Powder metallurgy air cylinder pressing forming die
By opening a avoidance groove on the side wall of the main mandrel of the press-forming mold of the powder metallurgy cylinder, the problem of bumps colliding with the main mandrel when the upper die position is offset is solved, extending the service life of the mold and improving the forming accuracy.
Patent Information
- Application Number
- CN202421513744.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-28
- Publication Date
- 2025-04-25
- Estimated Expiration
- 2034-06-28
AI Technical Summary
When the existing powder metallurgy cylinder press forming mold is offset at the upper die position, the bumps collide with the main core rod, which easily leads to cracking and damage to the bumps, resulting in burrs, succulents and forming accuracy of the exhaust ports, shortening the service life of the mold.
A powder metallurgy cylinder press forming mold is designed, and the side wall of the main mandrel is equipped with a barrier groove, which extends to the end surface along the axial direction of the main mandrel. When the upper die position is offset, the bump can extend into the barrier groove to avoid collision with the side wall and end surface of the main mandrel.
The avoidance space formed by the avoidance groove reduces the possibility of collision between the upper die and the main mandrel, extends the service life of the upper die, and improves the forming accuracy of the cylinder exhaust port, reducing the occurrence of burrs and succulents.
Smart Images
Figure CN222790623U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of powder metallurgy processing equipment, in particular to a powder metallurgy cylinder pressing and forming die. Background Art
[0002] The cylinder is a key component of the compressor. The cylinder is provided with an exhaust port. The machining accuracy of the exhaust port is a key factor affecting the exhaust. If burrs or excess flesh appear at the exhaust port, the performance of the compressor will be affected. The existing cylinder is usually made by a powder metallurgy forming process, and a mold is required to press metal powder into a compact. The mold consists of an upper punch, a lower punch and a main core rod. The exhaust port of the cylinder is formed by the protruding blocks on the forming surface of the upper punch cooperating with the side wall of the main core rod. When the upper punch is sleeved on the main core rod, if the position of the upper punch is offset, the block will first collide with the end face of the main core rod, which can easily cause the block to break and be damaged, thereby causing burrs and excess flesh to appear on the exhaust port after pressing, reducing the forming accuracy of the exhaust port and shortening the service life of the mold. Utility Model Content
[0003] The utility model aims to solve one of the technical problems in the related art to at least a certain extent. To this end, the utility model provides a powder metallurgy cylinder pressing forming die, which can avoid the bump on the upper punch die through the avoidance groove on the main core rod, and can reduce the possibility of the main core rod and the bump being damaged by collision, thereby improving the forming accuracy of the exhaust port and extending the service life of the upper punch die.
[0004] According to an embodiment of the utility model, a powder metallurgy cylinder pressing and forming die is provided, comprising an upper punch, a lower punch and a main core rod, the upper punch being provided with a first positioning hole, the upper punch being protrudingly provided with a bump, the bump being provided with an abutment surface, the abutment surface being flush with the side wall of the first positioning hole, the bump being used to form the exhaust port of the cylinder; the upper punch being capable of covering the lower punch, the lower punch being provided with a second positioning hole; the main core rod being capable of being sequentially passed through the second positioning hole and the first positioning hole from bottom to top, and the side wall of the main core rod being capable of abutting against the abutment surface, the side wall of the main core rod being provided with an avoidance groove, and the avoidance groove extending along the axial direction of the main core rod to the end face of the main core rod, and when the main core rod is passed through the first positioning hole, the bump can extend into the avoidance groove.
[0005] A powder metallurgy cylinder pressing and forming die according to an embodiment of the utility model has at least the following beneficial effects: during assembly, the main core rod is inserted into the second positioning hole of the lower punch, and then the upper punch is sleeved on the main core rod and covered on the lower punch. In the process of sleeved the upper punch on the main core rod, the main core rod is gradually inserted into the first positioning hole. Since the side wall of the main core rod is provided with an avoidance groove, and the avoidance groove extends along the axial direction of the main core rod to the end face of the main core rod, when the upper punch is offset, the protrusion can extend into the avoidance groove without abutting against the side wall and end face of the main core rod. Until the main core rod is inserted into the first positioning hole and the position of the upper punch is positioned by cooperating between the main core rod and the first positioning hole, the abutting surface of the protrusion will abut against the side wall of the main core rod to cooperate with the exhaust port of the forming cylinder. The avoidance space formed by the avoidance groove is used to avoid the protrusion, which can reduce the possibility of the protrusion and the main core rod colliding and being damaged during the process of the upper punch being sleeved on the main core rod, thereby reducing the edge scraping phenomenon of the protrusion, so as to extend the service life of the upper punch, and can reduce the possibility of burrs or excess flesh at the exhaust port after the cylinder is formed, so as to improve the forming accuracy of the cylinder exhaust port.
[0006] According to some embodiments of the utility model, the avoidance groove is arc-shaped, and the avoidance groove is arranged along the circumference of the main core rod, the maximum chord length of the avoidance groove along the orthographic projection of the cross section of the main core rod is a, the part of the abutment surface close to the axis of the first positioning hole is the first wall surface, and the maximum chord length of the orthographic projection of the first wall surface along the cross section of the main core rod is b, satisfying: a>b.
[0007] According to some embodiments of the present invention, the following is satisfied: 0.5 mm ≤ ab ≤ 1 mm.
[0008] According to some embodiments of the utility model, along the axial direction of the main core rod, the height of the protrusion and the depth of the avoidance groove are d and e respectively, satisfying: e>d.
[0009] According to some embodiments of the present invention, the following is satisfied: 0.2mm≤ed≤0.5mm.
[0010] According to some embodiments of the present invention, the radial width of the avoidance groove is c, which satisfies: 0.2mm≤c≤1mm.
[0011] According to some embodiments of the present invention, the condition c=0.5 mm is satisfied.
[0012] According to some embodiments of the present invention, the wall surface of the avoidance groove parallel to the end surface of the main core rod is a second wall surface, and the intersection of the second wall surface and the side wall of the main core rod is set to be a rounded corner.
[0013] According to some embodiments of the utility model, the main core rod is provided with a forming portion protruding radially, and the forming portion extends along the axial direction of the main core rod to the end face of the main core rod, the forming portion is used to form the slide groove of the cylinder, and the forming portion can be sequentially penetrated into the second positioning hole and the first positioning hole from bottom to top.
[0014] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:
[0016] Figure 1 It is a bottom view of the upper punch die of the powder metallurgy cylinder pressing die of the embodiment of the utility model;
[0017] Figure 2 yes Figure 1 A partial enlarged view of the middle A;
[0018] Figure 3 yes Figure 2 MM cross-sectional view;
[0019] Figure 4 It is a top view of the main core rod of the powder metallurgy cylinder pressing and forming die of the embodiment of the utility model;
[0020] Figure 5 yes Figure 4 A partial enlarged view of point B in the middle;
[0021] Figure 6 yes Figure 5 NN cross-sectional view;
[0022] Figure 7 It is a top view of the lower punch of the powder metallurgy cylinder pressing die of the embodiment of the utility model;
[0023] Figure 8 It is a structural schematic diagram of a cylinder formed by a powder metallurgy cylinder forming die according to an embodiment of the utility model;
[0024] Fig. 9 It is another structural schematic diagram of a cylinder formed by a powder metallurgy cylinder pressing mold according to an embodiment of the utility model.
[0025] Description of reference numerals:
[0026] The upper punch 100 , the first positioning hole 110 , the protrusion 120 , the abutment surface 121 , the first wall surface 122 , the lower punch 200 , the second positioning hole 210 , the main core rod 300 , the avoidance groove 310 , the second wall surface 311 , the fillet 312 , the forming portion 320 , the cylinder 400 , the exhaust port 410 , and the slide groove 420 . DETAILED DESCRIPTION
[0027] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.
[0028] In the description of the present invention, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.
[0029] In the description of the present utility model, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood to exclude the number itself, and "above", "below", "within" etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.
[0030] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.
[0031] It is understandable that, referring to Figures 1 to 9The utility model is a powder metallurgy cylinder pressing forming die, comprising an upper punch 100, a lower punch 200 and a main core rod 300, the upper punch 100 is provided with a first positioning hole 110, the upper punch 100 is protrudingly provided with a convex block 120, the convex block 120 is provided with an abutting surface 121, the abutting surface 121 is flush with the side wall of the first positioning hole 110, and the convex block 120 is used to form the exhaust port 410 of the cylinder 400; the upper punch 100 can cover the lower punch 200, and the lower punch 200 can be used to form the exhaust port 410 of the cylinder 400. The mold 200 is provided with a second positioning hole 210; the main core rod 300 can be sequentially inserted into the second positioning hole 210 and the first positioning hole 110 from bottom to top, and the side wall of the main core rod 300 can abut against the abutment surface 121, and the side wall of the main core rod 300 is provided with an avoidance groove 310, and the avoidance groove 310 extends along the axial direction of the main core rod 300 to the end face of the main core rod 300, and when the main core rod 300 is inserted into the first positioning hole 110, the protrusion 120 can extend into the avoidance groove 310.
[0032] During assembly, the main core rod 300 is inserted into the second positioning hole 210 of the lower punch 200, and then the upper punch 100 is sleeved on the main core rod 300 and covered on the lower punch 200. In the process of sleeved the upper punch 100 on the main core rod 300, the main core rod 300 is gradually inserted into the first positioning hole 110. Since the side wall of the main core rod 300 is provided with an avoidance groove 310, and the avoidance groove 310 extends along the axial direction of the main core rod 300 to the end face of the main core rod 300, when the upper punch 100 is shifted, the protrusion 120 can extend into the avoidance groove 310 without abutting against the side wall and end face of the main core rod 300, until the main core rod 300 is inserted into the first positioning hole 110 and passes through the main core rod After the upper punch 100 is positioned by cooperating with the first positioning hole 110, the abutting surface 121 of the protrusion 120 abuts against the side wall of the main core rod 300 to cooperate with the exhaust port 410 of the forming cylinder 400. The protrusion 120 is avoided by the avoidance space formed by the avoidance groove 310, which can reduce the possibility of collision and damage between the protrusion 120 and the main core rod 300 during the process of the upper punch 100 being sleeved on the main core rod 300, thereby reducing the edge scraping phenomenon of the protrusion 120 to extend the service life of the upper punch 100, and can reduce the possibility of burrs or excess flesh at the exhaust port 410 after the cylinder 400 is formed, so as to improve the forming accuracy of the exhaust port 410 of the cylinder 400.
[0033] It should be noted that, in the process of sleeve-mounting the upper punch 100 on the main core rod 300, the upper punch 100 and the main core rod 300 are initially in a separated state, and then the upper punch 100 is sleeved on the main core rod 300 from top to bottom. Since the protrusion 120 is protrudingly arranged on the upper punch 100, and the protrusion 120 is higher than the forming surface of the upper punch 100, when the upper punch 100 is offset, the end face and side wall of the main core rod 300 first collide with the protrusion 120, causing the protrusion 120 to be deformed. In order to prevent the main core rod 300 from being cracked and damaged, an avoidance groove 310 is provided on the side wall of the main core rod 300 to reduce the possibility of collision between the protrusion 120 and the main core rod 300. When the side wall of the main core rod 300 abuts against the side wall of the first positioning hole 110, the position of the upper punch 100 can be positioned so that the upper punch 100 can move along the axial direction of the main core rod 300. Then, the abutting surface 121 of the protrusion 120 abuts against the side wall of the main core rod 300 to cooperate with the exhaust port 410 of the forming cylinder 400.
[0034] When the bump 120 collides with the main core rod 300 and breaks, a gap is generated between the bump 120 and the main core rod 300, and metal powder is filled in the gap, so that burrs or excess flesh appear at the exhaust port 410 of the cylinder 400 after pressing.
[0035] It is understandable that, referring to Figure 1 , Figure 2 , Figure 4 and Figure 5 The avoidance groove 310 is in an arc shape, and the avoidance groove 310 is arranged along the circumference of the main core rod 300. The maximum chord length of the orthographic projection of the avoidance groove 310 along the cross section of the main core rod 300 is a. The portion of the abutting surface 121 close to the axis of the first positioning hole 110 is the first wall surface 122. The maximum chord length of the orthographic projection of the first wall surface 122 along the cross section of the main core rod 300 is b, which satisfies: a>b. Since a>b, the avoidance groove 310 has a clearance along the circumference of the main core rod 300, thereby increasing the circumferential avoidance space of the avoidance groove 310, which can reduce the possibility of the protrusion 120 colliding with the main core rod 300 and being damaged after the upper punch 100 is offset in the circumferential position, and can reduce the possibility of the protrusion 120 colliding with the wall surface of the avoidance groove 310 after extending into the avoidance groove 310, thereby improving the forming quality of the exhaust port 410 and extending the service life of the upper punch 100.
[0036] Specifically, refer to Figure 1 , Figure 2 , Figure 4 and Figure 5, satisfying: 0.5mm≤ab≤1mm. Since 0.5mm≤ab≤1mm, the possibility of collision and damage between the protrusion 120 and the main core rod 300 after the upper punch 100 is offset in the circumferential direction can be reduced, and at the same time, the circumferential groove width of the avoidance groove 310 can be reduced, thereby reducing the difficulty of processing the avoidance groove 310 and facilitating the processing and forming of the main core rod 300.
[0037] It should be noted that the value of ab can be 0.5mm, 0.75mm, 1mm, etc., as long as: 0.5mm≤ab≤1mm.
[0038] It is understandable that, referring to Figures 1 to 6 , along the axial direction of the main core rod 300, the height of the protrusion 120 and the depth of the avoidance groove 310 are d and e respectively, satisfying: e>d. Since e>d, the avoidance groove 310 has a clearance along the axial direction of the main core rod 300, thereby increasing the axial avoidance space of the avoidance groove 310, so that after the main core rod 300 is inserted into the first positioning hole 110, the abutting surface 121 of the protrusion 120 abuts against the main core rod 300, which can reduce the risk of the protrusion 120 colliding with the wall of the avoidance groove 310 after extending into the avoidance groove 310, thereby reducing the possibility of damage to the protrusion 120, thereby improving the forming quality of the exhaust port 410 and extending the service life of the upper punch 100.
[0039] Specifically, refer to Figures 1 to 6 , satisfying: 0.2mm≤ed≤0.5mm. Since 0.2mm≤ed≤0.5mm, the risk of the bump 120 colliding with the wall of the avoidance groove 310 after extending into the avoidance groove 310 can be reduced, thereby reducing the possibility of damage to the bump 120. At the same time, the groove depth of the avoidance groove 310 can be reduced, thereby reducing the difficulty of processing the avoidance groove 310 and facilitating the processing and forming of the main core rod 300.
[0040] It should be noted that the value of ed can be 0.2mm, 0.35mm, 0.5mm, etc., as long as: 0.2mm≤ed≤0.5mm.
[0041] It is understandable that, referring to Figure 5 , the radial width of the avoidance groove 310 is c, which satisfies: 0.2 mm ≤ c ≤ 1 mm. Since 0.2 mm ≤ c ≤ 1 mm, the radial avoidance space of the avoidance groove 310 can be increased, thereby reducing the possibility of collision and damage between the bump 120 and the main core rod 300. At the same time, the radial slot width of the avoidance groove 310 can be reduced, thereby reducing the influence of the avoidance groove 310 on the structural strength of the main core rod 300.
[0042] It should be noted that the value of c can be 0.2mm, 0.3mm, 1mm, etc., as long as: 0.2mm≤c≤1mm.
[0043] Specifically, refer to Figure 5 , satisfying: c=0.5mm. The possibility of collision and damage between the bump 120 and the main core rod 300 can be reduced, and at the same time, the radial slot width of the avoidance groove 310 can be reduced, thereby reducing the processing difficulty of the avoidance groove 310 and facilitating the processing and forming of the main core rod 300.
[0044] It is understandable that, referring to Figure 6 The wall surface of the avoidance groove 310 parallel to the end surface of the main core rod 300 is the second wall surface 311, and the intersection of the second wall surface 311 and the side wall of the main core rod 300 is set as a rounded corner 312. By setting the intersection of the second wall surface 311 and the side wall of the main core rod 300 as the rounded corner 312, the intersection of the second wall surface 311 and the side wall of the main core rod 300 can be smoothly transitioned. When the protrusion 120 collides with the intersection of the second wall surface 311 and the side wall of the main core rod 300, the protrusion 120 can be guided to slide along the wall surface of the rounded corner 312, thereby reducing the possibility of the protrusion 120 being damaged by the collision with the main core rod 300.
[0045] Understandably, Figure 4 , Figure 8 and Fig. 9 The main core rod 300 is provided with a forming portion 320 protruding in the radial direction, and the forming portion 320 extends to the end surface of the main core rod 300 along the axial direction of the main core rod 300. The forming portion 320 is used to form the slide groove 420 of the cylinder 400, and the forming portion 320 can be sequentially penetrated in the second positioning hole 210 and the first positioning hole 110 from bottom to top. Since the main core rod 300 is provided with a forming portion 320 protruding in the radial direction, the circumferential positions of the upper punch 100 and the lower punch 200 can be positioned by sequentially penetrating the second positioning hole 210 and the first positioning hole 110 from bottom to top through the forming portion 320, thereby reducing the possibility of the protrusion 120 extending into the avoidance groove 310 and colliding with the wall surface of the avoidance groove 310, thereby improving the forming accuracy of the exhaust port 410 and extending the service life of the upper punch 100.
[0046] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in the relevant technical field without departing from the purpose of the present invention.
Claims
1. A powder metallurgy cylinder pressing die, characterized in that: include: An upper punch, wherein the upper punch is provided with a first positioning hole, the upper punch is provided with a convex block, the convex block is provided with an abutment surface, the abutment surface is flush with the side wall of the first positioning hole, and the convex block is used to form the exhaust port of the cylinder; A lower punch, the upper punch can cover the lower punch, and the lower punch is provided with a second positioning hole; A main core rod, the main core rod can be inserted into the second positioning hole and the first positioning hole in sequence from bottom to top, and the side wall of the main core rod can abut the abutment surface, an avoidance groove is provided on the side wall of the main core rod, and the avoidance groove extends along the axial direction of the main core rod to the end face of the main core rod, when the main core rod is inserted into the first positioning hole, the protrusion can extend into the avoidance groove.
2. The powder metallurgy cylinder pressing mold according to claim 1, characterized in that: The avoidance groove is in an arc shape and is arranged along the circumference of the main core rod. The maximum chord length of the avoidance groove along the orthographic projection of the cross section of the main core rod is a. The part of the abutment surface close to the axis of the first positioning hole is the first wall surface. The maximum chord length of the orthographic projection of the first wall surface along the cross section of the main core rod is b, satisfying: a>b.
3. The powder metallurgy cylinder pressing mold according to claim 2, characterized in that: Satisfies: 0.5mm≤ab≤1mm.
4. The powder metallurgy cylinder pressing mold according to claim 1, characterized in that: Along the axial direction of the main core rod, the height of the protrusion and the depth of the avoidance groove are d and e respectively, satisfying: e>d.
5. The powder metallurgy cylinder pressing die according to claim 4, characterized in that: Satisfies: 0.2mm≤ed≤0.5mm.
6. The powder metallurgy cylinder pressing mold according to claim 1, characterized in that: The radial width of the avoidance groove is c, which satisfies: 0.2mm≤c≤1mm.
7. The powder metallurgy cylinder pressing die according to claim 6, characterized in that: Satisfies: c=0.5mm.
8. The powder metallurgy cylinder pressing die according to claim 1, characterized in that: The wall surface of the avoidance groove parallel to the end surface of the main core rod is a second wall surface, and the intersection of the second wall surface and the side wall of the main core rod is set as a rounded corner.
9. The powder metallurgy cylinder pressing die according to claim 1, characterized in that: The main core rod is provided with a forming portion protruding radially, and the forming portion extends along the axial direction of the main core rod to the end surface of the main core rod, the forming portion is used to form the slide groove of the cylinder, and the forming portion can be sequentially penetrated into the second positioning hole and the first positioning hole from bottom to top.