Forming die and powder compacting apparatus for cylinder exhaust port without machining

Abstract

The utility model discloses a kind of forming die and powder pressing equipment of cylinder exhaust port free machining, forming die includes upper punch module;Lower punch module, located the below of the upper punch module, the upper punch module and the lower punch module can be combined die to form die cavity, the lower punch module includes body, and shaft hole forming part and protruding part are set on the body, the body structure is hollow to form the shaft hole forming part, the protruding part is set on the edge of the shaft hole forming part.Powder pressing equipment has applied above forming die.

Description

Technical Field

[0001] This utility model relates to the field of powder metallurgy compressor cylinder parts manufacturing technology, and in particular to a forming mold and powder pressing equipment for cylinder exhaust port that does not require machining. Background Technology

[0002] Powder metallurgy compressor cylinder parts are manufactured using a mixture of metal and non-metal powders as raw materials. They are formed through die pressing, followed by sintering and steam treatment. In traditional processes, after the powder metallurgy compressor cylinder parts are formed using upper punches, lower punches, and various types of mandrel dies, the exhaust port requires subsequent machining. This method has several drawbacks: First, machining generates a large amount of metal scrap, resulting in raw material waste. Second, burrs easily form on the exhaust port edges during machining, requiring additional manual sorting and cleaning, increasing production costs and affecting efficiency. Third, the dimensional accuracy and surface quality of the machined exhaust port are difficult to guarantee, potentially affecting the final performance of the cylinder part. Furthermore, traditional die structures cannot directly form exhaust port shapes that meet requirements, leading to poor product consistency. Utility Model Content

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a forming mold and powder pressing equipment for cylinder exhaust ports that eliminates the need for machining, which has the advantages of reducing subsequent processing steps, avoiding material waste, and improving the forming accuracy and consistency of the exhaust ports.

[0004] In a first aspect, a forming mold for a cylinder exhaust port that requires no machining, according to an embodiment of the present invention, includes: Upward punching module; The lower punch module is located below the upper punch module. The upper punch module and the lower punch module can be closed to form a mold cavity. The lower punch module includes a body, a shaft hole forming part and a protrusion disposed on the body. The body has a hollow structure to form the shaft hole forming part, and the protrusion is disposed on the edge of the shaft hole forming part.

[0005] A forming mold for a cylinder exhaust port that eliminates machining, according to an embodiment of this utility model, has at least the following beneficial effects: This application achieves one-time forming of the exhaust port through an integral mold structure, eliminating subsequent machining steps. The upper punch and lower punch cooperate to form a complete mold cavity, and the exhaust port structure is directly formed through the special structure of the lower punch. The shaft hole forming part formed in the hollow body simultaneously forms the shaft hole structure during the pressing process, avoiding the errors caused by the step-by-step machining of the shaft hole and exhaust port in traditional processes. The protrusion provided on the edge of the shaft hole forming part can directly form the three-dimensional structure of the exhaust port during the pressing process, and the burr problem caused by machining is fundamentally eliminated by replacing cutting processing with mold forming. The integrated design of the protrusion and the shaft hole forming part ensures the positional accuracy between the two and avoids the assembly errors caused by separate processing.

[0006] According to an embodiment of the present invention, a forming mold for a cylinder exhaust port that does not require machining is provided, wherein the protrusion includes a first arc segment and a second arc segment, and the two second arc segments are disposed opposite to each other on both sides of the first arc segment.

[0007] According to an embodiment of the present invention, a forming mold for a cylinder exhaust port that does not require machining is provided, wherein the axis of the second arc segment is parallel to the axis of the first arc segment.

[0008] According to an embodiment of the present invention, a forming mold for a cylinder exhaust port that does not require machining is provided, wherein the first arc segment is inclined and the angle between the axis of the first arc segment and the axis of the main body is 30 degrees to 45 degrees.

[0009] According to an embodiment of the present invention, a forming mold for a cylinder exhaust port that does not require machining is provided, wherein the diameter of the first arc segment is smaller than the diameter of the second arc segment.

[0010] According to an embodiment of the present invention, a forming mold for a cylinder exhaust port that does not require machining is provided at the connection between the first arc segment and the second arc segment, wherein a smooth transition section is provided.

[0011] According to an embodiment of the present invention, a forming mold for a cylinder exhaust port that does not require machining is provided, wherein the radius of the first arc segment is 3.9 mm; And / or, The radius of the second arc segment is 3mm.

[0012] Secondly, according to an embodiment of the present invention, a powder pressing device includes the above-described forming mold.

[0013] A powder pressing device according to an embodiment of the present invention has at least the following beneficial effects: The powder pressing device provided in this application integrates a forming mold with a specific structure, directly forming the exhaust port shape during the pressing process, avoiding subsequent machining. The mold cavity formed by the upper punch and lower punch combination mold, combined with the hollow structure of the shaft hole forming part of the lower punch mold, can simultaneously complete the forming of the cylinder shaft hole and the exhaust port. The protrusion is set at the edge of the shaft hole forming part, and its first arc segment is inclined and the second arc segment on both sides is symmetrical, so that the exhaust port forms a smoothly transitioned irregular curved surface structure during pressing, thereby eliminating the geometric conditions for burr generation. The difference in diameter between the first arc segment and the second arc segment and the smooth transition segment further optimize the stress distribution of the exhaust port forming surface, ensuring uniform material flow during powder pressing and avoiding burr defects caused by local stress concentration.

[0014] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0015] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a schematic diagram of the structure of the punch module body according to an embodiment of the present invention; Figure 2 for Figure 1 Enlarged view of the image marked A.

[0016] Explanation of reference numerals in the attached figures: Body 100; shaft hole forming part 110; protrusion 120; first arc segment 121; second arc segment 122. Detailed Implementation

[0017] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0018] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0019] In the description of a utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If the terms "first" and "second" are used, they are merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly specifying the number of indicated technical features or the order of the indicated technical features.

[0020] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0021] This utility model embodiment provides a forming mold for cylinder exhaust ports that requires no machining, comprising an upper punch assembly and a lower punch assembly. (See reference...) Figure 1 and Figure 2 The lower punch assembly includes a hollow body 100, on which a shaft hole forming part 110 and a protrusion 120 located at its edge are provided. The upper punch assembly and the lower punch assembly are combined to form a closed mold cavity.

[0022] The shaft hole forming part 110 refers to the structure used to form the cylinder shaft hole, which can be directly defined by the geometry of the hollow part of the body 100, and guides the powder to fill and form a precise channel during the pressing process. The protrusion 120 refers to the three-dimensional structure provided on the circumferential edge of the shaft hole forming part 110, which can be implemented by using an arc-shaped or trapezoidal boss structure, and cooperates with the upper punch module to form the spatial shape of the exhaust port during pressing.

[0023] Specifically, after the metal powder is filled into the hollow area of ​​the lower punch die body 100, the upper punch die moves downward to complete the mold closing. During the pressing process, the powder material is simultaneously subjected to vertical pressure and lateral constraint. The hollow structure of the shaft hole forming part 110 allows the powder to form a precise inner wall of the shaft hole, while the fit between the protrusion 120 and the upper punch die cavity forms a three-dimensional structure of the vent at the edge of the shaft hole. The forming of the shaft hole and the vent is completed simultaneously in a single pressing action, eliminating the need for subsequent machining.

[0024] Beneficially, this solution integrates vent forming into the pressing process through mold structure improvements, eliminating positioning errors caused by secondary machining. In existing technologies, burrs generated during machining originate from the interaction between the tool and the material. This solution, however, avoids material removal through mold forming, fundamentally eliminating burr generation and achieving simultaneous forming of the vent structure and shaft hole in one step, effectively eliminating machining steps. The mold forming process ensures the positional accuracy of the vent and shaft hole, avoiding assembly errors caused by step-by-step machining. The use of direct powder forming technology reduces material loss while improving product surface quality, solving the technological challenge of burr removal.

[0025] According to some embodiments of this application, the protrusion 120 includes a first arc-shaped segment 121 and a second arc-shaped segment 122, with the two second arc-shaped segments 122 disposed opposite to each other on both sides of the first arc-shaped segment 121.

[0026] It is understandable that the first arc segment 121 refers to the curved structure located in the central region of the protrusion 120, which can be implemented using an arc-shaped surface. Its radius of curvature matches the preset shape of the central region of the exhaust port, and is used to guide the powder to form a predetermined arc during the pressing process. The second arc segment 122 refers to the symmetrical curved structure distributed on both sides of the first arc segment 121, which can be implemented using an arc surface parallel to the axis of the first arc segment 121. Its radius of curvature is smaller than that of the first arc segment 121, and is used to constrain the edges on both sides of the exhaust port.

[0027] Specifically, during the mold-closing pressing process, the first arc-shaped segment 121 acts as a central guiding structure, applying axial constraint force to the metal powder and causing the central region of the vent to form a predetermined curvature. Two second arc-shaped segments 122 are symmetrically distributed on both sides of the first arc-shaped segment 121, and by simultaneously applying radial constraint forces, the powder maintains a symmetrical distribution during flow. Since the axes of the second arc-shaped segments 122 and the first arc-shaped segment 121 are parallel, a constraint force field with consistent direction is formed during pressing, preventing powder deflection caused by constraint forces in different directions. The symmetrically arranged arc-shaped segment structure ensures that the edges on both sides of the vent are simultaneously constrained by the same curvature, guaranteeing that the geometry of the vent sides after forming is completely symmetrical.

[0028] Beneficially, the split arc-shaped segment structure separates the constraint functions of the central and edge regions. The first arc segment 121 is responsible for center positioning, and the second arc segment 122 is responsible for edge shaping. This structural decomposition method ensures that the pressing stress is evenly distributed along different arc segments, effectively reducing local stress peaks and avoiding powder tearing or flash defects caused by stress concentration. This allows for precise control of the exhaust port geometry during the pressing process, with the central and edge regions simultaneously forming the predetermined curvature, and the two side contours maintaining complete symmetry. This structure effectively eliminates local burrs caused by shape asymmetry, allowing the exhaust port to reach the final shape requirements during the pressing stage, eliminating the need for subsequent machining.

[0029] Furthermore, the axis of the second arc segment 122 is parallel to the axis of the first arc segment 121.

[0030] It should be noted that parallel axes refer to the equidistant and non-intersecting geometric relationship between the centerlines of the two arc segments in three-dimensional space. This can be achieved using CNC machining or precision casting processes to position the axes of the arc segments. This feature, by constraining the consistency of the axial direction, ensures that the two arc segments form symmetrically distributed pressing areas during mold closing, avoiding differences in powder flow paths caused by axial misalignment.

[0031] Specifically, in the mold-closed state, the pressing space formed by the first arc segment 121 and the second arc segment 122 extends uniformly along the axial direction. When the powder material fills the mold cavity, the parallel axis design ensures that the pressing force distribution on both arc segments is symmetrical, and the material is compacted under the same pressure gradient. Since the parallel axis eliminates local pressure concentration, the filling density of powder particles in the vent edge area tends to be consistent, thereby suppressing the formation of burrs caused by density differences.

[0032] Beneficially, this design, through its parallel axis design, creates a complementary balance of pressing forces on both sides of the arc-shaped segments in space. This effectively eliminates uneven pressing caused by axis misalignment and solves the problem of uneven powder pressing due to non-parallel axes of the arc-shaped segments during the vent forming process. It also avoids vent shape deviations and burr formation. This design ensures a symmetrical material flow path during pressing, enabling the vent edge area to achieve the required forming precision for machining-free applications, thus improving the finished product yield.

[0033] Furthermore, the first arc segment 121 is inclined, and the angle between the axis of the first arc segment 121 and the axis of the body 100 is 30 degrees to 45 degrees.

[0034] Specifically, during the mold closing process, the inclined first arc segment 121 forms a directional material guiding surface. During pressing, the metal powder flows directionally along the inclined axis, and the powder particles are constrained within a preset path, preventing disordered accumulation at the edge of the protrusion 120. This angle range keeps the powder flow resistance within a controllable range, ensuring smooth flow while maintaining the structural integrity of the formed area, thereby eliminating burr defects caused by flow obstruction.

[0035] Beneficially, the directional guidance through asymmetrical tilt angle aligns the material flow path with the vent forming direction, fundamentally avoiding stagnation and resolving the burr problem caused by obstructed material flow during vent forming. This allows the pressed vent surface to directly meet usage requirements without subsequent machining. The optimized material flow path reduces the need for manual intervention in the pressing process while improving the consistency of the formed structure.

[0036] Furthermore, the diameter of the first arc segment 121 is smaller than the diameter of the second arc segment 122. In this application, preferably, the radius of the first arc segment 121 is 3.9 mm, and the radius of the second arc segment 122 is 3 mm.

[0037] Specifically, during the mold-closing and pressing process, the first arc segment 121, by matching the curvature parameters of the material flow characteristics, ensures that the powder maintains a continuous flow state when entering the vent region, avoiding material accumulation caused by abrupt changes in curvature. The second arc segment 122, through its smaller radius of curvature, creates a compression effect, establishing a directional pressure gradient at the edge of the vent, causing the powder particles to be simultaneously densified in the axial and radial directions. The combined effect of the two-stage curvature structures allows the material to complete self-correction during the forming stage, eliminating forming defects caused by local density differences.

[0038] Beneficially, this solution, by setting differentiated curvature parameters, creates a dynamic pressure compensation mechanism along the material flow path, ensuring uniform powder distribution before curvature solidification. This effectively eliminates material retention caused by curvature parameter mismatch during venting, preventing flash and burr formation and ensuring the molded parts meet direct assembly precision requirements. Furthermore, the combined design of curvature parameters provides suitable options for powder materials of different particle sizes, expanding the process's applicability while maintaining molding quality.

[0039] Furthermore, this application also provides a powder pressing device (not shown) that uses the above-mentioned forming mold.

[0040] Specifically, during the mold closing process, the powder pressing equipment uses the cooperation of the upper and lower punch dies to compress and shape the metal powder within the mold cavity. The hollow structure of the shaft hole forming part 110 directly forms the shaft hole of the part, while the first arc-shaped segment 121 and the second arc-shaped segment 122 of the protrusion 120 compress the powder during pressing, forming an exhaust port structure with a predetermined arc and tilt angle. By adjusting the arc radius and the angle between the protrusion segment and the axis, the exhaust port shape is formed in one step during the pressing stage, eliminating the need for subsequent machining. When the mold closes, the protrusion 120 works together with other areas of the mold cavity to ensure a smooth transition at the edge of the exhaust port, avoiding burrs. By integrating the exhaust port forming structure into the mold, the precise forming of the shaft hole and the exhaust port is completed simultaneously during the pressing stage, eliminating subsequent machining processes. The molded exhaust port surface has higher integrity, eliminating material breakage or edge burrs caused by cutting, significantly improving the part yield. This solves the problem of burrs caused by additional machining of exhaust ports in powder metallurgy compressor cylinder parts. By directly forming the exhaust port structure through a mold, the cutting process is avoided, eliminating the risk of burr formation at its source. Simultaneously, the positional accuracy of the shaft hole and exhaust port is guaranteed by the mold structure, reducing manual intervention and part rework rates, and improving production efficiency.

[0041] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0042] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A forming mold for cylinder exhaust ports that requires no machining, characterized in that, include: Upward punching module; The lower punch module is located below the upper punch module. The upper punch module and the lower punch module can be closed to form a mold cavity. The lower punch module includes a body, a shaft hole forming part and a protrusion disposed on the body. The body has a hollow structure to form the shaft hole forming part, and the protrusion is disposed on the edge of the shaft hole forming part.

2. The forming mold for cylinder exhaust port without machining according to claim 1, characterized in that, The protrusion includes a first arc segment and a second arc segment, with the two second arc segments disposed opposite each other on both sides of the first arc segment.

3. The forming mold for cylinder exhaust port without machining according to claim 2, characterized in that, The axis of the second arc segment is parallel to the axis of the first arc segment.

4. The forming mold for cylinder exhaust port without machining according to claim 3, characterized in that, The first arc segment is inclined, and the angle between the axis of the first arc segment and the axis of the main body is 30 degrees to 45 degrees.

5. The forming mold for cylinder exhaust port without machining according to claim 2, characterized in that, The diameter of the first arc segment is smaller than the diameter of the second arc segment.

6. The forming mold for a cylinder exhaust port that requires no machining, as described in claim 5, is characterized in that... A smooth transition section is provided at the connection between the first arc segment and the second arc segment.

7. The forming mold for a cylinder exhaust port that requires no machining, as described in claim 5, is characterized in that... The radius of the first arc segment is 3.9 mm; And / or, The radius of the second arc segment is 3mm.

8. A powder pressing device, characterized in that, Includes the forming mold as described in any one of claims 1 to 7.

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