High-strength bolt head pre-upsetting die and using method thereof

Abstract

The invention discloses a high-strength bolt head pre-upsetting die and a using method thereof.The head pre-upsetting die comprises an upper bottom plate, a lower bottom plate and a material returning cross beam, an upper punch is installed on the upper bottom plate, a tail punch, a material ejecting punch and an adjusting pad are arranged on the lower bottom plate, a lower round die outer sleeve is arranged on the adjusting pad, and a lower die is arranged in the lower round die outer sleeve; and the upper bottom plate, the lower bottom plate and the material returning cross beam are connected together through pull rods. Compared with the prior art, the head pre-upsetting die has the positive effects that 1, the head pre-upsetting die is convenient to change, and products with different sizes can be produced only by replacing the upper punch, the lower die and the guide die; and 2, the head pre-upsetting die can finely adjust the height of the head by replacing the adjusting pad, and is simple and convenient to operate. And 3, the head pre-upsetting die positioning structure is good in use effect, the size of a produced product is stable, and the head pre-upsetting die positioning structure can be widely used in high-strength bolt head pre-upsetting production.

Description

Technical Field

[0001] The invention relates to a high-strength bolt head pre-upsetting die and a use method thereof. Background Art

[0002] In the production and application of high-strength bolts, there are bolts with large head upset ratios. Upset ratio refers to the ratio of the length of the part of the blank that needs to be deformed to its diameter. In practical applications, the upset ratio directly affects the quality of the product and the service life of the mold. When the upset ratio is too large, longitudinal bending may occur in one upsetting, resulting in defects such as interlayers in the product. Therefore, it is necessary to pre-upset products with large upsetting ratios. The process is as follows: Figure 1 As shown, the present invention is a pre-upsetting die designed for the pre-upsetting process. Summary of the invention

[0003] In order to overcome the above-mentioned shortcomings of the prior art, the present invention provides a high-strength bolt head pre-upsetting die and a method for using the same.

[0004] The technical solution adopted by the present invention to solve its technical problem is: a high-strength bolt head pre-upsetting die, including an upper base plate, a lower base plate and a material return beam, an upper punch is installed on the upper base plate, a tail punch, a top punch and an adjustment pad are arranged on the lower base plate, a lower circular die sleeve is arranged on the adjustment pad, a lower die is arranged in the lower circular die sleeve, and the upper base plate, the lower base plate and the material return beam are connected together by a pull rod.

[0005] Furthermore, a guide die is arranged in the lower circular die jacket.

[0006] Furthermore, the upper punch is connected to the upper base plate through an upper die seat.

[0007] Furthermore, the lower die and the lower circular die outer sleeve are assembled together through interference fit.

[0008] Furthermore, the material-removing crossbeam and the pull rod are fixed together via a threaded connection.

[0009] Furthermore, the pull rod and the upper base plate are fixed together through a threaded connection.

[0010] Furthermore, a material-returning tail punch is arranged on the material-returning crossbeam.

[0011] Furthermore, the upper base plate is connected to the equipment slider via bolts.

[0012] The present invention also provides a method for using a high-strength bolt head pre-upsetting die, comprising the following steps:

[0013] Step 1: Install the upper punch in the upper die base, and then connect the upper die base to the upper base plate through bolts;

[0014] Step 2: Place the material return tail punch on the material return beam, and then fix the material return beam and the pull rod together through threaded connection;

[0015] Step 3: Set the tail punch and the top punch on the lower bottom plate, then install the lower bottom plate and the tie rod together, and then fix the tie rod and the upper bottom plate together through threaded connection;

[0016] Step 4: Assemble the lower die and the lower round die jacket together through interference fit, and then place the workpiece in the lower die;

[0017] Step 5: Place the lower round mold jacket on the adjustment pad, and then place the adjustment pad on the lower bottom plate;

[0018] Step 6: Place the lower base plate on the equipment workbench and connect the upper base plate to the equipment slider with bolts;

[0019] Step 7: The equipment slider moves downward, driving the upper punch to move downward, and cooperates with the top punch and the tail punch to extrude the workpiece so that the workpiece is formed in the lower die;

[0020] Step 8. After forming, the equipment slider moves upward, driving the pull rod, the material return beam and the material return tail punch upward together. After moving upward for a distance, the material return tail punch contacts the tail punch and drives the ejection punch upward to eject the workpiece.

[0021] Compared with the prior art, the present invention has the following positive effects:

[0022] 1. The head pre-forging die of the present invention is easy to change, and products of different sizes can be produced by simply replacing the upper punch, the lower die and the guide die.

[0023] 2. The head pre-forging die of the present invention can fine-tune the head height by replacing the adjustment pad, and the operation is simple and convenient.

[0024] 3. The head pre-upsetting die positioning structure of the present invention has good use effect, and the product produced has stable size, and can be widely used in the production of bolt head forming with a large upsetting ratio. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The present invention will now be described by way of example with reference to the accompanying drawings, in which:

[0026] Figure 1 It is a schematic diagram of the pre-upsetting process for products with a large upsetting ratio;

[0027] Figure 2 It is a structural schematic diagram of the head pre-upsetting die of the present invention;

[0028] The reference numerals in the figure include: upper base plate 1, upper die base 2, upper punch 3, lower die 4, lower circular die sleeve 5, guide die 6, ejector punch 7, adjustment pad 8, pull rod 9, lower base plate 10, tail punch 11, material return tail punch 12, and material return cross beam 13. DETAILED DESCRIPTION

[0029] A high strength bolt head pre-upsetting die, such as Figure 2 As shown, it includes: an upper base plate 1, an upper die seat 2, an upper punch 3, a lower die 4, a lower round die jacket 5, a guide die 6, a top punch 7, an adjustment pad 8, a pull rod 9, a lower base plate 10, a tail punch 11, a material return tail punch 12, and a material return crossbeam 13, wherein:

[0030] The upper punch 3 is connected to the upper base plate 1 through the upper die seat 2, the material return tail punch 12 is placed on the material return beam 13, the material return beam 13 is fixed to the pull rod 9 through a threaded connection, the pull rod 9 is fixed to the upper base plate 1 through a threaded connection, the upper base plate 1 is connected to the equipment slider through bolts, the lower die 4 and the lower circular die jacket 5 are assembled together through interference fit, a guide die 6 is arranged in the lower circular die jacket 5, the lower circular die jacket 5 is placed on the adjustment pad 8, the adjustment pad 8 is placed on the lower base plate 10, and the tail punch 11 and the top punch 7 are arranged on the lower base plate 10.

[0031] The method for using the head pre-upsetting die of the present invention comprises the following steps:

[0032] Step 1: Install the upper punch 3 in the upper die base 2, and then connect the upper die base 2 to the upper base plate 1 through bolts;

[0033] Step 2: Place the material return tail punch 12 on the material return beam 13, and then fix the material return beam 13 and the pull rod 9 together through threaded connection;

[0034] Step 3: Set the tail punch 11 and the top punch 7 on the lower bottom plate 10, then install the lower bottom plate 10 and the tie rod 9 together, and then fix the tie rod 9 and the upper bottom plate 1 together through threaded connection;

[0035] Step 4: Place the guide die 6 in the lower circular die jacket 5, then assemble the lower die 4 and the lower circular die jacket 5 together through interference fit, then place the workpiece in the lower die 4 and position it through the guide die 6;

[0036] Step 5: Place the lower round mold jacket 5 on the adjustment pad 8, and then place the adjustment pad 8 on the lower base plate 10;

[0037] Step 6: Place the lower base plate 10 on the equipment workbench, and connect the upper base plate 1 to the equipment slider by bolts;

[0038] Step 7: The equipment slide moves downward, driving the upper punch 3 to move downward, and cooperates with the top punch 7 and the tail punch 11 to extrude the workpiece so that the workpiece is formed in the lower die 4;

[0039] Step 8. After forming, the equipment slider moves upward, driving the pull rod 9 and the material return beam 13 connected to the pull rod 9 upward. The material return beam 13 drives the material return tail punch 12 upward. After moving up a certain distance, the material return tail punch 12 contacts the tail punch 11 and drives the ejection punch 7 upward to eject the workpiece.

[0040] The present invention can realize rapid mold change by replacing the upper punch 3, the lower die 4 and the guide die 6; and can fine-tune the height of the head by replacing the adjustment pad 8, and the adjustment is simple and convenient.

Claims

1. A high-strength bolt head pre-upsetting die, characterized in that: It includes an upper bottom plate, a lower bottom plate and a material-returning crossbeam. An upper punch is installed on the upper bottom plate, a tail punch, a material-returning punch and an adjustment pad are arranged on the lower bottom plate, a lower circular die jacket is arranged on the adjustment pad, a lower die is arranged in the lower circular die jacket, and the upper bottom plate, the lower bottom plate and the material-returning crossbeam are connected together by a pull rod.

2. A high-strength bolt head pre-upsetting die according to claim 1, characterized in that: A guide die is arranged in the lower circular die housing.

3. A high-strength bolt head pre-upsetting die according to claim 1, characterized in that: The upper punch is connected with the upper base plate through an upper die seat.

4. A high-strength bolt head pre-upsetting die according to claim 1, characterized in that: The lower die and the lower circular die outer sleeve are assembled together through interference fit.

5. The high-strength bolt head pre-upsetting die according to claim 1, characterized in that: The material-returning crossbeam and the pull rod are fixed together through threaded connection.

6. A high-strength bolt head pre-upsetting die according to claim 1, characterized in that: The pull rod and the upper base plate are fixed together through threaded connection.

7. The high-strength bolt head pre-upsetting die according to claim 1, characterized in that: A material return tail punch is set on the material return beam.

8. The high-strength bolt head pre-upsetting die according to claim 1, characterized in that: The upper base plate is connected to the equipment slider via bolts.

9. A method for using a high-strength bolt head pre-upsetting die, characterized in that: The steps include: Step 1: Install the upper punch in the upper die base, and then connect the upper die base to the upper base plate through bolts; Step 2: Place the material return tail punch on the material return beam, and then fix the material return beam and the pull rod together through threaded connection; Step 3: Set the tail punch and the top punch on the lower bottom plate, then install the lower bottom plate and the tie rod together, and then fix the tie rod and the upper bottom plate together through threaded connection; Step 4: Assemble the lower die and the lower round die jacket together through interference fit, and then place the workpiece in the lower die; Step 5: Place the lower round mold jacket on the adjustment pad, and then place the adjustment pad on the lower bottom plate; Step 6: Place the lower base plate on the equipment workbench and connect the upper base plate to the equipment slider with bolts; Step 7: The equipment slider moves downward, driving the upper punch to move downward, and cooperates with the top punch and the tail punch to extrude the workpiece so that the workpiece is formed in the lower die; Step 8. After forming, the equipment slider moves upward, driving the pull rod, the material return beam and the material return tail punch upward together. After moving upward for a distance, the material return tail punch contacts the tail punch and drives the ejection punch upward to eject the workpiece.

10. The method for using the high-strength bolt head pre-upsetting die according to claim 9, characterized in that: A guide die is placed in the lower round die housing to position the workpiece by means of the guide die when the workpiece is placed.

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