Thin rod piece cold heading punching rod protection tool

Abstract

The utility model relates to the technical field of fastener dies, and particularly discloses a thin rod piece cold heading punching rod protection tool which comprises a movable punching die, a punching rod, a protection sleeve, a push rod, a main die and a workpiece, the punching rod is slidably installed in the movable punching die, the protection sleeve is arranged on the side, located in an inner cavity of the movable punching die, of the punching rod, and the protection sleeve is in clearance fit with the movable punching die. The protective sleeve is provided with a through hole which is in sliding fit with the punching rod to limit the punching rod, a push rod used for pushing the punching rod is arranged in the protective sleeve in a sliding mode, the push rod abuts against the end face of the punching rod, a workpiece is installed in the main die, the movable punching die and the main die are coaxially arranged, and the protective sleeve is arranged in an inner cavity of the movable punching die to limit the punching rod. The push rod is arranged in the protective sleeve to push the punching rod to machine the workpiece, the punching rod and the push rod slide in the protective sleeve, the punching rod cannot be bent in the machining process and is effectively prevented from being broken, and the durability of the punching rod is improved.

Description

Technical Field

[0001] This utility model relates to the field of fastener mold technology, specifically a protective tooling for cold heading punches of thin rods. Background Technology

[0002] In existing cold heading processes, the portion of the punch located within the die cavity is suspended, such as... Figure 1 As shown in the figure, part M is the suspended part of the punch, which is unrestrained in the radial direction. A type of thin rod product has a small rod diameter and large head deformation. During cold heading, the punch is subjected to impact and lateral force, and the suspended part is prone to bending, which can lead to the breakage of the punch. To address this, we propose a protective tooling for the cold heading punch of thin rods. Utility Model Content

[0003] To address the shortcomings of existing technologies, the technical problem solved by this utility model is to provide a protective tooling for thin rod cold heading punches, thereby solving the problem that existing thin rod cold heading punches are prone to bending and breakage.

[0004] To solve the above problems, the technical solution adopted by this utility model is: a protective tooling for cold heading punches of thin rods, including a movable die, a punch, a protective sleeve, a push rod, a main die, and a workpiece. The punch is slidably installed in the movable die. A protective sleeve is provided on one side of the punch located in the inner cavity of the movable die. The protective sleeve is clearance-fitted with the movable die. The protective sleeve has a through hole that slides with the punch to limit the punch. A push rod for pushing the punch is slidably arranged in the protective sleeve. The push rod abuts against the end face of the punch. The workpiece is installed in the main die. The movable die and the main die are coaxially arranged.

[0005] Furthermore, the part where the punch meets the through hole of the protective sleeve is three-lobed, and the through hole is also three-lobed, with the protective sleeve and the punch fitting together with a clearance.

[0006] Furthermore, the push rod is three-lobed and fits the cavity of the protective sleeve, with a clearance fit between the push rod and the protective sleeve.

[0007] Furthermore, the push rod and the punch are coaxially arranged, and the radial dimension of the push rod is larger than that of the punch.

[0008] Furthermore, a movable die pin is installed above the movable die.

[0009] Furthermore, a push rod is slidably disposed within the main mold.

[0010] The beneficial effects of this solution are as follows: Compared with the prior art, the protective tooling for the thin rod cold heading punch of this utility model limits the punch by setting a protective sleeve in the inner cavity of the movable die, and a push rod is set in the protective sleeve to push the punch to process the workpiece. The punch and the push rod slide in the protective sleeve, and the punch will not bend during the processing, effectively preventing it from breaking and improving the durability of the punch. Attached Figure Description

[0011] Figure 1 Schematic diagram of existing punches and dies;

[0012] Figure 2 This is a schematic diagram of the overall structure of this utility model;

[0013] Figure 3 This is a schematic diagram of the protective sleeve of this utility model;

[0014] Figure 4 This is a schematic diagram of the push rod of this utility model;

[0015] Figure 5 This is a schematic diagram of the punch of this utility model;

[0016] In the diagram: 1-movable punch, 2-punch bar, 3-protective sleeve, 4-push rod, 5-main mold, 6-workpiece, 7-movable mold pin, 8-ejector rod. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0018] Implementation, for example, attached Figures 2 to 5 As shown: A protective fixture for cold heading punches of thin rods includes a movable die 1, a punch 2, a protective sleeve 3, a push rod 4, a main die 5, and a workpiece 6. The punch 2 is slidably installed inside the movable die 1. A protective sleeve 3 is provided on one side of the punch 2 located within the inner cavity of the movable die 1. The protective sleeve 3 has a clearance fit with the movable die 1. The protective sleeve 3 has a through hole that slides with the punch 2 to limit its movement. The part where the punch 2 mates with the through hole of the protective sleeve 3 is three-lobed, and the through hole is also three-lobed. The clearance fit between the protective sleeve 3 and the punch 2 allows the punch 2 to slide axially within the protective sleeve 3, preventing it from moving. Radial rotation or bending will occur. A push rod 4 for pushing the punch 2 is slidably arranged inside the protective sleeve 3. The push rod 4 abuts against the end face of the punch 2. The push rod 4 is generally three-lobed and adapted to the cavity of the protective sleeve 3. The push rod 4 and the protective sleeve 3 are clearance-fitted, so that the push rod 4 can only slide axially in the cavity of the protective sleeve 3. The push rod 4 and the punch 2 are coaxially arranged. The radial dimension of the push rod 4 is larger than that of the punch 2, which makes it easier for the push rod 4 to apply a pushing force to the punch 2 to process the workpiece 6. The workpiece 6 is installed in the main mold 5. The movable punch 1 is coaxially arranged with the main mold 5 so that the punch 2 and the workpiece 6 are coaxial.

[0019] A movable die pin 7 is installed above the movable die 1 to position the movable die 1, and an ejector rod 8 is slidably provided inside the main die 5 to eject the workpiece 6.

[0020] The specific implementation process is as follows:

[0021] In use, punch 2 and push rod 4 are inserted into protective sleeve 3 in sequence, and the three are placed together into the cavity of movable die 1. Movable die 1 is installed in the die holder of cold heading equipment. A spring is provided behind movable die 1 to push movable die 1 against main die 5, so that movable die 1 is kept in close contact with main die 5 before workpiece 6 is deformed. Movable die pin 7 is used to position movable die 1. Workpiece 6 is installed in main die 5. Cold heading equipment is started. Push rod 4 slides in protective sleeve 3 to apply pushing force to punch 2, thereby processing workpiece 6 to form workpiece 6. After processing, ejector rod 8 in main die 5 ejects workpiece 6. During cold heading, the radial direction of the die is restricted by protective sleeve 3, and bending deformation will not occur, which improves the durability of punch.

[0022] The above descriptions are merely embodiments of this utility model, and common knowledge regarding specific structures and characteristics is not elaborated upon here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the structure of this utility model, and these should also be considered within the scope of protection of this utility model. These modifications will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application shall be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A protective fixture for cold heading punches of thin rods, comprising a movable die, a punch, a protective sleeve, a push rod, a main die, and a workpiece, wherein the punch is slidably mounted within the movable die, characterized in that: The punch is provided with a protective sleeve on one side of the inner cavity of the movable die. The protective sleeve is clearance-fitted with the movable die. The protective sleeve has a through hole that slides with the punch to limit the punch. A push rod for pushing the punch is slidably arranged inside the protective sleeve. The push rod abuts against the end face of the punch. The workpiece is installed in the main die. The movable die is coaxially arranged with the main die.

2. The protective fixture for cold heading punches of thin rods according to claim 1, characterized in that: The punch and the through hole of the protective sleeve are in a three-lobed shape, and the through hole is also in a three-lobed shape. The protective sleeve and the punch are in a clearance fit.

3. The protective fixture for cold heading punches of thin rods according to claim 1, characterized in that: The push rod is three-lobed and fits the cavity of the protective sleeve, with a clearance fit between the push rod and the protective sleeve.

4. The protective fixture for cold heading punches of thin rods according to claim 1, characterized in that: The push rod and the punch are coaxially arranged, and the radial dimension of the push rod is larger than that of the punch.

5. The protective fixture for cold heading punches of thin rods according to claim 1, characterized in that: A movable die pin is installed above the movable die.

6. The protective fixture for cold heading punches of thin rods according to claim 1, characterized in that: A push rod is slidably installed inside the main mold.

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