Ball pin pouring mold and ball pin pouring method

Abstract

The invention discloses a ball stud pouring mold which comprises a first half cavity, a second half cavity, a third half cavity, a fourth half cavity, a first cavity positioning plate, a second cavity positioning plate, a third cavity positioning plate, a fourth cavity positioning plate, a third cavity positioning plate, a fourth cavity positioning plate, a third cavity positioning plate and a fourth cavity positioning plate. The first cavity positioning plate, the second cavity positioning plate, the first half cavity, the second half cavity, the third half cavity and the fourth half cavity define a pouring cavity of the ball pin; two ends of the first stop pin are respectively inserted into the first half cavity and the third half cavity, and two ends of the second stop pin are respectively inserted into the second half cavity and the fourth half cavity; the first half cavity, the second half cavity, the third half cavity and the fourth half cavity are each provided with a plurality of magnets. According to the mold, a brand new design mode is adopted, casting molding of polyurethane of the ball pin with various parts is achieved, a closed casting mode is adopted, and the technical problems in the background technology are solved.

Description

Technical Field

[0001] This invention relates to the field of ball head pin manufacturing technology, specifically to a ball head pin casting mold and a ball head pin casting method. Background Technology

[0002] In heavy-duty truck chassis systems, ball joints are critical motion connectors that need to precisely transmit complex tensile, compressive, and torsional loads during multi-directional rotation. To meet the stringent requirements of heavy-duty trucks for load-bearing capacity, wear resistance, and dynamic stiffness, the use of high-performance cast polyurethane elastomers to replace traditional rubber in ball joint manufacturing has become a clear technological trend.

[0003] Currently, cast polyurethane products are typically molded using an open mold casting process. This process has the following two shortcomings, which restrict product performance and production efficiency:

[0004] 1. Air bubble defects are difficult to avoid: After casting, the polyurethane raw material cures under no pressure. Air trapped during the casting process and air in narrow parts of the mold cavity cannot be effectively discharged, easily forming defects such as air bubbles inside the product, which directly affects the product's density, mechanical properties, and durability.

[0005] 2. Cumbersome subsequent processes: Open-cast products have gates that must be removed manually or mechanically after curing. This not only increases post-processing steps and affects production efficiency, but also leaves processing marks at the gate, affecting the product's appearance.

[0006] Therefore, there is an urgent need to design a better ball head pin casting mold. Summary of the Invention

[0007] In view of the above-mentioned problems in the prior art, the aim is to provide a ball head pin casting mold and a ball head pin casting method.

[0008] The specific technical solution is as follows:

[0009] A ball head pin casting mold mainly includes: a first cavity positioning plate, a second cavity positioning plate, a first half cavity, a second half cavity, a third half cavity, a fourth half cavity, a magnet, a first stop pin, and a second stop pin;

[0010] The first half-cavity and the second half-cavity are installed in the first cavity positioning plate, and the third half-cavity and the fourth half-cavity are installed in the second cavity positioning plate. The first cavity positioning plate, the second cavity positioning plate, the first half-cavity, the second half-cavity, the third half-cavity, and the fourth half-cavity form a casting cavity for the ball head pin.

[0011] The two ends of the first stop pin are respectively inserted into the first half cavity and the third half cavity, and the two ends of the second stop pin are respectively inserted into the second half cavity and the fourth half cavity;

[0012] The first half-cavity, the second half-cavity, the third half-cavity, and the fourth half-cavity are each provided with a plurality of the magnets.

[0013] The ball head pin casting mold described above also has the following feature: the first cavity positioning plate is provided with a first mounting groove and a second mounting groove, the first half cavity is installed in the first mounting groove, and the second half cavity is installed in the second mounting groove.

[0014] The second cavity positioning plate is provided with a third mounting groove and a fourth mounting groove, the third half cavity is installed in the third mounting groove, and the fourth half cavity is installed in the fourth mounting groove.

[0015] The ball head pin casting mold described above also has the following feature: the first cavity positioning plate has a first groove wall located between the first mounting groove and the second mounting groove, and a first semi-circular hole is provided on the first groove wall;

[0016] The second cavity positioning plate has a second groove wall located between the third mounting groove and the fourth mounting groove, and a second semi-circular hole is provided on the second groove wall;

[0017] The first semicircular hole and the second semicircular hole form a circular cavity.

[0018] The ball head pin casting mold described above also includes a core, wherein the first cavity positioning plate is provided with a first core half-hole, the second cavity positioning plate is provided with a second core half-hole, the first core half-hole and the second core half-hole form a core hole adapted to the core, and the core is inserted into the core hole.

[0019] The ball head pin casting mold described above also has the feature that the core hole points to and communicates with the round hole cavity.

[0020] The ball head pin casting mold described above also has the following features: the first mounting groove and the second mounting groove both penetrate the first cavity positioning plate; the first half cavity and the second half cavity both protrude from the first cavity positioning plate; the third mounting groove and the fourth mounting groove both penetrate the second cavity positioning plate; the third half cavity and the fourth half cavity both protrude from the second cavity positioning plate; and a first handle is provided at each end of the first half cavity.

[0021] The ball head pin casting mold described above also has the following feature: the first cavity positioning plate is provided with a gate, the gate is directed to and communicates with the circular hole cavity, and a pressure plunger is provided inside the gate.

[0022] The ball head pin casting mold described above also has the following features: a first fastener is provided at each end of the third half cavity, a second fastener is provided at each end of the fourth half cavity, a horizontal strip is provided on each of the two outer sides of the second cavity positioning plate, the horizontal strip is provided with a first waist hole and a second waist hole, the first fastener passes through the first waist hole of the horizontal strip, and the second fastener passes through the second waist hole of the horizontal strip.

[0023] A method for casting ball-end pins, using the aforementioned ball-end pin casting mold, is characterized by comprising the following steps:

[0024] Step 1: Place the third half-cavity and the fourth half-cavity into the second cavity positioning plate;

[0025] Step 2: The two half-bearings are fitted onto the ball head pin body, the two springs are fitted into the grooves at both ends of the two half-bearings, and the two end caps are respectively fitted onto both ends of the ball head pin body with the half-bearings and springs. The resulting structure is called a ball head pin semi-finished product. The ball head pin semi-finished product is placed into the third half-cavity and the fourth half-cavity. Each end cap is pushed to abut against one end of the corresponding half-bearing. The third half-cavity and the fourth half-cavity are pushed inwards. The semi-circular end cap positioning boss in the third half-cavity and the semi-circular end cap positioning boss in the fourth half-cavity respectively engage the two end caps. The magnet in the third half-cavity and the magnet in the fourth half-cavity respectively attract and position the two end caps.

[0026] Step 3: Place the first half-cavity on the third half-cavity and the second half-cavity on the fourth half-cavity. The first half-cavity and the second half-cavity respectively cooperate with the two end caps. Push the first half-cavity and the second half-cavity inward and tighten them. The semi-circular end cap positioning boss in the first half-cavity and the semi-circular end cap positioning boss in the second half-cavity respectively engage with the two end caps. The magnet in the first half-cavity and the magnet in the second half-cavity respectively attract and position the two end caps.

[0027] Step 4: Place the first cavity positioning plate on the first half cavity and the second half cavity;

[0028] Step 5: Pour polyurethane raw material;

[0029] Step 6: Place the mold on the vulcanizing machine and heat and pressurize it;

[0030] Step 7: Open the first cavity positioning plate. The first half cavity and the second half cavity move outward a certain distance. The semi-circular end cap positioning boss in the first half cavity and the semi-circular end cap positioning boss in the second half cavity are respectively removed from the two end caps. Then remove the first half cavity and the second half cavity. Hold the third half cavity and the fourth half cavity and separate them from the second cavity positioning plate. Remove the ball head pin.

[0031] The above-mentioned ball head pin casting method also has the following feature: between step 5 and step 6, there is a step 5.6, in which the pressure plunger is pressed into the gate of the first cavity positioning plate.

[0032] The positive effects of the above technical solution are:

[0033] The present invention provides a ball head pin casting mold and a ball head pin casting method, which adopts a brand-new design to realize the polyurethane casting molding of ball head pins with multiple components. It adopts a closed casting method and solves the technical problems 1 and 2 in the prior art. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the structure of the ball head pin to be formed in this invention;

[0035] Figure 2 for Figure 1 A schematic diagram of the exploded structure;

[0036] Figure 3 An exploded structural diagram of a ball head pin casting mold provided by the present invention;

[0037] Figure 4 A schematic diagram of the overall structure of a ball head pin casting mold provided by the present invention;

[0038] Figure 5 A schematic cross-sectional view of a ball-head pin casting mold along a first direction provided by the present invention;

[0039] Figure 6 A schematic cross-sectional view of a ball-head pin casting mold along a second direction provided by the present invention;

[0040] Figure 7 for Figure 3 A schematic diagram of the fourth half-cavity.

[0041] In the attached diagram: 1. First cavity positioning plate; 101. First mounting groove; 102. Second mounting groove; 111. First groove wall; 121. First semi-circular hole; 131. First core half-hole; 141. Second mounting groove; 2. Second cavity positioning plate; 203. Third mounting groove; 204. Fourth mounting groove; 212. Second groove wall; 222. Second semi-circular hole; 232. Second core half-hole; 3. First half-cavity; 4. Second half-cavity; 5. Third half-cavity; 6. Fourth half-cavity; 7. Magnet; 8. First stop pin; 9. Second stop pin; 11. 12. First handle; 13. Second handle; 14. Core; 15. First fastener; 16. Horizontal bar; 17. First waist hole; 18. Second waist hole; 19. Pressure plunger; 20. Template; 21. Opening; 22. Second fastener; 33. Guide sleeve; 44. Guide post; 55. Third fastener; a. Ball head pin body; a1. Ball; a2. Sheet structure; a3. Perforation; b. End cap; c. Half bearing; c1. Oil hole; c2. Groove; d. Polyurethane; d1. Hole structure; e. Spring; f. Semi-circular ring end cap positioning boss. Detailed Implementation

[0042] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0043] The serial numbers assigned to components in this document, such as "first," "second," etc., are merely used to distinguish the described objects and have no sequential or technical meaning. The terms "connection" and "linkage" used in this application, unless otherwise specified, include both direct and indirect connections (linkages). In the description of this invention, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention.

[0044] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0045] Please see Figure 1 and Figure 2 The ball head pin includes a ball head pin body a, end caps b, half bearings c, polyurethane d, and two springs e. Two half bearings c are provided, and the two half bearings c are fitted around the outer circumference of the ball head pin body a. The two springs e are respectively fitted into grooves c2 at the ends of the two half bearings c to hold them together as a single unit. The polyurethane d has a ring-shaped structure and is fitted around the outer circumference of the two half bearings c. Two end caps b are fitted at both ends of the outer circumference of the polyurethane d. The ball head pin body a can rotate. This invention requires casting the polyurethane d to form a complete ball head pin. One of the half bearings c has an oil hole c1.

[0046] The ball head pin body a includes an integrally formed central ball a1 and sheet-like structures a2 at both ends of the ball a1, each sheet-like structure a2 having a perforation a3. Except for the polyurethane d, which is made of polyurethane, the ball head pin body a, the two end caps b, the two springs e, and the two half-bearings c are all made of other materials. The polyurethane d has a perforated structure d1.

[0047] Please see Figures 3 to 7 Because the first half-cavity 3, the second half-cavity 4, the third half-cavity 5, and the fourth half-cavity 6 have similar structures, therefore Figure 7 Only the fourth half-cavity 6 is shown in the illustration. This invention discloses a ball head pin casting mold, which includes: a first cavity positioning plate 1, a second cavity positioning plate 2, a first half-cavity 3, a second half-cavity 4, a third half-cavity 5, a fourth half-cavity 6, a magnet 7, a first stop pin 8, and a second stop pin 9;

[0048] The first half-cavity 3 and the second half-cavity 4 are installed in the first cavity positioning plate 1, and the third half-cavity 5 and the fourth half-cavity 6 are installed in the second cavity positioning plate 2. The first cavity positioning plate 1, the second cavity positioning plate 2, the first half-cavity 3, the second half-cavity 4, the third half-cavity 5 and the fourth half-cavity 6 form the casting cavity of the ball head pin.

[0049] Specifically, the first cavity positioning plate 1 and the second cavity positioning plate 2 are plate-shaped parts.

[0050] The first cavity positioning plate 1 is provided with a first mounting groove 101 and a second mounting groove 102. The first half cavity 3 is installed in the first mounting groove 101 and the second half cavity 4 is installed in the second mounting groove 102.

[0051] The second cavity positioning plate 2 is provided with a third mounting groove 203 and a fourth mounting groove 204. The third half cavity 5 is installed in the third mounting groove 203, and the fourth half cavity 6 is installed in the fourth mounting groove 204.

[0052] Preferably, in this embodiment, the first mounting groove 101, the second mounting groove 102, the third mounting groove 203 and the fourth mounting groove 204 are all designed as rectangular groove structures.

[0053] Preferably, in this embodiment, the first mounting groove 101 and the second mounting groove 102 both penetrate the first cavity positioning plate 1, the first half cavity 3 and the second half cavity 4 are both exposed outside the first cavity positioning plate 1, the third mounting groove 203 and the fourth mounting groove 204 both penetrate the second cavity positioning plate 2, and the third half cavity 5 and the fourth half cavity 6 are both exposed outside the second cavity positioning plate 2.

[0054] Preferably, in this embodiment, a first handle 11 is provided at each end of the first half-cavity 3, and a second handle 12 is provided at each end of the second half-cavity 4. The first handle 11 and the second handle 12 are provided for gripping and removing the first half-cavity 3 and the second half-cavity 4.

[0055] A first mounting groove 101 and a second mounting groove 102 can be excavated on the first cavity positioning plate 1 of the plate shape. Therefore, the first cavity positioning plate 1 has a first groove wall 111 located between the first mounting groove 101 and the second mounting groove 102. A first semi-circular hole 121 is provided on the first groove wall 111.

[0056] A third mounting groove 203 and a fourth mounting groove 204 can be excavated on the second cavity positioning plate 2 of the plate shape. The second cavity positioning plate 2 has a second groove wall 212 located between the third mounting groove 203 and the fourth mounting groove 204. A second semi-circular hole 222 is provided on the second groove wall 212.

[0057] The first semicircular hole 121 and the second semicircular hole 222 form a circular cavity for molding the outer circular contour of polyurethane d.

[0058] Furthermore, in order to form the hole structure d1 on the polyurethane d, the ball head pin casting mold of the present invention also includes a core 13. The first cavity positioning plate 1 is provided with a first core half hole 131, and the second cavity positioning plate 2 is provided with a second core half hole 232. The first core half hole 131 and the second core half hole 232 form a core hole that is adapted to the core 13, and the core 13 is inserted into the core hole.

[0059] The core hole points to and connects with the circular cavity. The core 13 is used to realize the hole structure d1 of the polyurethane d. The specific position and number of cores 13 are designed according to the hole structure d1 on the polyurethane d to be formed.

[0060] Preferably, in this embodiment, a first fastener 14 is provided at each end of the third half-cavity 5, and a second fastener 18 is provided at each end of the fourth half-cavity 6. A horizontal strip 15 is provided on each of the two outer sides of the second cavity positioning plate 2. The horizontal strip 15 is provided with a first waist hole 1501 and a second waist hole 1502. The first fastener 14 passes through the first waist hole 1501 of the horizontal strip 15, and the second fastener 18 passes through the second waist hole 1502 of the horizontal strip 15. The purpose of this design is that when demolding, the horizontal strips 15 on both sides are lifted, and the third half-cavity 5 and the fourth half-cavity 6 are lifted upward and separated to both sides, so that the molded product (ball head pin) can be removed from the product. Optionally, the first handle 11, the second handle 12, the first fastener 14 and the second fastener 18 can be screws or bolts, etc. In other embodiments, the first handle 11, the second handle 12, the first fastener 14 and the second fastener 18 can be rods.

[0061] To form the perforation a3 on the sheet-like structure a2 of the ball head pin body a, the ball head pin casting mold of the present invention is further provided with a first stop pin 8 and a second stop pin 9. The two ends of the first stop pin 8 are respectively inserted into the first half cavity 3 and the third half cavity 5, and the two ends of the second stop pin 9 are respectively inserted into the second half cavity 4 and the fourth half cavity 6.

[0062] Preferably, in this embodiment, the first half-cavity 3, the second half-cavity 4, the third half-cavity 5, and the fourth half-cavity 6 are each provided with a plurality of magnets 7. The magnets 7 are used to attract the end cap b, preventing it from shaking during casting. Optionally, the first half-cavity 3, the second half-cavity 4, the third half-cavity 5, and the fourth half-cavity 6 are each provided with a semi-circular end cap positioning boss f for positioning the end cap b. The magnets 7 are disposed on the bottom surface of the groove of the semi-circular end cap positioning boss f. The bottom surface of the groove of the semi-circular end cap positioning boss f has mounting holes for installing the magnets 7. Optionally, each semi-circular end cap positioning boss f is provided with three magnets 7 or other numbers of magnets 7.

[0063] Furthermore, the first cavity positioning plate 1 is provided with a gate 141, which points to and communicates with the circular cavity. A pressure plunger 16 is provided inside the gate 141. The pressure plunger 16 can compress the liquid raw material in the cavity, making the raw material more compact. After compression, there will be a little overflow at all parting surfaces to ensure that air is discharged.

[0064] Furthermore, it also includes a template 17, which is disposed on the side of the first cavity positioning plate 1 facing away from the second cavity positioning plate 2. The template 17 is provided with an opening 1701 aligned with the gate 141. The opening 1701 is used to install a third fastener 23 such as screws or bolts to connect the template 17 to the pressure plunger 16.

[0065] Optionally, a plurality of first guide components are provided between the template 17 and the first cavity positioning plate 1, and a plurality of second guide components are provided between the first cavity positioning plate 1 and the second cavity positioning plate 2. Both the first guide components and the second guide components include guide sleeves 19 and guide posts 21. Guide sleeves 19 and guide posts 21 are existing technologies and will not be described in detail here.

[0066] The present invention provides a ball head pin casting mold, which adopts a brand-new design to realize the polyurethane casting of ball head pins with multiple components. It adopts a closed casting method and solves the technical problems 1 and 2 in the prior art.

[0067] This invention also discloses a method for casting ball-end pins, using the aforementioned ball-end pin casting mold, comprising the following steps:

[0068] Step 1: Place the third half-cavity 5 and the fourth half-cavity 6 into the second cavity positioning plate 2;

[0069] Step 2: Two half-bearings c are fitted onto the ball head pin body a1. Two springs e are fitted into the grooves at both ends of the two half-bearings c. Two end caps b are fitted onto both ends of the ball head pin body a1 with the half-bearings c and springs e. The resulting structure is called a ball head pin semi-finished product. The ball head pin semi-finished product is placed into the third half-cavity 5 and the fourth half-cavity 6. Each end cap b is pushed to abut against one end of the corresponding half-bearing c. The third half-cavity 5 and the fourth half-cavity 6 are pushed inwards. The semi-circular end cap positioning boss f in the third half-cavity 5 and the semi-circular end cap positioning boss f in the fourth half-cavity 6 respectively engage the two end caps b. The magnet 7 in the third half-cavity 5 and the magnet 7 in the fourth half-cavity 6 respectively attract and position the two end caps b.

[0070] Step 3: Place the first half-cavity 3 on the third half-cavity 5, and place the second half-cavity 4 on the fourth half-cavity 6. The first half-cavity 3 and the second half-cavity 4 respectively cooperate with the end caps b. Push the first half-cavity 3 and the second half-cavity 4 inward and tighten them. The semi-circular end cap positioning boss f in the first half-cavity 3 and the semi-circular end cap positioning boss f in the second half-cavity 4 respectively engage with the end caps b. The magnet 7 in the first half-cavity 3 and the magnet 7 in the second half-cavity 4 respectively attract and position the end caps b.

[0071] Step 4: Place the first cavity positioning plate 1 on the first half cavity 3 and the second half cavity 4;

[0072] Step 5: Pour polyurethane raw material;

[0073] Step 6: Place the ball head pin casting mold on the vulcanizing machine and heat and pressurize it;

[0074] Step 7: Open the first cavity positioning plate 1. The first half-cavity 3 and the second half-cavity 4 move outward a certain distance. The semi-circular end cap positioning boss f in the first half-cavity 3 and the semi-circular end cap positioning boss f in the second half-cavity 4 respectively exit from the first cavity positioning plate 1 through the two end caps b. Then remove the first half-cavity 3 and the second half-cavity 4. Hold the third half-cavity 5 and the fourth half-cavity 6 and separate them from the second cavity positioning plate 2. Remove the obtained ball head pin. Optionally, in the aforementioned embodiment with template 17, step 7 includes opening template 17 before opening the first cavity positioning plate 1.

[0075] Specifically, step 5 involves pouring a certain amount of polyurethane raw material into the gate 141; the certain amount of polyurethane raw material refers to the calculated amount, which is calculated according to the molding requirements.

[0076] Furthermore, step 5.6 is included between step 5 and step 6, in which the template 17 is placed on the first cavity positioning plate 1, and the pressure plunger 16 is pressed into the gate 141 of the first cavity positioning plate 1 to form polyurethane d.

[0077] The present invention provides a method for casting ball head pins, which adopts a novel process to achieve polyurethane casting of ball head pins with multiple components. It uses a closed casting method and solves the technical problems 1 and 2 in the prior art.

[0078] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0079] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. A ball-head pin casting mold, characterized in that, include: First cavity positioning plate, second cavity positioning plate, first half cavity, second half cavity, third half cavity, fourth half cavity, magnet, first stop pin and second stop pin; The first half-cavity and the second half-cavity are installed in the first cavity positioning plate, and the third half-cavity and the fourth half-cavity are installed in the second cavity positioning plate. The first cavity positioning plate, the second cavity positioning plate, the first half-cavity, the second half-cavity, the third half-cavity, and the fourth half-cavity form a casting cavity for the ball head pin. The two ends of the first stop pin are respectively inserted into the first half cavity and the third half cavity, and the two ends of the second stop pin are respectively inserted into the second half cavity and the fourth half cavity; The first half-cavity, the second half-cavity, the third half-cavity, and the fourth half-cavity are each provided with a plurality of the magnets.

2. The ball-head pin casting mold according to claim 1, characterized in that, The first cavity positioning plate is provided with a first mounting groove and a second mounting groove, the first half cavity is installed in the first mounting groove, and the second half cavity is installed in the second mounting groove; The second cavity positioning plate is provided with a third mounting groove and a fourth mounting groove, the third half cavity is installed in the third mounting groove, and the fourth half cavity is installed in the fourth mounting groove.

3. The ball-head pin casting mold according to claim 2, characterized in that, The first cavity positioning plate has a first groove wall located between the first mounting groove and the second mounting groove, and a first semi-circular hole is provided on the first groove wall; The second cavity positioning plate has a second groove wall located between the third mounting groove and the fourth mounting groove, and a second semi-circular hole is provided on the second groove wall; The first semicircular hole and the second semicircular hole form a circular cavity.

4. The ball-head pin casting mold according to claim 3, characterized in that, It also includes a core, wherein the first cavity positioning plate is provided with a first core half-hole, and the second cavity positioning plate is provided with a second core half-hole, the first core half-hole and the second core half-hole forming a core hole adapted to the core, and the core is inserted into the core hole.

5. The ball-head pin casting mold according to claim 4, characterized in that, The core hole points to and communicates with the circular cavity.

6. The ball-head pin casting mold according to claim 4, characterized in that, The first mounting groove and the second mounting groove both penetrate the first cavity positioning plate, the first half cavity and the second half cavity both protrude from the first cavity positioning plate, the third mounting groove and the fourth mounting groove both penetrate the second cavity positioning plate, the third half cavity and the fourth half cavity both protrude from the second cavity positioning plate, and a first handle is provided at each end of the first half cavity.

7. The ball-head pin casting mold according to claim 6, characterized in that, The first cavity positioning plate is provided with a gate, which is directed to and connected to the circular cavity, and a pressure plunger is provided inside the gate.

8. The ball head pin casting mold according to claim 7, characterized in that, Each end of the third half cavity is provided with a first fastener, and each end of the fourth half cavity is provided with a second fastener. Each outer side of the second cavity positioning plate is provided with a horizontal strip plate, and the horizontal strip plate is provided with a first waist hole and a second waist hole. The first fastener passes through the first waist hole of the horizontal strip plate, and the second fastener passes through the second waist hole of the horizontal strip plate.

9. A method for casting ball-end pins, using the ball-end pin casting mold according to any one of claims 1 to 9, characterized in that, Includes the following steps: Step 1: Place the third half-cavity and the fourth half-cavity into the second cavity positioning plate; Step 2: The two half-bearings are fitted onto the ball head pin body, the two springs are fitted into the grooves at both ends of the two half-bearings, and the two end caps are respectively fitted onto both ends of the ball head pin body with the half-bearings and springs. The resulting structure is called a ball head pin semi-finished product. The ball head pin semi-finished product is placed into the third half-cavity and the fourth half-cavity. Each end cap is pushed to abut against one end of the corresponding half-bearing. The third half-cavity and the fourth half-cavity are pushed inwards. The semi-circular end cap positioning boss in the third half-cavity and the semi-circular end cap positioning boss in the fourth half-cavity respectively engage the two end caps. The magnet in the third half-cavity and the magnet in the fourth half-cavity respectively attract and position the two end caps. Step 3: Place the first half-cavity on the third half-cavity and the second half-cavity on the fourth half-cavity. The first half-cavity and the second half-cavity respectively cooperate with the two end caps. Push the first half-cavity and the second half-cavity inward and tighten them. The semi-circular end cap positioning boss in the first half-cavity and the semi-circular end cap positioning boss in the second half-cavity respectively engage with the two end caps. The magnet in the first half-cavity and the magnet in the second half-cavity respectively attract and position the two end caps. Step 4: Place the first cavity positioning plate on the first half cavity and the second half cavity; Step 5: Pour polyurethane raw material; Step 6: Place the mold on the vulcanizing machine and heat and pressurize it; Step 7: Open the first cavity positioning plate. The first half cavity and the second half cavity move outward a certain distance. The semi-circular end cap positioning boss in the first half cavity and the semi-circular end cap positioning boss in the second half cavity are respectively removed from the two end caps. Then remove the first half cavity and the second half cavity. Hold the third half cavity and the fourth half cavity and separate them from the second cavity positioning plate. Remove the ball head pin.

10. The method for casting ball-head pins according to claim 9, characterized in that, Step 5.6 is also included between step 5 and step 6, in which the pressure plunger is pressed into the gate of the first cavity positioning plate.

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