Hexagonal head flange non-disengaging screw cold heading forming die and screw rod part upsetting die

Abstract

The utility model relates to the technical field of machining, in particular to a cold heading forming die for a hexagon head flange non-disengaging screw and a screw rod upsetting die, and the cold heading forming die for the hexagon head flange non-disengaging screw comprises four groups of male dies and four groups of female dies and is installed on a multi-station bolt forming machine. A material blank is moved between four groups of male dies and female dies through a material clamping system of the forming machine, and the material blank is sequentially subjected to head pre-forming, cylinder and flange forming of the head, hexagon and rod part shrinking and die assembly to form a thick rod. According to the utility model, the product is processed in one processing procedure, the production efficiency of the product is improved, and one procedure is reduced, so that the defective product and the labor cost of an enterprise are saved.

Description

Technical Field

[0001] The utility model relates to the technical field of machining, in particular to a cold forging die for a hexagonal head flange screw that does not fall out and a screw rod upsetting die. Background Art

[0002] Hexagonal head flange non-slip screws consist of two parts: a hexagonal head non-slip screw and a flange surface. Ordinary hexagonal head non-slip screws have threads in the front and a thin screw in the middle. The thin screw is cleverly used to prevent the screw from falling off, that is, by adding a small-diameter screw, the screw is hung on the connecting part (or through a sleeve or a retaining ring) by the small-diameter screw to prevent the screw from falling off. The screw structure itself does not have the function of preventing it from falling off. The anti-falling function of the screw is achieved by the connection method between the connected part, that is, the small-diameter screw of the screw is clamped on the mounting hole of the connected part through a certain structure to prevent it from falling off. The existence of the flange surface makes its "support area to stress area ratio" greater than that of ordinary hexagonal head screws, so this type of bolt can withstand higher preload, and is therefore widely used in automotive engines, heavy machinery and other products.

[0003] There are two existing processing technologies for hexagonal head flange screws that do not fall out: one is cold heading, turning, thread rolling, heat treatment, surface treatment, and packaging; the other is cold heading, die closing (upsetting the end of the rod), thread rolling, heat treatment, surface treatment, and packaging. After the former is cold heading, the rod diameter meets the outer diameter of the threaded rod, so it is necessary to turn a small-diameter screw on the rod of the product; after the latter is cold heading, the rod diameter is equal to the outer diameter of the small-diameter screw, and a new set of molds needs to be redesigned to close the rod of the product to produce a rough rod (to meet the outer diameter of the threaded rod). Both require additional processing steps, which have the problem of bad waste. At the same time, they are divided into two processing steps, resulting in low product consistency, poor quality stability, and low production efficiency, which also increases the manpower and management costs of the enterprise.

[0004] Based on this, the present application provides a cold heading forming die for hexagonal flange screws that will not fall out, and the product after cold heading can be directly subjected to thread rolling processing and subsequent treatment. Utility Model Content

[0005] The utility model aims to solve the technical problems existing in the prior art. To this end, the utility model provides a cold heading forming die for hexagonal head flange without screw falling out, and the product after cold heading can be directly subjected to thread rolling processing and subsequent treatment.

[0006] The technical solution adopted by the utility model to solve its technical problems is:

[0007] In the first aspect, a screw rod upsetting die is provided, comprising a male die and a female die fixedly mounted on a multi-station forming machine, the end of the male die is provided with a necking head that can enter the female die, and the necking head is provided with a male die core for constraining the head of the blank; the female die comprises a female die sleeve, a female die slider seat and a female die core assembly that are movably arranged in the female die sleeve in sequence, a spring and a spring seat fixedly arranged at the rear end of the female die sleeve, a three-piece die core movably arranged in the female die slider seat, and a female die push rod, the female die slider seat is provided with an inverted cone through hole, the three-piece die core is a truncated cone composed of three cores, and a cavity for constraining the rod of the blank is provided therein, the female die core is provided with an upsetting cavity for upsetting the rod of the blank, the spring is arranged between the female die core and the spring seat, one end of the female die push rod passes through the spring seat and extends into the upsetting cavity of the female die core, for shaping the tail of the blank and pushing the blank out.

[0008] Preferably, the female mold core assembly comprises a female mold core and an inner pad, the female mold core is embedded in the inner pad, and the inner pad is movably arranged in the female mold sleeve.

[0009] Preferably, the female mold further comprises a movable pad, wherein the movable pad is arranged behind the inner pad, and the spring is arranged between the movable pad and the spring seat.

[0010] Preferably, in the three-piece mold core, both end faces of each mold core are provided with blind holes, and after two adjacent mold cores are assembled, they are limited by limit pins in the blind holes.

[0011] Preferably, the female mold further includes a female mold slider seat cover plate, which is fixedly mounted on the female mold slider seat and is used to limit the three-piece mold core.

[0012] In a second aspect, a cold heading forming die for a hexagonal head flange without screws coming out is provided, comprising:

[0013] Four groups of positive molds, including a one-sequence positive mold, a two-sequence positive mold, a three-sequence positive mold and a four-sequence positive mold;

[0014] Four groups of female molds, including a first-order female mold, a second-order female mold, a third-order female mold and a fourth-order female mold corresponding to the first-order male mold, the second-order male mold, the third-order male mold and the fourth-order male mold, respectively, wherein the fourth-order male mold and the fourth-order female mold respectively adopt the male mold and the female mold structure in the screw rod upsetting mold;

[0015] The four groups of male and female dies are respectively installed on the multi-station bolt forming machine. The blank is moved between the four groups of male and female dies through the clamping system of the forming machine, and the blank is sequentially preformed into a head, a head forming cylinder and a flange, a hexagonal and a rod part, and a rough rod is produced by closing the mold.

[0016] In a preferred embodiment, the first-order positive mold comprises:

[0017] A first-order male die punch sleeve, fixed to the molding machine;

[0018] A first-order male die core is arranged at the front end of the first-order male die punch sleeve;

[0019] A first-order punching die ejector rod is connected from the tail end of the first-order male die punching sleeve to the first-order male die punching sleeve and the first-order male die core;

[0020] The first-order male die pad is arranged at the rear end of the first-order male die punch sleeve and is used to tighten the first-order die ejector pin;

[0021] The first-order negative mold comprises:

[0022] A first-order female die sleeve is fixedly installed on the molding machine relative to the first-order male die sleeve;

[0023] A first-order female mold core is embedded in the end of the first-order female mold sleeve relative to the first-order male mold core, and a cavity for upsetting the head of the blank and binding the rod is provided in the first-order female mold core;

[0024] A first-order female mold push rod, which passes through the first-order female mold sleeve and extends into the mold cavity of the first-order female mold core from one end of the first-order female mold sleeve away from the first-order female mold core, and the other end is fixedly connected to the first-order female mold push rod sleeve for pushing out the blank and shaping the tail of the blank.

[0025] In a preferred embodiment, the second-order positive mold includes:

[0026] A second-order male die punch sleeve is fixed to the molding machine;

[0027] A second-order male mold core is arranged at the front end of the second-order male mold punch sleeve, and the end surface of the second-order male mold core is provided with a cavity for preforming the head of the blank;

[0028] The second-order punch ejector pin passes through the second-order punch sleeve from the tail end of the second-order male die punch sleeve and extends into the cavity of the second-order male die core;

[0029] The second-order male die pad is arranged at the rear end of the second-order male die punch sleeve and is used to limit the second-order die ejector rod;

[0030] The two-order negative mold comprises:

[0031] A second-order female die sleeve, fixedly installed on the molding machine relative to the second-order male die sleeve;

[0032] A second-order female mold core is embedded in the end of the second-order female mold sleeve relative to the second-order male mold core, and a cavity for preforming the flange surface of the blank and binding the rod portion is provided in the second-order female mold core;

[0033] The second-order female mold push rod passes through the second-order female mold sleeve and extends into the mold cavity of the second-order female mold core at one end of the second-order female mold sleeve away from the second-order female mold core. The other end is fixedly connected to the second-order female mold push rod sleeve for pushing out the blank and shaping the tail of the blank.

[0034] In a preferred embodiment, the three-sequence positive mold includes:

[0035] A three-stage male die punch sleeve fixed to the molding machine;

[0036] A three-sequence male die core is arranged at the front end of the three-sequence male die punch sleeve, and the end surface of the three-sequence male die core is provided with a cavity for forming the hexagonal head and flange surface of the blank;

[0037] The three-sequence punch ejector pin has a regular hexagonal cross section, which is passed through the three-sequence positive die punch sleeve from the tail end of the three-sequence positive die punch sleeve and extends into the cavity of the three-sequence positive die core, and is used to reduce the angle of the hexagonal head of the blank and complete the chamfering. The three-sequence punch ejector pin is located at the end face of the cavity of the three-sequence positive die core and is provided with a punch for initial upsetting of the countersunk hole on the head of the blank;

[0038] The three-sequence male die pad is arranged at the rear end of the three-sequence male die punch sleeve and is used to tighten the three-sequence die ejector rod;

[0039] The three-order negative mold comprises:

[0040] A three-sequence female die sleeve, fixedly mounted on the molding machine relative to the three-sequence male die sleeve;

[0041] A three-sequence female mold core is embedded in the end of the three-sequence female mold sleeve relative to the three-sequence male mold core, and a cavity for forming the flange surface of the blank and binding the rod portion is provided in the three-sequence female mold core;

[0042] The three-sequence female mold push rod passes through the three-sequence female mold sleeve and extends into the cavity of the three-sequence female mold core at one end of the three-sequence female mold sleeve away from the three-sequence female mold core, and the other end is fixedly connected to the three-sequence female mold push rod sleeve for pushing out the blank and shaping the tail of the blank.

[0043] In a preferred embodiment, the four-sequence positive mold includes:

[0044] A four-sequence male die punch sleeve is fixed to the molding machine, and a necking head capable of entering the four-sequence female die is provided at the end of the four-sequence male die punch sleeve;

[0045] The four-sequence male die core is arranged in the necking head of the four-sequence male die punch sleeve, and the end surface of the two-sequence male die core is provided with a cavity for constraining the hexagonal head and flange surface of the blank;

[0046] The four-sequence punch ejector pin has a regular hexagonal cross section, which is formed by the tail end of the four-sequence male die punch sleeve and extends into the cavity of the four-sequence male die core, and is used to constrain the hexagonal head end face of the blank, and the three-sequence punch ejector pin is located at the end face of the cavity of the three-sequence male die core and is provided with a punch for final upsetting of the countersunk hole of the blank head;

[0047] The four-sequence male die pad is arranged at the rear end of the four-sequence male die punch sleeve and is used to tighten the four-sequence die ejector rod;

[0048] The four-order negative mold includes:

[0049] A four-sequence female die sleeve, fixed to the molding machine relative to the four-sequence male die sleeve;

[0050] The four-sequence female mold slider seat is movably arranged in the four-sequence female mold sleeve, and an inverted cone-shaped through hole is arranged therein;

[0051] A three-piece mold core, a truncated cone composed of three pieces of mold core, in which a cavity for constraining the flange surface and the rod of the blank is provided, the three-piece mold core is movably arranged in the four-sequence female mold slider seat, is pushed by the four-sequence male mold punch sleeve and clamps the blank under the extrusion of the four-sequence female mold slider seat;

[0052] The inner cushion block of the four-sequence female mold is annular and movably arranged in the four-sequence female mold sleeve and located behind the four-sequence female mold slider seat;

[0053] The four-sequence female die core is embedded in the four-sequence female die inner pad, and is provided with an upsetting cavity for upsetting the rod part of the blank;

[0054] The movable cushion block of the four-sequence female mold is arranged in the four-sequence female mold sleeve and is located behind the cushion block inside the four-sequence female mold, and is used to abut against the cushion block inside the four-sequence female mold;

[0055] A spring and a spring seat, wherein the spring seat is fixedly mounted on the tail of the four-sequence female mold sleeve, and the spring seat abuts against the four-sequence female mold core, and the spring is arranged between the four-sequence female mold movable pad and the spring seat;

[0056] The ejector rod of the four-sequence female mold has one end arranged in the spring seat and the other end extending into the cavity of the four-sequence female mold core, and is used to shape the tail of the blank and push out the blank;

[0057] The four-sequence female mold round rod is arranged in the four-sequence female mold ejector rod and is used to limit the four-sequence female mold ejector rod and control the four-sequence female mold ejector rod to push the material.

[0058] Compared with the prior art, the beneficial effects of the utility model are:

[0059] The utility model utilizes the first three groups of positive molds and negative molds to realize the head forming and the rod forming of the product, and finally utilizes the four-sequence positive mold and the four-sequence negative mold to realize the roughening of the rod portion of the product. The four-sequence negative mold adopts a three-piece mold core to close the slider, and the pressure of the four-sequence positive mold can be used to push the three-piece mold core under the fiber of the slider seat to complete the mold closing. After the mold closing is completed, the mold closing structure is reset under the action of the spring and the round rod. This structural design realizes the demoulding of the product after the rod portion is roughened, so that the product is completed in one processing step, which not only improves the production efficiency of the product, but also saves product defects and the labor cost of the enterprise because one process is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0060] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative work, among which:

[0061] Figure 1 It is a mold closing state diagram of a first-order positive mold and a first-order negative mold provided by the utility model;

[0062] Figure 2 yes Figure 1 The blank forming diagram provided;

[0063] Figure 3 It is a mold closing state diagram of a two-sequence male mold and a two-sequence female mold provided by the utility model;

[0064] Figure 4 yes Figure 3 The blank forming diagram provided;

[0065] Figure 5 It is a mold closing state diagram of the three-sequence male mold and the three-sequence female mold provided by the utility model;

[0066] Figure 6 yes Figure 5 The blank forming diagram provided;

[0067] Figure 7 yes Figure 6 The left side view of the blank is provided;

[0068] Figure 8 It is a mold closing state diagram of the four-sequence positive mold and the four-sequence negative mold provided by the utility model;

[0069] Fig. 9 yes Figure 8 The blank forming diagram provided;

[0070] Fig.10 yes Figure 8A side view of the three-piece mold core is provided;

[0071] Fig.11 10 is a cross-sectional view of a three-piece mold core provided.

[0072] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0073] 1a—first-order male mold, 1a.1—first-order male mold punch sleeve, 1a.2—first-order male mold core, 1a.3—first-order punch ejector pin, 1a.4—first-order male mold cushion, 1b—first-order female mold, 1b.1—first-order female mold sleeve, 1b.2—first-order female mold core, 1b.3—first-order female mold ejector pin, 2a—second-order male mold, 2a.1—second-order male mold punch sleeve, 2a.2—second-order male mold mold core, 2a.3—secondary punching die ejector, 2a.4—secondary male mold cushion, 2b—secondary female mold, 2b.1—secondary female mold sleeve, 2b.2—secondary female mold core, 2b.3—secondary female mold ejector, 3a—thirdary male mold, 3a.1—thirdary male mold punch sleeve, 3a.2—thirdary male mold core, 3a.3—thirdary punching die ejector, 3a.4—thirdary male mold cushion, 3b —three-sequence female mold, 3b.1—three-sequence female mold sleeve, 3b.2—three-sequence female mold core, 3b.3—three-sequence female mold ejector rod, 4a—four-sequence male mold, 4a.1—four-sequence male mold punch sleeve, 4a.2—four-sequence male mold core, 4a.3—four-sequence die ejector rod, 4a.4—four-sequence male mold pad, 4b—four-sequence female mold, 4b.1—four-sequence female mold sleeve, 4b.2—four-sequence female mold slider seat , 4b.3—three-piece core, 4b.3.0—blind hole, 4b.3.1—limit pin, 4b.4—four-sequence female mold inner pad, 4b.5—four-sequence female mold core, 4b.6—four-sequence female mold movable pad, 4b.7—spring, 4b.8—spring seat, 4b.9—four-sequence female mold ejector rod, 4b.10—four-sequence female mold round rod, 4b.11—female mold slider seat cover. DETAILED DESCRIPTION

[0074] It should be understood that the specific embodiments described herein are only used to explain the present invention, and are not used to limit the present invention.

[0075] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0076] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention; the terms "install", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0077] In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0078] Embodiment 1

[0079] The present embodiment provides a cold heading forming die for hexagonal head flange non-slip screws, comprising four groups of male dies and four groups of female dies, wherein the four groups of male dies include a first-sequence male die 1a, a second-sequence male die 2a, a third-sequence male die 3a and a fourth-sequence male die 4a; the four groups of female dies include a first-sequence female die 1b, a second-sequence female die 2b, a third-sequence female die 3b and a fourth-sequence female die 4b corresponding to the first-sequence male die, the second-sequence male die, the third-sequence male die and the fourth-sequence male die respectively.

[0080] The four groups of male and female dies are respectively installed on the multi-station bolt forming machine. The blank is moved between the four groups of male and female dies through the clamping system of the forming machine, and the blank is sequentially preformed into a head, a head forming cylinder and a flange, a hexagonal and a rod part, and a rough rod is produced by closing the mold.

[0081] Specifically, as attached Figure 1 As shown, the first-order male mold 1a comprises a first-order male mold sleeve 1a.1, a first-order male mold core 1a.2, a first-order die ejector rod 1a.3 and a first-order male mold pad 1a.4, wherein:

[0082] A first-order male die punch sleeve is fixed to the forming machine; a first-order male die core is arranged at the front end of the first-order male die punch sleeve; a first-order die ejector rod passes through the first-order male die punch sleeve and the first-order male die core from the tail end of the first-order male die punch sleeve; a first-order male die pad is arranged at the rear end of the first-order male die punch sleeve and is used to tighten the first-order die ejector rod.

[0083] Specifically, as attached Figure 1As shown, the first-order female mold 1b includes a first-order female mold sleeve 1b.1, a first-order female mold core 1b.2 and a first-order female mold ejector rod 1b.3, wherein:

[0084] A first-order female die sleeve is fixedly installed on the forming machine relative to the first-order male die punch sleeve; a first-order female die core is embedded in the end of the first-order female die sleeve relative to the first-order male die core, and the first-order female die core is provided with a cavity for upsetting the head of the blank and restraining the rod; a first-order female die push rod passes through the first-order female die sleeve and extends into the cavity of the first-order female die core from one end of the first-order female die sleeve away from the first-order female die core, and the other end is fixedly connected to the first-order female die push rod sleeve for pushing out the blank and shaping the tail of the blank.

[0085] When the first sequence is preforming the head, the clamping system of the forming machine sends the blank to the die mouth of the first sequence female die. When the main slide of the forming machine moves toward the first sequence female die, the blank is pushed into the first sequence female die core under the action of the first sequence male die. The main slide continues to move forward to the front point, and the material is compressed and deformed. The first sequence punching die ejector rod, the first sequence female die core, and the first sequence female die ejector rod jointly complete the preforming of the blank head and the binding of the rod part. The formed part is as shown in the attached figure. Figure 2 shown.

[0086] Specifically, as attached Figure 3 As shown, the second-order male mold 2a includes a second-order male mold sleeve 2a.1, a second-order male mold core 2a.2, a second-order mold ejector rod 2a.3 and a second-order male mold cushion block 2a.4, wherein:

[0087] The second-sequence male die punch sleeve is fixed to the forming machine; the second-sequence male die core is arranged at the front end of the second-sequence male die punch sleeve, and the end face of the second-sequence male die core is provided with a cavity for pre-forming the head of the blank; the second-sequence die push rod passes through the second-sequence male die punch sleeve from the tail end of the second-sequence male die punch sleeve and extends into the cavity of the second-sequence male die core; the second-sequence male die pad is arranged at the rear end of the second-sequence male die punch sleeve, which is used to limit the second-sequence die push rod.

[0088] Specifically, as attached Figure 3 As shown, the second-order female mold 2b includes a second-order female mold sleeve 2b.1, a second-order female mold core 2b.2 and a second-order female mold ejector rod 2b.3, wherein:

[0089] The second-order female mold sleeve is fixedly installed on the forming machine relative to the second-order male mold punch sleeve; the second-order female mold core is embedded in the end of the second-order female mold sleeve relative to the second-order male mold core, and the second-order female mold core is provided with a cavity for pre-forming the flange surface of the blank and binding the rod; the second-order female mold push rod passes through the second-order female mold sleeve and extends into the cavity of the second-order female mold core from one end of the second-order female mold sleeve away from the second-order female mold core, and the other end is fixedly connected to the second-order female mold push rod sleeve for pushing out the blank and shaping the tail of the blank.

[0090] When the second-order forming of the head cylinder and flange, the clamping system of the forming machine sends the blank to the die mouth of the second-order female die. When the main slide of the forming machine moves toward the second-order female die, the blank is pushed into the second-order female die core under the action of the second-order male die, and the main slide continues to move forward to the front point. The material is compressed and deformed. The second-order male die core, the second-order punch ejector rod, the second-order female die core and the second-order female die ejector rod jointly complete the forming of the head cylinder and flange of the blank, as well as the binding rod of the rod. The formed parts are shown in the attached figure. Figure 4 shown.

[0091] Specifically, as attached Figure 5 As shown, the three-sequence male mold 3a includes a three-sequence male mold sleeve 3a.1, a three-sequence male mold core 3a.2, a three-sequence male mold ejector rod 3a.3 and a three-sequence male mold pad 3a.4, wherein:

[0092] The three-sequence male die punch sleeve is fixed on the forming machine; the three-sequence male die core is arranged at the front end of the three-sequence male die punch sleeve, and the end face of the three-sequence male die core is provided with a cavity for forming the hexagonal head and flange surface of the blank; the three-sequence die push rod, whose cross section is a regular hexagon, passes through the three-sequence male die punch sleeve from the tail end of the three-sequence male die punch sleeve and extends into the cavity of the three-sequence male die core, and is used to reduce the angle of the hexagonal head of the blank and complete the chamfer, and the three-sequence die push rod is located at the end face of the cavity of the three-sequence male die core and is provided with a punch for the initial upsetting of the countersink of the head of the blank; the three-sequence male die pad is arranged at the rear end of the three-sequence male die punch sleeve, and is used to tighten the three-sequence die push rod.

[0093] Specifically, as attached Figure 5 As shown, the three-sequence female mold 3b includes a three-sequence female mold sleeve 3b.1, a three-sequence female mold core 3b.2 and a three-sequence female mold ejector rod 3b.3, wherein:

[0094] The three-sequence female mold sleeve is fixedly installed on the forming machine relative to the three-sequence male mold punch sleeve; the three-sequence female mold core is embedded in the end of the three-sequence female mold sleeve relative to the three-sequence male mold core, and the three-sequence female mold core is provided with a cavity for forming the flange surface of the blank and binding the rod; the three-sequence female mold ejector rod, which passes through the three-sequence female mold sleeve and extends into the cavity of the three-sequence female mold core at one end of the three-sequence female mold sleeve away from the three-sequence female mold core, and the other end is fixedly connected to the three-sequence female mold ejector rod sleeve for pushing out the blank and shaping the tail of the blank.

[0095] When the three-sequence process is shrinking the hexagon and the rod, the clamping system of the forming machine sends the blank to the die mouth of the three-sequence female die. When the main slide of the forming machine moves toward the three-sequence female die, the blank is pushed into the core of the three-sequence female die under the action of the three-sequence male die. The main slide continues to move forward to the front point, and the material is compressed and deformed. The three-sequence male die core, the three-sequence punch ejector rod, the three-sequence female die core and the three-sequence female die ejector rod jointly complete the hexagonal forming of the blank's head and the binding of the rod. The formed part is as shown in the attached figure. Figure 6and attached Figure 7 shown.

[0096] Specifically, as attached Figure 8 As shown, the four-sequence male mold 4a includes a four-sequence male mold sleeve 4a.1, a four-sequence male mold core 4a.2, a four-sequence male mold ejector rod 4a.3 and a four-sequence male mold pad 4a.4, wherein:

[0097] The four-sequence male die punch sleeve is fixed on the forming machine, and the end of the four-sequence male die punch sleeve is provided with a necking head that can enter the four-sequence female die; the four-sequence male die core is arranged in the necking head of the four-sequence male die punch sleeve, and the end face of the two-sequence male die core is provided with a cavity for constraining the hexagonal head and flange surface of the blank; the four-sequence die push rod has a regular hexagonal cross section, which passes through the four-sequence male die punch sleeve from the tail end of the four-sequence male die punch sleeve and extends into the cavity of the four-sequence male die core, which is used to constrain the hexagonal head end face of the blank, and the three-sequence die push rod is located at the end face of the cavity of the three-sequence male die core and is provided with a punch for final upsetting the countersunk hole of the blank head; the four-sequence male die pad is arranged at the rear end of the four-sequence male die punch sleeve, which is used to tighten the four-sequence die push rod.

[0098] Specifically, as attached Figure 8 As shown, the four-sequence female mold 4b includes a four-sequence female mold sleeve 4b.1, a four-sequence female mold slider seat 4b.2, a three-piece mold core 4b.3, a four-sequence female mold inner pad 4b.4, a four-sequence female mold core 4b.5, a four-sequence female mold movable pad 4b.6, a spring 4b.7 and a spring seat 4b.8, a four-sequence female mold ejector rod 4b.9 and a four-sequence female mold round rod 4b.10, wherein:

[0099] The four-sequence female die sleeve is fixed to the forming machine relative to the four-sequence male die punch sleeve; the four-sequence female die slider seat is movably arranged in the four-sequence female die sleeve, and is provided with an inverted cone-shaped through hole; the three-piece die core is a truncated cone composed of three-piece die cores, and is provided with a cavity for constraining the flange surface and the rod portion of the blank, and the three-piece die core is movably arranged in the four-sequence female die slider seat, pushed by the four-sequence male die punch sleeve and clamped under the extrusion of the four-sequence female die slider seat; the four-sequence female die inner pad is annular, movably arranged in the four-sequence female die sleeve and located behind the four-sequence female die slider seat; the four-sequence female die core is embedded in the four-sequence female die inner pad, and is provided with a cavity for upsetting the material The upsetting cavity of the blank rod part; the movable pad block of the four-sequence female mold is arranged in the four-sequence female mold sleeve and is located behind the pad block inside the four-sequence female mold, and is used to abut the pad block inside the four-sequence female mold; the spring and the spring seat, the spring seat is fixedly installed on the tail of the four-sequence female mold sleeve, and the spring seat abuts the four-sequence female mold core, and the spring is arranged between the movable pad block of the four-sequence female mold and the spring seat; one end of the four-sequence female mold ejector rod is arranged in the spring seat, and the other end extends to the cavity of the four-sequence female mold core, which is used to shape the tail of the blank and push the blank out; the four-sequence female mold round bar is arranged in the four-sequence female mold ejector rod, which is used to limit the four-sequence female mold ejector rod and control the four-sequence female mold ejector rod to push the material.

[0100] Preferably, as attached Fig.10 and attached Fig.11 As shown, in the three-piece mold core 4b.3, both end faces of each mold core are provided with blind holes 4b.3.0, and after two adjacent mold cores are assembled, they are limited by the limiting pins 4b.3.1 in the blind holes.

[0101] Preferably, as attached Figure 8 As shown, the female mold also includes a female mold slider seat cover plate 4b.11, which is fixedly installed on the four-sequence female mold slider seat 4b.2 and is used to limit the three-piece mold core.

[0102] When the four-sequence mold is closed and the rough rod of the blank is discharged, the clamping system of the forming machine sends the blank to the die mouth of the four-sequence female mold. When the main slide of the forming machine moves toward the four-sequence female mold, the blank is pushed into the three-piece mold core and the four-sequence female mold core by the four-sequence male mold. The four-sequence male mold contacts the three-piece mold core and pushes the three-piece mold core along the four-sequence female mold slide seat to complete the mold closing. The four-sequence male mold continues to move forward to the front point driven by the main slide. Under the action of the four-sequence male mold core, the four-sequence punch ejector rod, the three-piece mold core, the four-sequence female mold core, and the four-sequence female mold ejector rod, the head is bundled and the rod is roughened. The formed part is as shown in the attached figure Figure 6 and attached Figure 7 shown.

[0103] When opening the mold, under the push of the spring, the active gasket of the four-sequence female mold pushes the inner gasket of the four-sequence female mold, the inner gasket of the four-sequence female mold pushes the four-sequence female mold slider seat, the four-sequence female mold slider seat drives the female mold slider seat cover and the three-piece mold core to reset, so that the three-piece mold core is opened. Finally, the four-sequence female mold round rod pushes the four-sequence female mold ejector to push out the product.

[0104] The four-sequence male die and the four-sequence female die in this embodiment can be used for upsetting the tail of the screw rod, and can form a set of screw rod upsetting dies. The specific structure is attached. Figure 8 To Attachment Fig.11 The four-sequence positive and negative mold structures are shown.

[0105] The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A screw rod upsetting die, comprising a male die and a female die fixedly mounted on a multi-station forming machine, characterized in that: The end of the male mold is provided with a necking head which can enter the female mold, and the necking head is provided with a male mold core for constraining the head of the blank; The female mold includes a female mold sleeve, a female mold slider seat and a female mold core assembly which are movably arranged in the female mold sleeve in sequence, a spring and a spring seat fixedly arranged at the rear end of the female mold sleeve, a three-piece mold core movably arranged in the female mold slider seat, and a female mold push rod. The female mold slider seat is provided with an inverted cone through hole, the three-piece mold core is a truncated cone composed of three mold cores, and a cavity for constraining the rod portion of the blank is provided therein, the female mold core is provided with an upsetting cavity for roughening the rod portion of the blank, the spring is arranged between the female mold core and the spring seat, one end of the female mold push rod passes through the spring seat and extends into the upsetting cavity of the female mold core, which is used to shape the tail of the blank and push the blank out.

2. The screw rod upsetting die according to claim 1, characterized in that: The female mold core assembly comprises a female mold core and an inner cushion block, wherein the female mold core is embedded in the inner cushion block, and the inner cushion block is movably arranged in the female mold sleeve.

3. The screw rod upsetting die according to claim 2, characterized in that: The female mold further comprises a movable pad, which is arranged behind the inner pad, and the spring is arranged between the movable pad and the spring seat.

4. The screw rod upsetting die according to claim 1, characterized in that: In the three-piece mold core, both end faces of each mold core are provided with blind holes, and after two adjacent mold cores are assembled, they are limited by the limiting pins in the blind holes.

5. The screw rod upsetting die according to claim 1, characterized in that: The female mold also includes a female mold slider seat cover plate, which is fixedly installed on the female mold slider seat and is used to limit the three-piece mold core.

6. A cold heading die for hexagonal flange screws that do not fall out, characterized in that: include: Four groups of positive molds, including a one-sequence positive mold, a two-sequence positive mold, a three-sequence positive mold and a four-sequence positive mold; Four groups of female molds, including a first-order female mold, a second-order female mold, a third-order female mold and a fourth-order female mold corresponding to the first-order male mold, the second-order male mold, the third-order male mold and the fourth-order male mold, respectively, wherein the fourth-order male mold and the fourth-order female mold respectively adopt the male mold and the female mold structure in the screw rod upsetting mold according to any one of claims 1 to 5; The four groups of male and female dies are respectively installed on the multi-station bolt forming machine. The blank is moved between the four groups of male and female dies through the clamping system of the forming machine, and the blank is sequentially preformed into a head, a head forming cylinder and a flange, a hexagonal and a rod part, and a rough rod is produced by closing the mold.

7. The hexagonal head flange screw cold heading die according to claim 6, characterized in that: The first-order positive mold comprises: A first-order male die punch sleeve, fixed to the molding machine; A first-order male die core is arranged at the front end of the first-order male die punch sleeve; A first-order punching die ejector rod is connected from the tail end of the first-order male die punching sleeve to the first-order male die punching sleeve and the first-order male die core; The first-order male die pad is arranged at the rear end of the first-order male die punch sleeve and is used to tighten the first-order die ejector pin; The first-order negative mold comprises: A first-order female die sleeve is fixedly installed on the molding machine relative to the first-order male die sleeve; A first-order female mold core is embedded in the end of the first-order female mold sleeve relative to the first-order male mold core, and a cavity for upsetting the head of the blank and binding the rod is provided in the first-order female mold core; A first-order female mold push rod, which passes through the first-order female mold sleeve and extends into the mold cavity of the first-order female mold core from one end of the first-order female mold sleeve away from the first-order female mold core, and the other end is fixedly connected to the first-order female mold push rod sleeve for pushing out the blank and shaping the tail of the blank.

8. The hexagonal head flange screw cold heading die according to claim 6, characterized in that: The two-order positive mold comprises: A second-order male die punch sleeve is fixed to the molding machine; A second-order male mold core is arranged at the front end of the second-order male mold punch sleeve, and the end surface of the second-order male mold core is provided with a cavity for preforming the head of the blank; The second-order punch ejector pin passes through the second-order punch sleeve from the tail end of the second-order male die punch sleeve and extends into the cavity of the second-order male die core; The second-order male die pad is arranged at the rear end of the second-order male die punch sleeve and is used to limit the second-order die ejector rod; The two-order negative mold comprises: A second-order female die sleeve, fixedly installed on the molding machine relative to the second-order male die sleeve; A second-order female mold core is embedded in the end of the second-order female mold sleeve relative to the second-order male mold core, and a cavity for preforming the flange surface of the blank and binding the rod portion is provided in the second-order female mold core; The second-order female mold push rod passes through the second-order female mold sleeve and extends into the mold cavity of the second-order female mold core at one end of the second-order female mold sleeve away from the second-order female mold core. The other end is fixedly connected to the second-order female mold push rod sleeve for pushing out the blank and shaping the tail of the blank.

9. The hexagonal head flange screw cold heading die according to claim 6, characterized in that: The three-sequence positive mold comprises: A three-stage male die punch sleeve fixed to the molding machine; A three-sequence male die core is arranged at the front end of the three-sequence male die punch sleeve, and the end surface of the three-sequence male die core is provided with a cavity for forming the hexagonal head and flange surface of the blank; The three-sequence punch ejector pin has a regular hexagonal cross section, which is passed through the three-sequence positive die punch sleeve from the tail end of the three-sequence positive die punch sleeve and extends into the cavity of the three-sequence positive die core, and is used to reduce the angle of the hexagonal head of the blank and complete the chamfering. The three-sequence punch ejector pin is located at the end face of the cavity of the three-sequence positive die core and is provided with a punch for initial upsetting of the countersunk hole on the head of the blank; The three-sequence male die pad is arranged at the rear end of the three-sequence male die punch sleeve and is used to tighten the three-sequence die ejector rod; The three-order negative mold comprises: A three-sequence female die sleeve, fixedly mounted on the molding machine relative to the three-sequence male die sleeve; A three-sequence female mold core is embedded in the end of the three-sequence female mold sleeve relative to the three-sequence male mold core, and a cavity for forming the flange surface of the blank and binding the rod portion is provided in the three-sequence female mold core; The three-sequence female mold push rod passes through the three-sequence female mold sleeve and extends into the cavity of the three-sequence female mold core at one end of the three-sequence female mold sleeve away from the three-sequence female mold core, and the other end is fixedly connected to the three-sequence female mold push rod sleeve for pushing out the blank and shaping the tail of the blank.

10. The cold heading die for hexagonal head flange screws according to claim 6, characterized in that: The four-sequence positive mold comprises: A four-sequence male die punch sleeve is fixed to the molding machine, and a necking head capable of entering the four-sequence female die is provided at the end of the four-sequence male die punch sleeve; The four-sequence male die core is arranged in the necking head of the four-sequence male die punch sleeve, and the end surface of the two-sequence male die core is provided with a cavity for constraining the hexagonal head and flange surface of the blank; The four-sequence punch ejector pin has a regular hexagonal cross section, which is formed by the tail end of the four-sequence male die punch sleeve and extends into the cavity of the four-sequence male die core, and is used to constrain the hexagonal head end face of the blank, and the three-sequence punch ejector pin is located at the end face of the cavity of the three-sequence male die core and is provided with a punch for final upsetting of the countersunk hole of the blank head; The four-sequence male die pad is arranged at the rear end of the four-sequence male die punch sleeve and is used to tighten the four-sequence die ejector rod; The four-order negative mold includes: A four-sequence female die sleeve, fixed to the molding machine relative to the four-sequence male die sleeve; The four-sequence female mold slider seat is movably arranged in the four-sequence female mold sleeve, and an inverted cone-shaped through hole is arranged therein; A three-piece mold core, a truncated cone composed of three pieces of mold core, in which a cavity for constraining the flange surface and the rod of the blank is provided, the three-piece mold core is movably arranged in the four-sequence female mold slider seat, is pushed by the four-sequence male mold punch sleeve and clamps the blank under the extrusion of the four-sequence female mold slider seat; The inner cushion block of the four-sequence female mold is annular and movably arranged in the four-sequence female mold sleeve and located behind the four-sequence female mold slider seat; The four-sequence female die core is embedded in the four-sequence female die inner pad, and is provided with an upsetting cavity for upsetting the rod part of the blank; The movable cushion block of the four-sequence female mold is arranged in the four-sequence female mold sleeve and is located behind the cushion block inside the four-sequence female mold, and is used to abut against the cushion block inside the four-sequence female mold; A spring and a spring seat, wherein the spring seat is fixedly mounted on the tail of the four-sequence female mold sleeve, and the spring seat abuts against the four-sequence female mold core, and the spring is arranged between the four-sequence female mold movable pad and the spring seat; The ejector rod of the four-sequence female mold has one end arranged in the spring seat and the other end extending into the cavity of the four-sequence female mold core, and is used to shape the tail of the blank and push out the blank; The four-sequence female mold round rod is arranged in the four-sequence female mold ejector rod and is used to limit the four-sequence female mold ejector rod and control the four-sequence female mold ejector rod to push the material.

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