Piston mold

Abstract

The piston mold comprises a first mold body, a second mold body and an ejection assembly, the first mold body and the second mold body are assembled out of an inner cavity to machine a piston, the ejection assembly is arranged on the side, away from the first mold body, of the second mold body and comprises an insert base, an ejection rod and a supporting block, and the supporting block is movably arranged on the insert base; the supporting block is suitable for pushing the ejector rod to move in the ejection direction so as to stretch into the inner cavity, the piston located in the inner cavity can be ejected out through the ejector rod, the supporting block is provided with a center area matched with the ejector rod and an edge area located outside the center area, and the fit clearance between the center area and the insert base is smaller than the fit clearance between the edge area and the insert base. According to the piston mold, the movement clearance of the supporting block can be reduced, movement guiding of the supporting block is achieved, so that movement clamping stagnation of the supporting block is improved, ejection of the piston is simpler and more convenient, the production efficiency of the piston mold can be improved, and the demolding difficulty is effectively reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of molds, in particular to a piston mold. Background Art

[0002] In the relevant technology, the piston is the "heart" of the automobile engine, bearing alternating mechanical and thermal loads, and is one of the key components in the engine with the worst working conditions. Conventional aluminum alloy and cast iron pistons are far from meeting the new technical requirements of high-performance engines such as high boost, low fuel consumption, and low emissions. Forged steel pistons have become an ideal choice. Forged steel pistons have excellent high temperature resistance and can withstand high explosive pressure.

[0003] However, the existing piston mold has a large movement clearance of the ejector assembly, and jamming is prone to occur during the ejection process, making it difficult to remove the processed product. Utility Model Content

[0004] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model aims to provide a piston mold, which has low difficulty in removing products and high production efficiency.

[0005] According to the piston mold of the embodiment of the present application, it includes: a first mold, a second mold and an ejection assembly. The first mold and the second mold are combined to form an inner cavity to process the piston. The ejection assembly is arranged on the side of the second mold away from the first mold. The ejection assembly includes: an insert seat, a push rod and a support block. The support block is movably arranged on the insert seat. The support block is suitable for pushing the push rod to move along the ejection direction to extend into the inner cavity, so as to eject the piston located in the inner cavity through the push rod. The support block has a central area that cooperates with the push rod and an edge area outside the central area. The fitting clearance between the central area and the insert seat is smaller than the fitting clearance between the edge area and the insert seat.

[0006] According to the piston mold of the embodiment of the present application, the movement clearance of the support block can be reduced, and the movement guidance of the support block can be achieved to improve the movement stagnation of the support block, so that the ejection of the piston is simpler and more convenient, which can improve the production efficiency of the piston mold and effectively reduce the difficulty of demolding.

[0007] According to some embodiments of the present application, in the ejection direction, the projection profile of the support block includes: a main body portion, and two arc portions located on both sides of the main body portion and symmetrically arranged, the main body portion is configured as an oblong or rectangular shape, and the arc portions and at least part of the main body portion define the central area.

[0008] Furthermore, the center of the equivalent circle of the arc-shaped portion is located at the center of the main body portion.

[0009] According to some embodiments of the present application, the ejector rod includes: a first rod portion cooperating with the support block, and a second rod portion at least partially extending into the inner cavity, and in the ejection direction, the projection contour of the second rod portion is within the projection contour range of the first rod portion.

[0010] Further, in the ejection direction, the projection profile of the second rod portion is an oblong or elliptical shape.

[0011] According to some embodiments of the present application, a receiving groove is provided on the insert seat, the support block is movably disposed in the receiving groove, and the groove depth of the receiving groove is smaller than the dimension of the insert seat in the ejection direction.

[0012] Furthermore, the sum of the size of the support block in the ejection direction and the movement stroke of the support block is less than or equal to the groove depth of the accommodating groove.

[0013] In some embodiments, the ejection assembly further includes: an elastic member, the elastic member elastically pushes between the support block and the second mold, and the insert seat is provided with a mounting hole for accommodating the elastic member.

[0014] Furthermore, the mounting hole is configured as an oblong hole.

[0015] According to some embodiments of the present application, the first mold includes: a first mold sleeve and a first mold core, the second mold includes: a second mold sleeve and a second mold core, the first mold sleeve cooperates with the second mold sleeve, the first mold core cooperates with the second mold core, and the insert seat and the second mold core are opposite to each other in the ejection direction.

[0016] 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

[0017] 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:

[0018] Figure 1 is a schematic diagram of a piston according to an embodiment of the present application;

[0019] Figure 2 is a schematic diagram of a piston mold at an angle according to an embodiment of the present application;

[0020] Figure 3 is a schematic diagram of a piston mold according to an embodiment of the present application from another angle;

[0021] Figure 4 is a schematic diagram of a support block at an angle according to an embodiment of the present application;

[0022] Figure 5 is a schematic diagram of a support block according to an embodiment of the present application from another angle;

[0023] Figure 6 is a schematic diagram of an angle of a top rod according to an embodiment of the present application;

[0024] Figure 7 is a schematic diagram of a top rod according to an embodiment of the present application from another angle;

[0025] Figure 8 It is a schematic diagram of an insert seat according to an embodiment of the present application.

[0026] Reference numerals:

[0027] Piston mold 100, piston 200,

[0028] The first mold 10, the first mold sleeve 11, the first mold core 12,

[0029] The second mold 20, the second mold sleeve 21, the second mold core 22,

[0030] The ejector assembly 30, the insert seat 31, the receiving groove 311, the mounting hole 312, the ejector rod 32, the first rod portion 321, the second rod portion 322, the support block 33, the main body portion 331, the arc portion 332, the elastic member 34,

[0031] Piston skirt 210, pin seat 220,

[0032] The central area is a, and the edge area is b. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0034] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0035] Reference to "embodiment" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments.

[0036] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0037] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0038] In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device are only exemplary descriptions and should not constitute any limitation to the present application.

[0039] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships 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 referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0040] In the description of the present invention, a first feature being “above” or “below” a second feature may include that the first and second features are directly in contact with each other, or may include that the first and second features are not in direct contact but are in contact with each other via another feature therebetween.

[0041] In the description of the present invention, a first feature “above”, “over” and “above” a second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature.

[0042] The term "plurality" used in the present application refers to two or more (including two).

[0043] Reference below Figure 1-Figure 8 A piston mold 100 according to an embodiment of the present invention is described.

[0044] like Figure 2 and Figure 3 As shown, the piston mold 100 according to the embodiment of the present application includes: a first mold 10, a second mold 20 and an ejection assembly 30.

[0045] The first mold 10 and the second mold 20 are combined to form an inner cavity, and the outer contour of the inner cavity can be consistent with the piston 200 to process the piston 200. The ejection assembly 30 is arranged on the side of the second mold 20 away from the first mold 10. The ejection assembly 30 includes: an insert seat 31, a push rod 32 and a support block 33. The support block 33 is movably arranged on the insert seat 31. The support block 33 is suitable for pushing the push rod 32 to move along the ejection direction to extend into the inner cavity, so as to eject the piston 200 located in the inner cavity through the push rod 32. The support block 33 has a central area a that cooperates with the push rod 32 and an edge area b located outside the central area a. The matching clearance between the central area a and the insert seat 31 is smaller than the matching clearance between the edge area b and the insert seat 31.

[0046] Specifically, the first mold 10 and the second mold 20 can be stacked in the height direction, with the first mold 10 located at the top and the second mold 20 located at the bottom. The ejector assembly 30 is arranged below the second mold 20. The insert seat 31, the first mold 10, and the second mold 20 can be connected. The support block 33 is movably arranged in the insert seat 31. The support block 33 and the ejector rod 32 are pushed and matched. The mold seat push rod pushes the support block 33 to slide in the insert seat 31. The support block 33 drives the ejector rod 32 to move. At least a portion of the ejector rod 32 extends into the inner cavity to eject the piston 200 in the inner cavity, complete the demolding of the piston 200, and reduce the difficulty of demolding.

[0047] It is understandable that, combined with Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, by setting the support block 33 to a structure in which the matching clearance between the central area a and the insert seat 31 is smaller than the matching clearance between the edge area b and the insert seat 31, for example, the existing support block 33 with an oblong projection profile in the height direction is changed to Figure 5 The structural shape shown is such that the gap in the matching area is smaller than the gap in the edge area. The smaller gap in the matching area can be used to guide the bracket 33 and reduce the movement clearance to improve the movement stagnation of the bracket 33.

[0048] According to the piston mold 100 of the embodiment of the present application, the movement clearance of the support block 33 can be reduced, and the movement guidance of the support block 33 can be achieved to improve the movement stagnation of the support block 33, so that the ejection of the piston 200 is simpler and more convenient, which can improve the production efficiency of the piston mold 100 and effectively reduce the difficulty of demolding.

[0049] like Figure 4 and Figure 5 As shown, according to some embodiments of the present application, in the ejection direction, the projection profile of the support block 33 includes: a main body portion 331, two arc portions 332 ( Figure 5 The main body 331 is configured as an oblong or rectangular shape, and the arc portion 332 and at least a portion of the main body 331 define a central area a.

[0050] That is to say, the middle area is an area close to a circle defined by at least part of the arc portion 332 and the main body portion 331, while the edge area is other areas outside the middle area. The gap in the edge area is larger and the gap in the circular area is smaller, which can reduce the movement clearance and improve the guiding effect.

[0051] Preferably, the center of the equivalent circle of the arc portion 332 is located at the center of the main body portion 331, so that the arc portion 332 and at least part of the main body portion 331 can form a circular area with a smaller gap in the circular area, a better guiding effect, and a higher movement stability of the support block 33.

[0052] See also Figure 6 and Figure 7 As shown, according to some embodiments of the present application, the ejector rod 32 includes: a first rod portion 321 that cooperates with the support block 33, and a second rod portion 322 that at least partially extends into the inner cavity, and in the ejection direction, the projection contour of the second rod portion 322 is located within the projection contour range of the first rod portion 321.

[0053] Specifically, one end of the first rod portion 321 is connected to the second rod portion 322, and the other end of the second rod portion 322 is constructed as a free end, which is suitable for extending into the inner cavity. The projection contour size of the second rod portion 322 is within the projection contour range of the first rod portion 321, that is, the rod diameter of the second rod portion 322 is less than or equal to the rod diameter of the first rod portion 321. The size of the second rod portion 322 can be set more reasonably, and the second rod portion 322 is easier to enter the inner cavity. At the same time, the larger first rod portion 321 has a larger contact area with the support block 33, and the thrust area of ​​the support block 33 is larger. While improving the smoothness of movement, the pressure in the force-bearing areas of the two can be improved to reduce the wear of the push rod 32 and the support block 33, and extend the service life of the piston mold 100.

[0054] Combination Figure 6 and Figure 7 As shown, further, in the ejection direction, the projection profile of the second rod portion 322 is an oblong or elliptical shape.

[0055] In this way, the outline size of the second rod portion 322 in the embodiment of the present application is larger than the outline size of the second rod portion 322 in the prior art. The second rod portion 322 with a larger outline size can reduce the probability of bending and deformation of the push rod 32 and extend the tolerance of the push rod 32. The push rod 32 needs to bend after performing more ejection actions, and there is no need to frequently replace the push rod 32, which can improve production efficiency.

[0056] Combination Figure 2 , Figure 3 As shown, according to some embodiments of the present application, a receiving groove 311 is provided on the insert seat 31, and the support block 33 is movably disposed in the receiving groove 311, and the groove depth of the receiving groove 311 is smaller than the dimension of the insert seat 31 in the ejection direction.

[0057] Specifically, a blind hole is opened on the insert seat 31, and the blind hole is formed into a receiving groove 311. A support block 33 can be set in the receiving groove 311, and the support block 33 can be slidably set in the receiving groove 311. By making the area directly passing through the upper and lower surfaces of the insert seat 31 smaller, the structural strength of the insert seat 31 can be improved. The higher the structural strength of the insert seat 31, the service life of the piston mold 100 can also be effectively improved, and the working stability and reliability can be improved.

[0058] It is understandable that the sum of the size of the support block 33 in the ejection direction and the movement stroke of the support block 33 is less than or equal to the depth of the accommodating groove 311 .

[0059] Therefore, the support block 33 is always located in the accommodating groove 311, which can prevent foreign matter from entering the accommodating groove 311, reduce the wear of the piston mold 100, and improve the processing accuracy and processing quality of the piston mold 100. At the same time, the groove depth of the accommodating groove 311 is more reasonable. The groove depth is greater than or equal to the sum of the movement stroke of the support block 33 in the groove and the size of the support block 33 in the ejection direction, and can also take into account the structural strength of the insert seat 31 and the movement stability of the support block 33.

[0060] like Figure 2 As shown, in some embodiments, the ejector assembly 30 further includes an elastic member 34 , which is elastically pushed between the support block 33 and the second mold 20 , and a mounting hole 312 for accommodating the elastic member 34 is provided on the insert seat 31 .

[0061] Specifically, the setting of the elastic member 34 can provide elastic buffering for the ejector pin 32 to reduce the impact of the support block 33 on the ejector pin 32 during the ejection action, thereby extending the service life of the ejector pin 32 and reducing the replacement frequency of the ejector pin 32. The ejector pin 32 can also be driven by the elastic member 34 to achieve reset, that is, a limiting portion is provided on the end of the first rod portion 321, and the elastic member 34 is sleeved on the limiting portion. The limiting portion and one end of the elastic member 34 are both provided in the mounting hole 312. When the support block 33 pushes the ejector pin 32, the elastic member 34 elastically pushes against the support block 33 or the second mold 20 to achieve buffering and reset the ejector pin 32, so that the ejector pin 32 can be automatically reset, the structure of the ejection assembly 30 is simplified, and the cost of the piston mold 100 is reduced.

[0062] Preferably, the mounting hole 312 is configured as an oblong hole.

[0063] Specifically, the distance between the push rods 32 of pistons 200 of different specifications is different, and the mounting hole 312 is constructed as an oblong hole, so that the distance between the push rods 32 of the piston mold 100 of the embodiment of the present application can be adjusted to adapt to the processing requirements of pistons 200 of different specifications, thereby improving the adaptability of the piston mold 100.

[0064] According to some embodiments of the present application, the first mold 10 includes: a first mold sleeve 11 and a first mold core 12, the second mold 20 includes: a second mold sleeve 21 and a second mold core 22, the first mold sleeve 11 cooperates with the second mold sleeve 21, the first mold core 12 cooperates with the second mold core 22, and the insert seat 31 is opposite to the second mold core 22 in the ejection direction.

[0065] First of all, it should be pointed out that the piston 200 is the "heart" of the automobile engine, bearing alternating mechanical loads and thermal loads, and is one of the key components in the engine with the worst working conditions. It is necessary to further reduce the fuel consumption and emissions of the engine, and the conventional aluminum alloy and cast iron piston 200 are far from meeting the new technical requirements of high-performance engines such as high boost, low fuel consumption, and low emissions. Forged steel piston 200 has become an ideal choice. Forged steel piston 200 has excellent high temperature resistance and can withstand the high explosion pressure of the engine. At present, it has basically completely replaced aluminum alloy piston 200, and the market prospect is quite broad.

[0066] Below, take the heavy-duty commercial vehicle engine as an example. Figure 1 As shown, according to the tonnage and displacement of commercial vehicles, the size of the forged steel piston 200 in its engine is divided into different cylinder diameters, generally between φ108 and φ140 mm, and the corresponding engine displacement is 8 to 13 L. Due to the special product structure of the forged steel piston 200, the cavity of the piston skirt 210 is deep and the wall thickness is thin, and the wall thickness of the pin seat 220 is thick. This special structure causes the forged steel piston 200 to have violent metal flow and great difficulty in forming during the forging process. There are generally technical problems such as low mold life, poor surface quality of the piston 200, and difficulty in controlling the consistency of the piston 200.

[0067] Based on this, the present application proposes a piston mold 100, the first mold 10 includes a first mold sleeve 11 and a first mold core 12, the second mold 20 includes a second mold sleeve 21 and a second mold core 22, the first mold sleeve 11 and the first mold core 12 can be made of different materials, the second mold sleeve 21 and the second mold core 22 can be made of different materials, the first mold core 12 and the second mold core 22 are made of materials with higher hardness, which can increase the mold life and reduce the mold cost.

[0068] Furthermore, based on the structure of the piston mold 100, the mold cavity of the first mold 10 is shallower, and the mold cavity of the second mold 20 is deeper, so the push rod 32 assembly needs to be set on the side of the second mold 20 away from the first mold 10, while the cavity of the first mold 10 is shallower, and the push rod 32 may not be set.

[0069] It is understandable that a mold base push rod 32 can be set outside, and the mold base push rod pushes the support block 33. The support block 33 slides in the insert seat 31, driving the push rod 32 to move upward to push the piston 200 out of the second mold 20, thereby achieving smooth demolding of the piston 200.

[0070] However, the existing ejector assembly 30 has the following disadvantages:

[0071] (1) The projection profile of the support block 33 in the ejection direction is an oblong hole (i.e., a runway shape). In a specific embodiment, the length of the support block 33 is 112 mm, the width is 70 mm, and the single-sided gap between the support block 33 and the insert seat 31 is 0.5 mm. The gap is relatively large, and the support block 33 is prone to jamming when moving up and down in the insert seat 31, resulting in the piston 200 being unable to be ejected smoothly.

[0072] (2) The piston 200 is mainly in contact with the second mold 20 in the skirt cavity. The curved surface structure of the skirt cavity is complex. The contact area between the piston 200 and the second mold 20 is large, and the required ejection force is large. The structural strength of the existing ejector rod 32 is difficult to meet the ejection requirements. It is very easy to deform and bend during continuous production, the replacement frequency is high, and the production efficiency is low.

[0073] (3) In order to facilitate the movement of the support block 33 in the insert seat 31, a through-structured accommodating groove 311 is provided on the insert seat 31. The support block 33 is arranged in the accommodating groove 311. The hollow area of ​​the insert seat 31 is large, the strength is reduced, and the insert seat 31 is prone to dents and cracks, which in turn reduces the life of the second mold 20 in contact with it.

[0074] (4) The spacing between the multiple push rods 32 used to process pistons 200 with different cylinder diameters is different. When switching, different insert seats 31 need to be replaced, and the universality of the insert seats 31 is poor.

[0075] Based on the above technical shortcomings, the present application proposes a piston mold 100. The piston mold 100 of the embodiment of the present application can achieve large-scale continuous production by improving the structure of the push rod 32, the support block 33 and the insert seat 31.

[0076] Specifically, if Figure 4 and Figure 5 As shown, the support block 33 of the embodiment of the present application can be optimized from a "rectangular" structure to a "drum-shaped" structure. The single-sided gap between the middle "drum-shaped" structure and the insert seat 31 is 0.3mm, and the gap is used for guiding. The remaining positions have a single-sided gap of 0.5mm, which effectively solves the jamming phenomenon of the support block 33.

[0077] like Figure 6 and Figure 7 As shown, the use of an elliptical cross-section ejector rod 32 increases the contact area between the ejector rod 32 and the piston 200, making ejection more stable and reliable, and completely eliminating the bending phenomenon of the ejector rod 32. There is no need to frequently replace the ejector rod 32, and the shift production quantity can be increased from 400 pieces / shift to 800 pieces / shift, effectively improving production efficiency.

[0078] Combination Figure 3 and Figure 8 As shown, the support block 33 in the insert seat 31 is processed within the range of the movement stroke area, and there is no need to set the accommodating groove 311 that passes through the insert seat 31. The upper surface of the insert seat 31 only needs to be processed with the mounting hole 312 for mounting the elastic member 34. The strength of the insert seat 31 can be increased to effectively improve the life of the piston mold 100. In some embodiments, the mold life can reach 50,000 pieces and then be repaired and refurbished. The average mold life of the second mold 20 is increased from the original 1,800 pieces to about 3,000 pieces.

[0079] like Figure 8 As shown, after the strength of the insert seat 31 is increased, the mounting hole 312 on the upper surface is designed as an oblong hole to meet the arrangement of the push rods 32 of pistons 200 with different cylinder diameters, so as to improve the versatility of the insert seat 31.

[0080] Other structures and operations of the piston mold 100 according to the embodiment of the utility model are known to ordinary technicians in the field and will not be repeated here.

[0081] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0082] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A piston mold, characterized in that: include: A first mold and a second mold, wherein the first mold and the second mold are combined to form an inner cavity to process a piston; An ejection assembly is arranged on a side of the second mold away from the first mold, and the ejection assembly includes: an insert seat, an ejector rod and a support block, the support block is movably arranged on the insert seat, the support block is suitable for pushing the ejector rod to move along the ejection direction to extend into the inner cavity, so as to eject the piston located in the inner cavity through the ejector rod, the support block has a central area that cooperates with the ejector rod and an edge area outside the central area, and the matching clearance between the central area and the insert seat is smaller than the matching clearance between the edge area and the insert seat.

2. The piston mold according to claim 1, characterized in that: In the ejection direction, the projection profile of the support block includes: a main body portion, and two arc portions located on both sides of the main body portion and symmetrically arranged, the main body portion is configured as an oblong or rectangular shape, and the arc portions and at least part of the main body portion define the central area.

3. The piston mold according to claim 2, characterized in that: The center of the equivalent circle of the arc portion is located at the center of the main body portion.

4. The piston mold according to claim 1, characterized in that: The ejector rod comprises: a first rod portion cooperating with the support block, and a second rod portion at least partially extending into the inner cavity, wherein the projection contour of the second rod portion is within the projection contour range of the first rod portion in the ejection direction.

5. The piston mold according to claim 4, characterized in that: In the ejection direction, the projection profile of the second rod portion is an oblong or elliptical shape.

6. The piston mold according to claim 1, characterized in that: The insert seat is provided with a receiving groove, the support block is movably arranged in the receiving groove, and the groove depth of the receiving groove is smaller than the dimension of the insert seat in the ejection direction.

7. The piston mold according to claim 6, characterized in that: The sum of the size of the support block in the ejection direction and the movement stroke of the support block is less than or equal to the groove depth of the accommodating groove.

8. The piston mold according to claim 1, characterized in that: The ejection assembly further comprises an elastic member, the elastic member is elastically pushed between the support block and the second mold, and a mounting hole for accommodating the elastic member is arranged on the insert seat.

9. The piston mold according to claim 8, characterized in that: The mounting hole is configured as an oblong hole.

10. The piston mold according to claim 1, characterized in that: The first mold includes: a first mold sleeve and a first mold core, the second mold includes: a second mold sleeve and a second mold core, the first mold sleeve cooperates with the second mold sleeve, the first mold core cooperates with the second mold core, and the insert seat and the second mold core are opposite to each other in the ejection direction.

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