A special-shaped bolt forming die for automobile brake pump

Abstract

The utility model discloses a special-shaped bolt forming mold for automobile brake pump, including a first forming mold, a second forming mold and a third forming mold, wherein the first forming mold includes a first fixed mold, and the first fixed mold includes a first fixed mold body, a first mold material cavity axially penetrating and opened inside and connected to the first fixed mold body, a first forming cavity, a first ejector cavity and a first ejector movably arranged in the first ejector cavity. The utility model has three sets of molds, wherein the first forming mold is used for preliminary forming of the screw part, the second forming mold is used for forming the bolt fastening part, the arc part, the first chamfered structure and the truncated cone structure of the preliminary forming bolt head, and the third forming mold is used for further extruding the second chamfered structure of the bolt head top, the bolt head bottom and the screw end, and the three-step forming can avoid the situation of lack of material in the bolt, improve its structural strength and service life, and avoid the safety hazard caused by bolt deformation.

Description

Technical Field

[0001] The utility model relates to the technical field of molds, in particular to a special-shaped bolt forming mold for an automobile brake pump. Background Art

[0002] Bolts are a type of fastener consisting of a head and a screw (a cylinder with external threads). They are usually used in the fields of building, decoration, and construction. In actual production and life, in order to adapt to different environments and different fastening requirements, some special-shaped bolts are usually used. Special-shaped bolts retain the basic characteristics of bolts, but only make corresponding improvements to the local structure and shape to achieve specific functions.

[0003] like Figure 4 The figure shows a special-shaped bolt for fixing an automobile brake pump. The bolt 4 includes an integrally connected bolt head top 401, a bolt head bottom 402, a fastening portion 403, a screw rod 404, an arc portion 405 connecting the bolt head bottom 402 and the fastening portion 403, a first chamfer 406 connecting the fastening portion 403 and the screw rod 404, and a second chamfer 407 located at the end of the screw rod 404. The fastening portion 403 is composed of two symmetrically arranged protrusions 4031 and recessed portions 4032 on both sides of the protrusions 4031. The screw rod 404 of the bolt 4 is inserted into the prefabricated hole of the vehicle housing, and the other side is supplemented with a fastening nut to complete the fixation of the brake pump plate and the vehicle housing. The cooperation of the protrusions 4031 and the recessed portions 4032 can prevent the bolt 4 from loosening, thereby improving the anti-loosening effect.

[0004] Most of the existing processing methods for special-shaped bolts for automobile brake pumps are cold heading processes, which are usually divided into two steps. The first step is to cold head the screw part, and the second step is to cold head the bolt head and the fastening part. Since the bolt fastening part is a special-shaped structure, it is more complicated than the common cylindrical shape, so it is easy to have material shortage, cracking, deformation and the like during the forming process; there is also a method of combined mold injection molding to process the bolts. Due to the gap between the molds, this method is prone to burrs on the bolts after forming, and subsequent grinding is required, which has low production efficiency; the bolts need to be marked on the head during the processing process. The existing operation method is to use a marking machine to mark separately after the cold heading forming is completed, which leads to low processing efficiency and increased production costs. Utility Model Content

[0005] The utility model aims to overcome the shortcomings of the prior art and provide a special-shaped bolt forming die for an automobile brake pump.

[0006] To achieve the above purpose, the technical solution adopted by the utility model is: a special-shaped bolt forming mold for an automobile brake pump, the bolt includes an integrally connected bolt head top, a bolt head bottom, a fastening portion, a screw rod, an arc-shaped portion connecting the bolt head bottom and the fastening portion, a first chamfer connecting the fastening portion and the screw rod, and a second chamfer located at the end of the screw rod, the fastening portion includes a symmetrically arranged protrusion and a recessed portion, and is characterized in that it includes:

[0007] a first molding die, the first molding die comprising a first fixed die, the first fixed die comprising a first fixed die body, a first mold material cavity axially extending and connected to the first fixed die body, a first molding cavity, a first ejector cavity, and a first ejector movably disposed in the first ejector cavity, the first ejector comprising a first ejector head and a first ejector tail, the diameter of the first ejector head being greater than the diameter of the first ejector tail, the diameter of the first ejector tail being equal to the diameter of the first ejector cavity, the length of the first ejector tail being greater than the length of the first ejector cavity, the first ejector tail sliding in the first ejector cavity, and the first ejector head being located outside the first ejector cavity;

[0008] A second molding die, wherein the second molding die comprises a second fixed die, the second fixed die comprises a second fixed die body, a second fixed die cavity axially extending through the second fixed die body, and a second fixed die primary die barrel, a second fixed die secondary die barrel, and a second fixed die tertiary die barrel sequentially arranged in the second fixed die cavity, a second slot is provided on the second fixed die primary die barrel near the second fixed die secondary die barrel, the second fixed die secondary die barrel is inserted into the second slot, and the second fixed die tertiary die barrel and the second fixed die secondary die barrel are butted together;

[0009] The third molding mold, the third molding mold includes a third fixed mold, the third fixed mold includes a third fixed mold body, a third fixed mold cavity axially extending inside the third fixed mold body, and a third fixed mold first-level mold cylinder, a third fixed mold second-level mold cylinder and a third fixed mold third-level mold cylinder sequentially arranged inside the third fixed mold cavity, the third fixed mold first-level mold cylinder is provided with a third slot near the side of the third fixed mold second-level mold cylinder, the third fixed mold second-level mold cylinder is inserted into the third slot, and the second fixed mold third-level mold cylinder and the third fixed mold second-level mold cylinder are abutted together.

[0010] Preferably, the first molding mold also includes a first movable mold, the first movable mold includes a first movable mold body, a first movable mold cavity and a first pressure rod cavity axially penetrated and connected to the first movable mold body, a first slider movably arranged in the first movable mold cavity, and a first pressure rod movably arranged in the first pressure rod cavity, the first pressure rod includes a first pressure rod head and a first pressure rod tail, the diameter of the first pressure rod head is greater than the diameter of the first pressure rod tail, the length of the first pressure rod tail is greater than the length of the first pressure rod cavity, the diameter of the first movable mold cavity is greater than the diameter of the first pressure rod cavity, the diameter of the first movable mold cavity is equal to the diameter of the first movable mold cavity, the diameter of the first pressure rod tail is equal to the diameter of the first pressure rod cavity, the first slider and the first pressure rod are abutted together, the first slider and the first pressure rod head slide in the first movable mold cavity, and the first pressure rod tail slides in the first pressure rod cavity.

[0011] Preferably, the second molding mold also includes a second movable mold, which includes a second movable mold body, a second movable mold cavity and a second pressure rod cavity that are axially opened and connected inside the second movable mold body, a second slider movably arranged in the second movable mold cavity, and a second pressure rod movably arranged in the second pressure rod cavity, the second pressure rod includes a second pressure rod head and a second pressure rod tail, the diameter of the second pressure rod head is greater than the diameter of the second pressure rod tail, the length of the second pressure rod tail is greater than the length of the second pressure rod cavity, the diameter of the second movable mold cavity is greater than the diameter of the second pressure rod cavity, the diameter of the second movable mold cavity is equal to the diameter of the second movable mold cavity, the diameter of the second pressure rod tail is equal to the diameter of the second pressure rod cavity, the second slider and the second pressure rod are abutted together, the second slider and the second pressure rod head slide in the second movable mold cavity, and the second pressure rod tail slides in the second pressure rod cavity.

[0012] Preferably, the third molding mold further includes a third movable mold, the third movable mold includes a third movable mold body, a third movable mold cavity and a third pressure rod cavity which are axially through-opened and connected inside the third movable mold body, and a third slider movably arranged inside the third movable mold cavity, and a third pressure rod movably arranged in the third pressure rod cavity, the third movable mold cavity includes a third movable mold outer cavity and a third movable mold inner cavity which are connected, the diameter of the third movable mold outer cavity is larger than the diameter of the third movable mold inner cavity, and the diameter of the third movable mold inner cavity is larger than the diameter of the third pressure rod cavity; the third pressure rod includes a third pressure rod head and a third pressure rod tail, The diameter of the third pressure rod head is greater than the diameter of the third pressure rod tail, the length of the third pressure rod tail is greater than the length of the third pressure rod cavity, the diameter of the third slider is equal to the diameter of the third movable mold inner cavity, the diameter of the third pressure rod tail is equal to the diameter of the third pressure rod cavity, the third slider and the third pressure rod are abutted together, the total length of the third slider and the third pressure rod is less than the total length of the third movable mold cavity and the third pressure rod cavity, the third slider and the third pressure rod head slide in the third movable mold cavity, the third pressure rod tail slides in the third pressure rod cavity, and a marking boss is provided at the end of the third pressure rod tail.

[0013] Preferably, the second fixed mold also includes a second molding cavity, a second mold material cavity, a second ejector cavity and a second ejector, the second molding cavity is axially penetrated and opened inside the first-level mold cylinder of the second fixed mold and is connected with the second slot, the second mold material cavity is axially penetrated and opened inside the second-level mold cylinder of the second fixed mold, the second ejector cavity is axially penetrated and opened inside the third-level mold cylinder of the second fixed mold, the second ejector is movably arranged inside the second ejector cavity, the second molding cavity, the second mold material cavity and the second ejector cavity are connectable, the second ejector includes a second ejector head and a second ejector tail, the diameter of the second ejector head is larger than the diameter of the second ejector tail, the diameter of the second ejector tail is equal to the diameter of the second ejector cavity, the length of the second ejector tail is larger than the length of the second ejector cavity, the tail of the second ejector slides in the second ejector cavity, and the head of the second ejector is located outside the second ejector cavity.

[0014] Preferably, the third fixed mold further includes a third mold material cavity, a third molding cavity, a third ejector pin accommodating groove, a third ejector pin cavity and a third ejector pin. The third mold material cavity is axially through-opened inside the third fixed mold primary mold cylinder and is connected to the third slot. The third molding cavity and the third ejector pin accommodating groove are axially through-opened inside the third fixed mold secondary mold cylinder and are connected to each other. The third ejector pin cavity is axially through-opened inside the third fixed mold tertiary mold cylinder. The third ejector pin is movably arranged inside the third ejector pin cavity. The third molding cavity, the third push rod accommodating groove and the third push rod cavity are connectable, the third push rod comprises a third push rod head and a third push rod tail, the diameter of the third push rod head is larger than the diameter of the third push rod tail, the diameter of the third push rod tail is equal to the diameter of the third push rod cavity, the length of the third push rod tail is larger than the length of the third push rod cavity, the third push rod tail slides in the third push rod cavity, the end of the third push rod tail can extend into the third push rod accommodating groove, and the third push rod head is located outside the third push rod cavity.

[0015] Preferably, the second fixed mold cavity includes a second fixed mold outer cavity, a second exhaust cavity and a second fixed mold inner cavity which are connected to each other, the diameter of the second exhaust cavity is larger than the diameter of the second fixed mold inner cavity, the diameter of the second fixed mold inner cavity is larger than the diameter of the second fixed mold outer cavity, and a second exhaust hole is opened through the inside of the second exhaust cavity along the diameter direction, and the penetration direction of the second exhaust hole is perpendicular to the axial direction of the second fixed mold cavity.

[0016] Preferably, the third fixed mold cavity includes a third fixed mold outer cavity, a third exhaust cavity and a third fixed mold inner cavity which are connected to each other, the diameter of the third exhaust cavity is larger than the diameter of the third fixed mold inner cavity, the diameter of the third fixed mold inner cavity is larger than the diameter of the third fixed mold outer cavity, and a third exhaust hole is opened through the inside of the third exhaust cavity along the diameter direction, and the penetration direction of the third exhaust hole is perpendicular to the axial direction of the third fixed mold cavity.

[0017] Due to the application of the above technical solution, the utility model has the following advantages compared with the prior art:

[0018] The utility model has three sets of special-shaped bolt forming dies for automobile brake pumps, which are the first forming die, the second forming die and the third forming die in sequence. The first forming die is used for preliminarily forming the screw part, the second forming die is used for forming the bolt fastening part, the arc part, the first chamfered structure and the truncated cone structure of the preliminarily formed bolt head, and the third forming die is used for further extruding the second chamfered structure of the bolt head top, the bolt head bottom and the screw end. The forming is divided into three steps to avoid the situation of material shortage of the bolt, improve its structural strength and service life, and avoid the safety hazard caused by the deformation of the bolt; the third pressure rod tail end of the third movable die is provided with a marking boss for marking while forming the top of the bolt head, without the need for a separate marking operation later, thus simplifying the processing procedure and improving the production efficiency; the cold heading process is adopted for forming, and compared with the mold-jointing forming, there is no mold-jointing burr, and the efficiency is higher and fuller. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments 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 creative work.

[0020] Figure 1 is a schematic diagram of a bolt blank;

[0021] Figure 2 It is a schematic diagram of the first molding die of the utility model after molding;

[0022] Figure 3 It is a schematic diagram of the second molding die of the utility model after molding;

[0023] Figure 4 It is a schematic diagram of the third molding die of the utility model after molding;

[0024] Figure 5 It is a cross-sectional view of the first molding die of the utility model;

[0025] Figure 6 This is a cross-sectional view of the first fixed mold of the utility model after removing the first ejector rod;

[0026] Figure 7 This is a cross-sectional view of the first movable mold of the utility model after removing the first slider and the first pressure rod;

[0027] Figure 8 It is a schematic diagram of the first sliding block and the first pressing rod of the utility model;

[0028] Fig. 9 It is a cross-sectional view of the second molding die of the utility model;

[0029] Fig.10 It is a cross-sectional view of the second fixed mold of the utility model after removing the second fixed mold primary mold cylinder, the second fixed mold secondary mold cylinder, the second fixed mold tertiary mold cylinder and the second ejector pin;

[0030] Fig.11 It is a cross-sectional view of the first-level mold cylinder of the second fixed mold of the utility model;

[0031] Fig.12 It is a cross-sectional view of the second fixed mold secondary mold cylinder and the second fixed mold tertiary mold cylinder of the utility model;

[0032] Fig.13 This is a cross-sectional view of the second movable mold of the utility model after removing the second slider and the second pressure rod;

[0033] Fig.14 It is a schematic diagram of the second sliding block and the second pressing rod of the utility model;

[0034] Fig.15 It is a cross-sectional view of the third molding die of the utility model;

[0035] Fig.16 It is a cross-sectional view of the third fixed mold of the utility model after removing the third fixed mold primary mold cylinder, the third fixed mold secondary mold cylinder, the third fixed mold tertiary mold cylinder and the third ejector pin;

[0036] Fig.17 It is a cross-sectional view of the first-level mold cylinder of the third fixed mold of the utility model;

[0037] Fig.18 It is a cross-sectional view of the third fixed mold secondary mold cylinder and the third fixed mold tertiary mold cylinder of the utility model;

[0038] Fig.19 This is a cross-sectional view of the third movable mold of the utility model after removing the third slider and the third pressure rod;

[0039] Fig. 20 It is a schematic diagram of the third sliding block and the third pressing rod of the utility model;

[0040] Fig.21 For this utility model Fig. 20 Enlarged view of point A in the middle.

[0041] Description of reference numerals:

[0042] 1. First molding die; 11. First fixed die; 111. First fixed die body; 112. First mold cavity; 113. First molding cavity; 114. First ejector cavity; 115. First ejector; 1151. First ejector head; 1152. First ejector tail; 12. First movable die; 121. First movable die body; 122. First movable die cavity; 123. First pressure rod cavity; 124. First slider; 125. First pressure rod; 1251. First pressure rod head; 1252. First pressure rod tail;

[0043] 2. Second molding die; 21. Second fixed die; 211. Second fixed die main body; 212. Second fixed die cavity; 2121. Second fixed die outer cavity; 2122. Second exhaust cavity; 2123. Second fixed die inner cavity; 2124. Second exhaust hole; 213. Second fixed die primary die cylinder; 2131. Second slot; 2132. Second molding cavity; 214. Second fixed die secondary die cylinder; 215. Second fixed die tertiary die cylinder; 216. Second mold material cavity; 217. Second ejector pin cavity; 218. Second ejector pin; 2181. Second ejector pin head; 2182. Second ejector pin tail; 22. Second movable die; 221. Second movable die main body; 222. Second movable die cavity; 223. Second pressure pin cavity; 224. Second slider; 225. Second pressure pin; 2251. Second pressure pin head; 2252. Second pressure pin tail;

[0044] 3. The third molding die; 31. The third fixed die; 311. The third fixed die body; 312. The third fixed die cavity; 3121. The third fixed die outer cavity; 3122. The third exhaust cavity; 3123. The third fixed die inner cavity; 3124. The third exhaust hole; 313. The third fixed die primary die cylinder; 3131. The third slot; 3132. The third mold material cavity; 314. The third fixed die secondary die cylinder; 315. The third fixed die tertiary die cylinder; 316. The third molding cavity; 317. The third ejector pin Accommodating groove; 318, third ejector cavity; 319, third ejector; 3191, third ejector head; 3192, third ejector tail; 32, third movable mold; 321, third movable mold body; 322, third movable mold cavity; 3221, third movable mold outer cavity; 3222, third movable mold inner cavity; 323, third pressure rod cavity; 324, third slider; 325, third pressure rod; 3251, third pressure rod head; 3252, third pressure rod tail; 3253, marking boss;

[0045] 4. Bolt; 401. Top of bolt head; 402. Bottom of bolt head; 403. Fastening portion; 4031. Raised portion; 4032. Recessed portion; 404. Screw; 405. Arc-shaped portion; 406. First chamfer; 407. Second chamfer. DETAILED DESCRIPTION

[0046] In order to enable those skilled in the art to better understand the solution of the utility model, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is only a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.

[0047] In the following description, for the sake of clarity and simplicity, not all of the multiple components shown in the figures are described. The multiple components shown in the drawings provide a fully practicable disclosure of the present invention to those of ordinary skill in the art. For those of ordinary skill in the art, the operation of many components is familiar and obvious.

[0048] like Figure 4 As shown, it is a schematic diagram of the structure of the bolt 4, which is usually used to fix the automobile brake pump on the vehicle housing to prevent the brake pump from loosening during the driving of the vehicle. The bolt 4 includes an integrally connected bolt head top 401, a bolt head bottom 402, a fastening portion 403, a screw rod 404, an arc portion 405 connecting the bolt head bottom 402 and the fastening portion 403, a first chamfer 406 connecting the fastening portion 403 and the screw rod 404, and a second chamfer 407 at the end of the screw rod 404. The fastening portion 403 is composed of two symmetrically arranged protrusions 4031 and recessed portions 4032 on both sides of the protrusions 4031. The screw rod 404 of the bolt 4 is inserted into the prefabricated hole of the vehicle housing, and the other side is supplemented with a fastening nut to complete the fixing of the brake pump plate and the vehicle housing. With the cooperation of the protrusions 4031 and the recessed portions 4032, the bolt 4 can be prevented from loosening, thereby improving the anti-loosening effect.

[0049] The utility model has three sets of molding dies, which are the first molding die 1, the second molding die 2 and the third molding die 3. The first molding die 1 is used to Figure 1 The billet shown is extruded into Figure 2 The structure shown in the figure is that a part with a smaller diameter is extruded at one end of the cylindrical blank, and the part is the screw rod 404 of the bolt 4; the second forming die 2 is used to Figure 2 The structure shown is extruded into Figure 3 The semi-finished product structure shown in the figure, that is, the fastening portion 403, the arc portion 405 and the first chamfer 406 connecting the fastening portion 403 and the screw 404 are extruded on one side of the screw 404, and the truncated cone structure of the bolt head is preliminarily formed; the third molding die 3 is used to Figure 3 The semi-finished structure shown is extruded into Figure 4 The finished bolt 4 structure shown is Figure 3The truncated cone structure is extruded into a bolt head top 401 and a bolt head bottom 402, and at the same time, a second chamfer 407 is extruded at the end of the screw rod 404, thereby completing the overall forming work of the bolt 4.

[0050] like Figure 5-8 The first molding die 1 is a schematic structural diagram of the first molding die 1. Figure 1 The billet shown is extruded into Figure 2 The structure shown is that a part with a smaller diameter is extruded at one end of the cylindrical blank, and the part is the screw rod 404 of the bolt 4. The first molding die 1 includes a first fixed die 11 and a first movable die 12. The first fixed die 11 includes a first fixed die body 111, a first die cavity 112 axially extending and connected to the first fixed die body 111, a first molding cavity 113, a first ejector cavity 114, and a first ejector 115 movably arranged in the first ejector cavity 114. The first ejector 115 includes a first ejector head 1151 and a first ejector tail 1152. The diameter of the first ejector head 1151 is larger than the diameter of the first ejector tail 1152. The diameter of the first ejector tail 1152 is equal to the diameter of the first ejector cavity 114. The length of the first ejector tail 1152 is larger than the length of the first ejector cavity 114. The first ejector tail 1152 slides in the first ejector cavity 114, and the first ejector head 1151 is located outside the first ejector cavity 114.

[0051] The first movable mold 12 includes a first movable mold body 121, a first movable mold cavity 122 and a first pressure rod cavity 123 that are axially connected and opened inside the first movable mold body 121, a first slider 124 that is movably arranged in the first movable mold cavity 122, and a first pressure rod 125 that is movably arranged in the first pressure rod cavity 123. The first pressure rod 125 includes a first pressure rod head 1251 and a first pressure rod tail 1252. The diameter of the first pressure rod head 1251 is larger than the diameter of the first pressure rod tail 1252. The diameter of a pressure rod tail 1252 is equal to the diameter of the first pressure rod cavity 123, the length of the first pressure rod tail 1252 is greater than the length of the first pressure rod cavity 123, the diameter of the first movable mold cavity 122 is greater than the diameter of the first pressure rod cavity 123, the diameter of the first slider 124 is equal to the diameter of the first movable mold cavity 122, the first slider 124 and the first pressure rod 125 are abutted together, the first slider 124 and the first pressure rod head 1251 slide in the first movable mold cavity 122, and the first pressure rod tail 1252 slides in the first pressure rod cavity 123.

[0052] When in use, the bolt blank is placed in the first mold cavity 112, and the first slider 124 and the first pressure rod 125 are placed in the first movable mold cavity 122, and pressure is applied to the first slider 124. The first slider 124 drives the first pressure rod head 1251 to slide in the first movable mold cavity 122, thereby driving the first pressure rod tail 1252 to slide in the first pressure rod cavity 123. Since the diameter of the first slider 124 is equal to the diameter of the first movable mold cavity 122, and the diameter of the first pressure rod tail 1252 is equal to the diameter of the first pressure rod cavity 123, the first slider 124 and the first pressure rod 125 can stably slide in the first movable mold cavity 122 and the first pressure rod cavity 123 without shaking left and right; since the diameter of the first pressure rod head 1251 is larger than the diameter of the first pressure rod tail 1252, when sliding During the movement, the first pressure rod head 1251 abuts against the bottom of the inner wall of the first movable mold cavity 122 to play a limiting role; since the length of the first pressure rod tail 1252 is greater than the length of the first pressure rod cavity 123, the first pressure rod tail 1252 extends out of the first pressure rod cavity 123 and enters the first mold cavity 112 to extrude the bolt blank, and the bolt blank forms a screw 404 in the first forming cavity 113; after completion, the first ejector rod head 1151 is pushed to drive the first ejector rod tail 1152 to slide in the first ejector rod cavity 114. Since the length of the first ejector rod tail 1152 is greater than the length of the first ejector rod cavity 114, the first ejector rod tail 1152 extends out of the first ejector rod cavity 114 and enters the first forming cavity 113 to eject the formed bolt blank out of the first mold cavity 112, thereby obtaining the following Figure 2 The structure shown; since the diameter of the first push rod head 1151 is larger than the diameter of the first push rod tail 1152, and the diameter of the first push rod tail 1152 is equal to the diameter of the first push rod cavity 114, it can be avoided that the first push rod head 1151 enters the first push rod cavity 114 during the process of pushing the first push rod 115 and is difficult to remove.

[0053] like Figure 9-14 The second molding die 2 is a schematic structural diagram of the second molding die 2. Figure 2 The structure shown is extruded into Figure 3The semi-finished product structure shown is that a fastening portion 403, an arc portion 405 and a first chamfer 406 connecting the fastening portion 403 and the screw rod 404 are extruded on one side of the screw rod 404, and a truncated cone structure of the bolt head is preliminarily formed. The second molding mold 2 includes a second fixed mold 21 and a second movable mold 22. The second fixed mold 21 includes a second fixed mold body 211, a second fixed mold cavity 212 axially extending inside the second fixed mold body 211, and a second fixed mold first-level mold cylinder 213, a second fixed mold second-level mold cylinder 214 and a second fixed mold third-level mold cylinder 215 sequentially arranged inside the second fixed mold cavity 212. The second fixed mold cavity 212 includes a second fixed mold outer cavity 2121, a second exhaust cavity 2122 and a second fixed mold inner cavity 2123 which are connected to each other. The diameter of the second exhaust cavity 2122 is larger than the diameter of the second fixed mold inner cavity 2123, and the diameter of the second fixed mold inner cavity 2123 is larger than the diameter of the second fixed mold outer cavity 2121. A second exhaust hole 2124 is provided inside the second exhaust cavity 2122 along the diameter direction, and the penetration direction of the second exhaust hole 2124 is perpendicular to the axial direction of the second fixed mold cavity 212. The second fixed mold first-stage mold cylinder 213 is provided with a second slot 2131 on one side close to the second fixed mold second-stage mold cylinder 214, and a second molding cavity 2132 connected with the second slot 2131 is provided on the other side, and a second exhaust cavity 2122 is provided at a position close to the entrance of the second molding cavity 2132; the second fixed mold second-stage mold cylinder 214 is inserted into the second slot 2131, and a second mold material cavity 216 is axially penetrated inside the second fixed mold second-stage mold cylinder 214; a second ejector cavity 217 is axially penetrated inside the second fixed mold third-stage mold cylinder 215, and a movable second ejector 218 is arranged inside the second ejector cavity 217, and the second ejector 218 is movable inside the second ejector 218. 8 includes a second push rod head 2181 and a second push rod tail 2182, the diameter of the second push rod head 2181 is larger than the diameter of the second push rod tail 2182, the diameter of the second push rod tail 2182 is equal to the diameter of the second push rod cavity 217, the length of the second push rod tail 2182 is larger than the length of the second push rod cavity 217, the second push rod tail 2182 slides in the second push rod cavity 217, and the second push rod head 2181 is located outside the second push rod cavity 217; the second fixed mold third-level mold cylinder 215 and the second fixed mold second-level mold cylinder 214 are abutted together, and the second molding cavity 2132, the second mold material cavity 216 and the second push rod cavity 217 can be connected.

[0054] The second movable mold 22 includes a second movable mold body 221, a second movable mold cavity 222 and a second pressure rod cavity 223 that are axially connected and opened inside the second movable mold body 221, a second slider 224 that is movably arranged in the second movable mold cavity 222, and a second pressure rod 225 that is movably arranged in the second pressure rod cavity 223. The second pressure rod 225 includes a second pressure rod head 2251 and a second pressure rod tail 2252. The diameter of the second pressure rod head 2251 is larger than the diameter of the second pressure rod tail 2252. The diameter of the second pressure rod tail 2252 is equal to the diameter of the second pressure rod cavity 223, the length of the second pressure rod tail 2252 is greater than the length of the second pressure rod cavity 223, the diameter of the second movable mold cavity 222 is greater than the diameter of the second pressure rod cavity 223, the diameter of the second slider 224 is equal to the diameter of the second movable mold cavity 222, the second slider 224 and the second pressure rod 225 are abutted together, the second slider 224 and the second pressure rod head 2251 slide in the second movable mold cavity 222, and the second pressure rod tail 225 slides in the second pressure rod cavity 223.

[0055] When in use, the bolt blank processed by the first forming mold 1 is placed in the second forming cavity 2132, and the second slider 224 and the second pressure rod 225 are placed in the second movable mold cavity 222, and pressure is applied to the second slider 224. The second slider 224 drives the second pressure rod head 2251 to slide in the second movable mold cavity 222, thereby driving the second pressure rod tail 2252 to slide in the second pressure rod cavity 223. Since the diameter of the second slider 224 is equal to the diameter of the second movable mold cavity 222, the diameter of the second pressure rod tail 2252 is equal to the diameter of the second pressure rod cavity 223. Therefore, the second slider 224 and the second pressure rod 225 can stably slide in the second movable mold cavity 222 and the second pressure rod cavity 223 without shaking left and right; since the diameter of the second pressure rod head 2251 is larger than the diameter of the second pressure rod tail 2252, the second pressure rod head 2251 abuts against the bottom of the inner wall of the second movable mold cavity 222 during the sliding process, playing a limiting role; since the length of the second pressure rod tail 2252 is larger than the length of the second pressure rod cavity 223, the part of the second pressure rod tail 2252 extending out of the second pressure rod cavity 223 enters the second molding cavity 2132 The bolt blank is extruded, and the formed screw 404 part of the bolt blank is extruded into the second die cavity 216. The remaining blank forms a fastening portion 403, an arc portion 405, a first chamfer 406 connecting the fastening portion 403 and the screw 404, and a preliminarily formed bolt head truncated cone structure in the second forming cavity 2132. Since a second exhaust cavity 2122 is provided at the entrance of the second forming cavity 2132, and an exhaust hole 2124 is provided on the inner wall of the second exhaust cavity 2122, the tail portion 2252 of the second pressure rod is formed in the second forming cavity during the extrusion process. The air in 2132 can be discharged in time through the second exhaust hole 2124 to avoid the situation that the air pressure in the second molding cavity 2132 is too high and causes the bolt blank to deform; after completion, the second ejector head 2181 is pushed to drive the second ejector tail 2182 to slide in the second ejector cavity 217. Since the length of the second ejector tail 2182 is greater than the length of the second ejector cavity 217, the part of the second ejector tail 2182 extending out of the second ejector cavity 217 enters the second mold cavity 216 to eject the formed bolt semi-finished product out of the second molding cavity 2132, thereby obtaining the following Figure 3 The structure shown; since the diameter of the second push rod head 2181 is larger than the diameter of the second push rod tail 2182, and the diameter of the second push rod tail 2182 is equal to the diameter of the second push rod cavity 217, it can be avoided that the second push rod head 2181 enters the second push rod cavity 217 and is difficult to remove during the process of pushing the second push rod 218.

[0056] like Figure 15-21 The third molding die 3 is a schematic structural diagram of the third molding die 3. Figure 3 The semi-finished structure shown is extruded into Figure 4 The finished bolt 4 structure shown is Figure 3The truncated cone structure is extruded into a bolt head top 401 and a bolt head bottom 402, and at the same time, a second chamfer 407 is extruded at the end of the screw rod 404, thereby completing the overall forming work of the bolt 4. The third molding mold 3 includes a third fixed mold 31 and a third movable mold 32. The third fixed mold 31 includes a third fixed mold body 311, a third fixed mold cavity 312 axially extending inside the third fixed mold body 311, and a third fixed mold first-level mold cylinder 313, a third fixed mold second-level mold cylinder 314 and a third fixed mold third-level mold cylinder 315 sequentially arranged inside the third fixed mold cavity 312. The third fixed mold cavity 312 includes a third fixed mold outer cavity 3121, a third exhaust cavity 3122 and a third fixed mold inner cavity 3123 which are connected to each other. The diameter of the third exhaust cavity 3122 is larger than that of the third fixed mold inner cavity 3123. The diameter of the third fixed mold inner cavity 3123 is larger than that of the third fixed mold outer cavity 3121. A third exhaust hole 3124 is provided inside the third exhaust cavity 3122 along the diameter direction. The penetration direction of the third exhaust hole 3124 is perpendicular to the axial direction of the third fixed mold cavity 312. The third fixed mold first-stage mold cylinder 313 is provided with a third slot 3131 on one side close to the third fixed mold second-stage mold cylinder 314, and a third mold cavity 3132 connected with the third slot 3131 is provided on the other side, and a third exhaust cavity 3122 is provided at a position close to the entrance of the third mold cavity 3132; the third fixed mold second-stage mold cylinder 314 is inserted into the third slot 3131, and a third molding cavity 316 and a third ejector accommodating groove 317 are axially penetrated inside the third fixed mold second-stage mold cylinder 314; a third ejector cavity 318 is axially penetrated inside the third fixed mold third-stage mold cylinder 315, and a movable third ejector 319 is arranged inside the third ejector cavity 318, and the third ejector 319 includes a third ejector head 319. 1 and the third push rod tail 3192, the diameter of the third push rod head 3191 is larger than the diameter of the third push rod tail 3192, the diameter of the third push rod tail 3192 is equal to the diameter of the third push rod cavity 318, the length of the third push rod tail 3192 is larger than the length of the third push rod cavity 318, the third push rod tail 3192 slides in the third push rod cavity 318, the end of the third push rod tail 3192 can extend into the third push rod accommodating groove 317, and the third push rod head 3191 is located outside the third push rod cavity 318; the third fixed mold third-level mold cylinder 315 and the third fixed mold second-level mold cylinder 314 are abutted together, and the third mold material cavity 3132, the third molding cavity 316, the third push rod accommodating groove 317 and the third push rod cavity 318 can be connected.

[0057] The third movable mold 32 includes a third movable mold body 321, a third movable mold cavity 322 and a third pressure rod cavity 323 which are axially opened and connected inside the third movable mold body 321, a third slider 324 movably arranged inside the third movable mold cavity 322, and a third pressure rod 325 movably arranged in the third pressure rod cavity 323, the third pressure rod 325 includes a third pressure rod head 3251 and a third pressure rod tail 3252, the diameter of the third pressure rod head 3251 is larger than the diameter of the third pressure rod tail 3252, the diameter of the third pressure rod tail 3252 is equal to the diameter of the third pressure rod cavity 323, and the length of the third pressure rod tail 3252 is larger than the length of the third pressure rod cavity 323. The third movable mold cavity 322 includes a third movable mold outer cavity 3221 and a third movable mold inner cavity 3222 which are connected to each other. The diameter of the third movable mold outer cavity 3221 is larger than the diameter of the third movable mold inner cavity 3222. The diameter of the third movable mold inner cavity 3222 is larger than the diameter of the third pressure rod cavity 323. The diameter of the third slider 324 is equal to the diameter of the third movable mold inner cavity 3222. The third slider 324 and the third pressure rod 325 are abutted together. The total length of the third slider 324 and the third pressure rod 325 is smaller than the total length of the third movable mold cavity 322 and the third pressure rod cavity 323. The third slider 324 and the third pressure rod head 3251 slide in the third movable mold cavity 322. The third pressure rod tail 3252 slides in the third pressure rod cavity 323. A marking boss 3253 is provided at the end of the third pressure rod tail 3252.

[0058] When in use, the semi-finished bolt product processed by the second molding die 2 is placed in the third mold cavity 3132, and the third slider 324 and the third pressure rod 325 are placed in the third movable mold cavity 322, and pressure is applied to the third slider 324. The third slider 324 drives the third pressure rod head 3251 to slide in the third movable mold cavity 322, thereby driving the third pressure rod tail 3252 to slide in the third pressure rod cavity 323. Since the diameter of the third slider 324 is equal to the diameter of the third movable mold cavity 3222, the third pressure rod tail 3252 The diameter is equal to the diameter of the third pressure rod cavity 323, so the third slider 324 and the third pressure rod 325 can stably slide in the third movable mold cavity 322 and the third pressure rod cavity 323 without shaking left and right; because the total length of the third slider 324 and the third pressure rod 325 is less than the total length of the third movable mold cavity 322 and the third pressure rod cavity 323, a part of the space is reserved in the third pressure rod cavity 323 to accommodate the truncated cone structure of the bolt head, and the third pressure rod tail 3252 extrude the truncated cone structure, and the bolt blank has been formed. The screw rod 404 is extruded into a second chamfer 407 in the third molding cavity 316, a portion of the truncated cone structure of the bolt head forms a bolt head top 401 in the third pressure rod cavity 323, and another portion forms a bolt head top 402 in the third mold cavity 3132. Since a third exhaust cavity 3122 is provided at the entrance of the third mold cavity 3132, and a third exhaust hole 3124 is provided on the inner wall of the third exhaust cavity 3122, the air in the third mold cavity 3132 can pass through the third pressure rod tail 3252 during the extrusion process. The third push rod head 3191 is pushed after completion to drive the third push rod tail 3192 to slide in the third push rod cavity 318. Since the length of the third push rod tail 3192 is greater than the length of the third push rod cavity 318, the part of the third push rod tail 3192 extending out of the third push rod cavity 318 enters the third push rod accommodating groove 317 to push the formed bolt out of the third mold cavity 3132, thereby obtaining the following Figure 4 The finished bolt is shown; since the diameter of the third push rod head 3191 is larger than the diameter of the third push rod tail 3192, and the diameter of the third push rod tail 3191 is equal to the diameter of the third push rod cavity 318, it can be avoided that the third push rod head 3191 enters the third push rod cavity 318 and is difficult to remove during the process of pushing the third push rod 319; since the end of the third pressure rod tail 3252 is provided with a marking boss 3253, the marking process can be directly performed while the third pressure rod tail 3252 squeezes the bolt blank to form the bolt head top 401, and there is no need for a subsequent separate marking operation, which simplifies the processing process and improves production efficiency.

[0059] The forming process of the special-shaped bolt forming die for the automobile brake pump of the utility model is as follows:

[0060] The utility model has three sets of molding dies, which are the first molding die 1, the second molding die 2 and the third molding die 3. The first molding die 1 is used to Figure 1 The billet shown is extruded into Figure 2 The structure shown in the figure is that a part with a smaller diameter is extruded at one end of the cylindrical blank, and the part is the screw rod 404 of the bolt 4; the second forming die 2 is used to Figure 2 The structure shown is extruded into Figure 3 The semi-finished product structure shown in the figure, that is, the fastening portion 403, the arc portion 405 and the first chamfer 406 connecting the fastening portion 403 and the screw 404 are extruded on one side of the screw 404, and the truncated cone structure of the bolt head is preliminarily formed; the third molding die 3 is used to Figure 3 The semi-finished structure shown is extruded into Figure 4 The finished bolt 4 structure shown is Figure 3 The truncated cone structure is extruded into a bolt head top 401 and a bolt head bottom 402, and at the same time, a second chamfer 407 is extruded at the end of the screw rod 404, thereby completing the overall forming work of the bolt 4.

[0061] The above embodiments are only for illustrating the technical concept and features of the utility model, and their purpose is to enable people familiar with the technology to understand the content of the utility model and implement it accordingly, and they cannot be used to limit the protection scope of the utility model. Any equivalent changes or modifications made according to the spirit of the utility model should be included in the protection scope of the utility model.

Claims

1. A special-shaped bolt forming mold for an automobile brake pump, wherein the bolt (4) comprises an integrally connected bolt head top (401), a bolt head bottom (402), a fastening portion (403), a screw rod (404), an arcuate portion (405) connecting the bolt head bottom (402) and the fastening portion (403), a first chamfer (406) connecting the fastening portion (403) and the screw rod (404), and a second chamfer (407) located at the end of the screw rod (404), wherein the fastening portion (403) comprises a symmetrically arranged protrusion (4031) and a recessed portion (4032), characterized in that: It includes: A first molding die (1), the first molding die (1) comprising a first fixed die (11), the first fixed die (11) comprising a first fixed die body (111), a first mold material cavity (112) axially extending and connected to the first fixed die body (111), a first molding cavity (113), a first ejector cavity (114), and a first ejector (115) movably disposed in the first ejector cavity (114), the first ejector (115) comprising a first ejector head (1151) and a first ejector head (1152). a push rod tail (1152); the diameter of the first push rod head (1151) is larger than the diameter of the first push rod tail (1152); the diameter of the first push rod tail (1152) is equal to the diameter of the first push rod cavity (114); the length of the first push rod tail (1152) is larger than the length of the first push rod cavity (114); the first push rod tail (1152) slides in the first push rod cavity (114); and the first push rod head (1151) is located outside the first push rod cavity (114); A second molding die (2), wherein the second molding die (2) comprises a second fixed die (21), the second fixed die (21) comprises a second fixed die body (211), a second fixed die cavity (212) axially extending through the second fixed die body (211), and a second fixed die primary die barrel (213), a second fixed die secondary die barrel (214) and a second fixed die tertiary die barrel (215) sequentially arranged in the second fixed die cavity (212), a second fixed die primary die barrel (213) being provided with a second slot (2131) on one side of the second fixed die secondary die barrel (214), the second fixed die secondary die barrel (214) being inserted into the second slot (2131), and the second fixed die tertiary die barrel (215) and the second fixed die secondary die barrel (214) being abutted against each other; A third molding mold (3), wherein the third molding mold (3) comprises a third fixed mold (31), wherein the third fixed mold (31) comprises a third fixed mold body (311), a third fixed mold cavity (312) axially extending through the third fixed mold body (311), and a third fixed mold primary mold cylinder (313), a third fixed mold secondary mold cylinder (314) and a third fixed mold tertiary mold cylinder (315) sequentially arranged in the third fixed mold cavity (312), wherein a third slot (3131) is provided on one side of the third fixed mold primary mold cylinder (313) close to the third fixed mold secondary mold cylinder (314), the third fixed mold secondary mold cylinder (314) is inserted into the third slot (3131), and the third fixed mold tertiary mold cylinder (315) and the third fixed mold secondary mold cylinder (314) are abutted against each other.

2. The special-shaped bolt forming die for automobile brake pump according to claim 1, characterized in that: The first molding die (1) further comprises a first movable die (12), the first movable die (12) comprising a first movable die body (121), a first movable die cavity (122) and a first pressure rod cavity (123) which are axially connected and opened inside the first movable die body (121), a first slider (124) movably arranged in the first movable die cavity (122), and a first pressure rod (125) movably arranged in the first pressure rod cavity (123), the first pressure rod (125) comprising a first pressure rod head (1251) and a first pressure rod tail (1252), the diameter of the first pressure rod head (1251) being larger than the diameter of the first pressure rod tail (1252). , the length of the first pressure rod tail (1252) is greater than the length of the first pressure rod cavity (123), the diameter of the first movable mold cavity (122) is greater than the diameter of the first pressure rod cavity (123), the diameter of the first slider (124) is equal to the diameter of the first movable mold cavity (122), the diameter of the first pressure rod tail (1252) is equal to the diameter of the first pressure rod cavity (123), the first slider (124) and the first pressure rod (125) are abutted together, the first slider (124) and the first pressure rod head (1251) slide in the first movable mold cavity (122), and the first pressure rod tail (1252) slides in the first pressure rod cavity (123).

3. The special-shaped bolt forming die for automobile brake pump according to claim 1, characterized in that: The second molding die (2) further comprises a second movable die (22), the second movable die (22) comprising a second movable die body (221), a second movable die cavity (222) and a second pressure rod cavity (223) which are axially connected and opened inside the second movable die body (221), a second slider (224) movably arranged in the second movable die cavity (222), and a second pressure rod (225) movably arranged in the second pressure rod cavity (223), the second pressure rod (225) comprising a second pressure rod head (2251) and a second pressure rod tail (2252), the diameter of the second pressure rod head (2251) being larger than the diameter of the second pressure rod tail (2252). , the length of the second pressure rod tail (2252) is greater than the length of the second pressure rod cavity (223), the diameter of the second movable mold cavity (222) is greater than the diameter of the second pressure rod cavity (223), the diameter of the second slider (224) is equal to the diameter of the second movable mold cavity (222), the diameter of the second pressure rod tail (2252) is equal to the diameter of the second pressure rod cavity (223), the second slider (224) and the second pressure rod (225) are abutted together, the second slider (224) and the second pressure rod head (2251) slide in the second movable mold cavity (222), and the second pressure rod tail (2252) slides in the second pressure rod cavity (223).

4. The special-shaped bolt forming die for automobile brake pump according to claim 1, characterized in that: The third molding die (3) further comprises a third movable die (32), wherein the third movable die (32) comprises a third movable die body (321), a third movable die cavity (322) and a third pressure rod cavity (323) which are axially connected and opened inside the third movable die body (321), a third slider (324) which is movably arranged inside the third movable die cavity (322), and a third pressure rod (325) which is movably arranged inside the third pressure rod cavity (323). ), the third movable mold cavity (322) includes a third movable mold outer cavity (3221) and a third movable mold inner cavity (3222) which are connected to each other, the diameter of the third movable mold outer cavity (3221) is larger than the diameter of the third movable mold inner cavity (3222), and the diameter of the third movable mold inner cavity (3222) is larger than the diameter of the third pressure rod cavity (323); the third pressure rod (325) includes a third pressure rod head (3251) and a third pressure rod tail (3252), and the third pressure rod (3251) is larger than the third pressure rod tail (3252). The diameter of the rod head (3251) is greater than the diameter of the third pressure rod tail (3252), the length of the third pressure rod tail (3252) is greater than the length of the third pressure rod cavity (323), the diameter of the third slider (324) is equal to the diameter of the third movable mold inner cavity (3222), the diameter of the third pressure rod tail (3252) is equal to the diameter of the third pressure rod cavity (323), the third slider (324) and the third pressure rod (325) are in contact with each other, The total length of the third slider (324) and the third pressure rod (325) is smaller than the total length of the third movable mold cavity (322) and the third pressure rod cavity (323); the third slider (324) and the third pressure rod head (3251) slide in the third movable mold cavity (322); the third pressure rod tail (3252) slides in the third pressure rod cavity (323); and a marking boss (3253) is provided at the end of the third pressure rod tail (3252).

5. The special-shaped bolt forming die for automobile brake pump according to claim 1, characterized in that: The second fixed mold (21) further comprises a second molding cavity (2132), a second mold material cavity (216), a second ejector cavity (217) and a second ejector (218); the second molding cavity (2132) is axially through-opened inside the second fixed mold primary mold cylinder (213) and is in communication with the second slot (2131); the second mold material cavity (216) is axially through-opened inside the second fixed mold secondary mold cylinder (214); the second ejector cavity (217) is axially through-opened inside the second fixed mold tertiary mold cylinder (215); the second ejector (218) is movably arranged inside the second ejector cavity (217); the second molding cavity (2132) , the second mold cavity (216) and the second ejector pin cavity (217) are communicable, the second ejector pin (218) comprises a second ejector pin head (2181) and a second ejector pin tail (2182), the diameter of the second ejector pin head (2181) is greater than the diameter of the second ejector pin tail (2182), the diameter of the second ejector pin tail (2182) is equal to the diameter of the second ejector pin cavity (217), the length of the second ejector pin tail (2182) is greater than the length of the second ejector pin cavity (217), the second ejector pin tail (2182) slides in the second ejector pin cavity (217), and the second ejector pin head (2181) is located outside the second ejector pin cavity (217).

6. The special-shaped bolt forming die for automobile brake pump according to claim 1, characterized in that: The third fixed mold (31) further comprises a third mold material cavity (3132), a third molding cavity (316), a third ejector pin accommodating groove (317), a third ejector pin cavity (318) and a third ejector pin (319); the third mold material cavity (3132) is axially through-opened in the third fixed mold primary mold cylinder (313) and is in communication with the third slot (3131); the third molding cavity (316) and the third ejector pin accommodating groove (317) are axially through-opened in the third fixed mold secondary mold cylinder (314) and are in communication with each other; the third ejector pin cavity (318) is axially through-opened in the third fixed mold tertiary mold cylinder (315); the third ejector pin (319) is movably arranged in the third ejector pin cavity (318); the third mold material cavity (3132), the third molding cavity ( 316), the third push rod receiving groove (317) and the third push rod cavity (318) are connectable, the third push rod (319) comprises a third push rod head (3191) and a third push rod tail (3192), the diameter of the third push rod head (3191) is larger than the diameter of the third push rod tail (3192), the diameter of the third push rod tail (3192) is equal to the diameter of the third push rod cavity (318), the length of the third push rod tail (3192) is larger than the length of the third push rod cavity (318), the third push rod tail (3192) slides in the third push rod cavity (318), the end of the third push rod tail (3192) can extend into the third push rod receiving groove (317), and the third push rod head (3191) is located outside the third push rod cavity (318).

7. The special-shaped bolt forming die for automobile brake pump according to claim 1, characterized in that: The second fixed mold cavity (212) comprises a second fixed mold outer cavity (2121), a second exhaust cavity (2122) and a second fixed mold inner cavity (2123) which are connected to each other, the diameter of the second exhaust cavity (2122) is larger than the diameter of the second fixed mold inner cavity (2123), the diameter of the second fixed mold inner cavity (2123) is larger than the diameter of the second fixed mold outer cavity (2121), and a second exhaust hole (2124) is provided in the second exhaust cavity (2122) along the diameter direction, and the penetration direction of the second exhaust hole (2124) is perpendicular to the axial direction of the second fixed mold cavity (212).

8. The special-shaped bolt forming die for automobile brake pump according to claim 1, characterized in that: The third fixed mold cavity (312) comprises a third fixed mold outer cavity (3121), a third exhaust cavity (3122) and a third fixed mold inner cavity (3123) which are connected to each other. The diameter of the third exhaust cavity (3122) is larger than the diameter of the third fixed mold inner cavity (3123). The diameter of the third fixed mold inner cavity (3123) is larger than the diameter of the third fixed mold outer cavity (3121). A third exhaust hole (3124) is provided in the interior of the third exhaust cavity (3122) along the diameter direction. The penetration direction of the third exhaust hole (3124) is perpendicular to the axial direction of the third fixed mold cavity (312).

Images