Automatic compensation high-precision guide pin, guide sleeve and mold

Abstract

The present invention discloses an automatic compensation high-precision guide column and guide sleeve, comprising a guide sleeve, the guide sleeve comprising a mounting portion and a column, the column and the mounting portion are slidably connected, the mounting portion is provided with a cavity that passes through from top to bottom, the column passes through the mounting portion from the cavity, an adjusting nut is also provided in the cavity, the adjusting nut is threadedly connected to the cavity, an elastic member is also provided between the adjusting nut and the column; and a pressure ring is also provided, the pressure ring is pressed on the upper end surface of the mounting portion. The present invention adopts a split structure for the column and the mounting portion, and then the column can slide downward relatively during the mold closing process, thereby avoiding the necessary gap to meet the production needs; at the same time, since the guide column and the guide sleeve need to be precisely matched, when the guide column is installed, the mounting portion cannot be radially squeezed, otherwise it will make it difficult to lift the column, so the mounting portion needs to be fixedly installed using a pressure ring.

Description

Technical Field

[0001] The invention relates to the field of moulds, in particular to guide pins and guide sleeves used in moulds. Background Art

[0002] Guide pins are used in combination with guide sleeves in molds to ensure that the mold is accurately positioned to guide the mold stroke. In order to improve the molding accuracy of the mold, the accuracy requirements for guide pins are getting higher and higher. In most existing molds, guide pins and guide sleeves are installed on the fixed mold and the movable mold respectively. When the movable mold and the fixed mold are closed, the centering contact surface and the parting surface of the guide pin and the guide sleeve are required to be completely coplanar.

[0003] However, in the production of some products (such as sealing rings), it is necessary to reserve some small gaps on the parting surface of the mold, that is, the two molds cannot be completely closed. In the prior art, the conical centering guide pin and the conical centering guide sleeve are relatively fixedly installed in the mounting holes of the fixed mold and the movable mold, and the contact position of the two is fixed. As the guide pin and the guide sleeve wear during the working process, the contact surface of the two changes, which reduces the problem of stamping position accuracy. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide an automatic compensation high-precision guide column and guide sleeve to solve one or more technical problems existing in the prior art and at least provide a beneficial choice or create conditions.

[0005] The solution of the present invention to its technical problem is: an automatically compensated high-precision guide column and guide sleeve, including a guide sleeve, the guide sleeve including a mounting part and a column, the column and the mounting part are slidably connected, the mounting part is provided with a cavity running through from top to bottom, the column passes through the mounting part from the cavity, an adjusting nut is also provided in the cavity, the adjusting nut is threadedly connected to the cavity, an elastic part is also provided between the adjusting nut and the column; it also includes a pressure ring, the pressure ring is pressed on the upper end surface of the mounting part.

[0006] The beneficial effects of the present invention are as follows: the present invention adopts a split structure for the column and the mounting part, and then the column can slide downward relatively during the mold closing process, thereby avoiding the necessary gap and meeting the production needs; at the same time, since the guide column and the guide sleeve need to be precisely matched, the mounting part cannot be radially squeezed when the guide column is installed, otherwise it will make it difficult to lift the column, so the mounting part needs to be fixedly installed using a pressure ring.

[0007] As a further improvement of the above technical solution, a sealing member is further provided between the cavity and the column. By adding the sealing member, colloid or dust can be effectively prevented from entering the cavity during the injection molding process.

[0008] As a further improvement of the above technical solution, the bottom plate of the column is provided with a clamping ring, the cavity is provided with a clamping groove, and the clamping ring abuts against the clamping groove. The clamping ring and the clamping groove cooperate with each other to limit the column and prevent the column from completely passing through the cavity.

[0009] As a further improvement of the above technical solution, the column includes a straight body section and a tapered section, and the tapered section is located above the straight body section. The column uses a structure of an upper cone and a lower straight line to improve the positioning accuracy and positioning reliability of the guide column and guide sleeve.

[0010] As a further improvement of the above technical solution, the taper of the conical section is 8° to 15°.

[0011] As a further improvement of the above technical solution, the upper end of the mounting portion is provided with a step surface, and the pressure ring includes a clamping surface, and the clamping surface abuts against the step surface.

[0012] As a further improvement of the above technical solution, the pressure ring is in an annular shape as a whole, and is provided with a notch, which is arc-shaped, and the arc surface of the notch matches the outer contour surface of the mounting portion. The notch on the pressure ring can fix the circumference of the mounting portion and improve the installation reliability.

[0013] As a further improvement of the above technical solution, it also includes a guide sleeve, the guide sleeve includes a sleeve body, a positioning cavity is provided in the sleeve body, and the positioning cavity corresponds to the column.

[0014] In addition, the present invention also provides a mold, including a template, and also includes the above-mentioned automatic compensation high-precision guide pins and guide sleeves, and the guide pins are installed on the template.

[0015] As a further improvement of the above technical solution, a mounting hole is provided in the template, and the mounting portion is loosely matched with the mounting hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly describes the drawings required for use in the description of the embodiments. Obviously, the drawings described are only part of the embodiments of the present invention, not all of the embodiments, and those skilled in the art can also obtain other design solutions and drawings based on these drawings without creative work.

[0017] Figure 1 It is a three-dimensional schematic diagram of the present invention;

[0018] Figure 2 is a cross-sectional view of the present invention;

[0019] Figure 3 It is an exploded view of the present invention. DETAILED DESCRIPTION

[0020] The following will clearly and completely describe the concept, specific structure and technical effects of the present invention in combination with the embodiments and drawings, so as to fully understand the purpose, characteristics and effects of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, other embodiments obtained by technicians in this field without creative work are all within the scope of protection of the present invention. The preferred embodiments of the present invention are shown in the drawings. The purpose of the drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present invention, but it cannot be understood as a limitation on the scope of protection of the present invention.

[0021] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0022] In the description of the present invention, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood as not including the number itself, and "above", "below", "within" etc. are understood as including the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0023] In the description of the present invention, unless otherwise clearly defined, the terms such as setting, installing, connecting, etc. should be understood in a broad sense, and the technical personnel in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific content of the technical solution. At the same time, the various technical features in the invention can be combined interchangeably without conflicting with each other.

[0024] Reference Figure 1 to Figure 3The present invention provides an automatic compensation high-precision guide pin and guide sleeve. It can be applied to an injection mold, and the injection mold can be used to produce sealing rings. In the existing sealing ring injection mold, there are generally multiple product cavities, so that multiple sealing rings can be formed in one injection process; at the same time, in order to facilitate the removal of the product, the existing mold requires that the mold should not be completely closed when the mold is closed, and a mold clearance of 0.03mm to 0.08mm needs to be retained between the upper mold and the lower mold as a parting surface interlayer. In this way, after the product is formed, there is a thin connecting sheet between the sealing rings, so that when the product is taken out, all the sealing rings can be connected to each other in a string, which is convenient for taking out all the products at one time, and then the connecting sheet can be peeled off from the product. In order to improve the molding quality of the product, it is necessary to ensure that the upper mold and the lower mold are accurately positioned when the mold is closed, so it is necessary to use a guide pin and guide sleeve to position the mold, but in the traditional guide pin and guide sleeve, the relative position of the guide pin is immutable, so that the mold cannot meet the production needs when the mold is closed.

[0025] To this end, the present invention provides an automatic compensation high-precision guide pin and guide sleeve. It includes a guide pin 100 and a guide sleeve (not shown in the figure). The guide pin and guide sleeve are matching products, wherein the guide pin 100 includes a cylindrical mounting portion 110 and a cylindrical column 120. The mounting portion 110 is provided with a cavity 111 that passes through from top to bottom. The cavity 111 includes an upper cavity 112 and a lower cavity 113. The inner diameter of the upper cavity 112 is smaller than the inner diameter of the lower cavity. Both the upper cavity 112 and the lower cavity 113 are circular cavities, and the center lines of the upper cavity 112 and the lower cavity 113 overlap. A card slot 114 is formed between the upper cavity 112 and the lower cavity 113; in addition, a sealing groove 115 is provided in the middle position of the upper cavity 112, and the cross section of the sealing groove 115 is rectangular; and an internal thread 116 is provided at the lower end of the lower cavity 113.

[0026] The column 120 includes a tapered section 121, a straight section 122 and a snap ring 123 from top to bottom. The tapered section 121 is small at the top and large at the bottom. The outer diameter of the straight section 122 is equivalent to the outer diameter of the lowest end of the tapered section 121, and the outer diameter of the snap ring 123 is larger than the outer diameter of the straight section 122. In addition, the outer diameter of the straight section 122 is slightly smaller than the inner diameter of the upper cavity 112, and the difference between the two is about 0.002mm to 0.003mm; and the outer diameter of the snap ring 123 is larger than the inner diameter of the upper cavity 112 and smaller than the inner diameter of the lower cavity 113. The column 120 is formed by lathe cutting of a solid steel rod. Since it can be formed by clamping once, the tapered section 121 and the straight section 122 have good coaxiality.

[0027] When in use, the conical section 121 is used to ensure the coaxiality of the guide pin and the guide sleeve, so that the mold closing of the fixed mold and the movable mold is more accurate; then the straight section is used to ensure a good fit between the guide pin and the guide sleeve, avoiding shaking of the guide pin and the guide sleeve during operation.

[0028] In addition, the guide sleeve 100 of the present embodiment further comprises an adjusting nut 130 and two spring sheets 140, wherein the adjusting nut 130 comprises an external thread, and the middle of the adjusting nut 130 further comprises a screwdriver slot, and the external thread of the adjusting nut 130 is threadedly connected with the internal thread 116 of the mounting portion 110. The two spring sheets 140 are stacked together and then placed between the adjusting nut 130 and the column 120.

[0029] Of course, in some other embodiments, there may be only one spring sheet, or no spring sheet is used, but other elastic members such as compression springs are used.

[0030] During installation, firstly, the column 120 is passed through the cavity 111 from bottom to top, so that the tapered section 121 and the straight section 122 pass through the upper cavity 112. Since the outer diameter of the snap ring 123 is larger than the inner diameter of the upper cavity 112, the snap ring 123 can relatively abut against the slot 114. Then, the spring sheet 140 is placed in the cavity 111, and finally, the adjusting nut 130 is screwed on, so that the adjusting nut 130 can abut against the spring sheet 140 and force the spring sheet 140 to abut against the bottom surface of the snap ring 123 at the same time. In order to ensure that the column 120 will not retract into the cavity 111 in a free state, a certain pre-tightening force can be applied to the adjusting nut 130.

[0031] The innovation of this embodiment is mainly reflected in the guide post 100, while the guide sleeve can adopt the common guide sleeve structure in the prior art. For example, the guide sleeve includes a sleeve body, and a positioning cavity is provided in the sleeve body, and the positioning cavity corresponds to the column 120. When in use, ensure that the guide sleeve and the guide post 100 are installed in a center, and then the guide post and the guide sleeve are installed in the fixed mold and the movable mold of the mold respectively. When the mold is closed, the column 120 first contacts the positioning cavity, and then guides the movable mold and the fixed mold to close the mold accurately. After the mold is closed, by reasonably setting the installation depth of the guide post and the guide sleeve, when the guide post and the guide sleeve are close, the guide sleeve can press the column 120 slightly downward, so that the column 120 can overcome the elastic force of the spring sheet 140 and partially retract into the cavity 111. The moving distance of the column 120 is approximately equal to the mold clearance required for production mentioned above.

[0032] Since the guide pin and guide sleeve are connected to the cavity in the mold, during the injection molding process, the material may flow into the interior of the cavity from the gap between the column 120 and the cavity 111, thereby causing the movement of the column 120 to be stuck. Therefore, in this solution, an O-ring 150 is provided in the sealing groove 115 of the upper cavity 112, and the sealing groove 115 is relatively close to the upper part of the upper cavity 112. Of course, when installing, it is necessary to first put the O-ring 150 in the sealing groove 115, and then pass the column 120 through the cavity 111, so that the O-ring 150 can tightly wrap the outer wall of the straight section 122 of the column 120, effectively preventing the material from flowing from the periphery of the column 120 into the lower cavity 113.

[0033] In some other embodiments, an O-ring may not be used, for example, a Y-ring may be used for sealing.

[0034] In order to avoid the inflow of materials as much as possible and to ensure the mold fitting accuracy of the guide pin and guide sleeve, the gap between the column 120 and the cavity is very small, but the gap cannot be too small. A too small gap will easily cause a jam between the column 120 and the cavity 111. In serious cases, it will damage the guide pin and guide sleeve, and even damage the mold. Therefore, how to ensure the gap between the column 120 and the cavity 111 is particularly important. When the traditional guide pin is installed on the mold template, it is fixed and installed by interference fit, that is, the mounting hole on the template will be smaller than the outer diameter of the mounting part of the guide pin. After the installation is completed, the mounting hole of the template will generate a radial clamping force on the mounting part of the guide pin, and the clamping force will cause local deformation of the cavity 111. When the cavity 111 is deformed, it may cause the gap between the column 120 and the upper cavity 112 to deform, so that the column 120 will jam when moving up and down.

[0035] To this end, in this solution, the traditional guide column and guide sleeve installation structure is abandoned, and the installation hole between the installation portion 110 of the guide column 100 and the template adopts a clearance fit method, that is, the installation portion 110 can enter and exit the installation hole relatively freely, and the installation between the guide column 100 and the template is fixed, and the following installation method is adopted:

[0036] It also includes a pressure ring 200, of which there are two. The two pressure rings are located on the left and right sides of the mounting portion 110, and the pressure ring 200 is pressed against the upper end surface of the mounting portion 110. In order to prevent the upper end surface of the pressure ring 200 from being higher than the parting surface of the template, the mounting portion 110 is processed with a circle of stepped surface 117 on its top surface, and a notch 210 is provided on the side of the pressure ring 200 facing the mounting portion 110. The notch 210 is arc-shaped, and the curvature of the arc surface matches the shape of the mounting portion 110. At the same time, a clamping surface 220 protruding from the notch 210 is provided above the notch 210, and the clamping surface 220 is against the top of the stepped surface 117. See Figure 2 It is known that a step is formed between the pressing surface 220 and the notch 210, and the step is just pressed on the stepped surface of the mounting portion 110, so that the upper end surface of the pressing ring 200 can be substantially flush with the upper end surface of the mounting portion 110. In addition, the arcuate surfaces of the two notches 210 can play a role in positioning the mounting portion 110 in the radial direction, preventing the guide column 100 from radially deviating and maintaining the installation accuracy of the guide column.

[0037] Since the installation and fixation of the guide column completely depends on the compression of the two pressing rings 200, it is necessary to ensure that the pressing rings 200 and the template can be stably installed. Figure 1 to Figure 3 In this solution, the fixing of the compression ring is achieved by using a special screw. The screw 300 used in this solution is a countersunk screw, which includes a head 310 and a screw section 320. A transition section 330 is provided between the head 310 and the screw section 320. The outer diameter of the transition section 330 is smaller than the outer diameter of the screw section 320. The head 310 is in a cone shape with a larger top and a smaller bottom, and the taper is 15° to 20°. Preferably, the taper of the head 310 in this solution is 18°. A screwdriver slot is provided in the middle of the head 310. The screw 300 of this solution is similar to the commonly used countersunk screws in the prior art, but the existing countersunk screws generally do not have a reduced transition section 330, and the taper of the head 310 is basically 45°. However, for the pressing ring 200, the most important thing is to provide axial locking force, while the radial locking force cannot be too large. Therefore, the screws of this solution are optimized to use screws with a taper of 18°, which cooperate with the countersunk holes in the pressing ring 200, so that the guide column 100 can be firmly and reliably fixed on the template.

[0038] Since the guide sleeve is a component of a single structure, the guide sleeve and the mold template can be installed by the pressure ring fixing method of this solution, or by the traditional interference fit fixing method.

[0039] As a further preferred embodiment, in order to ensure the guiding accuracy and installation reliability of the guide column and the guide sleeve, the taper of the tapered section 121 of the column 120 is 8° to 15°. Specifically, in this embodiment, the taper is 10°.

[0040] The preferred embodiments of the present invention are specifically described above, but the invention is not limited to the embodiments. Those skilled in the art may make various equivalent modifications or substitutions without violating the spirit of the invention. These equivalent modifications or substitutions are all included in the scope defined by the claims of this application.

Claims

1. An automatic compensation high-precision guide pin and guide sleeve, characterized in that: It includes a guide column, which includes a mounting portion and a column, which is slidably connected to the mounting portion, the mounting portion is provided with a cavity that passes through from top to bottom, the column passes through the mounting portion from the cavity, an adjusting nut is also provided in the cavity, the adjusting nut is threadedly connected to the cavity, and an elastic member is also provided between the adjusting nut and the column; it also includes a pressure ring, which is pressed on the upper end surface of the mounting portion; a step surface is provided at the upper end of the mounting portion, the pressure ring includes a clamping surface, and the clamping surface abuts against the step surface; the pressure ring is in a circular ring shape as a whole, and a notch is provided on the pressure ring, the notch is arc-shaped, and the arc surface of the notch is adapted to the outer contour surface of the mounting portion; it also includes a countersunk screw, which is used for the installation of the pressure ring, the countersunk screw includes a head and a screw section, the head is in a cone shape that is larger at the top and smaller at the bottom, and the taper of the cone is 15°~20°.

2. The automatic compensation high-precision guide pin and guide sleeve according to claim 1 is characterized in that: A sealing member is also provided between the cavity and the column.

3. The automatic compensation high-precision guide pin and guide sleeve according to claim 1 is characterized in that: The bottom plate of the column is provided with a clamping ring, and a clamping groove is provided in the cavity, and the clamping ring abuts against the clamping groove.

4. The automatic compensation high-precision guide pin and guide sleeve according to claim 1, characterized in that: The column comprises a straight section and a tapered section, wherein the tapered section is located above the straight section.

5. The automatic compensation high-precision guide pin and guide sleeve according to claim 4, characterized in that: The taper of the tapered section is 8° to 15°.

6. The automatic compensation high-precision guide pin and guide sleeve according to claim 1, characterized in that: It also includes a guide sleeve, which includes a sleeve body. A positioning cavity is provided in the sleeve body, and the positioning cavity corresponds to the column.

7. A mold, characterized in that: It comprises a template and also comprises an automatic compensation high-precision guide pin and guide sleeve as described in any one of claims 1 to 6 above, wherein the guide pin is installed on the template.

8. The mold according to claim 7, characterized in that: The template is provided with a mounting hole, and the mounting portion is loosely matched with the mounting hole.

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