Rapid positioning and locking device special for fixing backward extrusion die assembly

Abstract

According to the rapid positioning and locking device special for fixing the backward extrusion die assembly, a plurality of locking protruding blocks A are arranged on the outer wall of the circumference of the front end of a hollow die shaft, and locking splines B matched with the locking protruding blocks in number and shape are arranged on the inner wall of the corresponding connecting rear end of a connecting sleeve; a die assembly is installed in a front inner cavity of the connecting sleeve. The hollow die shaft and the die assembly are connected and fixed through the connecting sleeve, continuous extrusion production can be achieved without periodic die assembly and disassembly, a traditional backward extrusion conventional die assembly and disassembly mechanical arm is omitted, the equipment installation cost is saved, the backward extrusion production efficiency is greatly improved, and the production efficiency and the compact continuity are improved; and the extrusion tools are mutually fastened and connected, so that the connection is stable and reliable, the installation is convenient and fast, and the die replacement efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of metal material processing equipment, in particular to a quick positioning and locking device specially used for fixing a reverse extrusion die assembly. Background Art

[0002] Extrusion molding is a common molding method for aluminum alloy tube and rod profiles. Extrusion molding requires the use of an extruder to achieve its production. Extrusion includes two methods: forward extrusion and reverse extrusion. Forward extrusion is that the extrusion shaft is driven by hydraulic pressure to push the cast ingot forward in the extrusion barrel to force it to extrude from the die to form a tube and rod profile. An extrusion pad is set between the extrusion shaft and the aluminum cast rod to prevent the aluminum material from overflowing from the gap. The difference between reverse extrusion and forward extrusion is that the position of the cast rod relative to the extrusion barrel remains unchanged during extrusion, the extrusion die shaft is a hollow structure, and the end of the hollow die shaft pushes the die in the die shaft. The die gradually moves from the head end of the aluminum cast rod to the tail end, and the formed tube and rod profile is gradually formed in the hollow die shaft. The advantages of reverse extrusion are: no friction is generated between the cast rod and the extrusion barrel, so no additional extrusion force is consumed; in addition, there are many advantages such as high product size accuracy, uniform mechanical properties, fast extrusion speed, high yield rate, and no coarse grain ring; it is particularly suitable for extruding hard aluminum alloy tubes and rods.

[0003] In the existing traditional reverse extruder, the hollow die shaft and the extrusion die adopt a separate structure, that is, before extruding each aluminum cast rod, the die needs to be placed in, and after extruding an aluminum cast rod, the die needs to be removed. The removed die is transported from the end of the extrusion barrel to the beginning of the extrusion barrel for repeated use. This separate structure transportation greatly increases the non-extrusion time and the production efficiency is very low. In the existing literature on the fixed reverse extrusion tool assembly:

[0004] Document 1, A fixed reverse extrusion tool assembly; Application number: 202222609830.7; and Document 2, A self-expanding reverse extrusion tool for aluminum alloy; Application number: 202222612198.1, although the plum blossom-shaped locking structure is also used to realize the fixed connection between the reverse extrusion die and the extrusion shaft, in actual operation, it has the following disadvantages: 1. The reverse extrusion head cover needs to be carefully controlled to operate the twisting. If the twisting position is deviated, the positioning block cannot be directly embedded in the positioning groove, and the locking structure cannot play the maximum locking effect, affecting the locking reliability. However, due to the large weight and volume of the extrusion tool, it is necessary to use a crane to lift and position it, slowly and carefully adjust the position, and manually insert the lever to twist the angle for installation. The position of the internal plum blossom locking structure cannot be observed, and the installation is difficult; 2. The neck of the reverse extrusion head cover in the existing documents is a shrinking neck structure, which increases the weak link of the entire extrusion tool. From the perspective of long-term stress, it affects the long-term life of the extrusion tool. 3. In the existing literature, the reverse extrusion head cover is connected to the mold through an open mold hole. When encountering an alloy type with a relatively soft and sticky alloy composition, the mold may be stuck to the residual pressure at the tail of the aluminum ingot and pulled out, and cannot be easily separated. The operator has increased the workload of separating the mold and the residual pressure, which is labor-intensive and time-consuming. Summary of the invention

[0005] The purpose of the utility model is to provide a quick positioning locking device specially used for fixing a reverse extrusion die assembly, and a connecting sleeve is arranged to connect and fix the hollow die shaft and the die assembly, so that continuous extrusion production can be realized without periodic loading and unloading of the die, and the conventional reverse extrusion conventional loading and unloading die mechanical arm is omitted, and the equipment installation cost is saved, so that the reverse extrusion production efficiency is greatly improved, and the production efficiency and compact continuity are increased; moreover, each extrusion tool is mutually fastened and connected, the connection is stable and reliable, the installation is convenient, and the efficiency of replacing the die is improved.

[0006] In order to achieve the above object, the technical solution of the utility model is as follows:

[0007] A quick positioning locking device specially used for fixing a reverse extrusion die assembly, wherein a plurality of locking protrusions A are arranged on the front circumferential outer wall of a hollow die shaft, and locking splines B of matching number and shape are arranged on the corresponding inner wall of the rear end of a connecting sleeve; the die assembly is installed in the front inner cavity of the connecting sleeve.

[0008] The connection method is changed from the hollow mold shaft middle plug-in locking shown in the existing literature to the hollow mold shaft outer edge sleeve locking shown in this patent. The supporting and fixing structure is more scientific and reasonable, which can effectively prevent the deformation of the steel in the connection part due to the excessive weight of the mold.

[0009] The locking spline A is divided into a locking part and a stop part. The rear edge of the locking part is pressed and interlocked with the front edge of the locking spline B, and the stop part is pressed against the side edge of the locking spline B. When the connecting sleeve is rotated and locked, the locking spline B reaches the locking position and presses against the stop part to automatically complete the positioning, without the need for manual verification of the rotation in place, thereby improving the accuracy of locking.

[0010] A positioning pin groove is arranged at the intersection of the locking part and the stop part, and a locking pin hole is arranged at the matching position of the rear end side wall of the connecting sleeve. When the locking spline B reaches the locking position and is automatically positioned against the stop part, the position of the positioning pin groove of the locking spline A matches the position of the anti-rotation screw hole on the connecting sleeve. The anti-rotation screw hole is a countersunk hole. When the connecting sleeve is installed and locked, the anti-rotation bolt can be screwed in, and the bolt head can abut against the locking spline A to prevent the connecting sleeve from rotating and loosening by itself, thus playing a safety role.

[0011] The front end top surface of the hollow mold shaft is provided with upper and lower positioning pin holes, and the rear end surface of the mold assembly is provided with matching positioning pin holes, and positioning pins A are inserted into the positioning pin holes to achieve positioning of the hollow mold shaft and the mold assembly.

[0012] The mold assembly includes a mold and a mold pad near the front end. The rear end face of the mold is provided with a plurality of positioning pin holes, and the rear end face of the mold pad is provided with matching positioning pin holes. Positioning pins B are inserted into the positioning pin holes to achieve positioning of the mold and the mold pad.

[0013] A stop step is arranged at the front edge of the inner cavity of the connecting sleeve, and the shape of the stop step matches the front edge of the mold. The stop step is engaged and positioned with the front edge of the mold.

[0014] The installation and use method of the utility model comprises the following steps:

[0015] (1) Assemble the mold and the mold pad by positioning pin B to obtain a mold assembly;

[0016] (2) Assemble the mold assembly and the hollow mold shaft using positioning pin A;

[0017] (3) Insert the connecting sleeve into place from the end face of the mold;

[0018] (4) Twist the connecting sleeve to lock the locking spline A and the locking spline B until the locking spline B reaches the locking position and presses against the stopper to automatically complete the positioning;

[0019] (5) Screw the anti-rotation bolt into the anti-rotation screw hole to complete the installation of the anti-extrusion tool assembly;

[0020] (6) After the extrusion is completed, the extrusion tool is removed in the order of step (5) to step (1).

[0021] Utility Model Advantages

[0022] 1. The utility model adds a connecting sleeve at the front end of the die shaft to directly connect and fix the extrusion die shaft and the die, which changes the current situation that the traditional aluminum alloy reverse extrusion die shaft and the die are separated, optimizes the work flow of aluminum alloy reverse extrusion, and greatly improves the reverse extrusion production efficiency. There is no need to periodically load and unload the die, which reduces the transfer work of the die for each extrusion, reduces useless work, improves production efficiency and production continuity, and makes the production rhythm more compact.

[0023] 2. The utility model adopts a connecting sleeve to connect with the hollow mold shaft, and the mold is also firmly wrapped and fixed in the connecting sleeve. During the extrusion process, the mold is always wrapped and fixed in the connecting sleeve, and the mold will not be pressed and adhered, thereby improving the extrusion production efficiency.

[0024] 3. Since the locking spline A is provided with a stopper, during the locking operation, the connecting sleeve stops automatically after being screwed into place, and then a fixing pin is inserted into the pin hole. There is no need to manually check the locking position, and the locking effect of the connecting sleeve is guaranteed, and it is not easy to shift during the extrusion process.

[0025] 4. Each component in the extrusion tool is connected to the adjacent components by a positioning and locking mechanism to form an overall interconnected locking structure, which greatly improves the stability of the extrusion tool. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the combined structure of the utility model;

[0027] Figure 2 This is a schematic diagram of the appearance structure of the hollow mold shaft;

[0028] Figure 3 It is a schematic diagram of the side view structure of the hollow mold shaft;

[0029] Figure 4 for Figure 3 Schematic diagram of the structure in the middle A direction;

[0030] Figure 5 for Figure 3 Schematic diagram of the structure in the middle B direction;

[0031] Figure 6 It is a schematic diagram of the appearance structure of the connecting sleeve;

[0032] Figure 7 This is a schematic diagram of the appearance structure of the connecting sleeve from another perspective;

[0033] Figure 8 It is a schematic diagram of the side structure of the connecting sleeve;

[0034] The serial numbers and component names in the figure are: 1-hollow mold shaft; 11-locking spline A; 111-locking part; 112-stop part; 2-connecting sleeve; 21-locking spline B; 22-anti-rotation screw hole; 24-stop step; 3-mold pad; 4-mold; 5-locating pin A; 6-locating pin B. DETAILED DESCRIPTION

[0035] Example 1

[0036] A quick positioning and locking device specially used for fixing a reverse extrusion die assembly, wherein three locking splines A11 are evenly distributed on the front circumferential outer wall of a hollow die shaft 1, and three locking splines B21 of matching shapes are arranged on the corresponding rear end inner wall of a connecting sleeve 2; the die assembly is installed in the front inner cavity of the connecting sleeve 2.

[0037] The locking spline A11 is divided into a locking portion 111 and a stop portion 112. The rear edge of the locking portion 111 is pressed and interlocked with the front edge of the locking spline B21, and the stop portion 112 is pressed and stopped with the side edge of the locking spline B21.

[0038] A positioning pin groove is provided at the intersection of the locking portion 111 and the stop portion 112 , and an anti-rotation screw hole 22 is provided at a matching position on the rear end side wall of the connecting sleeve 2 .

[0039] The front end top surface of the hollow mold shaft 1 is provided with upper and lower positioning pin holes, and the rear end surface of the mold assembly is provided with matching positioning pin holes, and positioning pins A5 are inserted into the positioning pin holes to achieve positioning of the hollow mold shaft 1 and the mold assembly.

[0040] The mold assembly includes a mold 4 and a mold pad 3 near the front end. The rear end face of the mold 4 is provided with a plurality of positioning pin holes, and the rear end face of the mold pad 3 is provided with matching positioning pin holes. Positioning pins B6 are inserted into the positioning pin holes to achieve positioning of the mold 4 and the mold pad 3.

[0041] A stop step 24 is provided at the front edge of the inner cavity of the connecting sleeve 2 , and the shape of the stop step 24 matches the front edge of the mold 4 .

Claims

1. A quick positioning and locking device specially used for fixing a reverse extrusion die assembly, characterized in that: A plurality of locking splines A (11) are arranged on the front circumferential outer wall of the hollow mold shaft (1), and locking splines B (21) of matching number and shape are arranged on the corresponding connecting rear end inner wall of the connecting sleeve (2); and the mold assembly is installed in the front inner cavity of the connecting sleeve (2).

2. The quick positioning and locking device for fixing the reverse extrusion die assembly according to claim 1, characterized in that: The locking spline A (11) is divided into a locking portion (111) and a stop portion (112); the rear edge of the locking portion (111) is pressed and interlocked with the front edge of the locking spline B (21); and the stop portion (112) is pressed and stopped with the side edge of the locking spline B (21).

3. The quick positioning and locking device for fixing the reverse extrusion die assembly according to claim 2, characterized in that: A positioning pin groove is provided at the intersection of the locking portion (111) and the stop portion (112), and an anti-rotation screw hole (22) is provided at a matching position on the rear end side wall of the connecting sleeve (2).

4. The quick positioning and locking device for fixing the reverse extrusion die assembly according to claim 1 is characterized in that: The front end top surface of the hollow mold shaft (1) is provided with upper and lower positioning pin holes, and the rear end surface of the mold assembly is provided with matching positioning pin holes, and positioning pins A (5) are inserted into the positioning pin holes to achieve positioning of the hollow mold shaft (1) and the mold assembly.

5. The quick positioning and locking device for fixing the reverse extrusion die assembly according to claim 1, characterized in that: The mold assembly comprises a mold (4) and a mold pad (3) at the front end, a plurality of positioning pin holes are arranged on the rear end face of the mold (4), and matching positioning pin holes are arranged on the rear end face of the mold pad (3), and positioning pins B (6) are inserted into the positioning pin holes to achieve positioning of the mold (4) and the mold pad (3).

6. The quick positioning and locking device for fixing the reverse extrusion die assembly according to claim 1, characterized in that: A stop step (24) is provided at the front edge of the inner cavity of the connecting sleeve (2), and the shape of the stop step (24) matches the front edge of the mold (4).

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