Cold heading die for square-head bolt for automobile

Abstract

The utility model relates to a square-head bolt cold heading die for an automobile, which belongs to the technical field of bolt cold stamping and is characterized in that an upper die handle is fixedly arranged at the central position of the upper part of an upper top plate through a screw, an upper die is arranged at the central position of the lower part of the upper top plate through a screw, and guide sleeves are embedded at the left side and the right side of the upper die below the upper top plate; a left guide pillar and a right guide pillar are arranged above the lower bottom plate through screws, and the upper die and the lower die form a cavity for stamping bolts; the upper top plate is fixed above a middle beam of an oil press through a bolt and a clamping plate, the lower bottom plate is fixed on a working table top of the oil press through a bolt and a clamping plate, steel bar broken materials cut into certain specifications are placed in the lower die, a switch button of the oil press is started, the upper die rapidly extrudes the steel bar broken materials in the lower die downwards, and bolt forming is completed at a time. The rubber balls are used for buffering the buffering force of the lower die and the lower bottom plate, so that the internal stress of the lower die is reduced, and the design life of the lower die can normally meet the requirement of 120 thousand times of production.

Description

Technical Field

[0001] The utility model relates to a cold heading die for square head bolts for automobiles, belonging to the technical field of bolt cold stamping. Background Art

[0002] At room temperature, the blank is placed in the mold of an automatic cold heading machine or a press, and pressure is applied to the mold. The relative movement of the upper and lower molds is used to deform the blank in the mold cavity, reduce the height, and increase the cross section. This pressure processing method is called cold heading for automatic cold heading machines and cold pressing for presses. In the fastener forming process, cold heading technology is a major processing technology and belongs to the category of metal pressure processing. In production, at room temperature, external force is applied to the metal to form the metal in a predetermined mold. This method is usually called cold heading. In fact, the forming of any fastener is not only achieved by cold heading. In the cold heading process, in addition to upsetting deformation, it is also accompanied by positive and negative extrusion, compound extrusion, punching, rolling and other deformation methods. In short, the cold heading method for processing fasteners and special-shaped parts is a processing method with a relatively high comprehensive economic benefit, and it is a processing method commonly used in the fastener industry.

[0003] The Chinese utility model patent discloses a bolt cold heading die set, with the authorization announcement number CN215033267U. The structure is described as follows: when in use, a mounting frame 6 is provided on the workbench 1, a crossbeam 7 is provided on the mounting frame 6, a first hydraulic device 5 on the crossbeam 7 drives an upper die 8 to close a lower die 9 in a mounting groove 22 of the workbench 1, so that the bolt is cold headed. During the cold heading process, impact and heat are generated. A baffle 20 is provided in the mounting groove 22, a buffer pad 21 is provided on the baffle 20, the lower die 9 squeezes the buffer pad 21, and the buffer pad 21 provides buffer protection for the lower die 9. A cold circulation pipe 10 is provided in the lower mold 9 and is connected to the heat dissipation device 3. A circulation pump 12 is provided on the water tank 11 of the heat dissipation device 3. The touch display screen 14 controls the power of the circulation pump 12. The circulation pump 12 presses water into the cold circulation pipe 10 through the connecting pipe 13 to take away the heat and then enters the water tank 11. A temperature sensor 15 is provided in the cold circulation pipe 10 to facilitate understanding the temperature of the lower mold 9. A demolding device 4 is provided below the mounting groove 22. The second hydraulic device 16 drives the telescopic rod 19 with a spring 18 to move. A ejector pin 17 is provided above the telescopic rod 19 to provide buffer protection for the ejector pin 17.

[0004] The disadvantage of this patent is that a cold circulation pipe 10 is provided in the lower die 9 and connected to the heat sink 3, and a circulation pump 12 is provided on the water tank 11 of the heat sink 3. During the batch process, the cold heading die will generate heat due to the extruded material. Cooling with water will gradually reduce the hardness of the lower die 9. Long-term use under the pressure of the cold heading bolts will cause brittle cracks, reduce the life of the die, and fail to meet the die design requirement of 120,000 times. Summary of the invention

[0005] In order to solve the problems existing in the prior art, the purpose of the utility model is to provide a cold heading die for square head bolts for automobiles, in which the upper die quickly squeezes the broken steel bar in the lower die downwards, completes the forming of the bolts at one time, takes the stamped bolts, and repeats the operation in sequence; the rubber ball is used to buffer the buffering force of the lower die and the lower base plate, thereby reducing the internal stress of the lower die, so that the design life of the lower die can normally reach the production requirement of 120,000 molds.

[0006] A cold heading die for square head bolts for automobiles, characterized in that it comprises an upper top plate 2 and a lower bottom plate 5; an upper die handle 1 is fixedly provided at the upper center position of the upper top plate 2 by screws, an upper die 11 is fixedly provided at the lower center position of the upper top plate 2 by screws, and guide sleeves 3 are inlaid on the left and right sides of the upper die 11 below the upper top plate 2; left and right guide columns 4 are provided above the lower bottom plate 5 by screws, a bottom plate 6, a rubber ball 9 and a fixed plate 8 are respectively provided below the lower bottom plate 5 by screws 7, the screw 7 passes upward through the lower bottom plate 5 and is fixedly connected to the lower die 10 above the lower bottom plate 5; the upper die 11 and the lower die 10 constitute a cavity for stamping bolts 13.

[0007] The upper die 11 and the lower die 10 are made of 45# steel material.

[0008] The guide sleeve 3 and the guide post 4 can be slidably matched.

[0009] The upper top plate 2 and the lower bottom plate 5 are made of 45# steel material.

[0010] The bottom of the lower mold 10 is provided with two buffer trays.

[0011] The screw rods 7 are divided into four groups.

[0012] The upper top plate 2 is fixed above the middle beam of the hydraulic press by bolts and clamps, and the lower bottom plate 5 is fixed to the work table of the hydraulic press by bolts and clamps. The 300-ton hydraulic press drives the stamping and manufacturing of bolts. The steel bar cut into a certain specification 12 is placed in the lower die 10, and the hydraulic press switch button is started. The upper die 11 quickly squeezes the steel bar cut 12 in the lower die 10 downward to complete the forming of the bolt 13 at one time. The stamped bolt 13 is taken out and the operation is repeated in sequence.

[0013] The rubber ball 9 is used to buffer the buffering force of the lower mold 10 and the lower base plate 5, thereby reducing the internal stress of the lower mold 10, so that the design life of the lower mold 10 can normally reach the production requirement of 120,000 molds. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a front view of the utility model.

[0015] Figure 2 The three-dimensional Figure 1 .

[0016] Figure 3 The three-dimensional Figure 2 .

[0017] Figure 4 It is a three-dimensional diagram of a steel bar cut 12 for cold stamping according to the present invention.

[0018] Figure 5 It is a three-dimensional diagram of a bolt 13 formed by cold stamping according to the present invention.

[0019] In the figure: upper die handle 1, upper top plate 2, guide sleeve 3, guide column 4, lower bottom plate 5, bottom plate 6, screw 7, fixed plate 8, rubber ball 9, lower die 10, upper die 11, steel bar cut 12, bolt 13. DETAILED DESCRIPTION

[0020] 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 in 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.

[0021] As attached Figure 1-5 As shown, a cold heading die for square head bolts for automobiles comprises an upper top plate 2 and a lower bottom plate 5; an upper die handle 1 is fixedly provided at the upper center position of the upper top plate 2 by screws, an upper die 11 is fixedly provided at the lower center position of the upper top plate 2 by screws, and guide sleeves 3 are inlaid on the left and right sides of the upper die 11 below the upper top plate 2; left and right guide columns 4 are fixedly provided at the upper part of the lower bottom plate 5 by screws, a bottom plate 6, a rubber ball 9 and a fixed plate 8 are respectively provided at the lower part of the lower bottom plate 5 by screw rods 7, and the screw rods 7 pass through the lower bottom plate 5 upwards and are fixedly connected to the lower die 10 above the lower bottom plate 5;

[0022] The upper die 11 and the lower die 10 constitute a cavity for punching the bolt 13 . The upper die 11 and the lower die 10 are made of 45# steel material. Two buffer plates are provided at the bottom of the lower die 10 .

[0023] The guide sleeve 3 and the guide post 4 can be slidably matched.

[0024] The upper top plate 2 and the lower bottom plate 5 are made of 45# steel material.

[0025] The screw rods 7 are divided into four groups.

[0026] The upper top plate 2 is fixed above the middle beam of the hydraulic press by bolts and clamps, and the lower bottom plate 5 is fixed to the worktable of the hydraulic press by bolts and clamps. The 300-ton hydraulic press drives the stamping and manufacturing of bolts. The steel bar cut into a certain specification 12 is placed in the lower die 10, and the hydraulic press switch button is started. The upper die 11 quickly squeezes the steel bar cut 12 in the lower die 10 downward to complete the forming of the bolt 13 at one time. The stamped bolt 13 is taken out, and the operation is repeated in sequence.

[0027] The embodiments of the present invention are provided for the purpose of illustration and description, and are not intended to be exhaustive or to limit the present invention to the disclosed forms. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments are selected and described to better illustrate the principles and practical applications of the present invention, and to enable those of ordinary skill in the art to understand the present invention and thereby design various embodiments with various modifications suitable for specific uses.

Claims

1. A cold heading die for square head bolts for automobiles, characterized in that: It comprises an upper top plate (2) and a lower bottom plate (5); an upper die handle (1) is fixedly provided at the upper center position of the upper top plate (2) by screws, an upper die (11) is fixedly provided at the lower center position of the upper top plate (2) by screws, and guide sleeves (3) are embedded on the left and right sides of the upper die (11) below the upper top plate (2); left and right guide columns (4) are fixedly provided at the upper side of the lower bottom plate (5) by screws, and a bottom plate (6), a rubber ball (9) and a fixed plate (8) are respectively provided at the lower side of the lower bottom plate (5) by screws (7), and the screw (7) passes through the lower bottom plate (5) upwards and is fixedly connected to the lower die (10) above the lower bottom plate (5); The upper die (11) and the lower die (10) form a cavity for punching the bolt (13).

2. The cold heading die for square head bolts for automobiles according to claim 1, characterized in that: The upper die (11) and the lower die (10) are made of 45# steel material.

3. The cold heading die for square head bolts for automobiles according to claim 1, characterized in that: The guide sleeve (3) and the guide post (4) can be slidably matched.

4. The cold heading die for square head bolts for automobiles according to claim 1, characterized in that: The upper top plate (2) and the lower bottom plate (5) are made of 45# steel material.

5. The cold heading die for square head bolts for automobiles according to claim 2, characterized in that: Two buffer trays are provided at the bottom of the lower mold (10).

6. The cold heading die for square head bolts for automobiles according to claim 1, characterized in that: The screw rods (7) are in four groups.

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