is the rapid cooling zone, which reduces the forging temperature from ≥950℃ to 700℃; the second stage is the slow cooling zone, which reduces the forging temperature from 700℃ to 450℃.

[0031] When the forgings on the line pass through the first section of the controlled cooling conveyor chain, the temperature of the highest point of the forging is identified and measured by the first temperature field thermometer 1 at the first section inlet, and automatically recorded. Ultra-low temperature parts (below 950℃) are pushed out by the ejection device 2 of the cylinder 3 in front of the first section inlet.

[0032] The hot forging enters the rapid cooling channel 19, first passing through the upper air vent 4 for air cooling, and then through the lower air vent 6 for air cooling. The hot air collection outlet 7 above the lower air vent 6 can quickly collect the hot air generated in the first stage. The simultaneous blowing of air from the upper and lower air vents can avoid the "yin-yang" situation caused by the different cooling rates of the upper and lower surfaces of the piston skirt forging during mold parting. The chain-type curtain 18 at the outlet of the first stage is to prevent the hot air from the first stage from flowing along the conveyor chain and entering the second stage, thus affecting the slow cooling effect of the second stage.

[0033] An open space is designed between the first and second sections, mainly to ensure that the forging has a buffer zone after rapid cooling, allowing it to be pre-cooled before entering the slow cooling zone.

[0034] When the forging enters the second slow cooling zone, the temperature of the highest point of the forging is identified and measured by the second temperature field thermometer 8 at the inlet. The temperature information is then transmitted to the first variable frequency motor fan 5 in the first section, which controls the air volume of the upper and lower air outlets. The variable frequency fan automatically adjusts its corresponding operating frequency according to the transmitted temperature signal, controls the fan speed, and realizes the air volume control of the upper and lower air outlets on the first section's fast cooling channel, thereby achieving stable fast cooling treatment of the piston skirt forging in the first section.

[0035] When the forging enters the latter half of the slow cooling zone, the thermocouple sensor 10, used to monitor the ambient temperature of the channel, collects the ambient temperature and transmits the temperature information to the second variable frequency motor fan 14, which controls the airflow of the heat absorption duct 9. The variable frequency motor fan controls the airflow in the heat absorption duct 9 in the latter half of the slow cooling zone, thereby achieving stable control of the ambient temperature in the latter half of the slow cooling zone.

[0036] The forging exits from the slow cooling zone and is monitored and measured by the third temperature field thermometer 11 at the exit position to obtain the highest temperature of the forging temperature field. The temperature information is then transmitted to the variable frequency conveyor chain motor 13 below the controlled cooling channel, thereby controlling the speed of the entire controlled cooling line conveyor chain and realizing adaptive adjustment and control of the exit forging temperature.

[0037] This utility model features a two-stage temperature control design, integrating three-node temperature detection and the different adjustment responses of the inverter motor / cylinder to the three-node monitored temperatures, to achieve adaptive heat treatment adjustment for non-quenched and tempered steel piston products.

[0038] The above content is merely an example and illustration of the concept of this utility model. Those skilled in the art can make various modifications or additions to the specific embodiments described or use similar methods to replace them, as long as they do not deviate from the concept of the utility model or exceed the scope defined in the claims, they should all fall within the protection scope of this utility model.

Claims

1. A two-stage controlled cooling heat treatment system for machining forged steel piston skirts, characterized in that, It includes a conveying system consisting of conveyor wheels and conveyor chains mounted on the machine body, and a controlled cooling heat treatment system consisting of a fast cooling channel and a slow cooling channel. The entire controlled cooling heat treatment system is divided into two sections: the first section is the fast cooling zone, and the second section is the slow cooling zone. There is an open space between the first section and the second section.

2. The two-stage controlled cooling heat treatment system for machining forged steel piston skirts as described in claim 1, characterized in that, Above the entrance of the rapid cooling channel is a first temperature field thermometer for measuring the temperature of the inlet forging; an upper air outlet and a lower air outlet are respectively provided on the upper side of the entrance end and the lower side of the exit end inside the rapid cooling channel, the upper air outlet and the lower air outlet are staggered, and the air volume of the air outlet is controlled by a first variable frequency motor fan.

3. The two-stage controlled cooling heat treatment system for machining forged steel piston skirts as described in claim 2, characterized in that, A hot air collection outlet is provided above the corresponding position of the downward air outlet.

4. The two-stage controlled cooling heat treatment system for machining forged steel piston skirts as described in claim 2, characterized in that, A cylinder and a push-out device connected to it are also added between the first temperature field thermometer and the rapid cooling channel.

5. The two-stage controlled cooling heat treatment system for machining forged steel piston skirts as described in claim 2, characterized in that, Chain-type curtains are designed at the exit end of the fast cooling aisle, the entrance end and the exit end of the slow cooling aisle.

6. The two-stage controlled cooling heat treatment system for machining forged steel piston skirts as described in claim 2, characterized in that, The slow cooling channel is divided into a front section and a rear section. The entrance of the front section has two rows of chain-type curtains and a second temperature field thermometer for measuring the temperature of the forging at the entrance. The rear section is equipped with a thermocouple sensor for monitoring the temperature of the channel atmosphere. The rear section of the fast cooling channel is also equipped with a row of heat-absorbing air ducts, and the air volume of the air ducts is controlled by a second variable frequency motor fan.

7. The two-stage controlled cooling heat treatment system for machining forged steel piston skirts as described in claim 6, characterized in that, The outlet end of the slow cooling channel is equipped with a third temperature field thermometer for measuring the temperature of the exit forging.

8. The two-stage controlled cooling heat treatment system for machining forged steel piston skirts as described in claim 6, characterized in that, There is a variable frequency conveyor chain motor under the machine body, which controls the running speed of the conveyor chain.

9. The two-stage controlled cooling heat treatment system for machining forged steel piston skirts as described in claim 1, characterized in that, An oxide scale collection tank is provided below the conveyor chain.

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