A powder metallurgy manufacturing method for a manual transmission synchronizer sleeve

Abstract

The invention relates to the technical field of powder metallurgy, and discloses a powder metallurgy manufacturing method for a manual transmission synchronizer gear sleeve, comprising: step S1: using a first movement stroke to push a powder distributor forward so that a powder spreading area covers a cavity, step S2: using a second movement stroke to pull the powder distributor backward so that the powder spreading area is separated from the cavity, and step S3: a pressing driver at the bottom of the cavity uses a third movement stroke to push a punch so that the punch moves toward the powder in the cavity; the invention improves the powder stamping process steps and the powder spreading direction, properly solves the powder belt problem and is not affected by the service life, and the surface of the pressed powder body after being produced is clean and does not require secondary cleaning, and can be combined with conveying and continuous sintering equipment to realize automatic processing, and since there is no residual loose powder on the surface of the sintered body after sintering, the surface is smoother than that of the uncleaned pressed powder body, which is convenient for subsequent processing.

Description

Technical Field

[0001] The invention relates to the technical field of powder metallurgy, in particular to a powder metallurgy manufacturing method for a manual transmission synchronizer gear sleeve. Background Art

[0002] The principle of powder metallurgy is to continuously press powder into a mold through a mold, and then sinter, grind, and fine-tune the molded part to obtain the target part. Since powder molding mainly uses molds for rapid processing, the processing method is to use a punch and a die. A powder distributor slides on the top of the die, and the bottom of the powder bin of the powder distributor is an open structure. When the powder bin moves to the cavity, the powder fills the cavity. At this time, the powder distributor retreats, exposing the cavity to the outside, and the vertical punch descends to press the powder into a part in the cavity. The ejection effect or the overall sinking of the mold promotes the relative movement of the ejection mechanism and the cavity, so that the workpiece is ejected from the cavity.

[0003] See also Figure 4 Due to the high-frequency sliding, the sliding sealing between the powder distributor and the mold surface is reduced. When the powder distributor passes through the cavity surface, a residual powder belt will be formed on the surface of the mold. When the powder distributor moves next time, the workpiece will be pushed out from the residual powder belt. At this time, a large amount of metal powder will adhere to the surface of the workpiece. This type of metal powder is easy to form bumps on the surface during the sintering process, which affects the polishing. Therefore, the powder needs to be removed before use, and the removed powder needs to be sent back to the inside of the stamping equipment. Therefore, if efficient cleaning and recycling are required, the generation of powder belts needs to be avoided. Summary of the invention

[0004] The object of the present invention is to provide a powder metallurgy manufacturing method for a manual transmission synchronizer sleeve to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A powder metallurgy manufacturing method for a manual transmission synchronizer sleeve, comprising:

[0007] Step S1: using a first motion stroke to push the powder distributor forward so that the powder spreading area covers the cavity, so that the powder covers the cavity;

[0008] Step S2: The powder distributor is pulled back by the second movement stroke to separate the powder spreading area from the mold cavity, and the residual powder is pushed to the powder spreading area by the pressing area in contact with the mold surface, so that the powder remains in the mold cavity, and the mold cavity is closed by the pressing surface;

[0009] Step S3: the pressing driver at the bottom of the cavity pushes the punch through the third motion stroke, so that the punch moves toward the powder in the cavity, and under the action of the pressing and sealing, a pressed powder body is formed in the cavity;

[0010] Step S4: the pressing driver at the bottom of the cavity uses the fourth movement stroke to retract the punch, so that the punch moves away from the powder in the cavity, releasing the pressure of the pressed powder on the pressing surface;

[0011] Step S5: Using the fifth movement stroke to pull the powder distributor backward so that the push-clearing area is located above the open end of the top of the cavity, and the residual powder is sucked out by the suction device inside the push-clearing area;

[0012] Step S6: the pressing driver at the bottom of the cavity pushes the punch through the sixth motion stroke to eject the pressed powder from the cavity, and continues to remove powder from the pressed powder by the suction process of step S5;

[0013] Step S7: The seventh movement stroke is used to push the powder distributor, and the pressed powder body is pushed to the outside along the side wall of the push-clearing area. The first movement stroke is used to make the powder distributor reach the powder spreading position of step S1, and the pressed powder body leaves the push-clearing area, and the suction process of step S5 continues to suck and remove powder from the pressed powder body.

[0014] As a further solution of the present invention: step S4 is removed, the pushing punch in step S6 is replaced with a ejector, and step S3 is replaced with step S31. Step S31: the punch moves from top to bottom through the profiling hole into the cavity, and the eighth reciprocating motion stroke is adopted to make the punch press down and rise, and the punch is separated from the profiling hole.

[0015] As a further solution of the present invention: the ejector in step S6 is replaced with a mold body, and the pressing drive is replaced with a linear drive that drives the entire mold cavity to move up and down.

[0016] As a further solution of the present invention: when the punch is pushed to the limit position in step S6, the top surface of the punch is higher than the bottom surface of the mold.

[0017] As a further solution of the present invention: the negative pressure suction device in the push cleaning area is always in an open state.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] The present invention improves the powder stamping molding process steps and the powder spreading direction, properly solves the powder band problem and is not affected by the service life. The surface of the pressed powder body produced is clean and does not require secondary cleaning. It can be combined with conveying and continuous sintering equipment to realize automated processing. Moreover, since there is no residual loose powder on the surface of the sintered body after sintering, the surface is smoother than that of the uncleaned pressed powder body, which is convenient for subsequent processing. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0021] Figure 1 A diagram of the first part of the top-pressing forming method in a powder metallurgy manufacturing method for a manual transmission synchronizer sleeve;

[0022] Figure 2 A diagram of the second part of the top-pressing forming method in a powder metallurgy manufacturing method for a manual transmission synchronizer sleeve;

[0023] Figure 3 A schematic diagram of the steps of a downward pressure type difference method in a powder metallurgy manufacturing method of a manual transmission synchronizer sleeve;

[0024] Figure 4 It is a schematic diagram of existing powder molding;

[0025] Figure 5 A schematic diagram of the partitioning of top-pressing forming in a powder metallurgy manufacturing method for a manual transmission synchronizer sleeve;

[0026] Figure 6 The present invention is a schematic diagram of the partitioning of the downward pressing type forming in the powder metallurgy manufacturing method of the manual transmission synchronizer sleeve. DETAILED DESCRIPTION

[0027] See also Figure 1-Figure 6 : Example 1 Top pressing processing method:

[0028] In this embodiment, the entire powder distributor includes three linearly distributed zones, which correspond to the push-clearing zone, the pressing zone and the powder spreading zone, respectively. The powder spreading zone is consistent with the existing powder distributor, except that the pressing zone and the push-clearing zone are added. The pressing zone is a solid structure, and the punching mechanism is arranged at the bottom. The entire powder distributor is provided with a stable sliding limit structure. The punching mechanism is pressed from bottom to top, so that the pressing surface is stressed, and the powder is formed below the pressing surface. The ends and bottom of the push-clearing zone are both open structures, and the top surface of the inner wall of the push-clearing zone is provided with an exhaust mechanism. The exhaust mechanism acts in the push-clearing zone, so that the powder is sucked into the storage bin through the pipeline and transported to the powder spreading bin.

[0029] In this embodiment, step S1: use the first motion stroke to push the powder distributor forward so that the powder spreading area covers the cavity, so that the powder covers the cavity; this process is consistent with the existing powder distributor, and the powder spreading area covers the cavity, so that the powder falls into the cavity under the action of gravity. During this period, the mold can be shaken to fully fill the cavity with powder.

[0030] In this embodiment, step S2: use the second movement stroke to pull the powder distributor backward to separate the powder spreading area from the cavity, and push the remaining powder to the powder spreading area by the pressing area in contact with the mold surface, so that the powder remains in the cavity and the cavity is closed by the pressing surface.

[0031] In this embodiment, the second motion stroke controls the pressing area to cover the surface of the cavity. When the edge of the pressing area moves, the residual powder on the surface of the cavity is scraped flat. Residue may appear during the whole process. The residual powder is located at Figure 1 Inside the push cleaning area during the second movement stroke, the negative pressure suction equipment in the push cleaning area is always in the open state, and the powder remaining on the mold surface is cleaned by the push cleaning area.

[0032] In this embodiment, step S3: the pressing driver at the bottom of the cavity pushes the punch using the third motion stroke, so that the punch moves toward the powder in the cavity, and under the action of the pressing and sealing, a pressed powder body is formed in the cavity.

[0033] In this embodiment, the third movement stroke is that the pressing driver is lifted upward, and the pressed powder body is formed in the mold cavity due to the sealing effect of the pressing area.

[0034] In this embodiment, step S4: the pressing driver at the bottom of the cavity uses the fourth movement stroke to retract the punch, so that the punch moves away from the powder in the cavity, releasing the pressure of the pressed powder body on the pressing surface, and step S5: uses the fifth movement stroke to retract the powder distributor so that the push-clearing area is located above the open end of the top of the cavity, and the residual powder is sucked away by the suction equipment inside the push-clearing area.

[0035] In this embodiment, since the pressed powder body is formed by the sealing effect of the pressing area in step S3, there is pressure between the pressed powder body and the pressing area. Under the action of pressure, the friction between the pressed powder body and the pressing area increases. At this time, the powder distributor moves, which is easy to cause surface damage to the pressed powder body. Therefore, the fourth movement stroke retreats to separate the pressed powder body from the pressing area, or the punch cannot exert pressure on the pressed powder body, thereby making it easier to separate the pressing area from the pressed powder body, and the weight of the pressed powder body will also promote separation from the pressing surface.

[0036] In this embodiment, step S6: the pressing driver at the bottom of the cavity pushes the punch using the sixth movement stroke to eject the pressed powder body from the cavity, and continues to remove powder from the pressed powder body by the suction process of step S5.

[0037] In this embodiment, step S6: the pressing driver at the bottom of the cavity uses the sixth movement stroke to push the punch to eject the pressed powder body. At this time, the pressed powder body is located in the push-clearing area, thereby clearing the loose powder on the surface of the workpiece.

[0038] In this embodiment, step S7: the seventh movement stroke is used to push the powder distributor, and the pressed powder body is pushed to the outside along the side wall of the push-clearing area. The first movement stroke is used to make the powder distributor reach the powder spreading position of step S1, and the pressed powder body leaves the push-clearing area, and the suction process of step S5 continues to suck and remove powder from the pressed powder body.

[0039] In this embodiment, the seventh motion stroke is used to push the side wall of the clearing area to push the pressed powder to the outside, and step S1 is repeated. At this time, the surface of the pressed powder obtained is free of impurities, and the distance between the extracted powder and the powder bin is closest, which reduces the conveying stroke and combines the cleaning and stamping processes into one.

[0040] Embodiment 2 Downward pressure processing method:

[0041] In this embodiment, step S1: using the first motion stroke to push the powder distributor forward so that the powder spreading area covers the inside of the mold cavity, so that the powder covers the mold cavity.

[0042] In this embodiment, step S2: use the second movement stroke to pull the powder distributor backward to separate the powder spreading area from the cavity, and push the residual powder to the powder spreading area by the inner wall of the pressing hole in contact with the mold surface, so that the powder remains in the cavity and the cavity is closed by the pressing surface.

[0043] In this embodiment, step S31: the punch moves from top to bottom through the pressing hole into the mold cavity, and the eighth reciprocating motion stroke is used to make the punch press down and rise, and the punch is separated from the pressing hole to obtain the pressed powder body.

[0044] In this embodiment, the top pressure type used in embodiment 1 is suitable for stamping small parts, and the required stamping pressure is small. For workpieces with high pressure requirements, it is more convenient to accept pressure by using the bottom pressure type. Therefore, a press hole is set, and the processing method of the press hole is relative to embodiment 1, step 3 is replaced by step 31, step 4 is removed, the upper stamping punch is lowered into the cavity for forming, and after the end, the lower ejection mechanism is lifted, and steps S5 and S6 can be executed.

[0045] In this embodiment, step S5: the powder distributor is pulled backward by the fifth movement stroke so that the push-clearing area is located above the open end of the top of the cavity, and the residual powder is sucked by the suction device inside the push-clearing area.

[0046] In this embodiment, step S6: the pressing driver at the bottom of the cavity pushes the punch using the sixth movement stroke to eject the pressed powder from the cavity, and continues to remove powder from the pressed powder by the suction process of step S5;

[0047] In this embodiment, step S7: the seventh movement stroke is used to push the powder distributor, and the pressed powder body is pushed to the outside along the side wall of the push-clearing area. The first movement stroke is used to make the powder distributor reach the powder spreading position of step S1, and the pressed powder body leaves the push-clearing area, and the suction process of step S5 continues to suck and remove powder from the pressed powder body.

[0048] In this embodiment, the ejector in step S6 is replaced with the mold body, and the pressing drive is replaced with a linear drive that drives the mold cavity to move up and down as a whole. If the ejector mechanism cannot bear the pressure demand, the ejector mechanism is used as a fixed guide column, and the mold is lowered as a whole, so that the ejector mechanism and the mold are relatively displaced, thereby ejecting the workpiece.

[0049] In this embodiment, when the punch is pushed to the limit position in S6, the top surface of the punch is higher than the bottom surface of the mold. The purpose of being higher than the bottom surface of the mold is to clean the side wall of the punch or the ejector pin to avoid dust adhesion.

[0050] What is described above is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A powder metallurgy manufacturing method for a manual transmission synchronizer sleeve, characterized in that: include: Step S1: using a first motion stroke to push the powder distributor forward so that the powder spreading area covers the cavity, so that the powder covers the cavity; Step S2: Using the second movement stroke to pull the powder distributor backward to separate the powder spreading area from the mold cavity, and the pressing area moves in contact with the mold surface to push the remaining powder to the powder spreading area, so that the powder remains in the mold cavity, and the mold cavity is closed by the pressing area; Step S3: the pressing driver at the bottom of the cavity pushes the punch through the third motion stroke, so that the punch moves toward the powder in the cavity, and under the closed effect of the pressing area, a pressed powder body is formed in the cavity; Step S4: the pressing driver at the bottom of the cavity uses the fourth movement stroke to retract the punch, so that the punch moves away from the powder in the cavity, releasing the pressure of the pressed powder on the pressing area; Step S5: Using the fifth movement stroke to pull the powder distributor backward so that the push-clearing area is located above the open end of the top of the cavity, and the residual powder is sucked out by the suction device inside the push-clearing area; Step S6: the pressing driver at the bottom of the cavity pushes the punch with the sixth movement stroke to eject the pressed powder from the cavity, so that the pressed powder is located inside the push-out area, and the suction device in step S5 continues to suck and remove powder from the pressed powder; Step S7: The seventh motion stroke is used to push the powder distributor, and the compacted powder is pushed to the outside along the side wall of the push-clearing zone. The first motion stroke is used to make the powder distributor reach the powder spreading position of step S1, and the compacted powder leaves the push-clearing zone.

2. The powder metallurgy manufacturing method of a manual transmission synchronizer sleeve according to claim 1, characterized in that: When the punch is pushed to the limit position in step S6, the top surface of the punch is higher than the mold surface.

3. The powder metallurgy manufacturing method of a manual transmission synchronizer sleeve according to claim 1, characterized in that: The suction equipment in the push cleaning area is always switched on.

4. A powder metallurgy manufacturing method for a manual transmission synchronizer sleeve, characterized in that: include: Step S1: using a first motion stroke to push the powder distributor forward so that the powder spreading area covers the cavity, so that the powder covers the cavity; Step S2: Using the second movement stroke to pull the powder distributor backward to separate the powder spreading area from the mold cavity, the powder remains in the mold cavity, and the pressing hole corresponds to the mold cavity; Step S3: the punch moves from top to bottom through the pressing hole into the cavity, and uses the eighth reciprocating motion stroke to make the punch press down and rise to obtain a pressed powder body; Step S4: Using the fifth movement stroke to pull the powder distributor backward so that the push-clearing area is located above the open end of the top of the cavity, and the residual powder is sucked out by the suction device inside the push-clearing area; Step S5: the pressing driver at the bottom of the cavity pushes the ejector using the sixth motion stroke to eject the pressed powder from the cavity, so that the pressed powder is located inside the push-out area, and the suction device in step S4 continues to suck and remove powder from the pressed powder; Step S6: The seventh motion stroke is used to push the powder distributor, and the compacted powder is pushed to the outside along the side wall of the push-clearing zone. The first motion stroke is used to make the powder distributor reach the powder spreading position of step S1, and the compacted powder leaves the push-clearing zone.

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