A method for trial-producing model workpieces

Abstract

The present invention provides a method for trial-producing a model workpiece, which comprises the following steps: selecting a clamping angle capable of machining the most workpiece body structures in one clamping, and defining a clamping positive direction according to the clamping angle; setting an auxiliary clamping structure adapted to the clamping positive direction on the workpiece; clamping a workpiece blank according to the determined clamping positive direction, and preliminarily machining a workpiece body framework and the set auxiliary clamping structure on the workpiece; defining a machining process for the workpiece body structure; machining the workpiece body structure on the workpiece body framework according to the machining process; and cutting off the auxiliary clamping structure to obtain a target model workpiece. The method for manufacturing the model workpiece of the present invention breaks the conventional fixed pattern of machining workpieces by multiple clamps, solves the problem that complex curved surface model workpieces must rely on machining brackets, and can effectively save material costs and machining man-hours.

Description

Technical Field

[0001] The present invention belongs to the technical field of vehicle model trial production, and particularly relates to a method for trial-producing model workpieces. Background Art

[0002] During the trial production and processing of automotive master models, the shapes of workpieces are usually irregular. It is necessary to formulate corresponding clamping schemes according to the size and shape characteristics of the workpieces to ensure the processing quality and efficiency of the workpieces. For some large workpieces, flexible zero-position jigs can be used for multi-point matching to achieve clamping. For some small and medium-sized workpieces, such as parts with large curvature changes like grilles and decorative strips, in order to ensure the processing accuracy and stability, it is not recommended to use plaster frames or adhesive fixation. Usually, it is necessary to design and process a processing bracket one by one. The workpiece is positioned and locked to the processing bracket through positioning pins and bolts, and then the bracket is clamped. This clamping scheme has good processing effects, but it increases the working hours and raw material cost expenditures for design and processing. The clamping method of designing and processing a milling bracket one by one, since there is usually only one copy of the trial-produced model workpiece, the bracket can only be scrapped after use, increasing the processing cost. Moreover, designing and processing the bracket separately increases the extra working hours and has poor economy.

[0003] On the premise of ensuring the processing effect, how to improve the processing efficiency and reduce the production cost is a difficult problem. Trying to cancel the processing bracket and seek an alternative solution is a possible direction. Usually, for the purpose of saving processing working hours and reducing costs, it can be considered to combine the processing brackets of similar workpieces, which can not only save the processing quantity and blank materials of the brackets, but also save a small amount of the processing working hours of the workpieces. As Figure 1 shown, 6 decorative strips are combined and designed into a processing bracket C10. Compared with separately processing 6 processing brackets and separately processing the workpieces 6 times, it is expected to save half of the blank materials and processing working hours of the brackets. Sharing a processing bracket for similar workpieces can save the bracket material cost and processing working hours to a certain extent, but still requires a processing bracket, and the problem of high material and working hour costs has not been fundamentally solved. Summary of the Invention

[0004] In view of the above problems, the present invention provides a method for trial-producing model workpieces, which sets the optimal clamping positive direction before processing, so that all key structures of the workpiece can be completely processed under one clamping, and then the processing bracket is cancelled, thereby providing a brand-new workpiece processing solution that does not rely on the processing bracket and has high quality and low cost. The object of the present invention is achieved through the following technical solutions:

[0005] The present invention provides a method for trial-producing model workpieces, which includes the following steps:

[0006] Step S1: Select a clamping angle that can machine the most workpiece body structures in one clamping, and define the clamping positive direction based on the clamping angle;

[0007] Step S2: Set an auxiliary clamping structure on the workpiece that adapts to the clamping positive direction;

[0008] Step S3: Clamp the workpiece blank according to the clamping positive direction determined in Step S1, and preliminarily machine the workpiece body frame and the auxiliary clamping structure set in Step S2 on the workpiece;

[0009] Step S4: Define the processing procedures for the workpiece body structure;

[0010] Step S5: Machine the workpiece body structure on the workpiece body frame obtained in Step S3 according to the processing procedures defined in Step S4;

[0011] Step S6: Cut off the auxiliary clamping structure to obtain the target model workpiece.

[0012] Furthermore, the auxiliary clamping structure includes a reinforcing rib and a standard clamping base, and the reinforcing rib is connected between the standard clamping base and the workpiece body.

[0013] Furthermore, the workpiece body has a Strak surface and a matching structure surface. The matching structure surface is provided with a positioning structure and a locking structure. Here, the Strak surface mainly refers to the exposed surface or surface in the process of vehicle model development, and the matching structure surface mainly refers to the surface where the model workpiece is assembled and matched with other vehicle structures in the process of vehicle model development.

[0014] Furthermore, in Step S1, when determining the clamping angle, the first basis is that both the Strak surface and the matching structure surface of the workpiece body are in a visible state.

[0015] Furthermore, in Step S5, the Strak surface and the matching structure surface are completely machined by five-axis swing angle.

[0016] Furthermore, the processing procedures include the Strak surface processing, positioning structure processing, locking structure processing, and non-functional structure processing procedures set in the order of priority.

[0017] Furthermore, the processing procedures defined in Step S4 also include a stress relief procedure.

[0018] Furthermore, if all the workpiece body structures cannot be machined according to the clamping positive direction selected in Step S1, then when defining the processing procedures for the workpiece body structure in Step S4, the processing of the positioning structure is set as a surface positioning structure, and the locking structure is set as a magnetic adsorption type locking structure.

[0019] Furthermore, the present invention also provides a standard clamping fixture, which is adapted to the standard clamping base and is detachably connected to a five-axis swing-angle machining device for clamping various workpieces.

[0020] The beneficial effects of the present invention are as follows:

[0021] (1) The method for manufacturing the model workpiece of the present invention breaks the conventional pattern of machining workpieces by clamping twice or multiple times, and at the same time solves the problem that complex curved surface model workpieces must rely on machining brackets, achieving the purpose of saving material costs and machining man-hours. The method of machining in one clamping and processing in place of the present invention has a wide range of application scenarios. In the field of trial production of automotive main models, it can be applied to the grille of exterior models, various decorative strips, small and medium-sized parts on the instrument panel, sub-board, and door panel of interior models.

[0022] (2) In terms of process, by planning the machining process steps, first machining the Strak surface and positioning structure, and setting machining protection for other structures, thus ensuring the machining stability and accuracy of important positions, and then machining other structures in gradients. Compared with the solution using a machining bracket, the method of machining in one clamping and processing in place has significant advantages in terms of cost and man-hours, saving about half of the material cost and about 20%-30% of the machining man-hours. At the same time, it can fully ensure the machining quality of the exposed Strak surface and the matching structure surface that affects the workpiece accuracy, and proposes a surface positioning / magnet assembly solution to replace the traditional positioning pin / bolt, thereby ensuring that most small and medium-sized trial production model workpieces are applicable to the present invention.

[0023] (3) When the workpiece cannot keep all the structures to be machined visible in one clamping, a form of surface positioning plus magnet is used to replace the traditional positioning and locking method of positioning pin plus bolt, realizing the simplification of the matching structure surface, so as to achieve complete machining in one clamping. Description of the Drawings

[0024] Figure 1 Shown is a schematic diagram of a machining bracket in the prior art;

[0025] Figure 2a Shown is a schematic diagram of the first machining state of a workpiece in the prior art;

[0026] Figure 2b Shown is a schematic diagram of the machining bracket when the workpiece is machined for the second time in the prior art;

[0027] Figure 3a Shown is a schematic diagram of the preliminary machining of the model workpiece in Embodiment 1 of the present invention;

[0028] Figure 3b Shown is a schematic diagram of the further machining of the model workpiece in Embodiment 1 of the present invention;

[0029] Figure 3c The following is a schematic diagram of the model workpiece according to Embodiment 1 of the present invention;

[0030] Figure 4 As shown Figure 3c a schematic diagram of the model workpiece from another perspective;

[0031] Figure 5 The following is a schematic diagram of the model workpiece according to Embodiment 2 of the present invention;

[0032] Figure 6 The following is a schematic diagram of the model workpiece according to Embodiment 3 of the present invention clamped in a standard clamping fixture. Specific Embodiments

[0033] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings.

[0034] It should be noted that in the following description, the orientation or positional relationship indicated by the terms "upper", "lower", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is 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 thus should not be construed as a limitation of the present invention. In addition, in the description of the present invention, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0035] In the prior art, usually, the automotive master model workpiece needs to be clamped and processed two or more times. Generally, for the first clamping, a zero-positioning tooling is used to process the back matching structure surface. As Figure 1 shown, the matching structure surface A11 is preliminarily processed from the workpiece blank P1, and then for the second clamping, it is flipped 180° and the matching structure surface A11 of the workpiece is clamped by the processing bracket C11 to process the exposed Strak surface of the workpiece A10. However, for the second clamping, due to the large curvature change or complex structure of the workpiece back, it is necessary to separately manufacture a processing bracket C11 adapted to the matching structure surface A11 of the workpiece. In view of this, the present invention provides a method for trial-producing a model workpiece, which enables all key structures on the model workpiece to be processed through one clamping and processing.

[0036] Embodiment 1:

[0037] This embodiment provides a method for trial-producing a model workpiece. When processing the model workpiece by this method, it can be realized that all key structures of the workpiece body can be completely processed during one clamping of the workpiece, so that there is no need to additionally process a bracket. The key point of processing the model workpiece by this method is to fully reflect the exposed Strak surface and the matching structure under a limited perspective and ensure the clamping stability. The method of this embodiment includes the following steps:

[0038] Step S1: Select a clamping angle that can machine the most workpiece body structures in one clamping, and define the clamping positive direction based on the clamping angle; Usually, when choosing the clamping positive direction, it is necessary to ensure that both the Strak surface 120 and the mating structure surface 110 of the workpiece body are visible. When the workpiece body structure is not particularly complex, the clamping positive direction is generally set to be about 90° flipped from the normal direction of the Strak surface; When it comes to the preparation of more complex workpiece bodies, software simulation analysis can also be used to determine the most suitable direction;

[0039] Step S2: Set an auxiliary clamping structure 200 on the workpiece that adapts to the clamping positive direction. The auxiliary clamping structure 200 includes a reinforcing rib 220 and a standard clamping base 210. The reinforcing rib 220 is connected between the standard clamping base 210 and the workpiece body 100, forming a machining space between the workpiece body and the clamping base to facilitate the machining of the bottom structure of the workpiece body; Since the workpiece needs to be completely machined in one clamping, the arrangement position of the reinforcing rib 220 is usually at the bottom of the clamping positive direction of the workpiece, which is convenient for trimming after machining. The design key points of the reinforcing rib are to evenly arrange a square reinforcing structure with a length generally of 20 - 100 mm, a thickness of 5 - 20 mm, and a height of 10 - 50 mm according to the size and shape of the workpiece, as Figure 4 shown. Through such a design, the Strak surface 120 and the mating structure surface 110 are effectively avoided, facilitating later programming trimming or manual trimming; Supplement and strengthen local sharp points or thin points of the workpiece to prevent local vibration;

[0040] Step S3: Clamp the workpiece blank according to the clamping positive direction determined in Step S1, and preliminarily machine the frame of the workpiece body 100 and the auxiliary clamping structure 200 set in Step S2 on the workpiece blank P2, as Figure 3a shown;

[0041] Step S4: Define the machining process for the workpiece body structure. The machining process includes processes for machining the Strak surface, the positioning structure 112, the locking structure 111, and other various non-functional structures set in the order of priority;

[0042] Step S5: Completely machine the Strak surface 120 and the mating structure surface 110, as well as all other workpiece body structures that can be machined, on the workpiece body frame obtained in Step S3 through a five-axis swing angle according to the machining process defined in Step S4, as Figure 3b and Figure 3cAs shown in the figure, a positioning structure and a locking structure are provided on the matching structural plane 110; during specific processing, first, the structures outside the Strak surface are protected. Taking the workpiece in the illustrated embodiment as the target workpiece, rough machining, semi-finishing, and finishing of the Strak surface are completed integrally to ensure the machining quality of the Strak surface to the greatest extent;

[0043] Step S6: Cut off the auxiliary clamping structure 200 to obtain the target model workpiece.

[0044] In a preferred embodiment, the machining process defined in step S4 further includes a stress relief process. Since the workpiece is only clamped once, stress needs to be released during the machining process. According to the material selection and structure of the workpiece, the allowance settings for rough machining and semi-finishing are defined. If the material is aluminum alloy or high-density material, after rough machining is completed, it is left standing for 4h - 24h according to the workpiece size.

[0045] Embodiment 2:

[0046] The basic principle of this embodiment is the same as that of Embodiment 1. The difference is that in this embodiment, considering that for workpieces with particularly complex structures, if all the workpiece body structures cannot be machined according to the clamping positive direction selected in step S1, then when defining the machining process for the workpiece body structure in step S4, the machining of the positioning structure is set as the profile positioning structure 112', and the locking structure is set as the magnetic adsorption type locking structure 111'.

[0047] Specifically, when some workpieces are restricted by the structure and cannot achieve complete machining of the Strak surface and the matching structural plane in one clamping, an alternative matching connection method can be considered to machine the specific structure of the matching structural plane to solve the situation where the positioning structure (such as a positioning hole), the locking structure (such as a locking hole), and the matching surface cannot be machined in place on the premise that the machining of the Strak surface must be ensured in place, so as to still complete the machining of the workpiece in one clamping; in the machining of the workpiece in the illustrated embodiment, if the normal direction of the matching surface is selected as the clamping direction, the positioning structure is changed from the traditional positioning pin to the profile positioning 112', and the position of the workpiece is adjusted by adding or subtracting the gaskets of the X / Y / Z positioning profile. The locking structure 111 is changed from a bolt to a magnetic adsorption type locking structure 111'. Devices such as magnets of the magnetic adsorption type locking structure can be post-fitted by a manual positioning tool. By simplifying the matching structural plane, the machining in the lateral machining perspective can be achieved in place.

[0048] Embodiment 3:

[0049] This embodiment provides a standard clamping fixture C20, and the standard clamping fixture is adapted to the standard clamping base, such as Figure 6As shown, when manufacturing any model workpiece using the methods of Embodiment 1 and Embodiment 2, the standard clamping base 210 in the auxiliary clamping structure 200 can be standardized and designed identically, enabling it to be fitted onto the same standard clamping fixture C20 for processing, enhancing the universality of the standard clamping fixture C20, and thus improving the efficiency and economy of model workpiece processing.

[0050] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention and are not restrictive. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in terms of form and details without departing from the scope defined by the claims of the present invention; the dimensions described in the drawings and embodiments have nothing to do with the specific physical objects and are not used to limit the protection scope of the present invention. The physical dimensions can be selected and changed according to actual needs.

Claims

1. A method for trial-producing a model workpiece, characterized in that, It includes the following steps: Step S1: Select a clamping angle that can machine the most structures of the workpiece body in one clamping, and define the clamping positive direction based on the clamping angle; the workpiece body has a Strak surface and a matching structure surface, and a positioning structure and a locking structure are provided on the matching structure surface; when determining the clamping angle, the first basis is that both the Strak surface and the matching structure surface of the workpiece body are in a visible state; Step S2: Set an auxiliary clamping structure adapted to the clamping positive direction on the workpiece. The auxiliary clamping structure includes a reinforcing rib and a standard clamping base; the reinforcing rib is connected between the standard clamping base and the workpiece body and is arranged at the bottom in the clamping positive direction of the workpiece, so that a machining space is formed between the workpiece body and the clamping base; Step S3: Clamp the workpiece blank according to the clamping positive direction determined in Step S1, and preliminarily machine the workpiece body frame and the auxiliary clamping structure set in Step S2 on the workpiece; Step S4: Define the machining process for the workpiece body structure; Step S5: Machine the workpiece body structure on the workpiece body frame obtained in Step S3 according to the machining process defined in Step S4; Step S6: Cut off the auxiliary clamping structure to obtain the target model workpiece.

2. The method for trial-producing a model workpiece according to claim 1, characterized in that In Step S5, the Strak surface and the matching structure surface are machined completely by five-axis swing angle.

3. A method for trial-producing a model workpiece according to claim 1, characterized in that, The machining process includes a Strak surface machining, a positioning structure machining, a locking structure machining, and a non-functional structure machining process set in the order of priority.

4. A method for trial-producing a model workpiece according to claim 3, characterized in that, The machining process defined in Step S4 also includes a stress relief process.

5. A method for trial-producing a model workpiece according to any one of claims 1 to 4, characterized in that If all the workpiece body structures cannot be machined according to the clamping positive direction selected in Step S1, then when defining the machining process for the workpiece body structure in Step S4, the machining of the positioning structure is set as a profiled surface positioning structure, and the locking structure is set as a magnetic adsorption type locking structure.

6. A method for trial - producing a model workpiece according to any one of claims 1 to 4, characterized in that, Provide a standard clamping fixture, which is adapted to the standard clamping base.

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