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CN-120038330-B - Production process of high-strength powder metallurgy automobile engine gear

CN120038330BCN 120038330 BCN120038330 BCN 120038330BCN-120038330-B

Abstract

The invention relates to the technical field of production of high-strength powder metallurgy automobile engine gears, and discloses a production process of high-strength powder metallurgy automobile engine gears, which comprises the steps of conveying metal powder into storage equipment through a transparent conveying pipeline; in the metal powder transmission process, the position of the filling equipment is recorded as an initial position, after the metal powder transmission is completed, the metal powder in the filling equipment is filled into the die, after the metal powder is filled, the filling equipment is vibrated, if the metal powder in the filling equipment reaches a filling standard, the filling equipment is moved to the initial position and the powder in the die is pressed down to obtain a molded gear-shaped part, if the metal powder in the filling equipment does not reach the filling standard, a powder supplementing area in the die is obtained, and the powder supplementing area is subjected to powder supplementing.

Inventors

  • ZHANG LIBO

Assignees

  • 宁波金宁粉末冶金制品有限公司

Dates

Publication Date
20260508
Application Date
20250226

Claims (7)

  1. 1. A production process of a high-strength powder metallurgy automobile engine gear is characterized by comprising the following steps: transmitting the metal powder into storage equipment through a transparent transmission pipeline; the transparent transmission pipeline and the storage equipment form filling equipment; in the metal powder conveying process, the position of the filling equipment is recorded as an initial position; Filling the metal powder in the filling equipment into the mold after the metal powder is conveyed; After the metal powder is filled, vibrating filling equipment, specifically: aiming at the two open ends of the transparent transmission pipeline, the open end close to the storage equipment is marked as a vibration end; Applying uniform vibration on the whole circumference of the vibration end at the same time; acquiring a filling judgment value T; taking the cross section of the junction of the transparent transmission pipeline and the storage equipment as a transmission bottom surface; The volume of the metal powder in the filling device is fixed to be V each time the metal powder is transferred; the volume of metal powder required by single pressing is recorded as V 1 ; after the metal powder with the volume V 1 in the filling equipment is filled into the mould, conveying the metal powder with the volume V 1 into the filling equipment, so that the volume V of the metal powder in the filling equipment after the conveying is finished; After the metal powder with the volume V 1 in the filling equipment is filled into the mould, the metal powder with the volume V-V 1 in the filling equipment is subjected to image acquisition by encircling the transparent transmission pipeline by 360 degrees by taking the central shaft of the transparent transmission pipeline as a rotation shaft; for the acquired image, marking the juncture of the metal powder in the image and the transparent transmission pipeline by an image processing technology; Obtaining the distance between each pixel point at the junction and the transmission bottom surface, and recording the average value of each obtained distance as T; judging whether the metal powder in the filling equipment reaches a filling standard or not according to a filling judging value T for the filling equipment after vibration; if the metal powder in the filling equipment reaches the filling standard, the filling equipment is moved to an initial position and the powder in the die is pressed down to obtain a molded gear-shaped part; if the metal powder in the filling equipment does not reach the filling standard, the metal powder in the die is determined to not meet the compression molding condition; when the metal powder in the die does not meet the compression molding conditions, controlling the filling equipment to move to an initial position, and vibrating the metal powder in the die; Aiming at the metal powder in the die after vibration, acquiring a powder supplementing area in the die; powder replenishment is performed on the powder replenishment area; after the powder replenishment is completed, the filling device is moved to an initial position and the powder in the mold is pressed down, so that a molded gear-like part is obtained.
  2. 2. The process for producing a high-strength powder metallurgy automobile engine gear according to claim 1, wherein after the metal powder is transferred, the metal powder in the filling device is filled into a mold, specifically: Stopping powder transmission after powder transmission is completed; the filling equipment is pushed by the pneumatic rod to move to the position right above the die at a constant speed; The moment when the filling equipment starts to move is recorded as an initial moment; The moment when the filling equipment is contacted with the mould is recorded as the termination moment; Obtaining the time difference between the ending time and the initial time, and marking the time difference as T A ; and after the filling equipment moves to the position right above the die, filling the powder in the filling equipment into the die.
  3. 3. The process for producing the high-strength powder metallurgy automobile engine gear according to claim 1, wherein the step of judging whether the metal powder in the filling equipment reaches a filling standard by the filling equipment after vibration is as follows: image acquisition is carried out by taking the central shaft of the transparent transmission pipeline as a rotating shaft and encircling the transparent transmission pipeline by 360 degrees; for the acquired image, marking the juncture of the metal powder in the image and the transparent transmission pipeline by an image processing technology; obtaining the distance between each pixel point at the junction and the transmission bottom surface, and respectively marking the maximum value and the minimum value of the distance as X MAX and X MIN ; An average of X MAX and X MIN is taken and recorded as X, where x= (X MAX +X MIN )/(2); Comparing the values of X and T; If X is less than or equal to T, the metal powder in the filling equipment is determined to reach the filling standard; If X > T, the metal powder in the filling device is determined to not reach the filling standard.
  4. 4. The process for producing the high-strength powder metallurgy automobile engine gear according to claim 1, wherein the process is characterized in that a powder supplementing area in a die is obtained for metal powder in the die after vibration, specifically: acquiring an image of the mold right above the mold, and recording the image as a supplementary area acquired image; Processing the acquired image of the supplementary region by an image processing technology, and identifying the region where collapse occurs in the die; the area where collapse occurs is denoted as a powder replenishment area; Acquiring a moving direction of the filling equipment from an initial position to a position right above the die, and marking the moving direction as a filling direction; Dividing the inner cavity of the die into 2 spaces with the same volume by a plane perpendicular to the filling direction, and marking the divided spaces as powder supplementing spaces; According to the position relation between the two powder supplementing spaces and the filling equipment, marking the powder supplementing space close to the filling equipment as a first supplementing space, and marking the powder supplementing space far away from the filling equipment as a second supplementing space; and acquiring an image of the transparent transmission pipeline, and judging the distribution type of the metal powder in the transparent transmission pipeline.
  5. 5. The process for producing a high strength powder metallurgy automotive engine gear according to claim 4, wherein the acquiring an image of a transparent transmission pipeline, judging a distribution type of metal powder in the transparent transmission pipeline, further comprises: s1, pushing filling equipment to move along a filling direction; s2, after the filling equipment starts to move, marking the diameter parallel to the filling direction in the diameter of the bottom surface of the transmission as a first diameter, and making a first section perpendicular to the bottom surface of the transmission by the first diameter; s3, acquiring the juncture of the metal powder and the transparent transmission pipeline; S4, two intersection points exist between the juncture and the first section; S5, obtaining the distance between the two intersection points and the transmission bottom surface, and comparing the values of the two distances; S6, marking the corresponding intersection point with a larger value as a first point, and marking the corresponding intersection point with a smaller value as a second point; S7, acquiring the position relation between the first point and the second point, and marking the distribution type of the metal powder in the transparent transmission pipeline as a type of distribution if the first point is farther away from the die relative to the second point; S8, if the first point is closer to the die than the second point, marking the distribution type of the metal powder in the transparent transmission pipeline as second-class distribution; And supplementing the powder in the die according to the distribution type of the metal powder in the clear conveying pipeline and the position of the powder supplementing area.
  6. 6. The process for producing a high-strength powder metallurgy automotive engine gear according to claim 5, wherein the powder in the mold is replenished according to the distribution type of the metal powder in the bright transmission pipeline in combination with the position of the powder replenishment area, specifically: if the distribution type of the metal powder in the transparent transmission pipeline is two-class distribution, pushing the filling equipment to move to the position right above the first supplementing space to supplement the metal powder in the die; If the distribution type of the metal powder in the transparent transmission pipeline is a type of distribution, pushing the filling equipment to move and applying an acceleration to the filling equipment, wherein the applied acceleration is opposite to the filling direction; the acceleration is obtained through a powder distribution adjustment model; in the acceleration applying process, stopping applying the acceleration when the distribution type of the metal powder in the transparent transmission pipeline is changed from one type of distribution to two types of distribution; After the acceleration is applied, the filling equipment is pushed to move to the position right above the die, and the metal powder in the die is replenished.
  7. 7. The process for producing a high-strength powder metallurgy automobile engine gear according to claim 6, wherein the acceleration is obtained by a powder distribution adjustment model, specifically: When the filling device starts to move, acceleration with a direction opposite to the filling direction is applied to the filling device; The moment when the filling equipment starts to move is recorded as the beginning moment; starting with a start time, after which the time separated from the start time by T B is denoted as end time, wherein T B ＜T A ; Acquiring the distribution type of the metal powder in the transmission pipeline in real time; If the distribution type of the metal powder in the transparent transmission pipeline is a type of distribution, increasing the acceleration, and ensuring that the distribution type of the metal powder in the transparent transmission pipeline is changed from the type of distribution to the type of distribution before reaching the end moment; when the distribution type of the metal powder in the transparent transmission pipeline is changed from one type of distribution to two types of distribution, the application of the acceleration is stopped, and the magnitude of the acceleration at the moment is recorded.

Description

Production process of high-strength powder metallurgy automobile engine gear Technical Field The invention relates to the technical field of production of high-strength powder metallurgy automobile engine gears, in particular to a production process of a high-strength powder metallurgy automobile engine gear. Background In the production process of high-strength powder metallurgy automobile engine gears, uniform filling and effective compression molding of metal powder are one of key factors for ensuring product quality, and currently, conventional powder metallurgy processes face a plurality of challenges, such as uneven distribution of metal powder in a die, inaccurate control of filling process and the like, so that the strength and the accuracy of the finally formed gears are difficult to meet the requirements. In the traditional powder metallurgy production process, the filling of metal powder generally depends on manual operation, powder is easily distributed unevenly, the powder quantity of each area is difficult to accurately control, the strength and density of formed parts are inconsistent, and the quality of a final product is further affected, secondly, a large amount of manual labor force is required for manual filling, the labor intensity in the production process is increased, meanwhile, operator fatigue and errors are easily caused by improper operation, so that the production efficiency and stability are affected, furthermore, the precision of manual operation is low, the powder quantity and the filling speed of each filling are difficult to accurately control, powder waste or insufficient filling can be caused, especially in the production of high-strength and precise products, the precision requirement is often not met, the quality of a finished product is not up to standard, meanwhile, the manual operation is easily affected by factors such as the skill, experience and attention of operators, and the like, the consistency in each filling process is poor, and the products of different batches can have large differences, so that stable product quality is difficult to realize. With the development of automation, the metal powder conveying and filling process gradually starts to adopt a simple mechanical device, and although the powder filling effect can be improved to a certain extent by the methods, the uniformity and the precision of filling cannot be accurately controlled, and partial area powder shortage or excessive phenomenon easily occurs, so that the strength of the formed part is unbalanced. The powder is filled in the die, if the powder in the die is less than the required powder amount during the pressing forming due to insufficient filling, the part after the pressing forming can not meet the subsequent processing requirement, but the existing powder metallurgy processing technology can not accurately judge the part, and the metal powder in the die can not be supplemented under the condition of insufficient filling for the first time, so that the subsequent processing technology is influenced, and the powder is wasted. Disclosure of Invention The present invention provides a process for producing a high strength powder metallurgy automotive engine gear to facilitate solving the problems noted in the background art described above. The invention provides a production process of a high-strength powder metallurgy automobile engine gear, which is characterized by comprising the following steps of: transmitting the metal powder into storage equipment through a transparent transmission pipeline; the transparent transmission pipeline and the storage equipment form filling equipment; in the metal powder conveying process, the position of the filling equipment is recorded as an initial position; Filling the metal powder in the filling equipment into the mold after the metal powder is conveyed; After the metal powder is filled, vibrating filling equipment, specifically: aiming at the two open ends of the transparent transmission pipeline, the open end close to the storage equipment is marked as a vibration end; Applying uniform vibration on the whole circumference of the vibration end at the same time; acquiring a filling judgment value T; judging whether the metal powder in the filling equipment reaches a filling standard or not according to a filling judging value T for the filling equipment after vibration; if the metal powder in the filling equipment reaches the filling standard, the filling equipment is moved to an initial position and the powder in the die is pressed down to obtain a molded gear-shaped part; if the metal powder in the filling equipment does not reach the filling standard, the metal powder in the die is determined to not meet the compression molding condition; when the metal powder in the die does not meet the compression molding conditions, controlling the filling equipment to move to an initial position, and vibrating the metal powder in the die; Aiming at the meta